Updated on 2022/05/28

写真a

 
KOJIMA Hiroki
 
Organization
Graduate School of Engineering Electrical Engineering 1 Associate professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Electrical Engineering, Electronics, and Information Engineering
Title
Associate professor
Contact information
メールアドレス
External link

Degree 3

  1. Dr. of Engineering ( 2004.3   Nagoya University ) 

  2. Master of Engineering ( 2000.3   Nagoya University ) 

  3. Bachelor of Engineering ( 1998.3   Nagoya University ) 

Research Interests 4

  1. Breakdown

  2. Discharge

  3. Electrical insulation

  4. High voltage

Research Areas 1

  1. Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Power engineering

Current Research Project and SDGs 3

  1. 環境に調和した次世代電力機器に関する研究

  2. 超電導電力機器・システムに関する研究

  3. 高柔軟な電気エネルギーシステム・設備のマネジメント技術に関する研究

Research History 5

  1. Nagoya University   Graduate School of Engineering   Associate professor

    2014.4

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    Country:Japan

  2. Nagoya University   EcoTopia Science Institute   Endowed chair associate professor

    2010.4 - 2014.3

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    Country:Japan

  3. Nagoya University   EcoTopia Science Institute   Endowed chair assistant professor

    2007.4 - 2010.3

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    Country:Japan

  4. Nagoya University   EcoTopia Science Institute   Assistant

    2005.4 - 2007.3

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    Country:Japan

  5. Nagoya University   EcoTopia Science Institute   Assistant

    2004.4 - 2005.3

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    Country:Japan

Education 3

  1. Nagoya University   Graduate School of Engineering   Department of Energy Engineering and Science

    2000.4 - 2004.3

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    Country: Japan

  2. Nagoya University   Graduate School of Engineering   Department of Energy Engineering and Science

    1998.4 - 2000.3

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    Country: Japan

  3. Nagoya University   School of Engineering   Department of Electrical Engineering

    1994.4 - 1998.3

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    Country: Japan

Committee Memberships 61

  1. 電気学会放電・プラズマ・パルスパワー技術委員会   委員長  

    2022.6 - 2025.3   

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    Committee type:Academic society

  2. 令和5年電気学会全国大会実行委員会   幹事  

    2022.6 - 2023.6   

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    Committee type:Academic society

  3. 電気学会放電・プラズマ・パルスパワー技術委員会   副委員長  

    2022.4 - 2022.5   

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    Committee type:Academic society

  4. 経済産業省産業構造審議会   臨時委員  

    2021.7 - 2023.7   

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    Committee type:Government

    保安・消費生活用製品安全分科会電力安全小委員会電気設備自然災害等対策WG

  5. 電気学会 論文委員会(A2グループ)   委員  

    2021.4   

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    Committee type:Academic society

  6. 電気学会高電圧技術委員会   1号委員  

    2021.4 - 2024.3   

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    Committee type:Academic society

  7. CMD2022組織委員会   委員  

    2021.4 - 2023.3   

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    Committee type:Academic society

  8. ISDEIV2023現地実行委員会   委員  

    2021.3 - 2023.12   

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    Committee type:Academic society

  9. 電気協同研究会 架空送電設備の絶縁設計調査専門委員会   専門委員  

    2020.10 - 2023.9   

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    Committee type:Academic society

  10. 電気学会ガス絶縁開閉装置の環境負荷低減への技術動向調査専門委員会   委員  

    2020.10 - 2023.3   

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    Committee type:Academic society

  11. 電気学会 絶縁協調標準特別委員会   委員  

    2019.11 - 2022.10   

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    Committee type:Academic society

  12. 電気学会 変圧器・リアクトルの騒音対策に関する最新動向調査専門委員会   委員  

    2019.10 - 2022.9   

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    Committee type:Academic society

  13. パワーアカデミー大学検討委員会 若手教員/研究者支援WG   主査  

    2018.4   

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    Committee type:Academic society

  14. 公益財団法人名古屋産業科学研究所   非常勤所員  

    2017.9 - 2025.3   

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    Committee type:Other

  15. 電気学会 変圧器の機能・性能の多様化に関する最新動向調査専門委員会   委員  

    2016.10 - 2019.9   

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    Committee type:Academic society

  16. CIGRE SC C4 国内分科会   委員  

    2014.1   

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    Committee type:Academic society

  17. 電気学会 論文委員会(A2グループ)   主査  

    2020.4 - 2021.3   

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    Committee type:Academic society

  18. 電気学会 基礎・材料・共通部門編修委員会   委員  

    2020.4 - 2021.3   

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    Committee type:Academic society

  19. ISDEIV2022現地実行委員会   委員  

    2020.3 - 2022.12   

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    Committee type:Academic society

  20. 電気学会放電・プラズマ・パルスパワー技術委員会   幹事  

    2019.1 - 2022.3   

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    Committee type:Academic society

  21. 第50回電気電子絶縁材料システムシンポジウム現地実行委員会   委員  

    2019   

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    Committee type:Academic society

  22. ICEPE-ST2019 現地実行委員会(LOC)   委員  

    2018.1 - 2019.12   

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    Committee type:Academic society

  23. NEDO研究評価委員会「次世代洋上直流送電システム開発事業」分科会   NEDO技術委員  

    2017.5 - 2019.3   

  24. 電気学会 ガス絶縁開閉装置(GIS)に関連する最新規格と今後の技術動向調査専門委員会   委員  

    2017.4 - 2019.3   

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    Committee type:Academic society

  25. 電気学会 編修専門第1部会   委員  

    2016.4 - 2019.3   

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    Committee type:Academic society

  26. 電気学会 高電圧電気絶縁技術の歴史調査専門委員会   幹事  

    2016.4 - 2018.3   

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    Committee type:Academic society

  27. Organizing committee of IWHV & JK 2016   Member  

    2016   

  28. GD2016組織委員会   委員  

    2015.10 - 2017.3   

  29. GD2016実行委員会   幹事  

    2015.10 - 2017.3   

  30. GD2016現地委員会   幹事  

    2015.10 - 2017.3   

  31. 電気学会 論文委員会(A2グループ)   幹事  

    2015.4 - 2020.3   

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    Committee type:Academic society

  32. Steering Committee of 2015 KJ Joint Symposium on ED & HVE   member  

    2015   

  33. 電気学会 変圧器国内外規格の動向と比較調査専門委員会   委員  

    2014.10 - 2016.9   

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    Committee type:Academic society

  34. 平成27年電気学会電力・エネルギー部門大会実行委員会   幹事  

    2014.10 - 2015.9   

  35. 電気学会 ガス絶縁開閉装置(GIS)標準特別委員会   委員  

    2014.8 - 2016.7   

  36. 電気学会 次世代電力システムに向けたガス絶縁開閉装置へ要求される技術動向調査専門委員会   委員  

    2014.4 - 2016.9   

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    Committee type:Academic society

  37. 電気学会広報委員会   委員  

    2013.5 - 2014.5   

  38. 電気学会創立125周年記念事業委員会   委員  

    2013.5 - 2014.5   

  39. 平成25年度電気関係学会東海支部連合大会実行委員会   幹事  

    2013.4 - 2014.1   

  40. 平成25年度電気関係学会東海支部連合大会プログラム編集委員会   幹事  

    2013.4 - 2013.9   

  41. 平成25年度電気関係学会東海支部連合大会大会委員会   庶務幹事  

    2013.3 - 2014.2   

  42. 電気学会絶縁性液体の電気的・化学的挙動と製品適用技術調査専門委員会   委員  

    2012.10 - 2015.9   

  43. 電気学会変圧器解析における高度利用技術調査専門委員会   委員  

    2012.10 - 2014.9   

  44. 電気学会静止器技術委員会   1号委員  

    2012.7 - 2020.3   

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    Committee type:Academic society

  45. 電気学会放電技術委員会   幹事  

    2012.7 - 2018.12   

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    Committee type:Academic society

  46. 平成25年電気学会全国大会実行委員会   代表幹事  

    2012.6 - 2013.6   

  47. 平成25年電気学会全国大会小委員会   委員  

    2012.6 - 2013.6   

  48. 電気学会編修専門第3部会   委員  

    2012.5 - 2013.5   

  49. 電気学会創立125周年記念事業実行委員会   委員  

    2012.5 - 2013.5   

  50. 平成24年度電気関係学会東海支部連合大会実行委員会   委員  

    2012.4 - 2013.1   

  51. 平成24年度電気関係学会東海支部連合大会プログラム編集委員会   委員  

    2012.4 - 2012.9   

  52. ICEPE2013 現地実行委員会(LOC)   委員  

    2012.3 - 2014.3   

  53. 電気学会高経年GISに要求される適用技術の動向調査専門委員会   委員  

    2012.1 - 2013.12   

  54. パワーアカデミー大学検討委員会 若手教員/研究者支援WG   エリア代表幹事  

    2011.10 - 2018.3   

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    Committee type:Academic society

  55.   Member  

    2010.10 - 2012.9   

  56. イットリウム系超電導電力機器技術開発プロジェクトSMES試験法検討小委員会   委員  

    2010.6 - 2012.3   

  57. イットリウム系超電導電力機器技術開発プロジェクトSMESコイル検討小委員会   委員  

    2010.6 - 2011.3   

  58.   Member  

    2010.6 - 2010.9   

  59. CMD2010組織委員会   幹事補  

    2010.4 - 2011.2   

  60.   Assistant Secretary  

    2009.5 - 2012.4   

  61. CMD2010総務委員会   委員  

    2009.1 - 2011.2   

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Awards 5

  1. Best Paper Award CMD 2020

    2020.10   8th International Conference on Condition Monitoring and Diagnosis   Diagnosis of Discharge Pattern in Vacuum Interrupter by Shield Potential Measurement

    H. Kojima, T. Donen, T. Kimura, N. Hayakawa

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    Award type:Award from international society, conference, symposium, etc.  Country:Thailand

  2. パワーアカデミー萌芽研究優秀賞

    2019.3   パワーアカデミー   ガス絶縁開閉装置の絶縁診断高度化に向けた部分放電の電磁波放射メカニズムの解明

    小島寛樹

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

  3. IEEJ Distinguished Paper Award

    2018.5   The Institute of Electrical Engineers of Japan   Improvement Mechanism of AC Breakdown Voltage of Insulating Oil with Dispersed Nanoparticles

    H. Kojima, T. Kondo, M. Hanai, N. Hayakawa

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  4. IEEJ Distinguished Paper Award

    2012.5   The Institute of Electrical Engineers of Japan   Mechanism of Small Current Generation under Impulse Voltage Applications in Vacuum

    K. Aoki, H. Yasukawa, H. Kojima, M. Homma, T. Shioiri, H. Okubo

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  5. 電気学会論文発表賞(賞A)

    2007.9   電気学会   N#D2#DRO混合ガスによる絶縁特性のシナジズム効果

    小島寛樹

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

    「N2O混合ガスによる絶縁特性のシナジズム効果」(平成18年電気学会電力・エネルギー部門大会)に対する受賞

 

Papers 112

  1. Volume Effect of Dynamic Breakdown Strength in Liquid Nitrogen under Transient Bubble Disturbance for Resistive Superconducting Fault Current Limiters Reviewed International journal

    N. Hayakawa, Y. Mori, H. Kojima

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 29 ( 1 ) page: 264 - 269   2022.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    Liquid nitrogen (LN2) is indispensable as the cooling and electrical insulating materials for high temperature superconducting (HTS) power apparatus. Especially for the resistive superconducting fault current limiters (RSFCL), a transient bubble disturbance in LN2 is generated due to the quench of HTS materials, which may induce an electrical breakdown in LN2 even under the rated voltage of RSFCL. We have been investigating not only the intrinsic breakdown characteristics of LN2 under the steady-state operation but also the dynamic breakdown characteristics of LN2 under the fault current limiting operation of RSFCL. In this paper, we investigate the heat flux and pressure dependence of the quench-induced dynamic breakdown characteristics of LN2 by using an actual HTS conductor and a pancake coil model for RSFCL. In addition, the dynamic breakdown strength is discussed and systematized in terms of the volume effect of breakdown strength in LN2. A flowchart to estimate the intrinsic and dynamic breakdown strength in LN2 is proposed toward the reliable and rational insulation design of RSFCL.

    DOI: 10.1109/TDEI.2022.3146564

    Web of Science

    Scopus

  2. Melting and Generation of Micro-protrusions on Cathode Surface during Spark Conditioning Process in Vacuum Reviewed International journal

    N. Kita, F. Kondo, H. Kojima, N. Hayakawa, H. Fukuda, K. Yamamura

    IEEE Transactions on Dielectrics and Electrical Insulation     2022

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    DOI: 10.1109/TDEI.2022.3173493

  3. Breakdown Characteristics of Cone-type ε-FGM Spacer for Gas Insulated Switchgears Invited Reviewed

    Y. Miyazaki, H. Kojima, H. Masui, H. Mitsudome, H. Yanase, K. Okamoto, K. Watanabe, K. Kato, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 141 ( 10 ) page: 546 - 551   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electrical Engineers of Japan  

    <p>Gas insulated switchgears (GIS) are required to be downsized for the cost reduction, global warming mitigation and energy saving. For the downsizing of GIS, a novel electric field grading technique is highly expected. In order to solve this problem, we have been investigating the electric field control and relaxation technique by “functionally graded materials (FGM)” with spatial distribution of permittivity (ε-FGM) and/or conductivity (σ-FGM). In our previous works, post-type and truncated cone-type ε-FGM spacers were fabricated by “flexible mixture casting method” (FMC method). Compared with the conventional spacers (Uniform spacer) with a uniform permittivity distribution, the electric field grading effects of those ε-FGM spacers were simulated based on Volume-Time theory and verified by the measurement of their breakdown voltages.</p><p>In this paper, toward the application of ε-FGM to the actual GIS spacer, i.e. 30% reduction of spacer diameter or 50% reduction of cross section, we fabricated the 1/4-sized cone-type ε-FGM spacer. By grading the mixing ratio of SrTiO<sub>3</sub> (ε<sub>r</sub>=332) and SiO<sub>2</sub> (ε<sub>r</sub>=4) fillers in epoxy resin, a cone-type spacer with the diameter of 60 mm was fabricated by FMC method. The breakdown voltage of the ε-FGM spacer was measured in a tank filled with SF<sub>6</sub> gas at 0.5 MPa-abs under the negative standard lightning impulse voltage by the step-up method. The maximum breakdown voltage of ε-FGM spacer was verified to be higher by 23% than the Uniform spacer with the same configuration and size of the ε-FGM spacer, which was also consistent with the simulated value.</p>

    DOI: 10.1541/ieejfms.141.546

    Scopus

    CiNii Research

  4. Alternative Test Method of Internal Arcing for Replacing SF6 by Air in SF6-Insulated Power Equipment Reviewed International journal

    M. Kotari, M. Iwata, H. Kojima, N. Hayakawa

    Engineering Research Express   Vol. 3 ( 3 ) page: 035005   2021.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing Ltd  

    To develop an alternative test method of internal arcing for replacing sulfur hexafluoride (SF6) by air in SF6-insulated power equipment, it is important for the public safety to clarify the thermal effect of hot SF6 and air from the equipment on the surroundings. In this study, an analytical model for evaluating the incident heat energy on a metal plate by exhausted hot gas was developed and validated. SF6-air mixtures with a range of gas thermodynamic and transport properties up to 30,000Kwere modelled using computational fluid dynamics (CFD) to simulate the increase in pressure. The analytical results are investigated using the experimental results on SF6-air mixtures. Subsequently, a method of setting the test conditions for the internal arc testing in SF6-insulated power equipment, is proposed based on the analytical model. Using the mixture model, assuming an alternative arcing test for replacing SF6 by air in the SF6-insulated power equipment, the method of setting a current or the duration of current is demonstrated and verified. The results indicate that the current and duration of current can be set such that the incident heat energy on the metal plate by exhausted hot gas are approximately equalized. This study could establish an alternative test method of internal arc in SF6-insulated power equipment.

    DOI: 10.1088/2631-8695/ac0fc2

    Scopus

  5. Dielectric Characteristics of Liquid Nitrogen/Synthetic Paper Composite Insulation System for Extra High Voltage HTS Cable Reviewed International journal

    N. Hayakawa, Y. Yamakami, T. Masuda, H. Kojima

    IEEE Transactions on Applied Superconductivity   Vol. 31 ( 5 ) page: 7700204   2021.8

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    For extra-high-voltage high-temperature superconducting (HTS) cables, not only high electrical insulation performance but also low dielectric loss is required. Therefore, we focus on a porous synthetic paper with lower dielectric loss, e.g., Tyvek polyethylene nonwoven fabric, than that of polypropylene laminated paper (PPLP), which has been used for a conventional HTS cable insulation system. In this paper, we compare partial discharge inception characteristics for different liquid nitrogen/synthetic paper composite insulation systems. The partial discharge inception electric field strength in the composite insulation system depends on the electric field strength in the porous area of synthetic paper.

    DOI: 10.1109/TASC.2021.3058204

    Web of Science

    Scopus

  6. Time Transition of Activated Conductivity Distribution in Air and Charge Accumulation in Air-solid Composite Insulation Systems under DC Partial Discharge Reviewed International journal

    R. Nakane, H. Kojima, N. Hayakawa

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 28 ( 3 ) page: 822 - 828   2021.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    DOI: 10.1109/TDEI.2021.009363

    Web of Science

  7. Development of Insulation System to Prevent Local Carbonization inside Stator Core of a Product Inverter-fed Motor Reviewed

    Y. Yoshitake, H. Kojima, Y. Kasai, S. Maruyama, H. Kojima, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 141 ( 4 ) page: 260 - 268   2021.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electrical Engineers of Japan  

    <p>A new phenomenon, called “local carbonization” inside a stator core was detected as a unique precursor to fragility of the insulation sheets of inverter-fed motors, and the conditions for generation of this carbonization were investigated. A separated stator of a product inverter-fed motor was manufactured, and an evaluation system for simulating a steep surge voltage was constructed. Electrically and mechanically, the results of a parameter survey of insulation system were used to compare the constructed separated stator and element model, and the comparison revealed a correlation between carbonization of the product separated stator and element model. From the consideration of carbonization mechanism, leakage current was revealed to be the dominant design factor. Through quantifying their threshold of carbonization occurrence, insulation system to prevent the carbonization in steeper inverter surge was developed by parameter survey using element model and validation test by separated stator.</p>

    DOI: 10.1541/ieejfms.141.260

    Scopus

    CiNii Research

  8. Electric Field Simulation of Permittivity and Conductivity Graded Materials (ε/σ-FGM) for HVDC GIS Spacers Reviewed International coauthorship International journal

    Rachmawati, H. Kojima, N. Hayakawa, K. Kato, N. Zebouchi

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 28 ( 2 ) page: 736 - 744   2021.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    This paper discusses the application of the novel technology - functionally graded material (FGM), which combines both spatial permittivity (ϵ) and conductivity (σ) distributions with the aim to control the electric field around DC-GIS spacer. Some distribution types of ϵ and/or σ in the spacer bulk, such as U-type and graded to higher conductivity (GHC) are investigated through electric field simulation, in comparison to the uniform spacer with constant ϵ and σ distributions. The electric field relaxation effect of each distribution type of ϵ/σ-FGM under DC steady state, DC polarity reversal, DC-on, and lightning impulse voltage superimposed on DC steady state condition are obtained. The results show that ϵ/σ-FGM with U-type permittivity and GHC-type conductivity distribution of which low σ is applied near the high voltage side of the DC-GIS spacer is the most effective in reducing the maximum electric field under all stated conditions.

    DOI: 10.1109/TDEI.2020.009343

    Web of Science

    Scopus

  9. Reshaping of Micro-morphology Feature in Electrode Surface under Conditioning by Lightning Impulse Voltage in Vacuum Gaps Reviewed International coauthorship International journal

    H. Ma, G. Li, Z. Liu, Y. Geng, J. Wang, H. Kojima

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 27 ( 6 ) page: 2056 - 2063   2020.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    The objective of this paper is to determine the reshaping of the micro-morphology feature in both the cathode and anode electrode surfaces after conditioning by lightning impulse voltage in vacuum gaps. Materials of the experimental rod-plane electrodes are Cu and stainless steel. The micro-morphology feature in the electrode surface is recorded by a 3D laser microscopy. Experimental results indicate that conditioning by the lightning impulse voltage reshaped the micro-morphology feature in both the cathode and anode electrode surfaces. The BD characteristics are closely related to the micro-morphology feature and roughness in the cathode surface after conditioning. Moreover, the conditioning process takes different effects in the cathode and anode surfaces. For cathode electrode, the main difference of the micro-morphology feature is in the distributing characteristics of the erosion regions. For anode electrode, there aree different patterns of the anodic conditioning mechanism of the micro-morphology feature. In the molten pattern, conditioning melted the anode surface and removed the micro-protrusions effectively. In the crater pattern, with the increasing BD voltage and energy, the material below the anode surface is heating, which is the cause of formation of the many craters in anode surface.

    DOI: 10.1109/TDEI.2020.008888

    Web of Science

    Scopus

  10. Partial Discharge Inception Voltage under Inverter Surge Voltage Considering Interactive Effects of Environmental Factors Reviewed

    T. Kaji, H. Asai, T. Nozu, H. Kojima, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 140 ( 7 ) page: 349 - 356   2020.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electrical Engineers of Japan  

    <p>Effects of environmental factors on partial discharge inception voltage (PDIV) under inverter surge voltage was discussed with multiple regression analysis in this study. As the environmental factors, humidity, temperature, and pressure were taken into account. These factors can change in high-voltage motors used for actual vehicles. The PDIV under a surge voltage showed different changes from that under sinusoidal voltage due to variation of initial electron generation probability depending on environmental change. Our results revealed that humidity has a significant effect on the PDIV under surge voltage, and there are interactive effects between humidity and temperature, and humidity and pressure. We discussed the effect of humidity and these interactions in terms of the generation of initial electrons from the air and verified this by measuring the density of negative ions in the air.</p>

    DOI: 10.1541/ieejfms.140.349

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  11. Fault Current Limitation Coordination of Multiple SFCLs in IEEE 14-Bus Test System Reviewed International journal

    N. Hayakawa, Y. Mori, H. Kojima

    Journal of Physics: Conference Series   Vol. 1559 ( 1 ) page: 012138   2020.6

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    We have proposed the concept of "fault current limitation coordination" of multiple superconducting fault current limiters (SFCL) to be introduced in a future electric power grid. Using a simplified test system, the transients on fault current and internal phase angle of generators were analyzed by PSCAD/EMTDC and the modeling of resistive SFCL with a variable resistance as a function of both current and temperature at the recovery under load. In this paper, we extended the analyses to the fault current limitation coordination of multiple SFCLs in IEEE 14-bus test system. The effective coordination strategy on the introduction and operation of multiple SFCLs, e.g. introduction lines of SFCLs, operation parameters such as operating current, critical current and prospective fault current of each SFCL, was discussed and optimized for an arbitrary fault location in the test system.

    DOI: 10.1088/1742-6596/1559/1/012138

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  12. Quench-induced Dynamic Breakdown Characteristics of HTS Pancake Coil Model for Resistive SFCL Reviewed International journal

    N. Hayakawa, M. Mimbu, Y. Mori, H. Kojima, S. Isojima, M. Kuwata

    Journal of Physics: Conference Series   Vol. 1559 ( 1 ) page: 012100   2020.6

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    Quench-induced dynamic breakdown (BD) characteristics of LN2 under transient bubble disturbance at the quench of HTS tapes are crucial to the reliable and rational insulation design of resistive superconducting fault current limiters (RSFCL). We have been investigating the dynamic BD characteristics using a nichrome pancake coil model for RSFCL using bifilar nichrome tapes as a heater. In this paper, we fabricated an HTS pancake coil model for RSFCL using GdBCO tapes and discussed the dynamic BD characteristics as a function of heat flux generated from the actually quenched HTS tapes.

    DOI: 10.1088/1742-6596/1559/1/012100

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  13. Elemental Consideration of Carbonization Phenomena in Inverter Fed Motor Reviewed

    Y. Yoshitake, H. Kojima, Y. Kasai, S. Maruyama, H. Kojima, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 140 ( 1 ) page: 40 - 47   2020.1

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    <p>“Carbonization” were detected as the precursor phenomena on the insulation burning of rotating machine, and we have studied the generation condition for higher <i>dV/dt</i> of the inverter surge. We built the experimental setup of elemental model, which could simulate the steeper surge from SiC device inverter and construct the stator insulation system inside the motor core to control the insulation sheets configuration. By revealing the quantitative conditions of the carbonization generation, we verified that the voltage to suppress the carbonization generation depended on the location of the mold release layer. Therefore, we developed the guideline of insulation design to prevent the carbonization for the steeper inverter surge.</p>

    DOI: 10.1541/ieejfms.140.40

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  14. Comparison of Permittivity Gradient in Resin Injected and Simulated Cone-Shaped Spacers Reviewed International journal

    T. Imai, M. Takeuchi, Y. Hoshina, H. Kojima, N. Hayakawa

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 26 ( 5 ) page: 1678 - 1685   2019.10

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    Functionally graded materials are at the cutting edge of material technology. They will enable high efficiency and downsizing of apparatus leading to energy conservation in the power sector. Spacers with graded relative permittivity enable a decrease in the diameter of gas-insulated switchgears. Distribution of epoxy-based composite materials (resins) with different permittivities dominate the permittivity gradient in spacers. This paper compares resin injected spacers with simulation. High-permittivity resins, mixtures of high/low-permittivity resins at various mixing ratios, and low-permittivity resins were continuously injected to form spacers. In these spacers, both experiment and simulation showed similar tendencies of resin distribution and demonstrated permittivity gradients. Moreover, the high-permittivity resins were localized on the outlet sides rather than the inlet sides in both experimental and in simulation, and the simulation showed a stronger localization behavior than in the experiment.

    DOI: 10.1109/TDEI.2019.008240

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  15. Resin Injection Behavior in Process of Manufacturing Insulation Spacer with Permittivity Gradient Using Computational Fluid Dynamics Reviewed International journal

    T. Imai, Y. Hoshina, H. Kojima, N. Hayakawa

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 26 ( 5 ) page: 1669 - 1677   2019.10

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    The advent of new technology for designing insulation materials with desired properties stimulates our interest in development of insulation spacers in gas-insulated switchgear (GIS). Tailoring of two kinds of epoxy-based composite materials (resins) with different relative permittivities enables development of insulation spacers with graded permittivity that decrease the diameter of a GIS tank. Computational fluid dynamics for the resin injection process based on the properties of resin mixtures at various mixing ratios between two resins with high/low relative permittivity enables us to estimate the injection behavior and distribution of resins in the manufacturing of insulation spacers. Simulation results demonstrated the gradient of resins in the insulation spacers by this resin injection method using two resins. In particular, the insulation spacer formed by two or four injection inlets have a more favorable distribution of resins than that achieved by one injection inlet.

    DOI: 10.1109/TDEI.2019.008239

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  16. Dynamic Breakdown Characteristics of Pancake Coil Model for Resistive-Type Superconducting Fault Current Limiters Reviewed International journal

    N. Hayakawa, M. Mimbu, H. Kojima, S. Isojima, M. Kuwata

    IEEE Transactions on Applied Superconductivity   Vol. 29 ( 5 ) page: 5603106   2019.8

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    Toward the reliable and rational insulation design of resistive-type superconducting fault current limiters (RSFCL), we have been investigating not only the intrinsic breakdown (BD) characteristics of liquid nitrogen (LN2) without bubbles but also the dynamic BD characteristics of LN2 under the transient bubble disturbance at the quench of RSFCL coils. We have so far used a fundamental model such as sphere-plane electrode system with quasi-uniform electric field. However, when RSFCL will be introduced in a future electric power network, a stack of pancake coils with non-uniform electric field will be adopted for the practical development of RSFCL. In this paper, we designed and fabricated a pancake coil model for RSFCL, and investigated the intrinsic and dynamic BD characteristics of the pancake coil models in LN2. Experimental results are discussed in terms of the volume effect of intrinsic and dynamic BD strength under non-uniform electric field.

    DOI: 10.1109/TASC.2019.2909200

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  17. Combined Effect of Temperature and Humidity on Partial Discharge Inception Voltage of Magnet Wires under Inverter-Surge Voltage Reviewed

    T. Kaji, H. Asai, H. Kojima, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 139 ( 1 ) page: 30 - 37   2019.1

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    <p>We investigated the combined effect of temperature and humidity on partial discharge inception voltage (PDIV) of magnet wires under repetitive surge-wave voltages. As the results, the PDIV increased as the temperature increased in the environment of uncontrolled humidity, which is peculiar under surge-wave voltage. On the other hand in the environment of controlled humidity, the PDIV decreased monotonically as the temperature increased. We found that the PDIV increase was attributed to the effect of the relative humidity decrease corresponding to the temperature increase. Furthermore, the PDIV was also influenced by the water amount in insulation film. The PDIV during the temperature increase was lower than that during the temperature decrease with the hysteresis. The lower PDIV at the higher water amount is due to the release of water into the air gap as well as the decrease in the first ionization energy of insulation film, leading to the increase in the generation probability of an initial electron.</p>

    DOI: 10.1541/ieejfms.139.30

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  18. Simulation on Discharge Inception Voltage Improvement of GIS Spacer with Permittivity Graded Materials (ε-FGM) Using Flexible Mixture Casting Method Reviewed International journal

    N. Hayakawa, Y. Miyaji, H. Kojima, K. Kato

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 25 ( 4 ) page: 1318 - 1323   2018.8

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    For electric field grading in GIS spacers, the application of functionally graded materials (FGM) with spatial distribution of dielectric permittivity (ϵ) can be one effective solution. In this paper, we propose the flexible mixture casting (FMC) method as a novel and practical technique to fabricate ϵ-FGM for GIS spacers. We verified that the relative permittivity (er) can be controlled from ϵr = 4 to ϵr = 30 by varying the loading ratio of high permittivity filler particles under the FMC method. Toward the practical application of ϵ-FGM, we verified the relaxation effect of maximum electric field strength and the improvement effect of discharge inception voltage in SF6 gas in a simplified GIS spacer model using ϵ-FGM under the FMC method. Simulation results revealed that the maximum electric field strength can be effectively reduced and the discharge inception voltage can be significantly improved compared with using a constant and uniform permittivity.

    DOI: 10.1109/TDEI.2018.007236

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  19. Volume Effect of Dynamic Breakdown Strength in LN2 for Insulation Design of Resistive Superconducting Fault Current Limiters Reviewed International journal

    N. Hayakawa, K. Ishida, M. Mimbu, H. Kojima, S. Isojima, M. Kuwata

    IEEE Transactions on Applied Superconductivity   Vol. 28 ( 4 ) page: 5600804   2018.6

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    Toward the practical and rational insulation design of a resistive superconducting fault current limiter, it is necessary to consider the electrical breakdown (BD) due to the transient bubble generation in liquid nitrogen (LN2) at the quench of the HTS materials. We have been investigating the intrinsic BD characteristics of LN2 without bubbles and the dynamic BD characteristics of LN2 under transient bubble disturbance, respectively. In this paper, we have investigated the dynamic BD characteristics of LN2 for different electrode diameters and gap lengths, and have discussed in terms of the volume effect of dynamic BD strength.

    DOI: 10.1109/TASC.2018.2799308

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  20. Fault Current Limitation Coordination in Electric Power Grid with Superconducting Fault Current Limiters Reviewed International journal

    N. Hayakawa, Y. Maeno, H. Kojima

    IEEE Transactions on Applied Superconductivity   Vol. 28 ( 4 ) page: 5602304   2018.6

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    This paper proposes the concept of 'fault current limitation coordination' in a future electric power grid with multiple superconducting fault current limiters (SFCL). Not only the fault current limitation of each SFCL on a transmission line, but also the transient stability of the grid with SFCLs should be taken into account, because the disturbance is brought about in the grid by the sudden appearance and disappearance of a large impedance of SFCL at the fault current limitation and recovery after the fault clearance, respectively. In this paper, both of the fault current limitation of SFCLs and the internal phase angle oscillation of generators were calculated by PSCAD/EMTDC to evaluate the operational feasibility or coordination of SFCLs in a 275/77-kV transmission system model.

    DOI: 10.1109/TASC.2018.2818279

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  21. Fabrication of GIS Spacer Model with ε-FGM (Functionally Graded Materials) and Theoretical Estimation of its Breakdown Voltage in SF<sub>6</sub> Gas Reviewed

    Y. Miyaji, H. Kojima, K. Kato, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 138 ( 4 ) page: 155 - 162   2018.4

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    <p>For the relaxation and optimization of electric field distribution around Gas insulated switchgear (GIS) spacers, the application of functionally graded materials (FGM) with spatial distribution of dielectric permittivity (ε) can be one of the effective solutions. In this paper, we fabricated the coaxial disk-type ε-FGM using SrTiO<sub>3</sub>/SiO<sub>2</sub> particles by the centrifugal force method. We also proposed the coaxial cone-type ε-FGM by the flexible mixture casting method and evaluated its electric field reduction effect and breakdown voltage in SF<sub>6</sub> gas by the volume-time theory.</p>

    DOI: 10.1541/ieejfms.138.155

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  22. Improvement Mechanism of AC Breakdown Voltage of Insulating Oil with Dispersed Nanoparticles Invited International journal

    H. Kojima, T. Kondo, M. Hanai, N. Hayakawa

    Electronics and Communications in Japan   Vol. 100 ( 12 ) page: 69 - 75   2017.12

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    We investigated the fundamental insulation characteristics of insulating oil with dispersed nanoparticles. The AC breakdown voltage of the insulating oil increased by mixing the dispersed hydrophilic nanoparticles, because the hydrophilic nanoparticles absorbed moisture in the oil, which decreased the number of weak points in the oil for breakdown. In contrast, the hydrophobic nanoparticles did not contribute to the increase of AC breakdown voltage, and decreased the AC breakdown voltage. On the other hand, in the case of overdosing of nanoparticles, the aggregation of nanoparticles caused the decrease in the AC breakdown voltage of the oil, which depended upon the volume concentration of nanoparticles regardless of the diameter of nanoparticles. The aggregation of nanoparticles was led by dielectrophoresis phenomenon, which brought the gap length dependence of the AC breakdown voltage of the insulating oil with the dispersed nanoparticles, because the gradient of electric field strength at the gap was smaller in the case of shorter gap length.

    DOI: 10.1002/ecj.12016

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  23. Discharge Pattern Discrimination in Vacuum Interrupter with Non-contact Measurement of Shield Potential Reviewed International journal

    F. Kong, H. Kojima, N. Hayakawa, T. Kimura, M. Tsukima

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 24 ( 5 ) page: 3265 - 3269   2017.10

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    Vacuum interrupter has a composite insulation system. When an internal insulation fails, the discharge has complex and various patterns. Previously, based on the discharge development characteristics, we proposed a discrimination method for the discharge pattern in vacuum interrupter. We measured the applied voltage, anode current, and shield potential waveforms, respectively. From the analysis of the measured waveforms, we can estimate the discharge patterns and discharge path lengths. In this paper, a non-contact shield potential measurement was proposed when the shield potential cannot be measured directly. Furthermore, verification tests with this measurement method were conducted and the effectiveness of the discrimination method was confirmed.

    DOI: 10.1109/TDEI.2017.006512

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  24. Optimum Breakdown Charge for Maximum Dielectric Strength in Spark Conditioning in Vacuum under a Non-uniform Electric Field Reviewed International journal

    H. Kojima, T. Takahashi, N. Hayakawa, K. Hasegawa, M. Sakaki

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 24 ( 4 ) page: 2660 - 2665   2017.8

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    Spark conditioning is an effective method of increasing the dielectric strength in vacuum. In this paper, we determined the breakdown (BD) charge dependence for spark conditioning in vacuum under various non-uniform electric fields and with different anode materials. We discuss the BD mechanism in terms of BD arising from anode heating or cathode heating. Experimental results revealed that for anode heating BD, the longer the gap distance, the larger the BD charge needed to obtain maximum dielectric strength. In contrast, for cathode heating BD, the BD charge for maximum dielectric strength was smaller than that for anode heating BD. From these results, we estimated the optimal BD charge to maximize the 50% BD electric field strength, i.e. the dielectric strength, for spark conditioning in vacuum.

    DOI: 10.1109/TDEI.2017.006462

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  25. Discharge Pattern Discrimination for Composite Insulation System in Vacuum Invited International journal

    F. Kong, H. Kojima, T. Kimura, M. Tsukima, N. Hayakawa

    Electrical Engineering in Japan   Vol. 200 ( 3 ) page: 3 - 12   2017.8

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    In order to develop higher-voltage vacuum circuit breakers (VCBs), the investigation of discharge phenomenon in vacuum is necessary. In vacuum interrupters (VIs) with composite insulation systems, the discharge has complex and various patterns at the internal insulation failures. In this paper, based on the discharge development characteristics, we propose a discrimination method for the discharge pattern in vacuum. We measured the applied voltage, anode current, and shield potential waveforms, respectively. From the feature of the measured waveforms, we classified the discharge patterns. Furthermore, based on the relation between discharge development time and discharge path length, we estimated the discharge patterns and discharge path lengths. In addition, we conducted a verification experiment of the discrimination method using a VI model. Experimental results revealed that the estimated discharge patterns and discharge path lengths were consistent with the observed discharge ones and the effectiveness of the discrimination method was confirmed.

    DOI: 10.1002/eej.22982

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  26. Breakdown Characteristics and Mechanisms of Liquid Nitrogen under Transient Thermal Stress for Superconducting Fault Current Limiters Reviewed International journal

    N. Hayakawa, T. Matsuoka, H. Kojima, S. Isojima, M. Kuwata

    IEEE Transactions on Applied Superconductivity   Vol. 27 ( 4 ) page: 7700305   2017.6

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    We have been investigating the electrical breakdown (BD) characteristics of liquid nitrogen (LN2) with a transient thermal stresses to simulate the quench conditions of resistive-type superconducting fault current limiters (SFCL). We call such BD of LN2 with the transient thermal stress as 'dynamic BD,' and discriminate it from that with a continuous thermal stress. In this paper, we investigated the dynamic BD characteristics of LN2 for different LN2 pressures, electrode sizes, and terms of transient thermal stress input. In addition, we obtained the BD characteristics of LN2 with the continuous thermal stress, and compared them with the dynamic BD characteristics. Furthermore, we analyzed the statistical scattering of the time from the thermal stress input to the dynamic BD occurrence and discussed the dynamic BD mechanisms of LN2. We also proposed a flowchart of rational and reliable electrical insulation design of resistive-type SFCL based on the dynamic BD characteristics of LN2.

    DOI: 10.1109/TASC.2017.2651115

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  27. Electrical Insulation Characteristics and Mechanisms of Low Dielectric Loss Materials for High-Voltage HTS Cables Reviewed International journal

    N. Hayakawa, K. Ishida, T. Matsuoka, H. Kojima

    IEEE Transactions on Applied Superconductivity   Vol. 27 ( 4 ) page: 4800904   2017.6

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    Toward the practical development of high-voltage high-temperature superconducting (HTS) cables, high electrical insulation characteristics, and low dielectric loss become important. Dielectric loss drastically increases with the increase of operation voltage of HTS cables. Therefore, it is highly expected to find a novel insulating material with low dielectric loss for the high-voltage HTS cables. We have focused on Tyvek {^{\circledR}}, polyethylene (PE) nonwoven fabric, and Tyvek {^{\circledR}}/PE, a syntactic paper bonding PE-sheet on Tyvek{^{\circledR}} by heat, as low dielectric loss materials. In this paper, we investigated fundamental partial discharge inception characteristics and their mechanisms of Tyvek{^{\circledR}} immersed in liquid nitrogen (LN2).In addition, we compared the electrical insulation characteristics of Tyvek{^{\circledR}}, Tyvek {^{\circledR}}/PE, and polypropylene laminated paper (PPLP{^{\circledR}}), and discussed their mechanisms.

    DOI: 10.1109/TASC.2016.2645796

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  28. Calculation Model for Predicting Partial-discharge Inception Voltage in a Non-uniform Air Gap while Considering the Effect of Humidity Reviewed International journal

    T. Rokunohe, T. Kato, H. Kojima, N. Hayakawa, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 24 ( 2 ) page: 1123 - 1130   2017.4

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    A calculation model for predicting the inception of partial discharge (PD) in a non-uniform air gap on the basis of theories of electron avalanche and streamer phenomena is proposed. "Partial discharge inception voltages" (PDIVs), under an assumed absolute humidity of less than 20g/cm3, calculated using the proposed model were compared with experimentally measured ones and found to be almost equivalent. Furthermore, the relationship between negative ions and humidity was incorporated into the calculation model, and it was confirmed that the calculated and measured PDIVs tend to be the roughly the same under a wide humidity range under various gap length between electrodes. The proposed partial-discharge inception model based on theories mentioned above was therefore judged to be effective for predicting changes in PDIV when humidity changes.

    DOI: 10.1109/TDEI.2017.005920

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  29. Improvement Mechanism of AC Breakdown Voltage of Insulating Oil with Dispersed Nanoparticles Reviewed

    H. Kojima, T. Kondo, M. Hanai, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 137 ( 2 ) page: 101 - 106   2017.2

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    <p>We investigated the fundamental insulation characteristics of insulating oil with dispersed nanoparticles. The AC breakdown voltage of the insulating oil increased by mixing the dispersed hydrophilic nanoparticles, because the hydrophilic nanoparticles absorbed moisture in the oil, which decreased the number of weak points in the oil for breakdown. In contrast, the hydrophobic nanoparticles did not contribute to the increase of AC breakdown voltage, and decreased the AC breakdown voltage. On the other hand, in the case of overdosing of nanoparticles, the aggregation of nanoparticles caused the decrease in the AC breakdown voltage of the oil, which depended upon the volume concentration of nanoparticles regardless of the diameter of nanoparticles. The aggregation of nanoparticles was led by dielectrophoresis phenomenon, which brought the gap length dependence of the AC breakdown voltage of the insulating oil with the dispersed nanoparticles, because the gradient of electric field strength at the gap was smaller in the case of shorter gap length.</p>

    DOI: 10.1541/ieejfms.137.101

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  30. Reduction Method of Fluctuation in Partial Discharge Inception Voltage for Inverter-Fed Rectangular Wire Motors Invited International journal

    T. Wakimoto, H. Kojima, N. Hayakawa

    Electrical Engineering in Japan   Vol. 198 ( 2 ) page: 3 - 10   2017.1

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    We investigated the decisive factors that affect partial discharge inception voltage (PDIV) fluctuation between the coil wires under a sinusoidal voltage by using a rectangular wire motor. As a result, we found that PDIV under low humidity fluctuates by the surface charge, and PDIV under high humidity varies transitionally with the surface conductivity activated by predischarge. From these analyses, we proposed the measurement method of PDIV with a low fluctuation and transition for the rectangular wire motors, which will be optimized by environmental humidity, predischarge condition, and measuring frequency.

    DOI: 10.1002/eej.22908

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  31. Measurement and Evaluation of Partial Discharge Inception Voltage for Enameled Rectangular Wires under AC Voltage Reviewed International journal

    T. Wakimoto, H. Kojima, N. Hayakawa

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 23 ( 6 ) page: 3566-3574   2016.12

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    DOI: 10.1109/TDEI.2016.005645

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  32. Dependence of Spark Conditioning on Breakdown Charge and Electrode Material under a Non-Uniform Electric Field in Vacuum Reviewed International journal

    H. Kojima, T. Takahashi, N. Hayakawa, K. Hasegawa, H. Saito, M. Sakaki

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 23 ( 5 ) page: 3224-3230   2016.10

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    DOI: 10.1109/TDEI.2016.7736889

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  33. Discharge Pattern Discrimination for Composite Insulation System in Vacuum Reviewed

    F. Kong, H. Kojima, T. Kimura, M. Tsukima, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 136 ( 9 ) page: 594-602   2016.9

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    DOI: 10.1541/ieejfms.136.594

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  34. Discharge Characteristics for Various Discharge Patterns under Negative Lightning Impulse Voltage in Vacuum Reviewed International journal

    F. Kong, Y. Nakano, H. Kojima, N. Hayakawa, T. Kimura, M. Tsukima

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 23 ( 2 ) page: 813-818   2016.4

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    DOI: 10.1109/TDEI.2015.005388

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  35. Discharge Characteristics of Composite Insulation System with Floating Electrode and Solid Insulator in Vacuum Reviewed International journal

    F. Kong, Y. Nakano, H. Kojima, N. Hayakawa, T. Kimura, M. Tsukima

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 23 ( 2 ) page: 1219-1225   2016.4

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    DOI: 10.1109/TDEI.2015.005588

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  36. Pressure Dependence and Size Effect of LN2 Breakdown Characteristics Under Transient Thermal Stress Reviewed International journal

    N. Hayakawa, T. Matsuoka, K. Ishida, H. Kojima, S. Isojima, M. Kuwata

    IEEE Transactions on Applied Superconductivity   Vol. 26 ( 3 ) page: 7700604   2016.4

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    DOI: 10.1109/TASC.2016.2532469

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  37. Effective Secondary Electron Emission Coefficient under Transient Surface Charging on Insulator in Surface Flashover Development in Vacuum Reviewed

    Y. Nakano, H. Kojima, K. Tsuchiya, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 136 ( 3 ) page: 128-134   2016.3

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    DOI: 10.1541/ieejfms.136.128

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  38. Reduction Method of Fluctuation in Partial Discharge Inception Voltage for Inverter-fed Rectangular Wire Motors Reviewed

    T. Wakimoto, H. Kojima, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 136 ( 3 ) page: 121-127   2016.3

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    DOI: 10.1541/ieejfms.136.121

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  39. Fabrication and Simulation of Permittivity Graded Materials for Electric Field Grading of Gas Insulated Power Apparatus Reviewed International journal

    N. Hayakawa, J. Ishiguro, H. Kojima, K. Kato, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 23 ( 1 ) page: 547-554   2016.2

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    DOI: 10.1109/TDEI.2015.005237

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  40. Classification of Impulse Breakdown Mechanisms under Non-uniform Electric Field in Air Reviewed International journal

    H. Kojima, K. Hotta, T. Kitamura, N. Hayakawa, A. Otake, K. Kobayashi, T. Kato. T. Rokunohe, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 23 ( 1 ) page: 194-201   2016.2

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    DOI: 10.1109/TDEI.2015.005352

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  41. Analysis of Conditioning and Damaging Process in Vacuum based on Breakdown Probability Distribution Reviewed International journal

    H. Kojima, Y. Otake, T. Takahashi, N. Hayakawa, K. Hasegawa, H. Saito, M. Sakaki

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 23 ( 1 ) page: 43-48   2016.2

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    DOI: 10.1109/TDEI.2015.005248

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  42. Control and Suppression of Impulse Surface Flashover in Vacuum Based on Discharge Development Mechanisms Reviewed International journal

    Y. Nakano, H. Kojima, S. Iitsuka, K. Tsuchiya, N. Hayakawa

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 23 ( 1 ) page: 35-42   2016.2

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    DOI: 10.1109/TDEI.2015.005307

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  43. Transient Charging Characteristics in Surface Flashover Development Process due to Explosive Electron Emission in Vacuum Invited International journal

    Y. Nakano, H. Kojima, K. Tsuchiya, N. Hayakawa

    Electrical Engineering in Japan   Vol. 193 ( 2 ) page: 10-17   2015.11

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    DOI: 10.1002/eej.22739

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  44. Size Effect on Breakdown Strength in Sub-cooled Liquid Nitrogen for Superconducting Power Apparatus Reviewed International journal

    N. Hayakawa, S. Nishimachi, H. Kojima, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 22 ( 5 ) page: 2565-2571   2015.10

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    DOI: 10.1109/TDEI.2015.005089

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  45. Impulse Surface Flashover Development Associated with Transient Charging by Explosive Electron Emission in Vacuum Reviewed International journal

    Y. Nakano, H. Kojima, K. Tsuchiya, N. Hayakawa

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 22 ( 4 ) page: 2390-2397   2015.8

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    DOI: 10.1109/TDEI.2015.004948

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  46. Fault Current Limitation Coordination in Power Transmission System With Superconducting Fault Current Limiting Cables (SFCLC) Reviewed International journal

    H. Kojima, T. Osawa, N. Hayakawa

    IEEE Transactions on Applied Superconductivity   Vol. 25 ( 3 ) page: 5401904   2015.6

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    DOI: 10.1109/TASC.2015.2392251

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  47. Quench-Induced Dynamic Breakdown Characteristics of LN2 and LN2/PPLP Composite Electrical Insulation System for Superconducting Power Apparatus Reviewed International journal

    N. Hayakawa, T. Matsuoka, S. Nishimachi, H. Kojima

    IEEE Transactions on Applied Superconductivity   Vol. 25 ( 3 ) page: 7700304   2015.6

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    DOI: 10.1109/TASC.2014.2361405

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  48. Power Flow Control and Maintenance Strategy of Transformers in Transmission and Distribution Systems Reviewed

    H. Kojima, K. Fukaya, N. Hayakawa, M. Hanai, H. Okubo

    IEEJ Transactions on Power and Energy   Vol. 135 ( 5 ) page: 316-321   2015.5

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    DOI: 10.1541/ieejpes.135.316

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  49. Transient Charging Characteristics in Surface Flashover Development Process due to Explosive Electron Emission in Vacuum Reviewed

    Y. Nakano, H. Kojima, K. Tsuchiya, N. Hayakawa

    IEEJ Transactions on Fundamentals and Materials   Vol. 134 ( 11 ) page: 578-584   2014.11

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    DOI: 10.1541/ieejfms.134.578

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  50. Influence of Longitudinal Temperature Distribution on Current Limiting Function of Superconducting Fault Current Limiting Cable (SFCLC) Reviewed International journal

    H. Kojima, T. Osawa, N. Hayakawa, M. Hanai, H. Okubo

    Journal of Physics: Conference Series   Vol. 507 ( 3 ) page: 032026   2014.5

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    DOI: 10.1088/1742-6596/507/3/032026

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  51. Pre-discharge and Flashover Characteristics of Impulse Surface Discharge in Vacuum Reviewed International journal

    Y. Nakano, H. Kojima, N. Hayakawa, K. Tsuchiya, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 21 ( 1 ) page: 403-410   2014.2

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    DOI: 10.1109/TDEI.2013.004136

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  52. Technique for Discriminating the Type of PD in SF6 Gas Using the UHF Method and the PD Current with a Metallic Particle Reviewed International journal

    M. Hanai, H. Kojima, N. Hayakawa, R. Mizuno, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 21 ( 1 ) page: 88-95   2014.2

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    DOI: 10.1109/TDEI.2013.004021

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  53. Development of a Partial Discharge Inception Calculation Model of a Nonuniform Air Gap Considering the Effect of Humidity Invited International journal

    N. Yanagita, T. Kato, T. Rokunohe, T. Iwata, H. Kojima, N. Hayakawa, H. Okubo

    Electrical Engineering in Japan   Vol. 186 ( 3 ) page: 1-9   2014.2

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    DOI: 10.1002/eej.22351

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  54. Integration of Asset Management and Smart Grid with Intelligent Grid Management System Reviewed International journal

    M. Hanai, H. Kojima, N. Hayakawa, K. Shinoda, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 20 ( 6 ) page: 2195-2202   2013.12

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    DOI: 10.1109/TDEI.2013.6678870

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  55. Feasibility Study on Superconducting Power Flow Controller and Fault Current Limiter (SPFCL) Reviewed International journal

    N. Hayakawa, X. Mao, H. Kojima, M. Hanai, H. Okubo, N. Kashima, S. Nagaya, S. Sugimoto

    IEEE Transactions on Applied Superconductivity   Vol. 23 ( 3 ) page: 5600504   2013.6

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    DOI: 10.1109/TASC.2012.2230677

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  56. Physical Mechanisms of Partial Discharges at Nitrogen Filled Delamination in Epoxy Cast Resin Power Apparatus Reviewed International journal

    D.-E. A. Mansour, H. Kojima, N. Hayakawa, M. Hanai, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 20 ( 2 ) page: 454-461   2013.4

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    DOI: 10.1109/TDEI.2013.6508747

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  57. Identification of Metallic Particle Defect in GIS Based on Partial Discharge Mechanism Reviewed

    H. Kojima, T. Suzuki, N. Hayakawa, M. Hanai, H. Okubo

    IEEJ Transactions on Power and Energy   Vol. 133 ( 1 ) page: 114-120   2013.1

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    DOI: 10.1541/ieejpes.133.114

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  58. Current Limitation and Recovery Function for Superconducting Fault Current Limiting Transformer (SFCLT) Reviewed International journal

    J. Himbele, H. Kojima, N. Hayakawa, M. Hanai, H. Okubo

    Physics Procedia   Vol. 36   page: 341-344   2012.9

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    DOI: 10.1016/j.phpro.2012.06.137

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  59. Recent Progress in Electrical Insulation Techniques for HTS Power Apparatus Reviewed International journal

    N. Hayakawa, H. Kojima, M. Hanai, H. Okubo

    Physics Procedia   Vol. 36   page: 1305-1308   2012.9

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    DOI: 10.1016/j.phpro.2012.06.295

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  60. Superconducting Fault Current Limiting Cable (SFCLC) with Current Limitation and Recovery Function Reviewed International journal

    H. Kojima, F. Kato, N. Hayakawa, M. Hanai, H. Okubo

    Physics Procedia   Vol. 36   page: 1296-1300   2012.9

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    DOI: 10.1016/j.phpro.2012.06.293

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  61. Feasibility Study on a High-Temperature Superconducting Fault-Current-Limiting Cable (SFCLC) Using Flux-Flow Resistance Reviewed International journal

    H. Kojima, F. Kato, N. Hayakawa, M. Hanai, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 22 ( 2 ) page: 4800105   2012.4

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    DOI: 10.1109/TASC.2011.2173339

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  62. Development of the Partial Discharge Inception Calculation Model in a Non-uniform Air Gap Considering the Effect of Humidity Reviewed

    N. Yanagita, T. Kato, T. Rokunohe, T. Iwata, H. Kojima, N. Hayakawa, H. Okubo

    IEEJ Transactions on Fundamentals and Materials   Vol. 131 ( 12 ) page: 1017-1023   2011.12

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    DOI: 10.1541/ieejfms.131.1017

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  63. Conditioning Mechanism of Cu-Cr Electrode Based on Electrode Surface State under Impulse Voltage Application in Vacuum Reviewed International journal

    H. Kojima, N. Hayakawa, R. Nishimura, H. Okubo, H. Sato, H. Saito, Y. Noda

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 18 ( 6 ) page: 2108-2114   2011.12

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    DOI: 10.1109/TDEI.2011.6118651

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  64. Identification of Insulation Defect by Sequential Measurement of Partial Discharge in GIS Reviewed

    M. Yoshida, K. Suzuki, H. Kojima, N. Hayakawa, M. Hanai, H. Okubo

    IEEJ Transactions on Power and Energy   Vol. 131 ( 11 ) page: 905-911   2011.11

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    DOI: 10.1541/ieejpes.131.905

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  65. Progress in Development of Superconducting Fault Current Limiting Transformer (SFCLT) Reviewed International journal

    N. Hayakawa, H. Kojima, M. Hanai, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 21 ( 3 ) page: 1397-1400   2011.6

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    DOI: 10.1109/TASC.2010.2089412

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  66. Analysis of Current Limiting and Recovery Characteristics of Superconducting Fault Current Limiting Transformer (SFCLT) with YBCO Coated Conductors Reviewed International journal

    N. Hayakawa, T. Kito, H. Kojima, M. Hanai, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 21 ( 3 ) page: 1422-1425   2011.6

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    DOI: 10.1109/TASC.2011.2105234

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  67. Current Limiting and Recovery Characteristics of 2 MVA Class Superconducting Fault Current Limiting Transformer (SFCLT) Reviewed International journal

    H. Kojima, M. Kotari, T. Kito, N. Hayakawa, M. Hanai, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 21 ( 3 ) page: 1401-1404   2011.6

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    DOI: 10.1109/TASC.2010.2089413

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  68. Development Process of Impulse Surface Flashover on Alumina Dielectrics in Vacuum Reviewed International journal

    H. Kojima, N. Hayakawa, T. Ishida, H. Okubo, K. Tsuchiya

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 18 ( 3 ) page: 918-923   2011.6

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    DOI: 10.1109/TDEI.2011.5931081

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  69. Evaluation of UHF Method for Partial Discharge Measurement by Simultaneous Observation of UHF Signal and Current Pulse Waveforms Reviewed International journal

    M. Yoshida, H. Kojima, N. Hayakawa, F. Endo, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 18 ( 2 ) page: 425-431   2011.4

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    DOI: 10.1109/TDEI.2011.5739446

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  70. Mechanism of Small Current Generation under Impulse Voltage Applications in Vacuum Reviewed

    K. Aoki, H. Yasukawa, H. Kojima, M. Homma, T. Shioiri, H. Okubo

    IEEJ Transactions on Fundamentals and Materials   Vol. 130 ( 9 ) page: 781-786   2010.9

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    DOI: 10.1541/ieejfms.130.781

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  71. Partial Discharge Activities under AC/Impulse Superimposed Voltage in LN2/Polypropylene Laminated Paper Insulation System for HTS Cables Reviewed International journal

    N. Hayakawa, R. Yamaguchi, Y. Ukai, H. Kojima, F. Endo, H. Okubo

    Journal of Physics: Conference Series   Vol. 234   page: 032020   2010.7

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    DOI: 10.1088/1742-6596/234/3/032020

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  72. Development of 2MVA Class Superconducting Fault Current Limiting Transformer (SFCLT) with YBCO Coated Conductors Reviewed International journal

    M. Kotari, H. Kojima, N. Hayakawa, F. Endo, H. Okubo

    Journal of Physics: Conference Series   Vol. 234   page: 032070   2010.7

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    DOI: 10.1088/1742-6596/234/3/032070

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  73. Partial Discharges and Associated Mechanisms for Micro Gap Delamination at Epoxy Spacer in GIS Reviewed International journal

    D.A. Mansour, H. Kojima, N. Hayakawa, F. Endo, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 17 ( 3 ) page: 855-861   2010.6

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    DOI: 10.1109/TDEI.2010.5492259

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  74. Charge Accumulation Effects on Time Transition of Partial Discharge Activity at GIS Spacer Defects Reviewed International journal

    D.-E.A. Mansour, K. Nishizawa, H. Kojima, N. Hayakawa, F. Endo, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 17 ( 1 ) page: 247-255   2010.2

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    DOI: 10.1109/TDEI.2010.5412024

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  75. Surface Charge Accumulation and Partial Discharge Activity for Small Gaps of Electrode/Epoxy Interface in SF6 gas Reviewed International journal

    D. Mansour, H. Kojima, N. Hayakawa, F. Endo, H. Okubo

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 16 ( 4 ) page: 1150-1157   2009.9

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    DOI: 10.1109/TDEI.2009.5211869

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  76. Dynamic Thermal Characteristics of HTS Coil for Conduction-cooled SMES Reviewed International journal

    H. Kojima, X. Chen, N. Hayakawa, F. Endo, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 19 ( 3 ) page: 2036-2039   2009.6

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    DOI: 10.1109/TASC.2009.2019238

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  77. Current Limiting Characteristics of Parallel-connected Coated Conductors for High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT) Reviewed International journal

    K. Omura, H. Kojima, N. Hayakawa, F. Endo, M. Noe, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 19 ( 3 ) page: 1880-1883   2009.6

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    DOI: 10.1109/TASC.2009.2018067

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  78. Partial Discharge Activity in Electrical Insulation for High Temperature Superconducting (HTS) Cables Reviewed International journal

    H. Okubo, H. Kojima, F. Endo, K. Sahara, R. Yamaguchi, N. Hayakawa

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 15 ( 3 ) page: 647-654   2008.6

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    DOI: 10.1109/TDEI.2008.4543100

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  79. Quench-Induced Partial Discharge Characteristics of HTS Cables Reviewed International journal

    N. Hayakawa, S. Ueyama, H. Kojima, F. Endo, Y. Ashibe, T. Masuda, M. Hirose

    Journal of Physics: Conference Series   Vol. 97   page: 012053   2008.3

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    DOI: 10.1088/1742-6596/97/1/012053

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  80. Self-recovery Characteristics of High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT) with 2G Coated Conductors Reviewed International journal

    H. Kojima, S. Itoh, N. Hayakawa, F. Endo, M. Noe, H. Okubo

    Journal of Physics: Conference Series   Vol. 97   page: 012154   2008.3

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    DOI: 10.1088/1742-6596/97/1/012154

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  81. Breakdown Characteristics of N2O Gas Mixtures for Quasi-uniform Electric Field under Lightning Impulse Voltage Reviewed International journal

    H. Kojima, O. Kinoshita, N. Hayakawa, F. Endo, H. Okubo, M. Yoshida, T. Ogawa

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 14 ( 6 ) page: 1492-1497   2007.12

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    DOI: 10.1109/TDEI.2007.4401233

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  82. Electrical Insulation Characteristics of HTS Cables under Quench-Induced Thermal Stress Condition Reviewed International journal

    N. Hayakawa, S. Ueyama, H. Kojima, F. Endo, T. Masuda, M. Hirose

    IEEE Transactions on Applied Superconductivity   Vol. 17 ( 2 ) page: 1660-1663   2007.7

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    DOI: 10.1109/TASC.2007.899968

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  83. Thermal Runaway Characteristics of Bi2212 Coil for Conduction-cooled SMES Reviewed International journal

    H. Kojima, N. Hayakawa, S. Noguchi, F. Endo, N. Hirano, S. Nagaya, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 17 ( 2 ) page: 1959-1962   2007.7

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    DOI: 10.1109/TASC.2007.898492

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  84. High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT) with 2G Coated Conductors Reviewed International coauthorship International journal

    H. Okubo, C. Kurupakorn, S. Ito, H. Kojima, N. Hayakawa, F. Endo, M. Noe

    IEEE Transactions on Applied Superconductivity   Vol. 17 ( 2 ) page: 1768-1771   2007.7

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    DOI: 10.1109/TASC.2007.897813

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  85. Synergy Effect in Electrical Insulation Characteristics of N2O Gas Mixtures Reviewed

    N. Hayakawa, O. Kinoshita, H. Kojima, F. Endo, M. Yoshida, T. Ogawa, H. Okubo

    IEEJ Transactions on Power and Energy   Vol. 126 ( 11 ) page: 1164-1170   2006.11

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    DOI: 10.1541/ieejpes.126.1164

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  86. Simulation of Electrical and Thermal Behavior of High Temperature Superconducting Fault Current Limiting Transformer (HTc-SFCLT) Reviewed International coauthorship International journal

    C. Kurupakorn, H. Kojima, N. Hayakawa, F. Endo, N. Kashima, S. Nagaya, M. Noe, H. Okubo

    Journal of Physics: Conference Series   Vol. 43   page: 950-953   2006.8

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    DOI: 10.1088/1742-6596/43/1/232

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  87. Electrical and Thermal Characteristics of Bi2212/Ag HTS Coils for Conduction-cooled SMES Reviewed International journal

    N. Hayakawa, S. Noguchi, C. Kurupakorn, H. Kojima, F. Endo, N. Hirano, S. Nagaya, H. Okubo

    Journal of Physics: Conference Series   Vol. 43   page: 813-816   2006.8

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    DOI: 10.1088/1742-6596/43/1/198

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  88. Impulse and AC Partial Discharge Inception and Breakdown Characteristics of LN2/Polypropylene Laminated Paper Composite Insulation System Reviewed International journal

    H. Okubo, H. Kojima, F. Endo, K. Sahara, N. Hayakawa

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 13 ( 3 ) page: 664-669   2006.6

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    DOI: 10.1109/TDEI.2006.1657982

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  89. Temperature Dependence of Critical Current at 4.2K-55K of Conduction-cooled Bi2212/Ag Wires for SMES Reviewed International journal

    H. Kojima, S. Noguchi, C. Kurupakorn, N. Hayakawa, M. Goto, N. Hirano, S. Nagaya, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 15 ( 2 ) page: 2550-2553   2005.6

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    DOI: 10.1109/TASC.2005.847646

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  90. Dielectric Characteristics of HTS Cables Based on Partial Discharge Measurement Reviewed International journal

    N. Hayakawa, M. Nagino, H. Kojima, M. Goto, T. Takahashi, K. Yasuda, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 15 ( 2 ) page: 1802-1805   2005.6

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    DOI: 10.1109/TASC.2005.849292

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  91. Recovery Characteristics after Current Limitation of High Temperature Superconducting Fault Current Limiting Transformer (HTc-SFCLT) Reviewed International coauthorship International journal

    C. Kurupakorn, H. Kojima, N. Hayakawa, M. Goto, N. Kashima, S. Nagaya, M. Noe, K.-P. Juengst, H. Okubo

    IEEE Transactions on Applied Superconductivity   Vol. 15 ( 2 ) page: 1859-1862   2005.6

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    DOI: 10.1109/TASC.2005.849314

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  92. Formation of Deep Potential Well and its Structural Transition in Small Tokamak Device International journal

    Y. Fukuzawa, H. Kojima, T. Okada, N. Ohno, S. Takamura

    Europhysics Conference Abstracts   Vol. 28G   page: P-5.075   2004.7

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  93. Formation and Dynamics of Very Deep Negative Potential Well in the Small Tokamak Device CSTN-IV Reviewed International journal

    H. Kojima, Y. Fukuzawa, T. Manabe, S. Takamura, T. Okada, N. Ohno

    Czechoslovak Journal of Physics   Vol. 53 ( 10 ) page: 895–902   2003.10

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1023/A:1026392406717

    Web of Science

    Scopus

    J-GLOBAL

  94. Spatiotemporal Behavior of Hydrogen Recycling due to the Rotating Magnetic Field Reviewed International journal

    H. Kojima, S. Takamura

    Japanese Journal of Applied Physics   Vol. 42 ( 9A ) page: 5797-5798   2003.9

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1143/JJAP.42.5797

    Web of Science

    Scopus

    J-GLOBAL

  95. Structural Dynamics of Deep Negative Potential Well Formation in Small Tokamak Device CSTN-IV International journal

    H. Kojima, Y. Fukuzawa, T. Manabe, N. Ohno, S. Takamura

    Europhysics Conference Abstracts   Vol. 27A   page: P-2.130   2003.9

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

  96. Effects of Rotating Helical Magnetic Field on Inhomogeneities of Hydrogen Recycling in a Tokamak Discharge Reviewed International journal

    H. Kojima, S. Takamura

    Japanese Journal of Applied Physics   Vol. 41 ( 11A ) page: 6557-6562   2002.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1143/JJAP.41.6557

    Web of Science

    Scopus

    J-GLOBAL

  97. Characteristics of Local Helical Coil System for Dynamic Ergodic Divertor Invited International journal

    Y. Kikuchi, H. Kojima, T. Taniyama, M. Toyoda, Y. Uesugi, S. Takamura

    Electrical Engineering in Japan   Vol. 139 ( 1 ) page: 16-23   2002.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/eej.1142

    Web of Science

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    J-GLOBAL

  98. Toroidal Dependence of Hydrogen Recycling Property with Helical Magnetic Perturbation in Long Time Discharge International journal

    H. Kojima, S. Takamura

    Europhysics Conference Abstracts   Vol. 25A   page: 2129-2132   2001.12

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  99. Effects of Dynamic Island Formations on Rotating Helical Magnetic Field Penetration into the Tokamak Plasma International journal

    Y. Kikuchi, H. Kojima, T. Taniyama, M. Toyoda, Y. Uesugi, S. Takamura

    Europhysics Conference Abstracts   Vol. 25A   page: 277-280   2001.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  100. Characteristics of Local Helical Coil System for Dynamic Ergodic Divertor Reviewed

    Y. Kikuchi, H. Kojima, T. Taniyama, M. Toyoda, Y. Uesugi, S. Takamura

    IEEJ Transactions on Fundamentals and Materials   Vol. 121 ( 3 ) page: 249-255   2001.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1541/ieejfms1990.121.3_249

    J-GLOBAL

  101. Penetration Process of the Externally Applied Rotating Helical Field into the Tokamak Plasma International journal

    M. Kobayashi, H. Kojima, S. Takamura

    Europhysics Conference Abstracts   Vol. 24B   page: 1404-1407   2001.1

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  102. Research Tokamak System with Multimode Discharges Using Inverter Power Supply Invited International journal

    H. Kojima, M. Kobayashi, K. Tashiro, M. Takagi, S. Takamura

    Electrical Engineering in Japan   Vol. 133 ( 4 ) page: 8-18   2000.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/1520-6416(200012)133:4<8::AID-EEJ2>3.0.CO;2-I

    Web of Science

    Scopus

  103. Frequency Dependence of Tokamak Plasma Response to the Externally Applied Rotating Helical Field Reviewed International journal

    M. Kobayashi, H. Kojima, K. Zhai, S. Takamura

    Physics of Plasmas   Vol. 7 ( 8 ) page: 3288-3300   2000.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.874194

    Web of Science

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    J-GLOBAL

  104. Electrostatic Fluctuations in the Current Sustained Torus IV at Nagoya University Reviewed International journal

    K. Zhai, M. Kobayashi, K. Tashiro, H. Kojima, M. Takagi, S. Takamura

    Physics of Plasmas   Vol. 7 ( 6 ) page: 2449-2455   2000.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.874084

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  105. Interaction of Externally Applied Rotating Helical Field with Tokamak Plasma Reviewed International journal

    M. Kobayashi, T. Tuda, K. Tashiro, H. Kojima, Kan Zhai, S. Takamura

    Nuclear Fusion   Vol. 40 ( 2 ) page: 181-193   2000.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/0029-5515/40/2/304

    Scopus

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  106. Research Tokamak System with Multi-Mode Discharges Using Inverter Power Supply Reviewed

    H. Kojima, M. Kobayashi, K. Tashiro, M. Takagi, S. Takamura

    IEEJ Transactions on Fundamentals and Materials   Vol. 119 ( 12 ) page: 1436-1444   1999.12

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1541/ieejfms1990.119.12_1436

    J-GLOBAL

  107. Experimental Investigation on Penetration of Rotating Magnetic Perturbations into the Tokamak Plasma International journal

    M. Kobayashi, T. Tuda, Z. Kan, H. Kojima, K. Tashiro, S. Takamura

    Europhysics Conference Abstracts   Vol. 23J   page: 437-440   1999.7

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  108. Two-dimensional Structure of the Detached Recombining Helium Plasma Associated with Molecular Activated Recombination Reviewed International coauthorship International journal

    D. Nishijima, N. Ezumi, H. Kojima, N. Ohno, S. Takamura, S. I. Krasheninnikov, A. Yu. Pigarov

    Journal of Nuclear Materials   Vol. 266-269   page: 1161-1166   1999.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/S0022-3115(98)00565-0

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  109. Contribution of Molecular Activated Recombination to Hydrogen Plasma Detachment in the Divertor Plasma Simulator NAGDIS-II Reviewed International coauthorship International journal

    N. Ezumi, D. Nishijima, H. Kojima, N. Ohno, S. Takamura, S. I. Krasheninnikov, A. Yu. Pigarov

    Journal of Nuclear Materials   Vol. 266-269   page: 337-342   1999.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/S0022-3115(98)00533-9

    Web of Science

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  110. High-duty Long-duration Repetitive Tokamak Discharge with Static or Rotating Helical Magnetic Field at the Edge International journal

    S. Takamura, M. Kobayashi, K. Tashiro, H. Kojima, K. Zhai, N. Ohno, M. Y. Ye, Y. Uesugi, M. Takagi

    Europhysics Conference Abstracts   Vol. 22C   page: 722-725   1998.6

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  111. Investigation of Hydrogen Plasma Detachment in the Divertor Plasma Simulator NAGDIS-II International coauthorship International journal

    N. Ezumi, D. Nishijima, H. Kojima, N. Ohno, S. Takamura, S. I. Krasheninnikov, A. Yu. Pigarov

    Europhysics Conference Abstracts   Vol. 22C   page: 7-10   1998.6

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  112. Change in Detached Helium Plasma's Structure Associated with Molecular Activated Recombination International journal

    D. Nishijima, N. Ezumi, H. Kojima, N. Ohno, S. Takamura

    Europhysics Conference Abstracts   Vol. 22C   page: 114-117   1998.6

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Books 9

  1. Latest Standards and Future Technology Trends related to Gas Insulated Switchgear (GIS)

    The Investigation R&D Committee on Latest Standards and Future Technology Trend Related to Gas Insulated Switchgear (GIS)( Role: Contributor)

    The Institute of Electrical Engineers of Japan  2021.5 

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    Total pages:98   Language:Japanese Book type:Report

  2. Recent Trend on Diversification of Functions and Properties of Transformer

    Investigating R&D Committee for recent trend on diversification of functions and properties of transformer( Role: Contributor)

    The Institute of Electrical Engineers of Japan  2020.6 

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    Total pages:80   Language:Japanese Book type:Report

  3. Technical trend of applied IT and response to renewable energy as for gas-insulated switchgear

    Technical trends of a gas-insulated switchgear related to technologies needed for enhancing introduction of renewable energy, as well as using information technology( Role: Contributor)

    The Institute of Electrical Engineers of Japan  2020.4 

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    Total pages:66   Language:Japanese Book type:Report

  4. 高電圧絶縁技術 ― 9つの核心技術から学ぶ歴史と将来展望

    電気学会・高電圧電気絶縁技術の歴史調査専門委員会( Role: Contributor ,  2.4節,3.6節,第12章,終章)

    オーム社  2019.12  ( ISBN:978-4-274-22408-9

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    Total pages:360   Language:Japanese Book type:Scholarly book

    Other Link: https://www.amazon.co.jp/dp/4274224082

  5. Trends and Comparative Survey of Transformer Domestic and Overseas Standards

    Investigating R&D Committee of Trends and Comparative Survey of Transformer Domestic and Overseas Standards( Role: Contributor)

    The Institute of Electrical Engineers of Japan  2017.8 

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    Total pages:64   Language:Japanese Book type:Report

  6. (エコトピア科学シリーズ 3) 環境調和型社会のためのエネルギー科学

    名古屋大学未来材料・システム研究所 編( Role: Contributor ,  3.1節)

    コロナ社  2016.1  ( ISBN:978-4-339-06883-2

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    Total pages:238   Language:Japanese Book type:Scholarly book

    Other Link: https://www.amazon.co.jp/dp/4339068837/

  7. Recent trend of technical requirements for aged GIS

    Investigating R&D Committee on "Recent trend of technical requirements for aged GIS"( Role: Contributor)

    The Institute of Electrical Engineers of Japan  2015.5 

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    Total pages:84   Language:Japanese Book type:Report

  8. Recent Trend of Electrical and Acoustic Abnormality Diagnostic Technology for Oil-immersed Transformers

    Investigating R&D Transformer Committee( Role: Contributor)

    The Institute of Electrical Engineers of Japan  2015.3 

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    Total pages:79   Language:Japanese Book type:Report

  9. Superconducting Electric Power Apparatus and Systems toward their High Performance and Multifunctions

    Investigating R&D Committee on Superconducting Electric Power Apparatus and Systems toward their High Performance and Multifunctions( Role: Contributor)

    The Institute of Electrical Engineers of Japan  2013.9 

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    Total pages:83   Language:Japanese Book type:Report

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MISC 19

  1. 学界情報:8th International Conference on Condition Monitoring and Diagnosis (CMD2020) 報告 Invited

    小島寛樹

    電気学会論文誌B(電力・エネルギー部門誌)   Vol. 141 ( 6 ) page: NL6_3 - NL6_3   2021.6

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Meeting report   Publisher:一般社団法人 電気学会  

    DOI: 10.1541/ieejpes.141.nl6_3

    CiNii Research

  2. 研究グループ紹介:名古屋大学 大学院工学研究科 電気工学専攻 電力機器・エネルギー伝送工学研究グループ Invited

    早川直樹,小島寛樹

    電気学会論文誌A(基礎・材料・共通部門誌)   Vol. 141 ( 5 ) page: NL5_6 - NL5_6   2021.5

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:一般社団法人 電気学会  

    DOI: 10.1541/ieejfms.141.nl5_6

    CiNii Research

  3. Recent Progress in Electrical Discharges, Plasma, and Pulsed Power Technologies

    T. Shirafuji, A. Kumada, H. Kojima, K. Takahashi

    IEEJ Transactions on Fundamentals and Materials   Vol. 140 ( 1 ) page: 10 - 11   2020.1

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:The Institute of Electrical Engineers of Japan  

    <p>Recent technologies using electrical discharges, plasma, and pulsed power have been used in various areas involving high-voltage electric circuits/machines, organic/inorganic materials processing, environmental protection, biology, medicine, nuclear fusion, propulsion, high-energy particle beams, and high-power electromagnetic wave. This review describes recent progress in electrical discharges, plasma, and pulsed power technologies.</p>

    DOI: 10.1541/ieejfms.140.10

    Scopus

    CiNii Research

  4. 研究調査委員会 レポート:高電圧電気絶縁技術の歴史調査専門委員会

    大久保仁,五島久司,小島寛樹

    電気学会論文誌A(基礎・材料・共通部門誌)   Vol. 139 ( 3 ) page: NL3_4 - NL3_4   2019.3

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:一般社団法人 電気学会  

    DOI: 10.1541/ieejfms.139.nl3_4

    CiNii Research

  5. Dynamic Breakdown Characteristics of Pancake Coil Model for Resistive Superconducting Fault Current Limiters International journal

    N. Hayakawa, M. Mimbu, H. Kojima, S. Isojima, M. Kuwata

    IEEE CSC & ESAS Superconductivity News Forum   Vol. 13 ( 46 ) page: STP630   2019.2

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    Language:English   Publishing type:Research paper, summary (international conference)  

  6. 電気分野の人材確保は10年の計 Invited

    小島寛樹

    電気協会報   ( 1084 ) page: 2   2018.7

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)   Publisher:日本電気協会  

  7. いつ電気が苦手になるのか? Invited

    小島寛樹

    パワーアカデミー 研究者コラム   Vol. 25   2016.7

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:パワーアカデミー  

  8. 学界情報:18th International Symposium on High Voltage Engineering (ISH 2013) 報告

    小島寛樹

    電気学会論文誌B(電力・エネルギー部門誌)   Vol. 134 ( 2 ) page: NL2_3   2014.2

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Meeting report   Publisher:一般社団法人 電気学会  

    DOI: 10.1541/ieejpes.134.NL2_3

  9. 次世代科学技術を担う青少年に科学・電気のおもしろさを —東海地区学協会・団体共同による子ども向け科学教室—

    小島寛樹

    電気学会誌   Vol. 133 ( 6 ) page: 372   2013.6

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:一般社団法人 電気学会  

    DOI: 10.1541/ieejjournal.133.372

  10. 高レベル放射性廃棄物の地層処分に向けた技術開発 —(独) 日本原子力研究開発機構 瑞浪超深地層研究所—

    小島寛樹

    電気学会誌   Vol. 133 ( 1 ) page: 41   2013.1

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:一般社団法人 電気学会  

    DOI: 10.1541/ieejjournal.133.41

  11. 電力系統の保守と潮流の信頼性を確保する新しい概念「IGMS」

    花井正広,小島寛樹,早川直樹,大久保仁

    OHM   Vol. 99 ( 9 ) page: 4-5   2012.9

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:オーム社  

  12. 調査研究委員会レポート:超電導電力機器とシステムの高性能・多機能化調査専門委員会

    小島寛樹

    電気学会論文誌B(電力・エネルギー部門誌)   Vol. 131 ( 10 ) page: NL10_5   2011.10

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:一般社団法人 電気学会  

    DOI: 10.1541/ieejpes.131.NL10_5

  13. 学界情報:International Conference on High Voltage Engineering and Application 2010 (ICHVE2010) 報告

    小島寛樹

    電気学会論文誌B(電力・エネルギー部門誌)   Vol. 131 ( 4 ) page: 398   2011.4

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Meeting report   Publisher:一般社団法人 電気学会  

    DOI: 10.1541/ieejpes.131.398

  14. Current Limiting and Recovery Characteristics of 2 MVA Class Superconducting Fault Current Limiting Transformer (SFCLT) International journal

    H. Kojima, M. Kotari, T. Kito, N. Hayakawa, M. Hanai, H. Okubo

    IEEE/CSC & ESAS European Superconductivity News Forum   ( 15 ) page: 3LZ-05(ST220)   2011.1

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper, summary (international conference)  

  15. 超電導限流変圧器(SFCLT)の開発

    大久保仁,早川直樹,小島寛樹

    OHM   Vol. 97 ( 8 ) page: 2-3   2010.8

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:オーム社  

  16. Development of 2MVA Class Superconducting Fault Current Limiting Transformer (SFCLT) with YBCO Coated Conductors International coauthorship International journal

    M. Kotari, K. Omura, H. Kojima, N. Hayakawa, F. Endo, M. Noe, H. Okubo

    IEEE/CSC & ESAS European Superconductivity News Forum   ( 11 ) page: ST141   2010.1

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    Language:English   Publishing type:Research paper, summary (international conference)  

  17. Partial Discharge Activities under AC/Impulse Superimposed Voltage in LN2/Polypropylene Laminated Paper Insulation System for HTS Cables International journal

    N. Hayakawa, R. Yamaguchi, Y. Ukai, H. Kojima, F. Endo, H. Okubo

    IEEE/CSC & ESAS European Superconductivity News Forum   ( 11 ) page: ST179   2010.1

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    Language:English   Publishing type:Research paper, summary (international conference)  

  18. Current Limiting Characteristics of Parallel-connected Coated Conductors for High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT) International coauthorship International journal

    K. Omura, H. Kojima, N. Hayakawa, F. Endo, M. Noe, H. Okubo

    IEEE/CSC & ESAS European Superconductivity News Forum   ( 6 ) page: ST70   2008.10

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    Language:English   Publishing type:Research paper, summary (international conference)  

  19. The Challenge to a New Research Field Invited

    H. Kojima

    Journal of the Institute of Electrostatics Japan   Vol. 28 ( 4 )   2004.8

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Presentations 710

  1. 大規模再生可能エネルギー導入とGIS Invited

    小島寛樹

    電気学会電力・エネルギーフォーラム「ガス絶縁開閉装置に要求されるIT化融合技術と再生可能エネルギー対応技術の動向」  2022.6.29  電気学会電力・エネルギー部門開閉保護技術委員会

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    Event date: 2022.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:電気学会   Country:Japan  

  2. Expected Lifetime Evaluation of Oil-impregnated Paper Capacitor International conference

    M. Yoshida, Y. Nagaki, H. Kojima, N. Hayakawa

    21st IEEE International Conference on Dielectric Liquids  2022.6.2  IEEE DEIS

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    Event date: 2022.5 - 2022.6

    Language:English   Presentation type:Poster presentation  

    Venue:Seville   Country:Spain  

  3. Partial Discharge Progress and Breakdown Characteristics of Aluminum Foil/Oil-impregnated Paper Insulation System International conference

    N. Hayakawa, S. Wakita, Y. Nagaki, M. Yoshida, H. Kojima

    21st IEEE International Conference on Dielectric Liquids  2022.6.2  IEEE DEIS

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    Event date: 2022.5 - 2022.6

    Language:English   Presentation type:Poster presentation  

    Venue:Seville   Country:Spain  

  4. 多端子直流送電システムにおける超電導限流器の限流効果および過渡安定度向上効果

    村上雅紀,小島寛樹,早川直樹

    令和4年電気学会全国大会  2022.3.22  電気学会

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  5. 不平等電界下におけるCO2/N2混合ガス中絶縁破壊メカニズムの混合比依存性

    尾﨑脩平,小島寛樹,早川直樹

    令和4年電気学会全国大会  2022.3.23  電気学会

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  6. 電動推進航空機用モータの高出力密度化に向けた潤滑油中コイルモデルの部分放電開始特性

    鎌田泰任,脇田周太,小島寛樹,有賀信雄,卯辰清志,渡邉瞬也,早川直樹

    令和4年電気学会全国大会  2022.3.21  電気学会

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  7. 油浸紙コンデンサの期待寿命評価の検討

    永木雄也,小島寛樹,吉田昌展,早川直樹

    令和4年電気学会全国大会  2022.3.21  電気学会

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  8. 油浸紙コンデンサの期待寿命評価の検討

    脇田周太,林恭平,永木雄也,小島寛樹,吉田昌展,早川直樹

    令和4年電気学会全国大会  2022.3.21  電気学会

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  9. 放電開始条件を考慮したFGM絶縁スペーサの誘電率分布逆求解計算

    加藤克巳,小島寛樹,早川直樹,増井秀好,柳瀬博雅,岡本健次,大久保仁

    令和4年電気学会全国大会  2022.3.23  電気学会

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  10. 実器サイズGIS用ε-FGMスペーサにおける絶縁破壊特性の理論的検討

    加藤拓夢,小島寛樹,加藤克巳,大久保仁,足立和郎,岡本健次,早川直樹

    令和4年電気学会全国大会  2022.3.23  電気学会

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  11. Discharge Inception Voltage Improvement by Application of Permittivity and Conductivity Graded Materials (ε/σ-FGM) to HVDC GIS Spacer

    Rachmawati, H. Kojima, K. Kato, N. Hayakawa

    The 2022 Annual Meeting of the Institute of Electrical Engineers of Japan  2022.3.23  Institute of Electrical Engineers of Japan

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    Event date: 2022.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:online   Country:Japan  

  12. 真空中コンディショニング飽和時の絶縁耐力に及ぼす放電電荷量と対向電極材料付着の影響

    北直樹,小島寛樹,福田英昭,山村健太,早川直樹

    令和4年電気学会全国大会  2022.3.21  電気学会

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  13. 真空中高周波交流コンディショニングにおける多重絶縁破壊に関する考察

    小名木良太,小島寛樹,飯塚伸介,小林将人,早川直樹

    令和4年電気学会全国大会  2022.3.21  電気学会

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  14. 異種材料が対向する電極の真空中コンディショニングにおける絶縁耐力と材料付着の放電電荷量依存性

    北直樹,小島寛樹,福田英昭,山村健太,早川直樹

    電気学会誘電・絶縁材料/放電・プラズマ・パルスパワー/高電圧合同研究会  2022.1.21  電気学会 誘電・絶縁材料技術委員会,放電・プラズマ・パルスパワー技術委員会,高電圧技術委員会

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    Event date: 2022.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  15. CO2/N2混合ガス中におけるチャネル加熱絶縁破壊電圧

    尾﨑脩平,小島寛樹,早川直樹

    令和3年(2021年)放電学会年次大会  2021.12.3  放電学会

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    Event date: 2021.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  16. 真空中固体絶縁物上における帯電分布形状が沿面放電電圧に与える影響

    渡會凌平,小島寛樹,早川直樹

    令和3年(2021年)放電学会年次大会  2021.12.3  放電学会

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    Event date: 2021.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  17. Flashover Voltage Estimation of Cone-type GIS Spacer with Permittivity Graded Materials (ε-FGM) by Volume-Time Theory in Consideration with Conductor Surface Roughness in SF6 Gas Invited International conference

    N. Hayakawa, Y. Miyazaki, H. Kojima, K. Kato, H. Okubo, K. Adachi, K. Okamoto

    22nd International Symposium on High Voltage Engineering  2021.11.23  Xi'an Jiaotong University, State Key Laboratory of Electrical Insulation and Power Equipment, China Electrotechnical Society, Engineering Dielectrics Technical Committee, China Society for Electrical Engineering, Chinese National Committee of CIGRE, High Voltage Technical Committee and The International Council on Large Electric Systems

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Xi'an   Country:China  

  18. Inverse Analysis of Optimum Permittivity Distribution for FGM Spacer in Consideration with Multiple Objective Functions in Gaseous Insulation System International conference

    K. Kato, H. Kojima, N. Hayakawa, H. Masui, H. Yanase, K. Okamoto, H. Okubo

    22nd International Symposium on High Voltage Engineering  2021.11.24  Xi'an Jiaotong University, State Key Laboratory of Electrical Insulation and Power Equipment, China Electrotechnical Society, Engineering Dielectrics Technical Committee, China Society for Electrical Engineering, Chinese National Committee of CIGRE, High Voltage Technical Committee and The International Council on Large Electric Systems

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    Event date: 2021.11

    Language:English   Presentation type:Poster presentation  

    Venue:Xi'an   Country:China  

  19. Time Transition of Gas Conductivity and Charge Behavior in SF6-Epoxy Composite Insulation System Under DC Partial Discharge International conference

    R. Nakane, H. Kojima, N. Hayakawa

    22nd International Symposium on High Voltage Engineering  2021.11.24  Xi'an Jiaotong University, State Key Laboratory of Electrical Insulation and Power Equipment, China Electrotechnical Society, Engineering Dielectrics Technical Committee, China Society for Electrical Engineering, Chinese National Committee of CIGRE, High Voltage Technical Committee and The International Council on Large Electric Systems

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    Event date: 2021.11

    Language:English   Presentation type:Poster presentation  

    Venue:Xi'an   Country:China  

  20. Application of SiC-filled Permittivity and Conductivity Graded Material (ε/σ-FGM) in HVDC GIS Spacer International coauthorship International conference

    Rachmawati, H. Kojima, K. Kato, N. Zebouchi, N. Hayakawa

    22nd International Symposium on High Voltage Engineering  2021.11.24  Xi'an Jiaotong University, State Key Laboratory of Electrical Insulation and Power Equipment, China Electrotechnical Society, Engineering Dielectrics Technical Committee, China Society for Electrical Engineering, Chinese National Committee of CIGRE, High Voltage Technical Committee and The International Council on Large Electric Systems

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Xi'an   Country:China  

  21. Discrimination of Discharge Pattern in Cut Model of Vacuum Interrupter International conference

    H. Kojima, T. Donen, T. Kimura, K. Kokura, N. Hayakawa

    29th International Symposium on Discharges and Electrical Insulation in Vacuum  2021.9.28  Consorzio RFX

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    Event date: 2021.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Padova (virtual)   Country:Italy  

    DOI: 10.1109/ISDEIV46977.2021.9586961

  22. Anode Material Adhesion to Cathode during Spark Conditioning Process in Vacuum International conference

    N. Kita, H. Kojima, H. Fukuda, M. Sakaki, N. Hayakawa

    29th International Symposium on Discharges and Electrical Insulation in Vacuum  2021.9.27  Consorzio RFX

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    Event date: 2021.9

    Language:English   Presentation type:Poster presentation  

    Venue:Padova   Country:Italy  

    Spark conditioning is an effective method to improve electrical insulation strength of vacuum circuit breakers. In the conditioning process, defects on cathode surface are removed by repetitive breakdowns (BDs). However, we have elucidated that at the same time, micro-protrusions can be generated on the cathode surface by the adhesion of melted particles of anode material. In this paper, we discuss the relationship between the anode material adhesion to cathode and the conditioning saturation from an experimental approach. We set rod-plane electrodes made of Cu and stainless steel (SUS) in a vacuum chamber. We conduct spark conditioning by repetitive impulse voltages for several pairs of Cu and SUS electrodes. To one pair, the voltage is applied until the conditioning saturation. To the others, the smaller number of voltages before conditioning saturation is applied. After that, we observe the surface of rod cathodes with a digital microscope. As a result, we observe protrusion-like adhesion of the anode material to the cathode surface after conditioning saturation. On the other hand, we confirm coat-like adhesion of the anode material to the cathode surface before conditioning saturation. From these results, it is considered that coat-like adhesion mainly occur up to the saturation voltage, and then protrusion-like adhesion occur due to BD at the saturation voltage level. In other words, the generation of micro-protrusions can be a dominant factor of conditioning saturation process in vacuum.

    DOI: 10.1109/ISDEIV46977.2021.9586907

    Scopus

  23. Dielectric Strength Improvement by Higher Frequency AC Conditioning International conference

    R. Konagi, H. Kojima, S. Iitsuka, M. Kobayashi, N. Hayakawa

    29th International Symposium on Discharges and Electrical Insulation in Vacuum  2021.9.28  Consorzio RFX

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    Event date: 2021.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Padova   Country:Italy  

    We discuss the effects of AC conditioning with higher frequency on the dielectric strength in vacuum. We have confirmed that multiple breakdowns occur in a half cycle of AC voltage application in the AC conditioning process. It is considered that the multiple breakdowns are triggered by metal vapor due to the previous breakdown in the same half cycle. Such breakdowns can not be attributed to a micro protrusion on the electrode surface. Therefore, multiple breakdowns are considered not effective, but harmful for conditioning. In this paper, we carried out the AC conditioning with the higher frequency than the commercial power frequency in the sphere-plane electrode system. We experimentally confirmed that the conditioning effect is improved by increasing the frequency of AC conditioning in the sphere-plane electrode system, where multiple or harmful breakdowns were suppressed during AC conditioning. These results suggest the feasibility of higher frequency AC conditioning for the dielectric strength improvement in vacuum.

    DOI: 10.1109/ISDEIV46977.2021.9586929

    Scopus

  24. アルミ箔/油浸紙複合絶縁系における部分放電開始・進展・絶縁破壊特性

    脇田周太,永木雄也,小島寛樹,吉田昌展,早川直樹

    第52回電気電子絶縁材料システムシンポジウム  2021.9.14  電気学会誘電・絶縁材料技術委員会

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    Event date: 2021.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:オンライン   Country:Japan  

  25. Theoretical Investigation on Discharge Inception Voltage Improvement of SiC-filled Permittivity and Conductivity Graded Material (ε/σ-FGM) for HVDC GIS International coauthorship

    Rachmawati, H. Kojima, K. Kato, N. Zebouchi, N. Hayakawa

    52nd Symposium on Electrical and Electronic Insulating Materials and Applications in Systems  2021.9.14  IEEJ Technical Committee on Dielectrics and Electrical Insulation

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    Event date: 2021.9

    Language:English   Presentation type:Poster presentation  

    Venue:WEB   Country:Japan  

  26. 電動推進航空機用モータにおける潤滑油絶縁の適用可能性

    鎌田泰任,脇田周太,小島寛樹,有賀信雄,卯辰清志,渡邉瞬也,早川直樹

    第52回電気電子絶縁材料システムシンポジウム  2021.9.14  電気学会誘電・絶縁材料技術委員会

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    Event date: 2021.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:オンライン   Country:Japan  

  27. X線CTを用いた誘電率傾斜機能材料(ε-FGM)の誘電率分布測定

    加藤拓夢,小島寛樹,柳瀬博雅,岡本健次,早川直樹

    令和三年度電気・電子・情報関係学会東海支部連合大会  2021.9.8  電気学会東海支部,電子情報通信学会東海支部,情報処理学会東海支部,照明学会東海支部,映像情報メディア学会東海支部,日本音響学会東海支部,IEEE名古屋支部

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学(オンライン開催)   Country:Japan  

  28. 真空中におけるコンディショニングと放電電荷量の相関

    北直樹,小島寛樹,福田英昭,榊正幸,早川直樹

    令和三年度電気・電子・情報関係学会東海支部連合大会  2021.9.7  電気学会東海支部,電子情報通信学会東海支部,情報処理学会東海支部,照明学会東海支部,映像情報メディア学会東海支部,日本音響学会東海支部,IEEE名古屋支部

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学(オンライン開催)   Country:Japan  

  29. 真空中高周波交流コンディショニングにおける放電の電子温度

    小名木良太,小島寛樹,飯塚伸介,小林将人,早川直樹

    令和三年度電気・電子・情報関係学会東海支部連合大会  2021.9.7  電気学会東海支部,電子情報通信学会東海支部,情報処理学会東海支部,照明学会東海支部,映像情報メディア学会東海支部,日本音響学会東海支部,IEEE名古屋支部

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学(オンライン開催)   Country:Japan  

  30. アルミ箔/油浸紙複合絶縁系における部分放電発光の電圧依存性

    脇田周太,永木雄也,小島寛樹,吉田昌展,早川直樹

    令和三年度電気・電子・情報関係学会東海支部連合大会  2021.9.7  電気学会東海支部,電子情報通信学会東海支部,情報処理学会東海支部,照明学会東海支部,映像情報メディア学会東海支部,日本音響学会東海支部,IEEE名古屋支部

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学(オンライン開催)   Country:Japan  

  31. 電動推進航空機用モータに向けた潤滑油の絶縁破壊基礎特性

    鎌田泰任,脇田周太,小島寛樹,有賀信雄,卯辰清志,渡邉瞬也,早川直樹

    令和三年度電気・電子・情報関係学会東海支部連合大会  2021.9.7  電気学会東海支部,電子情報通信学会東海支部,情報処理学会東海支部,照明学会東海支部,映像情報メディア学会東海支部,日本音響学会東海支部,IEEE名古屋支部

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学(オンライン開催)   Country:Japan  

  32. CO2/N2混合ガス中におけるチャネル加熱絶縁破壊発生電圧

    尾﨑脩平,小島寛樹,早川直樹

    令和三年度電気・電子・情報関係学会東海支部連合大会  2021.9.7  電気学会東海支部,電子情報通信学会東海支部,情報処理学会東海支部,照明学会東海支部,映像情報メディア学会東海支部,日本音響学会東海支部,IEEE名古屋支部

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学(オンライン開催)   Country:Japan  

  33. 真空中固体絶縁物上における帯電分布形状が沿面放電電圧に与える影響

    渡會凌平,小島寛樹,早川直樹

    令和三年度電気・電子・情報関係学会東海支部連合大会  2021.9.7  電気学会東海支部,電子情報通信学会東海支部,情報処理学会東海支部,照明学会東海支部,映像情報メディア学会東海支部,日本音響学会東海支部,IEEE名古屋支部

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知工業大学(オンライン開催)   Country:Japan  

  34. Discharge Inception Voltage Calculation of HVDC GIS with Graded Permittivity and Conductivity (ε/σ-FGM) Spacer

    Rachmawati, H. Kojima, K. Kato, N. Hayakawa

    2021 Tokai-Section Joint Conference on Electrical, Electronics, Information, and Related Engineering  2021.9.8 

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    Event date: 2021.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Aichi Institute of Technology (Online)   Country:Japan  

  35. 真空中高周波交流コンディショニングによる耐圧向上効果 ~放電発光スペクトルからみた考察~

    小名木良太,小島寛樹,飯塚伸介,小林将人,早川直樹

    令和3年電気学会基礎・材料・共通部門大会  2021.9.3  電気学会基礎・材料・共通部門

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  36. 誘電率傾斜機能材料(ε-FGM)における誘電率分布の非破壊測定

    加藤拓夢,小島寛樹,柳瀬博雅,岡本健次,早川直樹

    令和3年電気学会基礎・材料・共通部門大会  2021.9.3  電気学会基礎・材料・共通部門

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  37. 真空中におけるコンディショニング過程で生成する微小突起サイズ

    北直樹,小島寛樹,福田英昭,榊正幸,早川直樹

    令和3年電気学会電力・エネルギー部門大会  2021.8.26  電気学会電力・エネルギー部門

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    Event date: 2021.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  38. 繰り返しサージ電圧下のエナメル線の部分放電開始電圧における湿度および気圧依存性

    林亮平,小島寛樹,早川直樹

    令和3年電気学会全国大会  2021.3.11  電気学会

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  39. 真空中コンディショニングの飽和過程における対向電極材料の付着

    北直樹,小島寛樹,福田英昭,榊正幸,早川直樹

    令和3年電気学会全国大会  2021.3.10  電気学会

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  40. 真空中高周波交流コンディショニングにおける多重絶縁破壊の抑制による耐圧向上効果

    小名木良太,小島寛樹,飯塚伸介,小林将人,早川直樹

    令和3年電気学会全国大会  2021.3.10  電気学会

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  41. Electric Field Grading on HVDC GIS Spacer by SiC-filled Permittivity and Conductivity Graded Material (ε/σ-FGM)

    Rachmawati, H. Kojima, K. Kato, N. Hayakawa

    The 2021 Annual Meeting of the Institute of Electrical Engineers of Japan  2021.3.11  IEEJ

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    Event date: 2021.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:online   Country:Japan  

  42. SF6ガス中FGM絶縁スペーサの最適絶縁性能を目指した誘電率分布逆求解技術

    加藤克巳,小島寛樹,早川直樹,増井秀好,柳瀬博雅,岡本健次,大久保仁

    令和3年電気学会全国大会  2021.3.11  電気学会

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  43. 超電導パンケーキコイルの対地絶縁モデルにおける液体窒素の動的絶縁破壊特性

    森優次,村上雅紀,小島寛樹,早川直樹

    令和3年電気学会全国大会  2021.3.11  電気学会

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  44. アルミ箔/油浸紙複合絶縁系における部分放電および絶縁破壊特性

    脇田周太,小島寛樹,吉田昌展,早川直樹

    令和3年電気学会全国大会  2021.3.9 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  45. SF6ガス/エポキシ複合絶縁系の直流部分放電下におけるガス中導電率分布の時間推移

    中根龍一,小島寛樹,早川直樹

    令和3年電気学会全国大会  2021.3.11 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  46. Diagnosis of Discharge Pattern in Vacuum Interrupter by Shield Potential Measurement International conference

    H. Kojima, T. Donen, T. Kimura, N. Hayakawa

    8th International Conference on Condition Monitoring and Diagnosis  2020.10.28  Department of Electrical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang

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    Event date: 2020.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:King Mongkut's Institute of Technology Ladkrabang   Country:Thailand  

    In vacuum discharge, we found that the discharge developing time depends only upon the discharge path length in the case of gap discharge, whereas it is in inverse proportion to the square of the discharge inception voltage in the case of surface flashover. Based on the database for fundamental electrode configuration, we have proposed a diagnosing method of discharge pattern in vacuum interrupter (VI). In this paper, we applied the diagnosing method to an actual VI model and verified the effectiveness of the method. We measured the applied voltage and the shield potential with voltage dividers and the discharge current with high-frequency current transformer. We also captured the still image of discharge by a digital camera to verify the discharge path in the VI model with an observation aperture. By changing the electrode configuration in the VI model, we observed the various discharge patterns, e.g. the gap discharge between contacts, the surface flashover on the solid insulator through the shield, and the combination of them. Experimental results revealed that we succeeded in diagnosing the discharge pattern with the validity higher than 90%.

    DOI: 10.1109/CMD48350.2020.9287205

    Scopus

  47. Pressure Dependence of Quench-induced Dynamic Breakdown Characteristics of HTS Pancake Coil Model for Resistive SFCL International conference

    N. Hayakawa, Y. Mori, H. Kojima

    Applied Superconductivity Conference 2020  2020.11.4 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:virtual conference   Country:United States  

  48. Dielectric Characteristics of Liquid Nitrogen / Synthetic Paper Composite Insulation System for Extra High Voltage HTS Cable International conference

    N. Hayakawa, K. Yamakami, T. Masuda, H. Kojima

    Applied Superconductivity Conference 2020  2020.11.3 

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    Event date: 2020.10 - 2020.11

    Language:English   Presentation type:Poster presentation  

    Venue:virtual conference   Country:United States  

  49. Time Transition of Conductivity Distribution in Air by DC Partial Discharge for Air-solid Composite Insulation Systems International conference

    R. Nakane, H. Kojima, J. Suehiro, H. Okubo, N. Hayakawa

    IEEE Conference on Electrical Insulation and Dielectric Phenomena 2020  2020.10.20  IEEE DEIS

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    Event date: 2020.10

    Language:English   Presentation type:Poster presentation  

    Venue:virtual conference   Country:United States  

    Toward the development of HVDC power apparatus, we investigate the charging process on solid insulator in terms of the time transition of conductivity distribution in air for air-solid composite insulation system from DC-on to DC steady-state. By using needle-air-PMMA-plane electrode configuration, we measure the time evolution of surface potential on PMMA due to partial discharge at the needle tip under negative DC voltage. We compare the measured surface potential distribution with the simulation result considering the charge behavior in air. Especially, a novel simulation model considering the charge supply due to DC partial discharge is built. As a result, in air-solid composite insulation system under negative DC application, the time transition of conductivity distribution in air corresponding to the charge accumulation is evaluated quantitatively.

    DOI: 10.1109/CEIDP49254.2020.9437492

    Scopus

  50. 電力機器内部アーク発生時の高温ガスによる周囲への熱的影響解析

    神足将司,岩田幹正,田所兼,田中慎一,小島寛樹,早川直樹

    電気学会放電・プラズマ・パルスパワー/静止器/開閉保護合同研究会  2020.9.28 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  51. Breakdown Characteristics of Cone-type ε-FGM Spacer for Gas Insulated Switchgears International conference

    Y. Miyazaki, A. Izu, Z. Liang, H. Kojima, H. Masui, H. Mitsudome, H. Yanase, K. Okamoto, K. Watanabe, K. Kato, N. Hayakawa

    9th International Symposium on Electrical Insulating Materials  2020.9.14  IEEJ Technical Committee on Dielectrics and Electrical Insulation

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    Event date: 2020.9

    Language:English  

    Venue:virtual web conference   Country:Japan  

    For the downsizing of gas insulated switchgears (GIS), a novel electric field grading technique is highly expected. In order to meet this demand, we have been investigating the electric field control and relaxation technique by "functionally graded materials" with the spatial distribution of permittivity (e-FGM). In this paper, we fabricated the 1/4-sized cone-type e-FGM spacer for 245 kV-class GIS and verified its breakdown voltage improvement effect by both experiment and simulation.

    Scopus

  52. Conductivity Distribution in Air by Charging Process on Solid Dielectrics under DC Voltage International conference

    R. Nakane, H. Kojima, N. Hayakawa, H. Okubo

    9th International Symposium on Electrical Insulating Materials  2020.9.14  IEEJ Technical Committee on Dielectrics and Electrical Insulation

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    Event date: 2020.9

    Language:English  

    Venue:virtual web conference   Country:Japan  

    The enhancement of DC electrical insulation performance is required for the reliable HVDC power equipment and bulk power transmission in recent years. In this paper, we measure the charging process on PMMA in air under DC steady-state and investigate the space distribution of the conductivity in air by using needle-air-PMMA-plane electrode configuration. In order to sfmulate the space distribution of the conductivity in air under DC steady-state, the charge transport equations in air considering the generation, recombination and motion of positive and negative ions are solved. We calculate the space distribution of the conductivity in air activated by partial discharge. As a result, it is quantitatively estimated that highly conductive area in air with approximately 106 times higher conductivity than the other area is formed along the electric line of force from the needle electrode tip as the source of charge carrier.

    Scopus

  53. Carbonization Phenomena Dependence on Pressure between Insulation Sheets by Steeper Inverter Surge at Inverter Fed Motor International conference

    Y. Yoshitake, H. Kojima, Y. Kasai, S. Maruyama, H. Kojima, N, Hayakawa

    9th International Symposium on Electrical Insulating Materials  2020.9.14  IEEJ Technical Committee on Dielectrics and Electrical Insulation

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    Event date: 2020.9

    Language:English  

    Venue:virtual web conference   Country:Japan  

    Recently, "carbonization phenomena on the insulation sheets" were newly detected as the unique precursor phenomena to the burning of the insulation of inverter-fed motors due to leakage current through the insulation system. We have previously studied the generation condition for the high dV/dt resulting in an inverter surge. In this study, we built an experimental setup based on an elemental model to simulate a steep surge voltages in the inverter and constructed the stator insulation inside the motor core to control the pressure between the insulation sheets. This paper reports the carbonization characteristics and the insulation design to prevent the carbonization caused by steep inverter surges.

    Scopus

  54. Electric Field Grading by Permittivity and Conductivity Graded Materials (ε/σ-FGM) for HVDC Gas Insulated Power Apparatus International coauthorship International conference

    Rachmawati, A. Izu, R. Nakane, H. Kojima, K. Kato, N. Zebouchi, N. Hayakawa

    9th International Symposium on Electrical Insulating Materials  2020.9.14  IEEJ Technical Committee on Dielectrics and Electrical Insulation

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    Event date: 2020.9

    Language:English  

    Venue:virtual web conference   Country:Japan  

    The progressive development of HVDC transmission system has urged us to develop a novel technique in supporting the performance of DC power apparatus. Functionally Graded Materials (FGM) are one of the techniques that allows us to control the electric field within the DC insulation system. Our previous work has reported that FGM with spatial conductivity distribution applied to a 320 kV DC-GIS spacer could reduce the maximum electric field under DC steady state condition. This paper investigates the applicability of the combination of spatial permittivity and conductivity graded materials (e/s-FGM) in DC power apparatus. ? / S - F G M are revealed to be more effective in suppressing maximum electric field as well as more uniformly distributed electric field against the increase of temperature distribution under polarity reversal, DC-on, and impulse superimposed on DC condition.

    Scopus

  55. 真空中コンディショニング過程で生成される微小突起サイズ

    北直樹,近藤史規,小島寛樹,福田英昭,榊正幸,早川直樹

    令和2年電気学会電力・エネルギー部門大会  2020.9.11 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  56. 超電導限流器の動的絶縁破壊特性における体積効果

    森優次,小島寛樹,早川直樹

    令和2年電気学会電力・エネルギー部門大会  2020.9.11 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  57. 実機サイズGISスペーサへのε-FGM(誘電率傾斜機能材料)の適用

    宮崎勇作,小島寛樹,早川直樹,加藤克巳,匹田政幸,大久保仁,渡辺桂司,岡本健次,足立和郎

    令和2年電気学会電力・エネルギー部門大会  2020.9.10 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  58. ツイストペアの誘電損失によるエナメル皮膜温度上昇

    林亮平,梶武文,小島寛樹,早川直樹

    令和2年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  59. Electric Field Grading by Permittivity and Conductivity Graded Material (ε/σ-FGM) at Polarity Reversal for HVDC GIS

    Rachmawati, H. Kojima, K. Kato, N. Hayakawa

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    Event date: 2020.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  60. 超電導パンケーキコイルモデルにおける液体窒素の動的絶縁破壊電界の体積効果および熱流束依存性

    森優次,小島寛樹,早川直樹

    令和2年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  61. 導電率傾斜機能材料(σ-FGM)のコーン型GISスペーサへの適用効果

    梁照源,宮崎勇作,小島寛樹,加藤克巳,増井秀好,満留博,柳瀬博雅,岡本健次,早川直樹

    令和2年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  62. 可変配合注型法によるε-FGM(誘電率傾斜機能材料)を適用した実器サイズGISスペーサの誘電率分布測定

    宮崎勇作,小島寛樹,早川直樹,今井隆浩,染谷竜太,保科好一

    令和2年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  63. 油浸紙絶縁における部分放電検出センサの感度比較

    脇田周太,小島寛樹,吉田昌展,早川直樹

    令和2年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  64. 真空中高周波交流コンディショニングによる耐圧向上効果

    小名木良太,小島寛樹,飯塚伸介,小林将人,早川直樹

    令和2年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  65. 真空中コンディショニング過程における陰極への陽極材料の付着が飽和電圧に与える影響

    北直樹,小島寛樹,福田英昭,榊正幸,早川直樹

    令和2年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  66. 直流部分放電下の空気/固体複合絶縁系における空気中導電率分布の推移過程

    中根龍一,小島寛樹,大久保仁,早川直樹

    令和2年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  67. 誘電率傾斜機能材料(ε-FGM)を用いたGISスペーサモデルの作製とSF6ガス中絶縁破壊電圧の理論的推定 Invited

    宮路仁崇,小島寛樹,加藤克巳,早川直樹

    令和2年電気学会基礎・材料・共通部門大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  68. 空気/固体複合絶縁系の直流印加時における空気中導電率の時間推移

    中根龍一,小島寛樹,大久保仁,早川直樹

    令和2年電気学会基礎・材料・共通部門大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  69. 真空中沿面放電における初期帯電迂回条件

    西田歩成,小名木良太,小島寛樹,飯塚伸介,小林将人,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  70. 可変配合注型法による誘電率傾斜絶縁スペーサの樹脂分布可視化

    染谷竜太,保科好一,今井隆浩,小島寛樹,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  71. ツイストペアサンプルの部分放電開始電圧におけるエナメル皮膜の温度上昇

    林亮平,梶武文,小島寛樹,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  72. 空気中チャネル加熱絶縁破壊における電流増加および高導電率領域進展過程

    浅野竜大,小島寛樹,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  73. 空気/固体複合絶縁系の直流定常状態における空気中導電率の空間分布

    中根龍一,小島寛樹,早川直樹,大久保仁

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  74. 真空中交流部分放電による帯電形成時における固体絶縁物上の二次電子放出係数の時間推移

    大木駿士朗,小島寛樹,竪山智博,浅利直紀,佐々木良輔,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  75. 超電導パンケーキコイルモデルにおける液体窒素の動的絶縁破壊特性の圧力依存性

    森優次,山上浩輝,小島寛樹,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  76. 真空中コンディショニング過程における対向電極材料の付着

    北直樹,近藤史規,小島寛樹,福田英昭,榊正幸,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  77. 真空中コンディショニングにおける陽極めっきの損耗

    近藤史規,北直樹,小島寛樹,鈴木飛鳥,小橋眞,福田英昭,榊正幸,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  78. ガス絶縁開閉装置向けコーン型ε-FGM(誘電率傾斜機能材料)スペーサの絶縁破壊特性

    宮崎勇作,伊豆淳宏,梁照源,小島寛樹,満留博,柳瀬博雅,岡本健次,渡辺桂司,加藤克巳,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  79. 導電率の温度・電界依存性を考慮した傾斜機能材料の直流ガス絶縁電力機器への適用効果

    伊豆淳宏,Rachmawati,中根龍一,小島寛樹,加藤克巳,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  80. 超高圧超電導ケーブルに向けた低誘電損失合成紙の電気絶縁特性

    山上浩輝,脇田周太,小島寛樹,増田孝人,早川直樹

    令和2年電気学会全国大会 

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    Event date: 2020.3

    Language:Japanese  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

  81. 超高圧超電導ケーブルに向けた液体窒素/合成紙複合絶縁系における部分放電開始特性

    山上浩輝,小島寛樹,増田孝人,早川直樹

    電気学会誘電・絶縁材料/放電・プラズマ・パルスパワー/高電圧合同研究会 

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    Event date: 2020.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三菱電機健康保険組合 湯布郷館   Country:Japan  

  82. 空気中チャネル加熱絶縁破壊における温度・電流上昇過程

    浅野竜大,小島寛樹,早川直樹

    電気学会誘電・絶縁材料/放電・プラズマ・パルスパワー/高電圧合同研究会 

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    Event date: 2020.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三菱電機健康保険組合 湯布郷館   Country:Japan  

  83. 真空インタラプタ開口モデルによる複合的な放電経路に対する診断手法の検証

    小島寛樹,道念大樹,木村俊則,小倉健太郎,早川直樹

    電気学会放電・プラズマ・パルスパワー/開閉保護/高電圧合同研究会 

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    Event date: 2019.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:伊勢市観光文化会館(シンフォニアテクノロジー響ホール伊勢)   Country:Japan  

  84. Analysis of the Characteristics of Pressure Rise and Exhausted Hot Gas due to Internal Arc Faults in SF6-Insulated Power Equipment International conference

    M. Kotari, T. Tadokoro, S. Tanaka, M. Iwata, H. Kojima, N. Hayakawa

    2019 5th International Conference on Electric Power Equipment - Switching Technology  2019.10.15  Nagoya University

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    Event date: 2019.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kitakyushu   Country:Japan  

    From an environmental perspective, when performing internal arc tests on SF6-insulated power equipment, SF6 may be replaced with air in accordance with the International Electrotechnical Commission standard. To develop an alternative method for internal arc testing in SF6-insulated power equipment, a specific procedure must be proposed to replace SF6 with air and select appropriate test parameters. Therefore, we have systematically obtained the experimental and analytical data of air and SF6 arcs to calculate the pressure rise in electric power equipment and the thermal effect of hot gas on the surroundings. The modeling of SF6-air and air-air flows is implemented using computational fluid dynamics to analyze the characteristics of pressure rise and exhausted hot gas due to internal arc faults in SF6-insulated power equipment.

    DOI: 10.1109/ICEPE-ST.2019.8928689

    Scopus

  85. Suppression of Conditioning Effect in Vacuum by Micro-protrusions from Anode International conference

    F. Kondo, H. Kojima, H. Fukuda, M. Sakaki, N. Hayakawa

    2019 5th International Conference on Electric Power Equipment - Switching Technology  2019.10.14  Nagoya University

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    Event date: 2019.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kitakyushu   Country:Japan  

    Spark conditioning is an effective method to improve electrical insulation strength of vacuum circuit breakers. We discuss the spark conditioning process in consideration of the generation of micro-protrusions on cathode surface by breakdown. We conducted the spark conditioning on three pairs of rod-plane electrodes made of OFHC Cu. For one pair, the voltages were applied until conditioning saturation, namely 600 times voltage applications. For the others, a smaller number of voltage applications (100 times and 300 times) before conditioning saturation were given. After these conditioning experiments, we observed the surface of rod cathodes with a microscope. After the conditioning by about 600 times voltage applications, many micro-protrusions appeared on the cathode surface. Some of them had a diameter larger than 20 m. They would be caused by adhesion of metallic particles from anode and remained through the conditioning process. On the other hand, few micro-protrusions were found on the cathodes with 100 and 300 times voltage applications. This means that the micro-protrusions were generated at the last period of the conditioning process. In other words, the generation of micro-protrusions can be a dominant factor of suppression and saturation of conditioning effect.

    DOI: 10.1109/ICEPE-ST.2019.8928772

    Scopus

  86. 誘電率/導電率傾斜機能材料を用いた直流ガス絶縁電力機器のインパルス重畳時における電界制御効果

    伊豆淳宏,中根龍一,小島寛樹,加藤克巳,早川直樹

    第50回電気電子絶縁材料システムシンポジウム 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:名古屋大学工学部IB電子情報館   Country:Japan  

  87. インバータサージ高峻度化により発生するカーボン遊離現象の検討

    吉武勇一郎,小島啓明,笠井友樹,丸山正一,小島寛樹,早川直樹

    第50回電気電子絶縁材料システムシンポジウム 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:名古屋大学工学部IB電子情報館   Country:Japan  

  88. 誘電率傾斜機能材料(ε-FGM)を用いたコーン型絶縁スペーサの絶縁破壊特性

    宮崎勇作,伊豆淳宏,小島寛樹,満留博,柳瀬博雅,岡本健次,渡辺桂司,加藤克巳,早川直樹

    第50回電気電子絶縁材料システムシンポジウム 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:名古屋大学工学部IB電子情報館   Country:Japan  

  89. IEEE 14母線モデルにおける複数の超電導限流器の限流協調

    森優次,小島寛樹,早川直樹

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  90. 直流電界下の空気/固体複合絶縁系における空気中導電率の空間分布

    中根龍一,小島寛樹,早川直樹,大久保仁

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  91. エナメル皮膜の誘電損失を考慮した部分放電開始電圧の繰り返し周波数依存性

    林亮平,梶武文,小島寛樹,早川直樹

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  92. 加圧空気中1次/2次ストリーマの絶縁破壊抑制/促進作用

    浅野竜大,小島寛樹,米須大吾,額賀淳,六戸敏昭,早川直樹

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  93. 真空中交流部分放電による固体絶縁物上の帯電進展特性の推移

    大木駿士朗,小島寛樹,竪山智博,浅利直紀,佐々木良輔,早川直樹

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  94. 真空中初期帯電存在時における陰極先端電界と沿面放電進展経路

    西田歩成,小島寛樹,飯塚伸介,小林将人,早川直樹

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  95. 真空中スパークコンディショニング過程における突起生成と飽和

    近藤史規,小島寛樹,福田英昭,榊正幸,早川直樹

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  96. 誘電率/導電率傾斜機能材料(ε/σ-FGM)の作製と放電開始電圧向上効果の検証

    宮崎勇作,小島寛樹,加藤克巳,満留博,柳瀬博雅,岡本健次,早川直樹

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  97. 直流高電圧印加時における傾斜機能材料の電界緩和の時間依存性

    伊豆淳宏,中根龍一,小島寛樹,加藤克巳,早川直樹

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  98. 超高圧超電導ケーブルに向けたTyvek®/PE/Tyvek®およびPPLP®の電気絶縁特性の圧力依存性

    山上浩輝,小島寛樹,増田孝人,早川直樹

    令和元年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大同大学   Country:Japan  

  99. FGM絶縁スペーサの誘電率逆求解自動計算技術の開発とその検証

    加藤克巳,小島寛樹,早川直樹,満留博,柳瀬博雅,岡本健次,大久保仁

    令和元年電気学会電力・エネルギー部門大会 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学 五日市キャンパス   Country:Japan  

  100. Fault Current Limitation Coordination of Multiple SFCLs in IEEE 14-Bus System International conference

    N. Hayakawa, Y. Mori, H. Kojima

    14th European Conference on Applied Superconductivity 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Glasgow   Country:United Kingdom  

  101. Quench-induced Breakdown Characteristics of HTS Pancake Coil for Resistive SFCL International conference

    N. Hayakawa, M. Mimbu, H. Kojima, S. Isojima, M. Kuwata

    14th European Conference on Applied Superconductivity 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

    Venue:Glasgow   Country:United Kingdom  

  102. Inverse Analysis of Permittivity Distribution of FGM (Functionally Graded Materials) Insulator in Gaseous Insulation System International conference

    K. Kato, H. Kojima, N. Hayakawa, H. Mitsudome, H. Yanase, K. Okamoto, H. Okubo

    21st International Symposium on High Voltage Engineering 

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    Event date: 2019.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Budapest   Country:Hungary  

  103. Modeling of Channel Heating Breakdown in Dry Air International conference

    H. Kojima, R. Asano, D. Komesu, J. Nukaga, T. Rokunohe, N. Hayakawa

    21st International Symposium on High Voltage Engineering  2019.8.27  Budapest University of Technology

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    Event date: 2019.8

    Language:English   Presentation type:Poster presentation  

    Venue:Budapest   Country:Hungary  

    In dry air with a relatively short gap length under non-uniform electric field, the channel heating breakdown mechanism becomes critical to the electrical insulation design of power apparatus. We have experimentally clarified that the input energy density into the discharge channel almost decides the occurrence of channel heating breakdown in dry air. This implies that the rise of the channel temperature due to Joule heating causes the rise of the channel conductivity and the current, leading to the breakdown. In this paper, we construct the discharge channel heating model by the resistance circuits in consideration of the temperature dependence of conductivity and the shape of discharge channel, and investigate the process leading to the channel heating breakdown in dry air. The electrode system in this model is needle-plane electrodes with the gap length of 15 mm based on our experiments. At first, we verified that the process of channel heating breakdown can be explained by the temperature dependence of conductivity by using the preliminary zero-dimensional model with uniform temperature distribution in the discharge channel. With the given applied voltage and initial temperature, the temporal evolution of current and conductivity was calculated. Calculation results revealed that the temporal evolution of conductivity and the time to breakdown were determined by not only the conductivity itself but also the temperature dependence of conductivity. Subsequently, we constructed the discharge channel heating model in consideration of the radial and axial temperature distribution. With the given initial temperature distribution, the calculated temporal evolution of current agreed with the measured current waveform just before breakdown. This result revealed that the temperature rise in the center column of discharge channel is the most important factor for the breakdown process. The calculated temporal evolution of the temperature distribution along the center axis revealed that the high temperature region would develop from the tip of the needle electrode toward the center of the gap. In addition, the calculated temporal evolution of the radial temperature distribution suggested that the temperature at the center column of the discharge channel would rise sharply just before breakdown. In conclusion, in the channel heating breakdown in dry air, we clarified the process of the current concentration on the center axis of the discharge channel, as well as the progress of high temperature region or high conductivity region in the axial direction from the tip of the needle electrode.

    DOI: 10.1007/978-3-030-31680-8_41

    Scopus

  104. 環境要因の相互作用を考慮したインバータサージ電圧下における部分放電開始電圧解析

    梶武文,浅井洋光,野須敬弘,小島寛樹,早川直樹

    電気学会放電・プラズマ・パルスパワー研究会 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:まちなかキャンパス長岡   Country:Japan  

  105. 空気中不平等電界下における2次ストリーマ発生条件

    浅野竜大,小島寛樹,米須大吾,額賀淳,六戸敏昭,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  106. 共通基盤技術としての高電圧絶縁技術の将来展望

    小島寛樹,五島久司,大久保仁

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:北海道科学大学   Country:Japan  

  107. 高電圧絶縁技術 -9つの核心技術から紐解く歴史と将来展望-

    五島久司,小島寛樹,大久保仁

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:北海道科学大学   Country:Japan  

  108. SF6ガス中におけるストリーマ/リーダ放電の放射電磁波特性

    余増強,小島寛樹,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  109. 真空中スパークコンディショニングにおける微小突起の生成および溶融可能性

    近藤史規,小島寛樹,福田英昭,榊正幸,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  110. 真空インタラプタ開口モデルにおける放電パターン診断の検証

    小島寛樹,道念大樹,木村俊則,小倉健太郎,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  111. 誘電率傾斜絶縁スペーサにおける流動解析により求めた樹脂分布の妥当性検証

    今井隆浩,竹内美和,保科好一,小島寛樹,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  112. FGM絶縁スペーサの誘電率分布逆求解に関する基礎検討

    加藤克巳,小島寛樹,早川直樹,満留博,柳瀬博雅,岡本健次,大久保仁

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  113. 可変配合注型法によるコーン型FGM絶縁スペーサの作製

    落合健太,伊豆淳宏,鳥前勇作,小島寛樹,加藤克巳,渡辺桂司,満留博,柳瀬博雅,岡本健次,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  114. 直流ガス絶縁電力機器の極性反転時における傾斜機能材料の電界制御効果

    伊豆淳宏,小島寛樹,加藤克巳,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  115. 超高圧超電導ケーブルの低誘電損失化に向けたTyvek®の電気絶縁特性の積層方法依存性

    山上浩輝,民部昌孝,小島寛樹,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  116. 超電導パンケーキコイルモデルのクエンチ時における液体窒素の動的絶縁破壊特性

    民部昌孝,森優次,小島寛樹,礒嶋茂樹,桑田稔,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  117. ツイストペアの部分放電開始電圧における温度および繰り返し周波数依存性

    大長勇輝,林亮平,梶武文,小島寛樹,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  118. 真空/正帯電固体絶縁物上における交流沿面放電進展特性

    大木駿士朗,小島寛樹,浅利直紀,竪山智博,佐々木良輔,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  119. 真空中沿面放電経路の初期帯電分布依存性

    西田歩成,小島寛樹,飯塚伸介,田中荘,早川直樹

    平成31年電気学会全国大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道科学大学   Country:Japan  

  120. ガス絶縁開閉装置の絶縁診断高度化に向けた部分放電の電磁波放射メカニズムの解明

    小島寛樹

    パワーアカデミー研究助成 2019年成果報告会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:北海道科学大学 A棟308   Country:Japan  

  121. 樹脂充填方法が絶縁スペーサの誘電率傾斜に与える影響 -有限体積法に基づく流体解析を用いた樹脂分布の推定-

    今井隆浩,保科好一,小島寛樹,早川直樹

    電気学会誘電・絶縁材料研究会 

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    Event date: 2018.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋駅前イノベーションハブ   Country:Japan  

  122. Dynamic Breakdown Characteristics of Pancake Coil Model for Resistive Superconducting Fault Current Limiters International conference

    N. Hayakawa, M. Mimbu, H. Kojima, S. Isojima, M. Kuwata

    2018 Applied Superconductivity Conference 

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    Event date: 2018.10 - 2018.11

    Language:English   Presentation type:Poster presentation  

    Venue:Seattle   Country:United States  

  123. Fabrication of Permittivity Graded Materials (ε-FGM) by Flexible Mixture Casting Method International conference

    K. Ochiai, A. Izu, R. Oishi, H. Kojima, H. Mitsudome, H. Yanase, K. Okamoto, K. Kato, N. Hayakawa

    2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena  2018.10.24 

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    Event date: 2018.10

    Language:English   Presentation type:Poster presentation  

    Venue:Cancun   Country:Mexico  

    DOI: 10.1109/CEIDP.2018.8544770

  124. Combined Effect of Temperature and Humidity of Magnet-Wires on Partial Discharge Inception Voltage under Inverter-Surge Voltage International conference

    T. Kaji, H. Asai, H. Kojima, N. Hayakawa

    2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena  2018.10.24  IEEE DEIS

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    Event date: 2018.10

    Language:English   Presentation type:Poster presentation  

    Venue:Cancun   Country:Mexico  

    We investigated the combined effect of temperature and humidity on partial discharge inception voltage (PDIV) of magnet wires under repetitive surge-wave voltages. As the results, the PDIV increased as the temperature increased under uncontrolled humidity, which is peculiar under surge-wave voltage. On the other hand, the PDIV decreased lineally as the temperature increased under controlled humidity. From these results, we found that the PDIV increase under uncontrolled humidity was attributed to the effect of the relative humidity decrease corresponding to the temperature increase. Furthermore, the PDIV was also influenced by the moisture amount in insulation film. Under uncontrolled humidity, the PDIV during the temperature increase was lower than that during the temperature decrease with the hysteresis. We found two reasons for the PDIV hysteresis. One reason is the humidity increase in the air gap due to moisture evaporation from the film. Another reason is the electron emission from the film with the lower first ionization energy. Based on the above reasons, the generation probability of initial electrons during the temperature increase is higher than that during the temperature decrease, which decreases PDIV.

    DOI: 10.1109/CEIDP.2018.8544745

    Scopus

  125. Electric Field Grading by Functionally Graded Materials (FGM) for HVDC Gas Insulated Power Apparatus International coauthorship International conference

    N. Hayakawa, R. Oishi, H. Kojima, K. Kato, N. Zebouchi

    2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena  2018.10.23  IEEE DEIS

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    Event date: 2018.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Cancun   Country:Mexico  

    Functionally graded materials (FGM) have been investigated as innovative field grading and control techniques for gas insulated power apparatus such as gas insulated switchgears (GIS) and gas insulated transmission lines (GIL). We have so far verified that FGM with the spatial permittivity distribution can control the electric field distribution around GIS spacers under AC and impulse voltage stresses. In this paper, we proposed the new application of FGM for HVDC power apparatus (DC-FGM) and investigated the technical feasibility of the electric field control by DC-FGM. The calculation results revealed that DC-FGM with the spatial conductivity distribution in the spacer bulk can control the electric field distribution around the spacer in consideration of the temperature distribution under DC voltage stress.

    DOI: 10.1109/CEIDP.2018.8544834

    Scopus

  126. Estimation of Partial Discharge Inception Voltage under Repetitive Inverter Surge Voltage by Volume-Time Theory International conference

    N. Hayakawa, Y. Daicho, T. Kaji, H. Kojima

    2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena  2018.10.24  IEEE DEIS

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    Event date: 2018.10

    Language:English   Presentation type:Poster presentation  

    Venue:Cancun   Country:Mexico  

    We measured the repetition frequency dependence of partial discharge inception voltage (PDIV) of twisted-pair test samples with different specifications under repetitive surge voltages with different waveforms. We also extended the PDIV estimation method with Volume-Time theory under single shot of surge voltage to that under repetitive surge voltage, in consideration of the effect of the repetition frequency on the initial electrons generation probability. The estimated and measured PDIV agreed well under repetitive surge voltage.

    DOI: 10.1109/CEIDP.2018.8544814

    Scopus

  127. Effect of Initial Electrode Surface and Breakdown Charge on Spark Conditioning in Vacuum under Non-Uniform Electric Field International conference

    H. Kojima, M. Noda, H. Fukuda, M. Sakaki, N. Hayakawa

    28th International Symposium on Discharges and Electrical Insulation in Vacuum  2018.9.25  Leibniz Institute for Plasma Science and Technology and University of Greifswald – Institute of Physics

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    Event date: 2018.9

    Language:English   Presentation type:Poster presentation  

    Venue:Greifswald   Country:Germany  

    We discuss the effect of initial cathode surface and breakdown (BD) charge on spark conditioning in a rod-plane electrode system, especially with suppressed BD charge. In the case of Cu rod cathode vs. stainless steel plane anode with a large BD charge, the saturated 50% BD field strength at the cathode tip was independent of the initial cathode surface condition, because the large BD charge led to sufficiently large melting of the cathode surface. However, in the case with suppressed BD charge not enough to remove the large weak points, the saturated BD field strength depended on the initial cathode surface condition. On the other hand, in the case of stainless steel rod cathode vs. stainless steel plane anode, the saturated BD field strength was independent of the initial cathode surface condition. In this case, the anode heating would mainly initiate BD. Since the melting of anode was the starting point of BD, the saturated BD field strength would not depend on the initial cathode surface condition regardless of BD charge.

    DOI: 10.1109/DEIV.2018.8537140

    Scopus

  128. Mechanism behind Increasing Electrostatic Charging Tendency in Aged Mineral-Oil-Immersed Pressboards International conference

    H. Morooka, A. Yamagishi, K. Kawamura, H. Kojima, N. Hayakawa

    2018 International Conference on Condition Monitoring and Diagnosis   2018.9.25  Curtin University

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    Event date: 2018.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Perth   Country:Australia  

    The surface chemical properties of aged pressboards (PBs) were evaluated to investigate the mechanism behind the increasing tendency of electrostatic charges for diagnosing power transformers. The PBs were taken from several aged transformers, and their surface elemental composition and chemical structures were measured by X-ray photoelectron spectroscopy. The PBs properties were measured after being washed by an organic solvent to remove impregnated mineral oil. Carbon (C) and oxygen (O) atoms were mostly observed on virgin PBs surfaces; these are the atoms that compose cellulose polymer, the main component of kraft pulp. In contrast, sulfur (S) and calcium (Ca) atoms were observed on the surfaces of aged PBs in addition to the C and O atoms. Moreover, the surface densities of the Ca atoms had a good correlation with those of the S atoms. While we detected no S atoms inside the aged PBs, we observed almost the same amount of Ca atoms as in the virgin PBs. Mineral oils mainly consist of hydrocarbons, with very small amounts of components such as sulfur compounds derived from crude oil. Heat stress degrades these sulfur compounds. On the other hand, PBs made of kraft pulp contain a very small amount of metal ions, such as Ca ions. We conclude that S atoms observed on aged PB surfaces are a part of the aged sulfur compounds adsorbed from the mineral oil. The adsorption of aged sulfur compounds induced the migration of Ca ions from the inside of the PBs to the surface, which caused the surface density of the Ca ions to increase. This suggests that the accumulation of Ca ions along with the sulfur compounds led to the increasing tendency of electrostatic charges in aged PBs.

    DOI: 10.1109/CMD.2018.8535704

    Scopus

  129. Thermal-Degradation Mechanism of Mineral-Oil-Immersed Pressboards and Influence of Aging on Pressboard Properties International conference

    H. Morooka, A. Yamagishi, K. Kawamura, H. Kojima, N. Hayakawa

    2018 International Conference on Condition Monitoring and Diagnosis  2018.9.25  Curtin University

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    Event date: 2018.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Perth   Country:Australia  

    The effects of thermal degradation and aging on the properties of mineral-oil-immersed pressboards (PBs) were studied from the viewpoint of diagnosis of power transformers. Specifically, thickness, degree of polymerization (DP), and compressive properties of oil-immersed PBs after heat-accelerated degradation in sealed containers were evaluated. The degree of crystallization (Cr) of oil-immersed PBs was then evaluated by X-ray diffraction (XRD). The evaluation results revealed that after thermal aging, DP decreased. Moreover, thickness, compressive elasticity modulus, and hysteresis loss ratio slightly decreased. Conversely, Cr slightly increased. DP of kraft paper is known to decrease after aging. Simultaneously, several compounds with low molecular weight, such as CO, CO2, and furfurals, are generated, and the tensile strength of kraft paper decreases. It is therefore assumed here that the thickness of PBs decreases very little as they generate low-molecular-weight decomposition compounds and that the decrease in DP causes a slight decrease in the compressive elasticity modulus, E. However, an increase in Cr causes a slight increase in E. As a result, the overall decrease in E is slight.

    DOI: 10.1109/CMD.2018.8535770

    Scopus

  130. 超電導限流器の絶縁設計における液体窒素の動的絶縁破壊特性

    民部昌孝,山上浩輝,小島寛樹,礒嶋茂樹,桑田稔,早川直樹

    平成30年電気学会電力・エネルギー部門大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学 常三島キャンパス   Country:Japan  

  131. 可変配合注型法による誘電率傾斜機能材料の作製および放電開始電圧向上効果

    落合健太,伊豆淳宏,小島寛樹,満留博,柳瀬博雅,岡本健次,加藤克巳,早川直樹

    平成30年電気学会電力・エネルギー部門大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学 常三島キャンパス   Country:Japan  

  132. 直流ガス絶縁電力機器への傾斜機能材料の適用可能性

    伊豆淳宏,大石涼太,小島寛樹,加藤克巳,早川直樹

    平成30年電気学会電力・エネルギー部門大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学 常三島キャンパス   Country:Japan  

  133. 誘電率傾斜絶縁スペーサ作製における樹脂充填挙動の流動解析を用いた可視化

    今井隆浩,岡本徹志,保科好一,落合健太,小島寛樹,早川直樹

    第49回電気電子絶縁材料システムシンポジウム 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:愛媛大学 メディアセンター   Country:Japan  

  134. 加圧空気中の絶縁破壊経路に及ぼす1次ストリーマチャネルの影響

    浅野竜大,杉野一樹,小島寛樹,米須大吾,小林金也,六戸敏昭,早川直樹

    平成30年電気学会基礎・材料・共通部門大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:イーグレひめじ   Country:Japan  

  135. Volume-Time理論による繰り返しサージ電圧下の部分放電開始電圧の推定

    大長勇輝,梶武文,小島寛樹,早川直樹

    平成30年電気学会基礎・材料・共通部門大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:イーグレひめじ   Country:Japan  

  136. 空気中チャネル加熱絶縁破壊発生電圧の閾値の推定

    浅野竜大,小島寛樹,米須大吾,小林金也,六戸敏昭,早川直樹

    平成30年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名城大学   Country:Japan  

  137. 真空中スパークコンディショニング過程における溶融可能な微小突起の大きさの推定

    近藤史規,野田昌嗣,小島寛樹,福田英昭,榊正幸,早川直樹

    平成30年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2018.9

    Language:Japanese  

    Venue:名城大学   Country:Japan  

  138. 高電圧超電導ケーブルにおける低誘電損失合成紙Tyvek®の電気絶縁特性

    山上浩輝,民部昌孝,小島寛樹,早川直樹

    平成30年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2018.9

    Language:Japanese  

    Venue:名城大学   Country:Japan  

  139. 可変配合注型法による誘電率傾斜機能材料(ε-FGM)の作製における誘電率分布の制御性向上

    落合健太,小島寛樹,保科好一,今井隆浩,岡本徹志,早川直樹

    平成30年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名城大学   Country:Japan  

  140. 誘電率傾斜機能材料(ε-FGM)の電界緩和効果の絶縁スペーサ形状依存性

    伊豆淳宏,小島寛樹,満留博,柳瀬博雅,岡本健次,加藤克巳,早川直樹

    平成30年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名城大学   Country:Japan  

  141. 液体窒素中におけるGFRPの沿面放電特性

    民部昌孝,山上浩輝,小島寛樹,早川直樹

    平成30年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名城大学   Country:Japan  

  142. 乾燥空気中における部分放電形態と放射電磁波強度との相関

    余増強,小島寛樹,早川直樹

    平成30年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名城大学   Country:Japan  

  143. 真空中交流沿面フラッシオーバ電圧に及ぼす沿面上電界分布の影響

    大木駿士朗,小島寛樹,浅利直紀,塩入哲,佐々木良輔,早川直樹

    平成30年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名城大学   Country:Japan  

  144. 真空中陽極加熱絶縁破壊領域におけるコンディショニングと電極初期表面状態の関係

    野田昌嗣,大木駿士朗,小島寛樹,福田英昭,榊正幸,早川直樹

    平成30年電気学会全国大会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  145. 真空中沿面放電進展過程に対する放電経路上の初期帯電分布の影響

    生田和也,小島寛樹,飯塚伸介,田中荘,早川直樹

    平成30年電気学会全国大会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  146. インバータサージ電圧下における巻線の部分放電開始電圧に及ぼす気圧および湿度の複合的影響

    梶武文,浅井洋光,小島寛樹,早川直樹

    平成30年電気学会全国大会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  147. 空気中チャネル加熱絶縁破壊における高導電率チャネルの軸方向進展

    杉野一樹,浅野竜大,小島寛樹,米須大吾,小林金也,六戸敏昭,早川直樹

    平成30年電気学会全国大会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  148. 抵抗型超電導限流器を模擬したパンケーキコイルモデルの動的絶縁破壊特性

    民部昌孝,山上浩輝,小島寛樹,磯嶋茂樹,桑田稔,早川直樹

    平成30年電気学会全国大会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  149. 電界特異性を回避した絶縁スペーサにおける誘電率傾斜機能材料の電界緩和効果

    加藤克巳,満留博,柳瀬博雅,岡本健次,小島寛樹,早川直樹

    平成30年電気学会全国大会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  150. 導電率傾斜機能材料(σ-FGM)による沿面放電電圧向上効果

    大石涼太,伊豆淳宏,小島寛樹,加藤克巳,早川直樹

    平成30年電気学会全国大会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  151. 可変配合注型法によるポスト型誘電率傾斜機能材料の作製

    落合健太,大石涼太,小島寛樹,満留博,柳瀬博雅,岡本健次,加藤克巳,早川直樹

    平成30年電気学会全国大会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  152. インバータサージ電圧下における巻線の部分放電開始電圧に及ぼす温度および湿度の複合的影響

    梶武文,浅井洋光,小島寛樹,早川直樹

    電気学会放電/誘電・絶縁材料/高電圧合同研究会 

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    Event date: 2018.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:屋久島環境文化研修センター   Country:Japan  

  153. Electric Field Relaxation Effect of Functionally Graded Materials (FGM) with Conductive Multilayer Coating International conference

    R. Oishi, H. Kojima, N. Hayakawa, K. Kato

    2017 IEEE Conference on Electrical Insulation and Dielectric Phenomena  2017.10.23  IEEE DEIS

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Fort Worth   Country:United States  

    For the insulation design of gas insulated power apparatus, the electric field grading and control are indispensable. We have proposed the application of σ-FGM (Functionally Graded Materials with spatial distribution of conductivity σ) to solid insulators as a novel technique of the electric field grading and control. In this paper, we fabricated the conductive multilayer coating for σ-FGM and investigated the electric field relaxation effect of σ-FGM on a GIS spacer surface. The fabrication results revealed that we could obtain the conductive 3-layer coating by using the dip coating method. The calculation results revealed the technical feasibility of electric field relaxation by σ-FGM with the conductive multilayer coating.

    DOI: 10.1109/CEIDP.2017.8257494

    Scopus

  154. Surface Flashover Mechanism and Its Application to Diagnosis in Vacuum Interrupter Invited International conference

    H. Kojima

    4th International Conference on Electric Power Equipment - Switching Technology  2017.10.24  State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Xi'an   Country:China  

    The application of vacuum interrupters and vacuum circuit breakers for higher voltage level is strongly expected. In electrical insulation in vacuum, surface flashover on solid insulator is one of the main problems for the higher voltage vacuum interrupters. In this paper, through the review of our recent researches, we discuss on the initiation and development mechanisms of flashover in the configuration with electric field distribution almost perpendicular to the dielectrics surface. Usually, the flashover was begun by exclusive electron emission at the cathode; however, the large charging on the dielectric surface before the flashover allowed the flashover initiated by secondary electron emission avalanche to occur. The development characteristics of surface flashover agreed with the electron-stimulated outgassing mechanism. The flashover development characteristics were applied to the discharge diagnosis in vacuum, and the effectiveness of our proposed discharge discrimination method was verified.

    DOI: 10.1109/ICEPE-ST.2017.8188902

    Scopus

  155. 空気中チャネル加熱絶縁破壊に至る投入エネルギー密度

    杉野一樹,小島寛樹,大嶽敦,小林金也,六戸敏明,早川直樹

    平成29年電気学会基礎・材料・共通部門大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:室蘭工業大学   Country:Japan  

  156. 真空中固体絶縁物上の帯電存在時における2次電子なだれ起点の沿面放電メカニズム

    生田和也,小島寛樹,飯塚伸介,土屋賢治,早川直樹

    平成29年電気学会基礎・材料・共通部門大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:室蘭工業大学   Country:Japan  

  157. 真空中インパルス絶縁破壊における陽極注入エネルギーの推定

    野田昌嗣,小島寛樹,長谷川光佑,榊正幸,早川直樹

    平成29年電気学会基礎・材料・共通部門大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:室蘭工業大学   Country:Japan  

  158. Volume Effect of Dynamic Breakdown Strength in LN2 for Insulation Design of Resistive Superconducting Fault Current Limiters International conference

    N. Hayakawa, K. Ishida, M. Mimbu, H. Kojima, S. Isojima, M. Kuwata

    13th European Conference on Applied Superconductivity 

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    Event date: 2017.9

    Language:English   Presentation type:Poster presentation  

    Venue:Geneva   Country:Switzerland  

  159. Fault Current Limitation Coordination in Electric Power Grid with Superconducting Fault Current Limiters International conference

    N. Hayakawa, Y. Maeno, H. Kojima

    13th European Conference on Applied Superconductivity 

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    Event date: 2017.9

    Language:English   Presentation type:Poster presentation  

    Venue:Geneva   Country:Switzerland  

  160. 抵抗回路モデルによる空気中チャネル加熱絶縁破壊過程

    杉野一樹,小島寛樹,大嶽敦,小林金也,六戸敏昭,早川直樹

    平成29年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  161. 真空中のコンディショニングにおける電極初期表面状態と放電電荷量の相関

    野田昌嗣,小島寛樹,福田英昭,榊正幸,早川直樹

    平成29年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  162. 誘電率/導電率傾斜機能材料(ε/σ-FGM)による放電開始電圧向上の複合効果

    大石涼太,小島寛樹,加藤克巳,早川直樹

    平成29年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  163. 可変配合注型法による誘電率傾斜機能材料(ε-FGM)の作製に向けたコンポジットの選定および混合評価

    落合健太,大石涼太,小島寛樹,加藤克巳,早川直樹

    平成29年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  164. 高電圧超電導ケーブルに向けた低誘電損失材料における部分放電開始電界の圧力依存性

    民部昌孝,小島寛樹,早川直樹

    平成29年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  165. 真空中固体絶縁物上の帯電分布による沿面放電開始メカニズムへの影響

    生田和也,小島寛樹,飯塚伸介,田中荘,早川直樹

    平成29年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  166. 真空中交流部分放電における固体絶縁物上の2次電子放出係数と電荷挙動

    加藤丞,小島寛樹,早川直樹

    平成29年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  167. 電力系統の過渡安定度を考慮した超電導限流器の限流協調

    早川直樹,前野有哉,小島寛樹

    平成29年電気学会電力・エネルギー部門大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:明治大学 中野キャンパス   Country:Japan  

  168. 変圧器向け油含浸プレスボードの熱劣化後の圧縮特性評価

    師岡寿至,宮原秀幸,山岸明,三瓶宏幸,早川直樹,小島寛樹

    平成29年電気学会電力・エネルギー部門大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:明治大学 中野キャンパス   Country:Japan  

  169. 真空インタラプタ内放電パターン診断における放電前シールド電位の影響

    小島寛樹,道念大樹,木村俊則,小倉健太郎,早川直樹

    平成29年電気学会電力・エネルギー部門大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:明治大学 中野キャンパス   Country:Japan  

  170. 真空中放電電荷量を制御したコンディショニング過程における電極表面損傷の修復可能性

    野田昌嗣,小島寛樹,長谷川光佑,榊正幸,早川直樹

    平成29年電気学会電力・エネルギー部門大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:明治大学 中野キャンパス   Country:Japan  

  171. 導電率傾斜機能材料(σ-FGM)を適用したGISスペーサの放電開始電圧の理論的推定

    大石涼太,小島寛樹,加藤克巳,早川直樹

    平成29年電気学会電力・エネルギー部門大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:明治大学 中野キャンパス   Country:Japan  

  172. A Novel Fabrication Technique of Permittivity Graded Materials by Flexible Mixture Casting Method for GIS Spacers International conference

    N. Hayakawa, Y. Miyaji, K. Ochiai, H. Kojima, K. Kato

    20th International Symposium on High Voltage Engineering 

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    Event date: 2017.8 - 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Buenos Aires   Country:Argentina  

  173. Criteria for Channel Heating Breakdown under Non-Uniform Electric Field in Air International conference

    H. Kojima, K. Sugino, A. Ohtake, K. Kobayashi, T. Kato, T. Rokunohe

    20th International Symposium on High Voltage Engineering 

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    Event date: 2017.8 - 2017.9

    Language:English   Presentation type:Poster presentation  

    Venue:Buenos Aires   Country:Argentina  

  174. Controlling Breakdown Charge for Conditioning Procedure in Vacuum under Non-uniform Electric Field International conference

    H. Kojima, M. Noda, K. Hasegawa, M. Sakaki, N. Hayakawa

    20th International Symposium on High Voltage Engineering 

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    Event date: 2017.8 - 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Buenos Aires   Country:Argentina  

  175. 超電導限流器の開発動向と技術課題

    早川直樹,小島寛樹

    電気学会金属・セラミックス/超電導機器合同研究会 

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    Event date: 2017.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福島工業高等専門学校   Country:Japan  

  176. 放電チャネル進展時の電流-電磁波相関に基づく電磁波放射源に関する検討

    加藤拓,杉野一樹,小島寛樹,早川直樹

    平成29年電気学会全国大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  177. 真空中交流沿面フラッシオーバに及ぼす帯電極性・分布の影響

    川口王嗣,加藤丞,小島寛樹,浅利直紀,塩入哲,早川直樹

    平成29年電気学会全国大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  178. 真空中固体絶縁物上の初期帯電電位分布が沿面放電メカニズムに及ぼす影響

    生田和也,小島寛樹,飯塚伸介,土屋賢治,早川直樹

    平成29年電気学会全国大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  179. 空気中チャネル加熱絶縁破壊に至るエネルギーに関する考察

    杉野一樹,小島寛樹,大嶽敦,小林金也,加藤達朗,六戸敏昭,早川直樹

    平成29年電気学会全国大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  180. 超電導限流器を含む電力システムの限流協調

    前野有哉,小島寛樹,早川直樹

    平成29年電気学会全国大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  181. 超電導限流器の絶縁設計における液体窒素の動的絶縁破壊電界の体積効果

    石田一樹,民部昌孝,小島寛樹,礒嶋茂樹,桑田稔,早川直樹

    平成29年電気学会全国大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  182. 可変配合注型法による誘電率傾斜機能材料を適用したGISスペーサの絶縁破壊電圧の推定

    宮路仁崇,大石涼太,落合健太,小島寛樹,加藤克巳,早川直樹

    平成29年電気学会全国大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  183. 導電性多層コーティングによる導電率傾斜機能材料(σ-FGM)の作製・評価

    大石涼太,宮路仁崇,小島寛樹,加藤克巳,早川直樹

    平成29年電気学会全国大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  184. 真空中コンディショニング過程における放電電荷量制御の効果

    野田昌嗣,小島寛樹,長谷川光佑,榊正幸,早川直樹

    平成29年電気学会全国大会 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  185. 誘電率傾斜機能材料(ε-FGM)を用いたGISスペーサモデルの作製とSF6ガス中絶縁破壊電圧の理論的推定

    宮路仁崇,小島寛樹,加藤克巳,早川直樹

    電気学会放電/誘電・絶縁材料/高電圧合同研究会 

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    Event date: 2017.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長崎大学大学院工学研究科   Country:Japan  

  186. Fabrication and Evaluation of Permittivity Graded Materials with SrTiO3 Particles and Localized Conductive Layer International conference

    Y. Miyaji, H. Kojima, K. Kato, N. Hayakawa

    2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2016.10

    Language:English   Presentation type:Poster presentation  

    Venue:Toronto   Country:Canada  

    DOI: 10.1109/CEIDP.2016.7785622

    Scopus

  187. Electric Field Reduction by Functionally Graded Materials (FGM) with Permittivity and Conductivity Distribution International conference

    Y. Miyaji, N. Hayakawa, H. Kojima, K. Kato

    2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2016.10

    Language:English   Presentation type:Poster presentation  

    Venue:Toronto   Country:Canada  

    DOI: 10.1109/CEIDP.2016.7785621

    Scopus

  188. Discharge Pattern Discrimination for Composite Insulation System in Vacuum Interrupter International conference

    F. Kong, H. Kojima, T. Kimura, M. Tsukima, N. Hayakawa

    27th International Symposium on Discharges and Electrical Insulation in Vacuum 

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    Event date: 2016.9

    Language:English  

    Venue:Suzhou   Country:China  

    DOI: 10.1109/DEIV.2016.7763963

  189. Optimum Breakdown Charge for Spark Conditioning in Vacuum under Non-uniform Electric Field International conference

    H. Kojima, T. Takahashi, M. Noda, K. Hasegawa, M. Sakaki, N. Hayakawa

    27th International Symposium on Discharges and Electrical Insulation in Vacuum 

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    Event date: 2016.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Suzhou   Country:China  

    DOI: 10.1109/DEIV.2016.7748662

    Scopus

  190. UHF法における部分放電電流波形と電磁波強度との相関

    加藤拓,小島寛樹,早川直樹

    平成28年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊田工業高等専門学校   Country:Japan  

  191. 雷インパルス印加時における導電率傾斜機能材料(σ-FGM)の電界緩和効果

    大石涼太,宮路仁崇,小島寛樹,加藤克巳,早川直樹

    平成28年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊田工業高等専門学校   Country:Japan  

  192. 超電導限流器が導入された電力システムにおける過渡安定度を考慮した限流協調

    前野有哉,小島寛樹,早川直樹

    平成28年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊田工業高等専門学校   Country:Japan  

  193. 真空中コンディショニングおける陽極損耗と放電電荷量の相関

    野田昌嗣,小島寛樹,長谷川光佑,榊正幸,早川直樹

    平成28年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊田工業高等専門学校   Country:Japan  

  194. 真空中交流電圧下の帯電形成による部分放電開始電圧とフラッシオーバ電圧の相関

    川口王嗣,小島寛樹,浅利直紀,塩入哲,早川直樹

    平成28年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊田工業高等専門学校   Country:Japan  

  195. 直流極性反転時における真空中固体絶縁物上の電荷挙動

    生田和也,小島寛樹,早川直樹

    平成28年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊田工業高等専門学校   Country:Japan  

  196. CO2ガス中におけるチャネル加熱絶縁破壊メカニズム

    杉野一樹,小島寛樹,早川直樹

    平成28年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊田工業高等専門学校   Country:Japan  

  197. 液体窒素の動的絶縁破壊特性におけるギャップ長依存性

    石田一樹,小島寛樹,礒嶋茂樹,桑田稔,早川直樹

    平成28年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊田工業高等専門学校   Country:Japan  

  198. 可変配合注型法による傾斜機能材料(FGM)の誘電率分布と電界緩和効果

    宮路仁崇,小島寛樹,加藤克巳,早川直樹

    平成28年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊田工業高等専門学校   Country:Japan  

  199. 高電圧超電導ケーブルの低誘電損失化に向けたポーラス紙の電気絶縁特性

    石田一樹,小島寛樹,早川直樹

    平成28年電気学会電力・エネルギー部門大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州工業大学 戸畑キャンパス   Country:Japan  

  200. 真空インタラプタにおけるシールド電位の非接触測定を用いた放電パターン推定

    小島寛樹,孔飛,木村俊則,月間満,早川直樹

    平成28年電気学会電力・エネルギー部門大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州工業大学 戸畑キャンパス   Country:Japan  

  201. SrTiO3/SiO2を用いた同軸ディスク型誘電率傾斜機能材料の作製およびGISスペーサの電界緩和効果

    宮路仁崇,大石涼太,小島寛樹,加藤克巳,早川直樹

    平成28年電気学会電力・エネルギー部門大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州工業大学 戸畑キャンパス   Country:Japan  

  202. 放射電磁波によるノイズ環境下のGIS内部部分放電識別

    早川直樹,汲田将之,小島寛樹,吉田昌展

    平成28年電気学会電力・エネルギー部門大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州工業大学 戸畑キャンパス   Country:Japan  

  203. 導電性多層コーティングによる導電率傾斜機能材料(σ-FGM)の電界緩和効果

    大石涼太,宮路仁崇,小島寛樹,加藤克巳,早川直樹

    平成28年電気学会基礎・材料・共通部門大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州工業大学 戸畑キャンパス   Country:Japan  

  204. 空気中1次ストリーマ残留空間の電界が2次ストリーマ進展に及ぼす影響

    杉野一樹,小島寛樹,大嶽敦,小林金也,加藤達朗,六戸敏昭,早川直樹

    平成28年電気学会基礎・材料・共通部門大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州工業大学 戸畑キャンパス   Country:Japan  

  205. SrTiO3を用いた可変配合注型法による誘電率傾斜機能材料(ε-FGM)の電界緩和効果

    宮路仁崇,大石涼太,小島寛樹,加藤克巳,早川直樹

    平成28年電気学会基礎・材料・共通部門大会 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州工業大学 戸畑キャンパス   Country:Japan  

  206. Breakdown Characteristics and Mechanisms of Liquid Nitrogen under Transient Thermal Stress for Superconducting Fault Current Limiters International conference

    N. Hayakawa, T. Matsuoka, H. Kojima, S. Isojima, M. Kuwata

    2016 Applied Superconductivity Conference 

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    Event date: 2016.9

    Language:English   Presentation type:Poster presentation  

    Country:United States  

  207. Electrical Insulation Characteristics and Mechanisms of Low Dielectric Loss Materials for High-Voltage HTS Cables International conference

    N. Hayakawa, K. Ishida, T. Matsuoka, H. Kojima

    2016 Applied Superconductivity Conference 

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    Event date: 2016.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  208. 絶縁性液体適用機器の放電現象、劣化現象、診断技術

    森繁和,小迫雅裕,小島寛樹,福地哲生,栗原二三夫,小林広和,宮島極

    平成28年電気学会全国大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:東北大学 川内北キャンパス   Country:Japan  

  209. 真空中における陰極めっきによる絶縁性能向上

    高橋達也,小島寛樹,長谷川光佑,榊正幸,早川直樹

    平成28年電気学会全国大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学 川内北キャンパス   Country:Japan  

  210. 真空中スパークコンディショニングにおける最低破壊電圧の向上手法

    高橋達也,野田正嗣,小島寛樹,長谷川光佑,榊正幸,早川直樹

    平成28年電気学会全国大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学 川内北キャンパス   Country:Japan  

  211. 真空インタラプタ内の放電パターンの識別手法に関する考察

    孔飛,小島寛樹,木村俊則,月間満,早川直樹

    平成28年電気学会全国大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学 川内北キャンパス   Country:Japan  

  212. TiO2/PTFEを用いた誘電率傾斜機能材料(FGM)による電力機器の電界緩和効果

    張逸凡,宮路仁崇,栗本宗明,小島寛樹,加藤克巳,早川直樹

    平成28年電気学会全国大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学 川内北キャンパス   Country:Japan  

  213. 液体窒素の動的絶縁破壊特性を考慮した超電導限流器の絶縁設計に関する考察

    松岡達矢,石田一樹,小島寛樹,礒嶋茂樹,桑田稔,早川直樹

    平成28年電気学会全国大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学 川内北キャンパス   Country:Japan  

  214. 高電圧超電導ケーブルに向けた低誘電損失材料の部分放電開始特性

    石田一樹,松岡達矢,小島寛樹,早川直樹

    平成28年電気学会全国大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学 川内北キャンパス   Country:Japan  

  215. 可変配合注型法を用いた誘電率傾斜機能材料(FGM)によるGISスペーサの電界緩和効果

    宮路仁崇,栗本宗明,小島寛樹,加藤克巳,早川直樹

    平成28年電気学会全国大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学 川内北キャンパス   Country:Japan  

  216. 初期帯電を考慮した真空中沿面放電開始メカニズム

    伊吹憲哉,生田和也,小島寛樹,飯塚伸介,土屋賢治,早川直樹

    平成28年電気学会全国大会 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学 川内北キャンパス   Country:Japan  

  217. SrTiO3を用いた誘電率傾斜機能材料および局部導電性コーティングの作製・評価

    宮路仁崇,栗本宗明,小島寛樹,加藤克巳,早川直樹

    電気学会放電/誘電・絶縁材料/高電圧合同研究会 

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    Event date: 2016.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:宮崎公立大学 交流センター内 多目的ホール   Country:Japan  

  218. ナノ粒子添加絶縁油の電気絶縁特性

    近藤貴文,小島寛樹,花井正広,早川直樹

    電気学会静止器研究会 

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    Event date: 2015.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:電気学会 会議室   Country:Japan  

  219. 真空中におけるスパークコンディショニングの最適放電電荷量

    高橋達也,小島寛樹,長谷川光佑,榊正幸,早川直樹

    電気学会放電/開閉保護/高電圧合同研究会 

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    Event date: 2015.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:姫路市商工会議所   Country:Japan  

  220. Fluctuation and Change of Partial Discharge Inception Voltage under High Humidity for Rectangular Wire Motors International conference

    T. Wakimoto, H. Kojima, N. Hayakawa

    2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2015.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

    DOI: 10.1109/CEIDP.2015.7351997

    Scopus

  221. 真空中の複合電極系における放電進展特性

    孔飛,中野裕介,小島寛樹,木村俊則,月間満,早川直樹

    平成27年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

  222. SiO2ナノ粒子添加アルキルベンゼンの交流絶縁破壊電圧におけるナノ粒子濃度依存性

    近藤貴文,小島寛樹,花井正広,早川直樹

    平成27年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

  223. 誘電率/導電率傾斜機能材料(ε/σ-FGM)による電界制御の複合効果

    宮路仁崇,栗本宗明,小島寛樹,加藤克巳,早川直樹

    平成27年度電気・電子・情報関係学会東海支部連合大会 

     More details

    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

  224. 真空中不平等電界下におけるコンディショニング飽和後の絶縁破壊機構のギャップ長依存性

    高橋達也,小島寛樹,長谷川光佑,榊正幸,早川直樹

    平成27年度電気・電子・情報関係学会東海支部連合大会 

     More details

    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

  225. 液体窒素の動的絶縁破壊特性における電極直径および圧力依存性

    松岡達矢,石田一樹,小島寛樹,礒嶋茂樹,桑田稔,早川直樹

    平成27年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

  226. 直流/インパルス重畳電圧下における真空中沿面放電特性

    伊吹憲哉,中野裕介,小島寛樹,飯塚伸介,土屋賢治,早川直樹

    平成27年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

  227. 局部導電性コーティングによるGISスペーサの電界緩和効果

    宮路仁崇,小島寛樹,加藤克巳,早川直樹

    平成27年電気学会基礎・材料・共通部門大会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学 角間キャンパス 自然科学本館   Country:Japan  

  228. ナノ粒子添加絶縁油の交流絶縁破壊電圧の油中水分量依存性

    近藤貴文,小島寛樹,花井正広,早川直樹

    平成27年電気学会基礎・材料・共通部門大会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学 角間キャンパス 自然科学本館   Country:Japan  

  229. 真空中不平等電界下におけるスパークコンディショニング特性の陽極材料およびギャップ長依存性

    高橋達也,小島寛樹,長谷川光佑,斉藤仁,榊正幸,早川直樹

    平成27年電気学会基礎・材料・共通部門大会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学 角間キャンパス 自然科学本館   Country:Japan  

  230. 真空中の浮遊電極を介する沿面放電特性

    孔飛,中野裕介,小島寛樹,木村俊則,月間満,早川直樹

    平成27年電気学会基礎・材料・共通部門大会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢大学 角間キャンパス 自然科学本館   Country:Japan  

  231. Pressure Dependence and Size Effect of Dynamic Breakdown Characteristics of LN2 under Transient Electrical/Thermal Combined Stress International conference

    N. Hayakawa, T. Matsuoka, K. Ishida, H. Kojima, S. Isojima, M. Kuwata

    12th European Conference on Applied Superconductivity 

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    Event date: 2015.9

    Language:English   Presentation type:Poster presentation  

    Country:France  

  232. 誘電率/導電率複合傾斜機能材料(ε/σ-FGM)によるGISスペーサの電界緩和効果

    宮路仁崇,石黒純也,栗本宗明,小島寛樹,加藤克巳,早川直樹

    平成27年電気学会電力・エネルギー部門大会 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名城大学 天白キャンパス   Country:Japan  

  233. 高電圧超電導ケーブルに向けた低誘電損失材料の電気絶縁特性

    石田一樹,松岡達矢,小島寛樹,早川直樹

    平成27年電気学会電力・エネルギー部門大会 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名城大学 天白キャンパス   Country:Japan  

  234. Kerr Electro-optic Field Measurement and Electrical Insulation Techniques in HVDC Oil-Pressboard Composite Insulation Systems International conference

    H. Okubo, H. Kojima, N. Hayakawa, S. Jaufer, C. Krause

    19th International Symposium on High Voltage Engineering 

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    Event date: 2015.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Czech Republic  

  235. Impulse Surface Flashover Development with Transient Charging on Solid Insulators in Vacuum through Streak Image Observation International conference

    Y. Nakano, H. Kojima, K. Tsuchiya, N. Hayakawa

    19th International Symposium on High Voltage Engineering 

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    Event date: 2015.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Czech Republic  

  236. Breakdown Charge Dependence for Saturation of Spark Conditioning under Non-uniform Electric Field in Vacuum International conference

    T. Takahashi, H. Kojima, K. Hasegawa, H. Saito, M. Sakaki, N. Hayakawa

    19th International Symposium on High Voltage Engineering 

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    Event date: 2015.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Czech Republic  

  237. Breakdown and Flashover Characteristics for Discharge via Floating Electrode and Solid Insulator in Vacuum International conference

    F. Kong, Y. Nakano, H. Kojima, T. Kimura, M. Tsukima, N. Hayakawa

    19th International Symposium on High Voltage Engineering 

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    Event date: 2015.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Czech Republic  

  238. Breakdown Mechanism Based on Secondary Streamer Propagation and Channel Heating under Non-uniform Electric Field in Air International conference

    H. Kojima, T. Kitamura, S. Goto, K. Kobayashi, T. Kato, T. Rokunohe, N. Hayakawa

    19th International Symposium on High Voltage Engineering 

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    Event date: 2015.8

    Language:English   Presentation type:Poster presentation  

    Country:Czech Republic  

  239. Reduction of Measurement Fluctuation of Partial Discharge Inception Voltage for Inverter-fed Rectangular Wire Motors International conference

    T. Wakimoto, H. Kojima, N. Hayakawa

    19th International Symposium on High Voltage Engineering 

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    Event date: 2015.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Czech Republic  

  240. Asset Management for Power Apparatus with Intelligent Grid Management System (IGMS) International conference

    H. Kojima, K. Fukaya, N. Hayakawa, M. Hanai, H. Okubo

    19th International Symposium on High Voltage Engineering 

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    Event date: 2015.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Czech Republic  

  241. 真空中沿面フラッシオーバ進展過程における導電チャネル形成時間

    孔飛,中野裕介,小島寛樹,木村俊則,月間満,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  242. 電力系統最適運用システム(IGMS)を用いた電力機器のアセットマネジメント

    深谷皇紀,小島寛樹,花井正広,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  243. スパイラルアンテナによるGIS外部漏出電磁波測定

    汲田将之,小島寛樹,吉田昌展,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  244. 真空中不平等電界下におけるスパークコンディショニング効果の陽極材料依存性

    高橋達也,小島寛樹,長谷川光佑,斉藤仁,榊正幸,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  245. SrTiO3/BNを用いた誘電率傾斜機能材料によるGISスペーサの電界緩和効果

    張逸凡,石黒純也,栗本宗明,小島寛樹,加藤克巳,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  246. 液体窒素の動的絶縁破壊特性における圧力依存性

    松岡達矢,石田一樹,小島寛樹,礒嶋茂樹,桑田稔,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  247. 超純水における絶縁破壊電界の温度・流量および圧力依存性

    佐藤広治,近藤貴文,小島寛樹,花井正広,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  248. ナノ粒子添加絶縁油の交流絶縁破壊特性におけるギャップ長依存性

    近藤貴文,佐藤広治,小島寛樹,花井正広,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  249. N2/O2混合ガス中における1次ストリーマ進展特性

    北村卓也,後藤成彦,小島寛樹,小林金也,加藤達朗,六戸敏昭,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  250. CO2/N2混合ガス中1次ストリーマ進展過程

    後藤成彦,北村卓也,小島寛樹,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  251. 真空中交流部分放電における帯電形成へのアルミナ絶縁物欠陥の影響

    仲田祐希,小島寛樹,早川直樹,浅利直紀,塩入哲,松尾和宏

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  252. 真空中沿面フラッシオーバ進展過程における過渡帯電分布と2次電子なだれの時間推移

    中野裕介,小島寛樹,土屋賢治,早川直樹

    平成27年電気学会全国大会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学 世田谷キャンパス   Country:Japan  

  253. 平角線モータにおける部分放電開始電圧のばらつき低減方法

    脇本亨,小島寛樹,早川直樹

    電気学会誘電・絶縁材料/電線・ケ-ブル合同研究会 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中央電気倶楽部   Country:Japan  

  254. 真空中沿面フラッシオーバ進展過程における実効的2次電子放出係数

    中野裕介,小島寛樹,土屋賢治,早川直樹

    電気学会放電/誘電・絶縁材料/高電圧合同研究会 

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    Event date: 2015.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  255. 真空中不平等電界下におけるスパークコンディショニングの放電電荷量依存性

    高橋達也,小島寛樹,長谷川光佑,斉藤仁,榊正幸,早川直樹

    電気学会放電/誘電・絶縁材料/高電圧合同研究会 

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    Event date: 2015.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 伊都キャンパス   Country:Japan  

  256. Influence of Space Charge by Primary and Secondary Streamers on Breakdown Mechanism under Non-uniform Electric Field in Air International conference

    T. Kitamura, H. Kojima, K. Kobayashi, T. Kato, T. Rokunohe, N. Hayakawa

    2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2014.10

    Language:English   Presentation type:Poster presentation  

    Country:United States  

    DOI: 10.1109/CEIDP.2014.6995797

    Scopus

  257. Electric Field Control in Coaxial Disk-Type Solid Insulator by Functionally Graded Materials (FGM) International conference

    J. Ishiguro, M. Kurimoto, H. Kojima, K. Kato, H. Okubo, N. Hayakawa

    2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2014.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

    DOI: 10.1109/CEIDP.2014.6995799

    Scopus

  258. Conditioning Development in Vacuum Based on Breakdown Probability Distribution International conference

    H. Kojima, Y. Otake, M. Sakaki, H. Saito, K. Hasegawa, N. Hayakawa

    International Symposia on Discharge and Electrical Insulation in Vacuum 2014 

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    Event date: 2014.9 - 2014.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:India  

    DOI: 10.1109/DEIV.2014.6961607

    Scopus

  259. Influence of Heat Treatment in Atmosphere for Surface Flashover Characteristics on Alumina in Vacuum International conference

    N. Asari, T. Shioiri, J. Sato, K. Matsuo, H. Kojima, M. Hanai, N. Hayakawa

    International Symposia on Discharge and Electrical Insulation in Vacuum 2014 

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    Event date: 2014.9 - 2014.10

    Language:English   Presentation type:Poster presentation  

    Country:India  

    DOI: 10.1109/DEIV.2014.6961626

    Scopus

  260. Transient Charging for Impulse Surface Flashover Development in Vacuum International conference

    Y. Nakano, H. Kojima, K. Tsuchiya, N. Hayakawa

    International Symposia on Discharge and Electrical Insulation in Vacuum 2014 

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    Event date: 2014.9 - 2014.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:India  

    DOI: 10.1109/DEIV.2014.6961618

    Scopus

  261. Planning Maintenance Strategy for Power Apparatus and T&D System with Intelligent Grid Management System (IGMS) International conference

    H. Kojima, K. Fukaya, M. Hanai, N. Hayakawa, H. Okubo

    International Conference on Condition Monitoring and Diagnosis 2014 

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    Event date: 2014.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  262. 電力系統最適運用システム(IGMS)による電力機器の保守戦略とコスト削減効果

    深谷皇紀,小島寛樹,花井正広,大久保仁,早川直樹

    平成26年電気学会電力・エネルギー部門大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:同志社大学 京田辺キャンパス   Country:Japan  

  263. 誘電率傾斜機能材料(FGM)によるGISスペーサの電界制御・緩和効果

    石黒純也,栗本宗明,小島寛樹,加藤克巳,早川直樹

    平成26年電気学会電力・エネルギー部門大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:同志社大学 京田辺キャンパス   Country:Japan  

  264. スパイラルアンテナを用いたGIS内電磁波放射・伝搬特性の金属異物長依存性

    汲田将之,小島寛樹,吉田昌展,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  265. 真空中平等電界下におけるスパークコンディショニングの放電電荷量および電極材料依存性

    高橋達也,小島寛樹,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  266. 空気中1次ストリーマ進展と放電電流の相関

    北村卓也,後藤成彦,小島寛樹,小林金也,加藤達朗,六戸敏昭,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  267. 真空中の絶縁破壊時における浮遊電極電位の過渡的推移

    孔飛,中野裕介,小島寛樹,木村俊則,月間満,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  268. 油浸複合短ギャップ絶縁構成の直流電界下における電荷欠乏現象

    吉川太郎,小島寛樹,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  269. IGMS(Intelligent Grid Management System)による変圧器の劣化制御を考慮した保守戦略

    深谷皇紀,小島寛樹,花井正広,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  270. 超電導電力機器のクエンチ環境下における液体窒素中の気泡挙動と動的絶縁破壊電界

    松岡達矢,小島寛樹,礒嶋茂樹,野口浩二,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  271. 傾斜機能材料(FGM)のフィラー粒径分布による誘電率分布制御

    石黒純也,栗本宗明,小島寛樹,加藤克巳,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  272. 真空中沿面フラッシオーバ進展の制御および抑制

    中野裕介,小島寛樹,土屋賢治,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  273. 真空中交流部分放電による帯電が沿面フラッシオーバ特性に及ぼす影響

    仲田祐希,小島寛樹,浅利直紀,塩入哲,松尾和宏,早川直樹

    平成26年度電気・電子・情報関係学会東海支部連合大会 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:中京大学 名古屋キャンパス1号館   Country:Japan  

  274. 空気中における2次ストリーマ進展およびチャネル加熱による絶縁破壊機構

    北村卓也,後藤成彦,小島寛樹,小林金也,六戸敏昭,早川直樹

    平成26年電気学会基礎・材料・共通部門大会 

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    Event date: 2014.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:信州大学 長野(工学)キャンパス   Country:Japan  

  275. 真空中不平等電界下におけるCu-Cr電極のインパルスコンディショニングの飽和条件

    高橋達也,大竹泰智,小島寛樹,長谷川光佑,斉藤仁,榊正幸,早川直樹

    平成26年電気学会基礎・材料・共通部門大会 

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    Event date: 2014.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:信州大学 長野(工学)キャンパス   Country:Japan  

  276. 真空中沿面フラッシオーバ進展時の過渡帯電による放出電子電流抑制効果

    中野裕介,小島寛樹,土屋賢治,早川直樹

    平成26年電気学会基礎・材料・共通部門大会 

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    Event date: 2014.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:信州大学 長野(工学)キャンパス   Country:Japan  

  277. スパイラルアンテナによるSF6ガス中部分放電放射電磁波測定

    汲田将之,小島寛樹,吉田昌展,早川直樹

    平成26年電気学会基礎・材料・共通部門大会 

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    Event date: 2014.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:信州大学 長野(工学)キャンパス   Country:Japan  

  278. Quench-induced Dynamic Breakdown Characteristics of LN2 and LN2/PPLP Composite Electrical Insulation System for Superconducting Power Apparatus International conference

    N. Hayakawa, T. Matsuoka, S. Nishimachi, H. Kojima, M. Hanai

    Applied Superconductivity Conference 

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    Event date: 2014.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  279. Fault Current Limiting Cooperation in Power Transmission System with Superconducting Fault Current Limiting Cables (SFCLC) International conference

    H. Kojima, T. Osawa, M. Hanai, N. Hayakawa

    Applied Superconductivity Conference 

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    Event date: 2014.8

    Language:English   Presentation type:Poster presentation  

    Country:United States  

  280. Breakdown Characteristics and Size Effect in Sub-Cooled Liquid Nitrogen International conference

    N. Hayakawa, S. Nishimachi, T. Matsuoka, H. Kojima, M. Hanai, H. Okubo

    18th International Conference on Dielectric Liquids 

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    Event date: 2014.6 - 2014.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Slovenia  

    DOI: 10.1109/ICDL.2014.6893087

    Scopus

  281. ガス中部分放電特性と放射電磁波特性との相関性

    汲田将之,水野龍之介,小島寛樹,花井正広,吉田昌展,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  282. 電力系統最適運用システム(IGMS)による系統全体の電力機器に対する最適保守戦略の立案

    深谷皇紀,小島寛樹,花井正広,大久保仁,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  283. 超電導限流ケーブル(SFCLC)が導入された電力システムにおける故障電流の限流協調

    大澤岳士,小島寛樹,花井正広,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  284. 超電導ケーブルにおける液体窒素/絶縁紙複合絶縁系の動的電気絶縁特性

    西町誠一郎,小島寛樹,花井正広,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  285. 超電導電力機器における液体窒素の動的絶縁破壊特性

    松岡達矢,西町誠一郎,小島寛樹,礒嶋茂樹,野口浩二,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  286. 傾斜機能材料(FGM)を適用したGISスペーサの電界緩和効果の検証

    石黒純也,栗本宗明,小島寛樹,花井正広,加藤克巳,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  287. エナメル平角電線の部分放電開始電圧および表面電位分布推移に与えるプレ放電の影響

    脇本亨,小島寛樹,花井正広,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  288. 超純水の短ギャップ交流絶縁破壊特性

    佐藤広治,小島寛樹,花井正広,加藤克巳,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  289. 液体窒素/ポーラス絶縁紙複合絶縁系の電気絶縁特性

    西町誠一郎,松岡達矢,栗本宗明,小島寛樹,花井正広,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  290. 真空中不平等電界下におけるコンディショニング進展の昇圧方法依存性

    大竹泰智,高橋達也,小島寛樹,長谷川光佑,斉藤仁,榊正幸,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  291. 真空中交流部分放電における熱処理アルミナ上の帯電形成・進展特性

    仲田祐希,小島寛樹,花井正広,浅利直紀,塩入哲,松尾和宏,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  292. 真空中の浮遊電極を介する絶縁破壊過程に関する実験的考察

    孔飛,中野裕介,小島寛樹,木村俊則,月間満,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  293. セラミックスの大気中熱処理が真空中のセラミックス表面の発光開始電圧に与える影響

    浅利直紀,塩入哲,佐藤純一,松尾和宏,小島寛樹,花井正広,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Chinese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  294. 真空中沿面フラッシオーバ進展過程における過渡帯電電荷量と放電進展条件

    中野裕介,小島寛樹,土屋賢治,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  295. 空気中の絶縁破壊チャネル発生に及ぼす部分放電残留電荷の影響

    北村卓也,小島寛樹,小林金也,加藤達朗,六戸敏昭,早川直樹

    平成26年電気学会全国大会 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

  296. 液体窒素の絶縁破壊電界におけるサイズ効果の圧力・温度依存性

    西町誠一郎,小島寛樹,花井正広,早川直樹

    電気学会放電/誘電・絶縁材料/高電圧合同研究会 

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    Event date: 2014.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州工業大学戸畑キャンパス   Country:Japan  

  297. Inception Mechanism of Surface Flashover on Solid Insulator in Vacuum International conference

    Y .Nakano, H. Kojima, N. Hayakawa, K. Tsuchiya, H. Okubo

    International Symposium on EcoTopia Science 2013 

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    Event date: 2013.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  298. Intelligent Grid Management System (IGMS) with Optimum Power Flow and Degradation Control of Power Apparatus International conference

    K. Fukaya, K. Shinoda, H. Kojima, M. Hanai, H. Okubo, N. Hayakawa

    International Symposium on EcoTopia Science 2013 

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    Event date: 2013.12

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  299. Electrical Insulation Characteristics of Insulating Oil with Dispersed TiO2 and ZnO Nanoparticles International conference

    K. Sato, S. Hosomi, M. Hanai, H. Kojima, N. Hayakawa, H. Okubo

    International Symposium on EcoTopia Science 2013 

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    Event date: 2013.12

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  300. Spark Conditioning Effect on Multi-gap Electrode System in Vacuum International conference

    Y. Otake, H. Kojima, N. Hayakawa, K. Hasegawa, H. Saito, M. Sakaki, H. Okubo

    International Symposium on EcoTopia Science 2013 

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    Event date: 2013.12

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  301. Initiation and Propagation Mechanism of Leader-type Breakdown in Air International conference

    T. Kitamura, K. Hotta, H. Kojima, N. Hayakawa, K. Kobayashi, T. Kato, T. Rokunohe, H. Okubo

    International Symposium on EcoTopia Science 2013 

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    Event date: 2013.12

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  302. Electric Field Control for Gas Insulated Switchgear with Functionally Graded Materials (FGM) on Surface Conductivity International conference

    J. Ishiguro, H. Kojima, M. Hanai, K. Kato, H. Okubo, N. Hayakawa

    International Symposium on EcoTopia Science 2013 

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    Event date: 2013.12

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  303. Influence of Needle Electrode Material and Shape on Electromagnetic Wave Radiation Characteristics of Partial Discharge in SF6 Gas International conference

    R. Mizuno, M. Hanai, H. Kojima, N. Hayakawa, M. Yoshida, H. Okubo

    International Symposium on EcoTopia Science 2013 

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    Event date: 2013.12

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  304. Current Limiting Characteristics of Superconducting Fault Current Limiting Cable (SFCLC) with Longitudinal Temperature Distribution International conference

    T. Osawa, H. Kojima, M. Hanai, N. Hayakawa, H. Okubo

    International Symposium on EcoTopia Science 2013 

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    Event date: 2013.12

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  305. Partial Discharge Inception Characteristics of Rectangular Wires for Inverter-fed Motors International conference

    T. Wakimoto, H. Kojima, M. Hanai, N. Hayakawa

    International Symposium on EcoTopia Science 2013 

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    Event date: 2013.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  306. 真空中における突発的電子放出に起因する沿面フラッシオーバメカニズム

    中野裕介,小島寛樹,土屋賢治,早川直樹

    電気学会放電/開閉保護/高電圧合同研究会 

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    Event date: 2013.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:かごしま県民交流センター   Country:Japan  

  307. Conditioning Process of Multi-gap Electrode System with Cu-Cr Rod Electrode in Vacuum International conference

    Y. Otake, H. Kojima, N. Hayakawa, K. Hasegawa, H. Saito, M. Sakaki, H. Okubo

    2nd International Conference on Electric Power Equipment - Switching Technology 

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    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    DOI: 10.1109/ICEPE-ST.2013.6804375

    Scopus

  308. Dependence of TiO2 and ZnO Nanoparticle Concentration on Electrical Insulation Characteristics of Insulating Oil International conference

    M. Hanai, S. Hosomi, H. Kojima, N. Hayakawa, H. Okubo

    2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2013.10

    Language:English   Presentation type:Poster presentation  

    Country:China  

    DOI: 10.1109/CEIDP.2013.6748164

    Scopus

  309. Transition of Partial Discharge Inception Voltage under High Humidity for Enameled Rectangular Wires International conference

    T. Wakimoto, H. Kojima, M. Hanai, N. Hayakawa

    2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2013.10

    Language:English   Presentation type:Poster presentation  

    Country:China  

    DOI: 10.1109/CEIDP.2013.6748317

    Scopus

  310. Development of Discharge Inception Simulator Considering Environmental Factors Using Advection-Diffusion Model International conference

    A. Ohtake, K. Kobayashi, T. Kato, N. Yanagita, T. Rokunohe, H. Kojima, N. Hayakawa, H. Okubo

    2nd International Conference on Electric Power Equipment - Switching Technology 

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    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    DOI: 10.1109/ICEPE-ST.2013.6804308

    Scopus

  311. Inception and Expansion Process of Surface Flashover on Solid Dielectrics in Vacuum International conference

    Y. Nakano, H. Kojima, N. Hayakawa, K. Tsuchiya, H. Okubo

    2nd International Conference on Electric Power Equipment - Switching Technology 

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    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    DOI: 10.1109/ICEPE-ST.2013.6804361

    Scopus

  312. Partial Discharge Characteristics and Mechanisms in Consideration of Charge Behavior on Alumina Dielectrics under AC Voltage in Vacuum International conference

    H. Kojima, M. Ishida, N. Hayakawa, M. Hanai, J. Ikeda, T. Shioiri, H. Okubo

    2nd International Conference on Electric Power Equipment - Switching Technology 

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    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    DOI: 10.1109/ICEPE-ST.2013.6804363

    Scopus

  313. 無鉄心超電導変圧器を用いた超電導限流/潮流制御装置(SPFCL)の限流特性

    Cheng Wai Tatt,西町誠一郎,小島寛樹,花井正広,鹿島直二,長屋重夫,杉本重行,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  314. 高湿度下のプレ放電がエナメル平角電線の部分放電開始電圧特性に与える影響

    脇本亨,小島寛樹,花井正広,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  315. 導電率傾斜機能材料(FGM)適用によるGISスペーサの電界制御

    石黒純也,小島寛樹,花井正広,加藤克巳,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  316. サブクール液体窒素の絶縁破壊メカニズムおよびサイズ効果

    西町誠一郎,小島寛樹,花井正広,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  317. TiO2およびZnOナノ粒子分散による鉱油の電気絶縁特性向上

    佐藤広治,小島寛樹,花井正広,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  318. 真空中棒-平板電極系におけるスパークコンディショニング特性の放電電荷量依存性

    大竹泰智,小島寛樹,長谷川光佑,斉藤仁,榊正幸,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  319. 空気中不平等電界下におけるリーダ型絶縁破壊特性

    北村卓也,小島寛樹,小林金也,加藤達朗,六戸敏昭,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  320. 真空中沿面フラッシオーバの過渡帯電量と進展特性

    中野裕介,小島寛樹,土屋賢治,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  321. IGMS(Intelligent Grid Management System)による電力機器の最適保守計画の導出精度

    深谷皇紀,小島寛樹,花井正広,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  322. 電磁波伝搬特性に基づくUHF法によるSF6ガス中/空気中部分放電の識別

    水野龍之介,小島寛樹,花井正広,吉田昌展,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  323. 超電導限流ケーブル(SFCLC)の限流特性におけるケーブル入口温度依存性

    大澤岳士,小島寛樹,花井正広,早川直樹

    平成25年度電気関係学会東海支部連合大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:静岡大学浜松キャンパス   Country:Japan  

  324. Influence of Longitudinal Temperature Distribution on Current Limiting Function of Superconducting Fault Current Limiting Cable (SFCLC) International conference

    H. Kojima, T. Osawa, N. Hayakawa, M. Hanai, H. Okubo

    11th European Conference on Applied Superconductivity 

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    Event date: 2013.9

    Language:English   Presentation type:Poster presentation  

    Country:Italy  

  325. エナメル平角電線における高湿度下の部分放電開始電圧推移

    脇本亨,花井正広,小島寛樹,早川直樹

    平成25年電気学会基礎・材料・共通部門大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜国立大学   Country:Japan  

  326. 真空中沿面フラッシオーバ開始時の放出電流特性

    中野裕介,小島寛樹,土屋賢治,大久保仁,早川直樹

    平成25年電気学会基礎・材料・共通部門大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜国立大学   Country:Japan  

  327. 誘電率傾斜機能材料(FGM)によるGISスペーサ電界制御のフィラー粒径分布依存性

    石黒純也,小島寛樹,花井正広,加藤克巳,大久保仁,早川直樹

    平成25年電気学会基礎・材料・共通部門大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜国立大学   Country:Japan  

  328. TiO2ナノ粒子分散による絶縁油の電気絶縁特性向上

    佐藤広治,細見聡彦,小島寛樹,早川直樹,大久保仁

    平成25年電気学会基礎・材料・共通部門大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜国立大学   Country:Japan  

  329. 空気中2次ストリーマ進展に及ぼす背後電界の影響

    北村卓也,小島寛樹,早川直樹,小林金也,加藤達朗,六戸敏昭,大久保仁

    平成25年電気学会基礎・材料・共通部門大会 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜国立大学   Country:Japan  

  330. Advanced Electrical Insulation Techniques for Higher Voltage Vacuum Interrupters International conference

    H. Okubo, H. Kojima, K. Kato, N. Hayakawa, M. Hanai

    Cigré Study Committees B3/D1 Colloquium 

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    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Australia  

  331. Intelligent Power Flow Control and Maintenance Technology by IGMS International conference

    M. Hanai, H. Kojima, N. Hayakawa, H. Okubo

    Cigré Study Committees B3/D1 Colloquium 

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    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Australia  

  332. 電力系統最適運用システム(IGMS)による機器状態と潮流との協調制御

    深谷皇紀,篠田康生,小島寛樹,花井正広,大久保仁,早川直樹

    平成25年電気学会電力・エネルギー部門大会 

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    Event date: 2013.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:朱鷺メッセ 新潟コンベンションセンター   Country:Japan  

  333. 超電導限流ケーブル(SFCLC)の限流特性に及ぼす運転温度分布の影響

    大澤岳士,小島寛樹,早川直樹,花井正広,大久保仁

    平成25年電気学会電力・エネルギー部門大会 

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    Event date: 2013.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:朱鷺メッセ 新潟コンベンションセンター   Country:Japan  

  334. SF6ガス中部分放電電流波形が放射電磁波の周波数特性に与える影響

    水野龍之介,花井正広,小島寛樹,早川直樹,大久保仁,吉田昌展

    平成25年電気学会電力・エネルギー部門大会 

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    Event date: 2013.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:朱鷺メッセ 新潟コンベンションセンター   Country:Japan  

  335. 真空中スパークコンディショニングにおける電流制御による耐電圧向上

    大竹泰智,小島寛樹,早川直樹,長谷川光佑,斉藤仁,榊正幸,大久保仁

    平成25年電気学会電力・エネルギー部門大会 

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    Event date: 2013.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:朱鷺メッセ 新潟コンベンションセンター   Country:Japan  

  336. Optimum Power Flow and Degradation Control of Power Apparatus by CMD with Intelligent Grid Management System (IGMS) International conference

    M. Hanai, K. Shinoda, H. Kojima, N. Hayakawa, H. Okubo

    18th International Symposium on High Voltage Engineering 

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    Event date: 2013.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  337. Electromagnetic Wave Radiation Characteristics of Partial Discharge Depending on Needle Electrode Material and Shape in SF6 Gas International conference

    R. Mizuno, H. Kojima, N. Hayakawa, M. Hanai, M. Yoshida, H. Okubo

    18th International Symposium on High Voltage Engineering 

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    Event date: 2013.8

    Language:English   Presentation type:Poster presentation  

    Country:Korea, Republic of  

  338. Transition Mechanism from Pre-Discharge to Surface Flashover on Alumina Dielectrics in Vacuum International conference

    Y. Nakano, H. Kojima, N. Hayakawa, K. Tsuchiya, H. Okubo

    18th International Symposium on High Voltage Engineering 

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    Event date: 2013.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  339. Leader Onset and Breakdown Mechanisms under Non-uniform Electric Field in Air International conference

    H. Kojima, K. Hotta, N. Hayakawa, N. Yanagita, T. Kato, T. Rokunohe, H. Okubo

    18th International Symposium on High Voltage Engineering 

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    Event date: 2013.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  340. SF6ガス中における正極性特異部分放電発生条件

    水野龍之介,小島寛樹,早川直樹,花井正広,吉田昌展,大久保仁

    平成25年電気学会全国大会 

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    Event date: 2013.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  341. GISスペーサ表面への局所傾斜導電性付与による電界低減効果

    石黒純也,中野龍之,早川直樹,小島寛樹,花井正広,加藤克巳,大久保仁

    平成25年電気学会全国大会 

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    Event date: 2013.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  342. 電力系統最適運用システム(IGMS)による機器診断に基づき系統信頼度を最大化する潮流制御

    篠田康生,深谷皇紀,小島寛樹,早川直樹,花井正広,大久保仁

    平成25年電気学会全国大会 

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    Event date: 2013.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  343. 空気中不平等電界下における2次ストリーマチャネル加熱型絶縁破壊機構

    堀田克輝,北村卓也,小島寛樹,早川直樹,柳田憲史,加藤達朗,六戸敏昭,大久保仁

    平成25年電気学会全国大会 

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    Event date: 2013.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  344. 真空中アルミナ絶縁物沿面における交流部分放電現象と電荷挙動

    石田真之,小島寛樹,花井正広,早川直樹,池田順一,塩入哲,大久保仁

    平成25年電気学会全国大会 

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    Event date: 2013.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  345. 真空中沿面前駆放電から絶縁破壊への転移メカニズム

    中野裕介,小島寛樹,早川直樹,土屋賢治,大久保仁

    平成25年電気学会全国大会 

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    Event date: 2013.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  346. 超電導ケーブルの電気絶縁技術における現状と課題

    早川直樹,西町誠一郎,小島寛樹,花井正広,大久保仁

    電気学会誘電・絶縁材料/電線・ケ-ブル合同研究会 

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    Event date: 2012.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛知県産業労働センター   Country:Japan  

  347. Pressure and Temperature Dependence of Breakdown Characteristics of Sub-Cooled Liquid Nitrogen International conference

    S. Nishimachi, N. Hayakawa, H. Kojima, M. Hanai, H. Okubo

    IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2012.10

    Language:English   Presentation type:Poster presentation  

    Country:Canada  

    DOI: 10.1109/CEIDP.2012.6378814

    Scopus

  348. Influence of Local Degradation in Critical Current for Superconducting Fault Current Limiting Cable (SFCLC) International conference

    H. Kojima, T. Osawa, F. Kato, N. Hayakawa, M. Hanai, H. Okubo

    Applied Superconductivity Conference 

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    Event date: 2012.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  349. Feasibility Study on Superconducting Power Flow Controller and Fault Current Limiter (SPFCL) International conference

    N. Hayakawa, X. Mao, H. Kojima, M. Hanai, H. Okubo, N. Kashima, S. Nagaya, S. Sugimoto

    Applied Superconductivity Conference 

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    Event date: 2012.10

    Language:English   Presentation type:Poster presentation  

    Country:United States  

  350. サブクール液体窒素の交流絶縁破壊メカニズム

    西町誠一郎,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年度電気関係学会東海支部連合大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋技術科学大学   Country:Japan  

  351. 空気中不平等電界下における2次ストリーマ到達条件

    堀田克輝,小島寛樹,早川直樹,柳田憲史,加藤達朗,六戸敏昭,大久保仁

    平成24年度電気関係学会東海支部連合大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋技術科学大学   Country:Japan  

  352. 真空中交流部分放電における電界分布の影響

    石田真之,小島寛樹,花井正広,早川直樹,本間三孝,塩入哲,大久保仁

    平成24年度電気関係学会東海支部連合大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋技術科学大学   Country:Japan  

  353. Cu-Cr棒電極を用いたマルチギャップ電極系における真空中インパルスコンディショニング特性

    大竹泰智,小島寛樹,早川直樹,大久保仁,長谷川光佑,斉藤仁

    平成24年度電気関係学会東海支部連合大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋技術科学大学   Country:Japan  

  354. 真空中アルミナ絶縁物におけるインパルス沿面放電前駆放電の発光要因

    中野裕介,小島寛樹,早川直樹,土屋賢治,大久保仁

    平成24年度電気関係学会東海支部連合大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋技術科学大学   Country:Japan  

  355. TiO2ナノ粒子分散による鉱油の電気絶縁特性向上に関する検討

    細見聡彦,花井正広,小島寛樹,早川直樹,大久保仁

    平成24年度電気関係学会東海支部連合大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋技術科学大学   Country:Japan  

  356. SF6ガス中部分放電放射電磁波特性の金属異物材質依存性

    水野龍之介,鈴木啓介,小島寛樹,早川直樹,花井正広,吉田昌展,大久保仁

    平成24年度電気関係学会東海支部連合大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:豊橋技術科学大学   Country:Japan  

  357. Discrimination Technique of Streamer and Leader Type of Partial Discharge in SF6 Gas Using UHF Method International conference

    M. Hanai, K. Suzuki, R. Mizuno, H. Kojima, N. Hayakawa, H. Okubo

    2012 IEEE International Conference on Condition Monitoring and Diagnosis 

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    Event date: 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Indonesia  

    DOI: 10.1109/CMD.2012.6416437

    Scopus

  358. Optimum Power Flow Control Based on Power Apparatus Diagnosis by Intelligent Grid Management System (IGMS) International conference

    M. Hanai, K. Shinoda, K. Wakaiki, H. Kojima, N. Hayakawa, H. Okubo

    2012 IEEE International Conference on Condition Monitoring and Diagnosis 

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    Event date: 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Indonesia  

    DOI: 10.1109/CMD.2012.6416205

    Scopus

  359. Optimum Maintenance Plan of Electric Power Apparatus in Consideration of Maintenance History by Intelligent Grid Management System (IGMS) International conference

    K. Shinoda, M. Hanai, K. Wakaiki, H. Kojima, N. Hayakawa, H. Okubo

    2012 IEEE International Conference on Condition Monitoring and Diagnosis 

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    Event date: 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Indonesia  

    DOI: 10.1109/CMD.2012.6416195

    Scopus

  360. 真空中におけるインパルス沿面放電の前駆発光特性

    中野裕介,小島寛樹,早川直樹,土屋賢治,大久保仁

    平成24年電気学会基礎・材料・共通部門大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:秋田大学   Country:Japan  

  361. 真空中のセラミック表面の発光開始電圧に与える電極表面粗さの影響

    浅利直紀,塩入哲,佐藤純一,本間三孝,小島寛樹,花井正広,早川直樹,大久保仁

    平成24年電気学会基礎・材料・共通部門大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:秋田大学   Country:Japan  

  362. Streamer Development Mechanism under Non-uniform Electric Field in Air International conference

    K. Hotta, H. Kojima, N. Hayakawa, N. Yanagita, T. Kato, T. Rokunohe, H. Okubo

    2012 International Conference on High Voltage Engineering and Application 

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    Event date: 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Shanghai   Country:China  

    DOI: 10.1109/ICHVE.2012.6357036

    Scopus

  363. UHF電磁波の二周波数同時測定によるGIS部分放電診断

    吉田昌展,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年電気学会電力・エネルギー部門大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  364. 超電導電力機器におけるサブクール液体窒素の電気絶縁性能

    西町誠一郎,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年電気学会電力・エネルギー部門大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  365. 超電導限流ケーブル(SFCLC)の運転温度を考慮した限流特性の評価

    大澤岳士,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年電気学会電力・エネルギー部門大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  366. 空気中不平等電界下におけるインパルス絶縁破壊メカニズムの類別

    堀田克輝,小島寛樹,早川直樹,柳田憲史,加藤達朗,六戸敏昭,大久保仁

    平成24年電気学会電力・エネルギー部門大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  367. SF6ガス中不平等電界下における部分放電形態とUHF電磁波特性

    水野龍之介,吉田昌展,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年電気学会電力・エネルギー部門大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  368. 電力系統最適運用システム(IGMS)による機器の更新時期を考慮した最適潮流制御

    篠田康生,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年電気学会電力・エネルギー部門大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  369. 部分放電メカニズムに基づくGIS中金属異物形状同定手法

    小島寛樹,鈴木隆文,早川直樹,花井正広,大久保仁

    平成24年電気学会電力・エネルギー部門大会 

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    Event date: 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  370. Conditioning Characteristics of Multi-Gap Electrode System in Vacuum International conference

    H. Kojima, Y. Otake, R. Nishimura, N. Hayakawa, K. Hasegawa, H. Saito, Y. Noda, H. Okubo

    25th International Symposium on Discharges and Electrical Insulation in Vacuum 

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    Event date: 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Russian Federation  

    DOI: 10.1109/DEIV.2012.6412439

    Scopus

  371. Development Process of Impulse Surface Discharge in Vacuum International conference

    Y. Nakano, H. Kojima, N. Hayakawa, K. Tsuchiya, H. Okubo

    25th International Symposium on Discharges and Electrical Insulation in Vacuum 

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    Event date: 2012.9

    Language:English   Presentation type:Poster presentation  

    Country:Russian Federation  

    DOI: 10.1109/DEIV.2012.6412467

    Scopus

  372. Charge Behavior and Partial Discharge Characteristics on Alumina Insulation under AC Voltage Application in Vacuum International conference

    M. Ishida, H. Kojima, N. Hayakawa, M. Hanai, M. Homma, T. Shioiri, H. Okubo

    25th International Symposium on Discharges and Electrical Insulation in Vacuum 

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    Event date: 2012.9

    Language:English   Presentation type:Poster presentation  

    Country:Russian Federation  

    DOI: 10.1109/DEIV.2012.6412452

    Scopus

  373. 超電導限流/潮流制御装置の電力システム導入効果

    早川直樹,毛翔,小島寛樹,花井正広,鹿島直二,長屋重夫,杉本重幸,大久保仁

    電気学会超電導応用電力機器研究会 

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    Event date: 2012.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:じばさん三重   Country:Japan  

  374. Charge Behavior in Palm Fatty Acid Ester Oil (PFAE) / Pressboard Composite Insulation System under Voltage Application International conference

    H. Kojima, N. Hayakawa, K. Kato, K. Kawanishi, H. Koide, H. Okubo

    International Symposium on Electrical Insulation 2012 

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    Event date: 2012.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Puerto Rico  

    DOI: 10.1109/ELINSL.2012.6251502

    Scopus

  375. 真空中平行平板電極系におけるインパルスコンディショニングのギャップ長依存性

    西村亮岐,小島寛樹,早川直樹,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  376. SF6中金属異物の部分放電電流波形と放射電磁波特性

    鈴木啓介,水野龍之介,小島寛樹,早川直樹,花井正広,吉田昌展,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  377. 電力系統最適運用システム(IGMS)における機器診断に基づくリアルタイム潮流制御

    若生海王,篠田康生,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  378. 電力系統最適運用システム(IGMS)による機器の将来状態推定に基づく最適潮流制御

    篠田康生,若生海王,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  379. 電力系統最適運用システム(IGMS)における潮流制御が保守戦略へ与える影響

    若生海王,篠田康生,北田裕樹,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  380. 電気光学Kerr効果による直流油浸複合絶縁系における抵抗率特性の検討

    齋藤輝,仁木康平,小島寛樹,早川直樹,加藤克巳,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  381. 電力システムにおける超電導限流/潮流制御装置の潮流制御効果と限流・復帰特性

    毛翔,小島寛樹,早川直樹,花井正広,大久保仁,鹿島直二,長屋重夫,杉本重幸

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  382. 超電導限流ケーブル(SFCLC)における臨界電流の局所的劣化の限流特性への影響評価

    加藤史彦,大澤岳士,小島寛樹,早川直樹,花井正広,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  383. 275kV高温超電導ケーブルにおける複合段絶縁による高電圧化と誘電損失低減の両立

    井上真彰,西町誠一郎,小島寛樹,早川直樹,花井正広,丸山修,大熊武,八木正史,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  384. 空気中不平等電界下における絶縁破壊に至るストリーマチャネルの進展メカニズム

    堀田克輝,小島寛樹,早川直樹,柳田憲史,加藤達朗,六戸敏昭,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  385. 真空中インパルス沿面における電荷挙動と放電進展過程

    中野裕介,小島寛樹,早川直樹,土屋賢治,大久保仁

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  386. 真空中Cu-Cr電極系におけるインパルスコンディショニング過程と陰極表面状態

    西村亮岐,大竹泰智,小島寛樹,早川直樹,大久保仁,佐藤裕昌,斉藤仁,野田泰司

    平成24年電気学会全国大会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工業大学   Country:Japan  

  387. 超電導限流ケーブルの開発に関する基礎研究

    小島寛樹

    パワーアカデミー研究助成 2012年成果報告会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:広島工業大学 五日市キャンパス ネクサス21 501会場   Country:Japan  

  388. 真空中インパルス沿面放電進展過程におけるアルミナ絶縁物上電荷挙動

    中野裕介,小島寛樹,早川直樹,土屋賢治,大久保仁

    電気学会放電研究会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:埼玉大学   Country:Japan  

  389. 真空中マルチギャップ電極系におけるコンディショニング特性

    大竹泰智,西村亮岐,小島寛樹,早川直樹,長谷川光佑,斉藤仁,野田泰司,大久保仁

    電気学会放電研究会 

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    Event date: 2012.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:埼玉大学   Country:Japan  

  390. Propagation Process of Impulse Surface Flashover on Alumina Dielectrics in Vacuum International conference

    Y. Nakano, H. Kojima, N. Hayakawa, K. Tsuchiya, H. Okubo

    International Symposium on EcoTopia Science 2011 

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    Event date: 2011.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  391. Partial Discharge in Vacuum on Insulator Surface under AC Voltage Application International conference

    H. Kojima, K. Aoki, N. Hayakawa, M. Hanai, M. Homma, T. Shioiri, H. Okubo

    1st International Conference on Electric Power Equipment - Switching Technology 

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    Event date: 2011.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

    DOI: 10.1109/ICEPE-ST.2011.6123044

    Scopus

  392. Surface Flashover Propagation Process on Alumina Dielectrics under Impulse Voltage Application in Vacuum International conference

    H. Kojima, Y. Nakano, N. Hayakawa, K. Tsuchiya, H. Okubo

    1st International Conference on Electric Power Equipment - Switching Technology 

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    Event date: 2011.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

    DOI: 10.1109/ICEPE-ST.2011.6123046

    Scopus

  393. Impulse Breakdown Mechanism Based on Discharge Propagation Process under Non-uniform Electric Field in Air International conference

    K. Hotta, T. Iwata, H. Kojima, N. Hayakawa, N. Yanagita, T. Kato, T. Rokunohe, H. Okubo

    2011 IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2011.10

    Language:English   Presentation type:Poster presentation  

    Country:Mexico  

    DOI: 10.1109/CEIDP.2011.6232712

    Scopus

  394. 電力機器の経年分布と故障率を考慮した潮流制御を行う電力系統最適運用システム(IGMS)

    若生海王,篠田康生,小島寛樹,早川直樹,花井正広,大久保仁

    電気学会電力技術/電力系統技術合同研究会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:常翔学園 大阪センター   Country:Japan  

  395. 超電導限流ケーブル(SFCLC)の限流・復帰特性の冷却構造依存性

    加藤史彦,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年度電気関係学会東海支部連合大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三重大学   Country:Japan  

  396. 空気中不平等電界下のインパルス絶縁破壊における2次ストリーマ発生条件に関する検討

    堀田克輝,小島寛樹,早川直樹,柳田憲史,加藤達朗,六戸敏昭,大久保仁

    平成23年度電気関係学会東海支部連合大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三重大学   Country:Japan  

  397. 機器診断を基に最適な潮流制御を行う電力系統最適運用システム(IGMS)

    若生海王,篠田康生,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年度電気関係学会東海支部連合大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三重大学   Country:Japan  

  398. 電力機器の劣化推移を考慮した電力機器運用最適化システム(IGMS)による最適潮流制御

    篠田康生,若生海王,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年度電気関係学会東海支部連合大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三重大学   Country:Japan  

  399. 半円ダイポールアンテナのスリット幅とアンテナ特性の関係

    鈴木啓介,小島寛樹,早川直樹,花井正広,吉田昌展,大久保仁

    平成23年度電気関係学会東海支部連合大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三重大学   Country:Japan  

  400. 275kV高温超伝導ケーブルにおける誘電損失低減に関する検討

    井上真彰,小島寛樹,早川直樹,花井正広,大久保仁,丸山修,大熊武,八木正史

    平成23年度電気関係学会東海支部連合大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三重大学   Country:Japan  

  401. 超電導限流/潮流制御装置による電力システムの潮流制御効果

    毛翔,小島寛樹,早川直樹,花井正広,大久保仁,鹿島直二,長屋重夫,杉本重幸

    平成23年度電気関係学会東海支部連合大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:三重大学   Country:Japan  

  402. 真空中インパルス沿面放電進展過程の絶縁物上電界分布依存性

    中野裕介,小島寛樹,早川直樹,土屋賢治,大久保仁

    平成23年電気学会基礎・材料・共通部門大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京工業大学   Country:Japan  

  403. 湿度を考慮した気中部分放電開始の解析的検討

    加藤達朗,柳田憲史,六戸敏昭,堀田克輝,小島寛樹,早川直樹,大久保仁

    平成23年電気学会基礎・材料・共通部門大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京工業大学   Country:Japan  

  404. 真空中インパルスコンディショニング過程におけるCu-Cr微細分散層の形成に関する検討

    西村亮岐,小島寛樹,早川直樹,佐藤裕昌,斉藤仁,野田泰司,大久保仁

    平成23年電気学会基礎・材料・共通部門大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京工業大学   Country:Japan  

  405. 空気中不平等電界下における2次ストリーマ進展と導電路形成プロセス

    堀田克輝,小島寛樹,早川直樹,柳田憲史,加藤達朗,六戸敏昭,大久保仁

    平成23年電気学会基礎・材料・共通部門大会 

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    Event date: 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京工業大学   Country:Japan  

  406. Current Limitation and Recovery Function for Superconducting Fault Current Limiting Transformer (SFCLT) International conference

    N. Hayakawa, T. Kito, J. Himbele, H. Kojima, M. Hanai, H. Okubo

    Superconductivity Centennial Conference 2011 

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    Event date: 2011.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Netherlands  

  407. Recent Progress in Electrical Insulation Techniques for HTS Power Apparatus International conference

    N. Hayakawa, H. Kojima, M. Hanai, H. Okubo

    Superconductivity Centennial Conference 2011 

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    Event date: 2011.9

    Language:English   Presentation type:Poster presentation  

    Country:Netherlands  

  408. Superconducting Fault Current Limiting Cable (SFCLC) with Current Limiting and Recovery Function International conference

    H. Kojima, F. Kato, N. Hayakawa, M. Hanai, H. Okubo

    Superconductivity Centennial Conference 2011 

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    Event date: 2011.9

    Language:English   Presentation type:Poster presentation  

    Country:Netherlands  

  409. Maintenance Optimization of Power Apparatus by Intelligent Grid Management System (IGMS) and Upgrading by Partial Maintenance International conference

    M. Hanai, K. Wakaiki, Y. Suzuki, H. Kojima, N. Hayakawa, H. Okubo

    CIGRE SC A2 & D1 Joint Colloquium 2011 

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    Event date: 2011.9

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  410. Electrical Insulation and Discharge Characteristics at HVDC Polarity Reversal in Oil/Pressboard Composite Insulation System International conference

    H. Kojima, H. Saito, N. Hayakawa, K. Kato, H. Okubo

    CIGRE SC A2 & D1 Joint Colloquium 2011 

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    Event date: 2011.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  411. 電力系統最適運用システム(IGMS)における保守履歴を考慮した電力機器の最適保守計画

    篠田康生,若生海王,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年電気学会電力・エネルギー部門大会 

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    Event date: 2011.8 - 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福井大学   Country:Japan  

  412. 電力系統最適運用システム(IGMS)による機器劣化を考慮した最適潮流制御

    若生海王,篠田康生,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年電気学会電力・エネルギー部門大会 

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    Event date: 2011.8 - 2011.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福井大学   Country:Japan  

  413. Influence of Gap Length on Discharge Channel Propagation and Breakdown Mechanism in Air International conference

    H. Kojima, K. Hotta, T. Iwata, N. Hayakawa, N. Yanagita, T. Kato, T. Rokunohe, H. Okubo

    17th International Symposium on High Voltage Engineering 

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    Event date: 2011.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  414. Identification of Insulation Defect by Sequential Measurement of Partial Discharge in GIS International conference

    M. Yoshida, K. Suzuki, H. Kojima, N. Hayakawa, M. Hanai, H. Okubo

    17th International Symposium on High Voltage Engineering 

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    Event date: 2011.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  415. Correlation between UHF Electromagnetic Waveforms and Partial Discharge Current Waveforms in GIS International conference

    K. Suzuki, M. Yoshida, H. Kojima, N. Hayakawa, M. Hanai, H. Okubo

    17th International Symposium on High Voltage Engineering 

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    Event date: 2011.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  416. Partial Discharge Characteristics for Delamination Defect of Epoxy Cast Resin Power Apparatus International conference

    D.-E.A. Mansour, H. Kojima, N. Hayakawa, M. Hanai, H. Okubo

    17th International Symposium on High Voltage Engineering 

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    Event date: 2011.8

    Language:English   Presentation type:Poster presentation  

    Country:Germany  

  417. Charge Behavior in Palm Fatty Acid Ester Oil (PFAE) / Pressboard Composite Insulation System with Charged Oil Flow International conference

    H. Saito, H. Kojima, N. Hayakawa, K. Kato, K. Kawanishi, H. Koide, H. Okubo

    International Conference on Dielectric Liquid 2011 

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    Event date: 2011.6

    Language:English   Presentation type:Poster presentation  

    Country:Norway  

    DOI: 10.1109/ICDL.2011.6015445

    Scopus

  418. Discharge Mechanism at HVDC Polarity Reversal in Oil/Pressboard Composite Insulation System International conference

    H. Kojima, H. Saito, N. Hayakawa, K. Kato, H. Okubo

    International Conference on Dielectric Liquid 2011 

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    Event date: 2011.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Norway  

    DOI: 10.1109/ICDL.2011.6015443

    Scopus

  419. 超電導限流変圧器(SFCLT)における限流・復帰特性の技術的評価

    ヒンブルジョンジェイサード,鬼頭豊明,小島寛樹,早川直樹,花井正広,大久保仁

    電気学会超電導応用電力機器研究会 

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    Event date: 2011.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:産業技術総合研究所 臨海副都心センター   Country:Japan  

  420. 真空中アルミナ絶縁物上負極性インパルス沿面放電進展メカニズム

    石田亜成,中野裕介,小島寛樹,早川直樹,土屋賢治,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  421. 電力系統最適運用システム(IGMS)における保守時期と保守費用対効果の関係

    鈴木陽太郎,若生海王,篠田康生,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  422. SF6中交流部分放電と検出UHF電磁波との相関性の検討

    鈴木隆文,岩田健,小島寛樹,早川直樹,花井正広,植田玄洋,岡部成光,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  423. GIS中における部分放電電流波形とUHF放射電磁波の相関に関する検討

    鈴木啓介,吉田昌展,小島寛樹,早川直樹,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  424. 電力系統最適運用システム(IGMS)における最適潮流制御に無効電力が与える影響

    若生海王,鈴木陽太郎,篠田康生,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  425. パームヤシ脂肪酸エステル(PFAE)/プレスボード複合絶縁系における帯電油流動時の油中電荷挙動

    齋藤輝,小島寛樹,早川直樹,加藤克巳,小出英延,川西啓造,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  426. 伝導冷却SMESコイルモデルの部分放電開始特性

    井上真彰,小島寛樹,早川直樹,花井正広,式町浩二,平野直樹,長屋重夫,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  427. 次世代電力システムにおける超電導限流/潮流制御装置の適用可能性

    毛翔,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  428. 超電導限流ケーブル(SFCLC)の限流・復帰機能特性評価

    加藤史彦,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  429. 超電導限流変圧器(SFCLT)の復帰特性評価

    鬼頭豊明,ヒンブルジョン,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  430. 過冷却液体窒素中における超電導ケーブル絶縁モデルの部分放電開始特性

    早川直樹,鵜飼泰之,小島寛樹,花井正広,大久保仁,丸山修,大熊武,八木正史

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  431. SF6ガス中インパルス放電進展過程におけるリーダ転移機構の考察

    細井勇佑,鈴木隆文,小島寛樹,早川直樹,花井正広,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  432. 空気中におけるインパルス絶縁破壊前駆導電路の形成過程

    堀田克輝,岩田健,小島寛樹,早川直樹,柳田憲史,加藤達朗,六戸敏昭,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  433. 空気中インパルス絶縁破壊現象の高速放電測定と放電進展メカニズム

    岩田健,堀田克輝,小島寛樹,早川直樹,柳田憲史,加藤達朗,六戸敏昭,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  434. 真空中Cu-Cr電極コンディショニングにおける微細分散層形成プロセスに関する検討

    西村亮岐,小島寛樹,早川直樹,佐藤裕昌,斉藤仁,野田泰司,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  435. 真空中交流電圧印加時における絶縁物沿面の部分放電メカニズム

    青木圭太,小島寛樹,早川直樹,本間三孝,塩入哲,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  436. 真空中交流電圧印加時における絶縁物沿面の部分放電現象

    小島寛樹,青木圭太,早川直樹,本間三孝,塩入哲,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  437. 真空中のセラミック表面での部分放電現象の調査

    塩入哲,浅利直紀,佐藤純一,竹井義博,本間三孝,青木圭太,小島寛樹,大久保仁

    平成23年電気学会全国大会 

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    Event date: 2011.3

    Language:Japanese  

    Venue:大阪大学   Country:Japan  

  438. International Conference on Condition Monitoring and Diagnosis 2010 (CMD2010) 開催報告

    高橋俊裕,岡本達希,早川直樹,小島寛樹

    電気学会誘電・絶縁材料研究会 

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    Event date: 2011.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:ハートピア熱海   Country:Japan  

  439. 気中放電開始モデルと湿度の影響に関する基礎検討

    柳田憲史,加藤達朗,六戸敏昭,岩田健,小島寛樹,早川直樹,大久保仁

    電気学会放電/誘電・絶縁材料/高電圧合同研究会 

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    Event date: 2011.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:ホテル メリージュ   Country:Japan  

  440. 超電導限流ケーブル(SFCLC)の自己復帰機能を考慮した適用可能性評価

    加藤史彦,小島寛樹,早川直樹,花井正広,大久保仁

    電気学会超電導応用電力機器研究会 

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    Event date: 2011.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:住友電気工業(株) 大阪製作所   Country:Japan  

  441. 2MVA級超電導限流変圧器(SFCLT)の限流・超電導復帰特性

    鬼頭豊明,小島寛樹,早川直樹,花井正広,大久保仁

    電気学会静止器研究会 

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    Event date: 2010.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:電気学会   Country:Japan  

  442. Recent Status and Future Perspective of Superconducting Fault Current Limiting Transformer (SFCLT)

    N. Hayakawa, H. Kojima, M. Hanai, H. Okubo

    23rd International Symposium on Superconductivity 

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    Event date: 2010.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  443. Breakdown Characteristics in Oil/Pressboard-composite Insulation System at HVDC Polarity Reversal International conference

    H. Okubo, T. Nara, H. Saito, H. Kojima, N. Hayakawa, K. Kato

    2010 IEEE Conference on Electrical Insulation and Dielectric Phenomena 

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    Event date: 2010.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

    DOI: 10.1109/CEIDP.2010.5724003

    Scopus

  444. Improvement of Cu-Cr Electrode Surface under Impulse Voltage Conditioning in Vacuum International conference

    2010 International Conference on High Voltage Engineering and Application 

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    Event date: 2010.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

    DOI: 10.1109/ICHVE.2010.5640856

    Scopus

  445. Electric Field Optimization of Floating Electrode Configuration in Vacuum Interrupter International conference

    2010 International Conference on High Voltage Engineering and Application 

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    Event date: 2010.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

    DOI: 10.1109/ICHVE.2010.5640872

    Scopus

  446. Positive Streamer Propagation and Breakdown Characteristics in Non-uniform Air Gap International conference

    T. Iwata, H. Kojima, N. Hayakawa, F. Endo, N. Yanagita, T. Kato, T. Rokunohe, H. Okubo

    2010 International Conference on High Voltage Engineering and Application 

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    Event date: 2010.10

    Language:English   Presentation type:Poster presentation  

    Country:United States  

    DOI: 10.1109/ICHVE.2010.5640749

    Scopus

  447. 将来の最適電力システムを目指して -診断・監視・運用・機器開発-

    花井正広,遠藤奎将,小島寛樹,早川直樹,大久保仁

    電気学会電力技術/電力系統技術合同研究会 

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    Event date: 2010.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  448. 気中放電における1次及び2次ストリーマ進展モデルの基礎検討

    柳田憲史,加藤達朗,六戸敏昭,岩田健,小島寛樹,早川直樹,遠藤奎将,大久保仁

    平成22年電気学会基礎・材料・共通部門大会 

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    Event date: 2010.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:琉球大学   Country:Japan  

  449. Cu-Cr電極系における真空中インパルスコンディショニング過程と電極表面状態に関する検討

    西村亮岐,小島寛樹,佐藤裕昌,斉藤仁,野田泰司,早川直樹,大久保仁

    平成22年電気学会基礎・材料・共通部門大会 

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    Event date: 2010.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:琉球大学   Country:Japan  

  450. Optimum Strategy of Power System Maintenance and Operation with Intelligent Grid Management System (IGMS)

    International Conference on Condition Monitoring and Diagnosis 2010 

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    Event date: 2010.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  451. Charge Behavior in Palm Fatty Acid Ester Oil (PFAE) / Pressboard Composite Insulation System under Electrification Flow

    H. Saito, T. Nara, K. Kato, H. Kojima, H. Zheng, H. Koide, H. Okubo

    International Conference on Condition Monitoring and Diagnosis 2010 

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    Event date: 2010.9

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  452. Partial Discharge Signal Evaluation of UHF Technique in Accordance with Current Pulse Waveform Measurement

    M. Yoshida, K. Suzuki, H. Kojima, N. Hayakawa, M. Hanai, F. Endo, H. Okubo

    International Conference on Condition Monitoring and Diagnosis 2010 

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    Event date: 2010.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  453. Optimum Maintenance Strategies Based on Circuit Breaker Diagnoses for Total Cost Minimization of Electric Power System Operation

    Y. Suzuki, K. Wakaiki, H. Kojima, N. Hayakawa, M. Hanai, F. Endo, H. Okubo

    International Conference on Condition Monitoring and Diagnosis 2010 

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    Event date: 2010.9

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  454. Particle-Initiated Partial Discharge Characteristics for GIS Diagnosis

    K. Suzuki, M. Asai, H. Kojima, N. Hayakawa, F. Endo, M. Yoshida, H. Okubo

    International Conference on Condition Monitoring and Diagnosis 2010 

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    Event date: 2010.9

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  455. 金属異物存在下におけるSF6ガス中部分放電電流・放射電磁波スペクトル特性

    鈴木啓介,吉田昌展,小島寛樹,早川直樹,遠藤奎将,花井正広,大久保仁

    平成22年電気学会電力・エネルギー部門大会 

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    Event date: 2010.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  456. 超電導限流ケーブル(HTS-FCL Cable)の導入と限流・復帰に関する考察

    加藤史彦,小島寛樹,早川直樹,花井正広,大久保仁

    平成22年電気学会電力・エネルギー部門大会 

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    Event date: 2010.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  457. 超電導限流変圧器(SFCLT)の限流・復帰シミュレーション

    鬼頭豊明,小島寛樹,早川直樹,花井正広,大久保仁

    平成22年電気学会電力・エネルギー部門大会 

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    Event date: 2010.9 </