Updated on 2023/09/21

写真a

 
HAYAKAWA, Naoki
 
Organization
Graduate School of Engineering Electrical Engineering 1 Professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Electrical Engineering, Electronics, and Information Engineering
Title
Professor
Contact information
メールアドレス

Degree 1

  1. 工学博士 ( 1991.1   名古屋大学 ) 

Research Areas 1

  1. Others / Others  / Electric Power Engineering and Electrical Machinery

Current Research Project and SDGs 3

  1. Development of Superconducting Power Apparatus and Systems

  2. Charging and Discharge Phenomena in High Voltage Power Apparatus

  3. Development of Environmentally Benign Energy Apparatus and Systems

Education 2

  1. Nagoya University   Graduate School, Division of Engineering

    - 1990

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    Country: Japan

  2. Nagoya University   Faculty of Engineering

    - 1985

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    Country: Japan

Professional Memberships 5

  1. 電気学会

  2. IEEE

  3. CIGRE

  4. 低温工学協会

  5. 放電学会

Awards 12

  1. 電気学会 電気学術振興賞論文賞

    2023.5   電気学会  

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    Country:Japan

  2. CIGREパリ大会日本論文優秀賞

    2022.7   日本CIGRE国内委員会  

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    Country:Japan

  3. 電気学会 優秀技術活動賞(技術報告賞)

    2022.6   電気学会  

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    Country:Japan

  4. 電気学会 電気学術振興賞論文賞

    2018.5   電気学会  

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    Country:Japan

  5. 電気学会 優秀技術活動賞(技術報告賞)

    2014.5   電気学会  

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    Country:Japan

  6. 電気学会 電気学術振興賞論文賞

    2013.5   電気学会  

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    Country:Japan

  7. 電気学会 電気学術振興賞論文賞

    2013.5   電気学会  

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    Country:Japan

  8. 低温工学協会 大島賞優良発表賞

    2008.5   低温工学協会  

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    Country:Japan

  9. 電気学会 電気学術振興賞論文賞

    2005.5   電気学会  

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    Country:Japan

  10. 電気学会 電気学術振興賞進歩賞

    2003.5   電気学会  

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    Country:Japan

  11. 低温工学協会 大島賞優良発表賞

    2000.5   低温工学協会  

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    Country:Japan

  12. 電気学会 電気学術振興賞論文賞

    1996.5   電気学会  

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    Country:Japan

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Papers 125

  1. コンデンサ形計器用変圧器の期待寿命評価方法および部分放電進展特性 Reviewed

    永木雄也,林恭平,小島寛樹,吉田昌展,大谷彰,早川直樹

    電気学会論文誌B     2023

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

  2. Breakdown Charge Dependence of Counter Electrode Material Adhesion and Dielectric Strength after Spark Conditioning in Vacuum Reviewed

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

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION     2023

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

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

    N.Hayakawa, Y.Mori, H.Kojima

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION   Vol. 29 ( 1 ) page: 264 - 269   2022

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

  4. Development of Sophisticated Cone-Type Insulating Spacer for 245 kV Class GIS by Functional Insulating Materials Reviewed

    K.Okamoto, N.Hayakawa, M.Hikita, H.Okubo, K.Kato, N.Osawa

    CIGRE Paris Session   Vol. 10648   2022

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

  5. Electric Field Grading and Discharge Inception Voltage Improvement on HVDC GIS/GIL Spacer with Permittivity and Conductivity Graded Materials (ε/σ-FGM) Reviewed

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

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION   Vol. 29 ( 5 ) page: 1811 - 1817   2022

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

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

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

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION   Vol. 29 ( 3 ) page: 1160 - 1166   2022

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

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

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

      Vol. 141 ( 10 )   2021.10

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

      Vol. 141 ( 4 ) page: 260-268   2021.4

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

  9. DC Electric Field Distribution under Gas-Conductivity-Dominant Condition in Gas-Solid Composite Insulation Systems Reviewed

      Vol. 141 ( 2 ) page: 156-163   2021.2

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  10. Dielectric characteristics of liquid nitrogen / synthetic paper composite insulation system for extra high voltage HTS cable Reviewed

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

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   Vol. 31 ( 5 )   2021

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    Web of Science

  11. Time and Space Transition of DC Electric Field Distribution Based on Emerging Field by Accumulated Charge in Gas-solid Composite Insulation Structure Reviewed

    R.Nakane, N.Hayakawa, H.Okubo

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION     2021

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

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

    R.Nakane, H.Kojima, N.Hayakawa

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION     2021

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  13. Electric Field Simulation of Permittivity and Conductivity Graded Materials (e/s-FGM) for HVDC GIS Spacers Reviewed International coauthorship

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

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION     2021

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

    Web of Science

  14. Alternative Test Method of Internal Arcing for Replacing SF6 by Air in SF6 Insulated Power Equipment Reviewed

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

    Engineering Research Express   Vol. 3 ( 035005 )   2021

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

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

      Vol. 140 ( 7 ) page: 349-356   2020.7

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  16. 絶縁油-プレスボード複合絶縁構成における直流電界ストレスの時間・空間推移特性 Reviewed

    中根龍一,加藤克巳, 早川直樹,大久保仁

    電気学会論文誌A   Vol. 140 ( 2 ) page: 56-63   2020.2

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

  17. インバータ駆動機におけるカーボン遊離現象の基礎検討 Reviewed

    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

    電気学会論文誌A   Vol. 140 ( 1 ) page: 40-47   2020.1

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

    N.Hayakawa, Y.Mori, H.Kojima

    Journal of Physics: Conference Series (JPCS)   Vol. 1559   page: 12138   2020

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  19. Quench-induced Dynamic Breakdown Characteristics of HTS Pancake Coil Model in Liquid Nitrogen for Resistive SFCL Invited Reviewed

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

    Journal of Physics: Conference Series (JPCS)   Vol. 1559   page: 12100   2020

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  20. Resin injection behavior in process of manufacturing insulation spacer with permittivity gradient using computational fluid dynamics

    Imai Takahiro, Hoshina Yoshikazu, Kojima Hiroki, Hayakawa Naoki

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION   Vol. 26 ( 5 ) page: 1669-1677   2019.10

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

    DOI: 10.1109/TDEI.2019.008239

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  21. Comparison of permittivity gradient in resin injected and simulated cone-shaped spacers

    Imai Takahiro, Takeuchi Miwa, Hoshina Yoshikazu, Kojima Hiroki, Hayakawa Naoki

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION   Vol. 26 ( 5 ) page: 1678-1685   2019.10

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

    DOI: 10.1109/TDEI.2019.008240

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  22. Dynamic Breakdown Characteristics of a Pancake Coil Model for Resistive-Type Superconducting Fault Current Limiters

    Hayakawa Naoki, Mimbu Masataka, Kojimao Hiroki, Isojima Shigeki, Kuwata Minoru

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   Vol. 29 ( 5 )   2019.8

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

    DOI: 10.1109/TASC.2019.2909200

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  23. 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 Reviewed

    梶武文,浅井洋光,小島寛樹,早川直樹

    電気学会論文誌A   Vol. 139 ( 1 ) page: 30-37   2019.1

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

  24. Simulation on Discharge Inception Voltage Improvement of GIS Spacer with Permittivity Graded Materials (epsilon-FGM) Using Flexible Mixture Casting Method

    Hayakawa Naoki, Miyaji Yoshitaka, Kojima Hiroki, Kato Katsumi

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION   Vol. 25 ( 4 ) page: 1318-1323   2018.8

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

    DOI: 10.1109/TDEI.2018.007236

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

    Hayakawa Naoki, Ishida Kazuki, Mimbu Masataka, Kojima Hiroki, Isojima Shigeki, Kuwata Minoru

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   Vol. 28 ( 4 )   2018.6

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    DOI: 10.1109/TASC.2018.2799308

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  26. Fault Current Limitation Coordination in Electric Power Grid With Superconducting Fault Current Limiters

    Hayakawa Naoki, Maeno Yuya, Kojima Hiroki

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   Vol. 28 ( 4 )   2018.6

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    DOI: 10.1109/TASC.2018.2818279

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  27. 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 Reviewed

    宮路仁崇,小島寛樹, 加藤克巳,早川直樹

    電気学会論文誌A   Vol. 138 ( 4 ) page: 155-162   2018

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  28. Discharge Pattern Discrimination in Vacuum Interrupter with Non-contact Measurement of Shield Potential

    Kong Fei, Kojima Hiroki, Hayakawa Naoki, Kimura Toshinori, Tsukima Mitsuru

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION   Vol. 24 ( 5 ) page: 3265-3269   2017.10

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

    DOI: 10.1109/TDEI.2017.006512

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  29. Optimum Breakdown Charge for Maximum Dielectric Strength in Spark Conditioning in Vacuum under a Non-uniform Electric Field

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

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION   Vol. 24 ( 4 ) page: 2660-2665   2017.8

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    DOI: 10.1109/TDEI.2017.006462

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  30. Electrical Insulation Characteristics and Mechanisms of Low Dielectric Loss Materials for High-Voltage HTS Cables

    Hayakawa Naoki, Ishida Kazuki, Matsuoka Tatsuya, Kojima Hiroki

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   Vol. 27 ( 4 )   2017.6

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    DOI: 10.1109/TASC.2016.2645796

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  31. Breakdown Characteristics and Mechanisms of Liquid Nitrogen Under Transient Thermal Stress for Superconducting Fault Current Limiters

    Hayakawa Naoki, Matsuoka Tatsuya, Kojima Hiroki, Isojima Shigeki, Kuwata Minoru

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   Vol. 27 ( 4 )   2017.6

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

    DOI: 10.1109/TASC.2017.2651115

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

    Rokunohe Toshiaki, Kato Tatsuro, Kojima Hiroki, Hayakawa Naoki, Okubo Hitoshi

    IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION   Vol. 24 ( 2 ) page: 1123-1130   2017.4

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    DOI: 10.1109/TDEI.2017.005920

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  33. ナノ粒子添加絶縁油の交流電気絶縁破壊電圧の向上メカニズム Reviewed

    小島寛樹,近藤貴文,花井正広,早川直樹

    電気学会論文誌A   Vol. 137 ( 2 ) page: 101-106   2017

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 23 ( 1 ) page: 35-42   2016

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  35. 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 Reviewed

    脇本亨,小島寛樹,早川直樹

    電気学会論文誌A   Vol. 136 ( 3 ) page: 121-127   2016

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  36. 真空中沿面フラッシオーバ進展過程における絶縁物上過渡帯電存在時の実効的2次電子放出係数 Reviewed

    中野裕介,小島寛樹,土屋賢治,早川直樹

    電気学会論文誌A   Vol. 136 ( 3 ) page: 128-134   2016

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  37. Pressure Dependence and Size Effect of LN2 Breakdown Characteristics under Transient Thermal Stress Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 26 ( 3 ) page: 7700604   2016

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 23 ( 2 ) page: 1219-1225   2016

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  39. Discharge Characteristics for Various Discharge Patterns under Negative Lightning Impulse Voltage in Vacuum Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 23 ( 2 ) page: 813-818   2016

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 23 ( 1 ) page: 547-554   2016

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  41. Classification of Impulse Breakdown Mechanisms under Non-uniform Electric Field in Air Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 23 ( 1 ) page: 194-201   2016

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  42. Analysis of Conditioning and Damaging Process in Vacuum Based on Breakdown Probability Distribution Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 23 ( 1 ) page: 43-48   2016

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  43. Dependence of Spark Conditioning on Breakdown Charge and Electrode Material under a Non-Uniform Electric Field Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 23 ( 5 ) page: 3224-3230   2016

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  44. 真空中の複合絶縁系における放電パターンの識別 Reviewed

    孔飛,小島寛樹,木村俊則,月間満,早川直樹

    電気学会論文誌A   Vol. 136 ( 9 ) page: 594-602   2016

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

    T.Wakimoto, H.Kojima, N.Hayakawa

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 23 ( 6 ) page: 3566-3574   2016

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  46. Experimental Results of 275 kV-3 kA REBCO HTS Power Cable Reviewed

    M.Yagi, J.Liu, S.Mukoyama, T.Mitsuhashi, J.Teng, N.Hayakawa, X.Wang, A.Ishiyama,

    IEEE Trans. on Applied Superconductivity   Vol. 25 ( 3 ) page: 5401405   2015

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  47. Fault Current Limitation Coordination in Power Transmission System with Superconducting Fault Current Limiting Cables (SFCLC) Reviewed

    H.Kojima, T.Osawa, N.Hayakawa

    IEEE Trans. on Applied Superconductivity   Vol. 25 ( 3 ) page: 5401904   2015

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

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

    IEEE Trans. on Applied Superconductivity   Vol. 25 ( 3 ) page: 7700304   2015

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

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

      Vol. 135 ( 5 ) page: 316-321   2015

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 22 ( 4 ) page: 2390-2397   2015

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 22 ( 5 ) page: 2565-2571   2015

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  52. 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進展過程の過渡帯電特性 Reviewed

    中野裕介,小島寛樹,土屋賢治,早川直樹

    電気学会論文誌A   Vol. 134 ( 11 ) page: 578-584   2014

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

  53. Influence of longitudinal temperature distribution on current limiting function of Superconducting Fault Current Limiting Cable (SFCLC) Reviewed

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

    Journal of Physics: Conference Series (JPCS)   Vol. 507   page: 032026   2014

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  54. A Novel Electrical Insulating Material for 275 kV High-Voltage HTS Cable with Low Dielectric Loss Reviewed

    N.Hayakawa, S.Nishimachi, O.Maruyama, T.Ohkuma, J.Liu, M.Yagi

    Journal of Physics: Conference Series (JPCS)   Vol. 507   page: 032021   2014

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  55. Pre-discharge and Flashover Characteristics of Impulse Surface Discharge in Vacuum Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 21 ( 1 ) page: 403-410   2014

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 21 ( 1 ) page: 88-95   2014

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 20 ( 2 ) page: 454-461   2013

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

  58. Status of 275 kV Class REBCO Superconducting Cable Development Reviewed

    S.Mukoyama, M.Yagi, T.Mitsuhashi, T.Nomura, J.Ten, R.Nakayama, T.Ohkuma, O.Maruyama, Y.Aoki, T.Saitoh, N.Amemiya, A.Ishiyama, N.Hayakawa

    IEEE Trans. on Applied Superconductivity   Vol. 23 ( 3 ) page: 5402804   2013

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

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

    IEEE Trans. on Applied Superconductivity   Vol. 23 ( 3 ) page: 5600504   2013

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  60. Development of 66 kV and 275 kV Class REBCO HTS Power Cables Reviewed

    O.Maruyama, T.Ohkuma, T.Masuda, Y.Ashibe, S.Mukoyama, M.Yagi, T.Saitoh, T.Hasegawa, N.Amemiya, A.Ishiyama, N.Hayakawa

    IEEE Trans. on Applied Superconductivity   Vol. 23 ( 3 ) page: 5401405   2013

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  61. 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 Reviewed

    小島寛樹,鈴木隆文,早川直樹,花井正広,大久保仁

    電気学会論文誌B   Vol. 133 ( 1 ) page: 114-120   2013

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  62. Integration of Asset Management and Smart Grid with Intelligent Grid Management System Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 20 ( 6 ) page: 2195-2202   2013

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  63. Charge behavior in Palm Fatty Acid Ester Oil (PFAE) / pressboard composite insulation system under voltage application Reviewed

    H.Kojima. N.Hayakawa, H.Okubo, K.Kato, K.Kawanishi, H.Koide

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 19 ( 2 ) page: 419-423   2012

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  64. Estimation of Partial Discharge Inception Voltage of Magnet Wire under Inverter Surge Voltage by Volume-Time Theory Reviewed

    N.Hayakawa, F.Shimizu, H.Okubo

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 19 ( 2 ) page: 550-557   2012

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  65. Feasibility Study on High Temperature Superconducting Fault Current Limiting Cable (SFCLC) Using Flux Flow Resistance Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 22 ( 2 ) page: 4800105   2012

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  66. Current limitation and recovery function for superconducting fault current limiting transformer (SFCLT) Reviewed

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

    Physics Procedeia   Vol. 36   page: 841-844   2012

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  67. Superconducting Fault Current Limiting Cable (SFCLC) with Current Limiting and Recovery Function Reviewed

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

    Physics Procedeia   Vol. 36   page: 1296-1300   2012

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  68. Recent Progress in Electrical Insulation Techniques for HTS Power Apparatus Reviewed

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

    Physics Procedeia   Vol. 36   page: 1305-1308   2012

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  69. 周波数応答解析によるモータサージ電圧の推定と抑制 Reviewed

    脇本亨,高橋芳光,木村統公,鳴海礼斗史,早川直樹

    電気学会論文誌A   Vol. 132 ( 8 ) page: 630-637   2012

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  70. Model Cable Tests for a 275 kV 3 kA HTS Power Cable Reviewed

    S.Mukoyama, M.Yagi, T.Yonemura, T.Nomura, N.Fujiwara, Y.Ichikawa, Y.Aoki, T.Saitoh, N.Amemiya, A.Ishiyama, N.Hayakawa

    IEEE Trans. on Applied Superconductivity   Vol. 21 ( 3 ) page: 976-979   2011

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

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

    IEEE Trans. on Applied Superconductivity   Vol. 21 ( 3 ) page: 1422-1425   2011

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

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

    IEEE Trans. on Applied Superconductivity   Vol. 21 ( 3 ) page: 1401-1404   2011

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  73. Development Process of Impulse Surface Flashover on Alumina Dielectrics in Vacuum Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 18 ( 3 ) page: 918-923   2011

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 18 ( 2 ) page: 425-431   2011

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  75. Progress in Development of Superconducting Fault Current Limiting Transformer (SFCLT) Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 21 ( 3 ) page: 1397-1400   2011

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  76. 湿度の影響を考慮した気中不平等ギャップにおける部分放電開始計算モデルの開発 Reviewed

    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

    電気学会論文誌A   Vol. 131 ( 12 ) page: 1017-1023   2011

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 18 ( 6 ) page: 2108-2114   2011

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  78. 部分放電の時系列測定によるGIS内部の欠陥状態識別 Reviewed

    吉田昌展,鈴木啓介,小島寛樹,早川直樹,花井正広,大久保仁

    電気学会論文誌B   Vol. 131 ( 11 ) page: 905-911   2011

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

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

    Journal of Physics: Conference Series (JPCS)   Vol. 234 ( 032020 )   2010

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

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 17 ( 1 ) page: 247-255   2010

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  81. Dielectric Properties of Epoxy/Alumina Nanocomposite Influenced by Agglomerates Control Reviewed

    M.Kurimoto, H.Okubo, K.Kato, M.Hanai, Y.Hoshina, M.Takei, N.Hayakawa

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 17 ( 3 ) page: 1268-1275   2010

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  82. Partial Discharge and Associated Mechanisms for Micro Gap Delamination at Epoxy Spacer in GIS Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 17 ( 3 ) page: 861-867   2010

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  83. Permittivity Characteristics of Epoxy/Alumina Nanocomposite with High Particle Dispersibility by Combining Ultrasonic Wave and Centrifugal Force Reviewed

    M.Kurimoto, H.Okubo, K.Kato, M.Hanai, Y.Hoshina, M.Takei, N.Hayakawa

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 17 ( 4 ) page: 1268-1275   2010

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

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

    Journal of Physics: Conference Series (JPCS)   Vol. 234 ( 032070 ) page: -   2010

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  85. Surface Charge Accumulation and Partial Discharge Activity for Small Gaps of Electrode/Epoxy Interface in SF6 Gas Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 16 ( 4 ) page: 1150-1157   2009

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  86. Dynamic Thermal Characteristics of HTS Coil for Conduction-cooled SMES Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 19 ( 3 ) page: 2036-2039   2009

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  87. Current Limiting Characteristics of Parallel-Connected YBCO Coated Conductors for High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT) Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 19 ( 3 ) page: 1880-1883   2009

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  88. *Time Variation of Partial Discharge Activity Leading to Breakdown of Magnet Wire under Repetitive Surge Voltage Application Reviewed

    N.Hayakawa, H.Inano, Y.Nakamura, H.Okubo

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 15 ( 6 ) page: 1701-1706   2008

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  89. *Partial Discharge Activity in Electrical Insulation for High Temperature Superconducting (HTS) Cables Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 15 ( 3 ) page: 647-654   2008

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

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

    Journal of Physics: Conference Series     page: 12154   2008

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  91. *Quench-induced Partial Discharge Characteristics of HTS Cables Reviewed

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

    Journal of Physics: Conference Series     page: 12053   2008

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  92. High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT) with 2G Coated Conductors Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 17 ( 2 ) page: 1768-1771   2007

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  93. Electrical Insulation Characteristics of HTS Cables under Quench-induced Thermal Stress Condition Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 17 ( 2 ) page: 1660-1663   2007

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  94. Thermal Runaway Characteristics of Bi2212 Coil for Conduction-cooled SMES Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 17 ( 2 ) page: 1959-1962   2007

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  95. *Breakdown Characteristics of N2O Gas Mixtures for Quasiuniform Electric Field under Lightning Impulse Voltage Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 14 ( 6 ) page: 1492-1497   2007

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  96. Technical Development on Partial Discharge Measurement and Electrical Insulation Techniques for Low Voltage Motors Driven by Voltage Inverters Reviewed

    H.Okubo, N.Hayakawa, G.C.Montanari

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 14 ( 6 ) page: 1516-1530   2007

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  97. Partial Discharge Inception and Propagation Characteristics of Magnet Wire for Inverter-Fed Motor under Surge Voltage Condition Reviewed

    N.Hayakawa, M.Morikawa, H.Okubo

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 14 ( 1 ) page: 39-45   2007

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  98. N2O混合ガスの絶縁特性におけるシナジズム効果 Reviewed

    早川直樹,木下修,小島寛樹,遠藤奎将,吉田昌展,小川達也,大久保仁

    電気学会論文誌B   Vol. 126 ( 11 ) page: 1164-1170   2006

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  99. Streamer and Leader Discharge Propagation Characteristics Leading to Breakdown in Electronegative Gases Reviewed

    N.Hayakawa, K.Hatta, S.Okabe, H.Okubo

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 113 ( 4 ) page: 842-849   2006

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  100. Impulse and ac Partial Discharge Inception and Breakdown Characteristics of LN2/Polypropylene Laminated Paper Composite Insulation System Reviewed

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

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 113 ( 3 ) page: 664-669   2006

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  101. Common Insulating Properties in Insulating Materials Reviewed

    S.Okabe, N.Hayakawa, H.Murase, H.Hama, H.Okubo

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 113 ( 2 ) page: 327-335   2006

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

    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

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

    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

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  104. Impulse Partial Discharge Characteristics and Their Mechanisms under Non-uniform Electric Field in N2/SF6 Gas Mixtures Reviewed

    N.Hayakawa, Y.Yoshitake, N.Koshino, T.Ueda, H.Okubo

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 12 ( 5 ) page: 1035-1042   2005

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  105. A Novel Technique for Partial Discharge and Breakdown Investigation Based on Current Pulse Waveform Analysis Reviewed

    H.Okubo, N.Hayakawa

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 12 ( 4 ) page: 736-744   2005

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  106. Temperature Dependence of Critical Current at 4.2K–55K of Conduction-cooled Bi2212/Ag Wires Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 15 ( 2 ) page: 2550-2553   2005

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  107. High voltage requirements and test of a 10 MVA superconducting fault current limiter Reviewed

    M.Noe, K.-P.Juengst, S.Elschner, J.Bock, F.Breuer, R.Kreutz, M.Kleimaier, K.-H.Weck, N. Hayakawa

    IEEE Trans. on Applied Superconductivity   Vol. 15 ( 2 ) page: 2082-2085   2005

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  108. Recovery Characteristics after Current Limitation of High Temperature Superconducting Fault Current Limiting Transformer (HTc-SFCLT) Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 15 ( 2 ) page: 1859-1862   2005

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  109. Dielectric Characteristics of HTS Cables Based on Partial Discharge Measurement Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 15 ( 2 ) page: 1802-1805   2005

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  110. CO2ガスのインパルス比と初期電子発生特性 Reviewed

    越野尚人,木下修,早川直樹,五島久司,岡部成光,森井浩,大久保仁

    電気学会論文誌B   Vol. 125 ( 6 ) page: 568-574   2005

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  111. Partial Discharge Inception Characteristics of LN2/PP Laminated Paper Composite Insulation System for High Temperature Superconducting Cable Reviewed

    N.Hayakawa, T.Kobayashi, M.Hazeyama, T.Takahashi, K.Yasuda, H.Okubo

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 12 ( 1 ) page: 166-174   2005

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  112. Partial discharge characteristics of inverter-fed motor coil samples under ac and surge voltage conditions Reviewed

    N.Hayakawa, H.Okubo

    IEEE Electrical Insulation Magazine   Vol. 21 ( 1 ) page: 5-10   2005

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  113. Electrical Insulation Characteristics at Cryogenic Temperature for High Temperature Superconducting Cables Reviewed

    H.Okubo, N.Hayakawa

    KIEE International Transactions on Electrophysics and Applications   Vol. 4-C ( 1 ) page: 15-20   2004

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  114. 高温超電導限流変圧器(HTc-SFCLT)の開発 Reviewed

    クルパコン チャチャヴァン,早川直樹,鹿島直二,長屋重夫,大久保仁

    電気学会論文誌B   Vol. 124 ( 10 ) page: 1193-1199   2004

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  115. Development of High Temperature Superconducting Fault Current Limiting Transformer (HTc-SFCLT) with Bi2212 Bulk Coil Reviewed

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

    IEEE Trans. on Applied Superconductivity   Vol. 14 ( 2 ) page: 900-903   2004

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  116. 棒-平板電極における空気および窒素ガス中インパルス部分放電および絶縁破壊特性 Reviewed

    斉藤 仁,森田啓一,吉川隆司,早川直樹,大久保仁

    電気学会論文誌B   Vol. 123 ( 2 ) page: 169-174   2003

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  117. Electrical Insulation Performance under Thermal and Electric Combined Stress for Resistive Superconducting Fault Current Limiters Reviewed

    N.Hayakawa, M.Noe, K.-P.Juengst, H.Okubo

    IEEE Trans. on Applied Superconductivity   Vol. 13 ( 2 ) page: 1996-1999   2003

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  118. V-t characteristics for Partial Discharge Inception of High Temperature Superconducting Power Transmission Cables Reviewed

    M.Hazeyama, N.Hayakawa, K.Matsuo, T.Masuda, H.Okubo

    Physica C   Vol. 372-376 ( 3 ) page: 1551-1554   2002

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  119. V-t Characteristics of Partial Discharge Inception in Liquid Nitrogen/PPLP Composite Insulation System for HTS Superconducting Cable Reviewed

    H.Okubo, M.Hazeyama, N.Hayakawa, S.Honjo, T.Masuda

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 9 ( 6 ) page: 945-951   2002

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  120. Impulse Partial Discharge and Breakdown Characteristics of Rod-Plane Gaps in N2/SF6 Gas Mixtures Reviewed

    H.Saitoh, K.Morita, T.Kikkawa, N.Hayakawa, H.Okubo

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 9 ( 4 ) page: 544-550   2002

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  121. Partial discharge and breakdown mechanisms in ultra-dilute SF6 and PFC gases mixed with N2 gas Reviewed

    H.Okubo, T.Yamada, K.Hatta, N.Hayakawa, S.Yuasa, S.Okabe

    Journal of Physics D: Applied Physics   Vol. 35 ( 21 ) page: 2760-2765   2002

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  122. Investigation of Electric Insulation Diagnosis of Solid Insulators in GIS by Partial Discharge Current Pulse Waveform Analysis (PD-CPWA) Reviewed

    H.Okubo, A.Matsushita, S.Watanabe, N.Hayakawa, T.Kumai

    IEEE PES T&D   Vol. 2   page: 925-930   2002

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  123. Development of Superconducting Fault Current Limiting Transformer (SFCLT) with the Functions of Fault Current Suppression and System Stability Improvement Reviewed

    H.Okubo, H.Kagawa, N.Hayakawa, N.Kashima, S.Nagaya

    IEEE PES T&D   Vol. 1   page: 301-306   2002

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

  124. Experimental Study on Superconducting Fault Current Limiting Transformer (SFCLT) for Fault Current Suppression and System Stability Improvement Reviewed

    H.Kagawa, N.Hayakawa, N.Kashima, S.Nagaya, H.Okubo

    Physica C   Vol. 372-376 ( 3 ) page: 1706-1710   2002

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

  125. Partial Discharge Inception Characteristics under Butt Gap Condition in Liquid Nitrogen/PPLP Composite Insulation System for High Temperature Superconducting Cable Reviewed

    M.Hazeyama, T.Kobayashi, N.Hayakawa, S.Honjo, T.Masuda, H.Okubo

    IEEE Trans. on Dielectrics and Electrical Insulation   Vol. 9 ( 6 ) page: 939-944   2002

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

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Books 10

  1. Superconducting Fault Current Limiter

    Pascal Tixador et al.( Role: Joint author)

    World Scientific Publishing  2018.12 

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    Language:English Book type:Scholarly book

  2. Tailoring of Nanocomposite Dielectrics: from Fundamentals to Devices and Applications

    T.Tanaka, A.S.Vaughan et al.( Role: Joint author)

    Pan Stanford Publishing  2016.10 

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    Language:English Book type:Scholarly book

  3. 環境調和型社会のためのエネルギー科学

    長﨑正雅,早川直樹,他( Role: Joint author)

    (社)コロナ社  2016.1 

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    Language:Japanese

  4. ナノテク材料~ポリマーナノコンポジット絶縁材料の世界~

    田中祀捷,早川直樹,他( Role: Joint author)

    (社)オーム社  2014.8 

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    Language:Japanese

  5. 電気工学ハンドブック(第7版)

    大久保仁,早川直樹,他( Role: Joint author)

    (社)電気学会  2013.9 

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    Language:Japanese

  6. 超伝導現象と高温超伝導体

    内藤方夫,早川直樹,他( Role: Joint author)

    エヌ・ティー・エス  2013.3 

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    Language:Japanese

  7. 高分子絶縁材料技術とその実例・評価

    大木義路,早川直樹,他( Role: Joint author)

    サイエンス&テクノロジー  2010.3 

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    Language:Japanese

  8. 電力システム工学

    大久保仁,一柳勝宏,水野幸男,早川直樹,後藤泰之,松村年郎,鵜飼裕之,滝川浩史( Role: Joint author)

    オーム社  2008.12 

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    Language:Japanese

  9. High Temperature Superconductivity 1

    ( Role: Joint author)

    Springer-Verlag  2004.1 

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    Language:English

  10. 電力システム工学

    大久保仁,中村光一,早川直樹,後藤泰之,内藤克彦,榊原建樹,松村年郎,田原徳夫( Role: Joint author)

    オーム社  1998.1 

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    Language:Japanese

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Presentations 7

  1. High-Temperature Superconducting (HTS) Transformer Experience and Applications International conference

    Naoki Hayakawa

    International Council on Large Electric Systems 

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    Event date: 2014.8

    Language:English   Presentation type:Oral presentation (keynote)  

    Country:France  

  2. Cryogenic Electrical Insulation - Common Techniques for Superconducting Power Application International conference

    Naoki Hayakawa

    International Conference on Applied Superconductivity and Electromagnetic Devices 

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    Event date: 2015.11

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

    Country:China  

  3. Development of Superconducting Fault Current Limiting Transformer (SFCLT)

    International Workshop on HTS Power Applications 

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    Event date: 2007.11

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

    Country:Japan  

  4. Partial Discharge Measurement and Characteristics in Cryogenic Electrical Insulation for HTS Power Apparatus International conference

    Cryogenic Dielectrics Workshop 

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    Event date: 2005.10

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

  5. Superconducting Fault Current Limiting Transformer (SFCLT) Project

    International Workshop on HTS Power Applications 

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    Event date: 2005.8

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

    Country:Japan  

  6. Quench-induced Dynamic Breakdown Characteristics of Superconducting Power Apparatus International conference

    Workshop for Low Temperature High Voltage Problems in Electric Power Engineering 

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    Event date: 2004.3

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

  7. Partial Discharge Inception Characteristics of LN2/Polypropylene Laminated Paper Composite Insulation System for High Temperature Superconducting Cables International conference

    Workshop for Low Temperature High Voltage Problems in Electric Power Engineering 

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    Event date: 2004.3

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

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Research Project for Joint Research, Competitive Funding, etc. 12

  1. 革新的機能性絶縁材料の先導研究

    2015.2 - 2016.2

    エネルギー・環境新技術先導プログラム 

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    Grant type:Competitive

  2. 「高電圧機器関連」領域の長期的研究課題に関する調査研究

    2008.10 - 2009.3

  3. イットリウム系超電導コイルの絶縁特性評価に関する研究

    2008.4 - 2009.3

    国内共同研究 

  4. インバータ駆動電動機の部分放電測定技術

    2008.4 - 2009.3

    企業からの受託研究 

  5. 環境調和型エネルギー輸送技術としての超電導送電に関する研究

    2007.4 - 2008.3

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    Grant type:Competitive

  6. HV/EV用インバータ駆動モータのサージ絶縁性能に及ぼす環境要因の影響に関する研究

    2007.4 - 2008.3

    国内共同研究 

  7. インバータ駆動電動機の部分放電測定技術

    2007.4 - 2008.3

    企業からの受託研究 

  8. 極低温電気絶縁に関する調査研究

    2006.9 - 2007.3

    企業からの受託研究 

  9. 極低温電気絶縁に関する調査研究

    2005.9 - 2006.3

    企業からの受託研究 

  10. 次世代ガス絶縁機器に適用する絶縁ガスの特性に関する研究

    2005.4 - 2006.3

    国内共同研究 

  11. 超電導限流変圧器の導入効果に関する調査研究

    2004.4 - 2005.3

    企業からの受託研究 

  12. 環境低負荷型ガスの基礎特性解明および次世代ガス絶縁機器適用に関する研究

    2004.4 - 2005.3

    国内共同研究 

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KAKENHI (Grants-in-Aid for Scientific Research) 7

  1. Innovative electric field control by functionally graded materials of conductivity in dc gas insulated electric apparatus

    Grant number:18H01423  2018.4 - 2021.3

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    Authorship:Coinvestigator(s) 

  2. 超伝導限流器の実用化に向けた高信頼度化と合理的設計・運用に関する研究

    2017.4 - 2020.3

    科学研究費補助金  基盤研究(B)

    早川 直樹

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    Authorship:Principal investigator 

  3. Reliable and Rational Design and Operation of Superconducting Fault Current Limiters for Practical Use

    Grant number:17H03215  2017.4 - 2020.3

    Hayakawa Naoki

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    Authorship:Principal investigator 

    Grant amount:\18330000 ( Direct Cost: \14100000 、 Indirect Cost:\4230000 )

    This research investigates the application techniques of superconductivity with zero resistance toward a future electric power transmission system with low cost and low possibility of blackout. In particular, superconducting fault current limiters (SFCL) are expected to be developed and actually introduced in order to protect the system from blackout due to lightning and so on. Then, electrical characteristics of liquid nitrogen to maintain SFCL in superconducting state have been elucidated, and the highly reliable and rational design method of SFCL has been proposed. In addition, the effective introduction and operation methods of SFCL in the system have been proposed.

  4. 高温超伝導ケーブルの合理的絶縁設計・試験技術に関する研究

    2009 - 2012.3

    科学研究費補助金  基盤研究(B),課題番号:21360128

    早川 直樹

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    Authorship:Principal investigator 

  5. 高温超伝導ケーブルの動的複合ストレス環境を考慮した高信頼度化に関する研究

    2006.4 - 2008.3

    科学研究費補助金  基盤研究(B),課題番号:18360135

    早川 直樹

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    Authorship:Principal investigator 

  6. 伝導冷却高温超伝導線材のクエンチ/熱暴走検出・保護技術に関する研究

    2004.4 - 2006.3

    科学研究費補助金  基盤研究(B),課題番号:16360138

    早川 直樹

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    Authorship:Principal investigator 

  7. 高温超伝導バルク導体を用いた超伝導限流変圧器の開発に関する研究

    2002.4 - 2004.3

    科学研究費補助金  基盤研究(A),課題番号:14205040

    早川 直樹

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    Authorship:Principal investigator 

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Teaching Experience (On-campus) 30

  1. 高電圧工学

    2016

  2. 電磁理論

    2016

  3. 電気エネルギー伝送工学

    2016

  4. 高電圧工学

    2015

  5. 電磁理論

    2015

  6. 電気エネルギー伝送工学

    2015

  7. 超伝導応用工学特論

    2015

  8. Electric Power and Energy

    2015

  9. First Year Seminar A

    2015

  10. 電気エネルギー伝送工学

    2014

  11. 電磁理論

    2014

  12. 高電圧工学

    2014

  13. First Year Seminar A

    2013

  14. 超伝導応用工学特論

    2013

  15. 電気エネルギー伝送工学

    2013

  16. 線形回路論

    2013

  17. 電磁理論

    2013

  18. 線形回路論

    2012

  19. 電気エネルギー伝送工学

    2012

  20. 電磁理論

    2012

  21. First Year Seminar A

    2011

  22. 超伝導応用工学特論

    2011

  23. 線形回路論

    2011

  24. 電気エネルギー伝送工学

    2011

  25. 電磁理論

    2011

  26. 電気エネルギー伝送工学

    2010

  27. 電磁理論

    2010

  28. 電気エネルギー変換工学

    2009

  29. 基礎セミナーA

    2009

  30. 電磁理論

    2009

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Teaching Experience (Off-campus) 2

  1. 送配電工学

    1998.4 - 1999.3 豊田工業高等専門学校)

  2. 送配電工学

    1997.4 - 1998.3 豊田工業高等専門学校)