Faculty Profiles - KOJIMA Hiroki

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Synergy Effect in Electrical Insulation Characteristics of N₂O Gas Mixtures

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

2006.1.26

N₂OガスおよびN₂O混合ガスの絶縁特性

木下修，小島寛樹，早川直樹，遠藤奎将，吉田昌展，小川達也，大久保仁

2005年放電学会年次大会

固体およびガス中部分放電における部分放電電流パルス波形解析(PD-CPWA)の適用

杉森康啓，小島寛樹，早川直樹，遠藤奎将，大久保仁

2005年放電学会年次大会

高温超電導ケーブルの積層テープ絶縁構成における部分放電開始・進展および絶縁破壊特性

佐原賢吾，小島寛樹，早川直樹，遠藤奎将，大久保仁

2005年放電学会年次大会

Partial Discharge Inception and Breakdown Characteristics of LN₂/Polypropylene Laminated Paper Composite Insulation System for HTS Cables International conference

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

2005 IEEE Conference on Electrical Insulation and Dielectric Phenomena 2005.10 IEEE Dielectrics and Electrical Insulation Society

Event date： 2005.10

Language：English Presentation type：Poster presentation

Venue：Nashville Country：United States

A novel technique for partial discharge (PD) measurement and analysis (PD-CPWA: PD Current Pulse Waveform Analysis) is developed and introduced in this paper. The purpose of PD-CPWA is to elucidate PD mechanisms and physics in electrical insulating materials, focusing on the PD current pulse waveform and its time transition from PD inception to breakdown (BD). In this paper, PD-CPWA was applied to liquid nitrogen / polypropylene laminated paper composite insulation system for high temperature superconducting cables, and PD inception and propagation characteristics were obtained. Experimental results revealed that PD inception at the lower stress would mainly originated from micro gaps between PP laminated paper layers, and then PD activity could be developed also in butt gaps at the higher stress, and finally leading to BD. © 2005 IEEE.

DOI： 10.1109/CEIDP.2005.1560692

Scopus

Other Link： https://www.webofscience.com/wos/woscc/full-record/WOS:000235927000086

CO₂ガスおよびSF₆ガス中における固体絶縁物上金属異物による部分放電特性

杉森康啓，早川直樹，小島寛樹，遠藤奎将，大久保仁

平成17年度電気関係学会東海支部連合大会

高温超電導ケーブルの積層テープ絶縁構成における部分放電進展および絶縁破壊特性

佐原賢吾，小島寛樹，早川直樹，遠藤奎将，大久保仁

平成17年度電気関係学会東海支部連合大会

N₂O/CO₂/O₂混合ガスの準平等電界下における絶縁破壊特性

木下修，小島寛樹，早川直樹，遠藤奎将，吉田昌展，植田俊明，小川達也，大久保仁

平成17年度電気関係学会東海支部連合大会

伝導冷却SMES用Bi2212/Ag HTSコイルにおける熱暴走特性

野口真希，クルパコンチャチャヴァン，小島寛樹，早川直樹，遠藤奎将，平野直樹，長屋重夫，大久保仁

平成17年度電気関係学会東海支部連合大会

Electrical and Thermal Characteristics of Bi2212/Ag HTS Coils for Conduction-cooled SMES International conference

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

7th European Conference on Applied Superconductivity

Optimization Design of High Temperature Superconducting Fault Current Limiting Transformer (HTc-SFCLT) International coauthorship International conference

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

7th European Conference on Applied Superconductivity

Dielectric-coating Effect in CO₂ and SF₆ Gases under Impulse Voltage Application International conference

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

14th International Symposium on High Voltage Engineering

Dielectric Characteristics of N₂O Gas and N₂O/CO₂ Gas Mixtures as SF₆ Substitutes International conference

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

14th International Symposium on High Voltage Engineering

N₂OおよびN₂O/CO₂混合ガスの不平等電界下における部分放電・絶縁破壊特性

木下修，越野尚人，小島寛樹，早川直樹，植田俊明，吉田昌展，大久保仁

平成17年電気学会電力・エネルギー部門大会

過冷却液体窒素中におけるBi2212/CuNi複合バルクコイルの限流特性

チャチャヴァンクルパコン，小島寛樹，早川直樹，鹿島直二，長屋重夫，大久保仁

平成17年電気学会電力・エネルギー部門大会

冷凍機伝導冷却HTSコイルにおける通電特性および熱的特性

野口真希，チャチャヴァンクルパコン，小島寛樹，早川直樹，平野直樹，長屋重夫，大久保仁

平成17年電気学会電力・エネルギー部門大会

高温超電導ケーブルの積層テープ絶縁構成における部分放電開始・進展特性

梛野晶樹，佐原賢吾，小島寛樹，早川直樹，大久保仁

平成17年電気学会電力・エネルギー部門大会

Technical Feasibility of Superconducting Fault Current Limiting Transformer in Future Electric Power Network

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

International Symposium on EcoTopia Science 2005

Impulse and AC PD Inception Characteristics of LN₂/Polypropylene Laminated Paper Composite Insulation System International conference

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

2005 IEEE International Conference on Dielectric Liquids 2005.6 Laboratório de Instrumentação e Física Experimental de Partículas

Event date： 2005.6 - 2005.7

Language：English Presentation type：Oral presentation (general)

Venue：Coimbra Country：Portugal

We discussed partial discharge (PD) inception characteristics of liquid nitrogen (LN2) / polypropylene (PP) laminated paper composite insulation system for high temperature superconducting (HTS) cables. In this paper, we measured PD inception characteristics under lightning impulse voltage application by both electrical and optical methods. The impulse PD inception characteristics were compared with those under ac voltage application, and the PD generation mechanisms were discussed. Experimental results revealed that PD detection sensitivity under lightning impulse voltage application reached as small as 6 pC. PD was verified to be generated not only inside the butt gap but also outside the butt gap under both lightning impulse and ac voltage applications. AE sensors could also be applied to PD measurement under ac voltage application. © 2005 IEEE.

DOI： 10.1109/ICDL.2005.1490117

Scopus

Other Link： https://www.webofscience.com/wos/woscc/full-record/WOS:000232829800103

Simulation of Current Limiting and Recovery Characteristics of High Temperature Superconducting Fault Current Limiting Transformer (HTc-SFCLT)

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

2005.6.16

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