研究者詳細 - 小島　寛樹

講演・口頭発表等 - 小島　寛樹

分割表示 762 件中 521 - 540 件目／全件表示 >>

Enhancement of Breakdown Strength by Microdischarge under Impulse Voltage Applications in Vacuum 国際会議

K. Aoki, R. Nishimura, H. Kojima, M. Homma, T. Shioiri, H. Okubo

24th International Symposium on Discharges and Electrical Insulation in Vacuum 2010年8月30日 HTEE Institute for High-Voltage Technology and Electric Power Systems

開催年月日： 2010年8月 - 2010年9月

記述言語：英語会議種別：ポスター発表

開催地：Braunschweig 国名：ドイツ連邦共和国

An investigation of charge behavior such as microdischarge under high electric field in vacuum is very important in order to enhance the electrical insulation performance of vacuum circuit breakers and vacuum interrupters (VCB/VI). This paper discusses the enhancement characteristics of breakdown strength by microdischarge under applying impulse voltage repeatedly and changing vacuum pressure. As a result, microdischarge which had pulsed current waveform became smaller with repeated constant peak voltage applications under 10-6 Pa vacuum. In addition, microdischarge generation had the electrode conditioning effect to raise the breakdown voltage by reducing adsorption gas of the electrodes. Microdischarge having very small charge compared with that of breakdown has a possibility of drastic enhancement of breakdown strength in vacuum, as the non-breakdown conditioning technique. ©2010 IEEE.

DOI： 10.1109/DEIV.2010.5625863

Scopus

CiNii Research

その他リンク： https://www.webofscience.com/wos/woscc/full-record/WOS:000287378600008

Development Mechanism of Impulse Surface Flashover on Alumina Dielectrics in Vacuum 国際会議

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

24th International Symposium on Discharges and Electrical Insulation in Vacuum 2010年8月30日 HTEE Institute for High-Voltage Technology and Electric Power Systems

開催年月日： 2010年8月 - 2010年9月

記述言語：英語会議種別：ポスター発表

開催地：Braunschweig 国名：ドイツ連邦共和国

We investigated the development mechanism of impulse surface flashover on alumina ceramic insulator in vacuum. We measured the still image and framing image of fast developing surface flashover in synchronous with applied impulse voltage and current waveforms. The light emission transition in initiation of surface flashover was clarified. We found the dark area is formed around the cathode and conducting channel is formed from the anode in developing process of surface flashover in vacuum. ©2010 IEEE.

DOI： 10.1109/DEIV.2010.5625860

Scopus

CiNii Research

その他リンク： https://www.webofscience.com/wos/woscc/full-record/WOS:000287378600023

Current Limiting and Recovery Characteristics of 2MVA Class Superconducting Fault Current Limiting Transformer (SFCLT) 国際会議

2010 Applied Superconductivity Conference

Progress in Development of Superconducting Fault Current Limiting Transformer (SFCLT) 国際会議

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

Applied Superconductivity Conference

Feasibility Study on High Temperature Superconducting Fault Current Limiting Cable (HTS-FCL Cable) Using Flux Flow Resistance 国際会議

F. Kato, H. Kojima, N. Hayakawa, F. Endo, H. Okubo

Applied Superconductivity Conference

Analysis of Current Limiting and Recovery Characteristics of Superconducting Fault Current Limiting Transformer (SFCLT) with YBCO Coated Conductors 国際会議

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

Applied Superconductivity Conference

フラックスフロー抵抗を用いた超電導限流ケーブル (HTS-FCL Cable) の限流特性

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 2010年6月10日電気学会超電導応用電力機器技術委員会

伝導冷却SMESの超電導コイルモデルにおける電気絶縁性能

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

電気学会超電導応用電力機器研究会 2010年6月11日電気学会超電導応用電力機器技術委員会

Optimization of Asset Management in High Voltage Substation Based on Equipment Monitoring and Power System Operation 国際会議

Y. Suzuki, H. Kojima, N. Hayakawa, F. Endo, H. Okubo

2010 IEEE International Symposium on Electrical Insulation 2010年6月9日 IEEE Dielectrics and Electrical Insulation Society

開催年月日： 2010年6月

記述言語：英語会議種別：シンポジウム・ワークショップパネル（公募）

開催地：San Diego 国名：アメリカ合衆国

This paper presents a new optimization approach of maintenance strategy for equipment in a transmission and distribution (T&D) system. In this approach, a present and future equipment performance is estimated by using monitoring data, and impacts of performance in each equipment on a whole T&D system are evaluated. By minimizing the impacts, suitable maintenance procedures and timing are derived. This approach is applied to a circuit breaker (CB) in an electric network, and its significance and usefulness are presented. © 2010 IEEE.

DOI： 10.1109/ELINSL.2010.5549579

Scopus

CiNii Research

その他リンク： https://www.webofscience.com/wos/woscc/full-record/WOS:000287026500039

真空バルブ内電極の電界最適化自動計算における最適収束条件の検討

鈴木啓也，加藤克巳，小島寛樹，大久保仁

平成22年電気学会全国大会