研究者詳細 - 小島　寛樹

1st International Conference on Electric Power Equipment - Switching Technology 2011年10月25日 China Electrotechnical Society and Chinese Society for Electrical Engineering

開催年月日： 2011年10月

記述言語：英語会議種別：口頭発表（一般）

開催地：Xi’an 国名：中華人民共和国

In high voltage vacuum apparatus, e.g. vacuum circuit breaker, a partial discharge phenomenon, which is not breakdown but has a potential to lead breakdown, is observed under AC voltage application. We investigate the partial discharge along an insulator surface in vacuum under AC voltage application by the measurement of the charging and the light emission. Under sudden AC high voltage application, the partial discharge along the alumina surface occurred at the peak voltage of both polarities, but mainly at the negative polarity. The partial discharge was initiated near the rod electrode and spread out over the whole alumina surface. The partial discharge and subsequent charging behavior on the alumina surface under AC voltage application was verified to be dominated by the distortion of electric field due to not only the negative charges on the alumina surface but also the decrease phase of applied AC voltage. © 2011 IEEE.

DOI： 10.1109/ICEPE-ST.2011.6123044

Scopus

Surface Flashover Propagation Process on Alumina Dielectrics under Impulse Voltage Application in Vacuum 国際会議

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

1st International Conference on Electric Power Equipment - Switching Technology 2011年10月26日 China Electrotechnical Society and Chinese Society for Electrical Engineering

開催年月日： 2011年10月

記述言語：英語会議種別：口頭発表（一般）

開催地：Xi’an 国名：中華人民共和国

We investigated the mechanism of surface flashover on alumina dielectrics under impulse voltage application in vacuum in order to enhance the electrical insulation performance of vacuum insulated power equipment. Through electrical and optical simultaneous measurements, we discussed propagation process of the surface flashover on alumina dielectrics in vacuum. We changed the incident angle (θ) of electric lines of force to the alumina surface, i.e. parallel and perpendicular as the main parameter. The different propagation process of the surface flashover was found and discussed by the difference of charging process due to an electron flight distance. © 2011 IEEE.

DOI： 10.1109/ICEPE-ST.2011.6123046

Scopus

Impulse Breakdown Mechanism Based on Discharge Propagation Process under Non-uniform Electric Field in Air 国際会議

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 2011年10月18日 IEEE Dielectrics and Electrical Insulation Society

開催年月日： 2011年10月

記述言語：英語会議種別：ポスター発表

開催地：Cancun 国名：メキシコ合衆国

In this paper, we aim to clarify the discharge mechanism leading to breakdown under non-uniform electric field in air, especially on the propagation process of discharge current channel. The discharge measurement was performed in a needle (φ1 mm)-plane electrode system with gap length g=15-100 mm in 0.1 MPa dry air under applying a positive impulse voltage. We observed discharge current waveform and fast-framing images of light emission with image intensifier controlled by a nanosecond pulse. We found out two types of breakdown mechanisms from streamer initiation to breakdown (BD); secondary streamer progress and leader progress. In addition, we investigated the transition region between both types of BD mechanism, focusing on the case of gap length (g=30 mm). Finally, we found that the secondary streamer propagation would dominae the formation process of the discharge channel and the mechanism leading to BD. Also, we found the criterion of impulse breakdown mechanism in air. © 2011 IEEE.

DOI： 10.1109/CEIDP.2011.6232712

Scopus

その他リンク： https://www.webofscience.com/wos/woscc/full-record/WOS:000399725600128

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 2011年9月29日電気学会電力技術委員会/電力系統技術委員会

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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