研究者詳細 - 小島　寛樹

講演・口頭発表等 - 小島　寛樹

分割表示 795 件中 501 - 520 件目／全件表示 >>

Identification of Insulation Defect by Sequential Measurement of Partial Discharge in GIS 国際会議

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

17th International Symposium on High Voltage Engineering

Charge Behavior in Palm Fatty Acid Ester Oil (PFAE) / Pressboard Composite Insulation System with Charged Oil Flow 国際会議

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

2011 IEEE International Conference on Dielectric Liquids 2011年6月27日 SINTEF Energy Research, Norwegian University of Science and Technology

開催年月日： 2011年6月

記述言語：英語会議種別：ポスター発表

開催地：Trondheim 国名：ノルウェー王国

Palm Fatty Acid Ester Oil (PFAE) is expected as one of the substitutes for mineral oil of transformers owing to not only the high biodegradation but also the good insulation performance. In this paper, the electric field strength and its time transition in PFAE/Pressboard composite insulation system-under charged oil flow were directly measured by using Kerr electro-optic technique. We found that the electric field was generated by space charges in PFAE and was temporally changed with charge behavior. By comparison with high charging mineral oil, we clarified that the feature of the charge behavior in PFAE was similar to that in the mineral oil, but the behavior of electric field was different due to the variation of electric properties such as permittivity, relaxing time and charge density. © 2011 IEEE.

DOI： 10.1109/ICDL.2011.6015445

Scopus

その他リンク： https://www.webofscience.com/wos/woscc/full-record/WOS:000295317700045

Discharge Mechanism at HVDC Polarity Reversal in Oil/Pressboard Composite Insulation System 国際会議

H. Kojima, H. Saito, N. Hayakawa, K. Kato, H. Okubo

2011 IEEE International Conference on Dielectric Liquids 2011年6月28日 SINTEF Energy Research, Norwegian University of Science and Technology

開催年月日： 2011年6月

記述言語：英語会議種別：口頭発表（一般）

開催地：Trondheim 国名：ノルウェー王国

At the instant of polarity reversal of HVDC, very high electric field was generated in oil because the applied electric field was superimposed by the electric field of accumulated charges on pressboard (PB). When the total electric field exceeded the breakdown electric field strength, breakdown discharge in oil gap and surface discharge on the PB occurred. In this paper, by electric field measurement using Kerr electro-optic technique and optical observation, breakdown discharge characteristics and mechanisms in oil / PB composite insulation system were investigated at polarity reversal voltage. We revealed that the surface discharge neutralizes the accumulated charges on PB. The above experiments were carried out for different PB arrangements and discussed the discharge characteristics under HVDC polarity reversal conditions were discussed. © 2011 IEEE.

DOI： 10.1109/ICDL.2011.6015443

Scopus

その他リンク： https://www.webofscience.com/wos/woscc/full-record/WOS:000295317700043

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 2011年6月10日電気学会超電導応用電力機器技術委員会