NDLI: Influence of surface charges on impulse flashover characteristics of alumina dielectrics in vacuum

Content Provider	IEEE Xplore Digital Library
Author	Kato, K. Kato, H. Ishida, T. Okubo, H. Tsuchiya, K.
Copyright Year	1994
Abstract	For higher electrical insulator performance of vacuum circuit breakers (VCB), the surface flashover in vacuum should be improved. In particular, it is important to clarify how strongly surface charges influence the surface flashover mechanism. In this paper, we investigated the surface flashover characteristics based on the existence of surface charges on an alumina insulator in vacuum. We changed the location and magnitude of surface charges and measured surface flashover voltage. From our experimental results, an attempt was made to clarify the influence of charges on alumina dielectrics on impulse surface flashover characteristics in vacuum. From this, we concluded that (1) when surface charges were located near the cathode electrode, a positive charge made the surface flashover voltage lower and a negative charge made the surface flashover voltage higher; and, (2) when surface charges were located in the way of the discharge path, both positive and negative charges made the surface flashover voltage lower. We were able to explain these results by considering the influence of surface charges on the electric field at flashover and on the secondary electron emission avalanche.
Sponsorship	National Natural Science Foundation of China (NSFC) Region Centre Ville de Tours Conseil General D'Indre et Loire ABB IEEE Sandia National Laboratories TOSHIBA
File Size	1140457
File Format	PDF
ISSN	10709878
Volume Number	16
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Flashover Surface discharges Dielectrics and electrical insulation Circuit breakers Current measurement Dielectric measurements Voltage measurement Cathodes Electrodes Fault location Vacuum, surface flashover, surface charge, alumina insulator, electric field, secondary electron emission avalanche
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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