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Aerial flashover caused by surface flashover generated from microscopic pores of insulating solid
Author(s) -
Shirai Jotaro,
Shigefuku Akinao,
Murakami Yoshinobu,
Hozumi Naohiro,
Nagao Masayuki,
Natsume Kenji,
Naito Norikazu,
Hatano Kazuhisa,
Kawamura Hirotoshi
Publication year - 2012
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.21221
Subject(s) - arc flash , conductor , materials science , voltage , insulator (electricity) , composite material , electrical engineering , electrical conductor , mechanics , engineering , physics
Abstract This paper studies the possibility of an aerial flashover between a coil conductor and the casing in a rotating machine at voltages below Paschen's voltage even when sufficient insulation distance has been provided. It might be considered that partial surface flashover generated from microscopic pores of a solid insulator generates the aerial flashover. In this study, the flashover voltage was measured using a cable which had simulated microscopic pores to confirm the above reasoning. When a potential gradient existed on the surface of the insulating solid, the flashover voltage decreased from that in the absence of a potential gradient. It also became clear that the aerial flashover probability depends mainly on the energy of the surface flashover rather than the energy of the main aerial flashover. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 178(4): 16–23, 2012; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21221