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Fundamental insulation characteristics of air; N 2 , CO 2 , N 2 /O 2 , and SF 6 /N 2 mixed gases
Author(s) -
Rokunohe Toshiaki,
Yagihashi Yoshitaka,
Endo Fumihiro,
Oomori Takashi
Publication year - 2006
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.20348
Subject(s) - switchgear , dielectric gas , dielectric strength , circuit breaker , greenhouse gas , sulfur hexafluoride , materials science , dielectric , electrical engineering , coating , composite material , engineering , environmental science , chemistry , ecology , organic chemistry , biology
SF 6 gas has excellent dielectric strength and interruption performance. For these reasons, it has been widely used for gas‐insulated switchgear (GIS). However, use of SF 6 gas has become regulated under agreements set at the 1997 COP3. Presently, development of a gas circuit breaker (GCB) using CO 2 gas and development of a high‐voltage vacuum circuit breaker (VCB) are being pursued. GIS consists of disconnectors (DS), earthing switches (ES), and buses (BUS) in addition to GCB. Since the interruption performance is not an important requirement for DS, ES, and BUS, use of a gas with high dielectric strength is better than use of a gas with good interruption performance. Air and N 2 are not greenhouse gases, and their dielectric strengths are higher than those of other SF 6 alternative gases, but only about one‐third of the dielectric strength of SF 6 gas. This paper deals with a suitable insulation gas which has no greenhouse effect as an SF 6 alternative gas. The N 2 /O 2 mixed gas was investigated by changing the ratio of O 2 . Moreover, the effect of an insulation coating was investigated and compared with the dielectric strength of SF 6 /N 2 mixed gas. The dielectric strength of air under the coating condition was equal to that of 10% SF 6 /N 2 mixed gas. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 155(3): 9–17, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20348