著者

六戸 敏昭 八木橋 義豊 遠藤 奎将 青柳 健二 斉藤 仁 大森 荘司

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. B, 電力・エネルギー部門誌 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society (ISSN:03854213)

巻号頁・発行日

vol.125, no.12, pp.1270-1277, 2005-12-01

参考文献数

15

被引用文献数

13 7

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SF₆ gas has excellent dielectric strength and interruption performance. For these reasons, it has been widely used for gas insulated switchgear (GIS). However, use of SF₆ gas has become regulated under agreements set at the 1997 COP3. So investigation and development for GIS with a lower amount of SF₆ gas are being carried out worldwide. Presently, SF₆ gas-free GIS has been commercialized for the 24kV class. Air or N₂ gas is used as insulation gas for this GIS. On the other hand, SF₆ gas-free GIS has not been commercialized for 72kV class GIS. Dielectric strengths of air and N₂ gas are approximately 1/3 that of SF₆ gas. So to enhance insulation performance of air and N₂, we have investigated a hybrid gas insulation system which has the combined features of providing an insulation coating and suitable insulation gas. We have developed the world's first 72kV SF₆ gas-free GIS.<br>This paper deals with key technologies for SF₆ gas-free GIS such as the hybrid insulation structure, bellows for the high pressure vacuum circuit breaker, a newly designed disconnector and spacer and prevention of particle levitation. Test results of 72kV high pressure air-insulated GIS with the vacuum circuit breaker are described.