Abstract
AbstractIn recent years, compact gas‐insulated switchgear (GIS) has been developed by rationalization of specifications. All of the GIS have been checked for passage of the AC and lightning impulse (LI) withstand test, but DC stress that occurs on an AC GIS spacer when switching devices are operated has not been sufficiently investigated. Since the electrical field strength inside a GIS tank is stronger in compact GIS, it is increasingly necessary to evaluate the withstand performance of GIS spacers under residual DC voltage. Under DC stress, electrification strengthens the electrical field strength at the creepage surface (Et) and the withstand performance of GIS spacers depends on the maximum value of Et (Etmax). When the volume resistivity at the surface layer of spacer is uneven, Et strengthens at the uneven spots. In this paper, Etmax under DC stress with uneven volume resistivity at the surface layer of the spacer is investigated, and an evaluation test method for withstand performance under residual DC charge is constructed. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 179(1): 21–28, 2012; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.21233
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