Abstract
In this paper, the mechanisms of surface charging and surface modification of epoxy spacer affecting the lifting voltage of spherical metal particles in a down-sized DC GIS are investigated by simulations and experiments. Results show that Pre-stressing leads to a 27% decrease of lifting voltage, which is traceable to that surface charging make a major contribution to the enhancement of electric field force. The lifting voltage of metal particles around the epoxy spacer are markedly increased by fluorination, which is a promising treatment for DC GIS application. The lifting behavior of metal particle is significantly inhibited after treatment because of less surface charge accumulation and more rationalized electric field distribution. Direct fluorination is proved as an effective modification method to improve the insulation performance of epoxy spacer again.
Published Version
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