Abstract
In this study, a downsized DC-GIL model is applied to investigate the surface charging and discharging characteristics of the basin-type spacer in 0.1 MPa SF <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</inf> gas. Under a low electric field, the surface charge accumulation is dominated by the bulk conduction of the spacer. As the charging voltage increases, gas ionization occurs in the localized strong electric field around the high voltage electrode, taking over the dominant position. Flashovers typically develop along the convex surface of the spacer, because the homo-charge accumulation induced by brush discharges on the concave surface aggravates the electric field distortion at the convex side. This study aims to help understand how surface charges trigger a flashover on the spacer surface, and to serve as a basis for the design of spacers for DC-GIL.
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