Abstract
AbstractIn this chapter, a downsized DC-GIL model is applied to investigate the surface charging and discharging characteristics of the basin-type spacer in 0.1 MPa SF6 and air. 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, taking over the dominant position. In 0.1 MPa SF6 gas, flashovers typically develop along the convex surface of the spacer under both positive and negative voltages, because the homo-charge accumulation induced by brush discharges on the concave surface aggravates the electric field distortion at the convex side. In air, the DC flashovers have the polarity effect. Under negative voltage, the flashover development is similar to that in SF6 gas. But for positive polarity, the space charge region of positive polarity intensifies the electric field ahead of the corona region, promoting the air gap breakdown at the concave side of the spacer.
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