Abstract Gas Insulated Switchgear (GIS) is widely used in high-voltage transmission for its compact size and reliability. However, higher grid voltages and capacities have increased internal GIS faults, threatening operational stability. This study models GIS insulator surface defects using equivalent metal particles and analyzes partial discharge (PD) voltage distribution via the pulse current method. Results show PD occurs more readily near high-voltage regions and accelerates with higher voltages. By simulating metal particle motion in AC GIS, the landing probability on insulators is determined. Combining particle landing points with surface PD inception voltage, the highest insulation risk occurs at a normalized distance of 0.9.
Xin et al. (Fri,) studied this question.
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