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This is a In Vitro Study study.

August 17, 2025Open Access

Study on metal particle adhesion and discharge characteristics on GIS insulator under power frequency voltage

Key Points

Partial discharge events are more frequent near high-voltage regions, compromising GIS operational stability.
The highest insulation risk is determined at a normalized distance of 0.9, highlighting critical areas for monitoring.
Modeling of metal particle motion provides insights into adhesion behavior and potential failures in GIS insulators.
This analysis emphasizes the need for enhanced design considerations in GIS to mitigate insulation risks and improve reliability.

Abstract

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.

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