500kV GIS隔离开关绝缘拉杆放电故障原因分析

Cause Analysis on 500 kV GIS Switchgear Insulation Pulling Lever Fault

介绍神华河北国华沧东发电有限责任公司500 kV变电站系统组合电器绝缘拉杆短路放电状况,根据对故障隔离开关的现场解体检查结果,分析故障原因为:组装时的碰撞与挤压使尖角部位起层,带电后局部放电生成的分解物使内壁绝缘不断下降,最终导致接地短路放电。

This article introduces the insulation pole discharge of Cangdong Power Plant 500 kV GIS and analyzes the fail ure,according to the disassembly result of the malfunction disconnector. The causes are layers on the sharp corner were formed by collision during assembly which caused disintegrant from partial discharge that result in declining insulation of the insulation pole inner-side.