Analysis on an Insulation Breakdown Accident of 500 kV GIS Disconnector

WANG Jing-jun; HUANG Yu-long

doi:10.13296/j.1001-1609.hva.2013.09.020

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Analysis on an Insulation Breakdown Accident of 500 kV GIS Disconnector

更新时间：2025-04-26

- Analysis on an Insulation Breakdown Accident of 500 kV GIS Disconnector
- High VoltageApparatus Vol. 49, Issue 9, Pages: 119-123(2013)
- 作者机构：
  
  1. 江苏省电力公司电力科学研究院
  2. 清华大学电机工程与应用电子技术系
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2013.09.020
  CLC： TM564.1
- Published：2013
- 稿件说明：
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[1]王静君,黄瑜珑.一起500kV GIS隔离开关绝缘闪络的事故分析[J].高压电器,2013,49(09):119-123.

WANG Jing-jun, HUANG Yu-long. Analysis on an Insulation Breakdown Accident of 500 kV GIS Disconnector[J]. High voltageapparatus, 2013, 49(9): 119-123.
[1]王静君,黄瑜珑.一起500kV GIS隔离开关绝缘闪络的事故分析[J].高压电器,2013,49(09):119-123. DOI： 10.13296/j.1001-1609.hva.2013.09.020.

WANG Jing-jun, HUANG Yu-long. Analysis on an Insulation Breakdown Accident of 500 kV GIS Disconnector[J]. High voltageapparatus, 2013, 49(9): 119-123. DOI： 10.13296/j.1001-1609.hva.2013.09.020.

摘要

介绍了一起500 kV GIS隔离开关气室绝缘闪络的事故分析过程。通过对隔离开关故障电流的分析、SF6气体成分的检测以及对故障气室的解体、SF6固体分解产物的电镜扫描

认为隔离开关均压环的装配工艺不良、紧固螺丝没有拧紧至应有的力矩

使得接触电阻增大、螺丝发热通流烧熔

是此次绝缘闪络事故发生的主要原因。通过对这起事故的分析研究

对今后GIS类似故障的处理分析提供借鉴与参考。

Abstract

An accident of insulation breakdown of a 500 kV GIS disconnector is introduced.The fault current and the SF6 content are analyzed

the faulty disconnector is disassembled

and the solid decomposition product is observed by SEM.It is found that the insufficient moment of the screw on the equalizing ring due to poor assembly process increases the contact resistance

which results in heating and melting of the screw to cause the accident.

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