Analysis of a Short Circuit Fault in a 220 kV Gas Insulated Switchgear

YU Hua-ran; JIANG Wei-yi; XU Rong

doi:10.13296/j.1001-1609.hva.2013.08.020

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Analysis of a Short Circuit Fault in a 220 kV Gas Insulated Switchgear

更新时间：2025-04-26

- Analysis of a Short Circuit Fault in a 220 kV Gas Insulated Switchgear
- High VoltageApparatus Vol. 49, Issue 8, Pages: 115-118(2013)
- 作者机构：
  
  江苏省电力公司检修分公司苏州分部
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2013.08.020
  CLC： TM595
- Published：2013
- 稿件说明：
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[1]禹化然,蒋伟毅,徐嵘.一起220kV GIS内部短路故障分析[J].高压电器,2013,49(08):115-118.

YU Hua-ran, JIANG Wei-yi, XU Rong. Analysis of a Short Circuit Fault in a 220 kV Gas Insulated Switchgear[J]. High voltageapparatus, 2013, 49(8): 115-118.
[1]禹化然,蒋伟毅,徐嵘.一起220kV GIS内部短路故障分析[J].高压电器,2013,49(08):115-118. DOI： 10.13296/j.1001-1609.hva.2013.08.020.

YU Hua-ran, JIANG Wei-yi, XU Rong. Analysis of a Short Circuit Fault in a 220 kV Gas Insulated Switchgear[J]. High voltageapparatus, 2013, 49(8): 115-118. DOI： 10.13296/j.1001-1609.hva.2013.08.020.

摘要

针对一起220 kV GIS现场启动送电时发生内部短路故障造成绝缘子表面烧损问题

分析和验证了可能引起故障的各种原因。结果表明在产品安装过程中两法兰对接时

密封圈处的硅脂涂抹过多

部分硅脂粘到盆式绝缘子上形成一层油膜

而SF6中微水含量较高

水分在油膜及绝缘子上凝结

大大降低了绝缘强度

最终导致故障发生。出厂和现场交接试验的不全面

未将隐患及时查出也是造成故障的重要原因。最后总结了事故的经验教训

提出了防范措施

避免同类故障再次发生

确保现场送电安全可靠。

Abstract

A short circuit fault in a new 220 kV gas insulated switchgear（GIS） happened when the GIS was starting

leading to surface burn of insulator.In this study

the possible causes of the fault are analyzed and verified.The result shows that excessive silicone grease on the seal ring results in this fault

where some grease sticks to the basin-type insulator spacer to form an grease film while mating two flanges

and the moisture in SF6 gas condenses on the film and the insulator to reduce the dielectric strength greatly.Besides

insufficient delivery test and acceptance test are also one of the causes of the fault.Some precautionary measures are proposed to insure the GIS against this kind of faults.

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