Case Study of a Discharge Fault in 110 kV GIS PT Chamber

LI Jun-hao; HOU Xin-yu; LI Hai-tao; YUE Ya-li; MO Zhong-hui

doi:10.13296/j.1001-1609.hva.2013.12.026

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Case Study of a Discharge Fault in 110 kV GIS PT Chamber

更新时间：2025-04-26

- Case Study of a Discharge Fault in 110 kV GIS PT Chamber
- High VoltageApparatus Vol. 49, Issue 12, Pages: 141-144(2013)
- 作者机构：
  
  1. 西安交通大学电气工程学院
  2. 广东电网公司湛江供电局
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2013.12.026
  CLC： TM595
- Published：2013
- 稿件说明：
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[1]李军浩,侯欣宇,李海涛,岳亚丽,莫仲辉.一起110 kV GIS PT气室放电缺陷的检测与分析[J].高压电器,2013,49(12):141-144.

LI Jun-hao, HOU Xin-yu, LI Hai-tao, et al. Case Study of a Discharge Fault in 110 kV GIS PT Chamber[J]. High voltageapparatus, 2013, 49(12): 141-144.
[1]李军浩,侯欣宇,李海涛,岳亚丽,莫仲辉.一起110 kV GIS PT气室放电缺陷的检测与分析[J].高压电器,2013,49(12):141-144. DOI： 10.13296/j.1001-1609.hva.2013.12.026.

LI Jun-hao, HOU Xin-yu, LI Hai-tao, et al. Case Study of a Discharge Fault in 110 kV GIS PT Chamber[J]. High voltageapparatus, 2013, 49(12): 141-144. DOI： 10.13296/j.1001-1609.hva.2013.12.026.

摘要

通过对普测过程中发现的一起110 kV GIS PT气室放电缺陷进行SF6气体分解物和特高频局部放电检测

发现该气室内出现了多种SF6气体分解物且体积分数较高

特高频检测其放电幅值超过-20 dBm

停运解体发现是由于PT气室内C相侧屏蔽板与铁心夹件之间的连接螺栓松动

导致接触不良发生悬浮电位放电

通过分析明确了缺陷产生的原因

提出将原侧屏蔽板与铁心夹件之间采用绝缘垫块连接

侧屏蔽板与底屏蔽板通过单独的接地线连接

并与铁屑夹件可靠连接的整改措施。

Abstract

A discharge fault in a 110 kV GIS PT chamber was investigated via measurement of SF6decomposition products and UHF partial discharge detection. A variety of SF6decomposition products at high level were found in the chamber. UHF partial discharge detection indicated a discharge amplitude of over-20 dBm. Disassembly inspection showed that the discharge was generated by the floating potential due to poor contact between the shield plate at C-phase side and the core clamp in the PT gas chamber.Accordingly

measures for improving the contact are proposed.

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