Analysis on Restrike Faults Occurring in Class C2 Back-to-back Capacitor Bank Switching Tests of 500 kV ACF Circuit Breakers

YANG Xu; ZHANG Changhong; LI Weiguo; CHEN Weimin

doi:10.13296/j.1001-1609.hva.2019.12.036

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Analysis on Restrike Faults Occurring in Class C2 Back-to-back Capacitor Bank Switching Tests of 500 kV ACF Circuit Breakers

更新时间：2025-04-26

- Analysis on Restrike Faults Occurring in Class C2 Back-to-back Capacitor Bank Switching Tests of 500 kV ACF Circuit Breakers
- High VoltageApparatus Vol. 55, Issue 12, Pages: 240-247(2019)
- 作者机构：
  
  南方电网超高压输电公司检修试验中心
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2019.12.036
  CLC： TM53;TM561
- Published：2019
- 稿件说明：
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[1]杨旭,张长虹,黎卫国,陈伟民.500 kV ACF断路器C2级背对背电容器组开合试验重击穿故障及其原因分析[J].高压电器,2019,55(12):240-247.

YANG Xu, ZHANG Changhong, LI Weiguo, et al. Analysis on Restrike Faults Occurring in Class C2 Back-to-back Capacitor Bank Switching Tests of 500 kV ACF Circuit Breakers[J]. High voltageapparatus, 2019, 55(12): 240-247.
[1]杨旭,张长虹,黎卫国,陈伟民.500 kV ACF断路器C2级背对背电容器组开合试验重击穿故障及其原因分析[J].高压电器,2019,55(12):240-247. DOI： 10.13296/j.1001-1609.hva.2019.12.036.

YANG Xu, ZHANG Changhong, LI Weiguo, et al. Analysis on Restrike Faults Occurring in Class C2 Back-to-back Capacitor Bank Switching Tests of 500 kV ACF Circuit Breakers[J]. High voltageapparatus, 2019, 55(12): 240-247. DOI： 10.13296/j.1001-1609.hva.2019.12.036.

摘要

文中对ACF断路器C2级背对背电容器组开合试验重击穿事故进行逐级分析

通过分析故障波形和外闪发展路径全过程

对关键部件开展检测

同时结合解体情况和电场仿真

分析了在试验参数高于国家标准的严苛工况下进行容性开合试验时重击穿发生的原因。分析结果表明

造成3次重击穿的主要原因有:11/2极关合试验导致断口烧蚀不均;2多次开合机械磨损产生的金属碎屑会在开断间隙较小时引起内绝缘下降;3均压电容内部损伤导致分压不均。最后

针对ACF断路器C2级容性开合试验提出了产品改进和试验步骤优化设计方案。

Abstract

The restrike faults occurred during class C2 back-to-back capacitor bank switching tests for ACF circuit breakers are analyzed.The testing parameters selected for the tests are much stricter than those recommended in the national standard.The causes of the faults are explored through tracking the whole process of fault recording and flashover developing paths

and detecting the key components.Further

disintegration and electric field simulation of the main parts are conducted for the fault analysis.It is concluded that there are three main reasons for the faults:1)1/2 pole closing test resulted in the uneven erosion distribution between two breaks;2) the metal chips from mechanical abrasion due to frequent switching reduced the insulation strength in a short interrupting instant;and 3) the inner damages of grading capacitors led to uneven voltage distribution between breakers.In addition

the ways to improve the design of ACF circuit breaker and optimize the procedure of the class C2 switching test are offered.

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