王宇,吕旭东,王维振,倪炯,金颖杰
WANG Yu,LYU Xudong,WANG Weizhen,NI Jiong,JIN Yingjie

• 1:国网浙江省电力公司检修分公司

摘要(Abstract)：

某500 k V变电站发生一起因避雷器倾倒引起CVT(电容式电压互感器)分压电容短路并导致保护电压继电器闭锁事故。通过对500 k V CVT现场情况及故障录波图的分析,并结合分析500 k V CVT内部结构及分压原理,计算了由于分压电容短路导致二次侧过电压倍数,计算结果与现场实际情况一致,以此可确定故障原因为避雷器砸中CVT第一、二节间金属连接部分致使第一节电容被短路,为分析CVT类似故障提供了一种可行的判断方法。
This paper introduces short-circuit of capacitive voltage divider of CVT(capacitive voltage transformer) and lock-in of protective voltage relay due to arrester collapse in a 500 k V substation. Based on the on-site situation analysis of the 500 k V CVT and the fault recording as well as its internal structure and voltage dividing principle, secondary side overvoltage multiple caused by capacitive voltage divider is calculated.The calculation result is in consistence with the on-site situation. Therefore, it is determined that the fault is caused by collision between the arrester and the first and second metal connections, which causes short-circuit of the first capacitor. It is a feasible method for similar CVT faults judgment.

关键词(KeyWords)： 电容式电压互感器;过电压;故障分析
CVT;overvoltage;fault analysis

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 王宇,吕旭东,王维振,倪炯,金颖杰
WANG Yu,LYU Xudong,WANG Weizhen,NI Jiong,JIN Yingjie

DOI: 10.19585/j.zjdl.201705006

参考文献(References)：

• [1]王世阁,张军阳.互感器故障及典型案例分析[M].北京:中国电力出版社,2013.
• [2]李丐燕,张金强.一例500 k V CVT电压测量异常分析与处理[J].高压电器,2008,44(1):76-77.
• [3]李顺尧.220 k V电容式电压互感器试验方法探讨[J].高压电器,2008,44(3):280-282.
• [4]刘鲲.变电站二次系统防过电压损坏技术实施方案探讨[J].广东科技,2009(6):217-218.
• [5]张一军,汪卫国.JPB组合式过电压保护器与常见过电压保护器原理的比较分析[J].浙江电力,2005,24(3):61-64.
• [6]胡伟,贡春艳,郑一鸣,等.混合波作用下两级低压浪涌保护器配合规律的研究[J].浙江电力,2016,35(9):1-7.
• [7]刘晓辉,应肖磊.电容式电压互感器二次电压异常的分析及改进建议[J].浙江电力,2004,22(4):74-76.
• [8]张吼,俞恩科,董平,等.200 k V直流电子式电压互感器测量故障分析与处理[J].浙江电力,2015,34(3):70-72.