一起电容式电压互感器二次电压异常故障分析  

Analysis of an Abnormal Secondary Voltage of Capacitive Voltage Transformer

作　　者：赵彦林 周志新 何亮 雷雨田 康勇 陈楠 武霖 李俊廷 ZHAO Yanlin;ZHOU Zhixin;HE liang;LEI Yutian;KANG Yong;CHEN Nan;WU Lin;LI Junting(Yunnan Power Grid Co.,Ltd.Chuxiong Power Supply Bureau,Yunnan Chuxiong 675000,China;Yunnan Electric Power Construction Supervision Consulting Co.,Ltd.,Yunnan Kunming 650000,China)

机构地区：[1]云南电网有限责任公司楚雄供电局,云南楚雄675000 [2]云南电力建设监理咨询有限责任公司,云南昆明650000

出　　处：《电力电容器与无功补偿》2025年第1期114-120,共7页Power Capacitor & Reactive Power Compensation

摘　　要：本文介绍了一起发生在云南地区35 kV主变高压侧电容式电压互感器(CVT)二次侧电压异常降低故障情况,通过结合CVT的结构及工作原理、试验数据和设备解体后内部情况,并使用LTspice电路仿真软件与公式推导对故障原因进行了分析,判断本次故障是由于CVT电磁单元中的并联氧化锌避雷器因阀片老化而被击穿,造成补偿电抗器被短路,电磁单元一次侧电感分量大幅下降,导致电磁单元一次电压变化,从而引起二次电压异常,为今后CVT设备类似的故障排查提供了重要的经验参考。In this paper,a fault of abnormal voltage reduction at the secondary side of capacitor voltage transformer(CVT)on the high voltage side of 35 kV main transformer in Yunnan is introduced.The cause of the fault is analyzed in combination with the structure and operating principle of CVT,test data and the internal situation of the equipment after disassembly,and also by using LT spice circuit simulation software and formula derivation.It is judged that the fault is caused by the breakdown of the shunt zinc oxide arrester in the electromagnetic unit of CVT due to the aging of the valve plate,resulting in the short circuit of the compensation reactor,and the inductance component of the primary side of the electromagnetic unit is decreased greatly,resulting in variation of the primary voltage of the electromagnetic unit,thus causing the abnormality of the secondary voltage.This analysis provides an important experience reference for similar troubleshooting of CVT equipment in the future.

关 键 词：CVT 电压异常 电磁单元 补偿电抗器 

分 类 号：TM4[电气工程—电器]