CVT二次电压异常原因及对策分析

介绍一起500 kV电容式电压互感器（简称CVT）二次电压异常故障,通过现场检查、红外测温及带电测试等手段,确定二次电压异常的原因为二次回路小刀闸触头氧化所致,总结了二次电压出现异常时查找故障的方法和顺序,提出一种取代二次小刀闸的改造方案,该方案能有效提高设备安全运行状态,同时对提高关口电能计量水平有积极意义。

Causes Analysis and Countermeasures on Abnormal Secondary Voltage of CVT

In this paper,the secondary voltage fault of a 500 kV capacitor voltage transformer（CVT）is introduced.The abnormal cause of the secondary voltage is,throughout site inspection,infrared temperature measurement and live testing etc,determined as the contact oxidation of the secondary circuit isolating switch.The method and sequence for finding the abnormal fault of secondary voltage is summarized,one kind of modification plan on replacing secondary isolating switch is proposed,which can improve effectively healthy operation condition of the equipment and,at the same time,has positive significance in enhancing electric energy metering level CVT.