220kV电容式电压互感器的隐患事故分析

通过现场测试,发现电容式电压互感器的电容量误差在国家标准之内,但电容量异常增加,且三相线电压明显不平衡,经进一步试验分析,判定电容器内部串联电容已部分击穿,提出了电容式压变运行及测试相应注意事项。

Analysis of 220kV Capacitor Voltage Transformer's Hidden Fault

Based on the practical tests,It is found that the CVT's capacitance increases abnormally,and the three phase voltages are obviously imbalanced,although the error of CVT′s capacitance is within the requirement specified by the national standard.Through further examination,it can be concluded that the inner in-series capacitors have been partly broken down.The attentions on CVT′s operation and testing are proposed.