电容式电压互感器绝缘击穿故障处理及防范措施

Fault Treatment and Precautionary Measure of Capacitor Voltage Transformer Insulation Breakdown

电容式电压互感器作为一次电压监测设备,其运行状况直接影响变电站内二次电压正确采集及继电保护装置可靠动作。针对某220 kV变电站日常巡视中发现某段母线开口三角电压异常现象,通过二次回路排查及故障录波分析,故障原因为电容式电压互感器分压电容末端大N端子与开口三角da端子间绝缘击穿,导致二次接线板结构破坏。并结合生产实际提出相应的防范措施,为变电站日常巡视及类似缺陷处理提供参考。

Capacitor voltage transformer is used as a primary voltage monitoring device.Its operational state directly affects the correct acquisition of secondary voltage in the substation and reliable operation of the relay protection device.According to a 220 kV substation daily patrol finding a section of bus opened triangle voltage abnormal phenomenon,though the secondary circuit trouble shooting and fault recording,it analysizes the fault cause is an insulation breakdown between the end large N terminal and the open triangle da ter⁃minal of the capacitor voltage transformer voltage,resulting in the structural destruction of the secondary wiring board.It puts forward the corresponding preventive measures which providing a certain reference for the daily inspection of transformer substation and the treatment of similar defects.