220kV变电站PT事故及母线保护误动事故分析

Analysis of PT Accident and Bus Protection Malpractice in 220kV Substation

通过某220kV变电站的PT爆炸事故案例,从技术角度对PT设备及220kV母线保护存在的缺陷进行了分析。发现事故原因后,对站内所有电压互感器极性及接线进行检查,对电压的二次回路进行通压;对站内所有电流互感器极性进行检查,对电流回路进行一次通流,检验各回路的保护动作正确。

Through the ease of PT explosion in the 220 kV substation, the defects of PT equipment and 220kV busbar protections are analyzed from the technical point of view. After the cause of the aecidentwas found, all voltage transformer polarity and wiringof the station wasinspected, the two loop of voltage was supplied electric voltage on the station, and all current transformer polarity was checked and adjusted.The current loop was switched on, the right operation of the differential protectionwas tested.Through above methods, the idea of fault analysis and the method of troubleshooting are expounded, and all the voltage and current circuits after the rectification are fully tested.