长电缆分布电容导致保护回路误动分析

Analysis on the Protection Mal-operation due to Distributed Capacitance of Long Cables

通过某抽水蓄能电站在静止变频器改造过程中出现的保护跳闸事件进行分析,查找出该事件为保护跳闸回路长电缆分布电容较大所引起,同时提出针对性的防范措施以保障设备安全稳定运行。

By analysis on a protection trip event during the transformation of a static frequency converter in a pumped storage power station,it is find out that the event is caused by the large distributed capacitance of the long cables of the trip circuit,and the corresponding preventive measures are proposed to ensure the safe and stable operation of the equipment.