主变差动保护误跳闸事件分析

Analysis on a Differential Protection False Trip of Main Transformer

针对一起10 kV线路保护区内故障导致35 kV终端变电站主变差动保护动作的事故,通过分析、论证,找出差动保护错误动作的主要原因,提出解决方案,减少主变保护误动作次数及负荷损失,保障电网安全运行。

In view of an event that a fault occurred in a 10 kV line protection area led to the differential protection action of main transformer in 35 kV terminal substation,analysis and demonstration are conducted to find out the main causes of the differential protection false action,and a solution is put forward to reduce the number of main transformer protection false action and load loss,so as to ensure the safe operation of power grid.