一起220 kV线路开关双跳动作分析及处理

Analysis and Treatment of Double Trip Action of 220 kV Line Switch

针对某变电站进行220 kV线路II的开关非全相试验,220 kV线路I出现单相跳闸、延时重合和三相跳闸现象。对事故原因进行分析,经过现场检查发现,与站内两组直流系统的接地以及混电有很大关联。消除直流接地点和混电点后,220 kV线路I的开关不再误动作,电网恢复稳定运行。

A substation conducted a non-full-phase switch test on 220 kV line II,which resulted in single jump,delayed coincidence and triple jump of 220 kV line I.After on-site inspection,it was found that there were many connections to the ground and mixed power of the DC system of the station connector.After removing the grounding point and hybrid point,the switch of 220 kV line I no longer malfunctioned,and the power grid returned to stable operation.