一起站用交流馈线开关跳闸的故障分析

A Fault Analysis of AC Feeder Switch Trip in Station

针对一起某110 kV变电站380 V站用交流电源系统馈线开关多次跳闸故障,通过现场排查及计算分析故障原因,即分列运行的#1、#2交流系统的多个环网馈线开关错误地同时合上,导致交流系统C相三路环网故障,当环网电流达到主馈开关的不平衡电流保护整定值时,主馈开关正确跳闸,切除故障。为此提出了需核查交流系统的所有回路,并对形成的开关投退表、级差配合表逐个核对,对于环网馈线开关,需调整指示灯至负载相的整改措施。

A 110 kV substation had multiple trip faults in the feeder switch of the AC power system for 380 V station.Through on-site investigation and calculation and analysis of the cause of the fault,that is,the multiple ring network feeder switches of the#1 and#2 AC systems operated separately were incorrectly closed at the same time,resulting in the AC system C phase three-way ring network failure,when the ring network current reached the unbalanced current protection setting value of the main feeder switch,the main feeder switch tripped,cut off the fault.To this end,it is proposed to check all circuits of the AC system,and check the formed switch return table and grade difference cooperation table one by one.For ring feeder switches,the corrective measures to adjust the indicator to the load phase need to be adjusted.