区外故障引发变电所整流变跳闸的原因分析

Reason Analysis of Substation Rectifier Transformer Trip Caused by Out-regional Fault

随着青海桥头铝电有限公司一期电解铝大容量整流变压器相继投入运行,运行期间多次发生区外接地故障,从而导致整流变低压侧分支电流速断保护误动致使整流变全部跳闸,给该公司和电网的安全稳定运行构成了严重的威胁,曾使西北电网频率越线告警,引起西北电网的高度重视。文章通过对误动原因的分析,找出了原因并提出了解决措施。

Along with the aluminum - electrolyzed large capacity rectifier transformer of Qinghai Qiaotou Aluminum - Electric Power Plant first phase puts into operation, the out - regional ground fault happened several times, which leads to misoperating of branch current quick - break protection for rectifier transformer low voltage, and rectifier transformer trip, thus seriously threatens grid safety. Through analyzing the misoperating reason, the paper founds the reason and puts forward the solving method.