一起主变死区故障导致110kV变电站全站失电事故分析  

Fault Analysis of A 110 kV Substation Total Power Loss Caused by Dead Zone Fault of Main Transformer

作　　者：周超 王洪富 李洪成 刘长道 王飞飞 

机构地区：[1]国网山东省电力公司临沂供电公司,山东临沂276003

出　　处：《电力学报》2015年第2期143-148,共6页Journal of Electric Power

摘　　要：阐述了主变死区故障导致110kV变电站全站失电的动作过程、原因和改进措施。通过对现场保护动作报告、录波分析,当故障点在主变低压侧开关和CT之间时,主变高后备保护因复压闭锁条件未开放造成高后备未动作,引起对侧线路距离Ⅲ段动作、110kV备自投装置动作、主变差动动作,造成全站失电。The paper describes the relay operation,reason and improvement measures of a 110 kV substation power failure caused by the dead zone fault of a main transformer. By analyzing the protective action report and recorded wave, the high backup protection didn＇t act, because the compound blocking condition was not open. Then the fault caused distance Ⅲ segment action of the lateral line, the protective action of the 110 kV spare power automatic switching device, and the differential action of main transformer, which eventually led to the substation power failure.

关 键 词：继电保护 全站失电 保护死区故障 复压闭锁开放 

分 类 号：TM63[电气工程—电力系统及自动化]