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

作　　者：周超 王洪富 

机构地区：[1]山东东省临沂供电公司,山东临沂276003

出　　处：《模具工程》2015年第9期74-80,共7页Mould &Die Project

摘　　要：阐述了主变死区故障导致110kV变电站全站失电的保护动作过程及原因分析。通过对现场保护动作报告、录波分析，发现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，无法第一时间内切除故障，引起对侧线路距离Ⅲ段动作、110kV备自投装置动作、主变差动动作等连锁反应，最终造成该变电站全站失电。The paper describes the protective relay operations and reason analysis of a llOkV substation power failure, which was caused by the dead zone fault of the main transformer. By analyzing the protective action report and recorded wave, the paper achieves the reason that caused the substation power failure. As the compound blocking conditions was not open, the high backup protection didn＇ t act, that resulted in impossibility of cutting of the fault at the first time. The fault then caused series of chain reaction such as distance Ⅲ segment protective action of the lateral line differential the protective action of the llOkV spare power automatic switching device, and the action of main transformer, which eventually led to the substation power failure

关 键 词：全站失电 保护死区放障 复压闭锁开放 

分 类 号：TM63[电气工程—电力系统及自动化]