摘要
针对某110 kV线路交叉跨越距离不够引发的差动保护动作情况,利用录波数据及告警信息从故障现象、保护原理、现场检查整改等方面进行全面分析,查找出站所主变间隙距离不够导致误击穿、电流回路二次接线极性接反导致故障测距错误等问题,同时排查类似二次接线存在的问题,提出防止保护误动、拒动的相关措施,明确落实反措要点的重要性。
Based on the differential protection action caused by insufficient cross-over distance of an 110 kV transmission line,fault recorder and alarm information were analyzed by using the fault phenomenon,protection principle and on-site inspection.It was found out that inadequate neutral gap of transformer leaded to wrong breakdown.The reason of locating faults was secondary circuit polarity error of current circuit.At the same time,the problems of similar secondary circuit were investigated,and the improvement measures to prevent protection malfunction and refusal were put forward.
作者
顾沈卉
王学英
霍西锋
李向锋
何权民
GU Shenhui;WANG Xueying;HUO Xifeng;LI Xiangfeng;HE Quanmin(Chang Qing Water and Power Supply Department,Xi′an 710201,China)
出处
《电工技术》
2019年第23期46-47,62,共3页
Electric Engineering
关键词
继电保护
主变间隙
二次回路
relay protection
neutral gap of transformer
secondary circuit
