直流故障引起的线路保护误动作事件分析  

The Analysis of a Mal-operation Accident of Relay Protection Caused by DC System Fault

作　　者：刘孝刚[1] 黄浩声[2] 崔晓祥[1] 蔡振辉[1] 

机构地区：[1]江苏省电力公司检修分公司,江苏南京211102 [2]江苏省电力公司电力科学研究院,江苏南京211103

出　　处：《江苏电机工程》2014年第4期21-23,共3页Jiangsu Electrical Engineering

摘　　要：直流系统的可靠对于变电站的安全运行至关重要。文中针对一起区外故障下线路保护动作事件,阐述了该故障分析思路和排查方法,通过对直流监测系统动作信息、保护录波图进行分析,确定故障原因是由于单个蓄电池内部故障引发的故障范围扩大,最后针对存在的缺陷提出了整改和防范措施。Reliable operation of DC system is very important for safe operation of substation. This paper uses an actual accident of the mal-operation of line protection caused by the rapid decline of DC voltage during the external fault to elaborate the analytical means of accidents. By analyzing the trip reports in DC system and fault records in line protection, it is confirmed that the expansion of fault area is caused by the internal fault of a single battery. Finally, several methods to improve supply reliability and avoid the similar accident are proposed.

关 键 词：直流故障 区外故障 保护动作 

分 类 号：TM773[电气工程—电力系统及自动化]