一起220 kV线路纵联零序保护动作原因分析  

Cause analysis of a 220 kV line longitudinal zero sequence protection operation

作　　者：陈坤 钟著辉 刘星 CHEN Kun;ZHONG Zhuhui;LIU Xing(Changde Power Supply Company of State Grid Hunan Electric Power Co.,Ltd.,Changde 415000,China)

机构地区：[1]国网湖南省电力有限公司常德供电分公司,湖南常德415000

出　　处：《电气应用》2023年第4期24-29,共6页Electrotechnical Application

基　　金：国网湖南省电力有限公司科技项目(5216J0220003)。

摘　　要：首先介绍了一起220 kV线路纵联零序保护误动作的事件,通过对保护装置录波进行分析,还原了保护整个动作过程。结合现场检查发现相关二次回路存在问题是导致本次事故发生的根本原因。最后根据分析结果提出了相应整改措施和检修建议,以降低继电保护不正确动作风险,提高电网安全稳定运行水平。A misoperation event of longitudinal zero sequence protection of 220 kV line is introduced.The whole operation process of protection is restored by analyzing the recording wave of protection device.Combined with the on-site inspection,it was found that the problem of the related secondary circuit was the root cause of the accident.Finally,according to the analysis results,the corresponding rectification measures and maintenance suggestions are put forward to reduce the risk of incorrect operation of relay protection and improve the safe and stable operation level of power grid.

关 键 词：二次回路 零序电流 纵联零序保护 故障录波 误动作 

分 类 号：TM773[电气工程—电力系统及自动化]