一起直流一点接地误跳500kV线路原因分析  

The Analysis of a 500kV Line Trouble-free Trip Caused by the DC One-point Grounding

作　　者：张金枝 李智 

机构地区：[1]芜湖供电公司,安徽芜湖241000

出　　处：《安徽电气工程职业技术学院学报》2011年第1期1-4,共4页Journal of Anhui Electrical Engineering Professional Technique College

摘　　要：文中介绍了某500kV变电站在处理110V直流系统一点接地故障时发生一条500kV线路无故障跳闸过程;通过分析发现直流系统电容电流在一点接地时有充放电现象,分析了直流一点接地时造成保护动作的原因,并从变电运行的角度提出了此类故障处理策略。The paper introduces the dealing of an 110V DC grounding fault at one-point which causes a 500kV line trouble-free trip in a 500kV substation.Through in-depth analysis,it′s found that there is charging and discharging phenomena when the DC system capacitive current grounding at one-point.The paper describes the reason of the DC one-point grounding what causes protection action,and proposes the treatment strategy of such fault from the angle of substation running.

关 键 词：变电站 直流一点接地 继电器 跳闸 原因分析 

分 类 号：TM774[电气工程—电力系统及自动化]