接地极共用导致站接地网过流保护76SG动作事件分析  

Analysis of Overcurrent Protection 76SG Action Caused by Common Grounding Electrode

作　　者：王蒙 刘茂涛 WANG Meng;LIU Maotao(Guangzhou Bureau,CSG EHV Power Transmission Company,Guangzhou 510405,China)

机构地区：[1]南方电网超高压输电公司广州局,广东广州510405

出　　处：《电工技术》2019年第3期64-65,68,共3页Electric Engineering

摘　　要：某直流换流站在一次单极大地回线方式转单极金属回线方式过程中站接地网过流保护76SG动作,分析了保护动作原因,阐述了两回直流共用接地极电流分流至另一回的机理,并提出防范措施和建议。In view of the overcurrent protection 76SG action in the process of GR to MR in a DC converter station, this paper analyzes the reason for the protection action,introduces the principle of current being shunted to another caused by the common grounding electrode of two circuit DC,and proposes preventive measures and recommendations.

关 键 词：共用接地极 过流保护76SG接地极电流 分流 

分 类 号：TM771[电气工程—电力系统及自动化]