接地极共用导致站接地网过流保护76SG动作事件分析

摘要

In view of the overcurrent protection 76 SG 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.%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.