共用接地极引起站内接地网过流保护76SG动作事件分析及防控

Analysis and Prevention of 76SG Action Event by Overcurrent Protection of Grounding Grid in Station Caused by Common Grounding Electrode

某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内接地网过流保护76SG动作,分析保护动作原因,并提出防控措施与解决办法,对消除共用接地极隐患具有重要参考意义。

76SG was action by a grounding grid overcurrent protection in a station during a single-maximum return line mode conversion to a single-pole metal return line mode.The cause of protection action was analyzed,and the prevention and control measures and solutions were put forward,which had important reference significance for eliminating the hidden danger of the common grounding electrode.