一起注入式转子接地保护误动作的原因分析及处理

Cause Analysis and Treatment of A Misoperation of Injected Rotor Grounding Protection

某电厂660 MW燃煤机组双端注入式RCS985转子接地保护装置因大轴接地碳刷接触不良造成接地报警,文章分析其报警原因与防控措施,针对转子接地保护在日常维护工作中可能会产生接地告警的地方进行介绍,为电厂继电保护维护人员提供处理思路,缩短故障查找时间,保障机组安全稳定运行,对同类型电厂有借鉴意义。

The double-ended injection type RCS985 rotor grounding protection device for a 660 MW coal-fired unit in a power plant caused a grounding alarm due to poor contact of the large shaft grounding carbon brush.The alarm causes and prevention and control measures were analyzed.The places where grounding alarms may occur during daily maintenance work of the rotor grounding protection were introduced,providing treatment ideas for relay protection maintenance personnel in the power plant,shortening fault finding time,and ensuring safe and stable operation of the unit.It has reference significance for similar power plants.