一起励磁系统故障误跳的事故分析与防范措施

Analysis and Preventive Measures for an Accident of False Trip of Excitation System

通过一起现场案例分析由于励磁调节器误发故障信号引起转子接地保护误动作,造成1000 MW机组事故跳闸。对事故原因进行阐述分析并通过相关改进防范措施,有效杜绝励磁系统误动引起机组跳闸,通过数年的稳定运行证明了整改后的励磁系统的安全可靠性,也为类似的励磁系统设计与配置提供一定的参考。

In a field case study,the fault signal of excitation regulator causes the fault action of rotor grounding protection,which results in the emergency trip of 1000 MW unit.The causes of the accident are analyzed and the relevant improvement and prevention measures are taken to effectively prevent the unit trip caused by the fault operation of the excitation system.The years of stable operation has proved the safety and reliability of this rectified excitation system,which also provides certain reference for the design and configuration of similar excitation systems.