500 kV交流滤波器保护动作原因分析及防范措施

Cause Analysis and Preventive Measures of Protection Action of 500 kV AC Filter

针对A站500 kV交流滤波器保护动作事件进行分析,通过原因排查,认为造成该次故障的主要原因为鸟害,使得电容器组间产生空间隙,降低了组间的绝缘强度,造成桥臂间电容值不平衡,导致滤波器不平衡保护动作跳闸。提出在站内500 kV交流滤波器区域安装驱鸟器等措施。

The protection action event of 500 kV AC filter in station A is analyzed.Through cause investigation,it is believed that the main cause of this failure is bird damage,which resultes in empty gap between capacitor banks,reduces the insulation strength between capacitor banks,causes the capacitor value imbalance between bridge arms,and leads to the tripping of the filter unbalanced protection action.Measures such as installing devices of driving birds in the 500 kV AC filter area of the station are proposed in this paper.