GW7B-550型接地开关故障缺陷分析与处理

Fault Analysis and Treatment of GW7B-550 Grounding Switch

针对GW7B-550型接地开关3个固定螺栓掉落,1个松脱情况,理论仿真计算和模拟试验分析接地开关受力情况,最终确定由接地刀闸导电杆与传动曲臂连接异常、闭锁失效,在大风外力作用下,导电杆逐步抬起,造成单相接地引发故障。

In view of the drop of 3 fixing bolts and one loosening of the GW7B-550 grounding switch,the stress of grounding switch is analyzed by theoretical simulation calculation and simulation test.Finally,it is determined that the connection between the conductive rod of the grounding knife switch and the transmission crank arm is abnormal and the locking is invalid.Under the action of strong wind,the conducting rod is gradually raised,resulting in single-phase ground fault.