750 kV敞开式接地开关异常合闸故障分析

为准确分析某敞开式变电站750kV接地开关在大风天气下异常合闸原因，本文通过现场检查、接地开关动作过程分析、结构件材质分析、受力情况分析，确定了该接地开关异常合闸故障原因为曲臂螺栓尺寸设计不合理及材质不符合要求导致螺栓松脱. 最后基于故障分析结果开展针对性验证试验，制定防范措施，确保了设备安全运行.

Analysis of abnormal closing fault of 750 kV AIS earthing switch

In order to accurately analyze the earthing switch failure causes in windy weather, through the onsite inspection, action process analysis, material analysis of structural parts and the stress condition analysis, this paper confirms that the failure reason of the abnormal closing of this earthing switch is the loosened bolt caused by the unreasonable size design of the crank arm bolt and the unqualified material. Furthermore, the targeted validation tests and preventive measures are carried out to ensure the safe operation of the equipment.