山东电力高等专科学校学报

针对一起220 kV气体绝缘金属封闭开关设备(gas insulated metal enclosed switchgear,GIS)内部故障，经现场检查、红外测温、超声波及特高频局部放电检测，以及SF₆气体组分检测、X光检测、回路电阻测试等，判断224-3隔离开关B相存在一次回路虚接。经现场开盖检查发现，224-3隔离开关B相动、静触头处存在烧熔现象。对224-3隔离开关进行解体检查，确定了故障原因，并提出了相应的防范措施，以防止此类故障再次发生。

To address an internal fault in 220 kV gas insulated metal enclosed switchgear(GIS),multiple diagnostic techniques are employed,including on-site inspection,infrared thermometry,ultrasonic and ultra-high frequency partial discharge detection,SF₆ gas composition analysis,X-ray examination,and circuit resistance measurement.Poor contact in the primary circuit of phase B of the 224-3 disconnector is identified.During on-site inspection with the cover removed,burn marks are observed at the moving and fixed contacts of phase B of the 224-3 disconnector.The 224-3 disconnector is disassembled and inspected to identify the cause of the fault. The corresponding preventive measures are proposed to prevent recurrence of such faults.