一起110 kV GIS母线PT二次电压异常分析与处理

Analysis and Handling of a Case of Abnormal Secondary Voltage of 110 kV GIS Bus PT

变电运维人员发现电压互感器二次电压异常,及时排查并确定故障范围,执行倒闸操作方案将故障隔离并恢复完好设备运行。试验发现故障设备气室SF6气体超标,解体检查发现L2导电杆与线圈连接头烧损。为此,分析了导致异常的原因,提出了注意事项和防范措施,为避免其他变电站发生类似电压异常提供借鉴。

The operation and maintenance personnel in an actual substation discovered abnormal secondary voltage of PT,promptly investigated and determined the fault range,implemented a reverse switch operation to isolate the fault and restore operation of the intact equipment.The test showed a over-limit SF 6 gas content in the gas chamber of the faulty equipment,and the disassembly inspection found that the L2 conductor rod and coil connection head were burned.The reasons for the anomaly have then been analyzed,and precautions and preventive measures have been proposed,which may contain useful information for avoiding similar faults.