Analysis and Handling of a Case of Abnormal Secondary Voltage of 110 kV GIS Bus PT
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 re-store operation of the intact equipment.The test showed a over-limit SF6 gas content in the gas chamber of the faulty e-quipment,and the disassembly inspection found that the L2 conductor rod and coil connection head were burned.The rea-sons for the anomaly have then been analyzed,and precautions and preventive measures have been proposed,which may contain useful information for avoiding similar faults.
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