220 kV GIS电压互感器贯穿性接地故障分析及防范措施研究

Reason Analysis and Precautionary Measures for a Penetrating Grounding Fault of 220 kV GIS Voltage Transformer

针对一起220 kV GIS母线电磁式电压互感器贯穿性接地故障进行调查分析,通过故障录波情况、设备返厂后的诊断试验、解体检查,结合变电站的系统运行方式和故障电压互感器的结构,对贯穿性接地故障的产生和发展原因进行了分析和总结,提出了预防此类故障发生应采取的措施,分析结果对提高GIS电磁式电压互感器运行的可靠性具有重要意义。

This paper investigates and analyzes the penetrating grounding fault for a 220 kV GIS bus voltage transformer.Firstly,based on the fault recording,the diagnosis test for the equipment returned to the factory and the inspection under the disassembled condition,the paper combines the system operation mode of substation and the structure of faulty voltage transformer to analyze and summarize the causes and developments of penetrating ground faults.And then the paper proposes the measures that should be taken to prevent the occurrence of such faults.The analysis results are of great significance to improving the reliability of GIS electromagnetic voltage transformer.