某电厂主变高压侧单相接地造成电网参数波动的分析

某电厂 5 号机组处于调试启动阶段,5GIL 内部绝缘子发生处接地故障,5 号机主变压器失电,期间造成 1/2/3/4 号机组电功率、母线电压参数波动。通过对解体检查发现,5GIL A 相接地原因为绝缘子故障导致。文中针对此故障进行原因分析,以此探讨 GIL 运行稳定性同时提出参数波动优化改进措施。Abstract:Unit 5 of power plant is in debugging start-up phase, Grounding failure at internal insulator of GIL cause fluctuation of power and bus voltage parameters of unit 1/2/3/4.Through disassembly check, it is found that 5GIL A phase grounding is caused by insulator failure. In this paper, the cause of this failure is analyzed, in order to explore the GIL operation stability, and at the same time, parameter fluctuation optimization improvement measures are proposed.