Fault analysis of secondary zero-sequence voltage abnormal fluctuation of 110kV capacitive voltage transformer
HAN Muyao1, LUO Haowen2, LIU Aoyang2, LIAO Xuan2, WANG Kaixin2
1. China Three Gorges University, Yichang, Hubei 443002; 2. Jingmen Power Supply Company, State Grid Hubei Power Electric Co., Ltd, Jingmen, Hubei 448200
Abstract：This paper analyzes the abnormal fluctuation of secondary zero-sequence voltage in 110kV capacitive voltage transformer. By viewing the field fault record waveforms and checking the condition of the secondary voltage loop voltage transformer, it is found that the fault is caused by insulation breakdown between the terminal N of the voltage transformer and the open triangular winding (secondary zero-sequence voltage loop). The discharge current generated in the primary side of the voltage transformer circulates in the open triangular winding, which causes abnormal fluctuation of the secondary zero-sequence voltage. In view of the problems exposed by this incident, some thoughts and suggestions on routine inspection of secondary equipment are given at last.
韩慕尧, 罗皓文, 刘傲洋, 廖玄, 望开新. 一起110kV电容式电压互感器二次零序电压异常波动故障分析[J]. 电气技术, 2021, 22(12): 53-56.
HAN Muyao, LUO Haowen, LIU Aoyang, LIAO Xuan, WANG Kaixin. Fault analysis of secondary zero-sequence voltage abnormal fluctuation of 110kV capacitive voltage transformer. Electrical Engineering, 2021, 22(12): 53-56.
2021, Vol. 22 
