Fault Analysis and Prevention Measures of Busbar Differential Protection Malfunction Caused by Two Grounding Points on Secondary Circuit of Current Transformer
Zhai Baoyu, Ma Tao, Li Kaixin
State Grid Xinjiang Electric Power Research Institute, Urumqi 830011
Abstract：In the power system, in order to prevent the secondary circuit of the current transformer from over-voltage, the secondary circuit must be grounded at one point. However, due to the secondary circuit insulation failure, the installation process is defective or other man-made causes the secondary circuit multi-point grounding, will cause relay protection Device false alarm or even relay protection malfunction accident. In this paper, a case of busbar differential protection malfunction caused by two grounding points on secondary circuit of Current transformer, analysis of the cause of the accident, put forward two-point grounding for the current transformer preventive measures.
翟保豫, 马涛, 李开鑫. 电流二次回路两点接地引起母差保护误动事故分析及预防措施[J]. 电气技术, 2017, 18(4): 143-145.
Zhai Baoyu, Ma Tao, Li Kaixin. Fault Analysis and Prevention Measures of Busbar Differential Protection Malfunction Caused by Two Grounding Points on Secondary Circuit of Current Transformer. Electrical Engineering, 2017, 18(4): 143-145.
2017, Vol. 18 
