Single-phase Grounding Fault Line Selection Method Based on the Difference of Electric Energy Information Between the Distribution End and the Load End

This paper constructs a 110kv distribution network simulation model to simulate and analyze the changes of electrical energy information at various locations after single-phase grounding short-circuit faults occur on different lines of the distribution network. The results show that: when a single-phase grounding short circuit occurs in the distribution network, the power on the bus will definitely undergo a sudden change. When the bus fails, the power on line 1 and line 2 does not change much; when line 1 or line 2 fails, the power at the delivery end of the faulty line changes suddenly. The power on the load side of the faulty line and the normal line does not change much. When the fault is eliminated, the sudden change of power will re-enter the steady state after oscillating attenuated. Based on the fault characteristics, a route selection method based on the change of power selection coefficient is proposed. The method is based on the existing electric energy information of the distribution network, no other equipment is required, and has high economic efficiency. At the same time, the method can monitor electric energy information online in real time and find faulty lines in time. This method has high accuracy of line selection.