Analysis of Grounding Fault of Overhead Broken Line in Distribution Network

In the medium and low power distribution system of 6-66kV, the single-phase broken line grounding fault of overhead line often occurs, which endangers personal safety and affects the normal operation of power load. Under the premise of considering the nature of the load on the grounding point, the current and voltage of the protection installation point, the broken point, the grounding point and the load side when the single-phase broken line grounding fault in power distribution system with neutral non-effectively grounded are analyzed, and the calculation formula of the voltage and current at each point is derived. The analysis results shows that the voltage of protection installation, grounding point and load side is related to load properties and transition resistance. The voltage at the broken point is related to the load properties. In this paper, a real distribution network grounding fault is analyzed, focusing on the grounding protection action and fault disposal.