Design of fault line selection for small current grounding system in distribution network

With the increase of the coverage area of the domestic distribution network, the probability of failure of the distribution network system is also greatly increased. In this paper, a grounding fault line selection system is designed for the small current grounding system of the distribution network. Firstly, taking the fault recorder as the data source, a single-phase grounding fault line selection system is built to monitor the single-phase grounding fault of the small current grounding system in the distribution network of each substation and select the fault line accurately and quickly. Finally, a 380 V physical simulation platform is built to simulate the fault line selection test. Taking Changchun area as an example, a single-phase ground fault occurs in the 66 kV system of Jingyang substation. Through the analysis of the system, the feasibility and accuracy of the line selection system are verified