Abstract:

Based on the analysis of the starting criterion of zero-sequence voltage and negative-sequence current,this paper analyzes the characteristics of the single-phase grounding fault of the distribution network at the same time,studies the analysis method of the fault-sequence characteristics,and establishes the single-phase grounding sequence characteristic model. The fault segment area is fused by dual criteria of current and voltage,and the fault segment distance is measured by the impedance method to accurately locate the fault point,and a single-phase ground fault identification based on the fusion of multiple criteria of sequence characteristics is explored.The simulation analysis of single-phase grounding faults verifies the feasibility and correctness of the method,and have guiding significance for the safe operation of the distribution network.

Key words: zero-sequence voltage, negative-sequence current, single-phase grounding fault, impedance method, sequence characteristic, fault identification