Zero Sequence Admittance based Fault Location in Low Resistance Grounding Distribution System

Abstract

High fault transition resistance and the integration of distributed generations (DGs) make it difficult for single phase-to-earth fault location in distribution systems. This paper presents a method for single phase-to-earth fault section location in low resistance grounding system based on the measured synchronized zero sequence admittance. The measured zero sequence admittance is calculated by local PMU and then be sent to the operation center. The upstream or downstream of the fault point is judged based on the measured admittance angle. This fault section method is not affected by fault transition resistance, and can be suitable for different grid connected transform grounding modes of DG. The feasibility and accuracy of this proposed method is proved by the PSCAD simulation results.