Single phase grounding fault location based on frequency domain characteristics of fault current

This paper studies the fault current frequency spectrum characteristics of single phase ground fault in ungrounded distribution networks, and the fault location method based on it. Firstly, it analyzes the production mechanism of 2^nd major frequency component, and the relationship between the 2^nd major frequency component and series resonance frequency of the faulted line. Secondly, from the perspectives of lumped-parameter circuit, the relationship between 2^nd major frequency component and fault location is deduced. Simulation cases are used to confirm the relationship. Last, the impact of load and initial fault phase angle on the 2^nd major frequency component are researched. Simulation research proves the feasibility of the fault detection and location method based on frequency domain characteristics.