The electrical characteristics of high impedance grounding faults in distribution network are affected by the grounding medium

network parameters and noise. Traditional feeder selection methods of high impedance grounding have poor applicability and reliability under complex fault scenarios. In response to this problem

the correction between differential voltage and feeder current of high resistance ground fault in resonant grounded system is analyzed. The Lissajous curve in characteristic frequency band are constructed

with the slope of curve selected as the criterion for fault feeder selection. Then

considering the influence of system compensation

damping ratio and length of fault line on the curve characteristics

the applicable boundary of Lissajous curve is deduced

and the principle for extending from fault feeder selection to section location are discussed. A tuning free fault feeder selection and section location method based on the synchronous Lissajous curve slope is proposed using synchronous waveforms synthesized from synchronous phasor measurement devices in distribution network and least squares fitting. Additionally

a group comparison method is used to compensate for the location dead zone under the scenarios of insufficient measurement. Finally

extensive simulation experiments and real-world case studies validated the effectiveness and reliability of the proposed method.