The characteristics of fault voltage waveforms generated by generator stator single phase grounding fault turned to grounding in high impedance mode are analyzed and the point of failure transient resistance is calculated and derived via the MATLAB. By proceeding from the mechanism of ferro-resonance

the sequence of the main transformer’s low voltage side grounding fault and the start and stop time of the voltage transformer ferro-resonance is distinguished and the location of the fault point is judged

providing a basis for fault inspection.