Power distribution network ground fault research and judgment analysis method

The invention discloses a power distribution network ground fault research and judgment analysis method, and particularly relates to the technical field of power distribution network fault analysis, which comprises the steps of S1, single-phase ground fault judgment under different line conditions, S2, single-phase ground fault transient characteristics and steady-state characteristics in different grounding modes, S3, ground fault active detection of active signal injection, and S5, fault diagnosis. S4, grounding fault comprehensive analysis and judgment of fault high-speed recording; and S5, a power distribution network fault analysis model. The fault line and the non-fault line are judged by detecting the zero-sequence current of each line, the insulation resistance value of the cable is determined by measuring the resistance values of the two ends of the cable, the grounding current usually rises rapidly during transient characteristic detection, and the value is far larger than the current during normal