Wire selection method for power distribution network single phase earthing failure based on transient signal

The invention discloses a distribution network single-phase ground fault route selection method based on a transitional quantity signal. The method comprises the following steps: determining the initial time of the fault; the adaptive selection of the characteristic frequency-band; and calculating and comparing the transient zero-sequence current-component amplitude value in the characteristic frequency-band; the invention definitely distinguish the fault line and the healthy line by using the characteristic that the abundant transient high-frequency component is include in the fault current at the moment of occurrence of the single-phase ground fault; and the method can adaptively determine the characteristic frequency-band and perform fault route selection by using the characteristic quantity of the transient zero-sequence current in the characteristic frequency-band, and the success ratio reaches above 99 percent through a great mount of simulation and the field data test, and is far higher than that of the route selection method in the prior art at present. The route selection method can be applied to the fault route selection for the transformer station where the neutral point is not grounded and is not directly grounded.