Research on fault routing method of distribution network based on wavelet transform*

To refine the accuracy of fault location in the case of single-phase ground faults in distribution networks, this research delves into the ephemeral part of the fault signal that arises from these faults, and forms a fault routing scheme based on the transient energy method and the great value detection method of wavelet transform. To enhance the distinction between the transient signatures of a faulted line and a healthy line in the aftermath of a ground fault, this study applies wavelet transform to dissect and then reassemble the zero-sequence current signals across every line, captures the high-frequency wavelet coefficients, and subsequently measures the energy across each high-frequency range and the eigenfrequency range, pinpointing the maximum energy and modal peak for every line. The detection of faulty lines is achieved by comparing the maximum energy of every line with the modal maximum to differentiate between faulty and sound lines.