This article introduces a novel fault line selecting method which is based on the wavelet packet energy. With the db10 wavelet packet decomposition of zero-sequence transient current signal of the fault branch line, it can eliminate the component of base band of reflecting the fundamental frequency. Based on this, it can get wavelet energy of the various branch line. If a line of energy is obvious superior in contrast with the other line energy, then it is the first decision for branch line fault. Secondly, it can give the possible fault line sorting according to the principle of from large to smalland start the circuit recluse to monitor the current of the order in sequence. While 3U0 is disappeared, then determining the fault line is the maximum energy lines. If not, then continuing to monitor energy big line until the fault line is selected. The simulation results show that the accuracy rate of the fault circuit selecting method is higher, it can be applied to the fault circuit selecting of cable mixed in distribution networks.
Single-phase grounding fault line selection method based on zero-sequence current increment
