Faulty line selection by comparing the amplitudes of transient zero sequence current in the special frequency band for power distribution networks

Abstract

This paper proposes a faulty-line-selection (FLS) method of comparing zero sequence transient currents in all feeders for power distribution networks. The method synthetically utilizes two algorithms. The first algorithm is to select the faulty line by comparing the transient amplitudes of zero sequence currents in the special frequency band, which is the first capacitive band and can be captured adaptively. The second FLS algorithm is by comparing the active-component amplitudes of zero sequence current in low frequency band (about 50 Hz). The proposed FLS method is tested with ATP simulation and field-recorded data, and the test results show that the synthetic method is suitable to all kinds of faults in non-solid earthed networks and works sensitively and accurately. This algorithm has been adopted in YH-B811 equipment.