Single-phase Grounding Fault Location Technology Based on Edge Calculation of Fault Components of the Positive-sequence Current

In the one-phase-to-ground fault of the distribution network, due to the difference in the distribution of the positive sequence current constituents of each line, the information contained in the fault path and the non-fault path also has a certain difference. On this basis, the edge of the fault constituent in the positive sequence current is used to locate the one-phase grounding. The method first uses phase current subtraction to multiply the period difference before and after the fault, and then uses the inverse transformation before and after the fault to determine the positive and null sequence constituents of the fault. Symmetrical composition. By analysing the amplitudes of the positive sequence and null sequence currents of the three-phase fault constituents, and according to the corresponding relationship between the amplitudes and the adaptive threshold, the location of the fault section is realized. A specific fault point location criterion and steps are given in this paper, and it is verified by ATP simulation software.