122. Simulation Study of Fault Location Based on EMD Algorithm for Small Current to Ground System

In this paper, it established the single-phase to ground fault model of small current to ground system, and simulated the model, according to decomposed by EMD algorithm for transient zero-mode power signal of every detection point along the line installed. It utilized the high-frequency IMF components got to subtract backward first-order, according to analysis the differential waveforms of every detection point, it has the differential waveforms similarity degree of two detection point located the same side of fault point is higher, while the differential waveforms similarity degree of two detection point located the two sides of fault point is lower. In addition, if the fault point was center, the differential waveform symmetry of two sides of fault point is higher. Besides, it has shown that the characteristic information of first-order differential waveform was not varied by the transition resistance’s change. So it utilized the characteristic information of differential waveform to provide a new idea for fault location of small current to ground system.