A probabilistic method for detection and location of very high resistive earth faults

A probabilistic method is presented for the detection and location of very high resistive, permanent single-phase earth faults in medium voltage, radi al operated distribution networks (20 kV). The systems considered have an u nearthed or a compensated neutral and the fault resistances covered are in the range 5-220 k Omega. The algorithms of the method are based on the chan ge of the neutral-voltage and zero-sequence currents, measured at the MV su bstation and also at the distribution line locations. The feasibility of th e method was verified by an analysis based on system data recorded during f ield tests in real power systems. (C) 2000 Elsevier Science S.A. All rights reserved.