Determination of the Place of Short-Circuit on Power Lines with a Simultaneous Rupture of a Phase

The methods of determining fault locations on transmission lines in networks with earthed neutral using the instantaneous values of industrial frequency parameters are considered. The algorithm of a one-way method of determining the location of one-phase open fault in transmission line is proposed based on processing of instantaneous currents and voltages. For sampling intervals of 0.5 to 0.625 ms, the measurement time will not exceed 2.5 ms. During this time, there will be no saturation of the coil flux guide of the current transformers, i.e., the relay protection receives undistorted information. The algorithm is applicable for cases when phase discontinuities are accompanied by a short-circuit.