Patent ID: 7298149
Filing Date: 2007-11-20
Classification: G01R,H02H

Abstract:
1. A method to locate a fault from one end of a section of a power line by means of measurements of current, voltage and angles between the phases at a first end of said section, the method comprising: calculating symmetrical components of currents for said current and voltage measurement at said first end, calculating a value of impedance for an extra link between the terminals with the impedance for the positive sequence equal to: Z 1AB =impedance for the positive sequence of the extra link, Z 1LA =positive-sequence impedance of the healthy line, determining a compensation for the shunt capacitance with the aid of an equation of the form: determining the zero-sequence current from the healthy line of a section of parallel power lines, calculating a distance to a fault for the parallel line section, calculating the distance to the fault from said first end using a quadratic equation of the form: locating the fault utilizing the calculated distances.