Amplitude comparator based algorithm for directional comparisonprotection of transmission lines |
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Authors: | Prakash K.S. Malik O.P. Hope G.S. |
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Affiliation: | Dept. of Electr. Eng., Calgary Univ., Alta.; |
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Abstract: | A high-speed directional comparison relay based on an evaluation of the locally measured deviations of the voltage and the phase-shifted current from their prefault values is described. The operation of the relay depends on the power frequency components of the voltage and phase-shifted current deviation signals. The direction to a fault is determined by an amplitude comparator technique which compares a discriminant value with a positive or negative threshold. Simulation studies on a three-phase power system model show that the direction to a fault is determined within the first few milliseconds following the inception of a fault. Studies over a wide range of faults and source impedance angles show that the proposed amplitude comparator technique performs better than an analogous phase comparator technique |
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