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A New Algorithm for Digital Impedance Relays | IEEE Journals & Magazine | IEEE Xplore

A New Algorithm for Digital Impedance Relays


Abstract:

This paper presents a new algorithm suitable for calculating impedances from digitized voltages and currents sampled at a relay location. Each input is assumed to be comp...Show More

Abstract:

This paper presents a new algorithm suitable for calculating impedances from digitized voltages and currents sampled at a relay location. Each input is assumed to be composed of a decaying d.c. component and components of the fundamental and harmonic frequencies. Parameters of a digital filter determined by using the least error squares approach are then used to compute the real and imaginary components of the voltage and current phasors. Impedances as seen from a relay location are then calculated. The proposed algorithm was tested using the fault data recorded at the Regina South switching station of the Saskatchewan Power Corporation; some of the test results are included.
Published in: IEEE Transactions on Power Apparatus and Systems ( Volume: PAS-98, Issue: 6, November 1979)
Page(s): 2232 - 2240
Date of Publication: 26 February 2007
Print ISSN: 0018-9510

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