Characterization of phase and amplitude comparators in UHS directional relays

Author

Benmouyal, Gabriel ; Chano, Simon

Author_Institution

IREQ, Varennes, Que., Canada

Volume

12

Issue

2

fYear

1997

fDate

5/1/1997 12:00:00 AM

Firstpage

646

Lastpage

653

Abstract

In this paper, conventional techniques to compute the phase angle between a voltage and a current waveform are applied to assess the directionality as it is necessary in ultra high speed (UHS) directional relays. It is shown that with this type of relay the main difficulty stems from the fact that in order to compute the angle, a prior knowledge of the amplitudes of the superimposed voltage and current magnitudes is necessary. Therefore very fast algorithms have to be devised that would take into account anticipated values of these magnitudes in order to assure secure trips in the shortest possible time

Keywords

electric impedance; phase comparators; power system protection; relay protection; DC offset effects suppression; UHS directional relays; amplitude comparators; current waveform; digital relaying; fault; incremental impedance; phase angle; phase comparators; power systems; protective relays; superimposed current magnitude; superimposed voltage magnitude; ultra high speed directional relays; very fast algorithms; voltage waveform; Circuit faults; Digital relays; Electrical fault detection; Fault detection; Impedance; Power system relaying; Protection; Protective relaying; Timing; Voltage;

fLanguage

English

Journal_Title

Power Systems, IEEE Transactions on

Publisher

ieee

ISSN

0885-8950

Type

jour

DOI

10.1109/59.589632

Filename

589632