Performance evaluation of digital filters used for distance relaying

Author

Soliman, S.A. ; Christensen, G.S. ; Fouda, S.

Author_Institution

Electr. Power & Machines Dept., Ain Shams Univ., Cairo, Egypt

fYear

1990

fDate

12-14 Aug 1990

Firstpage

437

Abstract

To attenuate the postfault waveforms of the voltage and current from high frequency harmonics, a low pass digital filter is used. Accordingly, these low pass digital filters become an integral part of the relay operation. A discussion is presented of the design and operation of these digital filters. Effects of the filter order and the filter time delay on the estimation of the fault location for a three phase symmetrical short circuit are also discussed. Numerical results for a 4th, 8th and 10th order digital filter, when least error squares (LS) and least absolute value (LAV) parameter estimation techniques are used to estimate fault location, are reported and form the basis of the authors conclusions

Keywords

digital filters; fault location; relay protection; digital filters; distance relaying; fault location; filter order; filter time delay; high frequency harmonics; least absolute value; least error squares; low-pass filters; parameter estimation techniques; postfault waveforms; three phase symmetrical short circuit; Circuits; Delay effects; Delay estimation; Digital filters; Digital relays; Fault location; Frequency; Phase estimation; Power harmonic filters; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1990., Proceedings of the 33rd Midwest Symposium on

Conference_Location

Calgary, Alta.

Print_ISBN

0-7803-0081-5

Type

conf

DOI

10.1109/MWSCAS.1990.140748

Filename

140748