Testing of algorithms for a stand-alone digital relay for power transformers

Author

Rahman, M.A. ; So, B. ; Zaman, M.R. ; Hoque, M.A.

Author_Institution

Fac. of Eng. & Appl. Sci., Memorial Univ. of Newfoundland, St. John´´s, Nfld., Canada

Volume

13

Issue

2

fYear

1998

fDate

4/1/1998 12:00:00 AM

Firstpage

374

Lastpage

385

Abstract

A stand-alone digital relay has been designed and implemented. The relay can be modified easily to accommodate the protection of different types of transformers by changing the software only. Presented in this paper are the real-time experimental results of five selected algorithms implemented using this digital relay. These algorithms are: discrete Fourier transform, Walsh function, rectangular transform, finite impulse response and least-square. Based on the experimental results, the discrete Fourier transform (DFT) algorithm is found to be the best algorithm in terms of accuracy and speed for digital implementation of the differential relay for power transformers

Keywords

FIR filters; Walsh functions; discrete Fourier transforms; least squares approximations; microcomputer applications; power engineering computing; power transformer protection; relay protection; Walsh function algorithm; algorithms testing; differential relay; discrete Fourier transform algorithm; finite impulse response algorithm; least-square algorithm; microprocessor based relay; power transformers protection; rectangular transform algorithm; software change; stand-alone digital relay; Digital relays; Discrete Fourier transforms; Finite impulse response filter; Hardware; Microprocessors; Power transformers; Protection; Software algorithms; Solid state circuits; Testing;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.660904

Filename

660904