Laboratory investigation of an amplitude comparator based directional comparison digital protection scheme

Author

Prakash, K.S. ; Malik, O.P. ; Hope, G.S. ; Hancock, G.C. ; Wong, Kenneth K.Y. ; Wong, K.K.

Author_Institution

Dept. of Electr. Eng., Calgary Univ., Alta., Canada

Volume

5

Issue

4

fYear

1990

fDate

10/1/1990 12:00:00 AM

Firstpage

1687

Lastpage

1694

Abstract

A directional comparison digital protection scheme has been implemented with a 16-b single-board computer at each end of a physical model of a transmission line, with communication between the two ends. The protection algorithm makes use of the fundamental frequency components of the deviation signals of the voltage and phase-shifted current. Software routines have been developed for fault monitoring, directional determination, and the trip/block decision. Graphics features incorporated in the software are explained. Tests for various faults conducted on the physical model of a double-circuit transmission line show that the direction to a fault is determined in 3 to 7 ms. The blocking features of the relay are demonstrated

Keywords

power engineering computing; power system protection; amplitude comparator; directional comparison digital protection scheme; double-circuit transmission line; fault monitoring; faults; phase-shifted current; single-board computer; trip/block decision; Computerized monitoring; Frequency; Graphics; Laboratories; Physics computing; Protection; Relays; Testing; Transmission lines; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.103663

Filename

103663