DocumentCode :
1429938
Title :
Summary: Comparative performance of amplitude-comparator pilot-wire differential-protection systems
Author :
Gray, C.B.
Author_Institution :
University of Bradford, School of Electrical & Electronic Engineering, Bradford, UK
Volume :
121
Issue :
10
fYear :
1974
fDate :
10/1/1974 12:00:00 AM
Firstpage :
1180
Lastpage :
1182
Abstract :
A new relay circuit, applicable to asymmetrical pilot circuits, is described. In the steady state for relays at both ends, the circuit provides identical unit-diameter circular stability areas on the complex plane, centred on (1, 0), and it is suggested that this relay circuit constitutes a preferred characteristic of marginal operation. Certain alternative relay configurations are compared, to ascertain relative susceptibilities to the effects of induced interference voltages and the presence of d.c. components in the relaying quantities derived from the protected system. Homogeneous pilot circuits are assumed for simplicity, and the relay schemes considered include: (i) that referred to above which provides the preferred relay characteristic (ii) that which provides termination of the pilot circuit in characteristic impedance (iii) that which provides compensation for pilot-circuit phase-shift and a self-inverse characteristic.
Keywords :
power system protection; relay protection; asymmetrical pilot circuits; power system protection; relay protection;
fLanguage :
English
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
Publisher :
iet
ISSN :
0020-3270
Type :
jour
DOI :
10.1049/piee.1974.0269
Filename :
5251038
Link To Document :
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