DocumentCode :
1419179
Title :
Distance-protection performance under conditions of single-circuit working in double-circuit transmission lines
Author :
Humpage, W.D. ; Kandil, M.S.
Author_Institution :
University of Manchester Institute of Science & Technology, Power Systems Laboratory, Department of Electrical Engineering & Electronics, Manchester, UK
Volume :
117
Issue :
4
fYear :
1970
fDate :
4/1/1970 12:00:00 AM
Firstpage :
766
Lastpage :
770
Abstract :
When double-circuit transmission lines are operated with one of the circuits isolated and earthed at both ends, relaying conditions can arise that influence the choice of the forward-reach settings of distance protection. Earth-fault conditions during single-circuit working in this way give rise to apparent-impedance values presented to the protection that are generally less, and to errors in impedance measurements that are correspondingly greater, than for the same fault conditions during normal operation, when both circuits are in service together. The paper reports computer studies which seek to compare the discriminative performance of distance protection under earth-fault conditions during double-circuit and single-circuit operation and which, in particular, provide an account of the relaying conditions likely to be encountered in single-circuit operation. Apparent impedance values and associated relaying errors are summarised in tabular form for fault and prefault conditions relevant to a typical 400 kV interconnection, on the basis of which an assessment of the discriminative performance of distance protection in single-circuit working is made.
Keywords :
relay protection; transmission networks;
fLanguage :
English
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
Publisher :
iet
ISSN :
0020-3270
Type :
jour
DOI :
10.1049/piee.1970.0148
Filename :
5248886
Link To Document :
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