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Loop Selective Direction Measurement for Distance Protection
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 Title & Authors
Loop Selective Direction Measurement for Distance Protection
Steynberg, Gustav; Koch, Geyhard;
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 Abstract
Distance relays achieve selective tripping by measurement of all short circuit fault conditions inside set reaches. The direction of the fault, forward or reverse is commonly determined with a dedicated measurement to ensure selectivity under all conditions. For the direction decision (measurement) a number of alternatives are available. This paper describes a loop selective direction measurement and illustrates by means of a typical fault why this is superior to a non loop selective direction measurement such as that based on negative sequence quantities.
 Keywords
Distance protection;Direction measurement;Polarization;Memory voltage;Faulted loop voltage;Negative sequence;
 Language
English
 Cited by
 References
1.
G. Ziegler, Numerical Distance Protection. Erlangen:Publicis-MCD-Verl., 1999

2.
Siemens, SIPROTEC 7SA522 V4.3 Manual