Publisher : The Korean Institute of Electrical Engineers
DOI : 10.5370/JEET.2006.1.4.423
Title & Authors
Loop Selective Direction Measurement for Distance Protection Steynberg, Gustav; Koch, Geyhard;
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.