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A Directional Relay Algorithm Using Positive-Sequence Superimposed Quantity for Transmission Line Protection  

이명수 (한양대 전기공학과)
유석구 (한양대 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers A / v.52, no.4, 2003 , pp. 226-233 More about this Journal
Abstract
Directional elements are fundamental to protection scheme security and selectivity, performing such critical tasks as supervising distance elements and controlling overcurrent elements. But, conventional operating principles for directional detection based on negative or zero sequence quantify do not satisfy the requirements for improved sensitivity and fast operation under any fault conditions. In this paper, new algorithm for directional elements is proposed. The proposed algorithm use the positive-sequence superimposed voltages and currents in order to be used in all fault conditions. Also, because this algorithm uses a voltage compensation method. it can be well operated under strong source conditions.
Keywords
Transmission line protection; Directional element; Positive-sequence superimposed quantity;
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