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Published Article / I07/91/P-443 ENY-ARTICLE-2008-057

Digital Line Differential Protection Using Symmetrical Components

Lobos, T (Wroclaw University of Technology)


Abstract: A new method for digital line differential protection is presented. The protection compares the time function and the orthogonal function of the symmetrical positive- sequence component at the input and output of a transmission line. From these values the magnitude of the differential current is evaluated. The time function is calculated according to the SD4c algorithm and the orthogonal function according to the SD4s algorithm from four sampled triplets. The first results of the investigation are shown. By using this method, a phase-independent operating time of less than half a period can be obtained.

Keyword(s): digital line protection ; differential protection ; symmetrical components
Note: Elect. Power Syst. Res. 1991 Vol. 22 No. 2 pp. 85-89

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Record created 2008-03-14, last modified 2008-03-14

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