Two-Terminal Algorithm Analysis for Unsymmetrical Fault Location on 110 kV Lines

Zuzana Bukvisova, Jaroslava Orsagova, David Topolanek and Petr Toman
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Zuzana Bukvisova: Department of Electrical Power Engineering, Brno University of Technology, Technicka 12, 61600 Brno, Czech Republic
Jaroslava Orsagova: Department of Electrical Power Engineering, Brno University of Technology, Technicka 12, 61600 Brno, Czech Republic
David Topolanek: Department of Electrical Power Engineering, Brno University of Technology, Technicka 12, 61600 Brno, Czech Republic
Petr Toman: Department of Electrical Power Engineering, Brno University of Technology, Technicka 12, 61600 Brno, Czech Republic

Energies, 2019, vol. 12, issue 7, 1-14

Abstract: This work analyses a two-terminal algorithm designed to locate unsymmetrical faults on 110 kV power transmission lines. The algorithm processes synchronized voltage and current data obtained from both ends of the protected transmission line and calculates the distance of the fault. It is based on decomposing the equivalent circuit into the positive-, negative- and zero-sequence components and finding the point where the output voltages of the right and the left side of the transmission line are equal. Compared to the conventional distance relay locator, the accuracy of this method is higher and less influenced by the fault resistance, the parallel-operated line effect and line asymmetry, as discussed in this work. It is, however, very sensitive to the synchronization accuracy. The mathematical model of the power system was created in the PSCAD (Power Systems Computer Aided Design) environment and the computational algorithm was implemented in Mathematica software.

Keywords: unsymmetrical fault location; two-terminal algorithm; sequence components (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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