Improving the Efficiency of Earth Fault Detection by Fault Current Passage Indicators in Medium-Voltage Compensated Overhead Networks

Bartosz Olejnik () and Beata Zięba
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Bartosz Olejnik: Faculty of Environmental Engineering and Energy, Institute of Electric Power Engineering, Poznan University of Technology, Piotrowo Street 5, 60-965 Poznan, Poland
Beata Zięba: Faculty of Computer, Electrical and Control Engineering, Institute of Automation, Electronics and Electrical Engineering, University of Zielona Gora, Z. Szafrana Street 2, 65-516 Zielona Gora, Poland

Energies, 2022, vol. 15, issue 23, 1-19

Abstract: The article presents a method for detecting earth faults in a compensated medium-voltage network, which can be used especially in fault current passage indicators, but also in standard protection devices. The method is based on the adaptation process of the zero-sequence current protection setting, with the adaptation factor depending on the current value of the zero-sequence voltage. In this article, a comparative analysis of the classical and adaptive zero-sequence current criterion is conducted, taking into account the errors of the measuring system. The results of simulations performed in the PSCad environment are also presented. For a representative set of example short circuits, it was shown that the effectiveness of the presented criterion can be more than 50% higher than that of the standard criteria, taking into account the range of detected transition resistances. A comparison of the proposed method with admittance criteria was also drawn, and it was shown that it is suitable for the detection of high-resistance earth faults.

Keywords: earth fault detection; fault current passage indicator; compensated MV network; efficiency improving; high-resistance fault (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: 2022
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