Detection and Location of Earth Fault in MV Feeders Using Screen Earthing Current Measurements

Krzysztof Lowczowski, Jozef Lorenc, Jozef Zawodniak and Grzegorz Dombek
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Krzysztof Lowczowski: Institute of Electric Power Engineering, Poznan University of Technology, Piotrowo 3A, 60965 Poznan, Poland
Jozef Lorenc: Institute of Electric Power Engineering, Poznan University of Technology, Piotrowo 3A, 60965 Poznan, Poland
Jozef Zawodniak: Department of Network Asset Management, Enea Operator, Strzeszynska 58, 60479 Poznan, Poland
Grzegorz Dombek: Institute of Electric Power Engineering, Poznan University of Technology, Piotrowo 3A, 60965 Poznan, Poland

Energies, 2020, vol. 13, issue 5, 1-24

Abstract: The paper analyzes the utilization of cable screen currents for earth fault identification and location. Attention is paid on cable and mixed feeders—cable and overhead lines. The principle of operation is based on utilization of 3 criterion values: Ratio of cable screen earthing current and zero sequence cable core current— RF 110/15 , phase shift between cable screen earthing current and zero sequence cable core current— α and cable screen admittance defined as a ratio of cable screen earthing current and zero sequence voltage— Y 0 cs . Earth fault location is possible thanks to discovered relation between RF 110/15 and α , whereas Y 0 cs allows for reliable detection of earth faults. Detection and identification are very important because it allows to increase the reliability of supply—reduce downtime and number of consumers affected by the fault. The article presents a phase to ground fault current flow for different power system configurations. At the end solution, which improves location capabilities is proposed. The solution is analyzed in PSCAD software and verified by network experiment.

Keywords: cable screen; earthing system distribution feeder; mixed cable-overhead line; protection relay; fault location; fault detection (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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