Optimized bandpass admittance criteria for earth fault protection of MV distribution networks

Abstract This paper is concerned with the new method of earth fault detecting in MV distribution networks. The goal of investigations was to enhance protection sensitivity to low resistance faults resulting in small increase of voltage and residual currents in protected feeders. The earth fault detection criteria for three earthing methods and details of the criteria optimization algorithm are presented. The multi-option protection criteria optimization was based on relaying signals obtained from MV distribution network modelling in EMTP. The reliability of the protection algorithm for sustained and intermittent arcing earth faults is discussed.

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