Utilisation of symmetrical components in a communication-based protection for loop MV feeders with variable short-circuit power

Ciontea, Catalin Iosif and Bak, Claus Leth and Blaabjerg, Frede and Hong, Qiteng and Booth, Campbell and Madsen, Kjeld Kilsgaard (2018) Utilisation of symmetrical components in a communication-based protection for loop MV feeders with variable short-circuit power. The Journal of Engineering, 2018 (15). pp. 1245-1251.

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    Abstract

    Variability of the available short-circuit power also implies variation of the fault level, which can potentially cause several protection problems in the electric networks. In this paper, a novel protection method that is insensitive to the fault level changes caused by variable short-circuit power is presented. It relies on utilisation of symmetrical components of the short-circuit currents and on communication between the protection relays. The proposed method addresses the Single Phase to Ground (SPG) faults occurring in directly grounded distribution networks, with focus on closed-loop Medium Voltage (MV) feeders. Case studies are presented, which demonstrate that the proposed protection scheme is capable of effectively detecting the SPG faults in closed-loop feeders with variable short-circuit power