Abstract
Short-circuit protection operation time delays in medium-voltage (MV) networks have traditionally been dependent on fault-current magnitude or measured impedance with fixed time delays or inverse time curves. However, MV feeder protection selectivity issues with low-voltage-ride-through (LVRT) curves of distributed generation (DG) units and possibility of intended island operation must be considered increasingly in the future as a part of the protection scheme. Therefore, this paper proposes a future-proof, directional short-circuit protection scheme for Smart Grids. The proposed scheme enables the definition of LVRT curve compatible protection operation time delays during normal, grid connected operation for protection relays in MV distribution network having multiple protection zones without use of high-speed communication based interlockings/blockings between relays.
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