Future-Proof MV Distribution Network Short-Circuit Protection Scheme

Hannu Jaakko Johannes Laaksonen

doi:10.15866/iree.v10i1.5100

Future-Proof MV Distribution Network Short-Circuit Protection Scheme

Hannu Jaakko Johannes Laaksonen^(1*)

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/iree.v10i1.5100

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.
Copyright © 2015 Praise Worthy Prize - All rights reserved.

Keywords

Protection; Smart Grids; Grid Codes; Low-Voltage-Ride-Through; Fault-Ride-Through; Islanding; Distributed Generation

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References

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