Protection scheme based on non communicating relays deployed on MV distribution grid

This work is related to protection systems on MV distribution networks. Most of these grids are currently protected by a single relay installed at the beginning of each feeder. The Smart Grids transition is more and more essential for the future grids willing to attain a higher reliability, accessibility and enhance a sustainable development of the society. These more complex grids with Distributed Generation (DG) interconnection could require a more complex protection system to achieve high quality service and enhance the grid stability. This work proposes non communicating, distributed distance protective relays for MV radial networks. These deployed relays would divide the feeder in smaller protected areas leading to shorter outage occurrence and duration for loads and producers. The system would also benefit of a communications free protection scheme, making it more reliable thanks to the independency of the relays. The proposed method was tested on most types of grids with overhead lines, cables and a mix of both, for several different neutral groundings of the HV/MV substation and with or without DG existence.