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 on the beginning of each feeder. The Smart Grids necessity is becoming more and more a reality for the grids of tomorrow. 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 relays. These deployed relays would divide the feeder in smaller protected areas leading to shorter outage occurrence and duration for loads and producers. The proposed method was tested on all types of grids with overhead lines, cables and mixed, for all several different neutral groundings of the HV/MV transformer with or without DG presence. This method is subject to a patent deposition in 2012.