Directional Protection Scheme in Distribution Feeders with Distributed Generation

The integration of new sources of electricity generation to the General Distribution Networks (GDN), have resulted in topological changes in the system, such as the change of direction of current flows, resulting in bidirectional flows, likewise, requirements have been set that must be met when distributed generation units (DG) are connected to distribution systems, one of them is the ability for the unit (DG) to remain connected when a fault occurs. The traditional protection schemes that are operating in radial distribution networks tend to not operate correctly with the presence of (DG) units, since they cannot to detect or isolate the fault or may operate outside their area of operation. For this reason, it is important to make changes in the protection schemes, which is why a more selective protection is necessary. This paper proposes a protection scheme capable of identifying the magnitude of the fault by means of directional relays in the presence of distributed generation that are designed in the ATP/EMTP software.