Relay coordination and selection of breaker: Example of Ihsaniye)

In this research, it is focused on the prevention of unneccessarily energy interruptions and less making a loss to the company selling energy through relay coordination by terminating fault in the source. In calculations made, with this application, it can have an idea that how much profit to gain and how much load not to be energized. With this application, it is aimed that people's equipments operated electrically are less damaged in case of continuously cutting of energy and the energy selling company goes through less harmlessly. It is also aimed better protection of the line in phase-phase and phaseearth faults that may occur with coordination made. Keywords: Relay, Relay Coordination, Breaker