Optimal Directional Overcurrent Relay Coordination in Interconnected Networks Considering User-Defined PWL Characteristic Curve

This paper develops a novel methodology to apply the piece-wise linear characteristic (PWLC) to coordinate the digital overcurrent relays (DOCRs) in meshed power systems regardless of their scales. In this approach, first, a table based on maximum short-circuit fault currents obtained using DIgSILENT software is produced in which the current seen by each relay is recorded by implementing a three-phase fault in front of other relays. Then, based...