Relay Coordination in a meshed power network in highly
tedious and time consuming affair. Earlier coordination of directional overcurrent relays (DOCRs) was performed manually, which was very time consuming. The use of computer in the relay coordination has relived protection engineering from laborious calculation. If any relay fails to respond the fault it is backed by another relay. The operation of primary relay is quick and back up relay operates after a certain time margin. Overcurrent relays are used as both primary and backup protection for heavily meshed and multi-source power network. Low cost and simplicity to implement are the merits of overcurrent relay application for Power system protection [3].