Simulation and Hardware Implementation of Over-current Relay Used for Transmission Lines

Power system has been equip with different protection relays and over-current relay is one of them. Overcurrent relay protection can be give facile and in economical-price protection. Perhaps it reason that over-current relay could be enforced in motor, generator, transformer, distribution and transmission line, etc. When the fault current of system exceeds the pre-define limit, it will give trip signal to circuit breaker. This paper deals with IDMT (Inverse definite Minimum Time) relay through the medium like MATLAB/Simulink simulation. In MATLAB simulation single phase-ground fault is take as a fault for testing the relay sub-system. Also this paper represent the prototype model of over current relay using Arduino UNO serving as micro-controller. Arduino Uno micro-controller gives cheap, economical, and accurate protection scheme, which is why Arduino UNO has been chosen for designing prototype. Also now-a-days in power system microcontroller based relay is very succeed and prevalent.