Micro-controller based over current relay using Hall Effect current sensor

Abstract

This project is to design IDMT (Inverse Definite Minimum Time) Over current Relay using Arduino. The relay can be used to sense faults in transmission line based on analog to digital conversion of the 3-phase current and when a current in a part of a power system exceeds a pre-set value either due to a fault or a large overload, the relay will isolate the part through sending trip signal to a circuit breaker. The main features which have encouraged the design and development of Arduino based protective relays are their economy, compactness, reliability, flexibility and improved performance over conventional relays.