Multi-functional Relay for Enhanced Power System Security

The ongoing enhancement of modern power systems has led to the development of composite interconnected networks. This project focuses on the modeling and implementation of a versatile relay that provides protection for multiple components, including over-current, over-voltage, and under-voltage scenarios. By modelling the proposed system, any possible issues, such as malfunction and incompatibility, can be examined. The multifunctional relay works or operates also as a directional relay. The whole research and implementation are performed through the simulation using MATLAB/Simulink and outputs are verified for different types of loads. In this platform, a separate subsystem is created as multifunctional relay; it comprises of three relays namely over-voltage relay, under-voltage relay and overcurrent relay. The output obtained from the multifunctional relay will be provided to circuit breaker and it has been performed under two scenarios, under two different loads such as resistive load and inductive load. A specific appropriate limit are provided for all the different relays in which only in those ranges the circuit breaker will act upon and performs a tripping condition.