Modelling and Implementation of Microprocessor Based Numerical Relay for Protection Against Over/Under Current,Over/Under Voltage

摘要

This paper includes the design and implementation of Numerical Relay that can protect the equipment against over-voltage, over-current and under voltage. Although, every power system is subjected to faults and these faults can severe damage to the power system. Therefore, it is necessary to observe and resolve in time to avoid a large damage such as blackouts. For this purpose, there should be some sensing devices, which give signals to the circuit breakers for preventing of power system damages. The multipurpose relays have much importance role in power system for sensing and measuring the amplitude of faults. Numerical relay provides settings of over-current, over-voltage and under voltage values. Simulations have been carried out using Proteus software along with tested on hardware with Arduino Uno Microcontroller that proves the working and operation of numerical relay.