Under/Over Voltage Relay Berbasis Mikrokontroler Atmega328

Abstract

Quality of power supply system in an electrical circuit is needed. Poor quality power supply may cause distraction and may even damage the system hardware/ electrical circuit. One form of the disorder is the under/over voltage. To overcome this we need a protection device that can detect the presence of interference under/over voltage and secure the electrical equipment. Under/over voltage relay based microcontroller ATmega328 is designed aiming to detect the disorder under/over voltage on voltage single phase 220 V 50 Hz. Voltage limits for nuisance under voltage is -5% of normal voltage (220V), whereas disruption over voltage is +5% of the normal voltage. and delay settings for under / over voltage is 5 seconds. The output of the relay is connected to the contactor, the contactor will disconnect the power supply in case of disturbances under/over voltage. From the results of tests performed, the relay under/over voltage ATmega328 microcontroller-based designed to work properly. Relay can detect disturbances under voltage and over voltage -5% +5% of nominal voltage