Javad RAHEBI, Muhanned Mahmood Shakir AL-SHALAH

Design, Modeling and Implementation of Multi-Function Protective Relay with Digital Logic Algorithm

In this paper, three phase transmission power system with three different protective schemes such as over current relay, over and undervoltage relay and over and under frequency relay is developed using MATLAB/Simulink toolbox. The protective relay is tested fordifferent operating conditions of the transmission power system such as overload, over and under voltage, over and under frequencyconditions. Protective relays are explained with simple flowcharts. We used digital logic algorithm for implementation of protectiverelay. In this paper, a digital multi-function protective relay was designed and implemented on MATLAB/Simulink. In this study wealso explore some current techniques ranging from the use of digital logic algorithms to system protection applications. Mother powersystem protective relays are digital systems based on digital signal processing of power system voltage and current waveforms.

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