Open AccessA Numerical Relay Implementation for Overcurrent Protection Based on ARM Cortex – M4 Microprocessor
Author(s) -
Anh Vũ Nguyễn,
Lien B. Nguyen,
Anh Hoang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/752/1/012005
Subject(s) - overcurrent , relay , digital protective relay , microcontroller , microprocessor , power system protection , computer science , protective relay , power (physics) , electric power system , electrical engineering , electronic engineering , engineering , current (fluid) , physics , quantum mechanics
Numerical overcurrent protection relays are the most extensively used devices to safeguard the power system from detrimental faults which might lead to a catastrophe. This paper presents a practical implementation of a numerical overcurrent protection relay based on ARM Cortex – M4 microcontroller embedded with a floating-point unit which has ability to perform complex calculation operations with a great accuracy for real-time protection algorithms. In order to implement, the system is designed to capture analog values of input currents by using Hall current sensors, analog conditioning circuits and 12 – bit A/D converters. Based on the measured input current values, a real-time signal processing algorithm for overcurrent protection is applied to produce an inverse - time characteristic according to the IEEE Standard C37.112-1996. The experimental results demonstrate that our numerical relay produces great performances in the real-time and has ability to protect electrical components from exceeded current faults satisfying the IEEE standard for overcurrent relays.