Protection of Three Phase Induction Motor Using Embedded System

Abstract

This paper present a PIC microcontroller – based control system for the protection of a three phase induction motor. The use of microcontroller technology has enabled the design of energy efficient and cost effective reliable control systems for induction motors. Fault types of induction motor like unbalanced voltage, over voltage, under voltage, over current, phase failure, over heat and more considered in this work. Fault monitoring and diagnosis are performed using protest environment. Fault classification is achieved through the microcontroller which includes a program for fault classification. When the fault occurs, the microcontroller sends a signal to the interfaced digital relay to trip the motor circuit and another signal to an LCD to display the type of fault. The use of microcontroller reduce the response time of the protection system and make it more suitable for real time operation. The proposed protection scheme is simulated using MATLAB Simulink. MATLAB simulation results show that the well trained protest scheme is able to detect all types of internal faults at different locations. The microcontroller used in this work is the high performance enhanced flash PIC16F877A Microcontroller of microchip which has an on chip analogue to digital converter peripheral, among other features. Keywords: PIC microcontroller, three phase induction motor, fault classification, Proteus environment.