Protection of Induction Motor using Microcontroller

Three-phase induction motors are industry’s workhorses and widely used as electromechanical energy conversion devices. Although induction machines are considered relatively reliable and robust due to their simple design and well-developed manufacturing technologies, failures do occur and may severely disrupt industrial processes and even lead to disastrous accidents. To prevent these failure happen, many techniques have been developed for early condition monitoring. The computer based protection methods are costlier and the electrical parameters cannot be visualized by Programmable Logic Controller (PLC) based method. The old classical methods are complex. Hence to protect an Induction motor easily, a microcontroller based fault detection and protection of Induction motor is proposed. This paper tends to develop for protection of three phase induction motor from over voltage and under voltage, over current, over speed, temperature, Line frequency and phase failure with their sensing circuits. The proposed system is tested with the setting of various preset values of parameters. From the results, it is observed that the results are satisfactory, reliable, gives quick response, cost effective and highly versatile. Keywords— Fault, Microcontroller, Protection, Sensing Circuit and Three Phase Induction Motor.