Design and Implementation of an Automatic Electrical Motor Protection

The purpose of this paper was to design and implement an automatic motor protection system prototype. The system designed made use of sensors to measure and provide protection to the motors against temperature, overcurrent, overvoltage and under voltage using an arduino as the controller. Units to monitor temperature, overcurrent, overvoltage and under-voltages were designed and integrated. The temperature and current tolerance of the motor were set at 50ºC and 0.26A respectively. The system could respond accordingly to temperature and current changes by way of stopping the motor when set conditions were exceeded. The data measured was stored on a memory card and could be retrieved at any time to analyse the induction motor behaviour. The system if incorporated on motors, could minimize potential damages to electric motors’ windings, hence reducing electric motor maintenance costs for companies.