An IoT-Based Non-Intrusive Temperature Monitoring System for Star-Delta Controlled Three-Phase Induction Motor

Overheating have been attributed to the primary problem of continuous running induction motor in the industry. Star-delta control panels are equipped with protection devices against overcurrent and under/over-voltage but are not sufficient for protection against other temperature-producing fault conditions. This study aims to develop and integrate an IoT-based non-intrusive temperature monitoring and control system into a three-phase 30 h.p induction motor controlled by a star-delta panel. A two-stage temperature threshold limit for monitoring and control was setup at 45 0 C, 60 0 C below the 85 0 C maximum operating temperature rating on the motor nameplate. The data entry collected for the two stages are 314 and 88 data points respectively. The results obtained for the two-stage setup showed that the normal operating temperature range between 30 0 C to 40 0 C for most of the operating time duration of the induction motor. Temperature anomalies of 45.5 0 C and 85 0 C were recorded for the first and second stage setup respectively. Shutdown of the induction motor was recorded for the first stage but not for the second stage which shows that the designed system responds differently to gradual and sudden temperature increase.