Power Monitoring System for 3-Phase Electric Motors Using IoT-Based Current Transformers and Potential Transformers

This study presents the results of the IOT-based 3-phase electric motor monitoring system design in the Nickel smelting industry. Conventional measurement methods have a high level of risk and are very dangerous for field workers. The use of automatic measurement methods is considered better because the accuracy of measurement results can reach 98% with measurement data that can be well documented in the storage system. The use of voltage and current sensors in this design uses Current Transformer (CT) and Potential Transformer (PT) which are industry standard devices. The measurement signal obtained from the CT and PT components is processed using a signal conditioning circuit. Setting the AC to DC voltage in the signal conditioning circuit is the initial stage in signal management, then the results are amplified using signal amplification, which is needed to increase the accuracy of readings in the control circuit using OP-AMP amplification. The results of reading the current, voltage, and power measurement data from a 3-phase electric motor will be displayed on the HMI using the website. The measurement results are in the form of data stored in database storage to facilitate the evaluation process of daily, weekly, and even annual power usage. From these results, the power of using a 3-phase electric motor with an additional generator load of 3212, 563W is obtained. In processing the value of the current measurement results in each phase, the difference in the value of the phase current is obtained, namely 5.11A, 4.36A, 4.06A. Voltage measurements in each phase are also obtained through data processing voltages of 232.13 V, 242.03 V, 238.16 V for the R, S, and T phases. Finally, the monitoring system design this time can be implemented.