IoT Star-Delta Starter for Remote Control of 3-Phase Motors

The star-delta starter is an inexpensive device to reduce the starting current of a large 3-phase motor and prevent an excessive voltage drop in the power supply. However, the starter is controlled manually or through a wired connection, and its timer for the transition from star to delta connection cannot be set remotely. This paper allows automatic control of the starter and motor; monitoring of line currents, run, stop, and trip status; protection against open connection in any of the three supply lines; and adjustment of the transition time electronically through any mobile phone or computer with a web browser using Internet of Things (IoT) technology.