How does the wye delta starter works?

A wye-delta starter is an electrical control method used to reduce the starting current of a three-phase induction motor. Initially, the motor is connected in a wye (Y) configuration, which reduces the voltage across each winding to about 58% of the line voltage, thereby limiting the inrush current. After a preset time, the starter switches the motor to a delta (Δ) configuration, allowing it to run at full voltage and speed. This transition helps protect the motor and electrical system from damage due to high starting currents.