Why you use a star-delta connection?

Answer 1

A star-delta connection is used primarily to reduce the starting current and torque of three-phase induction motors. In the star configuration, the motor starts with a lower voltage, limiting the inrush current and preventing damage to the motor and electrical system. Once the motor reaches a certain speed, it is switched to the delta configuration for normal operation, allowing it to utilize full power and torque. This method enhances system efficiency and prolongs equipment life.