What is means by star delta. And how it is work

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Star delta is a method of starting three-phase motors with reduced voltage.

It involves connecting the motor windings in a star configuration during starting and then switching to a delta configuration once the motor is up to speed.
This reduces the starting current and torque, which can be useful for large motors or when the power supply is limited.
For example, a 30 kW motor might draw 60 amps at full voltage, but only 35 amps when started in star delta mode.
The switch between star and delta is typically done using a special starter or contactor.
Star delta starting is not suitable for all types of loads, and can result in reduced efficiency or increased wear in some cases.

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