Reason of starting a motor in star and then in delta

Star gives initial low voltage
Reason:

Star connection contains 3 phase wires and one neutral wire. And it gives phase to neutral voltage of 220V.

       
Delta gives high voltage

Reason:
Delta connection contains 3 phase wires only. And it gives phase to phase voltage of 330V.

Advantage:
Supplying high voltage initially will burn the motor and puncture all the wires.

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Posted in: Engineering Knowledge, Knowledge