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Answer Posted / deadzg_devil
Y-D starter is used in starting of IM.
The main purpose of using this topology is to reduce the starting current of IM.
As in Y the voltage will be 1/root 3 time line voltage therefore current drawn will be less as compared to in D connection.
When the IM motor attain 75% of it's rated speed at this the connection is changed to D topology to attain full speed.
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