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WHY 6.6KV MOTORS ARE STAR CONNECTED AND WHY NOT DELTA CONNECTED,
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Answer Posted / mayur
FOLLOWING MAY BE THE REASON.
1. REDUCE THE STARTING CURRENT
JUST LIKE STAR / DELTA STARTER USED FOR CERTAIN MOTORS TO REDUCE THE STARTING CURRENT. THE APPLIED VOLTAGE ACROSS THE WINDING IN CASE OF DELTA CONNECTED MOTOR IS 1.73 TIMES THE STAR CONNECTED MOTOR. HENCE IN STAR CONNECTED MOTOR THERE IS A REDUCED VOLTAGE STARTING. SUBSEQUENTLY CURRENT IS ALSO REDUCED, HOWEVER THERE IS A SMALL EFFECT ON THE STARTING TORQUE SINCE TORQUE IS PROPORTIONAL TO SQUARE OF THE CURRENT WHICH MAY BE ACCEPTABLE.
ALSO SINCE LESS VOLTAGE IS APPLIED, THE INSULATION REQUIRED FOR HT MOTORS MAY ALSO REDUCE LEADING TO COST SAVING.
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