Disadvantages of Star Delta Converter

1.Low starting torque,only 33% starting torque

2.Break in supply - Possible transients

3.Six terminal motor requires

4.The delta of motor is transformed in starter and not on motor terminals

5.Applications with a load torque higher than 50% of the motor rated torque will not be able to start using the star-delta starter

6.Low Starting Torque - Reduction of the line voltage by a factor of 57.7% to the motor and the current is reduced to 1/3 of the current at the full voltage,but the starting torque is also reduced 1/3 to 1/5 of DOL starting torque.