ADVANTAGES AND DISADVANTAGES OF AUTO TRANSFORMER STARTER

ADVANTAGES OF AUTO TRANSFORMER STARTER:

a ) On the 65% tapping the line current is approximately equal tp that of a Star-Delta starter, however, at the time of switching from reduced voltage to the full supply voltage, the motor is not disconnected so that the second peak is very much reduced since the transformer is converted into reactance for a short time.

b ) It is possible to vary the tapping from 65% to 80% or even up to 90% of the supply voltage in order to ensure that the motor starts satisfactorily.

DISADVANTAGES OF AUTO TRANSFORMER STARTER:
a ) One of its great disadvantages is the limitation of its operation frequency. It is always necessary to know the operation frequency in order to determine a suitably rated auto-transformer.

b ) The compensating switch is much more expensive than a Star-Delta starter due to the auto-transformer.

c ) Due to the size of the auto-transformer starter, much larger control panels are required which increases the price.