Questions & Answers of Three Phase Transformers – Connections

In a constant V/f induction motor drive, the slip at the maximum torque

The starting line current of a 415 V, 3-phase, delta connected induction motor is 120 A, when the rated voltage is applied to its stator winding. The starting line current at a reduced voltage of 110 V, in ampere, is _________.

The figure above shows coils 1 and 2, with dot markings as shown, having 4000 and 6000 turns respectively. Both coils have a rated current of 25 A. Coil 1 is excited with single phase, 400 V, 50 Hz supply

The coils are to be connected to obtain a single phase, 400/1000 V, auto transformer to drive a load of 10kVA. Which of the options given should be exercised to realize the required auto transformer?

The figure above shows coils 1 and 2, with dot markings as shown, having 4000 and 6000 turns respectively. Both coils have a rated current of 25 A. Coil 1 is excited with single phase, 400 V, 50 Hz supply

In the autotransformer obtained in Question 57, the current in each coil is