The two transformers are connected electrically but not magnetically. It is is type of circuit used to derive two-phase. NPTEL provides E-learning through online Web and Video courses various streams.
There are two main reasons for the need to transform from three phases to two phases, 1. Debaprasad Kastha, Department of Electrical Engineering, IIT Kharagpur.

Two transformers are used in this type of connection.

One of the transformers has centre taps on both primary and secondary windings (which is called as main transformer ).

The other transormer is called as teaser transformer. Bhagwaan Shree Ram HOD EEE Dept SVCE. Connection diagram and operation . For the secondary side loads of the . HE standard Off-The-Shelf three-phase machine is extensively used as it can be directly fed from the three- phase mains or via three-phase .
















