Scott-T transformer

However if the two-phase load is not balanced (more power on one phase than the other), the Scott-T transformer cannot fix this.

Both 2-φ and 3-φ components coexisted for a number of years and the Scott-T transformer connection allowed them to be interconnected.

Scott-T transformer: Transformer used for phase transformation from three-phase to two-phase and vice versa.

The Scott-T transformer connection may be also be used in a back to back T to T arrangement for a three-phase to 3 phase connection.

Two-phase power may be obtained from a three-phase system (or vice versa) using an arrangement of transformers called a Scott-T transformer, invented by Charles F. Scott.