Rectifier Transformers

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Two-phase motors draw constant power, just as three-phase motors do, so a balanced two-phase load is converted to a balanced three-phase load. However if a two-phase load is not balanced (more power drawn from one phase than the other), no arrangement of transformers (including the Scott-T transformers) can restore balance: Unbalanced current on the two-phase side causes unbalanced current on the three-phase side. Since the typical two-phase load was a motor, the current in the two phases was presumed inherently equal during the Scott-T development.

In modern times people have tried to revive the Scott connection as a way to power single-phase electric railways from three-phase Utility supplies. This will not result in balanced current on the three-phase side, as it is unlikely that two different railway sections, each connected as two-phase, will at all times conform to the Scott presumption of being equal. The instantaneous difference in loading on the two sections will be seen as an imbalance in the three-phase supply, there is no way to smooth it out with transformers.

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