Patent ID: 7692523

Claim:
A multi-voltage autotransformer for interconnecting different high voltage power transmission systems comprising: a series winding and a common winding both around a core; a high voltage output terminal; a low voltage output terminal; a plurality of taps positioned along the series winding configured to selectably establish electrical connections between the series winding and at least one of the high voltage output terminal and the low voltage output terminal, and at least one additional tap positioned along the common winding configured to selectably establish an electrical connection between the common winding and at least one of the low voltage output terminal and a neutral output terminal, the plurality of taps and at least one additional tap configured so that any two of a plurality of different high voltage power transmission systems can be interconnected by the autotransformer; and a housing that holds the series winding, the common winding, the core and at least a portion of a cooling system; wherein the housing is sized within a maximum dimension that is suitable for rail transport in a desired geographic area, and wherein the transformer has a power rating of at least about 100 MVA and an output voltage of at least about 69 kV.