Can transformers listed in this catalog be reconnected as auto transformers to increase their KVA rating?
Several standard single phase transformers listed in this catalog can be connected as auto transformers. The KVA capacity will be greatly increased when used as an auto transformer, in comparison to the nameplate KVA as an insulating transformer. E xamples of auto transformer applications are changing 600 volts to 480 volts in either single phase or three phase; changing 480 volts to 240 volts single or three phase or vice versa; or the developing of a fourth wire (neutral) from a 480 volt three phase three wire system for obtaining 277 volts single phase. Th is voltage is normally used for operating fluorescent lamps or similar devices requiring 277 volts. For further details showing KVA and voltage combinations for various auto transformer connections refer to the Acme catalog.