Machine Parts

Since most single phase transformers have a secondary voltage of 120/240, they will be operated as a three wire system. Care must be taken in properly distributing the load as the transformer secondary consists of 2 separate 120 volt windings. Each 120 volt winding is rated at one-half the name plate KVA rating. For example: A 10 KVA transformer, 120/240 volt secondary is to service an 8 KVA load at 240 volts and two 1 KVA loads at 120 volts each. If the incorrect method is used, winding A will be loaded at 6 KVA, and winding B will be loaded at 4 KVA. These do total 10 KVA but since each winding is only rated at 5 KVA (1/2 of nameplate rating), we have an overloaded transformer and a certain failure. 

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.