Changing transformer ratio without interrupting the load

Regulating the voltage of high-voltage transmission lines is now possible by means of taps in the step-up transformers through which the ratio is changed without disconnecting the transformers from service nor interrupting the load. The methods of obtaining this result, herein described, are the results of the development of suitable ratio adjusters and a properly timed mechanism including circuit-breaking devices. The scheme is applicable to units of any size or to existing banks of transformers by the addition of a regulating auto transformer. The range of application has also been extended to include the field of electrolytic reduction and little doubt is held that this very flexible scheme of voltage regulation will fill a long felt need by many generating and distributing systems. Several installations are already in successful operation and a considerable number are now in the process of construction and operation.