General Electric Company

Walter J Pasko

Robert H Ettinger

Alfons M Wiater

William H Rathbun

Nicholas L Paternoster

Power Transformer cores are assembled by inserting a plurality of lamination inserts between the upper yoke laminations and the leg laminations in the transformer core assembly process. The arrangement allows the upper yoke to be readily removed for inserting the transformer windings over the core legs. The upper yoke is then reassembled with the inserts reinserted to complete the transformer core.

Methods for assembling a transformer core

Transformer cores are made electrically conductive during impulse voltage condition when a certain voltage is attained by a coating of semiconductor material applied to the edges or surface of the core laminations. Under ordinary operating conditions the semiconductor material provides a high resistance path to charges in the core. Upon the occurrence of a high voltage impulse, the semiconductor material rapidly equalizes the charges in the laminations and so avoids the danger of breakdown of the insulating coatings between individual laminations.

Transformer core having charge dissipation facility

A sound attenuator for transformers comprises a rigid plate fixedly attached to a resilient mass. The sound attenuator is attached to the transformer outer wall in the vicinity of highest sound production. The characteristics of the metal plate and the resilient mass are chosen to produce acoustical radiation out of phase with the noise emitted at the transformer wall surface.

Resonant sound attenuator for transformers

A noise suppressor for a heat exchanger comprises an air duct having a larger inlet than outlet encompassing the cooling fan to provide an antiresonant space to incoming air. The noise suppressor effectively reduces the noise level emanating from supplementary air-cooled transformers mounted on electric locomotive undercarriages.

Growing community of inventors

Lee, MA, United States of America

Walter J Pasko