Kuhlman Corporation

John P Cochran

Herbert J Macemon

This disclosure relates to a bushing assembly for use with tank-type electrical transformers. The bushing uses a maximum amount of conductor material to provide the required shape and the necessary physical strength, and uses a minimum amount of insulating material to provide only the insulating function. The bushing may be secured to the wall of the transformer tank by an externally mating clamp assembly, or may include threads formed on the inside portion of the bushing for engaging an internally threaded securing member.

Transformer bushing

A switch adapted to interrupt high voltage electrical currents by directing an extended curvilinear arc plasma path within a fluid insulating medium. The preferred embodiment of the switch is designed to store rotational energy in a motor spring, release the stored rotational energy, and latch an opposite motor spring all in the same movement of the operator's handle. The switch also includes a mechanical overdrive unit that permits the operator's handle to be rotated only a fraction of the total rotation travelled by the movable contact. In addition, an anti-stick or weld break feature is provided that manually initiates rotation of the movable contact in the event of adhesion between the contacts. Finally, a novel contact design is disclosed which aids in controlling the path of the arc plasma as well as providing multiple contact paths to insure that proper physical connecton is made between the contacts.

Growing community of inventors

Lexington, KY, United States of America

John P Cochran