Method of making an electrical transformer

Details Method of making an electrical transformer Method of making an electrical transformer

1984-04-27

1985-09-17

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29423, 264317, H01F 4106

Patent

active

045411719

ABSTRACT:
A method of forming cooling ducts in the windings of a liquid cooled electrical transformer without adding permanent duct formers to the winding, and without requiring an additional manufacturing step to remove duct formers. Plastic tubes dissolvable in the liquid dielectric are utilized as the duct formers. Thermal siphon flow of the liquid through the tube openings when the transformer is energized dissolves the tubes and enlarges the cooling ducts to the outside dimensions of the tubes.

REFERENCES:
patent: 240459 (1881-04-01), Quinby
patent: 4337569 (1982-07-01), Pierce
patent: 4503605 (1985-03-01), Buckley

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