Method of making an electrical transformer
AssigneeWestinghouse Electric Corp.
InventorRichard D. Buckley
Life of this patent
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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.
Claims5
A method of forming cooling ducts in the winding of an electrical transformer cooled by a liquid dielectric, comprising the steps of:
- winding an electrical conductor to form an electrical winding having a plurality of conductor turns,
- placing plastic tubes in the electrical winding as its conductor turns are being formed, with said plastic tubes being formed of a material dissolvable in the liquid dielectric,
- forming a core-coil assembly, using the electrical winding,
- placing the core-coil assembly in a tank containing liquid dielectric, to form a liquid cooled electrical transformer,
- and dissolving the plastic tubes in the liquid dielectric.
Dependencies are inferred from the claim text.