Electrical isolation layer system strand assembly and method of forming for electrical generator
AssigneeSiemens Westinghouse Power Corporation
InventorFranklin T. Emery
Life of this patent
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Abstract
An electrical isolation layer capable of inhibiting, if not preventing, a first conductive material from electrically passing or bleeding into a second conductive material and thereby causing a high resistance connection among the conductive materials is provided. The isolation layer has particular application when arranged between a conductive roebel filler and conductive strands sheathed by a porous insulator carrying a high voltage within a stator of a dynamoelectric machine used in a power generation plant.
Claims20
An electrical isolation layer system, comprising:
- a first conductive material comprising a plurality of copper strands;
- a second conductive material comprising a roebel filler;
- and
- a NOMEX fiber spun laced felt having a dielectric strength of at least 300 volts per millimeter and being positioned to abut an outer surface of the copper strands and an inner surface of the roebel filler to thereby be interposed at least partially between the copper strands and the roebel filler.
A strand assembly for use within a stator of a dynamoelectric machine of a power generation plant, comprising:
- a plurality of roebelled conductive strands that extend along a generator length;
- an insulator sheathing each of the strands;
- a conductive filler at least partially surrounding the insulated strands;
- and
- an electrical isolation layer positioned to abut an outer surface of the plurality of roebelled strands and an inner surface of the conductive filler and disposed at least partially between the insulated strands and the conductive filler material.
A method of forming a strand assembly that extends along an axial length,
- comprising:
- sheathing a plurality of conductive strands with an insulating material;
- roebelling the insulated strands;
- arranging an electrical isolation layer at least partially over the insulated strands;
- and
- arranging a conductive filler at least partially over the insulated strands
- whereby the isolation layer abuts an outer surface of the insulated strands and abuts the inner surface of the conductive filler and thereby electrically isolates the strands from the filler.
Dependencies are inferred from the claim text.