Means for fixing winding overhangs in electrical machines
First Claim
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1. A string comprising:
- a core of fibers extending substantially in a longitudinal direction of said string, said fibers forming a roving which is elastic in a direction perpendicular to said longitudinal direction; and
an elastic sheath surrounding said roving, wherein said elastic sheath is impregnated, at least in a region near an outer surface thereof, with a conductive impregnating agent which is inert toward an impregnating resin which is subsequently applied to said string.
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Accused Products
Abstract
To fix the conductors and coils of wind overhangs and to fill cavities in the winding overhangs of electrical machines, strings are used which include compressible rovings (1) made up of fibers and surrounded by an elastic sheath (2) which is permeable to impregnating resin. A spacing is introduced into the winding overhangs with a thickness which is greater than the spacings to be filled. The strings are impregnated after they are pulled in. To improve the overhang corona shielding, the strings are treated with a conductive impregnating agent which is permeable to the impregnating resin before they are pulled in.
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Citations
4 Claims
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1. A string comprising:
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a core of fibers extending substantially in a longitudinal direction of said string, said fibers forming a roving which is elastic in a direction perpendicular to said longitudinal direction; and an elastic sheath surrounding said roving, wherein said elastic sheath is impregnated, at least in a region near an outer surface thereof, with a conductive impregnating agent which is inert toward an impregnating resin which is subsequently applied to said string. - View Dependent Claims (2, 3, 4)
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Specification
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Current AssigneeAlstom SA
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Original AssigneeAsea Brown Boveri Ltd (ABB Limited)
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InventorsLitenas, Michael, Schuler, Roland
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Primary Examiner(s)NIMMO, MORRIS
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Application NumberUS08/054,236Time in Patent Office935 DaysField of Search174/127, 174/69, 174/113 C, 174/119 C, 174/131 A, 29/596, 310/42US Class Current174/127CPC Class CodesH02K 15/12 Impregnating, heating or dr...H02K 3/505 for large machine windings,...Y10S 174/13 High voltage cable, e.g. ab...
