Semi-conducting layer for insulated electrical conductors
First Claim
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1. A layer covering insulated windings of an electrical machine, of the type having a slot along an axial length of said machine, comprising:
- a semiconducting pyrolyzed glass fiber material having a resistivity in the range of 200 to 10,000,000 ohms per square being in intimate contact with insulation of the insulated windings along substantially said axial length of said machine.
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Abstract
A semi-conducting pyrolyzed glass fiber layer equalizes the electrical potential on the exterior surface of an insulated conductor when the layer covers the surface. The layer prohibits the development of a corona discharge and bleeds off any electrical charge developed thereon when the layer is electrically coupled to a body having a known potential. The insulated conductor may be windings in a dynamoelectric machine.
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Citations
5 Claims
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1. A layer covering insulated windings of an electrical machine, of the type having a slot along an axial length of said machine, comprising:
a semiconducting pyrolyzed glass fiber material having a resistivity in the range of 200 to 10,000,000 ohms per square being in intimate contact with insulation of the insulated windings along substantially said axial length of said machine. - View Dependent Claims (2)
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3. An assembly in an electromagnetic machine comprising:
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an electrically grounded core defining axially extending, circumferentially spaced, radially directed slots; a plurality of insulated windings disposed in said slots; a layer of semi-conducting pyrolyzed glass fiber material having resistivity in the range of 200 to 10,000,000 ohms per square being in intimate contact with and substantially covering insulation of the insulated windings and said layer of semi-conducting material being in electrical contact with said grounded core; and means for retaining said insulated windings in said slots. - View Dependent Claims (4, 5)
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Specification