Semiconductor binding tape and an electrical member wrapped therewith
First Claim
1. An insulated electrical member, comprising at least one conductor wrapped with mica insulation and covered with a semiconducting binding tape, the whole being impregnated with a cured epoxy-styrene resin;
- wherein the binding tape comprises a porous, open weave substrate of electrically semiconducting fibrous strands;
the fibrous strands coated with between about 15 to 40 weight percent of a carbon filled, completely thermoset, styrene resistant, protective varnish composition, the protective varnish composition consisting essentially of a cured, heat reactive phenolic alkyd admixture of 40 wt% to 75 wt% of a phenolic component and 60 wt% to 25 wt% of an alkyd component;
said varnish composition containing between about 15 to 45 weight percent of electrically contacting carbon particles having a total internal and external surface area of up to about 600 square meters/gram, uniformly distributed therethrough, the interior of the carbon being substantially free of the varnish and resin, to provide fibrous strands that conduct electricity, said impregnated binding tape having a resistivity value of up to about 15,000 ohms/square.
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Abstract
An insulated electrical member is made comprising at least one conductor wrapped with mica insulation and covered with a semiconducting binding tape, the whole being impregnated with a curable epoxy-styrene resin; where the binding tape comprises a porous, open weave substrate of electrically semiconducting fibrous strands, each fibrous strand being substantially permeated with a filled, thermosettable, protective varnish composition, the varnish composition containing between about 15 to 45 weight percent of electrically contacting carbon particles having a total internal and external surface area of up to about 600 square meters/gram, uniformly distributed therethrough, the interior of the carbon being substantially free of the varnish and resin, to provide fibrous strands that will conduct electricity.
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Citations
3 Claims
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1. An insulated electrical member, comprising at least one conductor wrapped with mica insulation and covered with a semiconducting binding tape, the whole being impregnated with a cured epoxy-styrene resin;
- wherein the binding tape comprises a porous, open weave substrate of electrically semiconducting fibrous strands;
the fibrous strands coated with between about 15 to 40 weight percent of a carbon filled, completely thermoset, styrene resistant, protective varnish composition, the protective varnish composition consisting essentially of a cured, heat reactive phenolic alkyd admixture of 40 wt% to 75 wt% of a phenolic component and 60 wt% to 25 wt% of an alkyd component;
said varnish composition containing between about 15 to 45 weight percent of electrically contacting carbon particles having a total internal and external surface area of up to about 600 square meters/gram, uniformly distributed therethrough, the interior of the carbon being substantially free of the varnish and resin, to provide fibrous strands that conduct electricity, said impregnated binding tape having a resistivity value of up to about 15,000 ohms/square. - View Dependent Claims (2, 3)
- wherein the binding tape comprises a porous, open weave substrate of electrically semiconducting fibrous strands;
Specification