Abstract A condenser bushing assembly, and method of manufacturing same, having a generally cylindrical body portion formed of cast solid insulation, a central conductor in the body portion, and one or more concentric conductive condenser elements, radially spaced from the central conductor, disposed in the body portion. The required capacitive relationship of the conductive condenser elements is provided by metallic coatings arranged in a predetermined pattern on predetermined portions of tubular members of polycarbonate. The tubular members of polycarbonate are positioned in a mold and the insulation which forms the body portion is cast around the polycarbonate tubular members. The material used to cast the cylindrical body portion chemically attacks the polycarbonate of the tubular members during the casting operation and causes the polycarbonate to soften and amalgamate with the material of the body portion to eliminate all interfaces between the material of the body portion of the bushing and the material of the tubular members carrying the conductive elements of the condenser system.
An electrical insulating bushing assembly, comprising: a substantially cylindrical body member, said body member being formed of cast epoxy resin electrical insulating material, an axially extending electrical conductor disposed substantially centrally in said body member, at least one polycarbonate member spaced radially from said electrical conductor, said at least one polycarbonate member having a layer of electrical conductive material disposed over a predetermined portion thereof, said at least one polycarbonate member being embedded in said cylindrical body member, said epoxy resin electrical insulating material being bonded to said polycarbonate material by reaction with said polycarbonate material to form a uniform structure comprising said epoxy resin electrical insulating material and said polycarbonate material.
Claim 2
Dependent Claim
19 words
The bushing assembly of claim 2; wherein, said polycarbonate member comprises sheet polycarbonate material formed into a tubular member.
Claim 3
Dependent Claim
18 words
The bushing assembly of claim 3; wherein, said sheet polycarbonate material has a plurality of holes provided therein.
Claim 4
Dependent Claim
39 words
The bushing assembly of claim 2; wherein, said polycarbonate member comprises an extruded mesh of polycarbonate material comprising cross strands with the crossing strands joined integrally with each other and the space between crossing strands providing an open mesh.
Claim 5
Dependent Claim
27 words
The bushing assembly of claim 2; wherein, said polycarbonate member comprises an element woven from polycarbonate strands with crossing strands bonded together to form an open mesh.
Claim 6
Dependent Claim
24 words
The bushing assembly of claim 2 wherein said polycarbonate material has a different thermal coefficient of expansion than said expoxy resin electrical insulating material.