General Electric Company

Ralph E Wahl

Joseph E Vostovich

Alfred C Bruhin

Thaddeus Dominick Misiura

A cable structure having a stranded inner conductor and an insulating layer over the conductor is formed by feeding a tape of semiconducting material onto the wire as it enters an extruder head. The tape is not spirally wound on the conductor but rather is fed longitudinally along with the wire into the extruder head so as to dispose the tape about the wire and beneath the insulation layer extruded thereon. The product formed has a good concentricity and the tape element conforms generally to the stranded wire to provide a minimum thickness of the tape composition to permit the cable to function effectively at medium voltage. The tape employed is preferably a semiconducting tape which can serve to distribute the electrical stresses emanating from the conductor when it is at high voltage. The tape may be formed of a crosslinkable material and the outer insulation may also be crosslinkable. Cable products having crosslinked insulation separated from a stranded conductor by a crosslinked semiconducting layer formed of a ring of crescents may be formed.

Method of forming concentric cable layer and article formed

A compressed, multi-layered, concentric layer stranded cable electrical conductor with each succeeding overlying layer of strands helically wound in an alternately opposite direction, comprising the product of sequentially circumferentially compressing each succeeding overlying layer of cross lay strands to a regressively reduced state of consolidation.

Differentially compressed, multi-layered, concentric cross lay stranded

A composite of polymeric materials which are adheringly joined to each other and which can be easily and cleanly separated by stripping apart with a low pulling force whereupon the contacting surfaces of their interface separate cleanly without retention of any residue on one from the other, and which comprises the combination of a previously cured body of a copolymer of ethylene and propylene adjoined to a subsequently cured body of an elastomeric blend of a copolymer of ethylene and propylene admixed with chlorosulfonated polyethylene. The combination of materials is especially advantageous when used in electrically conducting wire and cable constructions as a composite of an electrical insulation and an overlying strippable semiconductive layer.

Strippable composite of polymeric materials for use in insulated

A method of manufacturing high voltage carrying electric power cable having a conductor insulated with a multilayered covering, and the cable product thereof. The cable construction includes a primary or dielectric insulating body of thermoset ethylene-propylene rubber and a thermoset jacket about the conductor, which is substantially free of corona-prone or ionization-prone voids and separations intermediate the layers. The method comprises forming and curing the ethylene-propylene rubber compound constituting the body of the primary or dielectric insulation around the conductor and then heat treating the thermoset-cured ethylene-propylene rubber insulation prior to applying subsequent components of the multilayered covering about the condutor, including an overlying semiconductive shielding layer and a protective enclosing jacket of heat-cured thermoset polymer. The semiconductive shielding layer overlying the body or primary of dielectric insulation around the conductor, comprises a combination of a highly vapor-permeable coating of semiconductive material adhered to the surface of the underlying body of insulation and a contiguous layer of semiconductive material superimposed over the coating adhered to the insulation.

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Trumbull, CT, United States of America

Ralph E Wahl