US3878319A - Corona-resistant ethylene-propylene rubber insulated power cable - Google Patents

Corona-resistant ethylene-propylene rubber insulated power cable Download PDF

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Publication number
US3878319A
US3878319A US486523A US48652374A US3878319A US 3878319 A US3878319 A US 3878319A US 486523 A US486523 A US 486523A US 48652374 A US48652374 A US 48652374A US 3878319 A US3878319 A US 3878319A
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United States
Prior art keywords
cured
ethylene
conductor
propylene rubber
rubber compound
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US486523A
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English (en)
Inventor
Ralph Edward Wahl
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Vulkor Inc
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General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US486523A priority Critical patent/US3878319A/en
Priority to IT19493/75A priority patent/IT1031078B/it
Priority to US05/543,335 priority patent/US3935042A/en
Priority to ES434241A priority patent/ES434241A1/es
Priority to FR7506973A priority patent/FR2278140A1/fr
Application granted granted Critical
Publication of US3878319A publication Critical patent/US3878319A/en
Priority to CA229,464A priority patent/CA1033427A/en
Priority to ES449876A priority patent/ES449876A1/es
Assigned to VULKOR, INCORPORATED, A CORP. OF MA reassignment VULKOR, INCORPORATED, A CORP. OF MA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GENERAL ELECTRIC COMPANY, A CORP. OF NY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers

Definitions

  • ABSTRACT Primary Examiner-Arthur T. Grimley Attorney, Agent, or Firm-R. G. Simkins; P. L. Schlamp; F. L. Neuhauser [57] ABSTRACT the body of the primary or dielectric insulation around the conductor and then heat treating the thermosetcured ethylene-propylene rubber insulation prior to applying subsequent components of the multilayered covering about the conductor, 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 contig uous layer of semiconductive material superimposed over the coating adhered to the insulation.
  • thermosetting curable ethylenepropylene rubber compounds increases the likelihood of void formation and related potential failure.
  • This invention comprises a combination of cable manufacturing conditions. cable construction and compositions therefor. for the manufacture of high voltage electric power cable having a conductor insulated with a multilayered covering. including a primary or dielectric insulating body of thermoset ethylene-propylene rubber compound. an overlying contiguous layer of semiconductive shielding. and a heat-cured. thermoset protective enclosing jacket.
  • the invention enables the production of such cable in a manner which does not promote separations of. or a parting between. the layer of primary insulation and the immediate overlying shield. and as a result thereof the formation of intermediate voids or pores which are conductive to corona or ionization.
  • the invention further comprises a method wherein the body of thermosetting or curable ethylenepropylene rubber compound forming the primary or dielectric insulation for the conductor and a component of the composite insulating covering thereon.
  • the invention entails the application and inclusion of a semiconductive coating of ingredients providing a highly vaporpermeable film extending over and securely adhered to the surface of the cured and heat treated body of ethlylenepropylene rubber compound. and an adjoining overlying layer of semiconducting material superimposed on the coating.
  • corona corona discharge or formation in the prior art patents and/or literature.
  • It is additionally an object of this invention to provide a high voltage carrying electric cable product comprising a particular combination of components and materials. including a body of primary insulation and an insulation shield. which have been combined and treated in a specific manner-whereby the product is effectively free of the presence of voids or open spaces between the primary insulation and its shield which would be a potential source of ionization.
  • the drawing is a cross-sectional view of a multilayered cable construction of this invention.
  • This invention specifically deals with a high voltage carrying power cable having a conductor insulated with a multilayered covering or assemblage.
  • a protective enclosing jacket of a heatcur ed polymeric material such as thermoset polychloroprene.
  • a metal conductor 12, which may ,be solid or stranded, can be provided with an optional inner shield of a layer 14 of semiconductive material. or other conventional components (not shown) such as a paper wrap or separating material located intermediate the conductor and the surrounding body of a primary or dielectric insulation 16.
  • the inner shield can comprise a conventional semiconductive material such as a polymer composition filled with an electro-conductive ingredient comprising particular metal or carbon black, and can be either applied as a fabric supported tape or extruded on as a continuum.
  • the body of primary or dielectric insulation 16, according to this invention. comprises a relatively thick layer of thermosetting curable ethylenepropylene rubber surrounding the conductor 12.
  • the ethylenepropylene rubber can comprise a typical ethylenepropylene copolymer or terpolymer including any of the appropriate common curing systems comprising heat-activated sulfur-containing agents, organic peroxide-containing curing agents, and coagents therefor.
  • the ethylene-propylene rubber compound for the insulation be provided with a suitable peroxode curing agent in amounts within the approximate range of about 2.5 to about 3.5 parts ofactive perioxide material per I parts by weight of ethylene-propylene rubber.
  • the ethylene-propylene rubber compound be relatively free of highly volatile ingredients such as a low molecular weight organic components.
  • the formed and cured or thermoset ethylene-propylene rubber is heat treated to purge gases or sources thereof from its mass by prolonged exposure to high temperatures of at least about 200F for a period in excess of about 12 hours. Temperatures within the approximate range of about 200F to about 300+F for periods of between abuot 12 to about 98 hours are preferred.
  • the heat treatment is carried out with a substantial .amount of the surface of the cured or thermoset ethylene-propylene rubber compound exposed to the surrounding atmosphere to encourage the emanation and dissipation of any gases therefrom.
  • the adjoining insulation shielding unit of semiconductive material overlying the surfaceof the body of insulation comprises two distinct phases including a coating 18 having semiconductive properties adhered to the surface of the body of insulation and a contiguous layer 20 of semiconductive composition superimposed over the coating 18.
  • Coating 18. which covers and is adhered to the surface of the underlying body of insulation. consists of a highly vapor-permeable film comprising'a polymeric materialcontaining-an electro-conductive filler, such as an ethylene-containing polymer or copolymer with a filler of particulate metal or carbon black.
  • the coating is applied by any suitable manner such dipping, spraying, flooding or wiping a solution. and/or dispersion thereof in an apt solvent or liquid medium. on the surface of the cured and heat-purged body of insulawith butyl rubber or other suitable elastomer containing electro-conductive filler such as particulate metal or carbon black.
  • Suitable tapes for use in this invention are commercially available from vendors including Chase & Sons. Inc., Plymouth Rubber Co. Inc., and Haartz-Mason, Inc. a
  • a layer of shielding drain or ground 22 comprising strands of metal such as tape or wire are positioned over the composite insulation shield unit of semiconductive materials composed of coating l8 and contiguous layer 20.
  • a typical drain or ground shield 22 consists of copper or aluminum tapes. or wires, wrapped helically about or otherwise fixed along the length of the assembly in contact with semiconducting layer 20.
  • a pro- I tective jacket 24 or sheath comprising a heat-cured or thermoset polymeric material such as a polychloroprene-chlorosulfonated polyethylene, butadieneacrylonitrile and polyvinyl chloride blends. butyl rubber, polyethylene, and the like.
  • An optional separator of cloth. paper or plastic film can be placed between the metal shield 22 and the overlying polymeric jacket 24 to prevent adhesion and/or penetration of the polymeric material with respect to the metal shield.
  • a further essential feature of this invention with respect to deterring separation sor a parting of the semiconductive insulation shield from the insulation with the resultant formation of detrimental corona or ionization prone voids. is the unique construction and nature of the outer insulation shield unit comprising a semiconductive composite of the coating 18 and contiguous layer 20.
  • This aspect of the invention comprises the formation or introduction of a coating of semiconductive material which is highly permeable to vapors and also is securely adhered to the surface of the underlying body of primary insulation 16 with a bonding strength effectively greater than does occur between this coating and the overlying contiguous layer 20 of semiconductive tape or extrudate.
  • the emanating gases readily permeate or diffuse through the coating '18 which is securely adhered to the surface of the underlying gas emitting insulation ratherthan causing a parting or separation therebetween at their interface.
  • the gases may not as easily pass through subsequent layers or units of denser or less permeable consistency.
  • layer 20 of the contiguous semiconductive material the possible formation of a void due to a parting or separation of semiconductive layer 20 from semiconductive coating 18 does not result in development of corona or ionization because the area of such a void or pore is effectively surrounded and protected by semiconducting material.
  • a strand or inner shield of semiconductive material composed of a carbon black filled ethylene-vinyl acetate copolymer extruded around a copper conductor.
  • a body of primary or dielectric insulation approximately one-fourth of an inch thick and of the below-identified composition, was continuously formed by extrusion around the taped conductor.
  • the ethylene-propylene rubber compound constituted the given ingredients in approximate parts by weight:
  • DiCup 40KE 40% active: DiCup 40KE.
  • Hercules The extruded insulating body of the aforesaid composition wascured to a thermoset condition by exposure to a temperature of about 406F over a dwell period of about five minutes. Thereafter. the cured ethylene-prop ylene rubber compound insulation was subjected to a heat-treatment of approximately 239F for 60 hours while the length of the unit thereof was wound with its convolutions or coils separated in a spaced pattern providing a high degree of access of the surface to the ambient atmosphere to expedite the purging of any internal gases.
  • a coating composition comprising approximately 39 'parts by weight of ethylene-vinyl acetate copolymer and approximately 59 parts by weight of carbon black disperesed in about 465 parts by weight of trichloroethane, was applied. by saturating the surface of the cured and heat treated ethylene-propylene insulation and wiping off the excess.
  • the tape was a commercial electrical tape comprising a nylon polyamide fabric impregnated with butyl rubber containing carbon black.
  • thermosetting curable polychloroprene composition consisted of in parts by weight:
  • Exemplary samples of the cable produced by the foregoing method and construction of this invention designate Examples l-lV. were tested for ionization accordingto the Insulated Power Cable Engineers Associated test S-68-5l6 Interim Standard No. l dated March, 1971, and the ionization data derived from the tests were compared with respect to ionization data from samples of Standards composed of similarly constructed cables of the same capacity which did not contain a composite insulation shield unit of semiconductive coating adhered to the primary insulation com-. bined with a contiguous layer of semiconductive material.
  • the Standards of A, B and C comprised samples of the same cable construction as the Examples of this invention, except for the omission therefrom of the coating 18 having semiconductive properties adhered to the surface of the body of insulation 16, and wherein the manufacturing heat treatment of the same intensity and time as the Examples was carried out with the material wound on a reel in a normal manner with the convolutions in a contiguous relationship.
  • the standards of D and E comprised samples of the same cable construction as the Examples of this invention, namely. including coating 18 described above, which were subjected to the same manufacturing heat treatment under the conditions applied in Standards A, B and C. that is with the material wound on a reel in a normal manner with the convolutions in a contiguous relationship.
  • An electric power cable composed of an assemblage of a conductor having a composite covering thereabout. comprising the combination including:
  • a vapor-permeable coating comprising an ethylene-containing polymer and electro-conductive filler covering and adhered to said cured and heattreated ethylene-propylene rubber compound;
  • the layer of semiconductive material overlying the vaporpermeable coating comprises a fabric'impregnated with i an elastomer containing an electro-conductive tiller.
  • a vapor-permeable coating comprising a copolymer of ethylene-vinyl acetate and carbon black filler covering and adhered to said cured and heat treated ethylene-propylene rubber compound;
  • the electric power cable of claim 5, wherein the layer of semiconductive material overlying the vapor v permeable coating comprises a nylon polyamide fabric 7 impregnated with butyl rubber.
  • An electric power cable composed of an assemblage of a conductor having a composite covering thereabout, comprising the combination including:
  • an inner layer of semiconductive material comprising a polymeric compound and electroconductive filler shielding the conductor
  • a vapor-permeable coating comprising an ethylene-containing polymer and electro-conductive filler covering and adhered to said cured and heat treated ethylene-propylene rubber compound;
  • an outer layer of semiconductive material comprising an elastomer and electro-conductive filler overlying said vapor-permeable coating
  • vapor-permeable coating adhered to the cured and heat-treated ehtylene-propylene rubber compound comprises a copolymer of ethylene-vinyl acetate and carbon black filler.
  • the outer layer of semiconductive material overlying the vapor-permeable coating comprises a nylon polyamide fabric impregnated with butyl rubber containing carbon black filler.
  • a ametallic conductor
  • v l v b an inner layerofsemiconductive material comprising a polymeric compound and electrorconductive filler shielding the conductor
  • a dielectric insulating body of a cured ethylenepropylene rubber compound surrounding the shielded conductor having been treated by heating to a temperature of about 200F to about 300F for a period of about-24 hours to about 98 hours subsequent to its curing;
  • a vapor-permeable coating comprising a copolymer of ethylene-vinyl acetate and carbon black filler covering and adhered to said cured and heat semiconductive layer: and treated ethylene-propylene rubber compound; g. an enclosing protective jacket of cured polychloroe an outer layer of semiconductivc material comprisprene.

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  • Insulating Bodies (AREA)
  • Organic Insulating Materials (AREA)
  • Conductive Materials (AREA)
  • Insulated Conductors (AREA)
US486523A 1974-07-08 1974-07-08 Corona-resistant ethylene-propylene rubber insulated power cable Expired - Lifetime US3878319A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US486523A US3878319A (en) 1974-07-08 1974-07-08 Corona-resistant ethylene-propylene rubber insulated power cable
IT19493/75A IT1031078B (it) 1974-07-08 1975-01-22 Metodo di fabbricazione di un cavo di potenza isolato in gomma ettlen propi enica resistente all effetto corona e prodotto ottenuto con esso
US05/543,335 US3935042A (en) 1974-07-08 1975-01-23 Method of manufacturing corona-resistant ethylene-propylene rubber insulated power cable, and the product thereof
ES434241A ES434241A1 (es) 1974-07-08 1975-01-29 Perfeccionamientos introducidos en cables para energia elec-trica.
FR7506973A FR2278140A1 (fr) 1974-07-08 1975-03-06 Cable electrique resistant a l'effet couronne et procede de fabrication
CA229,464A CA1033427A (en) 1974-07-08 1975-06-13 Semi-conductive insulated power cable
ES449876A ES449876A1 (es) 1974-07-08 1976-07-16 Un metodo de fabricar cable para energia electrica.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US486523A US3878319A (en) 1974-07-08 1974-07-08 Corona-resistant ethylene-propylene rubber insulated power cable

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/543,335 Division US3935042A (en) 1974-07-08 1975-01-23 Method of manufacturing corona-resistant ethylene-propylene rubber insulated power cable, and the product thereof

Publications (1)

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US3878319A true US3878319A (en) 1975-04-15

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US486523A Expired - Lifetime US3878319A (en) 1974-07-08 1974-07-08 Corona-resistant ethylene-propylene rubber insulated power cable

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US (1) US3878319A (enExample)
CA (1) CA1033427A (enExample)
ES (2) ES434241A1 (enExample)
FR (1) FR2278140A1 (enExample)
IT (1) IT1031078B (enExample)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008367A (en) * 1974-06-24 1977-02-15 Siemens Aktiengesellschaft Power cable with plastic insulation and an outer conducting layer
US4109098A (en) * 1974-01-31 1978-08-22 Telefonaktiebolaget L M Ericsson High voltage cable
US4133936A (en) * 1975-05-12 1979-01-09 General Electric Company Heat resistant ethylene-propylene rubber and insulated conductor product thereof
US4145567A (en) * 1977-06-06 1979-03-20 General Cable Corporation Solid dielectric cable resistant to electrochemical trees
US4145475A (en) * 1977-10-17 1979-03-20 General Electric Company Flame and heat resistant ethylene-propylene rubber and conductor product insulated therewith
US4247504A (en) * 1976-10-18 1981-01-27 Oy Nokia Ab Method of manufacturing plastic covered highvoltage cables
FR2475280A1 (fr) * 1980-01-31 1981-08-07 Sumitomo Electric Industries Cable d'allumage tres perfectionne
US4373048A (en) * 1980-04-21 1983-02-08 Amp Incorporated High voltage flame retardant EPOM insulating compositions
US4385203A (en) * 1981-03-03 1983-05-24 The Okonite Company Sealed cable and method of manufacturing
US4532375A (en) * 1981-10-22 1985-07-30 Ricwil, Incorporated Heating device for utilizing the skin effect of alternating current
US4617449A (en) * 1981-10-22 1986-10-14 Ricwil, Incorporated Heating device for utilizing the skin effect of alternating current
US4691082A (en) * 1985-03-14 1987-09-01 Brown, Boveri & Cie Ag Plastic cable
US4785138A (en) * 1985-12-06 1988-11-15 Kabel Electro Gesellschaft mit beschrankter Haftung Electric cable for use as phase winding for linear motors
US5274712A (en) * 1992-03-09 1993-12-28 Lindsay David S High resistivity inner shields for audio cables and circuits
US5339038A (en) * 1992-07-06 1994-08-16 Westinghouse Electric Corporation Assembly for detecting and locating cable pinching
US5574249A (en) * 1994-07-18 1996-11-12 Lindsay Audiophile Inc. High resistivity inner shields for cabinets housing electronic circuitry
WO1996042089A1 (en) * 1995-06-08 1996-12-27 Weijun Yin Pulsed voltage surge resistant magnet wire
US5654095A (en) * 1995-06-08 1997-08-05 Phelps Dodge Industries, Inc. Pulsed voltage surge resistant magnet wire
US5861578A (en) * 1997-01-27 1999-01-19 Rea Magnet Wire Company, Inc. Electrical conductors coated with corona resistant, multilayer insulation system
US6060162A (en) * 1995-06-08 2000-05-09 Phelps Dodge Industries, Inc. Pulsed voltage surge resistant magnet wire
US6417457B1 (en) * 1999-06-17 2002-07-09 Nexans Electrical subsea cable
US6781052B2 (en) * 2002-04-12 2004-08-24 Nexpress Solutions, Inc. High voltage cable EMI shield
CN105427922A (zh) * 2015-12-18 2016-03-23 江苏上上电缆集团有限公司 一种高压直流电缆及其制造方法和绝缘料
US20160148717A1 (en) * 2014-11-20 2016-05-26 Hitachi Metals, Ltd. Semiconductive resin composition and power transmission cable using same
US20200126687A1 (en) * 2016-12-27 2020-04-23 Prysmian S.p. A. Electric cable having a protecting layer
US10959295B2 (en) 2016-05-10 2021-03-23 Nvent Services Gmbh Shielded wire for high voltage skin effect trace heating
US11006484B2 (en) 2016-05-10 2021-05-11 Nvent Services Gmbh Shielded fluoropolymer wire for high temperature skin effect trace heating

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060261A (en) * 1960-03-30 1962-10-23 Anaconda Wire & Cable Co Shielded electric cable
US3259688A (en) * 1964-01-02 1966-07-05 Gen Electric High voltage insulated electrical cable with layer of irradiated semiconductive ethylene copolymer
US3472692A (en) * 1966-04-06 1969-10-14 Fujikura Ltd Butyl rubber-insulated electric cable and method of manufacture thereof
US3479446A (en) * 1968-06-27 1969-11-18 Anaconda Wire & Cable Co Strand shielded cable and method of making
US3541228A (en) * 1967-05-23 1970-11-17 Pirelli Medium voltage cables
US3569610A (en) * 1969-10-15 1971-03-09 Gen Cable Corp Ethylene-propylene rubber insulated cable with cross-linked polyethylene strand shielding
US3617377A (en) * 1966-06-10 1971-11-02 Fujikura Ltd Insulation consisting of ethylene-propylene rubber composition for electric wire and cable
US3643004A (en) * 1970-04-03 1972-02-15 Phelps Dodge Copper Prod Corona-resistant solid dielectric cable
US3646248A (en) * 1971-02-22 1972-02-29 Anaconda Wire & Cable Co Electric cable
US3684821A (en) * 1971-03-30 1972-08-15 Sumitomo Electric Industries High voltage insulated electric cable having outer semiconductive layer
US3748369A (en) * 1971-03-08 1973-07-24 Gen Cable Corp Method of shielding high voltage solid dielectric power cables
US3749817A (en) * 1970-12-28 1973-07-31 Sumitomo Electric Industries Insulated cable having strand shielding semi-conductive layer
US3787255A (en) * 1972-05-30 1974-01-22 Essex International Inc Insulated cable with sheath of controlled peel strength and method
US3792192A (en) * 1972-12-29 1974-02-12 Anaconda Co Electrical cable
US3832481A (en) * 1973-10-04 1974-08-27 Borg Warner High temperature, high pressure oil well cable

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060261A (en) * 1960-03-30 1962-10-23 Anaconda Wire & Cable Co Shielded electric cable
US3259688A (en) * 1964-01-02 1966-07-05 Gen Electric High voltage insulated electrical cable with layer of irradiated semiconductive ethylene copolymer
US3472692A (en) * 1966-04-06 1969-10-14 Fujikura Ltd Butyl rubber-insulated electric cable and method of manufacture thereof
US3617377A (en) * 1966-06-10 1971-11-02 Fujikura Ltd Insulation consisting of ethylene-propylene rubber composition for electric wire and cable
US3541228A (en) * 1967-05-23 1970-11-17 Pirelli Medium voltage cables
US3479446A (en) * 1968-06-27 1969-11-18 Anaconda Wire & Cable Co Strand shielded cable and method of making
US3569610A (en) * 1969-10-15 1971-03-09 Gen Cable Corp Ethylene-propylene rubber insulated cable with cross-linked polyethylene strand shielding
US3643004A (en) * 1970-04-03 1972-02-15 Phelps Dodge Copper Prod Corona-resistant solid dielectric cable
US3749817A (en) * 1970-12-28 1973-07-31 Sumitomo Electric Industries Insulated cable having strand shielding semi-conductive layer
US3646248A (en) * 1971-02-22 1972-02-29 Anaconda Wire & Cable Co Electric cable
US3748369A (en) * 1971-03-08 1973-07-24 Gen Cable Corp Method of shielding high voltage solid dielectric power cables
US3684821A (en) * 1971-03-30 1972-08-15 Sumitomo Electric Industries High voltage insulated electric cable having outer semiconductive layer
US3787255A (en) * 1972-05-30 1974-01-22 Essex International Inc Insulated cable with sheath of controlled peel strength and method
US3792192A (en) * 1972-12-29 1974-02-12 Anaconda Co Electrical cable
US3832481A (en) * 1973-10-04 1974-08-27 Borg Warner High temperature, high pressure oil well cable

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4109098A (en) * 1974-01-31 1978-08-22 Telefonaktiebolaget L M Ericsson High voltage cable
US4008367A (en) * 1974-06-24 1977-02-15 Siemens Aktiengesellschaft Power cable with plastic insulation and an outer conducting layer
US4133936A (en) * 1975-05-12 1979-01-09 General Electric Company Heat resistant ethylene-propylene rubber and insulated conductor product thereof
US4247504A (en) * 1976-10-18 1981-01-27 Oy Nokia Ab Method of manufacturing plastic covered highvoltage cables
US4145567A (en) * 1977-06-06 1979-03-20 General Cable Corporation Solid dielectric cable resistant to electrochemical trees
US4145475A (en) * 1977-10-17 1979-03-20 General Electric Company Flame and heat resistant ethylene-propylene rubber and conductor product insulated therewith
FR2475280A1 (fr) * 1980-01-31 1981-08-07 Sumitomo Electric Industries Cable d'allumage tres perfectionne
US4366464A (en) * 1980-01-31 1982-12-28 Sumitomo Electric Industries Ignition cables
US4373048A (en) * 1980-04-21 1983-02-08 Amp Incorporated High voltage flame retardant EPOM insulating compositions
US4385203A (en) * 1981-03-03 1983-05-24 The Okonite Company Sealed cable and method of manufacturing
US4532375A (en) * 1981-10-22 1985-07-30 Ricwil, Incorporated Heating device for utilizing the skin effect of alternating current
US4617449A (en) * 1981-10-22 1986-10-14 Ricwil, Incorporated Heating device for utilizing the skin effect of alternating current
US4691082A (en) * 1985-03-14 1987-09-01 Brown, Boveri & Cie Ag Plastic cable
US4785138A (en) * 1985-12-06 1988-11-15 Kabel Electro Gesellschaft mit beschrankter Haftung Electric cable for use as phase winding for linear motors
US5274712A (en) * 1992-03-09 1993-12-28 Lindsay David S High resistivity inner shields for audio cables and circuits
US5339038A (en) * 1992-07-06 1994-08-16 Westinghouse Electric Corporation Assembly for detecting and locating cable pinching
US5574249A (en) * 1994-07-18 1996-11-12 Lindsay Audiophile Inc. High resistivity inner shields for cabinets housing electronic circuitry
WO1996042089A1 (en) * 1995-06-08 1996-12-27 Weijun Yin Pulsed voltage surge resistant magnet wire
US5654095A (en) * 1995-06-08 1997-08-05 Phelps Dodge Industries, Inc. Pulsed voltage surge resistant magnet wire
US6060162A (en) * 1995-06-08 2000-05-09 Phelps Dodge Industries, Inc. Pulsed voltage surge resistant magnet wire
US6180888B1 (en) * 1995-06-08 2001-01-30 Phelps Dodge Industries, Inc. Pulsed voltage surge resistant magnet wire
US5861578A (en) * 1997-01-27 1999-01-19 Rea Magnet Wire Company, Inc. Electrical conductors coated with corona resistant, multilayer insulation system
US5917155A (en) * 1997-01-27 1999-06-29 Rea Magnet Wire Company, Inc. Electrical conductors coated with corona resistant multilayer insulation system
US6056995A (en) * 1997-01-27 2000-05-02 Rea Magnet Wire Company, Inc. Method of coating electrical conductors with corona resistant multi-layer insulation
US6417457B1 (en) * 1999-06-17 2002-07-09 Nexans Electrical subsea cable
US6781052B2 (en) * 2002-04-12 2004-08-24 Nexpress Solutions, Inc. High voltage cable EMI shield
US20160148717A1 (en) * 2014-11-20 2016-05-26 Hitachi Metals, Ltd. Semiconductive resin composition and power transmission cable using same
US9905326B2 (en) * 2014-11-20 2018-02-27 Hitachi Metals, Ltd. Semiconductive resin composition and power transmission cable using same
CN105427922A (zh) * 2015-12-18 2016-03-23 江苏上上电缆集团有限公司 一种高压直流电缆及其制造方法和绝缘料
CN105427922B (zh) * 2015-12-18 2017-04-26 江苏上上电缆集团有限公司 一种高压直流电缆的制造方法
US10959295B2 (en) 2016-05-10 2021-03-23 Nvent Services Gmbh Shielded wire for high voltage skin effect trace heating
US11006484B2 (en) 2016-05-10 2021-05-11 Nvent Services Gmbh Shielded fluoropolymer wire for high temperature skin effect trace heating
US20200126687A1 (en) * 2016-12-27 2020-04-23 Prysmian S.p. A. Electric cable having a protecting layer

Also Published As

Publication number Publication date
CA1033427A (en) 1978-06-20
ES434241A1 (es) 1977-04-01
FR2278140B1 (enExample) 1981-05-29
IT1031078B (it) 1979-04-30
FR2278140A1 (fr) 1976-02-06
ES449876A1 (es) 1977-08-16

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GENERAL ELECTRIC COMPANY, A CORP. OF NY;REEL/FRAME:004835/0028

Effective date: 19871222