US3775549A - Electrically insulating polyproplyene laminate paper and oil-impregnated electric power cable using said laminate paper - Google Patents

Electrically insulating polyproplyene laminate paper and oil-impregnated electric power cable using said laminate paper Download PDF

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Publication number
US3775549A
US3775549A US3775549DA US3775549A US 3775549 A US3775549 A US 3775549A US 3775549D A US3775549D A US 3775549DA US 3775549 A US3775549 A US 3775549A
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United States
Prior art keywords
paper
electrically insulating
laminate
oil
polypropylene
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Expired - Lifetime
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English (en)
Inventor
S Matsuda
H Kuwabara
H Kubo
Y Sasajima
K Suzuki
T Fukamachi
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Sumitomo Electric Industries Ltd
Tomoegawa Paper Manufacturing Co Ltd
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Sumitomo Electric Industries Ltd
Tomoegawa Paper Manufacturing Co Ltd
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Priority claimed from JP4547871A external-priority patent/JPS5410712B1/ja
Priority claimed from JP5057271A external-priority patent/JPS5133279B1/ja
Application filed by Sumitomo Electric Industries Ltd, Tomoegawa Paper Manufacturing Co Ltd filed Critical Sumitomo Electric Industries Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • H01B3/485—Other fibrous materials fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/08—Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/30—Drying; Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/3188—Next to cellulosic
    • Y10T428/31895—Paper or wood

Definitions

  • ABSTRACT An insulation for electric cables which comprises a biaxially oriented polypropylene film bonded to an oilimpregnated paper by means of a melt-extruded polyolefin adhesive and the resulting insulated cable are disclosed.
  • plastic films having low tan 8 as such an electrically insulating tape, instead ofthe conventional electricallyinsulating paper.
  • the plastic films have very good initial impulse strength dielectric characteristics, but have the defect that they are drastically deteriorated in resistances to repeated application of impulse voltage or to AC voltage for prolonged periods'of time. In addition, they have the temperature dependent characteristics inherent in plastic films or have large polar effects on impulse voltage.
  • the plastic films have poor work ing efficiency, for example in tape winding operations, because of lack of rigidity, and the packing action inherent in the plastic films makes it difficult to dry electric cables or other electric machinery under vacuum which in turn leads to poor flowability of insulating gases-or oils.
  • oil-impregnated paper has inferior dielectric characteristics or electric breakdown strength compared to the plastic films, but is superior in other respects.
  • the tan of oil'- impregnated paper is considered to be 0.1 percent at the lowest, and temperature rise due to tan 8 loss exerts I limitations on the application of electric cables or other equipment to extrahigh voltage and on the reduction in size of such electric equipment.
  • a system has been devised which consists of alternate winding of the above-described plastic film and oilimpregnated paper in an attempt to utilize the merits of these two materials.
  • this system is so arranged that the plastic film faces the conductor, it is weak to positively polar impulses.
  • the electrically insulating paper may be first wound facing the conductor and then the plastic film is wound thereon, in the case of transformers or capacitors. With electric cables, a larger proportion of the plastic film faces the conductor side in an oil layer and the defect of weakness to positively polar impulses is not eliminated.
  • this alternately wound system too,
  • the plastic film of small rigidity needs to be wound alone, and therefore, improvement in working efficiency can hardly be hoped for.
  • the present invention has eliminated the' abovementioned defects, and its first feature is to provide an electrically insulating polypropylene laminate paper comprising an integrated assembly of a biaxially stretched polypropylene film and an electrically insulating paper bonded to each other through the medium of a molten polyolefin such as polypropylene or an ethylene/propylene copolymer.
  • a second feature of this invention is to provide an electric cable wherein a tape of the above-mentioned electrically insulating polypropylene laminate paper is wound on an electric conductor to form insulation layers, and an insulation oil is impregnated therein.
  • a third feature of this invention is to provide an electric cable impregnated with an electrically insulating oil by winding the electrically insulating polypropylene laminate on a conductor while the electrically insulating paper is being rendered wet, and then drying it to remove moisture, which process is based on the utilization of the moisture absorbing characteristics of the electrically insulating paper.
  • FIG. 1 is a sectional view of a single-core OF cable of the present invention.
  • FIGS. 2(a) and 2(b) show the results of an impulse breakdown test on a sheet impregnated with an alkylbenzene oil.
  • FIGS. 3(a) and 3(b) are enlarged sectional views of the insulating layer(s) of the present invention.
  • FIG. 4 shows the result of an impulse breakdown test on an OF paper-polypropylene sheet impregnated with an alkylbenzene oil.
  • FIG. 5 shows the variation in the amount of oil which is impregnated into different types of cables with immersion time in the oil.
  • the polypropylene used is an unoriented polypropylene which has inferior properties to biaxially oriented polypropylene.
  • polystyrene resin examples of the polyolefin as an adum 121.6 3 3.0 10 hesive are polypropylene and an ethylene/propylene V copolymer.
  • the experimental results will be described l rifi b le l", the x'c t'retkaawa"Stran ers "a time below.
  • the pea s trength is a v alue of ilf'stfrengtlfof a 15 of OF oil, insulation thickness and conductor diameter. mm wide sample measured by a tensile tester. The oil Larger values show that the inherent oil flow resistancev resistance is evaluated by observing the shape of the of the material is large. It is seen from the results shown sample after it has been immersed for 5 days at 80 C in Table 1 that the sample (B) consisting of the electriin an alkylbenzene.
  • the tan 8 is a value measured at cal insulation paper and the biaxially oriented polypro- Hz at C while the sample contains the alkylbenzene pylene film is superior in AC breakdown strength and impregnated therein.
  • the impulse strength is a value oil resistance. A greater difference is the oil flow resis- 60 measured with respect 'to a flat plate sample impregtance.
  • Experience of the inventors of this invention innated with the alkylbenzene same as in the case of the dicates that if a cable has a coefficient of inherent oil impulse strength, with the insulating paper being diflow resistance of about 6.2 X 10 cm or less, it can rected to the side of the positive pole.
  • samples (A) and (P), which fluctuations in oil pressure which are inherent to ca- 6 were produced by melting polypropylene or an bles: FI'OmIhIS VIeWPOmI, the Sample COHSlStlHg 0f ethylene/propylene copolymer by the extrusion process the lnsulatlng paper nd the unorlented p lypr py to make them filmy, and bonding a biaxially oriented poses a problem 111 P acti efilm of polypropylene to an electrical insulating paper using said molten polypropyleneor ethylene/propylene copolymer as an adhesive, were best balanced in respect of bondystrength, oil resistance, tan and impulse strength.
  • the biaxially oriented polypropylene film had "been Stretched Ito 48X" (longitudinal stretch x 3 transverse stretch).
  • the biaxially ori- ,insu'lating paper faces the conductor, the polypropylene film surface does not face the conductor in an oil layer. Therefore, such an insulated cable does not produce'a polar effect which isseen in the conventional plastic tape-wound cable which hasweak resistance to positively polar impulses, and moreover proves far superior to oil-impregnated paper in respect of electric breakdown strength and dielectricloss.
  • the thickness of the polypropylene film adhesive should preferably be as thin as possible. This swelling can be reduced by the compression characteristics of the biaxially oriented polypropylene film and electrically insulating paper.
  • a thin electrically insulating paper having low strength is l j,;,. i 3,775,549
  • the thickness of the polypropylene film adhesive should be as thin as possible.
  • the sample was then heated at C, and then taken out after a lapse of 30 days.
  • The-sample was unwound and it was found that the sample in which the thickness of the polypropylene film adhesive was 70 p. m torn off partially at the part of the insulating paper. This shows that owing to the swelling of the polypropylene, the paperwas cut.
  • the results of this experiment showed that the thickness of the polypropylene film adhesive should be about three-fourths or less of the thickness of the insulating paper to be used. In order to prevent the tear of the paper by the swelling of polypropylene,
  • the insulating paper to be used should also be as thin as possible.
  • the biaxially oriented polypropylene film is available in a wide variety of thicknesses. Those having large thickness (about p. m or more) cause a reduction in electric breakdown strength, and therefore, in the laminated paper of this invention, the thickness of the biaxially oriented polypropylene film should preferably be not more than about 100 p. m.
  • Samples were prepared by bonding a 60 p. m biaxially oriented polypropylene film to an insulating paper of various thicknesses using 15 p. m thick polypropylene as adhesive in accordance with the extrusion process. Each of these samples was immersed in a cable oil, and changes of the impulse strength of the sample according to the thickness of the insulating paper were examined. The results are given in Table 4.
  • FIG. 1 shows a sectional view of a single-core OF cable in accordance with this invention.
  • the reference numeral 1 represents a copper or aluminum conductor; 3"! er al..ssmircq d s ei stall; an t rna semi-conductor layer; 3, an insulation layer composed of a tape of a polypropylene laminate paper of this invention consisting of a biaxially oriented polypropylene film and an electrically insulating paper and being impregnated with an insulating oil, forexample OF-oil, dedecylbenzen e tridecylbenzene mono-dialkylated naphthalene; 4, a metal sheath; and 5, an anti-corrosive layer.
  • plastic films have good initial voltage resistance characteristics but have the defect of being considerably deteriorated in breakdown characteristics against repeated application of impulse or AC voltage for prolonged periods of time, and also have the disadvantage that they have temperature'dependent characteristics, a property inherent in plastics and exert a large polar effect. Furthermore, creases may occur at the time of manufacture of the cables or building a transmission system using the cables, or because of packing action between the plastic films, there are problems of poor vacuum formation, poor impregnation of oil, and bad oil resistance. These difficulties set limitations on the practical use of the plastic films for cable insulation.
  • oil-impregnated paper has been in wide use as an insulation layer of selfcontained or type-filled oil-incorporated electric cables, of cablesof 60'KV to 500'KV because of its superiority in various properties other than dielectric constant and dielectric loss tangent.
  • the dielectric constant of such oil-impregnated'paper is limited to 3.4-3.7, and its dielectric loss tangent is 0.1 percent at the lowest. Therefore, limitations are imposed by temperature increases owing to tan 8 loss, and it has been considered difficult to build cables of l the order of 1,000 KV even if forced cooling is applied.
  • the cable of this invention is so designed that the ratio of e of an oil-impregnated tape layer to that of an insulation oil'(e ,/e, is limitedto 1-1.5, whereby stress on oil has been drastically reduced as compared with the conventional OF cables, and the voltage resistance of the entire cable has been improved.
  • FIGS. 2-(a) and 2-(b) show theresults of an impulse breakdown test on a sheet impregnated with an alkylbenzene oil.
  • FIG. 2-(a) shows that when an electrically insulating paper having high air-impermeability is integrated with a biaxially oriented polypropylene film, an increase in voltage resistance can be obtained. With an air-impermeability of 200 Gurley seconds, the voltage strength is considerably decreased, and for practical purposes, this is a minimum allowable value. Paper having an' air-impermeability lower than this value is unsuitable.
  • FIG. Z-(b) shows that when the insulating paper is provided on an oil layer surface facing the conductor, there is no polar effect. of impulse strength,
  • the insulation layer of a cable may be built by alternately winding a biaxially oriented polypropylene film and an electrically insulating paper, but since the polypropylene surface more frequently faces the conductor side in the oil layer, the voltage strength decreases for the abovementioned reason and the polar effect of the impulse becomes greater. This method is therefore not so preferred.
  • FIG. 3-(a) and '3-(b) are enlarged sectional views of the insulating layer produced according to this invention.
  • the reference numeral 1 represents a' copper or an impulse-breakdown strength test.
  • the results are shown in FIG. 4.
  • a I v It is seen fromthis figure that theimpuls e strength of this cable improved about 50 percent, over the conventional OFmodel cable. It can be concluded-from these results thatthe working. stress near the conductor can be increased to m 30 KV/mm, and there can be produced cables of the order of 1,000KV having a drastically reduced insulation thickness and being capable of being wound up on a drum.
  • the electric cables in which the polypropylene laminate paper of this invention is wound possess the characteristics of boththe plastic and insulating paper, and are free from creases which pose problems at the time of building a transmission system using the cables and have improved oil impregnating properties as well as improved electrical properties.
  • dielectric constant (6) can be easily controlled within 2.2-3.4, and the electric field can be relaxed by the difference in e of the insulation layer.
  • Improvement in voltage strength can be achieved since the ratioof the dielectric constant between the insulation tape layer and the insulationoil (gle approaches l and the voltage can be borne by the polypropylene laminate paper having highvoltage strength. Furthermore, the dielectric loss tangent of the cable can be maintained at 0.05 percent or less, which is considered to be difficult with an oil-impregnated paper,
  • An oil-impregnated electric power cable comprising an electrical conductor and insulation surrounding said conductor, at least a portion of said insulation comprising an electrically insulating polypropylenepaper laminate consisting of an integrated assembly selected from the group consisting of polypropylene and a propylene copolymer containing a major proportion of propylene units, the thickness of said adhesive being less than the thicknesses of each of said paper and said film and being as small as possible without substantially sacrificing the bond strength exhibited between said electrically insulating paper and said polypropylene film, said electrically insulating polypropylene-paper laminate having an electrically insulating oil impregnated therein.
  • propylene is non-hygroscopic.
US3775549D 1971-06-23 1972-06-23 Electrically insulating polyproplyene laminate paper and oil-impregnated electric power cable using said laminate paper Expired - Lifetime US3775549A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4547871A JPS5410712B1 (es) 1971-06-23 1971-06-23
JP5057271A JPS5133279B1 (es) 1971-07-08 1971-07-08

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862869A (en) * 1970-02-24 1975-01-28 Phillips Petroleum Co Method of making a reusable, tear-resistant polyolefin-paper laminate
US3996404A (en) * 1974-07-30 1976-12-07 Japan Vilene Company Ltd. Conjugate polycarbonate fibers and fibrous sheets made thereof
US4163080A (en) * 1977-04-13 1979-07-31 Societa' Italiana Resine S.I.R. S.P.A. Flexible double-layer polypropylene laminates for the packaging of food products
US4237334A (en) * 1977-08-06 1980-12-02 Showa Electric Wire & Cable Co., Ltd. Laminated insulating paper and oil-filled cable insulated thereby
US4329536A (en) * 1979-06-19 1982-05-11 Nippon Petrochemical Company, Ltd. Oil-impregnated power cable
US4481259A (en) * 1981-02-18 1984-11-06 Societa Cavi Pirelli S.P.A. Electric cable with insulation of biaxially oriented, polymeric tape with a coating of grease
US4487991A (en) * 1983-07-15 1984-12-11 The United States Of America As Represented By The United States Department Of Energy Fully synthetic taped insulation cables
US4536610A (en) * 1983-06-21 1985-08-20 Societa' Cavi Pirelli, S.P.A. Oil-filled, multi-core cable with at least one conductor differing from others
US4571357A (en) * 1983-02-11 1986-02-18 Sumitomo Electric Industries, Ltd. Electrically insulating laminate paper for oil-impregnated electric apparatus
US4675470A (en) * 1984-06-26 1987-06-23 Sumitomo Electric Industries Electric power cable
US4704170A (en) * 1984-01-17 1987-11-03 Societa' Cavi Pirelli S.P.A. Method of making an oil-filled electric cable with alternate layers of plastic and paper tape insulation
US4853490A (en) * 1985-11-08 1989-08-01 Societa' Cavi Pirelli S.P.A. Laminated paper-plastic insulating tape and cable including such tape
US4994632A (en) * 1988-10-21 1991-02-19 Societa' Cavi Pirelli S.P.A. Electric cable with laminated tape insulation
EP0684614A1 (en) 1994-05-24 1995-11-29 PIRELLI CAVI S.p.A. High voltage cable
US6207261B1 (en) 1996-11-18 2001-03-27 Tomoegawa Paper Co. Electrical insulating laminated paper, process for producing the same oil-impregnated power cable containing the same
US20050083160A1 (en) * 2003-10-15 2005-04-21 General Electric Company Insulation system for oil filled environments
EP2192600A1 (en) * 2007-08-27 2010-06-02 Sumitomo Electric Industries, Ltd. Process for producing submarine solid cable and submarine solid cable
US20170271046A1 (en) * 2016-03-15 2017-09-21 Commscope, Inc. Of North Carolina Multi-member cable with improved mid-span access
US11049631B2 (en) * 2017-02-16 2021-06-29 Ls Cable & System Ltd. Power cable

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PH16274A (en) * 1978-12-13 1983-08-26 Sumitomo Chemical Co Molded products of polypropylene
EP0116193B1 (en) * 1983-02-10 1986-05-07 Sumitomo Electric Industries Limited Electrically insulating laminate paper for oil-impregnated electric apparatus

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194872A (en) * 1963-04-23 1965-07-13 Gen Cable Corp Paper and polyolefin power cable insulation
US3370106A (en) * 1965-03-10 1968-02-20 Sun Oil Co Hot melt adhesive containing atactic polypropylene and polyethylene
US3380868A (en) * 1963-11-19 1968-04-30 Nat Distillers Chem Corp Method for producing and orienting polypropylene films
US3450968A (en) * 1965-11-18 1969-06-17 Gen Electric Electrical elements with impregnated dielectrics and insulators
US3497574A (en) * 1961-04-04 1970-02-24 Jack J Press Adhesive compositions
US3542717A (en) * 1967-03-08 1970-11-24 Geigy Chem Corp Adhesive compositions containing copolymers of alpha olefins having 11-20 carbon atoms and 4-20 carbon atoms and laminates formed therefrom
US3560227A (en) * 1968-01-17 1971-02-02 Dow Chemical Co High barrier coated papers comprising a film of resinous polyolefin and resinous barrier layer which is adhered to a paper substrate through an olefin adhesion promoting layer
US3594489A (en) * 1968-10-07 1971-07-20 Gen Cable Corp Extra high voltage cables
US3607987A (en) * 1967-07-20 1971-09-21 Phillips Petroleum Co Coating composition comprising polyethylene and a visbroken copolymer of ethylene and propylene
US3634546A (en) * 1967-04-05 1972-01-11 Eastman Kodak Co Crystalline and amorphous propylene polymer adhesive compositions
US3671383A (en) * 1967-11-04 1972-06-20 Mitsubishi Petrochemical Co Laminated biaxially oriented isotactic polypropylene and uniaxially oriented ethylene-propylene-films

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497574A (en) * 1961-04-04 1970-02-24 Jack J Press Adhesive compositions
US3194872A (en) * 1963-04-23 1965-07-13 Gen Cable Corp Paper and polyolefin power cable insulation
US3380868A (en) * 1963-11-19 1968-04-30 Nat Distillers Chem Corp Method for producing and orienting polypropylene films
US3370106A (en) * 1965-03-10 1968-02-20 Sun Oil Co Hot melt adhesive containing atactic polypropylene and polyethylene
US3450968A (en) * 1965-11-18 1969-06-17 Gen Electric Electrical elements with impregnated dielectrics and insulators
US3542717A (en) * 1967-03-08 1970-11-24 Geigy Chem Corp Adhesive compositions containing copolymers of alpha olefins having 11-20 carbon atoms and 4-20 carbon atoms and laminates formed therefrom
US3634546A (en) * 1967-04-05 1972-01-11 Eastman Kodak Co Crystalline and amorphous propylene polymer adhesive compositions
US3607987A (en) * 1967-07-20 1971-09-21 Phillips Petroleum Co Coating composition comprising polyethylene and a visbroken copolymer of ethylene and propylene
US3671383A (en) * 1967-11-04 1972-06-20 Mitsubishi Petrochemical Co Laminated biaxially oriented isotactic polypropylene and uniaxially oriented ethylene-propylene-films
US3560227A (en) * 1968-01-17 1971-02-02 Dow Chemical Co High barrier coated papers comprising a film of resinous polyolefin and resinous barrier layer which is adhered to a paper substrate through an olefin adhesion promoting layer
US3594489A (en) * 1968-10-07 1971-07-20 Gen Cable Corp Extra high voltage cables

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862869A (en) * 1970-02-24 1975-01-28 Phillips Petroleum Co Method of making a reusable, tear-resistant polyolefin-paper laminate
US3996404A (en) * 1974-07-30 1976-12-07 Japan Vilene Company Ltd. Conjugate polycarbonate fibers and fibrous sheets made thereof
US4163080A (en) * 1977-04-13 1979-07-31 Societa' Italiana Resine S.I.R. S.P.A. Flexible double-layer polypropylene laminates for the packaging of food products
US4237334A (en) * 1977-08-06 1980-12-02 Showa Electric Wire & Cable Co., Ltd. Laminated insulating paper and oil-filled cable insulated thereby
US4329536A (en) * 1979-06-19 1982-05-11 Nippon Petrochemical Company, Ltd. Oil-impregnated power cable
US4481259A (en) * 1981-02-18 1984-11-06 Societa Cavi Pirelli S.P.A. Electric cable with insulation of biaxially oriented, polymeric tape with a coating of grease
US4571357A (en) * 1983-02-11 1986-02-18 Sumitomo Electric Industries, Ltd. Electrically insulating laminate paper for oil-impregnated electric apparatus
US4536610A (en) * 1983-06-21 1985-08-20 Societa' Cavi Pirelli, S.P.A. Oil-filled, multi-core cable with at least one conductor differing from others
US4487991A (en) * 1983-07-15 1984-12-11 The United States Of America As Represented By The United States Department Of Energy Fully synthetic taped insulation cables
FR2549280A1 (fr) * 1983-07-15 1985-01-18 Us Energy Cables a isolation par rubans entierement synthetiques
US4704170A (en) * 1984-01-17 1987-11-03 Societa' Cavi Pirelli S.P.A. Method of making an oil-filled electric cable with alternate layers of plastic and paper tape insulation
US4675470A (en) * 1984-06-26 1987-06-23 Sumitomo Electric Industries Electric power cable
US4853490A (en) * 1985-11-08 1989-08-01 Societa' Cavi Pirelli S.P.A. Laminated paper-plastic insulating tape and cable including such tape
US4994632A (en) * 1988-10-21 1991-02-19 Societa' Cavi Pirelli S.P.A. Electric cable with laminated tape insulation
EP0684614A1 (en) 1994-05-24 1995-11-29 PIRELLI CAVI S.p.A. High voltage cable
US5850055A (en) * 1994-05-24 1998-12-15 Pirelli Cavi S.P.A. High voltage cable
US6207261B1 (en) 1996-11-18 2001-03-27 Tomoegawa Paper Co. Electrical insulating laminated paper, process for producing the same oil-impregnated power cable containing the same
US20050083160A1 (en) * 2003-10-15 2005-04-21 General Electric Company Insulation system for oil filled environments
EP2192600A1 (en) * 2007-08-27 2010-06-02 Sumitomo Electric Industries, Ltd. Process for producing submarine solid cable and submarine solid cable
EP2192600A4 (en) * 2007-08-27 2014-08-06 Sumitomo Electric Industries PROCESS FOR PRODUCING SOLID SUBMARINE CABLE AND SOLID SUB-MARINE CABLE
US20170271046A1 (en) * 2016-03-15 2017-09-21 Commscope, Inc. Of North Carolina Multi-member cable with improved mid-span access
US10600533B2 (en) * 2016-03-15 2020-03-24 Commscope, Inc. Of North Carolina Multi-member cable with improved mid-span access
US11049631B2 (en) * 2017-02-16 2021-06-29 Ls Cable & System Ltd. Power cable

Also Published As

Publication number Publication date
FR2143422A1 (es) 1973-02-02
GB1394893A (en) 1975-05-21
FR2143422B1 (es) 1977-12-23
IT958507B (it) 1973-10-30

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