EP0889485A1 - Papier stratifie en plastique isolant impregne d'huile, papier kraft utilise dans du papier stratifie et cable electrique realise au moyen de ce papier - Google Patents

Papier stratifie en plastique isolant impregne d'huile, papier kraft utilise dans du papier stratifie et cable electrique realise au moyen de ce papier Download PDF

Info

Publication number
EP0889485A1
EP0889485A1 EP96942664A EP96942664A EP0889485A1 EP 0889485 A1 EP0889485 A1 EP 0889485A1 EP 96942664 A EP96942664 A EP 96942664A EP 96942664 A EP96942664 A EP 96942664A EP 0889485 A1 EP0889485 A1 EP 0889485A1
Authority
EP
European Patent Office
Prior art keywords
paper
air permeability
kraft paper
layer
oil
Prior art date
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.)
Withdrawn
Application number
EP96942664A
Other languages
German (de)
English (en)
Other versions
EP0889485A4 (fr
Inventor
Tohru Takahashi
Hiroyuki Miyata
Kohichi Iinuma
Shotaro Yoshida
Ikuo Shigetoshi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikura Ltd
Original Assignee
Fujikura Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujikura Ltd filed Critical Fujikura Ltd
Publication of EP0889485A1 publication Critical patent/EP0889485A1/fr
Publication of EP0889485A4 publication Critical patent/EP0889485A4/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/06—Gas-pressure cables; Oil-pressure cables; Cables for use in conduits under fluid pressure
    • H01B9/0688—Features relating to the dielectric of oil-pressure cables
    • 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
    • H01B3/54—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 hard paper; hard fabrics
    • 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
    • H01B7/0208—Cables with several layers of insulating material
    • H01B7/0216—Two layers
    • 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
    • H01B7/0208—Cables with several layers of insulating material
    • H01B7/0225—Three or more layers

Definitions

  • the present invention relates to a plastic laminated paper for oil-impregnation insulation and used in an oil-impregnated insulator of an electrical cable such as an OF cable, a kraft paper used in the laminated paper and the electrical cable in which it is used.
  • the present invention increases in particular the adhesion strength of the kraft paper and a plastic film and improves the impulse breakdown character of the oil-impregnated insulator in which these are used.
  • this electrical cable is suitable for direct and alternating current transmission.
  • a polypropylene laminated paper As a plastic laminated paper forming an oil-impregnated insulator in an OF cable, at present, a polypropylene laminated paper wherein kraft papers are stuck to both surfaces of a polypropylene film is widely used. This is because this polypropylene laminated paper has superior dielectric and breakdown character compared to conventional kraft paper.
  • the fabrication method of the plastic laminated paper begins with extrusion of a melted plastic film from a T-die of an extruder. While in a melted state, both surfaces of this film are paralleled with kraft paper. After the adhesion by roller pressure, it is cooled and wound.
  • the plastic film and the kraft paper of the plastic laminated paper simply adhere to each other by the anchoring effect caused by the penetration of melted plastic into the fine roughness on the surface of the kraft paper, and generally the adhesion strength between the plastic film and the kraft paper is weak.
  • any means is necessary to increase the adhesion strength between the plastic film and the kraft paper without using the adhesive.
  • the plastic laminated paper made of the high air permeability kraft paper has a disadvantage that the dielectric breakdown character, in particular the impulse breakdown voltage, of the oil-impregnated insulator obtained from this plastic laminated paper deteriorates.
  • the oil-impregnated insulator comprising the plastic laminated paper is used in the oil-impregnated state.
  • the adhesion strength between the kraft paper and the plastic film is further remarkably weakened because of swelling of the plastic film due to oil absorption.
  • the adhesion strength decreases furthermore.
  • the object of the present invention to sufficiently increase the adhesion strength between the plastic film and the kraft paper of the plastic laminated paper which forms an oil-impregnated insulator such as an OF cable, and to increase the insulation breakdown character of the oil-impregnated insulator made of the plastic laminated paper.
  • the kraft paper for the plastic laminated paper of the present invention is a multi-ply paper comprising at least two layers of paper having different air permeability.
  • the air permeability of the low air permeability layer of this kraft paper is equal to or greater than 1000 Gurley seconds, preferably equal to or greater than 2000 Gurley seconds, on the other hand, the air permeability of the high air permeability layer of this kraft paper is equal to or less than 5000 Gurley seconds, preferably equal to or less than 2000 Gurley seconds, and even more preferably equal to or less than 20 Gurley seconds.
  • the low air permeability layer can be a high density layer, having the density exceeding 0.7 g/cm 3
  • the high air permeability layer can be a low density layer, having the density equal to or less than 0.7 g/cm 3 . It is desirable that the high density and low air permeability layer is a fourdrinier paper, and the low density and high air permeability layer is a cylindrical paper.
  • the thickness of the low air permeability layer is at least 15 ⁇ m, and the thickness of the high air permeability layer is at least 5 ⁇ m.
  • said multi-ply kraft paper is converted into the plastic laminated paper of the present invention by sticking the high air permeability layer of said multi-layer kraft paper onto a plastic film.
  • polypropylene film is preferable, and it is desirable that the polypropylene is homopolymer having the melt index of 5 ⁇ 50 g / 10 minutes.
  • the electrical cable of the present invention has an oil-impregnated insulator which is made by the wind of the plastic laminated paper and the oil-impregnation.
  • Fig. 1 shows a first example of the kraft paper of the present invention, and this example is a two-ply kraft paper comprising two layers 1a, 1b having different air permeability.
  • the first layer 1a is a high air permeability layer
  • the second layer 1b is a layer having the air permeability lower than that of the first high air permeability layer 1a.
  • the air permeability of the first high air permeability layer 1a is equal to or less than 5000 Gurley seconds, preferably equal to or less than 2000 Gurley seconds, and further preferably equal to or less than 20 Gurley seconds because the air permeability exceeding 5000 Gurley seconds gives the disadvantage such as the deterioration of adhesiveness with a plastic film.
  • the air permeability of the second low air permeability layer 1b is equal to or greater than 1000 Gurley seconds, preferably equal to or greater than 2000 Gurley seconds, and even more preferably equal to or greater than 4000 Gurley seconds because the air permeability less than 1000 Gurley seconds gives the disadvantage that the impulse breakdown voltage falls if the kraft paper is used in an oil-impregnated insulator.
  • the thickness of this two-ply kraft paper 1 is not limited in particular, but typically, it is in the range of 20 ⁇ 100 ⁇ m.
  • the thickness of the high air permeability layer is at least 5 ⁇ m, and preferably in the range of 5 ⁇ 30 ⁇ m.
  • the thickness of the low air permeability layer is at least 15 ⁇ m, and preferably in the range of 15 ⁇ 17 ⁇ m. If the thickness of the first layer 1a is less than 5 ⁇ m, the adhesion strength with the plastic film becomes insufficient, and if the thickness of the second layer 1b is less than 15 ⁇ m, the impulse breakdown voltage deteriorates.
  • each ratio of the thickness of the high air permeability layer 1a and the low air permeability layer 1b to the total thickness of the two-ply kraft paper 1 it is advantageous that the ratio of the high air permeability layer 1a is smaller than that of the low air permeability layer. This is because the area contributing to the adhesiveness is a relatively thin part under the surface, and if the roughness of the surface are large, sufficient adhesive strength can be attained. Further, this is because the thicker the low air permeability layer 1b becomes, the more the impulse breakdown character is improved.
  • a low loss paper bathed in deionized water which has good dielectric character is preferable, and a low conductive paper having the conductivity of aqueous extract equal to or less than 15 ⁇ S / cm (conforming to JIS-C-2111) is preferable.
  • Such the two-ply kraft paper 1 is manufactured by the way such as piling the fibrillized pulp of the paper fiber on top of the other in a dry or wet process using a fourdrinier or cylinder paper machine.
  • Fig. 2 shows the second example of the kraft paper of the present invention.
  • This kraft paper 11 is a three-ply kraft paper.
  • This three-ply kraft paper 11 comprises the high air permeability layer constituting the outer surfaces 11a and 11a and the low air permeability layer 11b therebetween.
  • the air permeability of the high air permeability layer of the outer surfaces 11a and 11a are equal to or less than 5000 Gurley seconds, preferably equal to or less than 2000 Gurley seconds and more preferably between 20 ⁇ 5000 Gurley seconds, and the air permeability of the low air permeability layer of the inner part 11b is equal to or greater than 1000 Gurley seconds, preferably equal to or greater than 4000 Gurley seconds and more preferably between 4000 ⁇ 2000 Gurley seconds.
  • the thickness of this three-ply kraft paper 11 is not limited in particular, but is typically in a range of 20 ⁇ 100 ⁇ m.
  • each ratio of the thickness of the high air permeability layer 11a and the low air permeability layer 11b to the total thickness of the three-ply kraft paper 11 it is advantageous that the ratio of the high air permeability layer 11a is smaller than that of the low air permeability layer. This is because the area contributing to the adhesiveness is a relatively thin part under the surface, and if the roughness of the surface are large, sufficient adhesive strength can be attained. Further, this is because the thicker the low air permeability layer 11b becomes, the more the impulse breakdown character is improved.
  • the thickness of the high air permeability layer 11a is at least 5 ⁇ m, preferably between 5 ⁇ 20 ⁇ m, and the thickness of the low air permeability layer 11b is at least 15 ⁇ m, preferably between 15 ⁇ 60 ⁇ m.
  • Fig. 3 shows the third example of the kraft paper of the present invention.
  • This kraft paper 21 is a two-ply kraft paper.
  • the first layer 21a is a high air permeability layer and the second layer 21b is a low air permeability layer.
  • the density of the first high air permeability layer 21a is equal to or less than 0.7 g / cm 3 , preferably equal to or less than 0.6 g / cm 3 , more preferably in the range of 0.6 ⁇ 0.5 g / cm 3 . If the density exceeds 0.7 g / cm 3 , the adhesiveness with the plastic film deteriorates and this becomes disadvantage.
  • the first high air permeability layer 21a is also a high air permeability layer which has the air permeability equal to or less than 2000 Gurley seconds, preferably equal to or less than 20 Gurley seconds.
  • the air permeability of the second low air permeability layer 21b is equal to or greater than 10000 Gurley seconds, preferably equal to or greater than 30000 Gurley seconds. If the air permeability is less than 10000 Gurley seconds, the impulse breakdown voltage deteriorates if it is used in an oil-impregnated insulator.
  • the second low air permeability layer 21b is also a high density layer which has the density over 0.7 g / cm 3 , preferably over 0.9 g / cm 3 .
  • the first high air permeability and low density layer 21a is a cylindrical paper manufactured by using a cylinder paper machine in a wet process
  • the second low air permeability and high density layer 21b is a fourdrinier paper manufactured by using a fourdrinier paper machine in a wet process.
  • the ratio of the thickness of the second and fourdrinier paper layer 21b to the first and cylindrical paper layer 21a is set about between 0.8 ⁇ 3.
  • the kraft paper of this example is laminated so that a plastic film and the first low density and high air permeability layer 21a are in contact with each other, and after the plastic laminated paper is made, it is cut into tapes, and the tape is wound. In these procedures, there is no breakage of the kraft paper when cutting is done, it is easy to wind, and further there is little difference between the vertical and the horizontal direction with regard to the tensile strength, stretching, Young's modulus and so on. Further, the kraft paper is not anisotropic but homogeneous, and has good adhesiveness with a plastic film. And, good impulse breakdown strength is expected if the kraft paper is used in an oil-impregnated insulator.
  • the kraft paper of the present invention can be a multi-ply kraft paper in which the high air permeability and the low air permeability layers are piled up over three layers.
  • at least one of the layers which is in contact with a plastic film should be the high air permeability layer having the air permeability equal to or less than 5000 Gurley seconds, preferably equal to or less than 2000 Gurley seconds, and more preferably 20 Gurley seconds.
  • the other layers should have the air permeability equal to or greater than 1000 Gurley seconds, preferably equal to or greater than 2000 Gurley seconds, and more preferably equal to or greater than 4000 Gurley seconds, which is selected so that their air permeability is lower than that of the high air permeability layer.
  • the plastic laminated paper of the present invention is the lamination of the above-described kraft paper and a plastic film. This laminating is carried out by the extrusion lamination method wherein a melted plastic film is extruded from a T-die of an extruder, and while the film is in a melted state, both or either surface of the film is paralleled with the kraft paper and put together by pressure rolls.
  • the high air permeability layer is always set to be in contact with the plastic film.
  • the check of the surface of the kraft paper is not necessary because both the outer surfaces 11a and 11a are high air permeability layers.
  • the first, low density and high air permeability layer 21a is set to be in contact with the plastic film.
  • the plastic film with thickness of 20 ⁇ 150 ⁇ m made from non-polar polyolefins such as polypropylene, poly-4-methylpentene-1, polybutene-1, polyethylene and so on, and fluorocarbon resin such as tetrafluoroethylene-hexafluoropropylene copolymer, ethylene-tetrafluoroethylene copolymer and so on, is used as the above plastic film.
  • non-polar polyolefins such as polypropylene, poly-4-methylpentene-1, polybutene-1, polyethylene and so on
  • fluorocarbon resin such as tetrafluoroethylene-hexafluoropropylene copolymer, ethylene-tetrafluoroethylene copolymer and so on
  • a film of polypropylene homopolymers preferably a film made from polypropylene homopolymer having comparative low melt viscosity such that melt index is between 5 ⁇ 50 g / minute, is desirable because it has high adhesiveness with the kraft paper, and good insulation character of the laminated paper which is obtained from the film is expected.
  • melt index of the polypropylene is less than 5, the melt viscosity at the time of extruding the melted polypropylene becomes large. Therefore, it becomes difficult for the resin to penetrate into the roughness of the surface of kraft paper, and the adhesive strength between the polypropylene film and the kraft paper deteriorates. If melt index exceeds 50, the melt viscosity becomes too small. Therefore, the back pressure at the time of extruding becomes unstable and the fluctuation of the thickness of the laminated paper becomes large.
  • polypropylene homopolymer have superior swelling character against insulation oil compared to copolymers such as random and block copolymer.
  • the thickness of the plastic laminated paper which is mentioned above is in the range of 100 ⁇ 300 ⁇ m. However, depending on the use and so on, it is not necessary to keep it within this range.
  • the adhesive strength becomes high because the melted plastic is easy to penetrate into the kraft paper, wherein the contacting layer to be laminated onto the plastic film is porous and has big roughness due to the low density of the layer.
  • the impulse breakdown strength when this plastic laminated paper is used in an oil-impregnated insulator becomes high because most of the other layers of the kraft paper are the high density layers.
  • the electrical cable of the present invention is made by impregnation of insulation oil such as polybutene and alkylbenzene oil into the insulator covered with a shielding layer, sheath, anti-corrosive layer and so on.
  • the insulator is made by the large number of wind of said plastic laminated paper onto a conductor directly or indirectly via a shielding layer.
  • MIND Mass Impregnated Non-Draining
  • the insulation character in particular the impulse breakdown strength, is good and the plastic laminated paper does not separate into the kraft paper and the plastic film when treating the cable, in which the insulator is exposed, at the time of connecting the cable.
  • the electrical cable of the present invention is suitable as a direct current cable or an alternating current cable in OF cable for transmission of extra/ultra high voltage.
  • Polypropylene homopolymer with the melt index of 15.0 g / minute (JIS K6758) and the density of 0.90 g / cm 3 was melted and extruded at 280°C for making a polypropylene film, and while in the melted state, both of the film surfaces were lined with the kraft paper having the density of 0.75 g / cm 3 and the thickness of 40 ⁇ m, and they were stuck together by pressure rolls to make a polypropylene laminated paper with the total thickness of 170 ⁇ m.
  • kraft paper a normal single layer paper or a two-ply paper, which was made from two layers having different air permeability and thickness of 20 ⁇ m, were used.
  • the high air permeability side was faced to the polypropylene film surface and the low air permeability side constituted the outer surface.
  • Polypropylene homopolymer with the melt index of 15.0 g / minute (JIS K6758) and the density of 0.90 g / cm 3 was melted and extruded at 280°C for making a polypropylene film, and while in the melted state, both of the film surfaces were lined with the two-ply kraft paper having the thickness of 40 ⁇ m, and they were stuck together by pressure rolls to make a polypropylene laminated paper with the total thickness of 170 ⁇ m.
  • the high air permeability layer was faced to the polypropylene film surface and the low air permeability layer constituted the outer surface.
  • Polypropylene homopolymer with the melt index of 15.0 g / minute (JIS K6758) and the density of 0.90 g / cm 3 was melted and extruded at 280°C for making a propylene film, and while in the melted state, both of the film surfaces were lined with the kraft paper having the density of 0.75 g / cm 3 and the thickness of 40 ⁇ m, and they were stuck together by pressure rolls to make a polypropylene laminated paper with the total thickness of 170 ⁇ m.
  • kraft paper a normal single layer paper or a two-ply paper which was made from layers having different thickness, and in which the air permeability of the high air permeability layer was equal to or less than 20 Gurley seconds and the air permeability of the low air permeability layer was equal to or greater than 20000 Gurley seconds, was used.
  • the high air permeability layer was faced to the polypropylene film surface and the low air permeability layer constituted the outer surface.
  • each polypropylene laminated paper was wound around a conductor to form an oil-impregnated insulator having the thickness of about 1 mm (JIS-C-2320, Type 2, Number 1 alkyl benzene oil was impregnated), and to form a model cable finally.
  • Each of the positive polarity impulse breakdown voltage of the model cable was measured. The results are shown in Fig. 3.
  • Fig. 3 Fig.
  • a polypropylene laminated paper was manufactured, and the adhesion strength and the positive polarity impulse breakdown voltage was measured like in Experimental Example 3 except that the kraft paper, wherein the thickness of the high air permeability layer was set to be 15 ⁇ m and the thickness of the low air permeability layer was set to be 25 ⁇ m, and the air permeability of each layer was changed, was used as the two-ply paper.
  • the results are shown in Fig. 4.
  • Polypropylene homopolymer with the melt index of 15.0 g / minute (JIS K6758) and the density of 0.90 g / cm 3 was melted and extruded at 280° C for making a polypropylene film, and while in the melted state, both of the film surfaces were lined with the kraft paper having the density 0.75 g / cm 3 and the thickness of 40 ⁇ m, and they were stuck together by pressure rolls to make a polypropylene laminated paper with the total thickness of 170 ⁇ m.
  • a three-ply paper having the total thickness of 45 ⁇ m which was made by sticking two sheets of the high air permeability paper having thickness of 15 ⁇ m on both surfaces of a low air permeability paper having the thickness of 15 ⁇ m and the density of 0.75 g / cm 3 , was used.
  • Polypropylene homopolymer with the melt index of 15.0 g / minute (JIS K6758) and the density of 0.90 g / cm 3 was melted and extruded at 280°C for making a propylene film, and while in the melted state, both of the film surfaces were lined with the two-ply kraft paper having the thickness of 40 ⁇ m and different layers in terms of the air permeability and the density, and they were stuck together by pressure rolls to make a polypropylene laminated paper with the total thickness of 170 ⁇ m.
  • the low density layer was faced to the polypropylene film surface and the low air permeability layer constituted the outer surface. The density of the low density layer and the air permeability of the low air permeability layer were changed.
  • the kraft paper consisted of a high air permeability layer (thickness of 10 ⁇ m), of which the air permeability is equal to or less than 20 Gurley seconds, and of a low air permeability layer (thickness of 30 ⁇ m), of which the air permeability is equal to or greater than 10000 Gurley seconds, was used. And, the high air permeability layer was stuck onto the polypropylene film.
  • the adhesion strength (180° exfoliation test) at the interface between the polypropylene film and the kraft paper of the obtained polypropylene laminated paper was measured. The results are shown in Fig. 7 Fig. 7 Experiment Number Melt Index of Polypropylene (g / 10 min) Adhesion Strength Comments 7 - 1 5 350 7 - 2 15 500 7 - 3 50 500 7 - 4 70 500 large thickness fluctuation 7 - 5 2 50
  • the OF cable in which the plastic laminated paper of the present invention is used has superior impulse breakdown character specially, and can be used as a high voltage or extra/ultra high voltage direct and alternating current transmission cable.
  • the adhesion strength between the kraft paper and the laminated paper is high, they are not separated even if the laminated paper tape is wound or the cable is connected to another, for example, and there is no deterioration of the operationality.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)
EP96942664A 1996-12-27 1996-12-27 Papier stratifie en plastique isolant impregne d'huile, papier kraft utilise dans du papier stratifie et cable electrique realise au moyen de ce papier Withdrawn EP0889485A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1996/003853 WO1998029878A1 (fr) 1996-12-27 1996-12-27 Papier stratifie en plastique isolant impregne d'huile, papier kraft utilise dans du papier stratifie et cable electrique realise au moyen de ce papier

Publications (2)

Publication Number Publication Date
EP0889485A1 true EP0889485A1 (fr) 1999-01-07
EP0889485A4 EP0889485A4 (fr) 2000-07-12

Family

ID=14154303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96942664A Withdrawn EP0889485A4 (fr) 1996-12-27 1996-12-27 Papier stratifie en plastique isolant impregne d'huile, papier kraft utilise dans du papier stratifie et cable electrique realise au moyen de ce papier

Country Status (2)

Country Link
EP (1) EP0889485A4 (fr)
WO (1) WO1998029878A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2075801A1 (fr) * 2007-12-27 2009-07-01 ABB Research Ltd. Matériel d'isolation électrique, dispositif électrique comportant ce matériel et transformateur

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0935562A (ja) * 1995-07-17 1997-02-07 Fujikura Ltd 油浸絶縁用ポリプロピレンラミネート紙およびこれを用いた電力ケーブル

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56130015A (en) * 1980-03-14 1981-10-12 Fujikura Ltd Low loss electric insulating material
JPS57134813A (en) * 1981-02-12 1982-08-20 Fujikura Ltd Laminated insulating tape
JPS58102418A (ja) * 1981-12-15 1983-06-18 東レ株式会社 油浸電気絶縁用積層フイルム
JPS59134503A (ja) * 1983-01-24 1984-08-02 古河電気工業株式会社 複合絶縁紙

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0935562A (ja) * 1995-07-17 1997-02-07 Fujikura Ltd 油浸絶縁用ポリプロピレンラミネート紙およびこれを用いた電力ケーブル

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 06, 30 June 1997 (1997-06-30) & JP 09 035562 A (FUJIKURA LTD), 7 February 1997 (1997-02-07) *
See also references of WO9829878A1 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2075801A1 (fr) * 2007-12-27 2009-07-01 ABB Research Ltd. Matériel d'isolation électrique, dispositif électrique comportant ce matériel et transformateur
WO2009083343A2 (fr) * 2007-12-27 2009-07-09 Abb Research Ltd. Matériau isolant électrique, dispositif électrique comprenant le matériau isolant et transformateur
WO2009083343A3 (fr) * 2007-12-27 2009-11-26 Abb Research Ltd. Matériau isolant électrique, dispositif électrique comprenant le matériau isolant et transformateur
US8178780B2 (en) 2007-12-27 2012-05-15 Abb Research Ltd. Electric insulation material, an electric device comprising the insulation material and a transformer
CN101911212B (zh) * 2007-12-27 2014-09-17 Abb研究有限公司 电绝缘材料、包括电绝缘材料的电气设备和变压器

Also Published As

Publication number Publication date
EP0889485A4 (fr) 2000-07-12
WO1998029878A1 (fr) 1998-07-09

Similar Documents

Publication Publication Date Title
EP0040067B1 (fr) Câble à triplaques
JPS6059605A (ja) 絶縁用ポリオレフィンラミネート紙の製造方法
US3775549A (en) Electrically insulating polyproplyene laminate paper and oil-impregnated electric power cable using said laminate paper
KR20020021643A (ko) 절연 전기 전도체
KR930002948B1 (ko) 전력 케이블
JP3437750B2 (ja) 電気絶縁用ラミネート紙の製造方法及び該ラミネート紙を用いた油浸電力ケーブル
US4853490A (en) Laminated paper-plastic insulating tape and cable including such tape
EP0889485A1 (fr) Papier stratifie en plastique isolant impregne d'huile, papier kraft utilise dans du papier stratifie et cable electrique realise au moyen de ce papier
JP3824724B2 (ja) 油浸絶縁用プラスチックラミネート紙およびこれを用いた電力ケーブル
JP3803139B2 (ja) 直流油浸電力ケーブル
JP3385142B2 (ja) 油浸絶縁用プラスチックラミネート紙、これに用いられるクラフト紙およびこれを用いた電力ケーブル
JPS6054732B2 (ja) 油浸絶縁用絶縁体
JPH10128917A (ja) 油浸絶縁用プラスチックラミネート紙
JP3573855B2 (ja) プラスチックケーブルの油浸端末の構造
JPH103819A (ja) 油浸絶縁用プラスチックラミネート紙
JPH0935562A (ja) 油浸絶縁用ポリプロピレンラミネート紙およびこれを用いた電力ケーブル
KR100465363B1 (ko) 전기절연적층지,이의제조방법및이를함유하는오일함침전력케이블
JP3973722B2 (ja) 直流油浸電力ケーブル
JP3746592B2 (ja) 絶縁用クラフト紙およびこれを用いたプラスチックラミネート紙ならびに油浸電力ケーブル
JPH09245548A (ja) 油浸絶縁用プラスチックラミネート紙
JPH1134272A (ja) プラスチックフィルムラミネート紙およびこれを用いた電力ケーブル
JPH0985904A (ja) 油浸絶縁用プラスチックラミネート紙およびこれを用いた電力ケーブル
JPS5925114A (ja) 絶縁用ポリプロピレンラミネ−ト紙
JPS6040985B2 (ja) 絶縁用ポリオレフィンラミネ−ト紙
JPH10248154A (ja) 油浸電力ケーブルの接続部

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19980821

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT SE

A4 Supplementary search report drawn up and despatched

Effective date: 20000529

AK Designated contracting states

Kind code of ref document: A4

Designated state(s): DE FR GB IT SE

RIC1 Information provided on ipc code assigned before grant

Free format text: 7H 01B 3/52 A, 7H 01B 3/54 B

17Q First examination report despatched

Effective date: 20031204

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20050701