EP0116754A1 - Câble électrique de puissance à haute tension avec accomodation lors d'une dilatation thermique - Google Patents

Câble électrique de puissance à haute tension avec accomodation lors d'une dilatation thermique Download PDF

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Publication number
EP0116754A1
EP0116754A1 EP19830307062 EP83307062A EP0116754A1 EP 0116754 A1 EP0116754 A1 EP 0116754A1 EP 19830307062 EP19830307062 EP 19830307062 EP 83307062 A EP83307062 A EP 83307062A EP 0116754 A1 EP0116754 A1 EP 0116754A1
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EP
European Patent Office
Prior art keywords
high voltage
power cable
electric power
voltage electric
cable according
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Withdrawn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
EP19830307062
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German (de)
English (en)
Inventor
Carlos Katz
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.)
Cable Technology Laboratories Inc
Original Assignee
Cable Technology Laboratories Inc
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 Cable Technology Laboratories Inc filed Critical Cable Technology Laboratories Inc
Publication of EP0116754A1 publication Critical patent/EP0116754A1/fr
Withdrawn legal-status Critical Current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
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/189—Radial force absorbing layers providing a cushioning effect
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame

Definitions

  • the present invention relates to high voltage electric power cables and, more particularly, to those cables having thick polymeric insulation.
  • a typical high voltage cable has a centrally located electrical conductor that is covered by a semiconducting conductor shield to smooth out the electric field that accompanies current flow through the conductor.
  • a semiconducting conductor shield Over the semiconducting conductor shield is applied the insulation having a thickness dependent ' upon the voltage rating of the cable, the higher the voltage rating the thicker the insulation.
  • another layer of semiconducting material is applied to provide a uniform equipotential electrically conducting surface.
  • the last mentioned layer of semiconducting material is augmented by a metallic member which typically is made of copper or lead. Collectively, the metallic member and the last mentioned semiconduting layer comprise an insulation shield.
  • the metallic member is often referred to as the metallic shield.
  • a protective jacket usually of polyethylene (PE), polyvinyl chloride (PVC) or other suitable material.
  • PE polyethylene
  • PVC polyvinyl chloride
  • the jacket provides mechanical and, to some extent, environmental protection to the cable core.
  • the usual method for producing the semiconducting conductor shield layer, the thick wall insulation layer, and the jacket is extrusion; hence, this cable is often referred to as an extruded type cable.
  • the condutive element can, in known manner, take the form of: a) copper wires applied in an open helix; b) helically applied copper tapes or strips; c) longitudinally applied, transversely corrugated, copper tapes having their edges overlapped; d) lead sheaths and, occasionally, e) relatively heavy extruded layers of corrugated aluminium or other metals. In the case of very small diameter low voltage cables, it is also known to employ flat longitudinally overlapped metal tapes.
  • any helically applied metal tape provides a passage for moisture between adjacent turns of the tape.
  • this type of shielding has application only in the lower voltage range of the high voltage cable art because it cannot accommodate the thermal expansion of the polymeric insulation system.
  • longitudinally applied and overlapped corrugated tapes permit passage of moisture through and along the overlap.
  • the volume coefficient of thermal expansion is 1.25x10 -3 cm3/cm3/oC for the range 25-82 0 C and 3.56x10 -3 cm 3 /cm 3 / o C for the range 83-125°C. Consequently, an increase in temperature from normal ambient of 25°C to the emergency temperature rating of a cable, i.e., 130°C, will produce a significant increase in the thickness of the insulation system which increase will exceed 10% of the wall thickness. It should be noted that for an extruded cable the volumetric expansion is concentrated primarily in the radial direction.
  • the lead sheath expands together with the cable core, but the lead does not contract when the temperature of the cable core decreases. Consequently, the inner part of the insulation shield (semiconducting layer) separates from the outer part (lead) reducing the points of contact between the layers to a minimum and giving rise to a condition which could lead to extensive damage upon exposure to a fault condition.
  • the present invention has for its object to permit the construction of high voltage cables with ratings as high as 345KV in which use can be made of hermetically sealed metallic shields of varied construction without having to be concerned about the problems discussed above.
  • the invention permits the use of inexpensive metal shields without risk of failure due to change in circumferential dimensions of the cable as it is subjected to high temperature.
  • a high voltage electric power cable adapted to withstand wide swings in temperature in which a thick layer of polymeric insulation material surrounds an electrically conductive core structure, and an insulation shield surrounds said layer of insulation material, characterized in that said insulation shield comprises an electrically conductive member having a smaller co-efficient of thermal expansion than said polymeric insulation material, and means interposed between said conductive member and said polymeric layer including a structurally resiliently compressible substantially shape recoverable element for adapting to any change in the radial dimension of the space between said conductive member and said layer of insulation material while maintaining engagement with the radially inner surface of said conductive member.
  • a typical cable construction embodying the present invention contains a bundle of conductive wires 10 forming an electrically conductive core structure.
  • a semiconducting conductor shield 11 over which is extruded the layer of insulation material 12 constituting the primary insulation for the cable.
  • an insulation shield consisting of a radially inner extruded semiconducting layer of semiconducting material 13 radially spaced from an outer metallic shield or member 14 between which is interposd a helically wrapped elongated strip 15 of compressible construction, the details of which will be described hereinafter.
  • Outside of the metallic shield layer 14 is the protective jacket 16.
  • the subassembly of the cable consisting of the conductors 10, the semiconducting shield 11 and the -primary insulation 12, along with the inner layer 13 of the insulation shield, can be constructed in any known manner by any of the methods described above by way of background information.
  • the insulation layer 12 is preferably formed from either polyethylene or crosslinked polyethylene.
  • the shield layer 14 is formed from longitudinally overlapped metal sealed at the overlap by suitable cement, epoxy, fusion weld or other means.
  • Figs. 3 to 24 illustrate a number of diverse shapes for the elongated element 15, all of which are susceptible of being wrapped around the cable core structure before application of metallic layer 14 and jacket 16.
  • the various elements are distinguished by reference numerals 15A to 15H and 15J to 15L. All of the elements illustrated in Figs. 3 to 24 have in common the ability to be wrapped around the cable in a continuous or intermittent pattern and to deform to fully absorb the radial change in dimensions of the cable core or substructure during thermal expansion without causing a significant change in the outer diameter of the metallic shield 14.
  • the choice of cross-section and material for the various elements 15 should be such as to preclude reduction of the radial dimension of the element when in place in the cable to less than 10% of its original magnitude.
  • the elements 15 Upon cooling of the cable permitting thermal contraction, the elements 15 must be capable of returning to their prior shape maintaining physical contact between the surface of the semiconducting layer 13 and the metallic layer 14 of the insulation shield.
  • the compressible elements 15 are constructed of either electrically conductive materials or incorporate electrically conductive members in order to provide an electrically conductive path between the elements 13 and 14 of the insulation shield.
  • the conductivity of the compressible elements should be at least 1 micromho per centimeter.
  • the dielectric constant should be at least 4. Whether to use semiconducting or high dielectric constant material for the compressible elements depends on which of these materials has been used for the insulation shield. However, it is also possible to combine the use of a semiconducting shield with a high dielectric constant compressible member.
  • the elements 15 can be made of the same semiconduting insulating or high dielectric constant materials as used in the cable core. Where insulating materials are used they can be made suitably semiconducting or conductive by the addition of appropriate semiconducting or conductive material to maintain the electric continuity between the extruded insulation shield 13 and the metallic shielding element 14. In the case of thermoset insulated cables, in order to withstand the high temperatures during, emergency operation, the elongated elements 15 should also be made of a thermoset type material. However, when the other elements of the cable are generally thermoplastic in nature, the compressible elements 15 may also be thermoplastic.
  • the elongated elements may be hollow such as those illustrated in Figs. 3 to 10.
  • the elements may be compartmentalized.
  • the element shown in Fig. 5 can be modified by incorporating longitudinally spaced transversely disposed webs 17 as shown in Figs. 11 and 12. Such webs will also modify the compressibility of the elongated element 15.
  • the compressible elements 15 may be flat on one side such as shown in Figs. 5 to 12 and 15 to 24.
  • the X-shape cross-section of the element 15F shown in Figs. 13 and 14, having spread legs or edges, will engage the underlying cylindrical surface of the cable in a manner similar to the flat surfaces shown in the other Figures.
  • Figs. ll and 12 besides illustrating a modification of the element 15B of Figs. 5 and 6, also show a distinct element in their own right. That is, instead of Fig. 11 representing a one half section of Fig. 5, Fig. 11 can be considered, ignoring the cross-hatching, as showing a complete element wherein the webs 17 only serve to modify the compression characteristics of the element and are not included to bar the passage of moisture.
  • Figs. 21 to 24 are composite in nature having a nonmetallic base portion 18 or 19 on which is mounted a metallic component 20 or 21 respectively.
  • the metallic component should be of such nature that it will provide the requisite compressibility with suitable resiliency to function as the absorbing element and at the same time can be conveniently embedded in the nonmetallic base 18 or 19.
  • the metallic element should be continuous throughout the length of the element in order to provide for electrical continuity. Thin narrow plates or wires made of phosphorous bronze have the good electrical condutivity and flexing characteristics required for use in the preferred embodiments.
  • Figs. 3 to 24 can be manufactured by any well-known method. While various of the embodiments are shown formed from plastic or other nonmetallic material, it is to be understood that metal may be substituted for the plastic in such configurations as that shown in Fig. 13 or Fig. 15, for example.
  • the conventional equipment utilized for applying shielding tapes over cable cores can be utilized either in its present form or slightly modified for the application of the compressible elements 15 over the cable insulation.
  • the spacing between adjacent turns of the element 15 will be determined by the nature of the metallic shield layer 14 and the minimum cable bending radius. Two or more elements 15 can be applied in parallel, if desired.
  • a flat metallic shield merely changes transverse shape.
  • the metallic shield i.e., the layer 14 may be made of plain copper or aluminium or from fused polymer-aluminium or similar material. If metal tapes are used they can be sealed longitudinally since no change in the overall circumferential dimensions need take place radially outwardly of the element 15. Low cost moisture impervious shielding materials that can be bonded together by cement rather than by welding can be utilized by virtue of the present invention.
  • the space between the adjacent turns can be filled by any of a number of materials of known compositions having highly absorbent characteristics.
  • absorbent material sometimes referred to as swelling powders
  • SGP water absorbent polymer sold under the trade designation "SGP" 502S by General Mills Chemicals, Inc. of Minneapolis, Minnesota.
  • SGP water absorbent polymer sold under the trade designation "SGP" 502S by General Mills Chemicals, Inc. of Minneapolis, Minnesota.
  • SGP water absorbent polymer sold under the trade designation "SGP" 502S by General Mills Chemicals, Inc. of Minneapolis, Minnesota.
  • Such swelling powders expand and swell to many times their original volume in the presence of water and thereby stop the flow of such water.
  • compressible foam like tapes could be used for this purpose.
  • the compressible element 15 are dictated by the cable core dependent upon the type insulation and thickness and by the characteristics of the element 15 as to its shape and material. For example, typical elements when used in a 138KV cable having an insulation wall thickness of 0.8 inches (2.032 cm) would have a height between 0.1 inch (0.254 cm) and 0.15 inch (0.381 cm) and a width between 0.2 inch (0.508 cm) and 0.25 inch (0.635 cm).
  • the present invention is embodied in a high voltage cable provided with one or more compressible or deformable elongated members wrapped helically around and over the extruded semiconducting shield in the same manner as shielding tapes have been wrapped helically over small cable cores.
  • the compression or deformation of the helically applied elements avoids the change in radial dimension of the metal shield layer and, consequently, allows for the use of a large number of hermetic relatively thin metal, shields such as inexpensive longitudinally overlapped metal shields which are not corrugated prior to their application and which can be sealed at their overlap by a relatively inexpensive cement, epoxy, weld or any other means.
EP19830307062 1983-02-11 1983-11-18 Câble électrique de puissance à haute tension avec accomodation lors d'une dilatation thermique Withdrawn EP0116754A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46580283A 1983-02-11 1983-02-11
US465802 1983-02-11

Publications (1)

Publication Number Publication Date
EP0116754A1 true EP0116754A1 (fr) 1984-08-29

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ID=23849211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830307062 Withdrawn EP0116754A1 (fr) 1983-02-11 1983-11-18 Câble électrique de puissance à haute tension avec accomodation lors d'une dilatation thermique

Country Status (4)

Country Link
EP (1) EP0116754A1 (fr)
JP (1) JPS59148210A (fr)
BR (1) BR8307059A (fr)
ES (1) ES8500501A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150879A2 (fr) * 1984-01-27 1985-08-07 Philips Patentverwaltung GmbH Câble à haute fréquence coaxial ininflammable
GB2329278A (en) * 1997-07-14 1999-03-17 Delta Crompton Cables Ltd Heat-resistant co-axial cable
WO1999033070A1 (fr) * 1997-12-22 1999-07-01 Pirelli Cavi E Sistemi S.P.A. Cable electrique comprenant une couche expansee etanche semi-conductrice
AU743935B2 (en) * 1997-12-22 2002-02-07 Prysmian Cavi E Sistemi Energia S.R.L. Electrical cable having a semiconductive water-blocking expanded layer
CN103594172A (zh) * 2013-10-27 2014-02-19 安徽蓝德集团股份有限公司 一种内外管空心弹性抗弯折控制电缆
WO2018122572A1 (fr) 2016-12-27 2018-07-05 Prysmian S.P.A. Câble électrique ayant une couche protectrice
EP3514805B1 (fr) * 2018-01-19 2022-11-09 Fanuc Corporation Câble
EP4293689A1 (fr) * 2022-06-13 2023-12-20 NKT HV Cables AB Procédé de fabrication d'un câble d'alimentation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6662919B2 (ja) 2018-01-19 2020-03-11 ファナック株式会社 ケーブル

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2732652A1 (de) * 1976-07-16 1978-01-19 Ericsson Telefon Ab L M Unterwasser-starkstromkabel mit einer leitenden abschirmung aus einem metallstreifen, der eine halbleitende schicht umgibt und mit dieser verklebt ist
FR2414245A1 (fr) * 1978-01-09 1979-08-03 Ceat Ste Fse Cable electrique non propagateur d'incendie
GB1551938A (en) * 1975-08-25 1979-09-05 Aeg Telefunken Kabelwerke System for transmitting electrical energy
EP0015369A1 (fr) * 1979-03-05 1980-09-17 kabelmetal electro GmbH Câble d'énergie électrique à isolation synthétique étanche à l'humidité, procédé pour sa fabrication et appareil pour la mise en oeuvre de ce procédé
US4225749A (en) * 1977-10-27 1980-09-30 Les Cables De Lyon Sealed power cable
DE2948651A1 (de) * 1979-12-04 1981-06-11 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Feuchtigkeitsgeschuetztes elektrisches kunststoffisoliertes energiekabel
FR2503441A1 (fr) * 1981-04-07 1982-10-08 Fabrication Cables Elect Cie G Nouveau cable electrique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5258890A (en) * 1975-11-11 1977-05-14 Hitachi Cable Ltd Power cable

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1551938A (en) * 1975-08-25 1979-09-05 Aeg Telefunken Kabelwerke System for transmitting electrical energy
DE2732652A1 (de) * 1976-07-16 1978-01-19 Ericsson Telefon Ab L M Unterwasser-starkstromkabel mit einer leitenden abschirmung aus einem metallstreifen, der eine halbleitende schicht umgibt und mit dieser verklebt ist
US4225749A (en) * 1977-10-27 1980-09-30 Les Cables De Lyon Sealed power cable
FR2414245A1 (fr) * 1978-01-09 1979-08-03 Ceat Ste Fse Cable electrique non propagateur d'incendie
EP0015369A1 (fr) * 1979-03-05 1980-09-17 kabelmetal electro GmbH Câble d'énergie électrique à isolation synthétique étanche à l'humidité, procédé pour sa fabrication et appareil pour la mise en oeuvre de ce procédé
DE2948651A1 (de) * 1979-12-04 1981-06-11 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Feuchtigkeitsgeschuetztes elektrisches kunststoffisoliertes energiekabel
FR2503441A1 (fr) * 1981-04-07 1982-10-08 Fabrication Cables Elect Cie G Nouveau cable electrique

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150879A2 (fr) * 1984-01-27 1985-08-07 Philips Patentverwaltung GmbH Câble à haute fréquence coaxial ininflammable
EP0150879A3 (en) * 1984-01-27 1988-09-21 Philips Patentverwaltung Gmbh Flame resistant coaxial high frequency cable
GB2329278A (en) * 1997-07-14 1999-03-17 Delta Crompton Cables Ltd Heat-resistant co-axial cable
GB2329278B (en) * 1997-07-14 2002-01-16 Delta Crompton Cables Ltd Co-axial cables
WO1999033070A1 (fr) * 1997-12-22 1999-07-01 Pirelli Cavi E Sistemi S.P.A. Cable electrique comprenant une couche expansee etanche semi-conductrice
AU743935B2 (en) * 1997-12-22 2002-02-07 Prysmian Cavi E Sistemi Energia S.R.L. Electrical cable having a semiconductive water-blocking expanded layer
US6455769B1 (en) 1997-12-22 2002-09-24 Pirelli Cavi E Sistemi S.P.A. Electrical cable having a semiconductive water-blocking expanded layer
CN103594172A (zh) * 2013-10-27 2014-02-19 安徽蓝德集团股份有限公司 一种内外管空心弹性抗弯折控制电缆
CN103594172B (zh) * 2013-10-27 2016-03-09 安徽蓝德集团股份有限公司 一种内外管空心弹性抗弯折控制电缆
WO2018122572A1 (fr) 2016-12-27 2018-07-05 Prysmian S.P.A. Câble électrique ayant une couche protectrice
EP3514805B1 (fr) * 2018-01-19 2022-11-09 Fanuc Corporation Câble
EP4293689A1 (fr) * 2022-06-13 2023-12-20 NKT HV Cables AB Procédé de fabrication d'un câble d'alimentation

Also Published As

Publication number Publication date
ES528055A0 (es) 1984-10-01
ES8500501A1 (es) 1984-10-01
BR8307059A (pt) 1984-11-13
JPS59148210A (ja) 1984-08-24

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Effective date: 19841112

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Inventor name: KATZ, CARLOS