EP0707322A1 - Energiekabel - Google Patents

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Publication number
EP0707322A1
EP0707322A1 EP95402222A EP95402222A EP0707322A1 EP 0707322 A1 EP0707322 A1 EP 0707322A1 EP 95402222 A EP95402222 A EP 95402222A EP 95402222 A EP95402222 A EP 95402222A EP 0707322 A1 EP0707322 A1 EP 0707322A1
Authority
EP
European Patent Office
Prior art keywords
cable according
screen
cable
metal screen
insulation
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Withdrawn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
EP95402222A
Other languages
English (en)
French (fr)
Inventor
Dominique Brouard
Patrick Dubots
Pierre Mirebeau
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.)
Nexans France SAS
Original Assignee
Alcatel Cable SA
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 Alcatel Cable SA filed Critical Alcatel Cable SA
Publication of EP0707322A1 publication Critical patent/EP0707322A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/022—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of longitudinal lapped tape-conductors
    • 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
    • H01B9/023—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of helicoidally wound tape-conductors

Definitions

  • the present invention relates to a power cable and in particular a cable for medium and high voltages, for land or underwater applications.
  • Cables of this type, single conductor include coaxially, the central conductor, an internal semiconductor screen (optional), the insulation, an external semiconductor screen (optional) and a protective sheath.
  • a metallic screen is added to it, between the external semiconductor screen and the sheath, which has at least two roles: an electrical screen role (routing of leakage or overload currents and grounding) and a role waterproof screen. In its role of earthing, the metal screen must be in electrical contact with the underlying semiconductor screen.
  • Metallic screens can also be found in patent documents FR-A-2134175 and EP-A-0317023, but their purpose is not to ensure moisture resistance.
  • One is found in the document FR-A-2365188, serving as a seal against humidity, but the problem of the effects of differential thermal expansion is not even mentioned there.
  • That of document FR-A-2168959, finally, is free to move relative to the insulating sheath, which is similar to that which we have just mentioned in the previous paragraph.
  • the metal screen can also receive a plastic coating on its face facing the core of the cable.
  • This coating will generally be semiconductor. The functions of this coating are then to control the electric field, to provide electrical contact with an external semiconductor screen and to protect the surface of the metal screen, in the event of moisture entering.
  • the present invention relates to a cable in which one dispenses with such an intermediate lining, which provides a significant saving of material, but also a reduction in weight and size of the cable.
  • the power cable for medium and high voltages of the invention therefore comprises at least, coaxially, a central conductor, an insulator, a metal screen coated with a plastic material on its side facing the core, ensuring, among other things, moisture resistance, and a protective sheath. It is further characterized in that said plastic material is such that said metal screen is intimately bonded to the underlying material of the insulation or of any additional layer intimately linked to the insulation.
  • Said plastic material may also be semiconductor, in particular when said underlying material will comprise a semiconductor screen.
  • said material may be cellular, with closed cells, so as to have a reduced hydrostatic pressure coefficient while opposing the longitudinal progression of humidity.
  • the metal screen may be made of copper, aluminum or lead. It will advantageously be made of a material supplied in sheet and tape or laid lengthwise and rolled on the cable.
  • the radial seal will preferably be provided by welding the edges of the sheet to one another. According to a particularly advantageous embodiment, this welding will be carried out by laser.
  • a CO2 laser can thus be advantageously used to weld one to the other, continuously and at the rate of several meters per minute, the edges of an aluminum sheet of 0.2 to 1 mm.
  • the two cables comprise a central conductor 1, an internal semiconductor screen 2, an insulator 3, an external semiconductor screen 4, a metal screen 5 and a sheath 6.
  • the two semiconductor screens are optional. They can be individually omitted in certain applications.
  • the nature and role of each of the constituent elements of these two cables are well established in the technique which is the subject of an abundant literature. We will refer in particular to the two publications mentioned at the beginning of this text. It is therefore not necessary to describe them further.
  • the external semiconductor screen 4 when it exists, must be intimately linked to the insulation 3.
  • the known technique indicates that this result can be obtained simply by extruding the same material as that on the insulation. insulation, properly loaded so that it has the required semiconductor qualities.
  • the metal screen 5 is a copper foil 7 wound in a spiral, that is to say tape, on the surface of the semiconductor screen 4, so that the turns be joined.
  • the screen metal 4 thus forms a continuous tube.
  • the axial electrical continuity and the hygrometric seal are obtained by welding the joint between the turns.
  • the conventional technique provides different methods of welding.
  • the metal screen 5 is an aluminum sheet 8 rolled so that its edges overlap axially at 9.
  • the electrical and hygrometric sealing is again obtained by welding the overlapping joint.
  • the welding is carried out using a CO2 laser, the beam of which is focused a few tenths of a millimeter above the joint.
  • a 1000 W laser can thus weld the two edges of a 0.3 mm thick aluminum sheet to each other, at a rate of 10 m per minute.
  • This material can be loaded with carbon black and / or cellular beads to give it the desired semiconductor and / or compressibility properties.
  • Measurements carried out in accordance with annex C of standard NFC 33-223 indicates that a peeling force of at least 20 N / 15 mm is commonly obtained, which guarantees the desired result of a distribution of the stresses between the cable insulation and the elements covering it.

Landscapes

  • Insulated Conductors (AREA)
EP95402222A 1994-10-11 1995-10-05 Energiekabel Withdrawn EP0707322A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9412111A FR2725555B1 (fr) 1994-10-11 1994-10-11 Cable de puissance
FR9412111 1994-10-11

Publications (1)

Publication Number Publication Date
EP0707322A1 true EP0707322A1 (de) 1996-04-17

Family

ID=9467744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402222A Withdrawn EP0707322A1 (de) 1994-10-11 1995-10-05 Energiekabel

Country Status (4)

Country Link
EP (1) EP0707322A1 (de)
JP (1) JPH08115620A (de)
CA (1) CA2160064A1 (de)
FR (1) FR2725555B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004053896A1 (en) * 2002-12-11 2004-06-24 Pirelli & C. S.P.A. Electrical cable with foamed semiconductive insulation shield
US7208682B2 (en) 2002-12-11 2007-04-24 Prysmian Cavi E Sistemi Energia Srl Electrical cable with foamed semiconductive insulation shield

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2312591B1 (de) * 2009-08-31 2020-03-04 Nexans Ermüdungsbeständige metallische Feuchtigkeitsabschirmung für ein Unterseestromkabel
FR3006496B1 (fr) * 2013-06-04 2017-02-17 Soc Nat Des Chemins De Fer Francais Sncf Cable electrique pour l'attenuation de courants harmoniques et equipement muni d'un tel cable

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2134175A3 (de) * 1971-04-23 1972-12-08 Cables De Lyon Geoffroy Delore
FR2168959A1 (en) * 1972-01-28 1973-09-07 Gen Cable Corp Cable electrostatic shield - for high voltage of lengthwise folded metal strip over semiconductor layer
FR2365188A1 (fr) * 1976-09-15 1978-04-14 Asea Ab Cable pour courants forts
EP0317023A2 (de) * 1987-11-20 1989-05-24 Philips Patentverwaltung GmbH Elektrischer Leiter mit einer Leiterglättungsschicht

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2134175A3 (de) * 1971-04-23 1972-12-08 Cables De Lyon Geoffroy Delore
FR2168959A1 (en) * 1972-01-28 1973-09-07 Gen Cable Corp Cable electrostatic shield - for high voltage of lengthwise folded metal strip over semiconductor layer
FR2365188A1 (fr) * 1976-09-15 1978-04-14 Asea Ab Cable pour courants forts
EP0317023A2 (de) * 1987-11-20 1989-05-24 Philips Patentverwaltung GmbH Elektrischer Leiter mit einer Leiterglättungsschicht

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004053896A1 (en) * 2002-12-11 2004-06-24 Pirelli & C. S.P.A. Electrical cable with foamed semiconductive insulation shield
US7208682B2 (en) 2002-12-11 2007-04-24 Prysmian Cavi E Sistemi Energia Srl Electrical cable with foamed semiconductive insulation shield

Also Published As

Publication number Publication date
JPH08115620A (ja) 1996-05-07
CA2160064A1 (en) 1996-04-12
FR2725555A1 (fr) 1996-04-12
FR2725555B1 (fr) 1996-11-22

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