EP1073067A1 - Elektrisches isoliertes Kabel und sein Herstellungsverfahren - Google Patents

Elektrisches isoliertes Kabel und sein Herstellungsverfahren Download PDF

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Publication number
EP1073067A1
EP1073067A1 EP00402094A EP00402094A EP1073067A1 EP 1073067 A1 EP1073067 A1 EP 1073067A1 EP 00402094 A EP00402094 A EP 00402094A EP 00402094 A EP00402094 A EP 00402094A EP 1073067 A1 EP1073067 A1 EP 1073067A1
Authority
EP
European Patent Office
Prior art keywords
aluminum
tube
cable according
conductor
cable
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.)
Ceased
Application number
EP00402094A
Other languages
English (en)
French (fr)
Inventor
Jean-François c/o SAGEM SA Lecoeuvre
Bertrand c/o SAGEM SA Ducroix
Patrick c/o SAGEM SA Sanchez
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.)
Silec Cable SAS
Original Assignee
Sagem 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 Sagem SA filed Critical Sagem SA
Publication of EP1073067A1 publication Critical patent/EP1073067A1/de
Ceased 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

Definitions

  • the present invention relates to buried electrical cables, intended mainly to medium and high voltage networks, which must remain watertight during long service lives, in the presence of aggressive agents.
  • the constitution of single-conductor cables of this type is usually that shown schematically in the figure.
  • the central conductor 10 is formed by a bundle of wires often wound in a helix, usually copper or aluminum, and is coated with a film 12 of conductive or semiconductor material intended in particular to render smooths the outer surface of the beam and reduce the spikes accordingly electric field.
  • a layer 14 of insulating material, generally polyethylene crosslinked with peroxide or silanes, covers the conductor-film assembly. She can be covered with a second film of semiconductor material 16.
  • the assembly thus constituted, often qualified as an electrical core, must be protected against moisture which may cause electrical trees.
  • a conductive tube 18 usually made of aluminum and generally having a a few hundred microns thick, which at the same time constitutes a screen electric.
  • This tube often consists of a strip or a folded or wound ribbon around the insulation with overlap of the edges and gluing, for example hot using a product qualified as a “hot melt” based on ethylene-vinyl acetate copolymer, says EVA, or using a polyester or polyamide resin.
  • a protective sheath mechanical 20 made of flexible insulating material, often polyvinyl chloride which combines good mechanical properties and resistance to cracking and good thermal aging behavior, is stuck on the screen.
  • a sealing powder is placed on the film 16 before fitting the tube.
  • Such cables are used in particular for medium voltage distribution, between 12 and 20 kV. In some countries, an additional conductive layer is provided above the sheath.
  • the long-term maintenance of the cable tightness is verified by tests on some samples.
  • a section of cable is immersed in an aqueous solution representative of the conditions of use in the presence of water.
  • the standard solution contains 10 g / l NaCl and 10 g / l Na2SO4 at a pH of 8.5. The test is carried out at 80 ° C.
  • GB 2043327 which describes a cable having a PVC sheath in contact with an inductor tube in aluminum, is interested in a thermomechanical problem.
  • the heart of the cable can cause thermal stress.
  • the problem is solved by having, under the metal screen, an insulator provided with longitudinal grooves for absorbing expansion of the isolated conductor. This prevents deformation of the screen-sheath assembly
  • the salts can in particular be derivatives of fatty acids such as stearates and oleates, the stabilizing effect of which can be enhanced by the presence of antioxidants, for example of the phenolic type.
  • Corrosion resistance is further increased if aluminum is subjected before constitution of the tube, passivation treatment.
  • anodic oxidation obtained by passing electric current between an anode consisting of aluminum to be protected and a cathode in a suitable electrolyte, destroys the natural oxide film, the thickness of which hardly exceeds 10 nm, and makes it grow a more resistant and more adherent anodic coating which can reach a thickness about 50 nm if the oxide is not porous and can go beyond if not.
  • Such a thick coating is more resistant to abrasion and corrosion than film natural alumina.
  • An anodically oxidized layer whose thickness is included between 20 and 50 nm is sufficient to significantly improve the corrosion resistance. In general we will not exceed 200 nm.
  • a coating obtained by chromatography in an electrolytic acid bath diluted chromic offers the same benefits.
  • passivation has mainly a interest on the face in contact with the sheath, it will generally be practiced simultaneously on both sides of the strip or ribbon.
  • the invention is also applicable to multipolar cables comprising a common mechanical protection sheath which contains several conductors fitted each of their own aluminum conductor tube.
  • the screen may surround all drivers.
  • the invention also provides a method of manufacturing an insulated cable, according to claim 10.
  • the second layer is advantageously coated with a sealing powder of cellulosic nature (for example a carboxymethylcellulose) before placing the tube.
  • a sealing powder of cellulosic nature for example a carboxymethylcellulose
  • the tube is sealed by edge-to-edge bonding and / or by welding crossing.
  • edge-to-edge bonding and / or by welding crossing.
  • the cable After 3000 hours of immersion at 80 ° C, the cable, once split, was examined. The examination showed that the tube has several perforations, destroying cable tightness. Examination of the sheath side, after detaching the tape metallic sheath, showed pitting corrosion.
  • a section of cable having the same constitution as that of Example 2 was manufactured, but replacing the lead-containing stabilizer with a stabilizer calcium-zinc, namely Reapack CV B 3003.
  • the same corrosion test as previously did not reveal any trace of attack on the inner side of the cable; the face outside of the aluminum tube showed no signs of corrosion, even when microscope.
  • the salts which can be used as stabilizers are very diverse in nature. They may in particular be calcium / zinc salts, magnesium and aluminum acid bold.
  • the fillers may contain silica instead of chalk.
  • the surface passivation of aluminum can be obtained not only by anodization or by phosphating, but also by mixed treatments leading to production of two superimposed layers, for example by chromation followed by phosphating.

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  • Manufacturing Of Electric Cables (AREA)
  • Insulated Conductors (AREA)
EP00402094A 1999-07-26 2000-07-21 Elektrisches isoliertes Kabel und sein Herstellungsverfahren Ceased EP1073067A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9909681A FR2797088B1 (fr) 1999-07-26 1999-07-26 Cable electrique isole et procede de fabrication d'un tel cable
FR9909681 1999-07-26

Publications (1)

Publication Number Publication Date
EP1073067A1 true EP1073067A1 (de) 2001-01-31

Family

ID=9548519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00402094A Ceased EP1073067A1 (de) 1999-07-26 2000-07-21 Elektrisches isoliertes Kabel und sein Herstellungsverfahren

Country Status (2)

Country Link
EP (1) EP1073067A1 (de)
FR (1) FR2797088B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112006001439B4 (de) * 2005-06-03 2016-02-11 Hitachi Cable America Inc. Verlegbare Leiteranordnung, Verwendung derselben beim Elektroenergietransport und Verfahren zum Produzieren einer verlegbaren Leiteranordnung
EP3057102A1 (de) 2015-02-12 2016-08-17 Nexans Transportkabel für elektrische energie aus aluminium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2043327A (en) * 1978-11-14 1980-10-01 Jeumont Schneider Longitudinal sealing of electric cables
EP0838493A1 (de) * 1996-10-23 1998-04-29 Bärlocher GmbH Stabilisatorkombination für Kabelummantelungen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2043327A (en) * 1978-11-14 1980-10-01 Jeumont Schneider Longitudinal sealing of electric cables
EP0838493A1 (de) * 1996-10-23 1998-04-29 Bärlocher GmbH Stabilisatorkombination für Kabelummantelungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ROGER E. BARRAS ET AL.: "A New Era in Cable Designs and Materials to Resolve Environmental Issues", IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, vol. 33, no. 5, October 1997 (1997-10-01), pages 1321 - 1330, XP011022256 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112006001439B4 (de) * 2005-06-03 2016-02-11 Hitachi Cable America Inc. Verlegbare Leiteranordnung, Verwendung derselben beim Elektroenergietransport und Verfahren zum Produzieren einer verlegbaren Leiteranordnung
EP3057102A1 (de) 2015-02-12 2016-08-17 Nexans Transportkabel für elektrische energie aus aluminium
FR3032830A1 (fr) * 2015-02-12 2016-08-19 Nexans Cable de transport d'energie electrique en aluminium

Also Published As

Publication number Publication date
FR2797088A1 (fr) 2001-02-02
FR2797088B1 (fr) 2002-01-18

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