EP1816656B1 - Korrosionsgeschütztes elektrisches Kabel - Google Patents

Korrosionsgeschütztes elektrisches Kabel Download PDF

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Publication number
EP1816656B1
EP1816656B1 EP20070300763 EP07300763A EP1816656B1 EP 1816656 B1 EP1816656 B1 EP 1816656B1 EP 20070300763 EP20070300763 EP 20070300763 EP 07300763 A EP07300763 A EP 07300763A EP 1816656 B1 EP1816656 B1 EP 1816656B1
Authority
EP
European Patent Office
Prior art keywords
neutral conductor
conductor
screen
metal
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.)
Not-in-force
Application number
EP20070300763
Other languages
English (en)
French (fr)
Other versions
EP1816656A2 (de
EP1816656A3 (de
Inventor
Sophie Wasiuta
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 SA
Original Assignee
Nexans 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 Nexans SA filed Critical Nexans SA
Publication of EP1816656A2 publication Critical patent/EP1816656A2/de
Publication of EP1816656A3 publication Critical patent/EP1816656A3/de
Application granted granted Critical
Publication of EP1816656B1 publication Critical patent/EP1816656B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01B9/028—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients with screen grounding means, e.g. drain wires

Definitions

  • the present invention relates to a cable for the transmission of electricity comprising a neutral conductor for grounding through a screen.
  • Each phase or neutral conductor is made of one or more electrically conductive wires.
  • Each of the phase conductors comprises an insulating envelope surrounding the son or son.
  • the neutral conductor does not have an insulating envelope.
  • a metal screen surrounds the live and neutral conductors. This screen touches the neutral conductor (not insulated) over most of its length and is therefore in electrical contact with the neutral conductor.
  • the screen, and therefore also the neutral conductor is connected to a reference potential, usually the potential of the earth for grounding.
  • a protective sheath generally of synthetic material surrounds the screen.
  • Grounding the screen and the neutral conductor provides good protection for third parties who come into contact with the cable.
  • These cables can indeed be buried and, during work, the accidental contact of an electrically conductive tool with the cable is not excluded. Bodily injuries, which can be fatal, are therefore to be feared. It is therefore essential to ensure an excellent grounding of these cables and thus to design a particularly effective neutral screen-conductive system.
  • the screen must be mechanically strong so as not to be accidentally punctured or broken.
  • the cables must also resist corrosion due to the environment that can be polluted.
  • the pollution may be that of the air in the rope lifts or that of the earth when the cable is buried.
  • Corrosion can also be initiated by the entry of liquid into the cable (water for example) and associated with the metals constituting the driver neutral and the screen when these metals have relatively different electrochemical potentials form what is called a stack effect if for example the network is not electrically balanced or it remains a residual current in the neutral.
  • the screen - neutral conductor system must also be reliable and have a long service life.
  • the metal usually used for drivers is aluminum.
  • this metal naturally oxidizes in contact with the air to form a layer of alumina around the neutral conductor.
  • Alumina is relatively poor conductor of electricity, it limits its formation by depositing a layer of lead around the neutral conductor aluminum so as to ensure good electrical contact between the neutral conductor and the screen and provide protection complementary with respect to corrosion.
  • lead because of the toxicity of lead, it is desirable to no longer use this metal, nor any other heavy metal whose use is regulated.
  • the patent US 4,025,715 describes a solution for the protection of neutral aluminum conductors.
  • This solution consists in coating the aluminum conductors with a semiconductor material loaded with fine particles of carbon black.
  • the coating can be carried out by conventional extrusion or molding processes using a plastic substance based on polymers loaded with carbon black particles.
  • the patent document EP 0 093 031 describes an electrical cable whose screen can be constituted by aluminum strips and the neutral conductor is also made of aluminum.
  • a sealing material for example a moisture swellable powder, introduced between the conductors provides protection against the longitudinal propagation of moisture and thereby protects against corrosion.
  • the present invention provides an electrical cable that reduces the risk of electrocution to people and animals through efficient, reliable and corrosion-resistant grounding. Heavy metals, such as lead, to protect the neutral conductor when it is aluminum are not used, thus avoiding possible pollution of the environment. In addition, the neutral conductor of this cable is protected from corrosion.
  • the invention relates to a cable for the transmission of electricity of the type comprising at least one insulated phase conductor, a neutral conductor and a screen, the screen surrounding the phase conductor and the neutral conductor and being intended to be connected to a reference potential, a part of the neutral conductor being in contact with a part of the screen.
  • the said parts consist of a material based on the same electrically conductive metal.
  • the neutral conductor and the screen are both coated with a coating based on said same electrically conductive metal.
  • the neutral conductor is zinc-coated aluminum and the screen is made of a metal material covered with a zinc coating.
  • Said coating may for example be a film obtained by cold deposition of a polymerizable mixture composed of an organic binder and pigments of said same electrically conductive metal.
  • the mixture preferably comprises at least 90% by volume of pigments of said metal.
  • Said coating may alternatively be a layer of said electrodeposited metal.
  • the screen is in the form of a ribbon placed around the phase conductor and the neutral conductor.
  • the cable comprises three isolated phase conductors, the screen surrounding the phase conductors and the neutral conductor.
  • phase and neutral conductors may for example be of cross section, cylindrical or sectoral.
  • the cable 10 shown schematically in cross section, is for the transport of low voltage three-phase electricity.
  • This cable comprises three identical phase conductors 12, 14 and 16. Each of them is formed of a single wire or several stranded son surrounded by an insulating envelope respectively 18, 20 and 22.
  • the metal wires may be for example aluminum or copper.
  • the cable also comprises a neutral conductor 24 consisting of one or more wire (s) metal (s) which is preferably aluminum.
  • wire (s) metal (s) which is preferably aluminum.
  • aluminum has the advantage of being relatively good conductor of electricity, lighter and cheaper than copper. However, it has the disadvantage of oxidizing the surface to form a relatively insulating alumina layer. In order to prevent this oxidation and possible corrosion, a thin layer 26 of a conductive material is deposited around the neutral conductor 24.
  • the phase conductors 12, 14 and 16 and the neutral conductor 24 are assembled together.
  • a metal screen 28 envelops the assembly consisting of the four conductors over their entire length.
  • This screen can be formed for example by a strip in the form of a conductive strip around the four conductors along their entire length.
  • the screen is in contact with a portion 30 of the conductive layer 26 of the neutral conductor 24.
  • the latter connected with the phase conductors and the screen 26 forming a set relatively cylindrical, the parts 30 in contact with the screen and the neutral conductor are constituted by a generatrix of helical or longitudinal shape respectively of the screen and the neutral conductor.
  • the screen 28 is intended to be connected to a reference potential which is usually the potential of the earth so as to ground the screen.
  • the neutral conductor 24, being in contact with the screen is also connected to this reference potential.
  • a protective sheath 32 of synthetic material, surrounds the screen 28 over its entire length.
  • the screen and the neutral conductor can then be made of a conductive material based on the same metal.
  • the latter could be for example copper, or another metal.
  • the screen 28 is generally a metal strip covered with a layer 34 usually made of zinc.
  • the conductors are preferably aluminum, the neutral conductor being covered with a protective metal layer, usually lead.
  • the lead layer is replaced by a layer of zinc.
  • a screen 28 protected by galvanization, of cylindrical shape the inner portion 30 in contact with the neutral conductor is covered with a zinc layer 34 and a neutral conductor 24 of aluminum covered with a zinc layer 26.
  • the parts in contact 30 are therefore of the same metal, zinc. This results in a relatively simple metallurgical system for chemical potentials since only the chemical potential of aluminum, zinc and the metal constituting the screen is available.
  • the zinc layer can be deposited on the aluminum in various ways. Deposition can be done for example cold by soaking the neutral conductor in a solution consisting of a hydrocarbon-based organic binder in a small proportion and a majority of conductive pigments (or fine metal particles) of zinc. Preferably the solution contains at least 90% by volume of zinc. Deposition can also be done by spraying the solution on aluminum. The film thus deposited on the neutral aluminum conductor is then polymerized, for example by exposing it to moisture and / or UV rays at room temperature. The film obtained is of small thickness, of the order of ten micrometers.
  • Deposition of the zinc thin layer may alternatively be carried out by electrolysis of a zinc-based solution. Layer thicknesses of the order of ten micrometers are also obtained, with a degree of purity of zinc of greater than 99.99%.
  • Deposition by dipping, vaporization or electrolysis provides a thin layer of zinc good conductor of electricity and having interesting mechanical deformation properties. Indeed, winding tests have shown that the neutral conductor can be wound with a winding diameter substantially equal to five times its own diameter in one winding direction and then in the other direction without damage, especially without cracking, for the zinc layer.
  • the invention proposes a new solution which makes it possible to produce electrical cables resistant to corrosion and which provide good protection against the risks of accidental electrocution by a reliable grounding.
  • the elimination of lead, and usually heavy metals, does not pollute the environment.
  • the embodiment comprising a ferrous metallic screen covered with a zinc layer and a neutral aluminum conductor covered with a zinc layer makes it possible to preserve the advantages provided by the aluminum conductors (lightness, reduction of costs) and metal screens pre-defined (good mechanical strength) while improving corrosion resistance and grounding.
  • the screen could consist of a non-ferrous ribbon for example aluminum covered with a layer of zinc.
  • the phase and neutral conductors which have just been described have a substantially circular shape in cross section. According to another embodiment, they could of course be constituted by conductors called "sectoral", each conductor having in cross section the shape of a sector. In this case, the phase conductors are substantially identical (the conductors having in cross section substantially the same shape and the same surface), while the neutral conductor is generally, but not necessarily, of smaller section.

Landscapes

  • Insulated Conductors (AREA)

Claims (7)

  1. Kabel für den Transport von Elektrizität des Typs, der mindestens einen isolierten Phasenleiter (12, 14, 16), einen neutralen Leiter (24) und eine Abschirmung (28) umfasst, wobei die Abschirmung den Phasenleiter und den neutralen Leiter umgibt und bestimmt ist, mit einem Referenzpotential verbunden zu sein, wobei ein Teil des neutralen Leiters im Kontakt mit einem Abschnitt der Abschirmung ist, wobei die Abschnitte (30) aus einem Material auf der Basis eines selben elektrisch leitenden Material bestehen, wobei das Kabel dadurch gekennzeichnet ist, dass alle beide, der neutrale Leiter (24) und die Abschirmung (28), mit einer Beschichtung (26, 34) auf der Basis desselben elektrisch leitenden Metalls bedeckt sind.
  2. Kabel nach vorangehendem Anspruch, dadurch gekennzeichnet, dass das elektrisch leitende Material Zink ist.
  3. Kabel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Beschichtung ein Film ist, der durch Kaltablagerung eines polymerisierbaren Gemischs hergestellt ist, das sich aus einem organischen Bindemittel und Pigmenten desselben elektrisch leitenden Metalls zusammensetzt.
  4. Kabel nach Anspruch 3, dadurch gekennzeichnet, dass das Gemisch mindestens 90 Vol. % Pigmente des Metalls aufweist.
  5. Kabel nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Beschichtung eine Schicht des durch Elektrolyse aufgebrachten Metalls ist.
  6. Kabel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Abschirmung (28) in Form eines Bands ist, das um den Phasenleiter (12, 14, 16) und den neutralen Leiter (24) aufgebracht ist.
  7. Kabel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass es drei isolierte Phasenleiter (12, 14, 16) aufweist, wobei die Abschirmung (28) die Phasenleiter und den neutralen Leiter (24) umgibt.
EP20070300763 2006-02-03 2007-02-01 Korrosionsgeschütztes elektrisches Kabel Not-in-force EP1816656B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0650386A FR2897194B1 (fr) 2006-02-03 2006-02-03 Cable electrique protege contre la corrosion

Publications (3)

Publication Number Publication Date
EP1816656A2 EP1816656A2 (de) 2007-08-08
EP1816656A3 EP1816656A3 (de) 2014-04-16
EP1816656B1 true EP1816656B1 (de) 2015-04-29

Family

ID=37027465

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070300763 Not-in-force EP1816656B1 (de) 2006-02-03 2007-02-01 Korrosionsgeschütztes elektrisches Kabel

Country Status (5)

Country Link
US (1) US20070199731A1 (de)
EP (1) EP1816656B1 (de)
CA (1) CA2576492A1 (de)
ES (1) ES2541542T3 (de)
FR (1) FR2897194B1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0823359B1 (pt) 2008-12-29 2019-02-05 Prysmian Spa cabo para transmissão de energia elétrica
CN102646467B (zh) * 2012-03-06 2015-05-20 立讯精密工业股份有限公司 一种设有导电塑胶材料层的信号传输线
CN203288307U (zh) * 2013-04-03 2013-11-13 潮州三环（集团）股份有限公司 一种贯通地线
EP2790189B1 (de) * 2013-04-08 2016-02-03 Nexans Datenübertragungskabel für die Luftfahrtindustrie
CN103871625A (zh) * 2014-03-01 2014-06-18 安徽华源电缆集团有限公司 一种发电用接地控制电缆
CN104200882B (zh) * 2014-09-10 2016-08-31 安徽华能电缆集团有限公司 一种顶部驱动钻井装置用铝合金芯橡套软电缆
EP3428932A1 (de) 2017-07-10 2019-01-16 NKT Cables Group A/S Elektrisches energiekabel
EP4050129A1 (de) 2021-02-26 2022-08-31 Nexans Korrosionsgeschütztes elektrisches kabel
CN113205918B (zh) * 2021-04-30 2023-02-03 合肥零碳技术有限公司 一种通信传输电缆

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
NL6702094A (de) * 1966-03-01 1967-09-04
US3795540A (en) * 1966-09-30 1974-03-05 Dow Chemical Co Cable shielding tape
US3817783A (en) * 1970-09-10 1974-06-18 British Insulated Callenders Electric conductor
US3737557A (en) * 1972-06-27 1973-06-05 British Insulated Callenders Electric cables with ethylene-propylene insulation
USRE30228E (en) * 1973-02-23 1980-03-11 General Cable Corporation Power cable with corrugated or smooth longitudinally folded metallic shielding tape
US3880358A (en) * 1973-08-15 1975-04-29 Edward J Schaming Coolant distribution and control system for metal rolling mills and the like
US4025715A (en) * 1976-03-15 1977-05-24 Alcan Aluminum Corporation Shielded electric cable
FR2530858B1 (fr) * 1982-04-06 1985-05-31 Thomson Jeumont Cables Cable electrique a conducteurs en aluminium
US5263307A (en) * 1991-02-15 1993-11-23 Hokkai Koki Co., Ltd. Corrosion resistant PC steel stranded cable and process of and apparatus for producing the same
US5714093A (en) * 1994-10-21 1998-02-03 Elisha Technologies Co. L.L.C. Corrosion resistant buffer system for metal products
EP1118397A1 (de) * 2000-01-19 2001-07-25 N.V. Bekaert S.A. Verformter Metallverbunddraht
US6555752B2 (en) * 2000-04-06 2003-04-29 Baker Hughes Incorporated Corrosion-resistant submersible pump electric cable
US20050167188A1 (en) * 2001-02-15 2005-08-04 Integral Technologies, Inc. Low cost acoustical structures manufactured from conductive loaded resin-based materials

Also Published As

Publication number Publication date
CA2576492A1 (en) 2007-08-03
FR2897194A1 (fr) 2007-08-10
EP1816656A2 (de) 2007-08-08
ES2541542T3 (es) 2015-07-21
US20070199731A1 (en) 2007-08-30
FR2897194B1 (fr) 2009-04-17
EP1816656A3 (de) 2014-04-16

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