EP2937871A1 - Verwindungssteifes elektrokabel - Google Patents

Verwindungssteifes elektrokabel Download PDF

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Publication number
EP2937871A1
EP2937871A1 EP15305366.5A EP15305366A EP2937871A1 EP 2937871 A1 EP2937871 A1 EP 2937871A1 EP 15305366 A EP15305366 A EP 15305366A EP 2937871 A1 EP2937871 A1 EP 2937871A1
Authority
EP
European Patent Office
Prior art keywords
electrical cable
cable according
cable
central zone
metal wires
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.)
Granted
Application number
EP15305366.5A
Other languages
English (en)
French (fr)
Other versions
EP2937871B1 (de
Inventor
Guillaume VEGA
Philippe Michel
Nicolas Rousselet
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 EP2937871A1 publication Critical patent/EP2937871A1/de
Application granted granted Critical
Publication of EP2937871B1 publication Critical patent/EP2937871B1/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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • 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

Definitions

  • the invention relates to an electric cable resistant to torsion and therefore particularly suitable for a wind-type application.
  • such cables generally have an electrical conductor in the form of several wires.
  • these flexible cables for connecting wind turbines are subjected to repeated torsional stress, of about 150 ° per meter, for several thousand cycles.
  • these torsional stresses have a harmful impact on these cables, since they can lead to the breaking of several of these conductive wires.
  • these son are preferably made of aluminum or aluminum alloys, further accentuating the risk of rupture, because of the low torsional strength of aluminum.
  • the patent GB2323207 discloses a hollow and flexible electrical conductor comprising a weave of individually insulated metal wires, said conductor providing a central cylindrical channel for the passage of water. An inner layer and a superimposed outer layer of copper or aluminum filaments are impregnated with a polyurethane resin which is electrically insulating.
  • An electrical cable according to the invention is configured to withstand large and repeated torsional stress, while being light and retaining its electrical conduction properties.
  • the subject of the invention is an electric cable having a conductor in the form of a plurality of metal wires each comprising aluminum.
  • the main feature of a cable according to the invention is that it comprises a central zone devoid of metal son, so as to allow the metal son placed around said central zone, to slide on each other when said cable undergoes a torsional stress.
  • the conductor wires preferentially tend to break at the central zone of the cable, when said cable undergoes repeated torsion forces.
  • they have been removed from the cable, so that the remaining conductive wires, which surround the central zone, have an elongation capacity during such twisting forces. Due to this central zone devoid of conducting metal wires, a cable according to the invention can withstand repeated torsion forces while retaining its structure and thus its ability to conduct electric current.
  • Such a cable is particularly suitable for use in wind turbines, where it forms a loop and is thus subjected to significant torsional forces.
  • the fact that the conductive threads contain aluminum allows the cable to be lightened.
  • the wires of such a cable may or may not be twisted.
  • the metal wires are made solely of aluminum. This is an optimized configuration allowing maximum lightening of the cable.
  • the metal wires are made based on an alloy comprising aluminum.
  • the presence of aluminum is justified to lighten the cable.
  • the central area devoid of metal son is cylindrical. This is a configuration that is easy to manufacture and symmetries the structure of the cable.
  • the ratio of the diameter of the central zone to the total diameter of the conductor is between 0.10 and 0.5. Indeed, it has been observed that over such a range of this ratio, the cable could both provide good electrical conduction and effectively withstand repeated torsional forces without altering its original structure. Preferably, this ratio is 0.33.
  • the central zone is empty and is delimited by metal wires of the conductor.
  • this central zone constitutes a zone of clearance.
  • the metal son present in the cable can come to occupy this central area and thus avoid breaking.
  • the fact that the central zone is empty makes it possible to accentuate the lightening of the cable.
  • the central zone is filled with a non-conductive fill material.
  • This material contributes to the mechanical strength of the cable without weighing it down significantly.
  • the density of the filling material is lower than that of the metal wires.
  • the filling material is to be chosen from solid rubber, paper and aramid fiber.
  • the central zone is occupied by a spiral spring.
  • This spring is arranged in the cable so that its axis of revolution coincides with the central longitudinal axis of the cable.
  • This spring contributes to the mechanical strength of the cable.
  • the spring can relax by elongating, and thus reduce the diameter of its turns, leaving room for the metal son to occupy part of the central area of said cable.
  • the spring is a hollow piece that contributes to the lightening of the cable.
  • the diameter of the metal wires is less than 1 mm. In this way, such wires guarantee the flexibility of the cable.
  • the diameter of the metal wires is 0.6 mm.
  • the cable comprises a polymer sheath surrounding the metal wires of the electrical conductor.
  • the central zone comprises an optical fiber. Since the central zone of the cable is not occupied by conducting metal wires, any type of additional cable can come to occupy said central zone, according to the needs met.
  • An optical fiber is an appropriate example of this type of additional cable, because it is light and compact.
  • An electric cable according to the invention has the advantage of being light and resistant to repeated torsion forces, and is therefore perfectly suitable for a wind-type application. It has the advantage of having good mechanical strength and good flexibility. He finally presents the advantage of having a relatively constant cost, or even reduced, compared to an existing cable and having a solid cylindrical conductor consisting of a plurality of metal son, due to a limited number of said metal son.
  • the flexible cables 1 for connecting a turbine 2 of wind turbine 3 are subjected to repeated torsional stress, of the order of 150 ° per meter, for several thousand cycles.
  • These cables 1 each comprise an electrical conductor in the form of a plurality of metal wires, and more specifically aluminum wires.
  • Aluminum has the distinction of being both light and good electrical conductor, but being able to withstand torsional forces over time.
  • this conductor has generally the shape of a solid cylinder, and is surrounded by a polymer sheath.
  • the electrical cables for connecting a turbine 2 of a wind turbine 3 according to the invention are designed so as to be devoid of central wires made of aluminum, so that the driver takes on the general shape.
  • the central channel is cylindrical.
  • the central channel 7 of the cable 10 is occupied by a spiral spring 8, having an axis of revolution passing through said spring 8 at the center of each turn the constituent.
  • This spring 8 is disposed in the channel 7 so that its axis of revolution is coincident with the axis of revolution of said central channel 7.
  • the spring 8 is s' stretching in the channel 7 by progressively reducing the diameter of its turns, thus creating a free space to allow the aluminum wires constituting the hollow cylindrical conductor 4 to occupy part of this central channel 7, left vacant by said spring 8 in traction.
  • Such a cable 10 is surrounded by a sheath 6 made of polymer, placed around the aluminum wires 5.
  • the central channel 7 is occupied by a filling material 9, which is lighter than aluminum and which is electrically insulating.
  • This material may for example be paper, a rigid rubber or aramid fiber.
  • the cable 100 is surrounded by a sheath 6 made of polymer, placed around the aluminum wires 5.
  • the central channel is empty and is delimited by the remaining wires in aluminum.
  • This empty channel serves as a clearance zone to allow the aluminum son delimiting it to come occupy it during a torsion effort. In this way, said son can react to such a torsional force by moving in the central channel of the cable, without risk of breaking.
  • the central channel 7 can be crossed by any type of cable that can perform a specific function, such as an optical fiber.
  • the ratio of the diameter of the internal channel 7 to the diameter of the conductor 4 of the cable 1, 10, 100 should be between 0.10 and 0.5 so that said cable 1, 10, 100 can both drive efficiently. electrical current and withstand twisting forces without degrading.

Landscapes

  • Communication Cables (AREA)
  • Ropes Or Cables (AREA)
  • Insulated Conductors (AREA)
EP15305366.5A 2014-04-22 2015-03-11 Verwindungssteifes elektrokabel Not-in-force EP2937871B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1453611A FR3020174A1 (fr) 2014-04-22 2014-04-22 Cable electrique resistant a la torsion

Publications (2)

Publication Number Publication Date
EP2937871A1 true EP2937871A1 (de) 2015-10-28
EP2937871B1 EP2937871B1 (de) 2016-10-12

Family

ID=51168148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15305366.5A Not-in-force EP2937871B1 (de) 2014-04-22 2015-03-11 Verwindungssteifes elektrokabel

Country Status (4)

Country Link
EP (1) EP2937871B1 (de)
DK (1) DK2937871T3 (de)
ES (1) ES2608666T3 (de)
FR (1) FR3020174A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144743A1 (de) * 1981-11-11 1983-05-19 U.I. Lapp Kg, 7000 Stuttgart Elektrische, flexible leitung mit besonderer widerstandsfaehigkeit gegen torsionsbeanspruchung
GB2323207A (en) 1997-03-11 1998-09-16 Elscint Ltd Flexible hollow electrical cable
CN201845586U (zh) * 2010-09-30 2011-05-25 中利科技集团股份有限公司 柔软性抗拉风能电缆
CN201984860U (zh) * 2010-12-13 2011-09-21 巢冬菊 抗拉伸电缆
WO2012013659A1 (en) * 2010-07-26 2012-02-02 Dsm Ip Assets B.V. Tether for renewable energy systems
CN202694899U (zh) * 2012-05-16 2013-01-23 安徽华峰电缆集团有限公司 一种风力发电用轻质软电缆

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144743A1 (de) * 1981-11-11 1983-05-19 U.I. Lapp Kg, 7000 Stuttgart Elektrische, flexible leitung mit besonderer widerstandsfaehigkeit gegen torsionsbeanspruchung
GB2323207A (en) 1997-03-11 1998-09-16 Elscint Ltd Flexible hollow electrical cable
WO2012013659A1 (en) * 2010-07-26 2012-02-02 Dsm Ip Assets B.V. Tether for renewable energy systems
CN201845586U (zh) * 2010-09-30 2011-05-25 中利科技集团股份有限公司 柔软性抗拉风能电缆
CN201984860U (zh) * 2010-12-13 2011-09-21 巢冬菊 抗拉伸电缆
CN202694899U (zh) * 2012-05-16 2013-01-23 安徽华峰电缆集团有限公司 一种风力发电用轻质软电缆

Also Published As

Publication number Publication date
EP2937871B1 (de) 2016-10-12
FR3020174A1 (fr) 2015-10-23
ES2608666T3 (es) 2017-04-12
DK2937871T3 (en) 2017-01-23

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