EP2905788A1 - Câble électrique sous-marin - Google Patents

Câble électrique sous-marin Download PDF

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Publication number
EP2905788A1
EP2905788A1 EP14305168.8A EP14305168A EP2905788A1 EP 2905788 A1 EP2905788 A1 EP 2905788A1 EP 14305168 A EP14305168 A EP 14305168A EP 2905788 A1 EP2905788 A1 EP 2905788A1
Authority
EP
European Patent Office
Prior art keywords
conductor
power cable
subsea power
layer
aluminium
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
EP14305168.8A
Other languages
German (de)
English (en)
Other versions
EP2905788B1 (fr
Inventor
Knut Stenseth
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
Priority to EP14305168.8A priority Critical patent/EP2905788B1/fr
Publication of EP2905788A1 publication Critical patent/EP2905788A1/fr
Application granted granted Critical
Publication of EP2905788B1 publication Critical patent/EP2905788B1/fr
Active 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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/14—Submarine cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H01B1/023—Alloys based on aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H01B1/026—Alloys based on copper
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/006—Constructional features relating to the conductors

Definitions

  • the present invention relates to a subsea power cable and the design of a conductor for such a cable, especially for a cable for deep waters where the cable during the laying of the cable is exposed to high tension.
  • the volume and weight of the cable is of high importance to the costs and size of equipment involved in the laying of the cable.
  • the metal conductor contributes significantly to the weight of the cables and prior art solutions to reduce the weight comprise selecting lighter metals such as aluminium for the conductor.
  • lighter metals such as aluminium for the conductor.
  • the light metals such as pure aluminium yield and therefore the other cable elements, mainly the armour will have to take all the laying tension. In such case not only the conductor will be given a permanent elongation which is detrimental to the cable, but the consequence is also damage to the cable insulation. If the conductor yields due to high tension the conductor is elongated and thereby the diameter thereof is reduced.
  • An objective of the present invention is to provide a subsea cable with conductors optimized with respect to conductivity, volume and weight such that the conductor will not yield under high laying tension in deep waters. When the conductor does not yield the risk of damaging the insulation is avoided.
  • Another objective is to provide a solution that allows for individual optimization of the conductivity, weight and volume of the conductor.
  • the present invention provides a subsea power cable comprising at least one conductor surrounded by at least one layer of insulation and at least one layer of armouring, wherein the conductor comprises at least a first conductor element and a second conductor element, where the first conductor element is made of a first material and the second conductor element is made of a second material and where the first and the second materials are different.
  • each conductor element of can be round or any other shape.
  • the conductor comprises at least two conductor elements but may comprise any number, from 2 - 100, preferably between 2 and 50 conductor elements or alternatively 3 or more elements, preferably between 3-100 elements.
  • the conductor elements of different materials can be distributed in one or more layers of the conductor. In one aspect the two or more conductor elements are stranded together.
  • the properties of the conductor can be adapted to provide for optimization of the conductivity, weight and volume of the conductor.
  • the conductor comprises a third conductor element made of a third material different from the first and the second material.
  • the conductor elements of different materials are distributed throughout the cross-section of the conductor.
  • the conductor comprises a core, a first layer surrounding the core and a second layer surrounding the first layer, wherein the first layer is made of the first material and the second layer is made of the second material.
  • the conductor is conductive.
  • the two or more different types of materials are in one aspect each a material independently selected from the group comprising copper, copper alloys, aluminium, aluminium alloys, steel, other metals or non-metallic materials.
  • the first material is copper or a copper alloy and the second material is aluminium or an aluminium alloy.
  • the first material is aluminium or an aluminium alloy and the second material is copper or a copper alloy.
  • the subsea cable is a high voltage power cable.
  • High voltage means above 1000 V for AC or above 1500 V for DC, preferably 50 kV for AC or above 500 kV for DC or alternatively above 200 kV for AC or above 600 kV for DC
  • At least one of the first, second or third material is aluminium or aluminium alloy.
  • the selection and distribution of conductor elements of different materials within the conductor of the subsea power cable are such that the conductor will not yield during the laying of the cable as the yield stress limit of the conductor is not reached when laying at water depths of 400 - 3000 m. Alternatively when laying at water depths below 500 m or between 600 and 2500 m.
  • power cable refers to any cable which at least has the purpose of transferring electrical power. This may be the main purpose and it may be the only purpose, the cable may however have additional purposes such as transferring signals or fluids.
  • High cable laying tension is used here to refer to tensions which may expose the conductor to a stress which exceeds the yield stress of the traditional conductor material.
  • critical laying tension could be in the range 50 tonnes, but the critical tension will depend on different parameters of the cable design, such as conductor size, the armour design etc.
  • the present invention is especially applicable for power cables to be laid at large water depths such as 400 m - 3000 m, 600-2500 m or 400-2000 m.
  • alloy as used in copper alloy, aluminium alloy and other alloys refers to a metal alloy which comprises the mentioned metal in an amount of between 50 and 99 w/w %.
  • the term "different" as used herein referring to the first, second and optionally more materials being different, is to be understood as describing solutions where the pure metal component or the main metal of the metal alloy is different such as one component is made of copper or copper alloy and the other is made of aluminium or aluminium alloy. Different also includes the situation with one metallic conductor element and one non metallic conductor element. Different also describes the situation where the two conductor elements are made of a pure metal and an alloy of the same pure metal or two different alloys of the same metal. For a pure metal and an alloy thereof of two alloys or the same metal to be different the materials have a difference in yield stress limit of at least 1 %, preferably at least 3 % more preferably at least 10%.
  • Figure 1 illustrates the cross-section of a subsea power cable 1 according to the present invention.
  • the power cable comprises a conductor 1 surrounded by a layer of insulation 20. Surrounding the insulation is an optional metal sheath 30. Surrounding the metal sheath 30 is an armouring layer 40 and outside of that is an outer serving 50.
  • Subsea power cables are well known in the art and may comprise additional layers than the layers disclosed here. Further the conductor, insulation layer and the armouring layer may consist of one or more layers of material.
  • the armouring may comprise wires stranded or helically wound around the core of the cable. It is well known to include more than one layer of armouring around the core at different lay lengths and/or directions.
  • the present invention relates to providing a new conductor for an armoured subsea power cable. Accordingly the present invention is not limited to a specially structure of the layers surrounding the conductor other than that the structure comprises armouring in the form of wires or bands of metal or fibre reinforced polymers. However, if the conductor yields under high tension not only the conductor will be given a permanent elongation which is detrimental to the cable, but the consequence is also damage to the cable insulation.
  • the embodiment of the conductor 10 illustrated on figure 1 comprises an central wire 11 and a first inner layer and a second surrounding the first layer.
  • the central wire will not exist, but will form an oil channel as the first layer is self supported or supported by a tube or other kind of support.
  • the first layer is made up of conductor elements 15a and 15b aligned around the central wire.
  • the second layer is made up of conductor elements 12a and 12b aligned around the outer surface of the first layer.
  • the central wire 11, the conductor elements 12b and 15b are all made of a first conducting material whereas the conductor elements 12a and 15a are made of a second conducting material different from the first conducting material.
  • the elements of different materials within each layer are evenly distributed, every second element in each layer is made of the same material.
  • the first and second conductive material are selected from the group comprising copper, copper based alloys, aluminium, aluminium alloys, steel, other conductive metals, and other conductive or non-conductive materials.
  • Figure 2 illustrates an alternative embodiment of the conductor 10 for an armoured subsea cable according to the present invention.
  • the conductor comprises a central wire and three layers of conducting elements 15a, 15b, 12a, 12b, 18a and 18b arranged around the core.
  • the central wire 11, the conductor elements 12b and 15b are all made of a first conducting material whereas the conductor elements 12a and 15a are made of a second conducting material different from the first conducting material.
  • the elements of different materials within the first and the second layer are evenly distributed, every second element in each layer is made of the same material.
  • the number of elements 18a of the second material is less than the number of conducting elements 18b of the first material.
  • the conductor comprises layers with different ratio of the different materials.
  • the first and second conductive material are selected from the group comprising copper, copper based alloys, aluminium, aluminium alloys, steel, other conductive metals, and other conductive or non-conductive materials.
  • Figure 3 illustrates a third embodiment of a conductor for an armoured subsea cable according to the present invention.
  • the conductor comprises a central wire and two layers of conducting elements 15a, and 12b arranged around the core.
  • the central wire 11 and the conductor elements 12b are all made of a first conducting material whereas the conductor elements 15a are made of a second conducting material different from the first conducting material.
  • the elements of different materials are arranged as layers of a second material arranged between the core and a second layer of a first material.
  • the layers are illustrated as consisting of a number of separate elements arranged as a surrounding layer it is equally possible to prepare one or more of the layers as one single element.
  • the first and second conductive material are selected from the group comprising copper, copper based alloys, aluminium, aluminium alloys, steel, other conductive metals, and other conductive materials.
  • Figure 4 illustrates a fourth embodiment of a conductor for an armoured subsea cable according to the present invention.
  • the conductor comprises a central wire and two layers of conducting elements 15a, 15b, 15c and 12a,12b, 12c arranged around the core.
  • the central wire 11 and the conductor elements 12b and 15b are all made of a first conducting material whereas the conductor elements 12a and 15a are made of a second conducting material different from the first conducting material and the conducting elements 12c and 15c are made of a third conducting material different from the first and the second conducting material.
  • the elements of three different materials are evenly distributed in each layer.
  • the first, second and third conductive material are selected from the group comprising copper, copper based alloys, aluminium, aluminium alloys, steel, other conductive metals, and other conductive or non-conductive materials.
  • Figure 5 illustrates a fifth embodiment of a conductor for an armoured subsea cable according to the present invention.
  • the conductor comprises a central wire and two layers of conducting elements 15a, 15b and 12a, 12b arranged around the core.
  • the conductor elements 12b and 15b are all made of a first conducting material whereas the central wire 11a and the conductor elements 12a and 15a are made of a second conducting material different from the first conducting material.
  • the conducting elements each have a circular cross-section. The elements conductor may be stranded together.
  • the first and second conductive material are selected from the group comprising copper, copper based alloys, aluminium, aluminium alloys, steel, other conductive metals, and other conductive or non-conductive materials.

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  • Insulated Conductors (AREA)
EP14305168.8A 2014-02-07 2014-02-07 Câble électrique sous-marin Active EP2905788B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14305168.8A EP2905788B1 (fr) 2014-02-07 2014-02-07 Câble électrique sous-marin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14305168.8A EP2905788B1 (fr) 2014-02-07 2014-02-07 Câble électrique sous-marin

Publications (2)

Publication Number Publication Date
EP2905788A1 true EP2905788A1 (fr) 2015-08-12
EP2905788B1 EP2905788B1 (fr) 2020-09-02

Family

ID=50156709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14305168.8A Active EP2905788B1 (fr) 2014-02-07 2014-02-07 Câble électrique sous-marin

Country Status (1)

Country Link
EP (1) EP2905788B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2942786A1 (fr) * 2014-05-09 2015-11-11 Bayerische Kabelwerke AG Câble, notamment câble de mise à la terre de dispositifs installés en plein air
CN105529101A (zh) * 2016-01-27 2016-04-27 安徽光复电缆有限公司 一种乙丙橡胶绝缘及钢带铠装线缆
WO2017093723A1 (fr) * 2015-12-01 2017-06-08 Zytech Ltd Câbles électriques
DE102018007551A1 (de) * 2018-09-25 2020-03-26 Leoni Kabel Gmbh Elektrische Litze
CN110993166A (zh) * 2019-12-26 2020-04-10 安徽国电电缆股份有限公司 一种应用在海底的抗压电线电缆

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070237469A1 (en) * 2006-02-17 2007-10-11 Olsen Espen Electric submarine power cable and system for direct electric heating
CN101807453A (zh) * 2010-03-29 2010-08-18 浙江省电力公司舟山电力局 用于海底的电力电缆
US20120061123A1 (en) * 2008-07-25 2012-03-15 Alan William Deighton Umbilical

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070237469A1 (en) * 2006-02-17 2007-10-11 Olsen Espen Electric submarine power cable and system for direct electric heating
US20120061123A1 (en) * 2008-07-25 2012-03-15 Alan William Deighton Umbilical
CN101807453A (zh) * 2010-03-29 2010-08-18 浙江省电力公司舟山电力局 用于海底的电力电缆

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2942786A1 (fr) * 2014-05-09 2015-11-11 Bayerische Kabelwerke AG Câble, notamment câble de mise à la terre de dispositifs installés en plein air
WO2017093723A1 (fr) * 2015-12-01 2017-06-08 Zytech Ltd Câbles électriques
CN105529101A (zh) * 2016-01-27 2016-04-27 安徽光复电缆有限公司 一种乙丙橡胶绝缘及钢带铠装线缆
DE102018007551A1 (de) * 2018-09-25 2020-03-26 Leoni Kabel Gmbh Elektrische Litze
CN110993166A (zh) * 2019-12-26 2020-04-10 安徽国电电缆股份有限公司 一种应用在海底的抗压电线电缆

Also Published As

Publication number Publication date
EP2905788B1 (fr) 2020-09-02

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