EP2905788B1 - Câble électrique sous-marin - Google Patents
Câble électrique sous-marin Download PDFInfo
- Publication number
- EP2905788B1 EP2905788B1 EP14305168.8A EP14305168A EP2905788B1 EP 2905788 B1 EP2905788 B1 EP 2905788B1 EP 14305168 A EP14305168 A EP 14305168A EP 2905788 B1 EP2905788 B1 EP 2905788B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductor
- power cable
- subsea power
- aluminium
- elements
- 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.)
- Active
Links
- 239000004020 conductor Substances 0.000 claims description 127
- 239000000463 material Substances 0.000 claims description 49
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 239000010949 copper Substances 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- 239000004411 aluminium Substances 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 229910000838 Al alloy Inorganic materials 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 150000002739 metals Chemical class 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 8
- 239000007769 metal material Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000012811 non-conductive material Substances 0.000 description 4
- 239000003643 water by type Substances 0.000 description 3
- 230000001627 detrimental effect Effects 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
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
- H01B7/14—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 are distributed in more layers of the conductor.
- 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 player.
- At least one of the conductor elements 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 an example of a conductor for an armoured subsea cable.
- 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.
Landscapes
- Insulated Conductors (AREA)
Claims (9)
- Câble d'alimentation sous-marin (1) comprenant un conducteur (10) entouré par au moins une couche d'isolation (20) et au moins une couche d'armure (40), le conducteur (10) comprenant au moins un premier élément conducteur (12b, 15b) et un deuxième élément conducteur (12a, 15a), où le premier élément conducteur (12b, 15b) est constitué d'un premier matériau et le deuxième élément conducteur (12a, 15a) est constitué d'un deuxième matériau et où les premier et deuxième matériaux sont différents, caractérisé en ce que le conducteur (10) comprend une âme, une première couche entourant l'âme et une deuxième couche entourant la première couche, la première couche et la deuxième couche étant chacune constituées de premiers éléments conducteurs et de deuxièmes éléments conducteurs.
- Câble d'alimentation sous-marin selon la revendication 1, dans lequel le conducteur (10) comprend un troisième élément conducteur (12c, 15c) constitué d'un troisième matériau différent du premier et du deuxième matériau.
- Câble d'alimentation sous-marin selon la revendication 1 ou 2, dans lequel les éléments conducteurs de différents matériaux sont répartis dans l'ensemble de la section transversale du conducteur.
- Câble d'alimentation sous-marin selon l'une quelconque des revendications précédentes, dans lequel les deux ou plus de deux types de matériaux différents sont chacun un matériau indépendamment choisi dans le groupe comprenant le cuivre, des alliages de cuivre, l'aluminium, des alliages d'aluminium, l'acier, d'autres métaux ou matériaux non métalliques.
- Câble d'alimentation sous-marin selon la revendication 4, dans lequel le premier matériau est le cuivre ou un alliage de cuivre et le deuxième matériau est l'aluminium ou un alliage d'aluminium.
- Câble d'alimentation sous-marin selon la revendication 4, dans lequel le premier matériau est l'aluminium ou un alliage d'aluminium et le deuxième matériau est le cuivre ou un alliage de cuivre.
- Câble d'alimentation sous-marin selon la revendication 2 et la revendication 5 ou 6, dans lequel le troisième matériau est l'acier.
- Câble d'alimentation sous-marin selon l'une quelconque des revendications précédentes, le câble d'alimentation sous-marin étant un câble d'alimentation sous-marin à haute tension.
- Câble d'alimentation sous-marin selon l'une quelconque des revendications précédentes, dans lequel au moins l'un parmi le premier, le deuxième ou le troisième matériau est l'aluminium ou un alliage d'aluminium.
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 EP2905788A1 (fr) | 2015-08-12 |
EP2905788B1 true 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) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014208821A1 (de) * | 2014-05-09 | 2015-11-12 | Bayerische Kabelwerke Ag | Kabel, insbesondere Erdungskabel zur Erdung von Einrichtungen im Freiland |
GB201521160D0 (en) * | 2015-12-01 | 2016-01-13 | Zytech Ltd | Cable |
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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO329604B1 (no) * | 2006-02-17 | 2010-11-22 | Nexans | Elektrisk undervannskabel og system for direkte elektrisk oppvarming |
GB2462130B (en) * | 2008-07-25 | 2011-02-23 | Technip France | Umbilical |
CN101807453B (zh) * | 2010-03-29 | 2012-02-22 | 浙江省电力公司舟山电力局 | 用于海底的电力电缆 |
-
2014
- 2014-02-07 EP EP14305168.8A patent/EP2905788B1/fr active Active
Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
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EP2905788A1 (fr) | 2015-08-12 |
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