EP2410534B1 - Cord for high voltage overhead electrical lines, with high thermal limit and with 3 load-bearing cables - Google Patents

Cord for high voltage overhead electrical lines, with high thermal limit and with 3 load-bearing cables Download PDF

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Publication number
EP2410534B1
EP2410534B1 EP11174563.4A EP11174563A EP2410534B1 EP 2410534 B1 EP2410534 B1 EP 2410534B1 EP 11174563 A EP11174563 A EP 11174563A EP 2410534 B1 EP2410534 B1 EP 2410534B1
Authority
EP
European Patent Office
Prior art keywords
cord
load
sheath
aluminium
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.)
Not-in-force
Application number
EP11174563.4A
Other languages
German (de)
French (fr)
Other versions
EP2410534A1 (en
Inventor
Gianfranco Civili
Domenico Valori
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.)
Tratos Cavi SpA
Original Assignee
Tratos Cavi SpA
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Publication date
Application filed by Tratos Cavi SpA filed Critical Tratos Cavi SpA
Publication of EP2410534A1 publication Critical patent/EP2410534A1/en
Application granted granted Critical
Publication of EP2410534B1 publication Critical patent/EP2410534B1/en
Not-in-force 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
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/08—Several wires or the like stranded in the form of a rope
    • H01B5/10—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material
    • H01B5/102—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material stranded around a high tensile strength core
    • H01B5/105—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material stranded around a high tensile strength core composed of synthetic filaments, e.g. glass-fibres

Definitions

  • the present invention relates to a cord for overhead electrical lines; the cord is suitable in particular for extreme environmental conditions (cold, ice and wind) and extreme installation conditions (large level differences).
  • Cords of the indicated type are known to be currently produced in the form of a load-bearing cable, usually of steel, which supports wires of conductor material, usually of aluminium or its alloys.
  • EP1821318 describes a cord for high voltage overhead electrical lines comprising a core about which at least one ring of quoins and/or conductors of circular cross-section and electrically conductive material are wrapped, the core consisting of at least three load-bearing cables twisted together, which are each formed from a plurality of twisted-together wires formed of composite hybrid carbon/glass fibre material.
  • the object of the present invention is to provide cords for electrical lines by which the stated technical drawbacks of the known art are eliminated.
  • the cord 1 presents a core 2 about which one, two or more rings of electrically conductive quoins 3 are wrapped.
  • the electrically conductive quoins are twisted together about the core in known manner. In alternative embodiments they can be formed of aluminium wires of circular cross-section.
  • They are preferably formed of Al-Zr alloy, however other materials which can be equally used include annealed aluminium and Al-Mg alloy.
  • the core is formed of three load-bearing cables 4 resting against each other and twisted together.
  • Each cable 4 is formed from a plurality of wires 5 also twisted together and made of composite material of hybrid carbon/glass fibres.
  • the wires 5 are covered with a first sheath 6 of aluminium (or other material, for example aluminium zirconium or Al-Mg alloy) hot-extruded directly onto the wires 5.
  • each cable comprises seven wires.
  • Such a wire number enables the cable to externally assume a nearly circular cross-section, which facilitates extrusion of the first sheath 6.
  • any number of wires can evidently be used.
  • the composite material wires are covered with special infill 7 (preferably silicone or bi-component material with programmed crosslinking) and are then wrapped in a special tape (advantageously of Nomex) which maintains the infill 7 in position during the operations involved in extruding the sheath 6.
  • special infill 7 preferably silicone or bi-component material with programmed crosslinking
  • the infill 7 is advantageously of very viscous bi-component silicone grease. It is crosslinking and tends to solidify in a programmable manner (in the present text, "programmable" means a material the crosslinking rate of which can be decided previously, for example 3 minutes - 24 hours).
  • infill 7 can also be avoided by extruding the sheath 6 about the wires such that the aluminium also penetrates into the stellate areas.
  • tubular filler elements Twisted together with the load-bearing cables 4 there are also provided at least three tubular filler elements of aluminium (or formed of flat/compact wires). These are internally hollow, i.e. they considerably reduce the weight of the cord compared with the use of solid filler elements. If it is wished to further increase the ultimate tensile strength, the tubular filler elements can be upgraded by a core of composite hybrid carbon/glass wires.
  • the load-bearing cables 4 and the filler elements 8 are surrounded by and maintained in position by a second aluminium sheath 9 formed from a C-shaped element, inside which the cables and the filler elements are housed and which is then welded longitudinally.
  • Welding is preferably by TIG welding, but laser or microplasma welding could also be used.
  • the second sheath 9 could be replaced by a binding of electrically conductive material, or alternatively this electrically conductive material could be extruded about the cables and filler elements.
  • the three load-bearing cables when viewed in cross-section, are positioned at the vertices of an equilateral triangle, as are also the filler elements.
  • the aforedescribed cord has seven bearing cables 4, and six filler elements 8, but in other embodiments a different number of bearing cables and filler elements can be provided.
  • the aforedescribed cord has advantageously a high thermal limit (up to 150 °C) and is preferably of low mass (less than 4 kg/m).
  • the maximum external diameter is preferably about 50 mm, enabling the corona effect to be reduced to a minimum.
  • the core of carbon and glass fibre based composite material results in low deformations at high loads.
  • the intrinsic characteristics of the cord make it particularly suitable for installation on high voltage overhead lines under extreme climatic conditions (wind and ice up to 60 mm thick) by virtue of its very high ultimate tensile strength.

Description

  • The present invention relates to a cord for overhead electrical lines; the cord is suitable in particular for extreme environmental conditions (cold, ice and wind) and extreme installation conditions (large level differences). Cords of the indicated type are known to be currently produced in the form of a load-bearing cable, usually of steel, which supports wires of conductor material, usually of aluminium or its alloys.
  • However these traditional cords (because of the intrinsic characteristics of the steel load-bearing cable) present a considerable weight per unit of length and a high average coefficient of thermal expansion.
  • EP1821318 describes a cord for high voltage overhead electrical lines comprising a core about which at least one ring of quoins and/or conductors of circular cross-section and electrically conductive material are wrapped, the core consisting of at least three load-bearing cables twisted together, which are each formed from a plurality of twisted-together wires formed of composite hybrid carbon/glass fibre material.
  • The object of the present invention is to provide cords for electrical lines by which the stated technical drawbacks of the known art are eliminated.
  • This and other objects are attained according to the present invention by a cord in accordance with the technical teachings of the accompanying claims.
  • Further characteristics and advantages of the invention will be more apparent from the description of a preferred but non-exclusive embodiment of the invention, illustrated by way of non-limiting in the single figure, which represents a cross-section through the cord.
  • The cord 1 presents a core 2 about which one, two or more rings of electrically conductive quoins 3 are wrapped. The electrically conductive quoins are twisted together about the core in known manner. In alternative embodiments they can be formed of aluminium wires of circular cross-section.
  • They are preferably formed of Al-Zr alloy, however other materials which can be equally used include annealed aluminium and Al-Mg alloy.
  • In the figure the core is formed of three load-bearing cables 4 resting against each other and twisted together.
  • Each cable 4 is formed from a plurality of wires 5 also twisted together and made of composite material of hybrid carbon/glass fibres. The wires 5 are covered with a first sheath 6 of aluminium (or other material, for example aluminium zirconium or Al-Mg alloy) hot-extruded directly onto the wires 5.
  • In the described embodiment, each cable comprises seven wires. Such a wire number enables the cable to externally assume a nearly circular cross-section, which facilitates extrusion of the first sheath 6. However any number of wires can evidently be used.
  • Advantageously, before extruding the sheath, the composite material wires are covered with special infill 7 (preferably silicone or bi-component material with programmed crosslinking) and are then wrapped in a special tape (advantageously of Nomex) which maintains the infill 7 in position during the operations involved in extruding the sheath 6.
  • The infill 7 is advantageously of very viscous bi-component silicone grease. It is crosslinking and tends to solidify in a programmable manner (in the present text, "programmable" means a material the crosslinking rate of which can be decided previously, for example 3 minutes - 24 hours).
  • The use of the infill 7 can also be avoided by extruding the sheath 6 about the wires such that the aluminium also penetrates into the stellate areas.
  • Twisted together with the load-bearing cables 4 there are also provided at least three tubular filler elements of aluminium (or formed of flat/compact wires). These are internally hollow, i.e. they considerably reduce the weight of the cord compared with the use of solid filler elements. If it is wished to further increase the ultimate tensile strength, the tubular filler elements can be upgraded by a core of composite hybrid carbon/glass wires.
  • In concluding the description of the figure, it should be noted that the load-bearing cables 4 and the filler elements 8 are surrounded by and maintained in position by a second aluminium sheath 9 formed from a C-shaped element, inside which the cables and the filler elements are housed and which is then welded longitudinally.
  • Welding is preferably by TIG welding, but laser or microplasma welding could also be used.
  • The second sheath 9 could be replaced by a binding of electrically conductive material, or alternatively this electrically conductive material could be extruded about the cables and filler elements.
  • As can be seen from the aforesaid figure the three load-bearing cables, when viewed in cross-section, are positioned at the vertices of an equilateral triangle, as are also the filler elements.
  • In an alternative embodiment the aforedescribed cord has seven bearing cables 4, and six filler elements 8, but in other embodiments a different number of bearing cables and filler elements can be provided.
  • The aforedescribed cord has advantageously a high thermal limit (up to 150 °C) and is preferably of low mass (less than 4 kg/m).
  • The maximum external diameter is preferably about 50 mm, enabling the corona effect to be reduced to a minimum. Given the vast conductive surface formed by the double series of quoins, by the second sheath, the first sheath and by the tubular filler elements, the cord presents high current capacities with consequent low resistance.
  • The core of carbon and glass fibre based composite material results in low deformations at high loads. The intrinsic characteristics of the cord make it particularly suitable for installation on high voltage overhead lines under extreme climatic conditions (wind and ice up to 60 mm thick) by virtue of its very high ultimate tensile strength.
  • By way of example, it can be installed over level differences of 300 m with spans of about 1000 metres.

Claims (10)

  1. A cord (1) for high voltage overhead electrical lines comprising a core about which at least one ring of quoins and/or conductors of circular cross-section and electrically conductive material are wrapped, the core consisting of at least three load-bearing cables (4) twisted together, which are each formed from a plurality of twisted-together wires (5) formed of composite hybrid carbon/glass fibre material, characterized in that the load-bearing cables (4) are covered by a hot-extruded first sheath (6) of aluminium or its alloys, at least three filler elements (8) of aluminium or its alloys being twisted together with said load-bearing cables (4), said load-bearing cables (4) and said filler elements being surrounded by a second aluminium sheath or by a binding of aluminium or its alloys, about which the quoins are wrapped.
  2. A cord as claimed in the preceding claim, wherein infill is provided between the wires and the first sheath to fill at least the stellate areas defined by the wires.
  3. A cord as claimed in the preceding claim, wherein before extruding the first sheath, said infill is maintained in position by a tape preferably of Nomex, wrapped about the cables.
  4. A cord as claimed in one or more of the preceding claims, wherein said infill comprises silicone grease and/or bi-component material crosslinkable in a programmable manner.
  5. A cord as claimed in one or more of the preceding claims, wherein said twisted-together load-bearing cables are three in number which, when viewed in cross-section are positioned at the vertices of an equilateral triangle, said filler elements being three in number, also twisted together and disposed at the vertices of an equilateral triangle.
  6. A cord as claimed in one or more of the preceding claims, wherein each load-bearing cable comprises seven wires of composite hybrid carbon/glass material.
  7. A cord as claimed in one or more of the preceding claims, wherein each filler element is formed from an internally hollow tubular element.
  8. A cord as claimed in the preceding claim, wherein a core of composite hybrid carbon/glass material is present in the cavity of each tubular element.
  9. A cord as claimed in one or more of the preceding claims, wherein said second sheath is welded longitudinally and/or is replaced by a binding of conductive material tape.
  10. A cord as claimed in one or more of the preceding claims, wherein said first sheath and/or said second sheath and/or said filler elements are formed of annealed aluminium, Al-Zr alloy or Al-Mg alloy.
EP11174563.4A 2010-07-22 2011-07-19 Cord for high voltage overhead electrical lines, with high thermal limit and with 3 load-bearing cables Not-in-force EP2410534B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2010A001355A IT1401307B1 (en) 2010-07-22 2010-07-22 ROPE FOR HIGH-VOLTAGE AIR LINES WITH HIGH THERMAL LIMIT AND 3 CARRIERS

Publications (2)

Publication Number Publication Date
EP2410534A1 EP2410534A1 (en) 2012-01-25
EP2410534B1 true EP2410534B1 (en) 2016-12-14

Family

ID=43607809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11174563.4A Not-in-force EP2410534B1 (en) 2010-07-22 2011-07-19 Cord for high voltage overhead electrical lines, with high thermal limit and with 3 load-bearing cables

Country Status (3)

Country Link
EP (1) EP2410534B1 (en)
ES (1) ES2618877T3 (en)
IT (1) IT1401307B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3004847B1 (en) * 2013-04-17 2016-07-29 Nexans JONCS COMPOSITES ELECTRICITY TRANSPORT CABLE
CN106415738A (en) * 2014-04-09 2017-02-15 意大利德安产品有限公司 Conductor for bare overhead electric lines, especially for middle-high thermal limit, and low expansion at high electronic loads
CN105810296A (en) * 2016-05-04 2016-07-27 江苏红峰电缆集团有限公司 1kv aluminum-core overhead cable

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03129606A (en) * 1989-07-27 1991-06-03 Hitachi Cable Ltd Aerial power cable
US20050181228A1 (en) * 2004-02-13 2005-08-18 3M Innovative Properties Company Metal-cladded metal matrix composite wire
ITMI20060297A1 (en) * 2006-02-17 2007-08-18 Angeli Prodotti S R L CONDUCTOR CABLE FOR ELECTRIC LINES
FR2909481B1 (en) * 2006-12-01 2009-01-23 Nexans Sa ELECTRICAL TRANSPORT CONDUCTOR FOR AERIAL LINE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
IT1401307B1 (en) 2013-07-18
EP2410534A1 (en) 2012-01-25
ES2618877T3 (en) 2017-06-22
ITMI20101355A1 (en) 2012-01-23

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