EP3244422B1 - Three core power cables with surrounding plastic filler - Google Patents

Three core power cables with surrounding plastic filler Download PDF

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Publication number
EP3244422B1
EP3244422B1 EP16305537.9A EP16305537A EP3244422B1 EP 3244422 B1 EP3244422 B1 EP 3244422B1 EP 16305537 A EP16305537 A EP 16305537A EP 3244422 B1 EP3244422 B1 EP 3244422B1
Authority
EP
European Patent Office
Prior art keywords
cores
fillers
power cable
outer covering
cable according
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.)
Revoked
Application number
EP16305537.9A
Other languages
German (de)
French (fr)
Other versions
EP3244422A1 (en
Inventor
Hans Kvarme
Vegar Syrtveit LARSEN
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=55970940&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP3244422(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Nexans SA filed Critical Nexans SA
Priority to DK16305537.9T priority Critical patent/DK3244422T3/en
Priority to EP16305537.9A priority patent/EP3244422B1/en
Publication of EP3244422A1 publication Critical patent/EP3244422A1/en
Application granted granted Critical
Publication of EP3244422B1 publication Critical patent/EP3244422B1/en
Revoked 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
    • H01B7/17—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
    • H01B7/1895—Internal space filling-up means

Definitions

  • high voltage means voltage greater than about 36 kV.
  • the metallic armoring provides a benefit in terms of impact protection, the armoring has drawbacks.
  • the metallic armoring adds weight to the cable, as well as cost.
  • the metallic armoring causes a condition known as "armor loss", that can decrease the current rating of the cable. Armor loss occurs due to circulating currents in the armoring due to fluctuating electrical fields and due to charging current.
  • the current rating and current loss of three-core power cables is calculated using the IEC 60287 standard.
  • the filler are designed to withstand impact.
  • the fillers according to one aspect are formed of PE or other suitable plastic material.

Landscapes

  • Insulated Conductors (AREA)

Description

    Filed of the invention
  • The invention relates to impact resistant power cables, in particular to multipolar power cables, more particularly to three-core power cables.
    • Background
  • Impact resistant multipolar cables are employed in a number of industries. Such cables provide protection against accidental impact to the cable. The cables can provide distribution of low, medium or high voltage electrical power.
  • As used herein, "low voltage" means voltage less than about 1 kV.
  • As used herein, "medium voltage" means voltage between about 1kV - 36 kV..
  • As used herein, "high voltage" means voltage greater than about 36 kV.
  • A particular type of cable, known as a "steel wire armored cable" commonly abbreviated "SWA", is a hard wearing power cable designed for the supply of mains electricity. It is one type of a number of armored electrical cables, and is used in underground systems, power networks and subsea applications. A particular type of SWA is an armored three-core power cable, known to one skilled in the art of power cables.
  • Traditional three-core power cables comprise three insulated conductors grouped together in the center of the cable, and surrounded by an outer covering or roving. The cable has so-called interstitial zones between any two adjacent cores and the outer covering. As used herein, the term "interstitial zone" refers to the generally triangular shaped area defined by the space between two adjacent cores and the immediately opposing inner surface of the outer layer. By "immediately opposing" is meant the general area of the portion of the outer covering at a point that intersects the shortest segment of a line that is perpendicular to a line bisecting the two cores. The term "triangular" is only meant in a general sense, as the opposing segment of the outer cover is obviously curved, as are the cores themselves.
  • An extruded plastic profile known as a "filler" is arranged to fill the interstitial zones and hold the three conductors in a relative position so as to maintain the cable's circular cross section. A binder layer is often arranged about the filler, and a layer of wound metallic armoring wires is arranged between the binder and the outer covering. An illustration of known prior art SWA cables is illustrated in Figure 1. The purpose of the metallic armoring wires is to provide tensile strength and impact resistance for the power cable. As shown in Figure 1, in traditional power cables the plastic fillers do not completely surround the conductors. This is not necessary, as in the prior art it is the steel wires, not the fillers, that provide impact protection for the cores.
  • While the metallic armoring provides a benefit in terms of impact protection, the armoring has drawbacks. The metallic armoring adds weight to the cable, as well as cost. In addition, the metallic armoring causes a condition known as "armor loss", that can decrease the current rating of the cable. Armor loss occurs due to circulating currents in the armoring due to fluctuating electrical fields and due to charging current. The current rating and current loss of three-core power cables is calculated using the IEC 60287 standard.
  • WO2015040488 describes disadvantages of metal armor wires in a power cable, and suggests eliminating them, and instead using a solid "expandable polymeric material" that surrounds the cores 1 in addition to an "expanded resistance layer". The "expanded polymeric material" is not, however, a pre-extruded plastic profile.
  • While documents US 8 723 030 B2 and WO 2011/059337 A1 disclose power cables according to the preamble of claim 1.
    • Summary of the invention
  • The present invention according to claim 1 has as its object to overcome the deficiencies of the prior art, in particular the disadvantages caused by metallic armoring wires, while providing a simple and cost effective arrangement for filling the interstitial zones of the cable. The power cable of the invention comprises the components of a traditional three-core power cable, but eliminates the metallic armoring wires. Impact resistance is provided instead by extruded plastic fillers that surround the cores. The fillers are arranged to fill the interstices between conductors, and surround the conductors. The plastic fillers comprise an interstices-filling central portion and two outwardly extending curved arm portions. The arm portions have a length and shape such that ends of adjacent arm portions abut one another and form a barrier between the intermediate core and the outer covering. The curved inner surface of the arm portions, together with curved inner surfaces of the interstices-filling central portion form semi-circular or mostly circular channels with which are positioned the cores.
    • Brief description of the drawings
  • The invention will be described in detail with reference to the following figures, wherein:
    • Figure 1 is an illustration of the prior art
    • Figure 2 is a cross sectional view of an embodiment of the cable according to the invention
    • Figure 3 is a perspective view of an embodiment of the cable according to the invention
    Detailed description
  • As shown in figures 2 and 3 a three-core power cable 1 is provided. Power cores can have various designs. A power cord according to the invention is illustrated in figure 2 and 3, where the power cores comprise a conductor 9, typically made of copper or aluminum in the form of twisted wires or a rod, surrounded by an insulation layer 8. Surrounding insulation layer 8 is an outer semi conductor 7. A water swellable tape 6 surrounds semi conductor 7. Arranged about swellable tape 6 is a lead sheath 5. On the outside of the power core is a PE sheath.
  • Arranged between the power cores and filling the interstitial zones are three extruded plastic profiles or "fillers" 3. The fillers, when viewed in cross section, have a central, interstices-filling portion 12 as well as two curved "arm" portions 13. The fillers have curved outer surfaces, whereby, when positioned within the cable, the arm portions of adjacent fillers abut to form a continuous circumference radially surrounding the power cores. According to one alternate aspect, the ends of the curved arm portions of the profile, again when viewed in cross section, may be equipped with a "male" protrusion and a "female" indentation, such that adjacent filler profiles interlock. As can be seen in figure 2, the point of abutment of two adjacent arms is immediately between a core and the inner surface of the outer covering.
  • The fillers 3 have a longitudinal, semi-circular curved face 14 along the inner surfaces of the arm and interstices-filling portions of the filler profiles. When adjacent fillers abut one another, the adjacent curved faces 14 create a mostly circular or semi-circular longitudinal channel in which a power core is arranged. An outer covering or server layer 2, made of for example of polypropylene (PP) yarn, polyethylene (PE) sheath or other suitable material surrounds the fillers. The term "suitable" in this connection means that that the material has properties allowing the serving layer to perform the function of mechanical protection and to provide friction for pulling units etc.
  • The extruded filler profiles have a plurality of internal longitudinal walls, forming a honeycombed internal structure comprising a plurality of cells 16.
  • The fillers may optionally comprise one or more spaces formed by adjacent profiles for arranging one or more auxiliary cables such as a fiber optical cable 10.
  • The filler are designed to withstand impact. The fillers according to one aspect are formed of PE or other suitable plastic material.

Claims (9)

  1. A power cable (1) comprising:
    a. a plurality of cores (9), surrounded by an outer covering (2), the area between any two adjacent cores and the immediately opposing inner surface of the outer covering defining an interstitial zone,
    b. a plurality of elongated plastic fillers (3), said fillers having a central, interstices-filling portion (12) arranged to essentially fill an interstitial zone, and two curved, outwardly extending arm portions (13),
    c. at least a part of the arm portions is arranged intermediate the cores and the outer covering, forming a barrier between the cores and the inner surface of the outer covering,
    characterized in that the number of cores (9) as well as the number of fillers (3) is three, and wherein the arm portions (13) of adjacent fillers (3) abutting to form the barrier between the cores (9) and the outer covering (2).
  2. A power cable according to claim 1 wherein two adjacent fillers abut between a core (9) and the inner surface of the outer covering (2).
  3. A power cable according to one of the preceding claims, wherein
    a. the arm portions and the interstices-filling portion have a curved inner surface, and
    b. the curved inner surfaces of the arm portions and interstices-filling portions of adjacent fillers form mostly circular or semi-circular channels, in which channels are arranged the cores.
  4. A power cable according to one of the preceding claims wherein the plastic material of the filler is arranged to withstand and protect against accidental impact against the cable.
  5. A power cable according to one of the preceding claims wherein the fillers comprise a plurality of internal walls 15 defining a plurality of elongated cells 16.
  6. A power cable according to one of the preceding claims, wherein one or more auxiliary cables is arranged in one or more of the elongated cells.
  7. A power cable according to one of the preceding claims wherein the cable is a high voltage cable.
  8. A power cable according to one of the preceding claims wherein the cable is a medium voltage cable.
  9. A power cable according to one of the preceding claims wherein the cable is a low voltage cable.
EP16305537.9A 2016-05-09 2016-05-09 Three core power cables with surrounding plastic filler Revoked EP3244422B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DK16305537.9T DK3244422T3 (en) 2016-05-09 2016-05-09 THREE-CONDUCTOR POWER CABLES WITH SURROUNDING PLASTIC FILLING ELEMENTS
EP16305537.9A EP3244422B1 (en) 2016-05-09 2016-05-09 Three core power cables with surrounding plastic filler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16305537.9A EP3244422B1 (en) 2016-05-09 2016-05-09 Three core power cables with surrounding plastic filler

Publications (2)

Publication Number Publication Date
EP3244422A1 EP3244422A1 (en) 2017-11-15
EP3244422B1 true EP3244422B1 (en) 2020-07-08

Family

ID=55970940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16305537.9A Revoked EP3244422B1 (en) 2016-05-09 2016-05-09 Three core power cables with surrounding plastic filler

Country Status (2)

Country Link
EP (1) EP3244422B1 (en)
DK (1) DK3244422T3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000000343A1 (en) 2020-01-10 2021-07-10 Prysmian Spa Armored cable to carry alternating current
NO20211281A1 (en) * 2021-05-18 2022-11-21 Aker Solutions As Power umbilical and method
GB2606856A (en) 2021-05-18 2022-11-23 Aker Solutions As Power umbilical and method
CN117976302B (en) * 2024-03-29 2024-06-07 金泰电缆有限公司 Shearing-resistant protective aluminum alloy cable

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2304392A (en) * 1995-08-16 1997-03-19 Aker Eng As Heated pipeline assembly
GB2326177A (en) * 1997-04-29 1998-12-16 Kvaerner Oilfield Prod As Dynamic umbilical with load bearing core member
WO2001016515A1 (en) * 1999-08-20 2001-03-08 Kværner Oilfield Products As Production/injection line and methods relating to same
WO2004111515A1 (en) * 2003-06-16 2004-12-23 Aker Kvaerner Subsea As Subsea umbilical
US20050199415A1 (en) * 2004-01-07 2005-09-15 Cable Components Group, Llc Flame retardant and smoke suppressant composite high performance support-separators and conduit tubes
WO2005124095A1 (en) * 2004-06-18 2005-12-29 Aker Kvaerner Subsea As Umbilical
WO2008075964A1 (en) * 2006-12-20 2008-06-26 Aker Subsea As Power umbilical
WO2008075965A1 (en) * 2006-12-20 2008-06-26 Aker Subsea As Umbilical
EP2233810A1 (en) * 2009-03-25 2010-09-29 Nexans External protection for direct electric heating cable
WO2011059337A1 (en) * 2009-10-30 2011-05-19 Aker Subsea As Integrated high power umbilical
WO2012079631A1 (en) * 2010-12-15 2012-06-21 Abb Technology Ag High voltage electric cable
US20130312996A1 (en) 2012-05-24 2013-11-28 Schlumberger Technology Corporation Pressure balanced coiled tubing cable and connection
US8723030B2 (en) * 2009-11-27 2014-05-13 Aker Subsea As Vulcanised power umbilical
WO2014202141A1 (en) 2013-06-19 2014-12-24 Abb Technology Ltd A power cable assembly device and a power cable provided with such a device
WO2015040448A1 (en) * 2013-09-23 2015-03-26 Prysmian S.P.A. Lightweight and flexible impact resistant power cable and process for producing it
WO2015077101A1 (en) * 2013-11-25 2015-05-28 Aker Solutions Inc. Varying radial orientation of a power cable
CN104700942A (en) 2015-03-10 2015-06-10 蒋菊生 Abnormal-shape filling rope for optical cable, cable, photoelectric composite cable or photoelectric comprehensive cable
WO2015104580A2 (en) 2013-12-23 2015-07-16 Technip France Umbilical
WO2015110148A1 (en) 2014-01-21 2015-07-30 Abb Technology Ltd A power cable assembly device and a power cable provided with such a device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9480629B2 (en) 2013-08-06 2016-11-01 Rhodia Operations Sulfate-free structured liquid surfactants

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2304392A (en) * 1995-08-16 1997-03-19 Aker Eng As Heated pipeline assembly
GB2326177A (en) * 1997-04-29 1998-12-16 Kvaerner Oilfield Prod As Dynamic umbilical with load bearing core member
WO2001016515A1 (en) * 1999-08-20 2001-03-08 Kværner Oilfield Products As Production/injection line and methods relating to same
WO2004111515A1 (en) * 2003-06-16 2004-12-23 Aker Kvaerner Subsea As Subsea umbilical
US20050199415A1 (en) * 2004-01-07 2005-09-15 Cable Components Group, Llc Flame retardant and smoke suppressant composite high performance support-separators and conduit tubes
WO2005124095A1 (en) * 2004-06-18 2005-12-29 Aker Kvaerner Subsea As Umbilical
WO2008075964A1 (en) * 2006-12-20 2008-06-26 Aker Subsea As Power umbilical
WO2008075965A1 (en) * 2006-12-20 2008-06-26 Aker Subsea As Umbilical
EP2233810A1 (en) * 2009-03-25 2010-09-29 Nexans External protection for direct electric heating cable
WO2011059337A1 (en) * 2009-10-30 2011-05-19 Aker Subsea As Integrated high power umbilical
US8723030B2 (en) * 2009-11-27 2014-05-13 Aker Subsea As Vulcanised power umbilical
WO2012079631A1 (en) * 2010-12-15 2012-06-21 Abb Technology Ag High voltage electric cable
US20130312996A1 (en) 2012-05-24 2013-11-28 Schlumberger Technology Corporation Pressure balanced coiled tubing cable and connection
WO2014202141A1 (en) 2013-06-19 2014-12-24 Abb Technology Ltd A power cable assembly device and a power cable provided with such a device
WO2015040448A1 (en) * 2013-09-23 2015-03-26 Prysmian S.P.A. Lightweight and flexible impact resistant power cable and process for producing it
WO2015077101A1 (en) * 2013-11-25 2015-05-28 Aker Solutions Inc. Varying radial orientation of a power cable
WO2015104580A2 (en) 2013-12-23 2015-07-16 Technip France Umbilical
WO2015110148A1 (en) 2014-01-21 2015-07-30 Abb Technology Ltd A power cable assembly device and a power cable provided with such a device
CN104700942A (en) 2015-03-10 2015-06-10 蒋菊生 Abnormal-shape filling rope for optical cable, cable, photoelectric composite cable or photoelectric comprehensive cable

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Electric Heating of Pipelines and Large D8 Export Flowlines > 30'' and more than 100 km", OTC 23646, 30 April 2012 (2012-04-30), pages 1 - 16, XP055796775

Also Published As

Publication number Publication date
DK3244422T3 (en) 2020-10-12
EP3244422A1 (en) 2017-11-15

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