WO2010149229A1 - Câble électrique - Google Patents

Câble électrique Download PDF

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Publication number
WO2010149229A1
WO2010149229A1 PCT/EP2009/058070 EP2009058070W WO2010149229A1 WO 2010149229 A1 WO2010149229 A1 WO 2010149229A1 EP 2009058070 W EP2009058070 W EP 2009058070W WO 2010149229 A1 WO2010149229 A1 WO 2010149229A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
end part
insulation layer
electrical cable
layer
Prior art date
Application number
PCT/EP2009/058070
Other languages
English (en)
Inventor
Marc Jeroense
Thomas Christen
Jonas Jonsson
Robert Leandersson
Magnus Lindgren
Original Assignee
Abb Research Ltd
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 Abb Research Ltd filed Critical Abb Research Ltd
Priority to PCT/EP2009/058070 priority Critical patent/WO2010149229A1/fr
Publication of WO2010149229A1 publication Critical patent/WO2010149229A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/184—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress

Definitions

  • the present invention relates to an electrical cable for DC high voltage applications and a method for manufacturing an electrical cable.
  • Electrical cables for DC high voltage applications usually comprise a conductor, an inner semiconductive layer next to and surrounding said conductor, an insulation layer next to and surrounding said inner semiconductive layer and an outer semiconductive layer next to and surrounding said insulation layer.
  • This first method can only be uti lized for joints nts and is based on creating a cable structure by means of step-wise vu l ca n i zati o n of th e d iffe re n t l aye rs .
  • Th e m eth od comprises step-wise removal of the outer semiconductive layer, the insulation layer and the inner semiconductive layer at the ends of the electrical cables to be jointed.
  • the cond uctors are thereafter suitably connected and the respective layers are re-created by step-wise application of band shaped vulcanization materials. This method is time consuming due to the fact that the different layers have to be vu lcan ized separately.
  • the method is also dependent upon the skills of the operator creating the joint. 2.
  • This other method is used for both terminations and joints and initially it comprises a removal of the outer semiconductive layer as in the method first described at an axial end of the cable/cables.
  • a prefabricated accessory in the form of for instance a stress cone, is thereafter arranged at the cable end/ends.
  • the prefabricated accessory comprises insulation material and semiconductive layers.
  • This contact is only physical and such a contact limits the capacity of the insulation material.
  • This method is less time consuming in comparison with the first method but the drawback is that the connecting part of the electrical cable/cables has a significantly lower performance.
  • the object of the present invention is to provide a new electrical cable for DC high voltage applications suitable for the creation of a cable joint and/or a cable termination.
  • an electrical cable having the features defined in claim 1, wherein the electrical cable comprises a conductor, an inner semiconductive layer next to and surrounding the conductor, an insulation layer next to and surrounding said inner semiconductive layer, an outer semiconductive layer next to and at least partly surrounding said insulation layer.
  • the electrical cable has at least at one of its ends a cable end part, in which said insulation layer is at least 10% thicker than in parts of the electrical cable adjacent to said cable end part.
  • the electrical cable as disclosed above is ideal for use with a prefabricated accessory since the thicker insulation layer causes a lowering of the radial electric field which always arises at a physical interface between a prefabricated accessory and a cable end to which said accessory is attached when the electrical cable is in use.
  • the cable end part has an extension in the longitudinal direction of the electrical cable of at least 0.1 m, preferably at least 0.3 m, most preferred at least 0.5 m.
  • the cable end part with a thickened insulation layer has to be of a certain length for achieving lowering of the radial electric field at the physical interface between the prefabricated accessory and the cable end part.
  • the cable end part should have an axial length of at least half the length of the accessory to be attached to the electrical cable.
  • the cable end part is configured for being connected to a prefabricated accessory, whereby a physical interface is created between the cable end part and said accessory.
  • the additional th i ckness of the i nsu lation layer of the ca ble en d pa rt as compared to the thickness of the insulation layer in parts of the electrical cable adjacent to said cable end part is given by the equation (i)
  • E 1 is the maximum allowable radial design electric field of the physical interface (10) of the electrical cable (1 ) at said cable end part (6)
  • E c is the electrical field at the physical interface (10) of a similar electrical cable which not has said additional thickness (D).
  • the radial design field is the acceptable field for the accessory to work safely and the electrical field at said physical interface is the calculated field at the interface of a given cable connection. If E c is higher than E 1 the accessory will not work properly , and the fi el d at the physical interface must thereby be decreased. This decrease is achieved by the thickening of the insulation layer of the cable end part according to the equation (i).
  • the cable end part is config u red for bei ng con nected to a prefa bri cated accessory in the form of a cable joint or a cable termination.
  • the insulation layer in the cable end part comprises a polymeric material.
  • the i nsu lation layer of a ca ble usual ly comprises a polymeri c material, for instance a cross-lin ked polyethylene, a thermoplastic polyethylene or a thermoplastic polypropylene.
  • a polymeric material provides good electrical insulating properties for the electrical cable.
  • the outer semiconductive layer partly surrounds said insulation layer of the cable end part.
  • a complementary outer semiconductive layer is thus added outside and surrounding said insulation layer.
  • the outer semiconductive layer orients the electrical field radially which is advantageous from an insulation point of view.
  • the cable end part has a conical shape tapering towards the cable end.
  • This a rran g ement provid es for fu rther red ucti on of th e rad i a l electrical field when the cable joint or termination is in use, because of the fact that electric field vectors perpendicular to the created interface does not point in the radial direction.
  • a further object of the present invention is to provide a method for manufacturing a thickened end part on an electrical cable.
  • the electrical cable comprises a conductor, an inner semiconductive layer next to and surrounding the conductor, an insulation layer next to and surrounding said inner semiconductive layer, an outer semiconductive layer next to and at least partly surrounding said insulation layer, wherein the method comprises the steps of:
  • a cable having a cable end part produced using this method is suitable for use together with an accessory for jointing cables and/or cable termination as discussed above. If the polymer tape and the exposed insulation layer are bonded to each other chemically the radial electric field will be significantly lowered in the physical interface between the cable end part and an accessory to which the cable end part is connected.
  • the method comprises the step of chemically binding the polymer tape to the exposed insulation layer by vulcanization. Vulcanization is a reliable way to create a suitable interface with chemical bonds between the polymer tape and the exposed insulation layer.
  • the method further comprises the step of removing parts of the exposed insulation layer of the cable end part prior to winding the polymer tape around it.
  • the removal of parts of the exposed insulation layer creates a remainder of exposed insulation which has a conical shape around the inner semiconductive layer.
  • the method comprises the step of providing a complementary outer semiconductive layer next to and surrounding said polymer layer.
  • the outer semiconductive layer helps reducing the radial electrical field when the cable is in use together with for instance an accessory as mentioned above.
  • the complementary outer semiconductive layer is provided by means of vulcanization.
  • vulcanization the complementary outer semiconductive layer is chemically bonded to the outer semiconductive layer of the electrical cable.
  • Fig 1 shows an electrical cable according to a first embodiment of the invention
  • Fig 2 shows an electrical cable according to a second embodiment of the invention
  • Fig 3 shows an electrical cable according to a third embodiment of the invention
  • Fig 4 shows an electrical cable according to an embodiment of the invention inserted into an accessory in the form of a stress cone
  • Fig 5 shows two electrical cables according to an embodiment of the invention jointed by an accessory in the form of a cable joint.
  • Fig 1 sh ows an electrical cable 1 for DC high voltage applications, wherein the electrical cable comprises a conductor 2, e.g. of aluminium or copper, an inner semiconductive layer 3, which purpose is to even out the electrical field, next to and surrounding the conductor 2, an insulation layer 4, preferably comprising a polymeric i nsu lation material e .g . cross-linked polyethylene, next to and surrounding said inner semiconductive layer 3, an outer semiconductive layer 5 next to and at least partly surrounding said insulation layer 4 to make the electrical field radial which is advantageous from an insulation point of view.
  • the electrical cable can also have other outer layers for instance for protecting the cable.
  • the electrical cable 1 has at l east at on e of its en d a ca bl e en d pa rt 6 , i n wh i ch sa i d insulation layer 4 is at least 10% thicker than in parts 7 of the electrical cable 1 adjacent to said cable end part 6.
  • the cable end part 6 has an extension in the longitudinal direction of the electrical cable 1 of at least 0.1 m, preferably at least 0.3 m, most preferred at least 0.5 m.
  • the additional thickness of the insulation layer 4 of the cable end part 6 as compared to the thickness of the insulation layer 4 in parts 7 of the electrical cable 1 adjacent to said cable end part 6 is roughly given by the equation (i)
  • Ej ⁇ E c
  • D is the additional thickness of said insulation layer in the cable end part
  • d is the thickness of the insulation layer in parts of the electrical cable adjacent to said ca ble end part
  • E 1 is the maximum allowable radial design electric field of the physical interface (10) of the electrical cable (1) at said cable end part (6)
  • E c is the electrical field at the physical interface (10) of a similar electrical cable which not has said additional thickness (D).
  • FIG 2 it is shown an electrical cable 1 according to another embodiment of the invention.
  • the electrical cable of Fig 2 is similar to the electrical cable of Fig 1, but in the electrical cable of Fig 2 an interface 8 between an original insulation layer 4a, here also denominated exposed insulation layer, of an electrical cable 1 and an additional insulation layer 4b, here also denominated polymer layer, is shown.
  • This interface 8 is a chemical interface, i.e. the original insulation layer 4a is chemically bonded to the additional insulation layer 4b.
  • the interface 8 is conically arranged parallel to the axial direction of the electrical cable 1, but this interface can of course be arranged in other ways, for instance conically which is shown in Fig 3.
  • the invention also relates to a method for manufacturing a thickened cable end part 6 on an electrical cable 1.
  • the method can be understood by viewing Figs 2 and 3.
  • an ordinary electrical cable for DC high voltage applications is used.
  • the electrical cable comprises a conductor 2, an inner semiconductive layer 3 next to and surrounding the conductor 2, an insulation layer 4a next to and surrounding said inner semiconductive layer 3, an outer semiconductive layer 5a next to and at least partly surrounding said insulation layer 4a.
  • the method comprises the steps of:
  • the method further comprises the step of removing parts of the exposed insulation layer 4a of the cable end part 6 prior to winding the polymer tape around it.
  • the removal of parts of the exposed insulation layer 4a creates a remainder of exposed insulation 4a which has a conical shape around the inner semiconductive layer 3.
  • the method can also comprise the step of providing a complementary outer semiconductive layer 5b, prefera bly by vu lcan ization , next to and su rrou nd i ng said polymer layer 4b.
  • the complementary outer semiconductive layer 5b can also be the original outer semiconductive layer 5a, which has been temporarily removed during the production of the polymer layer 4b.
  • the polymer layer 4b can of course also be added as a prefabricated body which is vulcanized , e.g . press vulcanized, to the exposed insulation layer 4a to produce a thickened cable end part 6 on an electrical cable 1 .
  • Fi g 4 it i s shown an electri ca l ca ble 1 accord i n g to an embodiment of the invention inserted into an accessory in the form of a stress cone 9.
  • the stress cone 9 can for instance be a part of a termination.
  • a physical interface 10 is created between the stress cone 9 and the outer surface of the cable end part 6.
  • the outer surface mentioned can be the outer surface of the insulation layer 4, but there can also be an outer semiconductive layer between said insulation layer 4 and the stress cone 9.
  • Fig 5 it is shown two essentially identical electrical cables 1 according to an em bod i ment of the invention jointed by an accessory in the form of a cable joint 1 1 .
  • a physical interface 12 is created between the cable joint 1 1 and the outer surface of the cable end part 6.
  • the outer surface mentioned can be the outer surface of the insulation layer 4, but there can also be an outer semiconductive layer between said insulation layer 4 and the cable joint 11.

Landscapes

  • Processing Of Terminals (AREA)
  • Cable Accessories (AREA)

Abstract

L'invention porte sur un câble électrique (1) pour des applications haute tension à courant continu. Le câble électrique comprend un conducteur (2), une couche semi-conductrice interne (3) adjacente au conducteur (2) et l'entourant, une couche isolante (4) adjacente à et entourant ladite couche semi-conductrice interne (3), une couche semi-conductrice externe (5) adjacente à et entourant au moins partiellement ladite couche isolante (4), le câble électrique (1) comprenant, au niveau d'au moins l'une de ses extrémités, une partie d'extrémité de câble (6) dans laquelle ladite couche isolante (4) est au moins 10% plus épaisse que dans des parties (7) du câble électrique (1) adjacente à ladite partie d'extrémité de câble (6).
PCT/EP2009/058070 2009-06-26 2009-06-26 Câble électrique WO2010149229A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/058070 WO2010149229A1 (fr) 2009-06-26 2009-06-26 Câble électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/058070 WO2010149229A1 (fr) 2009-06-26 2009-06-26 Câble électrique

Publications (1)

Publication Number Publication Date
WO2010149229A1 true WO2010149229A1 (fr) 2010-12-29

Family

ID=41527643

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/058070 WO2010149229A1 (fr) 2009-06-26 2009-06-26 Câble électrique

Country Status (1)

Country Link
WO (1) WO2010149229A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013182829A1 (fr) * 2012-06-08 2013-12-12 Nexans Dispositif comprenant une couche piégeuse de charges d'espace
US20140124263A1 (en) * 2011-03-01 2014-05-08 Prysmian S.P.A. Joint for hv cables insulated with impregnated paper or paper-polypropylene laminate (ppl)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3356788A (en) * 1963-11-19 1967-12-05 Aluminum Co Of America Stress relief cones for high voltage, shielded conductors
EP0510453A1 (fr) * 1991-04-25 1992-10-28 Fujikura Ltd. Ligne de câbles d'alimentation électrique et une méthode pour sa fabrication
EP0742628A1 (fr) * 1995-05-08 1996-11-13 NKT Cables A/S Procédé de préparation d'une extrémité de câble ainsi que manchon pour câble à haute tension

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3356788A (en) * 1963-11-19 1967-12-05 Aluminum Co Of America Stress relief cones for high voltage, shielded conductors
EP0510453A1 (fr) * 1991-04-25 1992-10-28 Fujikura Ltd. Ligne de câbles d'alimentation électrique et une méthode pour sa fabrication
EP0742628A1 (fr) * 1995-05-08 1996-11-13 NKT Cables A/S Procédé de préparation d'une extrémité de câble ainsi que manchon pour câble à haute tension

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140124263A1 (en) * 2011-03-01 2014-05-08 Prysmian S.P.A. Joint for hv cables insulated with impregnated paper or paper-polypropylene laminate (ppl)
US9306382B2 (en) * 2011-03-01 2016-04-05 Prysmian S.P.A. Joints for high voltage cables insulated with impregnated paper or paper-polypropylene laminate (PPL)
WO2013182829A1 (fr) * 2012-06-08 2013-12-12 Nexans Dispositif comprenant une couche piégeuse de charges d'espace
FR2991808A1 (fr) * 2012-06-08 2013-12-13 Nexans Dispositif comprenant une couche piegeuse de charges d'espace
CN104350655A (zh) * 2012-06-08 2015-02-11 尼克桑斯公司 包括空间电荷捕获层的设备
JP2015525554A (ja) * 2012-06-08 2015-09-03 ネクサン 空間電荷トラップ層を包含するデバイス
US9748758B2 (en) 2012-06-08 2017-08-29 Nexans Device comprising a space charge trapping layer

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