EP0980078A1 - Gasisoliertes Verbindungskabel, Herstellungs- und verlegungsverfahren eines derartigen kabels - Google Patents

Gasisoliertes Verbindungskabel, Herstellungs- und verlegungsverfahren eines derartigen kabels Download PDF

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Publication number
EP0980078A1
EP0980078A1 EP99401900A EP99401900A EP0980078A1 EP 0980078 A1 EP0980078 A1 EP 0980078A1 EP 99401900 A EP99401900 A EP 99401900A EP 99401900 A EP99401900 A EP 99401900A EP 0980078 A1 EP0980078 A1 EP 0980078A1
Authority
EP
European Patent Office
Prior art keywords
gas
core
cable
chamber
pneumatic
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.)
Withdrawn
Application number
EP99401900A
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English (en)
French (fr)
Inventor
François Moisson-Franckhauser
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.)
Alcatel Lucent SAS
Nokia Inc
Original Assignee
Alcatel SA
Nokia Inc
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 Alcatel SA, Nokia Inc filed Critical Alcatel SA
Publication of EP0980078A1 publication Critical patent/EP0980078A1/de
Withdrawn legal-status Critical Current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
    • H01B9/00—Power cables
    • H01B9/06—Gas-pressure cables; Oil-pressure cables; Cables for use in conduits under fluid pressure
    • H01B9/0644—Features relating to the dielectric of gas-pressure cables

Definitions

  • the present invention relates to the field gas-insulated cables.
  • Such cables are used for the transport of electrical energy.
  • the general principle of such cables is known in the state of the art, by example by French patent FR2738946 which describes a gas insulated cable with three conductors metallic inside a metallic envelope waterproof, the cable being made of elements of about ten meters in length assembled end to end, ten approximately of elements thus assembled constituting a section of cable.
  • This cable according to the prior art comprises special elements to allow changes in the cable direction.
  • the French patent FR2714204 describes a gas-insulated single-phase cable comprising a cylindrical steel tube filled with nitrogen under a pressure at least equal to 10 4 hectopascals, a metallic conductor based on aluminum. or of copper held axially inside the steel envelope by closed insulating cones, and an aluminum envelope forming for the steel envelope a magnetic screen vis-à-vis the magnetic field created by the current flowing through the conductor.
  • the steel casing is separated from the aluminum casing by rings of charged plastic or polymer material each placed in a groove of a metal collar.
  • the gas-insulated cables (CIG) according to the prior art have a large outside diameter which results from their high voltage and from the limited value of the electric field E 1 admitted in the gas insulation.
  • the outside diameter of the insulation space of these cables is minimized when the core of a unipolar cable subjected to the voltage U has the diameter (2.U / E 1 ) and when the insulation space has for outside diameter (2 U / E 1 ) * exp (1).
  • the object of the invention is to remedy these different drawbacks by offering an insulated cable carbon dioxide of lower manufacturing cost, of a section outer lower than art cable section previous presenting the same performances and whose break is made easier.
  • the invention relates to a gas-insulated cable comprising a core and an outer sheath, the space annular between the core and the envelope being filled an insulating gas, characterized in that the core is surrounded by a pneumatic chamber which presents after inflating a cylindrical shape whose diameter is that cable sheath.
  • the cable has links flexible extending between the conductive core and the wall inside the pneumatic chamber, to ensure the maintaining the conductive core in the center of the space gas insulation after inflation of the chamber pneumatic.
  • the flexible links are made by non-discontinuous glass fabrics, both of which banks were previously drowned in strips narrow side tires of the same type as the pneumatic chamber.
  • the cable has a leaktight tubular wall formed by winding a metal strap around the inflatable structure.
  • the strip is constituted by a stapled tube containing the structure inflatable.
  • the cable further comprises a conductive sheet disposed on along the strip surrounding the inflatable structure.
  • it comprises a structure radially armed tire.
  • the core of the cable is constituted by a cylindrical assembly of conductive strands isolated from each other, and transposed between them, for example inside sectors cylindrical and by an equipotential phase surface produced by taping a semiconductor tape, covered by a mechanically protective coating.
  • the sheath is a tube stapled surrounded by an envelope consisting of conductors arranged in a helix having channels delimited radially by the stapled tube and by the protective envelope, and delimited laterally by lateral spacing between the elements of the sheet sheath conductor.
  • the flexible links are made using insulating fabric obtained from one or more fiber materials.
  • the invention also relates to a method of manufacture of a gas-insulated cable characterized in what we prepare a conductive core and a chamber pneumatic and in that we proceed to the establishment of the pneumatic chamber containing the links in enveloping the soul step by step through the room equipped tire, previously unrolled flat in below the core, the two sides of this room being then arranged edge to edge along an axial line located vertically above the cable core, the pneumatic strips bordering the upper links being superimposed on the banks and made adherent, and in that we then place a cover strip on this set thus prepared.
  • the pneumatic chamber deflated is placed against the conductive core in now simultaneously in final angular position the upper part of the chamber along the axial line as well as the lower part of the cylindrical periphery of the chamber and laterally pressing against the core conductive the deflated pneumatic chamber in the vicinity tapes.
  • the pneumatic chamber forms two pairs of pockets of similar length on either side of each of the two side bands. These four pockets are folded upwards, stacked two by two and pressed against the conductive core, then held in this position for transporting the structure. This fold up prevents folded side parts of the chamber pneumatic encroach on the bottom of the cylindrical periphery of the chamber.
  • the quadruple withdrawal of lateral parts of the chamber also prevents the side links and that the upper links are not tensioned and do not modify the angular position of the strips tires adhering to the chamber and the common anchor tapes.
  • the invention also relates to a method of laying a gas-insulated cable characterized in that the permanent holding of the pneumatic chamber deflated pressed against the conductive core is provided by a plastic film surrounding the deflated structure, this protective film finally tearing when performs partial inflation of the structure during laying of the cable after the end of its development.
  • a deflated structure constituting the cable to using a reel and we proceed to the unwinding.
  • a reel develops the tube stapled around the structure deflated after removal of peripheral links so that the structure can be re-inflated, in that one deposits the deflated structure in an axial position and final angular on the bottom of the stapled tube and in that the winder then installs the web conductive bearing on the stapled tube, then laying the protective envelope.
  • peripheral links surrounding the structure deflated are replaced by a plastic film which continues to wrap the structure during development stapled tube and conductive sheet, this film plastic then tearing under the effect of partial pressurization of the cable.
  • the inflation is carried out partial of the structure taking place before the structure be buried.
  • This structure will also allow achieve electrical insulation including the envelope of gas insulation and spacers will be installed at the factory, thus avoiding access and the risk of contamination during installation of the connection.
  • the inflatable connecting structure is characterized in that each unipolar cable is surrounded by a pneumatic chamber which after inflation a cylindrical shape whose diameter is that of the cable sheath.
  • each unipolar cable is constituted by an elaborate non-waterproof tubular wall in the field, by winding a metal strip around the inflatable structure from the drum.
  • this strip constitutes a tube stapled containing the inflatable structure.
  • This metal strip we have along the straight cable a conductive sheet.
  • This tablecloth lowers the electrical resistance of the sheath. She is surrounded by a structure ensuring the protection of strip and conductive sheet against corrosion and giving the conductive sheet the resistance mechanical to electrodynamic forces created in the presence short-circuit current.
  • the sheath carries a return current which differs little from the current phase; the electrodynamic forces created on the phase conductor tend to center it in the cylindrical volume delimited by the sheath; these forces grow as the driver's initial off-center phase. Given their brevity, and given the mass of the conductor phase, they act especially until the first passage of the soul in a centered position.
  • the shape of the links and their mechanical strength are adapted to the presence of a initial off-center from any direction; the links limit the lateral movement of the conductor phase, so as not to alter the dielectric strength of the link.
  • a variant of this device consists of remove the metal reinforcement used as a sheath and replace the pneumatic chamber mechanically little resistant by a pneumatic structure radially army. Not being able to undergo a temporary deflation at the bottom of trench, such a structural variant cannot be used than in the gallery.
  • the flexible links are produced by means insulating fabric obtained from one or more fiber materials. Material will exhibit toughness sufficient, no long-term creep, resistance to degradation by cable temperature or by electrodynamic vibrations and brittleness reduced compatible with the process of developing the liaison.
  • connection comprising a particular arrangement of links, a particular process for developing the cable and the factory room, and the development of a type particular sheath on the place of installation of the connection.
  • Figure 2 shows a sectional view of the final structure intended to be deposited in the trench after applying reduced pressure to press the pneumatic chamber (6) around the perimeter cylindrical sheath produced by a stapled tube (7) able to contain the forces due to the internal pressure of the insulation gas.
  • a conductive sheet (8) capable of transporting the current of sheath, as well as an envelope (9) protecting the tube stapled (7) and the conductive sheet (8) against corrosion and now mechanically these elements in the presence of a short circuit current.
  • Maintaining the core (1) in a central position in the gas insulation space (10) is obtained by means flexible links (11).
  • the conductive sheet (8) of the sheath is constituted by conductors arranged in a helix.
  • channels (12) are delimited radially by the stapled tube (7) and by the protective envelope (9), and delimited laterally by lateral spacing between the elements of the conductive sheet (8) of the sheath. These channels keep the air pressure around stapled tube despite the tightness of the envelope protection (9).
  • the flexible links (11) are for example produced by non-discontinuous glass fabrics whose two banks were previously drowned in bands narrow side tires of the same type as the pneumatic chamber (6).
  • Figure 3 shows this arrangement of the pneumatic chamber (6) containing the flexible links (11), this room being stored rolled up before being put in place around the core (1) of the cable.
  • the installation of the pneumatic chamber (6) containing the links is done by wrapping close in close to the cable core by the pneumatic chamber fitted, previously unwound flat below the core.
  • the two edges (23, 24) of this chamber are then arranged edge to edge along an axial line (25) located at the vertical above the cable core.
  • Groups tires (19, 20) bordering the upper links are superimposed on the banks (23, 24) and made adherent.
  • a cover strip (26) placed on this assembly fences the pneumatic chamber, ensuring sealing and strengthening the mechanical resistance of this region.
  • the upper links constitute a continuous cradle (27) containing the core (1) of the cable.
  • the lateral links (13) also become tense and prevent lateral movement of the core (1).
  • the central part of these lateral links (13), located between the axial seams (21, 22) is pressed along the underside of the core (1) of the cable; on the part and on the other, the two side parts of the side links (13), located between the seam (21) and the side band (15), and between the seam (22) and the pneumatic strip lateral (16), are distributed along two inclined planes forming the 2 lateral branches of an inverted Y.
  • the adhesion of the cover strip (26) carried out in the factory before cable reel surrounded by the deflated chamber is the only one that requires a seal. Its execution is facilitated by the axial arrangement, without discontinuity, of the links and bands constituting their banks.
  • Figure 4 shows the arrangement of the chamber pneumatic (6) at the level where the upper links (17) are attached to this chamber, forming the upper end (25) from the cradle (27).
  • the connections between the part free of glass fabric (17) and pneumatic strips (19) and (20) are grouped at the upper end (25) of the cylindrical periphery of the pneumatic chamber (6).
  • the pneumatic strips (19) and (20) containing the edges embedded, not overflowing, glass cloth are arranged in T covering the outside face of the chamber pneumatic on either side of this end upper (25).
  • a pneumatic cover strip (26) covers the bands (19) and (20), ensuring sealing and strengthening the mechanical strength of this region.
  • the part of the glass fabric located in the electrical insulation space, suspended at the end upper (25) of the cradle (27) comprises two flat parts of the upper links (11) and (17), on either side of the curvilinear central part in contact with the cable core.
  • Figure 5 shows a section of the cable surrounded by the deflated chamber, and suitable for being rolled up on a reel.
  • the cable core arranged horizontally rests on the lower end (36) of the periphery cylindrical of the pneumatic chamber. Bedroom deflated surrounds the sides of the core (1) of the cable.
  • the glass fiber upper links (17) fixed to the chamber deflated are present between the core (1) and the chamber deflated. They are not mechanically stressed. For that the lateral links (13) do not hinder the folding of the deflated pneumatic chamber (6), the walls of the pneumatic chamber (6) are also supported on the cable core at the axial seams (21) and (22).
  • the core (1) of the cable Before placing on a reel, the core (1) of the cable based on a single thickness of the pneumatic chamber deflated (6). Maintaining an angular position unchanged after unwinding of the drum, on the ground of installation, thus avoiding the final inflation of the structure creates a rotation of the core (1) of the cable or of the chamber pneumatic (6).
  • Figure 6 shows the installation site a connection, with the trench (40) which contains a part of the connection cables, already in place.
  • the development of the connection is carried out along a track (41) parallel to the trench (40).
  • a reel (42) has been routed on this track.
  • the deflated structure (33) contains the deflated structure (33).
  • the unfolding takes place by visually checking that the upper position of the upper end (25) of the periphery of the room is respected.
  • the winder (43) develops the stapled tube (7) around the deflated structure (33) after the elimination of the peripheral links (32) so that the structure can be re-inflated.
  • the deflated structure (33) then rests in the final axial and angular position on the bottom (44) of the stapled tube.
  • the four lengths surplus (28 to 31) of the deflated chamber do not encroach under the bottom (44) and will therefore not induce of rotation of the structure upon inflation.
  • the peripheral links (32) can be constituted by a protective plastic film; this film tears when the inflation of the structure begins.
  • the winder (43) then performs the installation of the conductive sheet (8) bearing on the stapled tube (7), then the installation of the protective envelope (9).
  • the trench depth has little influence on the elimination of the heat; this depth which depends on the diameter of the cables, the maximum pressure allowed and therefore of the nature of the electrical insulating gas, may be then chosen in order to eliminate the risk run above a cable in the event of accidental rupture of its enclosure pressurized.

Landscapes

  • Cable Accessories (AREA)
  • Installation Of Bus-Bars (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Electric Cable Installation (AREA)
EP99401900A 1998-08-10 1999-07-26 Gasisoliertes Verbindungskabel, Herstellungs- und verlegungsverfahren eines derartigen kabels Withdrawn EP0980078A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9810241A FR2782188A1 (fr) 1998-08-10 1998-08-10 Cable de liaison a isolation gazeuse, procede de fabrication et de pose d'un tel cable
FR9810241 1998-08-10

Publications (1)

Publication Number Publication Date
EP0980078A1 true EP0980078A1 (de) 2000-02-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99401900A Withdrawn EP0980078A1 (de) 1998-08-10 1999-07-26 Gasisoliertes Verbindungskabel, Herstellungs- und verlegungsverfahren eines derartigen kabels

Country Status (4)

Country Link
EP (1) EP0980078A1 (de)
JP (1) JP2000069653A (de)
CA (1) CA2279105A1 (de)
FR (1) FR2782188A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016096314A1 (de) * 2014-12-16 2016-06-23 Siemens Ag Anordnung aufweisend einen fluidisolierten phasenleiter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117292880B (zh) * 2023-10-23 2024-05-07 深圳市东佳信电线电缆有限公司 一种柔性抗弯折的高压电缆
CN118858722B (zh) * 2024-09-24 2024-12-06 洛阳千诺电气设备有限公司 一种全绝缘移动式计量箱及使用方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569875A (en) * 1969-02-10 1971-03-09 Nasa Collapsible antenna boom and transmission line
DE4413530A1 (de) * 1994-04-15 1995-10-19 Siemens Ag Abstützsystem für einen Hochspannungsleiter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569875A (en) * 1969-02-10 1971-03-09 Nasa Collapsible antenna boom and transmission line
DE4413530A1 (de) * 1994-04-15 1995-10-19 Siemens Ag Abstützsystem für einen Hochspannungsleiter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016096314A1 (de) * 2014-12-16 2016-06-23 Siemens Ag Anordnung aufweisend einen fluidisolierten phasenleiter
CN107210094A (zh) * 2014-12-16 2017-09-26 西门子公司 具有流体绝缘的相导体的装置
US10109991B2 (en) 2014-12-16 2018-10-23 Siemens Aktiengesellschaft Arrangement comprising a fluid-insulated phase conductor
CN107210094B (zh) * 2014-12-16 2021-12-17 西门子能源全球有限公司 具有流体绝缘的相导体的装置

Also Published As

Publication number Publication date
CA2279105A1 (fr) 2000-02-10
FR2782188A1 (fr) 2000-02-11
JP2000069653A (ja) 2000-03-03

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