EP1783786A2 - Système de câble avec un écran magnétique - Google Patents

Système de câble avec un écran magnétique Download PDF

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Publication number
EP1783786A2
EP1783786A2 EP06022902A EP06022902A EP1783786A2 EP 1783786 A2 EP1783786 A2 EP 1783786A2 EP 06022902 A EP06022902 A EP 06022902A EP 06022902 A EP06022902 A EP 06022902A EP 1783786 A2 EP1783786 A2 EP 1783786A2
Authority
EP
European Patent Office
Prior art keywords
voltage cable
cable according
shielding
tube
cores
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.)
Granted
Application number
EP06022902A
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German (de)
English (en)
Other versions
EP1783786B1 (fr
EP1783786A3 (fr
Inventor
Erfindernennung liegt noch nicht vor Die
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.)
NKT Cables GmbH and Co KG
Original Assignee
NKT Cables GmbH and Co KG
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 NKT Cables GmbH and Co KG filed Critical NKT Cables GmbH and Co KG
Publication of EP1783786A2 publication Critical patent/EP1783786A2/fr
Publication of EP1783786A3 publication Critical patent/EP1783786A3/fr
Application granted granted Critical
Publication of EP1783786B1 publication Critical patent/EP1783786B1/fr
Not-in-force 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
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/023—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of helicoidally wound tape-conductors

Definitions

  • the invention relates to a cable system, in particular for three-phase current with magnetic shielding shell.
  • High-voltage cables are advantageous over overhead lines because they do not generate an electric field in their environment.
  • the low frequency external magnetic field generated by the cable currents is present.
  • a well-known shielding measure is the insertion of the cables in a steel tube with three stranded and steel wire-reinforced 110 kV cable wires: Brochure (1999), No. E21.2d 1.0; "City cable” of the company nkt cables GmbH, Cologne.
  • the steel tube has a magnetic shielding, but this construction is expensive and has other disadvantages, such as the need to weld together short, rigid steel pipe sections and protect the steel pipes against corrosion.
  • the particles are placed in a braided screen, either introducing the particles into the mesh or gaps of the screen, or adhering the particles to the mesh. Both are very complex and therefore disadvantageous process steps.
  • the essence of the invention consists in that at least one layer comprising the cable cores, hereinafter referred to as a sheath shell, is applied as a winding of at least one band of magnetically highly permeable material.
  • a cable construction according to the invention can be provided in which three stranded and steel wire-reinforced cable cores are drawn into an outer tube.
  • the structure is such that below one steel wire reinforcement one or more layers of so-called electrical tapes are applied, optionally in combination with compensation conductors or conductive layers.
  • Such electrical bands consist of low silicon silicon steel strip ( ⁇ 2.5%) and are made in a thickness of 0.02 to 0.04 mm. They are cold-rolled, grain-oriented or non-grain-oriented and have excellent magnetic properties such as high permeability and low core loss.
  • the electrical tapes to be used have good mechanical resistance and a favorable price. They already have a very thin (micrometer-range) insulating layer from the manufacturing process, but can also be surface-coated by additional processes, for example galvanized.
  • the effect of the magnetic shield is optimal if the cable system does not carry zero current. This should be the case for an "ideal" three-phase system.
  • Important in the case of the magnetic shielding of a three-phase cable is that all three cable cores are jointly covered by the high-permeability shielding sheath. Therefore, the shielding tapes are wound over the three stranded cable cores.
  • Occurring zero currents in a three-phase system can only be shielded by inducing countercurrents in highly conductive electrical conductors in their environment which compensate the magnetic field by means of an opposing field. This also applies to other than three-wire cable construction, where there is no symmetry of the magnetic fields emanating from the cable cores.
  • a small lay length in grain-oriented tapes is critical to guiding the circular magnetic field in the preferred magnetic direction (this is the longitudinal direction) of the tapes. Even with non-grain oriented tapes, the magnetic resistance of the layer is minimized by a short lay length.
  • the advantage of a short lay length is also that the bands can move against each other when bending the cable.
  • the straps of the magnetic shielding sheath are to be applied with a short lay length, they can not take over the function of a reinforcement to absorb and retain tensile forces from the cable ends when pulling in the cables, therefore, the reinforcement is added to the cable structure.
  • the magnetic shielding measures described above can also be carried out for two cable cores adjacent to one another in a single-conductor or two-core cable construction, one of which carries the current in one direction and the other returns the current, as in the case of a single-phase AC system or a bipolar DC system is the case.
  • Fig. 1 shows a high voltage cable for three-phase current with three stranded wires 1, a magnetically shielding layer 2 (Schirmungshülle) and a reinforcement 3, wherein the reinforcement has to take over the task of Jardinyakierin where the cable in cable trenches, in pipes or culverts is retractable.
  • the conductors of the wires are insulated as usual and the insulation provided with inner and outer conductive layer.
  • a magnetically shielded, armored three-conductor cable is shown in the partial figure 1A.
  • Sub-figure 1 B corresponds to 1A, but in addition with a highly conductive layer 4 below the belt layer.
  • the subfigure 1C differs from subfigure 1A by an additional compensation conductor 5 within the band layer.
  • Fig. 2 shows a magnetically shielded arrangement in the socket area.
  • An outer shielding tube 6 for the sleeve shield and sleeves 7 are shown.
  • FIG. 1A shows a first variant of the solution with reinforcement located above the shielding shell.
  • This reinforcement can consist of strips or wires, for example made of steel or bronze, preferably also formed as a flat wire.
  • reinforcement and shielding shell complement each other both electromagnetically and mechanically.
  • the magnetic shield In the socket areas, the magnetic shield must be interrupted by settling the reinforcement and the shielding shell, so that additional measures must be taken here.
  • An effective shielding within this range can be achieved as shown in Fig. 2: over the entire sleeve assembly, a magnetically effective tube 6 is pushed.
  • This pipe can be a steel pipe with the required wall thickness. But it can also be configured as a plastic composite pipe by a plastic pipe is wrapped with one or more layers of electrical tapes, similar to the stranded cable wires 1 in the other areas.
  • the outer shielding tube 6 is magnetically tightly connected at its ends with the Schirmungshülle 2 of the cable cores. From the point of view of magnetic shielding, it is sufficient if the outer shielding tube 6 overlaps the offset ends of the shielding sheath of the cable cores by a length corresponding to its diameter. Under grounding considerations, it will be useful to electrically connect the outer shielding tube to the shielding sheath of the cable cores.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
EP20060022902 2005-11-04 2006-11-03 Système de câble avec un écran magnétique Not-in-force EP1783786B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005053050 2005-11-04

Publications (3)

Publication Number Publication Date
EP1783786A2 true EP1783786A2 (fr) 2007-05-09
EP1783786A3 EP1783786A3 (fr) 2010-07-14
EP1783786B1 EP1783786B1 (fr) 2014-09-03

Family

ID=37719942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060022902 Not-in-force EP1783786B1 (fr) 2005-11-04 2006-11-03 Système de câble avec un écran magnétique

Country Status (1)

Country Link
EP (1) EP1783786B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102074298A (zh) * 2010-12-29 2011-05-25 金坛市金鹿电缆材料有限公司 一种三重屏蔽阻燃型核电专用电力电缆
EP2333792A1 (fr) * 2009-12-14 2011-06-15 Nexans Agencement doté de câbles supraconducteurs
WO2013072124A1 (fr) * 2011-11-14 2013-05-23 Nv Bekaert Sa Fil d'acier destiné à l'absorption de champs magnétiques
CN104616815A (zh) * 2015-01-30 2015-05-13 安徽华能电缆集团有限公司 一种船舶用屏蔽铠装控制电缆

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH346920A (de) * 1955-09-05 1960-06-15 Siemens Ag Bewehrtes mehradriges Hochspannungskabel mit kunststoffisolierten Litzenleitern
DE3123040A1 (de) * 1981-06-11 1983-01-05 Vacuumschmelze Gmbh, 6450 Hanau Magnetisch abgeschirmtes kabel mit einer abschirmungaus weichmagnetischem material
DE19807527A1 (de) * 1998-02-21 1999-08-26 Cit Alcatel Elektrische Leitung oder elektrisches Kabel
EP1191546A1 (fr) * 2000-09-25 2002-03-27 NKT Power Cables A/S Câble d' énergie à haute tension
AU2002345061B2 (en) * 2001-06-29 2007-08-23 Prysmian Cavi E Sistemi Energia S.R.L. Method for shielding the magnetic field generated by an electrical power transmission line, and magnetically shielded electrical power transmission line

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2333792A1 (fr) * 2009-12-14 2011-06-15 Nexans Agencement doté de câbles supraconducteurs
CN102074298A (zh) * 2010-12-29 2011-05-25 金坛市金鹿电缆材料有限公司 一种三重屏蔽阻燃型核电专用电力电缆
CN102074298B (zh) * 2010-12-29 2013-02-13 金坛市金鹿电缆材料有限公司 一种三重屏蔽阻燃型核电专用电力电缆
WO2013072124A1 (fr) * 2011-11-14 2013-05-23 Nv Bekaert Sa Fil d'acier destiné à l'absorption de champs magnétiques
CN104616815A (zh) * 2015-01-30 2015-05-13 安徽华能电缆集团有限公司 一种船舶用屏蔽铠装控制电缆

Also Published As

Publication number Publication date
EP1783786B1 (fr) 2014-09-03
EP1783786A3 (fr) 2010-07-14

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