EP0290343B1 - Anordnung bestehend aus einem abschirmantel fur ein kabel und damit verbundene verschraubung - Google Patents

Anordnung bestehend aus einem abschirmantel fur ein kabel und damit verbundene verschraubung Download PDF

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Publication number
EP0290343B1
EP0290343B1 EP19880401091 EP88401091A EP0290343B1 EP 0290343 B1 EP0290343 B1 EP 0290343B1 EP 19880401091 EP19880401091 EP 19880401091 EP 88401091 A EP88401091 A EP 88401091A EP 0290343 B1 EP0290343 B1 EP 0290343B1
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EP
European Patent Office
Prior art keywords
assembly
distinction
accordance
layer
mumetal
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EP19880401091
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English (en)
French (fr)
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EP0290343A1 (de
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Christian Lesage
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/10—Screens specially adapted for reducing interference from external sources

Definitions

  • the present invention relates to an assembly of a cable shielding sheath for protection against electromagnetic radiation, in particular in the range of myriametric and kilometer waves and of a screw connection.
  • a particular problem to be solved is that of the hardening to electromagnetic interference (EMI) of very low frequency (VLF) and low frequency (LF) reception or emission installations as well as acoustic detection installations, or any other system operating in these frequency ranges.
  • EMI electromagnetic interference
  • hardening that is to say insensitivity to electromagnetic interference operating at low and very low frequencies, consists in shielding the cables with metal steel tubes in the straight part of their path. In the bent parts of the wiring, a flexible austenitic stainless steel pipe is used.
  • the flexible austenic stainless steel tube is of little interest by the very fact that the magnetic permeability of these stainless steels is close to 1.
  • Document FR-A-2 520 548 describes a concentric multilayer shielding sheath containing a screen with a high coefficient of magnetic permeability formed by the alternating superposition of layers formed of homogeneous spindles of non-ferromagnetic conductive elements and layers formed of ferromagnetic elements .
  • Patent FR 2 532 463 is also known, which describes a cable protection sheath against electromagnetic disturbances and corrosion, having a characteristic combination of ferromagnetic layers with low magnetizing power, such as mild steel, and with high magnetizing power, such as silicon steel, inserted in a conductive filler material itself comprised between two layers of conductive plastic. This sheath is not suitable for low frequency electromagnetic radiation.
  • the shielding efficiency in the frequencies from 10 to 100 kHz is significantly improved when using a screen with a high coefficient of magnetic permeability.
  • the H component of the electromagnetic wave is more active at low frequencies than at high frequencies.
  • Optimal shielding efficiency is obtained if the electric field and the magnetic field of the wave are attenuated on the one hand.
  • Patent FR 2 461 342 describes, however, a cable with high immunity against electromagnetic radiation.
  • the cable is coated with a flexible coating which mainly comprises a composite magnetic material comprised between two flexible conductive shields.
  • this coating is mechanically linked to the conductor cable and does not have the possibility of radial elasticity for its adaptation to cables of even slightly different dimensions.
  • the present invention overcomes the drawbacks mentioned above by proposing a sheath having a certain flexibility, both axial and radial, allowing its adaptation to various types and configurations of cables, which offers effective protection of these cables against electromagnetic radiation in the range of myriametric and kilometer waves, and which can be fitted with standard fittings.
  • the invention therefore relates to an assembly according to claim 1.
  • the screen is made up of two superimposed bands of metal wound in contiguous turns, placed between two tinned copper braids.
  • the shielding sheath makes it possible to harden an installation in a homogeneous manner. It has a certain flexibility which allows the same product to be used over the entire length of the wiring (straight or curved part), and can be fitted with fittings provided with a flexible contact at the junction of the crimping body and the part threaded connection which facilitate the implementation of the product.
  • fittings adapted to each type of socket or cable gland enhances the overall efficiency of hardening, improving electromagnetic immunity by limiting the risk of electromagnetic leakage.
  • the shielding sheath is composed of concentric layers from the inside to the outside, defined as follows, around an electric cable 20.
  • the first layer 1 is a 2 mm diameter stainless steel wire wound in a helix with a pitch of 10 mm.
  • the purpose of this wire is to ensure mechanical resistance of the product to radial forces.
  • the second layer 2 is an insulating film which has the function of avoiding direct contact with the stainless steel wire and the elastomer and which may be necessary in the production.
  • a third layer 3 of elastomer which is a self-extinguishing silicone gum and exhibiting no release of halogen or toxic gas.
  • the fourth layer 4 is a very thin insulating film which separates the upper layer of copper from the elastomer. This film facilitates the stripping of the sheath.
  • the screen with a high coefficient of permeability follows a fifth layer 5 which is a tinned copper braid with a high recovery rate.
  • strip 7 of mumetal identical to the strip 6 is to ensure recovery of the contiguous part of the preceding strip.
  • the metal can be replaced by an iron-nickel-boron alloy with an amorphous structure, possibly containing phosphorus like that known under the trade name "MET GLAS", which then retains a high magnetic permeability even after possible mechanical deformation.
  • MET GLAS iron-nickel-boron alloy with an amorphous structure, possibly containing phosphorus like that known under the trade name "MET GLAS", which then retains a high magnetic permeability even after possible mechanical deformation.
  • the screen is covered with a braid 8 of tinned copper with a high recovery rate, itself covered with a layer 9 identical to layer 2, and with a layer 10 of elastomer identical to layer 3.
  • a coating 11 must resist mechanical and chemical attack, in particular from the military environment.
  • FIG. 2 shows a specific fitting 21 adapted to the sheath according to the invention, comprising a crimping zone 22 separated from a threaded ring 23, by a flexible contact 24 made for example of phosphorous bronze or copper, to ensure galvanic continuity between the crimping zone 22 and the ring 23.
  • a steel ring 25 ensures the mechanical retention of the parts 22 and 23.
  • the threaded ring allows mechanical connection to a cable gland 26.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Claims (9)

  1. Montage von konzentrischen, mehrschichtigen, elastischen Abschirmungsmänteln für Stromkabel (20), insbesondere zum Schutz gegen elektromagnetische Strahlung bei niedrigen Frequenzen, wobei die Mäntel zwischen zwei Isolierschichten (2-4, 9-10) über einen Schirm (5-8) mit einem hohen magnetischen Durchlässigkeitskoeffizienten verfügen, der aus mindestens zwei Streifen aus Eisen-Nickel-Legierung mit Gefügeausbildung oder aus einer strukturlosen Eisen-Nickel-Bor-Legierung besteht, die zwischen zwei Metallgeflechten (5, 8) mit geringer elektrischer Leitfähigkeit und hohem Überdeckungsvermögen angeordnet sind, und wobei die Montage über Schraubverbinder verfügt, dadurch gekennzeichnet, dass die Schraubverbinder aus einem rostfreien, martinsitischen oder ferritischen Werkstoff bestehen, ausserdem durch Magnetformung aufgequetscht sind, und an der Verbindung des Einpackungskörpers mit dem Gewindeteil des Verbinders über einen elastischen Stromkontakt (24) verfügen.
  2. Montage gemäss dem Anspruch 1, dadurch gekennzeichnet, dass sie zwischen zwei Isolierschichten (2-4, 9-10) über einen Schirm (5-8) mit hohem magnetischen Durchlässigkeitskoeffizienten verfügt, der aus mindestens einem Mu-Metallstreifen (6) besteht, der zwischen zwei Metallgeflechten (5,8) mit geringer elektrischer Leitfähigkeit und hohem Überdeckungsvermögen angeordnet ist.
  3. Montage gemäss dem Anspruch 2, dadurch gekennzeichnet, dass der Bildschirm aus zwei übereinander angeordneten, in nebeneinander liegenden Windungen gewickelten Mu-Metallstreifen (6, 7) besteht, die zwischen zwei Metallgeflechten (5, 8) angebracht sind.
  4. Montage gemäss dem Anspruch 3, dadurch gekennzeichnet, dass die Mu-Metallstreifen jeweils eine Breite von ca. 25 mm und eine Dicke von ca. 1/10tel mm aufweisen.
  5. Montage gemäss einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Metallgeflechte (5, 8) aus verzinntem Kupfer bestehen.
  6. Montage gemäss dem Anspruch 1, dadurch gekennzeichnet, dass die interne Isolierschicht (2-4) aus, von innen nach aussen nacheinander angeordnet, einer Isolierfolie (2), einer Silikon-Elastomer-Schicht (3) und einer Isolierfolie (4) besteht.
  7. Montage gemäss dem Anspruch 1, dadurch gekennzeichnet, dass die externe Schicht (9-10) aus, von innen nach aussen angeordnet, einer Isolierfolie (9) und einer Silikon-Elastomer-Schicht (10) besteht.
  8. Montage gemäss einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass sie ausserdem über einen internen, spiralenförmig angeordneten Inoxstahldraht (1) verfügt.
  9. Montage gemäss einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass sie ausserdem über eine aus einem Kunststoff bestehende Aussenverkleidung (11) zum mechanischen und chemischen Schutz verfügt.
EP19880401091 1987-05-07 1988-05-05 Anordnung bestehend aus einem abschirmantel fur ein kabel und damit verbundene verschraubung Expired - Lifetime EP0290343B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8706446A FR2615030B1 (fr) 1987-05-07 1987-05-07 Gaine souple multicouches concentriques de blindage pour cable electrique
FR8706446 1987-05-07

Publications (2)

Publication Number Publication Date
EP0290343A1 EP0290343A1 (de) 1988-11-09
EP0290343B1 true EP0290343B1 (de) 1993-02-03

Family

ID=9350870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880401091 Expired - Lifetime EP0290343B1 (de) 1987-05-07 1988-05-05 Anordnung bestehend aus einem abschirmantel fur ein kabel und damit verbundene verschraubung

Country Status (3)

Country Link
EP (1) EP0290343B1 (de)
DE (1) DE3878022T2 (de)
FR (1) FR2615030B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006013553B3 (de) * 2006-03-24 2007-10-18 Nkt Cables Gmbh Anordnung zum Umhüllen von mindestens einer Kabelader eines elektrischen Kabels
US7688036B2 (en) 2006-06-26 2010-03-30 Battelle Energy Alliance, Llc System and method for storing energy
EP2246948A2 (de) 2009-05-02 2010-11-03 nkt cables GmbH Anordnung zur Magnetfeldkompensation bei Starkstromkabeln

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2665809B1 (fr) * 1990-08-10 1994-05-13 Charles Schnitzler Dispositif d'amelioration de la qualite de signaux electriques, electro-acoustiques et/ou video.
GB9021715D0 (en) * 1990-10-05 1990-11-21 Raychem Sa Nv Electrical connector
DE19807527A1 (de) * 1998-02-21 1999-08-26 Cit Alcatel Elektrische Leitung oder elektrisches Kabel
DE19907675A1 (de) * 1999-02-23 2000-09-14 Kreitmair Steck Wolfgang Kabelschirm aus Faserverbundwerkstoffen mit hohem Anteil an elektrisch leitfähigen Fasern zur elektromagnetischen Abschirmung
FR2793594B1 (fr) * 1999-05-11 2001-12-07 Axon Cable Sa Cable passe-bas
FR2793593A1 (fr) * 1999-05-11 2000-11-17 Axon Cable Sa Cable blinde passe-bas

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB677656A (en) * 1950-03-09 1952-08-20 Avica Equip Improvements in or relating to electrostatic screening conduits for electric conductors
US3963854A (en) * 1974-12-05 1976-06-15 United Kingdom Atomic Energy Authority Shielded cables
FR2520548A1 (fr) * 1982-01-27 1983-07-29 Fileca Sa Cable electrique blinde souple

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006013553B3 (de) * 2006-03-24 2007-10-18 Nkt Cables Gmbh Anordnung zum Umhüllen von mindestens einer Kabelader eines elektrischen Kabels
US7688036B2 (en) 2006-06-26 2010-03-30 Battelle Energy Alliance, Llc System and method for storing energy
EP2246948A2 (de) 2009-05-02 2010-11-03 nkt cables GmbH Anordnung zur Magnetfeldkompensation bei Starkstromkabeln
DE102009019797A1 (de) 2009-05-02 2010-11-18 Nkt Cables Gmbh Anordnung zur Magnetfeldkompensation bei Starkstromkabeln
DE102009019797B4 (de) * 2009-05-02 2014-02-20 Nkt Cables Gmbh Anordnung zur Magnetfeldkompensation bei Starkstromkabeln

Also Published As

Publication number Publication date
EP0290343A1 (de) 1988-11-09
FR2615030B1 (fr) 1990-08-24
FR2615030A1 (fr) 1988-11-10
DE3878022D1 (de) 1993-03-18
DE3878022T2 (de) 1993-07-01

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