EP0290343B1 - Assembly of a sheath and a screw connector - Google Patents
Assembly of a sheath and a screw connector Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- assembly
- distinction
- accordance
- layer
- mumetal
- 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.)
- Expired - Lifetime
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Classifications
-
- 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.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Insulated Conductors (AREA)
Description
La présente invention concerne une assemblage d'une gaine de blindage de câble pour la protection contre le rayonnement électromagnétique, notamment dans la gamme des ondes myriamétriques et kilomètriques et d'un raccord vissé.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.
Un problème particulier à résoudre est celui du durcissement aux interférences électromagnétiques (EMI) des installations très basses fréquences (VLF) et basses fréquences (LF) de réception ou d'émission ainsi que des installations de détections acoustiques, ou de tout autre système fonctionnant dans ces gammes de fréquences.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.
On cherche aussi à atténuer le rayonnement des câbles véhiculant de l'énergie qui sont souvent des sources de parasite V L F et L F (par exemple l'harmonique de rang 170 du 60 Hertz peut perturber la réception oméga à 10,2 Khz).We also seek to attenuate the radiation of cables conveying energy which are often sources of parasite V L F and L F (for example the harmonic of rank 170 of 60 Hertz can disturb the omega reception at 10.2 Khz).
Dans une réalisation antérieure, le durcissement, c'est à dire l'insensibilité, aux interférences électromagnétiques fonctionnant à basses et très basses fréquences, consiste à blinder les câbles avec des tubes métalliques en acier dans la partie rectiligne de leur cheminement. Dans les parties coudées du câblage, on utilise un tuyau flexible en acier inoxydable austénitique.In a previous embodiment, 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.
La multiplicité d'organes de liaison spécifiques, entre ces divers produits, implique une réalisation à l'unité de pièces d'adaptation plus ou moins complexes.The multiplicity of specific connecting members, between these various products, implies the production of more or less complex adaptation pieces individually.
Si le tube acier de forte épaisseur est un blindage efficace à ces fréquences, le tuyau flexible en acier inoxydable austénique ne présente que peu d'intérêt par le fait même que la perméabilité magnétique de ces aciers inoxydables est proche de 1.If the very thick steel tube is an effective shield at these frequencies, 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.
Le document FR-A-2 520 548 décrit une gaine multicouches concentriques de blindage contenant un écran à fort coefficient de perméabilité magnétique formé par la superposition alternée de couches formées de fuseaus homogènes d'éléments conducteurs non ferromagnetiques et de couches formées d'éléments ferromagnetiques.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 .
On connaît aussi le brevet FR 2 532 463 qui décrit une gaine de protection de câble contre les perturbations électromagnétiques et la corrosion, présentant une combinaison caractéristique de couches ferromagnétiques à bas pouvoir magnétisant, comme de l'acier doux, et à haut pouvoir magnétisant, comme de l'acier au silicium, insérées dans un matériau conducteur de remplissage compris lui-même entre deux couches de plastique conducteur. Cette gaine n'est pas adaptée aux rayonnements électro-magnétiques basses fréquences.
On sait que l'efficacité de blindage dans les fréquences de 10 à 100 Khz se trouve singulièrement améliorée lorsque l'on utilise un écran à fort coefficient de perméabilité magnétique. La composante H de l'onde électromagnétique est plus active en basse fréquence qu'aux fréquences élevées.It is known that 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.
L'efficacité de blindage optimum est obtenue si l'on atténue, d'une part, le champ électrique et, d'autre part, le champ magnétique de l'onde.Optimal shielding efficiency is obtained if the electric field and the magnetic field of the wave are attenuated on the one hand.
Si l'on maitrise la technologie du blindage du champ électrique, celle du champ magnétique n'a pas suivi l'évolution issue des matières premières.If one masters the shielding technology of the electric field, that of the magnetic field has not followed the evolution from raw materials.
Le brevet FR 2 461 342 décrit toutefois un câble à haute immunité contre les rayonnements électro-magnétiques. Le câble est enrobé par un revêtement flexible qui comprend principalement un matériau magnétique composite compris entre deux blindages conducteurs flexibles. Mais ce revêtement est lié mécaniquement au câble conducteur et ne présente pas de possibilité d'élasticité radiale pour son adaptation à des câbles de dimensions même légérement différentes.
La présente invention pallie les inconvénients mentionnés ci-dessus en proposant une gaine présentant une certaine souplesse, tant axiale que radiale, permettant son adaptation à divers types et configurations de câbles, qui offre une protection efficace de ces câbles contre le rayonnement électro-magnétique dans la gamme des ondes myriamétriques et kilomètriques, et qui peut être équipée de raccords standards.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.
L'invention a donc pour objet une assemblage selon la revendication 1.The invention therefore relates to an assembly according to claim 1.
De préférence, l'écran est constitué de deux bandes de mumétal superposées enroulées en spires jointives, placées entre deux tresses de cuivre étamé.Preferably, the screen is made up of two superimposed bands of metal wound in contiguous turns, placed between two tinned copper braids.
La gaine de blindage permet de durcir une installation d'une manière homogène. Elle présente une certaine souplesse ce qui permet d'utiliser le même produit sur toute la longueur du câblage (partie droite ou courbe), et peut être équipée de raccords munis d'un contact souple à la jonction du corps de sertissage et de la partie filetée du raccord qui facilitent la mise en oeuvre du produit.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.
L'utilisation de raccords adaptés à chaque type de prise ou de presse étoupe renforce l'efficacité globale du durcissement, en améliorant l'imunité électromagnétique par la limitation des risques de fuites électromagnétiques.The use of 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.
La superposition de couches métalliques à haute perméabilité magnétique au contact de tresses métalliques assure une continuité galvanique efficace.The superimposition of metallic layers with high magnetic permeability in contact with metallic braids ensures effective galvanic continuity.
Des avantages supplémentaires apparaîtront à la lecture suivante de modes de réalisation donnés à titre exemplatif et non limitatif en référence au dessin sur lequel :
- la figure 1 est une vue en écorché de la gaine.
- la figure 2 représenté schématiquement un raccord d'assemblage.
- Figure 1 is a cutaway view of the sheath.
- Figure 2 schematically shown an assembly fitting.
La gaine des blindage est composée de couches concentriques de l'intérieur vers l'extérieur, définies comme suit, autour d'un câble électrique 20.The shielding sheath is composed of concentric layers from the inside to the outside, defined as follows, around an
La première couche 1 est un fil d'acier inoxydable de 2 mm de diamètre enroulé en hélice au pas de 10 mm. Ce fil a pour but d'assurer une tenue mécanique du produit aux efforts radiaux.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.
La deuxième couche 2 est un film isolant qui a pour fonction d'éviter le contact direct du fil d'acier inoxydable et de l'élastomère et qui peut être nécessaire au niveau de la réalisation.The
On trouve ensuite une troisième couche 3 en élastomère qui est une gomme silicone autoextinguible et ne présentant aucun dégagement de gaz halogène ni toxique.Then there is a third layer 3 of elastomer which is a self-extinguishing silicone gum and exhibiting no release of halogen or toxic gas.
La quatrième couche 4 est un film isolant très fin qui sépare la couche supérieure de cuivre de l'élastomère. Ce film facilite le dénudage de la gaine.The
L'écran à fort coefficient de perméabilité suit une cinquième couche 5 qui est une tresse en cuivre étamé à fort taux de recouvrement.The screen with a high coefficient of permeability follows a
On trouve alors deux couches 6 et 7 de mumétal d'environ 25 mm de large et un dizième de mm d'épaisseur enroulées en spires jointives, faisant par exemple un angle de 60° avec l'axe longitudinal de la gaine. La perméabilité magnétique relative du métal doit être au moins égale à 50 000.There are then two
La bande 7 de mumétal identique à la bande 6, a pour but d'assurer un recouvrement de la partie jointive de la bande précédente.The purpose of the
Le mumétal peut être remplacé par un alliage de fer-nickel-bore à structure amorphe, contenant éventuellement du phosphore comme celui connu sous la dénomination commerciale "MET GLAS", qui garde alors une grande perméabilité magnétique même après une éventuelle déformation mécanique.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.
L'écran est recouvert d'une tresse 8 en cuivre étamé à fort taux de recouvrement, elle-même recouverte d'une couche 9 identique à la couche 2, et d'une couche 10 en élastomère identique à la couche 3.The screen is covered with a
Enfin un revêtement 11 doit résister aux agressions mécanique et chimique notamment de l'environnement militaire.Finally, a
Lors de l'assemblage des gaines, des raccords à visser classiques peuvent cependant être sertis par magnétoformage. L'utilisation d'un acier inoxydable austénitique étant à proscrire, et pour assurer la continuité galvanique entre les blindages magnétiques et électriques avec les plans de masse, on utilise une matière inoxydable martinsitique ou ferritique pour allier une bonne tenue à la corrosion et une qualité de perméabilité magnétique.When assembling the ducts, conventional screw fittings can however be crimped by magnetoforming. The use of an austenitic stainless steel being to be prohibited, and to ensure the galvanic continuity between the magnetic and electrical shields with the ground planes, one uses a martinsitic or ferritic stainless material to combine a good resistance to corrosion and a quality magnetic permeability.
La figure 2 montre un raccod 21 spécifique adapté à la gaine selon l'invention, comprenant une zone de sertissage 22 séparée d'une bague filetée 23, par un contact souple 24 constitué par exemple en bronze phosphoreux ou en cuivre, pour assurer la continuité galvanique entre la zone de sertissage 22 et la bague 23. Un jonc 25 en acier assure le maintien mécanique des parties 22 et 23. Enfin, la bague filetée permet le raccordement mécanique sur un étoupe 26 de câble.FIG. 2 shows a
Claims (9)
- The assembly of concentric multi-layer screens for the shielding of electric cables (20), in particular for protection against low-frequency electrical radiation, with the distinction that the screens include, between two insulating layers (2-4 and 9-10), a high-magnetic-permeability screen (5-8) composed of at least two tapes of iron-nickel alloy of crystalline structure or iron-nickel-borium alloy of amorphous structure, placed between two metal braids (5, 8) with low electrical resistance and a closely-woven structure. This assembly uses screwed connectors made of martinsitic or ferritic stainless material, additionally crimped by magneto-forming, and fitted with a flexible electrical contact (24) at the junction of the crimping zone and the threaded part of the connector.
- Assembly in accordance with claim 1, with the distinction that it includes, between two insulating layers (2-4 and 9-10), a high-magnetic-permeability screen (5-8) composed of at least one tape of mumetal (6) placed between two metal braids (5, 8) with low electrical resistance and a closely-woven structure.
- Assembly in accordance with claim 2, with the distinction that the screen is composed of two tapes (6, 7) of superimposed mumetal wound in adjacent turns and placed between two metal braids (5, 8).
- Assembly in accordance with claim 3, with the distinction that each of the mumetal tapes are approximately 25 mm in width and about one tenth of a millimetre in thickness.
- Assembly in accordance with one of the claims numbered 1 to 4, with the distinction that the metal braids (5, 8) are in tinned copper.
- Assembly in accordance with claim 1, with the distinction that the internal insulating layer (2-4) is composed, from inside to outside, of an insulating film (2), a layer of silicone elastomer (3), and a further insulating film (4).
- Assembly in accordance with claim 1, with the distinction that the external layer (9-10) is composed, from inside to outside, of an insulating film (9), a layer of silicone elastomer (10).
- Assembly in accordance with one of the claims numbered 1 to 7, with the distinction that it also includes an internal stainless steel wire (1) wound as a helix.
- Assembly in accordance with one of the claims numbered 1 to 8, with the distinction that it also includes an external covering (11) for mechanical and chemical protection, composed of a plastic material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8706446 | 1987-05-07 | ||
| FR8706446A FR2615030B1 (en) | 1987-05-07 | 1987-05-07 | CONCENTRIC MULTI-LAYER SHEATH OF CONCENTRIC SHIELDING FOR ELECTRICAL CABLE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0290343A1 EP0290343A1 (en) | 1988-11-09 |
| EP0290343B1 true EP0290343B1 (en) | 1993-02-03 |
Family
ID=9350870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19880401091 Expired - Lifetime EP0290343B1 (en) | 1987-05-07 | 1988-05-05 | Assembly of a sheath and a screw connector |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0290343B1 (en) |
| DE (1) | DE3878022T2 (en) |
| FR (1) | FR2615030B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006013553B3 (en) * | 2006-03-24 | 2007-10-18 | Nkt Cables Gmbh | Arrangement for enveloping at least one cable core of an electrical cable |
| US7688036B2 (en) | 2006-06-26 | 2010-03-30 | Battelle Energy Alliance, Llc | System and method for storing energy |
| EP2246948A2 (en) | 2009-05-02 | 2010-11-03 | nkt cables GmbH | Assembly for compensating for magnetic fields in high power cables |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2665809B1 (en) * | 1990-08-10 | 1994-05-13 | Charles Schnitzler | DEVICE FOR IMPROVING THE QUALITY OF ELECTRIC, ELECTRO-ACOUSTIC AND / OR VIDEO SIGNALS. |
| GB9021715D0 (en) * | 1990-10-05 | 1990-11-21 | Raychem Sa Nv | Electrical connector |
| DE19807527A1 (en) * | 1998-02-21 | 1999-08-26 | Cit Alcatel | Electric wire or cable |
| DE19907675A1 (en) * | 1999-02-23 | 2000-09-14 | Kreitmair Steck Wolfgang | Cable shield made of fiber composite materials with a high proportion of electrically conductive fibers for electromagnetic shielding |
| FR2793594B1 (en) * | 1999-05-11 | 2001-12-07 | Axon Cable Sa | LOW PASS CABLE |
| FR2793593A1 (en) * | 1999-05-11 | 2000-11-17 | Axon Cable Sa | Multi-layer coaxial cable for low-pass use includes magnetic screening layer between two dielectric layers |
Family Cites Families (3)
| 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 (en) * | 1982-01-27 | 1983-07-29 | Fileca Sa | Flexible shielded electric cable for low and medium frequency - uses alternate layers of conducting and ferromagnetic braid to give adequate shielding with conductor thickness less than skin depth |
-
1987
- 1987-05-07 FR FR8706446A patent/FR2615030B1/en not_active Expired - Lifetime
-
1988
- 1988-05-05 DE DE19883878022 patent/DE3878022T2/en not_active Expired - Fee Related
- 1988-05-05 EP EP19880401091 patent/EP0290343B1/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006013553B3 (en) * | 2006-03-24 | 2007-10-18 | Nkt Cables Gmbh | Arrangement for enveloping at least one cable core of an electrical cable |
| US7688036B2 (en) | 2006-06-26 | 2010-03-30 | Battelle Energy Alliance, Llc | System and method for storing energy |
| EP2246948A2 (en) | 2009-05-02 | 2010-11-03 | nkt cables GmbH | Assembly for compensating for magnetic fields in high power cables |
| DE102009019797A1 (en) | 2009-05-02 | 2010-11-18 | Nkt Cables Gmbh | Arrangement for magnetic field compensation in power cables |
| DE102009019797B4 (en) * | 2009-05-02 | 2014-02-20 | Nkt Cables Gmbh | Arrangement for magnetic field compensation in power cables |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2615030B1 (en) | 1990-08-24 |
| EP0290343A1 (en) | 1988-11-09 |
| DE3878022T2 (en) | 1993-07-01 |
| DE3878022D1 (en) | 1993-03-18 |
| FR2615030A1 (en) | 1988-11-10 |
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