EP0485920A1 - Electrical cable with high propagation velocity - Google Patents
Electrical cable with high propagation velocity Download PDFInfo
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- EP0485920A1 EP0485920A1 EP91119172A EP91119172A EP0485920A1 EP 0485920 A1 EP0485920 A1 EP 0485920A1 EP 91119172 A EP91119172 A EP 91119172A EP 91119172 A EP91119172 A EP 91119172A EP 0485920 A1 EP0485920 A1 EP 0485920A1
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- Prior art keywords
- conductors
- rod
- rods
- conductor
- insulating
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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
- H01B11/002—Pair constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0233—Cables with a predominant gas dielectric
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0241—Disposition of insulation comprising one or more helical wrapped layers of insulation
Definitions
- the invention relates to an electrical cable with high propagation speed, such as those used for transmitting data from one computer machine to another.
- To produce a cable having a high propagation speed it is known to reduce the linear capacity existing between two conductors of this cable, by increasing the distance between these conductors and the distance between these conductors and the screen; and by reducing the average value of the permittivity of the dielectrics located between these two conductors along the cable.
- This cable is bulky because the insulating core has a diameter much greater than the diameter of each of the 4 conductors. It maintains a predetermined distance between the conductors, so as to reduce the linear capacity between the conductors.
- the core and the first insulating layer may be made of polytetrafluoroethylene expanded.
- the object of the invention is to provide a cable having a high propagation speed, without having the disadvantages of cables of known types.
- the object of the invention is an electric cable with a high propagation speed comprising a plurality of conductors and means for maintaining a predetermined distance between said conductors; characterized in that two insulating rods enclosing two neighboring conductors rotate in the same direction and have the same constant pitch, and are nested, the rod enclosing a conductor also bears against the other conductor.
- the object of the invention is also a cable characterized in that two insulating rods enclosing two neighboring conductors rotate in opposite directions and have different pitches, not multiple from one another, so as never to be nest.
- the turns of rod 1 and rod 4 respectively enclose conductors 2 and 3.
- Each of rods 3 and 4 is made from a straight cylindrical rod with circular section which is wound around one of conductors 2 or 3.
- Each rod 1 and 4 therefore encloses one of the conductors in these turns.
- the two rods 1 and 4 are wound with the same pitch which is constant and which is much greater than the diameter of the section of each rod, so that the free volume between the turns is much greater than the volume occupied by the turns.
- the conductors 2 and 3, enclosed in the rods 1 and 4 are brought together by nesting the turns of the rods, so that the rod 1 enclosing the conductor 2 is also in abutment against the conductor 3.
- the rod 4 enclosing the conductor 3 is also in abutment against the conductor 2.
- FIG. 2 represents a section of this exemplary embodiment, in the direction of view II II. This section shows that the two conductors, 2 and 3, are kept at a predetermined distance by the diameter of the section of the rod 1 and the rod 4. The geometric envelope of these turns is shown in dotted lines. The distance between the axes of conductors 2 and 3 is substantially equal to the sum of the diameter of a conductor and the diameter of the section of each of the rods 1 and 4.
- the diameter of the rods can be chosen so as to separate the conductors, to reduce the linear capacity. But, above all, this type of cable makes it possible to reduce the linear capacity by reducing the average permittivity.
- the turns of the rods 1 and 4 occupy only a small portion of the volume located between the two conductors 2 and 3, the rest being filled with air because the insulating material constituting the envelope 5 does not penetrate into the space located between the turns. Consequently, the average permittivity of this volume is lower than that of the polyethylene constituting the two rods.
- the average permittivity obtained is 1 , 2 while that of solid polyethylene is 2.28.
- the characteristic impedance is 150 ohms for frequencies above 1 MHz.
- the cable according to the invention can have a smaller footprint than a cable of known type, at equal speed, with equal attenuation, and with equal impedance.
- This exemplary embodiment can be coated with an electrical screen of a conventional type, and it can be twisted like a conventional pair.
- Alternative embodiments may consist in replacing the sheath 5 of extruded polyethylene by an insulating tape wound in a helix. It is possible to prevent the effect of the humidity of the air contained in the cavities between the turns of rods 1 and 4, by depositing in these cavities a small amount of a powder which swells while absorbing moisture, and which is conventionally used to protect, from humidity, the interior of coaxial cables comprising a solid dielectric having a helical shape.
- the two embodiments described above only have one pair of conductors, but the scope of the invention is not limited to this type of cable.
- To make a cable with four conductors it is within the reach of ordinary skill in the art to nest four conductors each provided with a rod of helical shape, the axes of the four conductors being preferably placed in a square. It is also possible to produce a multiconductor cable by placing conductors, each provided with a helical rod, so that the axes of the conductors are in the same plane.
- this cable is similar to those of the cable described with reference to Figure 1, but the two rods do not rotate in the same direction and have different pitches. In addition, the steps are different from a multiple of each other, so that the two rods cannot overlap.
- a turn of the rod 1 '' and a turn of the rod 4 '' are in contact at a point 6, while the neighboring turns are not in contact because of the difference in pitch .
- the turns in contact are numerous enough to separate the two rods, and therefore the two conductors.
- Figure 5 shows a sectional view of this third embodiment, in the direction of view VV.
- the rods 1 '' and 4 '' each having a cross section which is circular, the width of the space which separates the conductors 2 '' and 3 '' is substantially equal to twice the diameter of this cross section. If we compare the linear capacity between the conductors of the third embodiment, and the linear capacity of the conductors of the first embodiment, the capacity is divided by 2, for identical conductors and rods having an identical diameter of their cross section.
- the rod 22 is wound in the opposite direction to the direction of stranding of the conductors 21. Its function is to separate the conductors 21 from the screen 23 without the permittivity of the space between the conductors 21 and the screen 23 being very different that of air, unlike conventional solutions consisting in using polyester, polyethylene or polypropylene insulating tapes, solid or expanded.
- Each conductor 21 can be isolated individually by a continuous sheath, made of polyethylene for example, but it can also be isolated by a rod of helical shape similar to those described above with reference to FIG. 1 and to FIG. 4. Many variants are within the reach of ordinary skill in the art, such as for example the use of a screen placed lengthwise, instead of a screen placed helically.
- Figure 7 shows a sectional view of the third embodiment, in the direction of view VII VII. It shows that the rod 22 separates all of the conductors 21 of the screen 23 by a space whose width is substantially equal to the diameter of the cross section of the rod 22. As shown in these figures, the proportion of insulating material present between the conductors 21 and the screen 23 is low, therefore the average permittivity of this space remains close to that of air.
- the cable By appropriately choosing the characteristics of the rod, or rods, it is possible to give the cable an average density of less than 1 so that the cable can float.
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Abstract
Un exemple de réalisation comporte : deux conducteurs nus parallèles (2, 3) en bronze; deux joncs isolants (1, 4) ayant une forme hélicoïdale à spires non jointives; les deux joncs étant imbriqués de telle sorte qu'ils maintiennent une distance prédéterminée entre les deux conducteurs (2, 3); une gaine de protection (5) isolante; Le pas de la forme hélicoïdale des joncs étant très supérieur au diamètre de leur section, le volume séparant les deux conducteurs (2, 3) est rempli majoritairement par de l'air, ce qui procure une permittivité réduite et donc une vitesse de propagation élevée. Application aux câbles de transmission de données pour machines informatiques. <IMAGE>An exemplary embodiment comprises: two parallel bare conductors (2, 3) in bronze; two insulating rods (1, 4) having a helical shape with non-contiguous turns; the two rods being nested so that they maintain a predetermined distance between the two conductors (2, 3); an insulating protective sheath (5); The pitch of the helical shape of the rods being much greater than the diameter of their section, the volume separating the two conductors (2, 3) is mainly filled with air, which provides a reduced permittivity and therefore a high propagation speed. . Application to data transmission cables for computer machines. <IMAGE>
Description
L'invention concerne un câble électrique à vitesse de propagation élevée, tels que ceux utilisés pour transmettre des données d'une machine informatique à une autre. Pour réaliser un câble ayant une vitesse de propagation élevée, il est connu de réduire la capacité linéique existant entre deux conducteurs de ce câble, en augmentant la distance entre ces conducteurs et la distance entre ces conducteurs et l'écran; et en réduisant la valeur moyenne de la permittivité des diélectriques situés entre ces deux conducteurs tout au long du câble.The invention relates to an electrical cable with high propagation speed, such as those used for transmitting data from one computer machine to another. To produce a cable having a high propagation speed, it is known to reduce the linear capacity existing between two conductors of this cable, by increasing the distance between these conductors and the distance between these conductors and the screen; and by reducing the average value of the permittivity of the dielectrics located between these two conductors along the cable.
Il est connu de réduire la valeur moyenne de la permittivité du diélectrique séparant deux conducteurs d'un câble, en utilisant une matière plastique expansée. Par exemple, le polyéthylène a une permittivité de 2,28 lorsqu'il est massif et une permittivité réduite à 1,6 ou 1,5 lorsqu'il est expansé. Cependant les matériaux diélectriques expansés ont pour inconvénient une faible résistance mécanique qui provoque un déplacement relatif des conducteurs lorsque le câble est soumis à une flexion ou à une torsion. Ce déplacement provoque localement une altération des caractéristiques électriques du câble.It is known to reduce the average value of the permittivity of the dielectric separating two conductors of a cable, by using an expanded plastic material. For example, polyethylene has a permittivity of 2.28 when it is solid and a permittivity reduced to 1.6 or 1.5 when it is expanded. However, expanded dielectric materials have the disadvantage of a low mechanical resistance which causes relative displacement of the conductors when the cable is subjected to bending or twisting. This displacement locally causes an alteration of the electrical characteristics of the cable.
Par exemple, la demande de brevet européen n° 296 692 décrit un câble pour la transmission de données, comportant :
- une âme isolante ayant une forme cylindrique et creusée de 4 sillons longitudinaux régulièrement répartis et spiralés;
- 4 conducteurs nus placés dans ces sillons;
- une première couche isolante entourant l'ensemble des conducteurs et de l'âme;
- un écran métallique entourant la couche isolante;
- et une seconde couche périphérique isolante protègeant mécaniquement l'ensemble du câble.
- an insulating core having a cylindrical shape and hollowed out by 4 longitudinal grooves regularly distributed and spiraled;
- 4 bare conductors placed in these furrows;
- a first insulating layer surrounding all of the conductors and of the core;
- a metal screen surrounding the insulating layer;
- and a second insulating peripheral layer mechanically protecting the entire cable.
Ce câble est encombrant car l'âme isolante a un diamètre très supérieur au diamètre de chacun des 4 conducteurs. Elle maintient une distance prédéterminée entre les conducteurs, de façon à réduire la capacité linéique entre les conducteurs. L'âme et la première couche isolante peuvent être en polytétrafluoréthylène expansé.This cable is bulky because the insulating core has a diameter much greater than the diameter of each of the 4 conductors. It maintains a predetermined distance between the conductors, so as to reduce the linear capacity between the conductors. The core and the first insulating layer may be made of polytetrafluoroethylene expanded.
Le but de l'invention est de proposer un câble présentant une vitesse de propagation élevée, sans avoir les inconvénients des câbles de types connus.The object of the invention is to provide a cable having a high propagation speed, without having the disadvantages of cables of known types.
L'objet de l'invention est un câble électrique à vitesse de propagation élevée comportant une pluralité de conducteurs et des moyens pour maintenir une distance prédéterminée entre les dits conducteurs; caractérisé en ce que deux joncs isolants enserrant deux conducteurs voisins tournent dans le même sens et ont un même pas constant, et sont imbriqués, le jonc enserrant un conducteur étant en appui aussi contre l'autre conducteur.The object of the invention is an electric cable with a high propagation speed comprising a plurality of conductors and means for maintaining a predetermined distance between said conductors; characterized in that two insulating rods enclosing two neighboring conductors rotate in the same direction and have the same constant pitch, and are nested, the rod enclosing a conductor also bears against the other conductor.
L'objet de l'invention est en outre un câble caractérisé en ce que deux joncs isolants enserrant deux conducteurs voisins tournent en sens inverse et ont des pas différents, non multiples l'un de l'autre, de manière à ne jamais s'imbriquer.The object of the invention is also a cable characterized in that two insulating rods enclosing two neighboring conductors rotate in opposite directions and have different pitches, not multiple from one another, so as never to be nest.
L'invention sera mieux comprise et d'autres détails apparaîtront à l'aide de la description ci-dessous et des figures l'accompagnant :
- la figure 1 montre un premier exemple de réalisation d'un câble selon l'invention;
- la figure 2 montre une section de ce premier exemple de réalisation;
- la figure 3 montre une section d'un second exemple de réalisation, qui est une variante du premier exemple;
- la figure 4 représente un deuxième exemple de réalisation du câble selon l'invention;
- la figure 5 représente une vue en coupe de ce deuxième exemple de réalisation;
- la figure 6 représente un troisième exemple de réalisation du câble selon l'invention;
- la figure 7 représente une vue en coupe de ce troisième exemple de réalisation.
- Figure 1 shows a first embodiment of a cable according to the invention;
- Figure 2 shows a section of this first embodiment;
- Figure 3 shows a section of a second embodiment, which is a variant of the first example;
- Figure 4 shows a second embodiment of the cable according to the invention;
- Figure 5 shows a sectional view of this second embodiment;
- FIG. 6 represents a third embodiment of the cable according to the invention;
- Figure 7 shows a sectional view of this third embodiment.
Le premier exemple de réalisation, représenté sur la figure 1, comporte :
- deux conducteurs nus parallèles, 2 et 3, en cuivre ou alliage conducteur, ayant une forme cylindrique, et de même diamètre;
- deux joncs, 1 et 4, en polyéthylène extrudé, ayant chacun une forme hélicoïdale à spires non jointives, et tournant dans le même sens;
- une gaine isolante et protectrice 5, en polyéthylène extrudé, recouvrant l'ensemble du câble, en ayant une épaisseur constante.
- two parallel bare conductors, 2 and 3, of copper or conductive alloy, having a cylindrical shape, and of the same diameter;
- two rods, 1 and 4, in extruded polyethylene, each having a helical shape with non-contiguous turns, and rotating in the same direction;
- an insulating and
protective sheath 5, made of extruded polyethylene, covering the entire cable, having a constant thickness.
Les spires du jonc 1 et du jonc 4 enserrent respectivement les conducteurs 2 et 3. Chacun des joncs 3 et 4 est fabriqué à partir d'un jonc droit cylindrique à section circulaire qui est enroulé autour de l'un des conducteurs 2 ou 3. Chaque jonc 1 et 4 enserre donc l'un des conducteurs dans ces spires. Les deux joncs 1 et 4 sont enroulés avec un même pas qui est constant et qui est très supérieur au diamètre de la section de chaque jonc, de telle sorte que le volume libre entre les spires est très supérieur au volume occupé par les spires. Puis les conducteurs 2 et 3, enserrés dans les joncs 1 et 4, sont rapprochés en imbriquant les spires des joncs, de telle sorte que le jonc 1 enserrant le conducteur 2 est aussi en appui contre le conducteur 3. De même, le jonc 4 enserrant le conducteur 3 est aussi en appui contre le conducteur 2.The turns of
La figure 2 représente une section de cet exemple de réalisation, selon la direction de vue II II. Cette section montre que les deux conducteurs, 2 et 3, sont maintenus à une distance prédéterminée par le diamètre de la section du jonc 1 et du jonc 4. L'enveloppe géométrique de ces spires est représentée en pointillés. La distance entre les axes des conducteurs 2 et 3 est sensiblement égale à la somme du diamètre d'un conducteur et du diamètre de la section de chacun des joncs 1 et 4.FIG. 2 represents a section of this exemplary embodiment, in the direction of view II II. This section shows that the two conductors, 2 and 3, are kept at a predetermined distance by the diameter of the section of the
Le diamètre des joncs peut être choisi de façon à écarter les conducteurs, pour réduire la capacité linéique. Mais, surtout, ce type de câble permet de réduire la capacité linéique en réduisant la permittivité moyenne. Les spires des joncs 1 et 4 n'occupent qu'une faible portion du volume situé entre les deux conducteurs 2 et 3, le reste étant rempli d'air car la matière isolante constituant l'enveloppe 5 ne pénètre pas dans l'espace situé entre les spires. Par conséquent, la permittivité moyenne de ce volume est inférieure à celle du polyéthylène constituant les deux joncs.The diameter of the rods can be chosen so as to separate the conductors, to reduce the linear capacity. But, above all, this type of cable makes it possible to reduce the linear capacity by reducing the average permittivity. The turns of the
Dans un exemple où le diamètre des conducteurs est de 0,65mm, le diamètre des joncs de 0,9mm, et le pas de 13,2mm, avec une couche périphérique 5 ayant une épaisseur nominale de 3mm, la permittivité moyenne obtenue est de 1,2 alors que celle du polyéthylène massif est de 2,28. L'impédance caractéristique est de 150 ohms pour des fréquences supérieures à 1 MHz. Réciproquement, le câble selon l'invention peut avoir un encombrement plus réduit qu'un câble de type connu, à vitesse égale, à atténuation égale, et à impédance égale.In an example where the diameter of the conductors is 0.65mm, the diameter of the rods of 0.9mm, and the pitch of 13.2mm, with a
Cette exemple de réalisation peut être revêtu d'un écran électrique d'un type classique, et il peut être torsadé comme une paire classique.This exemplary embodiment can be coated with an electrical screen of a conventional type, and it can be twisted like a conventional pair.
Des variantes de réalisation peuvent consister à remplacer la gaine 5 de polyéthylène extrudé par un ruban isolant enroulé en hélice. Il est possible de prévenir l'effet de l'humidité de l'air contenu dans les cavités entre les spires des joncs 1 et 4, en déposant dans ces cavités une petite quantité d'une poudre qui gonfle en absorbant l'humidité, et qui est utilisée classiquement pour protéger, de l'humidité, l'intérieur des câbles coaxiaux comportant un diélectrique solide ayant une forme hélicoïdale.Alternative embodiments may consist in replacing the
La figure 3 représente une section d'un second exemple de réalisation d'un câble selon l'invention, comportant :
- deux conducteurs 11
et 13 protégés, de l'humidité, respectivement par deux couches isolantes, 10et 12, en polyéthylène extrudé, ayant une faible épaisseur par rapport au diamètre de la section d'un jonc; - deux joncs 1' et 4' analogues aux joncs 1 et 4 décrits précédemment mais qui sont enroulés autour des
couches 10 et 12 respectivement, au lieu d'être en contact direct avec les conducteurs 11et 13; - une gaine isolante 5', analogue à la gaine 5, enveloppant l'ensemble du câble.
- two
11 and 13 protected from moisture, respectively by two insulating layers, 10 and 12, made of extruded polyethylene, having a small thickness compared to the diameter of the section of a rod;conductors - two rods 1 'and 4' similar to
rods 1 and 4 described above but which are wound around the 10 and 12 respectively, instead of being in direct contact with thelayers 11 and 13;conductors - an insulating sheath 5 ', similar to the
sheath 5, enveloping the entire cable.
Les deux exemples de réalisation décrits précédemment ne comportent qu'une paire de conducteurs, mais la portée de l'invention n'est pas limitée à ce type de câble. Pour réaliser un câble à quatre conducteurs, il est à la portée de l'homme de l'art d'imbriquer quatre conducteurs munis chacun d'un jonc de forme hélicoïdale, les axes des quatre conducteurs étant placés préférentiellement en carré. Il est possible aussi de réaliser un câble multiconducteurs en plaçant des conducteurs, munis chacun d'un jonc de forme hélicoïdale, de telle sorte que les axes des conducteurs soient dans un même plan.The two embodiments described above only have one pair of conductors, but the scope of the invention is not limited to this type of cable. To make a cable with four conductors, it is within the reach of ordinary skill in the art to nest four conductors each provided with a rod of helical shape, the axes of the four conductors being preferably placed in a square. It is also possible to produce a multiconductor cable by placing conductors, each provided with a helical rod, so that the axes of the conductors are in the same plane.
La figure 4 représente un deuxième exemple de réalisation du câble selon l'invention, qui comporte :
- deux conducteurs nus parallèles, 2'' et 3'';
- deux joncs 1'' et 4'', ayant chacun une forme hélicoïdale à spires non jointives;
- une gaine isolante et protectrice 5'', recouvrant l'ensemble du câble en ayant une épaisseur constante.
- two parallel bare conductors, 2 '' and 3 '';
- two rods 1 '' and 4 '', each having a helical shape with non-contiguous turns;
- an insulating and protective sheath 5 '', covering the entire cable with a constant thickness.
Les éléments constitutifs de ce câble sont analogues à ceux du câble décrit en référence à la figure 1, mais les deux joncs ne tournent pas dans le même sens et ont des pas différents. En outre, les pas sont différents d'un multiple l'un de l'autre, de telle sorte que les deux joncs ne peuvent s'imbriquer. Dans l'exemple représenté sur la figure 4, une spire du jonc 1'' et une spire du jonc 4'' sont en contact en un point 6, alors que les spires voisines ne sont pas en contact à cause de la différence de pas. Les spires en contact sont suffisamment nombreuses pour écarter les deux joncs, et par conséquent les deux conducteurs.The components of this cable are similar to those of the cable described with reference to Figure 1, but the two rods do not rotate in the same direction and have different pitches. In addition, the steps are different from a multiple of each other, so that the two rods cannot overlap. In the example shown in Figure 4, a turn of the rod 1 '' and a turn of the rod 4 '' are in contact at a
La figure 5 montre une vue en coupe de ce troisième exemple de réalisation, selon la direction de vue VV. Les joncs 1'' et 4'' ayant chacun une section droite qui est circulaire, la largeur de l'espace qui sépare les conducteurs 2'' et 3'' est sensiblement égale à deux fois le diamètre de cette section droite. Si on compare la capacité linéique entre les conducteurs du troisième exemple de réalisation, et la capacité linéïque des conducteurs du premier exemple de réalisation, la capacité est divisée par 2, pour des conducteurs identiques et des joncs ayant un diamètre identique de leur section droite.Figure 5 shows a sectional view of this third embodiment, in the direction of view VV. The rods 1 '' and 4 '' each having a cross section which is circular, the width of the space which separates the conductors 2 '' and 3 '' is substantially equal to twice the diameter of this cross section. If we compare the linear capacity between the conductors of the third embodiment, and the linear capacity of the conductors of the first embodiment, the capacity is divided by 2, for identical conductors and rods having an identical diameter of their cross section.
La figure 6 représente un troisième exemple de réalisation du câble selon l'invention, qui comporte :
- une pluralité de conducteurs 21 isolés individuellement et toronnés;
un jonc isolant 22 de forme hélicoïdale et ayant une section droite qui est circulaire;un écran électrique 23, constitué par exemple d'un ruban métallique enroulé en hélice;- et une gaine isolante 24 recouvrant et protégeant l'ensemble du câble.
- a plurality of
conductors 21 individually insulated and stranded; - an insulating
rod 22 of helical shape and having a cross section which is circular; - an
electric screen 23, consisting for example of a metallic ribbon wound in a helix; - and an insulating
sheath 24 covering and protecting the entire cable.
Le jonc 22 est enroulé en sens opposé au sens de toronnage des conducteurs 21. Il a pour fonction de séparer les conducteurs 21 de l'écran 23 sans que la permittivité de l'espace entre les conducteurs 21 et l'écran 23 soit très différente de celle de l'air, contrairement aux solutions classiques consistant à utiliser des rubans isolants en polyester, polyéthylène, ou polypropylène, massifs ou expansés.The
Chaque conducteur 21 peut être isolé individuellement par une gaine continue, en polyéthylène par exemple, mais il peut aussi être isolés par un jonc de forme hélicoïdale analogue à ceux décrits précédemment en référence à la figure 1 et à la figure 4. De nombreuses variantes sont à la portée de l'homme de l'art, telles que par exemple l'utilisation d'un écran posé en long, au lieu d'un écran posé en hélice.Each
La figure 7 représente une vue en coupe du troisième exemple de réalisation, selon la direction de vue VII VII. Elle montre que le jonc 22 sépare l'ensemble des conducteurs 21 de l'écran 23 par un espace dont la largeur est sensiblement égale au diamètre de la section droite du jonc 22. Comme le montre ces figures, la proportion de matière isolante présente entre les conducteurs 21 et l'écran 23 est faible, par conséquent la permittivité moyenne de cet espace reste proche de celle de l'air.Figure 7 shows a sectional view of the third embodiment, in the direction of view VII VII. It shows that the
En choisissant convenablement les caractéristiques du jonc, ou des joncs, il est possible de donner au câble une densité moyenne inférieure à 1 pour que le câble puisse flotter.By appropriately choosing the characteristics of the rod, or rods, it is possible to give the cable an average density of less than 1 so that the cable can float.
Claims (6)
lesdits moyens comportant, autour d'au moins un conducteur (2, 3), un jonc isolant (1, 4) ayant une forme hélicoïdale à spires non jointives, dont l'axe longitudinal est confondu avec celui dudit conducteur, chaque spire enserrant ledit conducteur;
caractérisé en ce que deux joncs isolants (1, 4) enserrant deux conducteurs voisins (2, 3) tournent dans le même sens et ont un même pas constant, et sont imbriqués, le jonc (1) enserrant un conducteur (2) étant en appui aussi contre l'autre conducteur (3).High propagation speed electric cable, comprising a plurality of conductors and means for maintaining a predetermined distance between said conductors;
said means comprising, around at least one conductor (2, 3), an insulating rod (1, 4) having a helical shape with non-contiguous turns, the longitudinal axis of which coincides with that of said conductor, each turn enclosing said driver;
characterized in that two insulating rods (1, 4) enclosing two neighboring conductors (2, 3) rotate in the same direction and have the same constant pitch, and are nested, the rod (1) enclosing a conductor (2) being in also press against the other conductor (3).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9014171A FR2669143B1 (en) | 1990-11-14 | 1990-11-14 | HIGH SPREAD SPEED ELECTRIC CABLE. |
FR9014171 | 1990-11-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0485920A1 true EP0485920A1 (en) | 1992-05-20 |
EP0485920B1 EP0485920B1 (en) | 1995-08-02 |
Family
ID=9402191
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91119172A Expired - Lifetime EP0485920B1 (en) | 1990-11-14 | 1991-11-11 | Electrical cable with high propagation velocity |
Country Status (4)
Country | Link |
---|---|
US (1) | US5286923A (en) |
EP (1) | EP0485920B1 (en) |
DE (1) | DE69111750T2 (en) |
FR (1) | FR2669143B1 (en) |
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WO1998028756A1 (en) * | 1996-12-23 | 1998-07-02 | Marco Verdi | Cables for high-fidelity audio systems |
EP0999557A1 (en) * | 1998-11-05 | 2000-05-10 | Sagem Sa | Pair or quad high frequency transmission cable |
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US7214884B2 (en) * | 2003-10-31 | 2007-05-08 | Adc Incorporated | Cable with offset filler |
US7115815B2 (en) * | 2003-10-31 | 2006-10-03 | Adc Telecommunications, Inc. | Cable utilizing varying lay length mechanisms to minimize alien crosstalk |
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US7271344B1 (en) * | 2006-03-09 | 2007-09-18 | Adc Telecommunications, Inc. | Multi-pair cable with channeled jackets |
US7375284B2 (en) * | 2006-06-21 | 2008-05-20 | Adc Telecommunications, Inc. | Multi-pair cable with varying lay length |
US7411131B2 (en) * | 2006-06-22 | 2008-08-12 | Adc Telecommunications, Inc. | Twisted pairs cable with shielding arrangement |
US7525041B2 (en) * | 2006-09-21 | 2009-04-28 | General Electric Company | Method and apparatus for resonance frequency response attenuation |
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US9418775B2 (en) | 2008-03-19 | 2016-08-16 | Commscope, Inc. Of North Carolina | Separator tape for twisted pair in LAN cable |
US9978480B2 (en) | 2008-03-19 | 2018-05-22 | Commscope, Inc. Of North Carolina | Separator tape for twisted pair in LAN cable |
CA2724528C (en) | 2008-07-03 | 2017-03-28 | Adc Telecommunications, Inc. | Telecommunications wire having a channeled dielectric insulator and methods for manufacturing the same |
US8344255B2 (en) * | 2009-01-16 | 2013-01-01 | Adc Telecommunications, Inc. | Cable with jacket including a spacer |
US9355755B2 (en) | 2011-04-07 | 2016-05-31 | 3M Innovative Properties Company | High speed transmission cable |
CN203596185U (en) | 2011-04-07 | 2014-05-14 | 3M创新有限公司 | High-speed transmission cable |
US20140060882A1 (en) * | 2012-08-31 | 2014-03-06 | Tyco Electronics Corporation | Communication cable having at least one insulated conductor |
FR3011670A1 (en) * | 2013-10-09 | 2015-04-10 | Labinal | ELECTRIC HARNESS WITH LOW LINEAR CAPACITY |
US9293239B2 (en) * | 2013-12-24 | 2016-03-22 | Belden Inc. | Semi-solid balanced audio cable |
US9748022B2 (en) | 2013-12-24 | 2017-08-29 | Belden Inc. | Semi-solid balanced audio cable |
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WO2019208401A1 (en) * | 2018-04-25 | 2019-10-31 | ダイキン工業株式会社 | Stranded wire and method of manufacture therefor |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE599312C (en) * | 1930-11-06 | 1934-07-30 | Siemens Schuckertwerke Akt Ges | Process for the production of air-insulated twin cores for telecommunication cables |
FR810882A (en) * | 1935-08-12 | 1937-04-01 | Lignes Telegraph Telephon | Air insulated high frequency conductor |
US2348752A (en) * | 1940-09-17 | 1944-05-16 | Int Standard Electric Corp | Electric cable |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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NL48345C (en) * | 1934-07-17 | |||
US2118907A (en) * | 1935-07-02 | 1938-05-31 | Felten & Guilleaume Carlswerk | Multicore high frequency conductor |
FR815143A (en) * | 1935-12-18 | 1937-07-06 | Lignes Telegraph Telephon | Insulating cord |
GB570349A (en) * | 1943-10-27 | 1945-07-03 | Communications Patents Ltd | Improved coaxial electric cable and systems comprising such cable |
US2614172A (en) * | 1948-06-12 | 1952-10-14 | Anaconda Wire & Cable Co | High impedance shielded twin conductor cable |
DE2104600C3 (en) * | 1971-02-01 | 1973-09-13 | Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften E.V., 3400 Goettingen | Electrical conductor for superconducting windings or switching sections, and method for producing such a conductor |
DE3216233A1 (en) * | 1982-04-30 | 1983-11-03 | Siemens AG, 1000 Berlin und 8000 München | LIGHTWAVE LEAD CABLE WITH A LAYER COVER |
US4767890A (en) * | 1986-11-17 | 1988-08-30 | Magnan David L | High fidelity audio cable |
-
1990
- 1990-11-14 FR FR9014171A patent/FR2669143B1/en not_active Expired - Fee Related
-
1991
- 1991-11-11 DE DE69111750T patent/DE69111750T2/en not_active Expired - Fee Related
- 1991-11-11 EP EP91119172A patent/EP0485920B1/en not_active Expired - Lifetime
- 1991-11-13 US US07/791,234 patent/US5286923A/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE599312C (en) * | 1930-11-06 | 1934-07-30 | Siemens Schuckertwerke Akt Ges | Process for the production of air-insulated twin cores for telecommunication cables |
FR810882A (en) * | 1935-08-12 | 1937-04-01 | Lignes Telegraph Telephon | Air insulated high frequency conductor |
US2348752A (en) * | 1940-09-17 | 1944-05-16 | Int Standard Electric Corp | Electric cable |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998028756A1 (en) * | 1996-12-23 | 1998-07-02 | Marco Verdi | Cables for high-fidelity audio systems |
EP0999557A1 (en) * | 1998-11-05 | 2000-05-10 | Sagem Sa | Pair or quad high frequency transmission cable |
FR2785715A1 (en) * | 1998-11-05 | 2000-05-12 | Sagem | HIGH FREQUENCY PAIR OR QUARTE TRANSMISSION CABLE |
Also Published As
Publication number | Publication date |
---|---|
EP0485920B1 (en) | 1995-08-02 |
DE69111750T2 (en) | 1996-01-04 |
DE69111750D1 (en) | 1995-09-07 |
FR2669143B1 (en) | 1995-02-10 |
FR2669143A1 (en) | 1992-05-15 |
US5286923A (en) | 1994-02-15 |
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