EP0732768A1 - Process for making an electrical connection to a metallic screen of a power cable and ring for carrying out the process - Google Patents

Process for making an electrical connection to a metallic screen of a power cable and ring for carrying out the process Download PDF

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Publication number
EP0732768A1
EP0732768A1 EP96400500A EP96400500A EP0732768A1 EP 0732768 A1 EP0732768 A1 EP 0732768A1 EP 96400500 A EP96400500 A EP 96400500A EP 96400500 A EP96400500 A EP 96400500A EP 0732768 A1 EP0732768 A1 EP 0732768A1
Authority
EP
European Patent Office
Prior art keywords
ring
cable
tube
electrical connection
outer casing
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
EP96400500A
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German (de)
French (fr)
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EP0732768B1 (en
Inventor
Daniel François
Xavier Ringoi
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
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Alcatel Cable SA
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Filing date
Publication date
Application filed by Alcatel Cable SA filed Critical Alcatel Cable SA
Publication of EP0732768A1 publication Critical patent/EP0732768A1/en
Application granted granted Critical
Publication of EP0732768B1 publication Critical patent/EP0732768B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • H01R4/646—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for cables or flexible cylindrical bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0512—Connections to an additional grounding conductor

Definitions

  • the present invention relates to a ring and a method for establishing an electrical connection with a metal screen of an energy cable.
  • the power cable is a high voltage power cable or a very high voltage power cable.
  • the electrical connection resulting from the implementation of the method according to the invention is provided either for grounding the metal screen of the power cable, or for a connection between metal screens in the case of a junction established between two respective ends of cables.
  • an energy cable 1 typically comprises a central conductive element 10 covered by envelopes, sheath or screen, forming successive layers in radial view.
  • the conductive element 10 is surrounded by a semiconductor screen 11.
  • This semiconductor screen 11 is itself covered by an internal insulating sheath 12 which is surrounded by a metallic screen 13, this metallic screen 13 being covered by and possibly fixed to an external insulating sheath 14.
  • other energy cable structures exist according to the prior art, which comprise additional semiconductor screen (s) and / or insulating sheath (s) (s). It should only be retained for the understanding of the invention that an energy cable further comprises a metallic screen, called a shield, 13 which is disposed between two envelopes 12 and 14 respectively inner and outer.
  • the arcuate plate, or ring, 20 may have a smooth outer surface, but preferably has protruding pins 200 formed on at least part of its outer surface, which gives it the appearance of a "cheese grater".
  • Such a ring according to Figure 2 is used as follows in the prior art. Longitudinal incisions are formed in the outer insulating sheath 14 so as to favor the introduction of the ring between the inner envelope 12 and the conductive metallic screen 13. This operation is facilitated by the fact that the metallic screen 13 is fixed , typically by gluing, to the envelope, or insulating sheath, exterior 14.
  • the arcuate plate has protruding pins formed on at least part of its outer surface, these protruding pins penetrate superficially into the screen metal to guarantee good fixing of the plate 2 between the inner insulating envelope 12 and the metal screen 13.
  • the plate 2 having conductive properties, then constitutes an electrical connection element between the metal screen 13 and a point of given connection, through connection element 21.
  • the invention aims to remedy the aforementioned drawbacks by providing a ring intended to remedy these problems of expansion of the power cable as well as a method for establishing an electrical connection with a cylindrical metallic screen disposed between an outer envelope and an envelope. interior forming part of a high or very high voltage power cable.
  • a ring for establishing an electrical connection with a metal screen which is arranged between an outer casing and an inner casing forming part of a power cable is characterized according to the invention in that it is in the form of a closed section of tube to which a connection means is fixed, and in that said section of tube has an inside diameter substantially greater than the outside diameter of said inside casing.
  • the ring has protruding pins formed on at least part of the surface of said section of tube.
  • the ring can be associated with at least one clamp.
  • a method for establishing an electrical connection with a metallic screen disposed between an outer envelope and an inner envelope forming part of a power cable comprising the step of introducing a ring between said inner envelope and said metallic screen, along a first portion of said cable, is characterized in that said ring is as defined above and in that said introduction step is preceded by a step of machining said outer casing, along a second portion of said cable which comprises said first portion and extends substantially beyond this first portion, so as to reduce the thickness of said outer envelope without making it zero, into a portion of outer envelope with reduced thickness.
  • a ring 3 differs from the prior art in that it is in the form of a closed section of tube 30.
  • a connection element 21 intended to serve as a support for the connection with a grounding box or with another connection element in the case of a junction between two respective ends of two cables.
  • This connecting element 21 can take the form of a tab but it can also consist of a screw or even a braid of conductive tape.
  • the ring 3 may have a smooth outer surface, but preferably has protruding pins 200 formed on at least part of its outer surface, which gives it the appearance of a "cheese grater".
  • the method according to the invention is now presented. It is assumed in the following description that the ring 3 is to be introduced between the insulating envelope 12 inside the metal screen 13 and this metal screen 13, along a first portion, denoted p, of the cable 1.
  • the cable is first of all stripped at its end of the metal screen 13 and outer insulating envelope 14, so as to reveal a segment S of stripped inner insulating envelope 12.
  • One A of the two ends of this segment S of the stripped inner casing 12 constitutes one end of the first portion p of the cable 1 along which the ring is to be introduced between the casing 12 and the screen 13.
  • It is then proceeded to machining the outer insulating envelope 14, along a second portion P of the cable 1 which comprises said first portion p and extends substantially beyond this first portion p.
  • This machining has the result of reducing the thickness of the outer insulating envelope 14 without making it zero, in part of an outer envelope with reduced thickness.
  • the extraction of material from the outer insulating envelope 14 along the second portion P of the cable 1 is represented by the reference 50 in FIG. 4.
  • this single machining operation is carried out prior to the introduction of the tube section 30 of the ring 3 between the inner insulating envelope 12 and the metal screen 13.
  • L machining, reducing the thickness of the outer insulating envelope 14, allows the introduction of the ring 3. It should be noted that the thickness of the outer insulating envelope 14 along the cable portion P after the machining operation is not zero so as to guarantee good electrical protection of the metal screen 13.
  • a second variant after the machining operation, provision is made to incise longitudinally, along the length of the cable 1, the part of the outer casing of reduced thickness and the cylindrical metallic screen which is arranged below, to form tongues 60, 61 and 62.
  • Longitudinal incisions 40 and 41 are designated by the references 40 and 41 in the part of Figure 3 which is located to the left of the ring 2 and which is shown in cross section. Then, the section of tube 30 forming part of the ring 3 is introduced under the tabs thus formed, along the first portion denoted p of the cable 1.
  • the tabs formed by incision are tightened on the outer surface of the tube section 30 of the ring 3.
  • the part of the tube section 30 of the ring 3 which is introduced under the tongues formed by incision comprises pins 200 projections which are formed on its surface.
  • the tube section 30 of the ring 3 has an inside diameter substantially greater than the outside diameter of the inside casing 12, leaving a space between the inside surface of the ring and the outside surface of the inner envelope.
  • This difference, or space, between the outside diameter of the inner casing 12 and the inside diameter of the tube section 30 of the ring 3 is noted ⁇ .
  • This difference in diameter is intended to allow an expansion of the cable 1 without generating high mechanical forces between the cable 1 and the ring 3. Such an expansion results from a high heating of the cable 1 which originates from a large electric current conveyed in cable 1.
  • the connecting element 21 of the ring although shown in the form of a tab in FIG. 3, can also consist, for example, of a screw or even of a braid of conductive tape.

Abstract

The ring is in the form of a short tube, the end of which has a linking piece joined to it. The tube has an internal diameter which is greater than an external diameter of an interior envelope. Projecting points are formed on at least part of the surface of the tube. A gripping collar is associated with the ring. The collar is held on the surface of the ring by tongues which are formed by cutting an exterior envelope which holds a metallic screen.

Description

La présente invention concerne une bague ainsi qu'un procédé pour établir une liaison électrique avec un écran métallique d'un câble d'énergie.The present invention relates to a ring and a method for establishing an electrical connection with a metal screen of an energy cable.

Typiquement, le câble d'énergie est un câble d'énergie haute tension ou un câble d'énergie très haute tension. La liaison électrique résultant de la mise en oeuvre du procédé selon l'invention est prévue ou bien pour une mise à la terre de l'écran métallique du câble d'énergie, ou bien pour une connexion entre écrans métalliques dans le cas d'une jonction établie entre deux extrémités respectives de câbles.Typically, the power cable is a high voltage power cable or a very high voltage power cable. The electrical connection resulting from the implementation of the method according to the invention is provided either for grounding the metal screen of the power cable, or for a connection between metal screens in the case of a junction established between two respective ends of cables.

En référence à la figure 1, un câble d'énergie 1, de forme sensiblement cylindrique, comprend typiquement un élément conducteur central 10 recouvert par des enveloppes, gaine ou écran, formant des couches successives en vue radiale. L'élément conducteur 10 est enveloppé par un écran semi-conducteur 11. Cet écran semi-conducteur 11 est lui même recouvert par une gaine isolante intérieure 12 qui est entourée par un écran métallique 13, cet écran métallique 13 étant recouvert par et éventuellement fixé à une gaine isolante extérieure 14. En pratique, d'autres structures de câble d'énergie existent selon la technique antérieure, qui comprennent des écran(s) semi-conducteur(s) et/ou gaine(s) isolante(s) additionnelle(s). Il doit seulement être retenu pour la compréhension de l'invention qu'un câble d'énergie comprend, en outre, un écran métallique, dit de blindage, 13 qui est disposé entre deux enveloppes 12 et 14 respectivement intérieure et extérieure.Referring to Figure 1, an energy cable 1, of substantially cylindrical shape, typically comprises a central conductive element 10 covered by envelopes, sheath or screen, forming successive layers in radial view. The conductive element 10 is surrounded by a semiconductor screen 11. This semiconductor screen 11 is itself covered by an internal insulating sheath 12 which is surrounded by a metallic screen 13, this metallic screen 13 being covered by and possibly fixed to an external insulating sheath 14. In practice, other energy cable structures exist according to the prior art, which comprise additional semiconductor screen (s) and / or insulating sheath (s) (s). It should only be retained for the understanding of the invention that an energy cable further comprises a metallic screen, called a shield, 13 which is disposed between two envelopes 12 and 14 respectively inner and outer.

Pour une mise à la terre de l'écran métallique 13 d'un câble d'énergie 1 ou l'établissement d'une connexion entre écrans métalliques dans le cas d'une jonction établie entre deux extrémités respectives de deux câbles, la demande de brevet européen EP-A-0 549 942 prévoit l'utilisation d'une plaquette de métal qui est arquée pour prendre la forme d'une bague cylindrique ouverte longitudinalement. La figure 2 montre une telle bague 2 selon la technique antérieure. A la bague 2, sous la forme d'une plaquette arquée 20, est fixé, par exemple par soudage, un élément de raccordement 21 destiné à servir de support à la connexion avec un boîtier de mise à la terre ou avec un autre élément de raccordement dans le cas d'une jonction entre deux extrémités respectives de deux câbles. Cet élément de raccordement 21 peut prendre la forme d'une patte, telle que représentée dans la figure 2, mais peut également consister en une vis ou encore en une tresse de ruban conducteur. La plaquette arquée, ou bague, 20 peut avoir une surface extérieure lisse, mais comporte de préférence des picots saillants 200 formés sur au moins une partie de sa surface extérieure, qui lui donne l'aspect d'une "râpe à fromage".For an earthing of the metallic screen 13 of an energy cable 1 or the establishment of a connection between metallic screens in the case of a junction established between two respective ends of two cables, the request for European patent EP-A-0 549 942 provides for the use of a metal plate which is arched to take the form of a cylindrical ring open longitudinally. Figure 2 shows such a ring 2 according to the prior art. To the ring 2, in the form of an arcuate plate 20, is fixed, for example by welding, a connecting element 21 intended to serve as support for the connection with a grounding box or with another element of connection in the case of a junction between two respective ends of two cables. This connection element 21 can take the form of a tab, as shown in FIG. 2, but can also consist of a screw or even a braid of conductive tape. The arcuate plate, or ring, 20 may have a smooth outer surface, but preferably has protruding pins 200 formed on at least part of its outer surface, which gives it the appearance of a "cheese grater".

Une telle bague selon la figure 2 est utilisée de la façon suivante dans le technique antérieure. Des incisions longitudinales sont formées dans la gaine isolante extérieure 14 de sorte à favoriser l'introduction de la bague entre l'enveloppe intérieure 12 et l'écran métallique conducteur 13. Cette opération est facilitée par le fait que l'écran métallique 13 est fixé, typiquement par collage, à l'enveloppe, ou gaine isolante, extérieure 14. Dans la variante selon laquelle la plaquette arquée comporte des picots saillants formés sur au moins une partie de sa surface extérieure, ces picots saillants viennent pénétrer superficiellement dans l'écran métallique pour garantir une bonne fixation de la plaquette 2 entre l'enveloppe isolante intérieure 12 et l'écran métallique 13. La plaquette 2, ayant des propriétés conductrices, constitue alors un élément de liaison électrique entre l'écran métallique 13 et un point de connexion donné, à travers l'élément de raccordement 21.Such a ring according to Figure 2 is used as follows in the prior art. Longitudinal incisions are formed in the outer insulating sheath 14 so as to favor the introduction of the ring between the inner envelope 12 and the conductive metallic screen 13. This operation is facilitated by the fact that the metallic screen 13 is fixed , typically by gluing, to the envelope, or insulating sheath, exterior 14. In the variant according to which the arcuate plate has protruding pins formed on at least part of its outer surface, these protruding pins penetrate superficially into the screen metal to guarantee good fixing of the plate 2 between the inner insulating envelope 12 and the metal screen 13. The plate 2, having conductive properties, then constitutes an electrical connection element between the metal screen 13 and a point of given connection, through connection element 21.

Un tel procédé selon la technique antérieure est difficile à mettre en oeuvre pour un câble à très haute tension dans lequel l'enveloppe isolante extérieure 14 possède une épaisseur élevée et donc une grande rigidité, ce qui rend difficile l'introduction d'une bague par une simple opération d'incision. En outre, ce procédé connu ne prend pas en compte le fait que les câbles à très haute tension sont sujets à des phénomènes d'expansion des matériaux utilisés qui conduisent dans la réalisation décrite à des efforts importants entre l'enveloppe isolante intérieure et la bague.Such a method according to the prior art is difficult to implement for a very high voltage cable in which the outer insulating envelope 14 has a high thickness and therefore a high rigidity, which makes the introduction of a ring difficult. a simple incision operation. In addition, this known method does not take into account the fact that very high voltage cables are subject to phenomena of expansion of the materials used which lead in the embodiment described to significant forces between the inner insulating envelope and the ring. .

L'invention vise à remédier aux inconvénients précités en fournissant une bague prévue pour remédier à ces problèmes d'expansion du câble d'énergie ainsi qu'un procédé pour établir une liaison électrique avec un écran métallique cylindrique disposé entre une enveloppe extérieure et une enveloppe intérieure formant partie d'un câble d'énergie à haute ou très haute tension.The invention aims to remedy the aforementioned drawbacks by providing a ring intended to remedy these problems of expansion of the power cable as well as a method for establishing an electrical connection with a cylindrical metallic screen disposed between an outer envelope and an envelope. interior forming part of a high or very high voltage power cable.

A cette fin, une bague d'établissement d'une liaison électrique avec un écran métallique qui est disposé entre une enveloppe extérieure et une enveloppe intérieure formant partie d'un câble d'énergie, est caractérisée selon l'invention en ce qu'elle est sous la forme d'un tronçon de tube fermé auquel est fixé un moyen de raccordement, et en ce que ledit tronçon de tube possède un diamètre intérieur sensiblement supérieur au diamètre extérieur de ladite enveloppe intérieure.To this end, a ring for establishing an electrical connection with a metal screen which is arranged between an outer casing and an inner casing forming part of a power cable, is characterized according to the invention in that it is in the form of a closed section of tube to which a connection means is fixed, and in that said section of tube has an inside diameter substantially greater than the outside diameter of said inside casing.

Avantageusement, la bague possède des picots saillants formés sur au moins une partie de la surface dudit tronçon de tube. En outre, la bague peut être associée à au moins un collier de serrage.Advantageously, the ring has protruding pins formed on at least part of the surface of said section of tube. In addition, the ring can be associated with at least one clamp.

Un procédé pour établir une liaison électrique avec un écran métallique disposé entre une enveloppe extérieure et une enveloppe intérieure formant partie d'un câble d'énergie, comprenant l'étape d'introduction d'une bague entre ladite enveloppe intérieure et ledit écran métallique, le long d'une première portion dudit câble, est caractérisé en ce que ladite bague est telle que définie ci-dessus et en ce que ladite étape d'introduction est précédée par une étape d'usinage de ladite enveloppe extérieure, le long d'une seconde portion dudit câble qui comprend ladite première portion et s'étend sensiblement au delà de cette première portion, de sorte à diminuer l'épaisseur de ladite enveloppe extérieure sans la rendre nulle, en une partie d'enveloppe extérieure à épaisseur réduite.A method for establishing an electrical connection with a metallic screen disposed between an outer envelope and an inner envelope forming part of a power cable, comprising the step of introducing a ring between said inner envelope and said metallic screen, along a first portion of said cable, is characterized in that said ring is as defined above and in that said introduction step is preceded by a step of machining said outer casing, along a second portion of said cable which comprises said first portion and extends substantially beyond this first portion, so as to reduce the thickness of said outer envelope without making it zero, into a portion of outer envelope with reduced thickness.

Par ailleurs, le procédé peut comprendre postérieurement à l'étape d'usinage et antérieurement à l'étape d'introduction, l'étape de:

  • incision longitudinale de ladite partie d'enveloppe extérieure à épaisseur réduite et dudit écran métallique qui est disposé en dessous, pour former des languettes en dessous desquelles est introduite ladite bague, et
    postérieurement à l'étape d'introduction, l'étape de
  • serrage sur la surface extérieure de ladite bague, au moyen dudit collier, desdits languettes formées par incision.
Furthermore, the method can include, after the machining step and before the introduction step, the step of:
  • longitudinal incision of said reduced thickness outer shell part and of said metal screen which is arranged below, to form tongues below which said ring is inserted, and
    after the introduction stage, the stage of
  • tightening on the outer surface of said ring, by means of said collar, said tabs formed by incision.

D'autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description suivante, en référence aux dessins annexés correspondants, dans lesquels :

  • la figure 1 montre une vue en coupe transversale d'un tronçon de câble d'énergie;
  • la figure 2 montre une vue en perspective d'une bague selon la technique antérieure pour établir une liaison électrique avec un écran métallique d'un câble d'énergie;
  • la figure 3 représente une bague selon l'invention pour établir une liaison électrique avec un écran métallique d'un câble d'énergie à très haute tension; et
  • la figure 4 montre un câble d'énergie recevant une bague du type montré à la figure 2 pour expliquer le procédé selon l'invention, seule une partie de la figure située à gauche de la bague étant représentée en coupe transversale.
Other characteristics and advantages of the present invention will appear more clearly on reading the following description, with reference to the corresponding appended drawings, in which:
  • Figure 1 shows a cross-sectional view of a section of power cable;
  • FIG. 2 shows a perspective view of a ring according to the prior art for establishing an electrical connection with a metal screen of an energy cable;
  • FIG. 3 represents a ring according to the invention for establishing an electrical connection with a metal screen of a very high voltage power cable; and
  • Figure 4 shows an energy cable receiving a ring of the type shown in Figure 2 to explain the process according to the invention, only part of the figure located to the left of the ring being shown in cross section.

En référence à la figure 3, une bague 3 selon l'invention se distingue de la technique antérieure en ce qu'elle est sous la forme d'un tronçon de tube fermé 30. A ce tronçon de tube 30 est fixé, par exemple par soudage, un élément de raccordement 21 destiné à servir de support à la connexion avec un boîtier de mise à la terre ou avec un autre élément de raccordement dans le cas d'une jonction entre deux extrémités respectives de deux câbles. Cet élément de raccordement 21 peut prendre la forme d'une patte mais il peut également consister en une vis ou encore en une tresse de ruban conducteur. La bague 3 peut avoir une surface extérieure lisse, mais comporte de préférence des picots saillants 200 formés sur au moins une partie de sa surface extérieure, qui lui donne l'aspect d'une "râpe à fromage".With reference to FIG. 3, a ring 3 according to the invention differs from the prior art in that it is in the form of a closed section of tube 30. To this section of tube 30 is fixed, for example by welding, a connection element 21 intended to serve as a support for the connection with a grounding box or with another connection element in the case of a junction between two respective ends of two cables. This connecting element 21 can take the form of a tab but it can also consist of a screw or even a braid of conductive tape. The ring 3 may have a smooth outer surface, but preferably has protruding pins 200 formed on at least part of its outer surface, which gives it the appearance of a "cheese grater".

En référence à la figure 4, il est maintenant présenté le procédé selon l'invention. Il est supposé dans la description qui suit que la bague 3 est à introduire entre l'enveloppe isolante 12 intérieure à l'écran métallique 13 et cet écran métallique 13, le long d'une première portion, notée p, du câble 1.With reference to FIG. 4, the method according to the invention is now presented. It is assumed in the following description that the ring 3 is to be introduced between the insulating envelope 12 inside the metal screen 13 and this metal screen 13, along a first portion, denoted p, of the cable 1.

Comme représenté à droite dans la figure 4, le câble est tout d'abord dépouillé à son extrémité des écran métallique 13 et enveloppe isolante extérieure 14, de sorte à laisser apparaître un segment S d'enveloppe isolante intérieure 12 dénudée. L'une A des deux extrémités de ce segment S d'enveloppe intérieure 12 dénudée constitue une extrémité de la première portion p du câble 1 le long de laquelle la bague est à introduire entre l'enveloppe 12 et l'écran 13. Il est ensuite procédé à un usinage de l'enveloppe isolante extérieure 14, le long d'une seconde portion P du câble 1 qui comprend ladite première portion p et s'étend sensiblement au delà de cette première portion p. Cet usinage a pour résultat de diminuer l'épaisseur de l'enveloppe isolante extérieure 14 sans la rendre nulle, en une partie d'enveloppe extérieure à épaisseur réduite. L'extraction de matière de l'enveloppe isolante extérieure 14 le long de la seconde portion P du câble 1 est représentée par la référence 50 dans la figure 4.As shown on the right in FIG. 4, the cable is first of all stripped at its end of the metal screen 13 and outer insulating envelope 14, so as to reveal a segment S of stripped inner insulating envelope 12. One A of the two ends of this segment S of the stripped inner casing 12 constitutes one end of the first portion p of the cable 1 along which the ring is to be introduced between the casing 12 and the screen 13. It is then proceeded to machining the outer insulating envelope 14, along a second portion P of the cable 1 which comprises said first portion p and extends substantially beyond this first portion p. This machining has the result of reducing the thickness of the outer insulating envelope 14 without making it zero, in part of an outer envelope with reduced thickness. The extraction of material from the outer insulating envelope 14 along the second portion P of the cable 1 is represented by the reference 50 in FIG. 4.

Selon une première variante du procédé selon l'invention, cette seule opération d'usinage est mise en oeuvre préalablement à l'introduction du tronçon de tube 30 de la bague 3 entre l'enveloppe isolante intérieure 12 et l'écran métallique 13. L'usinage, diminuant l'épaisseur de l'enveloppe isolante extérieure 14, permet l'introduction de la bague 3. Il est à noter que l'épaisseur de l'enveloppe isolante extérieure 14 le long de la portion de câble P après l'opération d'usinage n'est pas nulle de sorte à garantir une bonne protection électrique de l'écran métallique 13.According to a first variant of the method according to the invention, this single machining operation is carried out prior to the introduction of the tube section 30 of the ring 3 between the inner insulating envelope 12 and the metal screen 13. L machining, reducing the thickness of the outer insulating envelope 14, allows the introduction of the ring 3. It should be noted that the thickness of the outer insulating envelope 14 along the cable portion P after the machining operation is not zero so as to guarantee good electrical protection of the metal screen 13.

Avantageusement, selon une seconde variante, après l'opération d'usinage il est prévu d'inciser longitudinalement, suivant la longueur du câble 1, la partie d'enveloppe extérieure à épaisseur réduite et l'écran métallique cylindrique qui est disposé en dessous, pour former des languettes 60, 61 et 62. Des incisions longitudinales 40 et 41 sont désignées par les références 40 et 41 dans la partie de la figure 3 qui est située à gauche de la bague 2 et qui est représentée en coupe transversale. Ensuite, le tronçon de tube 30 formant partie de la bague 3 est introduit sous les languettes ainsi formées, le long de la première portion notée p du câble 1. Après avoir ainsi introduit le tronçon de tube 30 de la bague 3 entre l'enveloppe isolante intérieure 12 et l'écran métallique 13, les languettes formées par incision sont serrées sur la surface extérieure du tronçon de tube 30 de la bague 3. Pour ce serrage, il est prévu d'utiliser à titre d'exemple au moins un collier de serrage 31, 32. De préférence, la partie du tronçon de tube 30 de la bague 3 qui est introduite sous les languettes formées par incision comprend des picots saillants 200 qui sont formés sur sa surface. Selon une caractéristique très importante de l'invention, le tronçon de tube 30 de la bague 3 possède un diamètre intérieur sensiblement supérieur au diamètre extérieur de l'enveloppe intérieure 12, en laissant un espace entre la surface intérieure de la bague et la surface extérieure de l'enveloppe intérieure. Cet écart, ou espace, entre le diamètre extérieur de l'enveloppe intérieure 12 et le diamètre intérieur du tronçon de tube 30 de la bague 3 est noté δ. Cet écart de diamètre est destiné à permettre une expansion du câble 1 sans engendrer des efforts mécaniques élevés entre le câble 1 et la bague 3. Une telle expansion résulte d'un chauffage élevé du câble 1 qui a pour origine une grande intensité électrique véhiculée dans le câble 1.Advantageously, according to a second variant, after the machining operation, provision is made to incise longitudinally, along the length of the cable 1, the part of the outer casing of reduced thickness and the cylindrical metallic screen which is arranged below, to form tongues 60, 61 and 62. Longitudinal incisions 40 and 41 are designated by the references 40 and 41 in the part of Figure 3 which is located to the left of the ring 2 and which is shown in cross section. Then, the section of tube 30 forming part of the ring 3 is introduced under the tabs thus formed, along the first portion denoted p of the cable 1. After having thus introduced the section of tube 30 of the ring 3 between the envelope inner insulator 12 and the metal screen 13, the tabs formed by incision are tightened on the outer surface of the tube section 30 of the ring 3. For this tightening, it is intended to use by way of example at least one collar clamp 31, 32. Preferably, the part of the tube section 30 of the ring 3 which is introduced under the tongues formed by incision comprises pins 200 projections which are formed on its surface. According to a very important characteristic of the invention, the tube section 30 of the ring 3 has an inside diameter substantially greater than the outside diameter of the inside casing 12, leaving a space between the inside surface of the ring and the outside surface of the inner envelope. This difference, or space, between the outside diameter of the inner casing 12 and the inside diameter of the tube section 30 of the ring 3 is noted δ. This difference in diameter is intended to allow an expansion of the cable 1 without generating high mechanical forces between the cable 1 and the ring 3. Such an expansion results from a high heating of the cable 1 which originates from a large electric current conveyed in cable 1.

Il est à noter que selon cette variante, le maintien d'une faible épaisseur de l'enveloppe isolante extérieure 14 pour chacune des languettes 60, 61, 62, le long de la portion de câble P, autorise une flexion sans rupture de chaque portion d'écran métallique formant partie de l'une respective de ces languettes, lorsque le tronçon de tube 30 de la bague 3 est introduit entre l'enveloppe isolante intérieure 12 et l'écran métallique 13.It should be noted that according to this variant, maintaining a small thickness of the outer insulating envelope 14 for each of the tabs 60, 61, 62, along the cable portion P, allows bending without breaking of each portion metallic screen forming part of a respective one of these tabs, when the tube section 30 of the ring 3 is introduced between the inner insulating envelope 12 and the metallic screen 13.

L'élément de raccordement 21 de la bague, bien que représenté sous la forme d'une patte dans la figure 3, peut également consister à titre d'exemple en une vis ou encore en une tresse de ruban conducteur.The connecting element 21 of the ring, although shown in the form of a tab in FIG. 3, can also consist, for example, of a screw or even of a braid of conductive tape.

Claims (5)

Bague (3) d'établissement d'une liaison électrique avec un écran métallique (13) qui est disposé entre une enveloppe extérieure (14) et une enveloppe intérieure (12) formant partie d'un câble d'énergie (1), caractérisée en ce qu'elle est sous la forme d'un tronçon de tube (30) fermé auquel est fixé un moyen de raccordement (21), et en ce que ledit tronçon de tube (30) possède un diamètre intérieur sensiblement supérieur au diamètre extérieur de ladite enveloppe intérieure (12).Ring (3) for establishing an electrical connection with a metal screen (13) which is arranged between an outer casing (14) and an inner casing (12) forming part of an energy cable (1), characterized in that it is in the form of a closed section of tube (30) to which a connecting means (21) is fixed, and in that said section of tube (30) has an inside diameter substantially greater than the outside diameter of said inner envelope (12). Bague conforme à la revendication 1, caractérisée par des picots saillants (200) formés sur au moins une partie de la surface dudit tronçon de tube (30).Ring according to claim 1, characterized by protruding pins (200) formed on at least part of the surface of said tube section (30). Bague conforme à la revendication 1 ou 2, caractérisée en ce qu'elle est associée à au moins un collier de serrage (31,32).Ring according to claim 1 or 2, characterized in that it is associated with at least one clamp (31,32). Procédé pour établir une liaison électrique avec un écran métallique (13) disposé entre une enveloppe extérieure (14) et une enveloppe intérieure (12) formant partie d'un câble d'énergie (1), comprenant l'étape d'introduction d'une bague (3) entre ladite enveloppe intérieure (12) et ledit écran métallique (13), le long d'une première portion (p) dudit câble (1),caractérisé en ce que ladite bague est telle que définie dans l'une quelconque des revendications 1 à 3, et en ce que ladite étape d'introduction est précédée par une étape d'usinage de ladite enveloppe extérieure (14), le long d'une seconde portion (P) dudit câble (1) qui comprend ladite première portion (p) et s'étend sensiblement au delà de cette première portion (p), de sorte à diminuer l'épaisseur de ladite enveloppe extérieure (14) sans la rendre nulle, en une partie d'enveloppe extérieure à épaisseur réduite.Method for establishing an electrical connection with a metal screen (13) disposed between an outer casing (14) and an inner casing (12) forming part of a power cable (1), comprising the step of introducing a ring (3) between said inner envelope (12) and said metal screen (13), along a first portion (p) of said cable (1), characterized in that said ring is as defined in one any of claims 1 to 3, and in that said introduction step is preceded by a step of machining said outer casing (14), along a second portion (P) of said cable (1) which comprises said first portion (p) and extends substantially beyond this first portion (p), so as to reduce the thickness of said outer casing (14) without making it zero, in part of the outer casing with reduced thickness. Procédé conforme à la revendication 4, lorsque ladite bague est telle que définie dans la revendication 3 caractérisé en ce qu'il comprend postérieurement à l'étape d'usinage et antérieurement à l'étape d'introduction, l'étape de: - incision (40,41) longitudinale de ladite partie d'enveloppe extérieure (14) à épaisseur réduite et dudit écran métallique (13) qui est disposé en dessous, pour former des languettes (60,61,62) en dessous desquelles est introduite ladite bague (3), et postérieurement à l'étape d'introduction, l'étape de - serrage (31,32) sur la surface extérieure de ladite bague (3), au moyen dudit collier, desdits languettes formées par incision (60,61,62). Method according to claim 4, when said ring is as defined in claim 3 characterized in that it comprises after the machining step and before the introduction step, the step of: - longitudinal incision (40,41) of said outer casing part (14) of reduced thickness and of said metal screen (13) which is disposed below, to form tongues (60,61,62) below which is introduced said ring (3), and after the introduction stage, the stage of - Clamping (31,32) on the outer surface of said ring (3), by means of said collar, of said tongues formed by incision (60,61,62).
EP19960400500 1995-03-15 1996-03-11 Process for making an electrical connection to a metallic screen of a power cable and ring for carrying out the process Expired - Lifetime EP0732768B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9503000A FR2731849B1 (en) 1995-03-15 1995-03-15 PROCESS FOR ESTABLISHING AN ELECTRICAL CONNECTION WITH A METAL SCREEN OF AN ENERGY CABLE AND RING FOR IMPLEMENTING THE PROCESS
FR9503000 1995-03-15

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EP0732768A1 true EP0732768A1 (en) 1996-09-18
EP0732768B1 EP0732768B1 (en) 1999-10-13

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EP (1) EP0732768B1 (en)
DE (1) DE69604608T2 (en)
FR (1) FR2731849B1 (en)

Cited By (4)

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Publication number Priority date Publication date Assignee Title
WO2005036699A1 (en) * 2003-09-16 2005-04-21 Daume Patentbesitzgesellschaft Mbh Device for electroconductively contacting a partially skinned outer conductor of a coaxial cable
WO2011069547A1 (en) * 2009-12-10 2011-06-16 Prysmian S.P.A. Biasing connector
EP2894728A1 (en) * 2014-01-13 2015-07-15 Tyco Electronics Raychem GmbH Shielding connector and method and tool for installing a shielding connector
WO2017109311A1 (en) * 2015-12-23 2017-06-29 Nexans Current collector device for a cable shield, especially for an mv cable

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US2798113A (en) * 1954-03-29 1957-07-02 Bell Telephone Labor Inc Shield connectors
US3315024A (en) * 1964-11-19 1967-04-18 Thomas & Betts Corp Grounding sheath connector
US3897127A (en) * 1974-03-08 1975-07-29 Thomas & Betts Corp Means for grounding a shielded cable
EP0549942A2 (en) 1991-12-17 1993-07-07 Euromold Electrical cable junction, premounted junction assembly and manufacturing process

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Publication number Priority date Publication date Assignee Title
US2798113A (en) * 1954-03-29 1957-07-02 Bell Telephone Labor Inc Shield connectors
US3315024A (en) * 1964-11-19 1967-04-18 Thomas & Betts Corp Grounding sheath connector
US3897127A (en) * 1974-03-08 1975-07-29 Thomas & Betts Corp Means for grounding a shielded cable
EP0549942A2 (en) 1991-12-17 1993-07-07 Euromold Electrical cable junction, premounted junction assembly and manufacturing process

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005036699A1 (en) * 2003-09-16 2005-04-21 Daume Patentbesitzgesellschaft Mbh Device for electroconductively contacting a partially skinned outer conductor of a coaxial cable
WO2011069547A1 (en) * 2009-12-10 2011-06-16 Prysmian S.P.A. Biasing connector
CN102687342A (en) * 2009-12-10 2012-09-19 普睿司曼股份公司 Biasing connector
US8864503B2 (en) 2009-12-10 2014-10-21 Prysmian S.P.A. Biasing connector
EP2894728A1 (en) * 2014-01-13 2015-07-15 Tyco Electronics Raychem GmbH Shielding connector and method and tool for installing a shielding connector
WO2017109311A1 (en) * 2015-12-23 2017-06-29 Nexans Current collector device for a cable shield, especially for an mv cable
FR3046303A1 (en) * 2015-12-23 2017-06-30 Nexans CURRENT COLLECTOR DEVICE FOR CABLE SCREEN, IN PARTICULAR HTA CABLE
CN108701982A (en) * 2015-12-23 2018-10-23 耐克森公司 Current collection device for cable shielding layer especially MV cables shielding layer

Also Published As

Publication number Publication date
DE69604608T2 (en) 2000-05-31
DE69604608D1 (en) 1999-11-18
FR2731849A1 (en) 1996-09-20
EP0732768B1 (en) 1999-10-13
FR2731849B1 (en) 1997-04-30

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