EP2575146A2 - Mechanical device for sensing a cut in a cable - Google Patents

Mechanical device for sensing a cut in a cable Download PDF

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Publication number
EP2575146A2
EP2575146A2 EP12175947A EP12175947A EP2575146A2 EP 2575146 A2 EP2575146 A2 EP 2575146A2 EP 12175947 A EP12175947 A EP 12175947A EP 12175947 A EP12175947 A EP 12175947A EP 2575146 A2 EP2575146 A2 EP 2575146A2
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EP
European Patent Office
Prior art keywords
wire
cable
tube
winder
cut
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.)
Withdrawn
Application number
EP12175947A
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German (de)
French (fr)
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EP2575146A3 (en
Inventor
Yann Breton
Laurent Tribut
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Nexans SA
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Nexans SA
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Filing date
Publication date
Application filed by Nexans SA filed Critical Nexans SA
Publication of EP2575146A2 publication Critical patent/EP2575146A2/en
Publication of EP2575146A3 publication Critical patent/EP2575146A3/en
Withdrawn legal-status Critical Current

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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
    • H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks
    • H01B7/328—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks comprising violation sensing means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires

Definitions

  • the invention relates to a device for mechanical detection of a cable cut.
  • the theft of cables, and more particularly electrical cables whose conductive elements are made of copper, are on the increase, it becomes urgent to develop appropriate techniques that can effectively fight against these thefts.
  • theft deterrent means have already been developed, such as cable markings, designed to withstand burning and chemical attacks, said means having the purpose of stopping upstream any hint of flight.
  • the invention thus relates to a mechanical device for detecting such cuts.
  • the means usually used to detect these cuts are based on OTDR (Optical Time Domain Reflectometer) and TDR (Time Domain Reflectometer) techniques respectively on optical fibers and on copper cables.
  • the principle of these techniques is to send a pulsed signal, such as light or electric current, into an optical fiber or an electrical cable, and a reflectometer measures the intensity of the reflected signal.
  • the characteristics of this reflected signal make it possible to highlight defects, a particular curvature or a cut-off of said optical fiber or of said electric cable.
  • the equipment used to apply these OTDR or TDR techniques is generally expensive, difficult to transport and above all complex to use. Thus, degradation of the electrical conductors or of an optical fiber can generate parasitic signals, which can bias the interpretation of the reflected signal.
  • cutoff detection devices of an electric cable according to the invention are reliable by providing an unequivocal result, inexpensive and are easy to implement for any type of electric cable. Indeed, they implement simple mechanical means, and commonly used for other applications, said means being judiciously arranged relative to the cable to fully perform their function of detecting cutting said cable.
  • the invention relates to a device for mechanical detection of a cut of an electric cable comprising at least one electrical conductor.
  • the main characteristic of a device according to the invention is that it comprises a wire connected to at least one automatic winder, the wire being placed along the cable under mechanical tension, so that a break in said cable causes a cut of said wire, which rewinds immediately around the winder.
  • the wire under mechanical tension placed along said cable is also found cut, and the winder rewinds immediately said wire released.
  • the wire wrapped around the reel is a visual signal indicating that a break in the electrical cable has occurred.
  • the length of the wound wire can be easily determined, it is then possible to accurately go back to the location of the voluntary cut.
  • the wire may be made with any type of inert material capable of being put under mechanical tension, and it is not necessary that said wire has any property of electrical or thermal conduction, or of elasticity.
  • This wire can be placed either outside the cable or inside it.
  • the second configuration is preferred, to prevent a thief to know its existence, or to make it difficult to access. It is assumed that the end of the wire which is opposite to that which is connected to the winder, is fixed and irremovable, or is itself connected to a second winder.
  • the mechanical term means that the principle of a detection device according to the invention is based solely on inert solid parts, which do not require additional energy sources, such as, for example, an electrical or electronic circuit, or electrical or electronic sensors. detecting a power failure.
  • the wire extends over the entire length of the cable. In this way, no sector of the cable can escape this protection device. It is assumed that the wire is energized in a longitudinal direction of the cable. According to another preferred embodiment of a device according to the invention, the wire under mechanical tension is placed only at level of certain strategic segments of the power cable, where the risk of theft is highest.
  • each winder comprises a trigger sensor.
  • the sudden and sudden decrease in the mechanical tension of the yarn, which is due to the cutting of said yarn is instantly identified by the sensor which triggers immediately the rotation of the winder.
  • each winder comprises an alarm, which is triggered when said winder rewinds the wire.
  • the alarm is triggered when the reel starts to be activated.
  • This alarm can be audible, for example in the form of a siren sound identifiable, or be visual in the form for example, a light that turns on or blinks. This alarm informs in real time that a mechanical shutdown has just taken place, and thus allows the persons responsible for the security of the facilities to move to the scene of said cut.
  • each winder is provided with an apparatus for automatically determining the total length of the wound wire, and to display said length. It is necessary to know this information as quickly as possible, in order to instantly locate the place of the cut, and to be able to intervene without delay.
  • the device comprises a rigid tube extending along the cable, the wire being housed in said tube.
  • the wire can not interfere directly with the conductors of the cable, and therefore does not risk rubbing against said conductors during rewinding.
  • there is a clearance between the wire and said tube in order to preserve the mechanical independence of said wire with said tube, and thus to promote the movement of the wire in the tube during rewinding.
  • the tube is placed inside the cable. In this way, it can not be accessible by a person, and can not be neutralized.
  • the cable comprises a plurality of conductors, the tube housing the wire being placed in the middle of said conductors.
  • This is an improved configuration, to prevent a thief to quickly and easily access said wire under mechanical tension. Burying the wire in said cable adds to the safe side of said cable.
  • the tube is made of polytetrafluoroethylene. This material is preferred because it has a very low coefficient of friction with most materials.
  • the detection device according to the invention must be designed with sufficiently light materials not to excessively burden the cable, and thus adversely affect the implantation of the latter in its environment.
  • the yarn is made of a material to be selected from the group consisting of polyamide, polyoxymethylene and polyethylene terephthalate. These materials have very low friction coefficients and very light weight, and are therefore perfectly suited to the live wire.
  • the devices for detecting the rupture of a cable according to the invention have the advantage of involving light components, made with high performance materials in terms of mechanical strength and inexpensive. They also have the advantage of being able to be implemented simply. Finally, they have the advantage of being reliable and efficient.
  • a cut-off detection device of a cable 1 involves a winder (not visible in the figure), a tube 2 and a wire 3.
  • the cable 1 comprises six conductors 4 in 5, said conductors 4 being evenly distributed around a circle, thus providing a free space at the central portion of said cable 1.
  • These six conductors 4 are surrounded by an outer sheath 6.
  • central free space is occupied by the tube 2 of the cut-off device according to the invention, said tube 2 being cylindrical and polytetrafluoroethylene.
  • a nylon thread 3 may be a fishing line is housed in the central tube 2 Teflon.
  • the outer diameter of the wire 3 is smaller than the inside diameter of the tube 2, so that said wire 3 is not retained by said tube 2 and can therefore slide freely inside thereof.
  • the wire 3 is put under mechanical tension inside the tube 2 and thus inside the cable 1, between a fixed point and an automatic winder placed outside said cable 1.
  • This winder is provided with a sensor trigger, which is able to instantly identify a decline in the mechanical tension of the wire related to its cut, and therefore to cause immediately the rotation of the winder.
  • Said retractor has an audible alarm which is triggered, since the sensor has detected a cut of the wire and said reel starts to rewind the wire 3 after being cut.
  • This winder also has an apparatus for automatically determining the length of wound wire 3, this apparatus being provided with a screen displaying said length.
  • a cable cut 1 causes the following events.
  • the wire 3 under tension in said cable 1 is also cut, causing a sudden and instantaneous drop in its mechanical tension.
  • the trigger sensor identifies this mechanical voltage drop, and instantly causes the actuation of the winder which then begins to rewind the wire 3, causing the sound alarm to sound.
  • the electronic equipment indicates the length of said wire 3 wound, to know exactly where the cut took place. The people thus warned can be sent on the spot for an immediate intervention.
  • the automatic reel of the detection device according to the invention is conventional and has no technical specificity related to its particular function within said device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Electric Cable Installation (AREA)

Abstract

The device has an electric driver (4), and a wire (3) connected to an automatic roller and placed along a cable (1) while being under mechanical tension. The wire extends over entire length of the cable. The roller comprises a release sensor, and an alarm i.e. siren, that is activated when the roller rewinds the wire. Overall length of the wire is automatically determined. A rigid tube (2) extends along the cable, and the wire is placed in the tube.

Description

L'invention se rapporte à un dispositif de détection mécanique d'une coupure de câble. Les vols de câbles, et plus particulièrement des câbles électriques dont les éléments conducteurs sont en cuivre, étant en recrudescence, il devient urgent de mettre au point des techniques appropriées qui permettent de lutter efficacement contre ces vols. A ce sujet, des moyens de dissuasion de vol ont déjà été développés, comme par exemple des marquages de câbles, conçus pour résister au brûlage et aux attaques chimiques, lesdits moyens ayant pour but de stopper en amont toute velléité de vol. Malgré la mise en place de tels moyens, il arrive que des personnes parviennent à couper les câbles pour les dérober. L'invention se rapporte donc à un dispositif mécanique permettant de détecter de telles coupures.The invention relates to a device for mechanical detection of a cable cut. The theft of cables, and more particularly electrical cables whose conductive elements are made of copper, are on the increase, it becomes urgent to develop appropriate techniques that can effectively fight against these thefts. In this regard, theft deterrent means have already been developed, such as cable markings, designed to withstand burning and chemical attacks, said means having the purpose of stopping upstream any hint of flight. Despite the introduction of such means, it happens that people manage to cut the cables to steal them. The invention thus relates to a mechanical device for detecting such cuts.

Les moyens habituellement utilisés pour détecter ces coupures s'appuient sur des techniques d'OTDR (Optical Time Domain Reflectometer) et TDR (Time Domain Reflectometer) respectivement sur fibres optiques et sur des câbles de cuivre. Le principe de ces techniques consiste à envoyer un signal pulsé, comme une lumière ou un courant électrique, dans une fibre optique ou un câble électrique, et un réflectomètre mesure l'intensité du signal réfléchi. Les caractéristiques de ce signal réfléchi permettent de mettre en relief des défauts, une courbure particulière ou une coupure de ladite fibre optique ou dudit câble électrique. Les équipements utilisés pour appliquer ces techniques d'OTDR ou de TDR sont généralement chers, difficiles à transporter et surtout complexes à utiliser. Ainsi, une dégradation des conducteurs électriques ou d'une fibre optique peut engendrer des signaux parasites, qui peuvent biaiser l'interprétation du signal réfléchi.The means usually used to detect these cuts are based on OTDR (Optical Time Domain Reflectometer) and TDR (Time Domain Reflectometer) techniques respectively on optical fibers and on copper cables. The principle of these techniques is to send a pulsed signal, such as light or electric current, into an optical fiber or an electrical cable, and a reflectometer measures the intensity of the reflected signal. The characteristics of this reflected signal make it possible to highlight defects, a particular curvature or a cut-off of said optical fiber or of said electric cable. The equipment used to apply these OTDR or TDR techniques is generally expensive, difficult to transport and above all complex to use. Thus, degradation of the electrical conductors or of an optical fiber can generate parasitic signals, which can bias the interpretation of the reflected signal.

Les dispositifs de détection de coupure d'un câble électrique selon l'invention, sont fiables en proposant un résultat sans équivoque, peu coûteux et sont faciles à mettre en oeuvre pour tout type de câble électrique. En effet, ils mettent en oeuvre des moyens mécaniques simples, et couramment utilisés pour d'autres applications, lesdits moyens étant judicieusement agencés par rapport au câble pour remplir pleinement leur fonction de détection de coupure dudit câble.The cutoff detection devices of an electric cable according to the invention are reliable by providing an unequivocal result, inexpensive and are easy to implement for any type of electric cable. Indeed, they implement simple mechanical means, and commonly used for other applications, said means being judiciously arranged relative to the cable to fully perform their function of detecting cutting said cable.

L'invention se rapporte à un dispositif de détection mécanique d'une coupure d'un câble électrique comprenant au moins un conducteur électrique. La principale caractéristique d'un dispositif selon l'invention, est qu'il comprend un fil relié à au moins un enrouleur automatique, le fil étant placé le long du câble en étant sous tension mécanique, de manière à ce qu'une coupure dudit câble entraine une coupure dudit fil, qui se rembobine aussitôt autour de l'enrouleur. Ainsi, si le câble est coupé par une personne malintentionnée, le fil sous tension mécanique placé le long dudit câble se retrouve également coupé, et l'enrouleur rembobine aussitôt ledit fil libéré. Le fil enroulé autour de l'enrouleur constitue un signal visuel indiquant qu'une coupure du câble électrique a eu lieu. La longueur du fil enroulé pouvant être facilement déterminée, il est alors possible de remonter avec précision à la localisation de la coupure volontaire. Le fil peut être réalisé avec tout type de matériau inerte apte à être mis sous tension mécanique, et il n'est pas nécessaire que ledit fil possède une quelconque propriété de conduction électrique ou thermique, ou d'élasticité. Ce fil peut être placé, soit à l'extérieur du câble, soit à l'intérieur de celui-ci. La deuxième configuration est privilégiée, pour éviter à un voleur de connaître son existence, ou pour le rendre difficilement accessible. Il est supposé que l'extrémité du fil qui est opposée à celle qui est reliée à l'enrouleur, est fixe et inamovible, ou bien est elle-même reliée à un second enrouleur. Le terme mécanique signifie que le principe d'un dispositif de détection selon l'invention se fonde uniquement sur des pièces solides inertes, qui ne nécessitent ni sources énergétiques supplémentaires, telles que par exemple, un circuit électrique ou électronique, ni capteurs électriques ou électroniques de détection d'une coupure de circulation de courant électrique.The invention relates to a device for mechanical detection of a cut of an electric cable comprising at least one electrical conductor. The main characteristic of a device according to the invention is that it comprises a wire connected to at least one automatic winder, the wire being placed along the cable under mechanical tension, so that a break in said cable causes a cut of said wire, which rewinds immediately around the winder. Thus, if the cable is cut by a malicious person, the wire under mechanical tension placed along said cable is also found cut, and the winder rewinds immediately said wire released. The wire wrapped around the reel is a visual signal indicating that a break in the electrical cable has occurred. The length of the wound wire can be easily determined, it is then possible to accurately go back to the location of the voluntary cut. The wire may be made with any type of inert material capable of being put under mechanical tension, and it is not necessary that said wire has any property of electrical or thermal conduction, or of elasticity. This wire can be placed either outside the cable or inside it. The second configuration is preferred, to prevent a thief to know its existence, or to make it difficult to access. It is assumed that the end of the wire which is opposite to that which is connected to the winder, is fixed and irremovable, or is itself connected to a second winder. The mechanical term means that the principle of a detection device according to the invention is based solely on inert solid parts, which do not require additional energy sources, such as, for example, an electrical or electronic circuit, or electrical or electronic sensors. detecting a power failure.

Avantageusement, le fil s'étend sur toute la longueur du câble. De cette manière, aucun secteur du câble ne peut échapper à ce dispositif de protection. Il est supposé que le fil est mis sous tension selon une direction longitudinale du câble. Selon un autre mode de réalisation préféré d'un dispositif selon l'invention, le fil sous tension mécanique n'est placé qu'au niveau de certains segments stratégiques du câble électrique, où le risque de vol est le plus élevé.Advantageously, the wire extends over the entire length of the cable. In this way, no sector of the cable can escape this protection device. It is assumed that the wire is energized in a longitudinal direction of the cable. According to another preferred embodiment of a device according to the invention, the wire under mechanical tension is placed only at level of certain strategic segments of the power cable, where the risk of theft is highest.

De façon préférentielle, chaque enrouleur comporte un capteur de déclenchement. En effet, la baisse brutale et soudaine de la tension mécanique du fil, qui est due à la coupure dudit fil, est instantanément identifiée par le capteur qui déclenche aussitôt la mise en rotation de l'enrouleur.Preferably, each winder comprises a trigger sensor. Indeed, the sudden and sudden decrease in the mechanical tension of the yarn, which is due to the cutting of said yarn, is instantly identified by the sensor which triggers immediately the rotation of the winder.

Préférentiellement, chaque enrouleur comporte une alarme, qui se déclenche lorsque ledit enrouleur rembobine le fil. En réalité, dès que le fil se détend soudainement, l'alarme se déclenche au moment où l'enrouleur commence à être activé. Cette alarme peut être sonore, sous la forme par exemple d'une sirène au son identifiable, ou bien être visuelle sous la forme par exemple, d'un voyant qui s'allume ou qui clignote. Cette alarme informe en temps réel qu'une coupure mécanique vient d'avoir lieu, et permet ainsi aux personnes préposées à la sécurité des installations de se déplacer sur les lieux de ladite coupure.Preferably, each winder comprises an alarm, which is triggered when said winder rewinds the wire. In fact, as soon as the wire suddenly relaxes, the alarm is triggered when the reel starts to be activated. This alarm can be audible, for example in the form of a siren sound identifiable, or be visual in the form for example, a light that turns on or blinks. This alarm informs in real time that a mechanical shutdown has just taken place, and thus allows the persons responsible for the security of the facilities to move to the scene of said cut.

De façon avantageuse, chaque enrouleur est muni d'un appareillage permettant de déterminer automatiquement la longueur totale du fil enroulé, et d'afficher ladite longueur. Il est nécessaire de connaître cette information le plus rapidement possible, afin de localiser instantanément le lieu de la coupure, et de pouvoir intervenir sans attendre.Advantageously, each winder is provided with an apparatus for automatically determining the total length of the wound wire, and to display said length. It is necessary to know this information as quickly as possible, in order to instantly locate the place of the cut, and to be able to intervene without delay.

Avantageusement, le dispositif comprend un tube rigide s'étendant le long du câble, le fil étant logé dans ledit tube. De cette manière, si le tube est placé à l'intérieur du câble, le fil ne peut pas interférer directement avec les conducteurs du câble, et ne risque donc pas de se frotter auxdits conducteurs lors d'un rembobinage. Selon un mode de réalisation préféré d'un dispositif selon l'invention, il existe un jeu entre le fil et ledit tube, afin de préserver l'indépendance mécanique dudit fil avec ledit tube, et donc favoriser le déplacement du fil dans le tube lors d'un rembobinage.Advantageously, the device comprises a rigid tube extending along the cable, the wire being housed in said tube. In this way, if the tube is placed inside the cable, the wire can not interfere directly with the conductors of the cable, and therefore does not risk rubbing against said conductors during rewinding. According to a preferred embodiment of a device according to the invention, there is a clearance between the wire and said tube, in order to preserve the mechanical independence of said wire with said tube, and thus to promote the movement of the wire in the tube during rewinding.

Préférentiellement, le tube est placé à l'intérieur du câble. De cette manière, il ne peut pas être accessible par une personne, et ne peut donc pas être neutralisé.Preferably, the tube is placed inside the cable. In this way, it can not be accessible by a person, and can not be neutralized.

De façon préférentielle, le câble comprend une pluralité de conducteurs, le tube logeant le fil étant placé au milieu desdits conducteurs. Il s'agit d'une configuration améliorée, permettant d'empêcher un voleur d'accéder rapidement et facilement audit fil sous tension mécanique. Le fait d'enfouir le fil dans ledit câble ajoute au coté sécuritaire dudit câble.Preferably, the cable comprises a plurality of conductors, the tube housing the wire being placed in the middle of said conductors. This is an improved configuration, to prevent a thief to quickly and easily access said wire under mechanical tension. Burying the wire in said cable adds to the safe side of said cable.

Préférentiellement le tube est réalisé en polytétrafluoroéthylène. Ce matériau est privilégié car il présente un très faible coefficient de friction avec la plupart des matériaux. Le dispositif de détection selon l'invention doit être conçu avec des matériaux suffisamment légers pour ne pas alourdir exagérément le câble, et nuire ainsi à l'implantation de celui-ci dans son environnement.Preferably, the tube is made of polytetrafluoroethylene. This material is preferred because it has a very low coefficient of friction with most materials. The detection device according to the invention must be designed with sufficiently light materials not to excessively burden the cable, and thus adversely affect the implantation of the latter in its environment.

De façon préférentielle, le fil est réalisé dans un matériau à choisir dans le groupe constitué par le polyamide, le polyoxyméthylène et le polyéthylène téréphtalate. Il s'agit de matériaux présentant de très faibles coefficients de frottement et une très grande légèreté, et qui sont donc parfaitement adaptés au fil sous tension.Preferably, the yarn is made of a material to be selected from the group consisting of polyamide, polyoxymethylene and polyethylene terephthalate. These materials have very low friction coefficients and very light weight, and are therefore perfectly suited to the live wire.

Les dispositifs de détection de la rupture d'un câble selon l'invention présentent l'avantage de faire intervenir des pièces légères, réalisées avec des matériaux performants en matière de résistance mécanique et peu coûteux. Ils ont de plus l'avantage de pouvoir être mis en oeuvre simplement. Ils présentent enfin l'avantage d'être fiables et performants.The devices for detecting the rupture of a cable according to the invention have the advantage of involving light components, made with high performance materials in terms of mechanical strength and inexpensive. They also have the advantage of being able to be implemented simply. Finally, they have the advantage of being reliable and efficient.

On donne ci-après une description détaillée d'un dispositif de détection de coupure selon l'invention, en se référant à la figure 1.

  • La figure 1 est une vue simplifiée en perspective d'un câble électrique doté d'un dispositif de détection de coupure selon l'invention,
The following is a detailed description of a cut-off detection device according to the invention, with reference to FIG. figure 1 .
  • The figure 1 is a simplified perspective view of an electric cable equipped with a cut-off detection device according to the invention,

En se référant à la figure 1, un dispositif de détection de coupure d'un câble 1 selon l'invention, implique un enrouleur (non visible sur la figure), un tube 2 et un fil 3. Sur l'exemple illustré, le câble 1 comporte six conducteurs 4 en cuivre isolés par un diélectrique 5, lesdits conducteurs 4 étant répartis de façon régulière autour d'un cercle, ménageant ainsi un espace libre au niveau de la partie centrale dudit câble 1. Ces six conducteurs 4 sont entourés par une gaine extérieure 6. L'espace libre central est occupé par le tube 2 du dispositif de détection de coupure selon l'invention, ledit tube 2 étant cylindrique et en polytétrafluoroéthylène. Un fil 3 en nylon pouvant être un fil de pêche est logé dans le tube 2 central en téflon. Le diamètre extérieur du fil 3 est inférieur au diamètre intérieur du tube 2, si bien que ledit fil 3 n'est pas retenu par ledit tube 2 et peut donc coulisser librement à l'intérieur de celui-ci. Le fil 3 est mis sous tension mécanique à l'intérieur du tube 2 et donc à l'intérieur du câble 1, entre un point fixe et un enrouleur automatique placé à l'extérieur dudit câble 1. Cet enrouleur est doté d'un capteur de déclenchement, qui est apte à identifier instantanément une baisse de la tension mécanique du fil liée à sa coupure, et donc de provoquer aussitôt la mise en rotation de l'enrouleur. Ledit enrouleur dispose d'une alarme sonore qui se déclenche, dès lors que le capteur a détecté une coupure du fil et que ledit enrouleur se met à rembobiner le fil 3 après avoir été coupé. Cet enrouleur possède également un appareillage permettant de déterminer automatiquement la longueur de fil 3 enroulée, cet appareillage étant doté d'un écran affichant ladite longueur.Referring to the figure 1 , a cut-off detection device of a cable 1 according to the invention, involves a winder (not visible in the figure), a tube 2 and a wire 3. In the example shown, the cable 1 comprises six conductors 4 in 5, said conductors 4 being evenly distributed around a circle, thus providing a free space at the central portion of said cable 1. These six conductors 4 are surrounded by an outer sheath 6. central free space is occupied by the tube 2 of the cut-off device according to the invention, said tube 2 being cylindrical and polytetrafluoroethylene. A nylon thread 3 may be a fishing line is housed in the central tube 2 Teflon. The outer diameter of the wire 3 is smaller than the inside diameter of the tube 2, so that said wire 3 is not retained by said tube 2 and can therefore slide freely inside thereof. The wire 3 is put under mechanical tension inside the tube 2 and thus inside the cable 1, between a fixed point and an automatic winder placed outside said cable 1. This winder is provided with a sensor trigger, which is able to instantly identify a decline in the mechanical tension of the wire related to its cut, and therefore to cause immediately the rotation of the winder. Said retractor has an audible alarm which is triggered, since the sensor has detected a cut of the wire and said reel starts to rewind the wire 3 after being cut. This winder also has an apparatus for automatically determining the length of wound wire 3, this apparatus being provided with a screen displaying said length.

Une fois le câble 1 et le dispositif de détection installés à leurs emplacements définitifs en configuration opérationnelle, une coupure de câble 1entraÎne les événements suivants. Le fil 3 sous tension dans ledit câble 1 est également sectionné, entraînant une baisse brutale et instantanée de sa tension mécanique. Le capteur de déclenchement identifie cette chute de tension mécanique, et provoque instantanément l'actionnement de l'enrouleur qui se met alors à rembobiner le fil 3, provoquant le déclenchement de l'alarme sonore. Une fois le fil 3 intégralement rembobiné autour de l'enrouleur, l'appareillage électronique indique la longueur dudit fil 3 enroulé, permettant de savoir à quel endroit précis la coupure a eu lieu. Les personnes ainsi averties peuvent être dépêchées sur place pour une intervention immédiate. L'enrouleur automatique du dispositif de détection selon l'invention, est conventionnel et ne présente aucune spécificité technique liée à sa fonction particulière au sein dudit dispositif.Once the cable 1 and the detection device are installed in their final locations in operational configuration, a cable cut 1 causes the following events. The wire 3 under tension in said cable 1 is also cut, causing a sudden and instantaneous drop in its mechanical tension. The trigger sensor identifies this mechanical voltage drop, and instantly causes the actuation of the winder which then begins to rewind the wire 3, causing the sound alarm to sound. Once the wire 3 completely rewound around the reel, the electronic equipment indicates the length of said wire 3 wound, to know exactly where the cut took place. The people thus warned can be sent on the spot for an immediate intervention. The automatic reel of the detection device according to the invention is conventional and has no technical specificity related to its particular function within said device.

Claims (10)

Dispositif de détection mécanique d'une coupure d'un câble électrique (1) comprenant au moins un conducteur (4) électrique, caractérisé en ce qu'il comprend un fil (3) relié à au moins un enrouleur automatique, et en ce que le fil (3) est placé le long du câble (1) en étant sous tension mécanique, de manière à ce qu'une coupure dudit câble (1) entraine une coupure dudit fil (3), qui se rembobine aussitôt autour de l'enrouleur.Device for the mechanical detection of a cut-off of an electric cable (1) comprising at least one electrical conductor (4), characterized in that it comprises a wire (3) connected to at least one automatic winder, and in that the wire (3) is placed along the cable (1) under mechanical tension, so that a break in said cable (1) leads to a break in said wire (3), which rewinds immediately around the reel. Dispositif selon la revendication 1, caractérisé en ce que le fil (3) s'étend sur toute la longueur du câble (1).Device according to claim 1, characterized in that the wire (3) extends over the entire length of the cable (1). Dispositif selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que chaque enrouleur comporte un capteur de déclenchement.Device according to any one of claims 1 or 2, characterized in that each winder comprises a trigger sensor. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que chaque enrouleur comporte une alarme, qui se déclenche lorsque ledit enrouleur rembobine le fil (3).Device according to any one of claims 1 to 3, characterized in that each winder comprises an alarm, which is triggered when said winder rewinds the wire (3). Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que chaque enrouleur est muni d'un appareillage permettant de déterminer automatiquement la longueur totale du fil enroulé, et d'afficher ladite longueur.Device according to any one of claims 1 to 4, characterized in that each winder is equipped with an apparatus for automatically determining the total length of the wound wire, and to display said length. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il comprend un tube (2) rigide s'étendant le long du câble, le fil (3) étant logé dans ledit tube (2).Device according to any one of claims 1 to 5, characterized in that it comprises a rigid tube (2) extending along the cable, the wire (3) being housed in said tube (2). Dispositif selon la revendication 6, caractérisé en ce que le tube (2) est placé à l'intérieur du câble (1).Device according to claim 6, characterized in that the tube (2) is placed inside the cable (1). Dispositif selon la revendication 7, caractérisé en ce que le câble (1) comprend une pluralité de conducteurs (4), le tube (2) logeant le fil (3) étant placé au milieu desdits conducteurs (4).Device according to claim 7, characterized in that the cable (1) comprises a plurality of conductors (4), the tube (2) housing the wire (3) being placed in the middle of said conductors (4). Dispositif selon l'une quelconque des revendications 6 à 8, caractérisé en ce que le tube (2) est réalisé en polytétrafluoroéthylène.Device according to any one of claims 6 to 8, characterized in that the tube (2) is made of polytetrafluoroethylene. Dispositif selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le fil (3) est réalisé dans un matériau à choisir dans le groupe constitué par le polyamide, le polyoxyméthylène et le polyéthylène téréphtalate.Device according to any one of claims 1 to 9, characterized in that the wire (3) is made of a material to be selected from the group consisting of polyamide, polyoxymethylene and polyethylene terephthalate.
EP12175947.6A 2011-09-28 2012-07-11 Mechanical device for sensing a cut in a cable Withdrawn EP2575146A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1158700A FR2980623B1 (en) 2011-09-28 2011-09-28 DEVICE FOR DETECTING CABLE CUT

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EP2575146A2 true EP2575146A2 (en) 2013-04-03
EP2575146A3 EP2575146A3 (en) 2014-06-04

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FR (1) FR2980623B1 (en)

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Publication number Priority date Publication date Assignee Title
US7081822B2 (en) * 2003-12-18 2006-07-25 Se-Kure Controls, Inc. Sensing assembly for article to be monitored
DE202010004823U1 (en) * 2010-04-10 2011-07-12 Sabine Bröckskes Solarpaneelanschlussleitung

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EP2575146A3 (en) 2014-06-04
FR2980623B1 (en) 2014-04-25

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