EP2575146A2 - Vorrichtung zur mechanischen Erkennung eines durchtrennten Kabels - Google Patents

Vorrichtung zur mechanischen Erkennung eines durchtrennten Kabels 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
Authority
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Withdrawn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
Other languages
English (en)
French (fr)
Other versions
EP2575146A3 (de
Inventor
Yann Breton
Laurent Tribut
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.)
Nexans SA
Original Assignee
Nexans SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nexans SA filed Critical Nexans SA
Publication of EP2575146A2 publication Critical patent/EP2575146A2/de
Publication of EP2575146A3 publication Critical patent/EP2575146A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Electric Cable Installation (AREA)
EP12175947.6A 2011-09-28 2012-07-11 Vorrichtung zur mechanischen Erkennung eines durchtrennten Kabels Withdrawn EP2575146A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1158700A FR2980623B1 (fr) 2011-09-28 2011-09-28 Dispositif de detection de coupure de cable

Publications (2)

Publication Number Publication Date
EP2575146A2 true EP2575146A2 (de) 2013-04-03
EP2575146A3 EP2575146A3 (de) 2014-06-04

Family

ID=46458383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12175947.6A Withdrawn EP2575146A3 (de) 2011-09-28 2012-07-11 Vorrichtung zur mechanischen Erkennung eines durchtrennten Kabels

Country Status (2)

Country Link
EP (1) EP2575146A3 (de)
FR (1) FR2980623B1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
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 (de) * 2010-04-10 2011-07-12 Sabine Bröckskes Solarpaneelanschlussleitung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
FR2980623A1 (fr) 2013-03-29
EP2575146A3 (de) 2014-06-04
FR2980623B1 (fr) 2014-04-25

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