EP1293992A2 - Opto-elektrisches Hybridkabel - Google Patents

Opto-elektrisches Hybridkabel Download PDF

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Publication number
EP1293992A2
EP1293992A2 EP02102337A EP02102337A EP1293992A2 EP 1293992 A2 EP1293992 A2 EP 1293992A2 EP 02102337 A EP02102337 A EP 02102337A EP 02102337 A EP02102337 A EP 02102337A EP 1293992 A2 EP1293992 A2 EP 1293992A2
Authority
EP
European Patent Office
Prior art keywords
cable
conductors
zone
jacket
instrument
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Withdrawn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
EP02102337A
Other languages
English (en)
French (fr)
Other versions
EP1293992A3 (de
Inventor
Robert Chapuis
Pierre Lepetit
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.)
FCI SA
Original Assignee
FCI SA
Framatome Connectors International SAS
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 FCI SA, Framatome Connectors International SAS filed Critical FCI SA
Publication of EP1293992A2 publication Critical patent/EP1293992A2/de
Publication of EP1293992A3 publication Critical patent/EP1293992A3/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Withdrawn legal-status Critical Current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
    • H01B7/009—Cables with built-in connecting points or with predetermined areas for making deviations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors
    • H01B11/1821—Co-axial cables with at least one wire-wound conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1891—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor comprising auxiliary conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1895—Particular features or applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/22—Cables including at least one electrical conductor together with optical fibres

Definitions

  • An object of the present invention is an optical-electrical hybrid cable. It can be used more particularly in the field of cables used for studies in seismic geophysics, especially cables designed to be connected with a plurality of geophysical sensors distributed throughout the length of such a cable.
  • the value of the invention lies in the fact that it proposes a cable on which it is possible to mount several sensors without any need to strip this cable over a great length.
  • coaxial cables used in the field of geophysics. These coaxial cables comprise a conductive core positioned inside a first protective insulating sheath, and a conductive braiding wound about the protective insulating sheath so as to form a second conductive channel. In general, the assembly thus formed is furthermore surrounded with a second highly thick insulating, protective sheath.
  • the conductive core comprises metal conductors and/or if necessary optical fibres laid out lengthwise in parallel to one another along a main lengthwise axis of the cable.
  • the external conductive braid for its part comprises conductive strands which are gradually wound about the first insulating sheath so that a first end of this braid corresponds to a first end of the cable and so that a second end of this very same braid corresponds to a second end of the cable, the second end of the cable being opposite the first end along a main lengthwise axis of the cable.
  • the main lengthwise axis of the cable may be superimposed on a central axis of symmetry of a cylindrical tube formed by this cable when it is not subjected to any strain.
  • This coaxial cable may receive direct connections with one of the conductive elements positioned inside the cable, even in areas located between the two ends of the cable. To this end, the cable is locally stripped between the two ends. This means that a window is made in the second protective sheath so as to access at least the conductive braid. To connect an instrument serially with such a braid, it is cut or sectioned at a cutting or sectioning point. The braid is therefore sectioned and is no longer continuous. To ensure the continuity of this braid when it passes through the sensor mounted on the cable, the sheath is stripped sufficiently so as to leave two braid portions visible on either side of the sectioning point. These two braid portions may be detached from the outer periphery of the first protective sheath.
  • these two braid portions may be brought closer together so as to be placed in parallel with one another. They thus constitute unattached ends. These unattached ends are then directed toward a connector of the instrument to be connected thereto.
  • the optical fibres will be placed inside the first insulating, protective sheath and that this sheath will never be subjected to any excessively great friction.
  • the second external sheath of the cable is stripped, always locally, so as to form a window therein.
  • this window is made at a specific place in the cable.
  • This specific place in the cable corresponds to a zone at which the braid is denser.
  • the braid is formed here by a set of conductive strands wound and twisted about the first conductive sheath.
  • these conductive strands have an extra thickness. This extra thickness corresponds actually to a winding of the conductive strands with a winding pitch that is tighter than it is at other places along the cable.
  • these conductive strands are extended so as to make it possible to modify the winding pitch of the cable around the first sheath and thus form a tighter winding zone placed between two looser winding zones.
  • the conductive strands form turns that are almost parallel to one another and orthogonal to the main lengthwise axis of the cable whereas, in the other zones of the cable, where there is no provision for making any window, the turns formed by the winding of the conductive strands around the first sheath are still parallel to one another but, in this case, form an acute angle with the main lengthwise axis of the cable.
  • the value of these zones in which the conductors of the cable are variably tightened is that, when a section is made at a sectioning point in these conductors, it is easy to unwind them from the outer periphery of the first sheath and thus, in unwinding them, obtain conductive portions ready to be directly connected with a connector of the instrument. Neither making a loop with the partially stripped cable part nor stripping the cable on a large portion is necessary to obtain these long cable portions.
  • the length of the conductive portions depends on the number of turns made in the zone in which the window is made. The more turns there are, adjoining each other, the easier will it be to mount the instrument on the cable, given the working margin provided by the conductive portions.
  • the invention relates to a coaxial cable comprising a first set of conductors, a first insulating protective jacket mounted around this first set, a second set of conductors twisted around the first jacket with a twist pitch, and a protective sheath mounted around the second set and the first jacket, characterized in that the coaxial cable comprises, along a lengthwise axis of the cable, a first zone and a second zone, the twist pitch of the second zone being smaller than the twist pitch of the first zone.
  • FIG. 1 shows a cable 1 according to the invention.
  • This cable 1 is preferably a coaxial cable. It comprises a first set of conductors 2 surrounded by a first protective insulator jacket 3.
  • This protective insulator jacket 3 acts as a stiffening piece. It rigidifies the lengthwise disposition of the conductors of the first assembly 2 inside the cable 1.
  • the cable 1 has a second set of conductors 4 positioned around this first jacket 3.
  • Conductors of this second set 4 are, for example, sheathed metal strands. These metal strands are twisted around the first jacket 3. Indeed, these strands of the second set 4 do not extend in parallel to an axis formed by the conductors of the first set 2, but turn about the jacket 3.
  • the axis formed by the conductors of the first set 2 corresponds to a main lengthwise axis 11 of the cable when this cable is not subjected to any strain.
  • the strands of the second set 4 are positioned so as to form turns spaced out from one another. These turns are positioned slightly obliquely with respect to the axis 11.
  • This second set of conductors 4 is positioned in such a way that the conductors of this set get wound in being made to adjoin the first jacket 3.
  • the first jacket 3 surrounded by the twisted strands of the second set of conductors 4 is surrounded by a protective sheath 5.
  • the protection sheath 5 is made out of polyurethane and forms a continuous cylinder covering the totality of the cable 1 such that this cylinder has a thickness of about 2.1 millimetres.
  • the first jacket 3 forms a reinforcement sheath positioned between the first set of conductors 2 and the second set of conductors 4. It too has a cylindrical shape throughout length of the cable, but this reinforcement sheath has a wall with a thickness preferably smaller than that of the protective sheath 5.
  • the first set of conductors 2 is hybrid, for it has different kinds of conductors.
  • this first set of conductors 2 comprises both metal conductors 6 and optical fibres 7.
  • this first set of conductors 2 has four metallised conductors such as 6 and two optical fibres such as 7.
  • the four metal conductors may then have the following technical characteristics: a cross-section area of about 0.34 square millimetres, a flexible, tin-plated copper core surrounded by an insulator.
  • the optical fibres 7 and the metal conductors 6 are positioned on an outer periphery of a rod 8.
  • This rod 8 is preferably made of aramid fibre chosen for its non-flammable properties and high abrasion resistance and high longitudinal tensile strength. This rod 8 therefore gives the cable high tolerance with respect to external physical and climatic conditions. If the metal conductors 6 and the optical fibres 7 do not entirely cover an outer periphery 9 of this rod 8, filler rods are positioned in the interstices left between the metal conductors and/or the optical fibres. Preferably, these filler rods have a same diameter as the metal conductors 6.
  • the first set of conductors 2 is of a type different from that of the second set of conductors 4.
  • the second set of conductors 4 comprises pairs of conductive metal strands.
  • the cable 1 has three pairs of conductive strands. These three pairs of strands are positioned at equal distance on an outer periphery 10 of the first protective jacket 3.
  • these pairs of strands may be such that each strand has a flexible tin-plated copper core with a cross-section area of about 0.09 square millimetres, each of these strands being isolated and the pairs themselves being isolated.
  • the cable 1 is shown in cross section.
  • the cable 1 is sectioned parallel to the lengthwise axis 11 of this cable.
  • the lengthwise axis 11 connects a first end 12 to a second end 13 of the cable 1, the first end 12 being opposite the second end 13.
  • a first zone 14 defined as a section along the axis 11 of the roughly cylindrical tube formed by the cable 1, a special feature is observed at the second set of conductors 4.
  • a twist pitch is observed for each of the pairs of strands of the second set 4 such that it is about three times a distance 15 evaluated between a turn of a first pair of strands 16 and a neighbouring turn of a second pair of strands 17, given that there is a third pair of strands 18.
  • the twist pitch is about N times the distance between two juxtaposed turns.
  • the twist pitch of each of the conductors of the second set 4 is smaller than the one presented in the first zone 14. Indeed, in the example shown in figure 2, it can even be seen that a turn formed by the second pair of strands 17 is attached to a turn formed by the third pair 18 itself attached to a turn formed by the first pair of strands 16 itself attached again to a new turn of the second pair of strands 17 and so on and so forth. In the example shown in figure 2, the turns are tightened, to the point of completely adjoining one another.
  • the turns can be arranged in unitary groups, themselves separated by small spaces.
  • the cable 1 which, in one example, may be 200 metres long may comprise several second zones such as 19 distributed between the first zones such as 14. For example, these second zones such as 19 may be distributed evenly every 50 metres along the cable. These zones, such as 19, have for example a length along the axis 11 in the range of some centimetres.
  • the turns formed by the conductors of the second set 4 locally form an extra thickness visible at an outer periphery 20 of the protection sheath 5. Thus it is easier to detect the zone 19 in the cable 1.
  • each of the pairs of conductors of this second set 4 is sectioned so as to give two independent portions 22 and 23 of conductors on either side of a sectioning point.
  • Each of the portions 22 and 23, depending on the sectioning point with respect to the width of the second zone 19, has a length sufficient for it to be capable of being connected with a complementary apparatus.
  • a first input of a connector of the instrument is connected with the first portion 22 and a second input of the connector, equivalent for example to an output of the instrument, is connected to the second portion 23.
  • this instrument is series-mounted on the cable.
  • the sectioning point is made in a central part of this second zone 19 so as to propose two portions of conductors such as 22 and 23 having equivalent lengths.
  • this part of the stripped cable corresponding to the first set of conductors 2 surrounded by the first protective jacket 3 of the window 21.
  • the optical fibres 7, contained inside the first set of conductors 2 are protected. They may be kept parallel to the lengthwise axis 11.
  • the instrument mounted on the cable may, for example, be a terrestrial seismic geophysical sensor.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
EP02102337A 2001-09-11 2002-09-10 Opto-elektrisches Hybridkabel Withdrawn EP1293992A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0111752 2001-09-11
FR0111752A FR2829613A1 (fr) 2001-09-11 2001-09-11 Cable hybride opto-electrique

Publications (2)

Publication Number Publication Date
EP1293992A2 true EP1293992A2 (de) 2003-03-19
EP1293992A3 EP1293992A3 (de) 2003-04-02

Family

ID=8867176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02102337A Withdrawn EP1293992A3 (de) 2001-09-11 2002-09-10 Opto-elektrisches Hybridkabel

Country Status (3)

Country Link
EP (1) EP1293992A3 (de)
FR (1) FR2829613A1 (de)
NO (1) NO20024305L (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018113061A1 (de) * 2018-05-31 2019-12-05 Volkswagen Aktiengesellschaft Leiterbündel aufweisend einen Lichtwellenleiter und einen elektrischen Leiter, Verfahren zur Herstellung dieses Leiterbündels und eine Verwendung des Leiterbündels
US11590999B2 (en) 2018-05-31 2023-02-28 Volkswagen Aktiengesellschaft Heatable touch sensor and steering wheel having such a touch sensor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE885737C (de) * 1951-10-11 1953-08-06 Kabelwerk Reinshagen G M B H Elektrische Leitung, insbesondere Seismographenkabel, mit Anschlusskontakten
DE4112206A1 (de) * 1991-04-13 1992-10-15 Kaufmann Claus Peter Mehrlagenkabel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE885737C (de) * 1951-10-11 1953-08-06 Kabelwerk Reinshagen G M B H Elektrische Leitung, insbesondere Seismographenkabel, mit Anschlusskontakten
DE4112206A1 (de) * 1991-04-13 1992-10-15 Kaufmann Claus Peter Mehrlagenkabel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018113061A1 (de) * 2018-05-31 2019-12-05 Volkswagen Aktiengesellschaft Leiterbündel aufweisend einen Lichtwellenleiter und einen elektrischen Leiter, Verfahren zur Herstellung dieses Leiterbündels und eine Verwendung des Leiterbündels
US11590999B2 (en) 2018-05-31 2023-02-28 Volkswagen Aktiengesellschaft Heatable touch sensor and steering wheel having such a touch sensor

Also Published As

Publication number Publication date
NO20024305D0 (no) 2002-09-09
EP1293992A3 (de) 2003-04-02
NO20024305L (no) 2003-03-12
FR2829613A1 (fr) 2003-03-14

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