EP0054784A2 - Câble aérien comprenant des éléments de traction - Google Patents

Câble aérien comprenant des éléments de traction Download PDF

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Publication number
EP0054784A2
EP0054784A2 EP81110134A EP81110134A EP0054784A2 EP 0054784 A2 EP0054784 A2 EP 0054784A2 EP 81110134 A EP81110134 A EP 81110134A EP 81110134 A EP81110134 A EP 81110134A EP 0054784 A2 EP0054784 A2 EP 0054784A2
Authority
EP
European Patent Office
Prior art keywords
cable
cable according
overhead line
wires
fiber bundles
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
EP81110134A
Other languages
German (de)
English (en)
Other versions
EP0054784A3 (en
EP0054784B1 (fr
Inventor
Othmar Voser
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.)
Kupferdraht-Isolierwerk AG Wildegg
Kupferdraht Isolierwerk AG
Original Assignee
Kupferdraht-Isolierwerk AG Wildegg
Kupferdraht Isolierwerk AG
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 Kupferdraht-Isolierwerk AG Wildegg, Kupferdraht Isolierwerk AG filed Critical Kupferdraht-Isolierwerk AG Wildegg
Priority to AT81110134T priority Critical patent/ATE12713T1/de
Publication of EP0054784A2 publication Critical patent/EP0054784A2/fr
Publication of EP0054784A3 publication Critical patent/EP0054784A3/de
Application granted granted Critical
Publication of EP0054784B1 publication Critical patent/EP0054784B1/fr
Expired 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
    • H01B7/08—Flat or ribbon cables
    • H01B7/0823—Parallel wires, incorporated in a flat insulating profile
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/182—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments
    • H01B7/1825—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments forming part of a high tensile strength core

Definitions

  • the invention relates to an overhead line cable with a number of individually sheathed, stranded wires, each of which comprises a plurality of metal wires provided for signal transmission and essentially at least approximately strain-resistant strain relief means extending in the longitudinal direction of the cable.
  • Overhead line cables of this type have become known in particular in the form of two-core cables as telephone lines. Such telephone lines have been used for some time primarily in areas in which individual telephone subscribers are relatively far from a central one Switching station or an end point of an underground telephone cable network and an underground laying of the telephone lines leading to the subscribers in question would cause too high a cost due to the relatively large distance and the insufficient use of a cable tunnel with only one or a few lines routed through the same.
  • steel wires were used as strain relief means, which together with the metal wires provided for signal transmission, which mostly consist of tinned copper wire, formed the individual wires of the cable.
  • strain relief means not steel wires arranged inside the cores but within the cable sheath, so to speak, as fibers, or fiber bundles made of high-strength non-metallic materials such as glass fibers, and when using such non-metallic ones Materials for the strain relief means, of course, the problem of increased susceptibility to corrosion that occurs when using steel wires is eliminated.
  • the unshaded circles are either steel wires or fiber bundles consisting of individual fibers running parallel to one another and the hatched circles are copper wires: in the case of steel wires, the copper and steel wires fix themselves in theirs Mutual position, and a change in this position due to tensile loading of the cable is therefore not possible; in the In the case of fiber bundles consisting of individual fibers, on the other hand, the individual fibers of the three external fiber bundles can easily be shifted towards the center, first filling out the six hollow spaces grouped around the central fiber bundle and then pressing the copper wires outwards until the fibers are pressed would have regrouped the outside fiber bundle into a kind of jacket around the central fiber bundle.
  • the cable would lengthen in accordance with the now smaller mean diameter of the helical course of the three outer fiber bundles, whereby the fibers of the central fiber bundle which would not withstand the tensile load alone would tear and only one relatively low tensile strength, but stretchable copper wires would be stretched accordingly.
  • the cable would thus be able to be extended to the aforementioned extension due to the regrouping and would therefore no longer be resistant to expansion.
  • the invention was based on the object of creating an overhead line cable of the type mentioned, in which, on the one hand, corrosion problems such as the known overhead line cables provided with steel wires as strain relief means do not occur, and on the other hand properties comparable to those known with regard to the tensile strength and flexibility with Has steel wires provided as strain relief overhead cables.
  • the strain relief means are formed from one or more fiber bundles running parallel to the metal wires and stranded with the same from essentially stretch-resistant synthetic fibers and the individual fiber bundle (s) in their consistency and cross-sectional shape formed from g e and arranged within the veins in such a way that in the individual wires the metal wires and fiber bundles enclosed by the assigned sheathing fix each other in their position and thus caused by tensile loads on the cable, transverse displacements of the synthetic fibers or fiber bundles which run helically due to the stranding due to the stranding and lead to stretching of the cable Core center are excluded, so that each individual core and thus the cable is essentially resistant to expansion despite the helical course of the synthetic fibers or fiber bundles.
  • the advantage of the present overhead line cable compared to the known overhead line cables of the type mentioned at the outset lies in its substantially lower susceptibility to corrosion. This can even be significantly reduced, for example, by completely impregnating the wires with resin, which would be achievable with the known overhead line cable under the (practically not feasible due to insufficient tensile strength) requirement of metal wires consisting exclusively of tinned copper wires.
  • Another advantage of the present overhead line cable compared to the known overhead line cables mentioned can be seen in the fact that the weight of the fiber bundles which act as strain relief means instead of the steel wires is the same Chen strength properties as when using steel wires is significantly lower than that of the steel wires and thereby the weight of the present overhead line cable per unit length is 20 - 40% below that of the known overhead line cables mentioned.
  • This weight advantage is essential for overhead line cables. importance because the tensile load on the cable is mainly caused by the weight of the cable.
  • each fiber bundle is essentially circular.
  • each fiber bundle is preferably stranded in order to achieve a sufficient consistency and a circular cross-sectional shape which is essentially unchangeable even when the cable is subjected to tensile loads.
  • the fiber bundles can expediently consist of simply stranded synthetic fibers. With regard to the consistency and the invariability of the cross-sectional shape, it is more advantageous if the fiber bundles consist of multi-stranded, preferably double-stranded or twisted synthetic fibers.
  • each fiber bundle is designed such that in each core the part of the interior space enclosed by the sheath of the core, which is not used by the metal wires, is completely filled by the whole of the fiber bundles.
  • each fiber bundle and / or each wire in its entirety can be particularly advantageously resin-impregnated to achieve a sufficient consistency and thus a cross-sectional shape of the fiber bundles or wires that is essentially unchangeable even when the cable is subjected to tensile loads or to increase this consistency.
  • the synthetic fibers in the individual fiber bundles are particularly suitable for the above-mentioned further advantageous embodiment of the present overhead line cable, because with this embodiment the cross-sectional shapes of the individual fiber bundles are generally not ice-shaped and it is therefore not possible to strand the individual fiber bundles within themselves .
  • the resin used for impregnation can expediently be a resin which disintegrates into powder when subjected to pressure and / or bending stress beyond its breaking limit.
  • the synthetic fibers forming the fiber bundles in the present overhead line cable expediently consist of one Plastic, preferably made of an organic polymer.
  • This plastic can be an aromatic polyamide with particular advantage.
  • the synthetic fibers can expediently have a tensile strength of at least 250 kg / mm 2 , an elastic modulus of at least 10,000 kg / mm 2 and an elongation at break of less than 3%.
  • the synthetic fibers can also consist entirely or partially of glass fibers, so-called high-strength glass fibers primarily being considered.
  • each wire can advantageously be arranged in a centrally symmetrical manner with respect to the axis of the respective wire.
  • each wire can be provided with a central metal wire, the axis of which coincides with the axis of the wire concerned, and with three outer metal wires of the same diameter as that of the central metal wire, which are at an angular distance of 120 ° around the central metal wire are arranged around and abut against this.
  • each wire can expediently either with three fiber bundles of circular cross-section and at least approximately the same diameter as that of the metal wires, which are arranged between the three outer metal wires and also rest on the central metal wire, or with three fiber bundles of approximately trapezoidal shape Cross section must be provided, each of which completely fills one of the three, each surrounded by two outer metal wires and the central metal wire and in this case cylindrical inner wall of the jacket.
  • the fiber bundles with a circular cross section are expediently stranded in themselves, while in the latter case the fiber bundles with a trapezoidal cross section expediently consist of synthetic fibers arranged parallel to one another and are impregnated with resin.
  • each wire is provided with three metal wires of the same diameter, the axes of which are at a distance of one and a half times the diameter of the metal wires from the axis of the wire concerned and which are at an angular distance of 120 ° around them Axis of the relevant wire are arranged around.
  • Each core can advantageously be provided with a central fiber bundle of circular cross-section and the same diameter as that of the metal wires, the axis of which coincides with the axis of the relevant core, as well as with three outer fiber bundles of likewise circular cross-section and the same diameter as that of the metal wires are arranged between the three metal wires and lie against the central fiber bundle; the individual fiber bundles are also expediently stranded in themselves.
  • each core with a central fiber bundle, the axis of which coincides with the axis of the relevant core, as well as with a plurality of arranged around the central fiber bundle, adjacent to it and preferably also mutually adjacent metal wires is provided.
  • the metal wires in the present overhead line cable expediently consist of copper wire, preferably of tinned copper wire.
  • the use of tinned copper wire enables the cable to be extremely susceptible to corrosion: Instead of a tin coating, other corrosion protection coatings, such as e.g. multiple paint coats may be provided.
  • the sheathing of each wire should expediently engage with its inside in depressions on the outside of the wire and essentially fill these completely. This can be achieved very simply by applying the cable sheath to the cable or the individual wires of the same by extrusion under pressure.
  • a waterproof and preferably used also water-repellent polyamide As a material for the cable sheath, a waterproof and preferably used also water-repellent polyamide.
  • the sheaths of the individual wires of the cable are expediently connected to one another by bridges between them. These bridges can be formed in the extrusion of the cable sheath by suitable design of the extruder and suitable guidance of the individual wires of the cable through the extruder.
  • the invention further relates to the use of the present overhead line cable as a telephone line for lines to be laid outdoors.
  • Two-wire overhead line cables according to the present invention are primarily considered.
  • the two wires 2 and 3 each consist of four tinned copper wires 4 and 5 of the same diameter and three fiber bundles 6 each of circular cross-section and the same diameter as that of the copper wires 4 and 5, wherein a copper wire 4 is arranged centrally and the three remaining copper wires 5 and the fiber bundles 6 are arranged in an alternating sequence around the central copper wire 4.
  • Each of the fiber bundles 6 consists of a plurality of strands of several synthetic fibers or, in short, of twisted synthetic fibers, which are stranded and stranded together.
  • the synthetic fibers consist of aromatic polyamide with a tensile strength of 300 kg / mm 2 , a modulus of elasticity of 13400 kg / mm 2 , an elongation at break of 2.6% and a specific weight of 1.45 g / cm 3 .
  • Synthetic fibers of this type are known, for example, from the information document "Kevlar 49, Technical Information, Bulletin No. K-1, June 1974" from the Dupont de Nemours Company, page 3, section A and Table I, and are generally referred to in practice as aramid fibers .
  • the wires 2 and 3 are stranded with a lay length of 10 to 15 times the wire diameter or 30 to 45 times the diameter of the copper wires 4 and 5.
  • Each of the two wires 2 and 3 is connected to electrical insulation and me at the same time mechanical protection against the effects of weather and corrosion serving sheath 7 and 8, and the two sheaths 7 and 8 together with a bridge 9 integrally connecting them form the cable sheath of the overhead line cable 1.
  • This cable sheath consists of a waterproof and preferably also water-repellent polyamide and is on the previously stranded wires 2 and 3 are applied by extrusion under pressure. Because of this type of application, the sheaths 7 and 8 engage with their inside in depressions 10 on the outside of the wires 2 and 3 and fill them up substantially.
  • the overhead line cable shown in cross section in FIG. 2 essentially corresponds in its construction to the cable shown in FIG. 1, ie there are also two wires 12 and 13 as well as four tinned copper wires 14 and 15, three fiber bundles 16 and a sheathing 17 and 18 per wire and also a bridge 19 is provided between the two sheaths 17 and 18, and the arrangement of the copper wires 14, 15 and fiber bundles 16 relative to one another essentially corresponds to that in FIG.
  • the fiber bundles 16 do not consist of twisted fibers but from fibers arranged parallel to each other in a strand-like manner and are resin-impregnated with rosin, and in addition the fiber bundles 16 here do not have a circular but an approximately trapezoidal cross-section, and the inner walls 20 of the sheaths 17 and 18 are not structured as in FIG. 1 but rather cylindrical.
  • the cable shown in FIG. 2 differs significantly in its technical properties from the cable in FIG. 1.
  • the tensile strength of the cable in FIG. 2 is much greater than that of the cable in FIG. 1, mainly because of the strand-like parallel arrangement of the fibers in the fiber bundles 16, and even exceeds the tensile strength in connection with the explanation of FIG. 1 mentioned known telephone line cable.
  • the mechanical properties of the cable in FIG. 2 are even better than those of the cable in FIG. 1 and much better than those of the corresponding known telephone line cables. In his electrical properties such as DC resistance and frequency response and also in its weight per unit length, the cable in FIG. 2 corresponds completely to the cable in FIG. 1.
  • the overhead line cable 21 shown in cross section in FIG. 3 corresponds almost completely to the cable shown in FIG. 1 and differs from it only in that the central copper wire 4 in FIG. 1 for the cable in FIG in its construction, the central fiber bundle 24 corresponding to the fiber bundles 6 in FIG. 1 is replaced. Otherwise, the two wires 22 and 23 with the outer tinned copper wires 25 and the outer fiber bundles 26 as well as the sheaths 27 and 28 together with the bridge 29 completely correspond in structure and dimensioning to the corresponding parts of the cable shown in FIG. 1.
  • the cable in FIG. 3 has a 23.7% higher DC resistance than the known telephone line cable mentioned in connection with the explanation of FIG. 1, but like the cable in FIG.
  • the cable in FIG. 3 has a smaller increase in attenuation over frequency, so that the attenuation in the voice frequency range for the cable in FIG. 3 is only slightly above the attenuation of this known telephone line cable.
  • the tensile strength of the cable in Fig. 3 is almost 40% higher and the weight per unit length is approx. 25% lower than in the known telephone line cable, and with regard to bending stiffness and tensile strength, the cable in FIG. 3 has practically the same properties as the cable in FIG. 1. Overall, the cable in FIG.
  • the overhead line cable 30 shown in cross section in FIG. 4 essentially corresponds in its construction to the cable shown in FIG. 3 and differs from it only in that instead of the four separate fiber bundles 24 and 26, a cross-sectional shape essentially corresponds to that Cross-sectional shape of all these four fiber bundles together corresponding common fiber bundle 31 is provided and the fibers of this fiber bundle are not twisted like the fibers of the fiber bundles 24 and 26 in the cable in Fig. 3 but are arranged parallel to each other like a strand.
  • the fiber bundle 31 in the cable in FIG. 4 is resin-impregnated with rosin, while the fiber bundles 24 and 26 in the cable in FIG. 3 are not provided with such resin impregnation.
  • the cable in Fig. 4 differs from the cable in FIG. 3 in that they have a 20 to 30% higher tensile strength, a somewhat higher tensile strength and a substantially higher bending stiffness. Due to this high bending stiffness, the cable in Fig. 4 is more suitable for use in areas where high tensile strength is less important than bending and resilience, because of course the rosin in the case of the cable in Fig. 4 also in the event of excessive stress disintegrates into powder in the stress areas, this cable results in much less favorable strength properties than in this area. for example in a corresponding area for the cable in FIG. 2.
  • the overhead line cables 32 and 40 shown in cross section in FIGS. 5 and 6 have compared to the cables in FIGS Figures 1 to 4 in principle a different structure of the wires 33 and 34, but agree in the design and dimensioning of their cable sheaths with the cables in Figures 1 to 4 essentially.
  • the plurality of individual fiber bundles 6 or 16 or 24, 26 provided for the cables in FIGS.
  • 1 to 3 is a single, essentially circular, centrally arranged fiber bundle 36 or 41 of about the same cross section as the total cross section of these individual fiber bundles, and this one central fiber bundle 36 or 41 is of a layer of tinned copper wires of smaller diameter than the diameter of the copper wires 4, 5, 14, 15 or 25 for the cables in surround the figures 1 to 4, whose total copper cross section corresponds to the total copper cross section of the copper wires in the cables in Figures 1 and 2.
  • the diameter of the copper wires 35 is about half the size and the number thereof is four times as large as the diameter or number of the copper wires in the cables in FIGS. 1 and 2.
  • the lay length of the stranding of the wires 33 and 34 corresponds approximately to the lay length for the cables in FIGS. 1 to 4.
  • the wires 33 and 34 are provided with sheaths 37 and 38 which are connected to one another by a bridge 39.
  • the central fiber bundle 36 in the cable 32 shown in FIG. 5 consists of twisted ten fibers
  • the fiber bundle 41 in the cable 40 shown in FIG. 6 consists of strands arranged parallel to one another in fibers and is resin-impregnated with rosin.
  • the fiber material is the same as for the cables in FIGS. 1-4.
  • the cable 32 in FIG. 5 corresponds to the properties of the cable in FIG. 5 except for its bending stiffness.
  • the bending stiffness of the cable 32 in FIG. Because of the combination of the three fiber bundles 6 provided for the cable in FIG.
  • the cable 40 in FIG Cable 32 in FIG. 5 because of the larger effective fiber cross-section of its fiber bundle 41, which results from the strand-like parallel arrangement of the fibers, about 25 to 35% higher tensile strength, and because of the resin impregnation, a somewhat greater tensile strength and also a substantially greater bending stiffness, however, as with the cable in FIG. 2, there is no increased risk of breakage of the cable or individual wires thereof.
  • the cable 40 in FIG. 6 essentially corresponds to the cable 32 in FIG. 5.

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  • Insulated Conductors (AREA)
  • Ropes Or Cables (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Cable Accessories (AREA)
  • Non-Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Organic Insulating Materials (AREA)
  • Details Of Indoor Wiring (AREA)
  • Pyrrole Compounds (AREA)
  • Pyridine Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP81110134A 1980-12-19 1981-12-04 Câble aérien comprenant des éléments de traction Expired EP0054784B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81110134T ATE12713T1 (de) 1980-12-19 1981-12-04 Freileitungskabel mit zugentlastungsmitteln.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9374/80 1980-12-19
CH937480 1980-12-19

Publications (3)

Publication Number Publication Date
EP0054784A2 true EP0054784A2 (fr) 1982-06-30
EP0054784A3 EP0054784A3 (en) 1983-03-16
EP0054784B1 EP0054784B1 (fr) 1985-04-10

Family

ID=4351327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81110134A Expired EP0054784B1 (fr) 1980-12-19 1981-12-04 Câble aérien comprenant des éléments de traction

Country Status (9)

Country Link
US (1) US4449012A (fr)
EP (1) EP0054784B1 (fr)
JP (1) JPS57124809A (fr)
AT (1) ATE12713T1 (fr)
CA (1) CA1177923A (fr)
DE (1) DE3169897D1 (fr)
ES (1) ES508146A0 (fr)
FI (1) FI814065L (fr)
NO (1) NO814227L (fr)

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CN104008796A (zh) * 2014-04-23 2014-08-27 晶锋集团股份有限公司 加强型扁电缆

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CN112233848B (zh) * 2020-11-09 2024-12-27 无锡市新阳光电缆有限公司 一种平行高负载集束架空电缆

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CA996645A (en) * 1974-05-03 1976-09-07 Canada Wire And Cable Limited Power cable having an extensible ground check conductor
NL176505C (nl) * 1974-06-27 1985-04-16 Philips Nv Dunne, soepele, elektrische verbindingsdraad alsmede werkwijze voor het vervaardigen van een dergelijke draad.
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DE2715585A1 (de) * 1977-04-07 1978-10-12 Standard Elektrik Lorenz Ag Mantelfreies kunststoffkabel
DE7817735U1 (de) * 1978-06-09 1979-02-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Zweiadrige, mantellose Leitung für Femmeldezwecke
US4319074A (en) * 1978-08-15 1982-03-09 Trw Inc. Void-free electrical conductor for power cables and process for making same
US4202164A (en) * 1978-11-06 1980-05-13 Amsted Industries Incorporated Lubricated plastic impregnated aramid fiber rope
EP0012100A1 (fr) * 1978-11-29 1980-06-11 Siemens Aktiengesellschaft Câble plat à plusieurs âmes constituées de conducteurs ronds
FR2447081A2 (fr) * 1979-01-18 1980-08-14 Cables De Lyon Geoffroy Delore Cable electrique a element porteur longitudinal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2634312A1 (fr) * 1988-07-18 1990-01-19 Cousin Cie Ets A & M Freres Cable electroporteur
WO1990001209A1 (fr) 1988-07-18 1990-02-08 Societe Cousin Freres Cable electroporteur
US5120905A (en) * 1988-07-18 1992-06-09 Cousin Freres (S.A.) Electrocarrier cable
EP0430867A1 (fr) * 1989-11-20 1991-06-05 Kupferdraht-Isolierwerk AG Wildegg Câble courant faible pour ligne aérienne avec âmes parallèles
CN104008796A (zh) * 2014-04-23 2014-08-27 晶锋集团股份有限公司 加强型扁电缆

Also Published As

Publication number Publication date
EP0054784A3 (en) 1983-03-16
JPS57124809A (en) 1982-08-03
ES8303800A1 (es) 1983-02-01
CA1177923A (fr) 1984-11-13
ATE12713T1 (de) 1985-04-15
FI814065A7 (fi) 1982-06-20
US4449012A (en) 1984-05-15
EP0054784B1 (fr) 1985-04-10
DE3169897D1 (en) 1985-05-15
ES508146A0 (es) 1983-02-01
FI814065L (fi) 1982-06-20
NO814227L (no) 1982-06-21

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