EP0150879B1 - Câble à haute fréquence coaxial ininflammable - Google Patents

Câble à haute fréquence coaxial ininflammable Download PDF

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Publication number
EP0150879B1
EP0150879B1 EP85200055A EP85200055A EP0150879B1 EP 0150879 B1 EP0150879 B1 EP 0150879B1 EP 85200055 A EP85200055 A EP 85200055A EP 85200055 A EP85200055 A EP 85200055A EP 0150879 B1 EP0150879 B1 EP 0150879B1
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EP
European Patent Office
Prior art keywords
high frequency
frequency cable
insulation
protective sheath
coaxial high
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.)
Expired - Lifetime
Application number
EP85200055A
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German (de)
English (en)
Other versions
EP0150879A2 (fr
EP0150879A3 (en
Inventor
Hans Leo Ditscheid
Walter Burger
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Priority to AT85200055T priority Critical patent/ATE65639T1/de
Publication of EP0150879A2 publication Critical patent/EP0150879A2/fr
Publication of EP0150879A3 publication Critical patent/EP0150879A3/de
Application granted granted Critical
Publication of EP0150879B1 publication Critical patent/EP0150879B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • 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

Definitions

  • the invention relates to a flame-retardant coaxial high-frequency cable, consisting of a cylindrical inner conductor, an insulation surrounding the inner conductor, a flexible, cylindrical outer conductor surrounding the insulation and a protective sheath surrounding the outer conductor.
  • the invention defined in claim 1 is based on the object of specifying a structure for coaxial high-frequency cables with which, on the one hand, the electrical conditions are maintained and, on the other hand, the flame resistance is increased to such an extent that the cables meet the test conditions specified above without the cable costs becoming immeasurably high and without the cable dimensions, ie the cross section of the cable, significantly enlarged.
  • the measures according to the invention first of all ensure that the insulation between the inner and outer conductors can expand when heated, so that a very high internal pressure does not necessarily and immediately arise because at least 30% of the volume of space between the inner and outer conductors is available for the expansion stand.
  • the latter consists of several layers, which provide a tight seal with high strength surrender.
  • the protective jacket together with the aluminum foil in the outer conductor helps to greatly reduce the heat impact on the insulation.
  • the outer aluminum foil reflects the heat back where the protective jacket bursts or flakes off.
  • cellular polyethylene with a fill factor of about 50% is preferably selected in order to achieve small outer dimensions with unchanged shaft damping.
  • the longitudinal, overlapping metal foil arranged over the insulation results in a further reduction in diameter compared to a cable in which only one braid is used as the outer conductor.
  • the longitudinal film, together with the relatively dense wire spinning, provides a good seal against the ingress of oxygen and polymer leakage to the outside, because the film is supported against the dense braid under the expansion pressure of the insulating material.
  • the insulation used is a material that is preferably crosslinked by high-energy radiation, then a leakage is largely avoided. The material burns slowly or decomposes on site, i.e. it does not flow into the fire area.
  • the high-frequency cable consists of an inner conductor 1, the insulation 2, an outer conductor 3 and a protective jacket 4.
  • the insulation 2 is made of a material with a suitable dielectric constant, preferably a cellular one Polyethylene, built up. Instead of the homogeneously cellular polyolefin, another suitable design can also be selected.
  • the outer conductor 3 consists of a longitudinally running film 31, preferably made of aluminum, which overlaps at the edges and is covered to the outside by a covering 32. To achieve a correspondingly high strength, the optical covering of this covering should be 80% and more.
  • This covering 32 is wrapped with a film 33, which in turn is preferably constructed as a composite film consisting of two metal films and an interposed plastic film. It is advantageous to choose the metal foils between 9 ⁇ m and 25 ⁇ m and to place a plastic foil between 10 ⁇ m and 40 ⁇ m thick between these foils.
  • the protective jacket 4 consists of two partial sleeves 41 and 42 with an interposed tear thread 43.
  • the partial sleeve 41 represents a full protective jacket which, due to its conventional wall thickness, can be inserted unchanged into standard plug connectors.
  • the outer partial covering 42 can easily be removed with the aid of the inserted tear thread 43 over the areas over which the cables must have minimal dimensions and which are less critical in terms of fire technology.
  • the partial shell 42 of the protective jacket consists of a cross-linked or thermoplastic material with an oxygen index of ⁇ 35%. If a blowing agent is added to the subshell 42, which preferably decomposes in the temperature range from 150 ° to 200 ° when exposed to flames and in the process corrugates the melting jacket material, this results in a substantially increased thermal insulation.
  • composite foil instead of a simple metal foil has the advantage that the stretchability is increased considerably.
  • a copper foil could also be used per se, but aluminum has the advantage of greater flexibility and a lower price.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Inorganic Insulating Materials (AREA)
  • Waveguides (AREA)

Claims (8)

  1. Câble à haute fréquence coaxial ininflammable constitué par un conducteur intérieur cylindrique, un isolant entourant le conducteur intérieur, un conducteur extérieur cylindrique flexible entourant l'isolant et une gaine protectrice entourant le conducteur extérieur, caractérisé en ce que
    a) l'isolant est constitué par un matériau exempt d'halogène et remplit l'espace compris entre les conducteurs intérieur et extérieur jusqu'à moins de 70%,
    b) le conducteur extérieur cylindrique est sous forme de plusieurs "cuvettes", et constitué par une feuille métallique intérieure appliquée sur l'isolant et l'enfermant sur toute la périphérie, à axes parallèles présentant des côtés de bord chevauchants, par une enveloppe enfermant cette feuille et constituée par des fils métalliques à recouvrement optique de 80% et plus et par un enroulement de feuille métallique extérieur entourant concentriquement cette enveloppe de fil, les côtés de bord recouvrant l'enroulement extérieur d'au moins 25%,
    c) la gaine protectrice enfermant le conducteur extérieur est constituée par un matériau exempt d'halogène ininflammable dont l'indice d'oxygène est d'au moins 35% à 20°C.
  2. Câble à haute fréquence coaxial selon la revendication 1, caractérisé en ce que l'épaisseur de paroi (w) de la gaine protectrice selon la relation suivante est:
    Figure imgb0004
     expression dans laquelle
    d =   diamètre de l'isolant en mm
    LOI =   indice d'oxygène du matériau de la gaine protectrice à 20°C en %
    F =   facteur de remplissage de l'isolant entre les conducteurs intérieur et extérieur
    w =   épaisseur de paroi de la gaine protectrice en mm.
  3. Câble à haute fréquence coaxial selon la revendication 1, caractérisé en ce que l'isolant du câble et/ou de la gaine protectrice est constitué par de la matière synthétique réticulée.
  4. Câble à haute fréquence coaxial selon les revendications 1 à 3, caractérisé en ce que la gaine protectrice est constituée par deux enveloppes partielles et au-dessous de l'enveloppe partielle extrême est disposé un fil d'échirure.
  5. Câble à haute fréquence selon la revendication 1, caractérisé en ce qu'au moins l'une des feuilles métalliques utilisées est sous forme d'une feuille composite en matière synthétique-métal.
  6. Câble à haute fréquence coaxial selon la revendication 5, caractérisé en ce qu'une feuille composite est constituée par au moins deux feuilles métalliques présentant une épaisseur comprise entre 9 µm et 25 µm, entre lesquelles est disposée une feuille en matière synthétique d'une épaisseur comprise entre 10 µm et 40 µm.
  7. Câble à haute fréquence coaxial selon les revendications 5 et 6, caractérisé en ce que l'enroulement de feuille métallique pour le conducteur extérieur est constitué par de l'aluminium ou un alliage d'aluminium.
  8. Câble à haute fréquence coaxial selon la revendication 1, ainsi que 5 à 8, caractérisé en ce que le matériau d'au moins l'une des enveloppes constituant la gaine protectrice contient un agent de propulsion qui est actif lorsqu'il est exposé à des flammes.
EP85200055A 1984-01-27 1985-01-21 Câble à haute fréquence coaxial ininflammable Expired - Lifetime EP0150879B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85200055T ATE65639T1 (de) 1984-01-27 1985-01-21 Flammwidriges koaxiales hochfrequenzkabel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3402762 1984-01-27
DE19843402762 DE3402762A1 (de) 1984-01-27 1984-01-27 Flammwidriges koaxiales hochfrequenzkabel

Publications (3)

Publication Number Publication Date
EP0150879A2 EP0150879A2 (fr) 1985-08-07
EP0150879A3 EP0150879A3 (en) 1988-09-21
EP0150879B1 true EP0150879B1 (fr) 1991-07-24

Family

ID=6226043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85200055A Expired - Lifetime EP0150879B1 (fr) 1984-01-27 1985-01-21 Câble à haute fréquence coaxial ininflammable

Country Status (4)

Country Link
EP (1) EP0150879B1 (fr)
JP (1) JPS60176304A (fr)
AT (1) ATE65639T1 (fr)
DE (2) DE3402762A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2260216B (en) * 1991-10-01 1995-07-05 Northern Telecom Ltd Improvements in cables
GB2329278B (en) * 1997-07-14 2002-01-16 Delta Crompton Cables Ltd Co-axial cables
WO2019047929A1 (fr) 2017-09-08 2019-03-14 Nokia Shanghai Bell Co., Ltd. Câble radiofréquence résistant au feu

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0116754A1 (fr) * 1983-02-11 1984-08-29 Cable Technology Laboratories, Inc. Câble électrique de puissance à haute tension avec accomodation lors d'une dilatation thermique

Also Published As

Publication number Publication date
DE3583509D1 (de) 1991-08-29
DE3402762A1 (de) 1985-08-01
EP0150879A2 (fr) 1985-08-07
ATE65639T1 (de) 1991-08-15
JPS60176304A (ja) 1985-09-10
EP0150879A3 (en) 1988-09-21

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