EP0040035A1 - Câbles électriques - Google Patents

Câbles électriques Download PDF

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Publication number
EP0040035A1
EP0040035A1 EP81301966A EP81301966A EP0040035A1 EP 0040035 A1 EP0040035 A1 EP 0040035A1 EP 81301966 A EP81301966 A EP 81301966A EP 81301966 A EP81301966 A EP 81301966A EP 0040035 A1 EP0040035 A1 EP 0040035A1
Authority
EP
European Patent Office
Prior art keywords
insulation
tape
groups
cable
principal
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Withdrawn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
EP81301966A
Other languages
German (de)
English (en)
Inventor
Thomas Sullivan
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.)
Balfour Beatty PLC
Original Assignee
BICC PLC
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 BICC PLC filed Critical BICC PLC
Publication of EP0040035A1 publication Critical patent/EP0040035A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica

Definitions

  • This invention relates to electric cables having at least two conductors insulated from one another, and to insulated conductors for use therein.
  • the object of the invention is to provide a cable suitable for continuous service at high temperatures (say up to around 150-180°C), which resists short-circuiting for a.useful length of time (say at least 30 minutes) under fire conditions, which does not evolve any large quantity of visible smoke or toxic gas if burned, and which maintains (under normal service conditions) good mechanical and electrical properties.
  • Glass-fibre reinforced mica paper tape has been used to impart limited fire-survival characteristics to certain polymer-insulated cables, but is ineffective with most conventional high-temperature polymeric insulating materials.
  • the principal insulation is preferably extruded either as a single operation or in two (or more) steps.
  • it might be in tape form applied helically or applied longitudinally, or as a further alternative it could be applied initially in a longitudinal direction and subsequently converted to a helical form by twisting the wrapped wire (before or after applying any further layer), for example by using a flyer-type winding machine (as, conventionally used for twinning and bunching).
  • a composite layer applied partly in tape form and partly by extrusion (under, over or between tapes).
  • the outer layer is in two or more parts they may be of identical composition or they may differ within the range of polymers defined above.
  • the secondary insulation may be inside the principalinsulation (which is in most cases most effective in providing fire survival characteristics) or outside it (which tends to be better from the point of view of low combustibility and smoke hazard), or may be present in both these positions. Alternatively (or in addition) it could be interposed between layers of principal insulation.
  • the principal and secondary insulation may, but need not, be bonded together at the interface.
  • the conductor may be solid or stranded and may be of plain, tinned, nickel-plated, nickel-clad or silver- plated copper.
  • Suitable polymers for the principal insulation are described in British Patent Specifications 971,227, 1,016,245, 1,019,266, 1,019,458, 1,078,234, 1,086,021, 1,102,679, 1,153,035, 1,153,527 1,164,817, 1,177,183, 1,383,393, 1,387,303, and 1,414,421, 1,414,422, and 1,414,423 and in European Patent Application 0001879.
  • Linear polymers are usually preferred, but some can be crosslinked and this may sometimes be beneficial.
  • Polymers in which the aromatic groups are predominantly phenylene and the linking groups are selected from -0-, -CO- and -S0 2 - are preferred; most preferred are polyether-ketones and polyether sulphones in which (in both cases) -0- linkages are in the majority, and more especially para phenylene polyetherketones having about twice as many -0- linkages as -CO- linkages, such as that. sold by ICI as "PEEK”.
  • the principal insulation layer is oriented, suitable techniques for extruded layers being described in our British Patent Application 16614/78 and our European Application No. 79301544.7.
  • mica paper constituent of the tape comprising the secondary insulation is not critical, but the particles should be sufficiently densely packed to make the mica paper self-supporting; on the other hand large flakes or splittings of mica do not form an adequate substitute for mica paper.
  • Mica paper prepared from phlogopite is preferred, but muscovite mica paper can be used.
  • the reinforcing mineral fibres are preferably glass fibres, but other mineral fibres of high tensile strength (such as asbestos fibres) could be used. They may run in the longitudinal direction of the tape only, or they may run in more than one direction with or without being woven together.
  • any type of bonding resin that adheres satisfactorily to the mica paper and the fibres and has adequate flexibility and maintains electrical insulation under fire conditions can be used.
  • the preferred bonding resin is based on a silicone. Since the resin is itself a combustible material, the minimum amount of resin compatible with satisfactory bonding should be used. When the resin is heat-curable, it may usefully be in an incompletely cured state when the tape is applied.
  • the reinforced mica paper tape is preferably applied helically to the cable core, but longitudinal taping could be used provided either that the edges of the tape are overlapped and securely fixed down or that the cable core is subsequently twisted as described above.
  • a core comprises 19 annealed copper wires each 0.15mm in diameter conventionally stranded together and lapped with a 6mm wide mica paper tape applied with a nominal overlap of 50%.
  • the tape is sold by General Electric Co. under the reference number 77935 and comprises mica paper with longitudinally-extending glass fibres bonded to it with a silicone resin; its nominal overall thickness is O.lmm. over the tape is extruded a layer of a polyphenylene etherketone with about two ether linkages per ketone linkage (suitably pigmented if desired but without other additives), using a conventional thermoplastic extruder operating at about 400°C. The radial thickness of this layer is 0.4mm.
  • the core is completed by an extruded layer, 0.8mm radial, of an ethylene-acrylate composition formulated as follows:
  • Example 2 This is a core similar to Example 1 except that the mica tape is that sold under the designation 'Isola reference 366-21' comprising mica paper and a woven glass fabric bonded together with a semicured silicone resin; the dimensions are the same as in Example 1.
  • the mica tape is that sold under the designation 'Isola reference 366-21' comprising mica paper and a woven glass fabric bonded together with a semicured silicone resin; the dimensions are the same as in Example 1.
  • the cores of Examples 3 and 4 respectively are braided with 0.8mm diameter tinned annealed copper wires applied 16 spindles/5 ends/7mm lay and sheathed with the ethylene/acrylate copolymer compound set out in Example 1 above to form a cable 4.4mm diameter (sheath 0.8mm radial).
  • Example 3 and Example 4 Nineteen of the cores of Example 3 and Example 4 respectively are laid up in a conventional manner (1,6,12) with a lay length for each of the layers equal to 25 times the respective pitch diameter.
  • the core assembly (with a diameter of about 10mm) is lapped with a 25mm x 0.025mm Melinex (polyethylene terephthalate) tape applied with 20% overlap and sheathed to a radial thickness of 1.27mm with the ethylene/acrylate composition set out in Example 1; finished diameter about 12.54mm.
  • Melinex polyethylene terephthalate
  • Twisted pairs of the cores of Examples 3 and 4 respectively are lapped with a Melinex tape l5mm x 0.025mm, 20% overlap.
  • a screen of tinned annealed copper wires each 0.10mm in diameter applied 16 spindles/4 ends/l5mm lay is followed by another Melinex tape and then a Lamiglas tape with the same dimensions and overlap as the first Melinex tape.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Insulated Conductors (AREA)
  • Organic Insulating Materials (AREA)
EP81301966A 1980-05-08 1981-05-05 Câbles électriques Withdrawn EP0040035A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8015250 1980-05-08
GB8015250 1980-05-08

Publications (1)

Publication Number Publication Date
EP0040035A1 true EP0040035A1 (fr) 1981-11-18

Family

ID=10513286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81301966A Withdrawn EP0040035A1 (fr) 1980-05-08 1981-05-05 Câbles électriques

Country Status (2)

Country Link
EP (1) EP0040035A1 (fr)
AU (1) AU539952B2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138168A (en) * 1983-04-13 1984-10-17 Norsk Kabelfabrik As Fire resistant optical fibre cable
WO2001098434A1 (fr) * 2000-06-21 2001-12-27 Compagnie Royale Asturienne Des Mines S.A. Barriere de protection
EP1205529A1 (fr) * 2000-11-13 2002-05-15 COMPAGNIE ROYALE ASTURIENNE DES MINES, Société Anonyme Protection antifeu à base de mica appliquée à l'aéronautique
US6747214B2 (en) * 2000-10-20 2004-06-08 Nexans Insulated electrical conductor with preserved functionality in case of fire

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB923940A (en) * 1960-06-22 1963-04-18 Ass Elect Ind Polycarbonate resin insulated conductors
US3425865A (en) * 1965-06-29 1969-02-04 Cerro Corp Insulated conductor
NL7203717A (en) * 1972-03-20 1973-03-26 Electrical insulation sheet - of mica bonded with poly(2,6-diphenyl-para-phenylene oxide)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB923940A (en) * 1960-06-22 1963-04-18 Ass Elect Ind Polycarbonate resin insulated conductors
US3425865A (en) * 1965-06-29 1969-02-04 Cerro Corp Insulated conductor
NL7203717A (en) * 1972-03-20 1973-03-26 Electrical insulation sheet - of mica bonded with poly(2,6-diphenyl-para-phenylene oxide)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138168A (en) * 1983-04-13 1984-10-17 Norsk Kabelfabrik As Fire resistant optical fibre cable
WO2001098434A1 (fr) * 2000-06-21 2001-12-27 Compagnie Royale Asturienne Des Mines S.A. Barriere de protection
US7658983B2 (en) 2000-06-21 2010-02-09 Cogebi Societe Anonyme Protective barrier
US8173556B2 (en) 2000-06-21 2012-05-08 Cogebi Societe Anonyme Protective barrier
US6747214B2 (en) * 2000-10-20 2004-06-08 Nexans Insulated electrical conductor with preserved functionality in case of fire
EP1205529A1 (fr) * 2000-11-13 2002-05-15 COMPAGNIE ROYALE ASTURIENNE DES MINES, Société Anonyme Protection antifeu à base de mica appliquée à l'aéronautique

Also Published As

Publication number Publication date
AU539952B2 (en) 1984-10-25
AU7016981A (en) 1981-11-12

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19811127

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19830516

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SULLIVAN, THOMAS