EP0197227A1 - Elektrisches Kabel, besonders für Luft- und Weltraumgebrauch mit verbesserten elektrischen Eigenschaften - Google Patents

Elektrisches Kabel, besonders für Luft- und Weltraumgebrauch mit verbesserten elektrischen Eigenschaften Download PDF

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Publication number
EP0197227A1
EP0197227A1 EP85400677A EP85400677A EP0197227A1 EP 0197227 A1 EP0197227 A1 EP 0197227A1 EP 85400677 A EP85400677 A EP 85400677A EP 85400677 A EP85400677 A EP 85400677A EP 0197227 A1 EP0197227 A1 EP 0197227A1
Authority
EP
European Patent Office
Prior art keywords
layer
insulation
varnish
cable
resin
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Withdrawn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
EP85400677A
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English (en)
French (fr)
Inventor
Edith Bascou
Michel Marechal
Jean-Pierre Ferlier
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.)
Filotex SA
Original Assignee
Filotex 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
Priority to FR8318816A priority Critical patent/FR2555799B1/fr
Application filed by Filotex SA filed Critical Filotex SA
Priority to EP85400677A priority patent/EP0197227A1/de
Publication of EP0197227A1 publication Critical patent/EP0197227A1/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Withdrawn legal-status Critical Current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
    • H01B7/02—Disposition of insulation
    • H01B7/0241—Disposition of insulation comprising one or more helical wrapped layers of insulation
    • H01B7/025—Disposition of insulation comprising one or more helical wrapped layers of insulation comprising in addition one or more other layers of non-helical wrapped insulation
    • 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
    • H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat

Definitions

  • the present invention relates to an electrical cable, in particular for aerospace use, with improved electrical characteristics, comprising a central conductor, a first layer of insulation, and at least a second layer of insulation around the first, one of these. ci being formed by a strip of polyimide synthetic resin wound helically, and the different layers being joined together by heat treatment. Such a cable is particularly suitable for aeronautical and space applications.
  • Cables of this type are already known, in which the insulation consists of one or more strips of polyimide synthetic resin, in particular of the quality sold under the brand "Kapton F" by the lich du Pont de Nemours, taped around the conductor central, with the various layers joined together by heating, then coated with a varnish resistant to a high temperature, for example a polyimide varnish.
  • Cables have also been used, the central conductor of which is surrounded by an extruded thermoplastic insulation, for example made of a copolymer of ethylene and tetrafluoroethylene, crosslinked or not.
  • Cables whose insulation consists of one or more strips of polyimide resin have insufficient resistance to the path of the electric arc during overvoltages or short-circuits. In addition, they lack flexibility and must be stripped with perfectly calibrated tools.
  • the object of the present invention is to provide an electric cable having excellent resistance to arc tracking, a sou satisfactory pliability and strippability, while being compact and light, and resistant to thermal overloads and high electrical overvoltages.
  • the electric cable according to the invention is characterized in that the second layer is formed by an extruded layer of a non-crosslinked thermoplastic resin perfluoroalkoxy or polyether-ether-ketone.
  • the electric cable according to the invention has three superposed insulation layers, it is characterized in that the first insulation layer is formed by an extruded layer of a non-crosslinked thermoplastic resin perfluoroalkoxy or polyether-ether-ketone, in that the second layer of insulation is formed by a strip of synthetic polyimide resin wound helically around the first, and in that the third layer is formed by a varnish hardened by heat treatment of class resistant to a temperature of at least minus 150 ° C.
  • the thickness of the varnish is preferably from 10 to 100 microns.
  • the varnish is preferably a polyurethane varnish.
  • the first insulation layer is formed by a strip of polyimide resin wound helically around the conductor, and its second insulation layer is formed by an extruded layer of a non-crosslinked thermoplastic resin perfluoroalkoxy or polyether-ether-ketone, devoid of protective varnish.
  • the invention further extends to an electric cable comprising a central conductor, a first layer of insulation, and at least a second layer of insulation around the first, characterized in that one of these layers is formed. by a strip of polyazole or polyparabane synthetic resin wound helically, and the other is formed by an extruded layer of a non-crosslinked thermoplastic resin perfluoroalkoxy or polyether-ether-ketone.
  • the thickness of each of the cable insulation layers of the invention is preferably between 0.04 mm and 0.35 mm.
  • FIGS. 1 and 2 relate to cables comprising a layer of thermoplastic resin in addition to the layer of polyimide resin, better results are already obtained than with known cables by providing a layer of a thermosetting synthetic resin, in particular polytetrafluoroethylene, either between the conductor and the polyimide resin tape, or above it.
  • the cable comprises a central conductor 1, a layer 2 of thermoplastic resin such as a perfluoroalkoxy resin, a polyether-ether-ketone resin, or a copolymer resin of ethylene and tetrafluoroethylene, which may or may not be crosslinked , for example by irradiation, a layer 3 formed by a ribbon band of polyimide resin, in particular that sold by the company of Pont de Nemours under the brand "Kapton F", and finally a layer 4 of varnish resistant to at least 150 ° C, for example a fluorocarbon varnish, a polyimide varnish, a polyamidimide varnish or a polyurethane varnish, etc.
  • thermoplastic resin such as a perfluoroalkoxy resin, a polyether-ether-ketone resin, or a copolymer resin of ethylene and tetrafluoroethylene, which may or may not be crosslinked , for example by irradiation
  • a layer 3 formed by a ribbon band of
  • the central conductor 1 can be made of copper or copper alloy, protected by a coating of tin, silver or nickel, or else of aluminum or aluminum alloy, protected or not by a metallic coating, in particular of tin or nickel. It generally consists of several twisted strands. Its diameter is 1 mm.
  • the layer of thermoplastic resin 2, with a softening point at least equal to 250 ° C, and preferably at least equal to 300 ° C, obtained by extrusion around the central conductor, has a radial thickness of 0.07 mm.
  • Layer 3 formed by the strip of polyimide resin tape "Kapton F" has a thickness of 0.06 mm.
  • a thermoplastic coating of copolymer of ethylene and fluorinated propylene is achieved by heating to at least 275 ° C for 15 seconds to 3 minutes.
  • the varnish 4 for coating the layer 3 has a thickness of 0.02 mm. It is for example a polyurethane varnish, formed of several successive layers applied by dipping, each coating pass being followed by a drying and baking operation at at least 250 ° C for 15 seconds to 3 minutes.
  • the cable comprises a central conductor 11, a layer 13 formed by a polyimide strip "KAPTON F" with layers joined together by heat treatment, and a layer 12 of a thermoplastic resin, deposited by extrusion, without coating of a varnish.
  • the layer 13 of polyimide resin has the same thickness as that described with reference to FIG. 1, and the bonding of its layers is ensured in the same way.
  • the conductor when it is made up of several tinned copper strands, will preferably be manufactured by the process which was the subject of patent application FR-A-2472253 of the applicant, so as to avoid soldering of its strands between them, while allowing the layers of the polyimide resin strip to be bonded together.
  • the thermoplastic resin of layer 12 is for example a copolymer of ethylene and fluorinated propylene, a copolymer of ethylene and tetrafluoroethylene, a polyether-ether-ketone or a perfluoroalkoxy resin. Its thickness is the same as that of the layer of thermoplastic resin in FIG. 1.
  • the fluorinated ethylene-propylene copolymer acting as an adhesive for the "Kapton F" polyimide resin can optionally be replaced by another adhesive.
  • Some of these, in particular those based on polyesters or on silicones, are compatible with the use as thermoplastic resin of the first layer of the cable shown in FIG. 1 of another polymer such as a copolymer of ethylene and of fluorinated propylene, a copolymer of ethylene and uncrosslinked tetrafluoroethylene, or polyvinylidene fluoride.
  • the insulation layer other than that of polyimide resin ensures better resistance to the path of the electric arc, preventing any arcing with the adjacent cables of a bundle. , than the insulation of a known cable. This improvement is all the more significant as this other layer of insulation is thicker, and it is more marked when the resin of this layer is a thermoplastic resin.
  • the polyimide resin layer provides excellent thermal and mechanical resistance and good resistance to large overvoltages.
  • the combination of the two insulation layers makes it possible to give the cable a thickness, and consequently a weight, which is lower than for a cable with thermoplastic resin insulation, and also ensures a more smoke emission rate in the event of fire. low.
  • the arc path resistance test device represented in FIG. 3 comprises a cable element to be tested 21, with a length of 20 cm, notched in the middle by a slot 22 from 0.13 to 0.25 mm wide reaching the central conductor.
  • This cable element is placed between two other adjacent cable elements 23, 24 which are identical, but not notched, arranged like it 0.25 mm above a flat aluminum plate 25, cleaned and pickled for remove all impurities and traces of oxide, and earth at 26.
  • the two conductors of the elements 23, 24 are connected at their ends by conductors 27, 28, and connected on one side to the aluminum plate 25 and by it to the earth.
  • the cable element 21 to be tested is arranged in a circuit comprising a power supply 29, which can be either continuously at 28 volts or alternatively 400 Hz at 115 volts.
  • the circuit further comprises a circuit breaker 30 tripping at 7.5 amps, a load resistor 31 and an ammeter 32.
  • a burette 33 disposed vertically from the slot 22 of the element to be tested is filled with a solution of sodium chloride at 3% by weight. Its tap 34 is adjusted so as to let the solution drop drop by drop on the slot.
  • the arc path resistance test which is more severe than that defined in standard ASTM D 3638-77, and intended to correspond to the conditions of use of cables on board aircraft, is as follows.
  • the test is continued for 24 hours, even when the driver breaks, except in the event of circuit breaker operation.
  • the phenomena and the appearance of the cable elements are observed at the end of the test.
  • the surface propagation of the arc on the central cable element must not exceed 10 mm.
  • control cable and the cable of the invention are first subjected to the DC test at 28 volts.
  • the central conductor breaks after approximately 10 minutes.
  • the deterioration of the insulation spreads to the adjacent cables.
  • the test is stopped after 3 h by tripping of the circuit breaker. There is arcing with the other conductors, and propagation of the arc over approximately 50 mm.
  • the central conductor breaks after approximately 20 hours. After 24 h, no propagation of the arc is observed, nor visible damage on the adjacent cables.
  • control cable and the cable of the invention are then subjected to the test in alternating current 115 volts, 400 Hz.
  • the central conductor breaks after 5 minutes.
  • the arc quickly propagates to the adjacent cables and trips the circuit breaker.
  • the central conductor breaks after 5 h. After 24 hours, the arc has spread over 3 mm on the central cable. There is no propagation of the arc to the adjacent cables.
  • the cable according to the invention is more particularly suitable for uses in aviation and on spacecraft, but it is also advantageous in all applications where it is desired to have a small footprint, excellent mechanical and thermal resistance and great security against with regard to the possibility of fire due to short circuits or loss of insulation.

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  • Laminated Bodies (AREA)
  • Insulated Conductors (AREA)
  • Organic Insulating Materials (AREA)
EP85400677A 1983-11-25 1985-04-04 Elektrisches Kabel, besonders für Luft- und Weltraumgebrauch mit verbesserten elektrischen Eigenschaften Withdrawn EP0197227A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8318816A FR2555799B1 (fr) 1983-11-25 1983-11-25 Cable electrique, notamment pour usage aerospatial, a caracteristiques electriques ameliorees
EP85400677A EP0197227A1 (de) 1983-11-25 1985-04-04 Elektrisches Kabel, besonders für Luft- und Weltraumgebrauch mit verbesserten elektrischen Eigenschaften

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8318816A FR2555799B1 (fr) 1983-11-25 1983-11-25 Cable electrique, notamment pour usage aerospatial, a caracteristiques electriques ameliorees
EP85400677A EP0197227A1 (de) 1983-11-25 1985-04-04 Elektrisches Kabel, besonders für Luft- und Weltraumgebrauch mit verbesserten elektrischen Eigenschaften

Publications (1)

Publication Number Publication Date
EP0197227A1 true EP0197227A1 (de) 1986-10-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85400677A Withdrawn EP0197227A1 (de) 1983-11-25 1985-04-04 Elektrisches Kabel, besonders für Luft- und Weltraumgebrauch mit verbesserten elektrischen Eigenschaften

Country Status (2)

Country Link
EP (1) EP0197227A1 (de)
FR (1) FR2555799B1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2617325A1 (fr) * 1987-06-25 1988-12-30 Aerospatiale Cable electrique, notamment pour aeronef
EP0380245A1 (de) * 1989-01-27 1990-08-01 AT&T Corp. Gefüllte Kabel, die nichthalogenierte Kunststoffe enthalten
EP0380244A1 (de) * 1989-01-27 1990-08-01 AT&T Corp. Gebäudekabel, die nichthalogenierte Kunststoffe enthalten
KR100866547B1 (ko) * 2007-02-09 2008-11-03 연세대학교 산학협력단 심전도 잡음 제거 수단을 구비한 뇌전도 검사 장치 및 방법
FR2982993A1 (fr) * 2011-11-23 2013-05-24 Axon Cable Sa Cable electrique haute tension adapte aux conditions extremes
US20130278117A1 (en) * 2012-04-20 2013-10-24 Summit Esp, Llc System and method for enhanced magnet wire insulation
US8861679B2 (en) 2010-06-11 2014-10-14 Palodex Group Oy X-ray imaging systems and methods
DE102014201992A1 (de) * 2014-02-04 2015-08-06 Leoni Bordnetz-Systeme Gmbh Elektrische Leitung sowie Verfahren zur Herstellung eines elektrischen Leitungsbündels
CN117637258A (zh) * 2023-11-29 2024-03-01 迈特诺（马鞍山）特种电缆有限公司 一种用于城轨的耐磨型电缆的加工方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2555799B1 (fr) * 1983-11-25 1987-04-17 Filotex Sa Cable electrique, notamment pour usage aerospatial, a caracteristiques electriques ameliorees
FR2602904B1 (fr) * 1986-08-05 1989-12-01 Filotex Sa Cable electrique marquable par laser
GB8716305D0 (en) * 1987-07-10 1987-08-19 Raychem Ltd Electrical wire
GB8716307D0 (en) * 1987-07-10 1987-08-19 Raychem Ltd Electrical wire
DE4041168A1 (de) * 1990-12-21 1992-07-02 Reinshagen Kabelwerk Gmbh Verfahren und vorrichtung zur herstellung einer mit fluorkarbon isolierten elektrischen leitung
FR2673318A1 (fr) * 1991-02-22 1992-08-28 Filotex Sa Procede de realisation d'une enveloppe isolante autour d'un corps allonge, et produit obtenu par ce procede.
GB9120917D0 (en) * 1991-10-01 1991-11-13 Raychem Ltd Transmission line
JP2001508588A (ja) * 1997-01-14 2001-06-26 レイケム・コーポレイション 絶縁電気導体

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3422215A (en) * 1967-02-16 1969-01-14 Westinghouse Electric Corp Insulated cable
FR1556405A (de) * 1967-12-29 1969-02-07
US4273829A (en) * 1979-08-30 1981-06-16 Champlain Cable Corporation Insulation system for wire and cable
FR2555799A1 (fr) * 1983-11-25 1985-05-31 Filotex Sa Cable electrique, notamment pour usage aerospatial, a caracteristiques electriques ameliorees

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3168417A (en) * 1963-09-25 1965-02-02 Haveg Industries Inc Polyimide coated fluorocarbon insulated wire
FR1579035A (de) * 1968-06-18 1969-08-22

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3422215A (en) * 1967-02-16 1969-01-14 Westinghouse Electric Corp Insulated cable
FR1556405A (de) * 1967-12-29 1969-02-07
US4273829A (en) * 1979-08-30 1981-06-16 Champlain Cable Corporation Insulation system for wire and cable
FR2555799A1 (fr) * 1983-11-25 1985-05-31 Filotex Sa Cable electrique, notamment pour usage aerospatial, a caracteristiques electriques ameliorees

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2617325A1 (fr) * 1987-06-25 1988-12-30 Aerospatiale Cable electrique, notamment pour aeronef
EP0380245A1 (de) * 1989-01-27 1990-08-01 AT&T Corp. Gefüllte Kabel, die nichthalogenierte Kunststoffe enthalten
EP0380244A1 (de) * 1989-01-27 1990-08-01 AT&T Corp. Gebäudekabel, die nichthalogenierte Kunststoffe enthalten
US5024506A (en) * 1989-01-27 1991-06-18 At&T Bell Laboratories Plenum cables which include non-halogenated plastic materials
KR100866547B1 (ko) * 2007-02-09 2008-11-03 연세대학교 산학협력단 심전도 잡음 제거 수단을 구비한 뇌전도 검사 장치 및 방법
US8861679B2 (en) 2010-06-11 2014-10-14 Palodex Group Oy X-ray imaging systems and methods
FR2982993A1 (fr) * 2011-11-23 2013-05-24 Axon Cable Sa Cable electrique haute tension adapte aux conditions extremes
WO2013076416A1 (fr) 2011-11-23 2013-05-30 Axon Cable Cable electrique haute tension adapte aux conditions extremes
US20130278117A1 (en) * 2012-04-20 2013-10-24 Summit Esp, Llc System and method for enhanced magnet wire insulation
US9800110B2 (en) * 2012-04-20 2017-10-24 Summit Esp, Llc System and method for enhanced magnet wire insulation
DE102014201992A1 (de) * 2014-02-04 2015-08-06 Leoni Bordnetz-Systeme Gmbh Elektrische Leitung sowie Verfahren zur Herstellung eines elektrischen Leitungsbündels
CN117637258A (zh) * 2023-11-29 2024-03-01 迈特诺（马鞍山）特种电缆有限公司 一种用于城轨的耐磨型电缆的加工方法

Also Published As

Publication number Publication date
FR2555799B1 (fr) 1987-04-17
FR2555799A1 (fr) 1985-05-31

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