EP0930804B1 - Câble chauffant - Google Patents

Câble chauffant Download PDF

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Publication number
EP0930804B1
EP0930804B1 EP98403315A EP98403315A EP0930804B1 EP 0930804 B1 EP0930804 B1 EP 0930804B1 EP 98403315 A EP98403315 A EP 98403315A EP 98403315 A EP98403315 A EP 98403315A EP 0930804 B1 EP0930804 B1 EP 0930804B1
Authority
EP
European Patent Office
Prior art keywords
layer
conductors
conductor
earthing
extruded
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
EP98403315A
Other languages
German (de)
English (en)
Other versions
EP0930804A3 (fr
EP0930804A2 (fr
Inventor
Kristin Fagerhaug Sommerfelt
Ivar Granheim
Kare Asper
Tom Harald Birkeland
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.)
Nexans SA
Original Assignee
Nexans 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
Application filed by Nexans SA filed Critical Nexans SA
Publication of EP0930804A2 publication Critical patent/EP0930804A2/fr
Publication of EP0930804A3 publication Critical patent/EP0930804A3/fr
Application granted granted Critical
Publication of EP0930804B1 publication Critical patent/EP0930804B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables

Definitions

  • the present invention relates to electrical cables and in particular to heating cables having at least one insulated wire conductor - such as a resistance wire terminated with 'cold' wire ends - and at least one earthing conductor arranged within at least one common outer layer.
  • at least one insulated wire conductor - such as a resistance wire terminated with 'cold' wire ends - and at least one earthing conductor arranged within at least one common outer layer.
  • EP 0 098 253 describes a heating cable having at least two conductors extending longitudinally of each other in spaced relation. Each of the conductors has an insulating coating which completely covers the respective conductors except for apertures in the conductors which are spaced longitudinally thereof. The apertures are arranged alternately in the conductors which are surrounded by a continuous layer of relatively low and substantially temperature-independent resistivity. The plastic layer is in contact with the conductors through the apertures and an electrically insulation outer layer covers the plastic layer completely.
  • EP 0 609 771 describes an electrical heating cable where a resistance wire is covered with heat resistive polymer insulation and outer mechanically resistive layers.
  • EP 0 312 204 relates to a heater conduit having a hollow tube comprising a conductive polymeric material that exhibits PTC behaviour, and two electrodes positioned in electrical contact with the tube, preferably in a helical configuration.
  • the conduit can be heated by the passage of electrical current therethrough, and is preferably used to heat a fluid passing through the tube.
  • US 4,309,597 relates to a heating element for use in an electric blanket or the like including conductors spaced apart in a positive temperature coefficient (PTC) material which serves as a self-limiting heater.
  • the conductors are separated by a spacer which prevents the conductors from engaging each other when the PTC material softens or melts during annealing thereof.
  • a coating of material having a higher melting point than the PTC material is placed over the PTC material to maintain its shape during the annealing process.
  • a constant objective with heating cables is reduction of production cost and improvement of the product design.
  • the main features of the invention are defined in the claims.
  • the basic idea is to combine the metallic sheath/screen and outer sheath in one semi-conductive layer.
  • the semiconductive material should have a conductivity/resistivity corresponding to that of conventional shields, i e with a volume resistivity ⁇ 100 ohmcm at 20°C and ⁇ 1000 ohncm at 90°C taken together with an earthing conductor having a conductivity corresponding to at least 1 mm 2 Cu.
  • the material need not have any particular PTC or NTC properties. Advantages are cost reduction, process simplification, design improvement (thinner) and handling improvement (lighter).
  • All embodiments have at least one conventional wire conductor such as a resistance wire which is terminated with 'cold' leads i e copper wire installation ends. Each conductor is covered by a layer of insulation material.
  • Figures 1-7 illustrate crossections of single conductor cables, - whereas Figures 8 to 13 illustrate crossections of two-conductor cables.
  • the semiconductive, polymer material may as base polymer material consist of:
  • the insulation polymer material (compound) may as base polymer material consist of:
  • the outer, protective layer polymer material (compound) may as base polymer material consist of :
  • the layers may consist of one single layer or two or more layers based on the same polymer, or a combination of the different polymers.
  • the compounds not being flame retardant may be made flame retardant by either halogenated or by so called halogen-free additives/systems.
  • Different colours may be achieved by adding necessary amount of colour masterbatch to the compound in the extruder process. There may be one single colour or different colours, as two or several stripes longitudinally.

Landscapes

  • Insulated Conductors (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Resistance Heating (AREA)

Claims (14)

  1. Câble électrique chauffant ayant au moins un fil conducteur isolé (1), une couche semi-conductrice (4), au moins un conducteur de mise à la masse (3) agencé dans ou en contact avec ladite couche semi-conductrice (4),
    caractérisé en ce que
    ledit fil conducteur (1) est recouvert par une couche extrudée de matériau d'isolation polymère située au-dessous de ladite couche semi-conductrice (4).
  2. Câble selon la revendication 1, caractérisé en ce que la conductivité/résistivité de la couche semi-conductrice est typiquement < 100 ohm.cm à 20°C et < 1000 ohm.cm à 90°C conjointement avec un conducteur de mise à la masse ayant une conductivité correspondant à au moins 1 mm2 Cu.
  3. Câble selon la revendication 1 ou 2, caractérisé en ce que ledit conducteur de mise à la masse (3) - tel qu'un conducteur en cuivre - est enroulé autour de ou en parallèle à ladite couche d'isolation et incorporé dans ladite couche semi-conductrice (4) qui est extrudée.
  4. Câble selon la revendication 1 ou 2, caractérisé en ce qu'il comprend une couche complète de conducteurs de mise à la masse (5) - tels que des conducteurs en cuivre - enroulés autour de ou en parallèle à ladite couche d'isolation et incorporés dans ladite couche semi-conductrice (4) qui est extrudée.
  5. Câble selon la revendication 3 ou 4, caractérisé en ce qu'il comprend une couche d'isolation protectrice externe (6).
  6. Câble selon la revendication 1 ou 2, caractérisé en ce que ledit conducteur de mise à la masse (3) - tel qu'un conducteur en cuivre - est enroulé autour de ou en parallèle à et en contact avec ladite couche semi-conductrice extrudée (4) et est incorporé dans une couche d'isolation protectrice externe (6).
  7. Câble selon la revendication 1 ou 2, caractérisé en ce qu'il comprend une couche complète de conducteurs de mise à la masse (5) - tels que des conducteurs en cuivre - enroulés autour de ou en parallèle à et en contact avec ladite couche semi-conductrice extrudée (4) et incorporés dans une couche d'isolation protectrice externe (6).
  8. Câble selon la revendication 1 ou 2, caractérisé en ce qu'il comprend deux fils conducteurs (20) chacun avec une couche extrudée individuelle de matériau d'isolation polymère (21), ledit conducteur de mise à la masse - tel qu'un conducteur en cuivre - étant agencé en parallèle aux fils conducteurs isolés (20, 21), ladite couche semi-conductrice extrudée (24) recouvrant les trois conducteurs.
  9. Câble selon la revendication 1 ou 2, caractérisé en ce qu'il comprend deux fils conducteurs (20) chacun avec une couche extrudée de matériau d'isolation polymère (21), une couche complète de conducteurs de mise à la masse (23) - tels que des conducteurs en cuivre - agencés autour ou en parallèle aux couches d'isolation (21), ladite couche semi-conductrice extrudée (24) recouvrant les conducteurs isolés (20, 21) et la couche de mise à la masse (23).
  10. Câble selon la revendication 8 ou 9, caractérisé en ce que les conducteurs - et l'agencement de mise à la masse - ont une configuration toronnée/parallèle.
  11. Câble selon la revendication 8, 9 ou 10, caractérisé en ce qu'il comprend une couche d'isolation protectrice externe (25).
  12. Câble selon la revendication 1 ou 2, caractérisé en ce qu'il comprend deux fils conducteurs (20,) chacun avec une couche extrudée (21) de matériau d'isolation polymère, ladite couche extrudée (24) de matériau semi-conducteur sur les deux conducteurs isolés (20, 21), ledit conducteur de mise à la masse (22) - tel qu'un conducteur en cuivre - enroulé autour ou en parallèle à et en contact avec la couche semi-conductrice (24) et une couche d'isolation protectrice externe (25) incorporant le conducteur de mise à la masse (22).
  13. Câble selon la revendication 1 ou 2, caractérisé en ce qu'il comprend deux fils conducteurs (20) chacun avec une couche extrudée (21) de matériau d'isolation polymère, ladite couche extrudée (24) de matériau semi-conducteur sur la couche d'isolation (21), une couche complète de conducteurs de mise à la masse (23) - tels que des conducteurs en cuivre - enroulés autour de ou en parallèle à et en contact avec la couche semi-conductrice (24) et une couche d'isolation protectrice externe (25) incorporant la couche de conducteurs de mise à la masse (23).
  14. Câble selon la revendication 1 ou 2, caractérisé en ce que ledit conducteur de mise à la masse (10) - tel qu'un conducteur de cuivre - est recouvert avec une couche semi-conductrice extrudée (11) et est en parallèle à ou enroulé autour du conducteur isolé (1, 2) un blindage en métal (12) recouvrant le conducteur isolé (1, 2) et la couche de mise à la masse (11) en contact avec la couche de mise à la masse et une couche d'isolation protectrice externe (13).
EP98403315A 1998-01-16 1998-12-28 Câble chauffant Expired - Lifetime EP0930804B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO980202A NO307020B1 (no) 1998-01-16 1998-01-16 Varmekabel
NO980202 1998-01-16

Publications (3)

Publication Number Publication Date
EP0930804A2 EP0930804A2 (fr) 1999-07-21
EP0930804A3 EP0930804A3 (fr) 2000-03-01
EP0930804B1 true EP0930804B1 (fr) 2007-02-14

Family

ID=19901561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98403315A Expired - Lifetime EP0930804B1 (fr) 1998-01-16 1998-12-28 Câble chauffant

Country Status (4)

Country Link
EP (1) EP0930804B1 (fr)
DE (1) DE69837080T2 (fr)
DK (1) DK0930804T3 (fr)
NO (1) NO307020B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6288372B1 (en) 1999-11-03 2001-09-11 Tyco Electronics Corporation Electric cable having braidless polymeric ground plane providing fault detection
DE10055141C5 (de) * 2000-11-07 2010-07-22 I.G. Bauerhin Gmbh Elektrotechnische Fabrik Heizleiter
NO321923B1 (no) * 2004-12-27 2006-07-24 Nexans Varmekabel
EP4216236A3 (fr) 2017-02-01 2023-11-01 Nvent Services Gmbh Câble chauffant autorégulateur à faible dégagement de fumée et sans halogène

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4246468A (en) * 1978-01-30 1981-01-20 Raychem Corporation Electrical devices containing PTC elements
US4200973A (en) * 1978-08-10 1980-05-06 Samuel Moore And Company Method of making self-temperature regulating electrical heating cable
FR2519505A1 (fr) * 1981-12-31 1983-07-08 Thomson Jeumont Cables Cable chauffant et son procede de fabrication
US5558794A (en) * 1991-08-02 1996-09-24 Jansens; Peter J. Coaxial heating cable with ground shield

Also Published As

Publication number Publication date
EP0930804A3 (fr) 2000-03-01
NO980202D0 (no) 1998-01-16
EP0930804A2 (fr) 1999-07-21
DE69837080D1 (de) 2007-03-29
NO307020B1 (no) 2000-01-24
DK0930804T3 (da) 2007-06-11
NO980202L (no) 1999-07-19
DE69837080T2 (de) 2007-10-31

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