EP0089993B1 - Blindage metallique pour un cable de puissance - Google Patents

Blindage metallique pour un cable de puissance Download PDF

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Publication number
EP0089993B1
EP0089993B1 EP82902993A EP82902993A EP0089993B1 EP 0089993 B1 EP0089993 B1 EP 0089993B1 EP 82902993 A EP82902993 A EP 82902993A EP 82902993 A EP82902993 A EP 82902993A EP 0089993 B1 EP0089993 B1 EP 0089993B1
Authority
EP
European Patent Office
Prior art keywords
screen
cores
cable
ribbons
metal wire
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
Application number
EP82902993A
Other languages
German (de)
English (en)
Other versions
EP0089993A1 (fr
Inventor
Sven Gunnar Wretemark
Rune Nils Axelsson
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP0089993A1 publication Critical patent/EP0089993A1/fr
Application granted granted Critical
Publication of EP0089993B1 publication Critical patent/EP0089993B1/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
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/025—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of helicoidally wound wire-conductors

Definitions

  • the present invention relates to a metal wire screen for an electric power cable comprising a predetermined number of twisted cores, said screen being made up from a premanufactured sheet consisting of electrically conductive rubber or plastic material extruded around parallel metal wires disposed therein, said screen embracing collectively a predetermined number of mutually twisted cores whereby the metal wires of the metal wire screen are parallel to the insulated cable cores.
  • a power cable metal wire screen has the task of leading off the current passing through the insulation layers of the cable cores, and also to serve as a conductor for earth fault currents in operational disturbances such as dielectric breakdown in the cable insulation layers.
  • Such a screen usually consists of a plurality of metal wires or ribbons along the cable surface, but may also be a solid metal tube, e.g. of lead.
  • a metal wire screen e.g. built up from copper wires, generally has considerably less conductive area than the main or phase conductors in the cable. There are standards prescribing that the screening conductor shall have a given density or largest average opening in respect of the cable circumference. The number of wires in the screen will thus be minimized and the wire diameter relatively small, usually about 1 mm.
  • an electric power cable with a flexible screen of a conducting rubber composition is known.
  • the screen includes a number of metal wires which may be disposed parallel to the longitudinal axis of the power conductors.
  • the screen is preformed as ribbons which are applied to the power conductors.
  • One or more ribbons are disposed to individually or collectively embrace a plurality of said power conductors.
  • the above mentioned problem is solved according to the precharacterizing part of Claim 1 in that the metal wire screen is made up of a number of premanufactured ribbons from that sheet equal to the number of cores, these ribbons each engaging against the outer side of its respective twisted core and extending parallel to the centre line of its associated core.
  • a further embodiment consists therein, that the edges of each premanufactured ribbon are thickened.
  • Figure 1 is a perspective view of a power cable with a first embodiment of the metal wire screen in accordance with the invention
  • Figure 2 is a cross section of a power cable with a second embodiment of the metal wire screen in accordance with the invention.
  • FIG. 1 A perspective view of a power cable with three cores is illustrated in Figure 1, each of the cores containing a conductor 1, e.g. of copper or aluminium, on which a semiconductive layer 2, e.g. of conductive plastics, has been extruded.
  • An insulating layer 3 is extruded on said layer 2, and a second semiconductive layer 4, e.g. of conductive plastics, is extruded on the insulation layer 3.
  • the cross section of each core is sector-shaped, and the three cores are laid in relation to each other such that their cylindrical backs face outwards to provide a substantially circular cross- sectional shape for the collected cores. Round the collected and twisted cores there is a first embodiment of a metal wire screen.
  • the screen comprises a separate screening ribbon 8 for each core, i.e. three screening ribbons 8 in the present case.
  • These screening ribbons are manufactured beforehand and include a predetermined number of metal wires 7 arranged in parallel.
  • the screening ribbons 8 are laid out on the back of the respective core and extending along the respective twisted core. So as to give the screen wires 7 a well defined location and to retain them in this position during movements and bending of the cable, the wires 7 are bedded into the screening ribbons 8 which preferably are made of an electrically conductive material, e.g. an electrically conductive rubber or plastics material, which also protects the wires against corrosion.
  • the thickness of these ribbons 8 exceed by some tenths of a millimeter the thickness of the wires.
  • the three screening ribbons 8 are applied on the back of the respective core, the cable body built up in this way then being wound with a band 9, after which the cable body is provided with a jacket 6, e.g. of plastics.
  • FIG 2 there is shown an embodiment of a cable with cores having circular cross section, as is the case with small cable dimensions.
  • the cores shown in Figure 2 are otherwise built up in the same way as those in Figure 1, i.e. with a conductor 1, in order surrounded by a semiconductive layer 2, an insulating layer 3 and a further semiconductive layer 4.
  • the intermediate spaces between the cores must be filled out. This can be attained, for example, by the type of screening ribbon 8 shown in Figure 1, which has been thickened out along its edges in the manner shown in Figure 2.
  • the screening ribbons 8 shown in Figure 2 also include a predetermined number of screening wires 7, which have been embedded beforehand in a layer of material, e.g. conductive plastics or rubber.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)

Claims (2)

1. Blindage en fils métalliques pour un câble électrique de puissance comprenant un nombre prédéterminé d'âmes torsadées (1 ledit blindage étant réalisé à partir d'une feuille préfabriquée constituée d'un caoutchouc ou d'une matière plastique conduisant le courant électrique appliqué par extrusion autour de fils métalliques parallèles (7) disposés intérieurement, ledit blindage entourant de façon commune un nombre prédéterminé d'âmes mutuellement torsadées (1 de manière que les fils métalliques (7) du blindage de fils métalliques soient parallèles aux âmes de câble isolées, caractérisé en ce que le blindage en fils métalliques est constitué d'un nombre de rubans préfabriqués (8), à partir de ladite feuille, égal au nombre d'âmes, ces rubans (8) portant chacun contre la face extérieure de l'âme torsadée respective (1) et s'étendant parallèlement à l'axe central de cette âme associée (1).
2. Blindage selon la revendication 1, caractérisé en ce que les bords de chaque ruban préfabriqué sont surépaissis.
EP82902993A 1981-10-02 1982-09-22 Blindage metallique pour un cable de puissance Expired EP0089993B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8105835A SE455906B (sv) 1981-10-02 1981-10-02 Metallskerm for en starkstromskabel
SE8105835 1981-10-02

Publications (2)

Publication Number Publication Date
EP0089993A1 EP0089993A1 (fr) 1983-10-05
EP0089993B1 true EP0089993B1 (fr) 1985-08-21

Family

ID=20344692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82902993A Expired EP0089993B1 (fr) 1981-10-02 1982-09-22 Blindage metallique pour un cable de puissance

Country Status (10)

Country Link
EP (1) EP0089993B1 (fr)
JP (1) JPS58501647A (fr)
AU (1) AU551371B2 (fr)
BR (1) BR8207885A (fr)
DE (1) DE3265626D1 (fr)
DK (1) DK149375C (fr)
FI (1) FI72222C (fr)
IT (1) IT1152869B (fr)
SE (1) SE455906B (fr)
WO (1) WO1983001337A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19525422A1 (de) * 1995-07-12 1997-01-16 Siemens Ag Kabel mit einer aus Stahl bestehenden Umhüllung sowie Verfahren und Einrichtung zur Herstellung desselben

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2286827A (en) * 1940-09-24 1942-06-16 American Steel & Wire Co Electric cable and method of manufacture
GB647753A (en) * 1948-12-14 1950-12-20 Liverpool Electric Cable Compa Improvements in or relating to electric cables
DE824961C (de) * 1949-08-24 1951-12-17 Land Und Seekabelwerke A G Biegsames elektrisches Kabel
DE815500C (de) * 1949-08-24 1951-10-01 Land Und Seekabelwerke A G Elektrisch leitfaehiges Band
DE848376C (de) * 1950-04-23 1952-09-04 Land Und Seekabelwerke Ag Biegsames elektrisches Kabel
DE857512C (de) * 1951-03-13 1952-12-01 Felten & Guilleaume Carlswerk Elektrisch leitendes Band fuer die Kabeltechnik
JPS5333882B1 (fr) * 1968-02-02 1978-09-18
DE1902663B2 (de) * 1969-01-15 1973-03-01 Vereinigte Draht und Kabelwerke AG, 1000 Berlin und 4100 Duisburg, Compagnie Francaise Thomson Houston Hotch kiss Brandt, Paris Starkstromkabel mit konzentrischem schutzleiter und verfahren zu dessen herstellung
DE2045975A1 (de) * 1970-09-17 1972-03-23 Kabel Metallwerke Ghh Hochspannungskabel mit über dem Strahlungsschutz angeordneter Abschirmung
DE2247198A1 (de) * 1972-09-22 1974-03-28 Siemens Ag Mehradriges starkstromkabel mit einzeladerabschirmung
IT1067545B (it) * 1976-08-30 1985-03-16 Pirelli Cavi a isolante estruso con schermo concentrico pzerfezionato

Also Published As

Publication number Publication date
SE455906B (sv) 1988-08-15
IT8223574A0 (it) 1982-10-01
FI831690A0 (fi) 1983-05-13
IT1152869B (it) 1987-01-14
AU551371B2 (en) 1986-04-24
DK249283D0 (da) 1983-06-01
EP0089993A1 (fr) 1983-10-05
DE3265626D1 (en) 1985-09-26
SE8105835L (sv) 1983-04-03
DK249283A (da) 1983-06-01
AU8956782A (en) 1983-04-27
DK149375C (da) 1987-01-19
FI831690L (fi) 1983-05-13
JPH0241843B2 (fr) 1990-09-19
BR8207885A (pt) 1983-08-30
JPS58501647A (ja) 1983-09-29
FI72222C (sv) 1987-04-13
DK149375B (da) 1986-05-20
WO1983001337A1 (fr) 1983-04-14
FI72222B (fi) 1986-12-31

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