EP0212832A2 - Verfahren zum Verbinden oder zum Abschliessen von elektrischen Kabeln - Google Patents

Verfahren zum Verbinden oder zum Abschliessen von elektrischen Kabeln Download PDF

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Publication number
EP0212832A2
EP0212832A2 EP86305370A EP86305370A EP0212832A2 EP 0212832 A2 EP0212832 A2 EP 0212832A2 EP 86305370 A EP86305370 A EP 86305370A EP 86305370 A EP86305370 A EP 86305370A EP 0212832 A2 EP0212832 A2 EP 0212832A2
Authority
EP
European Patent Office
Prior art keywords
layer
semi
conducting
extruded
over
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.)
Granted
Application number
EP86305370A
Other languages
English (en)
French (fr)
Other versions
EP0212832B1 (de
EP0212832A3 (en
Inventor
Edmund Hugh Ball
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.)
Prysmian Cables and Systems Ltd
Original Assignee
Prysmian Cables and Systems Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10583522&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0212832(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Prysmian Cables and Systems Ltd filed Critical Prysmian Cables and Systems Ltd
Priority to AT86305370T priority Critical patent/ATE72497T1/de
Publication of EP0212832A2 publication Critical patent/EP0212832A2/de
Publication of EP0212832A3 publication Critical patent/EP0212832A3/en
Application granted granted Critical
Publication of EP0212832B1 publication Critical patent/EP0212832B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

Definitions

  • This invention relates to electric cables, and more particularly to electric cables in which the current carrying conductors are provided with extruded polymeric insulating layers.
  • a layer of polymeric insulation is disposed over the conductor with a first semi-conducting layer between the conductor and insulation and a second semi-conducting layer over the insulation, and a conducting sheath is provided over the second semi-conducting layer to provide an earth screen. It is conventional to coextrude the semi-conducting layers with the insulating layer whereby the semi-conducting layers are bonded to the insulating layer.
  • the purpose of the semi- conducting layer is to prevent electrical discharges occurring due to voids being present between the inner surface of the insulating layer and the conductor and between the outer surface of the insulating layer and the conducting sheath.
  • the semi-conducting layer over the insulating layer has to be removed during jointing or termination of the cable in the region of the joint or termination as it normally has a resistance such that it would carry unacceptable high currents if it were allowed to form a path between the current carrying conductor and earth in the joint or termination. Removal of the semi-conducting layer over the insulating layer therefrom is a difficult operation which involves the risk of damage being caused to the insulation layer.
  • the present invention seeks an alternative solution in which the semi-conducting layer over the insulating layer is replaced by an alternative layer which can be readily extruded over the insulating layer but which does not have to be removed during jointing or terminating.
  • the present invention provides an electric cable having at least one current carrying conductor provided with an extruded polymeric insulating layer, over the whole length of which is an extruded layer of material having a relative permittivity of at least 15, said latter layer being covered with semi-conducting tape in contact therewith.
  • the embodiment comprises a high voltage electric cable with a single current carrying conductor.
  • a layer of semi-conducting material is extruded over the conductor.
  • a layer of polymeric insulating material is extruded over the layer of semi-conducting material and a layer of high permittivity material, that is a material with a relative permittivity of at least 15 and preferably for example 20 to 30, or even more, is extruded over the layer of insulating material. All three extruded layers extend the whole length of the conductor and the insulating layer is bonded to the layers on each side of it. The three layers may be co-extruded or extruded in separate operations on the cable length.
  • the high permittivity layer is covered with semi-conducting tape which is lapped or longitudinally wrapped around the high permittivity layer in contact with the outer surface thereof.
  • the semi-conducting tape may include a dessicant. Whilst it is preferable that the entire surface of the high permittivity layer be contacted by the semi-conducting tape small breaks in such contact will not give rise to electrical discharges because of the high permittivity of the layer.
  • a conventional metallic earth screen is provided over the semi-conducting tape.
  • the semi-conducting tape over the high permittivity layer is stripped back by simple unwinding or unwrapping thereof to the termination of the earth screen, but since the high permittivity layer will carry negligible current if left in a position at a joint or termination, it does not have to be stripped from the insulation layer. This not only simplifies jointing and terminating operations and eliminates the possibility of damage to the insulation layer's outer surface but also assists stress distribution within the joint or termination as the high permittivity layer tends to reduce the surface gradient at the earth screen termination.
  • An example of a suitable high permittivity material is nitrile rubber containing anatase.

Landscapes

  • Insulated Conductors (AREA)
  • Resistance Heating (AREA)
  • Cable Accessories (AREA)
  • Organic Insulating Materials (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Laminated Bodies (AREA)
  • Processing Of Terminals (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP86305370A 1985-08-08 1986-07-14 Verfahren zum Verbinden oder zum Abschliessen von elektrischen Kabeln Expired - Lifetime EP0212832B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86305370T ATE72497T1 (de) 1985-08-08 1986-07-14 Verfahren zum verbinden oder zum abschliessen von elektrischen kabeln.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8519967 1985-08-08
GB08519967A GB2179196B (en) 1985-08-08 1985-08-08 Electric cables

Publications (3)

Publication Number Publication Date
EP0212832A2 true EP0212832A2 (de) 1987-03-04
EP0212832A3 EP0212832A3 (en) 1988-12-28
EP0212832B1 EP0212832B1 (de) 1992-02-05

Family

ID=10583522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86305370A Expired - Lifetime EP0212832B1 (de) 1985-08-08 1986-07-14 Verfahren zum Verbinden oder zum Abschliessen von elektrischen Kabeln

Country Status (10)

Country Link
EP (1) EP0212832B1 (de)
AT (1) ATE72497T1 (de)
AU (1) AU582259B2 (de)
BR (1) BR8603745A (de)
CA (1) CA1266102A (de)
DE (1) DE3683813D1 (de)
DK (1) DK360386A (de)
ES (1) ES2000395A6 (de)
GB (1) GB2179196B (de)
NO (1) NO863120L (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828115A (en) * 1973-07-27 1974-08-06 Kerite Co High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof
US3885085A (en) * 1974-06-11 1975-05-20 Gen Cable Corp High voltage solid extruded insulated power cables
GB2095024A (en) * 1981-03-16 1982-09-22 Hubbell Inc Harvey Insulated high voltage cables
EP0076579A1 (de) * 1981-10-07 1983-04-13 Cable Technology Laboratories, Inc. Abschirmung der Isolierung für Hochspannungskabel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA734019B (en) * 1972-06-29 1974-05-29 Pirelli General Cable Works High voltage electric cables
AU5323586A (en) * 1985-02-06 1986-08-14 Raychem Corporation High frequency attenuation cable
AU5323686A (en) * 1985-02-06 1986-08-14 Raychem Corporation High frequency attenuation cable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828115A (en) * 1973-07-27 1974-08-06 Kerite Co High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof
US3885085A (en) * 1974-06-11 1975-05-20 Gen Cable Corp High voltage solid extruded insulated power cables
GB2095024A (en) * 1981-03-16 1982-09-22 Hubbell Inc Harvey Insulated high voltage cables
EP0076579A1 (de) * 1981-10-07 1983-04-13 Cable Technology Laboratories, Inc. Abschirmung der Isolierung für Hochspannungskabel

Also Published As

Publication number Publication date
DE3683813D1 (de) 1992-03-19
GB2179196A (en) 1987-02-25
NO863120L (no) 1987-02-09
EP0212832B1 (de) 1992-02-05
DK360386A (da) 1987-02-09
ES2000395A6 (es) 1988-02-16
CA1266102A (en) 1990-02-20
AU6075586A (en) 1987-02-12
GB8519967D0 (en) 1985-09-18
ATE72497T1 (de) 1992-02-15
AU582259B2 (en) 1989-03-16
DK360386D0 (da) 1986-07-29
GB2179196B (en) 1989-01-11
NO863120D0 (no) 1986-08-01
EP0212832A3 (en) 1988-12-28
BR8603745A (pt) 1987-03-10

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