EP0001494A1 - Electric cables - Google Patents

Electric cables Download PDF

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Publication number
EP0001494A1
EP0001494A1 EP78300427A EP78300427A EP0001494A1 EP 0001494 A1 EP0001494 A1 EP 0001494A1 EP 78300427 A EP78300427 A EP 78300427A EP 78300427 A EP78300427 A EP 78300427A EP 0001494 A1 EP0001494 A1 EP 0001494A1
Authority
EP
European Patent Office
Prior art keywords
carbon atoms
benzene rings
electric cable
aryl alkane
tapes
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Withdrawn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
EP78300427A
Other languages
German (de)
English (en)
French (fr)
Inventor
Derek Reginald Edwards
Arthur Boardman
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 EP0001494A1 publication Critical patent/EP0001494A1/en
Withdrawn legal-status Critical Current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
    • H01B9/00—Power cables
    • H01B9/06—Gas-pressure cables; Oil-pressure cables; Cables for use in conduits under fluid pressure
    • H01B9/0611—Oil-pressure cables
    • 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
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
    • H01B3/22—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils hydrocarbons

Definitions

  • This invention relates to electric cables for service at very high voltages and incorporating alkene polymer film (especially polypropylene or high- density polyethylene) as part of the insulation.
  • alkene polymer film especially polypropylene or high- density polyethylene
  • Such film may, and preferably does, form part of a laminate having surface layers of cellulosic paper.
  • the invention is characterised by the use of an insulating liquid comprising an aryl alkane having at least two separate (uncondensed) benzene rings and from one to six aliphatic non-cyclic'carbon atoms per benzene ring, one or more of which carbon atoms may be present in one or more hydrocarbon substituents in one or both of the benzene rings, the benzene rings or two of them being separated by not more than two aliphatic carbon atoms.
  • an insulating liquid comprising an aryl alkane having at least two separate (uncondensed) benzene rings and from one to six aliphatic non-cyclic'carbon atoms per benzene ring, one or more of which carbon atoms may be present in one or more hydrocarbon substituents in one or both of the benzene rings, the benzene rings or two of them being separated by not more than two aliphatic carbon atoms.
  • the aryl alkane has a viscosity less than 57 centistokes at 20°C and less than 11 centistokes at 60°C.
  • the alkene polymer film it is very desirable, and may be essential if a sufficient control of swelling is to be obtained to allow winding and unwinding of the cable, for the alkene polymer film to be present solely as a laminate, preferably prestressed by extrusion bonding, having two layers of cellulosic paper forming the exposed surfaces of the laminate. This also assists in resisting degradation, if, under overvoltage conditions, electrical discharges should occur in the gaps between the edges of lapped tapes.
  • the aryl alkane (or a mixture of aryl alkanes) may be used as the sole impregnant, or may be mixed with other suitable impregnants.
  • they may be mixed with suitable mineral oils, preferably having a viscosity less than 57 centistokes at 20°C and less than 11 centistokes at 60°C, to reduce cost, or with diorganosiloxamer (silicone) oils, in accordance with our British patent no. 1515847, to improve swelling performance still further.
  • Aryl alkanes that are already commercially available include:
  • the alkene polymer film forms part of a laminate, it preferably constitutes at least half the thickness of the laminate, and the paper layers correspondingly not more than one quarter each.
  • the total thickness will usually be in the range 50-250 micrometres.
  • the paper layers are preferably of low density, to secure a low overall power factor and permittivity, but on the other hand, they should be of a fine and uniform structure with a high impermeability, preferably at least 10,000 Gurley seconds.
  • the dielectric may consist of laminate tape, or it may include also a layer or layers of paper tape.
  • Figure 1 is a cross-section of a cable
  • Figure 2 is an enlarged detail of part of the dielectric.
  • 1 indicates a steel tape helix defining a central oil duct within the metallic conductor 2.
  • a bronze binder tape 3 Over the conductor is applied a bronze binder tape 3 and a conductor screen 4 formed of tapes metallised and/or loaded with conductive material.
  • the dielectric is made up of: an inner layer 5 consisting of two paper tapes each 75 micrometres thick; a main body 6 and a thin outer layer 7 made up of two paper tapes each 100 micro-metres thick.
  • the cable is completed by a semiconductive dielectric screen 8, conductive bedding tape 9 (made of copper wires and textile threads or glass fibres woven together), lead or aluminium sheath 10, bronze tape 11 or other pressure resisting reinforcement and a plastics oversheath 12.
  • the dielectric is impregnated with 100% commercial PXE maintained at a minimum pressure of 20 kN/m 2 .
  • the main dielectric body is made up of three parts, 6a, 6b and 6c, each of which is made up of a large number of extrusion-bonded laminate tapes each comprising a polypropylene layer sandwiched between and bonded to two paper tapes.
  • the polypropylene layer is 50 micrometres thick and each paper layer 25 micrometres; in the middle part 6b the polypropylene layer 60 micrometres and each paper layer 30 micrometres; and in the outer part 6c the polypropylene layer 80 micrometres and each paper layer 40 micrometres.
  • the parts 6a and 6b each have a radial thickness of 5mm; the outer part may have a radial thickness of 5mm to give a voltage rating of 400kV, or of 14mm to give a voltage rating of 750V.
  • Figure 2 illustrates, for either of these cables, the layers of laminate tape, each tape comprising a centre layer 13 of polypropylene and outer layers 14 of paper. Butt spaces 15 between tape edges are filled with the PXE.
  • Cables in accordance with the invention are useful in transmitting electrical energy in bulk at very high voltages.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Organic Insulating Materials (AREA)
EP78300427A 1977-09-29 1978-09-28 Electric cables Withdrawn EP0001494A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4060877 1977-09-29
GB4060877 1977-09-29

Publications (1)

Publication Number Publication Date
EP0001494A1 true EP0001494A1 (en) 1979-04-18

Family

ID=10415736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300427A Withdrawn EP0001494A1 (en) 1977-09-29 1978-09-28 Electric cables

Country Status (4)

Country Link
EP (1) EP0001494A1 (it)
JP (1) JPS5457689A (it)
IT (1) IT1105990B (it)
NO (1) NO783289L (it)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485563A1 (fr) * 1980-06-30 1981-12-31 Nippon Petrochemicals Co Ltd Huile isolante du point de vue electrique et appareils electriques en contenant
DE3200954A1 (de) * 1981-01-16 1982-09-02 Società Cavi Pirelli S.p.A., 20123 Milano Mit einem isolierenden medium impraegniertes elektrisches stromkabel
EP0129755A1 (en) * 1983-06-09 1985-01-02 Toray Industries, Inc. Electric power cable
EP0144149A1 (en) * 1983-11-01 1985-06-12 Exxon Research And Engineering Company Dielectric fluid
US4602121A (en) * 1984-01-17 1986-07-22 Societa' Cavi Pirelli S.P.A. Oil-filled electric cable with alternate layers of plastic and paper tape insulation
EP0295924A1 (en) * 1987-06-18 1988-12-21 BICC Public Limited Company Insulating liquids and electric cables
EP0684614A1 (en) 1994-05-24 1995-11-29 PIRELLI CAVI S.p.A. High voltage cable
WO2022065843A1 (ko) 2020-09-25 2022-03-31 주식회사 엘지화학 생분해성 고흡수성 수지 및 이의 제조 방법

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993156A (en) * 1956-05-24 1961-07-18 Sprague Electric Co Capacitor dielectric
GB896066A (en) * 1959-08-21 1962-05-09 Anaconda Wire & Cable Co Improvements in insulating oils
US3077510A (en) * 1959-06-02 1963-02-12 Anaconda Wire & Cable Co High voltage power cable
FR1367017A (fr) * 1962-06-28 1964-07-17 Ethyl Corp Additif pour huiles et graisses industrielles
FR2257131A2 (it) * 1974-01-08 1975-08-01 British Insulated Callenders
FR2275860A1 (fr) * 1974-06-20 1976-01-16 Matsushita Electric Ind Co Ltd Dispositif electrique impregne d'huile
DE2540866A1 (de) * 1974-09-13 1976-03-25 British Insulated Callenders Elektrisches kabel fuer hoechstspannungen
FR2349929A1 (fr) * 1976-05-01 1977-11-25 Nippon Oil Co Ltd Compositions a base d'huile isolante electrique
FR2358237A1 (fr) * 1976-07-16 1978-02-10 British Petroleum Co Composition fluide dielectrique pour travailler un metal par un procede d'electro-erosion

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993156A (en) * 1956-05-24 1961-07-18 Sprague Electric Co Capacitor dielectric
US3077510A (en) * 1959-06-02 1963-02-12 Anaconda Wire & Cable Co High voltage power cable
GB896066A (en) * 1959-08-21 1962-05-09 Anaconda Wire & Cable Co Improvements in insulating oils
FR1367017A (fr) * 1962-06-28 1964-07-17 Ethyl Corp Additif pour huiles et graisses industrielles
FR2257131A2 (it) * 1974-01-08 1975-08-01 British Insulated Callenders
FR2275860A1 (fr) * 1974-06-20 1976-01-16 Matsushita Electric Ind Co Ltd Dispositif electrique impregne d'huile
DE2540866A1 (de) * 1974-09-13 1976-03-25 British Insulated Callenders Elektrisches kabel fuer hoechstspannungen
FR2349929A1 (fr) * 1976-05-01 1977-11-25 Nippon Oil Co Ltd Compositions a base d'huile isolante electrique
FR2358237A1 (fr) * 1976-07-16 1978-02-10 British Petroleum Co Composition fluide dielectrique pour travailler un metal par un procede d'electro-erosion

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485563A1 (fr) * 1980-06-30 1981-12-31 Nippon Petrochemicals Co Ltd Huile isolante du point de vue electrique et appareils electriques en contenant
DE3200954A1 (de) * 1981-01-16 1982-09-02 Società Cavi Pirelli S.p.A., 20123 Milano Mit einem isolierenden medium impraegniertes elektrisches stromkabel
US4556756A (en) * 1981-01-16 1985-12-03 Societa' Cavi Pirelli S.P.A. Electric power cable impregnated with insulating fluid
EP0129755A1 (en) * 1983-06-09 1985-01-02 Toray Industries, Inc. Electric power cable
EP0144149A1 (en) * 1983-11-01 1985-06-12 Exxon Research And Engineering Company Dielectric fluid
US4613923A (en) * 1983-11-01 1986-09-23 Exxon Research & Engineering Co. Dielectric fluid
US4602121A (en) * 1984-01-17 1986-07-22 Societa' Cavi Pirelli S.P.A. Oil-filled electric cable with alternate layers of plastic and paper tape insulation
EP0295924A1 (en) * 1987-06-18 1988-12-21 BICC Public Limited Company Insulating liquids and electric cables
US4967039A (en) * 1987-06-18 1990-10-30 Bicc Public Limited Company Insulating liquids and electric cables
EP0684614A1 (en) 1994-05-24 1995-11-29 PIRELLI CAVI S.p.A. High voltage cable
WO2022065843A1 (ko) 2020-09-25 2022-03-31 주식회사 엘지화학 생분해성 고흡수성 수지 및 이의 제조 방법

Also Published As

Publication number Publication date
IT1105990B (it) 1985-11-11
NO783289L (no) 1979-03-30
JPS5457689A (en) 1979-05-09
IT7851262A0 (it) 1978-09-27

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Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

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

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn
RIN1 Information on inventor provided before grant (corrected)

Inventor name: BOARDMAN, ARTHUR

Inventor name: EDWARDS, DEREK REGINALD