EP0987718A1 - Imprägnierzusammensetzung für elektrische Kabel - Google Patents

Imprägnierzusammensetzung für elektrische Kabel Download PDF

Info

Publication number
EP0987718A1
EP0987718A1 EP99401901A EP99401901A EP0987718A1 EP 0987718 A1 EP0987718 A1 EP 0987718A1 EP 99401901 A EP99401901 A EP 99401901A EP 99401901 A EP99401901 A EP 99401901A EP 0987718 A1 EP0987718 A1 EP 0987718A1
Authority
EP
European Patent Office
Prior art keywords
weight
compound
styrene
conductor
insulation
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Withdrawn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
EP99401901A
Other languages
English (en)
French (fr)
Inventor
Steinar Ouren
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
Alcatel CIT SA
Alcatel 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 Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Publication of EP0987718A1 publication Critical patent/EP0987718A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers

Definitions

  • the present invention relates to an impregnation compound for electrical cables, especially for high voltage DC power cables, with an insulation of a plurality of permeable tapes.
  • Such cables of the mass impregnated type i.e. metal sheathed cables insulated with paper which is impregnated with a viscous compound, are also designed for high voltage direct current (HVDC) transmission, underground as well as submarine.
  • HVDC high voltage direct current
  • an oil based electrical insulation compound comprising mineral oils and an oil soluble polymer being a synthetic hydrocarbonic block-copolymer of polystyrene and synthetic rubber having molecular weights from 50,000 - 1,000,000.
  • the parallel PCT WO97/04466 also describes an impregnating compound which has a very steep slope of change of viscosity characteristics, whereby the viscosity being high at temperatures equal and below the maximum cable operating temperature and being low at higher temperatures.
  • a second object of the present invention is to decrease the possibility of creation of voids in the compound during thermal cycling of the cable.
  • a further object of this invention is to reduce the impregnation temperature and in the following to shorten the manufacturing time and to save production costs.
  • the impregnating compound has a high nearly constant viscosity of 200 - 700 Pas up to an operating cable conductor temperature of at least 40°C and a low viscosity of less than 0.1 Pas in a temperature range of about 75° to 130°C.
  • the impregnating compound has a high nearly constant viscosity of 300 - 500 Pas up to an operating cable conductor temperature of 70°C and a low viscosity of less than 0.1 Pas in a temperature range of about 95° to 125°C.
  • the compound or impregnating mass according to the inventions consists of
  • the mineral oil in the compound according to this invention is preferably a hydrogenated naphthenic oil with a boiling point between 250 and 540°C with a viscosity at 40°C between 20 and 300 cSt and containing aromatic hydrocarbons in a range between 25 and 50 % by weight.
  • thermoplastic elastomer used according to the present invention is a styrene-ethylen-butylene-styrene (SEBS) elastomer with a molecular weight between 100,00 and 250,000 and a styrene content of 25 - 35 % mass.
  • SEBS styrene-ethylen-butylene-styrene
  • the present invention relates not only to the impregnating compound or mass described above but also to the cable with an insulation impregnated with this compound/mass.
  • the invention relates also to the method for making such cables. With the invention there is obtained a HVDC power cable having the properties mentioned above and extra high effect transfer capacity, in the order of 500 MW and above at a voltage of 350 kV and above.
  • FIG. 1 is schematically illustrated a HVDC power cable 1 comprising a central multiwire conductor 2 having a substantially circular cross section.
  • At least one insulation layer 3 which encompasses the conductor consists of a plurality of permeable paper tapes wound around the conductor.
  • At least one non-permeable sheath 4 having a substantially circular cross section encompasses the insulation layer(s) 3 and an impregnating compound substantially fill all interstices within the conductor, all interstices between individual tape layers and all voids within the tape structure itself.
  • Two or more insulated cores can be arranged within the same non-permeable sheath.
  • the electrical properties of the cable insulating system depend not only on the type of insulation and the cable manufacturing process, but especially on the choice of the impregnation compound.
  • Such a compound to be used for HVDC cables should have a low dielectric loss and the ability to absorb hydrogen gas when subjected to ionic bombardment and moreover it should have a long-term stability.
  • This compound is characterized by a low viscosity at 100 - 80°C, i.e. 40 m Pas at 100°C, and a nearly constant viscosity from 55 - 50 and down to 0°C. At 0°C this compound has a viscosity of 450 Pas.
  • This impregnating compound/mass has a low viscosity at 125 - 115°C and nearly a constant viscosity from 70 - 60 and down to 0°C.
  • the above mentioned impregnating compound E has a low viscosity at 100 - 80°C and a nearly constant viscosity from 50 - 40 and down to 0°C.
  • the typically Tan 6 is 0.070, the resistivity ⁇ 2 ⁇ 10 11 and the breakdown 60 kV.
  • the gas absorbing quality is high, it is typically 12 - 15 mm 3 /min.
  • the relatively constant viscosity of the impregnating mass at the working temperature of the cable decreases the possibility of the creation of voids or bubbles in a most effective way, also in the case of thermal cyclings of the cable.
  • the low viscosity before the gel-point reduces the impregnation temperature of the cable essentially and as a result the cable manufacturing time, that means especially the time for impregnation of the cable insulation, can be reduced.
  • the compound A has its low viscosity of about 0.05 Pas at about 90°C while the compound B, both regarding the invention, has its low viscosity also of about 0.05 Pas at about 110°C.
  • the slope of change or both essential viscosity characteristics (high/low) is steep.
  • the NH curve in the Fig. 2 describes another prior art (PCT/WO97/04465) which has a "high” viscosity at about 3,000 Pas and a "low” viscosity of about 0.05 Pas at a temperature of about 60°C. But the slope of change in this case is very steep, from its high level of viscosity the NH curve changes its gradient rapidly. So the compound according to the prior art will not perform the conditions which are necessary to acquire the advantages of the present invention.
EP99401901A 1998-09-14 1999-07-26 Imprägnierzusammensetzung für elektrische Kabel Withdrawn EP0987718A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO984234A NO984234L (no) 1998-09-14 1998-09-14 Impregneringsmateriale for elektriske kabler
NO984234 1998-09-14

Publications (1)

Publication Number Publication Date
EP0987718A1 true EP0987718A1 (de) 2000-03-22

Family

ID=19902405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99401901A Withdrawn EP0987718A1 (de) 1998-09-14 1999-07-26 Imprägnierzusammensetzung für elektrische Kabel

Country Status (3)

Country Link
EP (1) EP0987718A1 (de)
JP (1) JP2000090750A (de)
NO (1) NO984234L (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001093279A2 (en) * 2000-05-31 2001-12-06 Abb Ab Insulated electric cable
US6824870B2 (en) 2000-09-28 2004-11-30 Pirelli S.P.A. Cable with recyclable covering
US6908673B2 (en) 2000-06-28 2005-06-21 Pirelli Cavi E Sistemi S.P.A. Cable with recyclable covering
US7196270B2 (en) 2003-01-20 2007-03-27 Prysmian Cavi E Sistemi Energia S.R.L. Cable with recyclable covering layer
US7744950B2 (en) 2000-12-06 2010-06-29 Prysmian Cavi E Sistemi Energia S.R.L. Process for producing a cable with a recyclable coating comprising a thermoplastic polymer and a dielectric liquid
US7884284B2 (en) 2005-10-25 2011-02-08 Prysmian Cavi E Sistemi Energia S.R.L. Energy cable comprising a dielectric fluid and a mixture of thermoplastic polymers
US7999188B2 (en) 2007-06-28 2011-08-16 Prysmian S.P.A. Energy cable
EP3967721A1 (de) 2020-09-10 2022-03-16 Nexans Imprägnierflüssigkeit für hochspannungsstromkabel mit papierwicklung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100773695B1 (ko) 2007-02-02 2007-11-05 엘에스전선 주식회사 고전압 직류 케이블의 함침방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259540A (en) * 1978-05-30 1981-03-31 Bell Telephone Laboratories, Incorporated Filled cables
EP0170054A1 (de) * 1984-07-11 1986-02-05 Siemens Aktiengesellschaft Isolieröl für elektrische Geräte
WO1997004465A1 (en) * 1995-07-14 1997-02-06 Norsk Hydro A.S Electrical insulating oil based compound and its use

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259540A (en) * 1978-05-30 1981-03-31 Bell Telephone Laboratories, Incorporated Filled cables
EP0170054A1 (de) * 1984-07-11 1986-02-05 Siemens Aktiengesellschaft Isolieröl für elektrische Geräte
WO1997004465A1 (en) * 1995-07-14 1997-02-06 Norsk Hydro A.S Electrical insulating oil based compound and its use

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001093279A2 (en) * 2000-05-31 2001-12-06 Abb Ab Insulated electric cable
WO2001093279A3 (en) * 2000-05-31 2002-06-27 Abb Ab Insulated electric cable
US6908673B2 (en) 2000-06-28 2005-06-21 Pirelli Cavi E Sistemi S.P.A. Cable with recyclable covering
US6824870B2 (en) 2000-09-28 2004-11-30 Pirelli S.P.A. Cable with recyclable covering
US7744950B2 (en) 2000-12-06 2010-06-29 Prysmian Cavi E Sistemi Energia S.R.L. Process for producing a cable with a recyclable coating comprising a thermoplastic polymer and a dielectric liquid
US7196270B2 (en) 2003-01-20 2007-03-27 Prysmian Cavi E Sistemi Energia S.R.L. Cable with recyclable covering layer
US7884284B2 (en) 2005-10-25 2011-02-08 Prysmian Cavi E Sistemi Energia S.R.L. Energy cable comprising a dielectric fluid and a mixture of thermoplastic polymers
US7999188B2 (en) 2007-06-28 2011-08-16 Prysmian S.P.A. Energy cable
EP3967721A1 (de) 2020-09-10 2022-03-16 Nexans Imprägnierflüssigkeit für hochspannungsstromkabel mit papierwicklung

Also Published As

Publication number Publication date
JP2000090750A (ja) 2000-03-31
NO984234D0 (no) 1998-09-14
NO984234L (no) 2000-03-15

Similar Documents

Publication Publication Date Title
EP2512803B1 (de) Hochspannungsgleichstromkabel mit imprägnierter schichtisolierung
EP0987718A1 (de) Imprägnierzusammensetzung für elektrische Kabel
CA2685653C (en) Thermally enhanced power cable rejuvenation
CN103959400B (zh) 包括厚度受控的层压绝缘层的直流(dc)传输系统以及制造方法
CA1177922A (en) Submarine electric cable with improved voltage breakdown characteristics
KR101998944B1 (ko) 전력 케이블
US11488741B2 (en) Gel impregnated bushing
WO1997004466A1 (en) Power cable, manufacturing method and impregnating compound
EP0295924B1 (de) Isolier-Flüssigkeiten und elektrische Kabel
KR20010033370A (ko) 절연 전기 직류 케이블
EP3544035B1 (de) Reparatur der gel-isolierung von elektrischen vorrichtungen
WO1997004465A1 (en) Electrical insulating oil based compound and its use
JPH11224542A (ja) 架橋ポリエチレン絶縁電力ケーブル
KR20010033393A (ko) 유전체 겔화 혼합물, 그러한 유전체 겔화 혼합물을제조하는 방법 및 그러한 유전체 겔화 혼합물로 함침된절연 시스템을 구비하는 전기 직류 케이블
EP3544032A1 (de) Elektrische vorrichtung mit gelverbundisolierung
US3987239A (en) High voltage dc cables
JP3970369B2 (ja) 直流油浸電力ケーブル
Boone et al. The influence of fluorine atoms on the electric strength of liquids
RU21839U1 (ru) Электрический кабель (варианты) для кабельной линии установки, применяемой при добыче нефти
EP1297538A2 (de) Isoliertes elektrisches kabel
JP3909611B2 (ja) 油浸ソリッド電力ケーブル
JP2000268652A (ja) ソリッド電力ケーブルの製造方法
Umar Evaluation of 11kV XLPE Cable
JPH11329102A (ja) 油浸ソリッド電力ケーブル

Legal Events

Date Code Title Description
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

Kind code of ref document: A1

Designated state(s): DK GB IT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20000922

AKX Designation fees paid

Free format text: DK GB IT SE

REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NEXANS

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20030312