WO2009003816A1 - Raccord de câble à haute tension - Google Patents

Raccord de câble à haute tension Download PDF

Info

Publication number
WO2009003816A1
WO2009003816A1 PCT/EP2008/057355 EP2008057355W WO2009003816A1 WO 2009003816 A1 WO2009003816 A1 WO 2009003816A1 EP 2008057355 W EP2008057355 W EP 2008057355W WO 2009003816 A1 WO2009003816 A1 WO 2009003816A1
Authority
WO
WIPO (PCT)
Prior art keywords
high voltage
cable connection
voltage cable
insulator
connection according
Prior art date
Application number
PCT/EP2008/057355
Other languages
English (en)
Inventor
Tommy Larsson
Original Assignee
Abb Technology 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
Application filed by Abb Technology Ltd filed Critical Abb Technology Ltd
Publication of WO2009003816A1 publication Critical patent/WO2009003816A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
    • H02G15/22—Cable terminations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens

Definitions

  • the present invention relates generally to high voltage cable connection for connection of a high voltage cable to a high voltage oil immersed device containing insulating liquid.
  • High voltage electrical equipment and devices such as high voltage transformers, are usually equipped with bushings, which are suitable to carry current at high potential through a grounded barrier, e.g. a transformer tank or a wall.
  • a grounded barrier e.g. a transformer tank or a wall.
  • the present invention seeks to provide a high voltage cable connection which has good dielectric and thermal properties, which contains few parts and is easily adapted to different applications.
  • a cable connection as specified in claim 1 is provided.
  • the invention is based on the realization that a cable connection with a grounded shielding tube instead of a oil insulated cable box and complicated oil interface can be used in applications wherein part of the device is submerged in oil. This is the case in for example in connections to transformers, which are submerged in transformer oil in a transformer tank.
  • the cable connection can be made completely dry, i.e., it contains no oil. Also, it has been shown that the electric field pattern in the cable connection is almost identical for both AC and DC applications, making the connection device suitable for both AC and DC.
  • an insulating gas such as SF6 or N 2 or mixtures thereof, is used as insulating medium inside the part of the cable connection that is connected to the high voltage device. This provides good thermal properties due to the insulating gas and the open design allowing the gas to circulate inside the cable connection.
  • the invention makes it possible to use a conventional GIS cable termination.
  • An advantage is that a completely dry arrangement can be made with very few parts in a compact design.
  • Fig. 1 is a sectional view of a high voltage cable connection mounted to a high voltage device.
  • high voltage will be used for voltages of 50 kv and higher.
  • the upper limit in commercial high voltage devices is 800 kV but even higher voltages, such as 1000 kV or more, are built or envisaged in the near future.
  • the connection device comprises a high voltage conductor 2 that extends through the center of a hollow gas filled cable connection insulator 4a, 4b that forms a housing around the high voltage conductor.
  • the cable connection has two sides, a first side or air side outside the high voltage device to which the cable connection is mounted, and a second side or transformer side submerged in an insulating liquid in the high voltage device to which the cable connection is fitted, in the present example a transformer, generally- designated 20.
  • the transformer contains insulating liquid 22, such as transformer oil, which is enclosed by a tank, designated 24.
  • the air side of the transformer cable connection is mainly consisting of the high voltage conductor 2 and an air side insulator 4a separating the gas inside the cable connection from the surrounding air. Further, the transformer side of the cable connection is separated from the oil 22 in the transformer by a transformer side insulator 4b.
  • the insulator which is preferably made of a composite material, such as epoxy, but could also be made of porce- lain, thus comprises two portions: an air side insulator 4a on the air side of the cable connection and a transformer side insulator 4b on the transformer side of the cable connection.
  • a flange 6 is provided to electrically connect the housing of the cable connection to ground through the tank 24 of the transformer 20.
  • a so-called throat shield or voltage grading shield in the form of a concentric grounded tube 8 is provided inside the hollow cable connection insulator 4a, 4b around the portion of the cable connection going into the tank 24.
  • This shield 8 which is made of a suitable conductive material, such as aluminum, accomplishes grading of the electrical field in the connection device and is used instead of a condenser core.
  • the voltage grading shield 8 is surrounded by the insulating gas, such as SF6 or N 2 or mixtures thereof, which is provided in the space 10a inside of the air side insulator 4a and the space 10b inside of the transformer side insulator 4b. It is preferred that these two spaces 10a, 10b are in communication with each other to provide circulation of the insulating gas, thereby improving cooling of the transformer side of the cable connection 1.
  • the inside of the transformer side insulator 4b i.e., the surface of the transformer side insulator facing the insulation gas inside the insulator, may be covered with a dielectric material (not shown) with a relatively low resistivity, such as silicone rubber, composite material or varnish. Since the resistivity of silicone rubber is almost of the same order of magnitude as that of the oil inside the transformer, improved electric field distribution is obtained. This layer minimizes internal radial field stresses in the transformer side insulator 4b separating the gas in the cable connection 1 from the oil 22 in the transformer 20 and provides a smooth grading of the potential along the transformer side insulator 4b between the high voltage and the grounded flange 6 and increases thereby the dielectric strength of the insulator 4b.
  • a dielectric material not shown
  • a relatively low resistivity such as silicone rubber, composite material or varnish. Since the resistivity of silicone rubber is almost of the same order of magnitude as that of the oil inside the transformer, improved electric field distribution is obtained.
  • This layer minimizes internal radial field stresses in the transformer
  • the transformer side insulator 4b has an essentially frusto-conical shape. This could be supplemented by the thickness of the coating on the inside of the connection device or the thickness of the insulator 4b housing. In order to further improve the performance, the thickness of the coating can vary along the transformer side of cable connection.
  • a shielding ring 12 provided at the end of the transformer side of the cable connection and a corresponding barrier system 26 in the transformer connection can further enhance the performance.
  • the geometry of the transformer side insulator 4b is optimized. Also, in DC applications the geometry of the barrier system 26 in the transformer is taken into account when optimizing the cable connection.
  • the inventive cable connection has been described as an air-oil connection device, i.e., wherein the first side of the connection device is surrounded by air outside a transformer, for example. It is realized that this first side can be provided in other environments, such as in gas in a gas-oil connection device.
  • the transformer 20 has been described with a barrier 26. It is realized that this barrier is optional.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Cable Accessories (AREA)
  • Connector Housings Or Holding Contact Members (AREA)

Abstract

Le raccord de câble à haute tension (1) selon l'invention, destiné à un dispositif à haute tension contenant un liquide isolant, comprend un blindage de répartition de la tension (8), afin d'améliorer les performances et de faciliter la fabrication.
PCT/EP2008/057355 2007-07-05 2008-06-12 Raccord de câble à haute tension WO2009003816A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0701658-7 2007-07-05
SE0701658A SE531321C2 (sv) 2007-07-05 2007-07-05 Högspänningskabelanslutning

Publications (1)

Publication Number Publication Date
WO2009003816A1 true WO2009003816A1 (fr) 2009-01-08

Family

ID=39752128

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/057355 WO2009003816A1 (fr) 2007-07-05 2008-06-12 Raccord de câble à haute tension

Country Status (3)

Country Link
CN (1) CN101340074B (fr)
SE (1) SE531321C2 (fr)
WO (1) WO2009003816A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012004289A1 (fr) * 2010-07-08 2012-01-12 Abb Research Ltd Dispositif de blindage pour haute tension et système le comprenant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9912140B2 (en) 2014-02-19 2018-03-06 Abb Hv Cables (Switzerland) Gmbh Power cable termination device for gas-insulated switchgear
CN104319727A (zh) * 2014-11-14 2015-01-28 中科英华高技术股份有限公司 电缆连接装置及方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790842A (en) * 1955-10-03 1957-04-30 G & W Electric Speciality Co Insulator for high voltage cable terminator or bushing
US4159401A (en) * 1977-11-01 1979-06-26 Tokyo Shibaura Kenki K.K. Gas filled bushings with potential shields
US4584429A (en) * 1983-03-21 1986-04-22 Cooper Industries, Inc. Electrical assembly including a metal enclosure and a high voltage bushing
EP1577904A1 (fr) * 2004-03-15 2005-09-21 Abb Research Ltd. Traversée haute tension avec élément pour les contrôle du champ électrique
US6951987B1 (en) * 2003-01-31 2005-10-04 United States Of America As Represented By The Secretary Of The Navy High voltage bushing
WO2007078237A1 (fr) * 2005-12-30 2007-07-12 Abb Technology Ltd. Traversee haute tension et dispositif haute tension comprenant celle-ci

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5991614A (ja) * 1982-11-17 1984-05-26 三菱電機株式会社 ブツシング
CN1427423A (zh) * 2001-12-19 2003-07-02 孟繁恒 一种交流高压套管

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790842A (en) * 1955-10-03 1957-04-30 G & W Electric Speciality Co Insulator for high voltage cable terminator or bushing
US4159401A (en) * 1977-11-01 1979-06-26 Tokyo Shibaura Kenki K.K. Gas filled bushings with potential shields
US4584429A (en) * 1983-03-21 1986-04-22 Cooper Industries, Inc. Electrical assembly including a metal enclosure and a high voltage bushing
US6951987B1 (en) * 2003-01-31 2005-10-04 United States Of America As Represented By The Secretary Of The Navy High voltage bushing
EP1577904A1 (fr) * 2004-03-15 2005-09-21 Abb Research Ltd. Traversée haute tension avec élément pour les contrôle du champ électrique
WO2007078237A1 (fr) * 2005-12-30 2007-07-12 Abb Technology Ltd. Traversee haute tension et dispositif haute tension comprenant celle-ci

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012004289A1 (fr) * 2010-07-08 2012-01-12 Abb Research Ltd Dispositif de blindage pour haute tension et système le comprenant
US9167731B2 (en) 2010-07-08 2015-10-20 Abb Reasearch Ltd. High voltage shielding device and a system comprising the same

Also Published As

Publication number Publication date
SE531321C2 (sv) 2009-02-24
CN101340074A (zh) 2009-01-07
SE0701658L (sv) 2009-01-06
CN101340074B (zh) 2012-07-04

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