EP2117016A1 - Zugstangenmontageanordnung für eine Hochspannungsbuchse, Hochspannungsbuchse mit einer derartigen Anordnung und Hochspannungsvorrichtung mit einer Buchse mit einer derartigen Anordnung - Google Patents

Zugstangenmontageanordnung für eine Hochspannungsbuchse, Hochspannungsbuchse mit einer derartigen Anordnung und Hochspannungsvorrichtung mit einer Buchse mit einer derartigen Anordnung Download PDF

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Publication number
EP2117016A1
EP2117016A1 EP08155702A EP08155702A EP2117016A1 EP 2117016 A1 EP2117016 A1 EP 2117016A1 EP 08155702 A EP08155702 A EP 08155702A EP 08155702 A EP08155702 A EP 08155702A EP 2117016 A1 EP2117016 A1 EP 2117016A1
Authority
EP
European Patent Office
Prior art keywords
draw rod
bushing
high voltage
conductor
arrangement
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Withdrawn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
EP08155702A
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English (en)
French (fr)
Inventor
David Emilsson
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.)
ABB Technology AG
Original Assignee
ABB Technology AG
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 AG filed Critical ABB Technology AG
Priority to EP08155702A priority Critical patent/EP2117016A1/de
Priority to CN2008101112371A priority patent/CN101577155B/zh
Priority to PCT/EP2009/054129 priority patent/WO2009135741A1/en
Priority to BRPI0912208A priority patent/BRPI0912208A2/pt
Publication of EP2117016A1 publication Critical patent/EP2117016A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H01B17/28—Capacitor type
    • 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
    • H01B17/30—Sealing

Definitions

  • the present invention relates to the field of high voltage power systems, and in particular to high voltage bushings used in high voltage devices forming parts of such systems.
  • high voltage equipment and devices e.g. high voltage transformers, reactors, switchgear etc.
  • a grounded barrier e.g. a wall or an enclosure of the electric device, such as a transformer tank.
  • Conventional high voltage bushings comprise an insulator made of ceramic or composite material, which is provided with sheds and which is generally hollow.
  • voltage grading is performed by a condenser body or some other type of voltage grading device, through which an electrical conductor passes.
  • the electrical conductor connects one side of the bushing, where a high voltage electric device is connected, with the other side of the bushing where another electric device is connected.
  • the first electric device is a transformer
  • the bushing is fitted on the transformer enclosure, such as the tank wall, and the conductor of the bushing connects the inside of the transformer with the outside, where another electric device can be connected, e.g. a bus, surge arrester or DC valve.
  • FIG. 1 showing a schematic cross sectional view of a bushing 1 mounted in a wall 18, such as the tank wall, in the case of a transformer.
  • a high voltage conductor 10 runs through the center of a hollow bushing insulator 12 that forms a housing around the high voltage conductor.
  • a condenser core 14 is provided inside the insulator housing for voltage grading of voltage stress that is built up around the high voltage conductor 10.
  • a flange 16 is provided on the outside of the housing 12, by means of which the housing of the bushing is connected to ground, via the transformer tank wall 18.
  • Fig. 1 is also shown how the bottom end portion of the high voltage conductor 10 forms a bottom contact 20 that is arranged to be connected to the internal components of the transformer.
  • a mating internal contact 22 is provided inside the transformer.
  • An upper outer terminal 24 for the conductor 10 is provided at the upper end of the bushing, opposite the bottom contact 20 end.
  • the outer terminal 24 is electrically connected to the conductor 10 through an essentially planar interface, also forming a top cover of the bushing, in order to electrically connect the conductor and thus the transformer to an external source or device.
  • a draw rod system may be used for ensuring electrical connection between the bushing and the transformer.
  • This system requires a hollow conductor, with the inside of the conductor open towards the transformer oil inside the transformer. It is necessary to provide a seal inside the conductor in order for the transformer oil not to leak out to the surroundings, outside the transformer and outside the bushing.
  • a traditional way of sealing off the inside of the conductor towards the outside of the transformer, for example a valve hall, is to use an expander arrangement that is assembled inside the conductor in the field, after the draw rod system is assembled.
  • This expander arrangement has drawbacks in terms of the radial space it requires which entails a disadvantageous reduction in thickness of the conductor wall, and also in terms of fail-safe assembly work that is necessary at the site in the field.
  • the outer terminal has to be screwed into a steel draw ring or similar located inside the conductor.
  • This draw ring is in turn screwed into the conductor, thereby reducing the wall thickness of the conductor due to the necessary internal threads.
  • This draw ring arrangement also requires that a sealing is provided.
  • high voltage is conventionally used for voltages above approximately 50 kV.
  • the upper limit in commercial high voltage devices is generally 1100 kV, but higher voltages, such as 1200 kV or even more, are envisaged in the near future.
  • current levels are increasing and may be up to 4000-5000 A or even higher.
  • a draw rod arrangement for a hollow conductor in a high voltage bushing comprising a draw rod attachment part and an outer terminal attachment part, wherein the draw rod attachment part and the outer terminal part are made in one piece forming a combined mounting device.
  • This inventive draw rod arrangement has the advantage of combining the function of the draw ring and the draw rod mounting, whereby space is saved inside the conductor and also conductor material is saved thanks to less threads.
  • a further advantage is that the personnel at the mounting site does not have to be involved in assembly of mechanical parts, which leads to easier and more fail-safe assembly and cost saving.
  • the draw rod attachment part of the mounting device is provided with an axial hole, through which an end of a draw rod is inserted, that in the axial prolongation of the hole there is an inner bore with a larger diameter than the hole and into which bore a threaded end of the draw rod extends, that the draw rod is mounted by means of a fastening arrangement in the inner bore.
  • This fastening arrangement may comprise a washer arrangement resting against a bottom in the inner bore and a nut screwed onto the threaded end of the draw rod.
  • the inner bore extends through the outer terminal attachment part.
  • the outer terminal attachment part is provided with threaded holes adapted to receive screws for mounting an outer terminal contact.
  • At least one sealing means arranged between the conductor and the combined mounting device.
  • a sealing is used for example when there is a liquid inside an electric device onto which a bushing comprising the draw rod attachment is mounted, and it is desirable to prevent this liquid from leaking out of the electric device, via the conductor and the bushing. This is the case for a transformer filled with insulating oil, for example.
  • the invention may also have the feature that it comprises an end plug for mounting over the combined mounting device, inside an open end of the conductor.
  • This end plug also has a sealing function.
  • the draw rod arrangement according to the invention may also comprise at least one sealing means arranged between the inner bore and a part of the end plug that extends down into the inner bore. This sealing also prevents leakage of any insulating medium that can be present inside the conductor when it is used in a bushing in a transformer.
  • the outer terminal attachment part is provided with a second set of threaded holes
  • the end plug is provided with corresponding holes for mounting the end plug onto the outer terminal attachment part by means of screws inserted in said holes and screwed into the second set of holes in the outer terminal attachment part.
  • the end plug has also an additional set of holes adapted to receive screws for mounting an outer terminal contact.
  • a high voltage bushing comprising a hollow conductor, characterized in that it comprises a draw rod arrangement according to any one of the claims related to a draw rod arrangement.
  • the high voltage bushing may be characterized in that the combined mounting device is connected to the hollow conductor by being welded inside one end of the conductor of the bushing.
  • the high voltage bushing may be characterized in that the combined mounting device is connected to the hollow conductor by being screwed inside one end of the conductor of the bushing. In that case there is no need for welding.
  • a high voltage device comprising a bushing as defined in any one of the claims related to a bushing.
  • high voltage will be used for voltages of 50 kV and higher.
  • the present upper limit for commercial high voltage is 1100 kV, but it is foreseen that the invention can be used also for higher voltages, up to 1200 kV or even more.
  • the present invention will find its applicability from about 200 kV and upwards.
  • FIG. 2 An embodiment of a draw rod arrangement according to the present invention is shown in Fig. 2 , mounted in a conductor 38, for example in a high voltage bushing (not shown).
  • the arrangement comprises a draw rod attachment part 31, and an outer terminal attachment part 32, combined as a one piece element, in the following referred to as a combined mounting device 33.
  • the draw rod attachment part 31 will in the following be referred to as the draw rod part, and the outer terminal attachment part 32 will in the following be referred to as the terminal part.
  • the draw rod part 31 has a first bottom part 34 with a basic shape of a hollow cone, with the open cone bottom directed towards the inner parts of the hollow conductor 38.
  • the draw rod part 31 has a second upper part 36, basically ring shaped with a central axial hole 40 through which the draw rod 42 is inserted.
  • a second upper part 36 In the upper part 36, above the hole 40, there is an inner bore 44 with a diameter that is larger than the diameter of the hole 40, and this inner bore 44 extends also all the way through the terminal part 32, in prolongation of the hole 40.
  • the draw rod 42 is mounted by means of a fastening arrangement, such as a washer arrangement 46 or similar resting against the bottom of the inner bore 44, and a nut 48 screwed onto the threaded top end of the draw rod.
  • the terminal part 32 of the draw rod arrangement is essentially ring shaped with an inner bore 44 as described above.
  • threaded holes 50 In the upper end of the terminal part, there are arranged threaded holes 50, adapted to cooperate with screws for mounting an outer terminal contact (not shown).
  • the draw rod arrangement comprises an end plug 52, inserted in the open end of the conductor 38, and covering the mounting device 33.
  • the end plug is mounted to the upper end of the terminal part 32 by means of screws 54 inserted in wholes 56 in the end plug and screwed into corresponding threaded holes 58 arranged in the upper part of the terminal part 32.
  • the draw rod arrangement also comprises at least one sealing 60 between the end plug 52 and the inside of the bore 44. This sealing ensures that the inside of the conductor is sealed off from the outside of the conductor.
  • the conductor is generally open to the cooling medium inside the transformer, normally oil, and it is very important that oil cannot leak out through the end of the conductor, to the outside.
  • the seal can be provided by means of an annular sealing, such as an O-ring, mounted in a groove provided in a part of the end plug 52 that extends down into the inner bore 44 of the terminal part 32, or alternatively the groove can be provided in the wall of the bore.
  • an annular sealing such as an O-ring
  • the sealing e.g. provisions for more than one sealing. It should also be mentioned that there may be applications where the end plug and its sealing function is not needed.
  • the end plug In order for an outer terminal contact to be mounted at the end of the conductor, and screwed into the mounting holes 50 of the terminal part 32, as described above, the end plug must also have corresponding holes 51 for the screws to pass through. It may also be mentioned that, instead of fastening an outer terminal contact in the terminal part 32, an intermediate part may be arranged externally of the end plug and the outer terminal may be attached to this part.
  • the mounting device can either be screwed into the end of the conductor or welded. In the case of screwing, the mounting device is provided with external threads 59 for cooperation with corresponding internal threads in the wall of the end of the conductor.
  • An additional sealing must then be provided between the inside of the conductor and the draw rod arrangement.
  • Fig. 2 where a sealing 62 is shown.
  • This sealing is located in a groove provided between the end plug 52 and the terminal part 32.
  • the sealing has an annular shape, e.g. an O-ring, and is compressed so that it fills the groove all the way out to the conductor wall. Naturally there may be more than one sealing, if necessary. Also alternative locations are possible for this sealing, as long as it performs sealing between the inside of the conductor and the outside of the draw rod arrangement.
  • the described draw rod arrangement may be used in a bushing both for DC and AC applications.
  • a transformer may be a high voltage device in which the inventive draw rod arrangement and high voltage bushing are used.
  • inventive draw rod arrangement and high voltage bushing may also be used with other types of high voltage devices, such as reactors, breakers, generators, switchgear or any other suitable device finding an application in high voltage systems.
  • electric device and high voltage device should also be interpreted as including cables, buses, surge arrestors, DC valves etc., within the context of the present invention.
  • the inventive draw rod arrangement and bushing When the inventive draw rod arrangement and bushing is used in a transformer, oil is used as insulating medium inside the transformer and on the other side of the bushing the medium is air, for example in a HVDC valve hall.
  • This type of bushing is generally referred to as an air-oil or air-liquid bushing.
  • the draw rod arrangement and bushing according to the invention is suitable for use in many electric devices, irrespective of the media on the respective sides of the bushing, such as air-air (wall bushing), air-gas (gas switchgear), etc.
  • the present invention bears no restriction as to the choice of insulation medium inside the bushing. It may for example be gas, oil, gel, or combinations thereof.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Housings And Mounting Of Transformers (AREA)
EP08155702A 2008-05-06 2008-05-06 Zugstangenmontageanordnung für eine Hochspannungsbuchse, Hochspannungsbuchse mit einer derartigen Anordnung und Hochspannungsvorrichtung mit einer Buchse mit einer derartigen Anordnung Withdrawn EP2117016A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP08155702A EP2117016A1 (de) 2008-05-06 2008-05-06 Zugstangenmontageanordnung für eine Hochspannungsbuchse, Hochspannungsbuchse mit einer derartigen Anordnung und Hochspannungsvorrichtung mit einer Buchse mit einer derartigen Anordnung
CN2008101112371A CN101577155B (zh) 2008-05-06 2008-06-05 拉杆装置、高压套管以及高压设备
PCT/EP2009/054129 WO2009135741A1 (en) 2008-05-06 2009-04-07 Draw rod mounting arrangement for a high voltage bushing, high voltage bushing comprising such arrangement and high voltage device comprising bushing with such arrangement
BRPI0912208A BRPI0912208A2 (pt) 2008-05-06 2009-04-07 Conjunto de montagem de barra de tração para uma bucha de alta-tensão, bucha de alta-tensão compreendendo tal conjunto e dispositivo de alta-tensão compreendendo bucha com tal conjunto

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08155702A EP2117016A1 (de) 2008-05-06 2008-05-06 Zugstangenmontageanordnung für eine Hochspannungsbuchse, Hochspannungsbuchse mit einer derartigen Anordnung und Hochspannungsvorrichtung mit einer Buchse mit einer derartigen Anordnung

Publications (1)

Publication Number Publication Date
EP2117016A1 true EP2117016A1 (de) 2009-11-11

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Family Applications (1)

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EP08155702A Withdrawn EP2117016A1 (de) 2008-05-06 2008-05-06 Zugstangenmontageanordnung für eine Hochspannungsbuchse, Hochspannungsbuchse mit einer derartigen Anordnung und Hochspannungsvorrichtung mit einer Buchse mit einer derartigen Anordnung

Country Status (4)

Country Link
EP (1) EP2117016A1 (de)
CN (1) CN101577155B (de)
BR (1) BRPI0912208A2 (de)
WO (1) WO2009135741A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102355791A (zh) * 2011-09-28 2012-02-15 南京创能电力科技开发有限公司 等离子发生器阴阳极的绝缘连接装置
EP2455950A1 (de) * 2010-11-19 2012-05-23 ABB Technology Ltd Hochspannungsdurchführung mit verstärktem Leiter
EP2482290A1 (de) 2011-01-28 2012-08-01 ABB Technology Ltd Temperaturkompensierte Durchführungsanordung
CN108321741A (zh) * 2018-02-08 2018-07-24 西安交通大学 超/特高压气体绝缘穿墙套管中心载流导体拉撑结构及超/特高压气体绝缘穿墙套管
EP3826035A1 (de) * 2019-11-20 2021-05-26 ABB Power Grids Switzerland AG Zugstangenbuchse mit abgedichtetem unterem kontakt

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108666109B (zh) * 2018-05-24 2024-02-13 上泰电气有限公司 插接组件、变压器套管以及插接组件的使用方法
CN111667997B (zh) * 2020-05-20 2021-09-21 中国南方电网有限责任公司超高压输电公司检修试验中心 一种换流变网侧套管拉杆系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1967653A (en) * 1931-03-05 1934-07-24 Ohio Brass Co Bushing insulator
US6194986B1 (en) * 1998-11-03 2001-02-27 Lapp Insulator Company Quick bottom connection for a transformer bushing

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2881905Y (zh) * 2005-12-20 2007-03-21 苏州九正电工有限公司 用于390mw燃气轮发电机的出线套管
CN101136280A (zh) * 2006-08-31 2008-03-05 Abb技术有限公司 高压设备、高压套管以及装配所述设备的方法
CN201044192Y (zh) * 2007-05-09 2008-04-02 宁波三爱互感器有限公司 一种电力套管

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1967653A (en) * 1931-03-05 1934-07-24 Ohio Brass Co Bushing insulator
US6194986B1 (en) * 1998-11-03 2001-02-27 Lapp Insulator Company Quick bottom connection for a transformer bushing

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Supplementary Instructions for Installation of Draw Rod Bushings 115kV and Above With Glass Bowl Sight Glass; IL 44- 670A", 17 June 1998, ABB POWER T&D COMPANY INC.
ABB POWER T&D COMPANY INC.: "Supplementary Instructions for Installation of Draw Rod Bushings 115kV and Above With Glass Bowl Sight Glass; IL 44-670A", 17 June 1998, ABB, XP002498246 *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2563039C2 (ru) * 2010-11-19 2015-09-20 Абб Текнолоджи Аг Высоковольтный ввод с армированным проводником
EP2455950A1 (de) * 2010-11-19 2012-05-23 ABB Technology Ltd Hochspannungsdurchführung mit verstärktem Leiter
WO2012065862A1 (en) * 2010-11-19 2012-05-24 Abb Technology Ag High voltage bushing with reinforced conductor
US9218900B2 (en) 2010-11-19 2015-12-22 Abb Technology Ag High voltage bushing with reinforced conductor
US8748757B2 (en) 2011-01-28 2014-06-10 Abb Technology Ltd. Temperature compensated bushing design
CN103339693A (zh) * 2011-01-28 2013-10-02 Abb技术有限公司 温度补偿的套管设计
WO2012100883A1 (en) 2011-01-28 2012-08-02 Abb Technology Ltd Temperature compensated bushing design
EP2482290A1 (de) 2011-01-28 2012-08-01 ABB Technology Ltd Temperaturkompensierte Durchführungsanordung
CN103339693B (zh) * 2011-01-28 2016-03-30 Abb技术有限公司 温度补偿的套管
CN102355791A (zh) * 2011-09-28 2012-02-15 南京创能电力科技开发有限公司 等离子发生器阴阳极的绝缘连接装置
CN108321741A (zh) * 2018-02-08 2018-07-24 西安交通大学 超/特高压气体绝缘穿墙套管中心载流导体拉撑结构及超/特高压气体绝缘穿墙套管
EP3826035A1 (de) * 2019-11-20 2021-05-26 ABB Power Grids Switzerland AG Zugstangenbuchse mit abgedichtetem unterem kontakt
WO2021099535A1 (en) * 2019-11-20 2021-05-27 Abb Power Grids Switzerland Ag Draw-rod bushing with sealed bottom contact
CN114287045A (zh) * 2019-11-20 2022-04-05 日立能源瑞士股份公司 带密封底部触点的拉杆套管
CN114287045B (zh) * 2019-11-20 2024-02-09 日立能源有限公司 带密封底部触点的拉杆套管

Also Published As

Publication number Publication date
CN101577155B (zh) 2013-05-08
CN101577155A (zh) 2009-11-11
BRPI0912208A2 (pt) 2017-08-22
WO2009135741A1 (en) 2009-11-12

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