EP2993671A1 - Bague comportant un condensateur de classement de papier imprégné d'huile avec un système de soupape permettant de filtrer l'huile sans devoir la démonter - Google Patents

Bague comportant un condensateur de classement de papier imprégné d'huile avec un système de soupape permettant de filtrer l'huile sans devoir la démonter Download PDF

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Publication number
EP2993671A1
EP2993671A1 EP14183449.9A EP14183449A EP2993671A1 EP 2993671 A1 EP2993671 A1 EP 2993671A1 EP 14183449 A EP14183449 A EP 14183449A EP 2993671 A1 EP2993671 A1 EP 2993671A1
Authority
EP
European Patent Office
Prior art keywords
valve
bushing
oil
gap
exterior
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
EP14183449.9A
Other languages
German (de)
English (en)
Other versions
EP2993671B1 (fr
Inventor
Giovanni Testin
Gianmarco Battarino
Milorad SEHOVAC
Marco Pavone
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.)
General Electric Technology GmbH
Original Assignee
Alstom 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 Alstom Technology AG filed Critical Alstom Technology AG
Priority to EP14183449.9A priority Critical patent/EP2993671B1/fr
Priority to CN201510486141.3A priority patent/CN105390218A/zh
Publication of EP2993671A1 publication Critical patent/EP2993671A1/fr
Application granted granted Critical
Publication of EP2993671B1 publication Critical patent/EP2993671B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01B17/34—Insulators containing liquid, e.g. oil
    • 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
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

Definitions

  • the invention relates to bushings for high voltage and ultra-high voltage for direct current or alternated current for transmission systems, where the main insulator of the bushing, i.e. its grading capacitor, is based on the oil impregnated paper (OIP) technology.
  • OIP oil impregnated paper
  • Such a bushing comprises a central tube generally made of aluminium, covered by a solid cylinder manufactured by wound paper which includes several aluminium foils.
  • This solid cylinder component named grading capacitor is generally encased in a cylindrical body, named insulator, which realizes the external insulation system of the bushing.
  • a cylindrical gap is provided between the grading capacitor and the body, while an oil channel is realized inside the grading capacitor central tube.
  • the conductor carrying the current can be the central tube or an additional solid bar or tube coaxial with the grading capacitor.
  • the purity of the oil is not so critical as in ultra-high voltage direct current applications, but with the normal bushing arrangement there is no possibility to perform the oil filtering and treatment operation at site. If this operation is necessary, it is required to dismount the bushing from the equipment, for example an ultra-high voltage power transformer, and to send it to the bushing manufacturer facilities for reprocessing.
  • transformers contain a significant amount of oil
  • the oil filtering process requires a long time, and the maintenance of the bushing is subjected to the periodical maintenance of the oil of the transformer, without any possibility to plan it differently.
  • the invention relates to a bushing comprising a body which encloses a central straight conductor extending along a longitudinal direction and a grading capacitor made by oil impregnated paper surrounding the central conductor, with a gap between an exterior surface of the grading capacitor and an interior surface of the body to allow circulation of oil for cooling the bushing, a ring seal which surrounds the grading capacitor to form a barrier separating the gap into a first part and a second part which do not communicate directly one with the other, at least on valve system fixed to the body at the level of the ring seal and comprising :
  • the invention allows to extract the oil to an external treatment and filtering plant and to return it into the bushing after filtration. This can be performed not only during the installation phase, but also with the bushing installed on the transformer during normal maintenance operation with the transformer not energized.
  • the invention significantly reduces the time required for maintenance procedures, since the entire transformer is not involved in this operation. This results in a great reduction of the time required for filtering the oil of the bushing during the periodic maintenance, in addition to the efficient cooling of the conductor during normal operation of the bushing.
  • the invention also relates to a bushing such as defined above, wherein the valve system is integrated into a block comprising a first channel connecting the first part of the gap to the first valve which communicates with the exterior, a second channel connecting the second part to the second valve which communicates with the exterior, and a third channel connecting the first channel to the second channel and wherein the third valve is mounted to open or close the third channel.
  • the invention also relates to a bushing such as defined above, comprising several blocks carried by the body and regularly spaced one from the other around the body, each block being at the level of the ring seal and comprising a valve system.
  • the invention is based on the idea of a valve system carried by the body of the bushing which on the basis of two different open-close configurations, allows the bushing oil filling under vacuum operation, the realization of appropriate circulation of the filtered oil during the filtering process, and the realization of the appropriate oil circulation for cooling during the bushing normal operation.
  • the bushing 1 according to the invention comprises an external body 2 generally cylindrical made of several parts 3, 4, 6, 7 connected to each other.
  • this external body or housing 2 which extends along a longitudinal direction AX, encloses a central straight conductor 8 such as a rod or a tube extending along direction AX and which is surrounded by a grading capacitor 9 which has a cylindrical shape and extends along direction AX.
  • This grading capacitor 9 is made by oil impregnated paper which is wound onto an internal metallic tube 10.
  • first gap 11 between the exterior surface of the central conductor 8 and the internal surface of the metallic tube 10
  • second gap 12 between the exterior surface of the grading capacitor 9 and the interior surface of the external body 2.
  • These two gaps 11 and 12 define a central cylindrical path and a peripheral cylindrical path which allow circulation of oil in two opposite directions, in order to cool the bushing during normal operation.
  • valve blocks 13, or valve systems are fixed to the housing to provide the ability to easily set up the oil circulation for filtering process or for normal operation of the bushing.
  • Each valve system 13, which is embedded into a metallic casing, comprises a first valve 14, a second valve 16 and a third valve 17.
  • the bushing comprises a ring seal 18 which surrounds the grading capacitor 9 at the level of the valve systems 13, and which forms a barrier to separate the cylindrical gap 12 into a first part 19 and a second part 21.
  • this ring seal 18 the first part 19 and the second part 21 are distinct and cannot communicate directly one with the other.
  • First valve 14 communicates with first part 19 by means of a first channel of the block and it communicates with the exterior plant: when this first valve 14 is opened as in fig. 2 , the first part 19 of gap 12 communicates with the exterior plant.
  • Second valve 16 communicates with second part 21 of gap 12 by means of a second channel of the block, and it communicates with the exterior: when the second valve is opened as in fig. 2 , the second part 21 of gap 12 communicates with the exterior of the bushing.
  • the third valve 17 is mounted onto a third channel of the block which is connected to the first and the second channel. In the closed position as in fig. 2 valve 17 does not allow oil to flow from the first to the second channel of the block.
  • the first and second valve 14 and 16 are open while the third valve 17 is closed, thus forcing the oil to flow in first part 19 of gap 12 towards a filtering plant, not visible on the figures and connected to the opened valve 14 by means of a flexible hose or pipe connecting the filtering plant to this first valve 14. Once this oil has been filtered in the plant, it is returned by another flexible hose or pipe to the second opened valve 16, to be transferred in the second part 21 of the gap 12.
  • the filtering of the oil does not require to dismount the bushing from the transformer since it can be performed directly at site by connecting the filtration and treatment plant to the first and second valves and to set up these valves appropriately.
  • the operator opens the third valve 17 and after that closes the first and second valves 14 and 16.
  • the third valve 17 acts as a bypass: the oil entering in first part 19 is blocked by the seal 18 and passes through first third and second channels of the block, reaching the second part 21 of the gap 12, which corresponds to normal operation of the bushing.
  • the valve blocks act as bypass to allow indirect communication between first and second part of the cylindrical gap.
  • valves blocks of the bushing according to the invention are easily accessible externally by the operators and reliable to guarantee proper oil circulation for the cooling of the bushing and proper oil circulation for filtering when requested by the maintenance operation.
  • the system guarantees optimal recirculation of the oil during the filtering process: no stagnant oil remains trapped in any part of the bushing.
  • the oil of the bushing is segregated from the oil of the transformer allowing to perform specific tests on the oil of the bushing such as dissolved gas analysis, particle counting, dielectric tests and moisture content to identify problems specifically in the bushing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Insulators (AREA)
  • Details Of Valves (AREA)
EP14183449.9A 2014-09-03 2014-09-03 Traversée comportant un condensateur de classement de papier imprégné d'huile avec un système de soupape permettant de filtrer l'huile sans devoir la démonter Active EP2993671B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14183449.9A EP2993671B1 (fr) 2014-09-03 2014-09-03 Traversée comportant un condensateur de classement de papier imprégné d'huile avec un système de soupape permettant de filtrer l'huile sans devoir la démonter
CN201510486141.3A CN105390218A (zh) 2014-09-03 2015-08-10 套管以及用于过滤和/或处理套管的油液的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14183449.9A EP2993671B1 (fr) 2014-09-03 2014-09-03 Traversée comportant un condensateur de classement de papier imprégné d'huile avec un système de soupape permettant de filtrer l'huile sans devoir la démonter

Publications (2)

Publication Number Publication Date
EP2993671A1 true EP2993671A1 (fr) 2016-03-09
EP2993671B1 EP2993671B1 (fr) 2017-05-17

Family

ID=51485489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14183449.9A Active EP2993671B1 (fr) 2014-09-03 2014-09-03 Traversée comportant un condensateur de classement de papier imprégné d'huile avec un système de soupape permettant de filtrer l'huile sans devoir la démonter

Country Status (2)

Country Link
EP (1) EP2993671B1 (fr)
CN (1) CN105390218A (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0078366A2 (fr) * 1981-11-03 1983-05-11 VEB Transformatorenwerk "Karl Liebknecht" Traversée à condensateur pour appareils électriques à haute tension
CN101950931A (zh) * 2010-08-25 2011-01-19 河南省电力公司郑州供电公司 变压器110kv电容式套管的现场除潮方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007056362A1 (de) * 2007-11-22 2009-05-28 Hydac Filtertechnik Gmbh Filtervorrichtung, insbesondere Rücklauf-Saugfilter, sowie Filterelement für eine solche Filtervorrichtung
CN201425868Y (zh) * 2009-04-15 2010-03-17 南京电气（集团）有限责任公司 一种油纸电容式套管
CN203224595U (zh) * 2013-04-19 2013-10-02 广东电网公司电力科学研究院 油纸电容式试验套管

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0078366A2 (fr) * 1981-11-03 1983-05-11 VEB Transformatorenwerk "Karl Liebknecht" Traversée à condensateur pour appareils électriques à haute tension
CN101950931A (zh) * 2010-08-25 2011-01-19 河南省电力公司郑州供电公司 变压器110kv电容式套管的现场除潮方法

Also Published As

Publication number Publication date
EP2993671B1 (fr) 2017-05-17
CN105390218A (zh) 2016-03-09

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