EP0150130A2 - Lastumschalter - Google Patents

Lastumschalter Download PDF

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Publication number
EP0150130A2
EP0150130A2 EP85300441A EP85300441A EP0150130A2 EP 0150130 A2 EP0150130 A2 EP 0150130A2 EP 85300441 A EP85300441 A EP 85300441A EP 85300441 A EP85300441 A EP 85300441A EP 0150130 A2 EP0150130 A2 EP 0150130A2
Authority
EP
European Patent Office
Prior art keywords
vessel
conduit
oil
tap changer
switch
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Withdrawn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
EP85300441A
Other languages
English (en)
French (fr)
Other versions
EP0150130A3 (de
Inventor
Kazuya Furukawa
Katsuji Sokai
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0150130A2 publication Critical patent/EP0150130A2/de
Publication of EP0150130A3 publication Critical patent/EP0150130A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H2009/0055—Oil filters for tap change devices

Definitions

  • This invention relates to an on-load tap changer, and more particularly, to an oil-filtering system for an oil-filled on-load tap changer.
  • a diverter switch of a conventional on-load tap changer is basically a switch for switching a load current of a transformer to a preselected tap by the tap selector at no current.
  • the diverter switch is enclosed within a vessel filled with an electrically insulating oil.
  • the insulating oil is gradually polluted and degraded as it is decomposed to form foreign matters such as carbon and sludge by the electric arc upon each tap change, thereby degrading the electrically insulating properties.
  • the on-load tap changer for use with a high-voltage transformer is provided with an oil filter unit, which is a kind of a filter with a pump in it, and the insulating oil is filtered through the oil filter unit once a day as is well known in the art.
  • the conduit connecting the vessel for the diverter switch and the oil filter unit is arranged such that polluted oil at the bottom of the vessel of the tap-changer is suctioned into the conduit and pumped through the filter element of the oil filter unit to return to the upper portion of the tap changer vessel.
  • the diverter switch is typically suspended from the top of the transformer tank, and the oil filter unit is positioned outside the transformer tank and placed on the same level as the transformer tank.
  • the suction conduit from which the oil enters for filtering is typically constructed and incorporated as one of the parts of the tap changer vessel, the conduit rises from the bottom portion of the vessel along its length and extends outwardly through the upper portion of the vessel which is secured to the top of the transformer tank.
  • the vessel is suspended from the top plate of the transformer tank, the vessel is usually positioned at a higher level than is the oil filter unit.
  • the conventional on-load tap changer as above constructed has the following disadvantages.
  • an object of the present invention is to provide an on-load tap changer which is free from the above-mentioned drawback.
  • Another object of the present invention is to provide an on-load tap changer which is free from the risk that most of the electrically insulating oil can flow out from the tap changer system.
  • a further object of the present invention is to provide an on-load tap changer which is free from the risk that the level of insulating oil can fall due to an oil leak, thus exposing the interrupting unit of the tap changer.
  • an on-load tap changer of the present invention comprises a switch such as a diverter switch or a selector switch including an arc interrupting unit, a vessel containing the switch, an electrically insulating oil disposed within said vessel, and a closed oil passage loop.
  • the oil passage loop includes an oil conduit having an opening at the bottom portion of the interior of the vessel, extending through the upper portion of the vessel, passing through a level lower than the vessel and connected to the top portion of the vessel.
  • the oil conduit has formed therein a small hole at a position higher than the interrupting unit, the hole being inside of the vessel.
  • the hole has a diameter sufficiently smaller than the inner diameter of the conduit for permitting most of the insulating oil supplied into the oil filter unit to be supplied from the inlet opening of the conduit at the bottom portion of the vessel rather than the upper portion of the vessel.
  • the tap changer 10 comprises a hermetic vessel 16 within which a changer-over switch 18 and an arc interrupter unit 20 are enclosed.
  • the vessel 16 has an upper portion 22 and a lower portion 24 in communication with each other.
  • the upper portion 22 of the vessel 16 is placed on the top plate 15 of the transformer housing 14 and the lower portion 24 of the vessel 16 is suspended into the interior of the transformer housing 14.
  • the diverter switch 18 and the current interrupting unit 20 are disposed within the lower portion 24 of the vessel 16. Therefore, although they are positioned within the transformer housing 14, they are isolated by the wall of the vessel 16 from the interior of the transformer housing 14.
  • the tap-changer vessel 16 is substantially filled with an electrically insulating oil 26 in order to promote the quick extinction of the arc generated during the tap changing.
  • a conservater 28 connected to a breezer 30 by a conduit 32 is connected to the upper portion 22 of the tap-changer vessel 16 through a conduit 34.
  • the tap changer 10 also comprises an oil filter unit 36 which includes a pump and a filter element. It is seen that the bottom wall of the oil filter unit 36 is positioned at the same level as the bottom wall of the transformer housing 14 and therefore the oil filter unit 36 is positioned at a lower level than the tap changer l0 which is positioned at the upper portion of the transformer housing 14.
  • the inlet of the oil filter unit 36 is connected to the bottom portion of the tap changer vessel 16 by a conduit 38 having an inlet 40 at the bottom portion inside the tap changer vessel 16.
  • the conduit 38 has the shape of an inverted "U". This is because the tap changer 10 is typically designed as an assembled unit with at least part of the conduit 38 incorporated into the vessel 16 and it is not desirable to design the walls of the vessel 16 and the transformer housing 14 to be penetrated by the conduit 38.
  • the outlet of the oil filter unit 36 is connected to the upper portion 22 of the tap changer vessel 16 through a second conduit 42.
  • a closed oil passage loop composed of the vessel 16, the inverted-U shaped conduit 38, the oil filter unit 36, and the second conduit 42 is formed.
  • the inverted U-shaped conduit 38 has formed therein a small air breezing hole 44 at its top portion.
  • the small hole 44 communicates the inside of the conduit 38 to the interior of the upper portion 22 of the tap changer vessel 16.
  • the small hole 44 is designed to exhibit a very high flow resistance against the insulating oil 26 flowing therethrough as compared to the flow resistance in the section of the conduit 38 between the inlet opening 40 and the small hole 44.
  • the small hole 44 has a very small diameter compared to the inside diameter of the conduit 38.
  • the pump (not shown) in the oil filter unit 36 is energized to suction the insulating oil 26 in the bottom portion of the tap changer vessel 16 from the inlet opening 40.
  • the small hole 44 formed in the wall of the conduit 38 is sufficiently small compared to the inside diameter of the conduit 38, the flow resistance of the small hole 44 is very high compared to the flow resistance of the flow path in the conduit 38 through the inlet opening 40. Therefore, most of the insulating oil 26 supplied into the oil filter unit 36 is supplied from the inlet opening 40 at the bottom of the tap changer vessel 16 rather than from the upper portion 22 of the vessel 16.
  • the oil 26 supplied through the conduit 38 to the oil filter unit 36 passes through the filter element (not shown) of the oil filter unit 36 to be cleaned.
  • the filtered oil 26 is returned to the upper portion 22 of the vessel 16 and descend to the bottom portion of the vessel 16.
  • the insulating oil 26 recirculates through the closed oil passage loop composed of the vessel 16, the first conduit 38, the oil filter unit 36, and the second conduit 42.
  • the insulating oil 26 within the tap changer vessel 16 flows out from the inlet opening 40 of the conduit 38 through the conduit 38 and from the leak in the oil filter unit 36. As the oil continues to leak, the insulating oil 26 is emptied first from the conservator 28, and then the level of the insulating oil 26 within the upper portion 22 of the tap changer vessel 16 gradually decreases.
  • the oil conduit has formed therein a small hole at a position higher than the interrupting unit, and the hole has a diameter sufficiently smaller than the inner diameter of the conduit. Therefore, the level of the insulating oil cannot become lower than the arc interrupting unit, preventing accidents such as short-circuit between taps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)
  • Housings And Mounting Of Transformers (AREA)
EP85300441A 1984-01-24 1985-01-23 Lastumschalter Withdrawn EP0150130A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP851684U JPS60119724U (ja) 1984-01-24 1984-01-24 負荷時タツプ切換装置
JP8516/84 1984-01-24

Publications (2)

Publication Number Publication Date
EP0150130A2 true EP0150130A2 (de) 1985-07-31
EP0150130A3 EP0150130A3 (de) 1986-01-29

Family

ID=11695303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85300441A Withdrawn EP0150130A3 (de) 1984-01-24 1985-01-23 Lastumschalter

Country Status (2)

Country Link
EP (1) EP0150130A3 (de)
JP (1) JPS60119724U (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104051136A (zh) * 2013-03-15 2014-09-17 叶松伟 内置式在线滤油有载分接开关
CN113909205A (zh) * 2021-11-15 2022-01-11 广西电网有限责任公司贵港供电局 一种有载分接开关超声波滤洗装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61141110A (ja) * 1984-12-14 1986-06-28 Toshiba Corp 負荷時タツプ切換器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1009319A (en) * 1963-08-19 1965-11-10 Shinji Nakazawa Conservator for oil-immersed transformers
DE3240724A1 (de) * 1981-11-05 1983-05-11 Mitsubishi Denki K.K., Tokyo Transformatoranordnung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1009319A (en) * 1963-08-19 1965-11-10 Shinji Nakazawa Conservator for oil-immersed transformers
DE3240724A1 (de) * 1981-11-05 1983-05-11 Mitsubishi Denki K.K., Tokyo Transformatoranordnung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104051136A (zh) * 2013-03-15 2014-09-17 叶松伟 内置式在线滤油有载分接开关
CN113909205A (zh) * 2021-11-15 2022-01-11 广西电网有限责任公司贵港供电局 一种有载分接开关超声波滤洗装置

Also Published As

Publication number Publication date
EP0150130A3 (de) 1986-01-29
JPS60119724U (ja) 1985-08-13
JPH0311867Y2 (de) 1991-03-20

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

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AK Designated contracting states

Designated state(s): BE DE FR GB

PUAL Search report despatched

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AK Designated contracting states

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17P Request for examination filed

Effective date: 19860314

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Effective date: 19870217

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

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18D Application deemed to be withdrawn

Effective date: 19870630

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SOKAI, KATSUJI

Inventor name: FURUKAWA, KAZUYA