EP2724357B1 - Relais buchholz - Google Patents

Relais buchholz Download PDF

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Publication number
EP2724357B1
EP2724357B1 EP12720874.2A EP12720874A EP2724357B1 EP 2724357 B1 EP2724357 B1 EP 2724357B1 EP 12720874 A EP12720874 A EP 12720874A EP 2724357 B1 EP2724357 B1 EP 2724357B1
Authority
EP
European Patent Office
Prior art keywords
buchholz relay
collecting chamber
magnetic
float
flow flap
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.)
Active
Application number
EP12720874.2A
Other languages
German (de)
English (en)
Other versions
EP2724357A1 (fr
Inventor
Kai Hämel
Ullrich REHNELT
Karsten Viereck
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.)
Maschinenfabrik Reinhausen GmbH
Scheubeck GmbH and Co
Original Assignee
Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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 Maschinenfabrik Reinhausen GmbH, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical Maschinenfabrik Reinhausen GmbH
Publication of EP2724357A1 publication Critical patent/EP2724357A1/fr
Application granted granted Critical
Publication of EP2724357B1 publication Critical patent/EP2724357B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/55—Oil reservoirs or tanks; Lowering means therefor
    • H01H33/555—Protective arrangements responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays
    • 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
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/02—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by movement of a float carrying a magnet
    • 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
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/404—Protective devices specially adapted for fluid filled transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/40—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane

Definitions

  • a Buchholz relay is a long-known protective device for oil-insulated power transformers.
  • the Buchholz relay indicates faults such as short circuits, windings or even defects in the transformer oil. For small deviations, such as gas development, this condition is usually only reported - there is a so-called "Buchholzwar Vietnamese". For significant errors, such. B. short circuits, the transformer is turned off.
  • the well-known Buchholz relay is based on the fact that in oil-cooled transformers insulation faults or even a heavy overload can lead to local overheating, which causes gas to develop in the oil space of the transformer.
  • the gas bubbles collect in the upper part of the housing of the Buchholz relay and displace the oil there in the regular state. With small errors, this gas formation lowers a float of the Buchholz relay and a contact is closed, which reports this error. For larger errors, a sudden overpressure arises, which causes an equally strong strong flow of oil.
  • another switch is closed in the Buchholz relay with the help of a throttle valve, a flap or a similar device, which switches off the transformer immediately and thus protects against further damage.
  • the known Buchholz relay is usually located in the oil connection line from the transformer to its expansion vessel.
  • the well-known Buchholz relay has a pipe connection on the upper housing cover. This can occasionally be taken by the operator of the transformer, a gas sample and carried out a gas analysis.
  • DE3248275 A1 discloses a Buchholz relay according to the preamble of claim 1.
  • the object of the invention is to overcome these disadvantages and to provide a simple design, compact Buchholz relay, the functionally reliable electrical contact elements, which are easily replaceable and also allows a (remote) testing the functionality of the Buchholz relay from the distance without shutting down the transformer.
  • the general inventive idea consists firstly of providing magnetic interrupters, preferably protective gas magnetic interrupters, in a separate housing.
  • the further general inventive idea is to provide a separate line, the free end leads to the area of the damper and can be supplied from the outside by oil or air under pressure, so that a function monitoring also far away from the Buchholz relay, in a safe place , can be done.
  • FIG. 1 shows a Buchholz relay according to the invention with a housing 1, on which an upper part 2 is fastened by means of a screw connection 3.
  • a first screw 4 is provided with a connection 4.1, also a screw 5 with a connection 5.1.
  • a cable gland 6 is provided, through which the electrical lines not shown here are led by the electrical switching elements inside to the outside.
  • Housing 1 and upper part 2 enclose a collecting space, which is at least partially - in regular operation completely - filled with insulating liquid.
  • FIG. 2 shows in the sectional plane AA first a cover 7, wherein the underlying components are explained later.
  • This cover 7 is fastened by means of a screw 8 on the lid.
  • a fall flap 9 and a flow channel 10 are shown in the lower region, further a fuse 10.1.
  • the side is vertical in the housing of Buchholz relay a dip tube 11, comprising an upper part 11.1, a lower part 11.2, a lower, final sealing plug 11.3 and a glass tube holder 11.4.
  • a protective gas solenoid 12 Within the dip tube 11 is a protective gas solenoid 12, which here has two superimposed contacts, which are designed as openers has. Instead of a normally closed contact, the contacts can also be designed as normally open contacts or else as changeover contacts.
  • a guide rod 13 is shown having a lower connecting rod 14 and an upper connecting rod 15.
  • the upper connecting rod 15 is mechanically connected to an upper float 16; the lower connecting rod 14 is connected via a disc 14.1 with a lower float 17 in connection.
  • FIG. 3 shows the Buchholz relay according to the invention in the sectional view BB.
  • a flow flap 18 and its retaining bolt 19 are also shown.
  • a fork 20 for connection to the lower float 17.
  • Sideways on the upper lid area is a button 21 under the previously mentioned cover 7. This button 21 serves to reset as well for functional testing on site at the device; it is connected via a test rod 22 with a pressure lever 24, wherein between a spring 23 is inserted.
  • a return plate 25 with a holder 25 a.
  • a magnetic assembly for fixation in the tripped state consisting of a magnet housing 26, a magnetic plate 27, a magnet 28 and its magnet holder 29th
  • FIG. 4 is shown in section DD further side a check valve 30 with a screw 30.1 shown, which communicates via a connecting part 30.2 with a line 31 in connection.
  • This line 31 ends with its free end in the region of the flow flap 18.
  • a holder 32 of the trapdoor 9 which has already been mentioned earlier, furthermore a corresponding locking washer 32.1.
  • the line 31 leads over the in FIG. 1 shown screw 4 from the there also shown connection 4.1 to the outside. It can be of any length and be led to a location located on the ground or in another location. From there it can be supplied with air or pressurized oil, so that a functional test of Buchholz relay can be done from a distance. The air can be released from the Buchholz relay via the further connection 5.1.
  • protective gas solenoid switch 12 which are arranged vertically above one another in the immersion tube 11 also explained, can be easily removed with the entire dip tube or by disassembly of the glass tube holder 11.4.
  • two upper contacts which correspond to the upper float 16, and two lower contacts, which correspond to the lower float 17 and are actuated by the respective float deflection, are opened one above the other, are opened here, intended.
  • the invention is not limited thereto; There are also other magnetic interrupters with other numbers of individual contacts possible, which need not necessarily be designed as an opener. It is also possible within the scope of the invention to provide two parallel immersion tubes 11, each having one or more shielding gas solenoid 12.
  • the gas in the insulating liquid moves upward, accumulates in the Buchholz relay and reduces the liquid level in the Buchholz relay.
  • the upper float 16 is deflected; it operates without contact the upper contact or the upper contacts of the inert gas magnetic switch 12 and thus triggers an alarm.
  • the lower float 19 is not affected.
  • the upper float 16 thus switches at gas accumulation at least one upper contact of the protective gas magnetic switch 12th
  • the upper float 16 also switches these contacts when oil is lost.
  • the lower float 17 switches with complete loss of oil the at least one lower contact of the protective gas magnet switch 12.
  • the inert gas solenoid 12 can thus both by one or both float 16 and / or 17 and the flow flap 18 are actuated; separate contacts for triggering by the flow flap 18 omitted so.
  • the flow flap 18 can be detected by the trap door 9; An unlocking of the fall flap 9 is carried out by pressing the button 21 under the cover 7. An automatic reset can also be done by removing the trap door 9.
  • a remote inspection of the flow flap 25 is possible by injecting oil from the outside into the conduit 31.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
  • Measuring Volume Flow (AREA)
  • Fluid-Damping Devices (AREA)

Claims (5)

  1. Relais Buchholz pour surveiller les dégagements de gaz et le liquide isolant dans des installations haute tension remplies de liquide, en particulier des transformateurs de puissance ou des commutateurs à gradins, et assurer la protection de telles installations, dans lequel il est prévu dans un boîtier, une chambre collectrice qui est au moins partiellement remplie d'un liquide isolant, dans laquelle sont montés l'un sur l'autre deux flotteurs pouvant être déplacés, qui agissent sur un dispositif de commutation électrique, ainsi qu'un volet d'écoulement pouvant être déplacé et qui agit également sur un dispositif de commutation électrique,
    le dispositif de commutation électrique étant constitué d'au moins un tube de commutation magnétique (12), pouvant être actionné par les deux flotteurs (16, 17) et également par le volet d'écoulement (18),
    caractérisé en ce que
    le tube de commutation magnétique (12) est monté dans au moins un tube plongeur séparé (11) s'étendant verticalement dans la chambre collectrice, et
    il est prévu une conduite (31) dont l'extrémité libre se termine dans la chambre collectrice, dans la zone du volet d'écoulement (18), cette conduite (31) pouvant être alimentée en air ou en huile de l'extérieur, c'est-à-dire en dehors du relais Buchholz par l'intermédiaire d'une connexion (4.1) sortant de la partie supérieure (2) et comportant entre la connexion (4.1) et l'extrémité libre de la conduite (31) une soupape anti retour (30) de manière à pouvoir effectuer un contrôle du fonctionnement du relais Buchholz.
  2. Relais Buchholz conforme à la revendication 1,
    caractérisé en ce que
    le tube de commutation magnétique (12) est réalisé sous la forme d'un commutateur magnétique à gaz de protection.
  3. Relais Buchholz conforme à la revendication 1 ou 2,
    caractérisé en ce qu'
    il est prévu deux tubes plongeurs (11) parallèles,
    chacun de ces deux tubes plongeurs (11) comporte deux tubes de commutation magnétique (12) montés l'un au dessus de l'autre et ayant des contacts individuels, de sorte que deux de ces contacts puissent être actionnés par le flotteur supérieur (16) tandis que les deux autres peuvent être actionnés par le flotteur inférieur (17) et/ou le volet d'écoulement (18).
  4. Relais Buchholz conforme à la revendication 3,
    caractérisé en ce que
    les contacts individuels sont réalisés sous la forme de contacts d'ouverture, de fermeture ou d'inverseur.
  5. Relais Buchholz conforme à l'une des revendications 1 à 4,
    caractérisé en ce qu'
    il est prévu une autre connexion (5.1) sous la forme d'une connexion de contrôle pour l'air ou un autre gaz.
EP12720874.2A 2011-06-22 2012-05-14 Relais buchholz Active EP2724357B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011105397 2011-06-22
PCT/EP2012/058875 WO2012175252A1 (fr) 2011-06-22 2012-05-14 Relais buchholz

Publications (2)

Publication Number Publication Date
EP2724357A1 EP2724357A1 (fr) 2014-04-30
EP2724357B1 true EP2724357B1 (fr) 2016-03-16

Family

ID=46085042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12720874.2A Active EP2724357B1 (fr) 2011-06-22 2012-05-14 Relais buchholz

Country Status (6)

Country Link
EP (1) EP2724357B1 (fr)
CN (1) CN103620719B (fr)
ES (1) ES2577151T3 (fr)
HK (1) HK1192966A1 (fr)
PT (1) PT2724357T (fr)
WO (1) WO2012175252A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105826128B (zh) * 2015-01-07 2018-06-19 国家电网公司 多功能双浮子气体继电器
DE102017101242A1 (de) * 2017-01-24 2018-07-26 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kühlkreislauf für Batterie mit Buchholzrelais
CN107564765B (zh) * 2017-08-25 2018-12-28 中国电子科技集团公司第四十九研究所 一种浮球液位开关弹性触点
EP3544040B1 (fr) * 2018-03-20 2021-03-03 ABB Power Grids Switzerland AG Relais de protection pour transformateurs de distribution fermés hermétiquement
CN111261456A (zh) * 2020-04-08 2020-06-09 邵星源 一种气体继电器
CN111883385B (zh) * 2020-08-12 2022-09-02 郑州赛奥电子股份有限公司 一种重瓦斯与油流失功能独立的气体继电器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746146C (de) 1939-01-12 1944-06-13 Aeg Einrichtung zum Feststellen der Stoerungsursache bei OEltransformatoren
DE2049972C3 (de) * 1970-10-12 1973-09-13 Transformatoren Union Ag, 7000 Stuttgart Schutzgerat fur flussigkeitsge kühlte Transformatoren und Drosseln
DD207645A3 (de) * 1982-02-04 1984-03-07 Dietrich Kroll Stauklappe fuer schutzeinrichtungen
ITPD980061A1 (it) * 1998-03-24 1999-09-24 Comem Spa Rele' perfezionato ad accumulo di gas tipo buchholz
ITVI20070223A1 (it) * 2007-08-07 2009-02-08 Comem Spa Rele di buchholz per la protezione di apparecchiature elettriche di potenza isolate in olio.

Also Published As

Publication number Publication date
ES2577151T3 (es) 2016-07-13
CN103620719A (zh) 2014-03-05
CN103620719B (zh) 2016-07-13
EP2724357A1 (fr) 2014-04-30
WO2012175252A1 (fr) 2012-12-27
HK1192966A1 (zh) 2014-09-05
PT2724357T (pt) 2016-07-07

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