EP2289081B1 - Power transformer having a stepping switch - Google Patents

Power transformer having a stepping switch Download PDF

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Publication number
EP2289081B1
EP2289081B1 EP09757146.7A EP09757146A EP2289081B1 EP 2289081 B1 EP2289081 B1 EP 2289081B1 EP 09757146 A EP09757146 A EP 09757146A EP 2289081 B1 EP2289081 B1 EP 2289081B1
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EP
European Patent Office
Prior art keywords
tap changer
transformer
oil
load tap
power transformer
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.)
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EP09757146.7A
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German (de)
French (fr)
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EP2289081A1 (en
Inventor
Wolfgang Albrecht
Dieter Dohnal
Rainer Frotscher
Klaus Schlepp
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
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Application filed by Maschinenfabrik Reinhausen GmbH, Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical Maschinenfabrik Reinhausen GmbH
Priority to PL09757146T priority Critical patent/PL2289081T3/en
Publication of EP2289081A1 publication Critical patent/EP2289081A1/en
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    • 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
    • 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
    • H01H9/0044—Casings; Mountings; Disposition in transformer housing
    • 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

Definitions

  • the invention relates to an oil-filled power transformer with a likewise oil-filled tap changer.
  • NL90244C discloses a power transformer, wherein an expansion vessel is connected via a pipe to the interior of the transformer tank. Inside, both the tap changer and the transformer are arranged.
  • strain radiators are known, which are attached to the outer sides of the transformer and which are used at the same time for cooling and recording the thermal expansion of the oil. This eliminates the usually existing, often expansive expansion vessel, which is usually mounted above the transformer cover.
  • strain radiators allow the construction of a closed system in which the transformer oil has no direct contact with the outside air and therefore can not oxidize (-> oil aging, sludge formation).
  • Such hermetically sealed systems also allow the use of flame retardant, renewable raw materials, biodegradable ester oils that must be protected against oxidation.
  • strain radiators have a uniform size, which results as the optimum of cooling surface and variable volume.
  • variable volume poses great challenges to the durability of the material used.
  • the in-transformer tap changer is connected via a pipe with its own Dehnradiator, which serves alone to accommodate the volume expansion of tap changer oil. Due to the very small change in volume of the tap-changer oil in comparison with the transformer oil, the stretching radiator provided for the tap changer is several times oversized.
  • the gas space is filled with nitrogen.
  • About pipes are the Gas chambers directly in connection with nitrogen-filled expansion tanks, the volume of which is dimensioned so that the pressure conditions, which adjust due to the volume expansion of the oil over the entire operating temperature range in a predetermined allowable range remain (eg between 0 bar and 0.5 50 kPa (bar) overpressure).
  • the large nitrogen containers which increase the outside dimensions of the transformer by approx. 20%.
  • the nitrogen pad is located directly under the transformer or step switch cover, so that can be dispensed with any expansion vessels.
  • solutions with separate expansion tanks for transformer and tap changer are known in which there is a rubber bag or a rubber membrane in the interior of the expansion vessel, with which an air discharge of the oil is achieved.
  • the interior of the rubber bag or the surface of the rubber membrane facing away from the oil is in communication with the ambient air via a drying template.
  • the disadvantage here is the limited life of the rubber bag or the rubber membrane, since by aging the rubber after 10-15 years is porous and thus permeable to oxygen.
  • the object of the invention is to provide a simple solution, with a low structural complexity, a compensation of the thermal expansion of both the oil in the transformer tank and the separate tap changer oil is possible.
  • the existing at the tap changer head flange which is provided according to the prior art for connection to a separate expansion vessel only for the tap changer, is now connected by means of a pipe to the oil tank of the transformer.
  • the flange on the transformer to connect an expansion vessel - and only this - is actually connected to the single expansion vessel via another pipeline.
  • the only expansion vessel now cascades both the oil volume changes of the tap changer oil tank and the transformer oil tank.
  • both flanges of both the tap changer and the transformer are connected to each other via a pipe, and this pipe is connected via another pipe connection in turn with the single expansion tank in connection.
  • An oil flow relay is located in the pipe joint leading away from the tap changer flange, which triggers the circuit breaker of the transformer when a certain oil flow limit is exceeded. In this way, oil flows above a tap changer-specific limit value, which characterize a possible malfunction of the tap changer, can be reliably detected.
  • the tap changer 2 has a selector 2.1 arranged at the bottom, which is connected via electrical connecting lines to the winding taps of the power transformer 1, as well as a diverter switch 2.2 arranged above it with its own oil-filled diverter switch vessel.
  • the entire assembly is located in an oil-filled transformer tank 3.
  • the tap changer 2 has an upper flange 4, the transformer tank 3 quite analogous to an upper flange 5.
  • the two flanges 4, 5 are known in the art with separate ⁇ lausdehnungsgefä call, Dehnradiatoren or other means connected to the volume compensation.
  • the flange 4 of the tap changer is provided with a pipe 6, which opens into the oil-filled transformer tank 3.
  • an oil flow relay 7 is inserted.
  • Only the flange 5 of the transformer tank 3 leads via a further pipeline to a single oil expansion vessel 8.
  • the hermetic seal of the oil by means of a rubber bag 11, the interior of which is in communication with the ambient air.
  • Figure lb shows a modified embodiment. Identical components are provided with the same reference numerals; on a repeated explanation of the overall structure can therefore be omitted.
  • the flange 4 of the tap changer 2 and the flange 5 of the transformer tank 3 are connected by means of a common pipe 9.
  • an oil flow relay 7 is connected.
  • This common, both flanges 4, 5 connecting, pipe 9 in turn is in turn with the single oil conservator 8 in connection.
  • a pressure relief valve 10 as available for example under the trade name MPreC® provide. Its mode of action has already been explained above.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Transformer Cooling (AREA)

Description

Die Erfindung betrifft einen ölgefüllten Leistungstransformator mit einem ebenfalls ölgefüllten Stufenschalter.The invention relates to an oil-filled power transformer with a likewise oil-filled tap changer.

Sowohl bei ölgefüllten Leistungstransformatoren als auch bei ölgefüllten Stufenschaltern ist es erforderlich, Mittel zum Ausgleich der thermischen Ausdehnung des Öles vorzusehen.Both in oil-filled power transformers and oil-filled tap changers, it is necessary to provide means to compensate for the thermal expansion of the oil.

Üblicherweise werden dazu Ölausdehnungsgefäße verwendet, die über eine Rohrleitung mit dem Ölgefäß des Transformators bzw. dem Ölgefäß des Stufenschalters in Verbindung stehen. NL90244C offenbart einen Leistungstransformator, wobei ein Ausdehnungsgefäß über eine Rohrleitung mit dem Inneren des Transformatorkessels verbunden ist. Im Inneren sind sowohl der Stufenschalter als auch der Transformator angeordnet sind.Usually this Ölausdehnungsgefäße be used, which are connected via a pipe to the oil vessel of the transformer or the oil vessel of the tap changer in combination. NL90244C discloses a power transformer, wherein an expansion vessel is connected via a pipe to the interior of the transformer tank. Inside, both the tap changer and the transformer are arranged.

Weiterhin sind sogenannte "Dehnradiatoren" bekannt, die an den Außenseiten des Transformators angebracht sind und die gleichzeitig zur Kühlung und Aufnahme der Wärmeausdehnung des Öles verwendet werden. Damit entfällt das üblicherweise vorhandene, oft ausladende Ausdehnungsgefäß, welches üblicherweise oberhalb des Transformatordeckels angebracht wird. Mit Hilfe dieser Dehnradiatoren lässt sich ein geschlossenes System aufbauen, bei dem das Transformatoröl keinen direkten Kontakt zur Außenluft hat und deshalb nicht oxidieren kann (-> Ölalterung, Schlammbildung) .Derartige hermetisch geschlossene Systeme ermöglichen auch den Einsatz schwer entflammbarer, auf nachwachsenden Rohstoffen basierender, biologisch abbaubarer Ester-Öle, die unbedingt vor Oxidation geschützt werden müssen.Furthermore, so-called "strain radiators" are known, which are attached to the outer sides of the transformer and which are used at the same time for cooling and recording the thermal expansion of the oil. This eliminates the usually existing, often expansive expansion vessel, which is usually mounted above the transformer cover. These strain radiators allow the construction of a closed system in which the transformer oil has no direct contact with the outside air and therefore can not oxidize (-> oil aging, sludge formation). Such hermetically sealed systems also allow the use of flame retardant, renewable raw materials, biodegradable ester oils that must be protected against oxidation.

Die Dehnradiatoren besitzen eine einheitliche Größe, die sich als Optimum aus kühlender Oberfläche und veränderbarem Volumen ergibt. Hierbei stellt das veränderbare Volumen große Herausforderungen an die Haltbarkeit des verwendeten Materials.The strain radiators have a uniform size, which results as the optimum of cooling surface and variable volume. Here, the variable volume poses great challenges to the durability of the material used.

Der im Transformator eingebaute Stufenschalter ist über eine Rohrleitung mit einem eigenen Dehnradiator verbunden, der alleine zur Aufnahme der Volumenausdehnung des Stufenschalteröles dient. Aufgrund der im Vergleich zum Trafoöl sehr geringen Volumenänderung des Stufenschalteröles ist der für den Stufenschalter vorgesehene Dehnradiator mehrfach überdimensioniert.The in-transformer tap changer is connected via a pipe with its own Dehnradiator, which serves alone to accommodate the volume expansion of tap changer oil. Due to the very small change in volume of the tap-changer oil in comparison with the transformer oil, the stretching radiator provided for the tap changer is several times oversized.

Weiterhin ist eine Lösung mit getrennten Ausdehnungsgefäßen für Transformator und Stufenschalter bekannt, deren Gasraum mit Stickstoff gefüllt ist. Über Rohrleitungen stehen die Gasräume direkt mit stickstoffgefüllten Ausgleichsbehältern in Verbindung, deren Volumen so dimensioniert ist, dass die Druckverhältnisse, die sich aufgrund der Volumenausdehnung des Öles einstellen, über den gesamten Betriebstemperaturbereich in einem vorgegebenen, zulässigen Bereich bleiben (z. B. zwischen 0 bar und 0.5 50 kPa (bar) Überdruck). Nachteilig sind hier die großen Stickstoffbehälter, die die Außenabmessungen des Trafos um ca. 20% vergrößern. In einer anderen Ausführungsform befindet sich das Stickstoffpolster direkt unter dem Transformator- bzw. Stufenschalterdeckel, so dass auf jegliche Ausdehnungsgefäße verzichtet werden kann. Aufgrund des deutlich kleineren Gasvolumens muss hier eine aktive Druckregelung mit Hilfe einer Druckregeleinheit erfolgen, mit der automatisch sowohl ein unzulässig hoher Überdruck über ein Ventil an die Umgebungsluft abgelassen, als auch ein Unterdruck durch Einblasen zusätzlichen Stickstoffs aus einer Druckgasflasche ausgeglichen werden kann. Der Transformator benötigt spezielle Hochspannungs-Durchführungen, mit der die Isolierstrecke im Gasraum sicher überbrückt werden kann. Da der Stufenschalter einen vom Transformator getrennten Gasraum besitzt, ist für den Stufenschalter eine eigene Stickstoff Regeleinheit vorzusehen. Nachteilig bei dieser Lösung ist der erhebliche technische Zusatzaufwand für die Stickstoff-Regeleinheiten.Furthermore, a solution with separate expansion tanks for transformer and tap changer is known, the gas space is filled with nitrogen. About pipes are the Gas chambers directly in connection with nitrogen-filled expansion tanks, the volume of which is dimensioned so that the pressure conditions, which adjust due to the volume expansion of the oil over the entire operating temperature range in a predetermined allowable range remain (eg between 0 bar and 0.5 50 kPa (bar) overpressure). Disadvantages here are the large nitrogen containers, which increase the outside dimensions of the transformer by approx. 20%. In another embodiment, the nitrogen pad is located directly under the transformer or step switch cover, so that can be dispensed with any expansion vessels. Due to the significantly smaller gas volume must be done here by an active pressure control by means of a pressure control unit with the automatically both an excessively high pressure over a valve to the ambient air drained, and a negative pressure can be compensated by blowing additional nitrogen from a compressed gas cylinder. The transformer requires special high-voltage bushings, with which the insulating section in the gas space can be safely bridged. Since the tap changer has a separate gas chamber from the transformer, a separate nitrogen control unit is to be provided for the tap changer. A disadvantage of this solution is the considerable technical overhead for the nitrogen control units.

Weiterhin sind Lösungen mit getrennten Ausdehnungsgefäßen für Transformator und Stufenschalter bekannt, bei denen sich im Innenraum des Ausdehnungsgefäßes ein Gummisack oder eine Gummimembran befindet, mit denen ein Luftabschuss des Öles erreicht wird. Das Innere des Gummisacks bzw. die dem Öl abgewandte Oberfläche der Gummimembran steht über eine Trocknungsvorlage mit der Umgebungsluft in Verbindung. Nachteilig ist hier die begrenzte Lebensdauer des Gummisacks bzw. der Gummimembran, da durch Alterungsprozesse das Gummi nach 10-15 Jahren porös und damit durchlässig für Sauerstoff wird.Furthermore, solutions with separate expansion tanks for transformer and tap changer are known in which there is a rubber bag or a rubber membrane in the interior of the expansion vessel, with which an air discharge of the oil is achieved. The interior of the rubber bag or the surface of the rubber membrane facing away from the oil is in communication with the ambient air via a drying template. The disadvantage here is the limited life of the rubber bag or the rubber membrane, since by aging the rubber after 10-15 years is porous and thus permeable to oxygen.

Aufgabe der Erfindung ist es, eine einfache Lösung anzugeben, mit der bei geringem baulichen Aufwand ein Ausgleich der thermischen Ausdehnung sowohl des Öles im Transformatorkessel als auch des separaten Stufenschalteröles möglich ist.The object of the invention is to provide a simple solution, with a low structural complexity, a compensation of the thermal expansion of both the oil in the transformer tank and the separate tap changer oil is possible.

Diese Aufgabe wird durch einen Leistungstransformator mit Stufenschalter mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a power transformer with tap changer having the features of claim 1.

Der Unteranspruch betrifft eine vorteilhafte WeiterbildungThe dependent claim relates to an advantageous development

Die allgemeine erfinderische Idee, die den beiden Möglichkeiten in den nebengeordneten Patentansprüchen zugrunde liegt, besteht darin, mit einem einzigen Ausdehnungsgefäß sowohl für Transformator als auch Stufenschalter auszukommen.The general inventive idea that underlies the two possibilities in the independent patent claims is to make do with a single expansion vessel for both transformer and tap changer.

Gemäß einer erfindungsgemäßen Ausführungsform wird dabei der am Stufenschalterkopf vorhandene Flansch, der nach dem Stand der Technik für die Verbindung mit einem separaten Ausdehnungsgefäß nur für den Stufenschalter vorgesehen ist, jetzt mittels einer Rohrleitung mit dem Öltank des Transformators verbunden. Der Flansch am Transformator zum Anschluss eines Ausdehnungsgefäßes - und nur dieser - wird tatsächlich mit dem einzigen Ausdehnungsgefäß über eine weitere Rohrleitung verbunden. Das jetzt einzige Ausdehnungsgefäß nimmt also kaskadierend sowohl die Ölvolumenänderungen des Stufenschalter-Ölgefäßes als auch des Trafo-Ölgefäßes auf.According to one embodiment of the invention, the existing at the tap changer head flange, which is provided according to the prior art for connection to a separate expansion vessel only for the tap changer, is now connected by means of a pipe to the oil tank of the transformer. The flange on the transformer to connect an expansion vessel - and only this - is actually connected to the single expansion vessel via another pipeline. The only expansion vessel now cascades both the oil volume changes of the tap changer oil tank and the transformer oil tank.

Gemäß einer weiteren nicht beanspruchten Ausführungsform, der der gleiche allgemeine Gedanke zugrunde liegt, sind beide Flansche sowohl des Stufenschalters als auch des Transformators miteinander über eine Rohrleitung verbunden, und diese Rohrleitung steht über eine weitere Rohrverbindung wiederum mit dem einzigen Ausdehnungsgefäß in Verbindung.According to a further embodiment not claimed, which is based on the same general idea, both flanges of both the tap changer and the transformer are connected to each other via a pipe, and this pipe is connected via another pipe connection in turn with the single expansion tank in connection.

In der vom Flansch des Stufenschalters wegführenden Rohrverbindung ist ein Ölströmungsrelais angeordnet, das bei Überschreitung eines bestimmten Ölströmungs-Grenzwertes den Leistungsschalter des Transformators auslösen. Auf diese Weise können Ölströmungen oberhalb eines stufenschalterspezifischen Grenzwertes, die eine mögliche Fehlfunktion des Stufenschalters kennzeichnen, sicher detektiert werden.An oil flow relay is located in the pipe joint leading away from the tap changer flange, which triggers the circuit breaker of the transformer when a certain oil flow limit is exceeded. In this way, oil flows above a tap changer-specific limit value, which characterize a possible malfunction of the tap changer, can be reliably detected.

Bei beiden Ausführungsformen der Erfindung ist es sinnvoll, auf den Stufenschalterkopf ein an sich bekanntes Druckentlastungsventil anzuordnen, das bei Überschreitung eines fest voreingestellten Überdruckes, z. B. 137.9 kPa (20 psi) nahezu verzögerungsfrei öffnet und den Überdruck auf den maximal zulässigen Wert begrenzt. Damit werden größere mechanische Schäden am Stufenschalter sowie am Transformator verhindert.In both embodiments of the invention, it makes sense to arrange on the tap changer head a per se known pressure relief valve which, when exceeding a fixed preset overpressure, z. B. 137.9 kPa (20 psi) opens almost instantaneously and limits the overpressure to the maximum permissible value. This prevents major mechanical damage to the tap-changer and the transformer.

Die Erfindung soll nachfolgend an Hand von Zeichnungen beispielhaft noch näher erläutert werden.The invention will be explained in more detail by way of example with reference to drawings.

Es zeigen:

Abbildung 1a
eine erste Ausführungsform der Erfindung gemäß Patentanspruch 1
Abbildung 1b
eine zweite nicht beanspruchte Ausführungsform
Show it:
Figure 1a
A first embodiment of the invention according to claim 1
Figure 1b
a second unclaimed embodiment

Zunächst soll die Abbildung 1a erläutert werden. Dort sind in schematischer Darstellung ein elektrischer Leistungstransformator 1 und ein mit ihm in Verbindung stehender Stufenschalter 2 dargestellt. In der gezeigten Ausführungsform besitzt der Stufenschalter 2 einen unten angeordneten Wähler 2.1, der über elektrische Verbindungsleitungen mit den Wicklungsanzapfungen des Leistungstransfonnators 1 verbunden ist, sowie einem darüber angeordneten Lastumschalter 2.2 mit einem eigenen ölgefüllten Lastumschaltergefäß. Die gesamte Anordnung befindet sich in einem ölgefüllten Transformatorkessel 3. Der Stufenschalter 2 besitzt einen oberen Flansch 4, der Transformatorkessel 3 ganz analog einen oberen Flansch 5. Die beiden Flansche 4, 5 werden nach dem Stand der Technik mit separaten Ölausdehnungsgefäßen, Dehnradiatoren oder anderen Mitteln zum Volumenausgleich verbunden. Erfindungsgemäß ist hier der Flansch 4 des Stufenschalters mit einer Rohrleitung 6 versehen, die in den ölgefüllten Transformatorkessel 3 mündet. In dieser Rohrleitung 6 ist ein Ölströmungsrelais 7 eingefügt. Nur der Flansch 5 des Transformatorkessels 3 führt über eine weitere Rohrleitung zu einem einzigen Ölausdehnungsgefäß 8. Beispielsweise erfolgt der hermetische Abschluss des Öls mittels eines Gummisacks 11, dessen Inneres mit der Umgebungsluft in Verbindung steht.First, the Figure 1a be explained. There are shown in a schematic representation of an electric power transformer 1 and a standing with him tap changer 2. In the embodiment shown, the tap changer 2 has a selector 2.1 arranged at the bottom, which is connected via electrical connecting lines to the winding taps of the power transformer 1, as well as a diverter switch 2.2 arranged above it with its own oil-filled diverter switch vessel. The entire assembly is located in an oil-filled transformer tank 3. The tap changer 2 has an upper flange 4, the transformer tank 3 quite analogous to an upper flange 5. The two flanges 4, 5 are known in the art with separate Ölausdehnungsgefäßen, Dehnradiatoren or other means connected to the volume compensation. According to the invention here the flange 4 of the tap changer is provided with a pipe 6, which opens into the oil-filled transformer tank 3. In this pipe 6, an oil flow relay 7 is inserted. Only the flange 5 of the transformer tank 3 leads via a further pipeline to a single oil expansion vessel 8. For example, the hermetic seal of the oil by means of a rubber bag 11, the interior of which is in communication with the ambient air.

Abbildung lb zeigt eine abgewandelte Ausführungsform. Gleiche Bauteile sind mit gleichen Bezugszeichen versehen; auf eine nochmalige Erläuterung des Gesamtaufbaus kann daher verzichtet werden. Abweichend sind bei dieser Ausführungsform der Flansch 4 des Stufenschalters 2 sowie der Flansch 5 des Transformatorkessels 3 mittels einer gemeinsamen Rohrleitung 9 verbunden. In diese Rohrleitung 9 ist wiederum ein Ölströmungsrelais 7 geschaltet. Diese gemeinsame, beide Flansche 4, 5 verbindende, Rohrleitung 9 steht ihrerseits wiederum mit dem einzigen Ölausdehnungsgefäß 8 in Verbindung.Figure lb shows a modified embodiment. Identical components are provided with the same reference numerals; on a repeated explanation of the overall structure can therefore be omitted. Deviating in this embodiment, the flange 4 of the tap changer 2 and the flange 5 of the transformer tank 3 are connected by means of a common pipe 9. In this pipe 9, in turn, an oil flow relay 7 is connected. This common, both flanges 4, 5 connecting, pipe 9 in turn is in turn with the single oil conservator 8 in connection.

Es ist sinnvoll, oberhalb des Stufenschalterkopfes, d. h. außerhalb des Transformatorenkessels 3, ein Druckentlastungsventil 10, wie es beispielsweise unter der Handelsbezeichnung MPreC® erhältlich ist, vorzusehen. Dessen Wirkungsweise wurde weiter oben bereits erläutert.It makes sense, above the tap changer head, d. H. outside the transformer tank 3, a pressure relief valve 10, as available for example under the trade name MPreC® provide. Its mode of action has already been explained above.

Claims (2)

  1. Power transformer with on-load tap changer, wherein both the power transformer and the on-load tap changer are oil-filled, wherein the on-load tap changer is arranged in the transformer tank of the transformer, wherein both the transformer and on-load tap changer have at the upper sides thereof a respective connecting flange for connection with an oil expansion vessel and wherein the connecting flange of the on-load tap changer leads by way of a pipe duct into the interior of the transformer tank of the power transformer, characterised in that the end of the pipe duct (6) leading into the interior of the transformer tank is open in such a manner that the oil volumes of on-load tap changer (2) and power transformer (1) are connected with one another, that an oil flow relay (7) is arranged in this pipe duct (6) and that only the connecting flange (5) of the transformer tank (3) leads to a single oil expansion vessel (8).
  2. Power transformer with on-load tap changer according to claim 1, characterised in that a pressure relief valve (10) connected with the oil volume of the on-load tap changer (2) is arranged above the on-load tap changer head of the on-load tap changer (2).
EP09757146.7A 2008-06-06 2009-04-07 Power transformer having a stepping switch Active EP2289081B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09757146T PL2289081T3 (en) 2008-06-06 2009-04-07 Power transformer having a stepping switch

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008027274A DE102008027274B3 (en) 2008-06-06 2008-06-06 Power transformer with tap changer
PCT/EP2009/002542 WO2009146762A1 (en) 2008-06-06 2009-04-07 Power transformer having a stepping switch

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EP2289081A1 EP2289081A1 (en) 2011-03-02
EP2289081B1 true EP2289081B1 (en) 2015-08-05

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US (1) US20110063064A1 (en)
EP (1) EP2289081B1 (en)
JP (1) JP2011522428A (en)
KR (1) KR20110015470A (en)
CN (1) CN102057453A (en)
CA (1) CA2726873C (en)
DE (1) DE102008027274B3 (en)
ES (1) ES2551321T3 (en)
PL (1) PL2289081T3 (en)
RU (1) RU2505875C2 (en)
UA (1) UA100156C2 (en)
WO (1) WO2009146762A1 (en)

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DE202010011524U1 (en) 2010-08-18 2011-11-23 Maschinenfabrik Reinhausen Gmbh step switch
RU2013111815A (en) 2010-08-18 2014-09-27 Машиненфабрик Райнхаузен Гмбх STEP SWITCH
DE202010011521U1 (en) * 2010-08-18 2011-11-23 Maschinenfabrik Reinhausen Gmbh OLTC
DE102011008689B3 (en) 2011-01-15 2012-03-08 Maschinenfabrik Reinhausen Gmbh step switch
JP2013058527A (en) * 2011-09-07 2013-03-28 Meiden T&D Co Ltd Transformer
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DE102008027274B3 (en) 2009-08-27
RU2505875C2 (en) 2014-01-27
RU2010153989A (en) 2012-07-20
JP2011522428A (en) 2011-07-28
EP2289081A1 (en) 2011-03-02
US20110063064A1 (en) 2011-03-17
PL2289081T3 (en) 2015-12-31
ES2551321T3 (en) 2015-11-18
CA2726873C (en) 2016-09-06
KR20110015470A (en) 2011-02-15
UA100156C2 (en) 2012-11-26
CN102057453A (en) 2011-05-11
CA2726873A1 (en) 2009-12-10
WO2009146762A1 (en) 2009-12-10

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