EP3001434B1 - Radiator for cooling a coolant liquid of a transformer - Google Patents

Radiator for cooling a coolant liquid of a transformer Download PDF

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Publication number
EP3001434B1
EP3001434B1 EP14186769.7A EP14186769A EP3001434B1 EP 3001434 B1 EP3001434 B1 EP 3001434B1 EP 14186769 A EP14186769 A EP 14186769A EP 3001434 B1 EP3001434 B1 EP 3001434B1
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EP
European Patent Office
Prior art keywords
cooling
radiator
transformer
cooling liquid
heat sink
Prior art date
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Application number
EP14186769.7A
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German (de)
French (fr)
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EP3001434A1 (en
Inventor
Uwe Janik
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Siemens Energy Global GmbH and Co KG
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Siemens AG
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Publication of EP3001434A1 publication Critical patent/EP3001434A1/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0308—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/02—Flexible elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/12—Safety or protection arrangements; Arrangements for preventing malfunction for preventing overpressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/14—Safety or protection arrangements; Arrangements for preventing malfunction for preventing damage by freezing, e.g. for accommodating volume expansion

Definitions

  • the invention relates to a radiator for cooling a cooling liquid of a transformer with a plurality of cooling tubes running parallel to a longitudinal axis of the radiator for receiving cooling liquid.
  • Transformers are generally subject to aging and wear, especially if they are at increased risk of corrosion, for example when used on offshore platforms. Therefore, regular and event-related maintenance work is carried out on transformers.
  • Liquid-cooled transformers generally have expansion vessels which serve to hold coolant, usually transformer oil, in order to compensate for thermal expansion of the coolant.
  • To transport coolant between an expansion vessel and the transformer tank, such a transformer also has coolant lines. Both the expansion vessel and the coolant lines increase the surface area of a transformer exposed to environmental influences and thus its susceptibility to damage from these environmental influences and thereby also the need for maintenance and repair work.
  • an expansion vessel inherently causes contact between the cooling liquid and the surroundings, which can adversely affect the cooling liquid and components in contact with it in the long term.
  • DE 10010737 C2 discloses a radiator for an electrical transformer with two with a plurality of beads provided sheets, which are connected to each other in the beads, and form the cavities with a resulting volume, the two sheets in the beads being connected to one another in such a way that the volume of the cavities can be increased over a plurality of bulges.
  • a radiator for cooling a cooling liquid of a transformer which has cooling pipes running parallel to one another.
  • the cooling tubes are spaced apart from one another by an intermediate section and have an oval shape in cross section.
  • the radiator is made of steel.
  • a radiator is known whose cooling tubes are angular in cross section. Two such cooling tubes are connected to one another by beads, so that the volume of the cavities can be increased by bulges.
  • the invention has for its object to provide an improved radiator for cooling a cooling liquid of a transformer, which in particular reduces the need for maintenance and repair of the transformer.
  • a radiator according to the invention for cooling a cooling liquid of a transformer comprises at least one cooling body, which has a plurality of cooling tubes which run parallel to a longitudinal axis of the cooling body and are spaced apart from one another of coolant.
  • Each cooling tube has at least one cooling tube wall running along the longitudinal axis of the cooling body, which is designed to be elastically deformable in order to increase the volume enclosed by the cooling tube.
  • the cooling tubes are spaced apart from one another along an X direction and each run parallel to a longitudinal axis of the radiator running in a Z direction, so that two adjacent cooling tubes are separated from one another by a separating gap running in the Z direction.
  • the invention also provides that at least one elastically deformable cooling tube wall has two edge regions running along the longitudinal axis of the heat sink and an elastically deformable middle region connecting these two edge regions, the central region being essentially flat in the undeformed state and each edge region being to an outside of the Cooling pipe wall curved shaft is formed with a shaft crest running parallel to the longitudinal axis of the heat sink.
  • Such a radiator can compensate for thermal expansion of the cooling liquid by increasing the volume enclosed by the cooling tubes.
  • the radiator can thereby also take on the function of an expansion vessel to compensate for thermal expansion of the cooling liquid in addition to cooling the cooling liquid.
  • a transformer with a radiator of this type does not require an additional expansion vessel and therefore also no coolant lines between the expansion vessel and the transformer tank. This advantageously reduces the number of components of the transformer and the installation space required for this, as well as the maintenance and repair requirements for these components.
  • contact of the coolant with the environment, as occurs in principle when using an expansion vessel, and the resulting impairment of the coolant and components in contact therewith can advantageously be avoided.
  • the invention advantageously makes it possible to implement an elastically deformable cooling tube wall in a simple manner solely through the shape of the cooling tube wall.
  • At least one cooling tube has two cooling tube walls of this type which are located opposite one another.
  • the enlargement of the volume enclosed by the cooling tube by the elastic deformation of the cooling tube walls is advantageously increased compared to a cooling tube with only one elastically deformable cooling tube wall.
  • At least one cooling tube consists of two elastically deformable cooling tube walls of the type described, the edge regions of these cooling tube walls each in a flange region running parallel to the longitudinal axis of the cooling body and facing away from the central region of the respective cooling tube wall leak, which is connected to a corresponding flange area of the other cooling tube wall in a coolant-tight manner.
  • a cooling tube can be produced in a simple and efficient manner from two elastically deformable cooling tube walls by connecting these two cooling tube walls to one another in their flange regions.
  • each elastically deformable cooling tube wall is made from a steel sheet.
  • each heat sink has at least one coolant inlet region with an inlet opening for inlet of coolant into the heat sink, the coolant inlet region being connected to a first end of at least one cooling tube for guiding coolant from the coolant inlet region into the cooling tube.
  • each heat sink has at least one coolant outlet region with an outlet opening for discharging coolant from the heat sink, the coolant outlet region being connected to a second end of at least one cooling tube for guiding coolant from the cooling tube into the coolant outlet region.
  • the two aforementioned embodiments of the invention advantageously enable the supply or removal of cooling liquid to or from a cooling body and its cooling tubes via the cooling liquid inlet area or the cooling liquid outlet area of the cooling body.
  • radiator has a plurality of heat sinks arranged one behind the other.
  • the cooling capacity of the radiator can advantageously be increased and adapted to the respective transformer.
  • a transformer according to the invention comprises a transformer tank which can be at least partially filled with a cooling liquid, a radiator according to the invention for cooling the cooling liquid, at least a first connecting line for feeding cooling liquid from the transformer tank into the radiator and at least a second connecting line for feeding cooling liquid from the radiator in the transformer tank.
  • such a transformer can be realized without an expansion vessel to compensate for thermal expansion of the cooling liquid if the radiator is designed accordingly, since the radiator also takes on the function of the expansion tank in addition to cooling the cooling liquid, which has the above-mentioned advantages, particularly with regard to Reduced maintenance and repair needs for the transformer.
  • Embodiments of such a transformer provide that the transformer has a tap changer, which comprises at least one vacuum interrupter, and / or that the transformer tank has a common coolant space for a tap changer and an active part of the transformer, and / or that the transformer has a degassing device for removing Has gas from the transformer tank and / or a drying device for dehumidifying the cooling liquid.
  • a tap changer which comprises at least one vacuum interrupter
  • the transformer tank has a common coolant space for a tap changer and an active part of the transformer
  • the transformer has a degassing device for removing Has gas from the transformer tank and / or a drying device for dehumidifying the cooling liquid.
  • a transformer according to the invention enables this also the use of a biodegradable insulating liquid, e.g. B. a natural or synthetic ester, as a cooling liquid with an acceptable aging behavior.
  • a biodegradable insulating liquid e.g. B. a natural or synthetic ester
  • the Figures 1 to 5 show various representations of a heat sink 3 of a radiator 1 for cooling a cooling liquid in a Figure 7 schematically illustrated transformer 100, a coordinate system with Cartesian coordinates X, Y, Z also being shown for better understanding is.
  • Show Figure 1 a front view of the heat sink 3,
  • Figure 2 a transparent perspective partial representation of the heat sink 3
  • Figure 3 a side view of the heat sink 3
  • Figure 4 a transparent top view of the heat sink 3
  • Figure 5 an enlarged section of the Figure 4 .
  • the radiator 1 comprises only one such heat sink 3, according to other exemplary embodiments a plurality of such heat sinks 3, which are arranged one behind the other for example along the Y direction.
  • the heat sink 3 is flat, so that it extends essentially in an XZ plane of the coordinate system shown and in the Y direction has a small extent in comparison to its dimensions in the X direction and the Y direction.
  • the heat sink 3 has a plurality of (five in the exemplary embodiment shown) cooling tubes 5 for receiving cooling liquid.
  • the cooling tubes 5 are spaced apart from one another along the X direction and each run parallel to a longitudinal axis of the radiator 1 extending in the Z direction, so that two adjacent cooling tubes 5 are separated from one another by a separating gap 7 extending in the Z direction .
  • the cooling body 3 has a cooling fluid inlet region 9 with an inlet opening 11 for the inlet of cooling fluid into the cooling body 3, the cooling fluid inlet region 9 having an upper, first end 13 of each cooling tube 5 for guiding cooling fluid from the cooling fluid inlet region 9 into the cooling tube 5 is connected.
  • the heat sink 3 has a coolant outlet region 15 with an outlet opening 17 for discharging coolant from the heat sink 3, the coolant outlet region 15 having a lower, second end 19 of each cooling tube 5 is connected to conduct cooling fluid from the cooling tube 5 into the cooling fluid outlet region 15.
  • FIG. 6 shows a cross-sectional view of a cooling tube 5 in an XY plane.
  • Each cooling tube 5 consists of two opposing cooling tube walls 21, which are each made of sheet steel, for example.
  • Each cooling tube wall 21 has two edge regions 23 running in the Z direction and an elastically deformable central region 25 connecting these two edge regions 23.
  • the central region 25 is essentially flat in the undeformed state.
  • Each edge region 23 is designed as a shaft which is curved to an outside of the cooling tube wall 21 and has a shaft crest running in the Z direction.
  • each edge region 23 ends in a flange region 27 facing away from the central region 25 of the respective cooling tube wall 21, which flange region is connected, for example welded, to a corresponding flange region 27 of the other cooling tube wall 21.
  • the heat sink 3 is closed in a coolant-tight manner except for the inlet opening 11 and the outlet opening 17, so that, apart from through the inlet opening 11 and the outlet opening 17, no coolant can enter or leave the heat sink 3.
  • FIG 7 shows schematically an embodiment of a transformer 100.
  • the transformer 100 comprises a transformer tank 102, which can be at least partially filled with a cooling liquid, a radiator 1 according to one of the above using the Figures 1 to 6 Exemplary embodiments described, a first connecting line 104 for guiding coolant from the transformer tank 102 into the radiator 1 and a second connecting line 106 for guiding coolant from the radiator 1 into the transformer tank 102.
  • the transformer 100 optionally comprises a tap changer 108 arranged in the transformer tank 102 and / or a degassing device 110 preferably arranged on an upper side of the transformer tank 102 and / or a drying device 112 arranged on the transformer tank 102.
  • the transformer tank 102 preferably has a common cooling liquid space for the Step switch 108 and an active part (not shown in detail) of the transformer 100.
  • the first connecting line 104 is designed, for example, as a collecting pipe running between the transformer tank 102 and the radiator 1, which is connected to each heat sink 3 of the radiator 1 through an opening in the collecting pipe to the inlet opening 11 of the respective heat sink 3.
  • the second connecting line 106 is correspondingly designed, for example, as a collecting pipe running between the transformer tank 102 and the radiator 1, which is connected to each heat sink 3 of the radiator 1 through an opening in the collecting pipe to the outlet opening 17 of the respective heat sink 3.
  • the tap changer 108 is used to set a voltage transformation ratio of the transformer 100 and preferably comprises at least one vacuum interrupter (not shown in more detail).
  • the degassing device 110 serves to discharge gas from the transformer tank 102, which, for. B. outgassed from the coolant.
  • the drying device 112 serves to dehumidify the cooling liquid.
  • the transformer 100 does not include an additional expansion vessel for receiving cooling liquid from the transformer tank 102 in the event of a thermal expansion of cooling liquid in the transformer tank 102.
  • the function of such an expansion tank is taken over by the radiator 1, which expands the cooling liquid in this way by increasing the thermal expansion of the Cooling tubes 5 des Radiator 1 enclosed volumes compensated by elastic deformations of the cooling tube walls 21 of the cooling tubes 5.
  • a transformer 100 include a plurality of radiators 1, which are arranged, for example, on different sides of the transformer tank 102, and / or a plurality of connecting lines 104, 106 for conducting coolant between the transformer tank 102 and the radiator 1 or the radiators 1.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Transformer Cooling (AREA)

Description

Die Erfindung betrifft einen Radiator zur Kühlung einer Kühlflüssigkeit eines Transformators mit mehreren parallel zu einer Längsachse des Radiators verlaufenden Kühlrohren zur Aufnahme von Kühlflüssigkeit.The invention relates to a radiator for cooling a cooling liquid of a transformer with a plurality of cooling tubes running parallel to a longitudinal axis of the radiator for receiving cooling liquid.

Transformatoren unterliegen generell der Alterung und dem Verschleiß, insbesondere wenn sie, beispielsweise bei einer Verwendung auf Offshore-Plattformen, verstärkt der Gefahr von Korrision ausgesetzt sind. Daher werden an Transformatoren regelmäßig sowie ereignisbedingt Wartungsarbeiten durchgeführt. Flüssigkeitsgekühlte Transformatoren weisen in der Regel Ausdehnungsgefäße auf, die der Aufnahme von Kühlflüssigkeit, in der Regel von Transformatorenöl, dienen, um thermische Expansionen der Kühlflüssigkeit zu kompensieren. Zum Transport von Kühlflüssigkeit zwischen einem Ausdehnungsgefäß und dem Transformatorkessel weist ein derartiger Transformator außerdem Kühlflüssigkeitsleitungen auf. Sowohl das Ausdehnungsgefäß als auch die Kühlflüssigkeitsleitungen erhöhen die Umwelteinflüssen ausgesetzte Oberfläche eines Transformators und damit dessen Anfälligkeit für Schädigungen durch diese Umwelteinflüsse und dadurch auch den Bedarf an Wartungs- und Reparaturarbeiten. Außerdem verursacht ein Ausdehnungsgefäß prinzipbedingt einen Kontakt zwischen der Kühlflüssigkeit und der Umgebung, was auf Dauer die Kühlflüssigkeit und damit in Kontakt stehende Bauteile beeinträchtigen kann.Transformers are generally subject to aging and wear, especially if they are at increased risk of corrosion, for example when used on offshore platforms. Therefore, regular and event-related maintenance work is carried out on transformers. Liquid-cooled transformers generally have expansion vessels which serve to hold coolant, usually transformer oil, in order to compensate for thermal expansion of the coolant. To transport coolant between an expansion vessel and the transformer tank, such a transformer also has coolant lines. Both the expansion vessel and the coolant lines increase the surface area of a transformer exposed to environmental influences and thus its susceptibility to damage from these environmental influences and thereby also the need for maintenance and repair work. In addition, an expansion vessel inherently causes contact between the cooling liquid and the surroundings, which can adversely affect the cooling liquid and components in contact with it in the long term.

DE 1971624 U offenbart membranartige Kühlelemente, die an ein Transformatorengehäuse angeschlossen sind, Öl des Transformators aufnehmen und sich entsprechend der Volumenänderung des Öls ausdehnen und zusammenziehen. DE 1971624 U discloses membrane-like cooling elements which are connected to a transformer housing, absorb oil from the transformer and expand and contract in accordance with the change in volume of the oil.

DE 10010737 C2 offenbart einen Radiator für einen elektrischen Transformator mit zwei mit einer Mehrzahl von Sicken versehenen Blechen, die in den Sicken miteinander verbunden sind, und die Hohlräume mit einem daraus resultierenden Volumen bilden, wobei die beiden Bleche in den Sicken derart miteinander verbunden sind, dass das Volumen der Hohlräume über eine Mehrzahl von Ausbauchungen vergrößerbar ist. DE 10010737 C2 discloses a radiator for an electrical transformer with two with a plurality of beads provided sheets, which are connected to each other in the beads, and form the cavities with a resulting volume, the two sheets in the beads being connected to one another in such a way that the volume of the cavities can be increased over a plurality of bulges.

Aus der GB 879200 ist ein Radiator zur Kühlung einer Kühlflüssigkeit eines Transformators bekannt, der parallel zueinander verlaufende Kühlrohre aufweist. Die Kühlrohre sind durch einen Zwischenabschnitt voneinander beabstandet und weisen im Querschnitt eine ovale Form auf. Der Radiator ist aus Stahl gefertigt. Bei einem Übergang der Kühlflüssigkeit vom flüssigen in den festen Aggregatszustand wird eine ausreichend stabile Elastizität bereitgestellt, so dass irreparable Schäden vermieden sind.From the GB 879200 a radiator for cooling a cooling liquid of a transformer is known which has cooling pipes running parallel to one another. The cooling tubes are spaced apart from one another by an intermediate section and have an oval shape in cross section. The radiator is made of steel. When the cooling liquid changes from the liquid to the solid state of aggregation, a sufficiently stable elasticity is provided so that irreparable damage is avoided.

Aus der DE 100 10 737 C2 ist ein Radiator bekannt, dessen Kühlrohre im Querschnitt eckig ausgebildet sind. Zwei solcher Kühlrohre sind durch Sicken miteinander verbunden, so dass das Volumen der Hohlräumen durch Ausbauchungen vergrößerbar ist.From the DE 100 10 737 C2 a radiator is known whose cooling tubes are angular in cross section. Two such cooling tubes are connected to one another by beads, so that the volume of the cavities can be increased by bulges.

Der Erfindung liegt die Aufgabe zugrunde, einen verbesserten Radiator zur Kühlung einer Kühlflüssigkeit eines Transformators anzugeben, der insbesondere den Wartungs- und Reparaturbedarf des Transformators reduziert.The invention has for its object to provide an improved radiator for cooling a cooling liquid of a transformer, which in particular reduces the need for maintenance and repair of the transformer.

Die Aufgabe wird erfindungsgemäß durch einen Radiator mit den Merkmalen des Anspruchs 1 gelöst.The object is achieved by a radiator with the features of claim 1.

Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the dependent claims.

Ein erfindungsgemäßer Radiator zur Kühlung einer Kühlflüssigkeit eines Transformators umfasst wenigstens einen Kühlkörper, der mehrere parallel zu einer Längsachse des Kühlkörpers verlaufende und voneinander beabstandete Kühlrohre zur Aufnahme von Kühlflüssigkeit aufweist. Jedes Kühlrohr weist wenigstens eine entlang der Längsachse des Kühlkörpers verlaufende Kühlrohrwand, die zur Vergrößerung des von dem Kühlrohr umschlossenen Volumens elastisch verformbar ausgebildet ist, auf. Dabei sind die Kühlrohre voneinander beabstandet entlang einer X-Richtung nebeneinander angeordnet und verlaufen jeweils parallel zu einer in einer Z-Richtung verlaufenden Längsachse des Radiators, so dass je zwei benachbarte Kühlrohre durch einen in der Z-Richtung verlaufenden Trennspalt voneinander getrennt sind. Die Erfindung sieht auch vor, dass wenigstens eine elastisch verformbare Kühlrohrwand zwei entlang der Längsachse des Kühlkörpers verlaufende Randbereiche und einen diese beiden Randbereiche verbindenden elastisch verformbaren Mittelbereich aufweist, wobei der Mittelbereich im unverformten Zustand im Wesentlichen eben ausgebildet ist und jeder Randbereich als zu einer Außenseite der Kühlrohrwand gewölbte Welle mit einem parallel zur Längsachse des Kühlkörpers verlaufenden Wellenkamm ausgebildet ist.A radiator according to the invention for cooling a cooling liquid of a transformer comprises at least one cooling body, which has a plurality of cooling tubes which run parallel to a longitudinal axis of the cooling body and are spaced apart from one another of coolant. Each cooling tube has at least one cooling tube wall running along the longitudinal axis of the cooling body, which is designed to be elastically deformable in order to increase the volume enclosed by the cooling tube. The cooling tubes are spaced apart from one another along an X direction and each run parallel to a longitudinal axis of the radiator running in a Z direction, so that two adjacent cooling tubes are separated from one another by a separating gap running in the Z direction. The invention also provides that at least one elastically deformable cooling tube wall has two edge regions running along the longitudinal axis of the heat sink and an elastically deformable middle region connecting these two edge regions, the central region being essentially flat in the undeformed state and each edge region being to an outside of the Cooling pipe wall curved shaft is formed with a shaft crest running parallel to the longitudinal axis of the heat sink.

Ein derartiger Radiator kann thermische Expansionen der Kühlflüssigkeit durch Vergrößerung der von den Kühlrohren umschlossenen Volumina kompensieren. Bei entsprechender Auslegung des Radiators kann der Radiator dadurch neben der Kühlung der Kühlflüssigkeit auch die Funktion eines Ausdehnungsgefäßes zur Kompensation thermischer Expansionen der Kühlflüssigkeit übernehmen. Ein Transformator mit einem derartig ausgebildeten Radiator benötigt dadurch kein zusätzliches Ausdehnungsgefäß und somit auch keine Kühlflüssigkeitsleitungen zwischen dem Ausdehnungsgefäß und dem Transformatorkessel. Dadurch werden vorteilhaft die Anzahl von Komponenten des Transformators und der dafür benötigte Bauraum sowie der Wartungs- und Reparaturbedarf für diese Komponenten reduziert. Außerdem kann ein Kontakt der Kühlflüssigkeit mit der Umgebung, wie er bei der Verwendung eines Ausdehnungsgefäßes prinzipbedingt eintritt, und eine dadurch verursachte Beeinträchtigung der Kühlflüssigkeit und damit in Kontakt stehender Bauteile vorteilhaft vermieden werden.Such a radiator can compensate for thermal expansion of the cooling liquid by increasing the volume enclosed by the cooling tubes. With a suitable design of the radiator, the radiator can thereby also take on the function of an expansion vessel to compensate for thermal expansion of the cooling liquid in addition to cooling the cooling liquid. As a result, a transformer with a radiator of this type does not require an additional expansion vessel and therefore also no coolant lines between the expansion vessel and the transformer tank. This advantageously reduces the number of components of the transformer and the installation space required for this, as well as the maintenance and repair requirements for these components. In addition, contact of the coolant with the environment, as occurs in principle when using an expansion vessel, and the resulting impairment of the coolant and components in contact therewith can advantageously be avoided.

Die Erfindung ermöglicht vorteilhaft, eine elastisch verformbare Kühlrohrwand auf einfache Weise allein durch die Form der Kühlrohrwand zu realisieren.The invention advantageously makes it possible to implement an elastically deformable cooling tube wall in a simple manner solely through the shape of the cooling tube wall.

Eine Weitergestaltung der vorgenannten Ausgestaltung der Erfindung sieht vor, dass wenigstens ein Kühlrohr zwei sich gegenüber liegende derartig ausgebildete Kühlrohrwände aufweist.A further development of the aforementioned embodiment of the invention provides that at least one cooling tube has two cooling tube walls of this type which are located opposite one another.

Dadurch wird vorteilhaft die durch die elastische Verformung der Kühlrohrwände erzielbare Vergrößerung des von dem Kühlrohr umschlossenen Volumens gegenüber einem Kühlrohr mit nur einer elastisch verformbaren Kühlrohrwand erhöht.As a result, the enlargement of the volume enclosed by the cooling tube by the elastic deformation of the cooling tube walls is advantageously increased compared to a cooling tube with only one elastically deformable cooling tube wall.

Eine Weitergestaltung der vorgenannten Ausgestaltungen der Erfindung sieht vor, dass wenigstens ein Kühlrohr aus zwei sich gegenüber liegenden elastisch verformbaren Kühlrohrwänden der beschriebenen Art besteht, wobei die Randbereiche dieser Kühlrohrwände jeweils in einem parallel zur Längsachse des Kühlkörpers verlaufenden und von dem Mittelbereich der jeweiligen Kühlrohrwand abgewandten Flanschbereich auslaufen, der mit einem korrespondierenden Flanschbereich der anderen Kühlrohrwand kühlflüssigkeitsdicht verbunden ist.A further development of the aforementioned embodiments of the invention provides that at least one cooling tube consists of two elastically deformable cooling tube walls of the type described, the edge regions of these cooling tube walls each in a flange region running parallel to the longitudinal axis of the cooling body and facing away from the central region of the respective cooling tube wall leak, which is connected to a corresponding flange area of the other cooling tube wall in a coolant-tight manner.

Dadurch kann ein Kühlrohr in einfacher und effizienter Weise aus zwei elastisch verformbaren Kühlrohrwänden gefertigt werden, indem diese beiden Kühlrohrwände in ihren Flanschbereichen miteinander verbunden werden.As a result, a cooling tube can be produced in a simple and efficient manner from two elastically deformable cooling tube walls by connecting these two cooling tube walls to one another in their flange regions.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass jede elastisch verformbare Kühlrohrwand aus einem Stahlblech gefertigt ist.Another embodiment of the invention provides that each elastically deformable cooling tube wall is made from a steel sheet.

Dies ermöglicht eine einfach realisierbare Herstellung elastisch verformbarer und dennoch stabiler Kühlrohrwände der vorgenannten Art, da Stahlblech stabil, relativ einfach formbar und bei geeignet gewählter Dicke dennoch elastisch verformbar ist.This enables an easily realizable production of elastically deformable but nevertheless stable cooling tube walls of the aforementioned type, since steel sheet is stable, relatively easy to form and nevertheless can be elastically deformed with a suitably selected thickness.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass jeder Kühlkörper wenigstens einen Kühlflüssigkeitseinlassbereich mit einer Einlassöffnung zum Einlassen von Kühlflüssigkeit in den Kühlkörper aufweist, wobei der Kühlflüssigkeitseinlassbereich mit einem ersten Ende wenigstens eines Kühlrohres zur Leitung von Kühlflüssigkeit aus dem Kühlflüssigkeitseinlassbereich in das Kühlrohr verbunden ist.A further embodiment of the invention provides that each heat sink has at least one coolant inlet region with an inlet opening for inlet of coolant into the heat sink, the coolant inlet region being connected to a first end of at least one cooling tube for guiding coolant from the coolant inlet region into the cooling tube.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass jeder Kühlkörper wenigstens einen Kühlflüssigkeitsauslassbereich mit einer Auslassöffnung zum Auslassen von Kühlflüssigkeit aus dem Kühlkörper aufweist, wobei der Kühlflüssigkeitsauslassbereich mit einem zweiten Ende wenigstens eines Kühlrohres zur Leitung von Kühlflüssigkeit aus dem Kühlrohr in den Kühlflüssigkeitsauslassbereich verbunden ist.A further embodiment of the invention provides that each heat sink has at least one coolant outlet region with an outlet opening for discharging coolant from the heat sink, the coolant outlet region being connected to a second end of at least one cooling tube for guiding coolant from the cooling tube into the coolant outlet region.

Die beiden vorgenannten Ausgestaltungen der Erfindung ermöglichen vorteilhaft die Zufuhr bzw. Abfuhr von Kühlflüssigkeit zu bzw. aus einem Kühlkörper und dessen Kühlrohren über den Kühlflüssigkeitseinlassbereich bzw. den Kühlflüssigkeitsauslassbereich des Kühlkörpers.The two aforementioned embodiments of the invention advantageously enable the supply or removal of cooling liquid to or from a cooling body and its cooling tubes via the cooling liquid inlet area or the cooling liquid outlet area of the cooling body.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass der Radiator mehrere hintereinander angeordnete Kühlkörper aufweist.Another embodiment of the invention provides that the radiator has a plurality of heat sinks arranged one behind the other.

Dadurch kann die Kühlleistung des Radiators vorteilhaft gesteigert und dem jeweiligen Transformator angepasst werden.As a result, the cooling capacity of the radiator can advantageously be increased and adapted to the respective transformer.

Ein erfindungsgemäßer Transformator umfasst einen Transformatorkessel, der wenigstens teilweise mit einer Kühlflüssigkeit befüllbar ist, einen erfindungsgemäßen Radiator zur Kühlung der Kühlflüssigkeit, wenigstens eine erste Verbindungsleitung zur Leitung von Kühlflüssigkeit aus dem Transformatorkessel in den Radiator und wenigstens eine zweite Verbindungsleitung zur Leitung von Kühlflüssigkeit aus dem Radiator in den Transformatorkessel.A transformer according to the invention comprises a transformer tank which can be at least partially filled with a cooling liquid, a radiator according to the invention for cooling the cooling liquid, at least a first connecting line for feeding cooling liquid from the transformer tank into the radiator and at least a second connecting line for feeding cooling liquid from the radiator in the transformer tank.

Wie oben bereits ausgeführt wurde, kann ein derartiger Transformator bei entsprechender Auslegung des Radiators ohne ein Ausdehnungsgefäß zur Kompensation thermischer Expansionen der Kühlflüssigkeit realisiert werden, da der Radiator neben der Kühlung der Kühlflüssigkeit auch die Funktion des Ausdehnungsgefäßes übernimmt, was die oben genannten Vorteile insbesondere hinsichtlich der Reduzierung des Wartungs- und Reparaturbedarfs für den Transformator mit sich bringt.As already stated above, such a transformer can be realized without an expansion vessel to compensate for thermal expansion of the cooling liquid if the radiator is designed accordingly, since the radiator also takes on the function of the expansion tank in addition to cooling the cooling liquid, which has the above-mentioned advantages, particularly with regard to Reduced maintenance and repair needs for the transformer.

Ausgestaltungen eines derartigen Transformators sehen vor, dass der Transformator einen Stufenschalter aufweist, der wenigstens eine Vakuumschaltkammer umfasst, und/oder dass der Transformatorkessel einen gemeinsamen Kühlflüssigkeitsraum für einen Stufenschalter und einen Aktivteil des Transformators aufweist, und/oder dass der Transformator eine Entgasungsvorrichtung zur Abführung von Gas aus dem Transformatorkessel und/oder eine Trocknungsvorrichtung zur Entfeuchtung der Kühlflüssigkeit aufweist.Embodiments of such a transformer provide that the transformer has a tap changer, which comprises at least one vacuum interrupter, and / or that the transformer tank has a common coolant space for a tap changer and an active part of the transformer, and / or that the transformer has a degassing device for removing Has gas from the transformer tank and / or a drying device for dehumidifying the cooling liquid.

Alle diese Ausgestaltungen reduzieren vorteilhaft weiter den Wartungs- und Reparaturbedarf für den Transformator. So sind Stufenschalter mit Vakuumschaltkammern weitgehend wartungsarm, und die Abführung von Gas aus dem Transformatorkessel durch eine Entgasungsvorrichtung sowie die Entfeuchtung der Kühlflüssigkeit durch eine Trocknungsvorrichtung verhindern die Beeinträchtigung der Kühlflüssigkeit und damit in Verbindung stehender Bauteile durch Gas bzw. Feuchtigkeit. Insbesondere ermöglicht ein erfindungsgemäßer Transformator dadurch auch die Verwendung einer biologisch abbaubaren Isolierflüssigkeit, z. B. eines natürlichen oder synthetischen Esters, als Kühlflüssigkeit mit einem akzeptablen Alterungsverhalten.All of these configurations advantageously further reduce the maintenance and repair requirements for the transformer. For example, tap changers with vacuum interrupters are largely low-maintenance, and the removal of gas from the transformer tank by a degassing device and the dehumidification of the cooling liquid by a drying device prevent the cooling liquid and related components from being affected by gas or moisture. In particular, a transformer according to the invention enables this also the use of a biodegradable insulating liquid, e.g. B. a natural or synthetic ester, as a cooling liquid with an acceptable aging behavior.

Die oben beschriebenen Eigenschaften, Merkmale und Vorteile dieser Erfindung sowie die Art und Weise, wie diese erreicht werden, werden klarer und deutlicher verständlich im Zusammenhang mit der folgenden Beschreibung von Ausführungsbeispielen, die im Zusammenhang mit den Zeichnungen näher erläutert werden. Dabei zeigen:

FIG 1
eine Vorderansicht eines Kühlkörpers eines Radiators,
FIG 2
eine transparente perspektivische Teildarstellung des in Figur 1 dargestellten Kühlkörpers,
FIG 3
eine Seitenansicht des in Figur 1 dargestellten Kühlkörpers,
FIG 4
eine transparente Draufsicht auf den in Figur 1 dargestellten Kühlkörper,
FIG 5
einen vergrößerten Ausschnitt der Figur 4,
FIG 6
eine Querschnittsdarstellung eines Kühlrohres, und
FIG 7
schematisch einen Transformator.
The above-described properties, features and advantages of this invention and the manner in which they are achieved can be more clearly understood in connection with the following description of exemplary embodiments, which are explained in more detail in connection with the drawings. Show:
FIG. 1
a front view of a heat sink of a radiator,
FIG 2
a transparent perspective partial representation of the in Figure 1 illustrated heat sink,
FIG 3
a side view of the in Figure 1 illustrated heat sink,
FIG 4
a transparent top view of the in Figure 1 illustrated heat sink,
FIG 5
an enlarged section of the Figure 4 ,
FIG 6
a cross-sectional view of a cooling tube, and
FIG 7
schematically a transformer.

Einander entsprechende Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen.Corresponding parts are provided with the same reference symbols in all figures.

Die Figuren 1 bis 5 zeigen verschiedene Darstellungen eines Kühlkörpers 3 eines Radiators 1 zur Kühlung einer Kühlflüssigkeit eines in Figur 7 schematisch dargestellten Transformators 100, wobei zum besseren Verständnis jeweils auch ein Koordinatensystem mit kartesischen Koordinaten X, Y, Z dargestellt ist. Dabei zeigen Figur 1 eine Vorderansicht des Kühlkörpers 3, Figur 2 eine transparente perspektivische Teildarstellung des Kühlkörpers 3, Figur 3 eine Seitenansicht des Kühlkörpers 3, Figur 4 eine transparente Draufsicht auf den Kühlkörper 3 und Figur 5 einen vergrößerten Ausschnitt der Figur 4. Der Radiator 1 umfasst gemäß einem einfachen Ausführungsbeispiel nur einen derartigen Kühlkörper 3, gemäß anderen Ausführungsbeispielen mehrere derartige Kühlkörper 3, die beispielsweise entlang der Y-Richtung hintereinander angeordnet sind.The Figures 1 to 5 show various representations of a heat sink 3 of a radiator 1 for cooling a cooling liquid in a Figure 7 schematically illustrated transformer 100, a coordinate system with Cartesian coordinates X, Y, Z also being shown for better understanding is. Show Figure 1 a front view of the heat sink 3, Figure 2 a transparent perspective partial representation of the heat sink 3, Figure 3 a side view of the heat sink 3, Figure 4 a transparent top view of the heat sink 3 and Figure 5 an enlarged section of the Figure 4 . According to a simple exemplary embodiment, the radiator 1 comprises only one such heat sink 3, according to other exemplary embodiments a plurality of such heat sinks 3, which are arranged one behind the other for example along the Y direction.

Der Kühlkörper 3 ist flach ausgebildet, so dass er sich im Wesentlichen in einer XZ-Ebene des dargestellten Koordinatensystems erstreckt und in der Y-Richtung eine im Vergleich zu seinen Ausdehnungen in der X-Richtung und der Y-Richtung geringe Ausdehnung hat.The heat sink 3 is flat, so that it extends essentially in an XZ plane of the coordinate system shown and in the Y direction has a small extent in comparison to its dimensions in the X direction and the Y direction.

Der Kühlkörper 3 weist mehrere (im dargestellten Ausführungsbeispiel fünf) Kühlrohre 5 zur Aufnahme von Kühlflüssigkeit auf. Die Kühlrohre 5 sind voneinander beabstandet entlang der X-Richtung nebeneinander angeordnet und verlaufen jeweils parallel zu einer in der Z-Richtung verlaufenden Längsachse des Radiators 1, so dass je zwei benachbarte Kühlrohre 5 durch einen in der Z-Richtung verlaufenden Trennspalt 7 voneinander getrennt sind.The heat sink 3 has a plurality of (five in the exemplary embodiment shown) cooling tubes 5 for receiving cooling liquid. The cooling tubes 5 are spaced apart from one another along the X direction and each run parallel to a longitudinal axis of the radiator 1 extending in the Z direction, so that two adjacent cooling tubes 5 are separated from one another by a separating gap 7 extending in the Z direction .

Oberhalb der Kühlrohre 5 weist der Kühlkörper 3 einen Kühlflüssigkeitseinlassbereich 9 mit einer Einlassöffnung 11 zum Einlassen von Kühlflüssigkeit in den Kühlkörper 3 auf, wobei der Kühlflüssigkeitseinlassbereich 9 mit einem oberen, ersten Ende 13 jedes Kühlrohres 5 zur Leitung von Kühlflüssigkeit aus dem Kühlflüssigkeitseinlassbereich 9 in das Kühlrohr 5 verbunden ist.Above the cooling tubes 5, the cooling body 3 has a cooling fluid inlet region 9 with an inlet opening 11 for the inlet of cooling fluid into the cooling body 3, the cooling fluid inlet region 9 having an upper, first end 13 of each cooling tube 5 for guiding cooling fluid from the cooling fluid inlet region 9 into the cooling tube 5 is connected.

Unterhalb der Kühlrohre 5 weist der Kühlkörper 3 einen Kühlflüssigkeitsauslassbereich 15 mit einer Auslassöffnung 17 zum Auslassen von Kühlflüssigkeit aus dem Kühlkörper 3 auf, wobei der Kühlflüssigkeitsauslassbereich 15 mit einem unteren, zweiten Ende 19 jedes Kühlrohres 5 zur Leitung von Kühlflüssigkeit aus dem Kühlrohr 5 in den Kühlflüssigkeitsauslassbereich 15 verbunden ist.Below the cooling tubes 5, the heat sink 3 has a coolant outlet region 15 with an outlet opening 17 for discharging coolant from the heat sink 3, the coolant outlet region 15 having a lower, second end 19 of each cooling tube 5 is connected to conduct cooling fluid from the cooling tube 5 into the cooling fluid outlet region 15.

Figur 6 zeigt eine Querschnittsdarstellung eines Kühlrohres 5 in einer XY-Ebene. Jedes Kühlrohr 5 besteht aus zwei sich gegenüber liegenden Kühlrohrwänden 21, die beispielsweise jeweils aus einem Stahlblech gefertigt sind. Jede Kühlrohrwand 21 weist zwei in Z-Richtung verlaufende Randbereiche 23 und einen diese beiden Randbereiche 23 verbindenden elastisch verformbaren Mittelbereich 25 auf. Der Mittelbereich 25 ist im unverformten Zustand im Wesentlichen eben ausgebildet. Figure 6 shows a cross-sectional view of a cooling tube 5 in an XY plane. Each cooling tube 5 consists of two opposing cooling tube walls 21, which are each made of sheet steel, for example. Each cooling tube wall 21 has two edge regions 23 running in the Z direction and an elastically deformable central region 25 connecting these two edge regions 23. The central region 25 is essentially flat in the undeformed state.

Jeder Randbereich 23 ist als zu einer Außenseite der Kühlrohrwand 21 gewölbte Welle mit einem in Z-Richtung verlaufenden Wellenkamm ausgebildet. Ferner läuft jeder Randbereich 23 jeweils in einem von dem Mittelbereich 25 der jeweiligen Kühlrohrwand 21 abgewandten Flanschbereich 27 aus, der mit einem korrespondierenden Flanschbereich 27 der anderen Kühlrohrwand 21 kühlflüssigkeitsdicht verbunden, beispielsweise verschweißt, ist.Each edge region 23 is designed as a shaft which is curved to an outside of the cooling tube wall 21 and has a shaft crest running in the Z direction. In addition, each edge region 23 ends in a flange region 27 facing away from the central region 25 of the respective cooling tube wall 21, which flange region is connected, for example welded, to a corresponding flange region 27 of the other cooling tube wall 21.

Der Kühlkörper 3 ist bis auf die Einlassöffnung 11 und die Auslassöffnung 17 kühlflüssigkeitsdicht geschlossen, so dass außer durch die Einlassöffnung 11 und die Auslassöffnung 17 keine Kühlflüssigkeit in den Kühlkörper 3 eintreten kann oder aus dem Kühlkörper 3 austreten kann.The heat sink 3 is closed in a coolant-tight manner except for the inlet opening 11 and the outlet opening 17, so that, apart from through the inlet opening 11 and the outlet opening 17, no coolant can enter or leave the heat sink 3.

Figur 7 zeigt schematisch ein Ausführungsbeispiel eines Transformators 100. Der Transformator 100 umfasst einen Transformatorkessel 102, der wenigstens teilweise mit einer Kühlflüssigkeit befüllbar ist, einen Radiator 1 gemäß einem der oben anhand der Figuren 1 bis 6 beschriebenen Ausführungsbeispiele, eine erste Verbindungsleitung 104 zur Leitung von Kühlflüssigkeit aus dem Transformatorkessel 102 in den Radiator 1 und eine zweite Verbindungsleitung 106 zur Leitung von Kühlflüssigkeit aus dem Radiator 1 in den Transformatorkessel 102. Figure 7 shows schematically an embodiment of a transformer 100. The transformer 100 comprises a transformer tank 102, which can be at least partially filled with a cooling liquid, a radiator 1 according to one of the above using the Figures 1 to 6 Exemplary embodiments described, a first connecting line 104 for guiding coolant from the transformer tank 102 into the radiator 1 and a second connecting line 106 for guiding coolant from the radiator 1 into the transformer tank 102.

Ferner umfasst der Transformator 100 optional einen in dem Transformatorkessel 102 angeordneten Stufenschalter 108 und/oder eine vorzugsweise an einer Oberseite des Transformatorkessels 102 angeordnete Entgasungsvorrichtung 110 und/oder eine an dem Transformatorkessel 102 angeordnete Trocknungsvorrichtung 112. Der Transformatorkessel 102 weist vorzugsweise einen gemeinsamen Kühlflüssigkeitsraum für den Stufenschalter 108 und einen (nicht näher dargestellten) Aktivteil des Transformators 100 auf.Furthermore, the transformer 100 optionally comprises a tap changer 108 arranged in the transformer tank 102 and / or a degassing device 110 preferably arranged on an upper side of the transformer tank 102 and / or a drying device 112 arranged on the transformer tank 102. The transformer tank 102 preferably has a common cooling liquid space for the Step switch 108 and an active part (not shown in detail) of the transformer 100.

Die erste Verbindungsleitung 104 ist beispielsweise als ein zwischen dem Transformatorkessel 102 und dem Radiator 1 verlaufendes Sammelrohr ausgebildet, das an jeden Kühlkörper 3 des Radiators 1 durch eine Öffnung in dem Sammelrohr zu der Einlassöffnung 11 des jeweiligen Kühlkörpers 3 angeschlossen ist. Die zweite Verbindungsleitung 106 ist entsprechend beispielsweise als ein zwischen dem Transformatorkessel 102 und dem Radiator 1 verlaufendes Sammelrohr ausgebildet, das an jeden Kühlkörper 3 des Radiators 1 durch eine Öffnung in dem Sammelrohr zu der Auslassöffnung 17 des jeweiligen Kühlkörpers 3 angeschlossen ist.The first connecting line 104 is designed, for example, as a collecting pipe running between the transformer tank 102 and the radiator 1, which is connected to each heat sink 3 of the radiator 1 through an opening in the collecting pipe to the inlet opening 11 of the respective heat sink 3. The second connecting line 106 is correspondingly designed, for example, as a collecting pipe running between the transformer tank 102 and the radiator 1, which is connected to each heat sink 3 of the radiator 1 through an opening in the collecting pipe to the outlet opening 17 of the respective heat sink 3.

Der Stufenschalter 108 dient der Einstellung eines Spannungsübersetzungsverhältnisses des Transformators 100 und umfasst vorzugsweise wenigstens eine (nicht näher dargestellte) Vakuumschaltkammer. Die Entgasungsvorrichtung 110 dient der Abführung von Gas aus dem Transformatorkessel 102, das z. B. aus der Kühlflüssigkeit ausgast. Die Trocknungsvorrichtung 112 dient der Entfeuchtung der Kühlflüssigkeit.The tap changer 108 is used to set a voltage transformation ratio of the transformer 100 and preferably comprises at least one vacuum interrupter (not shown in more detail). The degassing device 110 serves to discharge gas from the transformer tank 102, which, for. B. outgassed from the coolant. The drying device 112 serves to dehumidify the cooling liquid.

Der Transformator 100 umfasst insbesondere kein zusätzliches Ausdehnungsgefäß zur Aufnahme von Kühlflüssigkeit aus dem Transformatorkessel 102 im Falle einer thermischen Expansion von Kühlflüssigkeit im Transformatorkessel 102. Die Funktion eines derartigen Ausdehnungsgefäßes wird von dem Radiator 1 übernommen, der derartige thermische Expansionen der Kühlflüssigkeit durch Vergrößerungen der von den Kühlrohren 5 des Radiators 1 umschlossenen Volumina durch elastische Verformungen der Kühlrohrwände 21 der Kühlrohre 5 kompensiert.In particular, the transformer 100 does not include an additional expansion vessel for receiving cooling liquid from the transformer tank 102 in the event of a thermal expansion of cooling liquid in the transformer tank 102. The function of such an expansion tank is taken over by the radiator 1, which expands the cooling liquid in this way by increasing the thermal expansion of the Cooling tubes 5 des Radiator 1 enclosed volumes compensated by elastic deformations of the cooling tube walls 21 of the cooling tubes 5.

Andere Ausführungsbeispiele eines Transformators 100 umfassen mehrere Radiatoren 1, die beispielsweise an verschiedenen Seiten des Transformatorkessels 102 angeordnet sind, und/oder mehrere Verbindungsleitungen 104, 106 zur Leitung von Kühlflüssigkeit zwischen dem Transformatorkessel 102 und dem Radiator 1 oder den Radiatoren 1.Other exemplary embodiments of a transformer 100 include a plurality of radiators 1, which are arranged, for example, on different sides of the transformer tank 102, and / or a plurality of connecting lines 104, 106 for conducting coolant between the transformer tank 102 and the radiator 1 or the radiators 1.

Obwohl die Erfindung im Detail durch bevorzugte Ausführungsbeispiele näher illustriert und beschrieben wurde, so ist die Erfindung nicht durch die offenbarten Beispiele eingeschränkt und andere Variationen können vom Fachmann hieraus abgeleitet werden, ohne den Schutzumfang der Erfindung zu verlassen.Although the invention has been illustrated and described in detail by means of preferred exemplary embodiments, the invention is not restricted by the disclosed examples and other variations can be derived therefrom by the person skilled in the art without departing from the scope of protection of the invention.

Claims (12)

  1. Radiator (1) for cooling a cooling liquid of a transformer (100), the radiator (1) comprising
    - at least one heat sink (3) having a plurality of cooling pipes (5) which run parallel to a longitudinal axis of the heat sink (3), are spaced apart from one another and are intended to hold cooling liquid,
    - wherein each cooling pipe (5) has at least one cooling pipe wall (21) which runs along the longitudinal axis of the heat sink (3) and is elastically deformable in order to increase the volume enclosed by the cooling pipe (5),
    wherein
    - the cooling pipes (5) are arranged beside one another in a manner spaced apart from one another along an X direction and each run parallel to a longitudinal axis of the radiator (1) running in a Z direction, with the result that each two adjacent cooling pipes (5) are separated from one another by a separating gap (7) running in the Z direction, characterized in that
    at least one elastically deformable cooling pipe wall (21) has two edge regions (23) running along the longitudinal axis of the heat sink (3) and an elastically deformable central region (25) connecting these two edge regions (23), wherein the central region (25) is substantially flat in the undeformed state, and each edge region (23) is in the form of a wave which is curved towards an outer side of the cooling pipe wall (21) and has a crest of a wave running parallel to the longitudinal axis of the heat sink (3).
  2. Radiator (1) according to Claim 1, characterized in that at least one cooling pipe (5) has two opposite cooling pipe walls (21).
  3. Radiator (1) according to Claim 2, characterized in that the edge regions (23) each end in a flange region (27) which runs parallel to the longitudinal axis of the heat sink (3), faces away from the central region (25) of the respective cooling pipe wall (21) and is connected to a corresponding flange region (27) of the other cooling pipe wall (21) in a cooling-liquid-tight manner.
  4. Radiator (1) according to one of the preceding claims, characterized in that each elastically deformable cooling pipe wall (21) is produced from sheet steel.
  5. Radiator (1) according to one of the preceding claims, characterized in that each heat sink (3) has at least one cooling liquid inlet region (9) with an inlet opening (11) for letting cooling liquid into the heat sink (3), wherein the cooling liquid inlet region (9) is connected to a first end (13) of at least one cooling pipe (5) for guiding cooling liquid from the cooling liquid inlet region (9) into the cooling pipe (5).
  6. Radiator (1) according to one of the preceding claims, characterized in that each heat sink (3) has at least one cooling liquid outlet region (15) with an outlet opening (17) for letting cooling liquid out of the heat sink (3), wherein the cooling liquid outlet region (15) is connected to a second end (19) of at least one cooling pipe (5) for guiding cooling liquid from the cooling pipe (5) into the cooling liquid outlet region (15).
  7. Radiator (1) according to one of the preceding claims, characterized by a plurality of heat sinks (3) arranged behind one another.
  8. Transformer (100) comprising
    - a transformer tank (102) which can be at least partially filled with a cooling liquid,
    - a radiator (1) according to one of the preceding claims for cooling the cooling liquid,
    - at least one first connecting line (104) for guiding cooling liquid from the transformer tank (102) into the radiator (1),
    - and at least one second connecting line (106) for guiding cooling liquid from the radiator (1) into the transformer tank (102).
  9. Transformer (100) according to Claim 8, characterized by a tap changer (108) which comprises at least one vacuum switching chamber.
  10. Transformer (100) according to Claim 8 or 9, characterized in that the transformer tank (102) has a common cooling liquid space for a tap changer (108) and an active part of the transformer (100).
  11. Transformer (100) according to one of Claims 8 to 10, characterized by a degassing apparatus (110) for discharging gas from the transformer tank (102).
  12. Transformer (100) according to one of Claims 8 to 11, characterized by a drying apparatus (112) for dehumidifying the cooling liquid.
EP14186769.7A 2014-09-29 2014-09-29 Radiator for cooling a coolant liquid of a transformer Active EP3001434B1 (en)

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EP3822568A1 (en) 2019-11-14 2021-05-19 Siemens Energy Global GmbH & Co. KG Radiator for cooling a transformer or a choke
DE102021129095A1 (en) * 2021-11-09 2023-05-11 Audi Aktiengesellschaft Cooling device with cooling sections and stabilized transition sections, battery assembly with cooling device and motor vehicle

Citations (1)

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Publication number Priority date Publication date Assignee Title
GB879200A (en) * 1956-10-31 1961-10-04 Washington Engineering Ltd Improvements in or relating to tubular heat exchangers

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Publication number Priority date Publication date Assignee Title
DE1971624U (en) * 1967-07-12 1967-11-02 Paul Gatterbauer APPARATUS CONTAINER IN CLOSED PRESSURE SEAL CONSTRUCTION.
JPS5249418A (en) * 1975-10-17 1977-04-20 Kozo Shiaku Conservator panel peplacing conservator of oil-immersed transformer
DE10010737C2 (en) * 2000-03-04 2002-01-10 Alstom Paris Radiator for an electrical transformer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB879200A (en) * 1956-10-31 1961-10-04 Washington Engineering Ltd Improvements in or relating to tubular heat exchangers

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