EP2463871A1 - Amorphous transformer core - Google Patents
Amorphous transformer core Download PDFInfo
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- EP2463871A1 EP2463871A1 EP10193977A EP10193977A EP2463871A1 EP 2463871 A1 EP2463871 A1 EP 2463871A1 EP 10193977 A EP10193977 A EP 10193977A EP 10193977 A EP10193977 A EP 10193977A EP 2463871 A1 EP2463871 A1 EP 2463871A1
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- Prior art keywords
- transformer core
- amorphous
- core
- heat
- amorphous transformer
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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
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
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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
- H01F27/24—Magnetic cores
- H01F27/25—Magnetic cores made from strips or ribbons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
- H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons
Definitions
- the invention relates to an amorphous transformer core comprising at least one transformer core disk having a plurality of layers of a ribbon-like amorphous core material arranged concentrically around at least one winding window.
- amorphous materials require new constructions and processing because, on the one hand, because of the lower flux density compared to a conventional transformer core, larger core cross-sections are required and, on the other hand, an amorphous core material is more sensitive to higher temperatures than a grain-oriented core sheet.
- transformer cores are made of a thin amorphous strip material, which in a plurality of layers, for example some a thousand, is arranged concentrically around one or even around several winding windows, wherein a sheet usually covers a position, ie a circumferential angle of about 360 °, wherein, if necessary, a slight overlap is realized.
- a support structure is usually required, by which the core structure is stabilized.
- the amorphous material usually available as a flat strip material is mechanically very sensitive. The available widths of the strip material are limited, for example to 200mm. The mechanically realizable sizes of a transformer core are thus limited. Therefore, to realize larger amorphous transformer cores, a plurality of congruent transformer core disks whose width is limited by the width of the available tape material may be juxtaposed and interconnected.
- the basic idea of the invention is to produce a heat accumulation which arises in the interior of an amorphous transformer core, which leads there to an undesired increase in temperature with a concomitant deterioration of the material properties, into the interior of the core dissipate introduced ontoableitbleche outward.
- the politiciansableitbleche are made of a material with high thermal conductivity, which is higher in any case than that of the amorphous strip material.
- the core cross-section can be carried out advantageously lower.
- Heat sinks are due to the construction of an amorphous transformer core of a multi-layered thin amorphous ribbon material with a limited width during its production particularly well in the interior of the transformer core to bring because it is not constructed quasi-monolithic as a standard transformer transformer core.
- At least one end of such a Cyprusableitbleches is guided to a, preferably near the core, heat exchanger area.
- a heat exchanger area This is ideally designed such that the highest possible surface is provided for heat exchange, for example by a cooling rib-like design.
- the heat is transferred from the heat exchanger area to the environment by means of natural convection.
- a forced cooling is conceivable.
- the at least one heat dissipation sheet at least partially disposed between two adjacent layers of the ribbon-like amorphous core material and led out of at least one side surface of the amorphous transformer core or the amorphous transformer core.
- An amorphous transformer core is usually prefabricated from a plurality of layers of amorphous ribbon-like core material. This is to open in the manufacture of a transformer to arrange the transformer windings on formed from the strip material core legs.
- an amorphous core sheet usually comprises a 360 ° rotation.
- the joints of the respective sheets are usually provided in one of the formed yokes, which also represents the respective opening point.
- the latter comprises at least two transformer core disks arranged parallel to one another and at least approximately congruent to one another, at least one heat dissipation sheet being arranged at least in sections between the adjacent transformer core disks.
- Transformer cores for higher power ratings for example, in the range of 1 MVA and also significantly higher, are usually composed of several core disks due to the limited width of the available ribbon-like amorphous core material.
- the cooling problem and in particular an inhomogeneous temperature distribution are of particular importance here.
- heat sinks are disposed between two respective leg-like regions of adjacent transformer core disks.
- the transformer is arranged with the core in later operation.
- the core disks are arranged vertically, so that the interposed nickelableitbleche perpendicular and in a open above the transformer provided heat exchange zone.
- a transformer but also with lying amorphous core can be arranged.
- the amorphous transformer core in a further embodiment possibility of the amorphous transformer core according to the invention, this is mechanically stabilized by the at least one heat dissipation plate arranged between the congruently adjacent transformer core disks.
- the heat conduction has a certain thickness, for example 1mm to 15mm, depending on the size and weight of the amorphous transformer core.
- Conventional réelleableitbleche can also be quite in the range of a thickness of 0.5mm and below.
- a plurality of adjacent at least partially arranged are provided.
- the use of several politiciansableitbleche allows on the one hand their homogeneous distribution as possible within the amorphous transformer core, which also a further homogenized temperature distribution is achieved during operation.
- these sheets are to lead to a common heat exchange region above the transformer core, for which, in particular in the presence of multiple transformer core disks the area between the core discs offers that runs vertically upwards. In order to form a compact as possible strand, within which the heat dissipation plates are guided upwards, they are therefore to be guided parallel to each other.
- a common heat exchange region permits, in particular, simple forced cooling, for example by means of a blower or a heat exchanger.
- a single device is enough to cool the single heat exchange area.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Transformer Cooling (AREA)
- Coils Of Transformers For General Uses (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Die Erfindung betrifft einen amorphen Transformatorkern, umfassend wenigstens eine Transformatorkernscheibe mit einer Vielzahl an konzentrisch um wenigstens ein Wickelfenster angeordneten Lagen aus einem bandartigen amorphen Kernmaterial.The invention relates to an amorphous transformer core comprising at least one transformer core disk having a plurality of layers of a ribbon-like amorphous core material arranged concentrically around at least one winding window.
Es ist allgemein bekannt, dass Transformatoren für Energieübertragung, beispielsweise in einer Spannungsebene von 10kV bis 110kV und darüber, im laufenden Betrieb Kernverluste produzieren. Diese Verluste sind überwiegend auf die Ummagnetisierungsverluste oder auch Hystereseverluste des üblicherweise verwendeten geblechten Eisenkerns zurückzuführen und verursachen eine Erwärmung desselben. Um diese unerwünschten Verluste zu reduzieren werden seit kürzerem auch Transformatoren mit Kernen aus amorphem Material gebaut, welche sich durch reduzierte Kernverlustleistungen auszeichnen.It is well known that transformers for power transmission, for example, at a voltage level of 10kV to 110kV and above, produce core losses during operation. These losses are predominantly due to the re-magnetization losses or hysteresis losses of the commonly used laminated iron core and cause a heating of the same. To reduce these unwanted losses, transformers with cores of amorphous material have also been built recently, which are characterized by reduced core power losses.
Allerdings erfordert die Verwendung von amorphen Werkstoffen neue Konstruktionen und Verarbeitungsweisen, da einerseits aufgrund der im Vergleich zu einem konventionellen Transformatorkern geringeren Flussdichte größere Kernquerschnitte notwendig sind, und andererseits ein amorphes Kernmaterial empfindlicher gegenüber höheren Temperaturen ist als ein kornorientiertes Kernblech.However, the use of amorphous materials requires new constructions and processing because, on the one hand, because of the lower flux density compared to a conventional transformer core, larger core cross-sections are required and, on the other hand, an amorphous core material is more sensitive to higher temperatures than a grain-oriented core sheet.
Üblicherweise werden derartige Transformatorkerne aus einem dünnen amorphen Bandmaterial gefertigt, welches in einer Vielzahl von Lagen, beispielsweise einige tausend, konzentrisch um ein beziehungsweise auch um mehrere Wickelfenster angeordnet ist, wobei ein Blech üblicherweise eine Lage, also einen Umlaufwinkel von etwa 360°, abdeckt, wobei bedarfsweise auch eine geringfügige Überlappung realisiert ist. Hierbei ist zumeist eine Stützkonstruktion erforderlich, durch welche der Kernaufbau stabilisiert wird. Zudem ist das üblicherweise als Flachbandmaterial lieferbare amorphe Material mechanisch sehr empfindlich. Die lieferbaren Breiten des Bandmaterials sind begrenzt, beispielsweise auf 200mm. Auch die mechanisch realisierbaren Baugrößen eines Transformatorkerns sind somit beschränkt. Daher können zur Realisierung größerer amorpher Transformatorkerne mehrere kongruente Transformatorkernscheiben, deren Breite durch die Breite des verfügbaren Bandmaterials begrenzt ist, nebeneinander angeordnet und miteinander verbunden werden.Usually, such transformer cores are made of a thin amorphous strip material, which in a plurality of layers, for example some a thousand, is arranged concentrically around one or even around several winding windows, wherein a sheet usually covers a position, ie a circumferential angle of about 360 °, wherein, if necessary, a slight overlap is realized. Here, a support structure is usually required, by which the core structure is stabilized. In addition, the amorphous material usually available as a flat strip material is mechanically very sensitive. The available widths of the strip material are limited, for example to 200mm. The mechanically realizable sizes of a transformer core are thus limited. Therefore, to realize larger amorphous transformer cores, a plurality of congruent transformer core disks whose width is limited by the width of the available tape material may be juxtaposed and interconnected.
Nachteilig ist jedoch, dass bei amorphen Kernen die Kühlung des Kerns von größerer Bedeutung ist als bei Kernen aus kornorientiertem Kernblech, da die Sättigungsinduktion und somit die Nenninduktion von der Betriebstemperatur stark abhängt. Mit steigender Temperatur sinkt die mögliche Nenninduktion. Dies muss dann durch einen erhöhten Materialeinsatz kompensiert werden.The disadvantage, however, is that with amorphous cores, the cooling of the core is of greater importance than in nuclei of grain-oriented core sheet, since the saturation induction and thus the Nenninduktion of the operating temperature strongly depends. With increasing temperature the possible nominal induction decreases. This must then be compensated by an increased use of materials.
Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, einen amorphen Transformatorkern mit verbesserter Kühlung beziehungsweise Wärmeableitfähigkeit bereitzustellen, um einen solchen erhöhten Materialeinsatz zu vermeiden.Based on this prior art, it is an object of the invention to provide an amorphous transformer core with improved cooling or heat dissipation in order to avoid such an increased use of materials.
Diese Aufgabe wird gelöst durch einen amorphen Transformatorkern der eingangs genannten Art. Dieser ist dadurch gekennzeichnet, dass wenigstens ein Wärmeableitblech in das Innere des amorphen Transformatorkerns hineinreicht und dass dieses von dort in wenigstens einen Wärmetauschbereich außerhalb des amorphen Transformatorkerns geführt ist, so dass eine verbesserte Ableitung von innerhalb des amorphen Transformatorkerns anfallender Wärmeenergie ermöglicht ist.This object is achieved by an amorphous transformer core of the type mentioned at the outset. This is characterized in that at least one heat dissipation sheet extends into the interior of the amorphous transformer core and is guided from there into at least one heat exchange region outside the amorphous transformer core, so that an improved dissipation is made possible by occurring within the amorphous transformer core heat energy.
Die Grundidee der Erfindung besteht darin, einen während des Betriebes eines amorphen Transformatorkerns in dessen Innerem entstehenden Wärmestau, welcher dort zu einer unerwünschten Temperaturerhöhung mit einer damit einhergehenden Verschlechterung der Materialeigenschaften führt, durch in das Innere des Kerns eingebrachte Wärmeableitbleche nach außen abzuleiten. Die Wärmeableitbleche sind aus einem Material mit hoher Wärmeleitfähigkeit, welche in jedem Fall höher ist als die des amorphen Bandmaterials. Je nach Anordnung und Verteilung der Wärmeableitbleche im Kerninneren werden damit eine bessere Kühlung und eine homogenere Temperaturverteilung im Kerninneren erreicht. Der Kernquerschnitt kann dadurch in vorteilhafter Weise geringer ausgeführt werden. Wärmeableitbleche sind aufgrund des Aufbaus eines amorphen Transformatorkerns aus einem viellagigen dünnen amorphen Bandmaterial mit einer limitierten Breite während dessen Fertigung besonders gut in das Innere des Transformatorkerns einzubringen, weil dieser nicht quasi-monolithisch aufgebaut ist wie ein geblechter Standardtransformatorkern.The basic idea of the invention is to produce a heat accumulation which arises in the interior of an amorphous transformer core, which leads there to an undesired increase in temperature with a concomitant deterioration of the material properties, into the interior of the core dissipate introduced Wärmeableitbleche outward. The Wärmeableitbleche are made of a material with high thermal conductivity, which is higher in any case than that of the amorphous strip material. Depending on the arrangement and distribution of Wärmeableitbleche inside the core so that better cooling and a more homogeneous temperature distribution inside the core can be achieved. The core cross-section can be carried out advantageously lower. Heat sinks are due to the construction of an amorphous transformer core of a multi-layered thin amorphous ribbon material with a limited width during its production particularly well in the interior of the transformer core to bring because it is not constructed quasi-monolithic as a standard transformer transformer core.
Wenigstens ein Ende eines solchen Wärmeableitbleches ist zu einem, vorzugsweise kernnahen, Wärmetauscherbereich geführt. Dieser ist idealerweise derart gestaltet, dass eine möglichst hohe Oberfläche zum Wärmetausch bereitgestellt ist, beispielsweise durch eine kühlrippenähnliche Ausgestaltung. Selbstverständlich ist es auch denkbar, die Wärmeableitbleche mit einem Kühlkörper zu verbinden. Vorzugsweise erfolgt die Wärmeabgabe vom Wärmetauscherbereich an die Umgebung mittels natürlicher Konvektion. Selbstverständlich ist aber auch eine forcierte Kühlung denkbar.At least one end of such a Wärmeableitbleches is guided to a, preferably near the core, heat exchanger area. This is ideally designed such that the highest possible surface is provided for heat exchange, for example by a cooling rib-like design. Of course, it is also conceivable to connect the Wärmeableitbleche with a heat sink. Preferably, the heat is transferred from the heat exchanger area to the environment by means of natural convection. Of course, however, a forced cooling is conceivable.
Entsprechend einer bevorzugten Ausgestaltung des erfindungsgemäßen amorphen Transformatorkerns ist das wenigstens eine Wärmeableitblech zumindest abschnittsweise zwischen zwei benachbarten Lagen des bandartigen amorphen Kernmaterials angeordnet und aus wenigstens einer Seitenfläche des amorphen Transformatorkerns beziehungsweise der amorphen Transformatorkernscheibe herausgeführt. Eine amorphe Transformatorkernscheibe ist zumeist aus einer Vielzahl von Lagen amorphen bandartigen Kernmaterials vorkonfektioniert. Diese ist bei der Fertigung eines Transformators zu öffnen, um die Transformatorwicklungen über aus dem Bandmaterial gebildete Kernschenkel anzuordnen. Wie eingangs erwähnt umfasst ein amorphes Kernblech üblicherweise einen Umlauf von 360°. Die Stossstellen der jeweiligen Bleche sind zumeist in einem der gebildeten Joche vorgesehen, welches auch die jeweilige Öffnungsstelle darstellt. Beim Schließen des Transformatorkerns beziehungsweise der Transformatorkernscheibe werden Pakete von einigen 10 bis 100 und auch mehr Lagen wechselseitig zugeschichtet, so dass bei diesem Vorgang einfach Wärmeableitbleche zwischen die Lagenpakete eingefügt werden können. Durch die flächige Kontaktierung der jeweiligen Wärmeableitbleche mit den angrenzenden Lagen des bandartigen amorphen Kernmaterials ist ein guter Wärmeübergang sichergestellt. Insofern ein Material für die Wärmeableitbleche verwendet wird, welches magnetische Eigenschaften aufweiset, und derartige Wärmeleitbleche in den Stossbereich von jeweiligen Lagenpakten angeordnet werden, werden dort eventuell vorhandene magnetische Schwachstellen des amorphen Kernes in vorteilhafter Weise kompensiert. Zur Verringerung eventueller Wirbelstromverluste in den Wärmeableitblechen ist es möglich, diese geschlitzt oder in Form von mehreren, elektrisch gegeneinander isolierten, aneinandergrenzenden Streifen aufzubauen. Deren Wärmeleitfähigkeit wird dadurch nicht signifikant beeinflusst. So ist auf einfache Weise ein amorpher Transformatorkern mit einer verbesserten Wärmeabfuhr aus dessen Innerem gefertigt.According to a preferred embodiment of the amorphous transformer core according to the invention, the at least one heat dissipation sheet at least partially disposed between two adjacent layers of the ribbon-like amorphous core material and led out of at least one side surface of the amorphous transformer core or the amorphous transformer core. An amorphous transformer core is usually prefabricated from a plurality of layers of amorphous ribbon-like core material. This is to open in the manufacture of a transformer to arrange the transformer windings on formed from the strip material core legs. As mentioned above, an amorphous core sheet usually comprises a 360 ° rotation. The joints of the respective sheets are usually provided in one of the formed yokes, which also represents the respective opening point. When closing the transformer core or the transformer core disk packages of some 10 to 100 and more layers are mutually superimposed, so that in this process simply heat dissipating between the layer packages can be inserted. The areal contacting of the respective heat dissipating plates with the adjacent layers of the ribbon-like amorphous core material ensures good heat transfer. Insofar as a material is used for the heat-dissipating plates, which has magnetic properties, and such heat-conducting plates are arranged in the joint area of respective layer pacts, any possible magnetic weak points of the amorphous core are compensated there in an advantageous manner. In order to reduce any eddy current losses in the heat sinks, it is possible to slit these or built in the form of several, mutually electrically isolated, adjacent strips. Their thermal conductivity is not significantly affected by this. Thus, an amorphous transformer core with improved heat dissipation from its interior is manufactured in a simple manner.
Gemäß einer weiteren Erfindungsvariante ist das wenigstens eine Wärmeableitblech an wenigstens einer Seitenfläche der Transformatorkernscheibe abgewinkelt. Dies ermöglicht eine platzsparende Führung der Wärmeableitbleche zu einer ebenfalls platzsparend oberhalb des Transformators vorgesehenen Wärmetauschzone.According to a further variant of the invention, the at least one heat dissipation sheet is angled on at least one side surface of the transformer core disk. This allows a space-saving guidance of the heat sinks to a likewise space-saving above the transformer provided heat exchange zone.
Einer besonders bevorzugten Variante des erfindungsgemäßen Transformatorkerns folgend umfasst dieser wenigstens zwei parallel und zumindest annährend kongruent benachbart zueinander angeordnete Transformatorkernscheiben, wobei wenigstens ein Wärmeableitblech zumindest abschnittsweise zwischen den benachbarten Transformatorkernscheiben angeordnet ist. Transformatorkerne für höhere Nennleistungen, beispielsweise im Bereich von 1 MVA und auch deutlich höher, sind aufgrund der begrenzten Breite des verfügbaren bandartigen amorphen Kernmaterials zumeist aus mehreren Kernscheiben zusammenzusetzen. Zudem sind hier die Kühlproblematik und insbesondere auch eine inhomogene Temperaturverteilung von besonderer Bedeutung.Following a particularly preferred variant of the transformer core according to the invention, the latter comprises at least two transformer core disks arranged parallel to one another and at least approximately congruent to one another, at least one heat dissipation sheet being arranged at least in sections between the adjacent transformer core disks. Transformer cores for higher power ratings, for example, in the range of 1 MVA and also significantly higher, are usually composed of several core disks due to the limited width of the available ribbon-like amorphous core material. In addition, the cooling problem and in particular an inhomogeneous temperature distribution are of particular importance here.
Idealerweise sind Wärmeableitbleche zwischen zwei jeweiligen schenkelähnlich ausgeprägten Bereichen von benachbarten Transformatorkernscheiben angeordnet. Üblicherweise ist der Transformator im späteren Betrieb mit stehendem Kern angeordnet. In diesem Fall sind auch die Kernscheiben senkrecht angeordnet, so dass auch die dazwischen angeordneten Wärmeableitbleche senkrecht verlaufen und in eine oberhalb des Transformators vorgesehene Wärmetauschzone münden. Selbstverständlich ist ein Transformator aber auch mit liegendem amorphem Kern anordenbar. Unter Voraussetzung von ebenen Seitenflächen der Transformatorkernscheiben erfolgt ein flächiger Wärmeübergang über die Seitenflächen des bandartigen amorphen Bandmaterials auf das jeweils angrenzende Wärmeableitblech.Ideally, heat sinks are disposed between two respective leg-like regions of adjacent transformer core disks. Usually, the transformer is arranged with the core in later operation. In this case, the core disks are arranged vertically, so that the interposed Wärmeableitbleche perpendicular and in a open above the transformer provided heat exchange zone. Of course, a transformer but also with lying amorphous core can be arranged. On the assumption of flat side surfaces of the transformer core disks, there is a surface heat transfer via the side surfaces of the ribbon-like amorphous strip material to the respective adjacent heat dissipation sheet.
In einer weiteren Ausgestaltungsmöglichkeit des erfindungsgemäßen amorphen Transformatorkerns ist dieser durch das wenigstens eine zwischen den kongruent benachbarten Transformatorkernscheiben angeordnete Wärmeableitblech mechanisch stabilisiert. Hierzu ist es erforderlich, dass das Wärmeleitblech eine bestimmte Dicke, beispielsweise 1mm bis 15mm aufweist, je nach Größe und Gewicht des amorphen Transformatorkerns. Übliche Wärmeableitbleche können auch durchaus im Bereich einer Dicke von 0,5mm und darunter liegen. So ist es beispielsweise möglich, ein senkrecht in einem Schenkelbereich angeordnetes Wärmeableitblech im unteren Bereich mit einem quer verlaufenden Trägerblech zu versehen, so dass sich eine T-Form ergibt. Dies würde beispielsweise ermöglichen, die jeweiligen angrenzenden Transformatorkernscheiben von unten auf den so gebildeten Querbalken abzustützen. Ebenso ist es aber ohne weiteres denkbar, ein derartiges Wärmeableitblech mit den angrenzenden Seitenflächen der Transformatorkernscheiben zu verkleben und diese so zu stabilisieren. Hierzu ist vorzugsweise ein Klebstoff mit einer hohen Wärmeleitfähigkeit zu verwenden, beispielsweise mit einem Zusatz an Bornitrid, welches ein hervorragender Wärmeleiter ist. Entsprechend einer weiteren Erfindungsvariante ist es auch vorgesehen, im oberen Bereich des Wärmeableitbleches eine Haltevorrichtung vorzusehen, beispielsweise eine Öse, mittels welcher der Transformator durch einen Kran oder eine ähnliche Hebevorrichtung angehoben werden kann. Hierdurch wird die Handhabung des Transformatorkerns vereinfacht.In a further embodiment possibility of the amorphous transformer core according to the invention, this is mechanically stabilized by the at least one heat dissipation plate arranged between the congruently adjacent transformer core disks. For this purpose, it is necessary that the heat conduction has a certain thickness, for example 1mm to 15mm, depending on the size and weight of the amorphous transformer core. Conventional Wärmeableitbleche can also be quite in the range of a thickness of 0.5mm and below. Thus, it is possible, for example, to provide a vertically arranged in a leg region Wärmeableitblech in the lower region with a transverse support plate, so that there is a T-shape. This would allow, for example, to support the respective adjacent transformer core disks from below on the crossbar thus formed. Likewise, however, it is readily conceivable to bond such a heat dissipation sheet to the adjacent side surfaces of the transformer core disks and to stabilize them in this way. For this purpose, it is preferable to use an adhesive with a high thermal conductivity, for example with an addition of boron nitride, which is an excellent conductor of heat. According to a further variant of the invention, it is also provided to provide a holding device in the upper region of the heat-dissipating plate, for example an eyelet, by means of which the transformer can be lifted by a crane or a similar lifting device. This simplifies the handling of the transformer core.
Gemäß einer weiteren Ausführungsvariante sind mehrere zumindest abschnittsweise benachbart angeordnete Wärmeableitbleche vorgesehen. Die Verwendung mehrerer Wärmeableitbleche ermöglicht einerseits deren möglichst homogene Verteilung innerhalb des amorphen Transformatorkerns, womit auch eine weiter homogenisierte Temperaturverteilung im Betrieb erreicht ist. Vorzugsweise sind diese Bleche aber zu einem gemeinsamen Wärmetauschbereich oberhalb des Transformatorkerns zu führen, wofür sich insbesondere bei Vorhandensein von mehreren Transformatorkernscheiben der Bereich zwischen den Kernscheiben anbietet, der senkrecht nach oben verläuft. Um einen möglichst kompakten Strang zu bilden, innerhalb dessen die Wärmeableitbleche nach oben geführt sind, sind diese demgemäß parallel zueinander zu führen.According to a further embodiment, a plurality of adjacent at least partially arranged Wärmeableitbleche are provided. The use of several Wärmeableitbleche allows on the one hand their homogeneous distribution as possible within the amorphous transformer core, which also a further homogenized temperature distribution is achieved during operation. Preferably, however, these sheets are to lead to a common heat exchange region above the transformer core, for which, in particular in the presence of multiple transformer core disks the area between the core discs offers that runs vertically upwards. In order to form a compact as possible strand, within which the heat dissipation plates are guided upwards, they are therefore to be guided parallel to each other.
Ein gemeinsamer Wärmetauschbereich ermöglicht nämlich gemäß einer weiteren Erfindungsvariante insbesondere eine einfache forcierte Kühlung, beispielsweise mittels eines Gebläses oder eines Wärmetauschers. In diesem Fall reicht ein einziges Gerät, um den einzigen Wärmetauschbereich forciert zu kühlen.Namely, according to a further variant of the invention, a common heat exchange region permits, in particular, simple forced cooling, for example by means of a blower or a heat exchanger. In this case, a single device is enough to cool the single heat exchange area.
Zur weiteren Steigerung der Wärmeabfuhr aus dem Inneren des amorphen Transformatorkerns ist es vorgesehen, das wenigstens eine Wärmeableitblech überwiegend aus dem Metall Kupfer oder Aluminium zu fertigen, welche sich durch eine besonders hohe Wärmeleitfähigkeit auszeichnen und zudem noch eine genügend hohe mechanische Stabilität aufweisen.To further increase the heat dissipation from the interior of the amorphous transformer core, it is provided to manufacture the at least one heat dissipation sheet mainly from the metal copper or aluminum, which are characterized by a particularly high thermal conductivity and also have a sufficiently high mechanical stability.
Insbesondere für den Fall, dass zwischen einer Vielzahl einzelner Lagen des band-ähnlichen amorphen Materials ein jeweiliges Wärmeableitblech vorgesehen ist, wird vorgeschlagen, dieses folienartig, also besonders dünn auszuführen, beispielsweise mit einer Dicke von 50µm. Hierdurch wird eine besonders homogene Wärmeableitung aus dem Inneren des amorphen Transformatorkerns ermöglicht. Insoweit die folienartigen Wärmeleitbleche mit einer elektrischen Isolationsschicht versehen sind, werden hierdurch in vorteilhafter Weise eventuelle ― wenn auch ohnehin bereits marginale ― Wirbelstromverluste weiter reduziert.In particular, in the event that a respective heat sink is provided between a plurality of individual layers of the band-like amorphous material, it is proposed that this film-like, so perform particularly thin, for example, with a thickness of 50 microns. This allows a particularly homogeneous heat dissipation from the interior of the amorphous transformer core. Insofar as the foil-like heat conducting sheets are provided with an electrical insulation layer, this advantageously further reduces possible eddy current losses, albeit already marginal in any case.
Eine nochmalige Steigerung der Wärmeableitung wird erfindungsgemäß dadurch erreicht, dass das wenigstens eine Wärmeableitblech in einem flächigen Kontaktflächenbereich mit dem bandartigen amorphen Kernmaterial mit einer Wärmeleitpaste versehen ist oder auch dadurch, dass wenigstens ein Wärmeableitblech in einem flächigen Kontaktflächenbereich mit dem bandartigem amorphen Kernmaterial mittels eines vorzugsweise gut wärmeleitfähigen Klebstoffes verbunden ist. In beiden Fällen wird der Wärmeübergang von der jeweiligen Transformatorkernscheibe zum Wärmeableitblech in vorteilhafter Weise verbessert.A further increase in the heat dissipation is inventively achieved in that the at least one heat sink is provided in a flat contact surface area with the ribbon-like amorphous core material with a thermal grease or in that at least one heat sink in a flat contact surface area with the band-like amorphous core material by means of a preferably good thermally conductive adhesive is connected. In both cases, the heat transfer from the respective transformer core to the heat sink is improved in an advantageous manner.
Auch die Integration wenigstens eines vertikal den Transformatorkern durchlaufenden Kühlkanals, welcher vorzugsweise in einem schenkelähnlichen Bereich zwischen benachbarten Transformatorkernscheiben integriert ist, sorgt durch den Durchfluss eines Kühlmediums, beispielsweise Luft, in Kombination mit den Wärmeableitblechen für eine besonders vorteilhafte Wärmeabfuhr.The integration of at least one vertical cooling channel passing vertically through the transformer core, which is preferably integrated in a thigh-like region between adjacent transformer core disks, provides through the flow of a cooling medium, for example air, in combination with the heat dissipation plates for a particularly advantageous heat dissipation.
Die zuvor genannten Vorteile der verbesserten Wärmeabfuhr aus dem Inneren des amorphen Transformatorkerns erschließen sich auch und insbesondere für einen Transformator, umfassend einen Transformatorkern nach einem der Ansprüche 1 bis 14, wenigstens eine hohlzylindrisch ausgeformte elektrische Wicklung mit einer Unter- und einer Oberspannungsseite, wobei wenigstens ein schenkelähnlich ausgeprägter Bereich des amorphen Transformatorkerns die wenigstens eine Wicklung im hohlzylindrischen Innenraum durchgreift und diese zumindest teilweise in dem wenigstens einen Wickelfenster angeordnet ist. Durch den elektrischen Betrieb der Wicklungen, beispielsweise mit einer primären Nennspannung von 20kV, einer sekundären Nennspannung von 400V bei einer Netzfrequenz von 50Hz, erfolgt im amorphen Transformatorkern aufgrund von Hystereseverlusten ein Wärmeeintrag, welcher allerdings geringer ist bei einem vergleichbaren konventionellen Transformatorkern. Diese Wärme kann dann in besonders effektiver Weise mit den erfindungsgemäßen Wärmeableitblechen aus dem Inneren des Transformatorkerns geleitet werden, so dass sich eine niedrigere und homogenere Kerntemperatur einstellt, welche letztendlich zu verbesserten magnetischen Betriebseigenschaften des amorphen Kernmaterials führt.The above-mentioned advantages of the improved heat dissipation from inside the amorphous transformer core are also revealed, and in particular for a transformer comprising a transformer core according to one of claims 1 to 14, at least one hollow cylindrical electric winding with a low and a high voltage side, wherein at least one leg-like pronounced region of the amorphous transformer core which engages through at least one winding in the hollow cylindrical interior and this is at least partially disposed in the at least one winding window. Due to the electrical operation of the windings, for example with a primary rated voltage of 20kV, a secondary rated voltage of 400V at a line frequency of 50Hz, takes place in the amorphous transformer core due to hysteresis losses, a heat input, which, however, is lower in a comparable conventional transformer core. This heat can then be conducted in a particularly effective manner with the heat sinks according to the invention from the interior of the transformer core, so that sets a lower and more homogeneous core temperature, which ultimately leads to improved magnetic operating properties of the amorphous core material.
Weitere vorteilhafte Ausgestaltungsmöglichkeiten sind den weiteren abhängigen Ansprüchen zu entnehmen.Further advantageous embodiment possibilities can be found in the further dependent claims.
Anhand der in den Zeichnungen dargestellten Ausführungsbeispiele sollen die Erfindung, weitere Ausführungsformen und weitere Vorteile näher beschrieben werden.Reference to the embodiments illustrated in the drawings, the invention, further embodiments and other advantages will be described in detail.
Es zeigen:
- Fig. 1
- eine exemplarische erste Transformatorkernscheibe in einer dreidimensionalen Ansicht,
- Fig. 2
- einen Schnitt durch einen ersten exemplarischen amorphen Transformatorkern,
- Fig. 3
- eine Seitenansicht auf einen zweiten exemplarischen Transformatorkern,
- Fig. 4
- eine Draufsicht auf einen dritten exemplarischen Transformatorkern mit Wicklungen sowie
- Fig. 5
- eine exemplarische zweite Kernscheibe.
- Fig. 1
- an exemplary first transformer core in a three-dimensional view,
- Fig. 2
- a section through a first exemplary amorphous transformer core,
- Fig. 3
- a side view of a second exemplary transformer core,
- Fig. 4
- a plan view of a third exemplary transformer core with windings as well
- Fig. 5
- an exemplary second core disk.
- 1010
- exemplarische erste Transformatorkernscheibeexemplary first transformer core disk
- 1212
- erste Lagen aus bandartigem amorphen Kernmaterialfirst layers of band-like amorphous core material
- 1414
- erstes Wickelfensterfirst winding window
- 1616
- zweites Wickelfenstersecond winding window
- 1818
- Breite der ersten TransformatorkernscheibeWidth of the first transformer core
- 2020
- Schnitt durch ersten exemplarischen amorphen TransformatorkernSection through the first exemplary amorphous transformer core
- 2222
- zweite Lagen aus bandartigem amorphen Kernmaterialsecond layers of ribbon-like amorphous core material
- 2424
- benachbarte Lagen aus bandartigem amorphen Kernmaterialadjacent layers of band-like amorphous core material
- 2626
- erste Wärmeableitblechefirst heat sinks
- 2828
- erster Wärmetauschbereichfirst heat exchange area
- 3030
- Kühlrippenähnliche Enden von ersten WärmeableitblechenCooling fin-like ends of first heat sinks
- 3232
- erste Transformatorkernscheibe von erstem Transformatorkernfirst transformer core of first transformer core
- 3434
- zweite Transformatorkernscheibe von erstem Transformatorkernsecond transformer core of first transformer core
- 3636
- erste Seitenplatte von erstem Transformatorkernfirst side plate of first transformer core
- 3838
- zweite Seitenplatte von erstem Transformatorkernsecond side plate of first transformer core
- 4040
- Seitenansicht auf zweiten exemplarischen TransformatorkernSide view on second exemplary transformer core
- 4242
- erste Transformatorkernscheibe von zweitem Transformatorkernfirst transformer core of second transformer core
- 4444
- zweite Transformatorkernscheibe von zweitem Transformatorkernsecond transformer core of second transformer core
- 4646
- zweite Wärmeableitblechesecond heat sinks
- 4848
- zweiter Wärmetauschbereichsecond heat exchange area
- 5050
- dritter Wärmetauschbereichthird heat exchange area
- 6060
- Draufsicht auf dritten exemplarischen Transformatorkern mit WicklungenTop view of third exemplary transformer core with windings
- 6262
- erste Transformatorkernscheibe von drittem Transformatorkernfirst transformer core of third transformer core
- 6464
- zweite Transformatorkernscheibe von drittem Transformatorkernsecond transformer core of third transformer core
- 6666
- abgewinkelte Enden von dritten WärmeableitblechenAngled ends of third Wärmeableitblechen
- 6868
- drittes Wärmeableitblechthird heat sink
- 7070
- Kühlkanälecooling channels
- 7272
- Wicklungenwindings
- 7474
- vierter Wärmetauschbereichfourth heat exchange area
- 8080
- exemplarische zweite Kernscheibeexemplary second core disk
- 8282
- drittes Wicklungsfensterthird winding window
- 8484
- viertes Wicklungsfensterfourth winding window
- 8686
- fünftes Wicklungsfensterfifth winding window
- 8888
- sechstes Wicklungsfenstersixth winding window
- 9090
- dritte Lagen aus bandartigem amorphen Kernmaterialthird layers of band-like amorphous core material
- 9292
- schenkelähnlich ausgeprägter Bereichthigh-like pronounced area
Claims (15)
dass wenigstens ein Wärmeableitblech (26, 30, 46, 66, 68) in das Innere des amorphen Transformatorkerns (20, 40, 60) hineinreicht und dass dieses von dort in wenigstens einen Wärmetauschbereich (28, 48, 50, 74) außerhalb des amorphen Transformatorkerns (20, 40, 60) geführt ist, so dass eine verbesserte Ableitung von innerhalb des amorphen Transformatorkerns (20, 40, 60) anfallender Wärmeenergie ermöglicht ist.An amorphous transformer core (20, 40, 60) comprising at least one transformer core disk (10, 32, 34, 42, 44, 62, 64, 80) having a plurality of concentric around at least one winding window (14, 16, 82, 84, 86 , 88) arranged layers of a ribbon-like amorphous core material (12, 22, 24, 90), characterized
that at least one heat sink (26, 30, 46, 66, 68) into the interior of the amorphous transformer core (20, 40, 60) extends, and that this amorphous from there into at least one heat exchange region (28, 48, 50, 74) outside the Transformer core (20, 40, 60) is guided, so that an improved dissipation of heat generated within the amorphous transformer core (20, 40, 60) is possible.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP10193977.5A EP2463871B1 (en) | 2010-12-07 | 2010-12-07 | Amorphous transformer core |
US13/311,104 US9041501B2 (en) | 2010-12-07 | 2011-12-05 | Amorphous transformer core |
CN2011104210861A CN102543372A (en) | 2010-12-07 | 2011-12-06 | Amorphous transformer core |
BRPI1105631-2A BRPI1105631A2 (en) | 2010-12-07 | 2011-12-06 | amorphous transformer core |
Applications Claiming Priority (1)
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EP10193977.5A EP2463871B1 (en) | 2010-12-07 | 2010-12-07 | Amorphous transformer core |
Publications (2)
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EP2463871A1 true EP2463871A1 (en) | 2012-06-13 |
EP2463871B1 EP2463871B1 (en) | 2017-06-14 |
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EP10193977.5A Not-in-force EP2463871B1 (en) | 2010-12-07 | 2010-12-07 | Amorphous transformer core |
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US (1) | US9041501B2 (en) |
EP (1) | EP2463871B1 (en) |
CN (1) | CN102543372A (en) |
BR (1) | BRPI1105631A2 (en) |
Cited By (4)
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DE102013105120A1 (en) * | 2013-05-17 | 2014-11-20 | Reo Inductive Components Ag | Electrical and inductive components |
EP2916333A1 (en) * | 2014-03-03 | 2015-09-09 | ABB Technology AG | Amorphous transformer core |
EP2977996A1 (en) * | 2014-07-21 | 2016-01-27 | Siemens Aktiengesellschaft | Choke coil of a power converter |
FR3045923A1 (en) * | 2015-12-17 | 2017-06-23 | Commissariat Energie Atomique | MONOLITHIC INDUCTANCE CORES INTEGRATING THERMAL DRAIN |
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US9853694B2 (en) * | 2012-03-30 | 2017-12-26 | Analogic Corporation | Contactless communication signal transfer |
CN103714938A (en) * | 2012-10-02 | 2014-04-09 | 捷通国际有限公司 | Magnetic flux guide component |
US20140262499A1 (en) * | 2013-03-14 | 2014-09-18 | Boulder Wind Power, Inc. | Methods and apparatus for optimizing electrically inoperative zones on laminated composite assemblies |
US9793775B2 (en) | 2013-12-31 | 2017-10-17 | Boulder Wind Power, Inc. | Methods and apparatus for reducing machine winding circulating current losses |
JP6871731B2 (en) * | 2016-12-14 | 2021-05-12 | 東芝産業機器システム株式会社 | Transformer |
JP6517882B2 (en) * | 2017-07-04 | 2019-05-22 | ファナック株式会社 | Core body and reactor |
EP3608925A1 (en) | 2018-08-08 | 2020-02-12 | Rohde & Schwarz GmbH & Co. KG | Magnetic core, method for manufacturing a magnetic core and balun with a magnetic core |
CN109494049A (en) * | 2018-12-15 | 2019-03-19 | 泰州市天力铁芯制造有限公司 | A kind of transformer core frame of high efficiency and heat radiation |
CN114334385B (en) * | 2022-01-06 | 2024-07-02 | 清华大学 | Megawatt medium-frequency shell type isolation transformer based on amorphous magnetic core |
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DE102013105120B4 (en) * | 2013-05-17 | 2019-09-26 | Reo Inductive Components Ag | Electrical and inductive components |
EP2916333A1 (en) * | 2014-03-03 | 2015-09-09 | ABB Technology AG | Amorphous transformer core |
EP2977996A1 (en) * | 2014-07-21 | 2016-01-27 | Siemens Aktiengesellschaft | Choke coil of a power converter |
FR3045923A1 (en) * | 2015-12-17 | 2017-06-23 | Commissariat Energie Atomique | MONOLITHIC INDUCTANCE CORES INTEGRATING THERMAL DRAIN |
Also Published As
Publication number | Publication date |
---|---|
US9041501B2 (en) | 2015-05-26 |
US20120139682A1 (en) | 2012-06-07 |
EP2463871B1 (en) | 2017-06-14 |
CN102543372A (en) | 2012-07-04 |
BRPI1105631A2 (en) | 2013-04-16 |
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