WO2014169997A1 - Dry-type transformer coil and dry-type transformer - Google Patents
Dry-type transformer coil and dry-type transformer Download PDFInfo
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- WO2014169997A1 WO2014169997A1 PCT/EP2014/000949 EP2014000949W WO2014169997A1 WO 2014169997 A1 WO2014169997 A1 WO 2014169997A1 EP 2014000949 W EP2014000949 W EP 2014000949W WO 2014169997 A1 WO2014169997 A1 WO 2014169997A1
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- dry
- cooling channel
- type 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/322—Insulating of coils, windings, or parts thereof the insulation forming channels for circulation of the fluid
Definitions
- the invention relates to a dry-type transformer coil, comprising at least two hollow cylindrical, nested and radially spaced windings, wherein in the hollow cylindrical space formed by the spacing by means of corresponding wall elements axially extending cooling channels are formed, which are arranged in at least three radially adjacent cooling channel levels depicteinan-.
- the invention also relates to a dry-type transformer having a dry-type transformer coil according to the invention.
- dry-type transformers are used in power distribution networks to adapt to respective voltage levels, for example between 6kV / 10kV / 30kV or 60kV levels. Power ratings of some 100kVA to over 10MVA are common. While the use of oil as cooling and insulating agent is indispensable for high-voltage transformers, for example at the 380kV voltage level, in dry-type transformers a liquid cooling or insulating agent is deliberately avoided due to the lower insulation requirements in the corresponding lower voltage levels. This offers the advantage of a simplified structure. The insulation or cooling then typically takes place via ambient air.
- a dry transformer coil which has an improved cooling behavior or uses an existing flow volume of coolant as effectively as possible. It is also an object of the invention to provide a dry-type transformer with improved cooling behavior.
- the object is achieved by a dry-type transformer coil of the type mentioned at the outset. This is characterized in that a constriction element for narrowing the cooling channel cross-section is arranged in at least one of the cooling channels located in a cooling channel plane lying neither radially inward nor radially.
- the basic idea of the invention is to allow cooling air to flow through such cooling channels in an amplified manner, which adjoin one of the windings emitting waste heat.
- a stray channel which is usually also used for the arrangement of cooling channels.
- both radial supports made of insulating strips and transversely extending hollow cylindrical support levels of a flat insulation material are usually installed to a honeycomb-like hollow cylindrical support structure, through which elongated cavities, the cooling channels are formed.
- a plurality of hollow cylindrical support levels are provided so that correspondingly three or more cooling channel planes are formed.
- cooling channels which adjoin a winding which gives off heat loss, flow through in the same way as cooling channels which are more remote from it.
- the radially inner and outer cooling channel plane directly adjoin the loss heat dissipating upper or lower voltage winding, the cooling channel planes located therebetween are thermally removed from the heat sources, although not thermally insulated due to, for example, corresponding indirect heat radiation.
- cooling channels by means of a constricting element in its cross section, which are less flowed through according to the principle of least flow resistance, these cooling channels and the radially inside or outside cooling channels are flowed through.
- a flow through the cooling channels is ensured in an advantageous manner, which corresponds to the respective heat input into this.
- the available flowing coolant is thereby used in an improved manner for heat removal from the dry-transformer coil.
- the principle according to the invention is, of course, also transferable to winding segments, for example when a winding is divided into two respective hollow-cylindrical and galvanically interconnected winding segments, which are interleaved and spaced from one another. In this case, cooling channels are then also provided between the winding segments, in which, if necessary, an inventive constriction element can be arranged.
- a constriction element is designed and arranged such that the creepage distance in the radial direction is at least not shortened.
- the supporting structure between the nested windings, which includes the cooling channels, must also meet the requirements for electrical insulation.
- the creepage path has a significant influence. Assuming that a support structure containing cooling channels meets the insulation requirements, thus, this also applies to a support structure with inserted constriction elements.
- a suitable embodiment of a non-creepage elongating constricting element is, for example, shaped like a rib, wave or meander.
- a constriction element is to be arranged in a cooling channel such that the elongated extension of the rib, wave or meandering form extends radially, thus the creeping path along the constricting element is thus extended in an advantageous manner.
- a corkscrew-like, spiral-like expression of a constriction element is also conceivable.
- a constricting element as well as the support structure comprising the cooling channels is made of an insulating material.
- Constriction elements are arranged in a preferred embodiment of the dry-type transformer coil according to the invention at least one of the two axial ends of the at least one cooling channel, but in a particularly preferred form at both axial ends.
- constriction elements are provided in the respective cooling channels over the entire circumference of at least one cooling channel plane.
- the improved cooling effect achieved with a corresponding constricting element is achieved over the entire circumference of the dry-type transformer coil.
- the variant should also be mentioned that instead of reducing each cooling channel by 50% in its cross-section, it is also possible to completely close off every second one.
- At least one constriction element is produced from a plurality of modules with different coefficients of thermal expansion.
- a temperature-dependent narrowing of the cross section of a cooling channel can be achieved in an advantageous manner.
- the at least one constriction element is designed and arranged such that the flow resistance is reduced by the respective cooling channel with increasing temperature.
- a locally elevated temperature automatically results in a locally improved cooling effect.
- a corresponding embodiment comprises, for example, a tongue-like constriction element, which protrudes into the cooling channel and similar to the behavior of a bimetallic strip has a temperature-dependent bending behavior. At an elevated temperature, the bend is reduced and an increased cross-section of the cooling channel is released.
- a variant of a dry-type transformer coil according to the invention is therefore characterized in that a constriction element is also arranged in at least one cooling channel located radially inward or radially outward of the cooling channel plane which narrows the cross-sectional area of the respective cooling channel facing away from the respective outer surface of the hollow cylindrical interspace.
- the object according to the invention is also achieved by a dry-type transformer comprising a transformer core and at least one dry-type transformer coil according to the invention.
- a dry-type transformer comprising a transformer core and at least one dry-type transformer coil according to the invention.
- FIG. 2 shows a partial sectional view through a dry-type transformer with a dry-type transformer coil as well
- Fig. 3 is a partial sectional view through a dry-type transformer coil.
- FIG. 1 shows an exemplary dry-type transformer coil 10 in a plan view.
- a fictitious winding axis 38 are arranged radially symmetrically two nested and radially spaced hollow cylindrical windings 12 and 14.
- a hollow cylindrical space 16 is formed, in which by means of radially extending support or wall elements 22 and transverse thereto arranged wall elements 18, 20, a support structure is formed.
- This support structure includes three radially adjacent cooling channel planes 24, 26, 28, in each of which a plurality of cooling channels 30, 32, 34 is formed.
- the radially inner cooling channel plane 24 adjoins the outer surface of the second, radially inner winding 14 and the radially outer cooling channel plane 28 is adjacent to the inner surface of the first, radially outer winding 12.
- the cooling channels 32 located in the middle cooling channel plane 26 are thermally removed and become heated only by indirect heat radiation from the adjacent wall elements 18, 20.
- narrowing elements 36 are provided in all cooling channels 32 of this plane which reduce the respective cooling channel cross section, for example, to 30% of the original cross section.
- FIG. 2 shows a partial sectional view through a dry transformer with dry transformer coil.
- a transformer core 62 around a fictitious winding axis 64 around two nested and each radially spaced hollow cylindrical windings 42, 44 are arranged. Due to the design of the dry-type transformer coil is divided axially, so that axially centrally an air inlet into the cooling channels is possible, as indicated by a lateral arrow.
- the windings 42, 44 are radially spaced from each other, wherein in the space formed thereby a plurality of radially adjacent cooling channels 46, 48, 50 are arranged.
- a constriction member 52 and 54 are arranged at its two axial ends, which reduce the cross section of the cooling channel 48 and its two halves at its ends, for example, to 40% of its original cross section.
- the middle cooling channel 48 flows through in comparison to the adjacent cooling channels 46 and 50 of a smaller air flow, as indicated by the arrows 56, 58 and 60.
- the utilization of an existing air flow is thereby increased in an advantageous manner.
- FIG. 3 shows a partial sectional view 70 through a dry-type transformer coil in the region of its upper axial end.
- three cooling channels 88, 90, 92 formed by wall elements are arranged between two nested hollow cylindrical windings 72, 74 .
- a constriction element 76 is arranged, which reduces the cross-section of this cooling channel insignificant.
- Such a slight narrowing of a cross-section of a cooling channel, which adjoins a winding dissipating heat loss may be useful, for example, although within the winding 72 cooling channels are provided even between individual turns and the existing coolant flow is to be directed increasingly through these cooling channels. This applies in particular under the assumption of a homogeneous flow on the lower end face of the dry-transformer coil.
- a constriction member 78 is arranged, which reduces its cross section to about 50% and thus ensures adapted to the respective heat input flow with cooling air, such as with an arrow indicated by the reference numeral 96, which is compared with the air streams 94, 98 reduced by the adjacent cooling channels 88, 92.
- the constriction element 80 which is arranged in the radially outer cooling channel 92, has a temperature-dependent bending behavior, similar to a bimetallic strip, wherein the constriction element 80 is of course made of electrically insulating materials, preferably of those with different coefficients of thermal expansion.
- the constriction element 80 is more or less heated by a heat radiation 86 emitted by the winding 74, depending on the operating state, resulting in a temperature-dependent bending, as indicated by the arrow with the reference number 84.
- a heat radiation 86 results in a cooling channel cross section narrowing bend 82nd
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Abstract
The invention relates to a dry-type transformer coil (10), comprising at least two hollow-cylindrical windings (12, 14, 42, 44, 72, 74) which are nested one inside the other and are spaced radially apart, wherein axially (38, 64) extending cooling channels (30, 32, 34, 46, 48, 50, 88, 90, 92) which are arranged next to one another in at least three radially adjacent cooling channel planes (24, 26, 28) are formed by means of corresponding wall elements (18, 20, 22) in the hollow-cylindrical interspace (16) formed by the spacing. A narrowing element (36, 52, 54, 76, 78, 80) for narrowing the cooling channel cross section is arranged in at least one of the cooling channels located in a cooling channel plane that is neither radially on the inside (24) nor radially on the outside (28). The invention also relates to a dry-type transformer comprising a dry-type transformer coil according to the invention.
Description
Trockentransformatorspule und Trockentransformator Dry transformer coil and dry-type transformer
Beschreibung Die Erfindung betrifft eine Trockentransformatorspule, umfassend wenigstens zwei hohlzylindrische, ineinander verschachtelte und radial beabstandete Wicklungen, wobei in dem durch die Beabstandung gebildeten hohlzylindrischen Zwischenraum mittels entsprechender Wandungselemente axial verlaufende Kühlkanäle gebildet sind, welche in wenigstens drei radial benachbarten Kühlkanalebenen nebeneinan- der angeordnet sind. Die Erfindung betrifft auch einen Trockentransformator mit einer erfindungsgemäßen Trockentransformatorspule. The invention relates to a dry-type transformer coil, comprising at least two hollow cylindrical, nested and radially spaced windings, wherein in the hollow cylindrical space formed by the spacing by means of corresponding wall elements axially extending cooling channels are formed, which are arranged in at least three radially adjacent cooling channel levels nebeneinan-. The invention also relates to a dry-type transformer having a dry-type transformer coil according to the invention.
Es ist allgemein bekannt, dass Trockentransformatoren in Energieverteilungsnetzen zur Anpassung an jeweilige Spannungsebenen verwendet werden, beispielsweise zwischen 6kV / 10kV / 30kV oder 60kV Ebenen. Hierbei sind Nennleistungen von einigen 100kVA bis über 10MVA üblich. Während bei Höchstspannungstransformato- ren beispielsweise in der Spannungsebene 380kV die Verwendung von Öl als Kühl- und Isolationsmittel unumgänglich ist wird bei Trockentransformatoren aufgrund der geringeren Isolationsanforderungen in den entsprechen darunter liegenden Span- nungsebenen bewusst auf eine ein flüssiges Kühl- beziehungsweise Isolationsmittel verzichtet. Dies bietet den Vorteil eines vereinfachten Aufbaus. Die Isolation beziehungsweise Kühlung erfolgt dann typischerweise über Umgebungsluft. It is well known that dry-type transformers are used in power distribution networks to adapt to respective voltage levels, for example between 6kV / 10kV / 30kV or 60kV levels. Power ratings of some 100kVA to over 10MVA are common. While the use of oil as cooling and insulating agent is indispensable for high-voltage transformers, for example at the 380kV voltage level, in dry-type transformers a liquid cooling or insulating agent is deliberately avoided due to the lower insulation requirements in the corresponding lower voltage levels. This offers the advantage of a simplified structure. The insulation or cooling then typically takes place via ambient air.
Aufgrund der im Vergleich zu Öl geringeren Wärmekapazität erweist sich die Küh- lung eines Trockentransformators beziehungsweise der jeweiligen Trockentransformatorspulen mit Luft als schwierig und aufwändig. Es ist neben einer Vielzahl von die Trockentransformatorspule axial durchquerenden Kühlkanälen je nach Leistungsklasse üblicherweise auch eine forcierte Kühlung vorzusehen. Je nach Leistungsklasse erfordert eine forcierte Kühlung einen erheblichen Aufwand aufgrund der Not- wendigkeit einer entsprechenden Förderung des Kühlmittels Luft durch die Kühlkanäle. Es gibt aber auch durchaus Trockentransformatorvarianten mit natürlicher Küh-Due to the lower heat capacity compared to oil, the cooling of a dry-type transformer or of the respective dry-type transformer coils with air proves to be difficult and expensive. Depending on the power class, it is customary to provide forced cooling in addition to a large number of cooling passages that axially traverse the dry-transformer coil. Depending on the performance class, forced cooling requires considerable effort due to the necessity of a corresponding delivery of the coolant air through the cooling channels. But there are also dry-transformer variants with natural cooling
BESTÄTIGUNGSKOPIE
lung. Durch forcierte Kühlung kann eine Leistungssteigerung gegenüber natürlicher Kühlung erreicht werden. CONFIRMATION COPY development. Forced cooling can increase performance over natural cooling.
Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, eine Tro- ckentransformatorspule anzugeben, welche ein verbessertes Kühlverhalten aufweist beziehungsweise ein vorhandenes Strömungsvolumen an Kühlmittel möglichst effektiv nutzt. Es ist ebenfalls Aufgabe der Erfindung, einen Trockentransformator mit verbessertem Kühlverhalten anzugeben. Die Aufgabe wird gelöst durch eine Trockentransformatorspule der eingangs genannten Art. Diese ist dadurch gekennzeichnet, dass in wenigstens einem der in einer weder radial innen noch radial außen liegenden Kühlkanalebene befindlichen Kühlkanäle ein Verengungselement zur Verengung des Kühlkanalquerschnitts angeordnet ist. Based on this prior art, it is an object of the invention to provide a dry transformer coil, which has an improved cooling behavior or uses an existing flow volume of coolant as effectively as possible. It is also an object of the invention to provide a dry-type transformer with improved cooling behavior. The object is achieved by a dry-type transformer coil of the type mentioned at the outset. This is characterized in that a constriction element for narrowing the cooling channel cross-section is arranged in at least one of the cooling channels located in a cooling channel plane lying neither radially inward nor radially.
Die Grundidee der Erfindung besteht darin, Kühlluft verstärkt durch solche Kühlkanäle strömen zu lassen, welche an eine der Verlustwärme abgebenden Wicklungen angrenzen. Zwischen Ober- und Unterspannungswicklung einer Transformatorspule ist konstruktiv ein Streukanal vorzusehen, der üblicherweise zudem zur Anordnung von Kühlkanälen genutzt wird. Zur Gewährleistung der erforderlichen mechanischen Stabilität zwischen ineinander verschachtelter Ober- und Unterspannungswicklung werden üblicherweise sowohl radiale AbStützungen aus isolierenden Leisten als auch quer dazu verlaufende hohlzylindrische Stützebenen aus einem flächigen Isolationsmaterial zu einer wabenähnlichen hohlzylindrischen Stützstruktur verbaut, durch de- ren längliche Hohlräume die Kühlkanäle gebildet sind. Je nach geometrischen Anforderungen sind auch mehrere hohlzylindrische Stützebenen vorgesehen, so dass entsprechend drei oder mehr Kühlkanalebenen gebildet sind. The basic idea of the invention is to allow cooling air to flow through such cooling channels in an amplified manner, which adjoin one of the windings emitting waste heat. Between the upper and lower voltage winding of a transformer coil is structurally provided a stray channel, which is usually also used for the arrangement of cooling channels. In order to ensure the required mechanical stability between nested upper and lower voltage windings, both radial supports made of insulating strips and transversely extending hollow cylindrical support levels of a flat insulation material are usually installed to a honeycomb-like hollow cylindrical support structure, through which elongated cavities, the cooling channels are formed. Depending on the geometric requirements, a plurality of hollow cylindrical support levels are provided so that correspondingly three or more cooling channel planes are formed.
Einen über alle Kühlkanäle vergleichbaren Kühlkanalquerschnitt vorausgesetzt, ist mit einer ebenfalls vergleichbaren Durchströmung der Kühlkanäle mit Kühlmittel, typischerweise Luft, zu rechnen. Es werden also die Kühlkanäle, welche an eine Verlustwärme abgebende Wicklung angrenzen, genauso durchströmt wie thermisch davon entferntere Kühlkanäle.
Während die radial innere und äußere Kühlkanalebene direkt an die Verlustwärme abgebende Ober- beziehungsweise Unterspannungswicklung angrenzen, sind die dazwischen befindlichen Kühlkanalebenen thermisch von den Wärmequellen entfernt, wenn auch aufgrund beispielsweise entsprechender indirekter Wärmestrahlung nicht thermisch isoliert. In jedem Fall ist davon auszugehen, dass - eine gleiche Durchströmung der Kühlkanäle mit Kühlmittel vorausgesetzt - mittels der in der radial inneren beziehungsweise äußeren Kühlkanalebene befindlichen Kühlkanäle eine höhere Wärmeabfuhr aus der Trockentransformatorspule erfolgt als mittels der dazwischen befindlichen Kühlkanäle. Assuming a cooling channel cross-section comparable to all cooling channels, a similarly comparable through-flow of the cooling channels with coolant, typically air, can be expected. Thus, the cooling channels, which adjoin a winding which gives off heat loss, flow through in the same way as cooling channels which are more remote from it. While the radially inner and outer cooling channel plane directly adjoin the loss heat dissipating upper or lower voltage winding, the cooling channel planes located therebetween are thermally removed from the heat sources, although not thermally insulated due to, for example, corresponding indirect heat radiation. In any case, it can be assumed that - provided an equal flow through the cooling channels with coolant - by means of located in the radially inner and outer cooling channel plane cooling channels a higher heat dissipation from the dry-transformer coil than by means of the cooling channels located therebetween.
Deshalb ist es erfindungsgemäß vorgesehen, die thermisch entfernteren Kühlkanäle mittels eines Verengungselementes in ihrem Querschnitt zu reduzieren, wodurch entsprechend dem Prinzip des geringsten Strömungswiderstandes diese Kühlkanäle weniger durchströmt werden und die radial innen beziehungsweise außen liegenden Kühlkanäle verstärkt durchströmt werden. Somit ist in vorteilhafter Weise eine Durchströmung der Kühlkanäle gewährleistet, welche dem jeweiligen Wärmeeintrag in diese entspricht. Das verfügbare strömende Kühlmittel wird dadurch in verbesserter Weise zur Wärmeabfuhr aus der Trockentransformatorspule genutzt. Das erfindungsgemäße Prinzip ist selbstverständlich auch auf Wicklungssegmente übertragbar, beispielsweise wenn eine Wicklung in zwei jeweils hohlzylindrische und galvanisch miteinander verbundene Wicklungssegmente geteilt ist, welche ineinander verschachtelt und gegeneinander beabstandet sind. In diesem Fall sind dann zwischen den Wicklungssegmenten ebenfalls Kühlkanäle vorgesehen, in welchen bedarfsweise ein erfindungsgemäßes Verengungselement angeordnet werden kann. Therefore, it is provided according to the invention to reduce the thermally remote cooling channels by means of a constricting element in its cross section, which are less flowed through according to the principle of least flow resistance, these cooling channels and the radially inside or outside cooling channels are flowed through. Thus, a flow through the cooling channels is ensured in an advantageous manner, which corresponds to the respective heat input into this. The available flowing coolant is thereby used in an improved manner for heat removal from the dry-transformer coil. The principle according to the invention is, of course, also transferable to winding segments, for example when a winding is divided into two respective hollow-cylindrical and galvanically interconnected winding segments, which are interleaved and spaced from one another. In this case, cooling channels are then also provided between the winding segments, in which, if necessary, an inventive constriction element can be arranged.
Entsprechend einer weiteren Ausgestaltungsform der erfindungsgemäßen Trockentransformatorspule ist ein Verengungselement derart ausgestaltet und angeordnet, dass der Kriechweg in radialer Richtung zumindest nicht verkürzt wird. Die die Kühl- kanäle beinhaltende Stützstruktur zwischen den ineinander verschachtelten Wicklungen muss zudem den Anforderungen an die elektrische Isolation Genüge leisten. Hierbei hat der Kriechweg einen erheblichen Einfluss. Ausgehend von der Annahme, dass eine Kühlkanäle beinhaltende Stützstruktur den Isolationsanforderungen ge-
nügt, gilt dies demgemäß auch für eine Stützstruktur mit eingesetzten Verengungselementen. According to a further embodiment of the dry-type transformer coil according to the invention, a constriction element is designed and arranged such that the creepage distance in the radial direction is at least not shortened. The supporting structure between the nested windings, which includes the cooling channels, must also meet the requirements for electrical insulation. Here, the creepage path has a significant influence. Assuming that a support structure containing cooling channels meets the insulation requirements, Thus, this also applies to a support structure with inserted constriction elements.
Eine geeignete Ausführungsform eines nicht Kriechweg verlängernden Verengungs- elementes ist beispielsweise rippen-, wellen- oder mäanderförmig ausgeprägt. Vorzugsweise ist ein solches Verengungselement derart in einem Kühlkanal anzuordnen, dass sich die längliche Erstreckung der Rippen-, Wellen- oder Mäanderform radial erstreckt, der Kriechweg längs des Verengungselementes dadurch also in vorteilhafter Weise verlängert ist. Es ist aber auch eine korkenzieherähnliche, spiralför- mige Ausprägung eines Verengungselementes denkbar. A suitable embodiment of a non-creepage elongating constricting element is, for example, shaped like a rib, wave or meander. Preferably, such a constriction element is to be arranged in a cooling channel such that the elongated extension of the rib, wave or meandering form extends radially, thus the creeping path along the constricting element is thus extended in an advantageous manner. However, a corkscrew-like, spiral-like expression of a constriction element is also conceivable.
In vorteilhafter Weise ist ein Verengungselement ebenso wie die die Kühlkanäle umfassende Stützstruktur aus einem Isolationsmaterial gefertigt. Verengungselemente sind in einer bevorzugten Ausgestaltungsform der erfindungsgemäßen Trockentransformatorspule an wenigstens einem der beiden axialen Enden des wenigstens einen Kühlkanals angeordnet, in besonders bevorzugter Form jedoch an beiden axialen Enden. Somit ist auch für den Fall, dass der Kühlkanal in seiner Mitte beispielsweise eine konstruktionsbedingte axiale Teilung aufweist, durch welche seitlich Kühlluft in diesen eintreten kann, sichergestellt dass der Querschnitt des Kühlkanals beiderseits entsprechend reduziert ist. Advantageously, a constricting element as well as the support structure comprising the cooling channels is made of an insulating material. Constriction elements are arranged in a preferred embodiment of the dry-type transformer coil according to the invention at least one of the two axial ends of the at least one cooling channel, but in a particularly preferred form at both axial ends. Thus, even in the event that the cooling channel in its center, for example, has a construction-related axial pitch, through which laterally cooling air can enter into this, ensures that the cross section of the cooling channel is reduced accordingly on both sides.
Entsprechend einer weiteren Ausgestaltungsform der erfindungsgemäßen Trockentransformatorspule sind über den gesamten Umfang wenigstens einer Kühlkanal- ebene Verengungselemente in den jeweiligen Kühlkanälen vorgesehen. Somit ist die mit einem entsprechenden Verengungselement erreichte verbesserte Kühlwirkung über den gesamten Umfang der Trockentransformatorspule erreicht. Hierbei ist es sowohl möglich, jeden Kühlkanal einer jeweiligen Kühlkanalebene zu verengen aber auch beispielsweise nur jeden zweiten. In diesem Zusammenhang sei auch die Vari- ante erwähnt, dass anstelle jeden Kühlkanal um 50% in seinem Querschnitt zu reduzieren auch die Möglichkeit besteht, jeden zweiten komplett zu verschließen. Auch weitere Varianten sind denkbar, beispielsweise bei fünf Kühlkanalebenen die dritte Ebene komplett zu verschließen und die angrenzende zweite und vierte Ebene zu je
Gemäß einer weiteren Ausführungsform der erfindungsgemäßen Trockentransformatorspule ist wenigstens ein Verengungselement aus mehreren Modulen mit unterschiedlichem Temperaturausdehnungskoeffizient gefertigt. Somit kann in vorteilhafter Weise eine temperaturabhängige Verengung des Querschnittes eines Kühlkanals erreicht werden. In einer besonders bevorzugten Variante ist daher das wenigstens eine Verengungselement derart ausgestaltet und angeordnet, dass bei steigender Temperatur der Strömungswiderstand durch den jeweiligen Kühlkanal reduziert wird. Somit hat eine lokal erhöhte Temperatur automatisch eine lokal verbesserte Kühlwir- kung zur Folge. Eine entsprechende Ausführungsform umfasst beispielsweise ein zungenähnliches Verengungselement, welches in den Kühlkanal hineinragt und ähnlich dem Verhalten eines Bimetalstreifens ein temperaturabhängiges Biegeverhalten aufweist. Bei einer erhöhten Temperatur wird die Biegung reduziert und ein erhöhter Querschnitt des Kühlkanals freigegeben. According to a further embodiment of the dry-type transformer coil according to the invention, constriction elements are provided in the respective cooling channels over the entire circumference of at least one cooling channel plane. Thus, the improved cooling effect achieved with a corresponding constricting element is achieved over the entire circumference of the dry-type transformer coil. In this case, it is both possible to narrow each cooling channel of a respective cooling channel plane but also, for example, only every second one. In this connection, the variant should also be mentioned that instead of reducing each cooling channel by 50% in its cross-section, it is also possible to completely close off every second one. Other variants are also conceivable, for example, completely close the third level at five cooling channel levels and the adjacent second and fourth level to each According to a further embodiment of the dry-type transformer coil according to the invention, at least one constriction element is produced from a plurality of modules with different coefficients of thermal expansion. Thus, a temperature-dependent narrowing of the cross section of a cooling channel can be achieved in an advantageous manner. In a particularly preferred variant, therefore, the at least one constriction element is designed and arranged such that the flow resistance is reduced by the respective cooling channel with increasing temperature. Thus, a locally elevated temperature automatically results in a locally improved cooling effect. A corresponding embodiment comprises, for example, a tongue-like constriction element, which protrudes into the cooling channel and similar to the behavior of a bimetallic strip has a temperature-dependent bending behavior. At an elevated temperature, the bend is reduced and an increased cross-section of the cooling channel is released.
Gerade die zuletzt genannte Ausführungsform ist erfindungsgemäß auch geeignet, in einem Kühlkanal der radial inneren oder äußeren Kühlkanalebene zum Einsatz zu kommen. Eine Variante einer erfindungsgemäßen Trockentransformatorspule ist daher dadurch gekennzeichnet, dass auch in wenigstens einem in einer radial innen oder radial außen liegenden Kühlkanalebene befindlichen Kühlkanal ein Verengungselement angeordnet ist, welches den der jeweiligen Außenfläche des hohlzylindrischen Zwischenraumes abgewandten Querschnittsbereich des jeweiligen Kühlkanals verengt. Durch eine Wärmestrahlung von der der jeweiligen Wicklung zugewandten Seite des Kühlkanals erfolgt ein Wärmeeintrag in das zungenähnliche Ver- engungselement, so dass eine temperaturabhängige Durchströmung auch in Kühlkanälen dieser Ebenen ermöglicht ist. Especially the latter embodiment is also suitable according to the invention to be used in a cooling channel of the radially inner or outer cooling channel plane. A variant of a dry-type transformer coil according to the invention is therefore characterized in that a constriction element is also arranged in at least one cooling channel located radially inward or radially outward of the cooling channel plane which narrows the cross-sectional area of the respective cooling channel facing away from the respective outer surface of the hollow cylindrical interspace. By heat radiation from the side of the cooling channel facing the respective winding, heat is introduced into the tongue-like constriction element, so that a temperature-dependent throughflow is also made possible in cooling channels of these planes.
Die erfindungsgemäße Aufgabe wird auch gelöst durch einen Trockentransformator, umfassend einen Transformatorkern und wenigstens eine erfindungsgemäße Tro- ckentransformatorspule. Die entsprechenden Vorteile insbesondere bezüglich einer verbesserten Ausnutzung eines Kühlmittelstromes wurden bereits zuvor erläutert. Gemäß einer erfindungsgemäßen Variante des Trockentransformators ist dieser forciert gekühlt, weist also beispielsweise ein Fördermittel für Kühlluft auf, beispielsweise ein Gebläse. Dieses kann nämlich bei Verwendung einer erfindungsgemäßen
Trockentransformatorspule aufgrund der effektiveren Ausnutzung des Kühlmittelstromes entsprechend geringer ausgelegt werden. The object according to the invention is also achieved by a dry-type transformer comprising a transformer core and at least one dry-type transformer coil according to the invention. The corresponding advantages, in particular with regard to improved utilization of a coolant flow, have already been explained above. According to a variant of the dry-type transformer according to the invention, the latter is forcedly cooled and therefore has, for example, a conveying means for cooling air, for example a blower. This can namely when using a novel Dry transformer coil can be designed correspondingly lower due to the more effective use of the coolant flow.
Weitere vorteilhafte Ausgestaltungsmöglichkeiten sind den weiteren abhängigen An- Sprüchen zu entnehmen. Further advantageous design options 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: Show it:
Fig. 1 eine exemplarische Trockentransformatorspule, 1 shows an exemplary dry-type transformer coil,
Fig. 2 eine Teilschnittansicht durch einen Trockentransformator mit Trockentrans- formatorspule sowie 2 shows a partial sectional view through a dry-type transformer with a dry-type transformer coil as well
Fig. 3 eine Teilschnittansicht durch eine Trockentransformatorspule. Fig. 3 is a partial sectional view through a dry-type transformer coil.
Figur 1 zeigt eine exemplarische Trockentransformatorspule 10 in einer Draufsicht. Um eine fiktive Wickelachse 38 herum sind radialsymmetrisch zwei ineinander ver- schachtelte und radial beabstandete hohlzylindrische Wicklungen 12 und 14 angeordnet. Durch die radiale Beabstandung ist ein hohlzylindrischer Zwischenraum 16 gebildet, in welchem mittels radial verlaufender Abstütz- beziehungsweise Wandungselemente 22 und quer dazu angeordneter Wandungselemente 18, 20 eine Stützstruktur gebildet ist. Diese Stützstruktur beinhaltet drei radial benachbarte Kühl- kanalebenen 24, 26, 28, in welchen jeweils eine Vielzahl von Kühlkanälen 30, 32, 34 gebildet ist. FIG. 1 shows an exemplary dry-type transformer coil 10 in a plan view. Around a fictitious winding axis 38 are arranged radially symmetrically two nested and radially spaced hollow cylindrical windings 12 and 14. By the radial spacing, a hollow cylindrical space 16 is formed, in which by means of radially extending support or wall elements 22 and transverse thereto arranged wall elements 18, 20, a support structure is formed. This support structure includes three radially adjacent cooling channel planes 24, 26, 28, in each of which a plurality of cooling channels 30, 32, 34 is formed.
Die radial innere Kühlkanalebene 24 grenzt an die Außenfläche der zweiten, radial innen befindlichen Wicklung 14 und die radial äußere Kühlkanalebene 28 grenzt an die Innenfläche der ersten, radial außen befindlichen Wicklung 12. Somit ist ein guter Wärmeeintrag von der jeweiligen Wicklung in die in der jeweiligen Kühlkanalebene befindlichen Kühlkanäle 30 beziehungsweise 34 gewährleistet. Die in der mittleren Kühlkanalebene 26 befindlichen Kühlkanäle 32 sind thermisch entfernt und werden
lediglich durch indirekte Wärmestrahlung von den angrenzenden Wandungselementen 18, 20 erwärmt. The radially inner cooling channel plane 24 adjoins the outer surface of the second, radially inner winding 14 and the radially outer cooling channel plane 28 is adjacent to the inner surface of the first, radially outer winding 12. Thus, a good heat input from the respective winding in the respective Coolant channel located cooling channels 30 and 34 guaranteed. The cooling channels 32 located in the middle cooling channel plane 26 are thermally removed and become heated only by indirect heat radiation from the adjacent wall elements 18, 20.
Um diesem geringeren Wärmeeintrag in die Kühlkanäle 32 der mittleren Kühlkanal- ebene 26 Rechnung zu tragen sind in allen Kühlkanälen 32 dieser Ebene Verengungselemente 36 vorgesehen, welche den jeweiligen Kühlkanalquerschnitt beispielsweise auf 30% des ursprünglichen Querschnittes verringern. In order to take account of this lower heat input into the cooling channels 32 of the middle cooling channel plane 26, narrowing elements 36 are provided in all cooling channels 32 of this plane which reduce the respective cooling channel cross section, for example, to 30% of the original cross section.
Figur 2 zeigt eine Teilschnittansicht durch einen Trockentransformator mit Trocken- transformatorspule. Um einen Schenkel eines Transformatorkerns 62 sind um eine fiktive Wickelachse 64 herum zwei ineinander verschachtelte und zueinander radial beabstandete hohlzylindrische Wicklungen 42, 44 angeordnet. Konstruktiv bedingt ist die Trockentransformatorspule axial geteilt, so dass axial mittig ein Lufteintritt in die Kühlkanäle möglich ist, wie mit einem seitlichen Pfeil angedeutet ist. Die Wicklungen 42, 44 sind radial zueinander beabstandet, wobei in dem dadurch gebildeten Zwischenraum mehrere radial benachbarte Kühlkanäle 46, 48, 50 angeordnet sind. Im mittleren Kühlkanal 48 sind an seinen beiden axialen Enden je ein Verengungselement 52 beziehungsweise 54 angeordnet, welche den Querschnitt des Kühlkanals 48 beziehungsweise seiner beiden Hälften an seinen Enden beispielsweise auf 40% seines ursprünglichen Querschnitts verringern. Hierdurch wird - eine homogene Beströmung der unteren Stirnseite der Trockentransformatorspule mit Kühlmittel vorausgesetzt - der mittlere Kühlkanal 48 im Vergleich zu den angrenzenden Kühlkanälen 46 und 50 von einem geringeren Luftstrom durchströmt, wie mit den Pfeilen 56, 58 und 60 angedeutet ist. Die Ausnutzung eines vorhandenen Luftstromes ist dadurch in vorteilhafter Weise erhöht. FIG. 2 shows a partial sectional view through a dry transformer with dry transformer coil. To one leg of a transformer core 62 around a fictitious winding axis 64 around two nested and each radially spaced hollow cylindrical windings 42, 44 are arranged. Due to the design of the dry-type transformer coil is divided axially, so that axially centrally an air inlet into the cooling channels is possible, as indicated by a lateral arrow. The windings 42, 44 are radially spaced from each other, wherein in the space formed thereby a plurality of radially adjacent cooling channels 46, 48, 50 are arranged. In the middle cooling channel 48, a constriction member 52 and 54 are arranged at its two axial ends, which reduce the cross section of the cooling channel 48 and its two halves at its ends, for example, to 40% of its original cross section. As a result, - provided a homogeneous flow of the lower end face of the dry-transformer coil with coolant - the middle cooling channel 48 flows through in comparison to the adjacent cooling channels 46 and 50 of a smaller air flow, as indicated by the arrows 56, 58 and 60. The utilization of an existing air flow is thereby increased in an advantageous manner.
Figur 3 zeigt eine Teilschnittansicht 70 durch eine Trockentransformatorspule im Bereich von deren oberen axialen Ende. Zwischen zwei ineinander verschachtelten hohlzylindrischen Wicklungen 72, 74 sind drei durch Wandungselemente gebildete Kühlkanäle 88, 90, 92 angeordnet. Im ersten als radial innen anzunehmenden Kühlkanal 88 ist ein Verengungselement 76 angeordnet, welches den Querschnitt dieses Kühlkanals unwesentlich reduziert. Eine derartige geringfügige Verengung eines Querschnitts eines Kühlkanals, welcher an eine Verlustwärme abgebende Wicklung angrenzt, kann beispielsweise dann sinnvoll sein, wenn auch innerhalb der Wicklung
72 selbst zwischen einzelnen Windungen Kühlkanäle vorgesehen sind und der vorhandene Kühlmittelstrom auch verstärkt durch diese Kühlkanäle geleitet werden soll. Dies gilt insbesondere unter der Annahme einer homogenen Beströmung der unteren Stirnseite der Trockentransformatorspule. FIG. 3 shows a partial sectional view 70 through a dry-type transformer coil in the region of its upper axial end. Between two nested hollow cylindrical windings 72, 74 three cooling channels 88, 90, 92 formed by wall elements are arranged. In the first as radially inward to be assumed cooling channel 88, a constriction element 76 is arranged, which reduces the cross-section of this cooling channel insignificant. Such a slight narrowing of a cross-section of a cooling channel, which adjoins a winding dissipating heat loss, may be useful, for example, although within the winding 72 cooling channels are provided even between individual turns and the existing coolant flow is to be directed increasingly through these cooling channels. This applies in particular under the assumption of a homogeneous flow on the lower end face of the dry-transformer coil.
Im mittleren Kühlkanal 90, welcher thermisch etwas weiter von den Verlustwärme abgebenden Wicklungen 72, 74 entfernt angeordnet ist, ist ein Verengungselement 78 angeordnet, welches dessen Querschnitt auf etwa 50% reduziert und somit für eine an den jeweiligen Wärmeeintrag angepasste Durchströmung mit Kühlluft sorgt, wie mit einem Pfeil mit der Bezugsziffer 96 angedeutet, welcher gegenüber den Luftströmen 94, 98 durch die benachbarten Kühlkanäle 88, 92 reduziert ist. In the middle cooling channel 90, which is thermally located somewhat further away from the heat dissipation windings 72, 74, a constriction member 78 is arranged, which reduces its cross section to about 50% and thus ensures adapted to the respective heat input flow with cooling air, such as with an arrow indicated by the reference numeral 96, which is compared with the air streams 94, 98 reduced by the adjacent cooling channels 88, 92.
Als besondere Ausführungsform eines Verengungselementes weist das Verengungselement 80, welches im radial äußeren Kühlkanal 92 angeordnet ist, ein tem- peraturabhängiges Biegeverhalten auf, ähnlich einem Bimetalstreifen, wobei das Verengungselement 80 selbstverständlich aus elektrisch isolierenden Materialien gefertigt ist, vorzugsweise aus solchen mit unterschiedlichen Temperaturausdehnungskoeffizienten. Das Verengungselement 80 wird durch eine von der Wicklung 74 abgegebene Wärmestrahlung 86 je nach Betriebszustand mehr oder weniger er- wärmt, wobei sich eine temperaturabhängige Biegung ergibt, wie mit dem Pfeil mit der Bezugsziffer 84 angedeutet. Bei einer niedrigeren Wärmestrahlung 86 ergibt sich eine den Kühlkanalquerschnitt verengende Biegung 82.
As a particular embodiment of a constricting element, the constriction element 80, which is arranged in the radially outer cooling channel 92, has a temperature-dependent bending behavior, similar to a bimetallic strip, wherein the constriction element 80 is of course made of electrically insulating materials, preferably of those with different coefficients of thermal expansion. The constriction element 80 is more or less heated by a heat radiation 86 emitted by the winding 74, depending on the operating state, resulting in a temperature-dependent bending, as indicated by the arrow with the reference number 84. At a lower heat radiation 86 results in a cooling channel cross section narrowing bend 82nd
Bezugszeichenliste LIST OF REFERENCE NUMBERS
10 exemplarische Trockentransformatorspule 10 exemplary dry-type transformer coil
12 erste Wicklung von Trockentransformatorspule 12 first winding of dry transformer coil
14 zweite Wicklung von Trockentransformatorspule 14 second winding of dry transformer coil
16 hohlzylindrischer Zwischenraum 16 hollow cylindrical space
18 erstes hohlzylindrisches Wandungselement 18 first hollow cylindrical wall element
20 zweites hohlzylindrisches Wandungselement 20 second hollow cylindrical wall element
22 radiales Wandungselement 22 radial wall element
24 radial innen liegende Kühlkanalebene 24 radially inner cooling channel plane
26 radial mittig liegende Kühlkanalebene 26 radially centrally located cooling channel plane
28 radial außen liegende Kühlkanalebene 28 radially outer cooling channel plane
30 in radial innen liegender Kühlkanalebene befindlicher Kühlkanal 30 located in radially inner cooling channel plane befindlicher cooling channel
32 in radial mittig liegender Kühlkanalebene befindlicher Kühlkanal 32 in radially central cooling channel plane befindlicher cooling channel
34 in radial außen liegender Kühlkanalebene befindlicher Kühlkanal 34 located in the radially outer cooling channel plane located cooling channel
36 exemplarisches Verengungselement 36 exemplary constricting element
38 Wickelachse 38 winding axis
40 Teilschnittansicht durch Trockentransformator mit Trockentransformatorspule 40 Partial sectional view through dry-type transformer with dry-type transformer coil
42 erste Wicklung von Trockentransformatorspule 42 first winding of dry transformer coil
44 zweite Wicklung von Trockentransformatorspule 44 Second winding of dry transformer coil
46 erster Kühlkanal 46 first cooling channel
48 zweiter Kühlkanal 48 second cooling channel
50 dritter Kühlkanal 50 third cooling channel
52 an erstem axialen Ende von Kühlkanal angeordnetes Verengungselement 54 an zweitem axialen Ende von Kühlkanal angeordnetes Verengungselement 52 arranged at the first axial end of the cooling channel constriction element 54 arranged at the second axial end of the cooling channel constriction element
56 Luftstrom durch ersten Kühlkanal 56 Airflow through the first cooling channel
58 Luftstrom durch zweiten Kühlkanal 58 air flow through second cooling channel
60 Luftstrom durch dritten Kühlkanal 60 Airflow through third cooling channel
62 Schenkel von Transformatorkern 62 legs of transformer core
64 Wickelachse 64 winding axis
70 Teilschnittansicht durch Trockentransformatorspule 70 Partial sectional view through dry transformer coil
72 erste Wicklung von Trockentransformatorspule 72 First winding of dry transformer coil
74 zweite Wicklung von Trockentransformatorspule 74 Second winding of dry transformer coil
76 erstes Verengungselement
zweites Verengungselement 76 first constriction element second constriction element
drittes Verengungselement third constriction element
verschiedene Biegezustände von drittem Verengungselement Biegerichtung von drittem Verengungselement different bending states of third constriction element bending direction of third constriction element
Wärmestrahlung von zweiter Wicklung Heat radiation from second winding
erster Kühlkanal first cooling channel
zweiter Kühlkanal second cooling channel
dritter Kühlkanal third cooling channel
Luftstrom durch ersten Kühlkanal Air flow through the first cooling channel
Luftstrom durch zweiten Kühlkanal Air flow through the second cooling channel
Luftstrom durch dritten Kühlkanal
Air flow through third cooling channel
Claims
1. Trockentransformatorspule (10), umfassend wenigstens zwei hohlzylindrische, ineinander verschachtelte und radial beabstandete Wicklungen (12, 14, 42, 44, 72, 74), wobei in dem durch die Beabstandung gebildeten hohlzylindrischen Zwischenraum (16) mittels entsprechender Wandungselemente (18, 20, 22) axial (38, 64) verlaufende Kühlkanäle (30, 32, 34, 46, 48, 50, 88, 90, 92) gebildet sind, welche in wenigstens drei radial benachbarten Kühlkanalebenen (24, 26, 28) nebeneinander angeordnet sind, wobei in wenigstens einem der in einer weder radial innen (24) noch radial außen (28) liegenden Kühlkanalebene befindlichen Kühlkanäle ein Verengungselement (36, 52, 54, 76, 78, 80) zur Verengung des Kühlkanalquerschnitts angeordnet ist, A dry-type transformer coil (10), comprising at least two hollow-cylindrical, nested and radially spaced windings (12, 14, 42, 44, 72, 74), wherein in the hollow cylindrical space (16) formed by the spacing by means of corresponding wall elements (18, 20, 22) axially (38, 64) extending cooling channels (30, 32, 34, 46, 48, 50, 88, 90, 92) are formed, which in at least three radially adjacent cooling channel planes (24, 26, 28) arranged side by side wherein a constriction element (36, 52, 54, 76, 78, 80) is arranged in at least one of the cooling channels located in a cooling channel plane that is neither radially inward (24) nor radially outward (28), for constriction of the cooling channel cross section,
dadurch gekennzeichnet, characterized,
dass das Verengungselement (36, 52, 54, 76, 78, 80) aus mehreren Modulen mit unterschiedlichem Temperaturausdehnungskoeffizient gefertigt ist. in that the constriction element (36, 52, 54, 76, 78, 80) is made of a plurality of modules with different coefficients of thermal expansion.
2. Trockentransformatorspule nach Anspruch 1 , dadurch gekennzeichnet, dass das Verengungselement (36, 52, 54, 76, 78, 80) derart ausgestaltet und angeordnet ist, dass der Kriechweg im Kühlkanal in radialer Richtung zumindest nicht verkürzt wird. 2. dry-type transformer coil according to claim 1, characterized in that the constriction element (36, 52, 54, 76, 78, 80) is configured and arranged such that the creepage distance in the cooling passage in the radial direction is at least not shortened.
3. Trockentransformatorspule nach Anspruch 1 , dadurch gekennzeichnet, dass das Verengungselement (36, 52, 54, 76, 78, 80) rippen- , wellen- oder mäanderförmig ausgeprägt ist. 3. dry transformer coil according to claim 1, characterized in that the constriction element (36, 52, 54, 76, 78, 80) is rib, wave or meandering pronounced.
4. Trockentransformatorspule nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Verengungselement (36, 52, 54, 76, 78, 80) aus einem elektrischen Isolationsmaterial gefertigt ist. 4. dry-type transformer coil according to one of the preceding claims, characterized in that the constriction element (36, 52, 54, 76, 78, 80) is made of an electrical insulation material.
5. Trockentransformatorspule nach einem der vorherigen Ansprüche, dadurch ge- kennzeichnet, dass an wenigstens einem der beiden axialen Enden des wenigsten
einen Kühlkanals (30, 32, 34, 46, 48, 50, 88, 90, 92) ein Verengungselement (36, 52, 54, 76, 78, 80) angeordnet ist. 5. dry-type transformer coil according to one of the preceding claims, character- ized in that at least one of the two axial ends of the least a cooling channel (30, 32, 34, 46, 48, 50, 88, 90, 92) a constriction element (36, 52, 54, 76, 78, 80) is arranged.
6. Trockentransformatorspule nach einem der vorherigen Ansprüche, dadurch ge- kennzeichnet, dass über den gesamten Umfang wenigstens einer Kühlkanalebene (24, 26, 28) Verengungselemente (36, 52, 54, 76, 78, 80) in den jeweiligen Kühlkanälen (30, 32, 34, 46, 48, 50, 88, 90, 92) vorgesehen sind. 6. dry-type transformer coil according to one of the preceding claims, characterized in that over the entire circumference of at least one cooling channel plane (24, 26, 28) constriction elements (36, 52, 54, 76, 78, 80) in the respective cooling channels (30, 32, 34, 46, 48, 50, 88, 90, 92) are provided.
7. Trockentransformatorspule nach einem der vorherigen Ansprüche, dadurch ge- kennzeichnet, dass das wenigstens eine Verengungselement (36, 52, 54, 76, 78, 80) derart ausgestaltet und angeordnet ist, dass bei steigender Temperatur der Strömungswiderstand durch den jeweiligen Kühlkanal (30, 32, 34, 46, 48, 50, 88, 90, 92) reduziert wird. 7. dry-type transformer coil according to one of the preceding claims, character- ized in that the at least one constriction element (36, 52, 54, 76, 78, 80) is configured and arranged such that with increasing temperature of the flow resistance through the respective cooling channel (30 , 32, 34, 46, 48, 50, 88, 90, 92).
8. Trockentransformatorspule nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass auch in wenigstens einem in einer radial innen (24) oder radial außen (28) liegenden Kühlkanalebene befindlichen Kühlkanal (30, 32, 34, 46, 48, 50, 88, 90, 92) ein Verengungselement (36, 52, 54, 76, 78, 80) angeordnet ist, welches den der jeweiligen Außenfläche des hohlzylindrischen Zwischenraumes (16) abge- wandten Querschnittsbereich des jeweiligen Kühlkanals (30, 32, 34, 46, 48, 50, 88, 90, 92) verengt. 8. dry-type transformer coil according to one of the preceding claims, characterized in that also in at least one in a radially inside (24) or radially outside (28) lying cooling channel plane located cooling channel (30, 32, 34, 46, 48, 50, 88, 90 , 92) a constricting element (36, 52, 54, 76, 78, 80) is arranged, which the the cross-sectional area of the respective cooling channel (30, 32, 34, 46, 48, 32) remote from the respective outer surface of the hollow cylindrical space (16). 50, 88, 90, 92).
9. Trockentransformator, umfassend einen Transformatorkern (62) und wenigstens eine Trockentransformatorspule nach einem der Ansprüche 1 bis 8. 9. dry-type transformer, comprising a transformer core (62) and at least one dry-type transformer coil according to one of claims 1 to 8.
10. Trockentransformator nach Anspruch 9, dadurch gekennzeichnet, dass dieser ein Fördermittel für Kühlluft aufweist.
10. Drying transformer according to claim 9, characterized in that it has a conveying means for cooling air.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13002006.8A EP2793244B1 (en) | 2013-04-17 | 2013-04-17 | Dry transformer coil and dry transformer |
| EP13002006.8 | 2013-04-17 |
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| Publication Number | Publication Date |
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| WO2014169997A1 true WO2014169997A1 (en) | 2014-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/EP2014/000949 WO2014169997A1 (en) | 2013-04-17 | 2014-04-09 | Dry-type transformer coil and dry-type transformer |
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| Country | Link |
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| EP (1) | EP2793244B1 (en) |
| WO (1) | WO2014169997A1 (en) |
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| CN116682639A (en) * | 2023-07-03 | 2023-09-01 | 河南龙翔电气股份有限公司 | Heat radiation structure of isolation transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2827346B1 (en) * | 2013-07-17 | 2016-11-16 | ABB Schweiz AG | Dry type transformer |
| CN104715896A (en) * | 2015-04-08 | 2015-06-17 | 薛建仁 | Novel epoxy-bucket iron core reactor adopting heat tube heat dissipation |
| WO2021081977A1 (en) | 2019-11-01 | 2021-05-06 | Abb Power Grids Switzerland Ag | Insulation assembly, transformer assembly, and dry type transformer |
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|---|---|---|---|---|
| CN102360833A (en) * | 2011-05-19 | 2012-02-22 | 云南通变电器有限公司 | Cellular epoxy resin insulation body for dry transformer |
| EP2439755A1 (en) * | 2010-10-08 | 2012-04-11 | ABB Technology AG | Dry-type electrical transformer |
| CN202405081U (en) * | 2011-12-24 | 2012-08-29 | 广东汇网电气有限公司 | Novel dry-transformer coil |
| CN202473553U (en) * | 2012-02-29 | 2012-10-03 | 山东威特变压器厂 | Dry type transformer |
-
2013
- 2013-04-17 EP EP13002006.8A patent/EP2793244B1/en active Active
-
2014
- 2014-04-09 WO PCT/EP2014/000949 patent/WO2014169997A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2439755A1 (en) * | 2010-10-08 | 2012-04-11 | ABB Technology AG | Dry-type electrical transformer |
| CN102360833A (en) * | 2011-05-19 | 2012-02-22 | 云南通变电器有限公司 | Cellular epoxy resin insulation body for dry transformer |
| CN202405081U (en) * | 2011-12-24 | 2012-08-29 | 广东汇网电气有限公司 | Novel dry-transformer coil |
| CN202473553U (en) * | 2012-02-29 | 2012-10-03 | 山东威特变压器厂 | Dry type transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116682639A (en) * | 2023-07-03 | 2023-09-01 | 河南龙翔电气股份有限公司 | Heat radiation structure of isolation transformer |
| CN116682639B (en) * | 2023-07-03 | 2023-12-08 | 河南龙翔电气股份有限公司 | Heat radiation structure of isolation transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2793244B1 (en) | 2015-07-08 |
| EP2793244A1 (en) | 2014-10-22 |
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