EP3690902B1 - Device for pressing a block comprising one or more windings of a static electric machine - Google Patents

Device for pressing a block comprising one or more windings of a static electric machine Download PDF

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Publication number
EP3690902B1
EP3690902B1 EP19154693.6A EP19154693A EP3690902B1 EP 3690902 B1 EP3690902 B1 EP 3690902B1 EP 19154693 A EP19154693 A EP 19154693A EP 3690902 B1 EP3690902 B1 EP 3690902B1
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EP
European Patent Office
Prior art keywords
hydraulic
coil
block
pressure
pressing
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EP19154693.6A
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German (de)
French (fr)
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EP3690902A1 (en
Inventor
Markus Stockner
Alexander Hackl
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Siemens Energy Global GmbH and Co KG
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Siemens Energy Global GmbH and Co KG
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Priority to EP19154693.6A priority Critical patent/EP3690902B1/en
Publication of EP3690902A1 publication Critical patent/EP3690902A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/303—Clamping coils, windings or parts thereof together

Definitions

  • the invention relates to a device for pressing a block of a static electrical machine having one or more windings, in particular a coil of a transformer, comprising a pressure element for transmitting a pressing force acting on the block in an axial direction of the block.
  • the invention relates to a static electrical machine, in particular an electrical transformer, comprising at least one block having one or more windings and at least one device of the type described above.
  • Such a device is from DE 32 36 740 A1 already known.
  • the pressing force is generated by a pull rod, which reaches through a pressing plate with its external thread at the end, so that a clamping force is introduced axially into the winding arrangement by screwing a nut onto the external thread.
  • a pneumatic hose is positioned between the squeeze plate and the coil assembly. If the winding arrangement comprises a plurality of windings arranged concentrically to one another, a pneumatic hose is provided for each of these windings.
  • the DE 25 47 833 A1 describes a device in which the clamping force for the winding is generated by hydraulic cylinders.
  • the mostly cylindrical coils are held on their base and a surface or cover surface opposite this base between two pressure elements, for example pressure plates or rings, or between a pressure element and a counter-holding element, and a suitable pressing force is applied via the pressure elements.
  • the pressing force is usually introduced into the pressure elements at several points and transferred to the coil via spacers placed on the surface and/or base of the coil.
  • An object of the invention is achieved by a device for pressing a block of a static electrical machine, in particular a coil of a transformer, having one or more coils or windings, the device comprising a pressure element for transmitting a pressing force acting on the block in an axial direction of the block, solved in that the device has at least one hydraulic element for arrangement between the pressure element and the block in order to regulate a distribution of a pressure acting on the block.
  • the pressing pressure can be distributed more evenly or directed to specific areas of the block.
  • static electrical machine refers to electrical transformers or reactors.
  • the hydraulic element between the pressure element which can be designed, for example, as a pressure plate, pressure segment, pressure segment chain, or as a pressure ring, and the block, in particular a base or surface of a substantially cylindrical coil of a transformer
  • a homogenized distribution of the pressure acting on the coil can be achieved by hydrostatic pressure equalization in the hydraulic element or, in the case of several hydraulic elements, in all hydraulic elements, whereby, among other things, a better short-circuit resistance of the block, especially the coil, can be achieved .
  • the number of points at which the pressing force is introduced into the pressure element can also be reduced.
  • all windings can be subjected to the same pressure, or the pressure acting on each individual winding can be selected separately.
  • pressure fluctuations can be specifically compensated for by passive or active pressure regulation in the hydraulic element or in the hydraulic elements. The frequencies of these pressure fluctuations can be as high as desired within the ranges that occur in static electrical machines.
  • the vibration behavior of the windings can be influenced in a targeted manner by regulating the pressure acting on the block, in particular the coil, which also allows the overall noise development of the static electric machine, in particular the transformer, to be influenced.
  • age-related or thermal pressure fluctuations can be compensated;
  • piezo actuators high-frequency pressure fluctuations can also be compensated.
  • the pressing of the block can be done by attaching a single device according to the invention, for example to the base or to the surface of the coil, or by attaching a device according to the invention to the base of the coil and another device according to the surface of the coil opposite the base and attaching the Pressing force is introduced into the coil via both of these devices according to the invention.
  • the hydraulic element is formed by at least one hydraulic hose.
  • hydraulic hoses as hydraulic elements is primarily due to the high degree of flexibility in their arrangement between the pressure element and the coil.
  • the arrangement of the hydraulic hose or, in the case of several hydraulic hoses, all hydraulic hoses can vary depending on whether the entire base or surface of the coil is to be subjected to the same pressure, or whether individual windings are to be subjected to a targeted increase or decrease in pressure be flexibly adjusted.
  • the hydraulic hose is arranged to run in a spiral shape in relation to a longitudinal axis of the coil.
  • This measure according to the invention makes it possible to apply the same pressure to the entire base or surface of the coil using a single hydraulic hose.
  • the hydraulic hose can spiral from a center of the coil towards one of the base or surface terminating the jacket edge of the coil can be arranged running.
  • the entire hydraulic element can be controlled by a single control device.
  • a transformer comprising at least one coil and at least one device of the type described above, the at least one, preferably each, hydraulic element being pressed between the pressure element and the coil.
  • the pressing force introduced into the pressure element is transmitted to the coil via the hydraulic element, for example via one or more hydraulic hoses or via a combination arrangement of hydraulic hoses and hydraulic cylinders.
  • the hydraulic element according to the invention By using the hydraulic element according to the invention, a particularly homogeneous distribution of the resulting pressure acting on the coil can be achieved over the base or surface of the coil.
  • At least one, preferably several, spacers are particularly preferably arranged between the hydraulic element and the coil.
  • the spacers are elements that are rigid in shape and are arranged between the hydraulic element and the individual windings of the coil in order to optimize the power transmission to the coil and to allow the oil flow necessary for cooling when the transformer is in operation.
  • a substantially cylindrical coil 1 of a transformer is clamped between a device according to the invention and a counter-holding element, not shown.
  • the device according to the invention comprises a pressure element 2 and a hydraulic element 4 which is arranged between the pressure element 2 and a surface 9 of the spool 1 .
  • the surface 9 is opposite a base 8 of the coil 1, on which base 8 the coil 1 is in engagement with the counter-holding element.
  • the coil 1 in particular windings of the coil 1—is pressed between the counter-holding element and the device according to the invention.
  • a pressing force is introduced via several force introduction points into the pressure element 2, which can be designed as a pressure plate or pressure ring, of the device and subsequently transmitted to the coil 1 via the hydraulic element 4 and the spacers 6.
  • the pressing force has at least one component which acts on the coil 1 along an axial direction 3 of the coil 1, the The axial direction runs parallel to a longitudinal axis 5 of the coil 1 .
  • FIG. 2 shows the arrangement 1 , A further device according to the invention being provided instead of the counter-holding element. This is therefore arranged on the base surface 8 of the spool 1 and also applies a pressing force to the spool 1, which acts on the spool 1 in the axial direction of the spool 1 and is thus directed in the opposite direction to the pressing force which is arranged on the surface 9 of the spool 1 Device is transferred to the coil 1.
  • the amount of pressing forces transmitted via the two devices can be identical or different.
  • the hydraulic elements 4 of the devices are connected to one another via a hydraulic connection 7, so that differences in the pressing forces acting on the two pressure elements 2 are compensated for due to the hydrostatic pressure equalization.
  • the printing element 2 is in front of the plane of the drawing and is therefore not visible.
  • the pressing force acts in each case in the axial direction 3, which is normal to the plane of the drawing and penetrates into it.
  • the hydraulic element 4 of the device is formed by a single hydraulic hose. This is arranged to run spirally around the center point of the surface 9 or around the longitudinal axis 5 of the coil 1 and is provided with a single control device 10 .
  • the hydraulic element 4 is formed by four concentrically arranged hydraulic hoses, which are connected to one another and to a single control device 10 via a hydraulic connection 7 .
  • each of the hydraulic hoses can be subjected to a specific pressure separately.
  • the hydraulic element 4 is formed by a plurality of arc-shaped hydraulic hoses and by a plurality of hydraulic cylinders.
  • the individual hydraulic hoses can either be hydraulically connected to one another and provided with a common control device 10, or not connected to one another and each provided with its own control device 10; The same applies to the individual hydraulic cylinders.
  • Separate hydraulic hoses and hydraulic cylinders can be applied separately with a specific pressure.
  • the hydraulic element 4 is formed by a plurality of radially arranged hydraulic hoses.
  • the individual hydraulic hoses are not connected to one another and are therefore each provided with their own control device 10 .
  • the individual hydraulic hoses can each be separately subjected to a specific pressure.
  • the embodiment variant according to 7 only a single control device 10, the individual hydraulic hoses being connected to one another via a hydraulic connection 7.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • General Induction Heating (AREA)

Description

Gebiet der Erfindungfield of invention

Die Erfindung betrifft eine Vorrichtung zum Pressen eines eine oder mehrere Wicklungen aufweisenden Blockes einer statischen elektrischen Maschine, insbesondere einer Spule eines Transformators, umfassend ein Druckelement zur Übertragung einer in eine Axialrichtung des Blockes auf den Block wirkenden Presskraft.The invention relates to a device for pressing a block of a static electrical machine having one or more windings, in particular a coil of a transformer, comprising a pressure element for transmitting a pressing force acting on the block in an axial direction of the block.

Des Weiteren betrifft die Erfindung eine statische elektrische Maschine, insbesondere einen elektrischen Transformator, umfassend zumindest einen eine oder mehrere Wicklungen aufweisenden Block sowie zumindest eine Vorrichtung der oben beschriebenen Art.Furthermore, the invention relates to a static electrical machine, in particular an electrical transformer, comprising at least one block having one or more windings and at least one device of the type described above.

Stand der TechnikState of the art

Eine solche Vorrichtung ist aus der DE 32 36 740 A1 bereits bekannt. Bei der dort offenbarten Vorrichtung wird die Presskraft von einer Zugstange erzeugt, die eine Pressplatte mit ihrem endseitigen Außengewinde durchgreift, so dass durch Aufschrauben einer Mutter auf das Außengewinde eine Spannkraft axial in die Wicklungsanordnung eingeleitet wird. Zwischen der Pressplatte und der Wicklungsanordnung ist ein pneumatischer Schlauch angeordnet. Umfasst die Wicklungsanordnung mehrere konzentrisch zueinander angeordnete Wicklungen ist für jede dieser Wicklungen ein pneumatischer Schlauch vorgesehen.Such a device is from DE 32 36 740 A1 already known. In the device disclosed there, the pressing force is generated by a pull rod, which reaches through a pressing plate with its external thread at the end, so that a clamping force is introduced axially into the winding arrangement by screwing a nut onto the external thread. A pneumatic hose is positioned between the squeeze plate and the coil assembly. If the winding arrangement comprises a plurality of windings arranged concentrically to one another, a pneumatic hose is provided for each of these windings.

Die DE 25 47 833 A1 beschreibt eine Vorrichtung, bei der die Spannkraft für die Wicklung durch Hydraulikzylinder erzeugt wird.the DE 25 47 833 A1 describes a device in which the clamping force for the winding is generated by hydraulic cylinders.

Um die für den sicheren Betrieb notwendige mechanische Stabilität von Spulen eines elektrischen Transformators sicherzustellen, werden diese in der Regel mechanisch gepresst.In order to ensure the mechanical stability of coils of an electrical transformer, which is necessary for safe operation, they are usually mechanically pressed.

Zu diesem Zweck werden die meist zylinderförmigen Spulen an ihrer Grundfläche und einer dieser Grundfläche gegenüberliegenden Oberfläche bzw. Deckfläche zwischen zwei Druckelementen, beispielsweise Druckplatten bzw. -ringen, oder zwischen einem Druckelement und einem Gegenhalteelement gehalten und über die Druckelemente mit einer geeigneten Presskraft beaufschlagt. Die Presskraft wird dabei meist an mehreren Stellen in die Druckelemente eingeleitet und über auf der Ober- und/oder Grundfläche der Spule platzierte Abstandhalter auf die Spule übertragen.For this purpose, the mostly cylindrical coils are held on their base and a surface or cover surface opposite this base between two pressure elements, for example pressure plates or rings, or between a pressure element and a counter-holding element, and a suitable pressing force is applied via the pressure elements. The pressing force is usually introduced into the pressure elements at several points and transferred to the coil via spacers placed on the surface and/or base of the coil.

Aufgrund der lokalen Beaufschlagung der Druckplatte mit der Presskraft kommt es jedoch zu einer inhomogenen Verteilung des auf die Spule wirkenden Pressdruckes, was sich in einer Über- oder Unterpressung der Wicklungen äußern und die Lebensdauer des Transformators beeinträchtigen kann. Insbesondere im Falle einer Unterpressung können auch Probleme im Kurzschlussfall auftreten.Due to the local loading of the pressure plate with the pressing force, however, there is an inhomogeneous distribution of the pressing pressure acting on the coil, which can manifest itself in over- or under-pressing of the windings and affect the service life of the transformer. Problems can also arise in the event of a short circuit, particularly in the case of an underpressurization.

Um eine homogenere Druckverteilung zu erreichen, sind mehrere Maßnahmen bekannt - etwa die Vergrößerung der Druckelemente, das Vorsehen zusätzlicher und breiterer Unterlagen an den Druckeinleitungsstellen, sowie die Erhöhung der Anzahl der Druckeinleitungsstellen. All diese Maßnahmen gehen jedoch mit einem erhöhten Aufwand in der Fertigung des jeweiligen Transformators einher und führen somit zu höheren Fertigungskosten.In order to achieve a more homogeneous pressure distribution, several measures are known - such as enlarging the pressure elements, providing additional and wider bases at the pressure introduction points, and increasing the number of pressure introduction points. However, all of these measures are associated with increased effort in the production of the respective transformer and thus lead to higher production costs.

Aufgabe der Erfindungobject of the invention

Es ist somit eine Aufgabe der Erfindung, die oben genannten Nachteile zu vermeiden und eine Vorrichtung zum Pressen eines eine oder mehrere Spulen oder Wicklungen aufweisenden Blockes einer statischen elektrischen Maschine, insbesondere eines Transformators, bereitzustellen, mittels welcher insbesondere die Unterpressung und Überpressung von Spulen oder Wicklungen des Blockes vermieden werden kann.It is therefore an object of the invention to avoid the disadvantages mentioned above and to provide a device for pressing a block of a static electrical machine, in particular a transformer, having one or more coils or windings, by means of which in particular the underpressing and overpressing of coils or windings of the block can be avoided.

Weitere der Erfindung zu Grunde liegenden Aufgaben werden aus der nachfolgenden Beschreibung der Erfindung deutlich.Other objects underlying the invention will become clear from the following description of the invention.

Darstellung der ErfindungPresentation of the invention

Eine Aufgabe der Erfindung wird durch eine Vorrichtung zum Pressen einer eine oder mehrere Spulen oder Wicklungen aufweisenden Blockes einer statischen elektrischen Maschine, insbesondere einer Spule eines Transformators, wobei die Vorrichtung ein Druckelement zur Übertragung einer in eine Axialrichtung des Blockes auf den Block wirkenden Presskraft umfasst, gelöst, indem die Vorrichtung zumindest ein Hydraulikelement zur Anordnung zwischen dem Druckelement und dem Block aufweist, um eine Verteilung eines auf den Block wirkenden Pressdruckes zu regeln. Etwa kann der Pressdruck gleichmäßiger verteilt oder aber gezielt in bestimmte Bereiche des Blockes eingeleitet werden.An object of the invention is achieved by a device for pressing a block of a static electrical machine, in particular a coil of a transformer, having one or more coils or windings, the device comprising a pressure element for transmitting a pressing force acting on the block in an axial direction of the block, solved in that the device has at least one hydraulic element for arrangement between the pressure element and the block in order to regulate a distribution of a pressure acting on the block. For example, the pressing pressure can be distributed more evenly or directed to specific areas of the block.

Im Kontext der vorliegenden Erfindung bezeichnet der Ausdruck "statische elektrische Maschine" elektrische Transformatoren oder Reaktoren.In the context of the present invention, the term "static electrical machine" refers to electrical transformers or reactors.

Durch die Verwendung des Hydraulikelementes zwischen dem Druckelement, welches beispielsweise als Druckplatte, Drucksegment, Drucksegmentkette, oder als Druckring ausgebildet sein kann, und dem Block, insbesondere einer Grund- oder Oberfläche einer im Wesentlichen zylinderförmigen Spule eines Transformators, kann durch den hydrostatischen Druckausgleich im Hydraulikelement bzw., im Falle mehrerer Hydraulikelemente, in allen Hydraulikelementen eine homogenisierte Verteilung des auf die Spule wirkenden Pressdruckes erreicht werden, wodurch unter anderem eine bessere Kurzschlussfestigkeit des Blockes, insbesondere der Spule, erreicht werden kann. Dadurch kann auch die Anzahl jener Stellen, an denen die Presskraft in das Druckelement eingeleitet wird, reduziert werden. Bei Blöcken, insbesondere Spulen, mit mehreren Wicklungen können alle Wicklungen mit dem gleichen Pressdruck beaufschlagt werden, oder es kann der auf jede einzelne Wicklung wirkende Pressdruck separat gewählt werden. Durch passive oder aktive Druckregelung in dem Hydraulikelement bzw. in den Hydraulikelementen können zudem Druckschwankungen gezielt kompensiert werden. Die Frequenzen dieser Druckschwankungen können dabei, im Rahmen der in statischen elektrischen Maschinen auftretenden Bereiche, beliebig hoch sein. Weiters wird es möglich, einen konstanten hydraulischen Pressdruck vorzugeben; durch den Einsatz einer mit dem Hydraulikelement in Wirkverbindung stehenden Regeleinrichtung kann ein für den Block, insbesondere die Spule, optimaler Pressdruck während der gesamten Lebenszeit der statischen elektrischen Maschine, insbesondere des Transformators, garantiert werden. Zusätzlich kann durch Regelung des auf den Block, insbesondere die Spule, wirkenden Pressdrucks das Schwingungsverhalten der Wicklungen gezielt beeinflusst werden, wodurch sich auch die Geräuschentwicklung der statischen elektrischen Maschine, insbesondere des Transformators, insgesamt beeinflussen lässt. Außerdem können, beispielsweise alterungsbedingte oder thermische, Druckschwankungen ausgeglichen werden; etwa durch den Einsatz von Piezoaktuatoren können so auch hochfrequente Druckschwankungen kompensiert werden. Durch Überwachung eines Betriebszustandes des Hydraulikelementes kann der im Betriebszustand der statischen elektrischen Maschine, insbesondere des Transformators, vorherrschende Pressdruck überwacht werden. Die Pressung des Blockes, insbesondere der Spule, kann erfolgen, indem eine einzige erfindungsgemäße Vorrichtung beispielsweise an die Grundfläche oder an die Oberfläche der Spule angebracht wird, oder indem eine erfindungsgemäße Vorrichtung an die Grundfläche der Spule und eine weitere erfindungsgemäße Vorrichtung an die der Grundfläche gegenüberliegende Oberfläche der Spule angebracht wird und die Presskraft über beide dieser erfindungsgemäßen Vorrichtungen in die Spule eingeleitet wird.By using the hydraulic element between the pressure element, which can be designed, for example, as a pressure plate, pressure segment, pressure segment chain, or as a pressure ring, and the block, in particular a base or surface of a substantially cylindrical coil of a transformer, a homogenized distribution of the pressure acting on the coil can be achieved by hydrostatic pressure equalization in the hydraulic element or, in the case of several hydraulic elements, in all hydraulic elements, whereby, among other things, a better short-circuit resistance of the block, especially the coil, can be achieved . As a result, the number of points at which the pressing force is introduced into the pressure element can also be reduced. In the case of blocks, in particular coils, with a plurality of windings, all windings can be subjected to the same pressure, or the pressure acting on each individual winding can be selected separately. In addition, pressure fluctuations can be specifically compensated for by passive or active pressure regulation in the hydraulic element or in the hydraulic elements. The frequencies of these pressure fluctuations can be as high as desired within the ranges that occur in static electrical machines. Furthermore, it is possible to specify a constant hydraulic pressure; By using a control device that is operatively connected to the hydraulic element, an optimum pressing pressure for the block, in particular the coil, can be guaranteed over the entire service life of the static electric machine, in particular the transformer. In addition, the vibration behavior of the windings can be influenced in a targeted manner by regulating the pressure acting on the block, in particular the coil, which also allows the overall noise development of the static electric machine, in particular the transformer, to be influenced. In addition, for example, age-related or thermal pressure fluctuations can be compensated; For example, by using piezo actuators, high-frequency pressure fluctuations can also be compensated. By monitoring an operating state of the hydraulic element, the pressure that prevails in the operating state of the static electrical machine, in particular the transformer, can be monitored. The pressing of the block, especially the Coil, can be done by attaching a single device according to the invention, for example to the base or to the surface of the coil, or by attaching a device according to the invention to the base of the coil and another device according to the surface of the coil opposite the base and attaching the Pressing force is introduced into the coil via both of these devices according to the invention.

Im Rahmen der Erfindung ist es vorgesehen, dass das Hydraulikelement durch zumindest einen Hydraulikschlauch ausgebildet ist.In the context of the invention, it is provided that the hydraulic element is formed by at least one hydraulic hose.

Sämtliche der im Folgenden im Zusammenhang mit der Spule eines Transformators getätigten Aussagen treffen analog im Zusammenhang mit dem eine oder mehrere Spulen oder Wicklungen umfassenden Block einer statischen elektrischen Maschine zu.All of the statements made below in connection with the coil of a transformer apply analogously in connection with the block of a static electrical machine comprising one or more coils or windings.

Die Verwendung von Hydraulikschläuchen als Hydraulikelemente bietet sich vor allem aufgrund der hohen Flexibilität bei deren Anordnung zwischen Druckelement und Spule an. Je nachdem, ob die gesamte Grund- bzw. Oberfläche der Spule mit demselben Pressdruck beaufschlagt werden soll, oder ob einzelne Wicklungen gezielt mit einem erhöhten oder verringerten Pressdruck beaufschlagt werden sollen, kann die Anordnung des Hydraulikschlauches bzw., im Falle mehrerer Hydraulikschläuche, aller Hydraulikschläuche flexibel angepasst werden.The use of hydraulic hoses as hydraulic elements is primarily due to the high degree of flexibility in their arrangement between the pressure element and the coil. The arrangement of the hydraulic hose or, in the case of several hydraulic hoses, all hydraulic hoses can vary depending on whether the entire base or surface of the coil is to be subjected to the same pressure, or whether individual windings are to be subjected to a targeted increase or decrease in pressure be flexibly adjusted.

Im Rahmen der Erfindung ist vorgesehen, dass der Hydraulikschlauch bezogen auf eine Längsachse der Spule spiralförmig verlaufend angeordnet ist.It is provided within the scope of the invention that the hydraulic hose is arranged to run in a spiral shape in relation to a longitudinal axis of the coil.

Durch diese erfindungsgemäße Maßnahme wird es möglich, die gesamte Grund- bzw. Oberfläche der Spule mittels eines einzigen Hydraulikschlauches mit demselben Pressdruck zu beaufschlagen. Dabei kann der Hydraulikschlauch von einem Zentrum der Spule spiralförmig in Richtung einer die Grund- bzw. Oberfläche abschließenden Mantelkante der Spule verlaufend angeordnet sein. Das gesamte Hydraulikelement kann dabei mittels einer einzigen Regeleinrichtung geregelt werden.This measure according to the invention makes it possible to apply the same pressure to the entire base or surface of the coil using a single hydraulic hose. The hydraulic hose can spiral from a center of the coil towards one of the base or surface terminating the jacket edge of the coil can be arranged running. The entire hydraulic element can be controlled by a single control device.

Eine der Erfindung zu Grunde liegende Aufgabe wird auch durch einen Transformator umfassend zumindest eine Spule sowie zumindest eine Vorrichtung der vorhergehend beschriebenen Art gelöst, wobei das zumindest eine, vorzugsweise jedes, Hydraulikelement zwischen dem Druckelement und der Spule gepresst ist.One of the objects on which the invention is based is also achieved by a transformer comprising at least one coil and at least one device of the type described above, the at least one, preferably each, hydraulic element being pressed between the pressure element and the coil.

Dabei wird die in das Druckelement eingeleitete Presskraft über das Hydraulikelement, also beispielsweise über einen oder mehrere Hydraulikschläuche oder über eine Kombinationsanordnung von Hydraulikschläuchen und -zylindern, auf die Spule übertragen. Durch den Einsatz des erfindungsgemäßen Hydraulikelementes kann eine über die Grund- bzw. Oberfläche der Spule besonders homogene Verteilung des resultierenden, auf die Spule wirkenden Pressdruckes erreicht werden.The pressing force introduced into the pressure element is transmitted to the coil via the hydraulic element, for example via one or more hydraulic hoses or via a combination arrangement of hydraulic hoses and hydraulic cylinders. By using the hydraulic element according to the invention, a particularly homogeneous distribution of the resulting pressure acting on the coil can be achieved over the base or surface of the coil.

Besonders bevorzugt ist zwischen dem Hydraulikelement und der Spule zumindest ein, vorzugsweise mehrere, Abstandhalter angeordnet.At least one, preferably several, spacers are particularly preferably arranged between the hydraulic element and the coil.

Bei den Abstandhaltern handelt es sich um im Vergleich zu dem Hydraulikelement formstarre Elemente, welche zwischen dem Hydraulikelement und den einzelnen Windungen der Spule angeordnet sind, um die Kraftübertragung auf die Spule zu optimieren sowie einen im Betriebszustand des Transformators zur Kühlung nötigen Ölfluss zuzulassen.Compared to the hydraulic element, the spacers are elements that are rigid in shape and are arranged between the hydraulic element and the individual windings of the coil in order to optimize the power transmission to the coil and to allow the oil flow necessary for cooling when the transformer is in operation.

Kurze Beschreibung der FigurenShort description of the figures

Im Folgenden wird die Erfindung anhand von Ausführungsbeispielen näher erläutert. Die Zeichnungen, auf die dabei Bezug genommen wird, sind beispielhaft und sollen die Erfindung zwar darlegen, sie aber keinesfalls einengen oder gar abschließend wiedergeben.The invention is explained in more detail below using exemplary embodiments. The drawings, on to which reference is made are examples and are intended to illustrate the invention, but in no way restrict or even exhaustively reproduce it.

Die Zeichnungen stellen die Vorrichtung auf einem Transformatorschenkel eines Aktivteils dar. Dabei zeigt

Fig. 1
eine schematische Darstellung einer Spule eines elektrischen Transformators mit einer an der Oberfläche der Spule angebrachten Vorrichtung,
Fig. 2
eine schematische Darstellung einer Spule eines elektrischen Transformators mit einer an der Oberfläche der Spule angebrachten Vorrichtung sowie einer weiteren, an der Grundfläche der Spule angebrachten Vorrichtung,
Fig. 3
eine Schnittansicht gemäß Schnittlinie A-A aus Fig. 1 einer erfindungsgemäßen Ausführungsvariante, wobei das Hydraulikelement durch einen spiralförmig angeordneten Hydraulikschlauch ausgebildet ist,
Fig. 4
eine Schnittansicht gemäß Schnittlinie A-A aus Fig. 1 einer Ausführungsvariante, die nicht teil der Erfindung wie beansprucht ist,
wobei
das Hydraulikelement durch konzentrisch angeordnete Hydraulikschläuche ausgebildet ist,
Fig. 5
eine Schnittansicht gemäß Schnittlinie A-A aus Fig. 1 einer Ausführungsvariante, die nicht teil der Erfindung wie beansprucht ist, wobei das Hydraulikelement durch mehrere kreisbogenförmige Hydraulikschläuche sowie durch mehrere Hydraulikzylinder ausgebildet ist,
Fig. 6
eine Schnittansicht gemäß Schnittlinie A-A aus Fig. nicht teil 1 einer Ausführungsvariante, die der Erfindung wie beansprucht ist, wobei das Hydraulikelement durch mehrere radial verlaufend angeordnete Hydraulikschläuche ausgebildet ist, und
Fig. 7
eine Schnittansicht gemäß Schnittlinie A-A aus Fig. 1 einer Ausführungsvariante, die nicht teil der Erfindung wie beansprucht ist, wobei das Hydraulikelement durch mehrere radial verlaufend angeordnete und hydraulisch miteinander verbundene Hydraulikschläuche ausgebildet ist.
The drawings represent the device on a transformer leg of an active part
1
a schematic representation of a coil of an electrical transformer with a device attached to the surface of the coil,
2
a schematic representation of a coil of an electrical transformer with a device attached to the surface of the coil and another device attached to the base of the coil,
3
a sectional view according to section line AA 1 an embodiment variant according to the invention, wherein the hydraulic element is formed by a hydraulic hose arranged in a spiral shape,
4
a sectional view according to section line AA 1 a variant not forming part of the invention as claimed,
whereby
the hydraulic element is formed by concentrically arranged hydraulic hoses,
figure 5
a sectional view according to section line AA 1 an embodiment variant which is not part of the invention as claimed, the hydraulic element being formed by a plurality of arc-shaped hydraulic hoses and by a plurality of hydraulic cylinders,
6
a sectional view according to section line AA from Fig. not part 1 of an embodiment variant of the invention as claimed, wherein the hydraulic element is formed by a plurality of radially arranged hydraulic hoses, and
7
a sectional view according to section line AA 1 an embodiment variant which is not part of the invention as claimed, wherein the hydraulic element is formed by a plurality of hydraulic hoses which are arranged to run radially and are hydraulically connected to one another.

Wege zur Ausführung der ErfindungWays to carry out the invention

Die grundsätzliche Funktionsweise der erfindungsgemäßen Vorrichtung wird durch Fig. 1 veranschaulicht. Eine im Wesentlichen zylinderförmige Spule 1 eines Transformators ist dabei zwischen einer erfindungsgemäßen Vorrichtung und einem nicht dargestellten Gegenhalteelement eingespannt.The basic operation of the device according to the invention is through 1 illustrated. A substantially cylindrical coil 1 of a transformer is clamped between a device according to the invention and a counter-holding element, not shown.

Die erfindungsgemäße Vorrichtung umfasst ein Druckelement 2 sowie ein Hydraulikelement 4, welches zwischen dem Druckelement 2 und einer Oberfläche 9 der Spule 1 angeordnet ist. Die Oberfläche 9 liegt einer Grundfläche 8 der Spule 1 gegenüber, an welcher Grundfläche 8 die Spule 1 mit dem Gegenhalteelement in Eingriff steht. Zwischen dem Hydraulikelement 4 und der Oberfläche 9 der Spule 1 befinden sich mehrere Abstandhalter 6, welche im Vergleich zu dem Hydraulikelement 4 formstarr ausgebildet sind.The device according to the invention comprises a pressure element 2 and a hydraulic element 4 which is arranged between the pressure element 2 and a surface 9 of the spool 1 . The surface 9 is opposite a base 8 of the coil 1, on which base 8 the coil 1 is in engagement with the counter-holding element. Between the hydraulic element 4 and the surface 9 of the coil 1 there are several spacers 6 which are dimensionally rigid compared to the hydraulic element 4 .

Um der Spule 1 die für einen sicheren Betrieb des Transformators erforderliche mechanische Stabilität zu verleihen, wird die Spule 1 - insbesondere Wicklungen der Spule 1 - zwischen dem Gegenhalteelement und der erfindungsgemäßen Vorrichtung gepresst. Dazu wird eine Presskraft über mehrere Krafteinleitungsstellen in das Druckelement 2, welches als Druckplatte oder Druckring ausgebildet sein kann, der Vorrichtung eingeleitet und in weiterer Folge über das Hydraulikelement 4 und die Abstandhalter 6 auf die Spule 1 übertragen. Die Presskraft hat dabei zumindest eine Komponente, welche entlang einer Axialrichtung 3 der Spule 1 auf die Spule 1 wirkt, wobei die Axialrichtung parallel zu einer Längsachse 5 der Spule 1 verläuft.In order to give the coil 1 the mechanical stability required for safe operation of the transformer, the coil 1—in particular windings of the coil 1—is pressed between the counter-holding element and the device according to the invention. For this purpose, a pressing force is introduced via several force introduction points into the pressure element 2, which can be designed as a pressure plate or pressure ring, of the device and subsequently transmitted to the coil 1 via the hydraulic element 4 and the spacers 6. The pressing force has at least one component which acts on the coil 1 along an axial direction 3 of the coil 1, the The axial direction runs parallel to a longitudinal axis 5 of the coil 1 .

Durch den Einsatz des Hydraulikelementes 4 kann eine verglichen mit herkömmlichen Pressvorrichtungen homogene Verteilung des resultierenden Pressdruckes, welcher auf die Spule 1 bzw. auf die Oberfläche 9 der Spule 1 wirkt, erzielt werden. Dies wird insbesondere aufgrund des hydrostatischen Druckausgleichs im Hydraulikelement bzw., im Falle mehrerer Hydraulikelemente, in allen Hydraulikelementen erreicht.By using the hydraulic element 4, a homogeneous distribution of the resulting pressing pressure, which acts on the coil 1 or on the surface 9 of the coil 1, can be achieved compared to conventional pressing devices. This is achieved in particular due to the hydrostatic pressure equalization in the hydraulic element or, in the case of several hydraulic elements, in all hydraulic elements.

Fig. 2 zeigt die Anordnung aus Fig. 1, wobei anstelle des Gegenhalteelementes eine weitere erfindungsgemäße Vorrichtung vorgesehen ist. Diese ist demnach an der Grundfläche 8 der Spule 1 angeordnet und beaufschlagt die Spule 1 ebenfalls mit einer Presskraft, welche in Axialrichtung der Spule 1 auf die Spule 1 wirkt und somit jener Presskraft entgegengerichtet ist, welche über die auf der Oberfläche 9 der Spule 1 angeordnete Vorrichtung auf die Spule 1 übertragen wird. 2 shows the arrangement 1 , A further device according to the invention being provided instead of the counter-holding element. This is therefore arranged on the base surface 8 of the spool 1 and also applies a pressing force to the spool 1, which acts on the spool 1 in the axial direction of the spool 1 and is thus directed in the opposite direction to the pressing force which is arranged on the surface 9 of the spool 1 Device is transferred to the coil 1.

Grundsätzlich können die über die beiden Vorrichtungen übertragenen Presskräfte betragsmäßig identisch oder verschieden sein. In dem in Fig. 2 dargestellten Ausführungsbeispiel sind die Hydraulikelemente 4 der Vorrichtungen über eine hydraulische Verbindung 7 miteinander Verbunden, sodass aufgrund des hydrostatischen Druckausgleiches Unterschiede in den auf die beiden Druckelemente 2 wirkenden Presskräften ausgeglichen werden.In principle, the amount of pressing forces transmitted via the two devices can be identical or different. in the in 2 In the exemplary embodiment shown, the hydraulic elements 4 of the devices are connected to one another via a hydraulic connection 7, so that differences in the pressing forces acting on the two pressure elements 2 are compensated for due to the hydrostatic pressure equalization.

Die Fig. 3, 4, 5, 6 und 7 zeigen jeweils eine Schnittansicht gemäß Schnittlinie A-A (siehe Fig. 1), jedoch jeweils für unterschiedliche Ausführungsvarianten derthe 3, 4, 5, 6 and 7 each show a sectional view according to section line AA (see 1 ), but each for different variants of the

Vorrichtung. Jedoch zeigt nur Fig. 3 eine erfindungsgemäße Ausführungsvariante. Das Druckelement 2 liegt dabei vor der Zeichenebene und ist daher nicht zu sehen. Die Presskraft wirkt jeweils in Axialrichtung 3, welche normal auf die Zeichenebene steht und in diese eindringt.Contraption. However, only shows 3 an embodiment of the invention. The printing element 2 is in front of the plane of the drawing and is therefore not visible. The pressing force acts in each case in the axial direction 3, which is normal to the plane of the drawing and penetrates into it.

In Fig. 3 ist das Hydraulikelement 4 der Vorrichtung durch einen einzigen Hydraulikschlauch ausgebildet. Dieser ist spiralförmig verlaufend um den Mittelpunkt der Oberfläche 9 bzw. um die Längsachse 5 der Spule 1 angeordnet und mit einer einzigen Regeleinrichtung 10 versehen.In 3 the hydraulic element 4 of the device is formed by a single hydraulic hose. This is arranged to run spirally around the center point of the surface 9 or around the longitudinal axis 5 of the coil 1 and is provided with a single control device 10 .

In Fig. 4 ist das Hydraulikelement 4 durch vier konzentrisch angeordnete Hydraulikschläuche ausgebildet, welche über eine hydraulische Verbindung 7 miteinander sowie mit einer einzigen Regeleinrichtung 10 verbunden sind.In 4 the hydraulic element 4 is formed by four concentrically arranged hydraulic hoses, which are connected to one another and to a single control device 10 via a hydraulic connection 7 .

Es sind jedoch auch solche, Fig. 4 entsprechenden Ausführungsbeispiele erfasst, bei denen die konzentrischen Hydraulikschläuche nicht miteinander verbunden sind und jeder Hydraulikschlauch mit einer eigenen Regeleinrichtung 10 versehen ist. Somit kann jeder einzelne der Hydraulikschläuche separat mit einem bestimmten Pressdruck beaufschlagt werden.However, there are also those 4 corresponding exemplary embodiments, in which the concentric hydraulic hoses are not connected to one another and each hydraulic hose is provided with its own control device 10. Thus, each of the hydraulic hoses can be subjected to a specific pressure separately.

In Fig. 5 ist das Hydraulikelement 4 durch mehrere kreisbogenförmige Hydraulikschläuche sowie durch mehrere Hydraulikzylinder ausgebildet. Dabei können die einzelnen Hydraulikschläuche entweder hydraulisch miteinander verbunden und mit einer gemeinsamen Regeleinrichtung 10 versehen sein, oder aber nicht miteinander verbunden und jeweils mit einer eigenen Regeleinrichtung 10 versehen sein; Selbiges gilt für die einzelnen Hydraulikzylinder. Separate Hydraulikschläuche und Hydraulikzylinder können dabei separat mit einem bestimmten Pressdruck beaufschlagt werden.In figure 5 the hydraulic element 4 is formed by a plurality of arc-shaped hydraulic hoses and by a plurality of hydraulic cylinders. The individual hydraulic hoses can either be hydraulically connected to one another and provided with a common control device 10, or not connected to one another and each provided with its own control device 10; The same applies to the individual hydraulic cylinders. Separate hydraulic hoses and hydraulic cylinders can be applied separately with a specific pressure.

In Fig. 6 und Fig. 7 ist das Hydraulikelement 4 durch mehrere radial verlaufend angeordnete Hydraulikschläuche ausgebildet. In der in Fig. 6 abgebildeten Ausführungsvariante sind die einzelnen Hydraulikschläuche nicht miteinander verbunden und sind daher jeweils mit einer eigenen Regeleinrichtung 10 versehen. Hier können die einzelnen Hydraulikschläuche jeweils separat mit einem bestimmten Pressdruck beaufschlagt werden. Hingegen umfasst die Ausführungsvariante gemäß Fig. 7 lediglich eine einzige Regeleinrichtung 10, wobei die einzelnen Hydraulikschläuche über eine hydraulische Verbindung 7 miteinander verbunden sind.In 6 and 7 the hydraulic element 4 is formed by a plurality of radially arranged hydraulic hoses. in the in 6 In the illustrated embodiment, the individual hydraulic hoses are not connected to one another and are therefore each provided with their own control device 10 . Here, the individual hydraulic hoses can each be separately subjected to a specific pressure. In contrast, the embodiment variant according to 7 only a single control device 10, the individual hydraulic hoses being connected to one another via a hydraulic connection 7.

BezugszeichenReference sign

11
SpuleKitchen sink
22
Druckelementpressure element
33
Axialrichtungaxial direction
44
Hydraulikelementhydraulic element
55
Längsachselongitudinal axis
66
Abstandhalterspacers
77
hydraulische Verbindunghydraulic connection
88th
GrundflächeFloor space
99
Oberflächesurface
1010
Regeleinrichtungcontrol device

Claims (5)

  1. Device for pressing a block, which has one or more windings, of a static electrical machine, preferably a coil (1) of a transformer, comprising a pressure element (2) for transmitting a pressing force acting on the block in an axial direction (3) of the block, wherein the device has at least one hydraulic element (4) for arrangement between the pressure element (2) and the block in order to control a distribution of a pressing pressure acting on the block, characterized in that the hydraulic element (4) is formed by at least one hydraulic hose and the hydraulic hose is arranged so as to run in the form of a spiral with respect to a longitudinal axis (5) of the block.
  2. Static electrical machine comprising at least one block, which has one or more windings, and also at least one device according to Claim 1, wherein the at least one, preferably each, hydraulic element (4) is pressed between the pressure element (2) and the block.
  3. Static electrical machine according to Claim 2, characterized in that at least one spacer (6), preferably a plurality of spacers (6), is/are arranged between the hydraulic element (4) and the block.
  4. Static electrical machine according to either of Claims 2 and 3, wherein it is in the form of an electrical transformer and wherein the block is in the form of a coil (1) of the transformer.
  5. Static electrical machine according to either of Claims 2 and 3, wherein it is in the form of an electrical reactor and wherein the block is in the form of a coil (1) of the reactor.
EP19154693.6A 2019-01-31 2019-01-31 Device for pressing a block comprising one or more windings of a static electric machine Active EP3690902B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19154693.6A EP3690902B1 (en) 2019-01-31 2019-01-31 Device for pressing a block comprising one or more windings of a static electric machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19154693.6A EP3690902B1 (en) 2019-01-31 2019-01-31 Device for pressing a block comprising one or more windings of a static electric machine

Publications (2)

Publication Number Publication Date
EP3690902A1 EP3690902A1 (en) 2020-08-05
EP3690902B1 true EP3690902B1 (en) 2022-08-10

Family

ID=65275957

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19154693.6A Active EP3690902B1 (en) 2019-01-31 2019-01-31 Device for pressing a block comprising one or more windings of a static electric machine

Country Status (1)

Country Link
EP (1) EP3690902B1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE386534B (en) * 1974-11-08 1976-08-09 Asea Ab HYDRAULIC TRAILER TRANSFORMATION CLAMPING DEVICE
JPS5749211A (en) * 1980-09-08 1982-03-23 Mitsubishi Electric Corp Electromagnetic induction device
DE3236740C2 (en) * 1982-10-04 1984-08-09 Schorch GmbH, 4050 Mönchengladbach Device for pressing windings of transformers and reactors
JPS59121816A (en) * 1982-12-27 1984-07-14 Toshiba Corp Tightening device of wiring

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