EP0040382B1 - Sheet-wound coil for a transformer filled with a liquid dielectric - Google Patents
Sheet-wound coil for a transformer filled with a liquid dielectric Download PDFInfo
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- EP0040382B1 EP0040382B1 EP81103568A EP81103568A EP0040382B1 EP 0040382 B1 EP0040382 B1 EP 0040382B1 EP 81103568 A EP81103568 A EP 81103568A EP 81103568 A EP81103568 A EP 81103568A EP 0040382 B1 EP0040382 B1 EP 0040382B1
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- sheet
- winding
- tape
- cooling element
- turns
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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
- H01F27/323—Insulation between winding turns, between winding layers
Definitions
- the invention relates to a strip winding for a liquid-insulated transformer according to the preamble of claim 1.
- the ribs are glued to form a so-called rib mat on one side of a pressboard sheet, as a result of which the pressboard sheet forms a wall in the channel lying against the winding.
- Ribs are also used in barrier insulation made of pressingsheets and oil between parts with different potential, such as. B. between a winding coil and an outside of the same winding coil in a transformer used to create the required distance between the pressings in the barrier insulation.
- As a substitute for such barrier insulation it has been proposed for cylindrical barrier insulation to use curled (corrugated) pressboard sheets together with smooth pressboard sheets, the latter being arranged between the corrugated sheets.
- the smooth arches ensure that wave crests of a curved sheet do not fall into troughs of an adjacent corrugated sheet, so that longitudinal channels for the oil are formed between the sheets.
- Corrugated pressingsheets are not suitable for forming cooling channels in tape windings because they do not have sufficient dimensional stability.
- an insulating tape for a cylinder winding is known, as it is used for crucible induction furnaces. With such a cylindrical coil, the windings are arranged next to one another in the axial direction of the cylinder.
- the insulating tape has the task of isolating adjacent turns from each other and keeping them at a distance.
- the width of the insulating tape is adapted to the radial width of the conductor and consists in the longitudinal direction of spaced-apart spacing elements which are connected to one another by webs which are substantially thinner than the spacing elements perpendicular to the longitudinal direction of the tape.
- Crosspieces and spacer elements form a homogeneous band which, together with the winding of the coil, can be wrapped between adjacent turns.
- the radial channels created by the webs also ensure good ventilation of the coil.
- This known tape is obviously not suitable for creating axial cooling channels in a tape winding.
- the z. B. between hardened rollers can be brought into the desired shape and then hardened.
- Such a plastic cannot be impregnated, so that this tape is also not suitable for liquid-insulated (oil) transformers.
- the insulating liquid could not penetrate into the inevitable cavities in the material of the insulating tape, so that the tape material would be destroyed by mica in the cavities.
- Such a known tape can only be used for drying spools, such as those used for. B. used in crucible induction furnaces.
- the invention has for its object to develop a tape winding of the type mentioned, in which the cooling elements are superior to the known cooling elements in terms of both their manufacture and their nature.
- the cooling element consists of a press washer, in which grooves are incorporated on both sides, for example by milling, the remaining material on the sides of the grooves forming the spacer elements and the remaining material on the bottom of the grooves forming the connecting pieces.
- a cooling element can be produced in a simple manner, for example in that the press clamping disk is guided past a plurality of parallel saw blades attached to its underside and a plurality of parallel saw blades. The waste generated during sawing can be used to manufacture new clamping washers.
- the tape of the tape winding consists of a layered electrical conductor material and layered insulating material attached to at least one side of this conductor material.
- the conductor material is preferably a metal foil, such as. B. an aluminum or copper foil, which usually has a thickness between 5 and 3000 I Lm in heavy current transformers (power transformers).
- the insulating material is preferably a film made of polymer which can withstand a continuous temperature of at least 90 ° C. Examples of suitable polymers for the film include polyethylene glycol terephthalate, polycarbonate and polyimide. A suitable thickness of the film is between 5-200 wm, preferably between 10-100 ⁇ m.
- the spacer elements 11 which is shown in a section perpendicular to the longitudinal direction, consists of spacer elements 11, which extend along the entire length of the cooling element, and between the spacer elements 11 arranged connecting pieces 12, which also extend along the entire length of the Extend cooling element.
- the height h of the spacer elements is expediently 1-10 mm and preferably 2-6 mm.
- the distance d between adjacent spacer elements is advantageously 1-10 mm and preferably 2-6 mm.
- the thickness t of the connecting pieces is advantageously 0.05-5 mm and preferably 0.1-3 mm, but at most 90% of the height h of the spacer elements.
- FIG. 1 is produced in the manner indicated in FIG. 2, the cooling element consisting of pressboard.
- a pressboard 13 is guided between support rollers 14 past a plurality of parallel saw blades 15 arranged on the top of the pressboard, which work the grooves denoted by 16 in FIG. 1 into the plates.
- the grooves denoted by 18 in FIG. 1 are incorporated into the particle board on the underside of the particle board by the parallel saw blades 17.
- the material that remains to the side of the grooves on the top and bottom of the press clamping disk forms the spacer elements 11, while the remaining material at the bottom of the grooves forms the connecting pieces 12, one of which is shown in broken lines in FIG. 2.
- FIG. 3 and 4 show a leg 19a and the upper and lower yokes 19b and 19c of the iron core of a power transformer.
- the inner winding 21 designed as a low-voltage winding, which is surrounded by the outer winding 22 designed as a high-voltage winding, sits on the leg 19a. Both windings are constructed as band windings.
- the two windings are arranged coaxially, and a cylindrical ring-shaped space is formed between them, in which ribs 23 made of pressboard, bakelite or glass fiber-reinforced polyester are attached parallel to the longitudinal axis of the windings.
- the inner winding is wound on a forme cylinder 24.
- the winding 21 (FIG. 5) is made up of a plurality of turns of a tape which consists of a metal foil 30 and an insulating film 31.
- a cooling element 10 of the type shown in FIGS. 1 and 2 is arranged between two successive turns of the band, the spacer elements 11 and the connecting pieces 12 running parallel to the axis of the winding and extending over the entire axial length of the winding.
- the spacer elements in the exemplary embodiment have a height h of 4 mm and a width b of 3 mm, and the distance d between them is 4 mm.
- the thickness t of the connecting pieces is 0.2 mm.
- the spacer elements keep the adjacent turns of the tape in the winding at a distance, so that channels 32 and 33 are formed.
- Insulating liquid such as. B. transformer oil, is passed through these channels in the winding 21 (and accordingly in the winding 22).
- the insulating liquid is conducted from an annular liquid supply device 34 arranged on one end face 35 of the winding to the other end face 36 of the winding (FIG. 4).
- the insulating liquid in the channels 32 and 33 comes into direct contact Contact with the tape of the winding, ie there is no pressboard layer between this tape and the insulating liquid. In this way, extremely effective cooling of the winding is achieved.
- the flow of the insulating liquid can be forced by a pump which is arranged in a flow circuit, which also includes the feed device 34, the cooling channels 32 and 33 in the windings and the space 37 outside the windings in the transformer tank.
- the spacer elements 11 with the connecting pieces 12 can also be arranged in a different way, for example running spirally between the band windings from one end face 35 to the other end face 36.
- the connectors 12 need only extend along part of the length of the spacers; for example, they can consist of short pieces, between which gaps are free of spacer material. This creates connections between the channels 32 and 33.
- the spacer elements 11 can be provided with transverse notches, holes or other recesses, via which a connection is established between channels 32 and / or channels 33 adjacent in the tangential direction of the winding.
- the cooling element also need not consist of a single integral unit, which extends from one end face of the winding to the other.
- the cooling element also need not be arranged between two adjacent turns of the tape winding. Rather, the cooling element according to the invention can also be arranged within the innermost turn of a tape winding, for. B. between the form cylinder 24 and the winding 21, and / or outside the outermost turn of a tape winding, z. B. between the winding 21 and the ribs 23rd
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Insulating Of Coils (AREA)
- Soft Magnetic Materials (AREA)
- Braking Arrangements (AREA)
- Transformer Cooling (AREA)
Description
Die Erfindung betrifft eine Bandwicklung für einen flüssigkeitsisolierten Transformator gemäß dem Oberbegriff des Anspruches 1.The invention relates to a strip winding for a liquid-insulated transformer according to the preamble of claim 1.
Es ist bekannt, die inneren Bereiche einer Bandwicklung eines flüssigkeitsisolierten Transformators oder einer flüssigkeitsisolierten Drossel dadurch zu kühlen, daß die Isolierflüssigkeit durch besondere in der Wicklung angeordnete Kanäle zirkuliert wird. Bei einer bekannten Konstruktion zur Schaffung von Kühlkanälen, die sich von dem einen stirnseitigen Ende der Wicklung zum anderen stirnseitigen Ende der Wicklung erstrecken, werden parallel zur Symmetrieachse der Wicklung im Abstand voneinander Rippen aus Preßspan zwischen zwei benachbarten Windungen der Bandwicklung angeordnet.It is known to cool the inner regions of a tape winding of a liquid-insulated transformer or a liquid-insulated choke by circulating the insulating liquid through special channels arranged in the winding. In a known construction for the creation of cooling channels, which extend from one end face of the winding to the other end face of the winding, ribs of pressboard are arranged parallel to the axis of symmetry of the winding at a distance from one another between two adjacent windings of the band winding.
Um das Anbringen der Rippen mit einem angemessenen Arbeitsaufwand zu ermöglichen, sind die Rippen dabei zur Bildung einer sogenannten Rippenmatte auf eine Seite eines Preßspanbogens geleimt, wodurch der Preßspanbogen eine an der Wicklung anliegende Wand im Kanal bildet.In order to enable the ribs to be attached with a reasonable amount of work, the ribs are glued to form a so-called rib mat on one side of a pressboard sheet, as a result of which the pressboard sheet forms a wall in the channel lying against the winding.
Rippen werden auch in Barrierenisolationen aus Preßspanbögen und Öl zwischen Teilen mit unterschiedlichem Potential, wie z. B. zwischen einer Wicklungsspule und einer außerhalb derselben liegenden anderen Wicklungsspule in einem Transformator, verwendet, um in der Barrierenisolation den erforderlichen Abstand zwischen den Preßspanbögen zu schaffen. Als Ersatz für solche Barrierenisolationen hat man für zylindrische Barrierenisolationen die Verwendung kurrugierter (gewellter) Preßspanbögen zusammen mit glatten Preßspanbögen vorgeschlagen, wobei die letztgenannten zwischen den korrugierten Bögen angeordnet sind. Durch die glatten Bögen wird sichergestellt, daß Wellenberge eines kurrugierten Bogens nicht in Wellentäler eines angrenzenden korrugierten Bogens fallen, so daß zwischen den Bögen in Längsrichtung verlaufende Kanäle für das Öl gebildet werden. Korrugierte Preßspanbögen sind zur Bildung von Kühlkanälen in Bandwicklungen nicht geeignet, da sie keine genügende Formfestigkeit haben. Rippen oder alternative Bauteile zur Bildung von Kühlkanälen in einer Bandwicklung müssen nämlich einem hohen Druck standhalten. Dies hängt einerseits damit zusammen, daß das bandförmige Material mit Zugvorspannung gewickelt werden muß, um einen so großen radialen Druck zu erzeugen, daß die Wicklung homogen wird und auch dann kein Spiel aufweist, wenn der Leiter beim Aufwickeln nicht ganz eben ist, und andererseits damit, daß bei Kurzschlüssen große radial gerichtete Kräfte auftreten.Ribs are also used in barrier insulation made of pressingsheets and oil between parts with different potential, such as. B. between a winding coil and an outside of the same winding coil in a transformer used to create the required distance between the pressings in the barrier insulation. As a substitute for such barrier insulation, it has been proposed for cylindrical barrier insulation to use curled (corrugated) pressboard sheets together with smooth pressboard sheets, the latter being arranged between the corrugated sheets. The smooth arches ensure that wave crests of a curved sheet do not fall into troughs of an adjacent corrugated sheet, so that longitudinal channels for the oil are formed between the sheets. Corrugated pressingsheets are not suitable for forming cooling channels in tape windings because they do not have sufficient dimensional stability. Ribs or alternative components for the formation of cooling channels in a tape winding have to withstand high pressure. This is due on the one hand to the fact that the band-shaped material has to be wound with tensile pretension in order to generate such a large radial pressure that the winding becomes homogeneous and has no play even when the conductor is not completely level during winding, and on the other hand with it that large radially directed forces occur in the event of short circuits.
Aus der FR-A-2 369 668 ist ein Isolierband für eine Zylinderwicklung bekannt, wie sie für Schmelztiegel-Induktionsöfen verwendet wird. Bei einer solchen zylindrischen Spule sind die Windungen in Achsrichtung des Zylinders nebeneinander angeordnet. Das Isolierband hat die Aufgabe, benachbarte Windungen gegeneinander zu isolieren und auf Abstand zu halten. Das Isolierband ist in seiner Breite der radialen Breite des Leiters angepaßt und besteht in Längsrichtung aus im Abstand voneinander angeordneten Distanzelementen, die durch Stege miteinander verbunden sind, die senkrecht zur Längsrichtung des Bandes wesentlich dünner als die Distanzelemente sind.From FR-A-2 369 668 an insulating tape for a cylinder winding is known, as it is used for crucible induction furnaces. With such a cylindrical coil, the windings are arranged next to one another in the axial direction of the cylinder. The insulating tape has the task of isolating adjacent turns from each other and keeping them at a distance. The width of the insulating tape is adapted to the radial width of the conductor and consists in the longitudinal direction of spaced-apart spacing elements which are connected to one another by webs which are substantially thinner than the spacing elements perpendicular to the longitudinal direction of the tape.
Stege und Distanzelemente bilden ein homogenes Band, welches zusammen mit dem Wikkein der Spule zwischen benachbarten Windungen eingewickelt werden kann. Die durch die Stege geschaffenen radialen Kanäle sorgen zugleich für eine gute Belüftung der Spule. Zur Schaffung von axialen Kühlkanälen bei einer Bandwicklung ist dieses bekannte Band offensichtlich nicht geeignet. Außerdem wird als Material für dieses Band in der FR-A-2 369 668 härtbarer Kunststoff vorgeschlagen, der z. B. zwischen gehärteten Walzen in die gewünschte Form gebracht und anschließend gehärtet werden kann. Ein solcher Kunststoff ist nicht imprägnierbar, so daß dieses Band auch nicht für flüssigkeitsisolierte (Öl) Transformatoren in Betracht kommt. Die Isolierflüssigkeit könnte nicht in die unvermeidlich vorkommenden Hohlräume im Material des Isolierbandes eindringen, so daß das Bandmaterial durch Glimmerscheinungen in den Hohlräumen zerstört werden würde. Ein solches bekanntes Band ist ausschließlich für Trokkenspulen verwendbar, wie sie z. B. bei Schmelztiegel-Induktionsöfen verwendet werden.Crosspieces and spacer elements form a homogeneous band which, together with the winding of the coil, can be wrapped between adjacent turns. The radial channels created by the webs also ensure good ventilation of the coil. This known tape is obviously not suitable for creating axial cooling channels in a tape winding. In addition, as a material for this tape in FR-A-2 369 668 curable plastic is proposed, the z. B. between hardened rollers can be brought into the desired shape and then hardened. Such a plastic cannot be impregnated, so that this tape is also not suitable for liquid-insulated (oil) transformers. The insulating liquid could not penetrate into the inevitable cavities in the material of the insulating tape, so that the tape material would be destroyed by mica in the cavities. Such a known tape can only be used for drying spools, such as those used for. B. used in crucible induction furnaces.
Der Erfindung liegt die Aufgabe zugrunde, eine Bandwicklung der eingangs genannten Art zu entwickeln, bei der die Kühlelemente sowohl hinsichtlich ihrer Herstellung als auch ihrer Beschaffenheit den bekannten Kühlelementen überlegen sind.The invention has for its object to develop a tape winding of the type mentioned, in which the cooling elements are superior to the known cooling elements in terms of both their manufacture and their nature.
Zur Lösung dieser Aufgabe wird eine Bandwicklung nach dem Oberbegriff des Anspruches 1 vorgeschlagen, welcher erfindungsgemäß die im kennzeichnenden Teil des Anspruches 1 genannten Merkmale hat.To solve this problem, a tape winding is proposed according to the preamble of claim 1, which according to the invention has the features mentioned in the characterizing part of claim 1.
Durch die Erfindung ist es möglich, die Kühlung einer Bandwicklung durch Verwendung eines Kühlelementes vorzunehmen, welches gegenüber der bekannten Rippenmatte erhebliche Vorteile hat. Das gemäß der Erfindung verwendete Kühlelement bewirkt eine bessere Kühlung, da es einen direkten Kontakt zwischen der Isolierflüssigkeit und der Wicklung ermöglicht, d. h., zwischen Isolierflüssigkeit und Wicklungsmaterial ist keine Preßspanschicht mehr vorhanden. Außerdem ist das Kühlelement billiger als die bekannte Rippenmatte, da bei ihm im Gegensatz zur Rippenmatte, bei der die Rippen manuell auf den Preßspanbogen geklebt werden müssen, maschinelle und kontinuierliche Herstellungsverfahren möglich sind. Ein weiterer Vorteil besteht darin, daß bei dem Kühlelement nach der Erfindung im Gegensatz zur Rippenmatte kein Leim verwendet wird, dessen Anwesenheit die dielektrische Festigkeit verschlechtern kann. Außerdem hat das neue Kühlelement im Gegensatz zu korrugierten Bögen eine ausreichende Formfestigkeit.The invention makes it possible to cool a strip winding by using a cooling element, which has considerable advantages over the known ribbed mat. The cooling element used according to the invention provides better cooling, since it enables direct contact between the insulating liquid and the winding, ie there is no longer a chipboard layer between the insulating liquid and the winding material. In addition, the cooling element is cheaper than the known ribbed mat, since in contrast to the ribbed mat, in which the ribs have to be glued manually onto the press sheet, mechanical and continuous production processes are possible. Another advantage is that in the cooling element according to the invention in contrast to the rib mat no glue is used, the presence of which can impair the dielectric strength. In addition, in contrast to corrugated bends, the new cooling element has sufficient dimensional stability.
Das Kühlelement besteht aus einer Preßspanscheibe, bei der auf beiden Seiten, zum Beispiel durch Fräsen, Nuten eingearbeitet sind, wobei das verbleibende Material an den Seiten der Nuten die Distanzelemente bildet und das verbleibende Material am Boden der Nuten die Verbindungsstücke bildet. Ein solches Kühlelement kann auf einfache Weise hergestellt werden, beispielsweise dadurch, daß die Preßspanscheibe an mehreren an ihrer Unterseite und mehreren an ihrer Oberseite angebrachten parallelen Sägeblättern vorbeigeführt wird. Der beim Sägen anfallende Abfall kann zur Herstellung neuer Preßspanscheiben verwendet werden.The cooling element consists of a press washer, in which grooves are incorporated on both sides, for example by milling, the remaining material on the sides of the grooves forming the spacer elements and the remaining material on the bottom of the grooves forming the connecting pieces. Such a cooling element can be produced in a simple manner, for example in that the press clamping disk is guided past a plurality of parallel saw blades attached to its underside and a plurality of parallel saw blades. The waste generated during sawing can be used to manufacture new clamping washers.
Das Band der Bandwicklung besteht aus einem schichtförmigen elektrischen Leitermaterial und wenigstens auf einer Seite dieses Leitermaterials angebrachtem schichtförmigem Isoliermaterial. Bei dem Leitermaterial handelt es sich vorzugsweise um eine Metallfolie, wie z. B. einer Aluminium- oder Kupferfolie, die bei Starkstromtransformatoren (Leistungstransformatoren) normalerweise eine zwischen 5 und 3000 ILm liegende Dicke hat. Das Isoliermaterial ist vorzugsweise ein Film aus Polymer, der eine Dauertemperatur von wenigstens 90° C verträgt. Als Beispiel für geeignete Polymere für den Film können u. a. Polyäthylenglykolterephtalat, Polykarbonat und Polyimid genannt werden. Eine geeignete Dicke des Films liegt zwischen 5-200 wm, vorzugsweise zwischen 10-100 µm.The tape of the tape winding consists of a layered electrical conductor material and layered insulating material attached to at least one side of this conductor material. The conductor material is preferably a metal foil, such as. B. an aluminum or copper foil, which usually has a thickness between 5 and 3000 I Lm in heavy current transformers (power transformers). The insulating material is preferably a film made of polymer which can withstand a continuous temperature of at least 90 ° C. Examples of suitable polymers for the film include polyethylene glycol terephthalate, polycarbonate and polyimide. A suitable thickness of the film is between 5-200 wm, preferably between 10-100 µm.
Anhand der in den Figuren gezeigten Ausführungsbeispiele soll die Erfindung näher erläutert werden. Es zeigt
- Fig. 1 ein Ausführungsbeispiel eines Kühlelementes für eine Bandwicklung gemäß der Erfindung im Schnitt senkrecht zur Längsachse der Bandwicklung, für die das Kühlelement bestimmt ist,
- Fig. schematisch eine Vorrichtung zur Herstellung des Kühlelementes gemäß Fig. 1,
- Fig. 3 einen Querschnitt durch einen Schenkel eines Transformators mit zwei Bandwicklungen gemäß der Erfindung,
- Fig. 4 den Transformatorschenkel gemäß Fig. 3 in seitlicher Schnittdarstellung einschließlich der an den Schenkeln sich anschließenden Jochteile,
- Fig. 5 im größeren Maßstab einen Schnitt durch einen Teil einer der Wicklungen gemäß Fig. 3 und 4 senkrecht zur Längsachse der Bandwicklung.
- 1 shows an embodiment of a cooling element for a tape winding according to the invention in section perpendicular to the longitudinal axis of the tape winding, for which the cooling element is intended,
- 1 schematically shows a device for producing the cooling element according to FIG. 1,
- 3 shows a cross section through one leg of a transformer with two tape windings according to the invention,
- 4 shows the transformer leg according to FIG. 3 in a lateral sectional view including the yoke parts adjoining the legs,
- Fig. 5 on a larger scale a section through part of one of the windings according to FIGS. 3 and 4 perpendicular to the longitudinal axis of the tape winding.
Das Kühlelement 10 nach Fig. 1, das in einem Schnitt senkrecht zur Längsrichtung gezeigt wird, besteht aus Distanzelementen 11, die sich entlang der gesamten Länge des Kühlelementes erstrecken, sowie zwischen den Distanzelementen 11 angeordneten Verbindungsstücken 12, die sich ebenfalls entlang der gesamten Länge des Kühlelementes erstrecken. Die Höhe h der Distanzelemente beträgt zweckmäßig 1-10 mm und vorzugsweise 2-6 mm. Der Abstand d zwischen benachbarten Distanzelementen beträgt zweckmäßig 1-10 mm und vorzugsweise 2-6 mm. Die Dicke t der Verbindungsstücke beträgt zweckmäßig 0,05-5 mm und vorzugsweise 0,1-3 mm, jedoch höchstens 90% der Höhe h der Distanzelemente.1, which is shown in a section perpendicular to the longitudinal direction, consists of
Die Herstellung eines Kühlelementes nach Fig. 1 erfolgt nach der in Fig. 2 angedeuteten Weise, wobei das Kühlelement aus Preßspan besteht. Eine Preßspanplatte 13 wird zwischen Stützrollen 14 an mehreren auf der Oberseite der Preßspanplatte angeordneten parallelen Sägeblättern 15 vorbeigeführt, welche die in Fig. 1 mit 16 bezeichneten Nuten in die Platten einarbeiten. Entsprechend werden an der Unterseite der Preßspanscheibe durch die parallel angeordneten Sägeblätter 17 die in Fig. 1 mit 18 bezeichneten Nuten in die Preßspanplatte eingearbeitet. Das seitlich der Nuten stehenbleibende Material auf der Ober- und Unterseite der Preßspanscheibe bildet die Distanzelemente 11, während das verbleibende Material am Boden der Nuten die Verbindungsstücke 12 bildet, von denen in Fig. 2 eines gestrichelt dargestellt ist.1 is produced in the manner indicated in FIG. 2, the cooling element consisting of pressboard. A
Die Fig. 3 und 4 zeigen einen Schenkel 19a sowie das obere und untere Joch 19b und 19c des Eisenkerns eines Starkstromtransformators. Auf dem Schenkel 19a sitzt die als Niederspannungswicklung ausgebildete Innenwicklung 21, die von der als Hochspannungswicklung ausgebildeten Außenwicklung 22 umgeben ist. Beide Wicklungen sind als Bandwicklungen aufgebaut. Die beiden Wicklungen sind koaxial angeordnet, und zwischen ihnen wird ein zylinderringförmiger Raum gebildet, in dem Rippen 23 aus Preßspan, Bakelit oder glasfaserarmiertem Polyester parallel zur Längsachse der Wicklungen angebracht sind. Die Innenwicklung ist auf einen Formzylinder 24 gewickelt. In der Innenwicklung sind zwei Kühlelemente 25 und 26 und in der Außenwicklung zwei Kühlelemente 27 und 28 gemäß der Erfindung angeordnet. Diese Kühlelemente sind alle von gleicher Art, weshalb nur eines von ihnen, das mit 25 bezeichnet ist, in größerem Maßstab in Fig. 5 zusammen mit den unmittelbar umgebenden Teilen der Wicklung 21 dargestellt ist.3 and 4 show a
Die Wicklung 21 ist (Fig. 5) aus mehreren Windungen eines Bandes aufgebaut, das aus einer Metallfolie 30 und einem Isolierfilm 31 besteht. Zwischen zwei aufeinander folgenden Windungen des Bandes ist ein Kühlelement 10 der in den Fig. 1 und 2 gezeigten Art angeordnet, wobei die Distanzelemente 11 und die Verbindungsstücke 12 parallel zur Achse der Wicklung verlaufen und sich über die gesamte axiale Länge der Wicklung erstrecken. Die Distanzelemente haben in dem Ausführungsbeispiel eine Höhe h von 4 mm und eine Breite b von 3 mm, und der Abstand d zwischen ihnen beträgt 4 mm. Die Dicke t der Verbindungsstücke beträgt 0,2 mm. Wie aus der Figur hervorgeht, halten die Distanzelemente die ihnen benachbarten Windungen des Bandes in der Wicklung auf Abstand, so daß Kanäle 32 und 33 gebildet werden. lsolierflüssigkeit, wie z. B. Transformatorenöl, wird durch diese Kanäle in der Wicklung 21 (und entsprechend in der Wicklung 22) geleitet. Die Isolierflüssigkeit wird von einer an einer Stirnfläche 35 der Wicklung angeordneten ringförmigen Flüssigkeitszufuhrvorrichtung 34 zu der anderen Stirnfläche 36 der Wicklung geleitet (Fig. 4). Dadurch, daß die Verbindungsstücke 12 einen Abstand von der (gedachten) Ebene haben, in der diejenigen Flächen der Distanzelemente 11 liegen, die auf das Band der Wicklung gerichtet sind und an diesem Band anliegen, kommt die Isolierflüssigkeit in den Kanälen 32 und 33 in direkten Kontakt mit dem Band der Wicklung, d. h. zwischen diesem Band und der Isolierflüssigkeit ist keine Preßspanschicht vorhanden. Hierdurch wird eine außerordentlich wirksame Kühlung der Wicklung erreicht. Die Strömung der Isolierflüssigkeit kann durch eine Pumpe erzwungen werden, die in einem Strömungskreis angeordnet ist, zu dem außerdem die Zuführvorrichtung 34, die Kühlkanäle 32 und 33 in den Wicklungen und der Raum 37 außerhalb der Wicklungen im Transformatorkessel gehören. Die Distanzelemente 11 mit den Verbindungsstücken 12 können auch in anderer Weise, beispielsweise spiralförmig zwischen den Bandwindungen von einer Stirnfläche 35 zur anderen Stirnfläche 36 verlaufend, angeordnet sein. Ferner brauchen sich die Verbindungsstücke 12 nur längs eines Teils der Länge der Distanzelemente zu erstrecken; sie können beispielsweise aus kurzen Stücken bestehen, zwischen denen Lükken frei von Distanzelementmaterial liegen. Hierdurch werden Verbindungen zwischen den Kanälen 32 und 33 geschaffen. Ferner können die Distanzelemente 11 mit querverlaufenden Kerben, Löchern oder sonstigen Ausnehmungen versehen sein, über die eine Verbindung zwischen in tangentialer Richtung der Wicklung benachbarten Kanälen 32 und/oder Kanälen 33 zustande kommt. Das Kühlelement braucht auch nicht aus einer einzigen integralen Einheit zu bestehen, die sich von dem einem stirnseitigen Ende der Wicklung zum anderen erstreckt. Vielmehr kann das Kühlelement aus mehreren in Achsrichtung der Wicklung kürzeren Teilen bestehen, die in Achsrichtung der Wicklung hintereinander angeordnet sind. Das Kühlelement braucht auch nicht in Wicklungsrichtung des Bandes (Umfangsrichtung) als ein einziges integrales Teil ausgebildet zu sein, sondern es kann aus mehreren in der genannten Richtung hintereinander angeordneten Teilen bestehen.The winding 21 (FIG. 5) is made up of a plurality of turns of a tape which consists of a
Das Kühlelement braucht auch nicht zwischen zwei benachbarten Windungen der Bandwicklung angeordnet zu werden. Vielmehr kann das Kühlelement nach der Erfindung auch innerhalb der innersten Windung einer Bandwicklung angeordnet werden, z. B. zwischen dem Formzylinder 24 und der Wicklung 21, und/oder außerhalb der äußersten Windung einer Bandwicklung angeordnet werden, z. B. zwischen der Wicklung 21 und den Rippen 23.The cooling element also need not be arranged between two adjacent turns of the tape winding. Rather, the cooling element according to the invention can also be arranged within the innermost turn of a tape winding, for. B. between the
Claims (1)
- Sheet-wound coil (21, 22) for a transformer with an isulating liquied or a reactor with an insulating liquid with at least one cooling element (10, 25, 26, 27, 28) disposed between two consecutive turns or sections of such two turns of the coil sheet (30, 31) or within the innermost turn of the coil sheet or outside the outermost turn of the coil sheet, which cooling element comprises elongated parallel spacers (11), being connected with one another and being laterally spaced apart from one another and keeping apart said two turns or sections of said two turns of the sheet to form channels (32, 33) between the two turns, or which cooling elements form channels within the innermost turn of the sheet, or which cooling elements form channels outside the outermost turn of the sheet, all these channels being provided to conduct insulating liquid from one endface of the sheet-wound coil to its other endface, whereby the spacers (11) are laterally joined by connecting means (12) each connecting means being spaced from the mathematical planes in which the sheet-confronting faces of the spacers (11) are located, characterized in that the cooling element (10) consists of a plate of pressboard (13), in which grooves (16, 18) are provided from both sides, so that the material remaining at the sides of the grooves constitutes the spacers (11) and the material remaining at the bottom of the grooves constitutes said connecting means (12).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8003782 | 1980-05-21 | ||
| SE8003782A SE421570B (en) | 1980-05-21 | 1980-05-21 | WITH ISOLERATED COOL BAND WINDING FOR A TRANSFORMER OR REACTOR |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0040382A1 EP0040382A1 (en) | 1981-11-25 |
| EP0040382B1 true EP0040382B1 (en) | 1984-08-08 |
Family
ID=20341004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81103568A Expired EP0040382B1 (en) | 1980-05-21 | 1981-05-11 | Sheet-wound coil for a transformer filled with a liquid dielectric |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0040382B1 (en) |
| JP (1) | JPS5717117A (en) |
| CA (1) | CA1157115A (en) |
| DE (1) | DE3165362D1 (en) |
| DK (1) | DK220181A (en) |
| NO (1) | NO811694L (en) |
| SE (1) | SE421570B (en) |
| ZA (1) | ZA813337B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6812583B2 (en) | 2002-02-19 | 2004-11-02 | Rockwell Scientific Licensing, Llc | Electrical generator with ferrofluid bearings |
| DE102016221992A1 (en) | 2016-11-09 | 2018-05-09 | Siemens Aktiengesellschaft | Core for an electrical induction device |
| DE102017208814A1 (en) | 2017-05-24 | 2018-11-29 | Isotek Gmbh | Spacer tape, transformer winding and transformer and the method for producing a spacer strip |
| EP3859760A1 (en) | 2020-01-30 | 2021-08-04 | ABB Power Grids Switzerland AG | Method and conductor structure for manufacturing an electric winding of an electromagnetic induction apparatus |
| EP4210076A1 (en) | 2022-01-05 | 2023-07-12 | Hitachi Energy Switzerland AG | Spacer element for a winding, kit, method for manufacturing a winding and winding |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR633246A (en) * | 1926-04-24 | 1928-01-25 | Siemens Schuckertwerke Gmbh | Disc-shaped coil for transformers |
| GB718748A (en) * | 1951-07-27 | 1954-11-17 | Gen Electric | Improvements in and relating to stationary electrical induction apparatus |
| GB962222A (en) * | 1959-10-29 | 1964-07-01 | English Electric Co Ltd | Improvements in or relating to inductive windings |
| US3195084A (en) * | 1962-05-23 | 1965-07-13 | Westinghouse Electric Corp | Electrical apparatus having foil wound windings and metallic duct formers |
| CH422145A (en) * | 1961-12-15 | 1966-10-15 | Westinghouse Electric Corp | Winding for transformers or chokes |
| US3464043A (en) * | 1967-10-16 | 1969-08-26 | Allis Chalmers Mfg Co | Conductor strip transformer winding having improved short circuit strength |
| GB1242401A (en) * | 1967-11-07 | 1971-08-11 | Bruce Peebles Ind Ltd | Transformer or reactor winding |
| FR2369668A1 (en) * | 1976-10-29 | 1978-05-26 | Bbc Brown Boveri & Cie | Insulator for conductors of coil for coreless induction furnace - with strip between and following curvature of conductors |
| FR2410345A1 (en) * | 1977-11-28 | 1979-06-22 | Siemens Ag | PROCESS FOR MOUNTING A MAGNETIC SUPPRACONDUCTOR WINDING |
| DE2947801A1 (en) * | 1978-12-08 | 1980-06-19 | Asea Ab | Transformer or choke coil with strip winding - uses metal foil, firmly connected to each polymer film of strip, all turns of strip coil interconnected by respective polymer films |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3514730A (en) * | 1968-03-27 | 1970-05-26 | Atomic Energy Commission | Cooling spacer strip for superconducting magnets |
-
1980
- 1980-05-21 SE SE8003782A patent/SE421570B/en not_active IP Right Cessation
-
1981
- 1981-05-11 EP EP81103568A patent/EP0040382B1/en not_active Expired
- 1981-05-11 DE DE8181103568T patent/DE3165362D1/en not_active Expired
- 1981-05-19 DK DK220181A patent/DK220181A/da not_active Application Discontinuation
- 1981-05-19 JP JP7432581A patent/JPS5717117A/en active Pending
- 1981-05-19 NO NO811694A patent/NO811694L/en unknown
- 1981-05-19 ZA ZA00813337A patent/ZA813337B/en unknown
- 1981-05-20 CA CA000377944A patent/CA1157115A/en not_active Expired
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR633246A (en) * | 1926-04-24 | 1928-01-25 | Siemens Schuckertwerke Gmbh | Disc-shaped coil for transformers |
| GB718748A (en) * | 1951-07-27 | 1954-11-17 | Gen Electric | Improvements in and relating to stationary electrical induction apparatus |
| GB962222A (en) * | 1959-10-29 | 1964-07-01 | English Electric Co Ltd | Improvements in or relating to inductive windings |
| CH422145A (en) * | 1961-12-15 | 1966-10-15 | Westinghouse Electric Corp | Winding for transformers or chokes |
| US3195084A (en) * | 1962-05-23 | 1965-07-13 | Westinghouse Electric Corp | Electrical apparatus having foil wound windings and metallic duct formers |
| US3464043A (en) * | 1967-10-16 | 1969-08-26 | Allis Chalmers Mfg Co | Conductor strip transformer winding having improved short circuit strength |
| GB1242401A (en) * | 1967-11-07 | 1971-08-11 | Bruce Peebles Ind Ltd | Transformer or reactor winding |
| FR2369668A1 (en) * | 1976-10-29 | 1978-05-26 | Bbc Brown Boveri & Cie | Insulator for conductors of coil for coreless induction furnace - with strip between and following curvature of conductors |
| FR2410345A1 (en) * | 1977-11-28 | 1979-06-22 | Siemens Ag | PROCESS FOR MOUNTING A MAGNETIC SUPPRACONDUCTOR WINDING |
| DE2947801A1 (en) * | 1978-12-08 | 1980-06-19 | Asea Ab | Transformer or choke coil with strip winding - uses metal foil, firmly connected to each polymer film of strip, all turns of strip coil interconnected by respective polymer films |
Also Published As
| Publication number | Publication date |
|---|---|
| SE8003782L (en) | 1981-11-22 |
| DE3165362D1 (en) | 1984-09-13 |
| EP0040382A1 (en) | 1981-11-25 |
| DK220181A (en) | 1981-11-22 |
| NO811694L (en) | 1981-11-23 |
| JPS5717117A (en) | 1982-01-28 |
| ZA813337B (en) | 1982-06-30 |
| CA1157115A (en) | 1983-11-15 |
| SE421570B (en) | 1982-01-04 |
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