EP0166951A1 - Transformer with a high-current bushing assembly - Google Patents

Transformer with a high-current bushing assembly Download PDF

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Publication number
EP0166951A1
EP0166951A1 EP85106455A EP85106455A EP0166951A1 EP 0166951 A1 EP0166951 A1 EP 0166951A1 EP 85106455 A EP85106455 A EP 85106455A EP 85106455 A EP85106455 A EP 85106455A EP 0166951 A1 EP0166951 A1 EP 0166951A1
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EP
European Patent Office
Prior art keywords
current
winding
windings
bushings
phase
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Granted
Application number
EP85106455A
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German (de)
French (fr)
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EP0166951B1 (en
Inventor
Günther Bonni
Donald Dr. Dipl.-Ing. Brandes
Willi Dipl.-Ing. Dimmler
Helmut Dipl.-Ing. Feyertag
Heinrich Groher
Leo Janner
August Kömp
Walter Dr. Dipl.-Ing. Müller
Alfred Dipl.-Ing. Süppel
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Transformatoren Union AG
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Transformatoren Union AG
Siemens AG
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Priority to AT85106455T priority Critical patent/ATE29334T1/en
Publication of EP0166951A1 publication Critical patent/EP0166951A1/en
Application granted granted Critical
Publication of EP0166951B1 publication Critical patent/EP0166951B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers
    • 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
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • 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
    • H01F27/2823—Wires
    • H01F27/2828—Construction of conductive connections, of leads

Definitions

  • the invention relates to a transformer with a high-current bushing arrangement for three-phase three-phase current and with core legs and windings arranged spatially in a row.
  • furnaces In the chemical and metallurgical industries, electrically heated furnaces are used for a wide variety of purposes and operate at relatively low operating voltages with very high currents. Since the transmission of the high currents required for these furnaces over longer distances is technically difficult and also uneconomical, transformers are usually set up in the immediate vicinity of the furnaces, in which electrical energy fed in with high voltage is brought to the desired voltage level.
  • CH-PS 409 130 discloses a transformer unit with a high-current winding in which undervoltage windings, each consisting of a single turn, are connected in series with a main and an additional transformer. Together, these two undervoltage windings have the shape of an eight.
  • the invention is therefore based on the object for a three D hare transformer, a high current bushing arrangement to provide, in an approximately uniform distribution of the current is guaranteed regardless of a triangulation on the conductor cross-sections and which can be connected without any special transition sections with non-triangulated leads of consumers.
  • This object is achieved in that two high-current feedthroughs are provided per phase and that all six high-current feedthroughs are evenly distributed over a circle, the two high-current feedthroughs assigned to the middle leg lying opposite one another on the circle and in the circle encompassed by the high-current feedthroughs generate an alternating field instead of a rotating field.
  • the high-current bushings are mounted in a single plate made of electrically conductive material carried by a boiler wall.
  • the high-current bushing arrangement according to the invention is advantageously simple and economical to produce even for very high currents and can also be used in existing systems with non-triangulated conductors.
  • Core legs 8 of a three-leg iron core of a main transformer are concentrically comprised from the inside to the outside by a step winding 4, a high-voltage winding 3 and a low-voltage winding 1.
  • a three-leg iron core with core legs 9 is also provided for an additional transformer, each of which carries an overvoltage winding 5 and an undervoltage winding 2 concentrically from the inside to the outside.
  • the main and additional transforms gate are placed close together in a common, usually filled with a cooling and insulating liquid, boiler 10 with a lid 11.
  • the high-voltage winding 3 is connected to a high-voltage supply network via high-voltage bushings (not shown) and induces a voltage in the undervoltage winding 1 coupled to it via the iron core of the main transformer and in the step winding 4.
  • the step winding 4 feeds with a step switch 6 and a turner 7 according to size and Direction of adjustable voltage, the high-voltage winding 5 of the additional transformer.
  • the high-voltage winding 5 in turn induces a voltage in the undervoltage winding 2, which as a result of a series connection of the two undervoltage windings 1 and 2 is vectorially added or subtracted to the voltage induced by the high-voltage winding 3 in the undervoltage winding 1.
  • the undervoltage winding 1 and the undervoltage winding 2 are constructed from an equal number of electrically parallel winding sections made of stranded conductors as winding conductors and each have three turns in the exemplary embodiment shown.
  • Each of the winding conductors forms a single-layer winding section in each of the two undervoltage windings 1 and 2.
  • winding sections of the undervoltage windings 1 and 2 assigned to the same phase are each connected in series, with the connecting conductor 17 constituting winding conductor pieces crossing between the undervoltage windings 1 and 2, so that the undervoltage windings 1 and 2 have opposite winding directions.
  • the shape of an eight with three windings in each of the two winding sections results for their cross section at right angles to the winding axes.
  • the two winding sections each connected in series from the undervoltage windings 1 and 2 are wound in one go to avoid soldering points.
  • a sufficiently long winding piece for the last half turn and a rejection of the winding section to be wound last is fixed on the winding core used first.
  • the winding section to be wound first in the exemplary embodiment shown three windings of one strand for the undervoltage winding 1, is finished wound on this winding core.
  • the winding core is now shifted on the winding bench approximately at right angles to the winding conductor strand running up by the center distance of the undervoltage windings 1 and 2 transversely to the winding axis, and a second winding core is attached to the winding axis on the winding bench.
  • the second winding core protrudes from the first in the axial direction, so that the second winding section, in the illustrated embodiment two and a half turns of the undervoltage winding 2, can be wound slightly axially offset without interrupting the winding conductor strand.
  • the winding conductor is cut off and the end is bent and fixed to lead out. Now the winding conductor piece lying in front of the beginning of the first winding section is moved from the first one used winding core loosened, placed around the second winding core to form a half turn and also fixed after bending the second rejection at the end of this winding section.
  • the two winding sections which are wound in this way from a single piece, form a self-supporting component that can be handled as an independent element until later installation in the transformer arrangement.
  • any number of these independent elements can therefore be stacked axially one above the other without difficulty.
  • the number of parallel branches is therefore arbitrary, so that the undervoltage windings 1 and 2 can be adapted to practically any winding current.
  • a first circuit board 12 with high-current bushings 13 and a phase with a second circuit board 12 is connected either to a star point 19 (FIG. 3) or to the first circuit board 12 of the following phase to form an electrical delta circuit (FIG. 2) .
  • two, in total six, high-current bushings 13 are provided per phase, which are supported by a plate 14 distributed uniformly over the circumference of a circle. Due to the opposing arrangement of the two high current bushings 13 assigned to the middle core legs 8 and 9, these are not arranged cyclically, so that in the space between the high current bushings 13 instead of a rotating field there is an alternating field.
  • radial cooling channels 15 are provided between the individual windings, but at least between axially adjacent winding sections.
  • the high-voltage windings 3 and 5 are made shorter in the axial direction than the respectively associated undervoltage windings 1 and 2 by axially different distribution of the current to the parallel branches.
  • the winding arrangements of the individual phases each have a pressboard jacket 20 that completely surrounds them, which is supported by spacer bars 21 on the circumference of one of the undervoltage windings 1 or 2.
  • These press clamping sleeves 20 serve to guide the cooling liquid by forcing them to flow through the windings even when driven by a circulating pump.
  • the heat dissipation from the windings is increased, so that, compared to arrangements with a cooling circuit driven purely thermally by convection, higher powers can be implemented with the same winding volume.

Abstract

1. A transformer with a high current bushing arrangement for three-phase rotary current, comprising in a spatial series arrangement core flanks (8, 9) and windings (1, 2, 3, 4, 5) characterised in that two high current bushings (13) are provided for each phase and that all six high current bushings (13) are uniformly distributed over a circle, where the two high current bushings (13) of at least one phase are arranged opposite one another on the circle so that an alternating field instead of a rotary field prevails in the circle defined by the high current bushings (13).

Description

Die Erfindung betrifft einen Transformator mit einer Hochstromdurchführungsanordnung für Dreiphasendrehstrom und mit räumlich in einer Reihe angeordneten Kernschenkeln und Wicklungen.The invention relates to a transformer with a high-current bushing arrangement for three-phase three-phase current and with core legs and windings arranged spatially in a row.

In der chemischen und in der metallurgischen Industrie werden für die verschiedensten Zwecke elektrisch beheizte Öfen eingesetzt, die bei verhältnismäßig geringen Betriebsspannungen mit sehr hohen Stromstärken arbeiten. Da die Übertragung der für diese Öfen erforderlichen hohen Stromstärken Uber größere Entfernungen technisch schwierig und darüber hinaus auch unwirtschaftlich ist, werden üblicherweise in unmittelbarer Nachbarschaft der Öfen Transformatoren aufgestellt, in denen mit Hochspannung eingespeiste elektrische Energie auf das gewünschte Spannungsniveau gebracht wird.In the chemical and metallurgical industries, electrically heated furnaces are used for a wide variety of purposes and operate at relatively low operating voltages with very high currents. Since the transmission of the high currents required for these furnaces over longer distances is technically difficult and also uneconomical, transformers are usually set up in the immediate vicinity of the furnaces, in which electrical energy fed in with high voltage is brought to the desired voltage level.

Durch die CH-PS 409 130 ist hierzu ein Transformatoraggregat mit einer Hochstromwicklung bekannt, bei der aus je einer einzigen Windung bestehende Unterspannungswicklungen je eines Haupt- und eines Zusatztransformators in Reihe geschaltet sind. Diese beiden Unterspannungswicklungen haben zusammen die Form einer Acht.CH-PS 409 130 discloses a transformer unit with a high-current winding in which undervoltage windings, each consisting of a single turn, are connected in series with a main and an additional transformer. Together, these two undervoltage windings have the shape of an eight.

Bei derartigen Trafos ergeben sich infolge der großen Stromstärke große erforderliche Leiterquerschnitte, die infolge der von den Strömen selbst erzeugten Magnetfelder nicht gleichmäßig mit Strom belegt sind. Um den Einfluß dieser Magnetfelder auf die Stromverteilung über die Leiterouerschnitte zu mindern oder auszuschließen, werden, wie in den deutschen Patentanmeldungen P 32 42 438.8 und P 34 11 141.7 vorgeschlagen worden ist, triangulierte Leiterführungen eingesetzt. In diesen triangulierten Leiterführungen kompensieren sich die Wirkungen der Magnetfelder der Einzelleiter. Entsprechend triangulierte Durchführungsanordnungen in Hochstromtransformatoren setzen Draktisch jedoch voraus, daß auch die zum Verbraucher, beispielsweise dem Elektrostahlofen, führende Leitung trianguliert ist. Ist dies nicht der Fall, so ergibt sich für die Übergangsstelle unerwünschterweise ein zusätzlicher Raumbedarf.In the case of such transformers, the large current strength results in large conductor cross sections which are not evenly supplied with current due to the magnetic fields generated by the currents themselves. To see the influence of these magnetic fields on the current distribution To reduce or exclude the conductor cross-sections, triangulated conductor guides are used, as has been proposed in German patent applications P 32 42 438.8 and P 34 11 141.7. The effects of the magnetic fields of the individual conductors are compensated for in these triangulated conductor guides. Correspondingly triangulated lead-through arrangements in high-current transformers, however, require D that the line leading to the consumer, for example the electric steel furnace, is also triangulated. If this is not the case, the transition point undesirably requires additional space.

Der Erfindung liegt daher die Aufgabe zugrunde, für einen DreiDhasentransformator eine Hochstromdurchführungsanordnung zu schaffen, in der eine annähernd gleichmäßige Verteilung des Stromes auf die Leiterquerschnitte unabhängig von einer Triangulierung gewährleistet ist und die ohne besondere Ubergangsabschnitte mit nicht triangulierten Zuleitungen von Verbrauchern verbindbar ist.The invention is therefore based on the object for a three D hare transformer, a high current bushing arrangement to provide, in an approximately uniform distribution of the current is guaranteed regardless of a triangulation on the conductor cross-sections and which can be connected without any special transition sections with non-triangulated leads of consumers.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß je Phase zwei Hochstromdurchführungen vorgesehen sind und daß alle sechs Hochstromdurchführungen gleichmäßig auf einen Kreis verteilt sind, wobei die beiden der am Mittelschenkel liegenden Phase zugeordneten Hochstromdurchführungen sich auf dem Kreis einander gegenüberliegen und in dem von den Hochstromdurchführungen umfaßten Kreis ein Wechselfeld anstelle eines Drehfeldes erzeugen.This object is achieved in that two high-current feedthroughs are provided per phase and that all six high-current feedthroughs are evenly distributed over a circle, the two high-current feedthroughs assigned to the middle leg lying opposite one another on the circle and in the circle encompassed by the high-current feedthroughs generate an alternating field instead of a rotating field.

Nach einer zweckmäßigen Weiterbildung der Erfindung ist vorgesehen, daß die Hochstromdurchführungen in einer einzigen von einer Kesselwand getragenen Platte aus elektrisch leitfähigem Werkstoff gelagert sind.According to an expedient development of the invention, it is provided that the high-current bushings are mounted in a single plate made of electrically conductive material carried by a boiler wall.

Die erfindungsgemäße HochstromdurchfUhrungsanordnung ist vorteilhafterweise einfach und wirtschaftlich auch für sehr hohe Stromstärken herstellbar und ist darüber hinaus auch in bestehenden Anlagen mit nicht triangulierten Leitern einsetzbar.The high-current bushing arrangement according to the invention is advantageously simple and economical to produce even for very high currents and can also be used in existing systems with non-triangulated conductors.

Ein AusfUhrungsbeispiel nach der Erfindung wird anhand einer Zeichnung näher erläutert. Im einzelnen zeigen:

  • Fig. 1 das Schaltbild eines Hochstromtransformators mit indirekter Spannungseinstellung über einen Zwischenkreis,
  • Fig. 2 die Draufsicht auf ein Hochstromtransformatoraggregat mit elektrisch im Dreieck geschalteten Unterspannungswicklungen bei abgenommenem Kesseldeckel und abgenommenen oberen Jochen,
  • Fig. 3 die Draufsicht auf ein Hochstromtransformatoraggregat mit elektrisch im Stern geschalteten Unterspannungswicklungen bei abgenommenem Kesseldeckel und abgenommenen oberen Jochen und
  • Fig. 4 die Ansicht eines Hochstromtransformators auf die die Hochstromdurchführungen tragende Seite.
An exemplary embodiment according to the invention is explained in more detail with reference to a drawing. In detail show:
  • 1 shows the circuit diagram of a high-current transformer with indirect voltage setting via an intermediate circuit,
  • 2 is a top view of a high-current transformer unit with undervoltage windings electrically connected in a triangle with the boiler cover removed and the upper yokes removed,
  • Fig. 3 is a plan view of a high-current transformer unit with low-voltage windings electrically connected in a star with the boiler lid and upper yokes and removed
  • Fig. 4 is a view of a high current transformer on the side carrying the high current bushings.

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

Kernschenkel 8 eines dreischenkligen Eisenkernes eines Haupttransformators sind konzentrisch von innen nach außen von je einer Stufenwicklung 4, je einer Oberspannungswicklung 3 und je einer Unterspannungswicklung 1 umfaßt. Räumlich parallel zu dem Eisenkern des Haupttransformators ist für einen Zusatztransformator ein ebenfalls dreischenkliger Eisenkern mit Kernschenkeln 9 vorgesehen, die konzentrisch von innen nach außen je eine Oberspannungswicklung 5 und je eine Unterspannungswicklung 2 tragen. Der Haupt- und der Zusatztransformator sind dicht nebeneinanderstehend in einem gemeinsamen, üblicherweise mit einer Kühl- und Isolierflüssigkeit gefüllten, Kessel 10 mit einem Deckel 11 aufgestellt.Core legs 8 of a three-leg iron core of a main transformer are concentrically comprised from the inside to the outside by a step winding 4, a high-voltage winding 3 and a low-voltage winding 1. Spatially parallel to the iron core of the main transformer, a three-leg iron core with core legs 9 is also provided for an additional transformer, each of which carries an overvoltage winding 5 and an undervoltage winding 2 concentrically from the inside to the outside. The main and additional transforms gate are placed close together in a common, usually filled with a cooling and insulating liquid, boiler 10 with a lid 11.

Die Oberspannungswicklung 3 liegt über nicht dargestellte Hochspannungsdurchführungen an einem Hochspannungsversorgungsnetz und induziert eine Spannung in der mit ihr über den Eisenkern des Haupttransformators gekoppelte Unterspannungswicklung 1 sowie in der Stufenwicklung 4. Die Stufenwicklung 4 speist mit einer über einen Stufenschalter 6 und einen Wender 7 nach Größe und Richtung einstellbaren Spannung die Oberspannungswicklung 5 des Zusatztransformators. Die Oberspannungswicklung 5 ihrerseits induziert in der Unterspannungswicklung 2 eine Spannung, die infolge einer Reihenschaltung der beiden Unterspannungswicklungen 1 und 2 zu der von der Oberspannungswicklung 3 in der Unterspannungswicklung 1 induzierten Spannung vektoriell addiert oder subtrahiert wird.The high-voltage winding 3 is connected to a high-voltage supply network via high-voltage bushings (not shown) and induces a voltage in the undervoltage winding 1 coupled to it via the iron core of the main transformer and in the step winding 4. The step winding 4 feeds with a step switch 6 and a turner 7 according to size and Direction of adjustable voltage, the high-voltage winding 5 of the additional transformer. The high-voltage winding 5 in turn induces a voltage in the undervoltage winding 2, which as a result of a series connection of the two undervoltage windings 1 and 2 is vectorially added or subtracted to the voltage induced by the high-voltage winding 3 in the undervoltage winding 1.

Die Unterspannungswicklung 1 und die Unterspannungswicklung 2 sind aus einer gleich großen Anzahl von elektrisch parallelgeschalteten Wicklungsabschnitten aus Drilleitern als Wickelleiter aufgebaut und haben im dargestellten Ausführungsbeispiel je drei Windungen. Jeder der Wickelleiter bildet in jeder der beiden Unterspannungswicklungen 1 und 2 je einen einlagig ausgeführten Wicklungsabschnitt. In gleicher axialer Höhe liegende Wicklungsabschnitte der derselben Phase zugeordneten Unterspannungswicklungen 1 und 2 sind jeweils in Reihe geschaltet, wobei die Verbindungsleiter 17 darstellende Wickelleiterstücke sich zwischen den Unterspannungswicklungen 1 und 2 kreuzen, so daß die Unterspannungswicklungen 1 und 2 einander entgegengesetzten Wickelsinn aufweisen.The undervoltage winding 1 and the undervoltage winding 2 are constructed from an equal number of electrically parallel winding sections made of stranded conductors as winding conductors and each have three turns in the exemplary embodiment shown. Each of the winding conductors forms a single-layer winding section in each of the two undervoltage windings 1 and 2. At the same axial height, winding sections of the undervoltage windings 1 and 2 assigned to the same phase are each connected in series, with the connecting conductor 17 constituting winding conductor pieces crossing between the undervoltage windings 1 and 2, so that the undervoltage windings 1 and 2 have opposite winding directions.

Aus der beschriebenen Anordnung der Unterspannungswicklungen 1 und 2 ergibt sich für deren Querschnitt rechtwinklig zu den Wickelachsen die Form einer Acht mit je drei Windungen in jedem der beiden Wicklungsabschnitte. Die beiden jeweils in Reihe geschalteten Wicklungsabschnitte aus den Unterspannungswicklungen 1 und 2 sind zur Vermeidung von Lötstellen in einem Zug gewickelt. Hierzu ist zunächst vor dem Anfang des zuerst zu wickelnden Wicklungsabschnittes ein ausreichend langes Wickelstück für die letzte halbe Windung und eine Ausleitung des zuletzt zu wickelnden Wicklungsabschnittes auf dem zuerst benutzten Wickelkern fixiert. Danach wird auf diesen Wickelkern der zuerst zu wickelnde Wicklungsabschnitt, beim dargestellten Ausführungsbeispiel drei Windungen eines Stranges für die Unterspannungswicklung 1, fertiggewickelt.From the arrangement of the undervoltage windings 1 and 2 described, the shape of an eight with three windings in each of the two winding sections results for their cross section at right angles to the winding axes. The two winding sections each connected in series from the undervoltage windings 1 and 2 are wound in one go to avoid soldering points. For this purpose, before the start of the winding section to be wound first, a sufficiently long winding piece for the last half turn and a rejection of the winding section to be wound last is fixed on the winding core used first. Then the winding section to be wound first, in the exemplary embodiment shown three windings of one strand for the undervoltage winding 1, is finished wound on this winding core.

Der Wickelkern wird nun auf der Wickelbank etwa rechtwinklig zum auflaufenden Wickelleiterstrang um den Achsabstand der Unterspannungswicklungen 1 und 2 quer zur Wickelachse verschoben und ein zweiter Wickelkern wird zentrisch zur Wickelachse der Wickelbank auf dieser befestigt. Der zweite Wickelkern steht gegenüber dem ersten in Achsrichtung vor, so daß geringfügig axial versetzt, ohne Unterbrechung des Wickelleiterstranges der zweite Wicklungsabschnitt, beim dargestellten Ausführungsbeispiel zweieinhalb Windungen der Unterspannungswicklung 2, wickelbar ist.The winding core is now shifted on the winding bench approximately at right angles to the winding conductor strand running up by the center distance of the undervoltage windings 1 and 2 transversely to the winding axis, and a second winding core is attached to the winding axis on the winding bench. The second winding core protrudes from the first in the axial direction, so that the second winding section, in the illustrated embodiment two and a half turns of the undervoltage winding 2, can be wound slightly axially offset without interrupting the winding conductor strand.

Nach Aufhebung des geringfügigen axialen Versatzes unter Aufrechterhaltung des Wickelzuges in dem Verbindungsleiter 17 zwischen den beiden Wicklungsabschnitten wird der Wickelleiter abgeschnitten und das Ende zu einer Ausleitung abgebogen und fixiert. Nunmehr wird das vor dem Anfang des zuerst gewickelten Wicklungsabschnittes liegende Wickelleiterstück von dem zuerst benutzten Wickelkern gelöst, unter Bildung einer halben Windung um den zweiten Wickelkern gelegt und nach dem Biegen der zweiten Ausleitung am Ende dieses Wicklungsabschnittes ebenfalls fixiert.After the slight axial offset has been eliminated while maintaining the winding tension in the connecting conductor 17 between the two winding sections, the winding conductor is cut off and the end is bent and fixed to lead out. Now the winding conductor piece lying in front of the beginning of the first winding section is moved from the first one used winding core loosened, placed around the second winding core to form a half turn and also fixed after bending the second rejection at the end of this winding section.

Die beiden so aus einem Stück gewickelten in Reihe geschalteten Wicklungsabschnitte bilden ein selbsttragendes Bauteil, das bis zum später erfolgenden Einbau in die Transformatoranordnung als selbständiges Element handhabbar ist. Beim Einbau in die Wicklungsanordnung können daher ohne Schwierigkeiten beliebig viele dieser selbständigen Elemente axial übereinander gestapelt werden. Die Zahl der Parallelzweige ist daher beliebig wählbar, so daß die Unterspannungswicklungen 1 und 2 an praktisch jeden Wicklungsstrom anpaßbar sind.The two winding sections, which are wound in this way from a single piece, form a self-supporting component that can be handled as an independent element until later installation in the transformer arrangement. When installed in the winding arrangement, any number of these independent elements can therefore be stacked axially one above the other without difficulty. The number of parallel branches is therefore arbitrary, so that the undervoltage windings 1 and 2 can be adapted to practically any winding current.

Die Parallelschaltung dieser die Wicklungsabschnitte darstellenden Elemente erfolgt über massive Leiterplatten 12, die Nuten zum Einlöten der freien Enden der Ausleitungen aufweisen und die gleichzeitig zum Verschalten der drei Phasen der Unterspannungswicklungen 1 und 2 dienen. Hierzu ist beispielsweise je Phase je eine erste Leiterplatte 12 mit Hochstromdurchführungen 13 und je Phase je eine zweite Leiterplatte 12 entweder mit einem Sternpunkt 19 (Fig. 3) oder mit der ersten Leiterplatte 12 der folgenden Phase zu einer elektrischen Dreiecksschaltung (Fig. 2) verbunden.These elements representing the winding sections are connected in parallel via solid printed circuit boards 12 which have grooves for soldering in the free ends of the leads and which at the same time serve to connect the three phases of the undervoltage windings 1 and 2. For this purpose, for example, a first circuit board 12 with high-current bushings 13 and a phase with a second circuit board 12 is connected either to a star point 19 (FIG. 3) or to the first circuit board 12 of the following phase to form an electrical delta circuit (FIG. 2) .

Je Phase sind beim Ausführungsbeispiel zwei, insgesamt also sechs, Hochstromdurchführungen 13 vorgesehen, die gleichmäßig auf den Umfang eines Kreises verteilt von einer Platte 14 getragen sind. Durch sich gegenüberliegende Anordnung der beiden den mittleren Kernschenkeln 8 und 9 zugeordneten Hochstromdurchführungen 13 sind diese nicht zyklisch angeordnet, so daß im Raum zwischen den Hochstromdurchführungen 13 anstelle eines Drehfeldes ein Wechselfeld herrscht.In the exemplary embodiment, two, in total six, high-current bushings 13 are provided per phase, which are supported by a plate 14 distributed uniformly over the circumference of a circle. Due to the opposing arrangement of the two high current bushings 13 assigned to the middle core legs 8 and 9, these are not arranged cyclically, so that in the space between the high current bushings 13 instead of a rotating field there is an alternating field.

Da die Unterspannungswicklungen 1 und 2 thermisch hoch beansprucht sind, sind zwischen den einzelnen Windungen, mindestens aber zwischen axial benachbarten Wicklungsabschnitten, radiale Kühlkanäle 15 vorgesehen. Zusätzlich sind zur Vermeidung von Überlastungen der räumlich an den Enden der Unterspannungswicklungen 1 und 2 liegenden Wicklungsabschnitte durch axial unterschiedliche Verteilung des Stromes auf die Parallelzweige die Oberspannungswicklungen 3 und 5 in Achsrichtung kürzer als die jeweils zugehörige Unterspannungswicklung 1 bzw. 2 ausgeführt.Since the undervoltage windings 1 and 2 are subjected to high thermal stresses, radial cooling channels 15 are provided between the individual windings, but at least between axially adjacent winding sections. In addition, in order to avoid overloading the winding sections located spatially at the ends of the undervoltage windings 1 and 2, the high-voltage windings 3 and 5 are made shorter in the axial direction than the respectively associated undervoltage windings 1 and 2 by axially different distribution of the current to the parallel branches.

Zur weiteren Erhöhung der thermischen Belastbarkeit tragen die Wicklungsanordnungen der einzelnen Phasen je einen sie vollständig umfassenden Preßspanmantel 20, der sich über Distanzleisten 21 auf dem Umfang je einer der Unterspannungswicklungen 1 oder 2 abstützt. Diese Preßspanmäntel 20 dienen der Führung der Kühlflüssigkeit, indem sie diese auch beim Antrieb durch eine Umwälzpumpe zwingen durch die Wicklungen zu strömen. Infolge einer hierdurch erzwungenen höheren Strömungsgeschwindigkeit der Kühlflüssigkeit in den Wicklungen wird die Wärmeabfuhr aus diesen erhöht, so daß gegenüber Anordnungen mit rein thermisch durch Konvektion angetriebenen Kühlkreislauf höhere Leistungen bei gleichen Wicklungsvolumen umsetzbar sind.To further increase the thermal load capacity, the winding arrangements of the individual phases each have a pressboard jacket 20 that completely surrounds them, which is supported by spacer bars 21 on the circumference of one of the undervoltage windings 1 or 2. These press clamping sleeves 20 serve to guide the cooling liquid by forcing them to flow through the windings even when driven by a circulating pump. As a result of a higher flow rate of the cooling liquid in the windings, the heat dissipation from the windings is increased, so that, compared to arrangements with a cooling circuit driven purely thermally by convection, higher powers can be implemented with the same winding volume.

Claims (4)

1. Transformator mit einer Hochstromdurchführungsanordnung für Dreiphasendrehstrom und mit räumlich in einer Reihe angeordneten Kernschenkeln (8, 9) und Wicklungen (1, 2, 3, 4, 5), dadurch gekenn- zeichnet, daß je Phase zwei Hochstromdurchführungen (13) vorgesehen sind und daß alle sechs HochstromdurchfUhrungen (13) gleichmäßig auf einem Kreis verteilt sind, wobei die beiden Hochstromdurchführungen (13) mindestens einer Phase sich auf dem Kreis einander gegenüberliegen, so daß in dem von den Hochstromdurchführungen (13) umfaßten Kreis ein Wechselfeld anstelle eines Drehfeldes vorhanden ist.1. Transformer with a high-current bushing arrangement for three-phase three-phase current and with core legs (8, 9) and windings (1, 2, 3, 4, 5) arranged spatially in a row, characterized in that two high-current bushings (13) are provided for each phase and that all six high-current bushings (13) are evenly distributed on a circle, the two high-current bushings (13) at least one phase lying opposite one another on the circle, so that an alternating field instead of a rotating field is present in the circle encompassed by the high-current bushings (13) is. 2. Transformator nach Anspruch 1, dadurch ge- kennzeichnet, daß bei im Stern geschalteten Hochstromwicklungen (1, 2) die beiden der am Mittelschenkel liegenden Phase zugeordneten Hochstromdurchführungen (13) sich auf dem Kreis gegenüberliegen.2. Transformer according to claim 1, characterized in that, in the case of high-current windings (1, 2) connected in the star, the two high-current bushings (13) assigned to the phase on the center leg are opposite one another on the circuit. 3. Transformator nach Anspruch 1, dadurch ge- kennzeichnet, daß bei im Dreieck geschalteten Hochstromwicklungen (1, 2) mit je einem Wicklungsende der auf den Außenschenkeln angeordneten Hochstromwicklungen (1, 2) verbundene Hochstromdurchführungen (13) sich auf dem Kreis gegenüberliegen.3. Transformer according to claim 1, characterized in that in the case of delta-connected high-current windings (1, 2) with one winding end of the high-current windings (1, 2) arranged on the outer legs, high-current bushings (13) connected opposite each other on the circuit. 4. Transformator nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Hochstromdurchführungen (13) in einer von einer Kesselwand (10) getragenen gemeinsamen Platte (14) aus elektrisch leitfähigem Werkstoff gelagert sind.4. Transformer according to one of claims 1 to 3, characterized in that the high current bushings (13) are mounted in a common plate (14) made of electrically conductive material carried by a boiler wall (10).
EP85106455A 1984-06-07 1985-05-24 Transformer with a high-current bushing assembly Expired EP0166951B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85106455T ATE29334T1 (en) 1984-06-07 1985-05-24 TRANSFORMER WITH A HIGH CURRENT FEEDING ARRANGEMENT.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3421222 1984-06-07
DE3421222 1984-06-07
DE19843423902 DE3423902A1 (en) 1984-06-07 1984-06-28 TRANSFORMER WITH A HIGH-CIRCUIT ARRANGEMENT
DE3423902 1984-06-28

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EP0166951A1 true EP0166951A1 (en) 1986-01-08
EP0166951B1 EP0166951B1 (en) 1987-09-02

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EP85106455A Expired EP0166951B1 (en) 1984-06-07 1985-05-24 Transformer with a high-current bushing assembly

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EP (1) EP0166951B1 (en)
BR (1) BR8502696A (en)
DE (2) DE3423902A1 (en)
NO (1) NO164868C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3629310A1 (en) * 1986-08-28 1988-03-10 Transformatoren Union Ag High-current conductor for special transformers
DE10006810A1 (en) 1999-02-23 2000-12-14 Bernd Federhen Feeding device for transferring bulk goods from reservoir to pneumatic conveyor line comprises flow control area with movable closing device fitted with ventilator which is closed by sealing component when lifting component moves upwards

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1393509A (en) * 1964-02-12 1965-03-26 Materiel Electrique S W Le High intensity sound insulating bushing for electrical device
DE1915864A1 (en) * 1969-03-28 1970-10-01 Horst Wionsek Three-phase oil transformer
DE2139663A1 (en) * 1971-08-07 1973-02-15 Schorch Gmbh ARRANGEMENT CONSISTS OF AN OPTIONAL STAR-CONNECTION AND ANOTHER CHAIN-LINKABLE THREE-PHASE TRANSFORMER DEVELOPMENT WITH AN ASSOCIATED CHANGEOVER DEVICE
EP0068158A1 (en) * 1981-06-26 1983-01-05 Westinghouse Electric Corporation Electric transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1393509A (en) * 1964-02-12 1965-03-26 Materiel Electrique S W Le High intensity sound insulating bushing for electrical device
DE1915864A1 (en) * 1969-03-28 1970-10-01 Horst Wionsek Three-phase oil transformer
DE2139663A1 (en) * 1971-08-07 1973-02-15 Schorch Gmbh ARRANGEMENT CONSISTS OF AN OPTIONAL STAR-CONNECTION AND ANOTHER CHAIN-LINKABLE THREE-PHASE TRANSFORMER DEVELOPMENT WITH AN ASSOCIATED CHANGEOVER DEVICE
EP0068158A1 (en) * 1981-06-26 1983-01-05 Westinghouse Electric Corporation Electric transformer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, Band 3, Nr. 41 (E-103), 10. April 1979, Seite 147 E103; & JP - A - 54 21530 (HITACHI SEISAKUSHO K.K.) 17.02.1979 *
PATENTS ABSTRACTS OF JAPAN, Band 7, Nr. 49 (E-161)(1194), 25. Februar 1983; & JP - A - 57 199215 (TOKYO SHIBAURA DENKI K.K.) 07.12.1982 *

Also Published As

Publication number Publication date
EP0166951B1 (en) 1987-09-02
NO164868C (en) 1990-11-21
DE3423902A1 (en) 1985-12-12
BR8502696A (en) 1986-02-12
DE3560542D1 (en) 1987-10-08
NO851747L (en) 1985-12-09
NO164868B (en) 1990-08-13

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