EP0061608A1 - Air-cooled dry type transformer or inductance - Google Patents

Air-cooled dry type transformer or inductance Download PDF

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Publication number
EP0061608A1
EP0061608A1 EP82101788A EP82101788A EP0061608A1 EP 0061608 A1 EP0061608 A1 EP 0061608A1 EP 82101788 A EP82101788 A EP 82101788A EP 82101788 A EP82101788 A EP 82101788A EP 0061608 A1 EP0061608 A1 EP 0061608A1
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EP
European Patent Office
Prior art keywords
winding
screen
core
transformer
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP82101788A
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German (de)
French (fr)
Inventor
Jacobus F.H. Van Der Vegt
Petrus F. Den Hartog
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Smit Transformatoren BV
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Smit Transformatoren BV
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Publication of EP0061608A1 publication Critical patent/EP0061608A1/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
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • 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
    • H01F27/327—Encapsulating or impregnating
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F27/327—Encapsulating or impregnating
    • H01F2027/328—Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases

Definitions

  • network transformers which have a high-voltage and a low-voltage winding.
  • the windings are usually wound from copper wire and cast in casting resin under vacuum.
  • Axially arranged air channels allow the cooling air to rise from the bottom to the top and ensure sufficient cooling of the windings of the known dry-type transformers.
  • the cooling channels between high-voltage and low-voltage windings not only have the task of transporting the cooling air, but they also have the task of isolating the windings from one another and from the core.
  • the clear width of the cooling channels is matched to the insulation task; it would easily be possible to dimension the cooling ducts narrower if only air cooling had to be taken into account.
  • the screen When designing and installing the screen, care must be taken to ensure that the screen does not form a winding in itself, but has an interruption in conductivity over its entire height. This can be done, for example, through a narrow slot that extends from top to bottom.
  • the screen is preferably designed such that it has overlapping, mutually insulated side edges in the region of the interruption.
  • FIG. 1 shows a phase section 1 of a dry transformer in a partially sectioned side view, the outer dimensions of which are essentially the same as those of the applicant's known network transformers.
  • the phase part 1 is provided with pulled out connections 2, 3, in which the connection electrodes 4 are protected.
  • the electrodes 4 are electrically connected to the high-voltage winding 5 consisting of individual sections High-voltage winding 5 arranged around the core 6 and embedded in a solidified casting compound 7.
  • an undervoltage winding 8 is also provided around the core 6, which is also cast into a corresponding casting compound 9 in a manner known per se.
  • cooling channels 10 and 11 run axially and circumferentially around the core, namely between the upper and lower voltage winding and between undervoltage winding 8 and core 6. This configuration essentially corresponds to the prior art.
  • an electrically conductive, non-magnetic shield 14 is arranged in the inner jacket of the high-voltage winding of the phase part 1, but a narrow gap (gap 23) is provided in the shield, which extends from top to bottom, so that there is a conductivity interruption extending over the entire height (see FIG. 3).
  • the screen 14 lies firmly against the inside of the casting compound 7, which forms a cylindrical hollow jacket around the high-voltage winding assigned to it.
  • the screen is made from a fine metal wire mesh, this mesh is cast onto the casting compound or cast into it.
  • the metal mesh for example, consists of a fine copper wire with a mesh size of 1 - 2 mm mesh size.
  • the mesh size is not critical, but is primarily determined by predetermined, commercially available materials. Its upper limit is the electrical potential penetration, as is known per se to the person skilled in the art with such shields.
  • FIG. 3 shows an umbrella 14 in isolation. It can be seen that the umbrella 14 is an approximately cylindrical structure with open base sides. The sheath is formed by a fine metal wire mesh. In the exemplary embodiment according to FIG. 3, the jacket edges 20, 21 lie somewhat apart (not overlapping), so that a narrow gap 23 is formed. It can also be seen from FIG. 3 that a potential ring 24, 25 forms the upper and lower end of the screen 4, which is soldered to the fabric material. This potential ring, the contour of which can also be seen in FIG. 2, ensures that the stepping potential at the foot and at the end of the winding is kept as small as possible. For example, it consists of 2 - 3 mm thick round copper wire.
  • the screens 14, 15, 16 are firmly connected on one side to the casting compound, so that no cavities can form on this side which could impair the effect.
  • the built-in screens allow the clear width of the air ducts to be significantly reduced, in some cases up to half, compared to transformers with the same voltage.

Abstract

Air-cooled dry-type transformers or air-cooled inductances with at least one winding, arranged about the core and cast in a solidified cast mass, and axially running cooling channels between the windings and/or the winding and the core, in which at least one earthed, electrically conductive, non-magnetic screen (14), extending above the height of the winding, is arranged between at least in each case two windings and/or between the winding next to the core and the core, circumferentially surrounding, or virtually surrounding, the core. On at least one side, the screen is fastened to a compact cast-mass sleeve, allocated to a winding and bounding an air channel, or is cast into the cast mass, at least the inner side (air channel side) of the high-tension winding, if fitted, being provided with a screen (14). The screen (14) consists preferably of a cylindrically bent metal-wire gauze. <IMAGE>

Description

Die Erfindung betrifft einen luftgekühlten Trockentransformator oder eine luftgekühlte Drosselspule mit wenigstens einer um den Kern angeordneten, in eine erstarrte Vergußmasse eingegossenen Wicklung und axial verlaufenden Kühlkanälen zwischen den Wicklungen und/oder Wicklung und Kern.The invention relates to an air-cooled dry transformer or an air-cooled choke coil with at least one winding arranged around the core, cast into a solidified casting compound, and axially extending cooling channels between the windings and / or winding and core.

Aus der Firmendruckschrift der Anmelderin "Resitra Netztransformatoren", Druckwerk 78 TFE-2D, sind Netztransformatoren bekannt, die eine Hochspannungs- und eine Niederspannungswicklung aufweisen. üblicherweise sind die Wicklungen aus Kupferdraht gewickelt und unter Vakuum in Gießharz eingegossen. Axial angeordnete Luftkanäle lassen die Kühlluft von unten nach oben steigen und sorgen für eine ausreichende Kühlung der Wicklungen der bekannten Trockentransformatoren.From the company publication of the applicant "Resitra Netztransformatoren", printing unit 78 TFE-2D, network transformers are known which have a high-voltage and a low-voltage winding. The windings are usually wound from copper wire and cast in casting resin under vacuum. Axially arranged air channels allow the cooling air to rise from the bottom to the top and ensure sufficient cooling of the windings of the known dry-type transformers.

Die Kühlkanäle zwischen Oberspannungs- und Unterspannungswicklung haben bei den Transformatoren gemäß Stand der Technik nicht nur die Aufgabe, die Kühlluft zu transportieren, sondern sie haben auch die Aufgabe, die Wicklungen gegeneinander und gegenüber dem Kern zu isolieren. Die lichte Weite der Kühlkanäle ist dabei abgestimmt auf die Isolationsaufgabe; es wäre ohne weiteres möglich, die Kühlkanäle enger zu dimensionieren, wenn nur die Luftkühlung berücksichtigt werden müßte. Es sei als Beispiel genannt: Bei einer Betriebsspannung der Oberspannungswicklung von 30 kV ist eine lichte Weite von ungefähr 25 mm erforderlich, während allein für die Luftkühlungsaufgabe eine lichte Weite von etwa 10 mm ausreichend wäre. Dieses Zahlenbeispiel soll aber nicht einschränkend verstanden sein.In the case of the transformers according to the prior art, the cooling channels between high-voltage and low-voltage windings not only have the task of transporting the cooling air, but they also have the task of isolating the windings from one another and from the core. The clear width of the cooling channels is matched to the insulation task; it would easily be possible to dimension the cooling ducts narrower if only air cooling had to be taken into account. Let me give you an example: At a company voltage of the high-voltage winding of 30 kV, a clear width of approximately 25 mm is required, whereas a clear width of approximately 10 mm would be sufficient for the air cooling task alone. However, this numerical example should not be understood as restrictive.

Es stellt sich demnach die Aufgabe, die bekannten Trockentransformatoren und entsprechend gebaute luftgekühlte Drosselspulen so zu bauen, daß bei gleichen äußeren Abmessungen eine höhere Betriebsspannung angelegt werden kann bzw. daß bei gleichen Betriebsspannungen kleinere äußere Abmessungen möglich sind.It is therefore the task of building the known dry-type transformers and appropriately built air-cooled choke coils so that a higher operating voltage can be applied with the same external dimensions or that smaller external dimensions are possible with the same operating voltages.

Diese technische Aufgabe wird gelöst bei Trockentransformatoren oder Drosselspulen der eingangs genannten Art, die folgende Merkmale aufweisen:

  • - Wenigstens ein geerdeter, elektrisch leitfähiger, unmagnetischer Schirm ist zwischen wenigstens je zwei Wicklungen und /oder zwischen der kernächsten Wicklung und Kern, den Kern zirkumferential umfassend oder fast umfassend, über die Wicklungshöhe reichend, angeordnet,
  • - der Schirm liegt wenigstens einseitig an einem kompakten, einer Wicklung zugeordneten und an einen Luftkanal grenzenden, richtig dimensionierten, Gußmassen-Mantel fest an oder ist dort in die Vergußmasse eingegossen,
  • - wenn vorhanden, ist wenigstens die Innenseite (Luftkanalseite) der Oberspannungswicklung mit einem Schirm versehen..
This technical problem is solved with dry-type transformers or choke coils of the type mentioned at the outset, which have the following features:
  • At least one grounded, electrically conductive, non-magnetic shield is arranged between at least two windings and / or between the winding closest to the core and the core, the core being circumferential or almost comprehensive, reaching over the winding height,
  • the screen lies at least on one side against a compact, correctly dimensioned casting compound jacket which is assigned to a winding and adjoins an air duct, or is cast there in the casting compound,
  • - If available, at least the inside (air duct side) of the high-voltage winding is provided with a screen.

Durch den geerdeten Schirm wird verhindert, daß eine sehr hohe Spannung über dem Luftspalt steht. Die Spannung wird vielmehr erniedrigt, so daß der Luftspalt nicht mehr maßgebend als Isolationsstrecke dienen muß. Insgesamt werden damit die vorstehend genannten Aufgaben erfüllbar.The grounded shield prevents a very high voltage from being present across the air gap. Rather, the voltage is reduced, so that the air gap no longer has to serve decisively as an insulation section. Overall, the above-mentioned tasks can thus be fulfilled.

Bei der Konstruktion und dem Einbau des Schirmes muß darauf geachtet werden, daß der Schirm in sich keine Wicklung bildet, sondern auf seiner ganzen Höhe eine Leitfähigkeitsunterbrechung aufweist. Das kann beispielsweise geschehen durch einen schmalen, von oben nach unten reichenden Schlitz. Vorzugsweise wird jedoch der Schirm so ausgeführt, daß er im Bereiche der Unterbrechung sich überlappende, voneinander isolierte Seitenkanten aufweist.When designing and installing the screen, care must be taken to ensure that the screen does not form a winding in itself, but has an interruption in conductivity over its entire height. This can be done, for example, through a narrow slot that extends from top to bottom. However, the screen is preferably designed such that it has overlapping, mutually insulated side edges in the region of the interruption.

Zur Vergleichmäßigung des Potentials der Wicklungen am Fuß und Kopf der Wicklungen können sogenannte Potentialringe vorgesehen werden, die den Abschluß des Schirmes nach oben oder unten bilden. Weitere Merkmale, die aus weiteren Unteransprüchen hervorgehen, werden in der Beschreibung erläutert.To equalize the potential of the windings at the foot and head of the windings, so-called potential rings can be provided, which form the end of the shield upwards or downwards. Further features that emerge from further subclaims are explained in the description.

Die Beschreibung erfolgt anhand eines in der Zeichnung dargestellten Ausführungsbeispieles. Die Figuren der Zeichnung zeigen:

  • Figur 1 Durchschnitt durch einen Phasenteil eines Trockentransformators;
  • Figur 2 einen Schnitt durch den Transformator gemäß II...II;
  • Figur 3 in Seitenansicht ein Ausführungsbeispiel eines für die Durchführung der Erfindung bestimmten Schirmes.
The description is based on an embodiment shown in the drawing. The figures in the drawing show:
  • Figure 1 average through a phase portion of a dry type transformer;
  • Figure 2 shows a section through the transformer according to II ... II;
  • 3 shows a side view of an embodiment of a screen intended for carrying out the invention.

In Figur 1 ist in teilweise geschnittener Seitenansicht ein Phasenteil 1 eines Trockentransformators dargestellt, das in seiner äußeren Abmessung einem der bekannten Netztransformatoren der Anmelderin im wesentlichen gleicht. Der Phasenteil 1 ist mit herausgezogenen Anschlüssen 2, 3 versehen, in denen geschützt die Anschlußelektroden 4 liegen. Die Elektroden 4 sind elektrisch verbunden mit der aus einzelnen Abschnitten bestehenden Oberspannungswicklung 5. Wie bekannt, ist die Oberspannungswicklung 5 um den Kern 6 herum angeordnet und in eine erstarrte Vergußmasse 7 eingebettet. Zur Kernmitte folgend ist weiterhin um den Kern 6 eine Unterspannungswicklung 8 vorgesehen, die in an sich bekannter Weise ebenfalls in einen entsprechende Vergußmasse 9 eingegossen ist.FIG. 1 shows a phase section 1 of a dry transformer in a partially sectioned side view, the outer dimensions of which are essentially the same as those of the applicant's known network transformers. The phase part 1 is provided with pulled out connections 2, 3, in which the connection electrodes 4 are protected. The electrodes 4 are electrically connected to the high-voltage winding 5 consisting of individual sections High-voltage winding 5 arranged around the core 6 and embedded in a solidified casting compound 7. Following the core center, an undervoltage winding 8 is also provided around the core 6, which is also cast into a corresponding casting compound 9 in a manner known per se.

Außerdem verlaufen Kühlkanäle 10 bzw. 11 axial und zirkumferential um den Kern, und zwar zwischen der Ober-und Unterspannungswicklung sowie zwischen Unterspannungswicklung 8 und Kern 6. Diese Konfiguration entspricht im wesentlichen noch dem Stand der Technik.In addition, cooling channels 10 and 11 run axially and circumferentially around the core, namely between the upper and lower voltage winding and between undervoltage winding 8 and core 6. This configuration essentially corresponds to the prior art.

Abweichend von dem Stand der Technik ist bei dem vorliegenden Trockentransformator im inneren Mantel der Oberspannungswicklung des Phasenteils 1 ein elektrisch leitfähiger, unmagnetischer Schirm 14 angeordnet, wobei jedoch in dem Schirm eine schmale Lücke (Spalt 23) vorgesehen ist, die von oben nach unten reicht, so daß eine über die gesamte Höhe reichende Leitfähigkeitsunterbrechung gegeben ist (vergl. Fig. 3). Der Schirm 14 liegt im vorliegenden Falle fest an der Innenseite der Vergußmasse 7 an, die einen zylindrischen Hohlmantel um die ihr zugeordnete Oberspannungswicklung bildet. Wird, wie vorzugsweise vorgesehen, der Schirm aus einem feinen Metalldrahtgewebe hergestellt, so wird dieses Gewebe mit an die Vergußmasse angegossen bzw. in diese eingegossen. Das Metallgewebe besteht beispielsweise aus einem feinen Kupfer-Draht mit einer Maschenweite von 1 - 2 mm Maschenweite. Die Maschenweite ist jedoch nicht kritisch, sondern wird in erster Linie durch vorgegebene, käuflich erhältliche Materialien bestimmt. Sie findet nach oben ihre Grenze in der elektrischen Potentialdurchdringung, wie dies dem Fachmann an sich bei derartigen Abschirmungen bekannt ist.In contrast to the prior art, in the present dry transformer an electrically conductive, non-magnetic shield 14 is arranged in the inner jacket of the high-voltage winding of the phase part 1, but a narrow gap (gap 23) is provided in the shield, which extends from top to bottom, so that there is a conductivity interruption extending over the entire height (see FIG. 3). In the present case, the screen 14 lies firmly against the inside of the casting compound 7, which forms a cylindrical hollow jacket around the high-voltage winding assigned to it. If, as is preferably provided, the screen is made from a fine metal wire mesh, this mesh is cast onto the casting compound or cast into it. The metal mesh, for example, consists of a fine copper wire with a mesh size of 1 - 2 mm mesh size. However, the mesh size is not critical, but is primarily determined by predetermined, commercially available materials. Its upper limit is the electrical potential penetration, as is known per se to the person skilled in the art with such shields.

Anstelle eines Metalldrahtgewebes kann der Schirm auch auf die Innenseite der Vergußmassen-Mantelung aufgalvanisiert sein, dort aufgeklebt oder anderweitig aufgetragen sein. Anstelle eines Reinmetall-Schirmes können auch entsprechende Legierungen verwendet werden; auch andere leitfähige Materialien, wie Graphit, sind geeignet. Die leitfähige Beschichtung kann mit Perforationen oder Unterbrechungen versehen sein, beispielsweise, um die Haftung zu verbessern. In jedem Falle muß eine ausgewogene Verteilung zwischen offenen und geschlossenen Bereichen gegeben sein, wobei der Fachmann durch einfaches Experimentieren eine entsprechende Konfiguration finden kann.Instead of a metal wire mesh, the screen can also be galvanized on the inside of the encapsulation compound, glued there or applied in some other way. Corresponding alloys can also be used instead of a pure metal screen; other conductive materials such as graphite are also suitable. The conductive coating can be perforated or interrupted, for example to improve adhesion. In any case, there must be a balanced distribution between open and closed areas, and the person skilled in the art can find a corresponding configuration by simple experimentation.

Wie sich aus der Figur 1 ferner ergibt, ist in diesem Ausführungsbeispiel auch die Unterspannungswicklung 8 beidseitig an dem aus der Vergußmasse gebildeten Mantel 9' mit weiteren Schirmen 15, 16 versehen, die ebenfalls fest an der Vergußmasse anliegen und jeweils an Luftkanäle, hier Luftkanäle 10, 11 angrenzen. Zu bemerken ist, daß der Schirm 16 zwischen Wicklung und Kern angebracht ist. Ein weiteres wesentliches Merkmal der schirme 14 - 16 ist, daß sie an einem gemeinsamen Erdpotential angelegt sind, welches durch eine nach außen geführte Litze 17 mit Anschluß elektrisch mit einer entsprechenden Erdleitung zu verbinden ist. Die Litze 17 ist über einen Kabelschuh 18 mit dem Schirm 14 bzw. 15 bzw. 16 verbunden. Die Schirme sind auch noch untereinander verbunden, wobei diese Verbindungen jedoch nicht im einzelnen dargestellt sind. Die Schirme 14, 15, 16 sind selbstverständlich nicht mit den Wicklungen verbunden!As can also be seen from FIG. 1, in this exemplary embodiment the undervoltage winding 8 is also provided on both sides on the sheath 9 ′ formed from the potting compound with further shields 15, 16, which also lie firmly against the potting compound and in each case against air channels, here air channels 10 , 11 adjoin. It should be noted that the screen 16 is attached between the winding and the core. Another essential feature of the shields 14-16 is that they are connected to a common earth potential, which is to be electrically connected to a corresponding earth line by means of a wire 17 which leads to the outside. The strand 17 is connected to the shield 14 or 15 or 16 via a cable lug 18. The screens are also connected to one another, but these connections are not shown in detail. The shields 14, 15, 16 are of course not connected to the windings!

In der Figur 2 ist ersichtlich, daß der Schirm 14 praktisch einen Bogen von 360° beschreibt, wobei im überlappungsbereich 20 sich die Seitenkanten etwa 10 - 20 mm überlappen, jedoch voneinander isoliert sind. Diese Anordnung soll auf der einen Seite eine vollständige Rundum-Abschirmung gewährleisten, während gleichzeitig keine weitere Spule dabei entstehen kann. Die Einzelheiten der Wicklungen sind in den Figuren nicht dargestellt.In FIG. 2 it can be seen that the screen 14 practically describes an arc of 360 °, the side edges overlapping approximately 10-20 mm in the overlap area 20, but being insulated from one another. This arrangement is intended on the one hand to ensure complete all-round shielding, while at the same time no further coil can arise. The details of the windings are not shown in the figures.

Figur 3 stellt isoliert einen Schirm 14 dar. Es ist erkennbar, daß der Schirm 14 ein etwa zylindrisches Gebilde mit offenen Grundseiten ist. Der Mantel wird durch ein feines Metalldrahtgewebe gebildet. Die Mantelkanten 20, 21 liegen im Ausführungsbeispiel gemäß Fig. 3 etwas voneinander entfernt (nicht überlappend), so daß sich ein schmaler Spalt 23 bildet. Weiterhin ist aus der Figur 3 ersichtlich, daß je ein Potentialring 24, 25 den oberen und unteren Abschluß des Schirmes 4 bildet, der mit dem Gewebematerial verlötet ist. Dieser Potentialring, dessen Kontur auch aus Figur 2 erkennbar ist, sorgt dafür, daß das Steupotential am Fuß und am Ende der Wicklung möglichst kleingehalten wird. Er besteht beispielsweise aus 2 - 3 mm starkem rundem Kupferdraht.FIG. 3 shows an umbrella 14 in isolation. It can be seen that the umbrella 14 is an approximately cylindrical structure with open base sides. The sheath is formed by a fine metal wire mesh. In the exemplary embodiment according to FIG. 3, the jacket edges 20, 21 lie somewhat apart (not overlapping), so that a narrow gap 23 is formed. It can also be seen from FIG. 3 that a potential ring 24, 25 forms the upper and lower end of the screen 4, which is soldered to the fabric material. This potential ring, the contour of which can also be seen in FIG. 2, ensures that the stepping potential at the foot and at the end of the winding is kept as small as possible. For example, it consists of 2 - 3 mm thick round copper wire.

Wesentlich erscheint es, daß die Schirme 14, 15, 16 einseitig fest anliegend mit der Vergußmasse verbunden sind, so daß auf dieser Seite sich keine Hohlräume bilden können, die die Wirkung beeinträchtigen könnten. Wie Messungen zeigen, lassen es die eingebauten Schirme zu, daß die lichte Weite der Luftkanäle wesentlich, teilweise bis über die Hälfte, verkleinert werden gegenüber Transformatoren mit gleicher Spannung.It appears essential that the screens 14, 15, 16 are firmly connected on one side to the casting compound, so that no cavities can form on this side which could impair the effect. As measurements show, the built-in screens allow the clear width of the air ducts to be significantly reduced, in some cases up to half, compared to transformers with the same voltage.

Claims (8)

1. Luftgekühlter Trockentransformator oder luftgekühlte Drosselspule mit wenigstens einer um den Kern angeordneten, in eine erstarrte Vergußmasse eingegossenen Wicklung, und axial verlaufenden Kühlkanälen zwischen den Wicklungen und/oder Wicklung und Kern,
gekennzeichnet durch
wenigstens einen geerdeten, elektrisch leitfähigen, unmagnetischen Schirm (14; 15; 16), der zwischen wenigstens je zwei Wicklungen (5; 8) und/oder zwischen der kernnächsten Wicklung (8) und Kern (6) den Kern zirkumferential umfassend oder fast umfassend, über die Wicklungshöhe reichend, angeordnet ist, welcher Schirm (14; 15; 16) wenigstens einseitig an einem kompakten, einer Wicklung zugeordneten, an einen Luftkanal grenzenden Vergußmassen-Mantel (9') fest anliegt oder dort in die Vergußmasse eingegossen ist, wobei, wenn vorhanden, wenigstens die Innenseite (Luftkanalseite) der Oberspannungswicklung mit einem Schirm (14) versehen ist.1. Air-cooled dry-type transformer or air-cooled choke coil with at least one winding arranged around the core, cast into a solidified casting compound, and axially extending cooling channels between the windings and / or winding and core,
marked by
at least one grounded, electrically conductive, non-magnetic shield (14; 15; 16) which, between at least two windings (5; 8) and / or between the closest winding (8) and core (6), comprises the core circumferentially or almost completely , reaching over the winding height, is arranged, which screen (14; 15; 16) at least on one side is firmly attached to a compact potting compound jacket (9 ') associated with a winding and adjoins an air duct, or is cast there into the potting compound, whereby , if present, at least the inside (air duct side) of the high-voltage winding is provided with a screen (14). 2. Transformator oder Drossel nach Anspruch 1, dadurch gekennzeichnet, daß der Schirm (14; 15; 16) aus einem zylindrisch gebogenen Metalldrahtgewebe besteht.2. Transformer or choke according to claim 1, characterized in that the screen (14; 15; 16) consists of a cylindrically curved metal wire mesh. 3. Transformator oder Drosselspule nach Anspruch 1, dadurch gekennzeichnet, daß der Schirm aus einer aufgalvanisierten, aufgeklebten oder anderweitig aufgetragenen leitfähigen Beschichtung besteht.3. Transformer or choke coil according to claim 1, characterized in that the screen consists of an electroplated, glued or otherwise applied conductive coating. 4. Transformator oder Drosselspule nach Anspruch 3, dadurch gekennzeichnet, daß die Beschichtung perforiert ist.4. Transformer or choke coil according to claim 3, characterized in that the coating is perforated. 5. Transformator oder Drosselspule nach Anspruch 1, dadurch gekennzeichnet, daß die Mantelfläche des Schirmes (14; 15; 16) wenigstens eine, über die gesamte Höhe reichende Leitfähigkeitsunterbrechung (23) aufweist.5. transformer or choke coil according to claim 1, characterized in that the outer surface of the screen (14; 15; 16) has at least one, over the entire height conductivity interruption (23). 6. Transformator oder Drosselspule nach Anspruch 5, dadurch gekennzeichnet, daß der Schirm im Bereich der Unterbrechung sich überlappende, isolierte Seitenkanten (21; 22) aufweist.6. Transformer or choke coil according to claim 5, characterized in that the screen has overlapping, insulated side edges (21; 22) in the region of the interruption. 7. Transformator oder Drosselspule nach Anspruch 1, dadurch gekennzeichnet, daß der Schirm auf wenigstens einer Grundseite Potentialringe (24; 25) aufweist.7. A transformer or choke coil according to claim 1, characterized in that the screen has potential rings (24; 25) on at least one base side. 8. Transformator oder Drosselspule nach Anspruch 1, dadurch gekennzeichnet, daß die Schirme mit einer Litze (17) zur Erdverbindung versehen sind.8. transformer or choke coil according to claim 1, characterized in that the shields are provided with a strand (17) for earth connection.
EP82101788A 1981-04-01 1982-03-06 Air-cooled dry type transformer or inductance Withdrawn EP0061608A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3113139 1981-04-01
DE19813113139 DE3113139A1 (en) 1981-04-01 1981-04-01 "DRY TRANSFORMER OR THROTTLE COIL WITH AIR COOLING"

Publications (1)

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EP0061608A1 true EP0061608A1 (en) 1982-10-06

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EP82101788A Withdrawn EP0061608A1 (en) 1981-04-01 1982-03-06 Air-cooled dry type transformer or inductance

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EP (1) EP0061608A1 (en)
JP (1) JPS5812313A (en)
DE (1) DE3113139A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3328375A1 (en) * 1982-08-07 1984-02-09 Mitsubishi Denki K.K., Tokyo Transformer
EP0718856A1 (en) * 1994-12-21 1996-06-26 Vacuumschmelze Gmbh Inductive component encapsulated in a potting compound
EP2075806A1 (en) 2007-12-27 2009-07-01 Elettromeccanica di Marnate S.p.A. Dry-type resin-insulated transformer with shielded side-by-side primary windings
EP2487697A1 (en) * 2011-02-08 2012-08-15 ABB Technology AG Dry-type transformer and method of manufacturing a dry-type transformer
EP2216793A3 (en) * 2009-02-05 2013-10-09 General Electric Company Cast-coil inductor
EP2833378A1 (en) * 2013-07-31 2015-02-04 ABB Technology AG Transformer
US20150109090A1 (en) * 2013-10-21 2015-04-23 Hammond Power Solutions, Inc. Electrical transformer with a shielded cast coil assembly
EP1864304B1 (en) * 2005-04-01 2015-05-20 Siemens Aktiengesellschaft Transformer provided with an electrical shielding
US9498442B2 (en) 2010-03-05 2016-11-22 Alfa Wassermann S.P.A. Rifaximin powder, process for preparing the same an controlled release compositions containing said rifaximin useful for obtaining a long-lasting effect
EP3125260A1 (en) * 2015-07-31 2017-02-01 ABB Technology AG Transformer for a modular, power electronic converter
EP3144944A1 (en) * 2015-09-18 2017-03-22 Siemens Aktiengesellschaft Electrical winding, dry transformer with such an electrical winding, and method for production of an electrical winding
DE102017221593A1 (en) * 2017-11-30 2019-06-06 Siemens Aktiengesellschaft winding arrangement
US11527934B2 (en) 2018-03-13 2022-12-13 Rolls-Royce Deutschland Ltd & Co Kg Electrical machine with voltage detection circuit

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DE3613690A1 (en) * 1986-04-23 1987-11-05 Koch & Sterzel Kg Self-supporting, screened primary high-voltage device, and a method for its production
JP5604864B2 (en) * 2009-12-24 2014-10-15 富士電機株式会社 Resin mold coil
BRPI1100186B1 (en) * 2011-02-02 2020-03-31 Siemens Aktiengesellschaft DRY DISTRIBUTION TRANSFORMER
JP5673252B2 (en) * 2011-03-16 2015-02-18 富士電機株式会社 Resin mold coil

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR564658A (en) * 1922-04-05 1924-01-08 Thomson Houston Comp Francaise Improvements to processors
DE1161643B (en) * 1959-02-03 1964-01-23 Licentia Gmbh High-voltage winding encapsulated with a low-pressure resin
DE1258966B (en) * 1964-04-27 1968-01-18 May & Christe Ges Mit Beschrae Air-cooled plastic transformer
DE1263184B (en) * 1960-12-27 1968-03-14 Transform Roentgen Matern Veb Process for wrapping a trapezoidal winding with casting resin
DE1268724B (en) * 1964-11-20 1968-05-22 Liebknecht Transformat Arrangement at transformers and instrument transformers to avoid sliding discharges
DE2161823A1 (en) * 1971-12-13 1972-07-06 Matsushita Electric Ind Co Ltd Coil arrangement for a transformer
US3708875A (en) * 1971-09-17 1973-01-09 Westinghouse Electric Corp Methods of constructing electrical inductive apparatus
FR2155913A2 (en) * 1971-10-08 1973-05-25 Bonnefond Bernard Atel
FR2248595A1 (en) * 1973-10-23 1975-05-16 Westinghouse Electric Corp
DE2548376A1 (en) * 1975-10-29 1977-05-05 Heibl Gmbh Apparatebau W Toroidal core repeater coil screen winding - has folded rectangular foils with plumed strips and adhesive tape

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR564658A (en) * 1922-04-05 1924-01-08 Thomson Houston Comp Francaise Improvements to processors
DE1161643B (en) * 1959-02-03 1964-01-23 Licentia Gmbh High-voltage winding encapsulated with a low-pressure resin
DE1263184B (en) * 1960-12-27 1968-03-14 Transform Roentgen Matern Veb Process for wrapping a trapezoidal winding with casting resin
DE1258966B (en) * 1964-04-27 1968-01-18 May & Christe Ges Mit Beschrae Air-cooled plastic transformer
DE1268724B (en) * 1964-11-20 1968-05-22 Liebknecht Transformat Arrangement at transformers and instrument transformers to avoid sliding discharges
US3708875A (en) * 1971-09-17 1973-01-09 Westinghouse Electric Corp Methods of constructing electrical inductive apparatus
FR2155913A2 (en) * 1971-10-08 1973-05-25 Bonnefond Bernard Atel
DE2161823A1 (en) * 1971-12-13 1972-07-06 Matsushita Electric Ind Co Ltd Coil arrangement for a transformer
FR2248595A1 (en) * 1973-10-23 1975-05-16 Westinghouse Electric Corp
DE2548376A1 (en) * 1975-10-29 1977-05-05 Heibl Gmbh Apparatebau W Toroidal core repeater coil screen winding - has folded rectangular foils with plumed strips and adhesive tape

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BULL. SEV/VSE, Band 66, Nr. 4, 22. Februar 1975, *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3328375A1 (en) * 1982-08-07 1984-02-09 Mitsubishi Denki K.K., Tokyo Transformer
EP0718856A1 (en) * 1994-12-21 1996-06-26 Vacuumschmelze Gmbh Inductive component encapsulated in a potting compound
EP1864304B1 (en) * 2005-04-01 2015-05-20 Siemens Aktiengesellschaft Transformer provided with an electrical shielding
EP2075806A1 (en) 2007-12-27 2009-07-01 Elettromeccanica di Marnate S.p.A. Dry-type resin-insulated transformer with shielded side-by-side primary windings
EP2216793A3 (en) * 2009-02-05 2013-10-09 General Electric Company Cast-coil inductor
US9498442B2 (en) 2010-03-05 2016-11-22 Alfa Wassermann S.P.A. Rifaximin powder, process for preparing the same an controlled release compositions containing said rifaximin useful for obtaining a long-lasting effect
WO2012107308A1 (en) * 2011-02-08 2012-08-16 Abb Technology Ag Dry-type transformer and method of manufacturing a dry-type transformer
US9424974B2 (en) 2011-02-08 2016-08-23 Abb Technology Ag Dry-type transformer and method of manufacturing a dry-type transformer
EP2487697A1 (en) * 2011-02-08 2012-08-15 ABB Technology AG Dry-type transformer and method of manufacturing a dry-type transformer
EP2833378A1 (en) * 2013-07-31 2015-02-04 ABB Technology AG Transformer
US20150109090A1 (en) * 2013-10-21 2015-04-23 Hammond Power Solutions, Inc. Electrical transformer with a shielded cast coil assembly
EP3125260A1 (en) * 2015-07-31 2017-02-01 ABB Technology AG Transformer for a modular, power electronic converter
EP3144944A1 (en) * 2015-09-18 2017-03-22 Siemens Aktiengesellschaft Electrical winding, dry transformer with such an electrical winding, and method for production of an electrical winding
CN107039159A (en) * 2015-09-18 2017-08-11 西门子公司 Electric winding, the dry-type transformer with electric winding and the method for manufacturing electric winding
DE102017221593A1 (en) * 2017-11-30 2019-06-06 Siemens Aktiengesellschaft winding arrangement
US11527934B2 (en) 2018-03-13 2022-12-13 Rolls-Royce Deutschland Ltd & Co Kg Electrical machine with voltage detection circuit

Also Published As

Publication number Publication date
DE3113139A1 (en) 1982-10-21
JPS5812313A (en) 1983-01-24

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