EP0653767A1 - Transformer for medium voltage - Google Patents

Transformer for medium voltage Download PDF

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Publication number
EP0653767A1
EP0653767A1 EP94115707A EP94115707A EP0653767A1 EP 0653767 A1 EP0653767 A1 EP 0653767A1 EP 94115707 A EP94115707 A EP 94115707A EP 94115707 A EP94115707 A EP 94115707A EP 0653767 A1 EP0653767 A1 EP 0653767A1
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EP
European Patent Office
Prior art keywords
magnetic core
winding
transducer according
electrical
following
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Granted
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EP94115707A
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German (de)
French (fr)
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EP0653767B1 (en
Inventor
Karl Dipl.-Ing. Stegmüller
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Schneider Electric Sachsenwerk GmbH
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Sachsenwerk AG
AEG Sachsenwerk GmbH
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Publication of EP0653767A1 publication Critical patent/EP0653767A1/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/24—Voltage transformers
    • H01F38/26—Constructions

Definitions

  • the invention relates to an inductive electrical converter according to the preamble of the first claim.
  • the invention has for its object to take measures in a converter according to the preamble of the first claim, through which cavities enclosed with a simple structure can be easily mastered in terms of insulation technology.
  • a simple, prefabricated casing in which the magnetic core with the associated windings is fixed without the aid of electrically insulating casting resins or the like, including any cavities.
  • the insulating gas filling made of SF6 or similar insulating gases, which is preferably introduced into the casing under excess pressure, brings about the reliable electrical insulation in the area of the design-related cavities.
  • All that is required for the sheathing is a simple tubular body made of electrical insulating material, the end faces of which are to be closed with a tightly attached flange each time the magnetic core with the windings is inserted into the tubular body.
  • the flanges can be connected in a simple manner by gluing their edge region to the tubular body, pressure bonding preferably being carried out.
  • the primary winding in particular, is constructed from a plurality of independent and electrically series-connected disc coils, the free winding end of the one axially terminal disc coil being connected to high-voltage potential and the free winding connection of the last disc coil axially distant therefrom being connected to ground potential.
  • the secondary winding is then also arranged adjacent to this last disk coil, so that there is only a negligible electrical voltage potential between these two coils, which is easy to master in terms of insulation technology.
  • the magnetic core in several parts in order to match the necessary one to be able to adjust the axial length of the primary winding including the secondary winding.
  • the magnetic core consists of a magnetic material which has a very low electrical conductivity, that is to say acts as an electrical insulator.
  • the magnetic core does not form an electrical short circuit for the electrical field between the high-voltage connection and the ground connection, so that, in particular when the magnetic core is connected to ground potential, the same does not transmit the ground potential over the entire axial length of the primary winding in the region of the connection on the high-voltage side.
  • the magnetic core forms an electrical insulation, so that the voltage drop that occurs over the length of the primary winding is also formed on the insulating magnetic core by, in particular, capacitive coupling.
  • the voltage difference between the individual sections of the primary winding and the magnetic core is thus small, so that correspondingly small insulation distances are sufficient for safe operation.
  • the SF6 insulation in conjunction with the electrically insulating magnetic core and the primary coil which is designed in the manner of a chamber coil that reduces the voltage drop in stages, enable the construction of a voltage converter for medium voltage in a very small design.
  • An inductive electrical voltage converter for medium-voltage networks has a soft magnetic core 1, which has a low magnetic remanence has and is assigned a primary winding made up of a plurality of axially lined-up disc coils 2 and a further disc winding arranged in the axial extension and used as a secondary winding 3.
  • This arrangement is located within an envelope made of an electrically insulating tubular body 4, the end faces of which are each closed by a tightly attached flange 5.
  • the sheath 4.5 surrounds the magnetic core 1 with the windings 2, 3 gas-tight, the design-related cavities in the area of the magnetic core with its windings 2, 3 and the inner jacket of the sheath 4, 5 being filled with an insulating gas which has a higher insulation value than Has air and is especially sulfur hexafluoride, i.e. SF6 or a similar insulating gas.
  • an insulating gas which has a higher insulation value than Has air and is especially sulfur hexafluoride, i.e. SF6 or a similar insulating gas.
  • the pressure of the insulating gas filling can be chosen higher than the external atmospheric pressure.
  • the sheathing can be represented in a simple manner after only one insulating tube section is to be closed at both ends with the flanges, which consist in particular of metal, it being possible for the connection between the edge of the flanges and the relevant section of the tube body to be made by gluing by means of an interposed adhesive 6.
  • the bond is in particular formed as a pressure bond, so that the gas-tight enclosure of the magnetic core 1 and windings 2, 3 is ensured over a long period of time.
  • the magnetic core 1 consists in particular of an electrically insulating magnetic material, preferably based on ferrites, which, with good magnetic properties, have a very low electrical conductivity, ie form electrical insulators. This avoids that the same potential, in particular earth or ground potential, is not brought to every point of the assigned windings 2, 3 in relation to a metallic magnetic core.
  • the design of the primary coil as a chamber coil or as an axial sequence of individual disk coils has an advantageous effect because the voltage drop over the axial length from disk coil to disk coil is then gradually reduced to the ground potential to which the last disk coil is connected. This results in a large electrically effective path between the winding connections of the primary coil, which is not shortened here by the combination with the magnetic core acting as an electrical insulator.
  • the secondary winding 3 is arranged in the axial direction of the terminal disk coil 2.5 adjacent to the primary winding 2, the free winding connection 7 of which is to be connected to ground potential.
  • the electrical voltage gradient between the disk coil 2.5 and the secondary winding 3 is so small that the insulation of the coil formers is sufficient, on which the individual disk coils 2.1 to 2.5 or the secondary winding 3 are wound.
  • the independent disc coils 2.1 to 2.5 make it possible to vary the voltage range to be detected accordingly. It is therefore easily possible to adapt the converter structure for the voltage series for 12 kV, 24 kV or 36 kV in a simple manner.
  • the axial end faces of the disk coils 2.1 to 2.5 can be provided with coordinated contact contact surfaces 8, which come into mutual contact when the coil disks are strung together and thus accomplish the series connection automatically without special aids.
  • the magnetic core 1 is also constructed from a plurality of core parts 1.1 or 1.2 which can be joined together in the axial direction and which are to be inserted between terminal core parts 1.3 as required.
  • the Magnetic core at least two in cross-section E-shaped end core parts 1.3, which face each other with their open sides and between which the windings 2,3 are located. In the shortest embodiment, the two end core parts are sufficient. If the detectable voltage range of the converter is to be increased, one or more additional disk coils must be used. In order to close the gap between the end core parts 1.3, one or more of the intermediate core parts 1.1 or 1.2 are interposed. The intermediate core parts 1.2 are inserted into the center of the disc coils, while the outer intermediate core parts 1.1 are arranged in the region of the outer circumference of the disc coils. The intermediate core parts 1.1 can be designed as rings encompassing the disc coils. Depending on the voltage range to be detected, several of the intermediate core parts 1.1 or 1.2 can also be placed between the terminating core parts 1.3.
  • the winding connection 8.1 to be connected to the high-voltage source on that of the disk winding 2.1 which is the most distant from the primary winding can be directly connected in an electrically conductive manner to the adjacent flange 5 because the magnetic core is designed to be electrically insulating.
  • a mechanical compression spring 9 can be used between this flange 5 and the adjacent end core part 1.3, which axially compresses the multi-part magnetic core 1 and thereby reduces the gaps in the magnetic circuit which adversely affect the magnetic flux to a minimum.
  • the winding connection 7 to be connected to ground potential, as well as the winding connections 10, 11 of the secondary coil 3, are guided to separate connection elements in a connection box 12 which is provided on the flange arranged adjacent to the secondary coil 3.
  • This flange 5 can also be at ground potential be turned on.
  • insulator rings 13 pointing radially outward to the outer circumferential surface of the tubular body 4.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

An inductive electrical transformer for medium voltage has a soft-magnetic core (1) to which a primary winding (2) and a secondary winding (3) are assigned within a casing (4,5). In order to achieve a high level of operational reliability with a simple structure, the casing (4,5) encloses the magnetic core (1), with the windings (2,3), on all sides in a gas-tight manner, the cavity which accommodates the magnetic core with the windings being filled with SF6 insulating gas. <IMAGE>

Description

Die Erfindung betrifft einen induktiven elektrischen Wandler gemäß dem Oberbegriff des ersten Anspruchs.The invention relates to an inductive electrical converter according to the preamble of the first claim.

Es ist bei elektrischen Wandlern für die Anwendung in Mittelspannungsnetzen ganz allgemein bekannt, auf einen weichmagnetischen Magnetkern eine Primärwicklung und eine Sekundärwicklung in konzentrischer Anordnung aufzuwickeln und die Gesamtanordnung anschließend mit fließfähigem, aushärtendem Isolierstoff zu umhüllen. Von Nachteil ist dabei jedoch, daß bei der Gießharzumhüllung nicht mit Sicherheit vermieden werden kann, daß insbesondere in den Spalten zwischen den Wicklungen und dem Magnetkern oder auch zwischen den Außenseiten des Magnetkerns und der Umhüllung ein oder mehrere luftgefüllte Hohlräume verbleiben, welche zu elektrischen Sprüherscheinungen und zu Durchschlägen führen können.It is very well known in electrical converters for use in medium-voltage networks to wind a primary winding and a secondary winding in a concentric arrangement on a soft magnetic magnetic core and then to encase the entire arrangement with flowable, hardening insulating material. The disadvantage here, however, is that it cannot be reliably avoided with the cast resin coating that one or more air-filled cavities remain in the gaps between the windings and the magnetic core or also between the outer sides of the magnetic core and the coating, which lead to electrical spray phenomena and can lead to breakthroughs.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Wandler gemäß dem Oberbegriff des ersten Anspruchs Maßnahmen zu treffen, durch welche bei einfachem Aufbau eingeschlossene Hohlräume isolationstechnisch einfach zu beherrschen sind.The invention has for its object to take measures in a converter according to the preamble of the first claim, through which cavities enclosed with a simple structure can be easily mastered in terms of insulation technology.

Die Lösung dieser Aufgabe erfolgt gemäß der Erfindung durch die kennzeichnenden Merkmale des ersten Anspruchs.This object is achieved according to the invention by the characterizing features of the first claim.

Bei einem Aufbau eines Wandlers gemäß der Erfindung kann eine einfache, vorgefertigte Umhüllung zur Anwendung gelangen, in welche der Magnetkern mit den zugehörigen Wicklungen auch ohne Zuhilfenahme von elektrisch isolierenden Gießharzen oder dgl. unter Einschluß beliebiger Hohlräume festgesetzt wird. Die in die Umhüllung vorzugsweise unter Überdruck eingebrachte Isoliergasfüllung aus SF6-oder ähnlichen Isoliergasen bewirkt hier die zuverlässige elektrische Isolierung im Bereich der konstruktionsbedingten Hohlräume. Für die Umhüllung ist dabei lediglich ein einfacher Rohrkörper aus elektrischem Isolierstoff notwendig, dessen Stirnflächen mit je einem dicht angesetzten Flansch zu verschließen sind, wenn der Magnetkern mit den Wicklungen in den Rohrkörper eingesetzt ist. Die Verbindung der Flansche kann dabei in einfacher Weise durch Verkleben ihres Randbereichs mit dem Rohrkörper erfolgen, wobei vorzugsweise eine Druckklebung durchgeführt wird.In the construction of a transducer according to the invention, a simple, prefabricated casing can be used, in which the magnetic core with the associated windings is fixed without the aid of electrically insulating casting resins or the like, including any cavities. The insulating gas filling made of SF6 or similar insulating gases, which is preferably introduced into the casing under excess pressure, brings about the reliable electrical insulation in the area of the design-related cavities. All that is required for the sheathing is a simple tubular body made of electrical insulating material, the end faces of which are to be closed with a tightly attached flange each time the magnetic core with the windings is inserted into the tubular body. The flanges can be connected in a simple manner by gluing their edge region to the tubular body, pressure bonding preferably being carried out.

In vorteilhafter Ausgestaltung ist insbesondere die Primärwicklung aus mehreren axial aneinander anschließenden eigenständigen und elektrisch in Serie geschalteten Scheibenspulen aufgebaut, wobei das freie Wicklungsende der einen axial endständigen Scheibenspule an Hochspannungspotential und der freie Wicklungsanschluß der davon axial entfernten letzten Scheibenspule mit Massepotential zu verbinden ist. Benachbart zu dieser letzten Scheibenspule ist dann auch die Sekundärwicklung angeordnet, so daß zwischen diesen beiden Spulen nur ein vernachlässigbares elektrisches Spannungspotential besteht, das isolationstechnisch leicht zu beherrschen ist. Bei diesem Wicklungsaufbau ist es von besonderem Vorteil, daß je nach Höhe zu messender Hochspannung die Anzahl der primärseitigen Scheibenspulen entsprechend vergrößert oder verkleinert werden kann. Dabei ist es zweckmäßig, auch den Magnetkern mehrteilig auszubilden, um ihn an die notwendige axiale Länge der Primärwicklung einschließlich der Sekundärwicklung anpassen zu können. Insbesondere besteht der Magnetkern zumindest im Bereich der Primärwicklung aus einem Magnetwerkstoff, der eine sehr geringe elektrische Leitfähigkeit aufweist, also als elektrischer Isolator wirkt. Dadurch bildet der Magnetkern keinen elektrischen Kurzschluß für das elektrische Feld zwischen dem Hochspannungsanschluß und dem Masseanschluß, so daß insbesondere bei an Massepotential angeschlossenem Magnetkern derselbe das Massepotential nicht über die gesamte axiale Länge der Primärwicklung in den Bereich des hochspannungsseitigen Anschlusses überträgt. Vielmehr bildet der Magnetkern eine elektrische Isolation, so daß sich der über die Länge der Primärwicklung einstellende Spannungsabfall durch insbesondere kapazitive Kopplung auch am isolierendem Magnetkern ausbildet. Die Spannungsdifferenz zwischen den einzelnen Abschnitten der Primärwicklung und dem Magnetkern ist somit gering, so daß auch entsprechend kleine Isolationsabstände für einen sicheren Betrieb ausreichen. Die SF6-Isolierung in Verbindung mit dem elektrisch isolierenden Magnetkern und der nach Art einer den Spannungsabfall in Stufen abbauenden Kammerspule ausgebildeten Primärspule ermöglichen den Aufbau eines Spannngswandlers für Mittelspannung in sehr kleiner Bauweise.In an advantageous embodiment, the primary winding, in particular, is constructed from a plurality of independent and electrically series-connected disc coils, the free winding end of the one axially terminal disc coil being connected to high-voltage potential and the free winding connection of the last disc coil axially distant therefrom being connected to ground potential. The secondary winding is then also arranged adjacent to this last disk coil, so that there is only a negligible electrical voltage potential between these two coils, which is easy to master in terms of insulation technology. With this winding structure, it is particularly advantageous that, depending on the high voltage to be measured, the number of primary-side disc coils can be increased or decreased accordingly. It is expedient to also design the magnetic core in several parts in order to match the necessary one to be able to adjust the axial length of the primary winding including the secondary winding. In particular, at least in the area of the primary winding, the magnetic core consists of a magnetic material which has a very low electrical conductivity, that is to say acts as an electrical insulator. As a result, the magnetic core does not form an electrical short circuit for the electrical field between the high-voltage connection and the ground connection, so that, in particular when the magnetic core is connected to ground potential, the same does not transmit the ground potential over the entire axial length of the primary winding in the region of the connection on the high-voltage side. Rather, the magnetic core forms an electrical insulation, so that the voltage drop that occurs over the length of the primary winding is also formed on the insulating magnetic core by, in particular, capacitive coupling. The voltage difference between the individual sections of the primary winding and the magnetic core is thus small, so that correspondingly small insulation distances are sufficient for safe operation. The SF6 insulation in conjunction with the electrically insulating magnetic core and the primary coil, which is designed in the manner of a chamber coil that reduces the voltage drop in stages, enable the construction of a voltage converter for medium voltage in a very small design.

Andere vorteilhafte Ausgestaltungen der Erfindung sind in zusätzlichen Ansprüchen angegeben.Other advantageous embodiments of the invention are specified in additional claims.

Die Erfindung ist nachfolgend anhand der Prinzipskizze eines im Längsschnitt dargestellten Spannungswandlers näher erläutert.The invention is explained below with reference to the schematic diagram of a voltage converter shown in longitudinal section.

Ein induktiver elektrischer Spannungswandler für Mittelspannungsnetze weist einen weichmagnetischen Magnetkern 1 auf, der eine geringe magnetische Remanenz besitzt und dem eine Primärwicklung aus mehreren axial aneinander gereihten Scheibenspulen 2 sowie einer weiteren, in der axialen Verlängerung angeordneten, als Sekundärwicklung 3 genutzten Scheibenwicklung zugeordnet ist. Diese Anordnung befindet sich innerhalb einer Umhüllung aus einem elektrisch isolierenden Rohrkörper 4, dessen Stirnflächen mit je einem dicht angesetzten Flansch 5 verschlossen sind. Die Umhüllung 4,5 umschließt den Magnetkern 1 mit den Wicklungen 2,3 gasdicht, wobei die konstruktionsbedingten Hohlräume im Bereich des Magnetkerns mit seinen Wicklungen 2,3 und dem Innenmantel der Umhüllung 4,5 mit einem Isoliergas gefüllt ist, das einen höheren Isolationswert als Luft aufweist und insbesondere Schwefelhexafluorid, also SF6 oder ein ähnliches Isoliergas ist. Zur Verbesserung der Isolationswirkung kann der Druck der Isoliergasfüllung höher als der äußere Atmosphärendruck gewählt werden. Die Umhüllung ist dabei in einfacher Weise darstellbar, nachdem lediglich ein Isolierstoffrohrabschnitt beidendig mit den insbesondere aus Metall bestehenden Flanschen abzuschließen ist, wobei die Verbindung zwischen dem Rand der Flansche und dem betreffenden Abschnitt des Rohrkörpers durch Verkleben mittels eines zwischengefügten Klebstoffs 6 erfolgen kann. Die Klebung wird dabei insbesondere als Druckklebung ausgebildet, so daß der gasdichte Umschluß von Magnetkern 1 und Wicklungen 2,3 über einen langen Zeitraum sichergestellt ist.An inductive electrical voltage converter for medium-voltage networks has a soft magnetic core 1, which has a low magnetic remanence has and is assigned a primary winding made up of a plurality of axially lined-up disc coils 2 and a further disc winding arranged in the axial extension and used as a secondary winding 3. This arrangement is located within an envelope made of an electrically insulating tubular body 4, the end faces of which are each closed by a tightly attached flange 5. The sheath 4.5 surrounds the magnetic core 1 with the windings 2, 3 gas-tight, the design-related cavities in the area of the magnetic core with its windings 2, 3 and the inner jacket of the sheath 4, 5 being filled with an insulating gas which has a higher insulation value than Has air and is especially sulfur hexafluoride, i.e. SF6 or a similar insulating gas. To improve the insulation effect, the pressure of the insulating gas filling can be chosen higher than the external atmospheric pressure. The sheathing can be represented in a simple manner after only one insulating tube section is to be closed at both ends with the flanges, which consist in particular of metal, it being possible for the connection between the edge of the flanges and the relevant section of the tube body to be made by gluing by means of an interposed adhesive 6. The bond is in particular formed as a pressure bond, so that the gas-tight enclosure of the magnetic core 1 and windings 2, 3 is ensured over a long period of time.

Der Magnetkern 1 besteht insbesondere aus einem elektrisch isolierenden Magnetwerkstoff, vorzugsweise auf der Basis von Ferriten, die bei guter magnetischer eine sehr geringe elektrische Leitfähigkeit aufweisen, also elektrische Isolatoren bilden. Dadurch wird vermieden, daß gegenüber einem metallischen Magnetkenrn nicht an jede Stelle der zugeordneten Wicklungen 2,3 das gleiche Potential, insbesondere Erd- oder Massepotential herangeführt wird.The magnetic core 1 consists in particular of an electrically insulating magnetic material, preferably based on ferrites, which, with good magnetic properties, have a very low electrical conductivity, ie form electrical insulators. This avoids that the same potential, in particular earth or ground potential, is not brought to every point of the assigned windings 2, 3 in relation to a metallic magnetic core.

Dabei wirkt sich die Ausbildung der Primärspule als Kammerspule bzw. als axiale Aneinanderreihung von einzelnen Scheibenspulen insofern vorteilhaft aus, weil dann der Spannungsabfall über die axiale Länge von Scheibenspule zu Scheibenspule stufig bis zum Massepotential abgebaut wird, an welches die letzte Scheibenspule gelegt ist. Es ergibt sich dadurch zwischen den Wicklungsanschlüssen der Primärspule ein großer elektrisch wirksamer Weg, der hier durch die Kombination mit dem als elektrischer Isolator wirkenden Magnetkern nicht verkürzt wird.The design of the primary coil as a chamber coil or as an axial sequence of individual disk coils has an advantageous effect because the voltage drop over the axial length from disk coil to disk coil is then gradually reduced to the ground potential to which the last disk coil is connected. This results in a large electrically effective path between the winding connections of the primary coil, which is not shortened here by the combination with the magnetic core acting as an electrical insulator.

Die Sekundärwicklung 3 ist in axialer Richtung der endständigen Scheibenspule 2.5 der Primärwicklung 2 benachbart angeordnet, deren freier Wicklungsanschluß 7 an Massepotential anzuschalten ist. Das elektrische Spannungsgefälle zwischen der Scheibenspule 2.5 und der Sekundärwicklung 3 ist dadurch so gering, daß die Isolation der Spulenkörper ausreicht, auf welche die einzelnen Scheibenspulen 2.1 bis 2.5 bzw. die Sekundärwicklung 3 aufgewickelt sind.The secondary winding 3 is arranged in the axial direction of the terminal disk coil 2.5 adjacent to the primary winding 2, the free winding connection 7 of which is to be connected to ground potential. The electrical voltage gradient between the disk coil 2.5 and the secondary winding 3 is so small that the insulation of the coil formers is sufficient, on which the individual disk coils 2.1 to 2.5 or the secondary winding 3 are wound.

Die eigenständigen Scheibenspulen 2.1 bis 2.5 ermöglichen es, den zu erfassenden Spannungsbereich entsprechen zu variieren. Es ist somit ohne weiteres möglich, den Wandleraufbau für die Spannungsreihen für z.B. 12 kV, 24 kV oder 36 kV in einfacher Weise anzupassen. Hierfür können die axialen Stirnseiten der Scheibenspulen 2.1 bis 2.5 mit aufeinander abgestimmten Kontaktanlageflächen 8 versehen sein, die beim Aneinanderreihen der Spulenscheiben in gegenseitige Kontaktanlage treten und so die Reihenschaltung selbsttätig ohne besondere Hilfsmittel bewerkstelligen. Zur Anpassung an die axiale Länge der Primärspule ist auch der Magnetkern 1 aus mehreren in axialer Richtung aneinanderfügbaren Kernteilen 1.1 bzw. 1.2 aufgebaut, die je nach Bedarf zwischen endständige Abschluß-Kernteile 1.3 einzufügen sind. Dabei weist der Magnetkern wenigstens zwei im Querschnitt E-förmige Abschluß-Kernteile 1.3 auf, die mit ihren offenen Seiten gegeneinanderweisen und zwischen welchen die Wicklungen 2,3 liegen. In der kürzesteten Ausführungsform genügen die beiden Abschluß-Kernteile. Soll der erfaßbare Spannungsbereich des Wandlers vergrößert werden, müssen eine oder mehrere weitere Scheibenspulen eingesetzt werden. Um dabei den Spalt zwischen den Abschluß-Kernteilen 1.3 zu schließen, werden ein oder mehrere der Zwischen-Kernteile 1.1 bzw. 1.2 zwischengefügt. Dabei werden die ZwischenKernteile 1.2 in das Zentrum der Scheibenspulen eingesetzt, während die äußeren Zwischen-Kernteile 1.1 im Bereich des Außenumfangs der Scheibenspulen angeordnet werden. Die Zwischen-Kernteile 1.1 können dabei als die Scheibenspulen umgreifende Ringe ausgebildet sein. Es können also je nach zu erfassendem Spannungsbereich auch mehrere der ZwischenKernteile 1.1 bzw. 1.2 zwischen die Abschluß-Kernteile 1.3 gesetzt werden.The independent disc coils 2.1 to 2.5 make it possible to vary the voltage range to be detected accordingly. It is therefore easily possible to adapt the converter structure for the voltage series for 12 kV, 24 kV or 36 kV in a simple manner. For this purpose, the axial end faces of the disk coils 2.1 to 2.5 can be provided with coordinated contact contact surfaces 8, which come into mutual contact when the coil disks are strung together and thus accomplish the series connection automatically without special aids. In order to adapt to the axial length of the primary coil, the magnetic core 1 is also constructed from a plurality of core parts 1.1 or 1.2 which can be joined together in the axial direction and which are to be inserted between terminal core parts 1.3 as required. The Magnetic core at least two in cross-section E-shaped end core parts 1.3, which face each other with their open sides and between which the windings 2,3 are located. In the shortest embodiment, the two end core parts are sufficient. If the detectable voltage range of the converter is to be increased, one or more additional disk coils must be used. In order to close the gap between the end core parts 1.3, one or more of the intermediate core parts 1.1 or 1.2 are interposed. The intermediate core parts 1.2 are inserted into the center of the disc coils, while the outer intermediate core parts 1.1 are arranged in the region of the outer circumference of the disc coils. The intermediate core parts 1.1 can be designed as rings encompassing the disc coils. Depending on the voltage range to be detected, several of the intermediate core parts 1.1 or 1.2 can also be placed between the terminating core parts 1.3.

Der mit der Hochspannungsquelle zu verbindende Wicklungsanschluß 8.1 an der der von der Primärwicklung am weitesten entfernten Scheibenwicklung 2.1 kann unmittelbar mit dem benachbart angeordneten Flansch 5 elektrisch leitend verbunden werden, weil der Magnetkern in sich elektrisch isolierend ausgebildet ist. Dabei kann zwischen diesen Flansch 5 und den benachbarten Abschluß-Kernteil 1.3 eine mechanische Druckfeder 9 eingesetzt werden, die den mehrteiligen Magnetkern 1 axial zusammendrückt und dadurch die den magnetischen Fluß nachteilig beeinträchtigenden Spalte im magnetischen Kreis auf ein Minimum reduziert. Dagegen ist der mit Massepotential zu verbindende Wicklungsanschluß 7 wie auch die Wicklungsanschlüsse 10,11 der Sekundärspule 3 an getrennte Anschlußelemente in einem Anschlußkasten 12 geführt, der am benachbart zur Sekundärspule 3 angeordneten Flansch vorgesehen ist. Dabei kann dieser Flansch 5 ebenfalls an Massepotential angeschaltet sein. Um dabei dem äußeren Kriechstromweg zwischen den Flanschen 5 zu verlängern, ist es zweckmäßig, auf die äußere Mantelfläche des Rohrkörpers 4 radial nach außen weisende Isolatorringe 13 aufzubringen.The winding connection 8.1 to be connected to the high-voltage source on that of the disk winding 2.1 which is the most distant from the primary winding can be directly connected in an electrically conductive manner to the adjacent flange 5 because the magnetic core is designed to be electrically insulating. A mechanical compression spring 9 can be used between this flange 5 and the adjacent end core part 1.3, which axially compresses the multi-part magnetic core 1 and thereby reduces the gaps in the magnetic circuit which adversely affect the magnetic flux to a minimum. On the other hand, the winding connection 7 to be connected to ground potential, as well as the winding connections 10, 11 of the secondary coil 3, are guided to separate connection elements in a connection box 12 which is provided on the flange arranged adjacent to the secondary coil 3. This flange 5 can also be at ground potential be turned on. In order to extend the outer leakage current path between the flanges 5, it is expedient to apply insulator rings 13 pointing radially outward to the outer circumferential surface of the tubular body 4.

Claims (14)

Induktiver elektischer Wandler, insbesondere Spannungswandler, für Mittelspannung, mit einem weichmagnetischen Magnetkern und demselben zugeordneter Primär- und Sekundärwicklung und mit einer den Magnetkern mit den Wicklungen umschließenden Umhüllung aus festem elektrischen Isolierstoff, dadurch gekennzeichnet, daß die Umhüllung (4,5) den Magnetkern (1) mit den Wicklungen (2,3) allseitig gasdicht umschließt und daß innerhalb der Umhüllung (4,5) vorhandene Hohlräume mit einem Isoliergas, insbesondere mit SF6 oder dergl., gefüllt sind.Inductive electrical converter, in particular voltage converter, for medium voltage, with a soft magnetic magnetic core and the primary and secondary winding assigned to it and with a covering of solid electrical insulating material enclosing the magnetic core with the windings, characterized in that the covering (4, 5) has the magnetic core ( 1) encloses gas-tight on all sides with the windings (2, 3) and that cavities within the covering (4, 5) are filled with an insulating gas, in particular with SF6 or the like. Wandler nach Anspruch 1, dadurch gekennzeichnet, daß der Druck der Isoliergasfüllung höher als der Atmosphärendruck ist.Converter according to claim 1, characterized in that the pressure of the insulating gas filling is higher than the atmospheric pressure. Wandler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Umhüllung einen Rohrkörper (4) aus elektrischem Isolierstoff aufweist, dessen Stirnflächen mit je einem dicht angesetzten metallischen Flansch (5) verschlossen sind.Transducer according to Claim 1 or 2, characterized in that the casing has a tubular body (4) made of electrical insulating material, the end faces of which are closed by a tightly attached metallic flange (5). Wandler nach Anspruch 3, dadurch gekennzeichnet, daß die Flansche (5) in ihrem Randbereich mit dem Rohrkörper (4) verklebt sind.Transducer according to Claim 3, characterized in that the flanges (5) are glued to the tubular body (4) in their edge region. Wandler nach Anspruch 4, dadurch gekennzeichnet, daß die Flansche (5) aus Aluminium bestehen und mittels Druckklebung mit dem Rohrkörper (4) verklebt sind.Transducer according to claim 4, characterized in that the flanges (5) consist of aluminum and are glued to the tubular body (4) by means of pressure adhesive. Wandler nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die Primärwicklung (2) nach Art einer Kammerspule aus mehreren axial aneinander anschließenden eigenständigen, in Serie geschalteten Scheibenspule (2.1-2.5) aufgebaut ist, von welchen eine erste axial endständige Scheibenspule (2.1) an eine elektrische Spannungsquelle und die axial entfernteste (2,5) an Massepotential anzuschließen ist und daß letzterer Scheibenspuel (2.5) die Sekundärwicklung (3) axial benachbart zugeordnet ist.Converter according to Claim 1 or one of the following, characterized in that the primary winding (2) is constructed in the manner of a chamber coil from a plurality of independent disc coils (2.1-2.5) connected in series, of which a first axially terminal disc coil (2.1 ) is to be connected to an electrical voltage source and the axially most distant one (2,5) to ground potential and that the latter disc washer (2.5) is assigned to the secondary winding (3) axially adjacent. Wandler nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der Magnetkern (1) zumindest im Bereich der Primärwicklung (2) aus einem Magnetwerkstoff besteht, der eine sehr geringe elektrische Leitfähigkeit aufweist.Transducer according to Claim 1 or one of the following, characterized in that the magnetic core (1), at least in the region of the primary winding (2), consists of a magnetic material which has a very low electrical conductivity. Wandler nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der mit der Spannungsquelle zu verbindende Wicklungsanschluß (8.1) der Primärwicklung (2) unmittelbar mit dem benachbart angeordneten Flansch (5) elektrisch leitend verbunden ist.Converter according to Claim 1 or one of the following, characterized in that the winding connection (8.1) of the primary winding (2) to be connected to the voltage source is directly connected in an electrically conductive manner to the adjacent flange (5). Wandler nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der mit Massepotential zu verbindende Wicklungsanschluß (7) und die Wicklungsanschlüsse (11,12) der Sekundärspule (3) an Anschlußelemente geführt sind, die an dem benachbart zur Sekundärwicklung (3) angeordneten Flansch (5) vorgesehen sind.Converter according to Claim 1 or one of the following, characterized in that the winding connection (7) to be connected to ground potential and the winding connections (11, 12) of the secondary coil (3) are guided on connection elements which are arranged on the element adjacent to the secondary winding (3) Flange (5) are provided. Wandler nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der Magnetkern (1) aus in axialer Richtung aneinander anschließenden Kernteilen (1.1,1.2,1.3) gebildet ist.Transducer according to Claim 1 or one of the following, characterized in that the magnetic core (1) is formed from core parts (1.1, 1.2, 1.3) which adjoin one another in the axial direction. Wandler nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der Magnetkern (1) wenigstens aus zwei im Querschnitt E-förmigen Abschluß-Kernteilen (1.3) besteht, die mit ihren offenen Seiten gegeneinander weisen und zwischen welchen die Wicklungen (2,3) liegen.Transducer according to Claim 1 or one of the subsequent claims, characterized in that the magnetic core (1) consists of at least two end core parts (1.3) which are E-shaped in cross section and which face one another with their open sides and between which the windings (2, 3 ) lie. Wandler nach Anspruch 11, dadurch gekennzeichnet, daß in axialer Richtung zwischen die Abschluß-Kernteile (1.3) angepaßte Zwischen-Kernteile (1.1, 1.2) eingefügt sind.Transducer according to claim 11, characterized in that adapted intermediate core parts (1.1, 1.2) are inserted in the axial direction between the end core parts (1.3). Wandler nach Anspruch 12, dadurch gekennzeichnet, daß jeweils mehrere Zwischen-Kernteile (1.1, 1.2) in Achsrichtung aneinandergefügt sind.Transducer according to claim 12, characterized in that several intermediate core parts (1.1, 1.2) are joined together in the axial direction. Wandler nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die Scheibenspulen (2.1-2.5) an den axialen Stirnflächen Kontaktelemente (8) aufweisen, die bei axial aneinandergefügten Scheibenspulen paarweise in Kontaktanlage treten und eine elektrische Serienschaltung der benachbarten Scheibenspulen erzeugen.Transducer according to Claim 1 or one of the following, characterized in that the disc coils (2.1-2.5) have contact elements (8) on the axial end faces which come into contact in pairs when the disc coils are axially joined together and produce an electrical series connection of the adjacent disc coils.
EP94115707A 1993-11-11 1994-10-06 Transformer for medium voltage Expired - Lifetime EP0653767B1 (en)

Applications Claiming Priority (2)

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DE4338537A DE4338537A1 (en) 1993-11-11 1993-11-11 Inductive electrical converter for medium voltage
DE4338537 1993-11-11

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EP0653767B1 EP0653767B1 (en) 1998-01-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0755061A1 (en) * 1995-07-15 1997-01-22 Kommanditgesellschaft Ritz Messwandler GmbH &amp; Co. Single-pole voltage transformer
CN108183014A (en) * 2017-12-04 2018-06-19 国网河南省电力公司滑县供电公司 A kind of voltage transformer
CN108305768A (en) * 2018-03-14 2018-07-20 珠海市新化磁性材料有限公司 A kind of high voltage isolation transformer and preparation method thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19653827C1 (en) * 1996-12-21 1998-06-18 Vem Elektroantriebe Gmbh Device for pre-rinsing and generating overpressure in the area of the winding head of a rotating electrical high-voltage machine
EP3239997A1 (en) 2016-04-25 2017-11-01 ABB Schweiz AG A hv apparatus and a method of manufacturing such apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH240528A (en) * 1944-01-05 1945-12-31 Isaak Dr Goldstein Transformer, especially voltage converter, with an open iron core.
DE942823C (en) * 1954-04-16 1956-05-09 Koch & Sterzel Ag High-voltage transformer with taps on the high-voltage side
DE2108153A1 (en) * 1971-02-20 1972-08-31 Messwandler Bau Gmbh High-voltage test transformer of great power
FR2179250A1 (en) * 1972-04-07 1973-11-16 Stroemberg Oy Ab
FR2179805A1 (en) * 1972-04-04 1973-11-23 Osoboe K Bjuro Ins
JPS5297121A (en) * 1976-02-12 1977-08-15 Toshiba Corp Method of uniting tank and cover of electric apparatus
DE2843608A1 (en) 1978-10-06 1980-04-10 Raupach Friedrich TRANSFORMER, ESPECIALLY VOLTAGE CONVERTER OR TEST TRANSFORMER
DE3803846A1 (en) 1988-02-09 1989-08-17 Bernd Dipl Ing Sommer High-voltage test transformer having insulated core segments

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602855C (en) * 1930-12-05 1934-09-18 Koch & Sterzel Akt Ges Voltage converter with a bushing insulator
DE8014832U1 (en) * 1980-05-30 1980-08-28 Siemens Ag, 1000 Berlin Und 8000 Muenchen INDUCTIVE VOLTAGE CONVERTER FOR A FULLY INSULATED, METAL-ENCLOSED HIGH-VOLTAGE SWITCHGEAR

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH240528A (en) * 1944-01-05 1945-12-31 Isaak Dr Goldstein Transformer, especially voltage converter, with an open iron core.
DE942823C (en) * 1954-04-16 1956-05-09 Koch & Sterzel Ag High-voltage transformer with taps on the high-voltage side
DE2108153A1 (en) * 1971-02-20 1972-08-31 Messwandler Bau Gmbh High-voltage test transformer of great power
FR2179805A1 (en) * 1972-04-04 1973-11-23 Osoboe K Bjuro Ins
FR2179250A1 (en) * 1972-04-07 1973-11-16 Stroemberg Oy Ab
JPS5297121A (en) * 1976-02-12 1977-08-15 Toshiba Corp Method of uniting tank and cover of electric apparatus
DE2843608A1 (en) 1978-10-06 1980-04-10 Raupach Friedrich TRANSFORMER, ESPECIALLY VOLTAGE CONVERTER OR TEST TRANSFORMER
DE3803846A1 (en) 1988-02-09 1989-08-17 Bernd Dipl Ing Sommer High-voltage test transformer having insulated core segments

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1, no. 155 (E - 77) 12 December 1977 (1977-12-12) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0755061A1 (en) * 1995-07-15 1997-01-22 Kommanditgesellschaft Ritz Messwandler GmbH &amp; Co. Single-pole voltage transformer
CN108183014A (en) * 2017-12-04 2018-06-19 国网河南省电力公司滑县供电公司 A kind of voltage transformer
CN108305768A (en) * 2018-03-14 2018-07-20 珠海市新化磁性材料有限公司 A kind of high voltage isolation transformer and preparation method thereof

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DE59404942D1 (en) 1998-02-12
DE4338537A1 (en) 1995-05-18

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