EP0107013B1 - Choke having windings around core members made up of iron cores shaped as discs - Google Patents

Choke having windings around core members made up of iron cores shaped as discs Download PDF

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Publication number
EP0107013B1
EP0107013B1 EP83109084A EP83109084A EP0107013B1 EP 0107013 B1 EP0107013 B1 EP 0107013B1 EP 83109084 A EP83109084 A EP 83109084A EP 83109084 A EP83109084 A EP 83109084A EP 0107013 B1 EP0107013 B1 EP 0107013B1
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EP
European Patent Office
Prior art keywords
casing
choke
tension elements
iron core
yokes
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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.)
Expired
Application number
EP83109084A
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German (de)
French (fr)
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EP0107013A3 (en
EP0107013A2 (en
Inventor
Walter Dr. Dipl.-Ing. Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Transformatoren Union AG
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Transformatoren Union AG
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Publication date
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Priority to AT83109084T priority Critical patent/ATE24065T1/en
Publication of EP0107013A2 publication Critical patent/EP0107013A2/en
Publication of EP0107013A3 publication Critical patent/EP0107013A3/en
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Publication of EP0107013B1 publication Critical patent/EP0107013B1/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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together

Definitions

  • the invention relates to chokes for large electrical outputs with windings around core legs made of iron core disks stacked at intervals in the axial direction and with yokes arranged on the end face above and below the windings, which are fixed by the iron core disks axially penetrating metallic tension elements, the tension elements being made of high-strength steel and are dimensioned taking mechanical strength into account.
  • the upper and lower yokes in such chokes must be mechanically clamped together.
  • the yokes are supported by the core laminated core and inserts made of hard material in the gaps between the core laminated core arranged one above the other.
  • the oscillation amplitudes that occur due to the magnetic tensile forces at the interfaces of the core laminated cores are kept small by the clamping force.
  • Glass-fiber reinforced plastic rods or non-magnetic steel have been used as the material for the tension elements in the center of the alternating magnetic field.
  • the tension elements consist of steel and are electrically insulated by a sleeve made of insulating material.
  • the use of glass fiber reinforced plastic rods has the disadvantage that this material flows during its aging and the use of electrically insulated metallic bolts as a tension element allows only very low magnetic longitudinal field strengths with regard to the eddy current heating in the magnetic field.
  • the invention is therefore based on the object to provide tensioning the yokes of a choke with the associated core legs and windings, the core legs centrally penetrating rods that make full use of the achievable longitudinal field strengths in the core leg and at the same time the utilization of the mechanical strength of the other components, in particular the tie rods, guaranteed in an economical manner.
  • this object is achieved in that in the area of the iron core disks and the yokes are surrounded by a closed jacket made of material with very good electrical conductivity, for example made of copper or aluminum, which is designed such that the eddy currents generated in the jacket the magnetic field Reduce the inside of the tension element to a partial amount compared to the magnetic field to be expected without the jacket, which is just sufficient to maintain the eddy currents in the jacket and that the tension element is rectangular in cross section and the longer side of the cross section is parallel to the layer direction of the sheets in the yoke .
  • the tension element consists of a plurality of bands lying parallel to one another, each of which is encompassed by a jacket made of material with a very high electrical conductivity.
  • a particularly effective development of the invention consists in that the jacket of each tension element is wound from one or more axially parallel, electrically short-circuited coils made of foil-like sheet metal strip.
  • the electrical conductivity of the material for the jacket is at least 5 times, preferably more than 25 times, as large as that of the high-strength steel of the tension elements, and that the electrical conductivity of the high-strength steel is less than 2 rn / ⁇ - mm 2 .
  • Tension elements designed according to the invention with a jacket made of an electrically highly conductive material are very advantageous because they allow central tensioning for the yokes, which is arranged in the center of the core legs, at any magnetic alternating field strengths and thus also at any desired choke power ratings.
  • Windings 1 of a multi-phase choke each comprise a core leg made of iron core disks 2 stacked one above the other in the axial direction. Between each successive iron core disk 2 there is an intermediate layer 5 made of non-magnetic material with a very high modulus of elasticity, so that this core leg represents a rigid rigid column in itself.
  • the individual iron core disks 2 are assembled in a known manner from transformer sheet metal lamellae and, like the intermediate layers 5, have an axially parallel central opening.
  • yokes 3 rest on the end faces of the core legs formed by the iron core disks 2, which are preferably designed as straight beams and are likewise composed of transformer sheet metal lamellae. Over the in the iron core discs 2 and the intermediate layers 5 of the individual core legs before Breakthroughs seen are also provided in the two yokes 3, which are congruent with the former.
  • the openings in the yokes 3, the iron core disks 2 and the intermediate layers 5 are penetrated in the longitudinal direction for each core leg by a metallic tension element 4, which has nuts 8 at its ends, which, after being tightened via disks 7, form the iron core disks 2 and press the yokes 3 firmly together.
  • the intermediate layers 5 essentially serve to adjust the magnetic resistance of the iron circuit.
  • the heating in each of the tension elements 4 is negligibly small due to the remaining field.
  • the current coating in the jacket 6 and the required wall thickness thereof depend on the enclosed cross section.
  • Copper or aluminum whose electrical conductivity is 20 to 30 times as large as the electrical conductivity of a high-strength steel which is high-alloyed with nickel, chromium and / or molybdenum, are particularly suitable as the material for the jacket 6.
  • a corrosion-neutral film for example with paper.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Windings For Motors And Generators (AREA)

Abstract

1. A choke for large electric outputs having windings (1) round core flanks made of axially aligned and spaced iron core discs (2) and with yokes (3) which are arranged at the ends above and below the windings and which are fixed by metallic tension elements (4) which coaxially penetrate the iron core discs (2), where said tension elements (4) are made of a high-tensile steel and exclusively dimensioned by taking into consideration the mechanical stress, characterised in that, in the region of the iron core discs (2) and the yokes (3), the tension elements (4) are surrounded by a sealed casing (6) consisting of a material of high electrical conductivity, e. g. of copper or aluminium, which is contrived to be such that the eddy currents produced in the casing (6) reduce the magnetic field inside the tension elements (4) in relation to the magnetic field, which is to be expected without a casing, to a partial amount which is just sufficient in order to maintain the eddy currents in the casing (6) and that the tension element (4) has a rectangular cross-section and the longer sides of the cross-section are arranged to be parallel to the layer direction of the sheets in the yoke (3).

Description

Die Erfindung betrifft Drosseln für große elektrische Leistungen mit Wicklungen um Kernschenkel aus in Achsrichtung mit Abständen übereinandergestapelten Eisenkernscheiben und mit stirnseitig über und unter den Wicklungen angeordneten Jochen, die durch die Eisenkernscheiben achsmittig durchsetzende, metallische Zugelemente fixiert sind, wobei die Zugelemente aus hochfestem Stahl hergestellt und ausschließlich unter Berücksichtigung der mechanischen Festigkeit dimensioniert sind.The invention relates to chokes for large electrical outputs with windings around core legs made of iron core disks stacked at intervals in the axial direction and with yokes arranged on the end face above and below the windings, which are fixed by the iron core disks axially penetrating metallic tension elements, the tension elements being made of high-strength steel and are dimensioned taking mechanical strength into account.

Mit Rücksicht auf die Reduzierung von magnetisch bedingten Geräuschen müssen das obere und das untere Joch bei derartigen Drosseln mechanisch miteinander verspannt sein. Die Abstützung der Joche erfolgt dabei über die Kernblechpakete und über Beilagen aus hartem Werkstoff in den Spalten zwischen übereinander angeordneten Kernblechpaketen. Durch die Spannkraft werden die durch die magnetischen Zugkräfte an den Grenzflächen der Kernblechpakete auftretenden Schwingungsamplituden klein gehalten.With regard to the reduction of magnetically induced noises, the upper and lower yokes in such chokes must be mechanically clamped together. The yokes are supported by the core laminated core and inserts made of hard material in the gaps between the core laminated core arranged one above the other. The oscillation amplitudes that occur due to the magnetic tensile forces at the interfaces of the core laminated cores are kept small by the clamping force.

Für die Verspannung der Joche sind unterschiedliche Anordnungen bekannt. Beispielsweise ist durch die US-Patentschrift 2 909 742 eine Anordnung bekannt, bei der im Zentrum jedes Kernschenkels ein mechanisches Zugelement vorgesehen ist, das die Joche durchstößt und über verhältnismäßig einfache stern- oder scheibenförmige Verbindungselemente die Zugkraft auf die Joche überträgt.Different arrangements are known for bracing the yokes. For example, an arrangement is known from US Pat. No. 2,909,742 in which a mechanical tension element is provided in the center of each core leg, which pushes through the yokes and transmits the tension force to the yokes via relatively simple star-shaped or disk-shaped connecting elements.

Als Werkstoff für die im Zentrum des magnetischen Wechselfeldes liegenden Zugelemente sind glasfaserverstärkte Kunststoffstangen oder unmagnetischer Stahl verwendet worden. Bei der vorgenannten bekannten Anordnung bestehen die Zugelemente aus Stahl und sind durch eine Muffe aus Isolierwerkstoff elektrisch isoliert. Der Einsatz von glasfaserverstärkten Kunststoffstangen hat den Nachteil, daß dieser Werkstoff während seiner Alterung fließt und der Einsatz von elektrisch isolierten metallischen Bolzen als Zugelement läßt mit Rücksicht auf die Wirbelstromerwärmung im Magnetfeld nur sehr niedrige magnetische Längsfeldstärken zu.Glass-fiber reinforced plastic rods or non-magnetic steel have been used as the material for the tension elements in the center of the alternating magnetic field. In the aforementioned known arrangement, the tension elements consist of steel and are electrically insulated by a sleeve made of insulating material. The use of glass fiber reinforced plastic rods has the disadvantage that this material flows during its aging and the use of electrically insulated metallic bolts as a tension element allows only very low magnetic longitudinal field strengths with regard to the eddy current heating in the magnetic field.

Der Erfindung liegt daher die Aufgabe zugrunde, für die Verspannung der Joche einer Drossel mit den zugehörigen Kernschenkein und Wicklungen die Kernschenkel zentral durchsetzende Zugstangen zu schaffen, die die volle Ausnutzung der erreichbaren Längsfeldstärken im Kernschenkel und gleichzeitig die Ausnutzung der mechanischen Festigkeit der übrigen Bauteile, insbesondere der Zugstangen, auf wirtschaftliche Art und Weise gewährleistet.The invention is therefore based on the object to provide tensioning the yokes of a choke with the associated core legs and windings, the core legs centrally penetrating rods that make full use of the achievable longitudinal field strengths in the core leg and at the same time the utilization of the mechanical strength of the other components, in particular the tie rods, guaranteed in an economical manner.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß im Bereich der Eisenkernscheiben und der Joche von einem geschlossenen Mantel aus Werkstoff mit sehr guter elektrischer Leitfähigkeit, beispielsweise aus Kupfer oder Aluminium, umgeben sind, der derart ausgeführt ist, daß die in dem Mantel erzeugten Wirbelströme das Magnetfeld im Inneren des Zugelementes gegenüber dem ohne Mantel zu erwartenden Magnetfeld auf einen Teilbetrag reduzieren, der gerade ausreicht, um die Wirbelströme im Mantel aufrecht zu erhalten und daß das Zugelement im Querschnitt rechteckig ist und die längere Seite des Querschnitts parallel zur Schichtrichtung der Bleche im Joch liegt.According to the invention this object is achieved in that in the area of the iron core disks and the yokes are surrounded by a closed jacket made of material with very good electrical conductivity, for example made of copper or aluminum, which is designed such that the eddy currents generated in the jacket the magnetic field Reduce the inside of the tension element to a partial amount compared to the magnetic field to be expected without the jacket, which is just sufficient to maintain the eddy currents in the jacket and that the tension element is rectangular in cross section and the longer side of the cross section is parallel to the layer direction of the sheets in the yoke .

Nach zweckmäßigen Weiterbildungen der Erfindung besteht das Zugelement aus mehreren parallel aneinanderliegenden Bändern, von denen jedes für sich von einem Mantel aus Werkstoff mit sehr hoher elektrischer Leitfähigkeit umfaßt ist.According to expedient developments of the invention, the tension element consists of a plurality of bands lying parallel to one another, each of which is encompassed by a jacket made of material with a very high electrical conductivity.

Eine besonders wirksame Weiterbildung der Erfindung besteht darin, daß der Mantel jedes Zugelementes aus einer oder aus mehreren axial parallelen, elektrisch kurzgeschlossenen Spulen aus folienartigem Blechband gewickelt ist.A particularly effective development of the invention consists in that the jacket of each tension element is wound from one or more axially parallel, electrically short-circuited coils made of foil-like sheet metal strip.

Nach vorteilhaften Ausgestaltungen der Erfindung ist vorgesehen, daß die elektrische Leitfähigkeit des Werkstoffes für den Mantel mindestens 5-mal, vorzugsweise mehr als 25-mal, so groß ist wie die des hochfesten Stahles der Zugelemente, und daß die elektrische Leitfähigkeit des hochfesten Stahles kleiner als 2 rn/Ω - mm2 ist.According to advantageous embodiments of the invention it is provided that the electrical conductivity of the material for the jacket is at least 5 times, preferably more than 25 times, as large as that of the high-strength steel of the tension elements, and that the electrical conductivity of the high-strength steel is less than 2 rn / Ω - mm 2 .

Erfindungsgemäß gestaltete Zugelemente mit einem Mantel aus elektrisch sehr gut leitendem Werkstoff sind sehr vorteilhaft, weil sie eine achsmittig in den Kernschenkeln angeordnete Zentralverspannung für die Joche bei beliebig hohen magnetischen Wechselfeldstärken und damit auch bei beliebig hohen Drosselnennleistungen erlauben.Tension elements designed according to the invention with a jacket made of an electrically highly conductive material are very advantageous because they allow central tensioning for the yokes, which is arranged in the center of the core legs, at any magnetic alternating field strengths and thus also at any desired choke power ratings.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert, wobei in der Zeichnung ein Längsschnitt durch eine Drossel mit erfindungsgemäß von einem Mantel umgebenen Zugelement in den Kernschenkein dargestellt ist.An embodiment of the invention is explained in more detail with reference to a drawing, wherein the drawing shows a longitudinal section through a throttle with a tension element according to the invention surrounded by a jacket in the core leg.

Wicklungen 1 einer mehrphasigen Drossel umfassen jeweils einen Kernschenkel aus in Achsrichtung übereinandergestapelten Eisenkernscheiben 2. Zwischen jeweils aufeinanderfolgenden Eisenkernscheiben 2 ist je eine Zwischenlage 5 aus unmagnetischem Werkstoff mit sehr hohem Elastizitätsmodul angeordnet, so daß dieser Kernschenkel für sich eine starre feste Säule darstellt. Die einzelnen Eisenkernscheiben 2 sind in bekannter Weise aus Transformatorblechlamellen zusammengesetzt und weisen ebenso, wie die Zwischenlagen 5, einen achsparallelen zentralen Durchbruch auf.Windings 1 of a multi-phase choke each comprise a core leg made of iron core disks 2 stacked one above the other in the axial direction. Between each successive iron core disk 2 there is an intermediate layer 5 made of non-magnetic material with a very high modulus of elasticity, so that this core leg represents a rigid rigid column in itself. The individual iron core disks 2 are assembled in a known manner from transformer sheet metal lamellae and, like the intermediate layers 5, have an axially parallel central opening.

Unter Zwischenschaltung von weiteren Zwischenlagen 5 liegen auf den Stirnflächen der von den Eisenkernscheiben 2 gebildeten Kernschenkel Joche 3 auf, die vorzugsweise als gerade Balken gestaltet sind und ebenfalls aus Transformatorblechlamellen zusammengesetzt sind. Über den in den Eisenkernscheiben 2 und den Zwischenlagen 5 der einzelnen Kernschenkel vorgesehenen Durchbrüchen sind in den beiden Jochen 3 ebenfalls Durchbrüche vorgesehen, die mit den erstgenannten deckungsgleich sind.With the interposition of further intermediate layers 5, yokes 3 rest on the end faces of the core legs formed by the iron core disks 2, which are preferably designed as straight beams and are likewise composed of transformer sheet metal lamellae. Over the in the iron core discs 2 and the intermediate layers 5 of the individual core legs before Breakthroughs seen are also provided in the two yokes 3, which are congruent with the former.

Die Durchbrüche in den Jochen 3, den Eisenkernscheiben 2 und den Zwischenlagen 5 werden je Kernschenkel von einem metallischen Zugelement 4 in Längsrichtung durchsetzt, das an seinen Enden Muttern 8 trägt, die nach ihrem Anziehen über Scheiben 7 die den Eisenkreis der Drossel bildenden Eisenkernscheiben 2 und die Joche 3 fest aufeinanderpressen. Die Zwischenlagen 5 dienen in dieser Anordnung im wesentlichen zur Einstellung des magnetischen Widerstandes des Eisenkreises.The openings in the yokes 3, the iron core disks 2 and the intermediate layers 5 are penetrated in the longitudinal direction for each core leg by a metallic tension element 4, which has nuts 8 at its ends, which, after being tightened via disks 7, form the iron core disks 2 and press the yokes 3 firmly together. In this arrangement, the intermediate layers 5 essentially serve to adjust the magnetic resistance of the iron circuit.

Zur Abschirmung der in den Jochen 3 sowie den Eisenkernscheiben 2 durch die Wicklungen 1 erzeugten sehr hohen magnetischen Wechselfeldstärke von den metallischen Zugelementen 4 sind diese im Bereich der Eisenkernscheiben 2 und der Joche 3 praktisch lückenlos von je einem Mantel 6 aus elektrisch sehr gut leitendem Werkstoff umgeben. Die im Mantel 6 an jeder Stelle Messenden Wirbelströme reduzieren das Magnetfeld im Innenraum des Mantels 6 auf einen Teilbetrag, der gerade ausreicht, um die Wirbelströme im Mantel 6 aufrecht zu erhalten.In order to shield the very high magnetic alternating field strength generated in the yokes 3 and the iron core disks 2 by the windings 1 from the metallic tensile elements 4, these are practically completely surrounded in the area of the iron core disks 2 and the yokes 3 by a jacket 6 each made of an electrically highly conductive material . The eddy currents measuring in the jacket 6 at every point reduce the magnetic field in the interior of the jacket 6 to a partial amount which is just sufficient to maintain the eddy currents in the jacket 6.

Durch die Herstellung der Zugelemente 4 aus hochlegiertem, hochfestem Stahl mit gegenüber der elektrischen Leitfähigkeit des Mantels 6 wesentlich niedrigerer elektrischer Leitfähigkeit ist die Erwärmung in jedem einzelnen der Zugelemente 4 durch das verbleibende Restfeld vernachlässigbar klein. Dabei ist der Strombelag in dem Mantel 6 und die erforderliche Wandstärke desselben von dem umschlossenen Querschnitt abhängig. Bei einer Unterteilung des Zugelementes 4 in ein Bündel von parallelen Bändern ist es deshalb vorteilhaft, jedes einzelne der Bänder mit einem eigenen Mantel 6 mit entsprechend kleiner Wandstärke zu umgeben.By producing the tension elements 4 from high-alloy, high-strength steel with a significantly lower electrical conductivity than the electrical conductivity of the jacket 6, the heating in each of the tension elements 4 is negligibly small due to the remaining field. The current coating in the jacket 6 and the required wall thickness thereof depend on the enclosed cross section. When dividing the tension element 4 into a bundle of parallel bands, it is therefore advantageous to surround each of the bands with its own jacket 6 with a correspondingly small wall thickness.

Als Werkstoff für den Mantel 6 eignen sich insbesondere Kupfer oder Aluminium, deren elektrische Leitfähigkeit 20- bis 30-mal so groß ist wie die elektrische Leitfähigkeit eines hochfesten mit Nickel, Chrom und/oder Molybdän hochlegierten Stahles. Zur Verhinderung von Korrosion zwischen den unterschiedlichen Metallen ist es häufig zweckmäßig, die Berührungsflächen der Zugelemente 4 und des jeweils zugehörigen Mantels 6 galvanisch zu behandeln oder mit einer korrosionsneutralen Folie, beispielsweise mit Papier, abzudecken.Copper or aluminum, whose electrical conductivity is 20 to 30 times as large as the electrical conductivity of a high-strength steel which is high-alloyed with nickel, chromium and / or molybdenum, are particularly suitable as the material for the jacket 6. To prevent corrosion between the different metals, it is often expedient to treat the contact surfaces of the tension elements 4 and the associated jacket 6 galvanically or to cover them with a corrosion-neutral film, for example with paper.

Claims (5)

1. A choke for large electric outputs having windings (1) round core flanks made of axially aligned and spaced iron core discs (2) and with yokes (3) which are arranged at the ends above and below the windings and which are fixed by metallic tension elements (4) which coaxially penetrate the iron core discs (2), where said tension elements (4) are made of a high-tensile steel and exclusively dimensioned by taking into consideration the mechanical stress, characterised in
that, in the region of the iron core discs (2) and the yokes (3), the tension elements (4) are surrounded by a sealed casing (6) consisting of a material of high electrical conductivity, e. g. of copper or aluminium, which is contrived to be such that the eddy currents produced in the casing (6) reduce the magnetic field inside the tension elements (4) in relation to the magnetic field, which is to be expected without a casing, to a partial amount which is just sufficient in order to maintain the eddy currents in the casing (6) and
that the tension element (4) has a rectangular cross-section and the longer sides of the cross-section are arranged to be parallel to the layer direction of the sheets in the yoke (3).
2. A choke as claimed in claim 1, characterised in that the tension element (4) consists of a plurality of strips which are joined in parallel and each of which is individually surrounded by a casing (6) made of a material of extremely high electrical conductivity.
3. A choke as claimed in claim 1 or claim 2, characterised in that the casing (6) of each tension element (4) is wound from one or more axially parallel, electrically short-circuited coils consisting of a foil-like sheet metal strip.
4. A choke as claimed in one of the preceding claims 1 to 3, characterised in that the electrical conductivity of the casing material is at least 5 times, preferably more than 25 times as great as that of the high-tensile steel of the tension elements (4).
5. A choke as claimed in one of the preceding claims 1 to 4, characterised in that the electrical conductivity of the high-tensile steel is less than 2 rn/Ω · mm2.
EP83109084A 1982-09-29 1983-09-14 Choke having windings around core members made up of iron cores shaped as discs Expired EP0107013B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83109084T ATE24065T1 (en) 1982-09-29 1983-09-14 CHOKE WITH WINDINGS AROUND IRON CORE DISKS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823236117 DE3236117A1 (en) 1982-09-29 1982-09-29 THROTTLE WITH WINDINGS AROUND CORE LEGS FROM IRON CORE DISCS
DE3236117 1982-09-29

Publications (3)

Publication Number Publication Date
EP0107013A2 EP0107013A2 (en) 1984-05-02
EP0107013A3 EP0107013A3 (en) 1984-07-04
EP0107013B1 true EP0107013B1 (en) 1986-12-03

Family

ID=6174498

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109084A Expired EP0107013B1 (en) 1982-09-29 1983-09-14 Choke having windings around core members made up of iron cores shaped as discs

Country Status (5)

Country Link
EP (1) EP0107013B1 (en)
AT (1) ATE24065T1 (en)
BR (1) BR8305296A (en)
CA (1) CA1211170A (en)
DE (2) DE3236117A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3413359A1 (en) * 1984-04-09 1985-10-17 Transformatoren Union Ag, 7000 Stuttgart Inductor having windings around iron-core limbs composed of iron-core discs
AT390690B (en) * 1987-12-04 1990-06-11 Elin Union Ag Iron-core limb for electrical inductors

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB691142A (en) * 1900-01-01
DE1145717B (en) * 1961-04-12 1963-03-21 Licentia Gmbh Core made of cold-rolled sheet metal for three-phase power transformers and reactors
DE2436067A1 (en) * 1974-07-26 1976-02-05 Waasner B Laminated transformer core with non-inductive clamping bolt - has gap in core region surrounding its bore for clamping bolt
DE2544493A1 (en) * 1975-10-04 1977-04-14 Bbc Brown Boveri & Cie Multiphase compensation choke coil - with column element and ceramic spacers held between wrapped strip yokes, and PTFE foil inserted between yoke and adjacent element
SE413716B (en) * 1978-05-02 1980-06-16 Asea Ab POWER TRANSFORMER OR REACTOR

Also Published As

Publication number Publication date
BR8305296A (en) 1984-05-02
CA1211170A (en) 1986-09-09
DE3368145D1 (en) 1987-01-15
EP0107013A3 (en) 1984-07-04
DE3236117A1 (en) 1984-03-29
ATE24065T1 (en) 1986-12-15
EP0107013A2 (en) 1984-05-02

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