EP0048384B1 - Winding for dry-type transformers - Google Patents

Winding for dry-type transformers Download PDF

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Publication number
EP0048384B1
EP0048384B1 EP81107042A EP81107042A EP0048384B1 EP 0048384 B1 EP0048384 B1 EP 0048384B1 EP 81107042 A EP81107042 A EP 81107042A EP 81107042 A EP81107042 A EP 81107042A EP 0048384 B1 EP0048384 B1 EP 0048384B1
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EP
European Patent Office
Prior art keywords
winding
strip
synthetic resin
wound
conductor
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.)
Expired
Application number
EP81107042A
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German (de)
French (fr)
Other versions
EP0048384A1 (en
Inventor
Richard Dr. Pfeiffer
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Transformatoren Union AG filed Critical Transformatoren Union AG
Priority to AT81107042T priority Critical patent/ATE7250T1/en
Publication of EP0048384A1 publication Critical patent/EP0048384A1/en
Application granted granted Critical
Publication of EP0048384B1 publication Critical patent/EP0048384B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating

Definitions

  • the invention relates to a winding for dry-type transformers with windings provided in radially superposed layers made of a bare metallic winding conductor in a solid, cast-body-like block made of synthetic resin.
  • Cast resin transformers known from DE-A-2 246 235 have recently been used as dry-type transformers. With these transformers, the windings are cast in compact cast resin blocks and meet practically all loads that occur with regard to electrical and mechanical stress. The noise damping is also very cheaply solved for these transformers by means of a resilient clamping. With increasing absolute dimensions and decreasing number of pieces per nominal output, however, economical production is no longer guaranteed in this way, since in particular the costs for the casting mold have to be apportioned to an insufficient number of pieces. In addition, in the case of larger dimensions, such as are required for transformers with a nominal output of more than 1000 KVA, the relatively large absolute dimensions cause shrinkage problems in the synthetic resin layers.
  • the object of the invention is therefore to provide a winding for dry-type transformers which meets all electrical and mechanical requirements and which, owing to its construction, can be easily produced in a wide variety of dimensions on simple devices with little effort.
  • this object is achieved for windings of the type mentioned at the outset in that the bare winding conductor is introduced into the winding assembly in parallel and together with at least one dry strip of insulating material impregnated with synthetic resin, in that at least one strip is folded at least twice parallel to the winding conductor in that an inner winding cylinder, layer insulation and an outer winding cylinder are also wound from the dry strip impregnated with synthetic resin and that the turns of the bare winding conductor and the strips of insulating material are baked into a block by the synthetic resin cured after impregnation of the winding process.
  • DE-A-2 924 191 proposes to solve this problem alternately a void-free layer of a slurry of insulating material which is viscous during the winding process and a layer of the winding are applied alternately to an inner supporting cylinder made of insulating material, the individual turns of the layers of the Winding can be pressed into the soft layer radially below them by adjusting the winding tension accordingly.
  • the disadvantage of this solution is that, among other things, toxic and environmentally harmful liquid substances are to be used, the processing of which is associated with considerable restrictions and requirements.
  • a strip of fabric is stretchable at least in the longitudinal direction, the individual threads of which lie obliquely to the longitudinal direction, and a winding of a synthetic resin strand which is approximately the same as the winding conductor is wrapped in front of both ends of each layer.
  • the ends of the winding conductor are galvanically connected with connecting plates which protrude outwards into the outer winding cylinder.
  • the curing temperature of the synthetic resin is equal to the temperature resistance of the strip and that the folded strip is folded in opposite directions at a distance from the winding conductor height and is Z-shaped in cross section.
  • the winding according to the invention is very advantageous because it can be produced in a simple and harmless manner and, moreover, is able to withstand all the forces which occur on and in the winding during assembly and operation.
  • the creation of the winding according to the invention is also economical because no complex shapes and only relatively short set-up times are required for this.
  • An inner winding cylinder 2 made of strips 3 is arranged around an axis 1.
  • the strips 3 are made of insulating material and additionally impregnated with synthetic resin. However, they are dry at room temperature.
  • a layer 4 of a winding conductor 8 with a bright metallic surface is wound onto the inner winding cylinder 2.
  • this winding conductor 8 lies in the lower angle of a strip 3 bent to a Z-shape in cross section.
  • Each layer of the winding conductor 8 is followed by a layer insulation 5 also made of strips 3.
  • the layer insulation 5 serves in a known manner as a base for the following layer 4.
  • connection plates 9 which are preferably wrapped between the uppermost layer 4 and an outer winding cylinder 6.
  • the bolt 10 is guided outward in approximately the radial direction.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

1. A winding for dry transformers having turns, which consist of a wound conductor (8) made of bare metal and are arranged in radially superimposed layers in a massive block which resembles a cast body and consists of synthetic resin, characterised in - that the bare wound conductor (8) is introduced into the winding assembly parallel and together with at least one dry strip (3) which consists of an insulating material and is impregnated with synthetic resin ; - that at least one strip (3) is folded parallel to the wound conductor (8) at least twice ; - that an inner wound cylinder (2), layer insulations (5) and an outer wound cylinder (6) are likewise wound from the dry strip (3) impregnated with synthetic resin ; and - that the turns consisting of the bare wound conductor (8) and the strips (3) consisting of an insulating material, are bound together to form a block by means of the synthetic resin which is introduced as an impregnation and which has hardened after the termination of the winding process.

Description

Die Erfindung betrifft eine Wicklung für Trockentransformatoren mit in radial übereinander angeordneten Lagen vorgesehenen Windungen aus einem metallischen blanken Wickelleiter in einem massiven, gußkörperähnlichen Block aus Kunstharz.The invention relates to a winding for dry-type transformers with windings provided in radially superposed layers made of a bare metallic winding conductor in a solid, cast-body-like block made of synthetic resin.

In neuerer Zeit werden als Trockentransformatoren beispielsweise durch die DE-A-2 246 235 bekannte Gießharztransformatoren eingesetzt. Bei diesen Transformatoren sind die Wicklungen in kompakte Gießharzblöcke eingegossen und erfüllen praktisch alle hinsichtlich der elektrischen und mechanischen Beanspruchung auftretenden Belastungen. Auch die Geräuschdämpfung ist für diese Transformatoren durch eine federnde Einspannung sehr günstig gelöst. Mit wachsenden absoluten Abmessungen und sinkender Stückzahl je Nennleistung ist jedoch auf diese Art eine wirtschaftliche Fertigung nicht mehr gewährleistet, da insbesondere die Kosten für die Gießform auf eine zu kleine Stückzahl umgelegt werden muß. Darüber hinaus treten bei größeren Abmessungen, wie sie bei Transformatoren mit Nennleistungen über 1000 KVA erforderlich werden, durch die verhältnismäßig großen absoluten Abmessungen Schrumpfungsprobleme in den Kunstharzschichten auf.Cast resin transformers known from DE-A-2 246 235 have recently been used as dry-type transformers. With these transformers, the windings are cast in compact cast resin blocks and meet practically all loads that occur with regard to electrical and mechanical stress. The noise damping is also very cheaply solved for these transformers by means of a resilient clamping. With increasing absolute dimensions and decreasing number of pieces per nominal output, however, economical production is no longer guaranteed in this way, since in particular the costs for the casting mold have to be apportioned to an insufficient number of pieces. In addition, in the case of larger dimensions, such as are required for transformers with a nominal output of more than 1000 KVA, the relatively large absolute dimensions cause shrinkage problems in the synthetic resin layers.

Der Erfindung liegt daher die Aufgabe zugrunde, für Trockentransformatoren eine allen elektrischen und mechanischen Anforderungen genügende Wicklung zu schaffen, die aufgrund ihres Aufbaues mit geringem Aufwand auf einfache Weise in verschiedensten Abmessungen auf einfachen Vorrichtungen herstellbar ist.The object of the invention is therefore to provide a winding for dry-type transformers which meets all electrical and mechanical requirements and which, owing to its construction, can be easily produced in a wide variety of dimensions on simple devices with little effort.

Erfindungsgemäß wird diese Aufgabe für Wicklungen der eingangs genannten Art dadurch gelöst, daß der blanke Wickelleiter parallel und zusammen mit mindestens einem mit Kunstharz getränkten trockenen Streifen aus Isolierwerkstoff in den Wicklungsverband eingebracht ist, daß mindestens ein Streifen parallel zu dem Wickelleiter mindestens zweimal abgekantet ist, daß ein innerer Wickelzylinder, Lagenisolation und ein äußerer Wickelzylinder ebenfalls aus dem mit Kunstharz getränkten trockenen Streifen gewickelt sind und daß die Windungen aus dem blanken Wickelleiter und der Streifen aus Isolierwerkstoff durch das als Tränkung eingebrachte nach Abschluß des Wickelvorganges ausgehärtete Kunstharz zu einem Block verbacken sind.According to the invention, this object is achieved for windings of the type mentioned at the outset in that the bare winding conductor is introduced into the winding assembly in parallel and together with at least one dry strip of insulating material impregnated with synthetic resin, in that at least one strip is folded at least twice parallel to the winding conductor in that an inner winding cylinder, layer insulation and an outer winding cylinder are also wound from the dry strip impregnated with synthetic resin and that the turns of the bare winding conductor and the strips of insulating material are baked into a block by the synthetic resin cured after impregnation of the winding process.

Durch die DE-A-2 924 191 ist zur Lösung dieser Aufgabe vorgeschlagen auf einen inneren Tragzylinder aus Isolierwerkstoff abwechselnd je eine lunkerfreie Schicht aus einem während des Wickelvorganges zähflüssigen Brei eines Isolierwerkstoffes und je eine Lage der Wicklung aufzubringen, wobei die einzelnen Windungen der Lagen der Wicklung durch entsprechende Einstellung des Wickelzuges in die jeweils radial unter ihnen liegende weiche Schicht hineingedrückt werden. Nachteilig ist bei dieser Lösung das unter anderem giftige und umweltschädliche flüssige Stoffe einzusetzen sind, deren Verarbeitung mit erheblichen Einschränkungen und Auflagen verbunden ist.DE-A-2 924 191 proposes to solve this problem alternately a void-free layer of a slurry of insulating material which is viscous during the winding process and a layer of the winding are applied alternately to an inner supporting cylinder made of insulating material, the individual turns of the layers of the Winding can be pressed into the soft layer radially below them by adjusting the winding tension accordingly. The disadvantage of this solution is that, among other things, toxic and environmentally harmful liquid substances are to be used, the processing of which is associated with considerable restrictions and requirements.

Durch die DE-A-2402149 ist zwar für die Verwendung in Drilleitern ein bindemittelimprägnierter, trockener Träger bekannt, der jedoch nur zusammen mit Isolierpapier oder Kunststoffolie einsetzbar ist. Diese bekannte Drilleiterausführung verleiht dem Drilleiter in der fertigen Wicklung annähernd die mechanischen Eigenschaften eines massiven Leiters. Für die Gestaltung der Wicklung als solcher gibt diese Drilleiterausführung jedoch keinerlei Hinweise.From DE-A-2402149 a binder-impregnated, dry carrier is known for use in twist conductors, but can only be used together with insulating paper or plastic film. This known stranded conductor design gives the stranded conductor approximately the mechanical properties of a solid conductor in the finished winding. For the design of the winding as such, however, this twisted pair version does not provide any information.

Nach zweckmäßigen Weiterbildungen der erfindungsgemäßen Wicklung dient als Streifen ein mindestens in Längsrichtung dehnbares Gewebeband, dessen Einzelfäden schräg zur Längsrichtung liegen und ist vor beiden Enden jeder Lage eine Windung aus einem im Querschnitt etwa dem Wickelleiter gleichen Strang aus Kunstharz eingewickelt. Die Enden des Wickelleiters sind galvanisch mit nach außen vorstehenden Bolzen in den äußeren Wickelzylinder eingebackenen Anschlußplatten verbunden.According to expedient developments of the winding according to the invention, a strip of fabric is stretchable at least in the longitudinal direction, the individual threads of which lie obliquely to the longitudinal direction, and a winding of a synthetic resin strand which is approximately the same as the winding conductor is wrapped in front of both ends of each layer. The ends of the winding conductor are galvanically connected with connecting plates which protrude outwards into the outer winding cylinder.

Nach vorteilhaften Ausgestaltungen der Erfindung ist vorgesehen, daß die Aushärtetemperatur des Kunstharzes gleich der Temperaturfestigkeit des Streifens ist und daß der abgekantete Streifen im Abstand der Wickelleiterhöhe in einander entgegengesetztem Sinn abgekantet und im Querschnitt Z-förmig ist.According to advantageous embodiments of the invention, it is provided that the curing temperature of the synthetic resin is equal to the temperature resistance of the strip and that the folded strip is folded in opposite directions at a distance from the winding conductor height and is Z-shaped in cross section.

Die erfindungsgemäße Wicklung ist sehr vorteilhaft, denn sie ist auf einfache und ungefährliche Art und Weise herstellbar und ist darüber hinaus allen bei der Montage und im Betrieb an und in der Wicklung auftretenden Kräften gewachsen. Darüber hinaus ist die Erstellung der erfindungsgemäßen Wicklung auch wirtschaftlich, weil hierzu keine aufwendigen Formen und nur verhältnismäßig geringe Rüstzeiten erforderlich sind.The winding according to the invention is very advantageous because it can be produced in a simple and harmless manner and, moreover, is able to withstand all the forces which occur on and in the winding during assembly and operation. In addition, the creation of the winding according to the invention is also economical because no complex shapes and only relatively short set-up times are required for this.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert.

  • Fig. 1 zeigt einen achsparallelen Schnitt durch eine erfindungsgemäße Wicklung mit Z-förmig abgekanteten Streifen und
  • Fig. 2 eine erfindungsgemäße Wicklung mit U-förmig abgekanteten Streifen;
  • Fig. 3 ist die perspektivische Ansicht einer Wicklungsstirnseite in kleinerem Maßstab.
An embodiment of the invention is explained in more detail with reference to a drawing.
  • Fig. 1 shows an axially parallel section through a winding according to the invention with Z-shaped strips and
  • 2 shows a winding according to the invention with a U-shaped folded strip;
  • Fig. 3 is a perspective view of a winding face on a smaller scale.

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

Um eine Achse 1 ist ein innerer Wickelzylinder 2 aus Streifen 3 angeordnet. Die Streifen 3 sind aus Isolierwerkstoff und zusätzlich mit Kunstharz getränkt. Sie sind jedoch bei Raumtemperatur trocken.An inner winding cylinder 2 made of strips 3 is arranged around an axis 1. The strips 3 are made of insulating material and additionally impregnated with synthetic resin. However, they are dry at room temperature.

Auf den inneren Wickelzylinder 2 ist eine Lage 4 eines Wickelleiters 8 mit metallisch blanker Oberfläche aufgewickelt. Bei der Anordnung gemäß Fig. 1 legt sich dieser Wickelleiter 8 beim Auflaufen auf die Wicklung in den unteren Winkel eines zu einem im Querschnitt Z-förmig abgekanteten Streifens 3.A layer 4 of a winding conductor 8 with a bright metallic surface is wound onto the inner winding cylinder 2. When arranging 1, when winding onto the winding, this winding conductor 8 lies in the lower angle of a strip 3 bent to a Z-shape in cross section.

Auf jede Lage der Wickelleiter 8 folgt eine Lagenisolation 5 ebenfalls aus Streifen 3. Die Lagenisolation 5 dient in bekannter Weise als Unterlage für die jeweils folgende Lage 4. Zur Verbesserung der mechanischen Festigkeit des Wickelkörpers gemäß Fig. 1 ist in jeder Lage 4 an beiden Enden je ein Strang 11 aus Kunstharz mit eingewickelt.Each layer of the winding conductor 8 is followed by a layer insulation 5 also made of strips 3. The layer insulation 5 serves in a known manner as a base for the following layer 4. To improve the mechanical strength of the winding body according to FIG. 1, there is 4 at both ends in each layer one strand 11 of synthetic resin is also wrapped.

Die Enden 7 des Wickelleiters 8 sind von innen galvanisch mit Bolzen 10 in Anschlußplatten 9 verbunden, die vorzugsweise zwischen die oberste Lage 4 und einen äußeren Wickelzylinder 6 mit eingewickelt sind. Dabei ist der Bolzen 10 in etwa in radialer Richtung nach außen geführt.The ends 7 of the winding conductor 8 are galvanically connected from the inside with bolts 10 in connection plates 9, which are preferably wrapped between the uppermost layer 4 and an outer winding cylinder 6. The bolt 10 is guided outward in approximately the radial direction.

Bei der Wicklung gemäß Fig. 2 sind anstelle von im Querschnitt Z-förmig aufgebauten Streifen 3 U-förmige Streifen gleichzeitig mit dem Wickelleiter 8 in den Wicklungsverband eingebracht. Auch hierbei liegt die unterste Lage 4 auf einem inneren Wickelzylinder 2 und sind zwischen aufeianderfolgenden Lagen Isolationen 5 vorgesehen. Der innere Wickelzylinder 2, die Lagenisolation 5 und ein ebenfalls angebrachter äußerer Wickelzylinder 6 sind wie bei der Anordnung gemäß Fig. 1 von mit Kunstharz getränkten Streifen 3 aus Isolierwerkstoff dargestellt.In the winding according to FIG. 2, instead of strips having a Z-shaped cross section, 3 U-shaped strips are introduced into the winding assembly simultaneously with the winding conductor 8. Here, too, the lowermost layer 4 lies on an inner winding cylinder 2 and insulations 5 are provided between successive layers. The inner winding cylinder 2, the layer insulation 5 and a likewise attached outer winding cylinder 6 are shown, as in the arrangement according to FIG. 1, of strips 3 made of insulating material soaked with synthetic resin.

Im Anschluß an das Wickeln des Wickelleiters 8 zusammen mit den Streifen 3 wird die Wicklung erwärmt, wobei das in den Streifen 3 befindliche Kunstharz soweit erweicht, daß die Kunstharztränkungen von einander benachbarten Streifen 3 ineinander laufen und nach dem Wiedererhärten einen einheitlichen festen Körper bilden. Auf diese Weise ist praktisch ohne zusätzliche Hilfsmittel, insbesondere ohne Gießform ein blockähnlicher Wickelkörper geschaffen, in den der Wickelleiter 8 fest eingespannt ist und der zur Aufnahme der Einspannkräfte für die Wicklung als Ganzes sehr gut geeignet ist.Following the winding of the winding conductor 8 together with the strips 3, the winding is heated, whereby the synthetic resin located in the strips 3 softens to such an extent that the synthetic resin impregnations of adjacent strips 3 run into one another and form a uniform solid body after the re-hardening. In this way, a block-like winding body is created practically without additional aids, in particular without a casting mold, in which the winding conductor 8 is firmly clamped and which is very well suited for absorbing the clamping forces for the winding as a whole.

Claims (8)

1. A winding for dry transformers having turns, which consist of a wound conductor (8) made of bare metal and are arranged in radially superimposed layers in a massive block which resembles a cast body and consists of synthetic resin, characterised in
- that the bare wound conductor (8) is introduced into the winding assembly parallel and together with at least. one dry strip (3) which consists of an insulating material and is impregnated with synthetic resin;
- that at least one strip (3) is folded parallel to the wound conductor (8) at least twice;
- that an inner wound cylinder (2), layer insulations (5) and an outer wound cylinder (6) are likewise wound from the dry strip (3) impregnated with synthetic resin; and
- that the turns consisting of the bare wound conductor (8) and the strips (3) consisting of an insulating material, are bound together to form a block by means of the synthetic resin which is introduced as an impregnation and which has hardened after the termination of the winding process.
2. A winding according to Claim 1, characterised in that a tape which can be stretched, at least in the longitudinal direction, serves as the strip (3).
3. A winding according to Claim 2, characterised in that a fabric tape, the individual threads of which are arranged transversely to the longitudinal direction, serves as the strip (3).
4. A winding according to Claim 3, characterised in that a turn consisting of a strand (11) which is made of synthetic resin and approximately equals the wound conductor (8) in cross-section, is rolled up in front of the two ends of each layer.
5. A winding according to Claim 4, characterised in that the ends (7) of the wond conductor (8) are galvanically connected to outwardly protruding bolts (10) in connection plates (9) which are baked into the outer wound cylinder (6).
6. A winding according to one of Claims 1 to 5, characterised in that the hardening temperature of the synthetic resin corresponds to the temperature resistance of the strip (3).
7. A winding according to Claim 3 or Claim 6, characterised in that at the distance of the width of the wound conductor, the folded strip (3) is folded in opposite directions and is Z-shaped in cross-section.
8. A winding according to Claim 3 or Claim 6, characterised in that at the distance of the width of the wound conductor, the folded strip (3) is folded twice in the same direction and is U-shaped in cross-section.
EP81107042A 1980-09-19 1981-09-07 Winding for dry-type transformers Expired EP0048384B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81107042T ATE7250T1 (en) 1980-09-19 1981-09-07 WINDING FOR DRY TRANSFORMERS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803035530 DE3035530A1 (en) 1980-09-19 1980-09-19 WINDING FOR DRY TRANSFORMERS
DE3035530 1980-09-19

Publications (2)

Publication Number Publication Date
EP0048384A1 EP0048384A1 (en) 1982-03-31
EP0048384B1 true EP0048384B1 (en) 1984-04-25

Family

ID=6112440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107042A Expired EP0048384B1 (en) 1980-09-19 1981-09-07 Winding for dry-type transformers

Country Status (5)

Country Link
EP (1) EP0048384B1 (en)
JP (1) JPS5784112A (en)
AT (1) ATE7250T1 (en)
BR (1) BR8105530A (en)
DE (2) DE3035530A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4086927B1 (en) * 2021-05-05 2024-03-27 Hitachi Energy Ltd Coil for a transformer core

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR422073A (en) * 1910-05-19 1911-03-11 Robert Bosch Method of construction of coils of electrical devices
US1381567A (en) * 1917-06-30 1921-06-14 Kuttner Ernst Wolfgang Method of manufacturing electric coils
GB431579A (en) * 1933-01-11 1935-07-11 Aeg Improvements relating to electrical coils
GB460493A (en) * 1935-06-24 1937-01-28 British Thomson Houston Co Ltd Improvements in and relating to transformer windings
US2754355A (en) * 1952-02-08 1956-07-10 Allis Chalmers Mfg Co Crepe paper insulating elements
DE1151070B (en) * 1952-08-16 1963-07-04 Siemens Ag Process for embedding an electrical winding in irreversibly hardening casting resin, especially for measuring transducers, with the application of a bandage to the winding
DE1152756B (en) * 1961-01-05 1963-08-14 Inst Iaprueffeld Fuer Elek Sch Process for the production of layer insulation from overlapping paper tapes for transformers, converters and chokes
GB1156133A (en) * 1966-04-22 1969-06-25 Parsons C A & Co Ltd Improvements in and relating to Insulated Electrical Conductors
DE2111718A1 (en) * 1971-03-11 1972-09-14 Transformatoren Union Ag Layer winding for transformers, inductors and the like.
US3934332A (en) * 1974-11-26 1976-01-27 Westinghouse Electric Corporation Method of making electrical coils having improved strength and oil permeability
JPS5598810A (en) * 1979-01-24 1980-07-28 Toshiba Corp Coil wrapped with resin

Also Published As

Publication number Publication date
BR8105530A (en) 1982-05-18
EP0048384A1 (en) 1982-03-31
DE3035530A1 (en) 1982-05-06
ATE7250T1 (en) 1984-05-15
JPS5784112A (en) 1982-05-26
DE3163307D1 (en) 1984-05-30

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