EP0103237A2 - Method of making resin-encapsulated coils for transformers - Google Patents

Method of making resin-encapsulated coils for transformers Download PDF

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Publication number
EP0103237A2
EP0103237A2 EP83108604A EP83108604A EP0103237A2 EP 0103237 A2 EP0103237 A2 EP 0103237A2 EP 83108604 A EP83108604 A EP 83108604A EP 83108604 A EP83108604 A EP 83108604A EP 0103237 A2 EP0103237 A2 EP 0103237A2
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EP
European Patent Office
Prior art keywords
coils
winding
casting mold
mold
spacers
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.)
Granted
Application number
EP83108604A
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German (de)
French (fr)
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EP0103237B1 (en
EP0103237A3 (en
Inventor
Gerhard Dipl.-Ing. Altmann
Wolfgang Bendel
Rudolf Dedelmahr
Richard Dr. Pfeiffer
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Transformatoren Union AG
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Transformatoren Union AG
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Priority to AT83108604T priority Critical patent/ATE21185T1/en
Publication of EP0103237A2 publication Critical patent/EP0103237A2/en
Publication of EP0103237A3 publication Critical patent/EP0103237A3/en
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Publication of EP0103237B1 publication Critical patent/EP0103237B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating

Definitions

  • the invention relates to a method for producing windings for transformers embedded in cast resin according to the preamble of claim 1.
  • European patent application 80 108 131 already discloses a process for producing windings embedded in cast resin for electrical devices, according to which impregnated, corrugated insulating mats serve as spacers for fixing the electrical device parts to be encased in the mold. These insulating material mats remaining in the cast resin body simultaneously provide reinforcement for the cast resin molded material, which increases the mechanical strength of the cast resin molded material.
  • the known method also casts windings from coils lying one behind the other in the axial direction, the casting preferably being carried out in a lying position in an evacuated chamber by a axially parallel slot takes place in the outer jacket of the casting mold and then the hardening of the casting resin composition takes place at least partially in the mold itself at elevated temperature and at atmospheric or higher pressure.
  • the invention is therefore based on the object of specifying a method with which the good electrical properties and the mechanical properties of the cast resin body which are improved by inserting reinforcement can be fully utilized in the production of windings embedded in cast resin.
  • an inner jacket of the casting mold reduces the radial height of a corrugated and impregnated inner spacer by permanent deformation to the desired dimension of the casting resin wall thickness by spreading the inner jacket in a radial direction, its axially parallel overlapping in the circumferential direction Edges slide on each other and the coils of the winding by friction in the axial direction are fixed on the inner spacer, and the end mold walls also include the end edges of the mold shells with an elastic inside.
  • a device according to DE-PS 22 11 685 can be used to spread the inner shaped jacket, according to which profile strips provided on the circumference of a diameter-adjustable winding core change their radial position by moving on bolts in grooves arranged obliquely to the axial direction.
  • the spacers are constructed from two layers of corrugated insulating material mats, the direction of the corrugation of one layer against the winding axis + 45 ° and that of the other layer - 45 °, so that the corrugation of the two Layers crossed at 90 °.
  • Further measures according to the invention for adapting the cast resin body to occurring loads consist in the spacers projecting beyond the winding at both ends in the axial direction and in fiber bundles stretched in the circumferential direction formed by the bobbins and the spacers when the winding is rotating slowly, and in addition to that Reinforcement of the cast resin body also fiber bundles are inserted into the axially parallel shafts of the spacers.
  • fabric or fleece mats made of glass or polyester fibers impregnated with pure casting resin are used and serve as casting resin filled with pure quartz powder or pure epoxy resin.
  • a further expedient development of the invention consists in that the coils of the winding are pushed over the bare inner jacket of the casting mold and the inner spacer when the coils are held between the circumferentially overlapping edges of the slowly rotating inner jacket of the casting mold from a magazine in the same its installation position is pulled.
  • the method according to the invention for the production of castings of transformers embedded in cast resin is very advantageous, because it allows the adjustment of the particularly important and critical wall thickness of the cast resin encapsulation on the inside of the winding by deformation of the inserted reinforcement to practically any desired size, the initial dimensions of the spacers for a larger range of the cast resin body wall thickness are the same.
  • Coils 1 for a transformer winding are wound individually and independently of one another in a manner known per se on special devices. All coils 1 to be embedded in a common cast resin block lie in the radial direction between an inner spacer 2 and an outer spacer 3.
  • the spacers 2 and 3 in turn consist of woven or non-woven mats made of glass or epoxy resin and are corrugated like corrugated paper.
  • the waves normally extend parallel to the winding axis, the wave height being approximately equal to the wavelength.
  • An inner jacket 5 of a casting mold is pressed onto the inside of the inner spacer 2 in the direction of the arrows 4.
  • the pressing force required for this is transferred to the inner jacket 5 in a manner known per se by strips or other devices displaced on cones or inclined planes.
  • 5 balls or rollers are attached to the strips, not shown, along the lines of contact with the inner casing.
  • the inner jacket 5 is so far spread under deformation of the inner spacer 2 regardless of diameter tolerances that the thickness of the gap to be filled with casting resin just withstands the electrical and / or mechanical stress to be expected of the casting resin molding material during operation. Based on this, the dimensioning of the inner spacer 2 is previously designed with regard to the mechanical load to be expected.
  • an outer jacket 6 of a casting mold is placed, which essentially rests on the waves of the outer spacer 3 and applied to the bandages comprising them.
  • an axially parallel bulge 7 is provided, which forms a reinforcement on the cast resin body for receiving the winding leads and connection contacts.
  • a slot 8 is provided which is flanked by wall strips 9 which are bent approximately in the radial direction and which serves as a vent and pouring opening for the casting mold.
  • end mold walls 10 The end faces of the casting mold are closed by end mold walls 10, the side of which facing the inner jacket 5 and the outer jacket 6 is covered with a layer 11 of elastic material.
  • the end mold walls 10 are so strong with their layer 11 by an anchor plate 13 to the front edges of the inner shell 5 and the outer Sheath 6 pressed that they are pressed into the elastic layer 11.
  • the required pressing force for the anchor plates 13 is applied by nuts 14 on a tie rod 12.
  • the arrangement of coils 1, the inner spacer 2 and the outer spacer 3, which is embedded in the casting mold from the inner shell 5, the outer shell 6 and the end mold walls 10, is evacuated to a complete vacuum in a chamber (not shown) and then poured with pure epoxy resin or with an epoxy resin mixture containing up to 75% quartz powder. Depending on the existing conditions, the shape, the coils 1 and / or the casting compound are preheated.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Derartige Wicklungen sind üblicherweise aus in Achsrichtung hintereinanderliegenden Spulen (1) aufgebaut, die zwischen imprägnierten gewellten Isolierstoffmatten als Abstandshaltern (2, 3) eingespannt werden. Der eigentliche Verguß erfolgt üblicherweise bei liegender Form in einer evakuierten Kammer durch einen achsparallelen Schlitz (8). Erfindungsgemäß wird zur Einstellung der radial innerhalb der Spulen (1) liegenden Gießharzwandstärke ein innerer Mantel (5) der Gießform gegen den inneren Abstandshalter (2) gespreizt und verformt diesen bis auf das Sollmaß der Wandstärke, wobei sich die in Umfangsrichtung überlappenden achsparallelen Ränder des inneren Mantels (5) der Gießform in Umfangsrichtung aufeinander bewegen. Dadurch sind die Spulen (1) durch Kraftschluß auf dem inneren Abstandshalter (2) fixiert. Stirnseitige Formwände (10) umfassen mit einer elastischen Innenseite die stirnseitigen Kanten des inneren (5) und eines äußeren Mantels (6) der Gießform. Das erfindungsgemäße Verfahren ermöglicht eine sehr feine Anpassung der Wanddicken von Gießharzumgüssen für Transformatorwicklungen bei verhältnismäßig unterschiedlichen Voraussetzungen ohne hierzu einen hohen Bedarf an unterschiedlichen Vorrichtungen zu erfordern.

Figure imgaf001
Such windings are usually constructed from coils (1) lying one behind the other in the axial direction, which are clamped between impregnated corrugated insulating mats as spacers (2, 3). The actual encapsulation is usually carried out in a lying shape in an evacuated chamber through an axially parallel slot (8). According to the invention, in order to adjust the cast resin wall thickness lying radially inside the coils (1), an inner jacket (5) of the casting mold is spread against the inner spacer (2) and deforms it to the desired dimension of the wall thickness, the axially parallel edges of the inner one overlapping in the circumferential direction Move the shell (5) of the casting mold onto one another in the circumferential direction. As a result, the coils (1) are fixed on the inner spacer (2) by frictional engagement. End-side mold walls (10) have an elastic inner side and cover the end-side edges of the inner (5) and an outer shell (6) of the casting mold. The method according to the invention enables a very fine adjustment of the wall thicknesses of cast resin castings for transformer windings under relatively different conditions without requiring a great need for different devices.
Figure imgaf001

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von in Gießharz eingebetteten Wicklungen für Transformatoren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for producing windings for transformers embedded in cast resin according to the preamble of claim 1.

Mit zunehmendem Einsatz von Gießharztransformatoren bekommt die Optimierung, insbesondere auch des eingesetzten Gießharzes steigende wirtschaftliche Bedeutung. Aus diesem Grund wird eine gleich gute Ausnutzung der vorteilhaften elektrischen und mechanischen Eigenschaften des Gießharzformstoffes angestrebt, wobei mögliche kleinere Wanddicken des Gießharzkörpers zusätzlich erhebliche thermische Vorteile bringen.With the increasing use of cast resin transformers, the optimization, in particular also of the cast resin used, is of increasing economic importance. For this reason, an equally good exploitation of the advantageous electrical and mechanical properties of the cast resin molding material is sought, with possible smaller wall thicknesses of the cast resin body additionally bringing considerable thermal advantages.

Durch die europäische Patentanmeldung 80 108 131 ist schon ein Verfahren zur Herstellung in Gießharz eingebetteter Wicklungen für elektrische Geräte bekannt, wonach imprägnierte, gewellte Isolierstoffmatten als Abstandshalter zur Fixierung der einzuhüllenden elektrischen Geräteteile in der Gießform dienen. Diese im Gießharzkörper verbleibenden Isolierstoffmatten bewirken gleichzeitig für den Gießharzformstoff eine Armierung, die die mechanische Belastbarkeit des Gießharzformstoffes erhöht.European patent application 80 108 131 already discloses a process for producing windings embedded in cast resin for electrical devices, according to which impregnated, corrugated insulating mats serve as spacers for fixing the electrical device parts to be encased in the mold. These insulating material mats remaining in the cast resin body simultaneously provide reinforcement for the cast resin molded material, which increases the mechanical strength of the cast resin molded material.

Durch das bekannte Verfahren werden auch Wicklungen aus in Achsrichtung hintereinanderliegenden Spulen vergossen, wobei der Verguß vorzugsweise bei liegender Form in einer evakuierten Kammer durch einen achsparallelen Schlitz im äußeren Mantel der Gießform erfolgt und wonach die Aushärtung der Gießharzmasse mindestens teilweise in der Form selbst bei erhöhter Temperatur und bei atmosphärischem oder höherem Druck erfolgt.The known method also casts windings from coils lying one behind the other in the axial direction, the casting preferably being carried out in a lying position in an evacuated chamber by a axially parallel slot takes place in the outer jacket of the casting mold and then the hardening of the casting resin composition takes place at least partially in the mold itself at elevated temperature and at atmospheric or higher pressure.

Zur Durchführung des bekannten Verfahrens sind jedoch Abstandshalter bzw. Armierungseinlagen in einer sehr großen Anzahl von verschiedenen Abmessungen erforderlich, die wiederum eine Vielzahl von teuren Hilfswerkzeugen zu ihrer Herstellung erfordern. Praktisch werden zur Begrenzung der Anzahl der zur Herstellung der Abstandshalter erforderlichen Hilfswerkzeuge nur Abstandshalter in bestimmten gegeneinander abgestuften Abmessungen hergestellt, so daß die elektrische und die mechanische Belastbarkeit der Gießharzkörper häufig nicht voll ausgenutzt ist.To carry out the known method, however, spacers or reinforcing inserts in a very large number of different dimensions are required, which in turn require a large number of expensive auxiliary tools for their production. In practice, in order to limit the number of auxiliary tools required for the production of the spacers, only spacers are produced in certain mutually graduated dimensions, so that the electrical and mechanical resilience of the cast resin body is often not fully utilized.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem bei der Herstellung von in Gießharz eingebetteten Wicklungen die guten elektrischen und die durch eingelegte Armierung verbesserten mechanischen Eigenschaften des Gießharzkörpers voll ausnutzbar sind.The invention is therefore based on the object of specifying a method with which the good electrical properties and the mechanical properties of the cast resin body which are improved by inserting reinforcement can be fully utilized in the production of windings embedded in cast resin.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß ein innerer Mantel der Gießform die radiale Höhe eines gewellten und imprägnierten innenliegenden Abstandshalters durch bleibende Verformung bis auf das Sollmaß der Gießharzkörperwanddicke verkleinert, indem der innere Mantel in radialer Richtung gespreizt wird, wobei seine sich in Umfangsrichtung überlappenden achsparallelen Ränder aufeinander gleiten und wobei die Spulen der Wicklung durch Kraftschluß in Achsrichtung auf dem innenliegenden Abstandshalter fixiert sind, und wobei außerdem die stirnseitigen Formwände die stirnseitigen Kanten der Gießformmäntel mit einer elastischen Innenseite umfassen.According to the invention, this object is achieved in that an inner jacket of the casting mold reduces the radial height of a corrugated and impregnated inner spacer by permanent deformation to the desired dimension of the casting resin wall thickness by spreading the inner jacket in a radial direction, its axially parallel overlapping in the circumferential direction Edges slide on each other and the coils of the winding by friction in the axial direction are fixed on the inner spacer, and the end mold walls also include the end edges of the mold shells with an elastic inside.

Zur Spreizung des innenliegenden Formmantels kann beispielsweise eine Vorrichtung gemäß der DE-PS 22 11 685 eingesetzt werden, wonach auf dem Umfang eines im Durchmesser einstellbaren Wickelkernes vorgesehene Profilleisten ihre radiale Lage durch Verschieben auf Bolzen in schräg zur Achsrichtung angeordneten Nuten verändern.A device according to DE-PS 22 11 685, for example, can be used to spread the inner shaped jacket, according to which profile strips provided on the circumference of a diameter-adjustable winding core change their radial position by moving on bolts in grooves arranged obliquely to the axial direction.

Nach zweckmäßigen Weiterbildungen der Erfindung ist vorgesehen, daß die Abstandshalter aus zwei Lagen von gewellten Isolierstoffmatten aufgebaut sind, wobei die Richtung der Wellfaltung einer Lage gegen die Wicklungsachse + 45° und die der anderen Lage - 45° beträgt, so daß sich die Wellfaltung der beiden Lagen unter 90° kreuzt. Weitere erfindungsgemäße Maßnahmen zur Anpassung des Gießharzkörpers an auftretende Belastungen bestehen darin, daß die Abstandshalter die Wicklung an beiden Enden in Achsrichtung überragen und daß in von den Spulen und den Abstandshaltern gebildete Kammern bei langsam rotierender Wicklung in Umfangsrichtung gestreckte Faserbündel eingelegt werden, und daß zur zusätzlichen Armierung des Gießharzkörpers auch Faserbündel in die achsparallelen Wellen der Abstandshalter eingelegt werden.According to expedient developments of the invention it is provided that the spacers are constructed from two layers of corrugated insulating material mats, the direction of the corrugation of one layer against the winding axis + 45 ° and that of the other layer - 45 °, so that the corrugation of the two Layers crossed at 90 °. Further measures according to the invention for adapting the cast resin body to occurring loads consist in the spacers projecting beyond the winding at both ends in the axial direction and in fiber bundles stretched in the circumferential direction formed by the bobbins and the spacers when the winding is rotating slowly, and in addition to that Reinforcement of the cast resin body also fiber bundles are inserted into the axially parallel shafts of the spacers.

Gemäß vorteilhaften Ausgestaltungen der Erfindung werden als Abstandshalter mit reinem Gießharz imprägnierte Gewebe- oder Vliesmatten aus Glas- oder Polyesterfasern verwendet und dient als Gießharz mit Quarzmehl gefülltes oder reines Epoxydharz.According to advantageous embodiments of the invention, fabric or fleece mats made of glass or polyester fibers impregnated with pure casting resin are used and serve as casting resin filled with pure quartz powder or pure epoxy resin.

Eine weitere zweckmäßige Weiterbildung der Erfindung besteht darin, daß die Spulen der Wicklung über den blanken inneren Mantel der Gießform geschoben sind und der innere Abstandshalter bei festgehaltenen Spulen zwischen den sich in Umfangsrichtung überlappenden Rändern des langsam rotierenden inneren Mantels der Gießform aus einem Magazin in derselben in seine Einbaulage gezogen wird.A further expedient development of the invention consists in that the coils of the winding are pushed over the bare inner jacket of the casting mold and the inner spacer when the coils are held between the circumferentially overlapping edges of the slowly rotating inner jacket of the casting mold from a magazine in the same its installation position is pulled.

Das erfindungsgemäße Verfahren zur Herstellung in Gießharz eingebetteter Wicklungen von Transformatoren ist sehr vorteilhaft, denn es erlaubt die Anpassung der besonders wichtigen und kritischen Wandstärke des Gießharzumgusses auf der Innenseite der Wicklung durch Verformung der eingelegten Armierung auf praktisch jedes gewünschte Maß, wobei die Ausgangsabmessungen der Abstandshalter für jeweils einen größeren Bereich der Gießharzkörperwanddicke gleich sind.The method according to the invention for the production of castings of transformers embedded in cast resin is very advantageous, because it allows the adjustment of the particularly important and critical wall thickness of the cast resin encapsulation on the inside of the winding by deformation of the inserted reinforcement to practically any desired size, the initial dimensions of the spacers for a larger range of the cast resin body wall thickness are the same.

Das erfindungsgemäße Verfahren wird anhand eines Ausführungsbeispiels für eine Gießform zum Umgießen einer Transformatorwicklung näher erläutert. Dabei zeigt

  • Fig. 1 einen Quer- und
  • Fig. 2 einen achsparallelen Längsschnitt durch eine zum Umgießen vorgesehene Transformatorwicklung.
The method according to the invention is explained in more detail using an exemplary embodiment for a casting mold for casting around a transformer winding. It shows
  • Fig. 1 is a cross and
  • Fig. 2 shows an axially parallel longitudinal section through a transformer winding provided for casting.

Spulen 1 für eine Transformatorwicklung, beispielsweise eine Oberspannungswicklung, sind einzeln und unabhängig voneinander in an sich bekannter Weise auf besonderen Einrichtungen gewickelt. Alle in einen gemeinsamen Gießharzblock einzubettenden Spulen 1 liegen in radialer Richtung zwischen einem inneren Abstandshalter 2 und einem äußeren Abstandshalter 3. Die Abstandshalter 2 und 3 bestehen ihrerseits aus Gewebe- oder Vliesmatten aus Glas- oder Epoxydharz und sind ähnlich wie Wellpapier gewellt. Die Wellen erstrecken sich im Normalfall parallel zur Wicklungsachse, dabei ist die Wellenhöhe ungefähr gleich der Wellenlänge.Coils 1 for a transformer winding, for example a high-voltage winding, are wound individually and independently of one another in a manner known per se on special devices. All coils 1 to be embedded in a common cast resin block lie in the radial direction between an inner spacer 2 and an outer spacer 3. The spacers 2 and 3 in turn consist of woven or non-woven mats made of glass or epoxy resin and are corrugated like corrugated paper. The waves normally extend parallel to the winding axis, the wave height being approximately equal to the wavelength.

An die Innenseite des inneren Abstandshalters 2 wird in Richtung der Pfeile 4 ein innerer Mantel 5 einer Gießform angepreßt. Die hierzu erforderliche Preßkraft wird in an sich bekannter Weise durch auf Kegeln oder schiefen Ebenen verschobenen Leisten oder sonstigen Vorrichtungen auf den inneren Mantel 5 übertragen. Zur Verringerung der Reibung und zur Verhinderung von Verspannungen in Umfangsrichtung sind an den nicht dargestellten Leisten entlang der Berührungslinien mit dem inneren Mantel 5 Kugeln oder Rolle angebracht.An inner jacket 5 of a casting mold is pressed onto the inside of the inner spacer 2 in the direction of the arrows 4. The pressing force required for this is transferred to the inner jacket 5 in a manner known per se by strips or other devices displaced on cones or inclined planes. To reduce the friction and to prevent tension in the circumferential direction, 5 balls or rollers are attached to the strips, not shown, along the lines of contact with the inner casing.

Der innere Mantel 5 wird unter Verformung des inneren Abstandshalters 2 unabhängig von Durchmessertoleranzen so weit gespreizt, daß die Stärke des mit Gießharz auszufüllenden Spaltes der im Betrieb zu erwartenden elektrischen und/oder mechanischen Beanspruchung des Gießharzformstoffes gerade standhält. Ausgehend hiervon ist vorher die Bemessung des inneren Abstandshalters 2 im Hinblick auf die zu erwartende mechanische Belastung ausgelegt.The inner jacket 5 is so far spread under deformation of the inner spacer 2 regardless of diameter tolerances that the thickness of the gap to be filled with casting resin just withstands the electrical and / or mechanical stress to be expected of the casting resin molding material during operation. Based on this, the dimensioning of the inner spacer 2 is previously designed with regard to the mechanical load to be expected.

Bei insgesamt niedrigen elektrischen Beanspruchungen des Gießharzformstoffes und gleichzeitig hohen mechanischen Belastungen werden zur Beherrschung der letzteren in alle oder in einige der Wellen achsparallel ausgerichtete Faserbündel zur zusätzlichen Armierung des Gießharzkörpers eingelegt. Eine weitere Verfestigung des Gießharzkörpers ergibt sich durch Einwickeln von Faserbündeln in die ringförmigen Kammern, die von den Spulen 1 in axialer Richtung und von den Abstandshaltern 2 und 3 in radialer Richtung umschlossen sind. Schließlich tragen auch außen um den äußeren Abstandshalter 3 herumgelegte nicht dargestellte Bandagen zur Erhöhung der mechanischen Festigkeit des Gießharzkörpers in Umfangsrichtung bei. Durch diese nicht dargestellten Bandagen ist es darüber hinaus möglich, auch die Stärke des von dem äußeren Abstandshalter 3 offen gehaltenen Spaltes unabhängig von Durchmessertoleranzen an den Spulen 1 einzustellen.In the case of low overall electrical stresses on the cast resin molding material and at the same time high mechanical loads, fiber bundles are placed in all or in some of the shafts for parallel reinforcement of the cast resin body in order to master the latter. A further solidification of the cast resin body results from the wrapping of fiber bundles in the annular Chambers which are enclosed by the coils 1 in the axial direction and by the spacers 2 and 3 in the radial direction. Finally, bandages, not shown, placed around the outer spacer 3 also contribute to increasing the mechanical strength of the cast resin body in the circumferential direction. Through these bandages, not shown, it is also possible to set the thickness of the gap held open by the outer spacer 3 independently of the diameter tolerances on the coils 1.

Um die Wicklungsanordnung aus den Spulen 1,dem von innen gegen diese gespreizten inneren Abstandshalter 2 und dem inneren Mantel 5 sowie dem von außen um die Spulen 1 bandagierten äußeren Abstandshalter 3 ist ein äußerer Mantel 6 einer Gießform gelegt, der sich im wesentlichen an die Wellen des äußeren Abstandshalters 3 sowie an die diesen umfassenden Bandagen anlegt. In dem äußeren Mantel 6 ist eine achsparallele Ausbuchtung 7 vorgesehen, die am Gießharzkörper eine Verstärkung zur Aufnahme der Wicklungsausleitungen und -anschlußkontakte formt. Gegenüber von der Ausbuchtung 7 ist ein Schlitz 8 vorgesehen, der von in etwa in radialer Richtung abgekanteten Wandstreifen 9 flankiert ist und als Entlüftungs- und Eingußöffnung für die Gießform dient.Around the winding arrangement of the coils 1, the inner spacer 2 and the inner jacket 5 spread from the inside against this, and the outer spacer 3 bandaged from the outside around the coils 1, an outer jacket 6 of a casting mold is placed, which essentially rests on the waves of the outer spacer 3 and applied to the bandages comprising them. In the outer jacket 6, an axially parallel bulge 7 is provided, which forms a reinforcement on the cast resin body for receiving the winding leads and connection contacts. Opposite the bulge 7, a slot 8 is provided which is flanked by wall strips 9 which are bent approximately in the radial direction and which serves as a vent and pouring opening for the casting mold.

Die Stirnseiten der Gießform sind durch stirnseitige Formwände 10 verschlossen, deren dem inneren Mantel 5 und dem äußeren Mantel 6 zugekehrte Seite mit einer Schicht 11 aus elastischem Werkstoff belegt ist. Die stirnseitigen Formwände 10 werden mit ihrer Schicht 11 durch je eine Ankerplatte 13 so stark an die stirnseitigen Kanten des inneren Mantels 5 und des äußeren Mantels 6 gepreßt, daß diese in die elastische Schicht 11 eingedrückt werden. Die hierzu erforderliche Preßkraft für die Ankerplatten 13 wird durch Muttern 14 auf einer Zugstange 12 aufgebracht.The end faces of the casting mold are closed by end mold walls 10, the side of which facing the inner jacket 5 and the outer jacket 6 is covered with a layer 11 of elastic material. The end mold walls 10 are so strong with their layer 11 by an anchor plate 13 to the front edges of the inner shell 5 and the outer Sheath 6 pressed that they are pressed into the elastic layer 11. The required pressing force for the anchor plates 13 is applied by nuts 14 on a tie rod 12.

Die so in die Gießform aus dem inneren Mantel 5, dem äußeren Mantel 6 sowie den stirnseitigen Formwänden 10 eingebettete Anordnung aus Spulen 1, dem inneren Abstandshalter 2 und dem äußeren Abstandshalter 3 wird in einer nicht dargestellten Kammer bis nahe an ein vollkommenes Vakuum evakuiert und dann mit reinem Epoxydharz oder mit einem bis zu 75 % Quarzmehl aufweisenden Epoxydharzgemisch ausgegossen. Dabei sind je nach den vorliegenden Verhältnissen, die Form, die Spulen 1 und/oder die Gußmasse vorgewärmt.The arrangement of coils 1, the inner spacer 2 and the outer spacer 3, which is embedded in the casting mold from the inner shell 5, the outer shell 6 and the end mold walls 10, is evacuated to a complete vacuum in a chamber (not shown) and then poured with pure epoxy resin or with an epoxy resin mixture containing up to 75% quartz powder. Depending on the existing conditions, the shape, the coils 1 and / or the casting compound are preheated.

Im Anschluß an das Füllen der Gießform mit Gußmasse wird diese dem atmosphärischem Druck oder einem höheren Druck ausgesetzt, so daß der aus dem von den Wandstreifen 9 gebildeten Trichter vorhandene Gußmasseüberschuß bis zur vollständigen Erstarrung des Gießharzkörpers Gußmasse in die Gießform nachgedrückt wird.Following the filling of the casting mold with casting compound, this is exposed to atmospheric pressure or a higher pressure, so that the excess casting compound from the funnel formed by the wall strips 9 is pressed into the casting mold until the casting resin body has completely solidified.

Claims (10)

1. Verfahren zur Herstellung in Gießharz eingebetteter Wicklungen für Transformatoren, - wonach die in Achsrichtung hintereinanderliegenden Spulen (1) der Wicklung je für sich und unabhängig voneinander gewickelt werden, - wonach imprägnierte, gewellte Isolierstoffmatten in radialer Richtung als Abstandshalter (2, 3) zwischen einem inneren Mantel (5) der Gießform und Spulen (1) der Wicklung sowie zwischen den Spulen (1) der Wicklung und einem äußeren Mantel (6) der Gießform dienen, - wonach der innere (5) und der äußere Mantel (6) der Gießform zwischen stirnseitigen Formwänden (10) fixiert sind, - wonach der Verguß bei liegender Form in einer evakuierten Kammer durch einen achsparallelen Schlitz (8) im äußeren Mantel (6) der Gießform erfolgt und - wonach die Aushärtung der Gießharzmasse mindestens teilweise in der Form bei erhöhter Temperatur und bei atmosphärischem oder höheren Druck erfolgt, dadurch gekennzeichnet , - daß der innere Mantel (5) der Gießform die radiale Höhe des innenliegenden Abstandshalters (2) durch bleibende Verformung bis auf das Sollmaß verkleinert, indem der innere Mantel (5) in radialer Richtung gespreizt wird, wobei seine sich in Umfangsrichtung überlappenden achsparallelen Ränder aufeinandergleiten, - daß die Spulen (1) der Wicklung durch Kraftschluß in Achsrichtung auf dem innenliegenden Abstandshalter (2) fixiert sind und - daß die stirnseitigen Formwände (10) die stirnseitigen Kanten des inneren (5) und des äußeren Mantels (6) der Gießform mit einer elastische Innenseite (11) umfassen. 1. Process for producing windings for transformers embedded in cast resin, - After which the coils (1) of the winding lying one behind the other in the axial direction are wound independently and independently of one another - After which impregnated, corrugated insulating mats in the radial direction as a spacer (2, 3) between an inner jacket (5) of the mold and coils (1) of the winding and between the coils (1) of the winding and an outer jacket (6) of the mold serve, - After which the inner (5) and the outer jacket (6) of the casting mold are fixed between the end mold walls (10), - After which the potting takes place in a lying shape in an evacuated chamber through an axially parallel slot (8) in the outer jacket (6) and according to which the curing of the cast resin composition takes place at least partially in the mold at elevated temperature and at atmospheric or higher pressure, characterized in that - That the inner jacket (5) of the casting mold reduces the radial height of the inner spacer (2) by permanent deformation to the nominal size by the inner jacket (5) being spread in the radial direction, its axially parallel edges overlapping in the circumferential direction sliding on one another , - That the coils (1) of the winding are fixed by adhesion in the axial direction on the inner spacer (2) and - That the end mold walls (10) the front term edges of the inner (5) and the outer shell (6) of the casting mold with an elastic inside (11). 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet , daß die Abstandshalter (2, 3) aus zwei Lagen der Isolierstoffmatten aufgebaut sind, wobei die Richtung der Wellfaltung einer Lage gegen die Wicklungsachse + 45° und die der anderen Lage - 45° beträgt, so daß sich die Wellfaltung der beiden Lagen unter 90° kreuzt.2. The method according to claim 1, characterized in that the spacers (2, 3) are constructed from two layers of insulating mats, the direction of the corrugated folding of one layer against the winding axis + 45 ° and that of the other layer - 45 °, so that the corrugated fold of the two layers crosses at 90 °. 3. Verahren nach Anspruch 1 und 2, dadurch gekennzeichnet , daß die Abstandshalter (2, 3) die Wicklung an beiden Enden in Achsrichtung überragen.3. The method according to claim 1 and 2, characterized in that the spacers (2, 3) project beyond the winding at both ends in the axial direction. 4. Verfahren nach einem der Ansprüche 1 bis 3, d a - durch gekennzeichnet, daß in von den Spulen (1) und den Abstandshaltern (2, 3) gebildete Kammern bei langsam rotierender Wicklung in Umfangsrichtung gestreckte Faserbündel eingelegt werden.4. The method according to any one of claims 1 to 3, d a - characterized in that stretched fiber bundles are inserted into the chambers formed by the coils (1) and the spacers (2, 3) with slowly rotating winding in the circumferential direction. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet , daß zur zusätzlichen Armierung des Gießharzkörpers Faserbündel in die achsparallelen Wellen der Abstandshalter (2, 3) eingelegt werden.5. The method according to any one of claims 1 to 4, characterized in that fiber bundles are inserted into the axially parallel shafts of the spacers (2, 3) for additional reinforcement of the cast resin body. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß als Abstandshalter (2, 3) mit reinem Gießharz imprägnierte Gewebe- oder Vliesmatten aus Glas- oder Kunststofffasern verwendet werden.6. The method according to any one of claims 1 to 5, characterized in that woven or non-woven mats made of glass or plastic fibers are used as spacers (2, 3) impregnated with pure casting resin. 7. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die als Abstandshalter (2, 3) dienenden Isolierstoffmatten erst nach ihrem Einbau in die Gießform imprägniert werden.7. The method according to any one of claims 1 to 5, characterized in that the insulating mats serving as spacers (2, 3) are only impregnated after their installation in the casting mold. 8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß als Gießharz mit Quarzmehl gefülltes oder reines Epoxydharz verwendet wird.8. The method according to any one of claims 1 to 7, characterized in that the casting resin filled with quartz powder or pure epoxy resin is used. 9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Gießform und/oder die Wicklung vorgeheizt werden.9. The method according to any one of claims 1 to 8, characterized in that the casting mold and / or the winding are preheated. 10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Spulen (1) über den blanken inneren Mantel (5) der Gießform geschoben sind und der innere Abstandshalter (2) bei festgehaltenen Spulen (1) zwischen den sich in Umfangsrichtung überlappenden Rändern des langsam rotierenden inneren Mantels (5) der Gießform aus einem Magazin in derselben in seine Einbaulage gezogen wird.10. The method according to any one of claims 1 to 9, characterized in that the coils (1) are pushed over the bare inner jacket (5) of the casting mold and the inner spacer (2) with the coils (1) held between them in the circumferential direction overlapping edges of the slowly rotating inner shell (5) of the casting mold from a magazine in the same is pulled into its installation position.
EP83108604A 1982-09-14 1983-08-31 Method of making resin-encapsulated coils for transformers Expired EP0103237B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83108604T ATE21185T1 (en) 1982-09-14 1983-08-31 PROCESS FOR MANUFACTURING TRANSFORMER WINDINGS EMBEDDED IN CAST RESIN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823234098 DE3234098A1 (en) 1982-09-14 1982-09-14 METHOD FOR PRODUCING WINDINGS EMBEDDED IN CASTING RESIN FOR TRANSFORMERS
DE3234098 1982-09-14

Publications (3)

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EP0103237A2 true EP0103237A2 (en) 1984-03-21
EP0103237A3 EP0103237A3 (en) 1985-01-23
EP0103237B1 EP0103237B1 (en) 1986-07-30

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EP83108604A Expired EP0103237B1 (en) 1982-09-14 1983-08-31 Method of making resin-encapsulated coils for transformers

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US (1) US4540536A (en)
EP (1) EP0103237B1 (en)
JP (1) JPS5966110A (en)
AT (1) ATE21185T1 (en)
DE (2) DE3234098A1 (en)

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EP0172494A1 (en) * 1984-08-20 1986-02-26 Siemens Aktiengesellschaft Method for manufacturing epoxy resin-embedded windings for transformers
EP0295669A1 (en) * 1987-06-19 1988-12-21 Alcatel SEL Aktiengesellschaft Method for embedding electric coil windings in a insulating compound and a mould therefor
WO1999049478A3 (en) * 1998-03-26 1999-12-02 Gennady Mikhailovich Chernykh Method of impregnation and polymerisation for a high-current coil
NL1017426C2 (en) * 2001-02-22 2002-08-23 Tno Method for manufacturing an electromagnetic coil, device obtained with the method and actuator.
RU2192702C2 (en) * 2001-01-03 2002-11-10 Открытое акционерное общество "Научно-исследовательский институт взрывозащищенных электрических машин" г. Кемерово Electric motor winding impregnation process

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EP0172494A1 (en) * 1984-08-20 1986-02-26 Siemens Aktiengesellschaft Method for manufacturing epoxy resin-embedded windings for transformers
EP0295669A1 (en) * 1987-06-19 1988-12-21 Alcatel SEL Aktiengesellschaft Method for embedding electric coil windings in a insulating compound and a mould therefor
WO1999049478A3 (en) * 1998-03-26 1999-12-02 Gennady Mikhailovich Chernykh Method of impregnation and polymerisation for a high-current coil
RU2145745C1 (en) * 1998-03-26 2000-02-20 Черных Геннадий Михайлович Unit for impregnating heavy-current coil and polymerizing epoxy compound
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Also Published As

Publication number Publication date
DE3234098A1 (en) 1984-03-15
DE3364953D1 (en) 1986-09-04
ATE21185T1 (en) 1986-08-15
EP0103237B1 (en) 1986-07-30
EP0103237A3 (en) 1985-01-23
JPS5966110A (en) 1984-04-14
US4540536A (en) 1985-09-10

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