EP2154698B1 - Method for manufacturing a tear-proof resin transformer and tear-proof resin transformer - Google Patents

Method for manufacturing a tear-proof resin transformer and tear-proof resin transformer Download PDF

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Publication number
EP2154698B1
EP2154698B1 EP09161058.4A EP09161058A EP2154698B1 EP 2154698 B1 EP2154698 B1 EP 2154698B1 EP 09161058 A EP09161058 A EP 09161058A EP 2154698 B1 EP2154698 B1 EP 2154698B1
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Prior art keywords
resin
cast
added
liquid
filler
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EP09161058.4A
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German (de)
French (fr)
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EP2154698A2 (en
EP2154698A3 (en
Inventor
Christoph Scheuer
Fritz Sorg
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Siemens AG
Hexion GmbH
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Siemens AG
Momentive Specialty Chemicals GmbH
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Priority to PL09161058T priority Critical patent/PL2154698T3/en
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Publication of EP2154698A3 publication Critical patent/EP2154698A3/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • 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 a crack-resistant cast-resin transformer, wherein a casting resin for electrical insulation of a winding body of the cast-resin transformer is used. Furthermore, the invention relates to a cast-resin transformer with an existing of cast resin electrical insulation of a winding body of the cast resin transformer.
  • casting resins in particular epoxy resins
  • electrical insulation of electrical components in particular high-voltage transformers
  • casting resins have the advantage that casting resins on the one hand have high electrical strengths and on the other hand are mechanically very stable in the cured state.
  • the problem with the use of casting resins is that the casting resin is liquid and thus difficult to process only in the heated state.
  • the DE 44 32 188 A1 an epoxy resin molding compound, which in addition to a phosphorus-modified epoxy resin further additives and inorganic fillers.
  • the epoxy resin molding composition is technically simpler and thus cheaper to produce and should have a lower water absorption and higher thermal shock resistance compared to known epoxy molding compounds.
  • a potting compound in particular for producing molded parts with embedded therein inserts, consisting of a base component and at least one additive, wherein the base component is a casting resin and the base component at least two additives, in particular quartz powder and a mineral fiber material having.
  • a problem with the casting resin transformers produced hitherto in the state of the art is that they have a high electrical output Load or, in the case of a cold shock test prescribed in accordance with standard IEC600 76 - 11, cracks, especially at the material transitions.
  • the risk of cracking is greater, the faster the curing of the casting resin during manufacture takes place. For this reason, very long curing times have hitherto been chosen in the prior art, so that a virtually uniform cooling of all components of the entire cast-resin transformer is ensured.
  • the curing process until removal of the final casting mold from the cast-resin transformer therefore takes in part more than 30 hours.
  • Object of the present invention is therefore to shorten the curing process during the production of a cast-resin transformer.
  • a toughening modifier of up to 20 phr is added to the liquid casting resin in comparison with the base component of the casting resin.
  • the term phr parts per hundred resin
  • phr parts per hundred resin
  • an accelerator is added in such a concentration that results in a gel time of less than 15 minutes at 140 ° C, wherein the enriched with these two components liquid casting resin for casting of the winding body and the thus-cast winding body for curing one linear or stepped rising temperature profile is exposed.
  • An example of this is the following temperature profile, in which within 4 hours, the composite liquid casting resin is continuously increased from a temperature of 80 ° C to 100 ° C. Subsequently, the temperature is continuously increased to 130 ° C and then finally cured for several hours at this temperature. An otherwise slow cooling in the cooling area for reducing the internal thermal stresses (annealing) is not necessary according to the present method.
  • Toughness modifiers are known for improving the temperature resistance of casting resins (for example DE 601 04 449 T2 ).
  • the use of cure accelerators for example DE 42 06 733 C2 ), the polymerization or polyaddition accelerates conversion to a crosslinked composite matrix of the thermosetting molding resin.
  • the sole or non-coordinated addition of accelerators to a liquid casting resin leads just to a rapid curing with high mechanical stresses, which forms in case of frequent temperature changes of the cast resin transformer during operation, the cracks to be avoided.
  • the crack resistance of the casting resin can be increased in such a way that mechanical stresses just do not arise during the curing process and thus at the same time the curing times can be reduced.
  • the combination of the toughness modifier with adjusted accelerator concentrations and a co-ordinated curing process reduces or eliminates the cracking of a cast resin transformer thus produced.
  • liquid casting resin as an accelerator in particular a tertiary amine and / or a quaternary ammonium compound is added.
  • the temperature profile is controlled during the curing process of the liquid casting resin by means of a temperature distribution in a furnace surrounding the winding body.
  • a filler is added to the liquid casting resin, in particular a mineral quartz powder.
  • a filler is added to the liquid casting resin, in order in addition to increase the composite matrix of the hardening casting resin by the glass short fibers to reinforce.
  • a toughening modifier of up to 20 phr is added to the casting resin of the cast-resin transformer.
  • a filler is advantageously added to the casting resin, wherein, based on the weight percent of the filler of up to 5 percent by weight glass short fibers are added to the casting resin.
  • the filler is a mineral filler, in particular an amorphous quartz powder.
  • the accelerator is in particular a tert. Amine and / or a quaternary ammonium compound and the toughness modifier, a copolymer, in particular an acrylonitrile or a silicone rubber.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulating Of Coils (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines rissfesten Gießharztransformators, wobei ein Gießharz zur elektrischen Isolation eines Wicklungskörpers des Gießharztransformators verwendet wird. Des Weiteren betrifft die Erfindung einen Gießharztransformator mit einer aus Gießharz bestehenden elektrischen Isolation eines Wicklungskörpers des Gießharztransformators.The invention relates to a method for producing a crack-resistant cast-resin transformer, wherein a casting resin for electrical insulation of a winding body of the cast-resin transformer is used. Furthermore, the invention relates to a cast-resin transformer with an existing of cast resin electrical insulation of a winding body of the cast resin transformer.

Die Verwendung von Gießharzen, insbesondere Epoxydharzen, für die elektrische Isolation von elektrischen Bauteilen, insbesondere Hochspannungstransformatoren, ist seit Jahren Stand der Technik. Im Transformatorbau haben Gießharzen den Vorteil, dass Gießharze zum einen eine hohe elektrische Festigkeiten aufweisen und zum anderen im ausgehärteten Zustand mechanisch sehr stabil sind. Problematisch bei der Verwendung von Gießharzen ist jedoch, dass das Gießharz lediglich im erwärmten Zustand flüssig und damit schwer verarbeitbar ist. Aufgrund der dabei zum Teil hohen Temperaturen entstehen während des Abkühlungsprozesses jedoch örtlich unterschiedliche Temperaturgradienten im Gießharz bzw. an den Materialübergängen, wie beispielsweise zwischen dem Gießharz und den im Gießharz eingebetteten Aluminiumwicklungen, die zu mechanischen Spannungen und damit Rissen im Gießharz oder in den Materialübergängen führen können. Daher werden bisher die thermischen Eigenspannungen durch ein gezieltes und zeitaufwendiges Abkühlen des zuvor thermisch ausgehärteten Gießharzkörpers reduziert (Tempern).The use of casting resins, in particular epoxy resins, for the electrical insulation of electrical components, in particular high-voltage transformers, has been state of the art for years. In transformer construction, casting resins have the advantage that casting resins on the one hand have high electrical strengths and on the other hand are mechanically very stable in the cured state. However, the problem with the use of casting resins is that the casting resin is liquid and thus difficult to process only in the heated state. Due to the sometimes high temperatures during the cooling process but locally different temperature gradients formed in the casting resin or at the material transitions, such as between the casting resin and embedded in the casting resin aluminum windings, which can lead to mechanical stresses and thus cracks in the casting resin or in the material transitions , Therefore, so far, the thermal stresses are reduced by a targeted and time-consuming cooling of the previously thermally cured Gießharzkörpers (tempering).

Zur Erhöhung der Rissfestigkeit eines Gießharztransformators werden ebenfalls im Stand der Technik dem Gießharz weitere Zusatzstoffe und/oder Füllstoffe zugesetzt. Durch die Einbringung von weiteren Komponenten in den flüssigen Gießharz wird die sich beim Aushärten des flüssigen Gießharzes entstehende Matrixstruktur unterstützt bzw. durch Einlagerung der Komponenten in die Matrix verstärkt.To increase the crack resistance of a cast-resin transformer, further additives and / or fillers are likewise added to the casting resin in the prior art. The incorporation of further components in the liquid casting resin supports the matrix structure arising during the curing of the liquid casting resin or enhances it by incorporating the components into the matrix.

So beschreibt beispielsweise die DE 43 43 121 A1 ein Verfahren zum Herstellen einer Gießkeramik. Gießkeramiken werden aus Wasserglas und einem silizium- und aluminiumhaltigen Pulver hergestellt, was die offene Porosität des Epoxydharzes reduziert. Die Gießkeramik kommt vor allem als elektrischer Isolator zum Einsatz.For example, describes the DE 43 43 121 A1 a method for producing a cast ceramic. Foundry ceramics are made of water glass and a silicon and aluminum containing powder, which reduces the open porosity of the epoxy resin. Casting ceramics are mainly used as electrical insulators.

Des Weiteren offenbart die DE 44 32 188 A1 eine Epoxydharzformmasse, die neben einem phosphormodifiziertem Epoxydharz weitere Zusatzstoffe und anorganische Füllstoffe aufweist. Gemäß der DE 44 32 188 A1 ist die Epoxydharzformmasse technisch einfacher und damit kostengünstiger herstellbar und soll gegenüber bekannten Epoxydharzformmassen eine geringere Wasseraufnahme und höhere Temperaturwechselbeständigkeit aufweisen.Furthermore, the DE 44 32 188 A1 an epoxy resin molding compound, which in addition to a phosphorus-modified epoxy resin further additives and inorganic fillers. According to the DE 44 32 188 A1 the epoxy resin molding composition is technically simpler and thus cheaper to produce and should have a lower water absorption and higher thermal shock resistance compared to known epoxy molding compounds.

Ebenfalls offenbart die DE 102 24 587 A1 eine Vergussmasse, insbesondere zum Herstellen von Formteilen mit darin eingegossenen Einlegeteilen, die aus einer Grundkomponente und wenigstens einem Zusatzstoff bestehen, wobei die Grundkomponente ein Gießharz ist und die Grundkomponente wenigstens zwei Zusatzstoffe, insbesondere Quarzmehl und ein mineralische Fasermaterial, aufweist.Also discloses the DE 102 24 587 A1 a potting compound, in particular for producing molded parts with embedded therein inserts, consisting of a base component and at least one additive, wherein the base component is a casting resin and the base component at least two additives, in particular quartz powder and a mineral fiber material having.

DE 4 217 288 A1 zeigt die Merkmale des Oberbegriffs des Anspruchs 1. DE 4 217 288 A1 shows the features of the preamble of claim 1.

Problematisch an dem bisher im Stand der Technik herstellten Gießharztransformatoren ist, dass sie bei einer hohen elektrischen Belastung oder bei einer gemäß dem Standard IEC600 76 - 11 vorgeschriebenen Kälteschockprüfung Risse, insbesondere an den Materialübergängen, ausbilden. Die Gefahr der Rissbildung ist umso größer, je schneller der Aushärteprozess des Gießharzes während der Herstellung erfolgt. Aus diesem Grunde wurden bisher im Stand der Technik sehr lange Härtezeiten gewählt, damit eine nahezu gleichmäßige Abkühlung aller Komponenten des gesamten Gießharztransformators gewährleistet wird. Der Aushärteprozess bis zum Entfernen der endgültigen Gießform von dem Gießharztransformator dauert daher zum Teil mehr als 30 Stunden.A problem with the casting resin transformers produced hitherto in the state of the art is that they have a high electrical output Load or, in the case of a cold shock test prescribed in accordance with standard IEC600 76 - 11, cracks, especially at the material transitions. The risk of cracking is greater, the faster the curing of the casting resin during manufacture takes place. For this reason, very long curing times have hitherto been chosen in the prior art, so that a virtually uniform cooling of all components of the entire cast-resin transformer is ensured. The curing process until removal of the final casting mold from the cast-resin transformer therefore takes in part more than 30 hours.

Aufgabe der vorliegenden Erfindung ist es daher, den Aushärteprozess während der Herstellung eines Gießharztransformators zu verkürzen.Object of the present invention is therefore to shorten the curing process during the production of a cast-resin transformer.

Hinsichtlich der Lösung der oben genannten Aufgabe wird ein Verfahren zum Herstellen eines rissfesten Gießharztransformators gemäß dem Patentanspruch 1 bereitgestellt. Vorteilhafte Ausgestaltungen sind in den hierauf rückbezogenen Unteransprüchen ausgeführt.With regard to the solution of the above-mentioned object, a method for producing a crack-resistant cast-resin transformer according to claim 1 is provided. Advantageous embodiments are embodied in the subclaims related thereto.

Hinsichtlich des Gießharztransformators wird die Aufgabe erfindungsgemäß durch die Merkmale des Anspruchs 8 gelöst. Vorteilhafte Ausgestaltungen sind Gegenstand der hierauf rückbezogenen Unteransprüche.With regard to the casting resin transformer, the object is achieved by the features of claim 8. Advantageous embodiments are the subject of the dependent claims.

Erfindungsgemäß wird entsprechend dem Verfahren zum Herstellen eines rissfesten Gießharztransformators dem flüssigen Gießharz ein Zähigkeitsmodifikator von bis zu 20 phr im Vergleich zur Grundkomponente des Gießharzes hinzugefügt. Der dem Fachmann geläufige Ausdruck phr ("parts per hundred resin") gibt an, wie viele Gewichtsteile einer Komponente im Gießharz bezogen auf 100 Gewichtsteile des Gießharzes vorhanden sind.According to the invention, according to the method for producing a crack-resistant cast resin transformer, a toughening modifier of up to 20 phr is added to the liquid casting resin in comparison with the base component of the casting resin. The term phr ("parts per hundred resin") known to the person skilled in the art indicates how many parts by weight of a component in the Cast resin based on 100 parts by weight of the casting resin are present.

Zu dieser ersten Komponente wird ein Beschleuniger in einer solchen Konzentration hinzugefügt, dass sich eine Gelierzeit von weniger als 15 Minuten bei 140 °C ergibt, wobei das mit diesen beiden Komponenten angereicherte flüssige Gießharz zum Vergießen des Wicklungskörpers dient und der so vergossene Wicklungskörper zum Aushärten einem linear oder treppenförmig aufsteigenden Temperaturprofil ausgesetzt wird. Exemplarisch hierfür ist das folgende Temperaturprofil, bei dem innerhalb von 4 Stunden das zusammengesetzte flüssige Gießharz kontinuierlich von einer Temperatur von 80°C auf 100 °C erhöht wird. Anschließend wird die Temperatur kontinuierlich auf 130°C gesteigert und anschließend über mehrere Stunden bei dieser Temperatur endgültig ausgehärtet. Eine sonst übliche langsame Abkühlung in den Kühlbereich zur Reduzierungen der thermischen Eigenspannungen (Temperung) ist gemäß dem vorliegenden Verfahren nicht notwendig.To this first component, an accelerator is added in such a concentration that results in a gel time of less than 15 minutes at 140 ° C, wherein the enriched with these two components liquid casting resin for casting of the winding body and the thus-cast winding body for curing one linear or stepped rising temperature profile is exposed. An example of this is the following temperature profile, in which within 4 hours, the composite liquid casting resin is continuously increased from a temperature of 80 ° C to 100 ° C. Subsequently, the temperature is continuously increased to 130 ° C and then finally cured for several hours at this temperature. An otherwise slow cooling in the cooling area for reducing the internal thermal stresses (annealing) is not necessary according to the present method.

Zähigkeitsmodifikatoren sind zur Verbesserung der Temperaturbeständigkeit von Gießharzen bekannt (beispielsweise DE 601 04 449 T2 ). Die Verwendung von Härtungsbeschleunigern (beispielsweise DE 42 06 733 C2 ) beschleunigt die Polymerisation oder Polyaddition die Umwandlung in eine vernetzte Verbundmatrix des sich aushärtenden Gießharzes. Die alleinige bzw. nicht abgestimmte Zugabe von Beschleunigern zu einem flüssigen Gießharz führt gerade zu einer schnellen Aushärtung mit hohen mechanischen Spannungen, die im Falle von häufigen Temperaturwechseln des Gießharztransformators im Betrieb die zu vermeidenden Risse ausbildet.Toughness modifiers are known for improving the temperature resistance of casting resins (for example DE 601 04 449 T2 ). The use of cure accelerators (for example DE 42 06 733 C2 ), the polymerization or polyaddition accelerates conversion to a crosslinked composite matrix of the thermosetting molding resin. The sole or non-coordinated addition of accelerators to a liquid casting resin leads just to a rapid curing with high mechanical stresses, which forms in case of frequent temperature changes of the cast resin transformer during operation, the cracks to be avoided.

Durch den Einsatz von definierten Zähigkeitsmodifikatoren und einer hierauf angepassten Erhöhung der Beschleunigerkonzentration kann die Rissfestigkeit des Gießharzes derartig gesteigert werden, dass hierdurch während des Aushärtprozesses mechanische Spannungen gerade nicht entstehen und damit gleichzeitig die Aushärtezeiten verringert werden können. Insbesondere die Kombination des Zähigkeitsmodifikators mit angepassten Beschleunigerkonzentrationen und einem abgestimmten Aushärteprozess verringert beziehungsweise unterbindet die Rissbildung eines so hergestellten Gießharztransformators.Through the use of defined toughness modifiers and a corresponding increase in the accelerator concentration the crack resistance of the casting resin can be increased in such a way that mechanical stresses just do not arise during the curing process and thus at the same time the curing times can be reduced. In particular, the combination of the toughness modifier with adjusted accelerator concentrations and a co-ordinated curing process reduces or eliminates the cracking of a cast resin transformer thus produced.

Hierdurch ergibt sich zum einen der Vorteil von kürzeren Aushärtezeiten mit entsprechend verringertem Energieaufwand in der Herstellung des Gießharztransformators. Gleichzeitig wird die Lebensdauer eines so hergestellten Gießharztransformators verlängert, da die während des Betriebes entstehenden Temperaturschwankungen keine Risse innerhalb des Gießharztransformators erzeugen.This results in the one hand, the advantage of shorter curing times with a correspondingly reduced energy consumption in the production of Gießharztransformators. At the same time, the life of a cast resin transformer thus produced is prolonged, since the temperature variations arising during operation do not generate cracks within the cast resin transformer.

In einer vorteilhaften Ausgestaltung des Verfahrens ist vorgesehen, dass dem flüssigen Gießharz als Beschleuniger, insbesondere ein tertiäres Amin und/oder eine quarternäre Ammoniumverbindung, zugesetzt wird.In an advantageous embodiment of the method is provided that the liquid casting resin as an accelerator, in particular a tertiary amine and / or a quaternary ammonium compound is added.

Vorteilhafterweise wird das Temperaturprofil während des Härtungsprozesses des flüssigen Gießharzes mittels einer Temperaturverteilung in einem den Wicklungskörper umgebenden Ofen gesteuert.Advantageously, the temperature profile is controlled during the curing process of the liquid casting resin by means of a temperature distribution in a furnace surrounding the winding body.

Vorteilhafterweise wird dem flüssigen Gießharz ein Füllstoff zugesetzt, insbesondere ein mineralisches Quarzmehl. Weiterhin wird dem flüssigen Gießharz bis zu 5 Gewichtsprozent, insbesondere 3 Gewichtsprozent, Glaskurzfasern bezogen auf den Füllstoff zugesetzt, um somit die Verbundmatrix des sich aushärtenden Gießharzes zusätzlich durch die Glaskurzfasern zu verstärken. Hierdurch ergibt sich der Vorteil, dass eine sonst übliche Armierung in Form einer Glasfasermatte oder eines Vlieses an der Innen und/oder Außenseite des Gießharzkörpers nicht notwendig ist.Advantageously, a filler is added to the liquid casting resin, in particular a mineral quartz powder. Furthermore, up to 5 percent by weight, in particular 3 percent by weight, of glass short fibers based on the filler is added to the liquid casting resin, in order in addition to increase the composite matrix of the hardening casting resin by the glass short fibers to reinforce. This has the advantage that an otherwise usual reinforcement in the form of a glass fiber mat or a fleece on the inside and / or outside of the cast resin body is not necessary.

Erfindungsgemäß wird dem Gießharz des Gießharztransformators ein Zähigkeitsmodifikator von bis zu 20 phr zugesetzt. Des Weiteren wird vorteilhafterweise dem Gießharz ein Füllstoff zugesetzt, wobei bezogen auf die Gewichtsprozente des Füllstoffes von bis zu 5 Gewichtsprozente Glaskurzfasern dem Gießharz zugesetzt sind. In einer vorteilhaften Ausgestaltung des Gießharztransformators ist der Füllstoff ein mineralischer Füllstoff, insbesondere ein amorphes Quarzmehl.According to the invention, a toughening modifier of up to 20 phr is added to the casting resin of the cast-resin transformer. Furthermore, a filler is advantageously added to the casting resin, wherein, based on the weight percent of the filler of up to 5 percent by weight glass short fibers are added to the casting resin. In an advantageous embodiment of the cast-resin transformer, the filler is a mineral filler, in particular an amorphous quartz powder.

In einer vorteilhaften Ausgestaltung des Gießharztransformators ist der Beschleuniger insbesondere ein tert. Amin und/oder eine quarternäre Ammoniumverbindung und der Zähigkeitsmodifikator ein Copolymer, insbesondere ein Acrylnitrit oder ein Silikonkautschuk.In an advantageous embodiment of the cast resin transformer, the accelerator is in particular a tert. Amine and / or a quaternary ammonium compound and the toughness modifier, a copolymer, in particular an acrylonitrile or a silicone rubber.

Claims (11)

  1. Method for manufacturing a crack-resistant cast-resin transformer, a cast resin being used for the electrical isolation of a winding body of the cast-resin transformer, a toughness modifier being added to the liquid cast resin and the liquid cast resin composed in this way serving for the casting of the winding body, characterized in that the amount of toughness modifier is up to 20 phr, and the winding body cast in this way is heated with an increasing temperature for curing, and the temperature is increased in the form of a defined temperature profile linearly and/or in a stepped form during the curing of the composed liquid cast resin.
  2. Method according to Claim 1, characterized in that a copolymer, in particular an acrylonitrile copolymer or silicone rubber, is added to the liquid cast resin as the toughness modifier.
  3. Method according to either of Claims 1 and 2, characterized in that the temperature profile is controlled during the hardening process of the composed liquid cast resin by means of a temperature distribution in an oven surrounding the winding body.
  4. Method according to one of Claims 1 to 3, characterized in that an accelerator, in particular a tertiary amine and/or a quaternary ammonia compound, is added to the liquid composed cast resin.
  5. Method according to Claim 4, characterized in that the concentration of the accelerator leads to a curing time of less than 15 minutes at 140°C, and is consequently adapted to the curing process.
  6. Method according to one of Claims 1 to 5, characterized in that a filler is added to the liquid cast resin, up to 5 percent by weight of short glass fibres being added with respect to the percentages by weight of the filler.
  7. Method according to Claim 6, characterized in that a mineral filler, in particular an amorphous silica flour, is added to the liquid cast resin as the filler.
  8. Cast-resin transformer with an electrical isolation, consisting of cast resin, of a winding body of the cast-resin transformer, characterized in that the liquid cast resin contains a toughness modifier of up to 20 phr and the initially liquid cast resin composed in this way has been heated by means of a defined temperature profile rising linearly and/or in a stepped form, and consequently cured in a crack-resistant manner.
  9. Cast-resin transformer according to Claim 8, characterized in that a filler is added to the cast resin, up to 5 percent by weight of short glass fibres being added to the cast resin with respect to the percentages by weight of the filler.
  10. Cast-resin transformer according to either of Claims 8 and 9, characterized in that the filler is a mineral filler, in particular an amorphous silica flour.
  11. Cast-resin transformer according to one of Claims 8 to 10, characterized in that the composed liquid cast resin comprises an accelerator, in particular a tertiary amine and/or a quaternary ammonia compound, and the toughness modifier is a copolymer, in particular an acrylonitrile or silicone rubber.
EP09161058.4A 2008-05-27 2009-05-26 Method for manufacturing a tear-proof resin transformer and tear-proof resin transformer Active EP2154698B1 (en)

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DE102008025541A DE102008025541A1 (en) 2008-05-27 2008-05-27 Method for producing a crack-resistant cast-resin transformer and crack-resistant cast-resin transformer

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EP2154698A2 EP2154698A2 (en) 2010-02-17
EP2154698A3 EP2154698A3 (en) 2012-08-29
EP2154698B1 true EP2154698B1 (en) 2013-11-06

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DE (1) DE102008025541A1 (en)
ES (1) ES2442442T3 (en)
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DE1100113B (en) * 1955-08-23 1961-02-23 Westinghouse Electric Corp Insulating material for electrotechnical purposes
US4665111A (en) * 1984-10-12 1987-05-12 Siemens Aktiengesellschaft Casting compound for electrical and electronic components and modules
JP2524011B2 (en) * 1991-05-23 1996-08-14 株式会社日立製作所 Thermosetting resin composition for high-voltage coil casting, mold coil and panel obtained by casting and curing with the composition
DE4206733C2 (en) 1992-03-04 1998-09-03 Bakelite Ag Cast resin and its use in the manufacture of electro-potting compounds
DE4343121A1 (en) 1993-12-17 1995-06-22 Abb Patent Gmbh Process for producing a casting ceramic
DE4432188A1 (en) 1994-09-09 1996-03-14 Siemens Ag Halogen-free epoxy resin compsn. for electronics encapsulation
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US6198373B1 (en) * 1997-08-19 2001-03-06 Taiyo Yuden Co., Ltd. Wire wound electronic component
JP4002831B2 (en) 2000-11-29 2007-11-07 ハンツマン アドバンスト マテリアルズ （スイッツァランド） ゲーエムベーハー Filled epoxy resin system with high mechanical strength
DE10224587A1 (en) 2002-06-04 2003-12-18 Abb Patent Gmbh Sealing compound for the preparation of molded parts containing inserted parts useful in production of insulating materials with metallic and/or ceramic and or complex profile and/or mechanically sensitive inserted parts
DE10252435A1 (en) * 2002-11-12 2004-05-27 Abb Technology Ag Oven-hardening of coils rotated to prevent resin from dripping-off, passes direct current through coil conductors to cause heating
DE102004054527B4 (en) * 2004-11-05 2006-10-12 Siemens Ag Process for the preparation of an isolated conductor of an insulated conductor and release agent

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EP2154698A2 (en) 2010-02-17
PT2154698E (en) 2013-11-22
DE102008025541A1 (en) 2009-12-17
ES2442442T3 (en) 2014-02-11
PL2154698T3 (en) 2014-04-30
EP2154698A3 (en) 2012-08-29

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