EP0172494A1 - Method for manufacturing epoxy resin-embedded windings for transformers - Google Patents

Method for manufacturing epoxy resin-embedded windings for transformers Download PDF

Info

Publication number
EP0172494A1
EP0172494A1 EP85109937A EP85109937A EP0172494A1 EP 0172494 A1 EP0172494 A1 EP 0172494A1 EP 85109937 A EP85109937 A EP 85109937A EP 85109937 A EP85109937 A EP 85109937A EP 0172494 A1 EP0172494 A1 EP 0172494A1
Authority
EP
European Patent Office
Prior art keywords
casting
mold
twisted
threads
coils
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
EP85109937A
Other languages
German (de)
French (fr)
Other versions
EP0172494B1 (en
Inventor
Gerhard Dipl.-Ing. Altmann
Wolfgang Bendel
Rudolf Dedelmahr
Richard Dr. Dipl.-Ing. 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.)
Siemens AG
Original Assignee
Transformatoren Union AG
Siemens 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, Siemens AG filed Critical Transformatoren Union AG
Priority to AT85109937T priority Critical patent/ATE35746T1/en
Publication of EP0172494A1 publication Critical patent/EP0172494A1/en
Application granted granted Critical
Publication of EP0172494B1 publication Critical patent/EP0172494B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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.
  • This known method also ver windings from coils lying one behind the other in the axial direction pour, the casting preferably in a lying shape in an evacuated chamber through an axially parallel slot in the outer jacket of the casting mold and then the curing of the casting resin composition takes place at least partially in the mold itself at elevated temperature and at atmospheric or higher pressure.
  • corrugated spacers have proven to be relatively complex since a large number of special tools is still required for the large number of required shaft dimensions. They also occur when using this corrugated spacers also relatively large, undesirable shifts in the circumferential direction between the coils of the winding on the one hand and on the other hand individual wave crests of the spacers.
  • the invention is therefore based on the object to improve the method known from DE-OS 32 34 098 so that displacements of the spacers relative to the coils and damage to the insulation of the coils which may be caused thereby are avoided and that the economy is achieved by further reducing the number of the required special tools is further increased.
  • the distance between some of the untwisted glass fiber bundles remains equal to the multiple of the width of these glass fiber bundles and that in the insulating mats used, two adjacent warp threads are pushed against each other at their crossing point with a weft thread by one of the twisted threads, in that the twisted thread crosses all the weft threads on the same side of the fabric opposite the warp thread pushed by it at the respective crossing point and in that the twisted thread on the other side of the fabric leads back and forth between these crossing points.
  • the method according to the invention is very advantageous since it enables the production of transformer windings cast in cast resin that is as economical as it is easily adaptable to different boundary conditions, because the thickened portions pushed together by the individual, twisted, shrunk threads from the untwisted, loose glass fiber bundles through the hardened impregnating resin composition What is certain is that they reliably hold the coils in the casting mold, but on the other hand, as a result of their loose structure, they can be compressed before the windings are overloaded.
  • 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 insulating mats made of woven fabric made of untwisted, loose glass fiber bundles 15 and 16 impregnated with curable synthetic resin.
  • the glass fiber bundles represent 15 warp threads and the glass fiber bundles 16 weft threads in the fabric. In this fabric there are zigzags Lines strongly twisted threads 17 made of shrinkable synthetic resin are incorporated.
  • the insulating material mats can also be made from bundles of other electrically non-conductive fibers.
  • the fabric is pre-cut and used as a spacer, for example by heating men, treated so that the resin introduced by the impregnation is finally and completely cured and that at the same time the twisted threads 17 shrink.
  • the glass fiber bundles 15 and 16 are pushed together in the corner points of the zigzag lines to form thickenings which, although very hard, give way more than the coils 1 as a result of a certain remaining porosity under a pressure load.
  • two glass fiber bundles 15 representing warp threads are each pressed together by a thread 17 and form a thickening at each intersection with a glass fiber bundle 16 representing a weft thread, this thickening being greater than it would be in simple fabric without shrunken threads 17 .
  • An inner shell 5 of a casting mold is pressed against the thickened portions of 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 on 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 spread with slight deformation of the inner spacer 2 regardless of diameter tolerances to such an extent that the thickness of the gap to be filled with casting resin is to be expected during operation withstands the electrical and / or mechanical stress of the cast resin molding material. Based on this, the dimensioning of the inner spacer 2, in particular with its thickenings, is designed with regard to the mechanical load to be expected. At higher nominal voltages, it is often expedient to provide a plurality of insulating mats radially one above the other as spacers 2 and / or 3 instead of a single insulating mat in a manner not shown.
  • Bandages, not shown, placed around the outer spacer 3 contribute to a further increase in the mechanical strength of the cast resin body in the circumferential direction. These bandages also make it possible to set the thickness of the gap held by the outer spacer 3 independently of the diameter tolerances on the coils 1.
  • an outer jacket 6 of a casting mold is placed, which is essentially based on the thickening of the supports outer spacer 3 or on 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 opposite or offset at a certain angle from the bulge 7, which is flanked by wall strips 9 which are bent approximately in the radial direction and at the same time serves as a vent and as a pouring opening of 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 pressed with their layer 11 by an anchor plate 13 so strongly against the end edges of the inner casing 5 and the outer casing 6 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 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 out with pure epoxy resin or with an epoxy resin mixture containing up to 75% filler. Depending on the prevailing conditions, the shape, the coils 1 and / or the cast resin composition are preheated.
  • the casting mold Following the filling of the casting mold with casting resin compound, the latter is exposed to atmospheric pressure or a higher pressure, so that the excess casting resin compound from the funnel formed by the wall strips 9 is pressed into the casting mold until the casting resin body has completely solidified.

Landscapes

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

Abstract

1. Method for manufacturing coils, embedded in cast resin, for transformers, - according to which, spools (1), lying one behind another in the axial direction, of the coil are wound each for itself and independently of one another, - according to which, one insulating material mat respectively, serves, in a radial direction, as a brace (2, 3) between an inner casing (5) of the casting mould and the spools (1), as well as between the spools (1) and an outer casing (6) of the casting mould, - according to which, the spools (1) are fixed in an axial direction by frictional contact on the inner brace (2), - according to which, the inner (5) and the outer casing (6) of the casting mould are fixed between mould en walls (10), - according to which, casting with a horizontal mould in an evacuated chamber, follows through a slit (8), parallel to the axis, in the outer casing (6) of the casting mould, and - according to which, the hardening of the cast resin mass follows, at least partly, in the mould with increased temperature and with atmospheric or higher pressure, characterised in that, - the insulating material mats comprise fabric of non-twisted loose glass fibre bundles (15, 16), crossed and impregnated with hardenable artificial resin, - individual threads (17), twisted in themselves, of shrinkable artificial resin are worked into this fabric along zig-zag lines lying substantially in the fabric plane, - the twisted threads (17) in the insulating material mat shrink, during the hardening of the artificial resin mass, introduced through the impregnating, before the insulating materiel mat is brought into the casting mould, and telescope the glass fibre bundles (15, 16) at their intersections, lying in the points of the zig-zag line, to form knotlike swellings, and in that, - these swellings clamp the spools (1) in the casting mould.

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 der eingesetzten Werkstoffe, insbesondere der Menge des eingesetzten Gießharzes, steigende wirtschaftliche Bedeutung. Aus diesem Grund wird eine gleich gute Ausnutzung der vorteilhaften elektrischen und der ebenso vorteilhaften mechanischen Eigenschaften des Gießharzformstoffes angestrebt. Dabei bringen kleine Wanddicken des Gießharzkörpers zusätzlich thermische Vorteile, so daß die Leistungsgrenze bis zu der mit Gießharz umgossene Transformatorwicklungen ausführbar sind, gesteigert werden kann.With the increasing use of cast resin transformers, the optimization of the materials used, in particular the amount of cast resin used, is becoming increasingly important. For this reason, an equally good exploitation of the advantageous electrical and the equally advantageous mechanical properties of the cast resin molding material is sought. Small wall thicknesses of the cast resin body bring additional thermal advantages, so that the power limit up to which the transformer windings can be cast with cast resin can be increased.

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 dieses bekannte Verfahren werden auch Wicklungen aus in Achsrichtung hintereinander liegenden 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.This known method also ver windings from coils lying one behind the other in the axial direction pour, the casting preferably in a lying shape in an evacuated chamber through an axially parallel slot in the outer jacket of the casting mold and then the curing 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 teueren 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. Zur Verringerung der Anzahl der erforderlichen Hilfswerkzeuge und zur annähernden Ausnutzung der elektrischen und mechanischen Belastbarkeit der Gießharzkörper ist es durch die DE-OS 32 34 098 bekannt, die radiale Höhe eines gewellten und imprägnierten innenliegenden Abstandshalters durch bleibende Verformung bis auf das Sollmaß der Gießharzkörperwanddicke zu verkleinern, indem ein innerer Mantel der Gießform in radialer Richtung gespreizt wird, wobei seine sich in Umfangsrichtung überlappenden achsparallelen Ränder aufeinander gleiten.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 strength of the cast resin body is often not fully utilized. In order to reduce the number of auxiliary tools required and to approximately utilize the electrical and mechanical load capacity of the cast resin body, it is known from DE-OS 32 34 098 to reduce the radial height of a corrugated and impregnated inner spacer by permanent deformation to the desired dimension of the cast resin body wall thickness by spreading an inner jacket of the casting mold in the radial direction, its axially parallel edges overlapping in the circumferential direction sliding on one another.

Die Herstellung der gewellten Abstandshalter hat sich jedoch als verhältnismäßig aufwendig erwiesen, da für die Vielzahl von erforderlichen Wellenabmessungen noch immer eine Vielzahl von Sonderwerkzeugen erforderlich ist. Darüber hinaus treten bei der Verwendung dieser gewellten Abstandshalter auch relativ große, unerwünschte Verschiebungen in Umfangsrichtung zwischen den Spulen der Wicklung einerseits und andererseits einzelnen Wellenbergen der Abstandshalter auf.However, the production of the corrugated spacers has proven to be relatively complex since a large number of special tools is still required for the large number of required shaft dimensions. They also occur when using this corrugated spacers also relatively large, undesirable shifts in the circumferential direction between the coils of the winding on the one hand and on the other hand individual wave crests of the spacers.

Der Erfindung liegt daher die Aufgabe zugrunde, das durch die DE-OS 32 34 098 bekannte Verfahren so zu verbessern, daß Verschiebungen der Abstandshalter gegenüber den Spulen und dadurch möglicherweise verursachte Beschädigungen der Isolierung der Spulen vermieden sind und daß die Wirtschaftlichkeit durch weitere Senkung der Zahl der erforderlichen Sonderwerkzeuge weiter erhöht ist.The invention is therefore based on the object to improve the method known from DE-OS 32 34 098 so that displacements of the spacers relative to the coils and damage to the insulation of the coils which may be caused thereby are avoided and that the economy is achieved by further reducing the number of the required special tools is further increased.

Erfindungsgemäß wird diese Aufgabe bei der Durchführung des eingangs genannten Verfahrens dadurch gelöst,

  • - daß die als Abstandshalter eingesetzten Isolierstoffmatten aus Gewebe aus unverdrillten, lockeren, mit aushärtbarem Kunstharz getränkten Glasfaserbündeln bestehen,
  • - daß einzelne in sich verdrillte Fäden aus schrumpffähigem Kunstharz entlang von im wesentlichen in der Gewebeebene liegenden Zick-Zack-Linien in dieses Gewebe eingearbeitet sind,
  • - daß die verdrillten Fäden in der Isolierstoffmatte während der Aushärtung der durch die Tränkung eingebrachten Kunstharzmasse vor dem Einbringen der Isolierstoffmatte in die Gießform schrumpfen und die Glasfaserbündel an deren in Spitzen der Zick-Zack-Linie liegenden Kreuzungsstellen zu knotenähnlichen Verdickungen zusammenschieben und
  • - daß diese Verdickungen die die Transformatorwicklungen darstellenden Spulen in der Gießform einklemmen.
According to the invention, this object is achieved when the method mentioned at the outset is carried out by
  • - that the insulating material mats used as spacers are made of untwisted, loose glass fiber bundles impregnated with hardenable synthetic resin,
  • individual twisted threads made of shrinkable synthetic resin are worked into this fabric along zigzag lines lying essentially in the plane of the fabric,
  • - That the twisted threads in the insulating mat during the curing of the synthetic resin mass introduced by the impregnation shrink before inserting the insulating mat into the mold and push the glass fiber bundles together at their intersection points in the zigzag line to form knot-like thickenings and
  • - That these thickenings pinch the coils representing the transformer windings in the mold.

Gemäß vorteilhaften Ausgestaltungsmerkmalen der Erfindung ist vorgesehen, daß der Abstand zwischen einigen der unverdrillten Glasfaserbündel gleich dem Mehrfachen der Breite dieser Glasfaserbündel bleibt und daß in den verwendeten Isolierstoffmatten je zwei einander benachbarte Kettfäden jeweils an ihrer Kreuzungsstelle mit einem Schußfaden durch einen der verdrillten Fäden gegeneinandergeschoben sind, indem der verdrillte Faden alle Schußfäden auf derselben, dem an der jeweiligen Kreuzungsstelle von ihm geschobenen Kettfaden gegenüberliegenden Gewebeseite kreuzt und indem der verdrillte Faden auf der anderen Gewebeseite zwischen diesen Kreuzungsstellen hin- beziehungsweise hergeführt ist.According to advantageous design features of the invention, it is provided that the distance between some of the untwisted glass fiber bundles remains equal to the multiple of the width of these glass fiber bundles and that in the insulating mats used, two adjacent warp threads are pushed against each other at their crossing point with a weft thread by one of the twisted threads, in that the twisted thread crosses all the weft threads on the same side of the fabric opposite the warp thread pushed by it at the respective crossing point and in that the twisted thread on the other side of the fabric leads back and forth between these crossing points.

Weitere vorteilhafte Ausgestaltungsmerkmale der Erfindung bestehen darin, daß die Isolierstoffmatten die Wicklung an beiden Enden in Achsrichtung überragen, daß als Gießharz gefülltes oder ungefülltes Epoxydharz verwendet ist und daß die Gießform und/oder die Wicklung vorgeheizt werden, wobei die durch die Tränkung in die Isolierstoffmatten eingebrachte, bereits ausgehärtete Kunstharzmasse fest bleibt.Further advantageous features of the invention consist in the fact that the insulating mats protrude beyond the winding at both ends in the axial direction, that epoxy resin filled or unfilled is used as the casting resin and that the casting mold and / or the winding are preheated, the impregnation introduced into the insulating mats , already hardened synthetic resin compound remains firm.

Das erfindungsgemäße Verfahren ist sehr vorteilhaft, da es eine ebenso wirtschaftliche wie leicht an unterschiedliche Randbedingungen anpaßbare Herstellung von in Gießharz eingegossenen Transformatorwicklungen ermöglicht, weil die von den einzelnen, verdrillten, geschrumpften Fäden zusammengeschobenen Verdickungen aus den unverdrillten, lockeren Glasfaserbündeln durch die ausgehärtete Tränkharzmasse einerseits so fest sind, daß sie die Spulen in der Gießform zuverlässig festhalten, andererseits jedoch in Folge ihres lockeren Aufbaus vor einer Überlastung der Wicklungen in sich zusammendrückbar sind.The method according to the invention is very advantageous since it enables the production of transformer windings cast in cast resin that is as economical as it is easily adaptable to different boundary conditions, because the thickened portions pushed together by the individual, twisted, shrunk threads from the untwisted, loose glass fiber bundles through the hardened impregnating resin composition What is certain is that they reliably hold the coils in the casting mold, but on the other hand, as a result of their loose structure, they can be compressed before the windings are overloaded.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert. Dabei zeigt:

  • Fig. 1 einen Quer- und
  • Fig. 2 einen achsparallelen Längsschnitt durch eine zum Umgießen vorgesehene Transformatorwicklung in stark verkleinertem Maßstab.
  • Fig. 3 zeigt ein als Isolierstoffmatte vorgesehenes Gewebe aus unverdrillten Glasfaserbündeln in annähernd natürlicher Größe.
An embodiment of the invention is explained in more detail with reference to a drawing. It shows:
  • Fig. 1 is a cross and
  • Fig. 2 shows an axially parallel longitudinal section through a transformer winding intended for casting around on a greatly reduced scale.
  • Fig. 3 shows a fabric provided as an insulating mat made of untwisted glass fiber bundles in approximately natural size.

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.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.

Die Abstandshalter 2 und 3 bestehen ihrerseits aus Isolierstoffmatten aus Gewebe aus unverdrillten, lockeren, mit aushärtbarem Kunstharz getränkten Glasfaserbündeln 15 und 16. Dabei stellen in dem Gewebe die Glasfaserbündel 15 Kettfäden und die Glasfaserbündel 16 Schußfäden dar. In dieses Gewebe sind entlang von Zick-Zack-Linien stark verdrillte Fäden 17 aus schrumpffähigem Kunstharz eingearbeitet.The spacers 2 and 3 in turn consist of insulating mats made of woven fabric made of untwisted, loose glass fiber bundles 15 and 16 impregnated with curable synthetic resin. The glass fiber bundles represent 15 warp threads and the glass fiber bundles 16 weft threads in the fabric. In this fabric there are zigzags Lines strongly twisted threads 17 made of shrinkable synthetic resin are incorporated.

Die Isolierstoffmatten können anstelle von Glasfaserbündeln auch aus Bündeln von anderen elektrisch nicht leitenden Fasern hergestellt sein.Instead of glass fiber bundles, the insulating material mats can also be made from bundles of other electrically non-conductive fibers.

Das Gewebe wird vor dem Zuschneiden und vor seiner Verwendung als Abstandshalter, beispielsweise durch Erwärmen, so behandelt, daß das durch die Tränkung eingebrachte Kunstharz endgültig und vollständig ausgehärtet ist und daß dabei gleichzeitig die verdrillten Fäden 17 schrumpfen. Dadurch werden die Glasfaserbündel 15 und 16 in den Eckpunkten der Zick-Zack-Linien zu Verdickungen zusammengeschoben, die zwar sehr hart sind, aber in Folge einer gewissen verbleibenden Porosität bei einer Druckbelastung wesentlich mehr nachgeben als die Spulen 1.The fabric is pre-cut and used as a spacer, for example by heating men, treated so that the resin introduced by the impregnation is finally and completely cured and that at the same time the twisted threads 17 shrink. As a result, the glass fiber bundles 15 and 16 are pushed together in the corner points of the zigzag lines to form thickenings which, although very hard, give way more than the coils 1 as a result of a certain remaining porosity under a pressure load.

Beim in Fig. 3 dargestellten Gewebebeispiel sind jeweils zwei Kettfäden darstellende Glasfaserbündel 15 durch je einen Faden 17 aneinandergedrückt und bilden an jeder Kreuzungsstelle mit einem einen Schußfaden darstellenden Glasfaserbündel 16 eine Verdickung, wobei diese Verdikkung stärker ist als sie im einfachen Gewebe ohne geschrumpfte Fäden 17 wäre.In the fabric example shown in FIG. 3, two glass fiber bundles 15 representing warp threads are each pressed together by a thread 17 and form a thickening at each intersection with a glass fiber bundle 16 representing a weft thread, this thickening being greater than it would be in simple fabric without shrunken threads 17 .

An die Verdickungen der 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 auf 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 Rollen angebracht.An inner shell 5 of a casting mold is pressed against the thickened portions of 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 on 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 leichter 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, insbesondere mit seinen Verdickungen, im Hinblick auf die zu erwartende mechanische Belastung ausgelegt. Bei höheren Nennspannungen ist es häufig zweckmässig, anstelle einer einzigen Isolierstoffmatte in nicht dargestellter Weise mehrere Isolierstoffmatten radial übereinander als Abstandshalter 2 und/oder 3 vorzusehen.The inner jacket 5 is spread with slight deformation of the inner spacer 2 regardless of diameter tolerances to such an extent that the thickness of the gap to be filled with casting resin is to be expected during operation withstands the electrical and / or mechanical stress of the cast resin molding material. Based on this, the dimensioning of the inner spacer 2, in particular with its thickenings, is designed with regard to the mechanical load to be expected. At higher nominal voltages, it is often expedient to provide a plurality of insulating mats radially one above the other as spacers 2 and / or 3 instead of a single insulating mat in a manner not shown.

Außen um den äußeren Abstandshalter 3 herumgelegte, nicht dargestellte Bandagen tragen zur weiteren Erhöhung der mechanischen Festigkeit des Gießharzkörpers in Umfangsrichtung bei. Durch diese Bandagen ist es darüber hinaus möglich, die Stärke des von dem äußeren Abstandshalter 3 offengehaltenen Spaltes unabhängig von Durchmessertoleranzen an den Spulen 1 einzustellen.Bandages, not shown, placed around the outer spacer 3 contribute to a further increase in the mechanical strength of the cast resin body in the circumferential direction. These bandages also make it possible to set the thickness of the gap held by the outer spacer 3 independently of the diameter tolerances on the coils 1.

Um die Wicklungsanordnungen 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 den Verdickungen des äußeren Abstandshalters 3 bzw. an den diesen umfassenden Bandagen abstützt. In dem äußeren Mantel 6 ist eine achsparallele Ausbuchtung 7 vorgesehen, die am Gießharzkörper eine Verstärkung zur Aufnahme der Wicklungsausleitungen und -anschlußkontakte formt. Gegenüber oder in einem bestimmten Winkel versetzt von der Ausbuchtung 7 ist ein Schlitz 8 vorgesehen, der von in etwa in radialer Richtung abgekanteten Wandstreifen 9 flankiert ist und gleichzeitig als Entlüftungs- und als Eingußöffnung der Gießform dient.Around the winding arrangements of the coils 1, the inner spacer 2 and the inner jacket 5 spread from the inside against them, and the outer spacer 3 bandaged from the outside around the coils 1, an outer jacket 6 of a casting mold is placed, which is essentially based on the thickening of the supports outer spacer 3 or on 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. A slot 8 is provided opposite or offset at a certain angle from the bulge 7, which is flanked by wall strips 9 which are bent approximately in the radial direction and at the same time serves as a vent and as a pouring opening of the casting mold.

Die Stirnflächen 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 pressed with their layer 11 by an anchor plate 13 so strongly against the end edges of the inner casing 5 and the outer casing 6 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 % Füllstoff aufweisenden Epoxydharzgemisch ausgegossen. Dabei sind je nach den vorliegenden Verhältnissen die Form, die Spulen 1 und/oder die Gießharzmasse vorgewärmt.The arrangement of coils 1, the inner spacer 2 and the outer spacer 3 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 out with pure epoxy resin or with an epoxy resin mixture containing up to 75% filler. Depending on the prevailing conditions, the shape, the coils 1 and / or the cast resin composition are preheated.

Im Anschluß an das Füllen der Gießform mit Gießharzmasse wird diese dem atmosphärischen Druck oder einem höheren Druck ausgesetzt, so daß der aus dem von den Wandstreifen 9 gebildeten Trichter vorhandene Gießharzmasseüberschuß bis zur vollständigen Erstarrung des Gießharzkörpers Gießharzmasse in die Gießform nachgedrückt wird.Following the filling of the casting mold with casting resin compound, the latter is exposed to atmospheric pressure or a higher pressure, so that the excess casting resin 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 (6)

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 je eine Isolierstoffmatte in radialer Richtung als Abstandshalter (2, 3) zwischen einem inneren Mantel (5) der Gießform und den Spulen (1) sowie zwischen den Spulen (1) und einem äußeren Mantel (6) der Gießform dient, - wonach die Spulen (1) durch Kraftschluß in Achsrichtung auf dem innenliegenden Abstandshalter (2) fixiert sind, - 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 höherem Druck erfolgt, adurch gekennzeichnet, - daß die Isolierstoffmatten aus Gewebe aus unverdrillten, lockeren, mit aushärtbarem Kunstharz getränkten Glasfaserbündeln (15, 16) bestehen, - daß einzelne, in sich verdrillte Fäden (17) aus schrumpffähigem Kunstharz entlang von im wesentlichen in der Gewebeebene liegenden Zick-Zack-Linien in dieses Gewebe eingearbeitet sind, - daß die verdrillten Fäden (17) in der Isolierstoffmatte während der Aushärtung der durch die Tränkung eingebrachten Kunstharzmasse vor dem Einbringen der Isolierstoffmatte in die Gießform schrumpfen und die Glasfaserbündel (15, 16) an deren in den Spitzen der Zick-Zack-Linie liegenden Kreuzungsstellen zu knotenähnlichen Verdickungen zusammenschieben und - daß diese Verdickungen die Spulen (1) in der Gießform einklemmen. 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 - According to which an insulating mat serves in the radial direction as a spacer (2, 3) between an inner jacket (5) of the casting mold and the coils (1) and between the coils (1) and an outer jacket (6) of the casting mold, - After which the coils (1) are fixed by force locking in the axial direction on the inner spacer (2), - 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 casting resin composition is at least partially cured in the mold at elevated temperature and at atmospheric or higher pressure, characterized by - that the insulating material mats made of fabric consist of untwisted, loose glass fiber bundles (15, 16) soaked with curable synthetic resin, - That individual, twisted threads (17) made of shrinkable synthetic resin are worked into this fabric along zigzag lines lying essentially in the plane of the fabric, - That the twisted threads (17) in the insulating mat during the curing of the impregnation Shrink the introduced synthetic resin mass before inserting the insulating mat into the mold and push the glass fiber bundles (15, 16) together at their intersection points in the tips of the zigzag line to form knot-like thickenings and - That these thickenings clamp the coils (1) in the mold. 2. Verfahren nach Anspruch 1, dadurch ge- kennzeichnet, daß der Abstand zwischen nicht von den Fäden (17) zusammengeschobenen, unverdrillten Glasfaserbündeln (15, 16) gleich dem Mehrfachen der Breite dieser Glasfaserbündel (15, 16) bleibt.2. The method according to claim 1, characterized in that the distance between the threads (17) not pushed together, untwisted glass fiber bundles (15, 16) remains equal to a multiple of the width of this glass fiber bundle (15, 16). 3. Verfahren nach Anspruch 1 und 2, adurch gekennzeichnet , daß in den verwendeten Isolierstoffmatten je zwei einander benachbarte Kettfäden (15) jeweils an ihrer Kreuzungsstelle mit einem Schußfaden (16) durch einen der verdrillten Fäden (17) gegeneinandergeschoben sind, indem der verdrillte Faden (17) alle Schußfäden (16) auf derselben, dem an der jeweiligen Kreuzungsstelle von ihm geschobenen Kettfaden (15) gegenüberliegenden Gewebeseite kreuzt und indem der verdrillte Faden (17) auf der anderen Gewebeseite zwischen diesen Kreuzungsstellen hin- beziehungsweise hergeführt ist.3. The method according to claim 1 and 2, characterized in that in the insulating mats used two adjacent warp threads (15) are pushed against each other at their intersection with a weft thread (16) by one of the twisted threads (17) by the twisted thread (17) all weft threads (16) on the same, the opposite side of the warp thread (15) pushed by him at the respective crossing point, and by the twisted thread (17) on the other side of the fabric leading between these crossing points. 4. Verfahren nach Anspruch 1 bis 3, adurch ekennzeichnet, daß die Abstandshalter (2, 3) darstellenden Isolierstoffmatten die Wicklung an beiden Enden in Achsrichtung überragen.4. The method according to claim 1 to 3, eurcharged that the spacers (2, 3) insulating mats protrude beyond the winding at both ends in the axial direction. 5. Verfahren nach Anspruch 1 bis 4, dadurch ekennzeichnet, daß als Gießharz mit Quarzmehl gefülltes oder reines Epoxydharz verwendet wird.5. The method according to claim 1 to 4, characterized in that as a casting resin Quartz flour filled or pure epoxy resin is used. 6. Verfahren nach einem der Ansprüche 1 bis 5, da- durch gekennzeichnet, daß die Gießharzform und/oder die Wicklung vorgeheizt werden und daß die durch die Tränkung in die Isolierstoffmatten eingebrachte Kunstharzmasse in Folge vorheriger Aushärtung dabei fest bleibt.6. The method according to any one of claims 1 to 5, characterized in that the casting resin mold and / or the winding are preheated and that the synthetic resin mass introduced by the impregnation into the insulating material mats remains firm as a result of previous curing.
EP85109937A 1984-08-20 1985-08-07 Method for manufacturing epoxy resin-embedded windings for transformers Expired EP0172494B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85109937T ATE35746T1 (en) 1984-08-20 1985-08-07 PROCESS FOR MANUFACTURING TRANSFORMER WINDINGS EMBEDDED IN CAST RESIN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843430586 DE3430586A1 (en) 1984-08-20 1984-08-20 METHOD FOR PRODUCING WINDINGS EMBEDDED IN CASTING RESIN FOR TRANSFORMERS
DE3430586 1984-08-20

Publications (2)

Publication Number Publication Date
EP0172494A1 true EP0172494A1 (en) 1986-02-26
EP0172494B1 EP0172494B1 (en) 1988-07-13

Family

ID=6243467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109937A Expired EP0172494B1 (en) 1984-08-20 1985-08-07 Method for manufacturing epoxy resin-embedded windings for transformers

Country Status (5)

Country Link
EP (1) EP0172494B1 (en)
KR (1) KR920010357B1 (en)
AT (1) ATE35746T1 (en)
BR (1) BR8503952A (en)
DE (2) DE3430586A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10255564A1 (en) * 2002-09-30 2004-04-08 Siemens Ag Casting mold for cylindrical cast resin coils
DE10248782A1 (en) * 2002-09-30 2004-04-15 Siemens Ag Casting mold for cylindrical cast resin coils
CN112652477A (en) * 2020-12-14 2021-04-13 山东电力设备有限公司 Full-automatic bonding method for coil oil duct filler strip

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4426138C2 (en) * 1994-07-22 1998-04-23 Siemens Ag Casting mold for a transformer coil with the possibility of checking the potting
KR100310150B1 (en) * 1999-07-26 2001-09-29 윤종용 Resin molding method for a coil used in a transformer of a microwave oven

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031576A1 (en) * 1979-12-28 1981-07-08 Fuji Electric Co. Ltd. Method of casting-in an electrical appliance
EP0103237A2 (en) * 1982-09-14 1984-03-21 Transformatoren Union Aktiengesellschaft Method of making resin-encapsulated coils for transformers
EP0107802A2 (en) * 1982-10-01 1984-05-09 Smit Transformatoren B.V. Method of manufacturing a resin encapsulated wire or foil type coil, and winding material employed in this method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031576A1 (en) * 1979-12-28 1981-07-08 Fuji Electric Co. Ltd. Method of casting-in an electrical appliance
EP0103237A2 (en) * 1982-09-14 1984-03-21 Transformatoren Union Aktiengesellschaft Method of making resin-encapsulated coils for transformers
EP0107802A2 (en) * 1982-10-01 1984-05-09 Smit Transformatoren B.V. Method of manufacturing a resin encapsulated wire or foil type coil, and winding material employed in this method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10255564A1 (en) * 2002-09-30 2004-04-08 Siemens Ag Casting mold for cylindrical cast resin coils
DE10248782A1 (en) * 2002-09-30 2004-04-15 Siemens Ag Casting mold for cylindrical cast resin coils
DE10248782B4 (en) * 2002-09-30 2005-08-04 Siemens Ag Casting mold for cylindrical cast resin coils
DE10255564B4 (en) * 2002-09-30 2005-10-27 Siemens Ag Casting mold for cylindrical cast resin coils
CN112652477A (en) * 2020-12-14 2021-04-13 山东电力设备有限公司 Full-automatic bonding method for coil oil duct filler strip
CN112652477B (en) * 2020-12-14 2022-08-16 山东电力设备有限公司 Full-automatic bonding method for coil oil duct filler strip

Also Published As

Publication number Publication date
ATE35746T1 (en) 1988-07-15
EP0172494B1 (en) 1988-07-13
DE3563802D1 (en) 1988-08-18
BR8503952A (en) 1986-06-03
DE3430586A1 (en) 1986-02-27
KR920010357B1 (en) 1992-11-27
KR860002121A (en) 1986-03-26

Similar Documents

Publication Publication Date Title
EP0103237B1 (en) Method of making resin-encapsulated coils for transformers
DE69909604T2 (en) AMORPHOUS METAL TRANSFORMER WITH RECTANGULAR COIL
EP0030338B1 (en) Insulated electric conductor for windings of transformers and reactive coils
DE1280390B (en) Method for maintaining a defined space between two adjacent rod-shaped conductors
EP0379012B1 (en) Method for manufacturing the stator of a large electric machine
EP0774823A1 (en) Conductor bar for electric machine
EP0576418B1 (en) Process for producing cast resin coils and cast resin coils thus produced
EP0172494B1 (en) Method for manufacturing epoxy resin-embedded windings for transformers
DE1564042C3 (en) Cross-wound bobbin
DE2706719A1 (en) METHOD OF MANUFACTURING AN ORTHOCYCLIC COIL
DE3537142C2 (en)
DE2328652A1 (en) Dry transformer coil with epoxy resin insulation - has cooling channels formed during winding in soft insulation between coil layers
EP2274754B1 (en) Dry-type transformer
DE3012496A1 (en) BY BAKING THE WINDED WINDING WIRE WITH A BAKE-ENDABLE DEPOT MATERIAL REINFORCED COIL WINDING
EP0092018B1 (en) Reactor, particularly air isolated reactor without magnetic core
DE4445423B4 (en) Method for producing windings for a dry-type transformer
WO1989007325A1 (en) Process for making an iron body with a winding for generating electromagnetic fields
CH425983A (en) Process for fixing the conductors and coils of end windings of electrical machines and electrical machine manufactured according to the process
DE3337954A1 (en) INSULATING CYLINDER FOR HIGH DIELECTRIC LOADS
EP0048384B1 (en) Winding for dry-type transformers
DE2153958C3 (en) Arrangement for distancing and fixing the position of the bars and coils in the winding head of an electrical machine
DE1613441A1 (en) Method and device for impregnation and dimensionally accurate hardening of winding bars, coils or half-coils of electrical machines
DE2924191A1 (en) WINDING, ESPECIALLY OVERVOLTAGE WINDING FOR DRY TRANSFORMERS
DE1438304C (en) Process for the production and consolidation of insulated electrical conductor bundles
WO1995023420A1 (en) Twisted-conductor bundle for the windings of electric machines and equipment

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19860326

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: TRANSFORMATOREN UNION AKTIENGESELLSCHAFT

17Q First examination report despatched

Effective date: 19870818

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SIEMENS AKTIENGESELLSCHAFT BERLIN UND MUENCHEN

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 35746

Country of ref document: AT

Date of ref document: 19880715

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3563802

Country of ref document: DE

Date of ref document: 19880818

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19890731

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19890803

Year of fee payment: 5

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19900807

Ref country code: AT

Effective date: 19900807

GBPC Gb: european patent ceased through non-payment of renewal fee
EAL Se: european patent in force in sweden

Ref document number: 85109937.4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19991019

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19991124

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20000817

Year of fee payment: 16

Ref country code: BE

Payment date: 20000817

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20000825

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20000830

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000831

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000831

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010501

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010808

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010831

BERE Be: lapsed

Owner name: SIEMENS A.G. BERLIN UND MUNCHEN

Effective date: 20010831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020301

EUG Se: european patent has lapsed

Ref document number: 85109937.4

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020430

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20020301

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST