EP0338476A1 - Method for improving the fire resistance of a dry-type transformer winding - Google Patents

Method for improving the fire resistance of a dry-type transformer winding Download PDF

Info

Publication number
EP0338476A1
EP0338476A1 EP89106829A EP89106829A EP0338476A1 EP 0338476 A1 EP0338476 A1 EP 0338476A1 EP 89106829 A EP89106829 A EP 89106829A EP 89106829 A EP89106829 A EP 89106829A EP 0338476 A1 EP0338476 A1 EP 0338476A1
Authority
EP
European Patent Office
Prior art keywords
resin
fire resistance
improving
winding
products
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
EP89106829A
Other languages
German (de)
French (fr)
Other versions
EP0338476B1 (en
Inventor
Dominique Lacaze
Jacques Samat
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.)
Alstom Holdings SA
Original Assignee
Alstom SA
GEC Alsthom SA
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 Alstom SA, GEC Alsthom SA filed Critical Alstom SA
Publication of EP0338476A1 publication Critical patent/EP0338476A1/en
Application granted granted Critical
Publication of EP0338476B1 publication Critical patent/EP0338476B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • 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 present invention relates to a method for improving the fire resistance of a dry electrical transformer winding.
  • the invention applies to the high voltage winding of an electric transformer.
  • a method is known in which glass cloth is placed in the body of the winding, for example between the different wafers, in the case of a wafer in wafers, or between the layers of conductors in the case of a winding produced in long layers.
  • the winding is also surrounded on its internal and external faces with a glass fabric.
  • the assembly is then placed in a mold in which a vacuum is produced, and then a generally flame-retardant polymerizable resin is injected there.
  • This process gives the coil good resistance to thermal shock.
  • the glass fabric and resin assembly has a coefficient of expansion close to that of the electrical conductors.
  • this process also gives, thanks to the resistance of the glass fabrics, very good resistance to electrodynamic stresses.
  • the object of the present invention is to propose a method improvement of the fire resistance of an electrical transformer winding.
  • the invention therefore relates to a method of improving the fire resistance of a dry electrical transformer coil impregnated with resin, characterized in that said coil is surrounded on its internal and external faces, with a material to glass fiber base which has been pre-impregnated with a resin of the same type as the impregnation resin and heavily loaded with non-combustible products.
  • Non-combustible products used as resin filler are, for example, flame retardant mineral products.
  • this material the fibers of which are covered with a resin sheath very loaded with non-combustible products, constitutes a heat shield considerably improving the fire resistance of the winding.
  • said impregnation resin is an unfilled resin, injected after the installation of said glass fiber-based material previously prepreg of said resin heavily loaded with non-combustible products.
  • said impregnation resin is a resin loaded with silica, injected and polymerized before the installation of said material based on glass fiber previously prepreg of said resin heavily loaded with products non-combustible.
  • the winding is carried out without glass fabric; on the other hand, after the installation of the fiberglass-based material, around the internal and external faces of the winding, the winding receives a flame retardant polymerizable resin.
  • the winding can advantageously be filled with fiberglass-based material and not loaded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

The method improves the fire resistance of a dry-type transformer winding impregnated with resin. The said winding is surrounded over its inner and outer surfaces by a material based on fibre-glass which has been previously preimpregnated with a resin of the same type as the impregnation resin and loaded with a high concentration of incombustible substances.

Description

La présente invention concerne un procédé d'amélioration de la tenue au feu d'un bobinage de transformateur électrique sec. En particulier, l'invention s'applique au bobinage haute tension d'un transformateur électrique.The present invention relates to a method for improving the fire resistance of a dry electrical transformer winding. In particular, the invention applies to the high voltage winding of an electric transformer.

On connaît un procédé dans lequel on dispose du tissu de verre dans le corps du bobinage, par exemple entre les différentes galettes, dans le cas d'un bobinage en galettes, ou entre les couches de conducteurs dans le cas d'un bobinage réalisé en couches longues.A method is known in which glass cloth is placed in the body of the winding, for example between the different wafers, in the case of a wafer in wafers, or between the layers of conductors in the case of a winding produced in long layers.

Dans ce procédé, le bobinage est en outre également entouré sur ses faces interne et externe d'un tissu de verre. L'ensemble est ensuite placé dans un moule dans lequel on réalise le vide, puis on y injecte une résine polymérisable généralement ignifugée.In this process, the winding is also surrounded on its internal and external faces with a glass fabric. The assembly is then placed in a mold in which a vacuum is produced, and then a generally flame-retardant polymerizable resin is injected there.

Ce procédé confère au bobinage une bonne tenue aux chocs thermiques. En effet, l'ensemble tissu de verre et résine présente un coefficient de dilatation voisin de celui des conducteurs électriques. En outre, ce procédé confère également, grâce à la résistance des tissus de verre, une très bonne tenue aux contraintes électrodynamiques.This process gives the coil good resistance to thermal shock. In fact, the glass fabric and resin assembly has a coefficient of expansion close to that of the electrical conductors. In addition, this process also gives, thanks to the resistance of the glass fabrics, very good resistance to electrodynamic stresses.

Cependant, un tel bobinage, même enrobé au moyen d'une résine ignifugée, ne permet pas de satisfaire à certains tests très exigeants de tenue au feu.However, such a winding, even coated with a flame-retardant resin, does not make it possible to satisfy certain very demanding tests of fire resistance.

On connaît un autre procédé dans lequel le bobinage haute tension est enrobé dans une résine fortement chargée en silice, de l'ordre de 65 %, ce qui permet d'améliorer la tenue au feu du transformateur. Cependant, dans un tel cas, on n'utilise pas ou peu de tissu de verre dans le bobinage ou autour, car ces tissus agissent comme filtre lors de l'injection de la résine chargée rendant difficile la coulée de la résine. L'absence ou la faible quantité de tissus de verre imprégnés de résine diminue beaucoup la résistance du bobinage et sa tenue aux contraintes électrodynamiques. Par ailleurs, la tenue aux chocs thermiques est également moins bonne, car le coefficient de dilatation de l'ensemble résine et silice est plus différent de celui des conducteurs électriques, que dans le procédé précédent.Another process is known in which the high-voltage winding is coated in a resin heavily loaded with silica, of the order of 65%, which improves the fire resistance of the transformer. However, in such a case, little or no glass fabric is used in or around the winding, since these fabrics act as a filter during the injection of the charged resin making it difficult to pour the resin. The absence or the small quantity of glass fabrics impregnated with resin greatly reduces the resistance of the winding and its resistance to electrodynamic stresses. Furthermore, the resistance to thermal shock is also less good, because the coefficient of expansion of the resin and silica assembly is more different from that of the electrical conductors, than in the previous process.

La présente invention a pour but de proposer un procédé d'amélioration de la tenue au feu d'un bobinage de transformateur électrique.The object of the present invention is to propose a method improvement of the fire resistance of an electrical transformer winding.

L'invention a ainsi pour objet un procédé d'amélioration de la tenue au feu d'un bobinage de transformateur électrique sec imprégné de résine, caractérisé par le fait que ledit bobinage est entouré sur ses faces interne et externe, d'un matériau à base de fibres de verre qui a été préalablement préimprégné d'une résine du même type que la résine d'imprégnation et fortement chargée de produits incombustibles.The invention therefore relates to a method of improving the fire resistance of a dry electrical transformer coil impregnated with resin, characterized in that said coil is surrounded on its internal and external faces, with a material to glass fiber base which has been pre-impregnated with a resin of the same type as the impregnation resin and heavily loaded with non-combustible products.

Les produits incombustibles utilisés comme charge de la résine sont par exemple des produits minéraux retardateurs de flamme.Non-combustible products used as resin filler are, for example, flame retardant mineral products.

Ainsi, ce matériau, dont les fibres sont recouvertes d'une gaine de résine très chargée en produits incombustibles, constitue un bouclier thermique améliorant considérablement la tenue au feu du bobinage.Thus, this material, the fibers of which are covered with a resin sheath very loaded with non-combustible products, constitutes a heat shield considerably improving the fire resistance of the winding.

Selon une première forme de réalisation du procédé de l'invention, ladite résine d'imprégnation est une résine non chargée, injectée après la mise en place dudit matériau à base de fibre de verre préalablement préimprégné de ladite résine fortement chargée de produits incombustibles.According to a first embodiment of the method of the invention, said impregnation resin is an unfilled resin, injected after the installation of said glass fiber-based material previously prepreg of said resin heavily loaded with non-combustible products.

Selon une deuxième forme de réalisation du procédé de l'invention, ladite résine d'imprégnation est une résine chargée de silice, injectée et polymérisée avant la mise en place dudit matériau à base de fibre de verre préalablement préimprégné de ladite résine fortement chargée de produits incombustibles.According to a second embodiment of the process of the invention, said impregnation resin is a resin loaded with silica, injected and polymerized before the installation of said material based on glass fiber previously prepreg of said resin heavily loaded with products non-combustible.

Dans cette seconde forme de réalisation, le bobinage est réalisé sans tissu de verre ; d'autre part, après la mise en place du matériau à base de fibre de verre, autour des faces interne et externe du bobinage, le bobinage reçoit une résine polymérisable ignifugée. Dans la première forme de réalisation, le bobinage peut être avantageusement garni de matériau à base de fibre de verre et non chargé.In this second embodiment, the winding is carried out without glass fabric; on the other hand, after the installation of the fiberglass-based material, around the internal and external faces of the winding, the winding receives a flame retardant polymerizable resin. In the first embodiment, the winding can advantageously be filled with fiberglass-based material and not loaded.

Claims (5)

1/ Procédé d'amélioration de la tenue au feu d'un bobinage de transformateur électrique sec imprégné de résine, caractérisé par le fait que ledit bobinage est entouré sur ses faces interne et externe, d'un matériau à base de fibre de verre qui a été préalablement pré­imprégné d'une résine, du même type que la résine d'imprégnation et fortement chargée de produits incombustibles.1 / A method of improving the fire resistance of a dry electrical transformer coil impregnated with resin, characterized in that said coil is surrounded on its internal and external faces, with a material based on fiberglass which has been pre-impregnated with a resin, of the same type as the impregnation resin and heavily loaded with non-combustible products. 2/ Procédé d'amélioration de la tenue au feu d'un bobinage de transformateur électrique sec, selon la revendication 1, caractérisé en ce que lesdits produits sont des produits minéraux retardateurs de flamme.2 / A method of improving the fire resistance of a dry electrical transformer winding, according to claim 1, characterized in that said products are flame retardant mineral products. 3/ Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que la résine utilisée est une résine époxyde ignifugée.3 / Method according to one of claims 1 or 2, characterized in that the resin used is a flame retardant epoxy resin. 4/ Procédé selon l'une des revendications 1 à 3, caractérisé en ce que ladite résine d'imprégnation est une résine non chargée, injectée après la mise en place dudit matériau à base de fibre de verre préalablement préimprégné de ladite résine fortement chargée de produits incombus­tibles.4 / A method according to one of claims 1 to 3, characterized in that said impregnation resin is an unfilled resin, injected after the introduction of said fiberglass material previously prepreg of said highly charged resin non-combustible products. 5/ Procédé selon l'une des revendications 1 à 3, caractérisé en ce que ladite résine d'imprégnation est une résine chargée de silice, injectée et polymérisée avant la mise en place dudit matériau à base de fibre de verre préalablement préimprégné de ladite résine fortement chargée de produits incombustibles.5 / Method according to one of claims 1 to 3, characterized in that said impregnation resin is a resin loaded with silica, injected and polymerized before the establishment of said material based on glass fiber pre-impregnated with said resin heavily loaded with non-combustible products.
EP19890106829 1988-04-19 1989-04-17 Method for improving the fire resistance of a dry-type transformer winding Expired - Lifetime EP0338476B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805157 1988-04-19
FR8805157A FR2630253A1 (en) 1988-04-19 1988-04-19 METHOD FOR IMPROVING THE FIRE RESISTANCE OF A DRY ELECTRICAL TRANSFORMER

Publications (2)

Publication Number Publication Date
EP0338476A1 true EP0338476A1 (en) 1989-10-25
EP0338476B1 EP0338476B1 (en) 1993-08-18

Family

ID=9365442

Family Applications (1)

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EP19890106829 Expired - Lifetime EP0338476B1 (en) 1988-04-19 1989-04-17 Method for improving the fire resistance of a dry-type transformer winding

Country Status (4)

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EP (1) EP0338476B1 (en)
DE (1) DE68908453T2 (en)
ES (1) ES2042855T3 (en)
FR (1) FR2630253A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992007369A1 (en) * 1990-10-18 1992-04-30 Abb Patent Gmbh Dry transformer or choke coil and process for making it
EP3051546A1 (en) * 2015-02-02 2016-08-03 Starkstrom-gerätebau GmbH Fire resistant electric coil and power transformer using the same

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1098178A (en) * 1954-01-12 1955-07-19 G Ab Assembly process by gluing and products obtained
GB766905A (en) * 1953-06-15 1957-01-30 Reyrolle A & Co Ltd Improvements relating to the insulation of high-voltage electrical apparatus
US3263196A (en) * 1963-07-16 1966-07-26 Mc Graw Edison Co Encapsulated electrical coil having means to aid impregnation
GB1141706A (en) * 1965-03-10 1969-01-29 Atomic Energy Commission Radiation resistant insulation
FR2285693A1 (en) * 1974-09-19 1976-04-16 Matsushita Electric Ind Co Ltd ENCAPSULATED ELECTROMAGNETIC COIL WITH SYNTHETIC RESIN
DE2530388B1 (en) * 1975-07-08 1976-12-16 Elsic Elek Sche Sicherheitsaus Fire retardant, electrically insulating mouldings - comprise self extinguishing polyester resin, glass and or asbestos fibre reinforcement and aluminium hydroxide
DE2844693A1 (en) * 1977-10-14 1979-04-26 Flamemaster Corp SELF-EXTINGUISHING, FIRE RESISTANT MASS AND OBJECT WITH SUCH MASS
GB1602970A (en) * 1978-05-31 1981-11-18 English Electric Co Ltd Three phase transformers
EP0132936A1 (en) * 1983-07-21 1985-02-13 Minnesota Mining And Manufacturing Company Flexible fibrous endothermic sheet material for fire protection

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5763816A (en) * 1980-10-06 1982-04-17 Hitachi Ltd Molded transformer coil
JPS60180108A (en) * 1984-02-27 1985-09-13 Sanyurejin Kk Manufacture of flyback transformer

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB766905A (en) * 1953-06-15 1957-01-30 Reyrolle A & Co Ltd Improvements relating to the insulation of high-voltage electrical apparatus
FR1098178A (en) * 1954-01-12 1955-07-19 G Ab Assembly process by gluing and products obtained
US3263196A (en) * 1963-07-16 1966-07-26 Mc Graw Edison Co Encapsulated electrical coil having means to aid impregnation
GB1141706A (en) * 1965-03-10 1969-01-29 Atomic Energy Commission Radiation resistant insulation
FR2285693A1 (en) * 1974-09-19 1976-04-16 Matsushita Electric Ind Co Ltd ENCAPSULATED ELECTROMAGNETIC COIL WITH SYNTHETIC RESIN
DE2530388B1 (en) * 1975-07-08 1976-12-16 Elsic Elek Sche Sicherheitsaus Fire retardant, electrically insulating mouldings - comprise self extinguishing polyester resin, glass and or asbestos fibre reinforcement and aluminium hydroxide
DE2844693A1 (en) * 1977-10-14 1979-04-26 Flamemaster Corp SELF-EXTINGUISHING, FIRE RESISTANT MASS AND OBJECT WITH SUCH MASS
GB1602970A (en) * 1978-05-31 1981-11-18 English Electric Co Ltd Three phase transformers
EP0132936A1 (en) * 1983-07-21 1985-02-13 Minnesota Mining And Manufacturing Company Flexible fibrous endothermic sheet material for fire protection

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 20 (E-376)(2077) 25 janvier 1986, & JP-A-60 180 108 (SANYUREJIN K.K.) 13 septembre 1985 *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 140 (E-121)(1018) 29 juillet 1982, & JP-A-57 063 816 (HITACHI SEISAKUSHO K.K.) 17 avril 1982, *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992007369A1 (en) * 1990-10-18 1992-04-30 Abb Patent Gmbh Dry transformer or choke coil and process for making it
EP3051546A1 (en) * 2015-02-02 2016-08-03 Starkstrom-gerätebau GmbH Fire resistant electric coil and power transformer using the same

Also Published As

Publication number Publication date
FR2630253A1 (en) 1989-10-20
DE68908453D1 (en) 1993-09-23
ES2042855T3 (en) 1993-12-16
DE68908453T2 (en) 1994-02-17
EP0338476B1 (en) 1993-08-18

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