EP0553175B1 - Transformateur a sec ou bobine d'arret et leur procede de production - Google Patents

Transformateur a sec ou bobine d'arret et leur procede de production Download PDF

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Publication number
EP0553175B1
EP0553175B1 EP91918142A EP91918142A EP0553175B1 EP 0553175 B1 EP0553175 B1 EP 0553175B1 EP 91918142 A EP91918142 A EP 91918142A EP 91918142 A EP91918142 A EP 91918142A EP 0553175 B1 EP0553175 B1 EP 0553175B1
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EP
European Patent Office
Prior art keywords
winding
dry
ceramic material
type transformer
reactance coil
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP91918142A
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German (de)
English (en)
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EP0553175A1 (fr
Inventor
Theodor Rendenbach
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ABB Patent GmbH
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ABB Patent GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating
    • 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
    • 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
    • H01F2027/328—Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases

Definitions

  • the invention relates to a dry type transformer or an inductor, to a method for producing the winding of a dry type transformer or an inductor, to a method for producing a dry type transformer or an inductor, and to the use of ceramic material as insulation.
  • dry-type transformers and dry choke coils are increasingly being used as distribution transformers or choke coils instead of conventional liquid-insulated devices, particularly because of the fire risks posed by liquid-insulated devices and the danger to soil and groundwater from liquids in the event of leaks or transport accidents.
  • plastics For electrical insulation of the winding wires and layers, for external insulation and to protect the windings of dry-type transformers and dry choke coils against moisture and dirt, plastics are used, such as. B. epoxy, polyester, polyurethane or silicone resins. Cast resin transformers in which one or more windings are completely enclosed with an insulating material have proven to be particularly suitable. These cast resin transformers are therefore completely protected against the effects of moisture and pollution.
  • the plastics used for the electrical insulation of the dry transformers and dry choke coils also have certain disadvantages. In this way, these plastics can burn and develop smoke and toxic combustion gases in the event of a fire, which can endanger people and prevent extinguishing work.
  • the plastics used age due to oxidation and hydrolysis.
  • the chemical decomposition of the plastics is greatly accelerated at relatively high temperatures, which are in the range of the operating temperatures of transformers and choke coils.
  • the mechanical and dielectric properties of the plastics used deteriorate significantly at these temperatures. At even higher temperatures, the plastics are thermally decomposed.
  • Epoxy resins which are mainly used because of their overall best property profile, are disadvantageously not resistant to UV light.
  • the plastics used are sensitive to leakage currents, so that outdoor installation is only possible with complex protective housings. These protective housings are cost-intensive and disadvantageous due to the increase in weight and size of the transformers or the choke coils.
  • the invention has for its object to provide a dry transformer or a dry inductor, which are provided with an environmentally friendly, aging-resistant insulation and protective material with favorable fire behavior. Furthermore, methods for producing a dry transformer or a dry choke coil and their winding are to be mentioned. In addition, appropriate uses of ceramic material dry transformers and dry inductors should be mentioned.
  • a preferred solution with regard to the method for producing the winding of a dry-type transformer or a choke coil is that the inner lateral surface of the winding is first produced by fiber rovings with a mixture of a strongly alkaline solution with sodium and / or potassium and / or Calcium and / or lithium ions and a powder of silicate and aluminum are soaked and wound on a mold that the winding conductors are then wound up and further insulation is applied, and that preferably the winding thus prepared is subsequently heated to a temperature of 70 to 100 ° C is heated to harden the ceramic material.
  • the curing can alternatively also be carried out at room temperatures or temperatures higher than 100 ° C.
  • winding process it is also possible to cast at least one winding in the mold with said mixture or, after winding with winding conductors and necessary further insulation, to soak them in a plunge pool and then to carry out the hardening process. It is also possible to impregnate fiber rovings with said mixture and onto it Winding to wrap. In this way, several windings of a transformer can be separated or isolated together. It is also possible to insulate the winding wires and layers with synthetic resin and the outer sheath with ceramic material.
  • the object is achieved with respect to the method for producing a dry transformer or a dry inductor alternatively by the features characterized in claim 20 or 21, according to which the windings are separated or together or at least one winding together with an iron core in a form with a mixture of a strong alkaline solution with sodium and / or potassium and / or calcium and / or lithium ions and a powder of silicate and aluminum or alternatively the windings are separated or together or the entire active part is soaked in a plunge pool with said mixture.
  • the ceramic material is then hardened at room temperatures or temperatures of 70 to 100 ° C.
  • the ceramic material depending on the composition, has a temperature resistance between 700 ° C. and 1200 ° C. and is not degraded by oxidation and hydrolysis. It is therefore possible to increase the operating temperatures of transformers and choke coils compared to the previous state of the art.
  • the ceramic material is non-flammable and therefore offers the greatest advantages in all cases in which transformers or choke coils pose fire risks. It is even advantageously possible to continue to operate the transformers and choke coils for a certain time after being involved in a fire due to the very high temperature resistance of the ceramic material, in order to maintain the electrical energy supply in a dangerous situation.
  • Ceramic material is an environmentally friendly material, from which no hazardous substances are released even after the end of its useful life when it is landfilled.
  • Ceramic material is resistant to leakage current and UV light so that it can be used outdoors when the devices are installed outdoors, without the need to use expensive protective housings.
  • the shrinkage during hardening and the thermal expansion can be kept very low, which means that components with high dimensional accuracy can be produced, as well as shrinkage stresses and cavities are avoided, which prevents partial discharges during operation.
  • the relatively low hardening temperatures and the relatively short hardening times save energy costs during production.
  • the aforementioned high temperature resistance makes it possible to completely encapsulate the winding and the core, even in the case of transformers or choke coils of higher powers, and to reduce the cooling surface. This optimizes the protection of the winding and core parts against harmful environmental influences - especially moisture.
  • the relatively high thermal conductivity that can be achieved, depending on the composition of the ceramic material is also favorable, because this reduces the build-up of high internal temperatures and temperature differences during operation.
  • FIG. 1.1 shows a dry transformer part and in FIG. 1.2 a variant of a choke coil part each with a winding insulated with ceramic material.
  • An iron core 1, a first winding 2 and a second winding 4 can be seen in FIG. 1.1.
  • 1.2 shows an iron core 11 with air gaps 12 and a choke coil winding 13, the so-called air gaps 12 being formed with a non-ferromagnetic material.
  • the outer lateral surfaces of the first winding 2 and the winding 13 are insulated with ceramic material 3.
  • This outer insulation is preferably produced according to the roving winding process, in the case of glass fiber rovings or rovings of other fiber materials are soaked with the solution described below and contains a powder of silicate and aluminum and are wound onto the spools. This is followed by the curing process described below at room temperature or elevated temperature. It is possible to insulate the outer lateral surface of the second winding 4 with ceramic material in the same way as the outer surface of the winding 2. It is also possible to use ceramic material for the so-called air gaps 12, the material being reinforced by mixing in glass fibers can.
  • FIG. 2 shows a dry transformer part with a winding completely encapsulated in ceramic material.
  • An iron core 1, a first winding 2, a second winding 4 and ceramic material 3 can be seen, the ceramic material 3 completely enclosing the first winding 2.
  • the winding 2 is brought into an appropriately designed shape and cast with the solution described below, containing a powder of silicate and aluminum.
  • this variant can also be applied to dry choke coils, in which case air gaps in the iron core 11 and only one winding 13 are provided.
  • the casting process can be carried out using a vacuum. This is followed by the curing process described in more detail below at room temperature or elevated temperature. It is possible to completely encapsulate the outer surface of the second winding 4 with ceramic material in the same way as the outer surface of the first winding 2. The same method can also be applied to the winding 13 of a choke coil.
  • the inner lateral surface 5 (FIG. 2) is first produced in accordance with the roving winding process, in which the glass fiber rovings or other fiber rovings are impregnated with the strongly alkaline solution described below and containing a powder of silicate and aluminum and to a suitable shape be wrapped.
  • the winding conductors and necessary further insulations are wound onto the inner surface thus created, the further insulations also being produced using the roving winding method.
  • Either the fiber rovings are soaked with the strongly alkaline solution described below, containing a powder of silicate and aluminum, or alternatively with a liquid plastic material (synthetic resin).
  • the outer insulation is produced, in the same way as shown above in the description of FIG. 1. This is followed by the hardening process described below. The same method can be applied to the winding 13 of a choke coil.
  • the winding of a dry transformer or a choke coil is immersed in a plunge pool after the winding of the winding conductors and necessary further insulation contains the strongly alkaline solution described below, including the powder made of silicate and aluminum.
  • fiber mats, fiber fabrics or similar fiber materials can be applied here before the impregnation process.
  • the impregnation process can preferably be carried out under vacuum in order to avoid air pockets.
  • the curing process described below follows the impregnation process.
  • FIG. 3 shows a dry transformer part with a first winding completely encapsulated in ceramic material and a second winding encapsulated together with the iron core.
  • An iron core 1, a first winding 2, a second winding 4 and ceramic material 3 can be seen, the ceramic material 3 completely enclosing both the winding 2 and the winding 4 together with the iron core 1.
  • the second winding 4 is omitted and the iron core 1 is designed with so-called air gaps.
  • the encapsulation is carried out as described in FIG. 2, the iron core being brought together with the winding 4 into an appropriately designed shape in order to carry out the casting process, preferably using a vacuum.
  • the second winding 4 can be isolated and encapsulated according to one of the further methods described in FIGS. 1 and 2, the iron core outer surface denoted by numeral 6 in FIG. 3 serving as a form for forming the inner jacket surface 5.
  • FIG. 4 shows a dry transformer part with windings which together are completely encapsulated in ceramic material.
  • An iron core 1 and two windings 2 and 4 with ceramic material 3 can be seen, the ceramic material 3 completely enclosing both windings.
  • the encapsulation is carried out according to a method described in FIG. 2, the windings 2, 4 either being brought together into a correspondingly shaped form and potted or soaked together in the immersion process or co-processed in the roving winding process - preferably using a vacuum.
  • FIG. 5 shows a dry transformer part with two windings encapsulated with the iron core together with ceramic material.
  • An iron core 1, windings 2 and 4 and ceramic material 3 can be seen, the ceramic material 3 completely enclosing both the windings 2 and 4 and the iron core.
  • the encapsulation is carried out either by the casting process, in which the iron core is brought into an appropriately designed shape together with all the windings, or by the impregnation process, in which the iron core is immersed in a drinking basin together with all the windings. Both methods are described in Figure 2 and are preferably carried out under vacuum.
  • FIG. 6 shows a dry transformer winding part or choke coil winding part with layer insulation and encapsulation made of ceramic material.
  • the winding conductors 7, the outer insulation or encapsulation 8 and the inner layer insulation 9 (inner winding insulation layers) can be seen.
  • the inner winding insulation layers 9, like the outer insulation 8, are produced using a method described in FIGS. 1 to 5 with ceramic material.
  • FIG. 7 shows a dry transformer winding part or choke coil winding part with layer and wire insulation made of ceramic material.
  • the winding conductors 7 and the insulation 10 made of ceramic material can be seen. It is clarified that not only the inner winding layers g according to FIG. 6, but also the insulation from winding conductor to winding conductor can be produced with a ceramic material using a method described in FIGS. 1 to 5.
  • FIGS. 6 and 7 show winding conductors 7 with a round cross section. Alternatively, winding conductors with a rectangular cross section can be used.
  • the ceramic material used is an alumino-silicate-based ceramic material with a silicon-aluminum atom ratio, preferably between 2 and 4 (equilibrium ratio 2.07 to 4.14).
  • a fine powder of aluminum and silicate is placed in a strongly alkaline solution that contains sodium, potassium, calcium or lithium ions or a combination of all these elements.
  • the grain sizes used are preferably between 0.25 ⁇ m and 1 ⁇ m.
  • the solution is one Liquid with a viscosity between approx. 500 and 300 mPas.
  • the heating up period is essentially determined by the dimension of the component, the material being able to cure in principle at different temperature gradients.
  • the curing time for 0.1 mm thick films at 70 ° C is approx. 30 min, for 1 cm thick blocks at the same temperature approx. 3 hours. Hardening is also possible at room temperature, but the time required for this is on the order of days, again depending on the geometry.
  • the reaction produces water as a condensation product, which is removed from the material by heating for several hours at temperatures above 50 ° C. This drying is an important time factor, as it is much slower than hardening, especially for large components.
  • the heating speed also plays an important role here, since if the heating is too fast, cracks may occur in the material.
  • the resulting ceramic material has ceramic properties regarding high temperature strength, chemical stability, hardness, fracture toughness and electrical properties.
  • the material properties - in particular the mechanical strength - can also be influenced by reinforcing the ceramic material with various fiber materials or fillers. In particular, glass fibers and / or mineral fillers can be used.
  • Ceramic material can be completely sealed with a ceramic-like glaze on its surface or with a thin coating of another water-impermeable material. Liquids with favorable dielectric properties such as. B. a silicone-containing emulsion, for impregnating the ceramic material and thus to increase the dielectric strength of the material, and a silicone-containing lacquer for the outer coating of the material.

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

Abstract

Les conducteurs et/ou les nappes et/ou l'enveloppe extérieure d'au moins un enroulement (2, 13) d'un transformateur à sec ou d'une bobine d'arrêt sont isolés avec une résine céramique (3). En variante, au moins un enroulement, ou le noyau de fer (1, 11) avec les enroulements (2, 13), peuvent être entièrement enserrés dans de la résine céramique (3). Afin de produire la résine céramique, on prépare une solution fortement alcaline avec du sodium et/ou du potassium et/ou du calcium et/ou du lithium, ainsi qu'un epoudre de silicate et d'aluminium. Dans une autre variante, on peut imbiber des stratifils de verre textile avec cette solution et les enrouler sur l'enroulement, ou l'on introduit l'enroulement, ou le noyau de fer avec les enroulements, dans un moule et on les arrose avec cette solution. Suit une cuisson à une température comprise entre 70 et 100 °C. La cuisson peut être suivie d'une imprégnation avec un liquide ayant des propriétés diélectriques favorables.

Claims (35)

  1. Transformateur à sec ou bobine de self-induction comportant un noyau de fer, au moins un enroulement avec des conducteurs d'enroulement, une enveloppe extérieure et une isolation, caractérisé par le fait qu'il est prévu comme isolation un matériau céramique à base de silicate d'aluminium.
  2. Transformateur à sec ou bobine de self-induction selon la revendication 1 dans lequel l'enveloppe extérieure d'au moins un enroulement (2, 13) est isolée au moyen du matériau céramique (3).
  3. Transformateur à sec ou bobine de self-induction selon la revendication 2 dans lequel au moins un enroulement (2, 13) est entièrement entouré par le matériau céramique (3).
  4. Transformateur à sec ou bobine de self-induction selon la revendication 3 dans lequel le noyau de fer (1, 11) et au moins un enroulement (2, 13) sont entièrement entourés par le matériau céramique (3).
  5. Transformateur à sec ou bobine de self-induction selon la revendication 1 dans lequel les conducteurs d'enroulement (7) d'au moins un enroulement sont isolés au moyen du matériau céramique (10).
  6. Transformateur à sec ou bobine de self-induction selon la revendication 1 dans lequel les couches (9) intérieures d'isolation des enroulements et l'isolation (8) extérieure d'au moins un enroulement sont constituées par le matériau céramique.
  7. Transformateur à sec ou bobine de self-induction selon l'une des revendications 1 à 6 dans lequel le matériau céramique présente la combinaison de tétraèdres A1O₄ et SiO₄.
  8. Transformateur à sec ou bobine de self-induction selon l'une des revendications 1 à 7 dans lequel les surfaces du matériau céramique sont au moins partiellement vitrifiées au moyen d'un vernis de type céramique, comme cela est courant dans le cas de céramiques.
  9. Transformateur à sec ou bobine de self-induction selon l'une des revendications 1 à 7 dans lequel la surface du matériau céramique est au moins partiellement vitrifiée au moyen d'un matériau ne laissant pas passer l'eau.
  10. Transformateur à sec ou bobine de self-induction selon la revendication 9, caractérisé par l'utilisation d'une peinture contenant des silicones pour le revêtement extérieur du matériau céramique.
  11. Transformateur à sec ou bobine de self-induction selon la revendication 9, caractérisé par l'utilisation d'une émulsion contenant des silicones pour l'imprégnation du matériau céramique.
  12. Transformateur à sec ou bobine de self-induction selon l'une des revendications 1 à 7 dans lequel le matériau céramique utilisé est totalement ou partiellement imprégné d'un liquide présentant des propriétés diélectriques favorables tel que de la résine époxyde ou de la résine silicone.
  13. Procédé de fabrication d'un enroulement d'un transformateur à sec ou d'une bobine de self-induction, caractérisé par le fait qu'on réalise tout d'abord la surface périphérique (5) intérieure de l'enroulement par imprégnation d'un roving de fibres au moyen d'une solution fortement alcaline contenant des ions sodium et/ou potassium et/ou calcium et/ou lithium et une poudre de silicate et d'aluminium et par enroulement de celui-ci sur une forme, par le fait que l'on enroule ensuite les conducteurs de l'enroulement et que l'on applique des isolations supplémentaires.
  14. Procédé selon la revendication 13 dans lequel les isolations supplémentaires sont également réalisées en utilisant des rovings de fibres.
  15. Procédé selon la revendication 14 dans lequel les rovings de fibres sont également imprégnés d'une solution fortement alcaline contenant des ions sodium et/ou potassium et/ou calcium et/ou lithium et une poudre de silicate et d'aluminium.
  16. Procédé selon la revendication 14 dans lequel les rovings de fibres sont en outre imprégnés d'une résine synthétique liquide telle que de la résine époxyde ou de la résine silicone.
  17. Procédé de fabrication d'un enroulement d'un transformateur à sec ou d'une bobine de self-induction, caractérisé par le fait qu'après enroulement des conducteurs d'enroulement et de l'isolation supplémentaire nécessaire, on imprègne l'enroulement dans une cuve d'immersion au moyen d'une solution fortement alcaline contenant des ions sodium et/ou potassium et/ou calcium et/ou lithium et une poudre de silicate et d'aluminium.
  18. Procédé de fabrication d'un enroulement d'un transformateur à sec ou d'une bobine de self-induction, caractérisé par le fait que l'on imprègne des rovings de fibres au moyen d'une solution fortement alcaline contenant des ions sodium et/ou potassium et/ou calcium et/ou lithium et une poudre de silicate et d'aluminium et on les enroule sur l'enroulement (2, 13).
  19. Procédé de fabrication d'au moins un enroulement d'un transformateur à sec ou d'une bobine de self-induction, caractérisé par le fait que l'on enrobe au moins un enroulement placé dans un moule au moyen d'une solution fortement alcaline contenant des ions sodium et/ou potassium et/ou calcium et/ou lithium et une poudre de silicate et d'aluminium.
  20. Procédé de fabrication d'un enroulement d'un transformateur à sec ou d'une bobine de self-induction, caractérisé par le fait que l'on enrobe au moins un enroulement (2, 13) avec un noyau de fer (1) au moyen d'une solution fortement alcaline contenant des ions sodium et/ou potassium et/ou calcium et/ou lithium et une poudre de silicate et d'aluminium dans une cuve d'immersion.
  21. Procédé de fabrication d'un enroulement d'un transformateur à sec ou d'une bobine de self-induction, caractérisé par le fait que l'on imprègne au moins un enroulement (2, 13) et un noyau de fer (1) au moyen d'une solution fortement alcaline contenant des ions sodium et/ou potassium et/ou calcium et/ou lithium et une poudre de silicate et d'aluminium dans une cuve d'immersion.
  22. Procédé selon au moins une des revendications 13 à 21 dans lequel le rapport atomique silicium/aluminium est compris entre 2 et 4.
  23. Procédé selon au moins une des revendications 13 à 21, caractérisé par le fait que la dimension de grain de la poudre est comprise entre 0,25 µm et 1 µm.
  24. Procédé selon au moins une des revendications 13 à 23 dans lequel les enroulements ou les enroulements avec noyau de fer ou le transformateur sont ensuite réchauffés à une température allant de 70 à 100 °C.
  25. Procédé selon au moins une des revendications 13 à 24, caractérisé par l'utilisation de vide lors des opérations de bobinage, d'enrobage ou d'imprégnation.
  26. Procédé selon au moins une des revendications 13 à 25 dans lequel la solution contient en outre des fibres, de préférence des fibres de verre.
  27. Procédé selon au moins une des revendications 13 à 26 dans lequel la solution contient en outre des matières de charge, de préférence des matières de charge minérales.
  28. Procédé selon au moins une des revendications 13 à 27 dans lequel l'eau produite lors de la réaction de durcissement est éliminée par chauffage pendant plusieurs heures à des températures supérieures à 50 °C.
  29. Procédé selon au moins une des revendications 13 à 28 dans lequel, après durcissement, le matériau céramique est imprégné par immersion d'au moins un enroulement dans une cuve d'immersion contenant un liquide avec des propriétés diélectriques favorables.
  30. Procédé selon au moins une des revendications 13 à 29 dans lequel, après durcissement, le matériau céramique est imprégné par immersion d'au moins un enroulement avec le noyau de fer dans une cuve d'immersion contenant un liquide avec des propriétés diélectriques favorables.
  31. Procédé selon au moins une des revendications 29 et 30 dans lequel le liquide d'imprégnation ou les composants à imprégner sont réchauffés à des températures supérieures à 30 °C.
  32. Procédé selon au moins une des revendications 29 et 30 dans lequel le liquide d'imprégnation et les composants à imprégner sont réchauffés à des températures supérieures à 30 °C.
  33. Procédé selon au moins une des revendications 29 à 32 dans lequel on applique le vide lors du processus d'imprégnation.
  34. Utilisation de matériau céramique à base de Al-Si comme matériau d'isolation et/ou de protection pour les enroulements de transformaeurs à sec et de bobines de self-induction.
  35. Utilisation de matériau céramique à base de Al-Si comme matériau d'isolation et/ou de protection pour les enroulements et le noyau de fer de transformateurs à sec et de bobines de self-induction.
EP91918142A 1990-10-18 1991-10-15 Transformateur a sec ou bobine d'arret et leur procede de production Expired - Lifetime EP0553175B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4033030 1990-10-18
DE4033030 1990-10-18
DE4110223A DE4110223A1 (de) 1990-10-18 1991-03-28 Trockentransformator oder drosselspule und verfahren zu ihrer herstellung
DE4110223 1991-03-28
PCT/EP1991/001956 WO1992007369A1 (fr) 1990-10-18 1991-10-15 Transformateur a sec ou bobine d'arret et leur procede de production

Publications (2)

Publication Number Publication Date
EP0553175A1 EP0553175A1 (fr) 1993-08-04
EP0553175B1 true EP0553175B1 (fr) 1994-09-07

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EP91918142A Expired - Lifetime EP0553175B1 (fr) 1990-10-18 1991-10-15 Transformateur a sec ou bobine d'arret et leur procede de production

Country Status (5)

Country Link
EP (1) EP0553175B1 (fr)
AU (1) AU8722791A (fr)
DE (2) DE4110223A1 (fr)
ES (1) ES2062817T3 (fr)
WO (1) WO1992007369A1 (fr)

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DE4343121A1 (de) * 1993-12-17 1995-06-22 Abb Patent Gmbh Verfahren zur Herstellung einer Gießkeramik
DE19505529A1 (de) * 1994-12-24 1996-06-27 Abb Patent Gmbh Transformator mit tragfähigem Spulenkörper
KR100341321B1 (ko) * 1999-07-26 2002-06-21 윤종용 전자렌지용 트랜스포머
FI118398B (fi) * 2005-05-17 2007-10-31 Nokian Capacitors Oy Menetelmä ja sovitelma kuristimen valmistamiseksi ja kuristin
CN105931811A (zh) * 2016-06-27 2016-09-07 杨林娣 一种油浸式电力电压器
CN105931809A (zh) * 2016-06-27 2016-09-07 杨林娣 一种油浸式变压器
CN113903562A (zh) * 2021-10-14 2022-01-07 广东电网有限责任公司 一种干式变压器及其制备方法和应用

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DE3172884D1 (en) * 1981-06-04 1985-12-19 Nikkiso Co Ltd Process for forming a ceramic-like insulation
SE439212B (sv) * 1983-10-06 1985-06-03 Asea Lepper Gmbh Distanshallare mellan ledarlager for en lagerlindning for en transformator eller reaktor
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FR2630253A1 (fr) * 1988-04-19 1989-10-20 Alsthom Procede d'amelioration de la tenue au feu d'un bobinage de transformateur electrique sec

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CN105931810A (zh) * 2016-06-27 2016-09-07 杨林娣 一种电力电压器

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WO1992007369A1 (fr) 1992-04-30
ES2062817T3 (es) 1994-12-16
DE4110223A1 (de) 1992-04-23
AU8722791A (en) 1992-05-20
DE59102870D1 (de) 1994-10-13
EP0553175A1 (fr) 1993-08-04

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