EP3410451B1 - Anneau de protection pour une bobine de transformateur - Google Patents

Anneau de protection pour une bobine de transformateur Download PDF

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Publication number
EP3410451B1
EP3410451B1 EP18170346.3A EP18170346A EP3410451B1 EP 3410451 B1 EP3410451 B1 EP 3410451B1 EP 18170346 A EP18170346 A EP 18170346A EP 3410451 B1 EP3410451 B1 EP 3410451B1
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EP
European Patent Office
Prior art keywords
grading ring
electrically conductive
insulating layer
transformer according
filler
Prior art date
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Application number
EP18170346.3A
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German (de)
English (en)
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EP3410451A1 (fr
Inventor
Dieter Breitfelder
Steffen Lang
Andreas Möhl
Igor Ritberg
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 Energy Global GmbH and Co KG
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Siemens Energy Global GmbH and Co KG
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Priority claimed from DE102017212026.6A external-priority patent/DE102017212026A1/de
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    • 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
    • H01F27/288—Shielding
    • H01F27/2885—Shielding with shields or electrodes
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens

Definitions

  • the invention relates to a screen ring and / or a slope compensation, as used for windings of transformers of various voltages and different power, for example for HVDC transformer coils or HVDC inductors to reduce the electrical load on the edges of the conductors.
  • Windings for transformers with higher voltage and power as well as normal or low voltage and / or power are usually made from round wire, flat wire and / or twisted wire. Due to the small rounding radii of the wires, the inhomogeneity of the electrical field at the start and end of the winding and with larger distances between 2 turns - also simply called "holes" - is very high. To ensure that the windings are cooled, the insulation at these points cannot be arbitrarily designed An increase in the distances is out of the question for economic reasons. However, the electrical inhomogeneities in the electrical field can lead to flashover and thus to a defect in the transformer.
  • a common approach is to reduce the inhomogeneity of the electric field. This is usually done by increasing the rounding radius. Where the radius of curvature cannot be changed or can only be changed with difficulty, the same effect can be achieved by installing one or more shield rings to control the electrical field.
  • the equipotential line plots of a winding with and a winding without a shield ring it was shown that the distance between two equipotential lines, which represents the electrical load and is therefore crucial for the insulation, can be significantly increased by installing a shield ring.
  • shield ring By installing a shield ring, the electrical load on the insulation is considerably reduced and the rest of the insulation structure can be designed in such a way that other boundary conditions, such as cooling of the winding, are guaranteed and the transformer can be built economically by reducing the spacing.
  • known shield ring consists of a carrier material, a so-called core, which is electrically and magnetically non-conductive for this application.
  • an insulating material such as block chipboard, KP wood, plastic, for example phenolic hard fabric, is used for this.
  • This carrier is wrapped and / or coated with a conductive layer to control the electrical field.
  • a copper fabric tape, a so-called Lahn tape, or paper coated with aluminum is used for this.
  • So-called pitch compensation elements are used within the windings and at the transition to the shield ring, which, if necessary, fix the position of the winding and / or the shield ring.
  • a shielding ring of more recent technology is known in which the conductive layer is not realized by a winding with a metallic fabric tape or a metallized paper, but by a conductive layer.
  • the technology for producing the shield rings can of course also be used for other parts, such as pitch compensation elements in the high-voltage transformer.
  • So has a shield ring next to the ring-shaped, electrically and magnetically non-conductive core, which after the DE 10 2016 205 195 according to the latest generation of shield rings and the gradient compensation elements of a transformer on an electrically conductive layer.
  • This electrically conductive layer is electrically connected to the associated winding so that both have the same or a similar potential and is made as thin as possible in order to reduce eddy current losses.
  • this conductive layer must not be closed in order to avoid a short circuit in the winding.
  • the reason for the separation point is that, e.g. in the event of a lightning strike, an increase in voltage on the connection cable of the ring spreads in a ring to both sides and manifests itself in an electrical discharge, which in turn could damage the shield ring.
  • the shield ring and slope compensation technology according to the electrically conductive layer which no longer consists of metal mesh or metal-coated paper, but at least one or more conductive layers, in particular conductive layers that can be produced by spraying, the conventional techniques using paper are used to design the separation point no longer feasible.
  • the object of the present invention is therefore to overcome the disadvantages of the prior art and, in particular, to provide a technical solution, such as on a shield ring according to FIG DE 10 2016 205 195.4 the essential separation point of the first electrically conductive layer is to be generated.
  • the subject matter of the present invention is a screen ring and / or pitch compensation for a transformer, comprising a core with an electrically conductive layer that surrounds the core, this electrically conductive layer being designed as a composite, which at least comprises an insulating polymer matrix with at least one fraction of electrically conductive particles, the electrically conductive filler particles being contained in an amount above the percolation threshold and containing at least one fraction of filler particles which has an average particle size in the range from 500 nm to 100 ⁇ m, the material being the filler particles is selected from the group of the following compounds: metal, carbon, metal oxide, mica, all of the aforementioned compounds as coated or uncoated particles and doped, partially doped or undoped present and / or in any mixtures of the aforementioned compounds, with a band-like, electrically conductive material is provided through which the screen ring can be handled and / or contacted to the winding and / or to ground characterized in that at the point on the shield ring which is exactly opposite the attachment
  • the resistance in the electrically conductive coating at the point of separation is increased by approximately 10 times or more, in particular by 20 times or more.
  • the separation point at which the electrically conductive layer overlaps to the left and right of a sub-area of the shield ring that was originally not electrically conductive coated exactly opposite the cable connection / 50 seconds - i.e. lightning strike - no short circuit is generated.
  • the separation point, or the bridge formed by layer application is loaded with up to 10 kV during the test procedure.
  • Figure 1 shows the longitudinal cross-section of an umbrella ring wrapped with Lahn tape and paper.
  • the longitudinal cross-section can be seen in the area of the separation point, i.e. only a small sub-area of the shield ring opposite the cable connection.
  • the core 1 of the shield ring which is made of pressboard, for example.
  • the electrically conductive layer 2, lying on the core is implemented according to the prior art as a winding made of metallic lath tape, that is to say metallic fabric tape.
  • an insulating paper 3, for example crepe paper is applied to the core.
  • the separation point is thus realized in that the Lahn tape 2 is wrapped once around the screen ring, with an additional approx the underlying Lahn tape winding are electrically separated from each other by a paper winding. This means that the shield ring is a little thicker at this separation point where the lap winding overlaps.
  • Figure 2 shows the same section as Figure 1 , but in the version of an electrically conductive layer of an electrically conductive lacquer, with an approx. 10 ° degree, thus for example 3 to 10 cm, in particular 5 cm wide point 4 can be seen which was not painted, where the surface of the core 1 is uncoated.
  • the electrically conductive layer 5 which is covered by a lacquer according to FIG DE 10 2016 205 195.4 realized is to be recognized.
  • the electrically conductive paint 5 is chosen so that its specific resistance is around 1000 ohms per square.
  • an insulating material - for example a lacquer with high permittivity, as it is from the DE 10 2017 208950.4 is known, coated.
  • this - advantageously sprayable material - has a resistance in ohms per square that is 10 times higher, for example 10,000 ohms per square.
  • Figure 3 is the finished separation point, starting from the first layer with "blank” according to Figure 2 could be realized.
  • FIG Figure 3 the core 1 of the shield ring can also be seen again.
  • FIG. 4 finally it is shown how a separation point is an alternative to the solution according to FIG Figure 3 is designed.
  • the core 1 of the shield ring can be seen again.
  • the electrically conductive first layer 5 lies thereon.
  • the application of the electrically conductive first layer 5 begins in the area 7 of the separation point and the end of the first conductive layer 5 located in this area 7, together with part of the surface of the core 1, with an insulating second layer 6 before the all-round coating of the core 1 with the electrically conductive coating 6 is completed.
  • the separation point is present in area 7, which is characterized by a triple coating, in particular a triple lacquer coating, which can preferably be applied by spraying.
  • the interruption of the first, electrically conductive layer 5 is realized in such a way that at the separation point in the area 7 the two overlapping layers on the first electrically conductive layer 5 are separated from one another by an electrically insulating layer 6, in particular also for a short circuit is avoided.
  • the electrically insulating layer 6 is therefore an intermediate layer in the region 7, by means of which a short circuit of the first electrically conductive layer 5 is avoided.
  • the interruption of the lowermost layer 5, that is to say the one closest to the core is filled by a second, insulating layer 6, which in particular can also be applied by spraying.
  • the second insulating layer 6 is preferably also a composite layer, like them
  • a suitable material for the first layer of electrically conductive material 5 can, for example, from the DE 10 2016 205 195.4 , the content of which is hereby made for disclosure of the present description.
  • the electrically conductive layer is designed as a composite, the at least one insulating polymer matrix with at least a fraction of electrically conductive filler particles comprises, wherein the electrically conductive filler particles are contained in an amount above the percolation threshold and contain at least one fraction of filler particles which has an average particle size in the range from 500 nm to 100 ⁇ m, the material of the filler particles being selected from the group of the following compounds: metal, carbon , Metal oxide, mica, all of the aforementioned compounds as coated or uncoated particles and doped, partially doped or undoped present and / or in any mixtures of the aforementioned compounds.
  • the filler particles are in particular made of noble metal, carbon, soot, carbon tubes, in particular carbon nanotubes, graphite, fullerenes, other carbon compounds that are doped, partially doped or undoped.
  • the material based on metal oxide is, for example, aluminum oxide, mica, metal oxides in binary and tertiary mixed phases, in particular tin oxide, zinc oxide, zinc stannate, titanium oxide, lead oxide, silicon carbide.
  • the thickness of the electrically conductive layer is, for example, in the range less than 200 ⁇ m.
  • the electrically conductive layer preferably has a square resistance of less than / equal to 10 7 ohms.
  • the shape of the filler particles can be selected as desired; isotropic and / or anisotropic particles can be used.
  • anisotropic particles with dimensions in the nanometer range, for example between 1 and 500 nm, are used.
  • platelet-shaped particles can be used, with or without further particle shapes such as spherical particles can be used in combination.
  • a suitable material for the second layer of insulating material can, for example, from the DE 10 2017208950.4 , which have a shield ring with a first electrically conductive coating of the type DE 10 2016 205 195.4 includes, on to which a second, insulating layer is applied as a type of refractive field control.
  • This second insulating layer which can preferably also be applied by spraying, preferably exhibits high permittivity.
  • the material for the insulating, second layer comprises at least one polyesterimide, polyamideimide, polyetherimide, epoxy, polyester, silicone, polyvinyl alcohol and / or glycerine, and any mixtures of the aforementioned classes of compounds as the base polymer.
  • an electrically insulating filler with a high permittivity, but at least a permittivity higher than that of the base resin, for example higher than 3, in particular higher than 6, can be incorporated into this second insulating layer 6.
  • this is a non-conductive ceramic filler such as a filler in the form of a titanate and / or spinel.
  • one or more other fillers in particular mineral fillers, such as, for example, colored pigments, can be incorporated into the base resin for the electrically insulating lacquer of the second layer 6.
  • the filler can be present in several fractions, these can be different in terms of material, shape and / or size of the particles.
  • the insulating layer is, for example, in a layer thickness in the range from 100 ⁇ m to 500 ⁇ m, for example around 300 ⁇ m.
  • the filler can be present in the second layer in a concentration of up to 30% by weight, but preferably less than 15% by weight.
  • the overlap of the second electrically insulating layer 6 in the region 7 of the Figure 4 be approximately 10 cm on the left and 10 cm on the right.
  • the resistance of the second, electrically insulating layer 6 is increased by 10 times compared to the first electrically conductive layer 5, but it can be increased up to 100,000 times compared to the first electrically conductive layer 5.
  • the present invention discloses for the first time how the separation point, which is essential in order to avoid flashovers, can be designed in the new generation of umbrella ring.

Claims (13)

  1. Anneau de protection d'un transformateur, comprenant un noyau (1) ayant une première couche (5) conductrice de l'électricité, qui entoure le noyau (1), dans lequel la première couche (5) conductrice de l'électricité est réalisée sous la forme d'un composite, qui comprend au moins une matrice polymère isolante avec au moins une fraction de particules conductrices de l'électricité, dans lequel les particules de charge conductrices de l'électricité sont contenues en une quantité au-dessus du seuil de percolation et contiennent au moins une fraction de particule de charge qui a une dimension moyenne de particule dans la plage de 500 nm à 100 µm, dans lequel le matériau des particules de charge est choisi dans la groupe des composés suivants : métal, carbone, oxyde métallique, mica, tous les composés mentionnés précédemment sous la forme de particules enrobées ou non enrobées et dopés, dopés partiellement ou non dopés et/ou en n'importe quel mélange des composés mentionnés ci-dessus, dans lequel il est fixé à l'anneau de protection un matériau de type en bande et conducteur de l'électricité pour la connexion de câble à une pièce rapportée par laquelle l'anneau de protection peut être manipulé ou être mis en contact avec la masse, et dans la partie (7) de l'anneau de protection, qui est opposée exactement à la pièce rapportée du matériau de type en bande et conducteur de l'électricité pour la connexion de câble, est prévu un point de séparation, qui représente une interruption de la première couche (5) conductrice de l'électricité de l'anneau de protection.
  2. Anneau de protection d'un transformateur suivant la revendication 1, caractérisé en ce que le point de séparation dans la partie (7) a lieu par une superposition de la première couche (5) conductrice de l'électricité à une strate intermédiaire d'une couche (6) isolante du point de vue électrique pour éviter un court-circuit.
  3. Anneau de protection d'un transformateur suivant la revendication 2, dans lequel la première couche (5) conductrice de l'électricité et/ou la deuxième couche (6) conductrice de l'électricité sont réalisées en un matériau pouvant être pulvérisé.
  4. Anneau de protection d'un transformateur suivant l'une des revendications précédentes, dans lequel le point de séparation dans la partie (7) entoure entre 3 cm à 10 cm de l'anneau de protection.
  5. Anneau de protection d'un transformateur suivant l'une des revendications 2 à 4, dans lequel la couche (6) isolante du point de vue électrique est un vernis d'une permittivité plus grande que 3.
  6. Anneau de protection d'un transformateur suivant la revendication 5, dans lequel la couche (6) isolante du point de vue électrique est un vernis d'une permittivité plus grande que 6.
  7. Anneau de protection d'un transformateur suivant l'une des revendications 5 ou 6 précédentes, dans lequel la deuxième couche (6) isolante du point de vue électrique est réalisée en un vernis à base d'au moins un composé choisi dans le groupe suivant : polyesterimide, polyamidimide, polyétherimide, époxide, polyester, silicone, alcool polyvinylique et/ou glycérine, ainsi que n'importe quel mélange et/ou association des composés mentionnés ci-dessus.
  8. Anneau de protection d'un transformateur suivant l'une des revendications 2 à 7, dans lequel une charge est incorporée dans la deuxième couche (6) isolante du point de vue électrique.
  9. Anneau de protection d'un transformateur suivant la revendication 8, dans lequel la charge dans la deuxième couche (6) isolante du point de vue électrique est présente en une concentration allant jusqu'à 30 % en poids.
  10. Anneau de protection d'un transformateur suivant l'une des revendications 8 ou 9, dans lequel la charge dans la deuxième couche (6) isolante du point de vue électrique est présente en une concentration allant jusqu'à 15 % en poids.
  11. Anneau de protection d'un transformateur suivant l'une des revendications 8 à 10, dans lequel la charge dans la deuxième couche (6) isolante du point de vue électrique se présente en plusieurs fractions.
  12. Anneau de protection d'un transformateur suivant l'une des revendications 2 à 11, dans lequel au moins une charge sous la forme d'un spinelle est présente dans la deuxième couche (6) isolante du point de vue électrique.
  13. Anneau de protection d'un transformateur suivant la revendication 12, dans lequel au moins une charge sous la forme d'un titanate est présente dans la deuxième couche (6) isolante du point de vue électrique.
EP18170346.3A 2017-05-29 2018-05-02 Anneau de protection pour une bobine de transformateur Active EP3410451B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017208980 2017-05-29
DE102017212026.6A DE102017212026A1 (de) 2017-05-29 2017-07-13 Schirmring und/oder Steigungsausgleich für eine Transformatorspule

Publications (2)

Publication Number Publication Date
EP3410451A1 EP3410451A1 (fr) 2018-12-05
EP3410451B1 true EP3410451B1 (fr) 2021-11-17

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EP18170346.3A Active EP3410451B1 (fr) 2017-05-29 2018-05-02 Anneau de protection pour une bobine de transformateur

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2062157A1 (de) * 1970-12-17 1972-06-29 Transformatoren Union Ag Hochspannungsisolationsanordnung für ölgefüllte elektrische Geräte, insbesondere zur Gleichspannungsübertragung
CN101136281B (zh) * 2006-08-28 2011-10-26 Abb技术有限公司 具有屏蔽环的高压变压器、屏蔽环及屏蔽环的制造方法
DE102010009462A1 (de) * 2010-02-26 2011-09-01 Siemens Aktiengesellschaft Verfahren zum Herstellen eines Endenglimmschutzmaterials und ein Endenglimmschutz mit dem Endenglimmschutzmaterial
DE102011008462A1 (de) 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Schirmring für eine HGÜ-Transformatorspule oder eine HGÜ-Drosselspule
DE102011008454A1 (de) * 2011-01-07 2012-07-26 Siemens Aktiengesellschaft Isolationsanordnung für eine HGÜ-Komponente mit wandartigen Feststoffbarrieren
DE102014211122A1 (de) * 2014-06-11 2015-12-17 Siemens Aktiengesellschaft Elektrisch definiert leitfähiges Multifunktionsband, Verfahren zur Herstellung und Verwendung dazu
DE102015209594A1 (de) * 2015-05-26 2016-12-01 Siemens Aktiengesellschaft Widerstandsbelag für einen Glimmschutz einer elektrischen Maschine
DE102016205195A1 (de) 2016-02-02 2017-08-17 Siemens Aktiengesellschaft Schirmring für eine Transformatorspule

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