EP3410450A1 - Ring and/or slope compensation for a transformer coil - Google Patents

Ring and/or slope compensation for a transformer coil Download PDF

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Publication number
EP3410450A1
EP3410450A1 EP18161356.3A EP18161356A EP3410450A1 EP 3410450 A1 EP3410450 A1 EP 3410450A1 EP 18161356 A EP18161356 A EP 18161356A EP 3410450 A1 EP3410450 A1 EP 3410450A1
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EP
European Patent Office
Prior art keywords
layer
compensation according
ring
electrically conductive
umbrella ring
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.)
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Application number
EP18161356.3A
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German (de)
French (fr)
Inventor
Dieter Breitfelder
Steffen Lang
Andreas Möhl
Igor Ritberg
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Siemens Energy Global GmbH and Co KG
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Siemens AG
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Publication of EP3410450A1 publication Critical patent/EP3410450A1/en
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Classifications

    • 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
    • H01F27/28—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

Definitions

  • the invention relates to a shield ring and / or a pitch compensation, as they are 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 ladder.
  • Windings for transformers of both higher voltage and power as well as normal or lower voltage and / or power are typically made from round wire, flat wire and / or twisted wire. Due to the small radii of curvature of the wires, the inhomogeneity of the electric field at the beginning of the winding, winding end and at larger distances between 2 windings - also called "holes" - is very high.In order to ensure the cooling of the windings, the insulation can not be made arbitrarily at these points An increase in the distances is out of the question for economic reasons.
  • a common approach is to reduce the inhomogeneity of the electric field. This is usually done by increasing the rounding radius. Where rounding radii can not or only with difficulty be changed, the same effect can be achieved by installing one or more shield rings for controlling the electric field.
  • Such a shield ring is for example from the DE 10 2011 008 462.2 and the EN 10 2016 205 195.4 known.
  • the technique for producing the shield rings is of course applicable to other parts, such as pitch compensation elements in the high voltage transformer.
  • a shield ring on an annular, electrically and magnetically non-conductive core of, for example, chipboard, KP wood and / or plastic, according to the DE 10 2016 205 195 is covered with an electrically conductive layer and is wrapped in practice so far with a metallic Lahn band, which serves to control the electric field.
  • 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 is then repainted to improve overall insulation with further insulation, e.g. wrapped in paper.
  • the lahn tape conventionally used as an electrically conductive layer consists of metallic foils, which in turn have sharp edges. These edges lead to field increases, which in turn can lead to electrical flashovers.
  • the 20 layers of paper will later soak in the transformer with transformer oil. This composite then homogenizes the electric field comparatively like a refractive field control. This application of 20 layers of paper takes a long time and therefore costs a lot.
  • the shield ring according to the EN 10 2016 205 195.4 forms the new generation of umbrella rings.
  • the problem of sharp metallic edges of the Lahn band is significantly reduced from the outset, since the electric field around a painted shield ring is fundamentally more homogeneous.
  • the surface of the painted electrically conductive layer is not ideal, since individual conductive filler particles with their pointed surfaces can protrude from the layer and act there as a kind of field emitter.
  • 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 a shield ring according to the EN 10 2016 205 195.4 can be realized with an additional insulation to avoid inhomogeneities.
  • the subject of the present invention is a shield ring and / or pitch compensation for a transformer comprising a core having a first, electrically conductive, layer enclosing the core, wherein this first, electrically conductive layer is made as a composite, the at least one insulating polymeric matrix comprising at least one fraction of electrically conductive particles, wherein the electrically conductive filler particles are contained in an amount above the percolation threshold and at least one fraction containing filler particles having an average particle size in the range of 500nm to 100 ⁇ m, wherein the material of the filler particles is selected from the group of the following compounds: metal, carbon, metal oxide, mica, all of the abovementioned compounds as coated or uncoated particles and doped, partially doped or undoped present and / or in any mixtures of the abovementioned compounds bonds, characterized in that at least one second insulating layer for field homogenization is provided on the first electrically conductive layer.
  • this second layer can act as a kind of refractive field control and electrical field enhancements, for example, generated by superficial filler particles are homogenized thereby.
  • the degree The field homogenization depends on the layer thickness of the second layer and its permittivity, ie the permeability of the material for electric fields.
  • the material for the second layer so for example the paint, shows a high permittivity.
  • a material based on a plastic which itself has a high permittivity, can be used as a base resin or matrix material.
  • the values of the dielectric constant ⁇ are used.
  • a polyvinyl alcohol has a dielectric constant of 9, whereas epoxy resin has a dielectric constant of only 4.
  • the material for the insulating, second layer comprises at least one polyesterimide, polyamide-imide, polyetherimide, polyvinyl alcohol and / or glycerol, as well as any mixtures of the abovementioned classes of compounds as the base polymer.
  • the base polymers of two successive layers, the electrically conductive first composite layer and at least one second insulating composite layer are soluble in each other, in particular advantageous if they are based on the same chemical class or even belong to the same chemical class ,
  • the adhesion of the two coatings to each other is optimized and minimizes interfacial formation, which serves for further homogenization.
  • the electrical permittivity of the insulating second layer can alternatively or additionally also be significantly influenced by the choice of one or more fillers.
  • some ceramic materials as fillers show a high permittivity, especially some compounds from the group of titanates, such as calcium-copper-titanate -CaCu 3 Ti 4 O 12 -, barium and / or strontium titanate -Ba / SrTiO 3 - Accordingly, here also be used by way of example alone, as mixtures and / or in combination as a filler in the insulating coating.
  • titanates such as calcium-copper-titanate -CaCu 3 Ti 4 O 12 -, barium and / or strontium titanate -Ba / SrTiO 3 -
  • the second layer comprises not only a filler for increasing the permittivity but also at least one further filler, for example for coloring.
  • a dye is incorporated in the second insulating layer disclosed here for the first time.
  • the thickness of the second layer is in the range of 1 ⁇ m to 300 ⁇ m, in particular 100 ⁇ m to 300 ⁇ m.
  • the second insulating layer like the first conductive layer, is applied, for example, by spraying, dipping, brushing, and / or other coating methods.
  • the shield ring and / or the slope compensation according to the present invention can also comprise, in addition to the second insulating layer, additionally one or more paper layers, comparable to the known paper layers of a shield ring and / or a slope compensation for field homogenization.
  • Such, conventionally already known paper layer (s) are made of crepe paper cellulose and / or blockboard and are applied in paper form by wrapping.
  • a shield ring and / or a pitch compensation for a transformer comprising a second insulating layer for field homogenization in addition to an electrically conductive first layer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

Die Erfindung betrifft einen Schirmring und/oder einen Steigungsausgleich, wie sie für Wicklungen von Transformatoren diverser Spannungen und verschiedener Leistung eingesetzt werden, beispielsweise für HGÜ-Transformatorspulen oder HGÜ-Drosselspulen zur Reduzierung der elektrischen Belastung an den Kanten der Leiter. Durch die vorliegende Erfindung werden erstmals ein Schirmring und/oder ein Steigungsausgleich für einen Transformator offenbart, die neben einer elektrisch leitfähigen ersten Schicht eine zweite isolierende Schicht zur Feldhomogenisierung umfassen.The invention relates to a shield ring and / or a pitch compensation, as they are 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 ladder. The present invention discloses for the first time a shielding ring and / or a pitch compensation for a transformer which, in addition to an electrically conductive first layer, comprises a second insulating layer for field homogenization.

Description

Die Erfindung betrifft einen Schirmring und/oder einen Steigungsausgleich, wie sie für Wicklungen von Transformatoren diverser Spannungen und verschiedener Leistung eingesetzt werden, beispielsweise für HGÜ-Transformatorspulen oder HGÜ-Drosselspulen zur Reduzierung der elektrischen Belastung an den Kanten der Leiter.The invention relates to a shield ring and / or a pitch compensation, as they are 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 ladder.

Wicklungen für Transformatoren sowohl höherer Spannung und Leistung als auch normaler oder niedriger Spannung und/oder Leistung werden in der Regel aus Runddraht, Flachdraht und/oder Drilleiter hergestellt. Bedingt durch die kleinen Rundungsradien der Drähte ist die Inhomogenität des elektrischen Feldes am Wicklungsanfang, Wicklungsende und bei größeren Abständen zwischen 2 Windungen - auch einfach "Löcher genannt - sehr hoch. Um die Kühlung der Wicklungen sicherzustellen, kann die Isolation an diesen Stellen nicht beliebig gestaltet werden; eine Vergrößerung der Abstände kommt aus wirtschaftlichen Gründen nicht in Frage.Windings for transformers of both higher voltage and power as well as normal or lower voltage and / or power are typically made from round wire, flat wire and / or twisted wire. Due to the small radii of curvature of the wires, the inhomogeneity of the electric field at the beginning of the winding, winding end and at larger distances between 2 windings - also called "holes" - is very high.In order to ensure the cooling of the windings, the insulation can not be made arbitrarily at these points An increase in the distances is out of the question for economic reasons.

Ein üblicher Lösungsansatz ist es, die Inhomogenität des elektrischen Feldes zu reduzieren. Dies geschieht in der Regel durch eine Vergrößerung des Rundungsradius. Dort wo sich Rundungsradien nicht oder nur schwer verändern lassen, kann die gleiche Wirkung durch den Einbau eines oder mehrerer Schirmringe zur Steuerung des elektrischen Feldes erreicht werden.A common approach is to reduce the inhomogeneity of the electric field. This is usually done by increasing the rounding radius. Where rounding radii can not or only with difficulty be changed, the same effect can be achieved by installing one or more shield rings for controlling the electric field.

Ein derartiger Schirmring ist beispielsweise aus der DE 10 2011 008 462.2 und der DE 10 2016 205 195.4 bekannt. Die Technik zur Herstellung der Schirmringe ist selbstverständlich auch auf sonstige Teile, wie Steigungsausgleichselemente im Hochspannungstransformator anwendbar.Such a shield ring is for example from the DE 10 2011 008 462.2 and the EN 10 2016 205 195.4 known. The technique for producing the shield rings is of course applicable to other parts, such as pitch compensation elements in the high voltage transformer.

So weist ein Schirmring einen ringförmigen, elektrisch und magnetisch nicht leitfähigen Kern aus beispielsweise Blockspan, KP-Holz und/oder Kunststoff auf, der nach der DE 10 2016 205 195 mit einer elektrisch leitfähigen Schicht bedeckt ist und bis jetzt in der Praxis mit einem metallischen Lahnband umwickelt ist, das zur Steuerung des elektrischen Feldes dient. Diese elektrisch leitfähige Schicht wird elektrisch mit der zugehörigen Wicklung verbunden, damit beide das gleiche oder ein ähnliches Potential haben, und wird möglichst dünn ausgeführt, um Wirbelstromverluste zu reduzieren.Thus, a shield ring on an annular, electrically and magnetically non-conductive core of, for example, chipboard, KP wood and / or plastic, according to the DE 10 2016 205 195 is covered with an electrically conductive layer and is wrapped in practice so far with a metallic Lahn band, which serves to control the electric field. 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.

Diese leitfähige Schicht wird dann zur Verbesserung der gesamten Isolation nochmals mit einer weiteren Isolation, z.B. mit Papier umwickelt. Dabei werden herkömmlich um die 20 Lagen Papierband auf die elektrisch leitfähige Schicht gewickelt. Der Grund hierfür ist, dass das herkömmlich als elektrisch leitfähige Schicht eingesetzte Lahnband aus metallischen Folien besteht, die wiederum scharfe Kanten besitzen. Diese Kanten führen zu Feldüberhöhungen, die wiederum zu elektrischen Überschlägen führen können. Die 20 Lagen Papier tränken sich später im Transformator mit Transformatoröl. Dieser Verbundwerkstoff homogenisiert dann das elektrische Feld vergleichsweise wie eine refraktive Feldsteuerung. Diese Aufbringung von 20 Lagen Papier dauert lange und kostet daher viel.This conductive layer is then repainted to improve overall insulation with further insulation, e.g. wrapped in paper. Conventionally, around 20 layers of paper tape are wound onto the electrically conductive layer. The reason for this is that the lahn tape conventionally used as an electrically conductive layer consists of metallic foils, which in turn have sharp edges. These edges lead to field increases, which in turn can lead to electrical flashovers. The 20 layers of paper will later soak in the transformer with transformer oil. This composite then homogenizes the electric field comparatively like a refractive field control. This application of 20 layers of paper takes a long time and therefore costs a lot.

Der Schirmring gemäß der DE 10 2016 205 195.4 bildet die neue Generation an Schirmringen. Bei einem derartigen Schirmring ist die Problematik der scharfen metallischen Kanten des Lahnbandes von vorneherein deutlich reduziert, da das elektrische Feld um einen lackierten Schirmring von Grund auf homogener ist. Trotzdem ist die Oberfläche der lackierten elektrisch leitfähigen Schicht nicht ideal, da einzelne leitfähige Füllstoffpartikel mit ihren spitzen Oberflächen aus der Schicht herausragen können und dort wie eine Art Feldemitter wirken.The shield ring according to the EN 10 2016 205 195.4 forms the new generation of umbrella rings. In such a shield ring, the problem of sharp metallic edges of the Lahn band is significantly reduced from the outset, since the electric field around a painted shield ring is fundamentally more homogeneous. Nevertheless, the surface of the painted electrically conductive layer is not ideal, since individual conductive filler particles with their pointed surfaces can protrude from the layer and act there as a kind of field emitter.

Aufgabe der vorliegenden Erfindung ist es daher, die Nachteile des Standes der Technik zu überwinden und insbesondere eine technische Lösung anzugeben, wie ein Schirmring gemäß der DE 10 2016 205 195.4 mit einer Zusatzisolation zur Vermeidung von Inhomogenitäten realisierbar ist.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 a shield ring according to the EN 10 2016 205 195.4 can be realized with an additional insulation to avoid inhomogeneities.

Diese Aufgabe wird durch den Gegenstand der vorliegenden Anmeldung, wie er in der Beschreibung und den Ansprüchen offenbart ist, gelöst.This object is solved by the subject matter of the present application as disclosed in the specification and claims.

Entsprechend ist Gegenstand der vorliegenden Erfindung ein Schirmring und/oder Steigungsausgleich für einen Transformator, einen Kern mit einer ersten, elektrisch leitfähigen, Schicht, die den Kern umschließt, umfassend, wobei diese erste, elektrisch leitfähige Schicht als Komposit ausgeführt ist, das zumindest eine isolierende polymere Matrix mit zumindest einer Fraktion elektrisch leitfähiger Partikel umfasst, wobei die elektrisch leitfähigen Füllstoffpartikel in einer Menge oberhalb der Perkolationsschwelle enthalten sind und zumindest eine Fraktion Füllstoffpartikel enthalten, die eine mittlere Partikelgröße im Bereich von 500nm bis 100µm hat, wobei das Material der Füllstoffpartikel ausgewählt ist aus der Gruppe folgender Verbindungen: Metall, Kohlenstoff, Metalloxid, Glimmer, alle vorgenannten Verbindungen dabei als beschichtete oder unbeschichtete Partikel und dotiert, teilweise dotiert oder undotiert vorliegend und/oder in beliebigen Gemischen der vorgenannten Verbindungen,
dadurch gekennzeichnet, dass
auf der ersten elektrisch leitfähigen Schicht zumindest eine zweite isolierende Schicht zur Feldhomogenisierung vorgesehen ist.Accordingly, the subject of the present invention is a shield ring and / or pitch compensation for a transformer comprising a core having a first, electrically conductive, layer enclosing the core, wherein this first, electrically conductive layer is made as a composite, the at least one insulating polymeric matrix comprising at least one fraction of electrically conductive particles, wherein the electrically conductive filler particles are contained in an amount above the percolation threshold and at least one fraction containing filler particles having an average particle size in the range of 500nm to 100μm, wherein the material of the filler particles is selected from the group of the following compounds: metal, carbon, metal oxide, mica, all of the abovementioned compounds as coated or uncoated particles and doped, partially doped or undoped present and / or in any mixtures of the abovementioned compounds bonds,
characterized in that
at least one second insulating layer for field homogenization is provided on the first electrically conductive layer.

Wird auf die erste elektrisch leitfähige Schicht, die aus der DE 10 2016 205 195.4 bekannt ist, eine weitere, isolierende Lackschicht aufgebracht, kann diese zweite Schicht als eine Art refraktive Feldsteuerung wirken und elektrische Feldüberhöhungen, beispielsweise durch oberflächlich wirkende Füllstoffpartikel erzeugt, werden dadurch homogenisiert. Der Grad der Feldhomogenisierung ist von der Schichtdicke der zweiten Schicht und deren Permittivität, also der Durchlässigkeit des Materials für elektrische Felder, abhängig.Is applied to the first electrically conductive layer coming out of the EN 10 2016 205 195.4 is known, applied a further, insulating coating layer, this second layer can act as a kind of refractive field control and electrical field enhancements, for example, generated by superficial filler particles are homogenized thereby. The degree The field homogenization depends on the layer thickness of the second layer and its permittivity, ie the permeability of the material for electric fields.

Deshalb ist es vorteilhaft, wenn das Material für die zweite Schicht, also beispielsweise der Lack, eine hohe Permittivität zeigt.Therefore, it is advantageous if the material for the second layer, so for example the paint, shows a high permittivity.

Dabei kann zum einen ein Material auf Basis eines Kunststoffes, der selbst eine hohe Permittivität zeigt, als Basisharz oder Matrixmaterial eingesetzt werden. Zum Vergleich dienen die Werte der Dielektrischen Konstante ε. Beispielsweise hat ein Polyvinylalkohol eine dielektrische Konstante von 9, wohingegen Epoxidharz eine dielektrische Konstante von nur 4 zeigt.In this case, on the one hand, a material based on a plastic, which itself has a high permittivity, can be used as a base resin or matrix material. For comparison, the values of the dielectric constant ε are used. For example, a polyvinyl alcohol has a dielectric constant of 9, whereas epoxy resin has a dielectric constant of only 4.

Beispielhaft umfasst das Material für die isolierende, zweite Schicht zumindest ein Polyesterimid, Polyamid-imid, Polyetherimid, Polyvinylalkohol und/oder Glycerin, sowie beliebigen Mischungen der vorgenannten Verbindungsklassen als Basispolymer.By way of example, the material for the insulating, second layer comprises at least one polyesterimide, polyamide-imide, polyetherimide, polyvinyl alcohol and / or glycerol, as well as any mixtures of the abovementioned classes of compounds as the base polymer.

Nach einer vorteilhaften Ausführungsform der Erfindung sind die Basispolymere zweier aufeinanderfolgender Schichten, der elektrisch leitfähigen ersten Komposit-Schicht und zumindest einer zweiten isolierenden Komposit-Schicht ineinander löslich, insbesondere vorteilhaft ist, wenn sie auf der gleichen chemischen Stoffklasse basieren oder sogar der gleichen chemischen Stoffklasse angehören. Dadurch wird beispielsweise die Haftung der beiden Beschichtungen aufeinander optimiert und Grenzflächenausbildung minimiert, das dient der weiteren Homogenisierung.According to an advantageous embodiment of the invention, the base polymers of two successive layers, the electrically conductive first composite layer and at least one second insulating composite layer are soluble in each other, in particular advantageous if they are based on the same chemical class or even belong to the same chemical class , As a result, for example, the adhesion of the two coatings to each other is optimized and minimizes interfacial formation, which serves for further homogenization.

Die elektrische Permittivität der isolierenden zweiten Schicht kann alternativ oder ergänzend auch maßgeblich durch die Wahl eines oder mehrerer Füllstoffe(s) beeinflusst werden.The electrical permittivity of the insulating second layer can alternatively or additionally also be significantly influenced by the choice of one or more fillers.

Beispielsweise zeigen einige keramische Materialien als Füllstoffe eine hohe Permittivität, insbesondere manche Verbindungen aus der Gruppe der Titanate, wie beispielsweise Calcium-Kupfer-Titanat -CaCu3Ti4O12-, Barium- und/oder Strontiumtitanat -Ba/SrTiO3-, die dementsprechend hier auch beispielhaft allein, als Mischungen und/oder in Kombination als Füllstoff in der isolierenden Beschichtung eingesetzt werden.For example, some ceramic materials as fillers show a high permittivity, especially some compounds from the group of titanates, such as calcium-copper-titanate -CaCu 3 Ti 4 O 12 -, barium and / or strontium titanate -Ba / SrTiO 3 - Accordingly, here also be used by way of example alone, as mixtures and / or in combination as a filler in the insulating coating.

Nach einer vorteilhaften Ausführungsform umfasst die zweite Schicht außer einem Füllstoff zur Erhöhung der Permittivität auch noch zumindest einen weiteren Füllstoff, beispielsweise zur Farbgebung.According to an advantageous embodiment, the second layer comprises not only a filler for increasing the permittivity but also at least one further filler, for example for coloring.

Nach einer vorteilhaften Ausführungsform ist in der hier erstmals offenbarten zweiten isolierenden Schicht ein Farbstoff eingearbeitet.According to an advantageous embodiment, a dye is incorporated in the second insulating layer disclosed here for the first time.

Die Dicke der zweiten Schicht liegt im Bereich von 1µm bis 300pm, insbesondere bei 100µm bis 300pm.The thickness of the second layer is in the range of 1 μm to 300 μm, in particular 100 μm to 300 μm.

Die zweite isolierende Schicht wird, wie die erste leitfähige Schicht, beispielsweise durch Besprühen, Eintauchen, Aufpinseln, und/oder sonstige Beschichtungsmethoden, aufgebracht.The second insulating layer, like the first conductive layer, is applied, for example, by spraying, dipping, brushing, and / or other coating methods.

Der Schirmring und/oder der Steigungsausgleich gemäß der vorliegenden Erfindung kann neben der zweiten isolierenden Schicht auch noch zusätzlich ein oder mehrere Papierlage(n), vergleichbar zu den bekannten Papierlagen eines Schirmrings und/oder eines Steigungsausgleichs zur Feld-Homogenisierung, umfassen.The shield ring and / or the slope compensation according to the present invention can also comprise, in addition to the second insulating layer, additionally one or more paper layers, comparable to the known paper layers of a shield ring and / or a slope compensation for field homogenization.

Derartige, herkömmlich bereits bekannte Papierlage(n) sind aus Krepppapier Cellulose und/oder Blockspan und werden in Papierform durch Umwickeln aufgebracht.Such, conventionally already known paper layer (s) are made of crepe paper cellulose and / or blockboard and are applied in paper form by wrapping.

Durch die vorliegende Erfindung werden erstmals ein Schirmring und/oder ein Steigungsausgleich für einen Transformator offenbart, die neben einer elektrisch leitfähigen ersten Schicht eine zweite isolierende Schicht zur Feldhomogenisierung umfassen.By the present invention for the first time a shield ring and / or a pitch compensation for a transformer disclosed comprising a second insulating layer for field homogenization in addition to an electrically conductive first layer.

Claims (11)

Schirmring und/oder Steigungsausgleich für einen Transformator, einen Kern mit einer ersten, elektrisch leitfähigen, Schicht, die den Kern umschließt, umfassend, wobei diese erste, elektrisch leitfähige Schicht als Komposit ausgeführt ist, das zumindest eine isolierende polymere Matrix mit zumindest einer Fraktion elektrisch leitfähiger Partikel umfasst, wobei die elektrisch leitfähigen Füllstoffpartikel in einer Menge oberhalb der Perkolationsschwelle enthalten sind und zumindest eine Fraktion Füllstoffpartikel enthalten, die eine mittlere Partikelgröße im Bereich von 500nm bis 100µm hat, wobei das Material der Füllstoffpartikel ausgewählt ist aus der Gruppe folgender Verbindungen: Metall, Kohlenstoff, Metalloxid, Glimmer, alle vorgenannten Verbindungen dabei als beschichtete oder unbeschichtete Partikel und dotiert, teilweise dotiert oder undotiert vorliegend und/oder in beliebigen Gemischen der vorgenannten Verbindungen,
dadurch gekennzeichnet, dass
auf der ersten elektrisch leitfähigen Schicht zumindest eine zweite isolierende Schicht zur Feldhomogenisierung vorgesehen ist.Umbrella ring and / or pitch compensation for a transformer, a core having a first, electrically conductive, layer which encloses the core, comprising, this first, electrically conductive layer is made as a composite, the at least one insulating polymeric matrix with at least one fraction electrically conductive particles, wherein the electrically conductive filler particles are contained in an amount above the percolation threshold and at least one fraction containing filler particles having an average particle size in the range of 500nm to 100μm, wherein the material of the filler particles is selected from the group of the following compounds: metal , Carbon, metal oxide, mica, all the aforementioned compounds as coated or uncoated particles and doped, partially doped or undoped present and / or in any desired mixtures of the abovementioned compounds,
characterized in that
at least one second insulating layer for field homogenization is provided on the first electrically conductive layer. Schirmring und/oder Steigungsausgleich nach Anspruch 1,
dadurch gekennzeichnet, dass die zweite isolierende Schicht zur Feldhomogenisierung hinsichtlich einer hohen Permittivität ausgewählt ist.Umbrella ring and / or pitch compensation according to claim 1,
characterized in that the second insulating layer for field homogenization is selected for high permittivity. Schirmring und/oder Steigungsausgleich nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Material für die isolierende, zweite Schicht zumindest ein Polyesterimid, Polyamid-imid, Polyetherimid, Polyvinylalkohol und/oder Glycerin, sowie beliebigen Mischungen der vorgenannten Verbindungsklassen als Basispolymer umfasst.Screen ring and / or pitch compensation according to claim 1 or 2, characterized in that the material for the insulating, second layer comprises at least one polyester imide, polyamide-imide, polyetherimide, polyvinyl alcohol and / or glycerol, and any mixtures of the aforementioned classes of compounds as the base polymer. Schirmring und/oder Steigungsausgleich nach einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass die Basispolymere zweier aufeinanderfolgender Schichten ineinander sehr gut löslich sind.Umbrella ring and / or incline compensation according to one of the preceding claims, characterized in that the base polymers two successive layers are very well soluble in each other. Schirmring und/oder Steigungsausgleich nach einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass die Basispolymere der ersten und zweiten Schicht gleich sind.Umbrella ring and / or pitch compensation according to one of the preceding claims, characterized in that the base polymers of the first and second layer are the same. Schirmring und/oder Steigungsausgleich nach einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass in der zweiten Schicht zumindest ein Füllstoff vorliegt.Umbrella ring and / or pitch compensation according to one of the preceding claims, characterized in that in the second layer is present at least one filler. Schirmring und/oder Steigungsausgleich nach einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass in der zweiten Schicht ein Füllstoff mit hoher Permittivität vorliegt.Umbrella ring and / or incline compensation according to one of the preceding claims, characterized in that in the second layer is a filler with high permittivity. Schirmring und/oder Steigungsausgleich nach einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass in der zweiten Schicht zumindest eine Füllstofffraktion, die Bariumtitanat enthält, vorliegt.Umbrella ring and / or incline compensation according to one of the preceding claims, characterized in that in the second layer at least one filler fraction containing barium titanate is present. Schirmring und/oder Steigungsausgleich nach einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass die Dicke der zweiten Schicht kleiner/gleich 300µm ist.Screen ring and / or pitch compensation according to one of the preceding claims, characterized in that the thickness of the second layer is less than or equal to 300μm. Schirmring und/oder Steigungsausgleich nach einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass auf der zweiten Schicht noch zumindest eine Papierlage zur Feldhomogeniesierung vorgesehen ist.Umbrella ring and / or incline compensation according to one of the preceding claims, characterized in that at least one paper layer for field homogenization is still provided on the second layer. Schirmring und/oder Steigungsausgleich nach einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass die zweite Schicht durch Besprühen herstellbar ist.Umbrella ring and / or pitch compensation according to one of the preceding claims, characterized in that the second layer can be produced by spraying.
EP18161356.3A 2017-05-29 2018-03-13 Ring and/or slope compensation for a transformer coil Withdrawn EP3410450A1 (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008026992A1 (en) * 2006-08-28 2008-03-06 Abb Technology Ltd High voltage transformer with a shield ring, a shield ring and a method of manufacture same
EP2362399A1 (en) * 2010-02-26 2011-08-31 Siemens Aktiengesellschaft Method for producing a glow protection material and a glow protector with the glow protection material
WO2012093052A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Grading ring for an hvdc transformer winding or an hvdc reactor winding
WO2012093055A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Wiring arrangement for hvdc transformer windings or hvdc reactor windings
WO2012093053A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Insulating assembly for an hvdc component having wall-like solid barriers
DE102014211122A1 (en) * 2014-06-11 2015-12-17 Siemens Aktiengesellschaft Electrically defined conductive multifunctional tape, method of manufacture and use therefor
WO2016188831A1 (en) * 2015-05-26 2016-12-01 Siemens Aktiengesellschaft Resistance covering for a corona shield of an electric machine
DE102016205195A1 (en) 2016-02-02 2017-08-17 Siemens Aktiengesellschaft Shield ring for a transformer coil

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE525492C2 (en) 2002-10-22 2005-03-01 Abb Research Ltd Field-controlling polymer matrix provided with filling
WO2012000985A1 (en) 2010-06-28 2012-01-05 Abb Research Ltd Transformer with field control layer arrangement

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008026992A1 (en) * 2006-08-28 2008-03-06 Abb Technology Ltd High voltage transformer with a shield ring, a shield ring and a method of manufacture same
EP2362399A1 (en) * 2010-02-26 2011-08-31 Siemens Aktiengesellschaft Method for producing a glow protection material and a glow protector with the glow protection material
WO2012093052A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Grading ring for an hvdc transformer winding or an hvdc reactor winding
DE102011008462A1 (en) 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Shield ring for a HVDC transformer coil or HVDC choke coil
WO2012093055A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Wiring arrangement for hvdc transformer windings or hvdc reactor windings
WO2012093053A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Insulating assembly for an hvdc component having wall-like solid barriers
DE102014211122A1 (en) * 2014-06-11 2015-12-17 Siemens Aktiengesellschaft Electrically defined conductive multifunctional tape, method of manufacture and use therefor
WO2016188831A1 (en) * 2015-05-26 2016-12-01 Siemens Aktiengesellschaft Resistance covering for a corona shield of an electric machine
DE102016205195A1 (en) 2016-02-02 2017-08-17 Siemens Aktiengesellschaft Shield ring for a transformer coil

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