EP3410451A1 - Anneau de protection et/ou de compensation d'inclinaison pour une bobine de transformateur - Google Patents

Anneau de protection et/ou de compensation d'inclinaison pour une bobine de transformateur Download PDF

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Publication number
EP3410451A1
EP3410451A1 EP18170346.3A EP18170346A EP3410451A1 EP 3410451 A1 EP3410451 A1 EP 3410451A1 EP 18170346 A EP18170346 A EP 18170346A EP 3410451 A1 EP3410451 A1 EP 3410451A1
Authority
EP
European Patent Office
Prior art keywords
electrically conductive
ring
transformer according
insulating layer
electrically insulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18170346.3A
Other languages
German (de)
English (en)
Other versions
EP3410451B1 (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
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102017212026.6A external-priority patent/DE102017212026A1/de
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP3410451A1 publication Critical patent/EP3410451A1/fr
Application granted granted Critical
Publication of EP3410451B1 publication Critical patent/EP3410451B1/fr
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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
    • H01F27/28—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 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 not an option for economic reasons, but the electrical inhomogeneities in the electric field can lead to a 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 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.
  • the distance between two equipotential lines which is the electrical load and thus crucial for the isolation, can be significantly increased by the installation of a shield ring.
  • the according to the DE 10 2011 008 462.2 known shield ring consists of a carrier material, a so-called core, which is electrically and magnetically non-conductive for this application.
  • a carrier material a so-called core, which is electrically and magnetically non-conductive for this application.
  • Is used for this usually an insulating material such as blockboard, KP wood, plastic, such as phenolic hard tissue.
  • This carrier is wrapped and / or coated with a conductive layer to control the electric field.
  • a copper fabric tape, a so-called Lahn band or aluminum-coated paper is used for this purpose.
  • pitch compensation elements are used, which optionally strengthens the position of the winding and / or the shield ring.
  • a shielding ring of newer technology 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 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 in addition to the annular, electrically and magnetically non-conductive core, according to the DE 10 2016 205 195
  • This electrically conductive layer is electrically connected to the associated winding so that both have the same or a similar potential have, and is as thin as possible, 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 a lightning strike, a voltage increase on the connection cable of the ring spreads annularly on both sides and manifests itself in an electrical discharge, which in turn could damage the shield ring.
  • the shield ring and pitch compensation technique according to the electrically conductive layer which is no longer made of metal mesh or metallically coated paper, but at least one or more conductive layers, in particular sprayable manufacturable conductive layers, the conventional techniques using paper for the design of the separation point no longer feasible.
  • Object of the present invention is therefore to overcome the disadvantages of the prior art and in particular to provide a technical solution, as to a shield ring according to the EN 10 2016 205 195.4 the essential separation point of the first electrically conductive layer is to be generated.
  • the subject of the present invention is a shield ring and / or pitch compensation for a transformer comprising a core with an electrically conductive layer enclosing the core, wherein this electrically conductive layer is made as a composite, at least an insulating polymeric matrix comprising at least one fraction of electrically conductive particles, the electrically conductive filler particles being 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 100pm, the material of the filler particles is selected from the group consisting 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 mixtures of the aforementioned compounds, wherein on the shield ring a band-like, is provided electrically conductive material, by which the shield ring can be handled and / or contacted to the winding and / or to ground is characterized in that at the point on the shield ring,
  • the resistance in the electrically conductive coating is increased by approximately 10 times or more, in particular by 20 times or more, at the point of separation.
  • the separation point at the left and right of an originally not electrically conductive coated portion of the shield ring exactly opposite the cable connection the electrically conductive layer overlaps, that they at about 400 or 500 V / mm for 1 / 50 seconds - so lightning - no short circuit generated.
  • the separation point, or the bridge formed by coating is loaded during the test method with up to 10 kV.
  • the separation point according to the in FIG. 1 realized schemas realized.
  • FIG. 1 is the longitudinal cross section of a wound with Lahn band and paper shield ring shown.
  • the longitudinal cross section in the region of the separation point so only a small portion 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 according to the prior art as a winding of metallic Lahn band, ie metallic fabric tape, realized.
  • an insulating paper 3, for example crepe paper, is applied to the core.
  • the separation point thus takes place in that the Lahn band 2 is wound once around the shield ring, wherein after a winding of 360 ° degree in addition to about 20 °, ie for example 7 to 15 cm, in particular 10 cm, are further developed, however the underlying Lahn band winding are electrically separated from each other by a paper winding.
  • the shielding ring is slightly thicker at this point of separation, at which the Lahn winding overlaps.
  • FIG. 2 again shows the same section as FIG. 1 , but in the version of an electrically conductive layer of an electrically conductive paint, wherein an approximately 10 ° degree,
  • an approximately 10 ° degree
  • 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 present uncoated.
  • Right and left of the uncoated point 4 is the electrically conductive layer 5, which by a paint according to the EN 10 2016 205 195.4 realized is to recognize.
  • the electrically conductive lacquer 5 is chosen so that its resistivity is about 1000 ohms per square.
  • an insulating material - for example, a high-permittivity paint, as known from the DE 10 2017 208950.4 is known, coated.
  • this - advantageously sprayable material - has a 10 times higher resistance in ohms per square, so for example 10,000 ohms per square.
  • FIG. 3 is the final separation point, starting from the first layer with "blank” according to FIG. 2 could be realized.
  • the insulating second layer 6 which directly covers the surface of the core 1 in the region 4 of the separation point. This also covers the electrically conductive layer 5 around the region 4.
  • FIG. 3 again to recognize the core 1 of the shield ring.
  • FIG. 4 Finally, it is shown how a separation point as an alternative to the solution according to FIG. 3 is designed.
  • the electrically conductive first layer 5 is applied thereon.
  • the application of the electrically conductive first layer 5 begins in the region 7 of the separation point, and the end of the first conductive layer 5 lying in this region 7 is along with a part of the surface of the core 1 an insulating second layer 6, before the all-around coating of the core 1 with the electrically conductive coating 6 is completed.
  • the separation point is present, which is characterized by a triple coating, in particular a triple, preferably coatable by spraying, paint coating.
  • the interruption of the first, electrically conductive layer 5 is realized in such a way that at the separation point in the region 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 in the region 7 an intermediate layer, by 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 up by a second, insulating layer 6, which can also be applied in particular by spraying.
  • the second insulating layer 6 is preferably also a composite layer, as they are
  • the electrically conductive layer is designed as a composite which comprises at least one insulating polymeric matrix with at least one fraction of electrically conductive filler particles wherein the electrically conductive filler particles are contained in an amount above the percolation threshold and contain at least one fraction of filler particles having an average particle size in the range of 500 nm to 100 .mu.m, wherein the material of the filler particles is selected from the group consisting 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 mixtures of the aforementioned compounds.
  • the filler particles are in particular made of noble metal, carbon, carbon black, carbon tetrabes, in particular carbon nanotubes, graphite, fullerenes, other carbon compounds which are doped, partially doped or undoped.
  • the material based on metal oxide is, for example, alumina, mica, metal oxides in binary and tertiary mixed phase, 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 of less than 200 pm.
  • the electrically conductive layer has a square resistance of less than or equal to 10 7 ohms.
  • the shape of the filler particles is arbitrary, it can be used isotropic and / or anistropically shaped particles.
  • anisotropic particles having a dimension 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 in combination.
  • a suitable material for the second layer of insulating material for example, from DE 10 2017208950.4 comprising a shield ring with a first electrically conductive coating of the type EN 10 2016 205 195.4 includes, on a second, insulating layer is applied as a kind of refractive field control.
  • This second insulating layer which is preferably also applied by spraying, preferably exhibits high permittivity.
  • the material for the insulating, second layer comprises at least one polyesterimide, polyamideimide, polyetherimide, epoxide, polyester, silicone, polyvinyl alcohol and / or glycerol, as well as any mixtures of the abovementioned classes of compounds as the base polymer.
  • this is a nonconductive ceramic filler such as a filler in the form of a titanate and / or spinel.
  • a color pigment from the category cobalt-titanium spinel or else a filler in the form of a titanate with high permittivity, such as barium titanate.
  • one or more other fillers, in particular mineral fillers, such as, for example, color pigments may be incorporated into the base resin for the electrically insulating lacquer of the second layer 6.
  • the filler may be in multiple fractions, these may be different in terms of material, shape and / or size of the particles.
  • the insulating layer is present, for example, in a layer thickness in the range of 100 .mu.m to 500 .mu.m, for example, around 300 .mu.m.
  • the filler may be present in the second layer in a concentration of up to 30% by weight but preferably below 15% by weight.
  • the overlap of the second electrically insulating layer 6 in region 7 of FIG. 4 about 10 cm left and 10 cm 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 to prevent flashovers, can be designed in the new generation of shielding ring.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Laminated Bodies (AREA)
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 true EP3410451A1 (fr) 2018-12-05
EP3410451B1 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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Citations (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
WO2008026992A1 (fr) * 2006-08-28 2008-03-06 Abb Technology Ltd Transformateur de haute tension doté d'un anneau de blindage, anneau de blindage et son procédé de fabrication
EP2362399A1 (fr) * 2010-02-26 2011-08-31 Siemens Aktiengesellschaft Procédé de fabrication d'un matériau anti-effluves d'extrémités et une protection anti-effluves d'extrémités dotée de ce matériau anti-effluves d'extrémités
WO2012093052A1 (fr) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Anneau de protection pour une bobine de transformateur de transmission de courant continu haute tension ou une bobine de réactance de transmission de courant continu haute tension
WO2012093053A1 (fr) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Dispositif d'isolation pour un composant de transmission de courant continu haute tension comportant des barrières aux solides de type paroi
DE102014211122A1 (de) * 2014-06-11 2015-12-17 Siemens Aktiengesellschaft Elektrisch definiert leitfähiges Multifunktionsband, Verfahren zur Herstellung und Verwendung dazu
WO2016188831A1 (fr) * 2015-05-26 2016-12-01 Siemens Aktiengesellschaft Revêtement résistif pour un dispositif anti-effluves d'une machine électrique
DE102016205195A1 (de) 2016-02-02 2017-08-17 Siemens Aktiengesellschaft Schirmring für eine Transformatorspule

Patent Citations (9)

* 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
WO2008026992A1 (fr) * 2006-08-28 2008-03-06 Abb Technology Ltd Transformateur de haute tension doté d'un anneau de blindage, anneau de blindage et son procédé de fabrication
EP2362399A1 (fr) * 2010-02-26 2011-08-31 Siemens Aktiengesellschaft Procédé de fabrication d'un matériau anti-effluves d'extrémités et une protection anti-effluves d'extrémités dotée de ce matériau anti-effluves d'extrémités
WO2012093052A1 (fr) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Anneau de protection pour une bobine de transformateur de transmission de courant continu haute tension ou une bobine de réactance de transmission de courant continu haute tension
WO2012093053A1 (fr) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Dispositif d'isolation pour un composant de transmission de courant continu haute tension comportant des barrières aux solides de type paroi
DE102011008462A1 (de) 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Schirmring für eine HGÜ-Transformatorspule oder eine HGÜ-Drosselspule
DE102014211122A1 (de) * 2014-06-11 2015-12-17 Siemens Aktiengesellschaft Elektrisch definiert leitfähiges Multifunktionsband, Verfahren zur Herstellung und Verwendung dazu
WO2016188831A1 (fr) * 2015-05-26 2016-12-01 Siemens Aktiengesellschaft Revêtement résistif pour un dispositif anti-effluves d'une machine électrique
DE102016205195A1 (de) 2016-02-02 2017-08-17 Siemens Aktiengesellschaft Schirmring für eine Transformatorspule

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