EP2661760B1 - Schirmring für eine hgü-transformatorspule oder eine hgü-drosselspule - Google Patents

Schirmring für eine hgü-transformatorspule oder eine hgü-drosselspule Download PDF

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Publication number
EP2661760B1
EP2661760B1 EP11807943.3A EP11807943A EP2661760B1 EP 2661760 B1 EP2661760 B1 EP 2661760B1 EP 11807943 A EP11807943 A EP 11807943A EP 2661760 B1 EP2661760 B1 EP 2661760B1
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EP
European Patent Office
Prior art keywords
layer
specific resistivity
grading ring
hvdc
cellulose material
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.)
Not-in-force
Application number
EP11807943.3A
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German (de)
English (en)
French (fr)
Other versions
EP2661760A1 (de
Inventor
Beriz BAKIJA
Dieter Breitfelder
Thomas Hammer
Jens Hoppe
Karsten LOPPACH
Johann Schlager
Frank Heinrichsdorff
Ursus KRÜGER
Volkmar LÜTHEN
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Siemens AG
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Siemens AG
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Publication of EP2661760A1 publication Critical patent/EP2661760A1/de
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Publication of EP2661760B1 publication Critical patent/EP2661760B1/de
Not-in-force legal-status Critical Current
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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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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
    • 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

Definitions

  • the invention relates to a shield ring for a HVDC transformer coil or a HVDC choke coil.
  • This has an annular core with an electrically conductive surface, which normally by an electrically conductive layer on an insulating material such.
  • B. block chip is provided and is electrically isolated at one point of the circumference of the core. The remainder of the core is formed in this case from the block chip material.
  • the shield ring comprises a layer of a cellulosic material, which in particular consists of paper and which completely encloses the core.
  • An umbrella ring of the type specified is, for example, according to the WO 2008/026992 A1 described. Looking at the described cross-section of the shield ring used, it is noticeable that it has a substantially rectangular cross section, which is more or less rounded at all four corners. The two corners, which faces the front end of the coil to be screened, have comparatively small radii. Those corners facing away from the front end of the coil have larger radii. This is necessary because in this area, the paper winding must be made stronger so that it can withstand the stress of the present in this area electric field strength without electrical breakdown.
  • the layer is usually made by a paper wrap.
  • said corners must be made with a larger radius and additional layer thickness such that in this area deposits are wrapped, for example, from paper. This creates a certain manufacturing effort, since the deposits are difficult to handle before wrapping with paper.
  • the oxidizing agent ensures on the one hand for the polymerization of the pyrrole compounds, in addition to an increase in electrical conductivity.
  • the resistivity p of such impregnated cellulosic materials can thus be influenced by the concentration of pyrroles and the nature of the oxidizing agent.
  • nanocomposites can also be used as a field grading material when it comes to reducing peaks in the formation of electric fields, for example on the insulation of electrical conductors.
  • a material consisting of a polymer can be used for this purpose.
  • a filler is distributed whose particles are nanoparticles, so have a mean diameter of at most 100 nm.
  • inter alia semiconducting materials can be used whose band gap is in a range of 0 eV and 5 eV is located.
  • the electrical resistance of the nanocomposite can be adjusted. If, during the admixture of the nanoparticles, a certain proportion of the volume is exceeded, which is between 10 and 20% by volume, depending on the size of the nanoparticles, the specific resistance of the nanocomposite is noticeably reduced, with the result that the electrical conductivity of the nanocomposite is adjusted and can be adapted to the required conditions.
  • I can set a resistivity of the order of 10 12 square meters. This results in a voltage drop across the nanocomposite, which results in a more uniform distribution of the potential and thus also grades the resulting electric field in a suitable manner. As a result, the resulting field peaks can be reduced, which advantageously increases the dielectric strength.
  • the field weakening effect of the nanocomposite here depends on the permittivity of the nanocomposite, the permittivity ⁇ being a measure of the permeability of a material for electric fields.
  • the permittivity is also referred to as the dielectric constant, the term "permittivity" being used below.
  • Only the permittivity figures of the substances used are treated.
  • the WO 2006/122736 A1 also describes a system of cellulosic fibers and nanotubes, preferably carbon nanotubes (hereinafter CNT), in which specific resistances of about 6 to 75 ⁇ m can be set.
  • CNT carbon nanotubes
  • These nanocomposites are to be used, for example, as electrical resistance heating, wherein the conductivity is designed with regard to an ability of the material of the conversion of electrical energy into heat. For this purpose, a sufficient degree of coverage of cellulose fibers with CNT is required.
  • the WO 2006/131011 A1 describes a socket, which may consist inter alia of an impregnated paper wrap.
  • BN is also mentioned among other materials. This can also be used in doped form.
  • the particles should be used with a concentration in the cellulose material below the percolation threshold, so that there is no electrical contact between the particles with each other. For this reason, the specific electrical resistance of the nanocomposite remains essentially unaffected.
  • a nanocomposite comprising semiconducting or nonconducting nanoparticles dispersed in a cellulosic material such as pressboard is known, which can be used as a field grading material in transformers. At least part of the nanoparticles distributed in the cellulosic material have an enclosure of an electrically conductive polymer.
  • a cellulosic material for example, a paper, Cardboard or pressboard can be used.
  • the cellulosic material has a construction of cellulosic fibers which in their entirety make up the bandage forming the cellulosic material.
  • BNNT boron nitride nanotubes
  • electrically conductive polymers in the DE 10 2007 018 540 A1 mentioned polymers find use.
  • electrically conductive polymers include polypyrroles, polyaniline, polythiophenes, polyparaphenylenes, polyparaphenylenevinylenes and derivatives of these polymers mentioned.
  • PEDOT is also sold under the trade name Baytron by Bayer AG.
  • PEDOT is also referred to by its systematic name as poly (3,4-ethylene dioxythiophene).
  • the impregnation consists of a polymer which is crosslinked from a negative ionomer, in particular PSS, and a positively charged ionomer.
  • a positively charged ionomer preferably PEDOT or PANI can be used.
  • PEDOT refers to the already mentioned poly (3,4-ethylene-dioxydthiophene).
  • PANI is polyaniline and PSS is polystyrene sulfonate.
  • the use of negatively charged and positively charged ionomers advantageously makes it particularly easy to produce the cellulosic material.
  • the ionomers can be easily dissolved in water and thus fed to the process of making the cellulosic material, which is also water-based. By crosslinking the ionomers following preparation of the cellulosic material, the resistivity of the cellulosic material can be lowered.
  • the ionomers polymerize and form in the cellulosic material an electrically conductive network which is responsible for the reduction of the resistivity.
  • the mentioned ionomers can also be used to coat already mentioned semiconducting or non-conducting nanoparticles.
  • the nanocomposite can also be impregnated with semiconducting nanoparticles which are at least partially made of BNNT and distributed in the cellulose or a polymer.
  • semiconducting nanoparticles which are at least partially made of BNNT and distributed in the cellulose or a polymer.
  • a doping of this BNNT with suitable dopants or a coating with metals or doped semiconductors is provided on the BNNT.
  • the concentration of the BNNT can be chosen such that the nanocomposite has a specific conductivity p of the order of 10 12 ⁇ m. According to this variant, no conductive polymers are used as a sheathing of the BNNT.
  • Doping can be achieved by modifying the BNNT by adding suitable dopants such that the dopant atoms form electronic states that will make the BNNT a p-conductor (ie, electronic states that capture electrons from the valence band edge ) or to an n-conductor (ie, reaching electronic states that emit electrons by thermal excitation across the conduction band edge).
  • a dopant for a p-doping for example Be comes into question
  • a dopant for n-doping Si comes into question.
  • Such doping of the BNNT can be done in situ, during the growth of the BNNT z. B. from the gas or liquid phase, the dopant atoms to be built in.
  • the doping in a further step after the growth of the BNNT, wherein the dopants are typically taken up by the BNNT under the influence of a heat treatment.
  • the resistivity can be lowered to values typical for doped semiconductors between 0.1 and 1000 ⁇ cm.
  • the nanocomposite made of cellulosic material can also be impregnated with semiconducting nanoparticles, wherein a doping of these nanoparticles with dopants is also provided to increase the effective conductivity of at least part of the nanoparticles distributed in the insulating material.
  • the use of the semiconducting nanoparticles, in particular BNNT has the advantage that low filler contents of at most 5% by volume, preferably even at most 2% by volume, in the insulating material are sufficient to cause percolation of the nanoparticles and thus increase the electrical conductivity of the nanocomposite.
  • an insulation arrangement for HVDC systems which has several solid barriers, for example. From pressboard. These may be provided with a graded electrical conductivity, wherein the solid barriers having the highest electrical conductivity are respectively arranged at the end of the Isolierrange at which the field lines of the electric field have the smaller radii of curvature.
  • the end faces of transformer coils are equipped with shield rings can. These have an annular core, which may be surrounded by an insulating material.
  • the shield ring can be provided with holes.
  • Umbrella rings for transformer coils are described. These can be designed so that an electrical insulation is provided only on the side facing away from the transformer coil.
  • the object of the invention is to further develop a shield ring of the type specified at the beginning in such a way that the safety against electrical breakdowns on the layer of cellulose material is improved.
  • the layer is designed as a composite consisting of a treated cellulosic material in the particles in comparison with the specific resistance ⁇ p of the untreated cellulose material lower resistivity in one Concentration above the percolation threshold are distributed.
  • a coherent network of a conductive polymer with a lower specific resistance than the specific resistance ⁇ p of the untreated cellulose material pervades the composite.
  • the treated cellulosic material can be obtained in the manner already described above and either produced as a shaped body, in which the annular core of the shield ring is inserted. Another possibility is to produce papers as treated cellulose material and then to wrap these with the core in a manner known per se, resulting in the layer of the cellulose material from the winding.
  • HVDC components are understood to mean those components which are used to transmit high-voltage direct currents and contain current-carrying elements (HVDC means high-voltage DC transmission).
  • HVDC means high-voltage DC transmission
  • transformers or chokes are required as HVDC components.
  • cable routing for the electrical connection of various HVDC components are required.
  • Further HVDC components are disconnection points in such cable guides or bushings through housing components in which other HVDC components are housed.
  • leading to high-voltage direct currents occur, for example, in transformer and choke coils and alternating currents.
  • the HVDC components in the context of this invention should be suitable for transmitting high-voltage direct currents of at least 100 KV, preferably for the transmission of high-voltage direct currents of more than 500 KV.
  • the inventive design of the treated cellulosic material has the advantage that the specific resistance of the resulting composite ⁇ comp compared to the resistivity ⁇ p of the untreated cellulose material is reduced. In this way it can be achieved that the specific resistance of the composite ⁇ comp approaches that of the oil ⁇ o or, as will be explained in more detail below, even exceeds it. This ensures that in the case of application of a DC voltage at the formed by the shield ring Isolierrange for the HVDC coil (ie HVDC transformer coil or HVDC choke coil) a voltage drop is better distributed to the components of the cellulosic material and the transformer oil. On the one hand, namely the transformer oil can cope with a higher voltage drop, without causing electrical breakdowns.
  • HVDC coil ie HVDC transformer coil or HVDC choke coil
  • a relief of the cellulosic material leads to the fact that the security against breakdowns is increased here or a paper winding or another layer produced on the shield ring can be made thinner.
  • a load can advantageously be greatly reduced, so that it is important to underlay the winding with another insulation material (in particular cellulosic material). can be waived.
  • the specific resistance ⁇ comp of the composite is at most 5 times 10 13 ⁇ m at least on the surface of the shield ring.
  • the described, for the invention essential effect of a relief of the cellulosic material by the voltage drop takes place to a greater extent on the transformer oil can be Advantageously good use, if the specific resistance ⁇ comp of the composite is at most 5 times 10 13 ⁇ m.
  • a specific resistance ⁇ comp of the composite which is 1 to 20 times the specific resistance ⁇ o of the transformer oil. It can be provided particularly advantageously that the specific resistance ⁇ comp of the composite corresponds, on the order of magnitude, to the specific resistance of transformer oil.
  • order of magnitude it is meant that the specific resistance ⁇ comp of the composite differs by at most an order of magnitude from that of the transformer oil (ie at most by a factor of 10).
  • the specific resistances ⁇ o , ⁇ p and ⁇ comp in the context of this invention should each be measured at room temperatures and a prevailing reference field strength of 1 kV / mm. Under these conditions, the resistivity ⁇ o is between 10 12 and 10 13 ⁇ m. It should be noted, however, that the specific resistance ⁇ o of transformer oil is rather reduced in the case of an inventive heavier load due to the voltage drop across the transformer oil. In the embodiments described in more detail below, it is therefore assumed that a specific resistance ⁇ o in the transformer oil of 10 12 ⁇ m.
  • the specific resistance ⁇ comp of the composite on the surface of the shield ring it is important that the specific resistance of the transformer oil ⁇ o is not significantly undercut in this range. As a result, as already described, an equalization of the electrical load on the transformer oil and the cellulosic material can take place. However, it is also advantageously possible for the specific resistance of the cellulose material of the shield ring to increase with increasing distance from the surface of the shield ring decreases further (even to values below ⁇ o ), so that in this area a targeted distribution of the field strength is made possible. This contributes particularly advantageously to a reduction in the electrical stress in the region of the above-mentioned rounded corners of the cross section.
  • the resistivity of adjacent layer layers forming the layer is graded, with the layer layer or the layer layers having the lowest specific resistance being applied to the core adjoin.
  • the layers can be formed, for example, by windings with differently impregnated papers. It is then applied to the core first the layer layer with the lowest specific resistance ⁇ comp and then at least one layer layer with a higher resistivity ⁇ comp , wherein advantageously the last layer forming the surface of the end ring, at least the order of magnitude of the specific resistance of transformer oil can correspond.
  • regions of the layer thickness are understood which are each equipped with the same specific resistance ⁇ comp .
  • this layer layer can be formed by a plurality of paper layers. In this case, so many paper layers (winding layers) are wound that the desired thickness of the layer layer is achieved.
  • the shield ring with regions of different specific resistance ⁇ comp , in that it is made up of a plurality of concentrically nested single rings, wherein the inner single ring with a cellulosic material with a smaller specific resistance is provided as the outer single ring or several subsequent individual rings.
  • only two individual rings are used particularly advantageously.
  • the individual rings together form the shield ring in the sense of the invention, even if they are structurally not connected to each other.
  • the umbrella ring in the sense of the invention is therefore to be understood as meaning the entire assembly, which is provided in the area of the front ends of the coils and has a typical shield ring structure.
  • the inner ring with a lower resistivity than the outer ring.
  • the already described electrical stress on the rounded, the front end of the coil facing away corners of the cross section of the shield ring is on the inside of the coil namely higher than on the outside. This can be taken into account in the design of the cellulosic material used on the shield ring.
  • an impregnation of the cellulosic material with a lower concentration is advantageously adjustable for the outer single ring, whereby in particular material costs can be saved.
  • a particular embodiment of the invention provides that the layer of cellulose material around the entire perpendicular to the ring profile lying cross-section is made substantially the same thickness.
  • This embodiment is, as already explained, made possible by the fact that according to the invention the specific resistance of the cellulosic material to the requirements of a field grading is adjusted so that the electrical stress is better distributed over the individual areas of the shield ring and the surrounding transformer oil.
  • the cellulosic material should also be understood to mean a layer of the shielding ring that is created solely by wrapping a paper strip around the core. In this case, it is natural that the wound layer on the inside of the ring is slightly thicker than on the outside of the ring, because here the adjacent winding loops of the paper used overlap somewhat more. In essence, however, considering the diameter of the core to be wrapped, a wound layer should be considered as having substantially the same thickness.
  • Another embodiment of the invention is obtained when the layer of cellulosic material rests directly on the core around the entire cross section lying perpendicular to the ring profile.
  • the manufacturing cost can be reduced by saving additional deposits. As a result, not only the production cost is reduced, but it is also a higher process reliability achieved because it dispenses with a deposit that might slip during winding, for example.
  • the height h of the shielding ring is reduced in comparison to the required height when using the relevant untreated cellulose material instead of the composite.
  • the thickness s of the layer is reduced compared to the required thickness when using the relevant untreated cellulose material instead of the composite.
  • the shielding ring has a rectangular cross section with rounded corners lying perpendicular to the ring profile, wherein the radius r of these rounded corners is reduced compared to the required radius using the respective untreated cellulosic material instead of the composite.
  • An electrical insulating section 18 generally consists of several layers of cellulosic material 19, between which oil layers 20 may lie.
  • the insulating section begins at the metallic surface 11 of a component 12 to be insulated, which may be formed for example by a metal layer 13 on the core of a shield ring, not shown.
  • the cellulosic material 19 is impregnated with oil, which in FIG. 1 not shown in detail. This is in FIG. 1 to recognize an impregnation 11 within the cellulosic material.
  • the according to FIG. 1 shown insulation surrounds, for example, in a transformer there used windings that need to be electrically insulated to the outside and each other.
  • the electrical insulation of a transformer must prevent electrical breakdowns in the event of an AC voltage being applied.
  • the isolation behavior of the insulation depends on the permittivity of the components of the insulation.
  • the permittivity ⁇ o is approximately 2, for the cellulosic material ⁇ p at 4.
  • the load on the individual insulation components results in the voltage U o applied to the oil being approximately twice as high , such as the voltage U p applied to the cellulose material.
  • the impregnation 11 does not influence the stress distribution in the insulation according to the invention since the permittivity ⁇ BNNT is also approximately 4, and therefore the permittivity ⁇ comp of the impregnated cellulosic material is also approximately 4 lies.
  • the voltage U o applied to the oil is approximately twice as great as the voltage U comp applied to the nanocomposite (cellulosic material).
  • the breakdown strength of the insulation in the case of HVDC components when DC voltages are present is also important.
  • the distribution of the applied voltage to the individual insulation components is then no longer dependent on the permittivity, but on the resistivity of the individual components.
  • the specific resistance ⁇ o of oil is between 10 13 and 10 12 ⁇ m.
  • a greater part of the voltage drop to relieve the cellulosic material in the oil should take place and that the specific resistance of the oil itself is reduced in the case of concern of a tension, rather, as in Fig. 1 shown to start from a resistivity ⁇ o of 10 12 ⁇ m.
  • ⁇ p of cellulose material is three orders of magnitude higher and is 10 15 ⁇ m.
  • the inventively introduced into the cellulosic material 19 impregnation 11 may, for. B. from BNNT and is adjusted by a suitable coating of BNNT from PEDOT: PSS and possibly by an additional doping of the BNNT with dopants with their resistivity (between 0.1 and 1000 ⁇ cm), that the specific resistance of the cellulose material ⁇ p is lowered.
  • PEDOT: PSS or the sole use of BNNT.
  • the voltage U o applied to the oil is of the order of magnitude in the region of the voltage U comp applied to the composite, so that a balanced voltage profile is established in the insulation.
  • the dielectric strength of the insulation is advantageously improved, since the load on the cellulosic material is noticeably reduced.
  • FIG. 2 is the section of a HVDC transformer to see. This is housed in a designated as boiler 21 housing. Also indicated are a high voltage coil and a low voltage coil whose windings 22, 23 in FIG. 2 can be seen. A transformer core 14 is shown only schematically for the sake of clarity.
  • an electric field is represented by field lines 33 extending on equipotential surfaces of the electric field.
  • This electric field is influenced by various elements of an insulation arrangement which, as elements, include segmented shielding rings 24, 25, cylindrical solid material barriers 26 made of pressboard, and angle rings 27 also made of pressboard.
  • the shield rings 24, 25 have a core 28 with a metallic surface 29 and a paper winding 30.
  • the interior space 31 is filled with a filling of transformer oil, which therefore also flows into the gaps 32 between the individual elements of the insulation arrangement and fills them.
  • the field lines 33 also penetrate a pressure ring 34 of block chip.
  • the pressure ring 34 can also be modified to influence the electric field which is being formed in this area.
  • the pressure ring 34 together with a not shown winding table, which can also be made of block chip and the windings 22, 23 carries, for a mechanical cohesion of all modules (including the solid barriers).
  • the pressure ring 34 and the winding table, not shown, are to be understood as elements of the isolation route.
  • the shield ring 24 consists of an inner single ring 35 and an outer single ring 36.
  • the shield ring 24 has a height h and a thickness s of the layer 30, as shown is.
  • FIG. 3 is also indicated with dashed contour lines, as the geometry of a not equipped with impregnated cellulose material shield ring could look high in comparison.
  • the layer of the inner single ring 35 consists of several layer layers 37, 38.
  • the layer layer 37 forming the surface of the shield ring 24 and the layer 30 of the outer single ring 36 have a specific resistance which corresponds to that of the surrounding transformer oil of the order of magnitude.
  • the resistivity of the layer layer 38 adjacent to the core 28 is further reduced, so that this resistivity falls below that of the transformer oil. This results in a relief of the area of the shield ring 24, which is the most stressed by the voltage drop of a HVDC voltage. This is due to the inner with respect to the annular course of the shield ring inner corner of the cross section of the shield ring, which faces away from the coil.
  • the inner single ring 38 For the other regions of the inner single ring, it would not be necessary to reduce the specific resistance of the near-nuclear layer layer 38 per se. However, this is not harmful, so that for manufacturing reasons, the inner single ring 38 is completely wrapped with the core-near layer layer 38. In the outer single ring 36, however, the additional wrapping with a material having a resistivity below that of transformer oil is omitted for reasons of cost. Here a reduction of the specific resistance on the order of magnitude of the value of the transformer oil suffices.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Paper (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)
EP11807943.3A 2011-01-07 2011-12-27 Schirmring für eine hgü-transformatorspule oder eine hgü-drosselspule Not-in-force EP2661760B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011008462A DE102011008462A1 (de) 2011-01-07 2011-01-07 Schirmring für eine HGÜ-Transformatorspule oder eine HGÜ-Drosselspule
PCT/EP2011/074082 WO2012093052A1 (de) 2011-01-07 2011-12-27 Schirmring für eine hgü-transformatorspule oder eine hgü-drosselspule

Publications (2)

Publication Number Publication Date
EP2661760A1 EP2661760A1 (de) 2013-11-13
EP2661760B1 true EP2661760B1 (de) 2018-07-11

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EP (1) EP2661760B1 (pt)
CN (1) CN103415901B (pt)
BR (1) BR112013017401B1 (pt)
DE (1) DE102011008462A1 (pt)
WO (1) WO2012093052A1 (pt)

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DE102016205195A1 (de) * 2016-02-02 2017-08-17 Siemens Aktiengesellschaft Schirmring für eine Transformatorspule
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DE102017207009A1 (de) 2017-04-26 2018-10-31 Siemens Aktiengesellschaft Schirmring für eine Transformatorspule
DE102017212026A1 (de) 2017-05-29 2018-11-29 Siemens Aktiengesellschaft Schirmring und/oder Steigungsausgleich für eine Transformatorspule
EP3410451B1 (de) 2017-05-29 2021-11-17 Siemens Energy Global GmbH & Co. KG Schirmring für eine transformatorspule
DE102017208950A1 (de) 2017-05-29 2018-11-29 Siemens Aktiengesellschaft Schirmring und/oder Steigungsausgleich für eine Transformatorspule
CN110737998B (zh) * 2019-09-25 2022-07-26 中国电力科学研究院有限公司 一种基于有限元和深度信念网络的均压环优化设计方法
CN112528534B (zh) * 2020-11-19 2024-05-28 南方电网科学研究院有限责任公司 直流分压器的表面最大电场强度的获取方法、系统及装置
EP4160631A1 (en) * 2021-04-26 2023-04-05 Delta Electronics, Inc. Planar winding structure for power transformer

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BR112013017401A2 (pt) 2016-10-04
CN103415901A (zh) 2013-11-27
CN103415901B (zh) 2017-05-17
EP2661760A1 (de) 2013-11-13
WO2012093052A1 (de) 2012-07-12
DE102011008462A1 (de) 2012-07-12
BR112013017401B1 (pt) 2020-09-29

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