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WO2025157453A1 - Transformateur - Google Patents

Transformateur

Info

Publication number
WO2025157453A1
WO2025157453A1 PCT/EP2024/083924 EP2024083924W WO2025157453A1 WO 2025157453 A1 WO2025157453 A1 WO 2025157453A1 EP 2024083924 W EP2024083924 W EP 2024083924W WO 2025157453 A1 WO2025157453 A1 WO 2025157453A1
Authority
WO
WIPO (PCT)
Prior art keywords
winding
core
reducer
transformer according
eddy
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.)
Pending
Application number
PCT/EP2024/083924
Other languages
English (en)
Inventor
Lorenzo CANTINI
Gianluca BUSTREO
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.)
Hitachi Energy Ltd
Original Assignee
Hitachi Energy Ltd
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
Application filed by Hitachi Energy Ltd filed Critical Hitachi Energy Ltd
Publication of WO2025157453A1 publication Critical patent/WO2025157453A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic 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
    • H01F2027/348—Preventing eddy currents

Definitions

  • the presentdisclosure relatesto atransformer,in particular to a transformer for application in power grid syst ems, for example itrelatesto high voltage transformers.
  • Transformers are used in powersystemsforvoltage level control.
  • a transformer is used to st ep up and step down voltage in electric power systems in orde r to transmitand utilize electricalpower.
  • US 10658106 B2 relates to a safe stationary induc tion electrical apparatus that prevents a fragment comin g off a magnetic shield, wound around an iron core leg port ion of the stationary induction electrical apparatus, due to v ibrations from being released in a tank accommodating the sta tionary induction electricalapparatusand thuspreventsa trouble such asdielectricbreakdown.
  • US 2018/358160 A1 relates to a stationary induction apparatus that includes: an iron core; a winding wound outsid e of the iron core; a plurality of iron core clamps that san dwich the winding from a longitudinal direction of the iron c ore; a magnetic material ring configured with a silicon st eel plate wound outside of the iron core; a laminated magneti c material composite ring thatincludesan insulatorprovided on an outer circumference of the magnetic material ring t hat includes an electrical conductor provided on an out er circumference of the insulator, and that is dispose d between the winding and each of the iron core clamps; and a holding- P2023,1496 WO N /P230155WO01 November28,2024 -2 - and-cooling structure disposed between the winding and the laminated magneticmaterialcomposite ring.
  • US 2011/316662 A1 relates to winding arrangement fo r a transformer or for a reactor.
  • the winding arrangeme nt includesan annularwinding coverpartdisposed on the front face of a winding, wherein a side surface of the wi nding cover part overlaps a front surface of the winding, wherein the annular winding cover part is designed to be ma gnetically conductive at least in a partial area and comprises a convex side surface facing awayfrom the winding.
  • WO 2017/134040 A1 relatesto a shielding ring used for windings of transformers for reducing the electrica l load at the edgesofthe conductors.
  • a shielding ring comprises an electricallyconductive layer.
  • a combination of a polymer matrix and fillers as th e electrically conductive layer are proposed, by mean s of which combination the resistance of the electrically cond uctive layer of a shielding ring can be set exactly as nee ded and thus the correct resistance of the electrically con ductive layer can be realized according to the application. It is desirable to provide a transformer that can b e operated reliably.
  • Embodiments of the disclosure relate to a transform er.
  • the transformer comprises a core.
  • the transformer compr ises a winding.
  • the winding is wound around a winding axis extending along the core.
  • the transformer comprises an eddy l osses reducer.
  • the eddylossesreducer isarranged atan axialend of the winding.
  • the eddy losses reducer in the fol lowing also called “reducer”, comprises a non-ferromagneti c main P2023,1496 WO N /P230155WO01 November28,2024 -3 - body.
  • the reducer comprisesa ferro-magneticlayer surrounding the main body.
  • radial flux generate axial forces . For example, these forces cause vibration and resulting noises.
  • radial flux leads to losses and hotspo ts.
  • the eddy losses reducer is arranged to reduce losses, h otspots and thus also forces. Due to the eddy losses reduce r, the magnetic flux generated by the winding generates le ss eddy losses in conductors of the winding and thus less a xial forces as well.
  • the eddy losses reducer is arranged at the axial end, where radial flux is higher and tends to go out from the winding and reach the core or the tank. Th is is reduced by the eddy losses reducer. Thus, losses an d hotspots generated by the radial flux at the end of the wind ing are reduced.
  • the eddy losses reducer which can also be called “ magnetic fluxcollector”,isused to reduce the eddyradial lossesin the winding and/or the exposed area of the core.
  • the eddy losses reducer can an integral part of an equipotential ring which is arranged at the axia l end of the winding.
  • the equipotentialring isextended by an eddy losses reducing functionality. Therefore, the ferro magnetic layer is provided which surrounds the non-ferromagn etic main body.
  • the ferromagnetic layer comprise s iron or anotherferromagneticmetalormaterial.
  • the eddy losses reducer comprises a ring segment sh ape.
  • the eddy losses reducer comprises an opening where two ends of the eddy losses reduce r are arranged opposite each otherand are arranged ata distance from each other.
  • the eddy losses reducer is interru pted at P2023,1496 WO N /P230155WO01 November28,2024 -4 - the opening.
  • the ring segmentshape maybe circular orelliptic.
  • the ferromagnetic layer c omprises a thickness between 50 ⁇ m and 9 cm. Other thicknesses are possible, in particular between 25 ⁇ m and a few cen timeters.
  • the ferromagnetic layer c omprises a metal strip.
  • the metal strip is rolled around the main body.
  • the metal strip compris es one iron sheet or more iron sheets.
  • the me tal strip consists of an iron sheet or a plurality of iron sh eets.
  • the iron sheets are rolled around the non- ferromagnetic main body.
  • the metal str ip comprises a thickness between 50 ⁇ m and 9 cm in a v ertical direction ofthe metalstrip,wherebythe vertical direction is thinner than the two transverse directions, whic h are aligned perpendicular to the vertical direction.
  • the iron sheet is made of ferromagnetic material.
  • the iron sheet compriese electricalsteel like the one used to produce transformer cores and including amorphous ones.
  • the transformer can compr ise an adhesive connection to fix the metal strip.
  • the adhesive connection fixes the metal strip to the ma in body. The adhesive connection can be useful to restrict t hemovement of the metal strip during operation.
  • the adhesive c onnection is configured to reduce vibrations of the metal str ip, if P2023,1496 WO N /P230155WO01 November28,2024 -5 - needed.
  • the metal strip which is rolled around the main body,isglued to reduce vibrations.
  • the main body comprises a n electrically insulating material.
  • the main body is, for example, made of a non-ferromagnetic electrically i nsulating material to not, or only insignificantly, influence the magnetic field generated by the winding.
  • the main body comprises at least one of wood and plasti c.
  • the main body consistsofatleastone of wood and plastic.
  • the main body is made of lami nated wood ortransformerboard.
  • the eddy losses reducer c omprises a covering layer.
  • the covering layers urroundsthe ferromagnetic layer.
  • the ferromagnetic layer is arranged between the covering layer and the main bo dy.
  • the covering layer protects the ferromagnetic layer and /or forms an electrical insulation.
  • the covering layer isused to smooth the surface.
  • the covering layer comprisesatleast one of paper, textile, and plastic.
  • the cover ing layer comprisescrepe paper.
  • the covering layer compri ses a carbon layer and/or a further metallic layer.
  • the carbon layerand/orthe furthermetalliclayer isformed as a coating of the covering layer.
  • the carbon laye r and/or further metallic layer faces the ferromagnetic laye r.
  • the covering layer comprises several layer s.
  • the covering layer comprises a paper layer , a carbon and/or metallic layer, and a further paper layer.
  • the carbon layer and/or the further metall ic layer is used to keep the voltage of the eddy losses redu cer at a defined voltage during operation.
  • the winding is arranged d irectly adjacent to and at a distance to the core.
  • the transformer comprises a further eddy losses reducer.
  • the further eddy losses reduce r is designed correspondingly to the eddy losses reducer , for example.
  • the further eddy losses reducer is arrange d at a further axial end of the winding.
  • the further axial end is arranged axially opposite the axial end.
  • a respective eddy losses reducer is arranged to reduce eddy losses and/or collect the magnetic f lux at both axialends.
  • the transformer comprises a plurality of windings around the core.
  • respective eddy losses reducers are arranged on eac h of the windings.
  • respec tive eddy lossesreducers are arranged onlyon a partofthe windings.
  • the respective eddy losses reducer i s arranged on the windings, which are arranged facing the core . For example, windings that are arranged facing away fro m the core do not have an eddy losses reducer.
  • th e eddy losses reducers are arranged on the windings with t he smallest radii and not on windings with a larger ra dius which are arranged furtherawayfrom the core.
  • the eddy losses reducer s are arranged coaxially to the core.
  • the ed dy losses reducers of the plurality of eddy losses reducers c omprises a common centerin a ready-to-operate condition.
  • the transformer compris es a second core.
  • the transformer comprises a second win ding wound around a second winding axis extending along the se cond core.
  • the transformer comprises a second eddy losses redu cer.
  • the second eddy losses reducer for example, is designe d correspondingly to the first eddy losses reducer.
  • T he second eddylossesreducerisarranged atan axialend of the second winding. It is possible that one eddy losses reduce r surrounds the first core and a second eddy losses r educer surrounds the second core. It is possible that a pl urality of eddy losses reducers surrounds the first core and a further plurality of eddy losses reducers surrounds the sec ond core.
  • respective eddy losses reducers are arranged on both axialendsofthe windingsaround the first core, or at just one single axial end.
  • respective second edd y losses reducers are arranged at both axial ends of the sec ond windings around the second core, or at just one sin gle axial end ofthe second windings.
  • the winding is a primary winding or a secondary winding.
  • the tr ansformer comprises a tertial winding, which is arranged with out an eddylossesreducer.
  • Figure 1 shows a schematic cross-section of a trans former according to an embodiment.
  • Figures 2 to 4 show different views of an eddy loss es reducer according to an embodiment.
  • Figure 1 schematically shows parts of a transformer 100.
  • the transformer 100 is enclosed in a tank (not explicit ly shown) which, for example, is filled with a dielectric flu id.
  • the transformer 100 comprises a first core 101 and a se cond core 121. Windings 102, 103, 104 are arranged around the first core 101.
  • windings 122, 123, 124 are arrang ed around the second core 121.
  • the firstcore 101 and the windings 102, 103, 104 are symmetric around a w inding axis105.
  • the second core 121 and the P2023,1496 WO N /P230155WO01 November28,2024 -9 - windings 122, 123, 124 are symmetric around a secon d winding axis125.
  • the winding 102 extendsalong the winding axis105 and terminates in an axial end 106 and an opposite axia l end 107.
  • the winding 103 ends in an axial end 108 and an opp osite axial end 109.
  • the windings 122 and 123 correspondi ngly terminate in respective axial ends 126, 127, 128, 1 29.
  • the winding 102 has a smaller diameter than the rem aining windings 103, 104, which are arranged around the fi rst core 101.
  • the coil 102 is located closest to the first c ore 101.
  • the winding 102 isarranged ata distance 150 from the first core 101.
  • the windings 122 has a smaller diameter than the re maining windings 123, 124, which are arranged around the se cond core 121.
  • the coil122 islocated closestto the second core 121.
  • the transformer 100 comprises an eddy losses reduce r 200 which is arranged at the axial end 106 of the windi ng 102.
  • eddy losses reducers 200 are arranged at th e axial ends 107, 108, 109 around the first core 101. Aroun d the second core 121 eddy losses reducers 200 are arrang ed at the axialends126,127,128 and 129. For example, no eddy losses reducers 200 are arrang ed at the winding 104 and the winding 124.Thus,the winding 104 around the first core 101 has no associated eddy losses re ducer 200. Thus, the winding 124 around the second core 121 ha s no associated eddylossesreducer200.
  • Eddy losses reducers 200 are arranged at the windin gs 102, 103 that are arranged radially between the first co re 101 and the winding 104. Eddy losses reducers 200 are arranged at the windin gs 122, 123 that are arranged radially between the second c ore 121 and the winding 124.
  • the number of eddy losses reducers 200 is purely ex emplary and maydeviate from the numbershown in Figure 1. For example, less than the shown eddy losses reducers 2 00 may be provided or more. For example, just one single eddy losses reducer200 isprovided around each core 101,121.
  • Respective eddy losses reducers 200 can be arranged at each opposite end or only at one end and the other end i s free of an eddy losses reducer.
  • the number of eddy losses r educers 200 around core 101 can be different from the numbe r of eddy lossesreducers200 around the second core 121.It is possible that the transformer 100 comprises more th an two cores 101, 121, for example three cores with respec tive windingsormore.
  • the transformer100 comprises three cores with respective windings and 12 eddy lo sses reducers 200, four eddy losses reducers 200 per cor e, two windings with two eddy losses reducers 200 each per core.
  • the eddy losses reducer 200 c omprises a ring-like shape 203.
  • the eddy losses reducer 200 co mprises a center 213.
  • the center 213 of the shap e 203 of the eddy losses reducer 200 lies on the winding axi s 105 or the winding axis125 respectively.
  • the eddylosses reducer 200 extendsin the ring-like shape orring segment shape 203 around the respective core 101, 121.
  • t he eddy P2023,1496 WO N /P230155WO01 November28,2024 -11 - losses reducer comprises a radius around the center 213 with a value between 30 cm and 3 meters, depending on th e transformertype ofthe transformer100.
  • the eddy losses reducer 200 for example is not form ed as a closed ring but with the ring segment shape 203.
  • Th e eddy losses reducer 200 comprises an opening 204. At the opening 204 two ends 205, 206 of the eddy losses reducer 20 0 are arranged facing each other and opposite each other. the two ends 205, 206 are arranged at a distance 207.
  • the distance 207 comprises values from 0.5 mm to 25 cm. Other ranges and values for the distance 207 are possible .
  • Figure 3 shows a cross-section of the eddy losses r educer 200 along the line A of Figure 2.
  • the eddy losses reduc er 200 comprises a main body 201.
  • the main body 201 compri ses the ring segment shape 203.
  • the main body 201 comprises or consists of a non-ferromagnetic material.
  • the main body is made out of wood and/or plastic.
  • the main body 201 is made out of laminated wood and /or transformerboard.
  • the main body201 isconfigured asa stable bodywhich supportsthe eddylossesreducer 200.
  • a firstlayer202 surroundsthe main body201.
  • the first layer202 comprisesorconsistsofa ferromagnetic material.
  • the first layer 202 comprises or con sists of a metal, for example a metal strip 209 ( Figure 4).
  • the first layer 202 comprises iron or consists of i ron.
  • the first layer 202 is an iron sheet and c an just be made of ferromagnetic material.
  • the fi rst layer 202 comprises electrical steel like the one used to produce transformercoresand including amorphousones.
  • An optional further layer 212 surrounds the first l ayer 202.
  • the further layer 212 comprises or consists of a ca rbon layer and/or a further metallic layer.
  • the further layer 212 comprises an electrically conductive mate rial.
  • a covering layer 211 surrounds the further layer 21 2 and the first layer 202.
  • the covering layer co mprises or consists of paper, textile or plastic.
  • the furtherlayer212 coversthe covering layer211 at a surface which faces the first layer 202.
  • the c overing layer211 comprisescarbonized papersuch thatthe further layer212 isa carbon layeron the paper.
  • Figure 4 shows an example of the eddy losses reduce r 200 in which the ferromagnetic layer 202 is made out of th e metal strip 209.
  • the metalstrip 209 iswound around the main body 201,such thatthe metalstrip 209 coversthe main body201.
  • a plurality of metal strips 209 is wou nd around the main body 201 to achieve a desired thickness 20 8 ( Figure 3) of the ferromagnetic layer 202.
  • the metal strip 209 is wound around the m ain body 201 severaltimesto achieve the desired thickness 208.
  • the thickness 208 comprises a value betwee n 50 ⁇ m and 9 cm,forexample between 1 mm and 10 mm.
  • the metal strip 209 comprises a thickn ess between 0.01 mm and 0.6 mm .
  • the thickn ess of the metal strip comprises a value between 10 and 15 ⁇ m.
  • the metal strip 209 is a rolled iron sheet .
  • the metal strip 209 is fix ed by an adhesive connection 210. P2023,1496 WO N /P230155WO01 November28,2024 -13 -
  • the adhesive connecti on 210 is omitted.
  • the adhesive connection 210 can glue the metal stri p layer 209 to itself and/or to the main body 201. An adhes ive fixes the metal strip layer 209.
  • the eddy losses reducer 200 also serves as an equipotential ring to reduce electrica l stress at the axial ends 106 to 109, 126 to 129 of the res pective windings 102, 103, 104, 122, 123, 124.
  • no add itional element in addition to an equipotential ring is nec essary to achieve the reduction of the eddy radial losses wit h the eddy losses reducer 200.
  • the eddy losses reducer 200 act s as the equipotential ring and as a magnetic shunt.
  • Transfo rmer eddy losses can be easilyreduced.Byreducing the eddy losses, the efficiencyofthe transformer100 isimproved. Due to the reduced eddy losses, material savings can be achiev ed.
  • the iron used for the metal strip 209 for example c omprises an amorphous iron.
  • the iron used for t he metal strip 209 is of the same type of iron as used for t he core 101,102.
  • the eddylossesreducer200 issimple to implement and achieves lower losses and/or lower forces in the tr ansformer.
  • the material requirements for the eddy losses reduc er 200 are reduced compared to other solutions. Efficiency and reliability of the transformer 100 can be increased without P2023,1496 WO N /P230155WO01 November28,2024 -14 - any need for a substantive design change of the tra nsformer 100.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

Un transformateur comprend : - un noyau (101), - un enroulement (102, 103) enroulé autour d'un axe d'enroulement (105) s'étendant le long du noyau (101) ; - un réducteur de pertes par courants de Foucault (200), le réducteur de pertes par courants de Foucault (100) présentant une forme de segment annulaire, étant disposé à une extrémité axiale (106) de l'enroulement (102, 103) et comprenant un corps principal (201) non ferromagnétique et une couche ferromagnétique (202) entourant le corps principal (201).
PCT/EP2024/083924 2024-01-26 2024-11-28 Transformateur Pending WO2025157453A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP24154154.9A EP4593045A1 (fr) 2024-01-26 2024-01-26 Transformateur
EP24154154.9 2024-01-26

Publications (1)

Publication Number Publication Date
WO2025157453A1 true WO2025157453A1 (fr) 2025-07-31

Family

ID=89767684

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/083924 Pending WO2025157453A1 (fr) 2024-01-26 2024-11-28 Transformateur

Country Status (2)

Country Link
EP (1) EP4593045A1 (fr)
WO (1) WO2025157453A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110316662A1 (en) 2009-03-09 2011-12-29 Siemens Transformers Austria Gmbh & Co. Kg Winding arrangement for a transformer or for a throttle
WO2017134040A1 (fr) 2016-02-02 2017-08-10 Siemens Aktiengesellschaft Collier de blindage pour bobine de transformateur
US20180358160A1 (en) 2017-06-08 2018-12-13 Hitachi, Ltd. Stationary Induction Apparatus
US10658106B2 (en) 2016-09-02 2020-05-19 Hitachi, Ltd. Stationary induction electrical apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110316662A1 (en) 2009-03-09 2011-12-29 Siemens Transformers Austria Gmbh & Co. Kg Winding arrangement for a transformer or for a throttle
WO2017134040A1 (fr) 2016-02-02 2017-08-10 Siemens Aktiengesellschaft Collier de blindage pour bobine de transformateur
US10658106B2 (en) 2016-09-02 2020-05-19 Hitachi, Ltd. Stationary induction electrical apparatus
US20180358160A1 (en) 2017-06-08 2018-12-13 Hitachi, Ltd. Stationary Induction Apparatus

Also Published As

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EP4593045A1 (fr) 2025-07-30

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