WO2010133286A2 - Transformatorkern - Google Patents
Transformatorkern Download PDFInfo
- Publication number
- WO2010133286A2 WO2010133286A2 PCT/EP2010/002592 EP2010002592W WO2010133286A2 WO 2010133286 A2 WO2010133286 A2 WO 2010133286A2 EP 2010002592 W EP2010002592 W EP 2010002592W WO 2010133286 A2 WO2010133286 A2 WO 2010133286A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transformer core
- transformer
- cooling channel
- winding
- core according
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
-
- 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
- H01F27/24—Magnetic cores
- H01F27/25—Magnetic cores made from strips or ribbons
-
- 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
- H01F27/08—Cooling; Ventilating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
-
- 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
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
Definitions
- the invention relates to a transformer core for a power transformer and a power transformer with such a transformer core.
- transformers are used to power transfer the power supply by voltage adjustment from a first voltage level to a second one.
- power transformers in dry construction so-called dry-type transformers, are increasingly being used.
- the structure of a power transformer in dry construction is very similar to that of the power transformer with oil filling, as well as power transformer in dry construction, the respective winding body are applied to cores made of ferromagnetic material, which are connected at both ends with yokes and form a magnetic circuit.
- Ohmic losses occur in the windings of a loaded transformer due to the winding currents and eddy currents in the conductor material. These ohmic losses are superimposed by no-load losses and possibly short-circuit losses and hysteresis losses.
- the no-load losses are mainly determined by the induction and nature of the core and are approximately independent of the operating temperature of the transformer.
- the short-circuit losses are temperature-dependent and increase at constant load with the temperature or the resistivity of the conductor material.
- core materials with a very narrow hysteresis loop are used.
- amorphous core material is used in place of grain-oriented core material in recent times.
- amorphous materials require new constructions and processing because, on the one hand, because of the lower flux density compared to a conventional transformer core, larger core cross-sections are required and, on the other hand, an amorphous core material is more sensitive to higher temperatures than a grain-oriented core sheet.
- amorphous material which is usually available as a flat strip material, is mechanically very sensitive, which is why the available widths of the strip material are limited, for example to 200 mm.
- the mechanically realizable sizes of a transformer core are thus limited.
- the achievable ratings of amorphous core transformers have therefore been limited since then, for example, to 1 MVA, while conventional core dry type transformers have power ratings up to and over 20MVA.
- an object of the invention to provide a transformer core of amorphous material, which increases the achievable since then nominal power of a power transformer with amorphous core.
- the object of the invention is also to provide a corresponding power transformer.
- transformer core of the type mentioned in the introduction. This is characterized by the fact that it has at least two mutually parallel and at least approximately congruent mutually adjacent transformer core disks with an at least similar plan view, that at least one passage opening is provided in the plan view in each case Transformer core disks at least predominantly of an amorphous ferromagnetic consist of magnetic material and that at least one cooling channel is disposed between the transformer core.
- the at least one passage opening serves as a winding window for one or more transformer windings to be arranged later.
- a transformer core disk preferably extends perpendicular to its ground plan into a certain height. The height is limited by the mechanically achievable size and is for example 15cm to 25cm or even higher. If transformer core sizes are too large, even the dead weight of the core could lead to a risk of breakage due to the mechanical sensitivity of the amorphous ferromagnetic core material. In addition, the problem of core heating during operation of the power transformer becomes more critical with increasing height or thickness of the transformer core disk.
- Similar floor plans do not necessarily mean an identity of the floor plans. Rather, it is also conceivable, for example, in the arrangement of three transformer core plates, to provide the two outer discs with a slightly larger passage opening and a slightly smaller outer floor plan than the middle disc.
- each core disk is to be manufactured separately and, after production, forms a mechanically at least stabilized unit, which as such can also be transported and combined with other components to form a larger transformer core.
- An arrangement of a plurality of such transformer core disks with cooling channels therebetween increases the cooling surface for the transformer core assembled in this way, so that excessive heating of the temperature-sensitive core material can also be counteracted.
- transformer core disks and cooling channels therebetween thus advantageously allows the construction and Operation of a significantly increased in its size transformer core of amorphous ferromagnetic material.
- a plurality of cooling channels extend along the entire floor plan.
- the available cooling surface is exploited here in high degree and thus allows a correspondingly high cooling effect. It is both natural cooling, so for example, a flow through the cooling channels with ambient air, which passes through lower inlet openings in the cooling channels and in the heated state escapes again at the upper outlet openings, as well as forced cooling possible.
- the amorphous ferromagnetic material is band-shaped and arranged in several adjacent layers transversely to the plan around the at least one passage opening, so that a thickness of a transformer core results from a width of the band-shaped material.
- Ribbon-shaped amorphous core material is well transportable on rolls despite its mechanical sensitivity and also allows a flexible manufacturing process of a transformer core or a transformer core.
- the band material is applied in ring-like layers around the at least one passage opening.
- One layer comprises an angle of, for example, 360 °, with which a metal sheet encloses exactly the at least one through opening.
- An adjacent layer is then formed by another sheet.
- 360 ° are particularly advantageous in that, in the case of a hanging assembly of a transformer core or a transformer core disk, the mechanically sensitive metal sheet, which has a thickness of 15-50 ⁇ m, for example, can be hung over the upper edge of the core to be manufactured or via a holding device. On the sides, the sheet is then dependent on gravity down and can then be combined with the greatest possible avoidance of mechanical stress at the lower edge of the transformer core to be manufactured at its two ends.
- a metal sheet in the respective outer layers preferably encloses all passage openings so as to ensure increased mechanical stability of the manufactured transformer core.
- the plan view of the at least two transformer core disks is approximately rectangular in each case and the respective at least one through opening likewise forms so that at least two transformer core legs and at least two transformer core yokes are formed.
- the term rectangular is to be interpreted such that in each case the material-related bending radii of the strip material are taken into account, for example 100mm - 300mm and over, so that in general no sharp edges are formed.
- This shape corresponds approximately to the shape of a conventional transformer core and allows a simplified arrangement of windings on the transformer legs thus formed.
- a preferred form includes two rectangular passage openings or winding windows, so that three legs are formed, which allow the use of the transformer core for a three-phase power transformer.
- At least two transformer core disks can be opened and closed in layers on at least one leg and / or yoke, so that in the opened state, a cylindrical hollow body can be pushed over at least one leg, which is then penetrated by the leg.
- Such a possibility of layer-wise opening consists, for example, in that the transformer core is arranged hanging vertically and the sheets forming the transformer core or the transformer core disks are in each case joined together in the part then located at the bottom. After opening, the respective sheets, which previously formed the lower yoke, each hang as an extension of the respective transformer leg down and it is from below a cylindrical hollow body, in particular a winding, pushed.
- the at least one cooling channel is at least partially formed by spacer elements which space the transformer core disks. This type of cooling channel avoids additional thermal resistance between the cooling medium, such as air, and the adjacent transformer core disks,
- the at least one cooling channel is at least partially formed from at least one hollow element. This is advantageous if, for example, a liquid is used as the cooling medium. In this case, the core surface is protected from direct contact with the cooling medium and a closed coolant circuit can be formed.
- the at least one cooling channel consists at least predominantly of an electrically insulating material, for example a resin-impregnated hard fiber material.
- a common supply line connection and / or a common discharge connection is provided for a cooling medium flowing through the at least one cooling channel, which proves to be advantageous in particular in forced cooling with a liquid cooling medium.
- the transformer core is also arranged in a hanging manner with a vertically oriented ground plan during operation. The mechanical loads on the transformer core are thereby further reduced.
- At least one electrical winding arranged about a winding axis is arranged on a limb of the transformer core, wherein the winding is penetrated by the limb along its winding axis.
- a power transformer with a transformer core of the type described above.
- This is a three-phase transformer with at least three primary and three secondary windings.
- FIG. 1 shows an exemplary first transformer core disk in a three-dimensional view
- FIG. 2 shows an exemplary second transformer core disk with spacer elements in a plan view
- Fig. 3 shows an exemplary transformer core in a side view
- FIG. 4 shows a transformer core leg with electrical winding in a sectional view.
- FIG. 1 shows an exemplary first transformer core disk 10 in a three-dimensional view, the orientation of the three-dimensional coordinates being indicated by the coordinate system 42.
- the transformer core disk 10 has a rectangular plan in the z-direction 44 and two rectangular passage openings 12, 14 perpendicular to the plan in the y-direction, which serve as a winding window.
- the transformer core disk 10 is formed from a plurality of layers 16, 18, 20, 22, 24 of a band-shaped amorphous ferromagnetic material, the actual number of layers being unequally higher than the five layers indicated here, for example due to their small thickness of approximately 15-50 ⁇ m several thousand.
- the edges of the plan are not formed as angular, as indicated in the figure, but for example with a radius of 100mm - 300mm.
- Each layer is formed in this example exactly by a circumferential sheet having a width designated by the reference numeral 36, the two ends are joined together in the representation in the lower yoke region of the transformer core.
- the transformer core is required to open again, for example, to push in a further production step, a winding from below over the then accessible transformer core plate legs ,
- the respectively indicated three inner layers of strip material 16, 18, 20 each enclose one of the two passage openings or winding windows 12, 14.
- the two indicated outer layers 22, 24 enclose both passage openings 12, 14 with the respective inner layers 16, 18, 20. This is particularly useful for reasons of mechanical stability of the transformer core 10, which is shown hanging on the two hangers 38, 40.
- the hanging arrangement is particularly advantageous during production but also during later operation, because the mechanical load for the transformer core or the transformer core disk 10 is thus reduced.
- FIG. 2 shows an exemplary second transformer core disk 52 with spacer elements in a plan view 50.
- the plan view of the second transformer core disk 52 is also rectangular in this figure and has two likewise rectangular through openings 54, 56 which serve as a winding window.
- three transformer core legs 58, 60, 62 are pronounced, which are connected at their two ends in each case via a yoke 66, 68.
- FIG. 3 shows an exemplary transformer core 70 in a side view, wherein the latter is formed from the second transformer core disk 52 already shown in FIG. 2 with the associated spacer elements and a structurally identical third transformer core disk 72.
- Such an assembly of the transformer core or the transformer core plate forming sheets is possible for example by a layer-wise gearing and wrapping the legs or yokes formed with a suitable band-shaped fastening material.
- FIG. 4 shows a transformer core leg with electrical winding in a sectional view 100.
- the transformer core leg is formed by the three transformer core disk shanks 102, 104, 106 and the hollow elements 108 and 110 arranged therebetween whose inner region forms the cooling channels 112 and 114.
- Such hollow elements are particularly useful when using a different cooling medium than the ambient air, because in such a case, preferably, a closed circuit of the cooling medium is to be formed.
- the width and height of the leg cross sections of the transformer core disks are selected such that an ellipse-like cross section of the transformer core leg results, which corresponds to the high-cylindrical inner cross section of the winding 116.
- the cooling effect is homogenized over the entire leg cross-section, because the outer transformer core disks 102, 106 adjoining only one cooling channel 112, 114 are thinner than the central transformer core disk 104 surrounded by cooling channels 112, 114 on both sides.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coils Of Transformers For General Uses (AREA)
- Transformer Cooling (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010800222740A CN102428525A (zh) | 2009-05-16 | 2010-04-28 | 变压器铁芯 |
BRPI1010596A BRPI1010596A2 (pt) | 2009-05-16 | 2010-04-28 | núcleo de transformador |
US13/296,679 US20120075047A1 (en) | 2009-05-16 | 2011-11-15 | Transformer core |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09006635.8 | 2009-05-16 | ||
EP09006635A EP2251875A1 (de) | 2009-05-16 | 2009-05-16 | Transformatorkern |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/296,679 Continuation US20120075047A1 (en) | 2009-05-16 | 2011-11-15 | Transformer core |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010133286A2 true WO2010133286A2 (de) | 2010-11-25 |
WO2010133286A3 WO2010133286A3 (de) | 2011-02-24 |
Family
ID=41137011
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/002592 WO2010133286A2 (de) | 2009-05-16 | 2010-04-28 | Transformatorkern |
Country Status (6)
Country | Link |
---|---|
US (1) | US20120075047A1 (de) |
EP (1) | EP2251875A1 (de) |
KR (1) | KR20120014147A (de) |
CN (1) | CN102428525A (de) |
BR (1) | BRPI1010596A2 (de) |
WO (1) | WO2010133286A2 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2463871B1 (de) * | 2010-12-07 | 2017-06-14 | ABB Schweiz AG | Amorpher Transformatorkern |
EP2685477A1 (de) * | 2012-07-13 | 2014-01-15 | ABB Technology Ltd | Hybride Transformatorkerne |
US9524820B2 (en) * | 2012-11-13 | 2016-12-20 | Raytheon Company | Apparatus and method for thermal management of magnetic devices |
US9355774B2 (en) * | 2012-12-28 | 2016-05-31 | General Electric Company | System and method for manufacturing magnetic resonance imaging coils using ultrasonic consolidation |
US9177708B2 (en) * | 2013-06-14 | 2015-11-03 | Varian Semiconductor Equipment Associates, Inc. | Annular cooling fluid passage for magnets |
CN105097209B (zh) * | 2014-04-25 | 2018-06-26 | 台达电子企业管理(上海)有限公司 | 磁性元件 |
US9911532B2 (en) | 2014-08-25 | 2018-03-06 | Raytheon Company | Forced convection liquid cooling of fluid-filled high density pulsed power capacitor with native fluid |
CN115410804A (zh) * | 2015-11-30 | 2022-11-29 | 鹰港科技有限公司 | 高压变压器 |
CN110352467B (zh) * | 2017-05-24 | 2021-07-30 | 伟肯有限公司 | 电感器以及用于制造电感器的方法 |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2912658A (en) * | 1952-12-26 | 1959-11-10 | Gen Electric | Turburlence promoters for fluid cooled electrical apparatus |
US2946028A (en) * | 1954-04-12 | 1960-07-19 | Mc Graw Edison Co | Polyphase transformer |
US3183461A (en) * | 1962-02-05 | 1965-05-11 | Westinghouse Electric Corp | Magnetic core structure with cooling passages therein |
US3264589A (en) * | 1963-09-03 | 1966-08-02 | Gen Electric | Transformer pockets for vaporized cooling |
GB1094069A (en) * | 1964-12-17 | 1967-12-06 | Ass Elect Ind | Improvements in laminated magnetic cores |
US4345229A (en) * | 1978-12-06 | 1982-08-17 | General Electric Company | Amorphous metal ballasts and reactors |
JPS57103308A (en) * | 1980-12-18 | 1982-06-26 | Mitsubishi Electric Corp | Iron core for induction equipment |
US4893400A (en) | 1987-08-21 | 1990-01-16 | Westinghouse Electric Corp. | Method of making a repairable transformer having amorphous metal core |
JP2698369B2 (ja) * | 1988-03-23 | 1998-01-19 | 日立金属株式会社 | 低周波トランス用合金並びにこれを用いた低周波トランス |
US5083360A (en) * | 1988-09-28 | 1992-01-28 | Abb Power T&D Company, Inc. | Method of making a repairable amorphous metal transformer joint |
US5331304A (en) * | 1992-09-11 | 1994-07-19 | Cooper Power Systems, Inc. | Amorphous metal transformer core |
TW371768B (en) * | 1997-06-06 | 1999-10-11 | Hitachi Ltd | Amorphous transformer |
EP0977214B1 (de) * | 1998-07-31 | 2004-11-24 | Hitachi, Ltd. | Transformatorkern aus amorphem Metall |
US6683524B1 (en) * | 1998-09-02 | 2004-01-27 | Hoeglund Lennart | Transformer core |
SE0000410D0 (sv) * | 2000-02-06 | 2000-02-06 | Lennart Hoeglund | Trefas transformatorkärna |
TW578171B (en) * | 2001-04-13 | 2004-03-01 | Mitsui Chemicals Inc | Magnetic core and adhesive resin composition for magnetic core |
US6668444B2 (en) * | 2001-04-25 | 2003-12-30 | Metglas, Inc. | Method for manufacturing a wound, multi-cored amorphous metal transformer core |
US6765467B2 (en) * | 2001-04-25 | 2004-07-20 | Dung A. Ngo | Core support assembly for large wound transformer cores |
WO2003094323A1 (en) * | 2002-05-06 | 2003-11-13 | Aerovironment, Inc. | Lamination cooling system |
US7260883B2 (en) * | 2003-06-19 | 2007-08-28 | Abb Technology Ag | Method for forming a winding for a three-phase transformer |
-
2009
- 2009-05-16 EP EP09006635A patent/EP2251875A1/de not_active Withdrawn
-
2010
- 2010-04-28 WO PCT/EP2010/002592 patent/WO2010133286A2/de active Application Filing
- 2010-04-28 KR KR1020117026963A patent/KR20120014147A/ko not_active Application Discontinuation
- 2010-04-28 BR BRPI1010596A patent/BRPI1010596A2/pt not_active IP Right Cessation
- 2010-04-28 CN CN2010800222740A patent/CN102428525A/zh active Pending
-
2011
- 2011-11-15 US US13/296,679 patent/US20120075047A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
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None |
Also Published As
Publication number | Publication date |
---|---|
CN102428525A (zh) | 2012-04-25 |
EP2251875A1 (de) | 2010-11-17 |
BRPI1010596A2 (pt) | 2016-03-15 |
WO2010133286A3 (de) | 2011-02-24 |
KR20120014147A (ko) | 2012-02-16 |
US20120075047A1 (en) | 2012-03-29 |
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