EP2251875A1 - Noyau de transformateur - Google Patents

Noyau de transformateur Download PDF

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Publication number
EP2251875A1
EP2251875A1 EP09006635A EP09006635A EP2251875A1 EP 2251875 A1 EP2251875 A1 EP 2251875A1 EP 09006635 A EP09006635 A EP 09006635A EP 09006635 A EP09006635 A EP 09006635A EP 2251875 A1 EP2251875 A1 EP 2251875A1
Authority
EP
European Patent Office
Prior art keywords
transformer core
transformer
disks
leg
plan
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.)
Withdrawn
Application number
EP09006635A
Other languages
German (de)
English (en)
Inventor
Michael Luckey
Wolfgang Mönig
Benjamin Weber
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.)
ABB Technology AG
Original Assignee
ABB Technology 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
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to EP09006635A priority Critical patent/EP2251875A1/fr
Priority to CN2010800222740A priority patent/CN102428525A/zh
Priority to BRPI1010596A priority patent/BRPI1010596A2/pt
Priority to PCT/EP2010/002592 priority patent/WO2010133286A2/fr
Priority to KR1020117026963A priority patent/KR20120014147A/ko
Publication of EP2251875A1 publication Critical patent/EP2251875A1/fr
Priority to US13/296,679 priority patent/US20120075047A1/en
Withdrawn legal-status Critical Current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
    • 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 ohms Losses are superimposed by no-load losses and possibly short circuit losses as well as 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.
  • a transformer core of the type mentioned in the introduction This is characterized in that it has at least two transformer core disks arranged parallel to one another and at least approximately congruently adjacent to one another with an at least similar plan, that in the floor plan at least one through hole is provided, that the transformer core plates at least predominantly consist of an amorphous ferromagnetic 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 later to be arranged transformer windings.
  • 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.
  • 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 of the plate then depends on each gravitational down and can then under the greatest possible avoidance of mechanical stress be joined 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 here includes two rectangular through-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 hang Sheets, which previously formed the lower yoke, each 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 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, each having at least three primary and three secondary windings.
  • Fig. 1 shows an exemplary first transformer core 10 in a three-dimensional view, wherein the alignment of the three-dimensional coordinates by the coordinate system 42 is indicated.
  • the transformer core 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. It should be noted in the presentation that due to a Minimum bending radius of the sheets, the edges of the floor 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 plate 52 with spacers in a plan view 50.
  • the plan view of the second transformer core plate 52 is also rectangular in this figure, rectangular and has two also rectangular passage 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.
  • Cooling channels Arranged on the second transformer core disk 52, rectangular spacer elements are indicated, which are drawn as rectangles filled in black. Cooling channels, whose height corresponds to the preferably uniform height of the spacer elements, result between these spacer elements.
  • the corresponding transformer core is arranged upright, so that with natural cooling, a flow through the cooling channels, one of which is exemplified by the reference numeral 64, with air from bottom to top, as indicated by the arrows.
  • Fig. 3 shows an exemplary transformer core 70 in a side view, this from the already in Fig. 2 shown second transformer core plate 52 with the associated spacer elements and a structurally identical third transformer core plate 72 is formed. Visible in this sectional view and provided with a reference number are the cooling channels 88, 90, 92, 94, 96 and the already in Fig. 2 characterized first cooling channel 64, which are formed between the spacer elements 80, 82, 84, 86 and the other unmarked spacer elements. Also visible are the opening points 76 and 78 of the two transformer core disks, to which the peripheral outer plates are joined together.
  • 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 1 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 useful in particular 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)
EP09006635A 2009-05-16 2009-05-16 Noyau de transformateur Withdrawn EP2251875A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP09006635A EP2251875A1 (fr) 2009-05-16 2009-05-16 Noyau de transformateur
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
PCT/EP2010/002592 WO2010133286A2 (fr) 2009-05-16 2010-04-28 Noyau de transformateur
KR1020117026963A KR20120014147A (ko) 2009-05-16 2010-04-28 변압기 코어
US13/296,679 US20120075047A1 (en) 2009-05-16 2011-11-15 Transformer core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09006635A EP2251875A1 (fr) 2009-05-16 2009-05-16 Noyau de transformateur

Publications (1)

Publication Number Publication Date
EP2251875A1 true EP2251875A1 (fr) 2010-11-17

Family

ID=41137011

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09006635A Withdrawn EP2251875A1 (fr) 2009-05-16 2009-05-16 Noyau de transformateur

Country Status (6)

Country Link
US (1) US20120075047A1 (fr)
EP (1) EP2251875A1 (fr)
KR (1) KR20120014147A (fr)
CN (1) CN102428525A (fr)
BR (1) BRPI1010596A2 (fr)
WO (1) WO2010133286A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120139682A1 (en) * 2010-12-07 2012-06-07 Abb Technology Ag Amorphous transformer core

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2685477A1 (fr) * 2012-07-13 2014-01-15 ABB Technology Ltd Noyaux de transformateur hybride
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
US10373755B2 (en) * 2015-11-30 2019-08-06 Eagle Harbor Technologies, Inc. High voltage transformer
WO2018215064A1 (fr) * 2017-05-24 2018-11-29 Vacon Oy Inducteur et son procédé de production

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US4893400A (en) 1987-08-21 1990-01-16 Westinghouse Electric Corp. Method of making a repairable transformer having amorphous metal core
US5083360A (en) * 1988-09-28 1992-01-28 Abb Power T&D Company, Inc. Method of making a repairable amorphous metal transformer joint

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Publication number Priority date Publication date Assignee Title
US4893400A (en) 1987-08-21 1990-01-16 Westinghouse Electric Corp. Method of making a repairable transformer having amorphous metal core
US5083360A (en) * 1988-09-28 1992-01-28 Abb Power T&D Company, Inc. Method of making a repairable amorphous metal transformer joint

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120139682A1 (en) * 2010-12-07 2012-06-07 Abb Technology Ag Amorphous transformer core
EP2463871A1 (fr) * 2010-12-07 2012-06-13 ABB Technology AG Noyau de transformateur amorphe
CN102543372A (zh) * 2010-12-07 2012-07-04 Abb技术有限公司 非晶体变压器芯
US9041501B2 (en) * 2010-12-07 2015-05-26 Abb Technology Ag Amorphous transformer core

Also Published As

Publication number Publication date
KR20120014147A (ko) 2012-02-16
US20120075047A1 (en) 2012-03-29
BRPI1010596A2 (pt) 2016-03-15
WO2010133286A3 (fr) 2011-02-24
WO2010133286A2 (fr) 2010-11-25
CN102428525A (zh) 2012-04-25

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