EP1849169B1 - Noyau de transformateur a blindage magnetique - Google Patents

Noyau de transformateur a blindage magnetique Download PDF

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Publication number
EP1849169B1
EP1849169B1 EP06708170.3A EP06708170A EP1849169B1 EP 1849169 B1 EP1849169 B1 EP 1849169B1 EP 06708170 A EP06708170 A EP 06708170A EP 1849169 B1 EP1849169 B1 EP 1849169B1
Authority
EP
European Patent Office
Prior art keywords
core
screen
transformer
transformer core
shield
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
EP06708170.3A
Other languages
German (de)
English (en)
Other versions
EP1849169A1 (fr
Inventor
Christoph PLÖTNER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1849169A1 publication Critical patent/EP1849169A1/fr
Application granted granted Critical
Publication of EP1849169B1 publication Critical patent/EP1849169B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01F27/34—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
    • 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
    • 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
    • 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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/02—Cores, Yokes, or armatures made from sheets

Definitions

  • the invention relates to a transformer core with a core interior of magnetizable material.
  • a tensioning device is arranged around the outside of the core, which holds the layered core and the coil body arranged around the core under axial pressure.
  • Transformer core is any magnetizable core for the intended use in an electromagnetic machine, such. a transformer or a choke.
  • the core inside in the sense of the present invention is the magnetizable part of the transformer core for guiding the magnetic flux.
  • Magnetic leakage fluxes generate eddy currents in the outer core segments and / or in the clamping device, which can lead to considerable local heating of the core or the clamping device.
  • this problem has been addressed by dividing the outer core regions into small-width segments and reducing power losses and localized heating by using narrow or slotted clamping devices.
  • the disadvantage here that while the power losses can be reduced, on the other hand, a local warming, especially with high power transformers, is not prevented.
  • the transformer has a three-legged laminated core with wound around the middle leg transformer windings, wherein the magnetic shield consists of a copper shorting strip, which is guided transversely to the leg longitudinal direction around the laminated core and the windings.
  • the DE 39 40 025 A1 discloses a shield winding for magnetizable material transformers.
  • the shielding coil according to the invention is wound between two winding sections of a transformer, wherein a magnetizable material with a low permeability is used for the shielding winding.
  • a disadvantage of these windings known from the prior art is that, although external disturbing influences on the entire bobbin are prevented, however, non-magnetic stray fluxes within the bobbin, in particular on the core outside, are prevented.
  • CH 484 499 A discloses a transformer core according to the preamble of claim 1.
  • the object of the present invention is therefore to reduce or prevent the magnetic stray fluxes acting on the outside of the core interior and, if present, inside the tensioning device on the outside of the core interior.
  • a shield is at least partially disposed around the core interior, wherein the shield has a layered structure with at least one magnetizable material.
  • layered magnetizable materials such as electrical sheets, conducts the leakage flux into the sheets and causes little power loss in the laminated shield. Due to the guidance of the magnetic leakage fluxes, no eddy currents are generated in the outer side of the core, so that the power losses and local heating within these ranges are greatly reduced or completely avoided. The power losses within the shield and local heating are greatly reduced compared to a transformer core without shielding according to the invention.
  • a device for generating an axial pressure on the interior of the core is arranged between the core interior and the shield.
  • the use of a layered core interior requires the permanent maintenance of axial pressure on the layered core interior.
  • These devices which are usually also referred to as tensioning devices, are arranged directly on the core of the core. Because of the need for high strength, these devices for generating axial pressure often consist of electrically and magnetically conductive materials, such as steel or other metallic sheets. Within these clamping devices for generating an axial pressure locally high heating and power losses are caused by induced eddy currents in magnetic interference.
  • the tensioning device is constructed of layered metals which, like the outer regions of the core interior, are additionally subdivided into segments. This minimizes the maximum according to the prior art possible power of the transformer using the described transformer core.
  • the shield is divided into segments.
  • the subdivision of the shield into segments allows, on the one hand, a rapid and modular construction of the shield around the interior of the core or around the device for exerting the axial pressure.
  • the segmental structure of the shield also allows to create a shield adapted directly to the transformer. As a result, the risk of large local overheating of the device for generating the axial pressure and / or the outer core regions is prevented. In this way, transformers with larger stray fluxes can be built more reliably than before. Also, the power losses when using a transformer core according to the invention are substantially reduced.
  • the length of the shield in the axial direction is equal to or greater than the length of a coil former provided around the transformer core.
  • the shield can be arranged along the entire transformer leg and thus also reduce the negative magnetic stray influences on the final yoke and other optionally existing structural elements.
  • the orientation of the layered structure of the shield parallel to a possible Stray flux direction of a magnetic field is aligned.
  • the orientation may be aligned parallel with respect to the generated within the transformer or with respect to an external possible leakage flux direction.
  • the magnetic flux is ideally guided along the stratification and thus led away at the tensioning device or from the outer regions of the inner core.
  • a preferred feature of the invention is that the core interior is constructed of layered core segments and the shield is disposed along the outside of the outermost core segment or along the axial pressure generating device.
  • the shield is fixed together with the core inside with a - usually insulating bandage.
  • the magnetizable material of the shield is an electrical sheet as used in electromagnetic devices.
  • FIG. 1 shows a schematic sectional view of the transformer core 1 according to the invention along the axial orientation of the transformer core 1.
  • a clamping device 3 for generating an axial pressure on the inner core 2 and
  • a shield 4 is arranged, which is an intrusion of the leakage flux - caused by the electrical currents in the surrounding bobbins 5 - in the core 2 and in the clamping device 3.
  • the bandage 6 meets - with appropriate choice of material - as an insulating sheathing around the inner core 2 another function.
  • the longitudinal axis along the transformer core 1 is shown as a dashed line.
  • FIG. 2a and Fig. 2b each show a cross section of the transformer core according to the invention 1.
  • a core inner 2 enclosing clamping device 3 is clearly visible.
  • the tensioning device 3 can be constructed in the radial direction either continuously or segmented.
  • To the clamping device 3 according to the figures Fig. 2a and 2b closes the shield 4.
  • the shield 4 may have a layered structure along the entire surface to be shielded.
  • FIG. 2b a segmented structure of layered elements of the shield 4 in view of a modular structure of the transformer core 1 and its shielding be advantageous.
  • the shield 4 Via an outer bandage 6, the shield 4, which encloses either the transformer core 1 completely but at least along the orientation of the yoke, the shield 4 is fixed.
  • the fixation of the shield 4 to the inner core 2 may alternatively via fasteners to the inner core 2, with the clamping device 3 or with other fasteners (not shown). Also a fixation of the shield 4 by means of the material consolidation of the shield under tension or pressure around the inner core 2 and the clamping device 3 is possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Claims (6)

  1. Noyau (1) de transformateur ayant un intérieur (2) en matériau magnétisable, un blindage (4) étant disposé au moins en partie autour de l'intérieur (2) du noyau, le blindage (4) comportant une structure feuilletée ayant au moins un matériau magnétisable, un dispositif (3) de production d'une pression axiale sur l'intérieur du noyau étant disposé entre l'intérieur (2) du noyau et le blindage (4),
    caractérisé en ce que
    le blindage (4) est subdivisé en segments et la structure feuilletée du blindage (4) est dirigée parallèlement à une direction de flux de dispersion possible d'un champ magnétique extérieur.
  2. Noyau (1) de transformateur suivant la revendication, caractérisé en ce que
    la longueur du blindage (4) dans la direction axiale est supérieure ou égale à la longueur axiale des corps (5) de bobine prévus autour du noyau (1) de transformateur.
  3. Noyau (1) de transformateur suivant l'une des revendications 1 à 2,
    caractérisé en ce que
    l'intérieur (2) du noyau est constitué de segments de noyau stratifiés et le blindage (4) est disposé le long du côté extérieur du segment de noyau le plus à l'extérieur.
  4. Noyau (1) de transformateur suivant l'une des revendications 1 à 3,
    caractérisé en ce que
    le blindage (4) est immobilisé au moyen d'un bandage (6) autour du blindage (4).
  5. Noyau (1) de transformateur suivant l'une des revendications 1 à 4,
    caractérisé en ce que
    un matériau isolant entre le blindage (4) et le bandage (6) immobilise le blindage (4).
  6. Noyau (1) de transformateur suivant l'une des revendications 1 à 5,
    caractérisé en ce que
    le matériau magnétisable du blindage (4) est constitué par des tôles magnétiques.
EP06708170.3A 2005-02-16 2006-02-10 Noyau de transformateur a blindage magnetique Not-in-force EP1849169B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005008302A DE102005008302B4 (de) 2005-02-16 2005-02-16 Transformatorkern mit magnetischer Abschirmung
PCT/EP2006/050827 WO2006087294A1 (fr) 2005-02-16 2006-02-10 Noyau de transformateur a blindage magnetique

Publications (2)

Publication Number Publication Date
EP1849169A1 EP1849169A1 (fr) 2007-10-31
EP1849169B1 true EP1849169B1 (fr) 2016-06-15

Family

ID=36177826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06708170.3A Not-in-force EP1849169B1 (fr) 2005-02-16 2006-02-10 Noyau de transformateur a blindage magnetique

Country Status (10)

Country Link
EP (1) EP1849169B1 (fr)
KR (1) KR101003933B1 (fr)
CN (1) CN101120421A (fr)
BR (1) BRPI0607872A2 (fr)
CA (1) CA2597934C (fr)
DE (1) DE102005008302B4 (fr)
MX (1) MX2007009717A (fr)
RU (1) RU2412498C2 (fr)
UA (1) UA88942C2 (fr)
WO (1) WO2006087294A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE549725T1 (de) 2007-10-29 2012-03-15 Siemens Transformers Austria Gmbh & Co Kg Transformatorkern mit streufeldschirmung
EP2472534B1 (fr) * 2009-11-20 2020-10-07 Mitsubishi Electric Corporation Transformateur
CN101777416B (zh) * 2010-03-15 2011-12-14 贵阳新星变压器有限公司 壳式变压器矩形圆角铁芯
CN102163488A (zh) * 2010-11-25 2011-08-24 文泽生 非晶油浸式全磁屏蔽空芯电抗器
CN106571210B (zh) * 2015-10-09 2018-10-12 特变电工沈阳变压器集团有限公司 一种110kV变压器
JP6857494B2 (ja) * 2016-12-26 2021-04-14 株式会社日立産機システム 静止誘導電器
DE102020215178A1 (de) 2020-12-02 2022-06-02 BSH Hausgeräte GmbH Transformator für ein Schaltnetzteil
WO2022225498A1 (fr) 2021-04-19 2022-10-27 Леонид Адамович БИЛЫЙ Transformateur triphasé
CN117095915A (zh) * 2023-06-26 2023-11-21 西安西电变压器有限责任公司 铁心、铁心结构及变压器

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1277434B (de) * 1963-09-10 1968-09-12 Westinghouse Electric Corp Magnet- und Koronaschild fuer elektrische Induktionsgeraete
DE1237677B (de) * 1964-08-01 1967-03-30 Siemens Ag Magnetschildanordnung fuer geschichtete Eisenkerne von Transformatoren und Drosselspulen
US3464041A (en) * 1968-03-06 1969-08-26 Allis Chalmers Mfg Co Electrical transformer having leakage flux shield
CH484499A (de) * 1968-06-29 1970-01-15 Bbc Brown Boveri & Cie Induktionsgerät, insbesondere Transformator oder Drosselspule
US3962661A (en) * 1975-04-22 1976-06-08 International Telephone And Telegraph Corporation Magnetically shunted current transformer
NL7904379A (nl) * 1979-06-05 1980-12-09 Philips Nv Transformator.
JPS5793512A (en) * 1980-12-03 1982-06-10 Meidensha Electric Mfg Co Ltd Fixation of bound iron core and winding
DE3141972A1 (de) * 1981-10-22 1983-05-11 Transformatoren Union Ag, 7000 Stuttgart Eisenkern fuer elektrische drosseln
JPS61259512A (ja) * 1985-05-14 1986-11-17 Fuji Electric Co Ltd 放射状ブロツク鉄心
DE3627890A1 (de) * 1986-08-16 1988-02-25 Philips Patentverwaltung Transformator mit einer magnetischen abschirmung und verfahren zur herstellung einer solchen abschirmung
DE3940025A1 (de) * 1989-12-04 1991-06-06 Michael Riedel Transformatoren Abschirmwicklung fuer transformatoren aus magnetisierbarem material
EP0477413B1 (fr) * 1990-09-27 1995-08-09 Siemens Aktiengesellschaft Procédé pour réduire l'hystérésis et convertisseur électromécanique avec réduction d'hystérésis
DE10350262A1 (de) * 2002-12-16 2004-07-22 Siemens Ag Österreich Übertrager mit einem Kern und einem Spulenkörper

Also Published As

Publication number Publication date
KR20070103052A (ko) 2007-10-22
MX2007009717A (es) 2007-09-26
WO2006087294A1 (fr) 2006-08-24
EP1849169A1 (fr) 2007-10-31
DE102005008302A1 (de) 2006-08-24
CA2597934C (fr) 2015-04-14
RU2007134373A (ru) 2009-03-27
DE102005008302B4 (de) 2010-09-02
CN101120421A (zh) 2008-02-06
RU2412498C2 (ru) 2011-02-20
BRPI0607872A2 (pt) 2009-10-20
CA2597934A1 (fr) 2006-08-24
UA88942C2 (xx) 2009-12-10
KR101003933B1 (ko) 2010-12-30

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