EP0556939A1 - Noyau de transformateur ou de réactance, pour un transformateur ou une réactance de puissance - Google Patents

Noyau de transformateur ou de réactance, pour un transformateur ou une réactance de puissance Download PDF

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Publication number
EP0556939A1
EP0556939A1 EP93250018A EP93250018A EP0556939A1 EP 0556939 A1 EP0556939 A1 EP 0556939A1 EP 93250018 A EP93250018 A EP 93250018A EP 93250018 A EP93250018 A EP 93250018A EP 0556939 A1 EP0556939 A1 EP 0556939A1
Authority
EP
European Patent Office
Prior art keywords
transformer
laminations
sheets
core
layers
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Withdrawn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
EP93250018A
Other languages
German (de)
English (en)
Inventor
Josef Dipl.-Ing. Bohn
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 EP0556939A1 publication Critical patent/EP0556939A1/fr
Withdrawn legal-status Critical Current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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented

Definitions

  • the invention relates to a transformer or choke core according to the preamble of claim 1.
  • Such cores are known from WO 91/13450.
  • WO 91/13450 provides that after the windings have been applied to the legs of the core, the yoke plates are no longer individually placed on these legs or fitted into the ends of the leg plates, but instead that both the ends of the legs and those which are layered to form a yoke core Yoke sheets are assembled into sheet packs and are offset in stages so that they mesh with one another when they are joined together. The sheets are arranged differently from layer to layer within the individual laminated cores of the winding support.
  • the yoke and leg bundles of transformers and chokes are usually at least when it comes to large-volume transformers or chokes, i.e. power transformers or power chokes, longitudinally braced by externally acting tie rods and tensioning pads (EP-A1-0 309 690).
  • Such clamping devices are relatively inexpensive and allow the laminated cores to be braced with a precisely defined torque. Specifying such a torque is also important, among other things, in order to keep the inevitable noise development when operating such transformers and chokes low. Experiments determine the torque at which the noise level is the lowest and this torque is then specified for the assembly of all other transformers and chokes of the type in question.
  • the object of the invention is to provide a transformer or choke core according to the preamble of claim 1 for the construction of an extremely low-noise transformer or a low-noise choke, which can be easily manufactured and whose laminated cores can be clamped without it being adhered to specified torques arrives.
  • the invention solves this problem by the characterizing features of claim 1.
  • the use of multi-layer laminated cores in conjunction with the transverse tensioning of the laminated cores provided after the windings have been applied leads to transformers or chokes with extremely low noise during operation.
  • Tests on a certain type of transformer have shown that the noise development is the lowest when the core laminations consist of seven layers of laminated metal sheets; with increasing or decreasing number of layers, the noise of the transformer or choke increases again during operation.
  • the optimum of the core sheet division is differentiated be stored; for each transformer or choke size, the optimal design must therefore be determined by experiment.
  • the pressure plates should protrude beyond the depth of penetration of the interlocking sheets; this ensures that a sufficiently stable transverse tension of the interlocking laminated cores is possible, which largely precludes a relative movement of the laminations after the core has been assembled.
  • the pressure plates can advantageously also be designed as a support bracket for fastening the core; the design of the pressure plates as angles promotes the mechanical fixation of the interlocking laminated cores.
  • the tie rods are encased in an electrically insulating manner in the area of the laminated cores. According to claim 6, this insulation can advantageously be represented by an attached plastic hose.
  • the recesses for the tie rods to be provided in the metal sheets are arranged exclusively or predominantly in the metal sheets of the individual sheet metal layers projecting from the metal sheet packs. Experiments have shown that an optimal bracing of the laminated core is achieved in this way.
  • the drawing shows the structure of a three-legged transformer core in a spatial exploded view.
  • the three legs 1, 2, 3 of the core consist of seven layers of z. B. thirty stacked sheets, of which only the layers 1 to 17 forming the leg 1 are designated in the drawing.
  • the sheets within the individual layers are the same size. Their dimensions correspond to the dimensions of the sheets in the adjacent layers.
  • the adjacent layers are staggered in the longitudinal direction of the sheets, with tooth-shaped structures for the leg ends. These tooth-shaped structures serve to receive, align and fix corresponding tooth-shaped structures of the two yokes 4 and 5 of the magnate core.
  • Each of these yokes is formed from seven layers of sheet metal stacked on top of each other, each with different widths.
  • Each sheet layer contains z. B. 30 sheets.
  • the yoke 4 consists of four layers 41, 43, 45 and 47 narrow sheets and three layers 42, 44 and 46 wider sheets. When assembling the core, the wider sheets harmonize with the recesses between the sheet layers protruding upward from the leg ends.
  • the yoke 5 consists of three layers 52, 54 and 56 of narrow sheets and four layers 51, 53, 55 and 57 of wider sheets. With regard to this yoke, the layers protruding from the legs 1 harmonize with the recesses between the layers 42, 44 and 46 and 51, 53, 55 and 57 of the yokes 4 and 5.
  • one or more legs are provided with one or more windings. This is preferably done by wrapping the pre-assembled legs. It is advantageous to fix the individual sheet metal layers of the legs in a suitable manner against one another, for example by plugging a comb-like structure onto the end faces of the legs or by temporarily tightening the sheet metal layers using screws or the like, which are provided by corresponding recesses 18, 28, 38 of the sheet metal layers to grab.
  • the legs and with them the windings carried by them with their end-like comb-like structures are inserted into the corresponding receptacles of the yokes or the yokes are inserted into the corresponding receptacles of the legs.
  • the mutual fixing of legs and yokes is done by pressure plates 6 to 9 and six tie rods, not shown in the drawing, for transverse bracing of the core.
  • tie rods which can be designed, for example, as screws, penetrate corresponding recesses 61, 71 and 81, 91 of the pressure plates as well as corresponding perforations made in the sheet metal of the yokes and legs, of which in the Drawing only the recesses 18, 28 and 38 can be seen.
  • These recesses are arranged in such a way that they penetrate exclusively or predominantly the sheets of the individual sheet layers protruding from the sheet packs.
  • the pressure plates must be designed to be dimensionally stable. In order to be able to apply sufficient contact pressure, the width of the pressure plates is greater than the penetration depth of the interlocking sheets of the yokes and legs. To stiffen the pressure plates, they are designed as elbows. These angle pieces can advantageously be provided at the same time for fastening the fully assembled transformers or chokes on any supporting body.
  • the tie rods are to be encased in an electrically insulating manner in the area of the sheet metal packs. This can preferably be done by inserting the tie rods into appropriate plastic hoses.
  • the transformer or choke After the transformer or choke has been mounted, it can advantageously be impregnated with a hardening material.
  • a hardening material which can also be designed in particular as a vacuum impregnation process, the impregnation mass penetrates into even the smallest voids between adjacent elements of the core and, after hardening, prevents these elements from vibrating under the influence of the alternating currents flowing in the windings and can therefore cause noise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP93250018A 1992-02-21 1993-01-19 Noyau de transformateur ou de réactance, pour un transformateur ou une réactance de puissance Withdrawn EP0556939A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9202442U 1992-02-21
DE9202442U DE9202442U1 (de) 1992-02-21 1992-02-21 Transformator- oder Drosselkern für einen Leistungstransformator oder eine Leistungsdrossel

Publications (1)

Publication Number Publication Date
EP0556939A1 true EP0556939A1 (fr) 1993-08-25

Family

ID=6876527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93250018A Withdrawn EP0556939A1 (fr) 1992-02-21 1993-01-19 Noyau de transformateur ou de réactance, pour un transformateur ou une réactance de puissance

Country Status (2)

Country Link
EP (1) EP0556939A1 (fr)
DE (1) DE9202442U1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6713734B2 (en) * 2000-12-22 2004-03-30 Canon Kabushiki Kaisha Image heating apparatus for heating image formed on recording material
US6816054B2 (en) * 2003-03-10 2004-11-09 Kuo-Liang Lin Silicon steel core for transformers or choke coils
EP2452752A1 (fr) 2010-11-11 2012-05-16 Thermo Fisher Scientific Oy Pipette à poignée
WO2022104641A1 (fr) * 2020-11-18 2022-05-27 吴江变压器有限公司 Transformateur de distribution à haut rendement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6100783A (en) * 1999-02-16 2000-08-08 Square D Company Energy efficient hybrid core
DE102008032799A1 (de) * 2008-07-11 2010-01-14 Abb Technology Ag Transformator mit einem Kern

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE404582C (de) * 1922-06-23 1924-10-23 Bbc Brown Boveri & Cie Blechschnitt fuer Transformatoren mit in die Schenkelenden eingeschichteten Jochblechen
DE1008817B (de) * 1954-02-05 1957-05-23 Siemens Ag Rechteckiger, aus Blechlamellen geschichteter Magnetkern fuer elektrische Induktionsgeraete, insbesondere Transformatoren
DE1050438B (de) * 1959-02-12 Siemens Schuckertwerke Aktiengesellschaft Berlin und Erlangen Geschichteter Eisenkern fur elektrische Gerate insbesondere fur Transformatoren Drosseln u dgl
CH341896A (de) * 1955-12-30 1959-10-31 Oerlikon Maschf Geschachtelter Eisenkörper für Transformatoren
US3411121A (en) * 1967-06-27 1968-11-12 Gen Electric Insulated clamping means for laminated magnetic core
FR2131107A5 (fr) * 1971-03-30 1972-11-10 Alsthom Savoisienne
JPS57143807A (en) * 1981-03-02 1982-09-06 Daihen Corp Iron core for stationary electrical equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1050438B (de) * 1959-02-12 Siemens Schuckertwerke Aktiengesellschaft Berlin und Erlangen Geschichteter Eisenkern fur elektrische Gerate insbesondere fur Transformatoren Drosseln u dgl
DE404582C (de) * 1922-06-23 1924-10-23 Bbc Brown Boveri & Cie Blechschnitt fuer Transformatoren mit in die Schenkelenden eingeschichteten Jochblechen
DE1008817B (de) * 1954-02-05 1957-05-23 Siemens Ag Rechteckiger, aus Blechlamellen geschichteter Magnetkern fuer elektrische Induktionsgeraete, insbesondere Transformatoren
CH341896A (de) * 1955-12-30 1959-10-31 Oerlikon Maschf Geschachtelter Eisenkörper für Transformatoren
US3411121A (en) * 1967-06-27 1968-11-12 Gen Electric Insulated clamping means for laminated magnetic core
FR2131107A5 (fr) * 1971-03-30 1972-11-10 Alsthom Savoisienne
JPS57143807A (en) * 1981-03-02 1982-09-06 Daihen Corp Iron core for stationary electrical equipment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 243 (E-145)(1121) 2. Dezember 1982 & JP-A-57 143 807 ( OOSAKA HENATSUKI ) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6713734B2 (en) * 2000-12-22 2004-03-30 Canon Kabushiki Kaisha Image heating apparatus for heating image formed on recording material
US6816054B2 (en) * 2003-03-10 2004-11-09 Kuo-Liang Lin Silicon steel core for transformers or choke coils
EP2452752A1 (fr) 2010-11-11 2012-05-16 Thermo Fisher Scientific Oy Pipette à poignée
WO2022104641A1 (fr) * 2020-11-18 2022-05-27 吴江变压器有限公司 Transformateur de distribution à haut rendement

Also Published As

Publication number Publication date
DE9202442U1 (de) 1993-06-17

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