EP0166952B1 - Hochstromtransformator mit indirekter Spannungseinstellung über einen Zwischenkreis - Google Patents

Hochstromtransformator mit indirekter Spannungseinstellung über einen Zwischenkreis Download PDF

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Publication number
EP0166952B1
EP0166952B1 EP85106456A EP85106456A EP0166952B1 EP 0166952 B1 EP0166952 B1 EP 0166952B1 EP 85106456 A EP85106456 A EP 85106456A EP 85106456 A EP85106456 A EP 85106456A EP 0166952 B1 EP0166952 B1 EP 0166952B1
Authority
EP
European Patent Office
Prior art keywords
winding
wound
low
voltage
windings
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.)
Expired
Application number
EP85106456A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0166952A1 (de
Inventor
Günther Bonni
Donald Dr. Dipl.-Ing. Brandes (Fh)
Willi Dipl.-Ing. Dimmler (Fh)
Helmut Dipl.-Ing. Feyertag
Heinrich Groher
Leo Janner
August Kömp
Walter Dr. Dipl.-Ing. Müller
Alfred Dipl.-Ing. Süppel (FH)
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
Transformatoren Union AG
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 Transformatoren Union AG, Siemens AG filed Critical Transformatoren Union AG
Priority to AT85106456T priority Critical patent/ATE29332T1/de
Publication of EP0166952A1 publication Critical patent/EP0166952A1/de
Application granted granted Critical
Publication of EP0166952B1 publication Critical patent/EP0166952B1/de
Expired 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H01F2027/2838—Wires using transposed wires

Definitions

  • the invention relates to a high-current transformer with indirect voltage adjustment via an intermediate circuit, each consisting of a main and additional transformer arranged in a common boiler, each of which is made up of a plurality of parallel winding conductors and in cross section perpendicular to the winding axes together the shape of an 8 undervoltage windings with one another are electrically connected in series and have opposite winding directions as a result of intersecting connecting conductors.
  • furnaces In the chemical and metallurgical industries, electrically heated furnaces are used for a wide variety of purposes and operate at relatively low operating voltages with very high currents. Since the transmission of the high currents required for these furnaces over long distances is technically difficult and also uneconomical, transformers are usually set up in the immediate vicinity of the furnaces, in which electrical energy fed in with high voltage is brought to the desired voltage level.
  • CH-A-409 130 discloses a transformer unit with a high-current winding in which undervoltage windings, each consisting of a single turn, of a main and an additional transformer are connected in series. These two undervoltage windings together have the shape of an 8, but the conductor does not cross in the middle, so that the current flows through both windings in the same direction.
  • the invention is therefore based on the object of providing a type of winding and connection option for a high-current transformer for its high-current side, which ensures both good technical and good economic utilization of the material used, in particular the winding conductor material, and which is practically without restriction for any required current strength and number of turns of the undervoltage winding can be used.
  • radial cooling channels are provided at least between the opposite turns of mutually adjacent winding sections and that within the winding sections the transition from turn to turn takes place via an offset, and that successive winding sections have opposite winding directions in the axial direction .
  • the winding sections are electrically connected in parallel by soldering the leads into slots in solid printed circuit boards, one phase of each of these printed circuit boards being connected to high-current bushings in a boiler wall and the other printed circuit boards being either connected to a neutral point for the undervoltage windings of the three phases or are cyclically connected to the first-mentioned circuit boards to form an electrical delta circuit.
  • the arrangement according to the invention is very advantageous because it allows a very good utilization of the entire winding conductor material used with a very compact design of the winding as such. Due to this very good material utilization, high-current windings can be carried out in the boiler profile, which is limited for transport reasons, in a three-phase unit Can implement outputs of more than 100 MVA in continuous operation.
  • Core legs 8 of a three-leg iron core of a main transformer are concentrically comprised from the inside to the outside by a step winding 4, a high-voltage winding 3 and a low-voltage winding 1.
  • a three-leg iron core with core legs 9 is also provided for an additional transformer, each of which carries an overvoltage winding 5 and an undervoltage winding 2 concentrically from the inside to the outside.
  • the main transformer and the additional transformer are placed close together in a common boiler 10, which is usually filled with a cooling and insulating liquid.
  • the high-voltage winding 3 is connected to a high-voltage supply network via high-voltage bushings, not shown, and induces a voltage in the undervoltage winding 1 coupled to it via the iron core of the main transformer and in the step winding 4.
  • the step winding 4 feeds with a step switch 6 and a turner 7 according to size and Direction of adjustable voltage, the high-voltage winding 5 of the additional transformer.
  • the high-voltage winding 5, induces a voltage in the low-voltage winding 2, which as a result of a series connection of the two low-voltage windings 1 and 2 is vectorially added or subtracted to the voltage induced by the high-voltage winding 3 in the low-voltage winding 1.
  • the undervoltage winding 1 and the undervoltage winding 2 are constructed from an equal number of electrically parallel winding sections made of stranded conductors as winding conductors and each have three turns in the exemplary embodiment shown.
  • Each of the winding conductors forms a single-layer winding section in each of the two undervoltage windings 1 and 2.
  • the winding sections of the undervoltage windings 1 and 2 assigned to the same phase are each connected in series, the connecting conductor 17 representing winding conductor pieces crossing between the undervoltage windings 1 and 2, so that the undervoltage windings 1 and 2 have opposite winding directions.
  • the shape of an 8 with three turns in each of the two winding sections results at right angles to the winding axes.
  • the two winding sections each connected in series from the undervoltage windings 1 and 2 are wound in one go to avoid soldering points.
  • a sufficiently long winding conductor piece for the last half turn and a rejection of the winding section to be wound last is fixed on the winding core used first.
  • the winding section to be wound first in the exemplary embodiment shown three windings of one strand for the undervoltage winding 1, is finished wound on this winding core.
  • the winding core is now shifted on the winding bench approximately at right angles to the winding conductor strand running up by the center distance of the undervoltage windings 1 and 2 transversely to the winding axis, and a second winding core is attached to the winding axis on the winding bench.
  • the second winding core protrudes from the first in the axial direction, so that the second winding section, in the illustrated embodiment two and a half turns of the undervoltage winding 2, can be wound slightly axially offset without interrupting the winding conductor strand.
  • the winding conductor is cut off and the end is bent and fixed to lead out. Now the winding conductor piece lying in front of the beginning of the first winding section is detached from the winding core used first, placed around the second winding core to form a half turn and likewise fixed to the end of this winding section after the second rejection has been bent.
  • the two winding sections wound in series from one piece form a self-supporting component that can be handled as an independent element until later installation in the transformer arrangement.
  • any number of these independent elements can therefore be stacked axially one above the other without difficulty be stacked.
  • the number of parallel displays can therefore be selected as required, so that the undervoltage windings 1 and 2 can be adapted to virtually any winding current.
  • a first printed circuit board 12 with high-current bushings 13 and a second printed circuit board 12 for each phase are connected either to a star point or to the cyclically following printed circuit board 12 of the next phase to form an electrical delta connection.
  • radial cooling channels 15 are provided between the individual windings, but at least between axially adjacent winding sections.
  • axially different current distribution to the parallel branches means that the high-voltage windings 3 and 5 are shorter in the axial direction than the respectively associated undervoltage winding 1 or 2.
  • the winding arrangements of the individual phases each have a pressboard jacket 20 that completely surrounds them, which is supported by spacer bars 21 on the circumference of one of the undervoltage windings 1 or 2.
  • These press clamping sleeves 20 serve to guide the cooling liquid by forcing them to flow through the windings even when driven by a circulating pump.
  • the heat dissipation from the windings is increased, so that, compared to arrangements with a cooling circuit driven purely thermally by convection, higher powers can be implemented with the same winding volume.
  • the winding structure according to the invention is suitable for all transformer and choke coil windings with two or more turns which are loaded with very large currents.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Details Of Television Scanning (AREA)
  • Electron Sources, Ion Sources (AREA)
EP85106456A 1984-06-07 1985-05-24 Hochstromtransformator mit indirekter Spannungseinstellung über einen Zwischenkreis Expired EP0166952B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85106456T ATE29332T1 (de) 1984-06-07 1985-05-24 Hochstromtransformator mit indirekter spannungseinstellung ueber einen zwischenkreis.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3421277 1984-06-07
DE3421277 1984-06-07

Publications (2)

Publication Number Publication Date
EP0166952A1 EP0166952A1 (de) 1986-01-08
EP0166952B1 true EP0166952B1 (de) 1987-09-02

Family

ID=6237868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85106456A Expired EP0166952B1 (de) 1984-06-07 1985-05-24 Hochstromtransformator mit indirekter Spannungseinstellung über einen Zwischenkreis

Country Status (5)

Country Link
EP (1) EP0166952B1 (pt)
AT (1) ATE29332T1 (pt)
BR (1) BR8502692A (pt)
DE (1) DE3560541D1 (pt)
NO (1) NO164867C (pt)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5604352A (en) * 1995-04-25 1997-02-18 Raychem Corporation Apparatus comprising voltage multiplication components
FR2742572B3 (fr) * 1995-12-19 1997-12-26 France Transfo Sa Enroulement inductif bobine en galettes pour transformateurs

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1028950A (fr) * 1950-11-08 1953-05-28 Appareil électrique à induction
CH328157A (de) * 1954-03-04 1958-02-28 Ckd Ceska Lipa Narodni Podnik Gerät für elektrisches Widerstandserwärmen
DE1198924B (de) * 1961-03-15 1965-08-19 Alexander Gattermeier OElgekuehlter, primaerseitig umschaltbarer Hoch-stromschwingtransformator fuer Mittelfrequenz
DE2736092A1 (de) * 1977-08-10 1979-02-22 Transformatoren Union Ag Wicklung fuer transformatoren mit zwei windungen fuer sehr hohe elektrische stroeme

Also Published As

Publication number Publication date
BR8502692A (pt) 1986-02-12
NO164867C (no) 1990-11-21
ATE29332T1 (de) 1987-09-15
EP0166952A1 (de) 1986-01-08
NO164867B (no) 1990-08-13
DE3560541D1 (en) 1987-10-08
NO852236L (no) 1985-12-09

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