EP0165435A1 - Verfahren zur Herstellung einer Unterspannungswicklung für Transformatoren - Google Patents

Verfahren zur Herstellung einer Unterspannungswicklung für Transformatoren Download PDF

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Publication number
EP0165435A1
EP0165435A1 EP85105657A EP85105657A EP0165435A1 EP 0165435 A1 EP0165435 A1 EP 0165435A1 EP 85105657 A EP85105657 A EP 85105657A EP 85105657 A EP85105657 A EP 85105657A EP 0165435 A1 EP0165435 A1 EP 0165435A1
Authority
EP
European Patent Office
Prior art keywords
winding
casting
temperature
hardened
glass transition
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.)
Granted
Application number
EP85105657A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0165435B1 (de
Inventor
Wolfgang Ing.-Grad. Bendel
Klaus Dr. Dipl.-Chem. Kretzschmar
Helmut Dr. Dipl.-Chem. Markert
Wolfgang Dr. Dipl.-Chem. Rogler
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 AT85105657T priority Critical patent/ATE31126T1/de
Publication of EP0165435A1 publication Critical patent/EP0165435A1/de
Application granted granted Critical
Publication of EP0165435B1 publication Critical patent/EP0165435B1/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
    • 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
    • H01F41/04—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 for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating

Definitions

  • the invention relates to a method for producing undervoltage winding for transformers made of strip material wound spirally with intermediate insulating layers and with a sprue of cast resin on each of the two annular end faces.
  • undervoltage windings are provided, for example, in winding arrangements of air-cooled transformers in accordance with DE-OS 22 46 235 and DE-OS 26 40 595.
  • the sprues on the annular end faces of the undervoltage windings are used to seal them moisture-proof and electrically.
  • peroxidically curing unsaturated polyester resins are used in the known arrangements.
  • German patent applications P 33 23 153.2 and P 33 23 154.0 have proposed reaction resin mixtures of polyfunctional epoxies and polyfunctional isocyanates as essential components which can withstand these loads.
  • the processing tion of these known cast resin mixtures requires a potting with reduced ambient air pressure and long residence times of each individual potting in the mold.
  • the invention is therefore based on the object to provide a process for the undervoltage windings of dry-type transformers to be covered only with casting resin, which process can be used economically and enables the production of castings from casting resin, which also corresponds to temperature class F at temperatures above 155 * C and higher ensure operation without cracking.
  • an NN-dimethylbenzylamine serves as the reaction accelerator and the winding remains on the winding core during the sprues, while curing at 100 ° C. to 140 ° . C takes place only after the winding has been removed from the winding core.
  • the curing temperature is exceeded during a warm-up of the transformer for test purposes and the glass transition temperature is thereby increased at the same time.
  • the method according to the invention is very advantageous because, in spite of the gates taking place in succession, it enables practically continuous work on the winding being treated in each case and because it also ensures the production of very temperature-resistant gates.
  • An iron core 1 composed of sheet metal lamellae with yokes 2 is held together by bandages 3.
  • the yokes 2 are also together by Jochpreßbalken 4 hold, which simultaneously transmit axial clamping forces of an undervoltage winding 5 and an overvoltage winding 6 to tension cover plates 7 resting on the iron core.
  • the yoke press beams 4 on the lower yoke 6 carry angles 8 which are part of a chassis 9 with rollers 10.
  • the undervoltage winding 5 and the high-voltage winding 6 are clamped between them press blocks 11, the required clamping force being set by pressing elements 13 which support the upper yoke 2.
  • the press blocks 11 are provided with elastic supports 12 which simultaneously compensate for manufacturing tolerances of the undervoltage winding 5 and the high-voltage winding 6 and decouple the latter from the iron core 1 and the yokes 2 in terms of vibration technology.
  • the high-voltage winding 6 is completely encased in casting resin and consists of coils electrically connected in series.
  • the high-voltage windings 6 of the three phases of the same transformer are connected to one another by switching strips 14, preferably in a delta connection.
  • the undervoltage winding 5 consists essentially of a spirally wound strip material 15, the width of which is approximately equal to the length of the legs in the axial direction.
  • a prepreg film 16 which is somewhat wider than the strip material 15 and consequently protrudes somewhat at both ends of the winding in the axial direction, is used for the electrical insulation of the windings lying one on top of the other.
  • a sprue 17 of cast resin is cast onto the annular end faces of the undervoltage winding 5.
  • Each of these sprues 17 seals the winding end face covered by it and at the same time protects the edges of the prepreg film 16 which it surrounds from mechanical damage.
  • Casting strips that run in with the first and last turns serve as the shape for the sprues, with a sprue 17 initially being cast from above with the winding axis standing vertically and, after it has solidified, the second sprue 17 in turn being cast from above after the winding has been turned over.
  • a mixture of polyepoxy resins and isocyanate resins is used as the casting resin.
  • This mixture solidifies by adding a reaction accelerator, for example N.N-dimethylbenzylamine (DMBA), at room temperature in a short time to such an extent that it can be mechanically loaded at least with the weight of the undervoltage winding 5 at room temperature.
  • DMBA N.N-dimethylbenzylamine
  • This cold-curing casting resin can also be used to cast other parts of dry transformers that are subject to high mechanical and thermal stress. This applies in particular to parts for which a conventional vacuum casting with gelling at elevated temperature is not possible or uneconomical for manufacturing reasons.
EP85105657A 1984-05-21 1985-05-08 Verfahren zur Herstellung einer Unterspannungswicklung für Transformatoren Expired EP0165435B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85105657T ATE31126T1 (de) 1984-05-21 1985-05-08 Verfahren zur herstellung einer unterspannungswicklung fuer transformatoren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3418823 1984-05-21
DE3418823 1984-05-21

Publications (2)

Publication Number Publication Date
EP0165435A1 true EP0165435A1 (de) 1985-12-27
EP0165435B1 EP0165435B1 (de) 1987-11-25

Family

ID=6236421

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105657A Expired EP0165435B1 (de) 1984-05-21 1985-05-08 Verfahren zur Herstellung einer Unterspannungswicklung für Transformatoren

Country Status (4)

Country Link
EP (1) EP0165435B1 (es)
AT (1) ATE31126T1 (es)
BR (1) BR8502366A (es)
DE (1) DE3561089D1 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103077820A (zh) * 2012-12-31 2013-05-01 湖南广信电工科技有限公司 卷制式调压斜端圈生产工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT239369B (de) * 1963-04-11 1965-04-12 Siemens Ag Verfahren zur Herstellung von Gegenständen, insbesondere von Isolierungen elektrischer Maschinen, Geräte oder Apparate, durch Vergießen oder Imprägnieren mit zur Polymerisations- oder Polyadditionsreaktion fähigen Stoffsystemen
DE1540133A1 (de) * 1965-12-21 1969-12-11 Licentia Gmbh Verwendung eines aus zwei Baendern zusammengesetzten Isoliermaterials fuer die Herstellung einer Wicklungsisolation,insbesondere von Hochspannungsspulen
DE2922065A1 (de) * 1978-06-02 1979-12-06 Hitachi Ltd Verfahren zur herstellung elektrischer wicklungen
EP0129819A1 (de) * 1983-06-27 1985-01-02 Siemens Aktiengesellschaft Verfahren zur Imprägnierung und Einbettung von elektrischen Wicklungen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT239369B (de) * 1963-04-11 1965-04-12 Siemens Ag Verfahren zur Herstellung von Gegenständen, insbesondere von Isolierungen elektrischer Maschinen, Geräte oder Apparate, durch Vergießen oder Imprägnieren mit zur Polymerisations- oder Polyadditionsreaktion fähigen Stoffsystemen
DE1540133A1 (de) * 1965-12-21 1969-12-11 Licentia Gmbh Verwendung eines aus zwei Baendern zusammengesetzten Isoliermaterials fuer die Herstellung einer Wicklungsisolation,insbesondere von Hochspannungsspulen
DE2922065A1 (de) * 1978-06-02 1979-12-06 Hitachi Ltd Verfahren zur herstellung elektrischer wicklungen
EP0129819A1 (de) * 1983-06-27 1985-01-02 Siemens Aktiengesellschaft Verfahren zur Imprägnierung und Einbettung von elektrischen Wicklungen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, Band 1, Nr. 80, 27 Juli 1977, Seite 1414 E 77; & JP - A - 52 16 604 (HITACHI SEISAKUSHO K.K.) 08-02-1977 *
PATENTS ABSTRACTS OF JAPAN, Band 7, Nr. 115 (E-176) [1260], 19 Mai 1983; & JP - A - 58 35 912 (HITACHI SEISAKUSHO K.K.) 02-03-1983 *

Also Published As

Publication number Publication date
ATE31126T1 (de) 1987-12-15
EP0165435B1 (de) 1987-11-25
BR8502366A (pt) 1986-01-21
DE3561089D1 (en) 1988-01-07

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