EP0295669B1 - Verfahren zum Einbetten eines elektrischen Wickelgutes in eine Isoliermasse und dazu verwendete Giessform - Google Patents

Verfahren zum Einbetten eines elektrischen Wickelgutes in eine Isoliermasse und dazu verwendete Giessform Download PDF

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Publication number
EP0295669B1
EP0295669B1 EP19880109591 EP88109591A EP0295669B1 EP 0295669 B1 EP0295669 B1 EP 0295669B1 EP 19880109591 EP19880109591 EP 19880109591 EP 88109591 A EP88109591 A EP 88109591A EP 0295669 B1 EP0295669 B1 EP 0295669B1
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EP
European Patent Office
Prior art keywords
mould
coil windings
insulating compound
coil winding
coil
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 - Lifetime
Application number
EP19880109591
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German (de)
English (en)
French (fr)
Other versions
EP0295669A1 (de
Inventor
Günther Mittelstädt
Hartmut Nendel
Rainer Sigloch
Roland Hyalmar Bruder
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.)
Alcatel Lucent Deutschland AG
Original Assignee
Alcatel SEL 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
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Application filed by Alcatel SEL AG filed Critical Alcatel SEL AG
Priority to AT88109591T priority Critical patent/ATE71768T1/de
Publication of EP0295669A1 publication Critical patent/EP0295669A1/de
Application granted granted Critical
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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 embedding an electrical winding material, in particular a transformer coil, in an insulating compound, and a casting mold used to carry out this method.
  • the windings are covered with an insulating film, for example, before the jacket and core parts are put together.
  • parts of the windings remain free, which result in creepage distances and can also lead to electrical flashovers.
  • transformers, transducers or the like to embed the iron core together with the windings in a closed insulation (DE-OS 20 24 522).
  • the iron core and the windings are inserted into a housing and cast with a plastic compound, the housing serving as a lost shape. Due to shrinking processes when the plastic mass cools, considerable forces can be exerted on the windings and the iron core, which lead to the damage of these parts.
  • the invention has for its object to provide a method of the type mentioned, with which an electrical winding material can be completely and exactly embedded in an insulating compound without fear of damage to the core or the windings.
  • the advantages of the invention are, in particular, that the leakage of resins, lacquers or potting compounds serving as an insulating compound is prevented.
  • the casting mold can be used several times, it also serves as a transport device for the winding material. If the casting mold is designed as a multiple use, the throughput can be increased. Inserts such as Terminal pins can be positioned very precisely in the mold.
  • the casting mold which is made from an elastic, rubber-like silicone, can be easily reproduced by producing a metal master mold. It can be used in several operations and can easily withstand temperatures up to around 140 ° C. With a complicated form of the winding material, both a complete and a step casting is possible.
  • a metal model - or master form - 1 has the dimensions and shape that the electrical winding material embedded in the insulating material - e.g. a transformer coil - in the finished state, i.e. after embedding or soaking in a soaking medium ( Figure 1).
  • the metal model 1 is used to produce a casting mold as described below, which is used to carry out the method according to the invention.
  • the metal model 1 is placed in a tundish 2 (FIG. 2) and fastened to the bottom thereof, for example with a double-sided adhesive tape 3. After that the Casting trough 2 filled with a silicone casting compound which, after it has hardened, gives a casting mold 4 with an elastic, rubber-like consistency.
  • the finished casting mold 4 (FIG. 3) has a cutout 5 for the body to be embedded or soaked in an insulating compound, which has approximately the shape of a hollow cylinder in the exemplary embodiment shown. It is a transformer or transformer coil into which a cylindrical core part with a tight fit is inserted after being embedded in the insulating material.
  • the transformer coil 6 to be embedded is then inserted into the casting mold 4 (FIG. 4). Cavities 7 can be seen from the drawing, which are to be completely filled with the insulating compound.
  • the casting mold 4 with the transformer coil 6 contained therein is introduced into a tub 8 (FIG. 5) and the tub 8 is then filled with a flowable insulating compound - or impregnating medium - 9 to such an extent that the transformer coil - at least as far as it is to be embedded - from the insulating compound 9 is covered.
  • the tub 8 is placed under vacuum and the vacuum is maintained for a predetermined period of time, for example half an hour. In any case, no more air bubbles may escape from the winding material. The atmospheric pressure is then restored. Since the impregnating medium develops air bubbles during evacuation, the tub 8 must be carefully evacuated.
  • the mold 4 is removed together with the transformer coil 6 from the tub 8. Pins 10 of the transformer coil 6 are cleaned of the insulating compound. Thereafter, the transformer coil 6 still remaining in the casting mold 4 is placed in an oven, heated to the hardening temperature and left to act until the insulating compound 9 has hardened. Finally, the finished transformer coil 6 embedded in the insulating material is removed from the casting mold. The removal takes place without any particular difficulties because the mold is made of an elastic material, as mentioned.
  • the hardened insulating compound 9 can be seen in the broken-open area. It can also be seen from the drawing that the windings 11 of the transformer coil 6 are impregnated perfectly with the insulating compound 9 and are completely surrounded by it. This has been confirmed in the practical test in which embedded winding material has been cut open after completion.
  • a reusable casting mold can be produced in multiple uses.
  • the metal models 13 are each provided with a permanent magnet 14 with which they adhere to the bottom of the tub 12.
  • the filling of a silicone casting compound in the tub 12 and the curing of this casting compound is carried out as described above.
  • the metal models 13 are provided with so-called perforated needles 15, which keep openings 17 free in the finished multiple-use mold 16 (FIG. 8). These openings 17 are used to fasten an insert 18 - e.g. a toroidal core - which is embedded in the insulating material together with the winding material.
  • the multiple-use mold 16 can also be designed as a split.
  • the casting mold 16 can simultaneously produce a plurality of transformer coils 20 or other winding goods — shown schematically in FIG. 9.
  • An example of an insulating compound used in the process described is the commercially available Araldit casting resin F (CY 205) which, before being introduced into the tub 8 or 12, is heated to about 60 ° C. with stirring and then with an accelerator - about 0.6 parts by weight - is mixed thoroughly. Then a hardener heated to about 20 ° C - about 100 parts by weight - is added and mixed homogeneously. This mixture must be degassed under vacuum until no more foam appears. The winding material is to be poured over with the impregnating resin, which has a temperature of approximately 40 ° C., until it is approximately 10 to 20 mm high. The curing time depends on the temperature, at a temperature of 100 ° C it is at least 6 hours.
  • a suitable impregnating lacquer for example Herberts impregnating lacquer E 1131, can also be used as an insulating compound for embedding the winding material instead of the above-mentioned casting resin.
  • the glow exposure voltage which is a measure of the dielectric strength inside the coil, can be increased considerably in the case of the electrical winding goods embedded in the insulating material.
  • the casting mold 4 or 16 made of an elastic silicone enables the wrapping material to be embedded very evenly and prevents the lacquer and resin from running out during the embedding process. It also serves as a means of transport during the individual process stages and can be easily reproduced with the help of the metal model 13.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
EP19880109591 1987-06-19 1988-06-16 Verfahren zum Einbetten eines elektrischen Wickelgutes in eine Isoliermasse und dazu verwendete Giessform Expired - Lifetime EP0295669B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88109591T ATE71768T1 (de) 1987-06-19 1988-06-16 Verfahren zum einbetten eines elektrischen wickelgutes in eine isoliermasse und dazu verwendete giessform.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873720366 DE3720366A1 (de) 1987-06-19 1987-06-19 Verfahren zum einbetten eines elektrischen wickelgutes in eine isoliermasse und dazu verwendete giessform
DE3720366 1987-06-19

Publications (2)

Publication Number Publication Date
EP0295669A1 EP0295669A1 (de) 1988-12-21
EP0295669B1 true EP0295669B1 (de) 1992-01-15

Family

ID=6329957

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880109591 Expired - Lifetime EP0295669B1 (de) 1987-06-19 1988-06-16 Verfahren zum Einbetten eines elektrischen Wickelgutes in eine Isoliermasse und dazu verwendete Giessform

Country Status (4)

Country Link
EP (1) EP0295669B1 (es)
AT (1) ATE71768T1 (es)
DE (2) DE3720366A1 (es)
ES (1) ES2030111T3 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE518095C2 (sv) * 2000-03-30 2002-08-27 Evox Rifa Ab Förfarande för tillverkning av en impregnerad elektrisk komponent, sådan komponent, impregnerad lindning eller stapel samt impregnerad spole

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078651B (de) * 1957-12-04 1960-03-31 Felten & Guilleaume Carlswerk Verfahren zur Umhuellung elektrischer Bauelemente mit Giessharz
DE1112769B (de) * 1959-06-25 1961-08-17 Siemens Ag Verfahren zum feuchtedichten Einbau von elektrischen Kondensatoren oder anderen Bauelementen
US3548357A (en) * 1969-05-13 1970-12-15 Westinghouse Electric Corp Encapsulated electrical inductive apparatus
DE2058648B2 (de) * 1970-06-29 1978-08-24 Veb Transformatoren- Und Roentgenwerk Hermann Matern, Ddr 8030 Dresden Verfahren zum Imprägnieren und Vergießen einer Hochspannungswicklung aus Feindraht mit Gießharz
DE2032530A1 (de) * 1970-07-01 1972-01-05 Transformatoren Union Ag Verfahren zur Herstellung einer in Gießharz vergossenen Spulenanordnung
DE2554141A1 (de) * 1975-11-28 1977-06-02 Siemens Ag Mit kunststoff umgossene elektrische wicklung
CH624792A5 (en) * 1977-06-29 1981-08-14 Bbc Brown Boveri & Cie Electrical apparatus having an active part, which is potted in curable resin, and a method for its production
DE3234098A1 (de) * 1982-09-14 1984-03-15 Transformatoren Union Ag, 7000 Stuttgart Verfahren zur herstellung in giessharz eingebetteter wicklungen fuer transformatoren
DE3323154A1 (de) * 1983-06-27 1985-01-03 Siemens AG, 1000 Berlin und 8000 München Verfahren zur impraegnierung und einbettung von elektrischen wicklungen

Also Published As

Publication number Publication date
EP0295669A1 (de) 1988-12-21
DE3867721D1 (de) 1992-02-27
DE3720366A1 (de) 1988-12-29
DE3720366C2 (es) 1990-07-05
ATE71768T1 (de) 1992-02-15
ES2030111T3 (es) 1992-10-16

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