EP0107011B1 - Procédé de revêtement de couches isolantes sur des bandes en cuivre ou en aluminium - Google Patents

Procédé de revêtement de couches isolantes sur des bandes en cuivre ou en aluminium Download PDF

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Publication number
EP0107011B1
EP0107011B1 EP83109081A EP83109081A EP0107011B1 EP 0107011 B1 EP0107011 B1 EP 0107011B1 EP 83109081 A EP83109081 A EP 83109081A EP 83109081 A EP83109081 A EP 83109081A EP 0107011 B1 EP0107011 B1 EP 0107011B1
Authority
EP
European Patent Office
Prior art keywords
aluminium
copper strip
deposition
guide roller
copper
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
EP83109081A
Other languages
German (de)
English (en)
Other versions
EP0107011A1 (fr
Inventor
Dieter Gröppel
Gisela Siemsen
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
Priority to AT83109081T priority Critical patent/ATE20676T1/de
Publication of EP0107011A1 publication Critical patent/EP0107011A1/fr
Application granted granted Critical
Publication of EP0107011B1 publication Critical patent/EP0107011B1/fr
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • C25D13/16—Wires; Strips; Foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes

Definitions

  • the invention relates to a device for producing temperature-resistant insulating layers on aluminum or copper strips in accordance with the preamble of claim 1.
  • foils or strips made of aluminum or copper are used for both the high-voltage winding and the low-voltage winding.
  • the individual tapes are insulated from one another, in particular in the case of high-voltage winding, by high-quality insulating foils, for example made of polyethylene terephthalate (PETP).
  • PETP polyethylene terephthalate
  • the insulating foils previously used in cast-resin-insulated distribution transformers in the coil windings also only allow operating temperatures up to 130 ° C. However, a temperature resistance of up to approx. 155 ° C is aimed for. There is therefore interest in replacing the insulating films with other suitable measures.
  • electrophoresis It is known to produce insulating layers by means of electrophoresis (see: DE-B-1 007 593 and FR-A-1 439867 and «Siemens-Zeitschrift •, 44th year, 1970, pages 231 to 233).
  • electrophoresis solid particles which are dispersed in a more or less insulating medium and which charge at their interfaces with the surrounding medium migrate under the influence of an external electrical field and are then deposited on a metallic base.
  • the electrical conductor for example a metallic wire or a metallic strip
  • the electrical conductor is passed as an anode through a deposition vessel provided with a cathode, which contains a deposition bath, for example in the form of an aqueous dispersion of polytetrafluoroethylene and an organopolysiloxane resin.
  • a deposition bath for example in the form of an aqueous dispersion of polytetrafluoroethylene and an organopolysiloxane resin.
  • means for deflecting the conductor can be provided above the deposition vessel and on the bottom thereof.
  • the coated conductor is then passed through a drying device, for example an oven, the layer deposited on the conductor being dried and hardened.
  • the object of the invention is the continuous production of mechanically stable and temperature-resistant insulating layers on aluminum and copper strips, it being particularly important that the edges of the aluminum or copper strips are also completely coated.
  • the device according to the invention enables a continuous coating of the metallic strips.
  • the strips are shielded against the applied electric field in such a way that the solid particles are only separated over a relatively short distance - in the area of the counterelectrode (s).
  • the coated strips then preferably exit the separating device vertically and are subsequently guided into the drying device arranged above the separating device.
  • the solid particles, in particular mica, are so tightly packed in the drying device that a layer is formed which is voltage-resistant up to more than 1 kV.
  • a mica / silicone rubber dispersion or suspension is preferably used in the electrophoresis, i. H. a layer of mica and silicone rubber is applied to the aluminum and copper strips (so-called mica electrophoresis); the metallic strips serve as an anode. This achieves a complete and even coating - including the edges - that is resistant up to 155 ° C.
  • the insulating layers according to the invention meet all the requirements with regard to dielectric strength, temperature resistance, edge coverage, visible thickness and cast resin compatibility, which are placed on the windings of cast-resin-insulated distribution transformers. Aluminum and copper strips provided with such insulating layers are therefore particularly well suited for this application.
  • FIG. 1 schematically shows a preferred embodiment of the device according to the invention, which essentially consists of a separation device 10, a dryer tion device 11, a pulling device 12 and a winding device 13.
  • the aluminum or copper band 14 (with a width of approximately between 5 and 10 cm and a thickness of approximately 0.25 mm), also referred to below as a band, runs from a supply roll 15 via deflection rolls 16, 17 and 18 and through the separation device 10 and from there into the drying device 11.
  • the drying device 11 which has a height of approximately 12 m, is composed of individual tubes 19, which are made of glass, for example.
  • the tubes 19 each have a height of 1.5 m and are sealed off from one another by sealing rings 20, for example made of polytetrafluoroethylene.
  • sealing rings 20 for example made of polytetrafluoroethylene.
  • thermal insulation 24 is also attached, which extends approximately over a height of 3.5 m.
  • the heat insulation preferably consists of heat-conducting and heat-insulating layers which are used for heat transport in the axial direction or for heat insulation in the radial direction (materials: copper mesh or asbestos and rock wool).
  • the above-described special configuration of the drying device produces a temperature profile therein, which ensures that, for example, a mica / silicone rubber suspension applied to the belt 14 is dried and cured to a sufficient extent in the time available (approx. 15 minutes) .
  • a temperature of approx. 60 ° C at which drying begins.
  • the temperature then rises from this initial value to a value of approximately 200 ° C. at the beginning of the part of the drying device provided with the thermal insulation; here the insulation layer is completely dried.
  • the temperature rises from 200 ° C. to approximately 260 ° C., the silicone rubber being cured.
  • the band 14 provided with the insulating layer is cooled by means of a suitable device 25, for example by means of a hair dryer, and then reaches the pulling device 12 via two deflection rollers 26 and 27, which ensures a uniform pulling speed of the band (approx. 75 cm / min).
  • the pulling device has a (drive) shaft 28 which is driven by a motor via a gear; the drawing speed can be changed by changing the voltage applied to the motor.
  • a movably mounted roller 29 presses the belt 14 against the shaft 28 and in this way ensures the necessary synchronism.
  • the winding device consists of a rotatably mounted roller 30 with attached pulley 31, which is driven by a DC motor with a gear 32 via a pulley 33 and a drive belt 34 (in the form of a round cord ring) also serves as a slip clutch, is driven.
  • FIG. 2 shows a preferred embodiment of the deposition device of the device according to the invention for producing insulating layers.
  • the deposition device 40 which is made, for example, of polymethyl methacrylate, essentially consists of the following parts: a housing 41; a first block 42 arranged on an inner side of the housing 41, which carries a first deflection roller 43 arranged above the actual separation device; a second deflection roller 43, which is arranged approximately in the middle of the separation device; an ordered block 44, in the lower area of which a second deflection roller 45 is attached; a third block 46 arranged parallel to the other two blocks 42 and 44 on the inside of the housing 41.
  • the blocks 42 and 44 or 44 and 46 are each arranged closely adjacent to one another with plane-parallel sides, so that two gaps 47 and 48 are formed in this way.
  • the gaps 47 and 48 each about 5 mm wide, prevent premature separation.
  • the gap 48 widens in the upper area to the actual deposition space 49, which is approx. 10 cm long, approx. 5 cm wide and approx. 7 cm high.
  • the deposition space 49 has two counter electrodes, for example in the form of metal sheets.
  • One counter electrode 50 is attached to block 44, the other counter electrode (not visible in the figure) to block 46, in a manner corresponding to counter electrode 50 and thus also parallel to it.
  • the metallic strip which first runs over the deflection roller 43, then through the gap 47, then over the deflection roller 45 and finally through the gap 48, can be coated on both sides in the deposition space 49. If the coating is to be carried out only on one side of the strip, one of the two counter electrodes, generally the electrode attached to block 46, is omitted. In this case, the gap 48 does not widen in the direction of the block 46, but only in the direction of the block 44, or in such a case the block 46 can be omitted entirely, so that the gap from the block 44 and the opposite housing wall is formed.
  • the dispersion containing the solid particles is fed to the separation device 40 - from a storage container - by means of a hose pump via four connections; two connections 51 and 52 are located on the front of the housing, the other two - in the appropriate position - on the back. In each of the four connections there is a nozzle (diameter: 2 mm) through which the dispersion enters the separation device is injected. In this way, sedimentation of the solid particles can be prevented without the need for stirring.
  • the dispersion rises within the separation device in the gap 48 (and also in the gap 47) and reaches the separation space 49, from which it flows back into the storage container through two slots 53 arranged in each side wall.
  • the discharge height can be varied by a suitable mechanism at the slots 53 and thus the height of the liquid level in the separation space 49 can be changed.
  • the counter electrodes which are made of nickel, for example, are connected to the negative pole of a DC voltage source, so they serve as cathodes.
  • the metallic tape to be insulated serves as an anode and is connected accordingly to the positive pole of the DC voltage source. The contact takes place, for example, in front of the deflection roller 43 (see FIG. 2).
  • a mica / silicone rubber suspension is preferably used for electrophoresis in the deposition device; Mica and silicone rubber are preferably approximately in the ratio of 1: 1.
  • the solid particles are generally suspended in water, but xylene may also be present in the suspension; the solids content of the suspension is preferably about 200 to 250 g / l.
  • the deposition is preferably carried out at a voltage of approx. 80 V. With this deposition voltage and at a pulling speed of approx. 75 cm / min, a liquid height of approx. 15 mm is required in the deposition space, for example, in order to apply insulating layers with a layer thickness of approx. 25 to To get 30 ⁇ m.
  • Aluminum sheets coated under the above-mentioned conditions prove to be stress-resistant - also in long-term tests - both at room temperature and at 155 ° C.
  • a voltage of 220 V and 1000 V was optionally applied to the sheets, which were each clamped between two plastic plates, in such a way that the sheets were continuously, i.e. H. over weeks (approx. 2500 h), a voltage of 220 V was applied and the system was switched to 1000 V several times a day, each for a few seconds.
  • the compatibility of the coated strips with casting resin which is required for use in distribution transformers, was investigated in such a way that two coated aluminum sheets were glued together by means of the casting resin; the resin was then cured at an elevated temperature. The sheets were then firmly connected and could only be separated by force. The connection between the aluminum sheet and the insulation layer was mostly broken, and the insulation layer and casting resin were only separated to a small extent.
  • a dialyzer can advantageously be provided in the device according to the invention, by means of which the electrical conductivity of the dispersion is kept low - by deionization; it is preferably below 500 p.S / cm.
  • the dialysis device is arranged between the storage vessel for the dispersion and the separation device.
  • part of the line through which the dispersion is conveyed to the deposition device can be passed through a dialysis tube, ie. H. a semipermeable membrane.
  • a jacket is placed around the dialysis tube through which pure dispersion medium flows - in the form of distilled water. In this way, ions from the dispersion migrate through the membrane into the water, reducing the conductivity of the dispersion.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Insulating Bodies (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Insulated Conductors (AREA)
  • Coating Apparatus (AREA)

Claims (5)

1. Installation de production de couches isolantes et résistantes à la chaleur sur des bandes d'aluminium ou de cuivre, comprenant un dispositif (10, 40) de dépôt par électrophorèse de particules de matière solide d'une dispersion sur une bande d'aluminium ou de cuivre (14) et un dispositif (11) pour sécher la couche déposée sur la bande d'aluminium ou de cuivre (14), la bande d'aluminium ou de cuivre étant reliée à l'un des pôles d'une source de tension continue et le dispositif de dépôt (10, 40) comportant au moins une contre-électrode (50) connectée à l'autre pôle de la source de tension continue, des moyens (51, 52, 53) étant prévus dans le dispositif de dépôt (10, 40) pour faire circuler la dispersion et il est prévu, au-dessus du dispositif de dépôt (10, 40), un premier rouleau de renvoi (17, 43) de la bande d'aluminium ou de cuivre (14) et, au fond du dispositif de dépôt (10, 40) un second rouleau de renvoi (18, 45), caractérisée en ce qu'il est prévu entre le premier rouleau de renvoi (17, 43) et le second rouleau de renvoi (18, 45), une première fente (47) verticale pour le transport de la bande d'aluminium ou de cuivre (14) et, à la suite du second rouleau de renvoi (18, 45) une seconde fente (48) verticale, en ce que la seconde fente (48) s'élargit en une chambre de dépôt (49) et en ce que dans la chambre de dépôt (49) est (sont) disposée(s) la (les) contre-électrodes(s) (50) parallèlement à la bande d'aluminium ou de cuivre (14) qui passe, la bande d'aluminium ou de cuivre (14) étant soumise au champ électrique, pour l'essentiel, seulement dans la région de la contre-électrode ou des contre-électrodes (50), mais en étant sinon protégée.
2. Installation suivant la revendication 1, caractérisée en ce que le dispositif de séchage (11) est disposé au-dessus du dispositif de dépôt (10) et en ce qu'il est prévu des moyens (21, 22, 23, 24) pour établir dans le dispositif de séchage (11) un profil de température croissant suivant le sens de transport de la bande d'aluminium ou de cuivre (14).
3. Installation suivant la revendication 2, caractérisée en ce qu'à l'extrémité supérieure du dispositif de séchage (11) est prévu au moins un appareil (21, 22) d'amenée d'air chaud et, à l'extrémité inférieure, un dispositif d'aspiration (23).
4. Installation suivant la revendication 2 ou 3, caractérisée en ce que la partie supérieure du dispositif de séchage (11) comporte une isolation thermique (24).
5. Installation suivant l'une ou plusieurs des revendications 1 à 4, caractérisée en ce qu'il est prévu un dispositif de dialyse pour maintenir à un faible niveau la conductibilité électrique de la dispersion.
EP83109081A 1982-09-27 1983-09-14 Procédé de revêtement de couches isolantes sur des bandes en cuivre ou en aluminium Expired EP0107011B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83109081T ATE20676T1 (de) 1982-09-27 1983-09-14 Vorrichtung zur erzeugung von isolierschichten auf aluminium- oder kupferbaendern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3235742 1982-09-27
DE19823235742 DE3235742A1 (de) 1982-09-27 1982-09-27 Vorrichtung zur erzeugung von isolierschichten auf aluminium- oder kupferbaendern

Publications (2)

Publication Number Publication Date
EP0107011A1 EP0107011A1 (fr) 1984-05-02
EP0107011B1 true EP0107011B1 (fr) 1986-07-09

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EP83109081A Expired EP0107011B1 (fr) 1982-09-27 1983-09-14 Procédé de revêtement de couches isolantes sur des bandes en cuivre ou en aluminium

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EP (1) EP0107011B1 (fr)
AT (1) ATE20676T1 (fr)
DE (2) DE3235742A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539737A1 (de) * 1985-11-08 1987-05-21 Transformatoren Union Ag Wicklung fuer transformatoren und drosselspulen
FR2670397A1 (fr) * 1990-12-17 1992-06-19 Pechiney Recherche Perfectionnement au procede de fabrication de membrane semi-permeable sur support poreux souple.
US9597747B2 (en) * 2012-11-15 2017-03-21 Afl Telecommunications Llc Methods for applying aluminum coating layer to a core of copper wire

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB723072A (en) * 1951-10-30 1955-02-02 Gen Electric Improvements in and relating to insulating coatings on conductors
BE671644A (fr) * 1964-11-27
CA984331A (en) * 1972-07-27 1976-02-24 Michael A. Dudley Electrocoating process and apparatus
US4162955A (en) * 1978-10-10 1979-07-31 Midland-Ross Corporation Electrodeposition coating apparatus

Also Published As

Publication number Publication date
DE3235742A1 (de) 1984-03-29
ATE20676T1 (de) 1986-07-15
DE3364436D1 (en) 1986-08-14
EP0107011A1 (fr) 1984-05-02

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