EP0167641B1 - Procédé de fabrication d'une fermeture étanche au gaz et à l'huile pour une construction de transformateur, et fermeture ainsi réalisée - Google Patents

Procédé de fabrication d'une fermeture étanche au gaz et à l'huile pour une construction de transformateur, et fermeture ainsi réalisée Download PDF

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Publication number
EP0167641B1
EP0167641B1 EP84107720A EP84107720A EP0167641B1 EP 0167641 B1 EP0167641 B1 EP 0167641B1 EP 84107720 A EP84107720 A EP 84107720A EP 84107720 A EP84107720 A EP 84107720A EP 0167641 B1 EP0167641 B1 EP 0167641B1
Authority
EP
European Patent Office
Prior art keywords
insulating material
layer
impregnated
oil
transformer board
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
EP84107720A
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German (de)
English (en)
Other versions
EP0167641A1 (fr
Inventor
Hermann Hummel
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.)
H Weidmann AG
Original Assignee
H Weidmann 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 H Weidmann AG filed Critical H Weidmann AG
Priority to EP84107720A priority Critical patent/EP0167641B1/fr
Priority to AT84107720T priority patent/ATE27075T1/de
Priority to DE8484107720T priority patent/DE3463585D1/de
Priority to FR8510183A priority patent/FR2567313B1/fr
Publication of EP0167641A1 publication Critical patent/EP0167641A1/fr
Application granted granted Critical
Publication of EP0167641B1 publication Critical patent/EP0167641B1/fr
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
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/28—Capacitor type

Definitions

  • Terminals in transformer construction are used to create a conductor connection and to shield this connection in the field. They generally consist of a shield electrode and an insulating holding element corresponding to the end form.
  • the insulating holding element carrying the shielding electrode and corresponding to the termination form consists of a transformer board.
  • the manufacture, the electrical and mechanical properties as well as the possible applications of Transformerboard are described in detail in Scientia electrica, volume 25, number 3, pages 1 to 120, year 1979.
  • a method according to the preamble of claim 1 can also be gathered from this literature reference.
  • the prior art also includes terminations made of synthetic resin, which, however, can only be produced in one standardized termination type per voltage series for manufacturing reasons, while variations in the dimensions and in the installation position cannot be made due to cost reasons. Furthermore, since it is also difficult to completely avoid gas bubble formation in vacuum casting technology, synthetic resin terminations for very high voltages pose great problems for electrical reasons. Another disadvantage is the limited electrical surface resilience of synthetic resins in oil due to the high dielectric constant.
  • the invention has for its object to develop a cost-effective method that allows the production of a vacuum-tight, oil-tight termination for transformer construction and that also makes it possible, in particular, to produce closures for a wide variety of dimensions and installation positions without great manufacturing outlay.
  • the transformer board-impregnated insulating material layers bring about a vacuum-tight and oil-tight separation of the spaces located on different sides of the seal.
  • the additional layers of insulating material provided on the exposed outer sides of the impregnated layer, together with the impregnated layer, ensure the required mechanical and electrical strength.
  • the closures produced by the method according to the invention maintain a pressure difference of at least 1.5 bar from the inside to the outside and from the outside to the inside. This has the advantage that now only the feedthrough or cable connection space for the oil filling has to be evacuated, which is possible with a relatively small pump set.
  • the closures form a very good barrier against oil and gas exchange between the oil-filled rooms to be separated.
  • the terminations produced by the method according to the invention can also be impregnated with oil and can therefore also be used at very high voltages below the permissible partial discharge level.
  • the resin-impregnated layers of insulating material from the transformer board can also be impregnated with oil, since only the cavities between the fibers of the transformer board are closed by the resin and thereby prevent gas and oil penetration, while the fibers themselves are not impregnated with resin, but instead soak up with oil.
  • the low dielectric constant of the resin used for the impregnation results in similar properties of the mixed dielectric transformer board / resin as transformer board / oil.
  • terminations up to very high voltages can be produced, and optimal solutions can be offered for many dimensions and installation positions without great additional technical outlay.
  • FIG. 1 illustrates the use of a termination 1 produced by the method according to the invention in a transformer 2 with winding 3.
  • the termination the details of which are explained in detail with reference to FIG. 1, is used to connect the winding end 4 to a bushing 5
  • Bushing 5 is carried by a bushing dome 6 which encloses bushing space 7.
  • a further insulating material layer 14 consisting of a transformer board which, however, is not impregnated.
  • a non-impregnated insulating material layer 15 made of transformer board is also provided on the exposed outside of the insulating material layer 11, likewise enveloping the shield electrode 9.
  • a funnel-shaped insulating material layer 16 is provided on the exposed inside of the impregnated insulating material layer 12.
  • a flange ring 17 or 18 is provided in the flange area 13 on the inside and outside.
  • the wall thickness of the funnel-shaped insulating material layer 16 is expediently between 4 and 8 mm.
  • the flange rings 17, 18 can have a thickness between 3 and 8 mm (the latter dimensions apply to a closure with an outer diameter of the flange of 420 mm and a total length of the closure of approximately 400 mm).
  • the part is flooded in a vacuum impregnation kettle (at a temperature below 20 ° C) with a special, low to medium viscosity, oil-resistant resin that cures at low temperature and impregnated for at least 12 hours at normal pressure.
  • a vacuum impregnation kettle at a temperature below 20 ° C
  • a special, low to medium viscosity, oil-resistant resin that cures at low temperature and impregnated for at least 12 hours at normal pressure.
  • the curing takes place in a convection oven at 130 ° C.
  • the impregnated layer consisting of the insulating layers 11 and 12
  • insulating layers 14 and 15 is again formed with a transformer board (insulating layers 14 and 15) to achieve greater mechanical and electrical strength.
  • the funnel-shaped insulating layer 16 is also attached, which is additionally supported by the flange.
  • the flange section is then impregnated with resin in the manner explained above, in order to prevent oil and gas penetration in this area as well.
  • Low- to medium-viscosity resins such as those used for high-voltage insulating parts, for example bushings or switch parts, are suitable as the resin for impregnating the transformer board.
  • Suitable for example, is the cast resin sold by Ciba-Geigy under the type designation CY225 with hardener HY225 (without fillers).
  • CY225 is a modified, solvent-free, medium-viscosity epoxy resin based on bisphenol A at room temperature.
  • terminations can be produced in a wide variety of forms in the sandwich construction explained.
  • 6 to 6 show some variants, for the sake of simplicity only the shield electrode 9a to 9d and the holding element 10a to 10d are shown, without illustrating the individual structure of the holding element from the different layers.
  • the exemplary embodiments according to FIGS. 6 to 6 correspond to the exemplary embodiment according to FIG. 2 in terms of structure and manufacture.
  • zone II there are two resin-impregnated layers of insulating material 11 and 12 made of transformer board one above the other; this is followed by a non-impregnated layer of insulating material 12 made of transformer board.
  • zone 111 there is a sandwich construction in which a resin-impregnated insulating material layer 12 is arranged between an inner insulating material layer 16 and an outer, likewise non-impregnated insulating material layer 14 made of transformer board.
  • the V-shape of the termination shown in FIG. 3 is particularly suitable for voltages up to 110 kV.
  • the short V-shape shown in Fig. 4 is suitable for voltages up to 220 kV.
  • the long U-shape (left, fully extended) or the long V-shape (right, fully extended) shown in FIG. 5 in two variants is suitable for voltages up to 750 kV.
  • the W-shape shown in FIG. 6 can be used up to the highest operating voltages (over 1,000 kV).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Claims (8)

1. Procédé de réalisation d'une obturation étanche au vide et à l'huile en construction de transformateurs, une électrode-écran (9) étant munie d'un élément isolant de fixation (10) obtenu en utilisant du « transformerboard •, caractérisé par la succession suivante d'opérations :
a) l'électrode-écran (9) est enveloppée d'une première couche d'isolant (11) de « transformerboard au moins sur la majeure partie de sa longueur ;
b) ensuite, une seconde couche d'isolant (12) de « transformerboard », dont la forme correspond à celle souhaitée de l'élément de fixation (14), est placée de manière qu'elle recouvre partiellement la première couche d'isolant (11) :
c) après séchage sous vide, les deux couches d'isolant (11, 12) de « transformerboard » sont imprégnées sous vide d'une résine résistant à l'huile, à basse jusqu'à moyenne viscosité et durcissant à basse température :
d) après le durcissement de la résine, la couche imprégnée formée par les deux couches d'isolant (11. 12) est revêtue sur chacun des côtés extérieurs à découvert d'au moins une autre couche d'isolant (14, 15, 16).
2. Procédé selon la revendication 1, caractérisé en ce que, après dépôt d'une couche d'isolant (14, 15, 16) sur chacun des côtés extérieurs à découvert de la couche imprégnée formée par les deux couches d'isolant (11, 12), des anneaux (17, 18) sont placés sur les deux côtés de la partie (13) de l'élément de fixation (10) qui forme bride.
3. Procédé selon la revendication 2, caractérisé en ce qu'après mise en place des anneaux (17,18) sur la bride (13), celle-ci est imprégnée d'une résine résistant à l'huile, à basse jusqu'à moyenne viscosité et durcissant à basse température.
4. Procédé selon la revendication 1, caractérisé en ce que le séchage des première et seconde couches d'isolant (11, 12) de « transformerboard est effectué tout d'abord au four à circulation d'air jusqu'à ce que la stabilité de forme soit atteinte et ensuite un séchage sous vide est effectué de préférence à une température comprise entre 100 et 110 °C.
5. Procédé selon la revendication 1, caractérisé en ce que les deux couches d'isolant (11, 12) de « transformerboard sont immergées sous vide dans de la résine à une température comprise entre 10 et 20 °C et continuent ensuite de subir l'imprégnation pendant au moins 12 heures à pression normale.
6. Procédé selon la revendication 1, caractérisé en ce que le durcissement de la résine est effectué au four à circulation d'air à une température comprise entre 110 et 150 °C, de préférence entre 120 et 140 °C.
7. Procédé selon la revendication 1, caractérisé en ce que comme première et seconde couches d'isolant (11, 12) « transformerboard d'une épaisseur chacune de 3 à 5 mm est utilisé.
8. Procédé selon la revendication 7, caractérisé en ce que comme couche d'isolant additionnelle (16) placée sur le côté intérieur à découvert de la seconde couche d'isolant imprégnée (12) un élément d'isolant de forme en trémie ou annulaire est utilisé dont l'épaisseur est comprise entre 4 et 8 mm.
EP84107720A 1984-07-03 1984-07-03 Procédé de fabrication d'une fermeture étanche au gaz et à l'huile pour une construction de transformateur, et fermeture ainsi réalisée Expired EP0167641B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP84107720A EP0167641B1 (fr) 1984-07-03 1984-07-03 Procédé de fabrication d'une fermeture étanche au gaz et à l'huile pour une construction de transformateur, et fermeture ainsi réalisée
AT84107720T ATE27075T1 (de) 1984-07-03 1984-07-03 Verfahren zur herstellung eines vakuumfesten, oeldichten abschlusses fuer den transformatorbau sowie nach diesem verfahren hergestellter abschluss.
DE8484107720T DE3463585D1 (en) 1984-07-03 1984-07-03 Method of constructing a vacuum tight and oil-tight seal for a transformer structure, and seal made in this way
FR8510183A FR2567313B1 (fr) 1984-07-03 1985-07-03 Procede de realisation d'une obturation etanche au vide et a l'huile en construction de transformateurs ainsi qu'obturateur realise d'apres ce procede

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84107720A EP0167641B1 (fr) 1984-07-03 1984-07-03 Procédé de fabrication d'une fermeture étanche au gaz et à l'huile pour une construction de transformateur, et fermeture ainsi réalisée

Publications (2)

Publication Number Publication Date
EP0167641A1 EP0167641A1 (fr) 1986-01-15
EP0167641B1 true EP0167641B1 (fr) 1987-05-06

Family

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Application Number Title Priority Date Filing Date
EP84107720A Expired EP0167641B1 (fr) 1984-07-03 1984-07-03 Procédé de fabrication d'une fermeture étanche au gaz et à l'huile pour une construction de transformateur, et fermeture ainsi réalisée

Country Status (4)

Country Link
EP (1) EP0167641B1 (fr)
AT (1) ATE27075T1 (fr)
DE (1) DE3463585D1 (fr)
FR (1) FR2567313B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3540637A1 (de) * 1985-11-15 1987-05-21 Transformatoren Union Ag Transformator mit sicherungseinrichtung
DE102008013204A1 (de) * 2008-03-07 2009-09-17 Abb Technology Ag Leiteranschluss an Transformatoren
CN113096925B (zh) * 2021-03-31 2023-03-28 广东电网有限责任公司广州供电局 适用于导杆式套管的电力变压器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1490056A1 (de) * 1957-03-30 1969-07-03 Moser Glaser & Co Ag Verfahren zur Herstellung von Wickelkondensatoren und mit elektrisch leitenden Schichten versehenen Durchfuehrungen
CH387116A (de) * 1961-09-06 1965-01-31 Bbc Brown Boveri & Cie Isolator für druckgasisolierte, vollgekapselte Schaltanlagen
DE1465706A1 (de) * 1963-07-22 1969-06-04 Inst Prueffeld Fuer Elek Sche Hochspannungsdurchfuehrung fuer elektrische Apparate,insbesondere fuer fluessigkeitsarme Transformatoren
US3348180A (en) * 1964-06-18 1967-10-17 Westinghouse Electric Corp Electrical inductive apparatus having a multi-conductor bushing
JPS57120317A (en) * 1981-01-17 1982-07-27 Kansai Electric Power Co Inc:The Connecting structure for electric device to wire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
H. P. MOSER: "TRANSFORMER BOARD", Scientia Electrica, Band 25, Heft 3, Seiten 1-120, Jahrgang 1979 *

Also Published As

Publication number Publication date
DE3463585D1 (en) 1987-06-11
FR2567313B1 (fr) 1987-12-24
EP0167641A1 (fr) 1986-01-15
FR2567313A1 (fr) 1986-01-10
ATE27075T1 (de) 1987-05-15

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