EP0945879A1 - Integrale Wellplatte für eingetauchten elektrischen Transformatorkessel - Google Patents

Integrale Wellplatte für eingetauchten elektrischen Transformatorkessel Download PDF

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Publication number
EP0945879A1
EP0945879A1 EP99105531A EP99105531A EP0945879A1 EP 0945879 A1 EP0945879 A1 EP 0945879A1 EP 99105531 A EP99105531 A EP 99105531A EP 99105531 A EP99105531 A EP 99105531A EP 0945879 A1 EP0945879 A1 EP 0945879A1
Authority
EP
European Patent Office
Prior art keywords
wave
tank
panel
integral
panels
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.)
Withdrawn
Application number
EP99105531A
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English (en)
French (fr)
Inventor
Alain Ochs
Raymond Idda
Pierre Lickindorf
Robert Preaux
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.)
France Transfo SAS
Original Assignee
France Transfo SAS
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 France Transfo SAS filed Critical France Transfo SAS
Publication of EP0945879A1 publication Critical patent/EP0945879A1/de
Withdrawn legal-status Critical Current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
    • H01F27/025—Constructional details relating to cooling

Definitions

  • the present invention relates to tanks for submerged electrical transformers girdles of wavy panels around their entire perimeter. More specifically, the invention relates to the production of such panels and their assembly to form a wavy belt tank.
  • an immersed electrical transformer is a transformer whose electrical part (mainly primary and secondary windings and their circuit associated magnetic) is cooled by immersion in a dielectric liquid, an oil mineral in general, contained in a watertight metal tank whose side walls, provided with hollow fins called "waves", serve as heat exchanger with the medium outside to maintain the transformer at nominal temperature operation.
  • a corrugated panel of the type considered is generally made in one piece and in a single sequence of operations, from a metal strip (usually in steel) which is deformed at regular intervals to form parallel and deep folds. The two faces of each fold are pinched on their edges, which are closed by welding waterproof to form a wave.
  • a corrugated panel is thus an essential component of the tank submerged transformer consisting of a succession of parallel waves which, once mounted on the tank, become hollow cooling fins opening onto the internal volume of the tank containing the dielectric liquid.
  • the mounting method consists schematically of first lining two sides opposite of the tank with a corrugated panel projecting on either side of the lateral limits of a tank of a distance corresponding to the height of the waves of the wavy panels in front equip the other sides of the tank. These second wavy panels are then placed in the space defined between the projecting end portions of the already installed corrugated panels. The four panels thus butt-joined are sealed together by continuous welding of their opposite ends. Special precautions are taken at the junctions to that the waves present on the overhanging terminal parts can be supplied with dielectric liquid by communication of their interior volume with the last wave of the adjacent panel mounted opposite at right angles.
  • FIG. 1 presented on the drawing boards attached to this memory, shows schematically seen from above such an assembly of two pairs of wavy panels (3a, 3b), and (4a, 4b) mounted end to end at right angles and on which the waves mothers 9 appear clearly visible in voluntarily split lines.
  • the tank 1 houses a transformer 2 immersed in a liquid dielectric 5.
  • Waves 9 to the end of the "second" panels 4a and 4b constitute the mother waves communicating with the daughter waves 8 forming the protruding end portions 6 of the "first" panels 3a and 3b.
  • the other waves 7 of said panels are themselves in direct communication with the interior volume of the tank, like the waves of the panels 4a and 4b.
  • the object of the present invention is to solve these drawbacks.
  • the invention relates to an integral wave belt for tanks submerged electrical transformers formed by tightly welded assembly of panels wavy mounted one after the other at right angles, characterized in that each panel extends on one side only from the tank boundaries so that the part terminal projecting from one is placed opposite the outside face of the last wave at the edge of the tank of the adjacent corrugated panel, in an assembly reminiscent of that of the parts of a set of dominoes, and in that means are provided on said last wave for the put in communication with the waves of said projecting terminal part.
  • these means of communication consist of a transverse opening formed on the outer face of said last wave, according to the height thereof.
  • such transverse openings are made at neighborhood of each upper and lower end of the wave.
  • the invention also relates to a corrugated panel constituting such a belt integral characterized in that it has at one of its ends a last wave whose outer face has at least one transverse opening, preferably two, stepped along the length of the wave, and arranged in the vicinity of the ends of the wave.
  • the inner enclosure 20 tank contains an electrical transformer 2 immersed in a dielectric liquid 5.
  • the tank is generally rectangular in shape and its periphery is constituted by a belt integral wavy 14 according to the invention, formed by sealed welded assembly of four wavy panels mounted at right angles one after the other, according to an architecture a set reminiscent of an assembly of pieces of the domino game.
  • Each panel wavy 10, 11, 12, 13, the assembly of which forms this integral wavy belt 14, is made up a strip of steel 21 folded at regular intervals to form a succession of waves 15 distributed over the length of the side of the tank on which it is mounted.
  • Each wavy panel is mounted so as to present one and only one end portion 16 projecting from the limits of the vessel enclosure 20, the other end 17 being placed in the extension of this enclosure.
  • this end wave 17 constitutes a mother wave with respect to waves 18, called "daughter waves", forming the terminal part overflowing 16 from the adjacent panel 10.
  • the sealed assembly between two panels adjacent, such as 10 and 11, is provided by a weld bead 19 connecting by their edge the wave mother 17 of panel 11 and the steel strip 21 of the overhanging end part 16 of the panel 10.
  • a fold 22 of reduced height can advantageously be provided during the shaping of the metal strip 21 at the end of the projecting part 16 of the panels wavy, that is to say on the end of the panel opposite to that receiving the mother wave 17.
  • the purpose of this provision is above all to constitute a radiation protection screen the outermost daughter wave 18, therefore the most exposed, of the wavy panels with respect to the thermal radiation produced by the operation of welding the panels together during the assembly of the wavy belt 14.
  • this assembly operation consists at first, as is usually the case, to arrange the first panel 10 on one side of the tank 1 and to fix it to the upper 29 and lower frames (not visible) of the tank by sealed welding 25 of its upper and lower edges. Then we put in place on the adjacent side of the tank, the second wavy panel 11 by applying flat sound end wave 17 (mother wave) against the bare interior surface of the terminal part protruding 16 from the panel 10 in order to cover it. We then assemble the two panels 10 and 11 by leaktight welding 19 of the lateral and longitudinal edges of the projecting part 16, then the upper edge is welded to the chassis 29 with a waterproof cord 26, and even for the bottom edge.
  • flat sound end wave 17 mother wave
  • the length of the projecting end portion 16 will be preference chosen according to the height of the waves 15 of the adjacent panel 11 of so that the free edge 23 of the panel 10 is set back on the external face 24 of the wave mother 17 to facilitate the formation of the sealed weld bead 19 connecting the panels 10 and 11 between them.
  • fold 22 at the end of the projecting part 16, which is intended to form a heat shield protecting the wave closest daughter 18 of the arc's radiation when performing the game longitudinal (the longest in fact) of the weld bead 19.
  • the wavy panel 12 (fig. 2) abuts at a right angle against the end projecting from the panel 11 (not visible in fig. 3) in the same way as what comes to be described for the junction of panels 10 and 11. We then do the same for what relates to the panels 12 and 13. Then, the assembly of the wavy belt 14 is completed in joining the mother wave 17 from the free end of the panel 10 to the terminal part projecting from the panel 13.
  • the communication of the dielectric liquid 5 inside the tank 1 with the internal volume of the daughter waves 18 is, in accordance with the invention, by through their mother wave 17 provided for this purpose with appropriate means.
  • this connection is simply obtained using an opening 27 cut from the sheet 21 of the face external 24 of the mother wave 17 against which the terminal part 16 is applied.
  • this opening 27 is made transversely along the height of the wave 17 so as to intercept all the daughter waves 18 and thus constitute a passage between the interior of each of them and the interior volume of the mother wave 17, which is by construction naturally placed in communication with the interior volume of the tank receiving the submerged transformer 2.
  • two openings will be made 27 and 27 ′, stepped along the length of the mother wave 17, one in the vicinity of its high edge, the other near the bottom edge. This arrangement will allow better circulation of dielectric liquid by thermosiphon.
  • punches 28 in full face on the mother wave 17, as on all the other waves elsewhere.
  • These punches have a double function: of stiffeners first to contribute to good mechanical strength of the wavy belt in its together, and also spacer in order to impose a desired spacing between the two sides of the same wave to save the interior volume intended to be occupied by dielectric liquid. They are printed on the metal strip constituting a corrugated panel after folding it and before welding the edges.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
EP99105531A 1998-03-25 1999-03-18 Integrale Wellplatte für eingetauchten elektrischen Transformatorkessel Withdrawn EP0945879A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9803797A FR2776822B1 (fr) 1998-03-25 1998-03-25 Ceinture ondee integrale pour cuve de transformateur electrique immerge
FR9803797 1998-03-25

Publications (1)

Publication Number Publication Date
EP0945879A1 true EP0945879A1 (de) 1999-09-29

Family

ID=9524563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99105531A Withdrawn EP0945879A1 (de) 1998-03-25 1999-03-18 Integrale Wellplatte für eingetauchten elektrischen Transformatorkessel

Country Status (2)

Country Link
EP (1) EP0945879A1 (de)
FR (1) FR2776822B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133523A (en) * 1983-01-07 1984-07-25 Hitachi Ltd Tank for oil-filled electric equipment
DE3627180A1 (de) * 1986-08-11 1988-02-18 Transformatoren Union Ag Transformator mit fluessigkeitskuehlung
FR2697667A1 (fr) * 1992-11-03 1994-05-06 France Transfo Sa Panneau ondé de cuve de transformateur électrique immergé, son procédé de réalisation, et son application au montage d'une cuve.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133523A (en) * 1983-01-07 1984-07-25 Hitachi Ltd Tank for oil-filled electric equipment
DE3627180A1 (de) * 1986-08-11 1988-02-18 Transformatoren Union Ag Transformator mit fluessigkeitskuehlung
FR2697667A1 (fr) * 1992-11-03 1994-05-06 France Transfo Sa Panneau ondé de cuve de transformateur électrique immergé, son procédé de réalisation, et son application au montage d'une cuve.

Also Published As

Publication number Publication date
FR2776822B1 (fr) 2000-06-09
FR2776822A1 (fr) 1999-10-01

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