EP0859382B1 - Gasisolierter Transformator - Google Patents

Gasisolierter Transformator Download PDF

Info

Publication number
EP0859382B1
EP0859382B1 EP98200142A EP98200142A EP0859382B1 EP 0859382 B1 EP0859382 B1 EP 0859382B1 EP 98200142 A EP98200142 A EP 98200142A EP 98200142 A EP98200142 A EP 98200142A EP 0859382 B1 EP0859382 B1 EP 0859382B1
Authority
EP
European Patent Office
Prior art keywords
transformer
casing
cover
disc
gas
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
EP98200142A
Other languages
English (en)
French (fr)
Other versions
EP0859382A3 (de
EP0859382A2 (de
Inventor
Rafael Raga Lleida
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.)
Itron Soluciones de Medida Espana SA
Schlumberger SA
Original Assignee
Itron Soluciones de Medida Espana SA
Schlumberger SA
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 Itron Soluciones de Medida Espana SA, Schlumberger SA filed Critical Itron Soluciones de Medida Espana SA
Publication of EP0859382A2 publication Critical patent/EP0859382A2/de
Publication of EP0859382A3 publication Critical patent/EP0859382A3/de
Application granted granted Critical
Publication of EP0859382B1 publication Critical patent/EP0859382B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means

Definitions

  • the present invention relates to a gas-insulated transformer comprising a magnetic core associated with primary and secondary windings, the magnetic core and the primary and secondary windings being contained in a housing mounted around part or all of the transformer core and molded inside a resin case.
  • transformers are conventional elements in high or medium voltage lines of an electricity distribution network and use an inert gas, such as silicon hexafluoride (SF 6 ) to provide thermal and electrical insulation.
  • an inert gas such as silicon hexafluoride (SF 6 ) to provide thermal and electrical insulation.
  • the gas is pumped inside the interior envelope of the resin case, either directly inside the spaces located between the layers of the transformer winding, or where a case in plastic material is mounted around the core and the windings before they are immersed in the resin, inside the plastic housing.
  • a recess is formed in the mold so as to provide a channel leading to the inner envelope of the transformer containing the core and the windings or, if present, the plastic casing.
  • a simple carbon disc is then adjusted in this recess and held in place by the injection of a resin carried out during a second molding phase.
  • safety plugs generally include a carbon disc held in place between two pieces of a steel plug body, the pieces of the plug body engaging with each other via a threaded joint. .
  • the external body of the plug is itself threaded so that it can be screwed in place during use.
  • the present invention therefore aims to remedy the drawbacks associated with the prior art and to provide a transformer model using a safety element allowing the expulsion of gas in the event of overpressure inside the transformer, but which avoids the need for a second molding phase to keep the element in place, and which is less expensive than the conventional safety plugs available commercially and described above.
  • the transformer of the present invention is characterized in that it comprises a rupture disc held in place directly between the housing and the cover, the cover being fixed to the housing and forming a channel between the rupture disc and the outside of the housing.
  • the presence of a single cover designed specifically engaging directly on the housing surrounding the transformer core avoids the problem of duplication of elements and high price, due to the use of standardized safety caps. commercially available.
  • the invention also makes it possible to reduce the number of other elements involved in the design, as will be described below.
  • the cover and the housing are joined to each other by means of a threaded joint.
  • a threaded joint is also possible, for example in which the cover is joined to the housing by means of a adhesive, but the use of a threaded joint has the advantage of leading to a secure joint, while avoiding the need to use other materials in construction.
  • a single sealing ring is disposed between the rupture disc and the cover part.
  • commercially available safety caps are normally used with a pair of sealing rings, a first inner ring in the cap, at the position of the disc, inside the cap, and a second ring located outside the plug, at the point of contact between the plug and the transformer.
  • only one sealing ring is needed to ensure that the seal is gas tight while protecting the disc against rupture by compression of the cover. against the housing.
  • the cover portion has substantially the shape of a cap provided with one or more openings to allow the escape of gas in the event of rupture of the disc.
  • the housing surrounding the transformer covers practically the entire core and windings of the transformer.
  • the housing may include a single element covering only the part of the transformer that is needed to form a channel from the core and the windings of the transformer to the rupture disc.
  • the rupture disc is formed of carbon, while the housing and the cover portion are formed of plastic and metal, respectively.
  • FIG. 1 there is shown a safety valve structure of the prior art intended for a transformer which comprises a conical recess 1 formed in the resin mold 2, constituting a channel between the windings of transformer 3 and the atmosphere.
  • a carbon disc 4 is sealed inside the recess, against the windings 3 of the transformer.
  • a second molding step was carried out and led to the formation of a second layer of resin 5 making it possible to fix the disc in position.
  • the insulating gas is pumped inside the mold and the transformer windings.
  • this form of device suffers from the drawback that a two-stage molding operation is necessary to fix the disc in position. Furthermore, as can be seen from the Figure 1, this particular structure suffers from the drawback that the disc is exposed to the outside and can be pierced, for example by intrusion of external objects.
  • FIG. 2 this illustrates a device forming a safety valve in a transformer according to an embodiment of the invention, which comprises a rupture disc 10 made of carbon engaged on a plastic housing 11 surrounding the core and the transformer windings (not shown) and held in position by a part 12 forming a steel cover which rests on the rupture disc by means of an O-ring 13 d ' sealing made of rubber or plastic.
  • the assembly is held inside the resin case 14 of the transformer 15.
  • the housing 11 has an opening 16 over which the rupture disc 10 is sealed in place, in association with a cylindrical part 17 projecting from the surface of the housing.
  • the internal surface of the cylindrical part 17 is threaded so as to receive an external surface threaded in the same way of the part forming the cover 12 to form a threaded joint 18.
  • a threaded joint is preferable for several reasons, including ease of assembly and mechanical safety.
  • the surfaces in mutual contact of the housing and the cover part can be smooth and the joint formed between them can be fixed by means of an adhesive.
  • the part forming the cover 12 has the form of a cap provided with a number of openings 19 around its periphery.
  • the outermost face 20 of the cover has an uninterrupted protective surface for the user.
  • the housing 11 is fixed around the core and the windings of the transformer, of the disc 10 and of the sealing ring 13 which is then placed inside the cylindrical part 17 of the housing and is held in place. place by screwing the part forming the cover 12 in position in the housing.
  • the assembly is then placed in the mold and resin is poured around it. Once the resin has hardened, insulating gas is pumped inside the transformer by means of a plastic tube (not shown) connecting the interior envelope of the mold to the exterior.
  • the carbon disc 10 ruptures and allows the gas to escape to the atmosphere via the pipe formed by the housing 11 and the cover 12 and through the openings 19.
  • FIG. 3 A cross-sectional view of a transformer 15 according to an embodiment is shown in Figure 3, in which the housing 11 completely surrounds the core and the annular windings 22 of the transformer.
  • the housing is formed of two halves which are pinched around the ring forming the transformer and are sealed in place. The sealed assembly is then placed in the resin mold.
  • the housing can be fixed around only part of the circumference of the transformer ring or, as illustrated in Figure 4, only on the surface of the windings which is close to the safety valve.
  • the core and the windings 24 of the transformer are directly molded in the resin, the insulating gas being contained inside the interstitial spaces between the windings, and the housing 23 is arranged so as to form a channel with the carbon disc 10 and the cover forming part 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Circuit Breakers (AREA)
  • Regulation Of General Use Transformers (AREA)

Claims (7)

  1. Gasisolierter Transformator (15), einen magnetischen Kern in Verbindung mit Primär- und Sekundärwicklungen in einem Gehäuse (11) oder in Kontakt mit diesem aufweisend, wobei dieses Gehäuse um einen Teil oder den gesamten Kern und die Wicklungen justiert ist und im Innern des Gehäuses in Harz (14) geformt, und dadurch gekennzeichnet, dass er eine Berstscheibe (10) aufweist, die direkt über dem Gehäuse (11) am Platz gehalten wird, und ein Element, das eine Haube (12) bildet, wobei das die Haube (12) bildende Element am Gehäuse (11) befestigt ist und einen Kanal zwischen der Berstscheibe (10) und der Außenseite des Gehäuses bildet.
  2. Gasisolierter Transformator nach Anspruch 1, wobei das die Haube (12) bildende Element und das Gehäuse (11) miteinander mittels einer Gewindedichtung verbunden sind.
  3. Gasisolierter Transformator nach Anspruch 1 oder 2, wobei zwischen der Berstscheibe und dem die Haube bildenden Teil ein Dichtring (13) vorgesehen ist.
  4. Gasisolierter Transformator nach einem der vorhergehenden Ansprüche, wobei der die Haube (12) ausbildende Teil etwa wie eine Kappe geformt ist, die eine oder mehrere Öffnungen (19) aufweist, durch die das Gas austreten kann, falls die Scheibe bersten sollte.
  5. Gasisolierter Transformator nach einem der vorhergehenden Ansprüche, wobei das Gehäuse (11) die Gesamtheit des Kerns und der Wicklungen des Transformators etwa umschließt.
  6. Gasisolierter Transformator nach einem der Ansprüche 1 bis 4, wobei das Gehäuse ein einziges Element umfasst, das nur einen Teil des Transformators umschließt, der zur Ausbildung eines Kanals, der vom Kern und den Wicklungen des Transformators bis zur Berstscheibe reicht, notwendig ist.
  7. Gasisolierter Transformator nach einem der vorhergehenden Ansprüche, wobei die Berstscheibe aus Karbon besteht.
EP98200142A 1997-02-10 1998-01-20 Gasisolierter Transformator Expired - Lifetime EP0859382B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9700260 1997-02-10
ES09700260A ES2119720B1 (es) 1997-02-10 1997-02-10 Transformador aislado por gas

Publications (3)

Publication Number Publication Date
EP0859382A2 EP0859382A2 (de) 1998-08-19
EP0859382A3 EP0859382A3 (de) 1998-11-18
EP0859382B1 true EP0859382B1 (de) 2004-03-31

Family

ID=8298174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98200142A Expired - Lifetime EP0859382B1 (de) 1997-02-10 1998-01-20 Gasisolierter Transformator

Country Status (5)

Country Link
EP (1) EP0859382B1 (de)
AT (1) ATE263420T1 (de)
DE (1) DE69822690T2 (de)
ES (2) ES2119720B1 (de)
PT (1) PT859382E (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH214999A (de) * 1940-01-13 1941-05-31 Bbc Brown Boveri & Cie Druckluftisolierter, elektrischer Apparat.
US4168723A (en) * 1977-11-18 1979-09-25 Chicago Pneumatic Tool Company Pressure relief valve
CA1207213A (en) * 1982-05-19 1986-07-08 Wendell D. Johnson Dual valve pressure relief device
EP0191694A1 (de) * 1985-02-08 1986-08-20 Schlumberger Canada Limited Hochspannungstransformator und Verfahren zur Herstellung
JPH027817A (ja) * 1988-06-15 1990-01-11 Fuji Electric Co Ltd ガス絶縁開閉装置のガス封入容器
DE3840239A1 (de) * 1988-11-29 1990-05-31 Elef Svenska Elverkens Ekonomi Gekapselte umspannstation

Also Published As

Publication number Publication date
EP0859382A3 (de) 1998-11-18
EP0859382A2 (de) 1998-08-19
ES2221113T3 (es) 2004-12-16
ES2119720A1 (es) 1998-10-01
ATE263420T1 (de) 2004-04-15
DE69822690T2 (de) 2005-03-17
DE69822690D1 (de) 2004-05-06
PT859382E (pt) 2004-08-31
ES2119720B1 (es) 1999-05-01

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