EP0224072B1 - Transformateur équipé d'un dispositif de sécurité - Google Patents

Transformateur équipé d'un dispositif de sécurité Download PDF

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Publication number
EP0224072B1
EP0224072B1 EP86115158A EP86115158A EP0224072B1 EP 0224072 B1 EP0224072 B1 EP 0224072B1 EP 86115158 A EP86115158 A EP 86115158A EP 86115158 A EP86115158 A EP 86115158A EP 0224072 B1 EP0224072 B1 EP 0224072B1
Authority
EP
European Patent Office
Prior art keywords
transformer
safety fuse
voltage bushing
voltage
bushing
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
EP86115158A
Other languages
German (de)
English (en)
Other versions
EP0224072A1 (fr
Inventor
Friedrich Dipl.-Ing. Alber
Gerhard Dipl.-Ing. Altmann
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 AT86115158T priority Critical patent/ATE54773T1/de
Publication of EP0224072A1 publication Critical patent/EP0224072A1/fr
Application granted granted Critical
Publication of EP0224072B1 publication Critical patent/EP0224072B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • H01F27/404—Protective devices specially adapted for fluid filled transformers

Definitions

  • the invention relates to a transformer with a safety device for switching off in the event of electrical faults occurring within an oil-filled transformer tank, with a fuse designed as an I k interrupter between the lower end of a conductor pin assigned to an overvoltage bushing and an associated winding connection point.
  • Faults in the interior of transformers have so far usually been switched off by elements arranged outside the transformer, such as fuses in combination with a disconnector. These elements are air-cooled and, after long-term exposure to multiple times the nominal current, can lose their breaking capacity in whole or in part due to overheating. In the worst case, these fuses can even explode when triggered.
  • I k -interrupters there, have a defined characteristic curve, are suitable for installation under oil and are matched so that they only respond selectively to internal transformer faults. In the case of such internal faults, it can happen that an arc arising in the winding area can gain a foothold in the area in front of the fuse in the course of the energy flow direction, so that the full mains short-circuit power is implemented in the transformer tank bypassing the built-in fuse.
  • the invention is therefore based on the object to arrange and install these special type of fuses in the oil-filled transformer to be protected in such a way that short-circuit arcs of high power are reliably excluded when internal faults occur within the transformer tank.
  • this object is achieved in a transformer of the type mentioned in that the distance between the lower end of the high voltage bushing and the upper end of the fuse is less than half the length of the fuse and that the conductor section between the lower end of the high voltage bushing and the fuse arc foot point-free.
  • this conductor section is encased by appropriate pieces of shrink tubing.
  • the fuse has a shield made of insulating material that opens towards the high-voltage bushing.
  • a protective device is already known from US Pat. No. 3,474,374, which is arranged movably in a holder made of insulating material in the interior of a transformer tank.
  • part of the holder is funnel-shaped.
  • this funnel-shaped part does nothing to suppress possible arcing. Rather, all unprotected parts of the known arrangement are covered with insulating material to suppress arcs within the transformer tank.
  • the high-voltage bushing is designed as a plug-in bushing and that, in addition, between bare-side fuses and undervoltage bushings arranged outside the transformer tank, all bare surface sections of the components that carry the undervoltage are covered by insulating layers.
  • Screw bolts 2 are fastened, for example by welding, to a boiler cover of a transformer, which is shown as a detail, with a cover wall 1. These bolts 2 pass through a metal flange 3 of a high-voltage bushing, which is pressed against the cover wall 1 by washers 4 and nuts 5 and clamps a sealing ring 6.
  • the metal flange 3 carries in casting grooves 7 an upper cast resin sleeve 8 and a lower cast resin sleeve 9 and on the inner wall of a central opening a sealing ring 10 made of permanently elastic plastic.
  • the cast resin sleeves 8 and 9 together with the sealing ring 10 form a straight shaft with a circular cross section for receiving an insertable conductor pin 11.
  • the upper cast resin sleeve 8 is provided in the usual way with a bead 12 to extend the creepage distance.
  • the lower end of the conductor pin 11 is galvanic with the upper end of a fuse box tion 13 is connected, the lower end of which is in turn galvanically connected to a winding lead 14.
  • the melting drawing 13 is designed as a so-called I k interrupter and is suitable for installation in an oil volume. The installation of the I k interrupter in the oil volume results in a very good and even cooling of the same in addition to the insulation, thereby increasing its operational safety, especially when exposed to long-term currents above the nominal current.
  • the fuse is tuned so that it only responds selectively to electrical faults on or in the active part, i.e. inside the transformer.
  • the distance between the lower cast resin sleeve 9 and the fuse 13 is less than half its length, so that a screen 16 carried by this part of the fuse 13 via a sleeve 15 at least the point of exit of the conductor pin 11 from the cast resin sleeve 9 against the free space below shields the top wall 1.
  • the sleeve 15 and the screen 16 are made of insulating material and therefore have a relatively high thermal resistance. For this reason, in order to improve the dissipation of heat from the melt drawing 13, it is advantageous to arrange a fuse wire (not shown) held therein, entirely or substantially below the sleeve 15.
  • the shield 16 made of insulating material reliably prevents an arc rising from the active part of the transformer (not shown in more detail) from finding a base on the part of the conductor pin 11 located in front of the fuse 13. In the event that parts of the conductor pin 11 or connected to it bare metallic parts for design or other reasons can not be fully covered by the screen 16, these parts are covered in a manner not shown with insulating layers, for example in shrink tube technology.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Fuses (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Discharge Heating (AREA)

Claims (6)

1. Transformateur comportant un dispositif de sécurité pour réaliser le débranchement dans le cas de défauts électriques apparaissant à l'intérieur d'une cuve remplie d'huile, du transformateur, par exemple dans le cas de courts-circuits apparaissant au niveau des enroulements, et comportant un coupe-circuit à fusible (13), réalisé sous la forme d'un interrupteur de courant Ik et disposé entre l'extrémité inférieure d'une broche de conducteur (11) associée à une traversée pour la haute tension et un point associé de raccordement de l'enroulement,
caractérisé par le fait
- que la distance entre l'extrémité inférieure de la traversée pour la haute tension et l'extrémité supérieure du coupe-circuit à fusible (13) est inférieure à la moitié de la longueur du coupe-circuit à fusible (13), et
- que la section de conducteur entre l'extrémité inférieure de la traversée pour la haute tension et le coupe-circuit à fusible (13) est réalisée de manière à ne pas former un point de départ pour un arc électrique, du fait que
- cette section de conducteur est enveloppée par des morceaux correspondants de tuyaux emmanchés par frettage, et
- le coupe-circuit à fusible (13) possède un écran de protection en matériau isolant (16), qui s'ouvre en direction de la traversée pour la haute tension.
2. Transformateur suivant la revendication 1, caractérisé par le fait que la traversée pour la haute tension est réalisée sous la forme d'une traversée à enfichage.
3. Transformateur suivant la revendication 1 ou 2, caractérisé par le fait qu'en outre, entre des coupe-circuits côté basse tension et des traversées pour la basse tension, prévus à l'extérieur de la cuve du transformateur, tous les éléments de surface nus de composants véhiculant la basse tension sont également recouverts par des couches isolantes.
4. Transformateur suivant l'une des revendications 1 à 3, caractérisé par le fait qu'à l'intérieur du coupe-circuit à fusible (13), le fil fusible proprement dit est disposé entièrement au-dessous d'un manchon (15) portant l'écran de protection (16).
5. Transformateur suivant l'une des revendications 1 à 4, caractérisé par le fait que l'écran de protection (16) forme une enveloppe conique ou une coupelle, ouverte vers le haut et entourant le point intérieur de raccordement de la traversée pour la haute tension.
6. Transformateur suivant l'une des revendications 1 à 5, caractérisé par le fait que la traversée pour la haute tension est fixée sur le bord supérieur d'une paroi longitudinale de la cuve du transformateur.
EP86115158A 1985-11-15 1986-10-31 Transformateur équipé d'un dispositif de sécurité Expired - Lifetime EP0224072B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115158T ATE54773T1 (de) 1985-11-15 1986-10-31 Transformator mit sicherungseinrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3540637 1985-11-15
DE19853540637 DE3540637A1 (de) 1985-11-15 1985-11-15 Transformator mit sicherungseinrichtung

Publications (2)

Publication Number Publication Date
EP0224072A1 EP0224072A1 (fr) 1987-06-03
EP0224072B1 true EP0224072B1 (fr) 1990-07-18

Family

ID=6286123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115158A Expired - Lifetime EP0224072B1 (fr) 1985-11-15 1986-10-31 Transformateur équipé d'un dispositif de sécurité

Country Status (5)

Country Link
EP (1) EP0224072B1 (fr)
AT (1) ATE54773T1 (fr)
BR (1) BR8605622A (fr)
DE (2) DE3540637A1 (fr)
PT (1) PT83738B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE93081T1 (de) * 1989-02-20 1993-08-15 Siemens Ag Hochspannungsdurchfuehrung fuer oelgekuehlte elektrische geraete.
FR2719150B1 (fr) * 1994-04-21 1996-06-07 Pioch Sa Passe-tige, notamment pour transformateur.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE827668C (de) * 1948-10-02 1952-01-10 Siemens Schuckertwerke A G Hochspannungsoelklemme fuer elektrische Geraete
US3474374A (en) * 1966-09-19 1969-10-21 Westinghouse Electric Corp Protective link for a transformer or such like device enclosed within a tank
US3710002A (en) * 1971-06-09 1973-01-09 E Link An under-ground vented non-metallic transformer assembly
DE2623156B2 (de) * 1976-05-22 1980-05-22 Transformatoren Union Ag, 7000 Stuttgart Elektrische Durchführung mit Gieliharzstützer und Metallbefestigungsflansch
FR2545641A1 (fr) * 1983-05-04 1984-11-09 Pioch Rene Passe-barre a barre flottante destine aux sorties de transformateur
FR2553592B1 (fr) * 1983-10-18 1985-12-27 Cables De Lyon Geoffroy Delore Montage d'extremite pour cable electrique haute tension
EP0167641B1 (fr) * 1984-07-03 1987-05-06 H. Weidmann AG Procédé de fabrication d'une fermeture étanche au gaz et à l'huile pour une construction de transformateur, et fermeture ainsi réalisée

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Elektrizitätswirtschaft, 83 Jahrgang (1984), Seiten 318-321 *

Also Published As

Publication number Publication date
EP0224072A1 (fr) 1987-06-03
DE3672767D1 (de) 1990-08-23
BR8605622A (pt) 1987-08-18
ATE54773T1 (de) 1990-08-15
PT83738B (pt) 1993-01-29
PT83738A (de) 1986-12-01
DE3540637A1 (de) 1987-05-21

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