EP0412479B1 - Medium voltage switch - Google Patents

Medium voltage switch Download PDF

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Publication number
EP0412479B1
EP0412479B1 EP90115069A EP90115069A EP0412479B1 EP 0412479 B1 EP0412479 B1 EP 0412479B1 EP 90115069 A EP90115069 A EP 90115069A EP 90115069 A EP90115069 A EP 90115069A EP 0412479 B1 EP0412479 B1 EP 0412479B1
Authority
EP
European Patent Office
Prior art keywords
contact
contacts
circuit breaker
moving
fixed
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
EP90115069A
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German (de)
French (fr)
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EP0412479A1 (en
Inventor
Michel Perret
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.)
Alstom Holdings SA
Original Assignee
GEC Alsthom SA
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Publication of EP0412479A1 publication Critical patent/EP0412479A1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/365—Bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H33/6661—Combination with other type of switch, e.g. for load break switches

Definitions

  • the present invention relates to a medium-voltage circuit breaker, in which the electrical insulation is ensured by a gas with good dielectric properties such as sulfur hexafluoride SF6.
  • the invention relates more particularly to a circuit breaker in which a current of high intensity (several thousand amperes) flows.
  • This type of circuit breaker is found in power plants, at the output of the alternator and upstream of the electrical voltage transformer.
  • the document EP 0 011 542 describes a medium-voltage switching device comprising an envelope made of insulating material filled with gases having good dielectric properties, first contacts connected to a first socket and second contacts connected to a second socket, a fixed arcing contact connected to the first socket and a movable arcing contact connected to an operating member, and a permanent movable contact establishing, when the circuit breaker is in the engaged position, a connection between the first and second contacts .
  • the permanent movable contact through which the permanent current passes, is most often a copper tube of relatively high mass which, when tripped, is driven with the arcing contact, at high speed. .
  • the energy necessary for this maneuver is important since it is proportional to the product of the mass of the moving assembly by the square of the speed of movement of this crew. All manufacturers seek to reduce this operating energy, because its importance penalizes the cost price of the control of the switching device.
  • a first object of the invention is to provide a circuit breaker in which the mass of the movable assembly is reduced, so as to correlatively reduce the energy required for the tripping operation.
  • Another object of the invention is to develop a circuit breaker in which the permanent current does not pass through sliding contacts, so that savings are made on the price of the device.
  • circuit breaker as defined in claim 1 attached.
  • secondary claims as regards examples of preferred embodiments, reference is made to the secondary claims.
  • the reference 1 designates an insulating, leaktight envelope, preferably cylindrical, provided with a bottom 1A and filled with a gas with good dielectric properties such as sulfur hexafluoride SF6, under a pressure of 1 to several bars.
  • a gas with good dielectric properties such as sulfur hexafluoride SF6, under a pressure of 1 to several bars.
  • a first socket 2 connected upstream in the circuit to be protected, crosses the casing 1 in a sealed manner by means of a seal 3; the socket 2 extends inside the envelope, on the one hand by a ring of fingers 4, on the other hand by a contact 5 arranged along the geometric axis 6 of the envelope.
  • the fingers 4 are arranged in the vicinity of the wall of the envelope, parallel to the axis 6, and occupy an arc of a circle of approximately 120 degrees, the plane of this circle being perpendicular to the axis 6.
  • Contact 5 is a metal rod terminated by an end 5A of an alloy resistant to the effects of an electric arc, for example a tungsten-based alloy.
  • a second socket 10 connected downstream in the circuit to be protected, crosses the envelope in a sealed manner thanks to a seal 11, and is extended inside the envelope 1 by a cylindrical portion 12 carrying studs contact 13 arranged in an arc a ′ whose plane is perpendicular to the axis 6, so that the studs 13 are opposite the ends of the fingers 4.
  • the circular arc a ′ according to which the studs 13 are arranged is preferably of the same length as the arc has the fingers 4 and we will see further how to determine an upper limit of its length.
  • the fixed assembly of the circuit breaker is completed by a blowing cylinder 14, made of insulating material, coaxial with the axis 6, fixed to the wall by lugs 15, and the bottom 16 of which has an opening for the passage of an element of the moving crew.
  • the mobile assembly comprises a metal tube 20, engaging in the aforementioned opening of the bottom 16 and fixed, by a first end, to an operating rod 21 made of insulating material.
  • the connecting rod 21 is articulated to a crank 22 rotated by a shaft 23 which passes through the wall 1 and which is connected outside of this envelope to an operating device, not shown.
  • the second end of the tube 20 carries a ring of contact fingers 25 constituting the movable arcing contact and cooperating with the fixed arcing contact 5.
  • the tube 20 carries a blowing piston 26 sliding inside the blowing cylinder 14 and provided with calibrated openings 27.
  • blowing nozzle 28 made of insulating material such as polytetrafluoroethylene known under the registered trademark Teflon.
  • the permanent movable contact consists of a copper tube 30, of diameter chosen to cooperate, when the circuit breaker is in the engaged position (FIGS. 1 and 2), with the fingers 4 and the studs 13.
  • This tube 30 is made integral with the tube 20 by metal arms 31; a metal braid 32 connects an arm 31 to the upstream socket 10-12.
  • the circuit breaker works as follows: in the engaged position, the current flows through the upstream outlet 2, the fingers 4, the tube 30, the fingers 13 and the downstream outlet 10.
  • the control produces a rotational movement at the shaft 23, which is transformed by the crank 22 and the connecting rod 21 into a translational movement of the tube 20 towards the bottom of FIG. 1.
  • the contact 30 leaves the fingers 4 and the studs 13 and the current then switches on the rod 5 and the fingers 25; the movement continuing, the fingers 25 leave the rod 5 and an arc 40 lights up (FIG. 3).
  • the gas from cylinder 14 is compressed, escapes through the openings 27 and passes through the nozzle 28, blowing out the arc which extinguishes on the first zero current crossing.
  • the moving assembly is very light and requires, all other things being equal, only a reduced operating energy. It is also observed that the permanent current crosses only one set of contacts, the design of the device allowing the absence of any sliding contact.
  • Arc a and arc a ′ are chosen to ensure voltage withstand when the circuit breaker is in the tripped position.
  • a minimum isolation distance 1 between the end fingers 4 and the studs 13 at the ends must be respected (FIG. 2).
  • a minimum isolation distance must be maintained between the piston 26 or the tube 30, at the potential of the downstream outlet, and the fingers 4 at the potential of the upstream outlet.
  • the braid 32 is used for the passage of the current only during the operation of the circuit breaker, when the tube 30 has left the pads 4 and 13; the current then passes by elements 5A, 25, 20, 31 and the braid 32 connected to the socket 10.
  • the invention finds application in the production of circuit breakers with a nominal voltage less than or equal to 45 kV, and in particular, plant circuit breakers.

Abstract

The invention relates to a medium voltage contact breaker. <??>The subject is a medium voltage contact breaker comprising an envelope (1) in insulating material occupied by a gas with good dielectric properties, and inside which envelope are arranged:   - first contacts (4) connected to a first current intake (2) and second contacts (13) connected to a second current intake (10),   - a fixed arc contact (5) connected electrically to the said first current intake and a moving arc contact (25) fixed to a link-rod (21) mechanically connected to an operating member, and,   - a moving permanent contact (30) integral with the moving arc contact (5, 54) and establishing, when the contact breaker is in the depressed position, an electrical connection between the said first (4) and the said second (13) contacts, characterised in that the said moving permanent contact is a tubular part (30) of short length, the said first and second contacts being arranged in two circular arcs respectively. <??>Application to medium voltage contact breakers. <IMAGE>

Description

La présente invention est relative à un disjoncteur à moyenne tension, dans lequel l'isolement électrique est assuré par un gaz à bonnes propriétés diélectriques tel que l'hexafluorure de soufre SF6.The present invention relates to a medium-voltage circuit breaker, in which the electrical insulation is ensured by a gas with good dielectric properties such as sulfur hexafluoride SF6.

L'invention concerne plus particulièrement un disjoncteur dans lequel circule un courant d'intensité importante (plusieurs milliers d'ampères). Ce type de disjoncteur se rencontre dans les centrales électriques, en sortie d'alternateur et en amont du transformateur électrique de tension.The invention relates more particularly to a circuit breaker in which a current of high intensity (several thousand amperes) flows. This type of circuit breaker is found in power plants, at the output of the alternator and upstream of the electrical voltage transformer.

Le document EP 0 011 542 décrit un dispositif de coupure à moyenne tension comprenant une enveloppe en matériau isolant rempli de gaz à bonnes propriétés diélectriques, des premiers contacts reliés à une première prise de courant et des seconds contacts reliés à une seconde prise de courant, un contact d'arc fixe relié à la première prise de courant et un contact d'arc mobile relié à un organe de manoeuvre, et un contact permanent mobile établissant, lorsque le disjoncteur est en position enclenchée, une liaison entre les premiers et seconds contacts.The document EP 0 011 542 describes a medium-voltage switching device comprising an envelope made of insulating material filled with gases having good dielectric properties, first contacts connected to a first socket and second contacts connected to a second socket, a fixed arcing contact connected to the first socket and a movable arcing contact connected to an operating member, and a permanent movable contact establishing, when the circuit breaker is in the engaged position, a connection between the first and second contacts .

Dans ce type de disjoncteurs, le contact mobile permanent, par lequel transite le courant permanent, est le plus souvent un tube de cuivre de masse relativement élevée qui, lors d'un déclenchement, est entraîné avec le contact d'arc, à grande vitesse. L'énergie nécessaire à cette manoeuvre est importante puisqu'elle est proportionnelle au produit de la masse de l'équipage mobile par le carré de la vitesse de déplacement de cet équipage. Tous les constructeurs cherchent à diminuer cette énergie de manoeuvre, car son importance pénalise le prix de revient de la commande de l'appareil de coupure.In this type of circuit breaker, the permanent movable contact, through which the permanent current passes, is most often a copper tube of relatively high mass which, when tripped, is driven with the arcing contact, at high speed. . The energy necessary for this maneuver is important since it is proportional to the product of the mass of the moving assembly by the square of the speed of movement of this crew. All manufacturers seek to reduce this operating energy, because its importance penalizes the cost price of the control of the switching device.

Un premier but de l'invention est de réaliser un disjoncteur dans lequel la masse de l'équipage mobile est diminuée, de manière à diminuer corrélativement l'énergie nécessaire à la manoeuvre de déclenchement.A first object of the invention is to provide a circuit breaker in which the mass of the movable assembly is reduced, so as to correlatively reduce the energy required for the tripping operation.

Dans les disjoncteurs connus, le courant permanent traverse des contacts glissants; ces contacts doivent être de construction soignée et grèvent le prix de l'appareil.In known circuit breakers, the permanent current passes through sliding contacts; these contacts must be of careful construction and increase the price of the device.

Un autre but de l'invention est d'élaborer un disjoncteur dans lequel le courant permanent ne traverse pas de contacts glissants, de sorte qu'une économie sur le prix de l'appareil est réalisée.Another object of the invention is to develop a circuit breaker in which the permanent current does not pass through sliding contacts, so that savings are made on the price of the device.

Ces buts sont atteints selon l'invention par le disjoncteur tel que défini dans la revendication 1 ci-jointe. En ce qui concerne des exemples de mises en oeuvre préférées, référence est faite aux revendications secondaires.These objects are achieved according to the invention by the circuit breaker as defined in claim 1 attached. As regards examples of preferred embodiments, reference is made to the secondary claims.

L'invention sera bien comprise par la description donnée ci-après d'un mode préféré de réalisation en référence au dessin annexé dans lequel:

  • la figure 1 est une vue en élévation en coupe axiale d'un disjoncteur à moyenne tension selon un premier mode de réalisation de l'invention, représenté en position enclenchée, l'extinction de l'arc étant assurée par soufflage,
  • la figure 2 est une vue en coupe selon la ligne II-II de la figure 1, la buse de soufflage n'étant pas représentée,
  • la figure 3 est une vue en élévation en coupe axiale du même disjoncteur représenté en position déclenchée,
  • la figure 4 est une vue en élévation en coupe axiale d'un disjoncteur selon une variante de réalisation de l'invention dans laquelle l'extinction de l'arc est assurée au moyen d'une ampoule à vide.
The invention will be better understood from the description given below of a preferred embodiment with reference to the appended drawing in which:
  • FIG. 1 is an elevational view in axial section of a medium-voltage circuit breaker according to a first embodiment of the invention, shown in the engaged position, the extinction of the arc being ensured by blowing,
  • FIG. 2 is a sectional view along line II-II of FIG. 1, the blowing nozzle not being shown,
  • FIG. 3 is an elevational view in axial section of the same circuit breaker shown in the tripped position,
  • Figure 4 is an elevational view in axial section of a circuit breaker according to an alternative embodiment of the invention in which the extinction of the arc is ensured by means of a vacuum interrupter.

Dans les figures 1 à 3, la référence 1 désigne une enveloppe isolante, étanche, de préférence cylindrique, munie d'un fond 1A et remplie d'un gaz à bonnes propriétés diélectriques tel que l'hexafluorure de soufre SF6, sous une pression de 1 à plusieurs bars.In FIGS. 1 to 3, the reference 1 designates an insulating, leaktight envelope, preferably cylindrical, provided with a bottom 1A and filled with a gas with good dielectric properties such as sulfur hexafluoride SF6, under a pressure of 1 to several bars.

Un première prise de courant 2, connectée en amont dans le circuit à protéger, traverse l'enveloppe 1 de manière étanche grâce à un joint 3; la prise 2 se prolonge à l'intérieur de l'enveloppe, d'une part par une couronne de doigts 4, d'autre part par un contact 5 disposé selon l'axe géométrique 6 de l'enveloppe. Les doigts 4 sont disposés au voisinage de la paroi de l'enveloppe, parallèlement à l'axe 6, et occupent un arc de cercle a d'environ 120 degrés, le plan de ce cercle étant perpendiculaire à l'axe 6.A first socket 2, connected upstream in the circuit to be protected, crosses the casing 1 in a sealed manner by means of a seal 3; the socket 2 extends inside the envelope, on the one hand by a ring of fingers 4, on the other hand by a contact 5 arranged along the geometric axis 6 of the envelope. The fingers 4 are arranged in the vicinity of the wall of the envelope, parallel to the axis 6, and occupy an arc of a circle of approximately 120 degrees, the plane of this circle being perpendicular to the axis 6.

On verra plus loin comment une limite supérieure de l'arc de cercle précité peut être déterminée avec précision. Le contact 5 est une tige métallique terminée par une extrémité 5A en alliage résistant aux effets de l'arc électrique, par exemple un alliage à base de tungstène.We will see later how an upper limit of the above-mentioned arc can be determined with precision. Contact 5 is a metal rod terminated by an end 5A of an alloy resistant to the effects of an electric arc, for example a tungsten-based alloy.

Une seconde prise de courant 10, connectée en aval dans le circuit à protéger, traverse l'enveloppe de manière étanche grâce à un joint 11, et se prolonge à l'intérieur de l'enveloppe 1 par une portion cylindrique 12 portant des plots de contact 13 disposés selon un arc de cercle a′ dont le plan est perpendiculaire à l'axe 6, de sorte que les plots 13 sont en vis-à-vis des extrémités des doigts 4. L'arc de cercle a′ selon lequel sont disposés les plots 13 est de préférence de même longueur que l'arc a des doigts 4 et on verra plus loin comment déterminer une limite supérieure de sa longueur.A second socket 10, connected downstream in the circuit to be protected, crosses the envelope in a sealed manner thanks to a seal 11, and is extended inside the envelope 1 by a cylindrical portion 12 carrying studs contact 13 arranged in an arc a ′ whose plane is perpendicular to the axis 6, so that the studs 13 are opposite the ends of the fingers 4. The circular arc a ′ according to which the studs 13 are arranged is preferably of the same length as the arc has the fingers 4 and we will see further how to determine an upper limit of its length.

L'ensemble fixe du disjoncteur est complété par un cylindre de soufflage 14, en matériau isolant, coaxial à l'axe 6, fixé à la paroi par des pattes 15, et dont le fond 16 présente une ouverture pour le passage d'un élément de l'équipage mobile.The fixed assembly of the circuit breaker is completed by a blowing cylinder 14, made of insulating material, coaxial with the axis 6, fixed to the wall by lugs 15, and the bottom 16 of which has an opening for the passage of an element of the moving crew.

L'équipage mobile comprend un tube métallique 20, s'engageant dans l'ouverture précitée du fond 16 et fixé, par une première extrémité, à une bielle de manoeuvre 21 en matériau isolant. La bielle 21 est articulée à une manivelle 22 entraînée en rotation par un arbre 23 qui traverse la paroi 1 et qui est reliée à l'extérieur de cette enveloppe à un dispositif de manoeuvre non représenté.The mobile assembly comprises a metal tube 20, engaging in the aforementioned opening of the bottom 16 and fixed, by a first end, to an operating rod 21 made of insulating material. The connecting rod 21 is articulated to a crank 22 rotated by a shaft 23 which passes through the wall 1 and which is connected outside of this envelope to an operating device, not shown.

La seconde extrémité du tube 20 porte une couronne de doigts de contact 25 constituant le contact d'arc mobile et coopérant avec le contact d'arc fixe 5.The second end of the tube 20 carries a ring of contact fingers 25 constituting the movable arcing contact and cooperating with the fixed arcing contact 5.

Le tube 20 porte un piston de soufflage 26 coulissant à l'intérieur du cylindre de soufflage 14 et muni d'ouvertures calibrées 27.The tube 20 carries a blowing piston 26 sliding inside the blowing cylinder 14 and provided with calibrated openings 27.

Au piston 26 est fixée un buse de soufflage 28 en matériau isolant tel que du polytétrafluoro-éthylène connu sous la marque déposée téflon.To the piston 26 is fixed a blowing nozzle 28 made of insulating material such as polytetrafluoroethylene known under the registered trademark Teflon.

Le contact mobile permanent est constitué par un tube de cuivre 30, de diamètre choisi pour coopérer, lorsque le disjoncteur est en position enclenchée (figures 1 et 2), avec les doigts 4 et les plots 13. Ce tube 30 est rendu solidaire du tube 20 par des bras métalliques 31; une tresse métallique 32 relie un bras 31 à la prise amont 10-12.The permanent movable contact consists of a copper tube 30, of diameter chosen to cooperate, when the circuit breaker is in the engaged position (FIGS. 1 and 2), with the fingers 4 and the studs 13. This tube 30 is made integral with the tube 20 by metal arms 31; a metal braid 32 connects an arm 31 to the upstream socket 10-12.

Le fonctionnement du disjoncteur est le suivant:
   en position enclenchée, le courant traverse la prise amont 2, les doigts 4, le tube 30, les doigts 13 et la prise aval 10.The circuit breaker works as follows:
in the engaged position, the current flows through the upstream outlet 2, the fingers 4, the tube 30, the fingers 13 and the downstream outlet 10.

Pour ouvrir le disjoncteur, la commande produit un mouvement de rotation à l'arbre 23, qui est transformé par la manivelle 22 et la bielle 21 en un mouvement de translation du tube 20 vers le bas de la figure 1. Le contact 30 quitte les doigts 4 et les plots 13 et le courant commute alors sur la tige 5 et les doigts 25; le mouvement se poursuivant, les doigts 25 quittent la tige 5 et un arc 40 s'allume (figure 3). Le gaz du cylindre 14 est comprimé, s'échappe par les ouvertures 27 et traverse la buse 28, en soufflant l'arc qui s'éteint au premier passage par zéro du courant.To open the circuit breaker, the control produces a rotational movement at the shaft 23, which is transformed by the crank 22 and the connecting rod 21 into a translational movement of the tube 20 towards the bottom of FIG. 1. The contact 30 leaves the fingers 4 and the studs 13 and the current then switches on the rod 5 and the fingers 25; the movement continuing, the fingers 25 leave the rod 5 and an arc 40 lights up (FIG. 3). The gas from cylinder 14 is compressed, escapes through the openings 27 and passes through the nozzle 28, blowing out the arc which extinguishes on the first zero current crossing.

Grâce à la très courte longueur du tube 30, l'équipage mobile est très léger et ne nécessite, toutes choses étant égales par ailleurs, qu'une énergie de manoeuvre réduite. On observe par ailleurs que le courant permanent ne traverse qu'un seul jeu de contacts, la conception de l'appareil permettant l'absence de tout contact glissant.Thanks to the very short length of the tube 30, the moving assembly is very light and requires, all other things being equal, only a reduced operating energy. It is also observed that the permanent current crosses only one set of contacts, the design of the device allowing the absence of any sliding contact.

L'arc a et l'arc a′ sont choisis pour assurer la tenue de la tension lorsque le disjoncteur est en position déclenchée. Ainsi une distance minimale d'isolement 1 entre les doigts 4 d'extrémité et les plots 13 d'extrémités devra être respectée (figure 2). De même une distance d'isolement minimale devra être respectée entre le piston 26 ou le tube 30, au potentiel de la prise aval, et les doigts 4 au potentiel de la prise amont. L'homme du métier saura calculer ces distances en fonction notamment de la tension nominale du disjoncteur, du diamètre intérieur de l'enceinte et de la rigidité diélectrique du gaz d'isolement utilisé.Arc a and arc a ′ are chosen to ensure voltage withstand when the circuit breaker is in the tripped position. Thus a minimum isolation distance 1 between the end fingers 4 and the studs 13 at the ends must be respected (FIG. 2). Likewise, a minimum isolation distance must be maintained between the piston 26 or the tube 30, at the potential of the downstream outlet, and the fingers 4 at the potential of the upstream outlet. Those skilled in the art will know how to calculate these distances depending in particular on the nominal voltage of the circuit breaker, the inside diameter of the enclosure and the dielectric strength of the insulation gas used.

La tresse 32 est utilisée pour le passage du courant seulement pendant la manoeuvre du disjoncteur, quand le tube 30 a quitté les plots 4 et 13; le courant passe alors par les éléments 5A, 25, 20, 31 et la tresse 32 reliée à la prise 10.The braid 32 is used for the passage of the current only during the operation of the circuit breaker, when the tube 30 has left the pads 4 and 13; the current then passes by elements 5A, 25, 20, 31 and the braid 32 connected to the socket 10.

On peut, en variante, remplacer le cylindre et le piston de soufflage par une ampoule à vide. La figure 4 illustre un disjoncteur, conforme à celui représenté dans les figures 1 à 3, mais dans lequel le cylindre 14, le piston 27, le tube 20, les contacts 5A et 25 ainsi que la buse 28 sont remplacés par une ampoule à vide 50 comprenant:

  • un boîtier isolant 51,
  • un couvercle métallique 52 relié à des doigts de contact 53 coopérant avec la tige 5,
  • un contact fixe 54 intérieur à l'ampoule,
  • un contact mobile 55 relié extérieurement à l'ampoule à la bielle de manoeuvre 21,
  • des soufflets d'étanchéité 56 et 57.
Alternatively, the cylinder and the blowing piston can be replaced by a vacuum interrupter. Figure 4 illustrates a circuit breaker, according to that shown in Figures 1 to 3, but in which the cylinder 14, the piston 27, the tube 20, the contacts 5A and 25 as well as the nozzle 28 are replaced by a vacuum interrupter 50 including:
  • an insulating housing 51,
  • a metal cover 52 connected to contact fingers 53 cooperating with the rod 5,
  • a fixed contact 54 inside the bulb,
  • a movable contact 55 connected externally to the bulb to the operating rod 21,
  • sealing bellows 56 and 57.

Le fonctionnement de cette variante de réalisation du disjoncteur est tout à fait semblable à celui qui a été décrit plus haut et ses avantages identiques.The operation of this alternative embodiment of the circuit breaker is quite similar to that which has been described above and its advantages identical.

L'invention trouve application dans la réalisation de disjoncteurs de tension nominale inférieure ou égale à 45 kV, et en particulier, de disjoncteurs de centrale.The invention finds application in the production of circuit breakers with a nominal voltage less than or equal to 45 kV, and in particular, plant circuit breakers.

On peut également envisager de mettre en oeuvre l'invention pour réaliser des disjoncteurs à basse tension à isolement dans l'air ou dans un gaz à rigidité électrique élevée.It is also possible to envisage implementing the invention for producing low-voltage circuit breakers with insulation in air or in a gas with high electrical rigidity.

Claims (5)

  1. A medium tension circuit breaker comprising a casing (1) of insulating material enclosing a gas having good dielectric properties and containing the following:
       first contacts (4) connected to a first current terminal (2) and second contacts (13) connected to a second current terminal (10);
       a fixed arcing contact (5, 54) connected to said first current terminal and a moving arcing contact (25, 55) fixed to a connecting rod (21) mechanically connected to a drive member and electrically connected to second current terminal; and
       a moving permanent contact (30) fixed to the moving arcing contact (25, 55) and providing a connection between said first and second contacts (4, 13) when the circuit breaker is in the engaged position;
       the circuit being characterized in that said moving permanent contact is a tubular part (30) which is short in its displacement direction, such that the flow of electrical current is interrupted therein before the appearance of the arc during an opening movement, with said first and second contacts being disposed on two respective circular arcs that are spaced apart on either side of the same circle.
  2. A circuit breaker according to claim 1, characterized in that the angular extends (a, a') of the circular arcs of the first and second contacts (4, 13) are about 120°.
  3. A circuit breaker according to claim 1 or 2, characterized in that said moving permanent contact is connected to said second terminal (10) by a metal braid (32).
  4. A circuit breaker according to any one of claims 1 to 3, characterized in that it includes a blast piston (26) and cylinder (20) for directing a jet of gas into the arcing zone.
  5. A circuit breaker according to any one of claims 1 to 3, characterized in that said fixed arcing contact (54) and said moving arcing contact (55) constitute portions of a vacuum bulb connected firstly to said first terminal (2) and secondly to said moving permanent contact (30).
EP90115069A 1989-08-09 1990-08-06 Medium voltage switch Expired - Lifetime EP0412479B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8910726 1989-08-09
FR8910726A FR2650911B1 (en) 1989-08-09 1989-08-09 MEDIUM VOLTAGE CIRCUIT BREAKER

Publications (2)

Publication Number Publication Date
EP0412479A1 EP0412479A1 (en) 1991-02-13
EP0412479B1 true EP0412479B1 (en) 1994-11-30

Family

ID=9384610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90115069A Expired - Lifetime EP0412479B1 (en) 1989-08-09 1990-08-06 Medium voltage switch

Country Status (12)

Country Link
US (1) US5151565A (en)
EP (1) EP0412479B1 (en)
JP (1) JP2568303B2 (en)
CN (1) CN1022715C (en)
AT (1) ATE114867T1 (en)
BR (1) BR9003867A (en)
CA (1) CA2023033C (en)
DE (1) DE69014473T2 (en)
DK (1) DK0412479T3 (en)
ES (1) ES2067603T3 (en)
FR (1) FR2650911B1 (en)
GR (1) GR3015152T3 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2676588B1 (en) * 1991-05-16 1993-07-23 Alsthom Gec MEDIUM VOLTAGE CIRCUIT BREAKER.
US5661280A (en) * 1995-08-02 1997-08-26 Abb Power T&D Company Inc. Combination of a gas-filled interrupter and oil-filled transformer
DE19613568A1 (en) * 1996-04-04 1997-10-09 Asea Brown Boveri Circuit breaker
FR2763171B1 (en) * 1997-05-07 1999-07-09 Gec Alsthom T & D Sa CIRCUIT BREAKER
FR2763422B1 (en) * 1997-05-15 1999-07-09 Gec Alsthom T & D Sa GENERATOR CIRCUIT BREAKER
DE19826202C2 (en) * 1998-06-10 2000-12-14 Siemens Ag Insulating component for high voltage systems and process for its manufacture
IT1309626B1 (en) * 1999-11-03 2002-01-30 Vei Electric Systems Spa SECTIONING AND INTERRUPTION DEVICE, FOR ELECTRICAL CABINETS.
ITMI20062161A1 (en) * 2006-11-10 2008-05-11 Vei Power Distrib S P A TRIPOLAR EQUIPMENT FOR A COMPARTMENT IN MEDIUM OR HIGH VOLTAGE AND ITS COMPARTMENT INCLUDING THIS TRIPOLAR EQUIPMENT
CN105308705B (en) * 2013-04-15 2019-04-12 Abb 有限公司 Electric switch unit
FR3034281B1 (en) * 2015-03-27 2017-04-28 Schneider Electric Ind Sas METHOD FOR PRODUCING AN ELECTRICAL APPARATUS AND ELECTRICAL APPARATUS WITH IMPROVED SEALING

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FR1412478A (en) * 1964-08-01 1965-10-01 Merlin Gerin Arc extinguishing device comprising a closed enclosure filled with compressed gas
US3399286A (en) * 1966-03-07 1968-08-27 Powerdyne Inc High voltage electric swtich
US3408468A (en) * 1966-10-28 1968-10-29 Ite Circuit Breaker Ltd Differential pressure actuated switch utilizing high speed latch and lost motion means
US3555225A (en) * 1967-09-25 1971-01-12 Westinghouse Electric Corp Fluid-flow circuit interrupter with arc-assisted piston action
US4123636A (en) * 1975-12-31 1978-10-31 Westinghouse Electric Corp. Double-flow puffer-type single-pressure compressed-gas circuit-interrupter
US4139753A (en) * 1976-09-21 1979-02-13 Westinghouse Electric Corp. Puffer-type compressed-gas circuit-interrupter having improved separable contact structure
DE2809193A1 (en) * 1978-03-03 1979-09-06 Pfisterer Elektrotech Karl LV switchgear for distribution station - has U=shaped moving contact engaging inside pronged fixed contacts
IT8420810V0 (en) * 1984-02-10 1984-02-10 Sace Spa ARC CONTACT SYSTEM FOR ELECTRIC SWITCHES, PARTICULARLY WITH ARC EXTINGUISHING FLUID.
DE3407858A1 (en) * 1984-02-29 1984-08-02 Ernst Prof. Dr.techn.habil. 1000 Berlin Slamecka Electrical vacuum switch
US4563556A (en) * 1984-03-28 1986-01-07 Michel Goldstein Internal combustion circuit breaker
JPH0618099B2 (en) * 1984-09-20 1994-03-09 三菱電機株式会社 Circuit breaker
FR2596915B1 (en) * 1986-04-03 1994-02-18 Merlin Et Gerin SELF-BLOWING ELECTRIC CIRCUIT BREAKER HAVING HIGH DIELECTRIC HOLD
DE3636922C2 (en) * 1986-10-30 1994-08-11 Calor Emag Elektrizitaets Ag Bridge switch disconnector

Also Published As

Publication number Publication date
DE69014473D1 (en) 1995-01-12
ATE114867T1 (en) 1994-12-15
CA2023033A1 (en) 1991-02-10
CN1022715C (en) 1993-11-10
CN1049425A (en) 1991-02-20
EP0412479A1 (en) 1991-02-13
JPH0377227A (en) 1991-04-02
DE69014473T2 (en) 1995-04-20
ES2067603T3 (en) 1995-04-01
JP2568303B2 (en) 1997-01-08
DK0412479T3 (en) 1995-02-27
CA2023033C (en) 1994-02-08
GR3015152T3 (en) 1995-05-31
BR9003867A (en) 1991-09-03
US5151565A (en) 1992-09-29
FR2650911B1 (en) 1991-10-04
FR2650911A1 (en) 1991-02-15

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