EP0701264B1 - Gas blast circuitbreaker with semi mobile piston - Google Patents

Gas blast circuitbreaker with semi mobile piston Download PDF

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Publication number
EP0701264B1
EP0701264B1 EP95401992A EP95401992A EP0701264B1 EP 0701264 B1 EP0701264 B1 EP 0701264B1 EP 95401992 A EP95401992 A EP 95401992A EP 95401992 A EP95401992 A EP 95401992A EP 0701264 B1 EP0701264 B1 EP 0701264B1
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EP
European Patent Office
Prior art keywords
circuit
pressure wall
cylinder
breaker
tube
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Expired - Lifetime
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EP95401992A
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German (de)
French (fr)
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EP0701264A1 (en
Inventor
Michel Perret
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Grid Solutions SAS
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GEC Alsthom T&D SA
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Publication of EP0701264A1 publication Critical patent/EP0701264A1/en
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    • 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
    • H01H33/905—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 compression volume being formed by a movable cylinder and a semi-mobile piston

Definitions

  • the present invention relates to a self-blowing circuit breaker semi-movable piston.
  • a circuit breaker of the type self-blowing comprising an envelope filled with a gas dielectric under pressure, two arcing contacts cooperating between them, at least one of which is part of a set of movable contact secured to an operating member and adapted to be moved axially in the envelope between a closed position and an open position, the mobile contact assembly being constituted by a first tube and a second coaxial tube to the first tube for delimit, on either side of a first crown connecting the first and second tubes, a blowing and a compression chamber communicating with the blowing chamber and closed by a pressure wall a semi-mobile piston biased by a bearing spring on a fixed flange.
  • the object of the invention is to reduce consumption of the circuit breaker during an opening operation.
  • the piston consists of two parts, a first part comprising a first pressure wall and a second part comprising a second pressure wall, of surface front lower than that of the first wall of pressure, these two adjacent walls forming the wall of pressure of the piston and the first part being supported in the same direction as the opening direction against the second part on an inclined surface, in the closed position of the circuit breaker.
  • said first part consists of a sliding cylinder on the first tube and provided at its end opposite the contacts with a annular flange intended to abut against said fixed flange in the closed position of the circuit breaker, of said annular pressure wall integral with said cylinder at its other end and a cylindrical part coaxial with said cylinder, integral with said pressure wall by one of its ends and having a surface inclined to its other end.
  • said second part is made up a cylinder section coaxial with said cylinder and provided with its end opposite to the contacts of an inclined surface complementary to the inclined surface of the first part and said second pressure wall integral with the other end of said cylinder section.
  • said cylinder section is consisting of a tulip of fingers and the second wall of pressure protrudes into the compression chamber by relative to the first pressure wall, in the closed position of the circuit breaker.
  • said second part is requested by a spring supported by its end opposite the contacts on said fixed flange and, preferably, said first part is also stressed by a spring supported by its end opposite the contacts on said fixed flange.
  • Figure 1 is a longitudinal sectional view of a circuit breaker according to the invention in the closed position.
  • Figure 2 is a longitudinal sectional view of a circuit breaker according to the invention being opened.
  • Figure 3 is a longitudinal sectional view of a circuit breaker according to the invention in the open position.
  • the reference 1 designates an envelope preferably insulating, for example porcelain, filled a gas with good dielectric properties, for example sulfur hexafluoride under a pressure of a few bars.
  • the circuit breaker includes a fixed assembly and a mobile contact assembly.
  • the fixed assembly includes an arcing contact 3, consisting of a metal tube whose end 3A is made in a material resistant to the effects of the arc, for example a tungsten based alloy.
  • Fixed set includes also a permanent fixed contact 4 consisting of fingers. The arcing contact and the fixed permanent contact are connected electrically to a first outlet, not represented.
  • the movable contact assembly includes a operation 6 passing through the chamber in a sealed manner and connected to a mechanism not shown.
  • Room 6 is connected a metal assembly comprising two tubes 7 and 8 coaxial, the tube 8 having a larger diameter than the tube 7.
  • the two tubes 7, 8 are interconnected by a metal crown 9. These tubes and this crown are of preferably made in one piece from machining.
  • the tube 7 constitutes the movable arcing contact. His end 7A is made of a material resistant to effects of the arc and cooperates with contact 3, 3A.
  • Tube 8 has an end 8A carrying a blowing nozzle 10 in insulating material.
  • the tubular portion 8A constitutes the permanent mobile contact of the circuit breaker and cooperates when the circuit breaker is in the on position (position closing) with fingers 4 as shown in Figure 1.
  • the end 8A of the tube 8, the blowing nozzle 10, the tube 7 and the crown 9 define a blowing chamber 17.
  • the crown 9, the tubes 7 and 8 and a piston 11 delimit a compression chamber 18 separate from the blowing chamber 17 by the crown 9.
  • the piston slides axially between the tubes 7 and 8 in a sealed manner.
  • the tube 8 slides on a fixed cylinder 10 comprising an inner annular flange 10A.
  • the piston 11 consists of two parts 12, 13, a first part 12 comprising a large pressure wall 12A, called the first pressure wall, and a second part 13 comprising a small wall of pressure 13A, called the second pressure wall, these two adjacent walls forming the pressure wall of the piston 11.
  • These two parts 12, 13 are in mutual support one against the other on an inclined surface, in the closed position of the circuit breaker, the first part 12 being in abutment against the second part 13 in the same direction as the opening direction.
  • the first part 12 consists of a cylinder 12B sliding on the first tube 7 and provided at its end opposite the contacts of an annular flange 12C intended for come into abutment against the fixed flange 10A in the closed position of the circuit breaker, of said annular pressure wall 12A integral with said cylinder 12B at its other end and with a cylindrical part 12D coaxial with cylinder 12B, integral of the pressure wall 12A by one of its ends and having an inclined surface 12E at its other end.
  • This first part 12 is biased by a spring 15 in support at its end opposite the contacts on the flange fixed 10A and slides on tube 7.
  • the second part 13 consists of a section of cylinder 13B coaxial with said cylinder and provided with its end opposite to the contacts of an inclined surface 13C complementary to the inclined surface 12E of the first part 12 and said second pressure wall 12A secured to the other end of the cylinder section 13B.
  • the cylinder section 13B preferably consists of a arm tulip. This second part 13 is requested by a spring 14 supported by its end opposite to contacts on the fixed flange 10A and slides on the tube 8 and on cylinder 10.
  • the angle inclination with respect to the horizontal of the surfaces inclined is less than 30 °.
  • the pressure force R exerted by the compressed gas in the compression chamber 18 on the pressure wall 12A of the first part 12 of the piston 11 breaks down on the inclined surface 13C in a horizontal component F reduced collected by the springs 14 and 15.
  • the wall of pressure 13A of the second part 13 being small, the effort pressure exerted by the compressed gas in the compression 18 on this pressure wall 13A is reduced and is received by the spring 14.
  • the two springs 14 and 15 can therefore be weak positioning springs, much less force than the springs of art anterior to semi-movable one-piece piston.
  • the vertical component N on the surface 13C on the other hand is important and tends to press the fingers of the cylindrical section 13B against the fixed cylinder 10 and therefore at block the second part 13 in a fixed position, which immobilizes the piston 11.
  • the pressure wall 13A is by elsewhere projecting into the compression chamber 18 by compared to the pressure wall 12A. When the crown 9 reaches the wall 13A, as shown in FIG. 2, it pushes this wall 13A which separates the surfaces inclined 12E and 13C and cancels the vertical component N and the piston 11 as a whole is easily driven in the end of the opening movement.
  • the gas is not compressed in the compression chamber 18 during the entire movement of the movable contact assembly. From the moment the piston moves with the movable contact assembly, its pressure wall coming in stop against crown 9, the amount of energy required to operate the moving contact assembly is very reduced because there is no more gas compression.

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  • Circuit Breakers (AREA)
  • Reciprocating Pumps (AREA)
  • Switches With Compound Operations (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

The arc-extinguishing circuit breaker comprises an envelope (1) filled with dielectric gas under pressure. The envelope contains two arc contacts (3A,7A) cooperating together, and includes a mobile contract assembly formed by a first tube (7) and a second coaxial tube (8) defining an extinguishing chamber (17). A compression chamber (18) communicates with the extinction chamber (17) and is closed by a semi-mobile pressure piston wall (11). The piston (11) consists of two parts (12,13) comprising first and second pressure walls (12A,13A), the second being of smaller surface area than the first.

Description

La présente invention concerne un disjoncteur à auto-soufflage à piston semi-mobile.The present invention relates to a self-blowing circuit breaker semi-movable piston.

Elle concerne plus précisément un disjoncteur du type à auto-soufflage, comprenant une enveloppe remplie d'un gaz diélectrique sous pression, deux contacts d'arc coopérant entre eux, l'un au moins faisant partie d'un ensemble de contact mobile solidaire d'un organe de manoeuvre et adapté pour être déplacé axialement dans l'enveloppe entre une position de fermeture et une position d'ouverture, l'ensemble de contact mobile étant constitué par un premier tube et un second tube coaxial au premier tube pour délimiter, de part et d'autre d'une première couronne reliant le premier et le second tubes, une chambre de soufflage et une chambre de compression communiquant avec la chambre de soufflage et fermée par une paroi de pression d'un piston semi-mobile sollicité par un ressort en appui sur une bride fixe. (EP-A-0 591 039)It relates more precisely to a circuit breaker of the type self-blowing, comprising an envelope filled with a gas dielectric under pressure, two arcing contacts cooperating between them, at least one of which is part of a set of movable contact secured to an operating member and adapted to be moved axially in the envelope between a closed position and an open position, the mobile contact assembly being constituted by a first tube and a second coaxial tube to the first tube for delimit, on either side of a first crown connecting the first and second tubes, a blowing and a compression chamber communicating with the blowing chamber and closed by a pressure wall a semi-mobile piston biased by a bearing spring on a fixed flange. (EP-A-0 591 039)

Pendant une opération d'ouverture, le gaz dans la chambre de compression est comprimé du fait que la distance entre le piston et la couronne séparant la chambre de compression de la chambre de soufflage décroít. Durant ce déplacement, c'est le ressort qui maintient le piston semi-mobile en position fixe à l'encontre de la pression du gaz contre sa paroi de pression dans la chambre de compression. Il est donc nécessaire de prévoir un ressort d'effort suffisant. Cet effort se transmet dans la cinématique de l'appareil et est en général encaissé par l'organe de manoeuvre, en général une bielle, et par des leviers coopérant avec cette dernière. Une opération d'ouverture nécessite donc une certaine consommation d'énergie.During an opening operation, the gas in the compression chamber is compressed because the distance between the piston and the crown separating the chamber compression of the blowing chamber decreases. During this displacement, it is the spring which holds the semi-mobile piston in fixed position against gas pressure against its pressure wall in the compression chamber. It is therefore necessary to provide a force spring sufficient. This effort is transmitted in the kinematics of the device and is generally collected by the operation, generally a connecting rod, and by levers cooperating with the latter. An opening operation therefore requires a certain energy consumption.

Le but de l'invention est de réduire la consommation d'énergie du disjoncteur pendant une opération d'ouverture.The object of the invention is to reduce consumption of the circuit breaker during an opening operation.

Pour ce faire, conformément à l'invention, le piston est constitué de deux parties, une première partie comportant une première paroi de pression et une seconde partie comportant une seconde paroi de pression, de surface frontale inférieure à celle de la première paroi de pression, ces deux parois adjacentes formant la paroi de pression du piston et la première partie étant en appui dans le même sens que le sens d'ouverture contre la seconde partie selon une surface inclinée, en position fermée du disjoncteur.To do this, according to the invention, the piston consists of two parts, a first part comprising a first pressure wall and a second part comprising a second pressure wall, of surface front lower than that of the first wall of pressure, these two adjacent walls forming the wall of pressure of the piston and the first part being supported in the same direction as the opening direction against the second part on an inclined surface, in the closed position of the circuit breaker.

Selon un mode de réalisation préféré, ladite première partie est constitué d'un cylindre coulissant sur le premier tube et pourvu à son extrémité opposé aux contacts d'une bride annulaire destinée à venir en butée contre ladite bride fixe en position fermée du disjoncteur, de ladite paroi de pression annulaire solidaire dudit cylindre à son autre extrémité et d'une partie cylindrique coaxiale audit cylindre, solidaire de ladite paroi de pression par une de ses extrémités et comportant une surface inclinée à son autre extrémité.According to a preferred embodiment, said first part consists of a sliding cylinder on the first tube and provided at its end opposite the contacts with a annular flange intended to abut against said fixed flange in the closed position of the circuit breaker, of said annular pressure wall integral with said cylinder at its other end and a cylindrical part coaxial with said cylinder, integral with said pressure wall by one of its ends and having a surface inclined to its other end.

Avantageusement, ladite seconde partie est constituée d'un tronçon de cylindre coaxial audit cylindre et pourvu à son extrémité opposée aux contacts d'une surface inclinée complémentaire à la surface inclinée de la première partie et de ladite seconde paroi de pression solidaire de l'autre extrémité dudit tronçon de cylindre.Advantageously, said second part is made up a cylinder section coaxial with said cylinder and provided with its end opposite to the contacts of an inclined surface complementary to the inclined surface of the first part and said second pressure wall integral with the other end of said cylinder section.

Avantageusement, ledit tronçon de cylindre est constitué d'une tulipe de doigts et la seconde paroi de pression est en saillie dans la chambre de compression par rapport à la première paroi de pression, en position fermée du disjoncteur.Advantageously, said cylinder section is consisting of a tulip of fingers and the second wall of pressure protrudes into the compression chamber by relative to the first pressure wall, in the closed position of the circuit breaker.

Par ailleurs, ladite seconde partie est sollicitée par un ressort en appui par son extrémité opposée aux contacts sur ladite bride fixe et, de préférence, ladite première partie est également sollicitée par un ressort en appui par son extrémité opposée aux contacts sur ladite bride fixe.Furthermore, said second part is requested by a spring supported by its end opposite the contacts on said fixed flange and, preferably, said first part is also stressed by a spring supported by its end opposite the contacts on said fixed flange.

Les fonctions et avantages de ces caractéristiques apparaítront à la lecture de la description qui suit où l'invention est décrite ci-après plus en détail à l'aide de figures ne représentant qu'un mode de réalisation préféré de l'invention.The functions and advantages of these features will appear on reading the description which follows where the invention is described below in more detail using figures showing only a preferred embodiment of the invention.

La figure 1 est une vue en coupe longitudinale d'un disjoncteur conforme à l'invention en position fermée.Figure 1 is a longitudinal sectional view of a circuit breaker according to the invention in the closed position.

La figure 2 est une vue en coupe longitudinale d'un disjoncteur conforme à l'invention en cours d'ouverture.Figure 2 is a longitudinal sectional view of a circuit breaker according to the invention being opened.

La figure 3 est une vue en coupe longitudinale d'un disjoncteur conforme à l'invention en position ouverte.Figure 3 is a longitudinal sectional view of a circuit breaker according to the invention in the open position.

Dans ce qui suit, on décrira une chambre de coupure, étant entendu qu'un disjoncteur à haute tension, peut comporter, pour chaque phase, plusieurs chambres de coupure du type qui va être décrit. Sur les figures 1 à 3, les mêmes références désignent des éléments identiques.In what follows, we will describe a breaking chamber, it being understood that a high voltage circuit breaker can have, for each phase, several breaking chambers of the type to be described. In Figures 1 to 3, the same references denote identical elements.

Sur les figures, la référence 1 désigne une enveloppe de préférence isolante, par exemple en porcelaine, remplie d'un gaz à bonnes propriétés diélectriques, par exemple de l'hexafluorure de soufre sous une pression de quelques bars.In the figures, the reference 1 designates an envelope preferably insulating, for example porcelain, filled a gas with good dielectric properties, for example sulfur hexafluoride under a pressure of a few bars.

Le disjoncteur comprend un ensemble fixe et un ensemble de contact mobile.The circuit breaker includes a fixed assembly and a mobile contact assembly.

L'ensemble fixe comprend un contact d'arc 3, constitué d'un tube métallique dont l'extrémité 3A est réalisée en un matériau résistant aux effets de l'arc, par exemple un alliage à base de tungstène. L'ensemble fixe comprend également un contact permanent fixe 4 constitué de doigts. Le contact d'arc et le contact permanent fixe sont reliés électriquement à une première prise de courant, non représentée.The fixed assembly includes an arcing contact 3, consisting of a metal tube whose end 3A is made in a material resistant to the effects of the arc, for example a tungsten based alloy. Fixed set includes also a permanent fixed contact 4 consisting of fingers. The arcing contact and the fixed permanent contact are connected electrically to a first outlet, not represented.

L'ensemble de contact mobile comprend une pièce de manoeuvre 6 traversant la chambre de manière étanche et reliée à un mécanisme non représenté. A la pièce 6 est relié un ensemble métallique comprenant deux tubes 7 et 8 coaxiaux, le tube 8 ayant un diamètre plus grand que le tube 7. Les deux tubes 7, 8 sont reliés entre eux par une couronne métallique 9. Ces tubes et cette couronne sont de préférence réalisés en une seule pièce venue d'usinage. The movable contact assembly includes a operation 6 passing through the chamber in a sealed manner and connected to a mechanism not shown. Room 6 is connected a metal assembly comprising two tubes 7 and 8 coaxial, the tube 8 having a larger diameter than the tube 7. The two tubes 7, 8 are interconnected by a metal crown 9. These tubes and this crown are of preferably made in one piece from machining.

Le tube 7 constitue le contact d'arc mobile. Son extrémité 7A est réalisée en un matériau résistant aux effets de l'arc et coopère avec le contact 3, 3A. Le tube 8 possède une extrémité 8A portant une buse de soufflage 10 en matériau isolant. La portion tubulaire 8A constitue le contact mobile permanent du disjoncteur et coopère, lorsque le disjoncteur est en position enclenchée (position de fermeture) avec les doigts 4 comme le montre la figure 1.The tube 7 constitutes the movable arcing contact. His end 7A is made of a material resistant to effects of the arc and cooperates with contact 3, 3A. Tube 8 has an end 8A carrying a blowing nozzle 10 in insulating material. The tubular portion 8A constitutes the permanent mobile contact of the circuit breaker and cooperates when the circuit breaker is in the on position (position closing) with fingers 4 as shown in Figure 1.

L'extrémité 8A du tube 8, la buse de soufflage 10, le tube 7 et la couronne 9 délimitent une chambre de soufflage 17. La couronne 9, les tubes 7 et 8 et un piston 11 délimitent une chambre de compression 18 séparée de la chambre de soufflage 17 par la couronne 9. Le piston coulisse axialement entre les tubes 7 et 8 de façon étanche.The end 8A of the tube 8, the blowing nozzle 10, the tube 7 and the crown 9 define a blowing chamber 17. The crown 9, the tubes 7 and 8 and a piston 11 delimit a compression chamber 18 separate from the blowing chamber 17 by the crown 9. The piston slides axially between the tubes 7 and 8 in a sealed manner.

Le tube 8 coulisse sur un cylindre 10 fixe comportant une bride annulaire 10A intérieure.The tube 8 slides on a fixed cylinder 10 comprising an inner annular flange 10A.

Selon l'invention, le piston 11 est constitué de deux parties 12, 13, une première partie 12 comportant une grande paroi de pression 12A, dite première paroi de pression, et une seconde partie 13 comportant une petite paroi de pression 13A, dite seconde paroi de pression, ces deux parois adjacentes formant la paroi de pression du piston 11. Ces deux parties 12, 13 sont en appui mutuel l'une contre l'autre selon une surface inclinée, en position fermée du disjoncteur, la première partie 12 étant en appui contre la seconde partie 13 dans le même sens que le sens d'ouverture.According to the invention, the piston 11 consists of two parts 12, 13, a first part 12 comprising a large pressure wall 12A, called the first pressure wall, and a second part 13 comprising a small wall of pressure 13A, called the second pressure wall, these two adjacent walls forming the pressure wall of the piston 11. These two parts 12, 13 are in mutual support one against the other on an inclined surface, in the closed position of the circuit breaker, the first part 12 being in abutment against the second part 13 in the same direction as the opening direction.

La première partie 12 est constituée d'un cylindre 12B coulissant sur le premier tube 7 et pourvu à son extrémité opposé aux contacts d'une bride annulaire 12C destinée à venir en butée contre la bride fixe 10A en position fermée du disjoncteur, de ladite paroi de pression 12A annulaire solidaire dudit cylindre 12B à son autre extrémité et d'une partie cylindrique 12D coaxiale au cylindre 12B, solidaire de la paroi de pression 12A par une de ses extrémités et comportant une surface inclinée 12E à son autre extrémité. Cette première partie 12 est sollicitée par un ressort 15 en appui par son extrémité opposée aux contacts sur la bride fixe 10A et coulisse sur le tube 7.The first part 12 consists of a cylinder 12B sliding on the first tube 7 and provided at its end opposite the contacts of an annular flange 12C intended for come into abutment against the fixed flange 10A in the closed position of the circuit breaker, of said annular pressure wall 12A integral with said cylinder 12B at its other end and with a cylindrical part 12D coaxial with cylinder 12B, integral of the pressure wall 12A by one of its ends and having an inclined surface 12E at its other end. This first part 12 is biased by a spring 15 in support at its end opposite the contacts on the flange fixed 10A and slides on tube 7.

La seconde partie 13 est constituée d'un tronçon de cylindre 13B coaxial audit cylindre et pourvu à son extrémité opposée aux contacts d'une surface inclinée 13C complémentaire à la surface inclinée 12E de la première partie 12 et de ladite seconde paroi de pression 12A solidaire de l'autre extrémité du tronçon de cylindre 13B. Le tronçon de cylindre 13B est de préférence constitué d'une tulipe de bras. Cette seconde partie 13 est sollicitée par un ressort 14 en appui par son extrémité opposée aux contacts sur la bride fixe 10A et coulisse sur le tube 8 et sur le cylindre 10.The second part 13 consists of a section of cylinder 13B coaxial with said cylinder and provided with its end opposite to the contacts of an inclined surface 13C complementary to the inclined surface 12E of the first part 12 and said second pressure wall 12A secured to the other end of the cylinder section 13B. The cylinder section 13B preferably consists of a arm tulip. This second part 13 is requested by a spring 14 supported by its end opposite to contacts on the fixed flange 10A and slides on the tube 8 and on cylinder 10.

Selon le mode de réalisation préféré, l'angle d'inclinaison par rapport à l'horizontale des surfaces inclinées est inférieur à 30°.According to the preferred embodiment, the angle inclination with respect to the horizontal of the surfaces inclined is less than 30 °.

Grâce à l'agencement de surfaces inclinées conforme à l'invention, lors de l'ouverture, comme visible sur la figure 2, l'effort de pression R exercé par le gaz comprimé dans la chambre de compression 18 sur la paroi de pression 12A de la première partie 12 du piston 11 se décompose sur la surface inclinée 13C en une composante horizontale F réduite encaissée par les ressorts 14 et 15. La paroi de pression 13A de la seconde partie 13 étant petite, l'effort de pression exercé par le gaz comprimé dans la chambre de compression 18 sur cette paroi de pression 13A est réduit et est encaissé par le ressort 14. Les deux ressorts 14 et 15 peuvent donc être de faibles ressorts de positionnement, de force bien moins importante que les ressorts de l'art antérieur à piston semi-mobile d'une pièce.Thanks to the arrangement of inclined surfaces in accordance with the invention, upon opening, as visible on the Figure 2, the pressure force R exerted by the compressed gas in the compression chamber 18 on the pressure wall 12A of the first part 12 of the piston 11 breaks down on the inclined surface 13C in a horizontal component F reduced collected by the springs 14 and 15. The wall of pressure 13A of the second part 13 being small, the effort pressure exerted by the compressed gas in the compression 18 on this pressure wall 13A is reduced and is received by the spring 14. The two springs 14 and 15 can therefore be weak positioning springs, much less force than the springs of art anterior to semi-movable one-piece piston.

De plus, la composante verticale N sur la surface 13C est par contre importante et tend à presser les doigts du tronçon cylindrique 13B contre le cylindre fixe 10 et donc à bloquer en position fixe la seconde partie 13, ce qui immobilise le piston 11. La paroi de pression 13A est par ailleurs en saillie dans la chambre de compression 18 par rapport à la paroi de pression 12A. Lorsque la couronne 9 atteint la paroi 13A, comme représenté sur la figure 2, elle pousse cette paroi 13A ce qui désolidarise les surfaces inclinées 12E et 13C et annule la composante verticale N et le piston 11 dans son ensemble est facilement entraíné dans la fin du déplacement d'ouverture.In addition, the vertical component N on the surface 13C on the other hand is important and tends to press the fingers of the cylindrical section 13B against the fixed cylinder 10 and therefore at block the second part 13 in a fixed position, which immobilizes the piston 11. The pressure wall 13A is by elsewhere projecting into the compression chamber 18 by compared to the pressure wall 12A. When the crown 9 reaches the wall 13A, as shown in FIG. 2, it pushes this wall 13A which separates the surfaces inclined 12E and 13C and cancels the vertical component N and the piston 11 as a whole is easily driven in the end of the opening movement.

Avantageusement, comme visible sur les figures 2 et 3, le gaz n'est pas comprimé dans la chambre de compression 18 pendant tout le déplacement de l'ensemble de contact mobile. A partir de l'instant où le piston se déplace avec l'ensemble de contact mobile, sa paroi de pression venant en butée contre la couronne 9, la quantité d'énergie nécessaire pour manoeuvrer l'ensemble de contact mobile est très réduite du fait qu'il n'y a plus de compression de gaz.Advantageously, as visible in FIGS. 2 and 3, the gas is not compressed in the compression chamber 18 during the entire movement of the movable contact assembly. From the moment the piston moves with the movable contact assembly, its pressure wall coming in stop against crown 9, the amount of energy required to operate the moving contact assembly is very reduced because there is no more gas compression.

Claims (7)

  1. A circuit-breaker of the puffer type, comprising a casing (1) filled with a dielectric gas under pressure, two arcing contacts (3A, 7A) co-operating with each other, at least one of which is part of a moving contact assembly secured to a drive member (6) and suitable for being moved axially inside the casing (1) between a closed position and an open position, the moving contact assembly being constituted by a first tube (7) and by a second tube (8) coaxial with the first tube so as to define a blast chamber (17) and a compression chamber (18) on either side of a first ring (9) interconnecting the first and second tubes, the compression chamber (18) communicating with the blast chamber (17) and being closed by a pressure wall of a semi-moving piston (11) urged by at least one spring that abuts against a fixed flange, said circuit-breaker being characterized in that the piston (11) is made up of two portions (12 and 13), a first portion (12) being provided with a first pressure wall (12A), and a second portion (13) being provided with a second pressure wall (13A) whose front face is smaller in area than the front face of the first pressure wall, these two walls being adjacent and co-operating to form the pressure wall of the piston (11), and, when the circuit-breaker is in the closed position, the first portion (12) abuts in the opening direction against the second portion (13) via a sloping surface.
  2. A circuit breaker according to claim 1, characterized in that said first portion (12) is constituted firstly by a cylinder (12B) mounted to slide on the first tube (7) and provided with an annular flange (12C) at its end that is further from the contacts, which annular flange comes into abutment against said fixed flange (10A) when the circuit-breaker is in the closed position, secondly by said annular pressure wall (12A) integral with said cylinder (12B) and disposed at the other end thereof, and thirdly by a cylindrical portion (12D) that is coaxial with said cylinder (12B), that is integral with said pressure wall (12A) via one of its ends, and that is provided with a sloping surface (12E) at its other end.
  3. A circuit-breaker according to claim 2, characterized in that said second portion (13) is constituted firstly by a cylinder segment (13B) coaxial with said cylinder and provided with a sloping surface (13C) at its end further from the contacts, which surface is complementary to the sloping surface (12E) of the first portion (12), and secondly by said second pressure wall (13A) integral with the other end of the cylinder segment (13B).
  4. A circuit-breaker according to claim 3, characterized in that said cylinder segment (13B) is constituted by a thimble of fingers.
  5. A circuit-breaker according to any preceding claim, characterized in that the second pressure wall (13A) projects into the compression chamber (18) relative to the first pressure wall (12A) when the circuit-breaker is in the closed position.
  6. A circuit-breaker according to any preceding claim, characterized in that said second portion (13) is urged by a spring (14) whose end further from the contacts abuts against said fixed flange (10A).
  7. A circuit-breaker according to claim 6, characterized in that said first portion (12) is urged by a spring (15) whose end further from the contacts abuts against said fixed flange (10A).
EP95401992A 1994-09-06 1995-09-01 Gas blast circuitbreaker with semi mobile piston Expired - Lifetime EP0701264B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9410659 1994-09-06
FR9410659A FR2724259B1 (en) 1994-09-06 1994-09-06 SEMI-MOBILE PISTON SELF-BLOWING CIRCUIT BREAKER

Publications (2)

Publication Number Publication Date
EP0701264A1 EP0701264A1 (en) 1996-03-13
EP0701264B1 true EP0701264B1 (en) 1999-10-20

Family

ID=9466725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95401992A Expired - Lifetime EP0701264B1 (en) 1994-09-06 1995-09-01 Gas blast circuitbreaker with semi mobile piston

Country Status (5)

Country Link
EP (1) EP0701264B1 (en)
AT (1) ATE185924T1 (en)
DE (1) DE69512858T2 (en)
ES (1) ES2138168T3 (en)
FR (1) FR2724259B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756413B1 (en) * 1996-11-28 1998-12-31 Gec Alsthom T & D Sa SEMI-MOBILE PISTON CIRCUIT BREAKER
EP3503152B1 (en) * 2017-12-22 2020-10-14 ABB Power Grids Switzerland AG Gas-insulated high or medium voltage circuit breaker
EP3503153B1 (en) 2017-12-22 2021-09-01 ABB Power Grids Switzerland AG Gas-insulated high or medium voltage circuit breaker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2014101C2 (en) * 1970-03-19 1982-06-03 Siemens AG, 1000 Berlin und 8000 München High voltage circuit breaker
FR2696274B1 (en) * 1992-09-29 1994-11-04 Alsthom Gec Self-blowing high voltage circuit breaker having a reduced gas compression interrupting chamber.

Also Published As

Publication number Publication date
EP0701264A1 (en) 1996-03-13
FR2724259B1 (en) 1996-11-22
DE69512858T2 (en) 2000-05-04
ATE185924T1 (en) 1999-11-15
DE69512858D1 (en) 1999-11-25
ES2138168T3 (en) 2000-01-01
FR2724259A1 (en) 1996-03-08

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