WO1999065048A1 - High and medium voltage circuit breaker with double movement comprising a blower tube guided in translation - Google Patents

High and medium voltage circuit breaker with double movement comprising a blower tube guided in translation Download PDF

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Publication number
WO1999065048A1
WO1999065048A1 PCT/FR1999/001337 FR9901337W WO9965048A1 WO 1999065048 A1 WO1999065048 A1 WO 1999065048A1 FR 9901337 W FR9901337 W FR 9901337W WO 9965048 A1 WO9965048 A1 WO 9965048A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
circuit breaker
rod
arcing
shaped
Prior art date
Application number
PCT/FR1999/001337
Other languages
French (fr)
Inventor
Michel Perret
Original Assignee
Alstom France S.A.
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 Alstom France S.A. filed Critical Alstom France S.A.
Priority to JP2000553970A priority Critical patent/JP2002518787A/en
Priority to CA002334991A priority patent/CA2334991A1/en
Priority to KR1020007013867A priority patent/KR20010052638A/en
Priority to EP99923684A priority patent/EP1093659A1/en
Publication of WO1999065048A1 publication Critical patent/WO1999065048A1/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
    • 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
    • H01H33/901—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 making use of the energy of the arc or an auxiliary arc
    • 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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
    • 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
    • H01H33/02—Details
    • H01H2033/028—Details the cooperating contacts being both actuated simultaneously in opposite directions

Definitions

  • High and medium voltage double circuit breaker comprising a guided blow nozzle in trans iation.
  • the invention relates to a medium circuit breaker or a main circuit breaker. inside a circuit breaker, a hollow arc contact and a rod-shaped arcing contact which is inserted into said hollow contact in an axial direction when the circuit breaker is closed, and a blowing nozzle which is coaxial and soii ⁇ air ⁇ CL hollow arcing contact and ⁇ ui a nozzle neck crosses because ie arcing contact in rod form the arcing contact and the nozzle this blowing on the one hand, the arcing contact of rod of other char. being ⁇ olac ⁇ s in the axial direction in opposite directions: crs at the opening at the circuit breaker
  • the two arcing contacts are separated by a movement in the ODDose direction to minimize the loss of kinetic energy during the opening of the circuit breaker.
  • the sewing of an alternating electric current is obtained by the separation of the arcing contacts after the separation of the main contacts.
  • the separation of the arcing contacts gives rise to an electric arc which increases the temperature of a dielectric gas contained in a thermal extension circuit closed by a clearance between the arcing contact in firm a ⁇ rod and the neck of the nozzle. blowing. This results in an overpressure and then an escape of the gas ⁇ ue along the neck of the blowing Dus ⁇ to blow the electric arc during a passage because zero had breaking current.
  • the object of the invention is to increase the breaking capacity of a double movement circuit breaker in which an electric arc is blown by a dielectric gas contained in a thermal extension chamber.
  • the idea underlying the invention is to limit or even eliminate, when the circuit breaker opens, any vibration of the arcing contact in the form of a rod relative to the coi of the blowing nozzle which it crosses .
  • the invention relates to a medium or high voltage circuit breaker which comprises, inside a breaking chamber, a hollow arcing contact and an arcing contact in the form of a rod which is inserted into said hollow contact in an axial direction when the circuit breaker is closed, and a blowing nozzle which is coaxial and integral with the hollow arc contact and which has a nozzle neck crossed by the rod-shaped arc contact, the hollow arcing contact and the blowing nozzle on the one hand, the rod-shaped arcing contact on the other hand, being displaced in the axial direction in opposite directions when the circuit breaker opens, characterized in that that the blowing nozzle is guided in translation along the rod-shaped arcing contact when the two arcing contacts are moved in opposite directions.
  • the guidance along the rod-shaped arc contact is obtained by means of a cylindrical skirt which is fixed to the blowing nozzle to slide inside a guide ring mounted on the inside a main contact tube secured to the rod-shaped arcing contact.
  • the cylindrical skirt is fixed by one end to a divergent part of the blowing nozzle and has another free end. This arrangement makes it possible to create a sufficiently large creepage distance to prevent the electric arc drawn between the two arcing contacts from traveling along the diverging part and of the cylindrical skirt while being attracted by the main contact.
  • Figure 1 is an axial half section of a circuit breaker with double movement in the closed position, in which a blowing nozzle is guided in translation by a cylindrical skirt.
  • Figure 2 shows the circuit breaker of Figure 1 in an intermediate open position.
  • Figure 3 shows the circuit breaker of Figure 1 in a fully open position.
  • a medium or high voltage isolator comprises, in FIG. 1, an insulating casing 1 forming a seam which expires in an axial direction A.
  • 3A and a hollow arc contact creamer 3B are carried by two coaxial tubes 3C and 3D which are integral and movable in the axial direction A.
  • An actuator not shown moves in translation the two tubes 3C and 3D which slide relative to two ccaxial tubes 7A and 7B of a fixed support 7 by means of sliding contacts 7C.
  • the two coaxial tubes 3C and 3D form a compression channel 3E which communicates with the interrupting chamber through an opening 7D formed at one end 7E of one of the tubes of the fixed support 7, and openings 7F and 7G formed respectively in the two tubes 7A and 7B of the fixed support 7.
  • a dielectric gas of nitrogen type N 2 or sulfur hexafluoride SF 6 is present in the breaking chamber under a pressure of a few cars and circulates inside the compression chamber through the openings.
  • the ⁇ isicnctor comprises a second main contact 5A and a second arcing contact in the form of a rod 5B which are carried respectively by a tube 5C and a cone 5D coaxial which are integral and movable in the axial direction A.
  • the rod-shaped arcing contact is inserted into the hollow arcing contact in the axial direction A.
  • the main contact 3A carries a blowing nozzle 9 which has ur, nozzle neck 9A crossed with a clearance by the arc contact in the form of this rod 5B to close a thermal expansion chamber 3H delimited by the blowing nozzle 9 and the main contacts 3A and arcing 3B.
  • the thermal expansion chamber 3H communicates with the compression chamber 3E via an opening 31 formed in a piston 3J secured to the two coaxial tubes 3C and 3D.
  • the circuit breaker is double-movement to minimize the energy expenditure of the operating member. When the circuit breaker opens, the main contact 3A and the hollow arcing contact 3B are moved integrally in the axial direction A to the right in FIG. 1, to be separated from the main contact 5A and the arcing contact respectively in the form of a rod 5B which are moved integrally in the axial direction A in the opposite direction, to the left in FIG. 1.
  • the displacement of the piston 3J causes compression of the dielectric gas contained in the compression chamber 3E.
  • the pressure rise is transmitted to the dielectric gas contained in the thermal extension chamber 3H and is reinforced by the temperature rise due to the formation of an electric arc drawn between the two arcing contacts 3B and 5B after their separation.
  • the rod-shaped arcing contact 5B comes out of the neck 9A of the blowing nozzle 9, the dielectric gas is blown on the electric arc to extinguish it during a zero crossing of the breaking current.
  • the blowing nozzle 9 is moved integrally from the hollow arc contact 3B while being guided in translation in the axial direction A along the rod-shaped arc contact 5B.
  • the guiding in translation is obtained by means of an insulating cylindrical skirt 11 which is fixed to the blowing nozzle 9 to slide inside a guide ring 5E fixed radially inside of the main contact 5A integral with the arcing contact in the form of a rod 5B.
  • a guide ring 5E fixed radially inside of the main contact 5A integral with the arcing contact in the form of a rod 5B.
  • the clearance between these two elements 9A and 5B is reduced to a value which makes it possible to increase the overpressure of the dielectric gas contained in the thermal expansion chamber 3H while maintaining the same safety with regard to the re-ignition of the arc electric. This results in an increase in the breaking capacity of the double movement circuit breaker.
  • the circuit breaker has a clearance of the order of 0.5 millimeters (mm), to be compared with a clearance of the order of 2 mm in a circuit breaker according to the prior art.
  • the circuit breaker is open in an intermediate position which corresponds to the separation of the arcing contacts 3B and 5B after the separation of the main contacts 3A and 5A.
  • An electric arc not shown, is drawn between the two arcing contacts 3B and 5B.
  • the blowing nozzle 9 has been moved integrally from the main contact 3A while being guided in translation along the rod-shaped arc contact 5B by the cylindrical skirt 11 which slides inside the guide ring 5E.
  • the cylindrical skirt 11 is fixed by one end 11 B to a divergent 9C of the blowing nozzle 9, and has another free end 11C.

Abstract

The invention concerns a circuit breaker comprising inside an interrupter chamber, a hollow arcing contact (3B) and an arcing contact in the form of a rod (5B) inserted in said hollow contact (3B) along an axial direction (A) when the circuit breaker is closed, and a blower tube (9) which is coaxial and integral with the hollow arcing (3B) and has a tube throat (9A) traversed by the rod-shaped arcing contact (5B), the hollow arcing contact (3B) and the blower tube (9) and the rod-shaped arcing contact (5B) being displaced along the axial direction (A) in opposite directions when the circuit breaker is opened. The invention is characterised in that the blower tube (9) is guided in translation along the rod-shaped arcing contact (5B) when the two arcing contacts (3B, 5B) move in opposite directions, thereby reducing the risk of contact or friction of the tube throat (9A) on the rod-shaped contact (5B), thus increasing the circuit breaker interrupting capacity.

Description

Disjoncteur αe haute et moyenne tension à αouble mouvement comprenant une buse αe soufflage guidée en trans iation . High and medium voltage double circuit breaker comprising a guided blow nozzle in trans iation.
L'invention se raDDorte à un disjoncteur αe moyenne ou de πaute teπsicr cui comorend. à l'intérieur d'une cnamore de coupure, un contact c arc creux et un contact d'arc en forme de tige qui est inséré dans lecit contact creux suivant une αirection axiale lorsque le disjoncteur est ferme, et une buse de soufflage qui est coaxiale et soiiαairε CL contact d'arc creux et αui cossède un col de buse traverse car ie contact d'arc en forme de tige le contact d'arc creux et la buse ce soufflage d'une part, le contact α'arc en forme de tige d'autre car. étant αέolacέs suivant la direction axiale en sens opposes :crs αe l'ouverture eu αisjoncteurThe invention relates to a medium circuit breaker or a main circuit breaker. inside a circuit breaker, a hollow arc contact and a rod-shaped arcing contact which is inserted into said hollow contact in an axial direction when the circuit breaker is closed, and a blowing nozzle which is coaxial and soiiαairε CL hollow arcing contact and αui a nozzle neck crosses because ie arcing contact in rod form the arcing contact and the nozzle this blowing on the one hand, the arcing contact of rod of other char. being αέolacέs in the axial direction in opposite directions: crs at the opening at the circuit breaker
Dans un tel disjoncteur, les deux contacts d'arc sont déσiacés suivant un ccuble mouvement en sens ODDosés pour minimiser la déDeπse d'énergie cinétique lors de l'ouverture du disjoncteur. La couDure d'un courant électrique alternatif s'obtient par la séparation des contacts d'arc après la séparation de contacts principaux. La séparation αes contacts d'arc donne naissance à un arc électrique qui augmente la temDérature d'un gaz diéiectπque contenu dans une cnamDre d'extension thermique fermée par un jeu entre le contact d'arc en ferme αε tige et le col de la buse de soufflage. Il en resuite une surcressien puis un échappement du gaz diéle παue le long du col de la Dusε de soufflage pour souffler l'arc électrique lors d'un passage car zéro eu courant de coupure.In such a circuit breaker, the two arcing contacts are separated by a movement in the ODDose direction to minimize the loss of kinetic energy during the opening of the circuit breaker. The sewing of an alternating electric current is obtained by the separation of the arcing contacts after the separation of the main contacts. The separation of the arcing contacts gives rise to an electric arc which increases the temperature of a dielectric gas contained in a thermal extension circuit closed by a clearance between the arcing contact in firm aε rod and the neck of the nozzle. blowing. This results in an overpressure and then an escape of the gas παue along the neck of the blowing Dusε to blow the electric arc during a passage because zero had breaking current.
On sait eue ie αouble mouvement s'acccmoagπe de vibrations qui provecueπ: αes déplacements relatifs non désirés entre les contacts cπncioaux et d'arc, et notamment entre le contact d'arc en forme ce tige et le col de la buse de soufflage solidaire du contact d'arc creux.It is known that a double movement accccmoagπe vibrations which causes: relative unwanted relative displacements between the circular and arcing contacts, and in particular between the arcing contact in the form of this rod and the neck of the blowing nozzle integral with the hollow arc contact.
Un contact ou un frottement du col de la buse sur le contact d'arc en forme ce tige est oréjudiciabie au fonctionnement du disjoncteur dans la mesure où il conduit à un nouvel amorçage de l'arc électrique lors de la coupure des courants capacitifs.Contact or friction of the nozzle neck on the arcing contact in the form of this rod is detrimental to the operation of the circuit breaker insofar as it leads to a new ignition of the electric arc during the breaking of the capacitive currents.
Aujourd'hui, on supprime le risque de ré-amorçage en choisissant un jeu suffisamment grand entre le col de la buse et ie contact d'arc en forme de tige. Cependant, cette solution n'est pas entièrement satisfaisante en ce qu'elle s'obtient au détriment de la surpression du gaz diélectrique dans la chambre d'extension thermique : un jeu important limite la surpression, et par conséquent, la coupure de courants élevés. Le but de l'invention est d'augmenter la capacité de coupure d'un disjoncteur à double mouvement dans lequel un arc électrique est soufflé par un gaz diélectrique contenu dans une chamDre d'extension thermique.Today, the risk of re-ignition is eliminated by choosing a sufficiently large clearance between the neck of the nozzle and the arcing contact in the form of a rod. However, this solution is not entirely satisfactory in that it is obtained at the expense of the overpressure of the dielectric gas in the thermal extension chamber: a large clearance limits the overpressure, and consequently, the breaking of high currents. . The object of the invention is to increase the breaking capacity of a double movement circuit breaker in which an electric arc is blown by a dielectric gas contained in a thermal extension chamber.
L'idée à la base de l'invention est de limiter voire d'éliminer, lors de l'ouverture du disjoncteur, toute vibration du contact d'arc en forme de tige par rapport au coi de la buse de soufflage qu'il traverse.The idea underlying the invention is to limit or even eliminate, when the circuit breaker opens, any vibration of the arcing contact in the form of a rod relative to the coi of the blowing nozzle which it crosses .
A cet effet, l'invention a pour objet un disjoncteur de moyenne ou de haute tension qui comprend, à l'intérieur d'une chambre de coupure, un contact d'arc creux et un contact d'arc en forme de tige qui est inséré dans ledit contact creux suivant une direction axiale lorsque le disjoncteur est fermé, et une buse de soufflage qui est coaxiale et solidaire du contact d'arc creux et qui possède un col de buse traversé par le contact d'arc en forme de tige, le contact d'arc creux et la buse de soufflage d'une part, le contact d'arc en forme de tige d'autre part, étant déplacés suivant la direction axiale en sens opposés lors de l'ouverture du disjoncteur, caractérisé en ce que la buse de soufflage est guidée en translation le long du contact d'arc en forme de tige lors du déplacement en sens opposés des deux contacts d'arc. En guidant la buse de soufflage en translation le long du contact d'arc en forme de tige, on l'oblige à se déplacer sans vibrer par rapport à ce dernier, ce qui permet de réduire considérablement le risque d'un contact ou d'un frottement du col de la buse sur le contact d'arc. Le jeu entre ces deux éléments est ramené à une valeur qui permet d'augmenter la surpression du gaz diélectrique contenu dans la chambre d'expansion thermique tout en maintenant une même sécurité vis à vis du ré-amorçage de l'arc électrique. Il en résulte une augmentation de la capacité de coupure du disjoncteur à double mouvement.To this end, the invention relates to a medium or high voltage circuit breaker which comprises, inside a breaking chamber, a hollow arcing contact and an arcing contact in the form of a rod which is inserted into said hollow contact in an axial direction when the circuit breaker is closed, and a blowing nozzle which is coaxial and integral with the hollow arc contact and which has a nozzle neck crossed by the rod-shaped arc contact, the hollow arcing contact and the blowing nozzle on the one hand, the rod-shaped arcing contact on the other hand, being displaced in the axial direction in opposite directions when the circuit breaker opens, characterized in that that the blowing nozzle is guided in translation along the rod-shaped arcing contact when the two arcing contacts are moved in opposite directions. By guiding the blowing nozzle in translation along the rod-shaped arc contact, it is forced to move without vibrating relative to the latter, which considerably reduces the risk of contact or friction of the nozzle neck on the arcing contact. The play between these two elements is reduced to a value which makes it possible to increase the overpressure of the dielectric gas contained in the thermal expansion chamber while maintaining the same security with respect to the re-ignition of the electric arc. This results in an increase in the breaking capacity of the double movement circuit breaker.
De préférence, le guidage le long du contact d'arc en forme de tige est obtenu par l'intermédiaire d'une jupe cylindrique qui est fixée à la buse de soufflage pour coulisser à l'intérieur d'une couronne de guidage montée à l'intérieur d'un tube de contact principal solidaire du contact d'arc en forme de tige.Preferably, the guidance along the rod-shaped arc contact is obtained by means of a cylindrical skirt which is fixed to the blowing nozzle to slide inside a guide ring mounted on the inside a main contact tube secured to the rod-shaped arcing contact.
Selon un mode de réalisation avantageux, la jupe cylindrique est fixée par une extrémité à un divergent de la buse de soufflage et possède une autre extrémité libre. Cet agencement permet de créer une ligne de fuite suffisamment importante pour empêcher que l'arc électrique étiré entre les deux contacts d'arc chemine le long du divergent et de la jupe cylindrique en étant attiré par le contact principal.According to an advantageous embodiment, the cylindrical skirt is fixed by one end to a divergent part of the blowing nozzle and has another free end. This arrangement makes it possible to create a sufficiently large creepage distance to prevent the electric arc drawn between the two arcing contacts from traveling along the diverging part and of the cylindrical skirt while being attracted by the main contact.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description d'un mode de réalisation illustré par les dessins.Other characteristics and advantages of the invention will appear on reading the description of an embodiment illustrated by the drawings.
La figure 1 est une demi coupe axiale d'un disjoncteur à double mouvement en position fermée, dans lequel une buse de soufflage est guidée en translation par une jupe cylindrique.Figure 1 is an axial half section of a circuit breaker with double movement in the closed position, in which a blowing nozzle is guided in translation by a cylindrical skirt.
La figure 2 montre le disjoncteur de la figure 1 dans une position d'ouverture intermédiaire. La figure 3 montre le disjoncteur de la figure 1 dans une positon d'ouverture complète.Figure 2 shows the circuit breaker of Figure 1 in an intermediate open position. Figure 3 shows the circuit breaker of Figure 1 in a fully open position.
Un αisjoπcteur de moyenne ou de haute tension comprend, figure 1 une enveloppe isolante 1 formant une cnambre de couDure qui s'éteπc suivant une direction axiale A. Un premier contact principalA medium or high voltage isolator comprises, in FIG. 1, an insulating casing 1 forming a seam which expires in an axial direction A. A first main contact
3A et un crémier contact d'arc creux 3B sont portés par deux tubes coaxiaux 3C et 3D qui sont solidaires et mobiles suivant la direction axiale A. Un organe de manoeuvre non représenté déplace en translation les deux tubes 3C et 3D qui coulissent par rapport à deux tubes ccaxiaux 7A et 7B d'un support fixe 7 par l'intermédiaire de contacts glissants 7C.3A and a hollow arc contact creamer 3B are carried by two coaxial tubes 3C and 3D which are integral and movable in the axial direction A. An actuator not shown moves in translation the two tubes 3C and 3D which slide relative to two ccaxial tubes 7A and 7B of a fixed support 7 by means of sliding contacts 7C.
De manière connue, les deux tubes coaxiaux 3C et 3D forment une cnamDre de compression 3E qui communique avec la chambre de coupure oar l'intermédiaire d'une ouverture 7D formée à une extrémité 7E de l'un 7B des tubes du support fixe 7, et d'ouvertures 7F et 7G formées respectivement dans les deux tubes 7A et 7B du support fixe 7. Un gaz diélectrique du type azote N2 ou hexafluorure de soufre SF6 est présent dans la chambre de coupure sous une pression de quelques cars et circule à l'intérieur de la chambre de compression par l'intermédiaire des ouvertures.In a known manner, the two coaxial tubes 3C and 3D form a compression channel 3E which communicates with the interrupting chamber through an opening 7D formed at one end 7E of one of the tubes of the fixed support 7, and openings 7F and 7G formed respectively in the two tubes 7A and 7B of the fixed support 7. A dielectric gas of nitrogen type N 2 or sulfur hexafluoride SF 6 is present in the breaking chamber under a pressure of a few cars and circulates inside the compression chamber through the openings.
Le αisicncteur comprend un deuxième contact principal 5A et un deuxième contact d'arc en forme de tige 5B qui sont portés respectivement par un tube 5C et un cône 5D coaxiaux qui sont solidaires et mobiles suivant la direction axiale A. Lorsαue ie disjoncteur est en position fermée, le contact d'arc en forme αe tige est inséré dans le contact d'arc creux suivant la direction axiale A.The αisicnctor comprises a second main contact 5A and a second arcing contact in the form of a rod 5B which are carried respectively by a tube 5C and a cone 5D coaxial which are integral and movable in the axial direction A. When the circuit breaker is in position closed, the rod-shaped arcing contact is inserted into the hollow arcing contact in the axial direction A.
Le contact principal 3A porte une buse de soufflage 9 qui possède ur, col de buse 9A traversé avec un jeu par le contact d'arc en forme ce tige 5B pour fermer une chambre d'expansion thermique 3H déiimitée par la buse de soufflage 9 et les contacts principal 3A et d'arc 3B. La chambre d'expansion thermique 3H communique avec la chambre de compression 3E par l'intermédiaire d'une ouverture 31 formée dans un piston 3J solidaire des deux tubes coaxiaux 3C et 3D. Le disjoncteur est à double mouvement pour minimiser la dépense d'énergie de l'organe de manoeuvre. Lors de l'ouverture du disjoncteur, le contact principal 3A et le contact d'arc creux 3B sont déplacés solidairement suivant la direction axiale A vers la droite sur la figure 1 , pour être séparés respectivement du contact principal 5A et du contact d'arc en forme de tige 5B qui sont déplacés solidairement suivant la direction axiale A en sens opposé, vers la gauche sur la figure 1.The main contact 3A carries a blowing nozzle 9 which has ur, nozzle neck 9A crossed with a clearance by the arc contact in the form of this rod 5B to close a thermal expansion chamber 3H delimited by the blowing nozzle 9 and the main contacts 3A and arcing 3B. The thermal expansion chamber 3H communicates with the compression chamber 3E via an opening 31 formed in a piston 3J secured to the two coaxial tubes 3C and 3D. The circuit breaker is double-movement to minimize the energy expenditure of the operating member. When the circuit breaker opens, the main contact 3A and the hollow arcing contact 3B are moved integrally in the axial direction A to the right in FIG. 1, to be separated from the main contact 5A and the arcing contact respectively in the form of a rod 5B which are moved integrally in the axial direction A in the opposite direction, to the left in FIG. 1.
Le déplacement du piston 3J entraîne une compression du gaz diélectrique contenu dans la chambre de compression 3E. L'élévation de pression se transmet au gaz diélectrique contenu dans la chambre d'extension thermique 3H et est renforcée par l'élévation de température due à la formation d'un arc électrique étiré entre les deux contacts d'arc 3B et 5B après leur séparation. Lorsque le contact d'arc en forme de tige 5B sort du col 9A de la buse de soufflage 9, le gaz diélectrique est soufflé sur l'arc électrique pour l'éteindre lors d'un passage par zéro du courant de coupure.The displacement of the piston 3J causes compression of the dielectric gas contained in the compression chamber 3E. The pressure rise is transmitted to the dielectric gas contained in the thermal extension chamber 3H and is reinforced by the temperature rise due to the formation of an electric arc drawn between the two arcing contacts 3B and 5B after their separation. When the rod-shaped arcing contact 5B comes out of the neck 9A of the blowing nozzle 9, the dielectric gas is blown on the electric arc to extinguish it during a zero crossing of the breaking current.
Selon l'invention, la buse de soufflage 9 est déplacée solidairement du contact d'arc creux 3B en étant guidée en translation suivant la direction axiale A le long du contact d'arc en forme de tige 5B.According to the invention, the blowing nozzle 9 is moved integrally from the hollow arc contact 3B while being guided in translation in the axial direction A along the rod-shaped arc contact 5B.
Figure 1 , le guidage en translation est obtenu par l'intermédiaire d'une jupe cylindrique isolante 11 qui est fixée à la buse de soufflage 9 pour coulisser à l'intérieur d'une couronne de guidage 5E fixée de façon radiale à l'intérieur du contact principal 5A solidaire du contact d'arc en forme de tige 5B. Comme indiqué précédemment, en guidant la buse de soufflage 9 en translation suivant la direction axiaie A à l'aide du contact principal' 5A, on l'oblige, lors de l'ouverture du disjoncteur, à se déplacer sans vibrer par rapport au contact d'arc en forme de tige 5B solidaire de ce contact principal 5A. Cela permet de réduire considérablement le risque d'un contact ou d'un frottement du col 9A de la buse sur le contact d'arc 5B. Le jeu entre ces deux éléments 9A et 5B est ramené à une valeur qui permet d'augmenter la surpression du gaz diélectrique contenu dans la chambre d'expansion thermique 3H tout en maintenant une même sécurité vis à vis du ré-amorçage de l'arc électrique. Il en résulte une augmentation de la capacité de coupure du disjoncteur à double mouvement.Figure 1, the guiding in translation is obtained by means of an insulating cylindrical skirt 11 which is fixed to the blowing nozzle 9 to slide inside a guide ring 5E fixed radially inside of the main contact 5A integral with the arcing contact in the form of a rod 5B. As indicated above, by guiding the blowing nozzle 9 in translation in the axial direction A using the main contact ' 5A, it is forced, when the circuit breaker opens, to move without vibrating relative to the contact arc shaped rod 5B integral with this main contact 5A. This makes it possible to considerably reduce the risk of contact or friction of the neck 9A of the nozzle on the arcing contact 5B. The clearance between these two elements 9A and 5B is reduced to a value which makes it possible to increase the overpressure of the dielectric gas contained in the thermal expansion chamber 3H while maintaining the same safety with regard to the re-ignition of the arc electric. This results in an increase in the breaking capacity of the double movement circuit breaker.
A titre d'exemple, le disjoncteur possède un jeu de l'ordre de 0,5 millimètres (mm), à comparer avec un jeu de l'ordre de 2 mm dans un disjoncteur selon l'art antérieur.By way of example, the circuit breaker has a clearance of the order of 0.5 millimeters (mm), to be compared with a clearance of the order of 2 mm in a circuit breaker according to the prior art.
Figure 2, le disjoncteur est ouvert dans une position intermédiaire qui correspond à la séparation des contacts d'arc 3B et 5B après la séparation des contacts principaux 3A et 5A. Un arc électrique non représenté est étiré entre les deux contact d'arc 3B et 5B. La buse de soufflage 9 a été déplacée solidairement du contact principal 3A en étant guidée en translation le long du contact d'arc en forme de tige 5B par la jupe cylindrique 11 qui coulisse à l'intérieur de la couronne de guidage 5E.Figure 2, the circuit breaker is open in an intermediate position which corresponds to the separation of the arcing contacts 3B and 5B after the separation of the main contacts 3A and 5A. An electric arc, not shown, is drawn between the two arcing contacts 3B and 5B. The blowing nozzle 9 has been moved integrally from the main contact 3A while being guided in translation along the rod-shaped arc contact 5B by the cylindrical skirt 11 which slides inside the guide ring 5E.
Le jeu réduit qui existe entre le col 9A de la buse de soufflage 9 et le contact d'arc SB de l'équipage semi mobile 5 permet d'atteindre une surpression du gaz diélectrique dans la chambre d'extension thermique 3H plus importante que dans l'art antérieur. Il en résulte une plus grande efficacité du soufflage de l'arc électrique en vue de couper des courants électriques alternatifs de plus forte intensité. Selon un mode de réalisation avantageux de l'invention, la jupe cylindrique 11 est fixée par une extrémité 11 B à un divergent 9C de la buse de soufflage 9, et possède une autre extrémité libre 11C. Cet agencement permet de créer une ligne de fuite suffisamment importante pour empêcher que l'arc électrique étiré entre les deux contacts d'arc 3B et 5B ne chemine le long du divergent 9C et de la jupe cylindrique 11 en étant attiré par le contact principal 5A de l'équipage semi mobile 5 par l'intermédiaire de la couronne de guidage 5E. Figure 3, le disjoncteur est ouvert dans une position qui correspond à une course complète de séparation des contacts principaux 3A et 5A. L'arc électrique étiré entre les deux contacts d'arc 3B et 5B a été soufflé par le gaz diélectrique comprimé dans la chambre d'extension thermique 3H. La buse de soufflage 9 a été guidée en translation par la jupe cylindrique 11 suivant la direction axiale A. De préférence, la jupe cylindrique 11 s'étend sur une longueur suffisante pour guider la buse de soufflage 9 jusqu'au retrait du contact d'arc en forme de tige 5B hors du col de la buse 9A. The reduced clearance which exists between the neck 9A of the blowing nozzle 9 and the arcing contact SB of the semi-mobile assembly 5 makes it possible to achieve a higher pressure of the dielectric gas in the thermal extension chamber 3H than in prior art. This results in greater efficiency of blowing the electric arc in order to cut alternating electric currents of higher intensity. According to an advantageous embodiment of the invention, the cylindrical skirt 11 is fixed by one end 11 B to a divergent 9C of the blowing nozzle 9, and has another free end 11C. This arrangement makes it possible to create a sufficiently large creepage distance to prevent the electric arc drawn between the two arcing contacts 3B and 5B from traveling along the divergent 9C and the cylindrical skirt 11 while being attracted by the main contact 5A of the semi-mobile equipment 5 via the guide ring 5E. Figure 3, the circuit breaker is open in a position which corresponds to a complete separation stroke of the main contacts 3A and 5A. The electric arc drawn between the two arcing contacts 3B and 5B was blown away by the compressed dielectric gas in the thermal extension chamber 3H. The blowing nozzle 9 has been guided in translation by the cylindrical skirt 11 in the axial direction A. Preferably, the cylindrical skirt 11 extends over a length sufficient to guide the blowing nozzle 9 until the contact is removed. rod-shaped arc 5B outside the neck of nozzle 9A.

Claims

REVENDICATIONS
1. Un disjoncteur de moyenne ou de haute tension qui comprend, à l'intérieur d'une chambre de coupure, un contact d'arc creux (3B) et un contact d'arc en forme de tige (5B) qui est inséré dans ledit contact creux (3B) suivant une direction axiale (A) lorsque le disjoncteur est fermé, et une buse de soufflage (9) qui est coaxiale et solidaire du contact d'arc creux (3B) et qui possède un col de buse (9A) traversé par le contact d'arc en forme de tige (5B), le contact d'arc creux (3B) et la buse de soufflage (9) d'une part, le contact d'arc en forme de tige (5B) d'autre part, étant déplacés suivant la direction axiale (A) en sens opposés lors de l'ouverture du disjoncteur, caractérisé en ce que la buse de soufflage (9) est guidée en translation le long du contact d'arc en forme de tige (5B) lors du déplacement en sens opposés des deux contacts d'arc (3B, 5B), par une jupe cylindrique isolante (11) fixée à la buse de soufflage (9) et coulissant à l'intérieur d'une couronne de guidage (5E) montée à l'intérieur d'un tube de contact principal (5A) solidaire du contact d'arc en forme de tige (5B).1. A medium or high voltage circuit breaker which comprises, inside a breaking chamber, a hollow arcing contact (3B) and a rod-shaped arcing contact (5B) which is inserted in said hollow contact (3B) in an axial direction (A) when the circuit breaker is closed, and a blowing nozzle (9) which is coaxial and integral with the hollow arc contact (3B) and which has a nozzle neck (9A ) crossed by the rod-shaped arcing contact (5B), the hollow arcing contact (3B) and the blowing nozzle (9) on the one hand, the rod-shaped arcing contact (5B) on the other hand, being moved in the axial direction (A) in opposite directions during the opening of the circuit breaker, characterized in that the blowing nozzle (9) is guided in translation along the arc-shaped contact rod (5B) during the displacement in opposite directions of the two arcing contacts (3B, 5B), by an insulating cylindrical skirt (11) fixed to the blowing nozzle (9) and sliding inside a courtyard guide rod (5E) mounted inside a main contact tube (5A) integral with the rod-shaped arcing contact (5B).
2. Un disjoncteur selon la revendication 1 , dans lequel la jupe cylindrique isolante (1 1 ) est fixée par une extrémité (1 1 B) à un divergent (9C) de la buse de soufflage (9) et possède une autre extrémité libre (1 1 C).2. A circuit breaker according to claim 1, in which the insulating cylindrical skirt (1 1) is fixed by one end (1 1 B) to a divergent (9C) of the blowing nozzle (9) and has another free end ( 1 1 C).
3. Un disjoncteur selon la revendication 1 ou 2, dans lequel la jupe cylindrique (1 1 ) s'étend suivant la direction axiaie (A) sur une longueur de guidage de la buse de soufflage (9) jusqu'au retrait du contact d'arc en forme de tige (5B) hors du col de la buse (9A). 3. A circuit breaker according to claim 1 or 2, wherein the cylindrical skirt (1 1) extends in the axial direction (A) over a guide length of the blowing nozzle (9) until the contact is removed. 'rod-shaped arc (5B) out of the nozzle neck (9A).
PCT/FR1999/001337 1998-06-08 1999-06-07 High and medium voltage circuit breaker with double movement comprising a blower tube guided in translation WO1999065048A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2000553970A JP2002518787A (en) 1998-06-08 1999-06-07 Dual-motion high and medium-voltage circuit breakers with air ducts guided in translation
CA002334991A CA2334991A1 (en) 1998-06-08 1999-06-07 High and medium voltage circuit breaker with double movement comprising a blower tube guided in translation
KR1020007013867A KR20010052638A (en) 1998-06-08 1999-06-07 High and medium voltage circuit breaker with double movement comprising a blower tube guided in translation
EP99923684A EP1093659A1 (en) 1998-06-08 1999-06-07 High and medium voltage circuit breaker with double movement comprising a blower tube guided in translation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9807181A FR2779566B1 (en) 1998-06-08 1998-06-08 DOUBLE MOTION HIGH OR MEDIUM VOLTAGE CIRCUIT BREAKER INCLUDING A TRANSLATION-GUIDED BLOWER NOZZLE
FR98/07181 1998-06-08

Publications (1)

Publication Number Publication Date
WO1999065048A1 true WO1999065048A1 (en) 1999-12-16

Family

ID=9527135

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1999/001337 WO1999065048A1 (en) 1998-06-08 1999-06-07 High and medium voltage circuit breaker with double movement comprising a blower tube guided in translation

Country Status (8)

Country Link
EP (1) EP1093659A1 (en)
JP (1) JP2002518787A (en)
KR (1) KR20010052638A (en)
CA (1) CA2334991A1 (en)
FR (1) FR2779566B1 (en)
ID (1) ID28154A (en)
TW (1) TW417125B (en)
WO (1) WO1999065048A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29709084U1 (en) * 1996-08-01 1997-08-14 Aeg Energietechnik Gmbh Gas pressure switch
EP0809269A2 (en) * 1996-05-24 1997-11-26 Siemens Aktiengesellschaft High voltage circuit breaker with two driven switch contact pieces

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0809269A2 (en) * 1996-05-24 1997-11-26 Siemens Aktiengesellschaft High voltage circuit breaker with two driven switch contact pieces
DE29709084U1 (en) * 1996-08-01 1997-08-14 Aeg Energietechnik Gmbh Gas pressure switch

Also Published As

Publication number Publication date
CA2334991A1 (en) 1999-12-16
TW417125B (en) 2001-01-01
ID28154A (en) 2001-05-10
KR20010052638A (en) 2001-06-25
EP1093659A1 (en) 2001-04-25
JP2002518787A (en) 2002-06-25
FR2779566B1 (en) 2000-06-30
FR2779566A1 (en) 1999-12-10

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