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EP0538157A1 - Hybrid circuit-breaker with axial blow-out coil - Google Patents

Hybrid circuit-breaker with axial blow-out coil Download PDF

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Publication number
EP0538157A1
EP0538157A1 EP92420362A EP92420362A EP0538157A1 EP 0538157 A1 EP0538157 A1 EP 0538157A1 EP 92420362 A EP92420362 A EP 92420362A EP 92420362 A EP92420362 A EP 92420362A EP 0538157 A1 EP0538157 A1 EP 0538157A1
Authority
EP
European Patent Office
Prior art keywords
coil
contacts
circuit breaker
cartridge
arcing
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.)
Granted
Application number
EP92420362A
Other languages
German (de)
French (fr)
Other versions
EP0538157B1 (en
Inventor
Roger Bolongeat-Mobleu
Olivier Cardoletti
Peter Malkin
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.)
Schneider Electric SE
Original Assignee
Merlin Gerin SA
Schneider Electric SE
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 Merlin Gerin SA, Schneider Electric SE filed Critical Merlin Gerin SA
Publication of EP0538157A1 publication Critical patent/EP0538157A1/en
Application granted granted Critical
Publication of EP0538157B1 publication Critical patent/EP0538157B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • 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
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H01H33/6641—Contacts; Arc-extinguishing means, e.g. arcing rings making use of a separate coil
    • 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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121—Load break switches
    • H01H33/122—Load break switches both breaker and sectionaliser being enclosed, e.g. in SF6-filled container

Definitions

  • the invention relates to a medium-voltage electrical circuit breaker comprising a sealed enclosure filled with a gas with high dielectric strength such as sulfur hexafluoride, a pair of main contacts disposed in said enclosure, a vacuum cartridge with a closed cylindrical envelope by two bottoms, disposed in said enclosure and containing a pair of aligned arcing contacts, electrically connected in parallel with said main contacts, a control mechanism for said contacts for opening the arcing contacts after the main contacts and closing them before the contacts main, and a coil producing an axial magnetic field in the arcing area, drawn inside the cartridge during the separation of the arcing contacts.
  • a gas with high dielectric strength such as sulfur hexafluoride
  • a known circuit breaker (document FR-A-2,655,766) of the kind mentioned, comprises an axial blowing coil, incorporated in the cartridge and produced by notches made in the bottom of this cartridge.
  • the production of this part is delicate and only a fraction of the current flows through the spiral path constituting the coil.
  • the spectrum of the magnetic field generated by the coil is not ideal and the need has arisen to have a simplified device with improved performance.
  • the electric circuit breaker according to the invention is characterized in that said ring-shaped coil is arranged coaxially outside the vacuum cartridge in said enclosure in line with the separation interval of the arcing contacts in the open position , that the diameter of the coil is less than the diameter of said envelope and that the bottom adjacent to the coil is shaped and associated with the coil to internally cover the latter.
  • the coil By placing the coil outside the vacuum cartridge, the internal parts of the latter are considerably simplified, and the coil can be placed in line with the contact separation interval to generate an ideal magnetic field in the area of break.
  • Vacuum cartridges having a coil outside the cartridge are already known, but the coil is always arranged around the cylindrical insulating envelope. The presence of this coil around the insulating envelope creates dielectric problems due to the capacitive shorting of the insulating envelope by the coil. It is also very difficult to rigidly fix this coil which is subjected to significant electromagnetic forces, the usual coating solution having the drawback of limiting the dissipation of the heat generated by the cartridge, and of increasing the size of the latter.
  • the coil in a housing, formed in the bottom of the cartridge overcomes the problems of mechanical fixing, and dielectric strength.
  • the arcing contacts of the vacuum cartridge are arranged in the center of the coil and the field generated by the latter is axial over the entire extent of the contacts.
  • the bottom receiving the coil is advantageously the bottom of the cartridge disposed on the side of the fixed contact and this bottom, made of a metallic or insulating material, is shaped like a bell covering with the fixed arcing contact.
  • the section of the housing made in the bottom is of course adapted to the shape of the coil and this housing is open on the side of the fixed arcing contact to allow the insertion of the coil in this housing.
  • the assembly is cylindrical in shape and the outer wall of the housing is extended to the vicinity of the end of the cartridge, where this outer wall is connected to the insulating cylindrical envelope of the cartridge.
  • This keeps the insulation length of the vacuum cartridge, which is adapted to the dielectric strength in the hexafluoride sulfur.
  • the coil advantageously carries a single turn inserted with little play in the housing provided in the bottom, and having two ends respectively connected to the fixed arcing contacts and to the current supply, in this case to one of the main contacts. .
  • the ends of the coil contribute to the mechanical maintenance of the latter, and they extend parallel to the bell-shaped bottom, towards the axis of the cartridge to be mechanically fixed in contact with a fixed arc.
  • the electrical insulation of the power supply end is isolated by simple insulating washers and the two coil ends are slightly angularly offset to avoid electrical contact.
  • Figure 1 is a schematic view in axial section of a circuit breaker according to the invention.
  • FIG. 2 is an enlarged view of the vacuum cartridge according to FIG. 1.
  • FIG. 3 is a schematic plan view of the vacuum cartridge according to FIG. 2.
  • Figure 4 is a partial view of Figure 2, illustrating an alternative embodiment.
  • Figure 1 which corresponds substantially to the figure of the aforementioned French patent, illustrates the general structure of the hybrid circuit breaker comprising a sealed enclosure 10, filled with a gas with high dielectric strength, such as sulfur hexafluoride.
  • a gas with high dielectric strength such as sulfur hexafluoride.
  • the set is ordered by a mechanism 14 causing the opening of the main contacts 11,12 before the opening of the arcing contacts 15,16 of the vacuum cartridge 13.
  • the vacuum cartridge 13 comprises a cylindrical envelope 17 made of glass or ceramic material closed by two bottoms 18,19. Inside the cartridge 13 are arranged on the bottom side 19, the fixed contact 15, and on the bottom side 18, the movable contact 16 carried by the control rod 20 which crosses the bottom 18 in a sealed manner.
  • the arcing contacts 15 and 16 are disc-shaped in a material of high resistivity.
  • the bottom 19 has an annular groove 21 extending to the base of the separation gap of the arcing contacts 15, 16 in the open position. This groove 21 open upwards in FIG. 2 allows the insertion of an annular coil 22 which is housed in the bottom of the groove 21, so as to coaxially surround the separation interval of the contacts 15, 16.
  • the arcing contacts 15,16 are arranged in the center of the coil 22, and it is easy to see that the magnetic field generated by the current flowing through this coil 22 is axial over the entire extent of the arcing contacts 15.16.
  • the coil 22 is inserted with little play in the groove 21 which holds it mechanically.
  • the bottom 19 is bell-shaped covering the fixed arcing contact 15 and internally sheathing the coil 22, the lower edge 23 of this bell being curved to form a cylindrical wall 24 of external sheathing of the coil 22.
  • This external wall 24 can extend to the level of the bottom 19, as shown in Figure 2 and connect at this location to the insulating cylindrical shell 17. The height of this outer wall 24 can also be reduced if the dielectric strength is sufficient .
  • the assembly has an axial symmetry and in a preferred embodiment, the bottom 18 associated with the movable contact has a shape similar to that of the bottom 19 associated with the fixed contact, the corresponding groove being in this case unused.
  • the bottoms 18.19 are metallic, and the insulation is ensured by the cylindrical envelope 17. It is clear that the bottoms 18 and or 19 can be insulating and contribute or ensure the holding dielectric of the cartridge 13 in sulfur hexafluoride.
  • the coil 22 is a single turn of rectangular section having two ends 25, 26, substantially parallel to the bottom 19 so as to leave the groove 21 and extend radially in the direction of the axis of the vacuum cartridge 13.
  • L end 25 is pressed against the fixed arcing contact 15 and has a hole 27 for the passage of a fixing screw 28.
  • the other end 26 arranged as a current supply conductor is superimposed on end 25, in being insulated from the latter by insulating washers 29.
  • the screw 28 passes through an enlarged orifice 30 to secure, by screwing in a threaded orifice of the fixed arcing contact 15, the two ends 25, 26 to the fixed arcing contact 15.
  • the ends 25, 26 thus contribute to maintaining the turn 22 in the groove 21 in a particularly simple manner. It can be seen that the current supplied by the end 26 flows through the turn 22 before reaching the fixed arcing contact 15, and thus generates the axial magnetic field in the separation zone of the arcing contacts 15,16.
  • FIG. 4 illustrates an alternative embodiment in which the coil 22 is arranged at the bottom 19 with a slight upward offset, with respect to the separation interval of the arcing contacts 15, 16.
  • the spectrum of the magnetic field generated by the coil 22 is no longer absolutely ideal since it has a slight radial component, but the reduction in the depth of the groove 21 facilitates the production of the bottom 19.
  • the advantages of mechanical shrinking of the coil 22 are on the other hand entirely preserved.
  • the structure of the vacuum cartridge 13 is extremely simple.
  • the invention is of course in no way limited to the mode of implementation more particularly described, and it extends to contrary to all variants remaining within the framework of equivalences, in particular to that in which the coil would comprise several turns, or that still where the coil would be incorporated in a closed groove, either during manufacture, or by subsequent coating.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Circuit Breakers (AREA)

Abstract

An evacuated cartridge (13) of a hybrid circuit breaker includes an end (19) having a groove (21) for housing an annular coil (22) outside the cartridge and connected electrically in series with the contacts (15,16) of the cartridge (13). The coil (22) is arranged in line with the arc contacts (15,16) and is held rigidly by the groove (21). <IMAGE>

Description

L'invention est relative à un disjoncteur électrique moyenne tension comprenant une enceinte étanche remplie d'un gaz à rigidité diélectrique élevée tel que l'hexafluorure de soufre, une paire de contacts principaux disposés dans ladite enceinte, une cartouche à vide à enveloppe cylindrique obturée par deux fonds, disposée dans ladite enceinte et contenant une paire de contacts d'arc alignés, connectés électriquement en parallèle desdits contacts principaux, un mécanisme de commande desdits contacts pour ouvrir les contacts d'arc après les contacts principaux et les fermer avant les contacts principaux, et une bobine produisant un champ magnétique axial dans la zone de formation d'un arc,tiré à l'intérieur de la cartouche lors de la séparation des contacts d'arc.The invention relates to a medium-voltage electrical circuit breaker comprising a sealed enclosure filled with a gas with high dielectric strength such as sulfur hexafluoride, a pair of main contacts disposed in said enclosure, a vacuum cartridge with a closed cylindrical envelope by two bottoms, disposed in said enclosure and containing a pair of aligned arcing contacts, electrically connected in parallel with said main contacts, a control mechanism for said contacts for opening the arcing contacts after the main contacts and closing them before the contacts main, and a coil producing an axial magnetic field in the arcing area, drawn inside the cartridge during the separation of the arcing contacts.

Un disjoncteur connu (document FR-A-2.655.766) du genre mentionné, comporte une bobine de soufflage axial, incorporée à la cartouche et réalisée par des entailles ménagées dans le fond de cette cartouche. La réalisation de cette pièce est délicate et seule une fraction du courant parcourt la trajectoire spiroïdale constituant la bobine. Le spectre du champ magnétique engendré par la bobine n'est pas idéal et le besoin s'est fait sentir de disposer d'un dispositif simplifié à performances améliorées.A known circuit breaker (document FR-A-2,655,766) of the kind mentioned, comprises an axial blowing coil, incorporated in the cartridge and produced by notches made in the bottom of this cartridge. The production of this part is delicate and only a fraction of the current flows through the spiral path constituting the coil. The spectrum of the magnetic field generated by the coil is not ideal and the need has arisen to have a simplified device with improved performance.

Il a déjà été proposé de conformer les pièces de contacts pour imposer une trajectoire du courant en forme de spire, pour engendrer le champ magnétique dans la zone d'arc. Cette solution présente les inconvénients précités de pièces complexes et d'un spectre de champ magnétique imparfait.It has already been proposed to conform the contact pieces to impose a current trajectory in the form of a turn, to generate the magnetic field in the arc zone. This solution has the aforementioned drawbacks of complex parts and an imperfect magnetic field spectrum.

Le disjoncteur électrique selon l'invention est caractérisé en ce que ladite bobine en forme d'anneau est disposée coaxialement à l'extérieur de la cartouche à vide dans ladite enceinte au droit de l'intervalle de séparation des contacts d'arc en position ouvert, que le diamètre de la bobine est inférieur au diamètre de ladite enveloppe et que le fond adjacent à la bobine est conformé et associé à la bobine pour gainer intérieurement cette dernière.The electric circuit breaker according to the invention is characterized in that said ring-shaped coil is arranged coaxially outside the vacuum cartridge in said enclosure in line with the separation interval of the arcing contacts in the open position , that the diameter of the coil is less than the diameter of said envelope and that the bottom adjacent to the coil is shaped and associated with the coil to internally cover the latter.

En plaçant la bobine à l'extérieur de la cartouche à vide, les pièces internes à cette dernière sont notablement simplifiées, et la bobine peut être disposée au droit de l'intervalle de séparation des contacts pour engendrer un champ magnétique idéal dans la zone de coupure. Les cartouches à vide ayant une bobine extérieure à la cartouche sont déjà connues, mais la bobine est toujours disposée autour de l'enveloppe cylindrique isolante. La présence de cette bobine autour de l'enveloppe isolante crée des problèmes diélectriques dus au court-circuitage capacitif de l'enveloppe isolante par la bobine. Il est d'autre part très difficile de fixer rigidement cette bobine qui est soumise à des forces électromagnétiques importantes, la solution usuelle d'enrobage ayant l'inconvénient de limiter la dissipation de la chaleur engendrée par la cartouche, et d'augmenter l'encombrement de cette dernière.By placing the coil outside the vacuum cartridge, the internal parts of the latter are considerably simplified, and the coil can be placed in line with the contact separation interval to generate an ideal magnetic field in the area of break. Vacuum cartridges having a coil outside the cartridge are already known, but the coil is always arranged around the cylindrical insulating envelope. The presence of this coil around the insulating envelope creates dielectric problems due to the capacitive shorting of the insulating envelope by the coil. It is also very difficult to rigidly fix this coil which is subjected to significant electromagnetic forces, the usual coating solution having the drawback of limiting the dissipation of the heat generated by the cartridge, and of increasing the size of the latter.

En disposant selon l'invention, la bobine dans un logement, ménagé dans le fond de la cartouche, on s'affranchit des problèmes de fixation mécanique, et de tenue diélectrique. Les contacts d'arc de la cartouche à vide sont disposés au centre de la bobine et le champ engendré par cette dernière est axial sur toute l'étendue des contacts. Le fond recevant la bobine est avantageusement le fond de la cartouche disposé du côté du contact fixe et ce fond, en un matériau métallique ou isolant est conformé en forme de cloche coiffant avec'eu le contact d'arc fixe. La section du logement pratiquée dans le fond est bien entendu adaptée à la forme de la bobine et ce logement est ouvert du côté du contact d'arc fixe pour permettre l'insertion de la bobine dans ce logement. L'ensemble est de forme cylindrique et la paroi externe du logement est prolongée jusqu'au voisinage de l'extrémité de la cartouche,où cette paroi externe se raccorde à l'enveloppe cylindrique isolante de la cartouche. On conserve ainsi la longueur d'isolation de la cartouche à vide, laquelle est adaptée à la tenue diélectrique dans l'hexafluorure de soufre. La bobine porte avantageusement une spire unique insérée à faible jeu dans le logement ménagé dans le fond, et ayant deux extrémités respectivement raccordées aux contacts d'arc fixes et à l'amenée du courant, en l'occurrence à l'un des contacts principaux. Les extrémités de la spire contribuent au maintien mécanique de cette dernière, et elles s'étendent parallèlement au fond en forme de cloche, en direction de l'axe de la cartouche pour être mécaniquement fixées au contact d'arc fixe. L'isolation électrique de l'extrémité d'amenée de courant est isolée par de simples rondelles isolantes et les deux extrémités de bobine sont légèrement décalées angulairement pour éviter tout contact électrique.By having according to the invention, the coil in a housing, formed in the bottom of the cartridge, it overcomes the problems of mechanical fixing, and dielectric strength. The arcing contacts of the vacuum cartridge are arranged in the center of the coil and the field generated by the latter is axial over the entire extent of the contacts. The bottom receiving the coil is advantageously the bottom of the cartridge disposed on the side of the fixed contact and this bottom, made of a metallic or insulating material, is shaped like a bell covering with the fixed arcing contact. The section of the housing made in the bottom is of course adapted to the shape of the coil and this housing is open on the side of the fixed arcing contact to allow the insertion of the coil in this housing. The assembly is cylindrical in shape and the outer wall of the housing is extended to the vicinity of the end of the cartridge, where this outer wall is connected to the insulating cylindrical envelope of the cartridge. This keeps the insulation length of the vacuum cartridge, which is adapted to the dielectric strength in the hexafluoride sulfur. The coil advantageously carries a single turn inserted with little play in the housing provided in the bottom, and having two ends respectively connected to the fixed arcing contacts and to the current supply, in this case to one of the main contacts. . The ends of the coil contribute to the mechanical maintenance of the latter, and they extend parallel to the bell-shaped bottom, towards the axis of the cartridge to be mechanically fixed in contact with a fixed arc. The electrical insulation of the power supply end is isolated by simple insulating washers and the two coil ends are slightly angularly offset to avoid electrical contact.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre, d'un mode de mise en oeuvre de l'invention, donné à titre d'exemple non limitatif , et représenté aux dessins annexés dans lesquels:Other advantages and characteristics will emerge more clearly from the description which follows, of an embodiment of the invention, given by way of nonlimiting example, and represented in the appended drawings in which:

La figure 1 est une vue schématique en coupe axiale d'un disjoncteur selon l'invention.Figure 1 is a schematic view in axial section of a circuit breaker according to the invention.

La figure 2 est une vue à échelle agrandie de la cartouche à vide selon la figure 1.FIG. 2 is an enlarged view of the vacuum cartridge according to FIG. 1.

La figure 3 est une vue schématique en plan de la cartouche à vide selon la figure 2.FIG. 3 is a schematic plan view of the vacuum cartridge according to FIG. 2.

La figure 4 est une vue partielle de la figure 2, illustrant une variante de réalisation.Figure 4 is a partial view of Figure 2, illustrating an alternative embodiment.

La figure 1 qui correspond sensiblement à la figure du brevet français précité, illustre la structure générale du disjoncteur hybride comprenant une enceinte étanche 10, remplie d'un gaz à rigidité diélectrique élevée, tel que l'hexafluorure de soufre. Dans l'enceinte 10 sont logés des contacts principaux 11,12 et une cartouche à vide 13 connnectée électriquement en parallèle des contacts principaux 11,12. L'ensemble est commandé par un mécanisme 14 provoquant l'ouverture des contacts principaux 11,12 avant l'ouverture des contacts d'arc 15,16 de la cartouche à vide 13. On se reportera au brevet français précité pour de plus amples détails, sur la structure et le fonctionnement de ce disjoncteur hybride.Figure 1 which corresponds substantially to the figure of the aforementioned French patent, illustrates the general structure of the hybrid circuit breaker comprising a sealed enclosure 10, filled with a gas with high dielectric strength, such as sulfur hexafluoride. In the enclosure 10 are housed main contacts 11,12 and a vacuum cartridge 13 electrically connected in parallel with the main contacts 11,12. The set is ordered by a mechanism 14 causing the opening of the main contacts 11,12 before the opening of the arcing contacts 15,16 of the vacuum cartridge 13. Reference is made to the aforementioned French patent for more details, on the structure and the operation of this hybrid circuit breaker.

En se référant plus particulièrement à la figure 2, on voit que la cartouche à vide 13 comporte une enveloppe cylindrique 17 en verre ou en matière céramique obturée par deux fonds 18,19. A l'intérieur de la cartouche 13 sont disposés du côté du fond 19, le contact fixe 15, et du côté du fond 18, le contact mobile 16 porté par la tige de comande 20 qui traverse d'une manière étanche le fond 18. Les contacts d'arc 15 et 16 sont en forme de disque en un matériau de forte résistivité. Le fond 19 présente une gorge annulaire 21 s'étendant jusqu'à la base de l'intervalle de séparation des contacts d'arc 15,16 en position ouvert. Cette gorge 21 ouverte vers le haut sur la figure 2, permet l'insertion d'une bobine annulaire 22 venant se loger dans le fond de la gorge 21, de manière à entourer coaxialement l'intervalle de séparation des contacts 15,16. Les contacts d'arc 15,16 sont disposés au centre de la bobine 22, et il est facile de voir que le champ magnétique engendré par le courant parcourant cette bobine 22 est axial sur l'ensemble de l'étendue des contacts d'arc 15,16. La bobine 22 est insérée à faible jeu dans la gorge 21 qui la maintient mécaniquement. Le fond 19 est en forme de cloche coiffant le contact d'arc fixe 15 et gainant intérieurement la bobine 22, le bord inférieur 23 de cette cloche étant recourbé pour constituer une paroi 24 cylindrique de gainage externe de la bobine 22. Cette paroi externe 24 peut se prolonger jusqu'au niveau du fond 19, de la manière représentée sur la figure 2 et se raccorder à cet emplacement à l'enveloppe cylindrique isolante 17. La hauteur de cette paroi externe 24 peut également être réduite si la tenue diélectrique est suffisante. L'ensemble présente une symétrie axiale et dans un mode de mise en oeuvre préféré, le fond 18 associé au contact mobile présente une forme analogue à celle du fond 19 associé au contact fixe, la gorge correspondante étant dans ce cas inutilisée. Dans l'exemple représenté sur la figure 2, les fonds 18,19 sont métalliques, et l'isolation est assurée par l'enveloppe cylindrique 17. Il est clair que les fonds 18 et ou 19 peuvent être isolants et contribuer ou assurer la tenue diélectrique de la cartouche 13 dans l'hexafluorure de soufre.Referring more particularly to FIG. 2, it can be seen that the vacuum cartridge 13 comprises a cylindrical envelope 17 made of glass or ceramic material closed by two bottoms 18,19. Inside the cartridge 13 are arranged on the bottom side 19, the fixed contact 15, and on the bottom side 18, the movable contact 16 carried by the control rod 20 which crosses the bottom 18 in a sealed manner. The arcing contacts 15 and 16 are disc-shaped in a material of high resistivity. The bottom 19 has an annular groove 21 extending to the base of the separation gap of the arcing contacts 15, 16 in the open position. This groove 21 open upwards in FIG. 2 allows the insertion of an annular coil 22 which is housed in the bottom of the groove 21, so as to coaxially surround the separation interval of the contacts 15, 16. The arcing contacts 15,16 are arranged in the center of the coil 22, and it is easy to see that the magnetic field generated by the current flowing through this coil 22 is axial over the entire extent of the arcing contacts 15.16. The coil 22 is inserted with little play in the groove 21 which holds it mechanically. The bottom 19 is bell-shaped covering the fixed arcing contact 15 and internally sheathing the coil 22, the lower edge 23 of this bell being curved to form a cylindrical wall 24 of external sheathing of the coil 22. This external wall 24 can extend to the level of the bottom 19, as shown in Figure 2 and connect at this location to the insulating cylindrical shell 17. The height of this outer wall 24 can also be reduced if the dielectric strength is sufficient . The assembly has an axial symmetry and in a preferred embodiment, the bottom 18 associated with the movable contact has a shape similar to that of the bottom 19 associated with the fixed contact, the corresponding groove being in this case unused. In the example shown in FIG. 2, the bottoms 18.19 are metallic, and the insulation is ensured by the cylindrical envelope 17. It is clear that the bottoms 18 and or 19 can be insulating and contribute or ensure the holding dielectric of the cartridge 13 in sulfur hexafluoride.

La bobine 22 est une spire unique de section rectangulaire ayant deux extrémités 25,26, sensiblement parallèles au fond 19 de manière à sortir de la gorge 21 et à s'étendre radialement en direction de l'axe de la cartouche à vide 13. L'extrémité 25 est plaquée sur le contact d'arc fixe 15 et présente un trou 27 de passage d'une vis de fixation 28. L'autre extrémité 26 agencée en conducteur d'amenée de courant est superposée à l'extrémité 25, en étant isolée de cette dernière par des rondelles isolantes 29. La vis 28 traverse un orifice agrandi 30 pour assujettir par vissage dans un orifice fileté du contact d'arc fixe 15, les deux extrémités 25,26 au contact d'arc fixe 15. Les extrémités 25,26 contribuent ainsi au maintien de la spire 22 dans la gorge 21 d'une manière particulièrement simple. On voit que le courant amené par l'extrémité 26 parcourt la spire 22 avant d'atteindre le contact d'arc fixe 15, et engendre ainsi le champ magnétique axial dans la zone de séparation des contacts d'arc 15,16.The coil 22 is a single turn of rectangular section having two ends 25, 26, substantially parallel to the bottom 19 so as to leave the groove 21 and extend radially in the direction of the axis of the vacuum cartridge 13. L end 25 is pressed against the fixed arcing contact 15 and has a hole 27 for the passage of a fixing screw 28. The other end 26 arranged as a current supply conductor is superimposed on end 25, in being insulated from the latter by insulating washers 29. The screw 28 passes through an enlarged orifice 30 to secure, by screwing in a threaded orifice of the fixed arcing contact 15, the two ends 25, 26 to the fixed arcing contact 15. The ends 25, 26 thus contribute to maintaining the turn 22 in the groove 21 in a particularly simple manner. It can be seen that the current supplied by the end 26 flows through the turn 22 before reaching the fixed arcing contact 15, and thus generates the axial magnetic field in the separation zone of the arcing contacts 15,16.

La figure 4 illustre une variante de réalisation dans laquelle la bobine 22 est disposée au niveau du fond 19 avec un léger décalage vers le haut, par rapport à l'intervalle de séparation des contacts d'arc 15,16. Le spectre du champ magnétique engendré par la bobine 22 n'est plus absolument idéal puisqu'il présente une légère composante radiale, mais la réduction de la profondeur de la gorge 21 facilite la réalisation du fond 19. Les avantages de frettage mécanique de la bobine 22 sont par contre intégralement conservés.FIG. 4 illustrates an alternative embodiment in which the coil 22 is arranged at the bottom 19 with a slight upward offset, with respect to the separation interval of the arcing contacts 15, 16. The spectrum of the magnetic field generated by the coil 22 is no longer absolutely ideal since it has a slight radial component, but the reduction in the depth of the groove 21 facilitates the production of the bottom 19. The advantages of mechanical shrinking of the coil 22 are on the other hand entirely preserved.

La structure de la cartouche à vide 13 est extrêmement simple.The structure of the vacuum cartridge 13 is extremely simple.

L'invention n'est bien entendu nullement limitée au mode de mise en oeuvre plus particulièrement décrit, et elle s'étend au contraire à toutes variantes restant dans le cadre des équivalences, notamment à celle dans laquelle la bobine comporterait plusieurs spires, ou celle encore ou la bobine serait incorporée dans une gorge obturée, soit lors de la fabrication, soit par un enrobage ultérieur.The invention is of course in no way limited to the mode of implementation more particularly described, and it extends to contrary to all variants remaining within the framework of equivalences, in particular to that in which the coil would comprise several turns, or that still where the coil would be incorporated in a closed groove, either during manufacture, or by subsequent coating.

Claims (7)

Disjoncteur électrique moyenne tension comprenant une enceinte étanche (10) remplie d'un gaz à rigidité diélectrique élevée tel que l'hexafluorure de soufre, une paire de contacts principaux (11,12) disposés dans ladite enceinte (10), une cartouche à vide (13) à enveloppe cylindrique (17) obturée par deux fonds, disposée dans ladite enceinte (10) et contenant une paire de contacts d'arc (15,16) alignés, connectés électriquement en parallèle desdits contacts principaux (11,12), un mécanisme de commande (14) desdits contacts (11,12,15,16) pour ouvrir les contacts d'arc (15,16) après les contacts principaux (11,12) et les fermer avant les contacts principaux (11,12), et une bobine (22) produisant un champ magnétique axial dans la zone de formation d'un arc, tiré à l'intérieur de la cartouche (13) lors de la séparation des contacts d'arc (15,16), caractérisé en ce que ladite bobine (22) en forme d'anneau est disposée coaxialement à l'extérieur de la cartouche à vide (13) dans ladite enceinte (10) au droit de l'intervalle de séparation des contacts d'arc (15,16) en position ouvert, que le diamètre de la bobine (22) est inférieur au diamètre de ladite enveloppe (17) et que le fond (19) adjacent à la bobine (22) est conformé et associé à la bobine pour gainer intérieurement cette dernière.Medium voltage electrical circuit breaker comprising a sealed enclosure (10) filled with a gas with high dielectric strength such as sulfur hexafluoride, a pair of main contacts (11,12) disposed in said enclosure (10), a vacuum cartridge (13) with a cylindrical envelope (17) closed by two bottoms, disposed in said enclosure (10) and containing a pair of aligned arcing contacts (15,16), electrically connected in parallel with said main contacts (11,12), a control mechanism (14) of said contacts (11,12,15,16) for opening the arcing contacts (15,16) after the main contacts (11,12) and closing them before the main contacts (11,12 ), and a coil (22) producing an axial magnetic field in the arc-forming area, drawn inside the cartridge (13) during the separation of the arcing contacts (15,16), characterized in that said ring-shaped coil (22) is arranged coaxially outside the cartridge to vacuum (13) in said enclosure (10) in line with the separation gap of the arcing contacts (15,16) in the open position, that the diameter of the coil (22) is less than the diameter of said envelope (17 ) and that the bottom (19) adjacent to the coil (22) is shaped and associated with the coil to sheath internally the latter. Disjoncteur électrique selon la revendication 1, caractérisé en ce que la bobine (22) et le fond associé (19) sont disposés du côté du contact d'arc fixe (15).Electric circuit breaker according to claim 1, characterized in that the coil (22) and the associated bottom (19) are arranged on the side of the fixed arcing contact (15). Disjoncteur électrique selon la revendication 1 ou 2, caractérisé en ce que ledit fond associé (19) à la bobine (22) confine un logement (21) annulaire à extrémité ouverte du côté dudit fond, et de section appropriée à l'insertion de la bobine (22) dans ce logement, et que la paroi interne dudit logement entoure coaxialement ledit contact d'arc fixe (15) en ménageant un espace suffisant à l'isolation électrique.Electric circuit breaker according to claim 1 or 2, characterized in that said bottom associated (19) with the coil (22) confines an annular housing (21) with open end on the side of said bottom, and of section suitable for the insertion of the coil (22) in this housing, and that the internal wall of said housing coaxially surrounds said fixed arcing contact (15) while leaving sufficient space for electrical insulation. Disjoncteur électrique selon la revendication 3, caractérisé en ce que la paroi externe (24) dudit logement (21) se raccorde à l'enveloppe cylindrique (17) de la cartouche (13) en un matériau isolant et d'une longueur appropriée à la tenue diélectrique dans l'hexafluorure de soufre.Electric circuit breaker according to claim 3, characterized in that the external wall (24) of said housing (21) is connected to the cylindrical casing (17) of the cartridge (13) in an insulating material and of a length suitable for the dielectric strength in sulfur hexafluoride. Disjoncteur électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que la bobine (22) est à spire unique et comporte une première et une deuxième extrémités (25,26) s'étendant chacune avec un décalage angulaire, parallèlement audit fond (19) associé à la bobine (22), la première extrémité (25) étant solidarisée mécaniquement et électriquement au contact d'arc fixe (15).Electric circuit breaker according to any one of the preceding claims, characterized in that the coil (22) has a single turn and has first and second ends (25,26) each extending with an angular offset, parallel to said bottom ( 19) associated with the coil (22), the first end (25) being mechanically and electrically connected to the fixed arc contact (15). Disjoncteur électrique selon la revendication 5, caractérisé en ce que la deuxième extrémité (26) est raccordée à l'un des contacts principaux (11,12) tout en étant mécaniquement fixée au contact d'arc fixe (15), dont elle est électriquement isolée.Electric circuit breaker according to claim 5, characterized in that the second end (26) is connected to one of the main contacts (11,12) while being mechanically fixed to the fixed arcing contact (15), of which it is electrically isolated. Disjoncteur électrique selon la revendication 5 ou 6, caractérisé en ce que au droit du contact d'arc fixe (15) les deux extrémités (25,26) de la bobine (22) sont superposées et présentent des trous alignés pour le passage d'une vis (28), se vissant dans le contact d'arc fixe (15), la première extrémité (25) étant au contact du contact d'arc tandis que la deuxième (26) est isolée électriquement par des rondelles isolantes (29) de la première extrémité et de la vis.Electric circuit breaker according to claim 5 or 6, characterized in that, in line with the fixed arcing contact (15), the two ends (25, 26) of the coil (22) are superimposed and have aligned holes for the passage of a screw (28), screwing into the fixed arcing contact (15), the first end (25) being in contact with the arcing contact while the second (26) is electrically insulated by insulating washers (29) of the first end and of the screw.
EP92420362A 1991-10-17 1992-10-14 Hybrid circuit-breaker with axial blow-out coil Expired - Lifetime EP0538157B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9113063 1991-10-17
FR9113063A FR2682808B1 (en) 1991-10-17 1991-10-17 HYBRID CIRCUIT BREAKER WITH AXIAL BLOWING COIL.

Publications (2)

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EP0538157A1 true EP0538157A1 (en) 1993-04-21
EP0538157B1 EP0538157B1 (en) 1996-04-17

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ID=9418216

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EP92420362A Expired - Lifetime EP0538157B1 (en) 1991-10-17 1992-10-14 Hybrid circuit-breaker with axial blow-out coil

Country Status (10)

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US (1) US5280144A (en)
EP (1) EP0538157B1 (en)
JP (1) JPH05250965A (en)
KR (1) KR100267896B1 (en)
CN (1) CN1043547C (en)
AT (1) ATE137056T1 (en)
CA (1) CA2080518A1 (en)
DE (1) DE69209966T2 (en)
ES (1) ES2087494T3 (en)
FR (1) FR2682808B1 (en)

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FR2726396A1 (en) * 1994-10-31 1996-05-03 Schneider Electric Sa VACUUM ELECTRIC SWITCH
US5861597A (en) * 1994-10-31 1999-01-19 Schneider Electric S.A. Vacuum electrical switch
FR2745118A1 (en) * 1996-02-16 1997-08-22 Schneider Electric Sa Vacuum switch or circuit breaker for low or medium voltages
DE19809828C1 (en) * 1998-02-27 1999-07-08 Eckehard Dr Ing Gebauer Vacuum power circuit breaker

Also Published As

Publication number Publication date
EP0538157B1 (en) 1996-04-17
CA2080518A1 (en) 1993-04-18
FR2682808A1 (en) 1993-04-23
KR930008893A (en) 1993-05-22
ATE137056T1 (en) 1996-05-15
DE69209966T2 (en) 1996-09-26
DE69209966D1 (en) 1996-05-23
CN1043547C (en) 1999-06-02
KR100267896B1 (en) 2000-10-16
US5280144A (en) 1994-01-18
JPH05250965A (en) 1993-09-28
ES2087494T3 (en) 1996-07-16
CN1071782A (en) 1993-05-05
FR2682808B1 (en) 1997-01-24

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