EP0627751A1 - Circuit breaker with double arc lengthening for switching currents with a high DC component - Google Patents

Circuit breaker with double arc lengthening for switching currents with a high DC component Download PDF

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Publication number
EP0627751A1
EP0627751A1 EP94401207A EP94401207A EP0627751A1 EP 0627751 A1 EP0627751 A1 EP 0627751A1 EP 94401207 A EP94401207 A EP 94401207A EP 94401207 A EP94401207 A EP 94401207A EP 0627751 A1 EP0627751 A1 EP 0627751A1
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EP
European Patent Office
Prior art keywords
contact
arc
current
tube
fixed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94401207A
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German (de)
French (fr)
Inventor
Van Doan Pham
Joseph Martin
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Grid Solutions SAS
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GEC Alsthom T&D SA
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Publication of EP0627751A1 publication Critical patent/EP0627751A1/en
Withdrawn legal-status Critical Current

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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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/18—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • 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
    • H01H33/006—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means adapted for interrupting fault currents with delayed zero crossings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas

Definitions

  • the present invention relates to the breaking of currents with a large DC component, which is encountered, for example, in high-voltage alternating networks with series compensation, when certain types of faults appear.
  • the presence of the DC component can cause the current to pass through zero for several periods. It is therefore difficult to cut off the power using conventional sulfur hexafluoride (SF6) circuit breakers.
  • SF6 sulfur hexafluoride
  • An object of the present invention is to provide a circuit breaker capable of creating a high arc voltage, using the SF6 circuit breakers existing on the market, with a minor modification and at low cost;
  • the basic idea is to configure the arcing contacts so that the current crosses them, in at least part of their length, in the opposite direction to the arcing current. In this way, on each of these contacts, a current loop is created, which, under Lenz's law, tends to enlarge, so that the roots of the arc are pushed away from the ends of the contacts. arc.
  • the arc is thus doubly elongated which, as explained above, promotes the disappearance of the DC component of the current.
  • the invention thus relates to a circuit breaker as described in the claims.
  • the oscillogram of FIG. 1 shows the fault current with the delayed current passing through zero.
  • the arc To advance the zero crossing of the current, the arc must therefore be extended to the maximum possible as soon as the arcing contacts are separated.
  • Figure 2 is a schematic view in axial section of a breaking chamber of a pole of a conventional circuit breaker, shown in the tripped position. It comprises an envelope 1, made of insulating material such as ceramic, closed by two metal flanges 2 and 3 carrying sockets 2A and 3A. The volume 4 thus delimited is filled with a gas with good dielectric properties such as sulfur hexafluoride SF6 or nitrogen, under a pressure of a few hectopascals.
  • a gas with good dielectric properties such as sulfur hexafluoride SF6 or nitrogen, under a pressure of a few hectopascals.
  • a fixed assembly Inside the envelope are arranged a fixed assembly and a movable assembly.
  • the fixed assembly comprises metal arms 5 mechanically and electrically connected to the flange 2 and supporting a contact 6 for the passage of the permanent current and an arcing contact 7.
  • Contact 6 is a tube; the contact 7 is also tubular and will be described in detail with reference to FIG. 3.
  • the mobile assembly comprises a cylinder 9, one end of which carries a metal crown 10; the cylinder is connected to an insulating rod 11 which passes tightly through the flange 3 and which is connected to a control not shown.
  • the ring 10 carries contact fingers 12 for the passage of the permanent current and which cooperate, when the circuit breaker is closed, with the tube 6.
  • the fingers 12 are protected by a corona hood 12A fixed to the cylinder 9.
  • the crown 10 carries a blowing nozzle 17 preferably made of insulating material.
  • the piston 18, the crown 10 and the cylinder 9 define a blowing volume V.
  • the crown 10 carries holes 10A to allow the gas of volume V, compressed during an opening operation of the circuit breaker, to escape through the nozzle to blow the arc.
  • Figure 3 shows the specific constitution of the arcing contacts, allowing the arc to be extended twice.
  • the fixed arcing contact generally designated by the reference 7, comprises two coaxial tubular metal portions 50 and 51, separated by an insulating layer 52, for example made of Teflon.
  • the portions 50 and 51 are joined at their end by a metal tip 49 made of an alloy resistant to the effects of the electric arc, for example based on tunstene (wolfram).
  • the tubular portion 51 is intended to cooperate with the fingers 14 of the movable assembly. It is terminated at the end opposite to the end piece by an annular bead 54.
  • the tubular portion 50 is coated internally, over a certain length, from the end piece 49, by an insulating layer 53, for example made of teflon.
  • the tube carrying the fingers of the movable arcing contact consists of two coaxial metal portions 57 and 60, isolated from each other by an insulating layer 59, and joined to a end by a tip 56 made of metal alloy resistant to the effects of electric arc.
  • the layer 57 is terminated, at its end opposite the end piece 56, by an annular bead 58.
  • the main fingers 12 are supported on the metal tube 6
  • the arcing fingers 14 are supported on the metal tube 51.
  • the arc moves from the fingers 14 to the nozzle 56, especially if the current is in the downward phase A of current reduction (see Fig. 1).
  • the current in the arc is of opposite direction to the current in the zone 57A of the tube 57.
  • the loop effect (law of the maximum induction flux or Lenz's law) tends to move the root of the arc 62A along the interior surface of the tube 57 to the bead 58.
  • the blowing of the gas pushes the root of the arc 62B of the nozzle 49 towards the external end region 51A of the tube 51.
  • the current in 51A is of direction opposite that of arc 62B; the loop effect pushes the root of the arc along the outer surface of the tube 51 to the bead 54, especially if the current is in the downward phase A or in the downward phase B.
  • This current has an intensity of several millirs of amperes.
  • the insulating layer 53 prevents the arc from catching on the interior surface of the tube 50.
  • an insulating layer 55 is placed on the interior surface of this tube.
  • the double elongation of the arc, on the fixed side and on the movable side, makes it possible to obtain a large arc voltage which, by its intrinsic resistance, makes it easier for the DC component to decrease, to force a zero crossing, either by t1, or in t2, depending on the value of the current and the duration of the arc.
  • the invention makes it possible, by means of an inexpensive adaptation of existing circuit breakers, to obtain a device perfectly suited to breaking currents with a large DC component.

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  • Circuit Breakers (AREA)

Abstract

Circuit breaker with insulation and blowing by gas with good dielectric properties, comprising, for each pole, at least one sealed insulating casing filled with the said gas under pressure, and containing a fixed assembly comprising a contact for the permanent current to pass and an arc contact, and a movable assembly actuated by an insulating rod linkage passing in a sealed way through a wall of the said casing, the said moving assembly further comprising a contact for the permanent current to pass, an arc contact, a blowing cylinder including a blowing piston, and a blowing nozzle, characterised in that the fixed (50, 51) and movable (14, 57, 60) arc contacts are produced in such a way that at least a portion of the latter are traversed by the current in the opposite direction of the arc current. <IMAGE>

Description

La présente invention concerne la coupure des courants à grande composante continue, que l'on rencontre par exemple dans les réseaux alternatifs à haute tension à compensation série, lors de l'apparition de certains types de défauts. La présence de la composante continue peut entraîner le non passage par zéro du courant, pendant plusieurs périodes. Il est alors difficile de couper le courant par des disjoncteurs à hexafluorure de soufre (SF6) classiques.The present invention relates to the breaking of currents with a large DC component, which is encountered, for example, in high-voltage alternating networks with series compensation, when certain types of faults appear. The presence of the DC component can cause the current to pass through zero for several periods. It is therefore difficult to cut off the power using conventional sulfur hexafluoride (SF6) circuit breakers.

Il est bien connu que pour remédier à cet inconvénient, il faut, par un moyen convenable, augmenter la tension d'arc; une tension d'arc élevée permet en effet d'absorber l'énergie de la composante continue du courant et de la faire tendre vers zéro.It is well known that to remedy this drawback, it is necessary, by suitable means, to increase the arc voltage; a high arc voltage indeed makes it possible to absorb the energy of the direct component of the current and to make it tend towards zero.

Il a été proposé d'utiliser une chambre de coupure à fusibles permanents en série avec un disjoncteur haute tension classique. La fusion des fusibles, lors d'une opération de déclenchement sur défaut, produit une très forte tension d'arc qui fait décroître très rapidement la composante continue du courant de défaut.It has been proposed to use a permanent fuse breaking chamber in series with a conventional high voltage circuit breaker. The melting of the fuses, during a fault tripping operation, produces a very high arc voltage which very rapidly decreases the DC component of the fault current.

Il a été proposé d'utiliser une chambre de coupure à haute pression munie de moyens pour créer plusieurs arcs en série, et on pourra se référer au document FR-A-9111756.It has been proposed to use a high pressure interrupting chamber provided with means for creating several arcs in series, and reference may be made to document FR-A-9111756.

Ces solutions nécessitent l'emploi d'appareils nouveaux. Un but de la présente invention est de réaliser un disjoncteur capable de créer une forte tension d'arc, en utilisant les disjoncteurs à SF6 existant sur le marché, moyennant une modification mineure et de faible coût;These solutions require the use of new devices. An object of the present invention is to provide a circuit breaker capable of creating a high arc voltage, using the SF6 circuit breakers existing on the market, with a minor modification and at low cost;

L'idée de base est de configurer les contacts d'arc de manière qu'ils soient traversés par le courant, dans au moins une partie de leur longueur, en sens inverse du courant d'arc. De la sorte, sur chacun de ces contacts, une boucle de courant est créée, qui, en vertu de la loi de Lenz, a tendance à s'agrandir, de sorte que les racines de l'arc sont repoussées loin des extrémités des contacts d'arc. L'arc est ainsi doublement allongé ce qui, comme on l'a expliqué plus haut, favorise la disparition de la composante continue du courant.The basic idea is to configure the arcing contacts so that the current crosses them, in at least part of their length, in the opposite direction to the arcing current. In this way, on each of these contacts, a current loop is created, which, under Lenz's law, tends to enlarge, so that the roots of the arc are pushed away from the ends of the contacts. arc. The arc is thus doubly elongated which, as explained above, promotes the disappearance of the DC component of the current.

L'invention a ainsi pour objet un disjoncteur tel que décrit dans les revendications.The invention thus relates to a circuit breaker as described in the claims.

L'invention est maintenant expliquée en détail par la description d'un exemple de réalisation, en référence au dessin annexé dans lequel:

  • la figure 1 est un diagramme montrant les variations d'un courant alternatif à grande composante continue,
  • la figure 2 est une vue schématique en coupe axiale d'une chambre de coupure d'un pôle de disjoncteur,
  • la figure 3 est une vue agrandie des parties modifiées de la figure 2.
The invention is now explained in detail by the description of an exemplary embodiment, with reference to the appended drawing in which:
  • FIG. 1 is a diagram showing the variations of an alternating current with a large direct component,
  • FIG. 2 is a schematic view in axial section of a breaking chamber of a circuit breaker pole,
  • FIG. 3 is an enlarged view of the modified parts of FIG. 2.

L'oscillogramme de la Fig. 1 montre le courant de défaut avec le passage par zéro du courant retardé.The oscillogram of FIG. 1 shows the fault current with the delayed current passing through zero.

Pour avancer le passage par zéro du courant, il faut donc allonger l'arc au maximum possible dès la séparation des contacts d'arc.To advance the zero crossing of the current, the arc must therefore be extended to the maximum possible as soon as the arcing contacts are separated.

Par exemple, si la séparation des contacts a lieu à l'instant t0, on veut forcer le passage à zéro du courant à l'instant t1 (une pseudo période après t0) , ou au plus tard à l'instant t2 (deux pseudo-périodes après t0).For example, if the separation of the contacts takes place at time t0, we want to force the zero crossing of the current at time t1 (a pseudo period after t0), or at the latest at time t2 (two pseudo -periods after t0).

La figure 2 est une vue schématique en coupe axiale d'une chambre de coupure d'un pôle d'un disjoncteur classique, représentée en position déclenchée. Elle comprend une enveloppe 1, en matériau isolant tel que la céramique, fermée par deux flasque métalliques 2 et 3 portant des prises de courant 2A et 3A. Le volume 4 ainsi délimité est rempli d'un gaz à bonnes propriétés diélectriques tel que l'hexafluorure de soufre SF6 ou l'azote, sous une pression de quelques hectopascals.Figure 2 is a schematic view in axial section of a breaking chamber of a pole of a conventional circuit breaker, shown in the tripped position. It comprises an envelope 1, made of insulating material such as ceramic, closed by two metal flanges 2 and 3 carrying sockets 2A and 3A. The volume 4 thus delimited is filled with a gas with good dielectric properties such as sulfur hexafluoride SF6 or nitrogen, under a pressure of a few hectopascals.

A l'intérieur de l'enveloppe sont disposés un ensemble fixe et un ensemble mobile.Inside the envelope are arranged a fixed assembly and a movable assembly.

L'ensemble fixe comprend des bras métalliques 5 reliés mécaniquement et électriquement au flasque 2 et supportant un contact 6 pour le passage du courant permanent et un contact d'arc 7.The fixed assembly comprises metal arms 5 mechanically and electrically connected to the flange 2 and supporting a contact 6 for the passage of the permanent current and an arcing contact 7.

Le contact 6 est un tube; le contact 7 est également tubulaire et sera décrit en détail en référence à la figure 3.Contact 6 is a tube; the contact 7 is also tubular and will be described in detail with reference to FIG. 3.

L'ensemble mobile comprend un cylindre 9 dont une extrémité porte une couronne métallique 10; le cylindre est relié à une tringle isolante 11 qui traverse de manière étanche le flasque 3 et qui est reliée à une commande non représentée.The mobile assembly comprises a cylinder 9, one end of which carries a metal crown 10; the cylinder is connected to an insulating rod 11 which passes tightly through the flange 3 and which is connected to a control not shown.

La couronne 10 porte des doigts de contact 12 pour le passage du courant permanent et qui coopèrent, lorsque le disjoncteur est fermé, avec le tube 6. Les doigts 12 sont protégés par un capot pare-effluves 12A fixé au cylindre 9.The ring 10 carries contact fingers 12 for the passage of the permanent current and which cooperate, when the circuit breaker is closed, with the tube 6. The fingers 12 are protected by a corona hood 12A fixed to the cylinder 9.

A la couronne 10 est également fixé un tube 13 portant des doigts de contact d'arc 14 et coopérant avec le contact d'arc fixe tubulaire 7.To the crown 10 is also fixed a tube 13 carrying arcing contact fingers 14 and cooperating with the fixed tubular arcing contact 7.

La couronne 10 porte une buse de soufflage 17 de préférence en matériau isolant.The crown 10 carries a blowing nozzle 17 preferably made of insulating material.

A l'intérieur du cylindre 9 est disposé un piston annulaire fixe 18, fixé par des bras 19 au flasque 3. Le piston 18, la couronne 10 et le cylindre 9 définissent un volume de soufflage V.Inside the cylinder 9 is disposed a fixed annular piston 18, fixed by arms 19 to the flange 3. The piston 18, the crown 10 and the cylinder 9 define a blowing volume V.

La couronne 10 porte des trous 10A pour permettre au gaz du volume V, comprimé lors d'une manoeuvre d'ouverture du disjoncteur, de s'échapper à travers la buse pour venir souffler l'arc.The crown 10 carries holes 10A to allow the gas of volume V, compressed during an opening operation of the circuit breaker, to escape through the nozzle to blow the arc.

La liaison galvanique entre le cylindre 9 et le flasque 3 est assurée par des doigts de contact tel que le contact 20.The galvanic connection between the cylinder 9 and the flange 3 is ensured by contact fingers such as contact 20.

La figure 3 montre la constitution spécifique des contacts d'arc, permettant le double allongement de l'arc.Figure 3 shows the specific constitution of the arcing contacts, allowing the arc to be extended twice.

Le contact d'arc fixe, désigné globalement par la référence 7, comprend deux portions métalliques tubulaires coaxiales 50 et 51, séparées par une couche isolante 52, par exemple en téflon. Les portions 50 et 51 sont réunies à leur extrémité par un embout métallique 49 réalisé en un alliage résistant aux effets de l'arc électrique, par exemple à base de tunstène (wolfram). La portion tubulaire 51 est destiné à coopérer avec les doigts 14 de l'ensemble mobile. Elle est terminée à l'extrémité opposée à l'embout par un bourrelet annulaire 54. La portion tubulaire 50 est revêtue intérieurement, sur une certaine longueur, à partir de l'embout 49, par une couche isolante 53, par exemple en téflon.The fixed arcing contact, generally designated by the reference 7, comprises two coaxial tubular metal portions 50 and 51, separated by an insulating layer 52, for example made of Teflon. The portions 50 and 51 are joined at their end by a metal tip 49 made of an alloy resistant to the effects of the electric arc, for example based on tunstene (wolfram). The tubular portion 51 is intended to cooperate with the fingers 14 of the movable assembly. It is terminated at the end opposite to the end piece by an annular bead 54. The tubular portion 50 is coated internally, over a certain length, from the end piece 49, by an insulating layer 53, for example made of teflon.

Le tube portant les doigts du contact d'arc mobile, désigné globalement par 13 dans la figure 2, est constitué de deux portions métalliques coaxiales 57 et 60, isolées l'une de l'autre par une couche isolante 59, et réunies à une extrémité par un embout 56 en alliage métallique résistant aux effets de l'arc électrique. La couche 57 est terminée, à son extrémité opposée à l'embout 56, par un bourrelet annulaire 58.The tube carrying the fingers of the movable arcing contact, generally designated by 13 in FIG. 2, consists of two coaxial metal portions 57 and 60, isolated from each other by an insulating layer 59, and joined to a end by a tip 56 made of metal alloy resistant to the effects of electric arc. The layer 57 is terminated, at its end opposite the end piece 56, by an annular bead 58.

Le fonctionnement est le suivant, en notant que les éléments en traits tiretés correspondent à la position enclenchée du disjoncteur.The operation is as follows, noting that the elements in dashed lines correspond to the on position of the circuit breaker.

En position enclenchée, les doigts principaux 12 s'appuient sur le tube métallique 6, les doigts d'arc 14 s'appuient sur le tube métallique 51.In the engaged position, the main fingers 12 are supported on the metal tube 6, the arcing fingers 14 are supported on the metal tube 51.

A la séparation des contacts principaux 6 et 12, tout le courant se reporte dans les doigts 14 qui se rapprochent de l'embout 49.When the main contacts 6 and 12 separate, all the current is transferred to the fingers 14 which approach the end piece 49.

Le courant travers alors le tube 50, l'embout 49 et l'extrémité du tube 51. Lorsque les doigts 14 quittent l'embout 49, un arc 62 s'établit entre ces pièces.The current then passes through the tube 50, the end piece 49 and the end of the tube 51. When the fingers 14 leave the end piece 49, an arc 62 is established between these parts.

Grâce au soufflage du gaz comprimé issu du volume de soufflage V, l'arc se déplace des doigts 14 à l'embout 56, surtout si le courant se trouve dans la phase A descendante de diminution du courant (voir Fig. 1). Quand la racine de l'arc atteint le tube 57 ( arc 62A et zone 57A dans la figure 3), le courant dans l'arc est de sens opposé au courant dans la zone 57A du tube 57. L'effet de boucle (loi du maximum du flux d'induction ou loi de Lenz) tend à déplacer la racine de l'arc 62A le long de la surface intérieure du tube 57 jusqu'au bourrelet 58.Thanks to the blowing of the compressed gas coming from the blowing volume V, the arc moves from the fingers 14 to the nozzle 56, especially if the current is in the downward phase A of current reduction (see Fig. 1). When the root of the arc reaches the tube 57 (arc 62A and zone 57A in FIG. 3), the current in the arc is of opposite direction to the current in the zone 57A of the tube 57. The loop effect (law of the maximum induction flux or Lenz's law) tends to move the root of the arc 62A along the interior surface of the tube 57 to the bead 58.

Lorsque l'embout 49 quitte le col 17A de la buse 17, le soufflage du gaz pousse la racine de l'arc 62B de l'embout 49 vers la zone externe d'extrémité 51A du tube 51. Le courant dans 51A est de sens opposé à celui de l'arc 62B; l'effet de boucle pousse la racine de l'arc le long de la surface extérieure du tube 51 jusqu'au bourrelet 54, surtout si le courant est dans la phase descendante A ou dans la phase descendante B. Ce courant a une intensité de plusieurs millirs d'ampères.When the nozzle 49 leaves the neck 17A of the nozzle 17, the blowing of the gas pushes the root of the arc 62B of the nozzle 49 towards the external end region 51A of the tube 51. The current in 51A is of direction opposite that of arc 62B; the loop effect pushes the root of the arc along the outer surface of the tube 51 to the bead 54, especially if the current is in the downward phase A or in the downward phase B. This current has an intensity of several millirs of amperes.

La couche isolante 53 empêche l'arc de s'accrocher sur la surface intérieure du tube 50.The insulating layer 53 prevents the arc from catching on the interior surface of the tube 50.

Pour éviter qu'il s'accroche sur le tube 6, une couche isolante 55 est placée sur la surface intérieure de ce tube.To prevent it from catching on the tube 6, an insulating layer 55 is placed on the interior surface of this tube.

Le double allongement de l'arc, du côté fixe et du côté mobile, permet d'obtenir une tension d'arc importante qui facilite par sa résistance intrinsèque la décroissance de la composante continue du courant, pour forcer un passage par zéro, soit en t1, soit en t2, selon la valeur du courant et la durée de l'arc.The double elongation of the arc, on the fixed side and on the movable side, makes it possible to obtain a large arc voltage which, by its intrinsic resistance, makes it easier for the DC component to decrease, to force a zero crossing, either by t1, or in t2, depending on the value of the current and the duration of the arc.

Pour les courants ascendants ( zones désignées C et D dans la Fig. 1), d'intensité égale à quelques dizaines de kiloampères, l'arc aura une longueur plus faible.For updrafts (zones designated C and D in Fig. 1), of intensity equal to a few tens of kiloamperes, the arc will have a shorter length.

L'invention permet, moyennant une adaptation peu coûteuse des disjoncteurs existants, d'obtenir un appareil parfaitement adapté à la coupure des courants à grande composante continue.The invention makes it possible, by means of an inexpensive adaptation of existing circuit breakers, to obtain a device perfectly suited to breaking currents with a large DC component.

Claims (3)

1/ Disjoncteur à isolation et soufflage par gaz à bonnes propriétés diélectriques comprenant pour chaque pôle au moins une enveloppe isolante étanche remplie dudit gaz sous pression, et contenant un ensemble fixe comprenant un contact pour le passage du courant permanent et un contact d'arc, et un ensemble mobile actionné par une tringle isolante traversant de manière étanche une paroi de ladite enveloppe, ledit ensemble mobile comprenant en outre un contact pour le passage du courant permanent, un contact d'arc, un cylindre de soufflage comportant un piston de soufflage, et une buse de soufflage, caractérisé en ce que les contacts d'arc fixe (50, 51) et mobile (14,57,60) sont réalisés de manière qu'au moins une portion de ceux-ci soit traversée par le courant en sens inverse du courant d'arc. 1 / Circuit breaker with gas blowing and insulation with good dielectric properties comprising for each pole at least one sealed insulating envelope filled with said gas under pressure, and containing a fixed assembly comprising a contact for the passage of permanent current and an arcing contact, and a movable assembly actuated by an insulating rod sealingly passing through a wall of said envelope, said movable assembly further comprising a contact for the passage of permanent current, an arcing contact, a blowing cylinder comprising a blowing piston, and a blowing nozzle, characterized in that the fixed (50, 51) and movable (14,57,60) arcing contacts are made so that at least a portion of them is crossed by the current in opposite direction of the arc current. 2/ Disjoncteur selon la revendication 1, caractérisé en ce que le contact d'arc fixe est constitué par un premier (50) et un second (51) tubes métalliques coaxiaux reliés électriquement à une extrémité par un embout (49) en alliage métallique résistant aux effets de l'arc, isolés l'un de l'autre par une couche isolante (52), le second tube (51) étant en contact avec le contact d'arc mobile (14), le premier tube étant partiellement recouvert par une couche isolante (53) contigue audit embout (49), ledit second tube comprenant un bourrelet annulaire (54), ledit arc se déplaçant sur ledit second tube (51) jusqu'audit bourrelet annulaire (54) . 2 / A circuit breaker according to claim 1, characterized in that the fixed arcing contact consists of a first (50) and a second (51) coaxial metal tubes electrically connected at one end by a ferrule (49) made of resistant metal alloy to the effects of the arc, isolated from each other by an insulating layer (52), the second tube (51) being in contact with the movable arcing contact (14), the first tube being partially covered by an insulating layer (53) contiguous to said tip (49), said second tube comprising an annular bead (54), said arc moving over said second tube (51) up to said annular bead (54). 3/ Disjoncteur selon l'une des revendications 1 et 2, caractérisé en ce que le contact d'arc mobile est réalisé par une couronne de doigts de contact (14) coopérant avec ledit second tube (51) du contact d'arc fixe, ladite couronne étant fixée à une pièce comprenant une première (60) et une seconde (57) parties tubulaires coaxiales réunies par une extrémité (56) en alliage métallique résistant aux effets de l'arc électrique et isolées l'une de l'autre par une couche isolante (59), ladite seconde partie tubulaire (57) comportant un bourrelet annulaire (58), ledit arc se déplaçant le long de ladite partie tubulaire (57) jusqu'audit bourrelet (58). 3 / Circuit breaker according to one of claims 1 and 2, characterized in that the movable arcing contact is produced by a ring of contact fingers (14) cooperating with said second tube (51) of the fixed arcing contact, said crown being fixed to a part comprising a first (60) and a second (57) coaxial tubular parts joined by one end (56) of metal alloy resistant to the effects of the electric arc and isolated from each other by an insulating layer (59), said second part tubular (57) having an annular bead (58), said arc moving along said tubular part (57) up to said bead (58).
EP94401207A 1993-06-03 1994-06-01 Circuit breaker with double arc lengthening for switching currents with a high DC component Withdrawn EP0627751A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9306661 1993-06-03
FR9306661A FR2706073B1 (en) 1993-06-03 1993-06-03 Circuit breaker with double arc extension for breaking currents with a large DC component.

Publications (1)

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EP0627751A1 true EP0627751A1 (en) 1994-12-07

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EP94401207A Withdrawn EP0627751A1 (en) 1993-06-03 1994-06-01 Circuit breaker with double arc lengthening for switching currents with a high DC component

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EP (1) EP0627751A1 (en)
FR (1) FR2706073B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7617505U1 (en) * 1976-05-28 1980-02-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen Contact arrangement for pressure gas switch
EP0039523A1 (en) * 1980-05-07 1981-11-11 BBC Aktiengesellschaft Brown, Boveri & Cie. High tension circuit breaker
DE9016830U1 (en) * 1990-12-10 1991-02-28 Siemens AG, 8000 München High-voltage circuit breakers
FR2681724A1 (en) * 1991-09-24 1993-03-26 Alsthom Gec High-voltage circuit breaker with high arc voltage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7617505U1 (en) * 1976-05-28 1980-02-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen Contact arrangement for pressure gas switch
EP0039523A1 (en) * 1980-05-07 1981-11-11 BBC Aktiengesellschaft Brown, Boveri & Cie. High tension circuit breaker
DE9016830U1 (en) * 1990-12-10 1991-02-28 Siemens AG, 8000 München High-voltage circuit breakers
FR2681724A1 (en) * 1991-09-24 1993-03-26 Alsthom Gec High-voltage circuit breaker with high arc voltage

Also Published As

Publication number Publication date
FR2706073B1 (en) 1995-07-07
FR2706073A1 (en) 1994-12-09

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