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EP0647955B1 - High voltage circuit breaker capable of interrupting fault currents with delayed zero-crossings - Google Patents

High voltage circuit breaker capable of interrupting fault currents with delayed zero-crossings Download PDF

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Publication number
EP0647955B1
EP0647955B1 EP94402269A EP94402269A EP0647955B1 EP 0647955 B1 EP0647955 B1 EP 0647955B1 EP 94402269 A EP94402269 A EP 94402269A EP 94402269 A EP94402269 A EP 94402269A EP 0647955 B1 EP0647955 B1 EP 0647955B1
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EP
European Patent Office
Prior art keywords
instant
circuit breaker
zmax
fault
breaker according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP94402269A
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German (de)
French (fr)
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EP0647955A1 (en
Inventor
Jocelyn Tremblay
René Doche
André Lefrancois
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Grid Solutions SAS
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GEC Alsthom T&D SA
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00Mechanisms for operating contacts
    • H01H3/32Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/52Driving mechanisms, i.e. for transmitting driving force to the contacts with means to ensure stopping at intermediate operative positions
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/006High-tension or heavy-current switches with arc-extinguishing or arc-preventing means adapted for interrupting fault currents with delayed zero crossings

Definitions

  • the moving part includes a metal tube 4 extended by a corona hood 5 and provided with a transverse metal partition 8 carrying fingers contact 6 constituting the movable main contact and a tube blowing 7 extended by contact fingers 8 constituting the movable arcing contact.
  • Partition 8 is drilled holes for the blowing gas passage and carries a blowing nozzle 9 made of insulating material.
  • the blowing is provided by a fixed piston 11 disposed inside the tube 4. This tube 4 is connected to a second socket.
  • the movement of the moving part is defined on the graphs shown in Figures 3 and 4.

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  • Circuit Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Keying Circuit Devices (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Breakers (AREA)

Abstract

The present invention relates to a high-voltage circuit breaker capable of cutting off alternating fault currents with pseudo-period T and with delayed zero crossing, passing through zero after a maximum length of time tzmax-t0 after the instant t0 at which the fault appears, this length of time tzmax-t0 being determined by simulations or by trials, comprising a plurality of cutoff chambers (1) in series equipped with means for being opened at an instant t1 subsequent to the instant of the fault t0 and with means of blowing of the arc designed to operate between the instant t1 and an instant tc prior to the instant tzmax-T. It includes means for reducing the blowing throughput which are adapted so that the blowing is prolonged up to an instant t2 lying between tzmax-T and tzmax+T. <IMAGE>

Description

La présente invention se rapporte à un disjoncteur à haute tension capable de couper des courants de défauts à passage par zéro retardé.The present invention relates to a circuit breaker with high voltage capable of breaking fault currents at delayed zero crossing.

Elle concerne plus précisément un disjoncteur à haute tension capable de couper des courants de défaut alternatifs de pseudo-période T et à passage par zéro retardé, passant par zéro après un laps de temps maximal tzmax-t0 après l'instant t0 d'apparition du défaut, ce laps de temps tzmax-t0 étant déterminé par simulations ou par essais, comprenant une pluralité de chambres de coupure en série équipées de moyens pour s'ouvrir à un instant t1 ultérieur à l'instant du défaut t0 et de moyens de soufflage de l'arc conçu pour fonctionner entre l'instant t1 et un instant tc antérieur à tzmax-T.It relates more precisely to a high circuit breaker voltage capable of breaking alternating fault currents of pseudo-period T and delayed zero crossing, passing by zero after a maximum time tzmax-t0 after the instant t0 of appearance of the fault, this time period tzmax-t0 being determined by simulations or tests, including a plurality of series interrupting chambers equipped with means for opening at an instant t1 subsequent to the instant defect t0 and arc blowing means designed to operate between time t1 and time tc prior to tzmax-T.

La coupure des courants à grande composante continue ou à passage par zéro retardé, que l'on rencontre par exemple dans les réseaux alternatifs à haute tension à compensation série, lors de l'apparition de certains types de défaut, pose de gros problèmes. La présence de la composante continue peut entraíner le non passage par zéro du courant pendant plusieurs pseudo-périodes. Il est alors impossible de couper le courant à l'aide de disjoncteurs classiques à hexafluorure de soufre.The breaking of currents with a large DC component or delayed zero crossing, which is encountered by example in high voltage alternative networks with series compensation, when certain types appear default, poses big problems. The presence of the DC component can cause non-zero crossing of current for several pseudo-periods. So he is impossible to cut the current using circuit breakers sulfur hexafluoride classics.

Il est bien connu pour remédier à ces problèmes d'augmenter la tension d'arc par des moyens convenables. Une tension d'arc élevée permet en effet d'absorber l'énergie de la composante continue du courant et de la faire tendre par zéro.It is well known to remedy these problems increase the arc voltage by suitable means. A high arc voltage in fact absorbs the energy of the continuous component of the current and to make it tend by zero.

Dans ce but il a été proposé d'utiliser une chambre de coupure munie de moyens pour créer plusieurs arcs en série dans le document de brevet français n°2 681 724.For this purpose it has been proposed to use a cut-out provided with means for creating several arcs in series in French patent document No. 2,681,724.

Il a également été proposé d'utiliser une chambre de coupure à fusibles permanents en série avec une chambre de coupure haute tension classique dans le document de brevet français n°2 678 770. La fusion des fusibles lors d'une opération de déclenchement sur défaut produit une très forte tension d'arc qui fait décroítre très rapidement la composante continue du courant de défaut.It has also been proposed to use a permanent fuse cut-out in series with a conventional high voltage cut-off in the patent document French n ° 2 678 770. The fusing of fuses during a fault trip operation produces a very strong arc voltage which very rapidly decreases the DC component of the fault current.

Il est connu également d'absorber l'énergie du réseau due à la composante continue en insérant temporairement une résistance sur le circuit. Une résistance convenable permet en effet de faire tendre vers zéro en un temps relativement court cette composante continue. Un tel agencement est décrit dans le document de brevet français n°2 683 937.It is also known to absorb energy from the network. due to the continuous component by temporarily inserting a resistance on the circuit. A suitable resistance allows indeed to tend towards zero in a relatively short time runs this continuous component. Such an arrangement is described in French patent document No. 2,683,937.

Il est aussi connu que la présence en parallèle sur une chambre de coupure d'un disjoncteur d'un condensateur de grande capacité en série avec une inductance produit à l'ouverture du disjoncteur des oscillations du courant qui augmentent la tension d'arc et engendrent une instabilité de l'arc favorisant la décroissance de la composante continue du courant et son passage par zéro. C'est le cas décrit dans le document de brevet français n°2 684 486, qui est considéré comme l'état de la technique le plus proche.It is also known that the presence in parallel on a breaking chamber of a circuit breaker of a capacitor large capacity in series with an inductance produced at the opening of the circuit breaker for the current oscillations which increase the arc voltage and cause instability of the arc favoring the decrease of the continuous component of the current and its zero crossing. This is the case described in French Patent Document No. 2,684,486, which is considered to be the closest state of the art.

Ces solutions nécessitent l'emploi d'appareils nouveaux. Le but de la présente invention est de résoudre le problème de la coupure de courants de défaut à passage par zéro retardé avec uniquement des chambres de coupures classiques, le disjoncteur conforme à l'invention ne nécessitant qu'une modification de l'appareillage de commande particulièrement simple.These solutions require the use of devices new. The purpose of the present invention is to solve the problem of breaking fault currents passing through zero delayed with only interrupt chambers conventional, the circuit breaker according to the invention does not requiring that a modification of the switchgear particularly simple operation.

Conformément à l'invention, le disjoncteur comporte des moyens de diminution du débit de soufflage adaptés pour que le soufflage soit prolongé jusqu'à un instant t2 compris entre tzmax-T et tzmax+T.According to the invention, the circuit breaker comprises means for reducing the blowing flow rate suitable for that the blowing be extended to an instant t2 included between tzmax-T and tzmax + T.

Cet agencement a pour avantage de ne nécessiter aucun dispositif de détection intelligente du courant de défaut et d'être totalement automatique.The advantage of this arrangement is that it does not require any intelligent fault current detection device and to be fully automatic.

De préférence, l'instant t2 est sensiblement égal à tzmax.Preferably, the instant t2 is substantially equal to tzmax.

Selon des considérations pratiques, le temps t2-t0 est sensiblement égal à 7 pseudo-périodes. According to practical considerations, the time t2-t0 is substantially equal to 7 pseudo-periods.

Dans le cas où les moyens de soufflage sont constitués d'un piston coopérant par déplacement relatif avec un équipage mobile portant un contact d'arc mobile et soumis à un déplacement normal d'ouverture à une vitesse normale d'ouverture définie par les conditions de fonctionnement normal, les moyens de diminution du débit de soufflage sont des moyens de ralentissement de l'équipage mobile à partir d'un seuil d de son déplacement normal.In the case where the blowing means are constituted of a piston cooperating by relative displacement with a moving part carrying a moving arcing contact and subjected to normal opening movement at normal speed opening defined by the operating conditions normal, the means for reducing the blowing flow are means for slowing the moving crew from of a threshold d of its normal displacement.

De préférence, le seuil d est compris entre 2D/3 et D, D étant la course totale normale de l'équipage mobile.Preferably, the threshold d is between 2D / 3 and D, D being the normal total travel of the moving part.

Avantageusement, le ralentissement de l'équipage mobile est effectué à vitesse constante.Advantageously, the slowdown of the crew mobile is performed at constant speed.

Dans le cas d'un disjoncteur comportant un vérin hydraulique entraínant l'équipage mobile et comportant un piston relié à un cône d'amortissement coopérant avec une bague, avantageusement les moyens de ralentissement consistent en une partie cylindrique disposée entre le piston et le cône, la bague étant réglée pour obtenir un certain jeu radial entre elle et la partie cylindrique.In the case of a circuit breaker comprising a jack hydraulic driving the moving part and comprising a piston connected to a damping cone cooperating with a ring, advantageously the slowing means consist of a cylindrical part arranged between the piston and cone, the ring being adjusted to obtain a certain radial clearance between it and the cylindrical part.

L'invention est décrite ci-après plus en détail à l'aide de figures ne représentant qu'un mode de réalisation préféré de l'invention.The invention is described below in more detail at using figures representing only one embodiment preferred of the invention.

La figure 1 est un graphe montrant les variations d'un courant alternatif à passage par zéro retardé.Figure 1 is a graph showing the variations of a delayed zero-crossing alternating current.

La figure 2 est une vue en coupe longitudinale partielle d'un disjoncteur classique.Figure 2 is a longitudinal sectional view partial view of a conventional circuit breaker.

La figure 3 est un graphe représentant en fonction du temps le déplacement du contact d'arc mobile d'un disjoncteur conforme à l'invention selon une première variante.Figure 3 is a graph representing as a function of time the displacement of the movable arcing contact of a circuit breaker according to the invention according to a first variant.

La figure 4 est un graphe représentant en fonction du temps le déplacement du contact d'arc mobile d'un disjoncteur conforme à l'invention selon une seconde variante. Figure 4 is a graph representing as a function of time the displacement of the movable arcing contact of a circuit breaker according to the invention according to a second variant.

La figure 5 est une vue en coupe longitudinale de l'extrémité d'un vérin hydraulique comportant des moyens de ralentissement conformément à l'invention.Figure 5 is a longitudinal sectional view of the end of a hydraulic cylinder comprising means for slowing down according to the invention.

L'oscillogramme de la figure 1 montre le courant de défaut avec le passage par zéro du courant retardé. En abscisses est représenté le temps et en ordonnées l'intensité du courant.The oscillogram of figure 1 shows the current of fault with zero crossing of the delayed current. In abscissa is represented time and on the ordinate the intensity of the current.

Le courant de défaut apparaít à l'instant t0 et contribue à retarder le passage suivant par zéro jusqu'à un certain instant. De tels comportements sont déterminés par essais et/ou simulations et il est donc possible de déterminer, pour un réseau donné et les courants de défaut prévus, le laps de temps maximal avant le passage par zéro et donc l'instant tzmax de ce passage par zéro.The fault current appears at time t0 and helps delay the next pass by zero to one certain moment. Such behaviors are determined by tests and / or simulations and it is therefore possible to determine, for a given network and the fault currents expected, the maximum time before zero crossing and therefore the instant tzmax of this zero crossing.

A l'apparition du courant de défaut à l'instant t0, l'ordre d'ouverture du disjoncteur est lancé et ce dernier s'ouvre à l'instant t1.When the fault current appears at time t0, the circuit breaker opening order is started and the latter opens at time t1.

Une chambre de coupure d'un disjoncteur conforme à l'invention capable de couper de tels courants de défaut est représenté sur la figure 2. Il s'agit d'une chambre classique comportant dans une enveloppe isolante 10 les éléments de coupure comprenant un premier tube métallique 2 constituant le contact principal fixe et un second tube 3 coaxial au premier et formant le contact d'arc fixe. Ces deux contacts sont reliés à une première prise de courant. L'enveloppe est remplie d'un gaz à bonnes propriétés diélectriques tel que l'hexafluorure de soufre sous une pression de quelques bars.A breaker chamber of a circuit breaker conforming to the invention capable of breaking such fault currents is shown in Figure 2. This is a room conventional comprising in an insulating envelope 10 the cut-off elements comprising a first metal tube 2 constituting the main fixed contact and a second tube 3 coaxial with the first and forming the fixed arcing contact. These two contacts are connected to a first socket. The envelope is filled with a gas with good properties dielectrics such as sulfur hexafluoride under a pressure of a few bars.

L'équipage mobile comprend un tube métallique 4 prolongé par un capot pare-effluves 5 et pourvu d'une cloison métallique 8 transversale portant des doigts de contact 6 constituant le contact principal mobile et un tube de soufflage 7 prolongé par des doigts de contact 8 constituant le contact d'arc mobile. La cloison 8 est percée de trous pour le passage du gaz de soufflage et porte une buse de soufflage 9 en matériau isolant. Le soufflage est assuré par un piston fixe 11 disposé à l'intérieur du tube 4. Ce tube 4 est relié à une seconde prise de courant.The moving part includes a metal tube 4 extended by a corona hood 5 and provided with a transverse metal partition 8 carrying fingers contact 6 constituting the movable main contact and a tube blowing 7 extended by contact fingers 8 constituting the movable arcing contact. Partition 8 is drilled holes for the blowing gas passage and carries a blowing nozzle 9 made of insulating material. The blowing is provided by a fixed piston 11 disposed inside the tube 4. This tube 4 is connected to a second socket.

Le disjoncteur comporte par phase une pluralité de telles chambres de coupure.The circuit breaker comprises, per phase, a plurality of such breaking chambers.

Le déplacement de l'équipage mobile est défini sur les graphes représentés sur les figures 3 et 4.The movement of the moving part is defined on the graphs shown in Figures 3 and 4.

Les chambres de coupure en série sont équipées de moyens pour s'ouvrir à un instant t1 ultérieur à l'instant du défaut t0 et de moyens de soufflage de l'arc fonctionnant entre l'instant t1 et un instant ultérieur.The series switching chambers are equipped with means for opening at an instant t1 subsequent to the instant fault t0 and arc blowing means operating between time t1 and a later time.

De façon classique, l'équipage mobile est soumis à un déplacement normal d'ouverture à une vitesse normale d'ouverture définie par les conditions de fonctionnement normal et ce déplacement s'interrompt à l'instant tc représenté sur les figures. Conformément à l'invention, le déplacement de l'équipage mobile est modifié à partir d'un seuil d de son déplacement normal pour se terminer à l'instant t2 compris entre tzmax-T et tzmax+T et avantageusement t2 est sensiblement égal à tzmax.Conventionally, the mobile assembly is subjected to a normal opening movement at normal speed opening defined by the operating conditions normal and this movement stops at time tc shown in the figures. In accordance with the invention, the movement of the moving crew is changed from a threshold d of its normal displacement to end at the instant t2 between tzmax-T and tzmax + T and advantageously t2 is substantially equal to tzmax.

Selon la première variante représentée sur le graphe 3, le seuil d est de préférence compris entre 2D/3 et D. A ce seuil d, l'équipage mobile est ralenti à une vitesse de préférence constante afin d'atteindre la course totale D à l'instant t2.According to the first variant represented on the graph 3, the threshold d is preferably between 2D / 3 and D. A this threshold d, the moving assembly is slowed down to a speed of constant preference in order to reach the total stroke D at time t2.

Selon la seconde variante représentée sur la figure 4, le seuil d est égal à la course totale normale d'ouverture D. La course totale D' est alors augmentée et est supérieure à D.According to the second variant shown in FIG. 4, the threshold d is equal to the normal total opening stroke D. The total stroke D 'is then increased and is greater to D.

Des variantes intermédiaires sont également envisageables, en modifiant la vitesse de ralentissement et/ou la course totale de l'équipage mobile.Intermediate variants are also possible, by modifying the speed of deceleration and / or the total travel of the moving crew.

Dans de telles conditions, à l'ouverture des contacts à l'instant t1, un arc se crée entre les contacts d'arc 3, 8 et en cas de défaut normal, il est soufflé par le gaz de soufflage de façon classique. Si le défaut est à passage par zéro retardé, le soufflage continuant jusqu'à l'instant t2 correspondant au cas le plus défavorable, l'arc peut être également soufflé.In such conditions, when the contacts are opened at time t1, an arc is created between the arcing contacts 3, 8 and in the event of a normal fault, it is blown by conventional blowing. If the fault is passing through delayed zero, blowing continuing until time t2 corresponding to the worst case, the arc can be also blown.

Des études d'essais et de simulations ont montré que, dans la pratique, le temps t2 est de préférence sensiblement égal à 110 millisecondes.Test and simulation studies have shown that, in practice, the time t2 is preferably substantially equal to 110 milliseconds.

Suivant toutes les variantes possibles, la modification du déplacement de l'équipage mobile peut être réalisée de façons diverses.According to all possible variants, the modification of the movement of the moving part can be performed in various ways.

Le mode de réalisation préféré des moyens de ralentissement de l'équipage mobile, celui-ci étant déplacé grâce à un vérin hydraulique, est représenté sur la figure 5.The preferred embodiment of the means of slowing down of the moving part, the latter being moved thanks to a hydraulic cylinder, is shown in the figure 5.

Cette figure représente le vérin hydraulique en position de déclenchement c'est-à-dire d'ouverture des contacts. Le piston 20 du vérin est en fin de course. Pour arriver à cette position, l'ordre d'ouverture a été transmis par une bobine de commande entraínant l'évacuation d'un fluide sous pression par le clapet 21. La valve coulissante 22, libérée de la poussée du coulisseau 23, s'est donc déplacée vers la droite (selon la figure) sous l'action de son ressort de rappel 24. Elle a donc fermée le passage de l'huile sous pression par le canal 25 alimenté par l'arrivée 32 et l'huile sous pression qui maintenait le piston 20 en position haute correspondante à la position fermée des contacts s'est évacuée par le canal 26 libéré par le coulisseau 23.This figure shows the hydraulic cylinder in trigger position, i.e. opening of contacts. The piston 20 of the jack is at the end of the stroke. For arrive at this position, the opening order has been transmitted by a control coil causing the evacuation of a fluid under pressure by the valve 21. The sliding valve 22, released from the thrust of the slide 23, is therefore moved to the right (according to the figure) under the action of its return spring 24. It therefore closed the passage of oil under pressure through channel 25 supplied by the inlet 32 and the oil under pressure which kept the piston 20 in high position corresponding to the closed position of contacts was evacuated through channel 26 released by the slide 23.

De façon classique, le piston 20 est équipé d'un cône d'amortissement 27 qui, lors de l'ouverture, coopère avec une bague 28 montée dans son logement avec un jeu longitudinal et présentant également un jeu radial. Cet agencement a pour fonction, en fin d'ouverture de ralentir le piston 20 selon le tronçon de courbe A des figures 3 ou 4. Le jeu de la bague 28 permet d'une part son auto-ajustement autour du cône 27 et d'autre part le passage de l'huile entre elle et le cône 27. Conventionally, the piston 20 is equipped with a cone damping 27 which, when opened, cooperates with a ring 28 mounted in its housing with a clearance longitudinal and also having a radial clearance. This arrangement has the function, at the end of opening to slow down the piston 20 along the curve section A of Figures 3 or 4. The clearance of the ring 28 allows on the one hand its self-adjustment around the cone 27 and on the other hand the passage of the oil between it and the cone 27.

Les moyens de ralentissement conformes à l'invention consistent en une partie cylindrique 29 disposée entre le piston 20 et le cône 27 et de préférence solidaire de ce dernier. Cette partie cylindrique 29 est de longueur 1. La bague 28 est réglée pour obtenir un certain jeu radial j entre elle et la partie cylindrique 29.The slowdown means according to the invention consist of a cylindrical part 29 disposed between the piston 20 and the cone 27 and preferably integral with this latest. This cylindrical part 29 is of length 1. The ring 28 is adjusted to obtain a certain radial clearance j between it and the cylindrical part 29.

Ainsi lors de l'ouverture, le déplacement des contacts est tout d'abord ralenti de façon classique par le cône 27 selon le tronçon de courbe A, puis ralenti à vitesse constante compte-tenu du jeu j choisi et durant un temps t2-tc compte-tenu de la longueur 1 choisie selon le tronçon de droite B représenté sur les figures 3 ou 4.So when opening, moving the contacts is first of all slowed down conventionally by the cone 27 along the section of curve A, then slowed down to speed constant taking into account the game j chosen and for a time t2-tc taking into account the length 1 chosen according to the section of line B shown in Figures 3 or 4.

La mise en oeuvre de l'invention nécessite donc une adaptation minime d'un disjoncteur existant.The implementation of the invention therefore requires a minimal adaptation of an existing circuit breaker.

Cette adaptation est particulièrement limitée pour la mise en oeuvre de l'invention selon la courbe de la figure 3. Il suffit alors d'installer le cône d'amortissement 27 équipé de la partie cylindrique 29 sur le piston 20 existant, le carter 30 devant alors être allongé.This adaptation is particularly limited for the implementation of the invention according to the curve of the figure 3. Then just install the damping cone 27 fitted with the cylindrical part 29 on the piston 20 existing, the casing 30 then having to be extended.

Dans le cas de la mise en oeuvre de la courbe de la figure 4, la course du piston 20 doit également être allongée et en conséquence sa tige et la chambre 31.In the case of the implementation of the curve of the Figure 4, the stroke of the piston 20 must also be elongated and consequently its rod and the chamber 31.

Plusieurs chambres de coupure peuvent être utilisés selon les caractéristiques du réseau. Dans la pratique, au moins quatre chambres peuvent être prévues. A titre d'exemple, quatre chambres seront prévues pour une ligne d'une tension de 800kV.Several switching chambers can be used according to the characteristics of the network. In practice, at at least four rooms can be provided. As example, four rooms will be provided for one line with a voltage of 800kV.

Aucun dispositif de détection intelligente des différentes phases du courant de défaut n'est donc nécessaire et les chambres de coupure fonctionnent normalement en deux cycles à l'ouverture.No intelligent device detection different phases of the fault current is therefore necessary and the interrupting chambers are working normally in two opening cycles.

Claims (7)

  1. A high tension circuit breaker capable of interrupting alternating fault currents of pseudo-period T and having a delayed zero crossing. said currents passing through zero after a maximum time lapse tzmax-t0 after the instant t0 on which the fault appears, said time lapse tzmax-t0 being determined by simulation or by testing. the circuit breaker comprising a plurality of interrupting chambers (1) in series fitted with means for causing them to open at an instant t1 subsequent to the fault instant t0, and with arc blasting means designed to operate between the instant t1 and an instant tc earlier than the instant tzmax-T, the circuit breaker being characterized in that it includes blast flow rate reducing means adapted to cause blasting to be extended to an instant t2 lying in the range tzmax-T and tzmax+T.
  2. A circuit breaker according to claim 1, characterized in that the instant t2 is substantially equal to tzmax.
  3. A circuit breaker according to either preceding claim, characterized in that the time t2-t0 is substantially equal to seven pseudo-periods.
  4. A circuit breaker according to any preceding claim. in which the blast means are constituted by a piston (11) co-operating by displacement relative to moving equipment carrying a moving arcing contact (8) and subjected to normal opening displacement at a normal opening speed defined by normal operating conditions, characterized in that the blast flow rate reducing means are slowing-down means for slowing down the moving equipment beyond a threshold displacement d.
  5. A circuit breaker according to claim 4, characterized in that the threshold d lies in the range 2D/3 and D, where D is the total normal stroke of the moving equipment.
  6. A circuit breaker according to claim 4 or 5, characterized in that when slowed down. the moving equipment moves at constant speed.
  7. A circuit breaker according to claim 6, including a hydraulic actuator driving the moving equipment and including a piston (20) connected to a damping cone (27) co-operating with a ring (28). characterized in that the slowing-down means are constituted by a length of cylinder portion (29) disposed between the piston (20) and the cone (27), the ring (28) being adjusted to obtain a certain amount of radial clearance (j) between itself and the length of cylinder (29).
EP94402269A 1993-10-12 1994-10-10 High voltage circuit breaker capable of interrupting fault currents with delayed zero-crossings Expired - Lifetime EP0647955B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9312118A FR2711269B1 (en) 1993-10-12 1993-10-12 High voltage circuit breaker capable of breaking delayed zero crossing fault currents.
FR9312118 1993-10-12

Publications (2)

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EP0647955A1 EP0647955A1 (en) 1995-04-12
EP0647955B1 true EP0647955B1 (en) 1998-12-16

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EP94402269A Expired - Lifetime EP0647955B1 (en) 1993-10-12 1994-10-10 High voltage circuit breaker capable of interrupting fault currents with delayed zero-crossings

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US (1) US5510591A (en)
EP (1) EP0647955B1 (en)
CN (1) CN1043386C (en)
AT (1) ATE174720T1 (en)
BR (1) BR9404059A (en)
CA (1) CA2117836C (en)
DE (1) DE69415259T2 (en)
FR (1) FR2711269B1 (en)
TR (1) TR28008A (en)

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EP0721197B1 (en) * 1995-01-06 2002-03-06 Gec Alsthom T & D Sa Circuit breaker with two interrupting units per phase
JP3589061B2 (en) * 1999-01-25 2004-11-17 株式会社日立製作所 Vacuum switchgear and method for opening and closing vacuum switchgear
SE516437C2 (en) * 2000-06-07 2002-01-15 Abb Ab Method, apparatus, apparatus and use, computer program with computer product for predicting a zero passage of an AC
US20090260407A1 (en) * 2006-12-04 2009-10-22 Rodney Henson Locking assembly
JP5389279B2 (en) * 2011-01-07 2014-01-15 三菱電機株式会社 Switchgear
TW201442051A (en) * 2013-03-08 2014-11-01 Hitachi Ltd Gas blast circuit breaker
EP3213399B1 (en) * 2014-10-30 2020-12-30 ABB Power Grids Switzerland AG Method in, apparatus for, and interface arrangement between an alternating current power system and a direct current power system

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DE555589C (en) * 1929-09-14 1932-07-27 Bernh Draeger Process for making carbon dioxide recognizable by means of a reagent paper
DE599314C (en) * 1932-03-16 1934-07-30 Bbc Brown Boveri & Cie Switch with arc extinguishing by flowing compressed gas
DE1665937A1 (en) * 1967-04-28 1971-04-08 Sachsenwerk Licht & Kraft Ag Fire chamber for low-liquid electrical circuit breakers
US3659065A (en) * 1970-03-06 1972-04-25 Westinghouse Electric Corp Fluid-blast circuit interrupter with delayed moving contact travel
CH555589A (en) * 1973-07-12 1974-10-31 Sprecher & Schuh Ag HIGH VOLTAGE SWITCHES, IN PARTICULAR PRESSURE GAS SWITCHES.
JPS5422581A (en) * 1977-07-21 1979-02-20 Mitsubishi Electric Corp Switching device
US4159498A (en) * 1977-11-17 1979-06-26 General Electric Company Electric circuit breaker with high current interruption capability
FR2641643B1 (en) * 1989-01-10 1991-03-22 Alsthom Gec HIGH OR MEDIUM VOLTAGE CIRCUIT BREAKER
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FR2681724B1 (en) * 1991-09-24 1997-01-31 Alsthom Gec HIGH VOLTAGE CIRCUIT BREAKER WITH HIGH ARC VOLTAGE.
FR2683937B1 (en) * 1991-11-20 1993-12-31 Gec Alsthom Sa HYBRID CIRCUIT BREAKER FOR CURRENT CURRENT WITH LARGE CONTINUOUS COMPONENT.
FR2684486B1 (en) * 1991-11-29 1994-01-07 Gec Alsthom Sa HIGH VOLTAGE AC CIRCUIT BREAKER WITH LC CIRCUIT.
FR2694127B1 (en) * 1992-07-24 1994-08-19 Alsthom Gec Circuit breaker with two concentric breaking chambers.

Also Published As

Publication number Publication date
CA2117836C (en) 1998-12-29
FR2711269B1 (en) 1995-12-29
DE69415259T2 (en) 1999-08-12
BR9404059A (en) 1995-07-18
EP0647955A1 (en) 1995-04-12
ATE174720T1 (en) 1999-01-15
DE69415259D1 (en) 1999-01-28
US5510591A (en) 1996-04-23
TR28008A (en) 1995-11-14
FR2711269A1 (en) 1995-04-21
CN1043386C (en) 1999-05-12
CN1105147A (en) 1995-07-12
CA2117836A1 (en) 1995-04-13

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