EP0848404B1 - Selective tripping block for multipole circuit breaker - Google Patents

Selective tripping block for multipole circuit breaker Download PDF

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Publication number
EP0848404B1
EP0848404B1 EP97410137A EP97410137A EP0848404B1 EP 0848404 B1 EP0848404 B1 EP 0848404B1 EP 97410137 A EP97410137 A EP 97410137A EP 97410137 A EP97410137 A EP 97410137A EP 0848404 B1 EP0848404 B1 EP 0848404B1
Authority
EP
European Patent Office
Prior art keywords
armature
movable
magnetic armature
blade
block 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
Application number
EP97410137A
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German (de)
French (fr)
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EP0848404A1 (en
Inventor
Serge Terpend
Pierre Batteux
Olivier Dujeu
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 Industries SAS
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Schneider Electric Industries SAS
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Publication date
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Publication of EP0848404A1 publication Critical patent/EP0848404A1/en
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Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/44—Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/34—Electromagnetic mechanisms having two or more armatures controlled by a common winding

Definitions

  • the timing means adapted to a chronometric selectivity of the protection are generally formed by inertial devices making use of at least one flyweight.
  • the counterweight is mounted on a lever control articulated on a different axis from that of the mobile magnetic armature.
  • the assembly and adjustment of such a device remain complicated.
  • the object of the invention is to provide a selective trigger block for simplified construction, and compact.
  • the trigger block according to the invention is characterized in that the means for time delay comprise a damping member mounted on the magnetic armature mobile, and likely to be in an inactive state up to a position non-triggering intermediate during the attraction of the magnetic armature movable by pole pieces of the fixed magnetic frame during a first stroke, the transition to the active state resulting from a deformation of the damping member during a second stroke of the movable armature between the intermediate position, and the final position of attraction causing the tripping of the circuit breaker.
  • the means for time delay comprise a damping member mounted on the magnetic armature mobile, and likely to be in an inactive state up to a position non-triggering intermediate during the attraction of the magnetic armature movable by pole pieces of the fixed magnetic frame during a first stroke, the transition to the active state resulting from a deformation of the damping member during a second stroke of the movable armature between the intermediate position, and the final position of attraction causing the tripping of the circuit breaker.
  • the mobile magnetic armature is mounted at pivoting on a stirrup fixed to a conductor, and which the damping member comprises a thin metal blade, arranged in a gap between the frame mobile and said bracket.
  • the damper blade includes a base clipped onto a projection on the caliper, and a upper part cooperating with a drive member of the magnetic armature mobile.
  • the fixed bracket is equipped with lateral tabs arranged to define the rest position of the movable magnetic armature, and said blade housing interval.
  • the elastic return member of the movable frame is advantageously formed by a compression spring arranged on the opposite side of the interval between the base of the stirrup, and a flange of the frame.
  • the mounting of the selective magnetic trip unit is particularly simplified, being given that the caliper, the damper blade, the movable magnetic frame, and the compression spring constitutes a pre-assembled sub-assembly, and fixed by a screw on the driver.
  • a trip unit 10 for an electric circuit breaker multipolar (not shown) comprises an insulating housing 11 containing means 12 control of the intensity of the current passing through each pole, and a bar of trigger 14 common.
  • An energy accumulator mechanism 16 with striker cooperates with the trigger bar 14 to cause the unlocking of the circuit breaker control mechanism in the event of detection of a short-circuit current by the trigger block 10.
  • the trigger bar 14 is mounted at limited rotation in bearings of the housing 11, and is movable between a position army allowing the closing of the circuit breaker, and a triggered position causing automatic opening of circuit breaker contacts after release of the mechanism energy store 16.
  • control means for each pole include a selective magnetic trigger 18 composed of a fixed magnetic armature 20 in U shape arranged opposite a movable magnetic frame 22 also in U-shaped.
  • the fixed magnetic frame 20 is crossed by a conductor 24 in form of bar in which the current to be monitored flows.
  • Driver 24 includes a pair of connection pads 26, 28 at its opposite ends, and an intermediate part folded into a V so as to form an obtuse angle.
  • Branch horizontal 24a of the conductor 24 is fixed by a screw 30 to the base of the housing 11 insulator, while the other inclined branch 24b is applied against the bottom and at the interior of the fixed magnetic frame 20.
  • conductor 24 serves also a driver with a bimetallic strip (not shown) of a thermal trip device, which is not part of the present invention.
  • the movable magnetic frame 22 is mounted with limited pivoting on the base 32 a fixed metal stirrup 34, which is secured to the branch 24a of the conductor 24 by screw 30.
  • a compression spring 36 is interposed between the base 32 and a rim 38 of the movable magnetic armature 22, and urges the latter towards a position apart from rest so as to provide a maximum air gap 40 between the movable frame 22 and the pole faces of the fixed frame 20.
  • the movable frame 22 has two parallel legs 42,44 (see FIG. 7) provided with its lower ends of two lugs 46,48 positioned in cutouts of two lateral flanges 50.52 of the stirrup 34 to constitute the pivot axis 53 of the movable frame 22.
  • the stirrup 34 is additionally equipped with a pair of lateral tabs 54 against which the movable armature 22 comes into engagement in the separated position, so as to provide an interval 56 (FIGS. 3 and 6) for housing an organ shock absorber 58.
  • the damping member 58 comprises a thin metal blade, the base is clipped onto a projection 60 of the stirrup 34, while the upper part of the blade plays through a bracelet 62 of the movable frame 22.
  • the base of the blade has a width slightly greater than the transverse spacing of the flanges 50, 52 of the stirrup 34.
  • the movable frame 22, the spring 36, and the blade 58 are mounted on the bracket 34 so as to constitute a pre-assembled sub-assembly ( Figure 6) and ready to be incorporated in the housing 11.
  • the trigger bar 14 is located above the magnetic triggers 18 selective of the three poles, and includes actuation levers 64 likely to be driven individually by the movable magnetic armature 22 of each trigger when it is moved by magnetic attraction against the faces of the fixed armature 20.
  • a hooking lever 66 also equips the bar trigger 14 to lock or release the accumulator mechanism energy 16 respectively in the armed position, and in the triggered position.
  • FIG. 3 shows the magnetic trigger 18 in the inactive state in the absence of network fault.
  • the return force of the spring 36 is permanently greater than the magnetic attraction force in the air gap 40 due to the passage of the nominal current in the conductor 24.
  • the movable magnetic armature 22 is in abutment against the legs 54 of the fixed stirrup 34, and the lever 64 is separated from the movable frame 22 by a predetermined distance.
  • the trigger bar 14 remains immobilized in position armed by a bias spring (not shown), and the lever hooking 66 ensures the locking of the energy accumulator mechanism 16.
  • the compression spring 36 extends substantially in a direction perpendicular to the horizontal branch 24a of the conductor 24, and the blade of the damper 58 is located in the meantime 56 in a non-deformed state, and placed against the magnetic frame mobile 22.
  • the blade damper 58 acts as a brake preventing displacement of the movable armature 22 beyond the intermediate position.
  • the triggering of downstream circuit breaker thus keeps the upstream circuit breaker closed, the upstream circuit breaker that associated with the selective magnetic trip 18.
  • the displacement of the armature mobile 22 from the rest position to the intermediate position intervenes as soon as the current exceeds a threshold corresponding to the setting of spring 36.
  • the deformation of the blade of the shock absorber 58 generates a time delay before the effective trip of the circuit breaker associated with the trip unit magnetic 18 selective. This amortization delay depends on the intensity and the duration of the short-circuit current, and ensures total selectivity of the protection.
  • FIGS. 9 and 10 a spring of compression 70 is secured to the upper end of the magnetic frame movable 22, so as to abut against the conductor 24 when the armature mobile 22 is in the intermediate position. Triggering is possible during the attraction of the movable frame 22 against the pole faces of the fixed frame 20, and after compression of the spring 70.
  • the damper is formed by a spring of torsion 72 mounted on the pivot axis 53 of the movable magnetic armature 22.
  • the spring 72 remains inactive up to the intermediate position of the movable armature 22, and is then bandaged during the continued movement to the final position of attraction.

Landscapes

  • Breakers (AREA)
  • Braking Arrangements (AREA)
  • Electromagnets (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Description

L'invention est relative à un bloc de déclenchement pour un disjoncteur électrique multipolaire comprenant un déclencheur magnétique sélectif par pôle, ledit bloc de déclenchement comportant :

  • une armature magnétique fixe en forme de U disposée en regard d'une armature magnétique mobile avec interposition d'un entrefer,
  • un conducteur associé à l'armature magnétique fixe, et traversé par le courant du pôle correspondant,
  • un organe élastique sollicitant l'armature magnétique mobile vers une position écartée de repos correspondant à l'entrefer maximum,
  • et des moyens de temporisation coopérant avec l'armature magnétique mobile pour assurer une sélectivité chronométrique de la protection.
The invention relates to a trip block for a multi-pole electric circuit breaker comprising a selective magnetic trip device per pole, said trip block comprising:
  • a fixed U-shaped magnetic armature placed opposite a mobile magnetic armature with the interposition of an air gap,
  • a conductor associated with the fixed magnetic armature, and crossed by the current of the corresponding pole,
  • an elastic member urging the movable magnetic armature towards a spaced apart position corresponding to the maximum air gap,
  • and timing means cooperating with the movable magnetic armature to ensure a chronometric selectivity of the protection.

Les moyens de temporisation adaptés à une sélectivité chronométrique de la protection sont généralement formés par des dispositifs à inertie faisant usage d'au moins une masselotte. Selon un dispositif connu, la masselotte est montée sur un levier de commande articulé sur un axe différent de celui de l'armature magnétique mobile. Outre le problème de l'inertie des pièces en mouvement, les opérations de montage et de réglage d'un tel dispositif restent compliquées.The timing means adapted to a chronometric selectivity of the protection are generally formed by inertial devices making use of at least one flyweight. According to a known device, the counterweight is mounted on a lever control articulated on a different axis from that of the mobile magnetic armature. In addition to the problem of inertia of moving parts, the assembly and adjustment of such a device remain complicated.

L'objet de l'invention consiste à réaliser un bloc de déclenchement sélectif de construction simplifiée, et à encombrement compact.The object of the invention is to provide a selective trigger block for simplified construction, and compact.

Le bloc de déclenchement selon l'invention est caractérisé en ce que les moyens de temporisation comportent un organe amortisseur monté sur l'armature magnétique mobile, et susceptible de se trouver dans un état inactif jusqu'à une position intermédiaire de non déclenchement lors de l'attraction de l'armature magnétique mobile par des pièces polaires de l'armature magnétique fixe durant une première course, le passage vers l'état actif résultant d'une déformation de l'organe amortisseur pendant une deuxième course de l'armature mobile entre la position intermédiaire, et la position finale d'attraction provoquant le déclenchement du disjoncteur.The trigger block according to the invention is characterized in that the means for time delay comprise a damping member mounted on the magnetic armature mobile, and likely to be in an inactive state up to a position non-triggering intermediate during the attraction of the magnetic armature movable by pole pieces of the fixed magnetic frame during a first stroke, the transition to the active state resulting from a deformation of the damping member during a second stroke of the movable armature between the intermediate position, and the final position of attraction causing the tripping of the circuit breaker.

Selon un mode de réalisation préférentiel, l'armature magnétique mobile est montée à pivotement sur un étrier fixé à un conducteur, et que l'organe amortisseur comporte une lame métallique de faible épaisseur, agencée dans un intervalle entre l'armature mobile et ledit étrier.According to a preferred embodiment, the mobile magnetic armature is mounted at pivoting on a stirrup fixed to a conductor, and which the damping member comprises a thin metal blade, arranged in a gap between the frame mobile and said bracket.

La lame de l'amortisseur comprend une base clipsée sur une saillie de l'étrier, et une partie supérieure coopérant avec un organe d'entraínement de l'armature magnétique mobile.The damper blade includes a base clipped onto a projection on the caliper, and a upper part cooperating with a drive member of the magnetic armature mobile.

Selon une caractéristique de l'invention, l'étrier fixe est équipé de pattes latérales agencées pour définir la position de repos de l'armature magnétique mobile, et ledit intervalle de logement de la lame. L'organe élastique de rappel de l'armature mobile est formé avantageusement par un ressort de compression agencé du côté opposé de l'intervalle entre l'embase de l'étrier, et un rebord de l'armature.According to a characteristic of the invention, the fixed bracket is equipped with lateral tabs arranged to define the rest position of the movable magnetic armature, and said blade housing interval. The elastic return member of the movable frame is advantageously formed by a compression spring arranged on the opposite side of the interval between the base of the stirrup, and a flange of the frame.

Le montage du déclencheur magnétique sélectif est particulièrement simplifié, étant donné que l'étrier, la lame de l'amortisseur, l'armature magnétique mobile, et le ressort de compression constitue un sous-ensemble préassemblé, et fixé par une vis sur le conducteur.The mounting of the selective magnetic trip unit is particularly simplified, being given that the caliper, the damper blade, the movable magnetic frame, and the compression spring constitutes a pre-assembled sub-assembly, and fixed by a screw on the driver.

D'autres caractéristiques et avantages seront décrits plus clairement dans la description qui va suivre de différents modes de réalisation de l'invention, donnés à titre d'exemples non limitatifs, et représentés dans les dessins annexés, dans lesquels :

  • la figure 1 est une vue schématique en perspective du bloc de déclenchement selon l'invention, un seul déclencheur magnétique sélectif étant représenté sur le pôle de gauche ;
  • la figure 2 montre à échelle agrandie le déclencheur de la figure 1 après retrait du boitier isolant ;
  • la figure 3 est une vue en coupe selon la ligne 3-3 de la figure 1, l'armature magnétique mobile se trouvant dans la position écartée de repos ;
  • les figures 4 et 5 sont des vues identiques de la figure 3 respectivement dans la position intermédiaire, et dans la position finale de déclenchement de l'armature mobile ;
  • la figure 6 est une vue en perspective du sous-ensemble préassemblé comprenant l'étrier, l'armature mobile, la lame de l'amortisseur, et le ressort de rappel ;
  • la figure 7 est une vue en élévation de la figure 6 ;
  • la figure 8 est une vue en coupe selon la ligne 8-8 de la figure 7 ;
  • les figures 9 et 10 sont des vues schématiques d'une variante de réalisation, respectivement dans la position de repos, et dans la position intermédiaire de l'armature mobile ;
  • les figures 11 et 12 sont des vues schématiques d'une variante de réalisation, respectivement dans la position de repos, et dans la position intermédiaire de l'armature mobile.
Other characteristics and advantages will be described more clearly in the description which follows of different embodiments of the invention, given by way of nonlimiting examples, and represented in the appended drawings, in which:
  • Figure 1 is a schematic perspective view of the trigger block according to the invention, a single selective magnetic trigger being shown on the left pole;
  • Figure 2 shows on an enlarged scale the trigger of Figure 1 after removal of the insulating housing;
  • Figure 3 is a sectional view along line 3-3 of Figure 1, the movable magnetic armature being in the spaced apart position;
  • Figures 4 and 5 are identical views of Figure 3 respectively in the intermediate position, and in the final release position of the movable frame;
  • Figure 6 is a perspective view of the pre-assembled sub-assembly comprising the bracket, the movable frame, the damper blade, and the return spring;
  • Figure 7 is an elevational view of Figure 6;
  • Figure 8 is a sectional view along line 8-8 of Figure 7;
  • Figures 9 and 10 are schematic views of an alternative embodiment, respectively in the rest position, and in the intermediate position of the movable frame;
  • Figures 11 and 12 are schematic views of an alternative embodiment, respectively in the rest position, and in the intermediate position of the movable frame.

Sur la figure 1, un bloc de déclenchement 10 pour un disjoncteur électrique multipolaire (non représenté) comporte un boítier 11 isolant renfermant des moyens de contrôle 12 de l'intensité du courant traversant chaque pôle, et une barre de déclenchement 14 commune. Un mécanisme accumulateur d'énergie 16 à percuteur coopère avec la barre de déclenchement 14 pour provoquer le déverrouillage du mécanisme de commande du disjoncteur en cas de détection d'un courant de court-circuit par le bloc de déclenchement 10. La barre de déclenchement 14 est montée à rotation limitée dans des paliers du boítier 11, et est déplaçable entre une position armée permettant la fermeture du disjoncteur, et une position déclenchée provoquant l'ouverture automatique des contacts du disjoncteur après la libération du mécanisme accumulateur d'énergie 16.In FIG. 1, a trip unit 10 for an electric circuit breaker multipolar (not shown) comprises an insulating housing 11 containing means 12 control of the intensity of the current passing through each pole, and a bar of trigger 14 common. An energy accumulator mechanism 16 with striker cooperates with the trigger bar 14 to cause the unlocking of the circuit breaker control mechanism in the event of detection of a short-circuit current by the trigger block 10. The trigger bar 14 is mounted at limited rotation in bearings of the housing 11, and is movable between a position army allowing the closing of the circuit breaker, and a triggered position causing automatic opening of circuit breaker contacts after release of the mechanism energy store 16.

En référence aux figures 2 à 8, les moyens de contrôle de chaque pôle comportent un déclencheur magnétique 18 sélectif composé d'une armature magnétique fixe 20 en forme de U disposée en regard d'une armature magnétique mobile 22 également en forme de U. L'armature magnétique fixe 20 est traversée par un conducteur 24 en forme de barrette dans laquelle circule le courant à surveiller. Le conducteur 24 comprend une paire de plages de raccordement 26,28 à ses extrémités opposées, et une partie intermédiaire pliée en V de manière à former un angle obtus. La branche horizontale 24a du conducteur 24 est fixée par une vis 30 au socle du boítier 11 isolant, tandis que l'autre branche 24b inclinée est appliquée contre le fond et à l'intérieur de l'armature magnétique fixe 20.With reference to FIGS. 2 to 8, the control means for each pole include a selective magnetic trigger 18 composed of a fixed magnetic armature 20 in U shape arranged opposite a movable magnetic frame 22 also in U-shaped. The fixed magnetic frame 20 is crossed by a conductor 24 in form of bar in which the current to be monitored flows. Driver 24 includes a pair of connection pads 26, 28 at its opposite ends, and an intermediate part folded into a V so as to form an obtuse angle. Branch horizontal 24a of the conductor 24 is fixed by a screw 30 to the base of the housing 11 insulator, while the other inclined branch 24b is applied against the bottom and at the interior of the fixed magnetic frame 20.

Le passage du courant dans le conducteur 24 crée un champ électromagnétique dans l'entrefer ménagé entre l'armature fixe 20 et l'armature mobile 22, et tend à attirer cette dernière contre les faces polaires de l'armature fixe 20 lorsque l'intensité du courant dépasse un seuil de déclenchement prédéterminé. Le conducteur 24 sert également de chauffeur à une bilame (non représentée) d'un déclencheur thermique, lequel ne fait pas partie de la présente invention. The passage of current through conductor 24 creates an electromagnetic field in the air gap formed between the fixed frame 20 and the movable frame 22, and tends to attract the latter against the pole faces of the fixed armature 20 when the intensity of the current exceeds a predetermined trip threshold. Conductor 24 serves also a driver with a bimetallic strip (not shown) of a thermal trip device, which is not part of the present invention.

L'armature magnétique mobile 22 est montée à pivotement limité sur l'embase 32 d'un étrier 34 métallique fixe, lequel est solidarisé à la branche 24a du conducteur 24 par la vis 30. Un ressort de compression 36 est intercalé entre l'embase 32 et un rebord 38 de l'armature magnétique mobile 22, et sollicite cette dernière vers une position écartée de repos de manière à ménager un entrefer 40 maximum entre l'armature mobile 22 et les faces polaires de l'armature fixe 20.The movable magnetic frame 22 is mounted with limited pivoting on the base 32 a fixed metal stirrup 34, which is secured to the branch 24a of the conductor 24 by screw 30. A compression spring 36 is interposed between the base 32 and a rim 38 of the movable magnetic armature 22, and urges the latter towards a position apart from rest so as to provide a maximum air gap 40 between the movable frame 22 and the pole faces of the fixed frame 20.

L'armature mobile 22 comporte deux jambes 42,44 parallèles (voir figure 7) munies à ses extrémités inférieures de deux ergots 46,48 positionnés dans des découpes de deux flasques 50,52 latéraux de l'étrier 34 pour constituer l'axe de pivotement 53 de l'armature mobile 22. L'étrier 34 est équipé en plus d'une paire de pattes 54 latérales contre lesquelles l'armature mobile 22 vient en engagement en position écartée, de manière à ménager un intervalle 56 (figures 3 et 6) de logement d'un organe amortisseur 58.The movable frame 22 has two parallel legs 42,44 (see FIG. 7) provided with its lower ends of two lugs 46,48 positioned in cutouts of two lateral flanges 50.52 of the stirrup 34 to constitute the pivot axis 53 of the movable frame 22. The stirrup 34 is additionally equipped with a pair of lateral tabs 54 against which the movable armature 22 comes into engagement in the separated position, so as to provide an interval 56 (FIGS. 3 and 6) for housing an organ shock absorber 58.

L'organe amortisseur 58 comprend une lame métallique de faible épaisseur dont la base est clipsée sur une saillie 60 de l'étrier 34, tandis que la partie supérieure de la lame traverse à jeu un bracelet 62 de l'armature mobile 22. La base de la lame présente une largeur légèrement supérieure à l'écartement transversal des flasques 50,52 de l'étrier 34. L'armature mobile 22, le ressort 36, et la lame 58 sont montés sur l'étrier 34 de manière à constituer un sous-ensemble préassemblé (figure 6) et prêt à être incorporé dans le boítier 11.The damping member 58 comprises a thin metal blade, the base is clipped onto a projection 60 of the stirrup 34, while the upper part of the blade plays through a bracelet 62 of the movable frame 22. The base of the blade has a width slightly greater than the transverse spacing of the flanges 50, 52 of the stirrup 34. The movable frame 22, the spring 36, and the blade 58 are mounted on the bracket 34 so as to constitute a pre-assembled sub-assembly (Figure 6) and ready to be incorporated in the housing 11.

La barre de déclenchement 14 est située au-dessus des déclencheurs magnétiques 18 sélectifs des trois pôles, et comporte des leviers d'actionnement 64 susceptibles d'être entraínés individuellement par l'armature magnétique mobile 22 de chaque déclencheur lors de son déplacement par attraction magnétique contre les faces polaires de l'armature fixe 20. Un levier d'accrochage 66 équipe également la barre de déclenchement 14 pour verrouiller ou libérer le mécanisme accumulateur d'énergie 16 respectectivement en position armée, et en position déclenchée.The trigger bar 14 is located above the magnetic triggers 18 selective of the three poles, and includes actuation levers 64 likely to be driven individually by the movable magnetic armature 22 of each trigger when it is moved by magnetic attraction against the faces of the fixed armature 20. A hooking lever 66 also equips the bar trigger 14 to lock or release the accumulator mechanism energy 16 respectively in the armed position, and in the triggered position.

Le fonctionnement du déclencheur magnétique 18 sélectif de chaque pôle est le suivant :The operation of the selective magnetic trigger 18 of each pole is the next :

La figure 3 montre le déclencheur magnétique 18 dans l'état inactif en l'absence de défaut sur le réseau. La force de rappel du ressort 36 est supérieure en permanence à la force d'attraction magnétique dans l'entrefer 40 due au passage du courant nominal dans le conducteur 24. L'armature magnétique mobile 22 se trouve en butée contre les pattes 54 de l'étrier 34 fixe, et le levier 64 est séparé de l'armature mobile 22 par une distance prédéterminée. La barre de déclenchement 14 reste immobilisée en position armée par un ressort de polarisation (non représenté), et le levier d'accrochage 66 assure le verrouillage du mécanisme accumulateur d'énergie 16. Le ressort de compression 36 s'étend sensiblement selon une direction perpendiculaire à la branche horizontale 24a du conducteur 24, et la lame de l'amortisseur 58 se trouve dans l'intervalle 56 dans un état non déformé, et accolé contre l'armature magnétique mobile 22.FIG. 3 shows the magnetic trigger 18 in the inactive state in the absence of network fault. The return force of the spring 36 is permanently greater than the magnetic attraction force in the air gap 40 due to the passage of the nominal current in the conductor 24. The movable magnetic armature 22 is in abutment against the legs 54 of the fixed stirrup 34, and the lever 64 is separated from the movable frame 22 by a predetermined distance. The trigger bar 14 remains immobilized in position armed by a bias spring (not shown), and the lever hooking 66 ensures the locking of the energy accumulator mechanism 16. The compression spring 36 extends substantially in a direction perpendicular to the horizontal branch 24a of the conductor 24, and the blade of the damper 58 is located in the meantime 56 in a non-deformed state, and placed against the magnetic frame mobile 22.

En cas d'apparition d'un courant de court-circuit dans le conducteur 24, l'attraction magnétique dans l'entrefer 40 l'emporte sur la force de rappel du ressort 36, et provoque le pivotement de l'armature mobile 22 dans le sens de la flèche F1 (figure 4). Le ressort 36 se comprime durant ce mouvement de pivotement, au cours duquel l'armature mobile 22 entraíne l'amortissement 58 à lame jusqu'à une position intermédiaire , où la lame vient en butée contre les deux flasques 50,52 de l'étrier 34. Cette position intermédiaire est atteinte au bout d'une première course de l'armature mobile 22, et l'amortisseur 58 reste dans un état inactif suite à l'absence de déformation de la lame.In the event of a short-circuit current appearing in the conductor 24, the attraction magnetic in the air gap 40 outweighs the return force of the spring 36, and causes the movable armature 22 to pivot in the direction of arrow F1 (figure 4). The spring 36 is compressed during this pivoting movement, during which the movable armature 22 causes the damping 58 to blade to a position intermediate, where the blade abuts against the two flanges 50, 52 of the stirrup 34. This intermediate position is reached after a first stroke of the armature mobile 22, and the shock absorber 58 remains in an inactive state following the absence of blade deformation.

Deux cas de fonctionnement sont alors possibles :

  • 1) en cas d'élimination du courant de court-circuit par un dispositif de protection contre les courts circuits situé en aval, l'amortisseur 58 à lame stoppe le mouvement poursuivi de l'armature mobile 22 dans le sens de la flèche F1, et le ressort 36 ramène l'armature mobile 22 vers la position écartée de repos illustrée à la figure 3. L'armature mobile 22 ne vient pas en engagement avec le levier d'actionnement 64 de la barre de déclenchement 14, laquelle reste immobile en position armée.
  • 2) Si le courant de court-circuit persiste, l'effort d'attraction magnétique dans l'entrefer 40 provoque le pivotement poursuivi de l'armature mobile 22 jusqu'à une position finale de butée contre les faces polaires de l'armature fixe 20 (figure 5). La lame de l'amortisseur 58 se déforme élastiquement durant cette deuxième course de l'armature 22 entre la position intermédiaire, et la position finale, et permet la rotation de la barre de déclenchement 14 dans le sens de la flèche F2 vers la position déclenchée. Le levier d'accrochage 66 libère le mécanisme accumulateur d'énergie 16 à percuteur d'ouverture du disjoncteur.
    • Two operating cases are then possible:
  • 1) in the event of elimination of the short-circuit current by a short-circuit protection device located downstream, the damper 58 with blade stops the continued movement of the movable armature 22 in the direction of the arrow F1, and the spring 36 brings the movable armature 22 back to the separated rest position illustrated in FIG. 3. The movable armature 22 does not come into engagement with the actuation lever 64 of the trigger bar 14, which remains stationary in armed position.
  • 2) If the short-circuit current persists, the magnetic attraction force in the air gap 40 causes the pivoting of the movable armature 22 to a final position of abutment against the polar faces of the fixed armature 20 (Figure 5). The blade of the shock absorber 58 elastically deforms during this second stroke of the armature 22 between the intermediate position and the final position, and allows the rotation of the trigger bar 14 in the direction of the arrow F2 towards the triggered position . The latching lever 66 releases the energy accumulator mechanism 16 with a breaker for opening the circuit breaker.

    • Dans le premier cas, l'amortisseur 58 à lame sert de frein empêchant le déplacement de l'armature mobile 22 au-delà de la position intermédiaire. Le déclenchement du disjoncteur aval maintient ainsi le disjoncteur amont fermé, le disjoncteur amont étant celui associé au déclenchement magnétique sélectif 18. Le déplacement de l'armature mobile 22 de la position de repos vers la position intermédiaire intervient dès que le courant dépasse un seuil correspondant au tarage du ressort 36.In the first case, the blade damper 58 acts as a brake preventing displacement of the movable armature 22 beyond the intermediate position. The triggering of downstream circuit breaker thus keeps the upstream circuit breaker closed, the upstream circuit breaker that associated with the selective magnetic trip 18. The displacement of the armature mobile 22 from the rest position to the intermediate position intervenes as soon as the current exceeds a threshold corresponding to the setting of spring 36.

    Dans le deuxième cas, la déformation de la lame de l'amortisseur 58 engendre une temporisation avant le déclenchement effectif du disjoncteur associé au déclencheur magnétique 18 sélectif. Cette temporisation par amortissement dépend de l'intensité et la durée du courant de court-circuit, et permet d'assurer une sélectivité totale de la protection.In the second case, the deformation of the blade of the shock absorber 58 generates a time delay before the effective trip of the circuit breaker associated with the trip unit magnetic 18 selective. This amortization delay depends on the intensity and the duration of the short-circuit current, and ensures total selectivity of the protection.

    Il est clair que la lame de l'amortisseur 58 des figures 2 à 8 peut être remplacée par des moyens d'amortissement équivalents. Sur les figures 9 et 10, un ressort de compression 70 est solidarisé à l'extrémité supérieure de l'armature magnétique mobile 22, de manière à venir en butée contre le conducteur 24 lorsque l'armature mobile 22 se trouve en position intermédiaire. Le déclenchement est possible lors de l'attraction de l'armature mobile 22 contre les faces polaires de l'armature fixe 20, et après compression du ressort 70.It is clear that the blade of the shock absorber 58 of FIGS. 2 to 8 can be replaced by equivalent depreciation means. In FIGS. 9 and 10, a spring of compression 70 is secured to the upper end of the magnetic frame movable 22, so as to abut against the conductor 24 when the armature mobile 22 is in the intermediate position. Triggering is possible during the attraction of the movable frame 22 against the pole faces of the fixed frame 20, and after compression of the spring 70.

    Dans la variante des figures 11 et 12, l'amortisseur est formé par un ressort de torsion 72 monté sur l'axe de pivotement 53 de l'armature magnétique mobile 22. Le ressort 72 reste inactif jusqu'à la position intermédiaire de l'armature mobile 22, et est ensuite bandé lors du déplacement poursuivi vers la position finale d'attraction.In the variant of FIGS. 11 and 12, the damper is formed by a spring of torsion 72 mounted on the pivot axis 53 of the movable magnetic armature 22. The spring 72 remains inactive up to the intermediate position of the movable armature 22, and is then bandaged during the continued movement to the final position of attraction.

    Claims (10)

    1. Tripping block (10) for a multipole electrical circuit breaker comprising a selective magnetic trip device (18) per pole, said tripping block comprising:
      a U-shaped fixed magnetic armature (20) located facing a movable magnetic armature (22) with interposition of an air gap (40),
      a conductor (24) associated to the fixed magnetic armature (20), through which conductor the current of the corresponding poles flows,
      an elastic part (36) biasing the movable magnetic armature (22) to a separated rest position corresponding to the maximum air gap (40),
      and time delay means cooperating with the movable magnetic armature (22) to perform chronometric protection selectivity,
      characterized in that the time delay means comprise a damping device (58,70,72) fitted on the movable magnetic armature (22) and designed to be in an inactive state up to an intermediate non-tripping position when the movable magnetic armature (22) is attracted by polar parts of the fixed magnetic armature (20) during a first travel, switching to the active state resulting from a deformation of the damping device during a second travel of the movable armature (22) between the intermediate position and the final attraction position causing tripping of the circuit breaker.
    2. Tripping block according to claim 1, characterized in that the movable magnetic armature (22) is mounted with pivoting on a bracket (34) fixed to the conductor (24), and that the damping device (58) comprises a metallic blade of small thickness arranged in a gap (56) between the movable armature (22) and said bracket (34).
    3. Tripping block according to claim 2, characterized in that the blade of the damping device (58) comprises a base clipped onto a protuberance (60) of the bracket (34) and an upper part cooperating with a drive part of the movable magnetic armature (22).
    4. Tripping block according to claim 3, characterized in that the drive part is formed by a band (62) provided at the rear of the movable armature (22) through which band said blade passes with clearance.
    5. Tripping block according to claim 3 or 4, characterized in that the base of the blade presents a width slightly greater than the transverse distance separating the flanges (50, 52) of the bracket (34), said flanges acting as stop for the blade when the movable magnetic armature (22) reaches the intermediate position during the first travel.
    6. Tripping block according to claim 2, characterized in that the fixed bracket (34) is equipped with lateral lugs (54) arranged to define the rest position of the movable magnetic armature (22) and said gap (56) for housing the blade.
    7. Tripping block according to any one of the claims 2 to 6, characterized in that the elastic return part of the movable armature (22) is formed by a compression spring (36) arranged on the side opposite the gap (56) between the base (32) of the bracket (34) and an edge (38) of the movable armature (22).
    8. Tripping block according to claim 7, characterized in that the bracket (34), the blade of the damping device (58), the movable magnetic armature (22), and the compression spring (36) constitute a pre-assembled sub-assembly fixed by a screw (30) onto the conductor (24) to form the selective magnetic trip device (18).
    9. Tripping block according to claim 1, characterized in that the damping device comprises a compression spring (70) securedly affixed to the movable magnetic armature (22) and coming into engagement with the conductor (24) at the end of the first travel of the armature (22).
    10. Tripping block according to claim 1, characterized in that the damping device comprises a torsion spring (72) mounted on the pivoting spindle (53) of the movable magnetic armature (22).
    EP97410137A 1996-12-13 1997-12-04 Selective tripping block for multipole circuit breaker Expired - Lifetime EP0848404B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9615607A FR2757309B1 (en) 1996-12-13 1996-12-13 SELECTIVE TRIP BLOCK FOR A MULTIPOLAR CIRCUIT BREAKER
    FR9615607 1996-12-13

    Publications (2)

    Publication Number Publication Date
    EP0848404A1 EP0848404A1 (en) 1998-06-17
    EP0848404B1 true EP0848404B1 (en) 2004-09-22

    Family

    ID=9498832

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97410137A Expired - Lifetime EP0848404B1 (en) 1996-12-13 1997-12-04 Selective tripping block for multipole circuit breaker

    Country Status (6)

    Country Link
    US (1) US5831499A (en)
    EP (1) EP0848404B1 (en)
    CN (1) CN1174453C (en)
    DE (1) DE69730806T2 (en)
    ES (1) ES2227659T3 (en)
    FR (1) FR2757309B1 (en)

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    US20090115556A1 (en) * 2007-11-05 2009-05-07 Square D Company Divided adjustable armature for a circuit breaker
    DE102009007586A1 (en) * 2009-02-05 2010-08-19 Saia-Burgess Dresden Gmbh Tripping device, in particular for circuit breakers
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    CN105393322B (en) * 2013-07-19 2017-07-04 通用电气公司 Electrical switchgear including adjustable damper assembly
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    Also Published As

    Publication number Publication date
    DE69730806T2 (en) 2005-11-17
    DE69730806D1 (en) 2004-10-28
    FR2757309A1 (en) 1998-06-19
    CN1185014A (en) 1998-06-17
    CN1174453C (en) 2004-11-03
    ES2227659T3 (en) 2005-04-01
    US5831499A (en) 1998-11-03
    FR2757309B1 (en) 1999-01-29
    EP0848404A1 (en) 1998-06-17

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