EP0620580B1 - Auxiliary trip device for circuit breaker - Google Patents

Auxiliary trip device for circuit breaker Download PDF

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Publication number
EP0620580B1
EP0620580B1 EP94410022A EP94410022A EP0620580B1 EP 0620580 B1 EP0620580 B1 EP 0620580B1 EP 94410022 A EP94410022 A EP 94410022A EP 94410022 A EP94410022 A EP 94410022A EP 0620580 B1 EP0620580 B1 EP 0620580B1
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EP
European Patent Office
Prior art keywords
auxiliary
push
fixed core
spring
rod
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
EP94410022A
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German (de)
French (fr)
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EP0620580A1 (en
Inventor
Patrick Coudert
Jean-Pierre Nereau
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Schneider Electric SE
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Schneider Electric SE
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Publication of EP0620580A1 publication Critical patent/EP0620580A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H2083/205—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition having shunt or UVR tripping device with integrated mechanical energy accumulator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H2083/208—Converting under voltage release [UVR] and shunt release

Definitions

  • the present invention relates generally to auxiliary trip units intended to be associated with circuit breakers, in particular molded case circuit breakers.
  • a conventional molded case circuit breaker generally comprises, inside a molded case, a circuit breaker control mechanism, a trip bar that can be moved so as to break the latching of the circuit breaker control mechanism and at least one main trigger intended to control a movement of the trigger bar. If the circuit breaker is multipolar, a number of main trip units can be provided, this number being equal to the number of poles of the circuit breaker.
  • any of the main trip devices of the circuit breaker detects an electrical condition which is greater than a predetermined threshold, for example if it detects an intensity of current flowing in the corresponding pole greater than a predetermined value, this main trip device starts operating to control a movement of the trip bar, this movement of the trip bar causing the breakage of the latching of the circuit breaker control mechanism, and this circuit breaker control mechanism thus causing the simultaneous interruption of the various current channels which correspond to the different poles of the multipole circuit breaker.
  • auxiliary trip device which is intended to be able to also cause the breakage of the latching of the circuit breaker control mechanism , and this independently of the operation of the main trigger or the main trip units included in the circuit breaker.
  • auxiliary trip device of a first type which permanently detects the presence or absence of a voltage at the circuit breaker and which is intended to cause the circuit breaker to trip when this voltage disappears or becomes below a predetermined threshold.
  • Such an auxiliary trigger of this first type which is a conventional auxiliary trigger, is commonly called "auxiliary trigger of the type triggered by lack of voltage".
  • auxiliary trip device of a second type which is intended to cause the circuit breaker to trip when an electric current greater than a predetermined level flows inside the auxiliary trip device.
  • auxiliary trigger of the second type which is a conventional auxiliary trigger, is commonly called "auxiliary trigger with release by current emission”.
  • circuit breakers have already been produced or proposed including or receiving auxiliary trip units which can either be auxiliary trip devices of the undervoltage type, or trip trip type auxiliary trip devices. It has also already been proposed to design an auxiliary trip device which can constitute either an auxiliary trip device of the undervoltage type, or an auxiliary trip device of the trip emission type.
  • Such an auxiliary trigger generally comprises a certain number of parts which are common to the two types of auxiliary triggers which it is desired to constitute.
  • other parts of the auxiliary trigger are specific to the auxiliary trigger of the undervoltage type and still other different parts are specific to the auxiliary trigger of the type triggered by current emission.
  • certain parts which are common to these two types of auxiliary releases must be mounted differently for the two types of auxiliary releases. The fact that a large number of parts are different between these two types of auxiliary trip units is a drawback because this involves a relatively high manufacturing cost and a relatively high mounting cost.
  • An object of the present invention is to provide an auxiliary trip unit for a molded case circuit breaker, this auxiliary trip unit which can constitute either an auxiliary trip device of the undervoltage type or an auxiliary trip device of the trip emission type, while almost all of the parts which constitute such an auxiliary trigger are identical for the two types of auxiliary triggers which can thus be arranged.
  • Another object of the present invention consists in proposing such an auxiliary trigger in which the trigger threshold of the auxiliary trigger is both precise and adjustable, this threshold possibly being different when the auxiliary trigger is of the first type or of the second type and this threshold adjustment which can be carried out independently when the auxiliary release is of the first type or of the second type.
  • an auxiliary trip device according to the present invention is indicated generally by the reference 1.
  • the auxiliary trip device 1 according to the invention is intended to come to couple with or come to be housed in a circuit breaker with a conventional molded case (not shown).
  • the auxiliary trigger 1 generally comprises a trigger housing 2 which is intended to support in a fixed or mobile manner most of the parts which together constitute the device.
  • An energy storage system generally consists of a pallet 4 which is pivotally mounted on the housing 2 at two joints 6 disposed on either side of the housing 2 and a spring 8 which is intended to accumulate energy to operate the paddle. In the example shown in Figure 1, there are in fact two springs 8 which are mounted in parallel and which act jointly.
  • the auxiliary trip device 1 comprises an electromechanical actuating device which includes a coil 10 which surrounds other parts of the device (not shown in FIG. 1 and which will be described in more detail in the following text).
  • the auxiliary trip device also comprises a terminal block 12 supporting two electrical terminals 14, 16 which are electrically connected to the coil 10 and which are intended to be connected to external electric wires (not shown). Most of the internal parts of the auxiliary release 1 are not visible in FIG. 1 and will be described below.
  • FIG. 2 shows in longitudinal section the auxiliary release of Figure 1 when it is mounted in a particular way to form an auxiliary release of the undervoltage type.
  • the auxiliary trigger 1 is shown in more detail.
  • the electromechanical actuation device mainly includes the coil 10 which surrounds a sheath 18 comprising a central hole 20 which passes right through it longitudinally, and in this sheath are arranged a fixed core 22, a movable core 24 defining with the fixed core an air gap 26, a pusher 28 rigidly connected to the movable core 24 and a first spring 30.
  • the pusher 28 is in the form of an elongated rod which is threaded through a central hole in the movable core 24 and which is fixed to the movable core by screwing.
  • a first end 32 of the pusher 28 protrudes slightly from the movable core 24 and the other opposite end 34 of the pusher 28 is relatively distant from the movable core 24, that is to say that a significant part of the pusher 28 extends ( to the right in FIG. 2) over a long distance outside the movable core 24 while another opposite part 32 extends for a short distance outside the movable core 24.
  • a compression spring 30 is arranged so as to surround the pusher 28 while the fixed core is disposed around this same part of pusher 28.
  • the fixed core 22 includes a longitudinal hole which passes through it so as to thus pass through the pusher 28 and so as to constitute, in a part of the fixed core 22, a housing 36 for the compression spring 30.
  • the fixed core 22 further includes at its central hole, a threaded portion 38 in which is fixed a stop piece 40 which can be adjusted axially by screwing it more or less into the threaded part 38.
  • the compression spring 30 bears on one side against an end face of the movable core 24, this face also constituting the air gap 26, and rests on the other side against an end face of the part abutment 40. It follows from this that the compression force of the spring 30 tends to separate the movable core 24 from the fixed core 22 and to cause the air gap 26 to take a maximum dimension.
  • the central hole 20 of the sleeve 18 comprises a first bore 42 which opens on a first end 44 of the sleeve, a second bore 46 which opens at a second opposite end 48 of the sleeve and a middle part 50 which has a smaller diameter that the diameter of the first bore 42 and that the diameter of the second bore 46, the diameters of the bores 42 and 46 being preferably equal.
  • This energy storage system comprises the pallet 4 which is pivotally mounted around the axis 6 and the second spring 8 which is used to accumulate energy in order to suddenly activate the pallet 4.
  • the second spring 8 has one end fixed to a fixed anchor piece 51 and its other end is fixed to an anchor part 52 of the pallet 4.
  • the pallet 4 comprises a hooking end 54 which is distant from the articulation 6.
  • This system energy storage further comprises the latch 55 which is pivotally mounted around the axis 56 and which is continuously pushed (counterclockwise in Figure 2) using 'a spring 57 which is wound around the hinge pin 6 and which is moored to the housing of the device by means of one of these branches 58 which come to bear permanently against a part of the anchoring part 51.
  • the latch 55 comprises a hooking part 60 which comes to cooperate with the hooking part 54 of the pallet 4, when this pallet 4 is in the armed position for which it is moved by pivoting (clockwise in FIG. 2) in the direction which strips the second spring 8.
  • the pallet 4 is intended to control a movement of a trigger bar (not shown) which is conventionally included in a conventional circuit breaker and which is itself intended to cause, in a conventional manner, the breaking of the attachment of a circuit breaker control mechanism itself included in a conventional circuit breaker.
  • the lock 55 is, in the armed position, hooked to the pallet 4 and is movable (by pivoting clockwise in FIG. 2) against the spring 57 in order to release its attachment to the pallet 4 so as to allow the pallet 4, due to the relaxation of the second spring 8, to move suddenly by pivoting in order to cause the displacement of the trip bar (not shown) of the circuit breaker (not shown).
  • the displacement of the latch 55 in the direction which causes it to disengage from the pallet 4 is obtained by an appropriate displacement of the pusher 28.
  • the end 32 of the pusher 28 constitutes an actuating part 32 of the pusher 28 and it is located opposite and at a short distance from an actuating part 62 of the latch 55.
  • the auxiliary trip device 1 When the auxiliary trip device 1 is armed, that is to say when it is in the position shown in the figure 2, the latch 55 is hooked to the pallet 4 and the latch 55 is in a pivoted position (anti-clockwise) so that its actuating part 62 is located a short distance from the part actuation 32 of the pusher 28. This small distance is hereinafter called "guard".
  • the pusher 28 in this armed position, the pusher 28 is in a rest position as shown in FIG. 2, and this rest position corresponds in fact to a position of the pusher 28 in which it is completely pushed (to the right) the fact that the coil 10 is constantly supplied with electric current and that this has the consequence that the movable core 24 is attracted against the fixed core 22 (that is to say that the air gap 26 is made minimum). If at any time, the current flowing in the coil 10 becomes below a predetermined threshold, that is to say if the voltage across said coil 10 becomes zero or less than a predetermined threshold, the force of compression of the first spring 30 becomes greater than the force of attraction of the movable core 24 towards the fixed core 22, and the pusher 28 then moves to the left in FIG.
  • a predetermined threshold that is to say if the voltage across said coil 10 becomes zero or less than a predetermined threshold
  • An essential characteristic of the invention resides in the fact that the second spring 8 can accumulate and release, during its movements during the operation of the auxiliary trip device 1, a mechanical energy greater than the mechanical energy which can be accumulated and released by the first spring 30 during its movements during the operation of the electromagnetic actuation device of this same auxiliary trip device 1.
  • Another characteristic of the present invention resides in the fact that the "guard” is provided between the actuating part 32 of the pusher 28 and the part corresponding actuation 62 of the latch 55, when the latch is attached to the pallet 4 and when the pusher 28 is normally stressed due to the normal excitation of the coil 10.
  • the auxiliary trigger of FIG. 2 which constitutes a trigger of the type of triggering by lack of voltage, can function correctly while the coil 10 is supplied with electric current under a very low electric power (for example low voltage and / or a weak current).
  • the coil 10 is used to create an electromechanical force which is just sufficient to overcome the compression force of the first spring 30.
  • This first spring 30 can have a very low compression force.
  • the compression force of the spring 30 must however be sufficient to be able to actuate the latch 55 so that the latter releases the pallet 4.
  • FIG. 4 represents a diagram showing the variations of the force of attraction of the movable core 24 towards the fixed core 22 as well as the variations of the pushing force of the pusher 28 against the actuating part 62 of the latch 55, this as a function from the position taken by the pusher 28.
  • position 0 corresponds to the position of the pusher 28 when the movable core 24 is completely attracted to the fixed core 22. It can be seen that as long as the voltage across the terminals of the coil 10 is greater than a predetermined threshold, the force of attraction of the movable core towards the fixed core for the minimum air gap is greater than the pushing force of the spring 30.
  • the point A of the graph corresponds to the tension threshold for which the attraction force is equal to the pushing force of the spring 30.
  • auxiliary trigger 1 which has already been described in relation to FIGS. 1 and 2 but which is mounted differently so as to constitute an auxiliary trigger of the type triggered by the emission of current.
  • the auxiliary trigger 1 of the type with triggering by emission of current as shown in FIG. 3 operates "backwards" from the trigger of FIG. 2 in the direction in which the auxiliary trigger of FIG. 3 is triggered, that is to say that is, unlocks the latch 55 when an electric current passing through the coil 10 becomes greater than a predetermined threshold.
  • the device can be improved by providing a bearing 64 (see both Figure 2 and Figure 3) which surrounds the movable core 24 and which is housed in the bore 42 or 46 of the sleeve 18.
  • This part 64 serves to support and guide the movable core 24 during its longitudinal displacement.
  • the mobile core 24 must have an external diameter smaller than the internal diameter of the narrowed part 50 in order to be able to be mounted, and it cannot therefore be directly guided by the bore 42 or 46.

Description

La présente invention concerne de façon générale des déclencheurs auxiliaires destinés à être associés à des disjoncteurs, notamment des disjoncteurs à boîtier moulé.The present invention relates generally to auxiliary trip units intended to be associated with circuit breakers, in particular molded case circuit breakers.

Un disjoncteur à boîtier moulé classique comprend de façon générale, à l'intérieur d'un boîtier moulé, un mécanisme de commande de disjoncteur, une barre de déclenchement déplaçable de façon à provoquer la rupture de l'accrochage du mécanisme de commande de disjoncteur et au moins un déclencheur principal destiné à commander un déplacement de la barre de déclenchement. Si le disjoncteur est multipolaire, il peut être prévu un certain nombre de déclencheurs principaux, ce nombre étant égal au nombre de pôles du disjoncteur. Dans ce cas, si l'un quelconque des déclencheurs principaux du disjoncteur détecte une condition électrique qui est supérieure à un seuil prédéterminé, par exemple s'il détecte une intensité de courant circulant dans le pôle correspondant supérieur à une valeur prédéterminée, ce déclencheur principal se met en fonctionnement pour commander un déplacement de la barre de déclenchement, ce déplacement de la barre de déclenchement provoquant la rupture de l'accrochage du mécanisme de commande de disjoncteur, et ce mécanisme de commande de disjoncteur provoquant ainsi l'interruption simultanée des différentes voies de courant qui correspondent aux différents pôles du disjoncteur multipolaire.A conventional molded case circuit breaker generally comprises, inside a molded case, a circuit breaker control mechanism, a trip bar that can be moved so as to break the latching of the circuit breaker control mechanism and at least one main trigger intended to control a movement of the trigger bar. If the circuit breaker is multipolar, a number of main trip units can be provided, this number being equal to the number of poles of the circuit breaker. In this case, if any of the main trip devices of the circuit breaker detects an electrical condition which is greater than a predetermined threshold, for example if it detects an intensity of current flowing in the corresponding pole greater than a predetermined value, this main trip device starts operating to control a movement of the trip bar, this movement of the trip bar causing the breakage of the latching of the circuit breaker control mechanism, and this circuit breaker control mechanism thus causing the simultaneous interruption of the various current channels which correspond to the different poles of the multipole circuit breaker.

Dans un tel disjoncteur à boîtier moulé classique, que celui-ci soit monopolaire ou multipolaire, il peut être souhaitable d'associer au disjoncteur un déclencheur auxiliaire qui est destiné à pouvoir provoquer lui aussi la rupture de l'accrochage du mécanisme de commande de disjoncteur, et cela d'une façon indépendante du fonctionnement du déclencheur principal ou des déclencheurs principaux inclus dans le disjoncteur. Par exemple, il peut être souhaitable d'associer ou de combiner au disjoncteur un déclencheur auxiliaire d'un premier type qui détecte en permanence la présence ou l'absence d'une tension au niveau du disjoncteur et qui est destiné à faire disjoncter le disjoncteur lorsque cette tension disparaît ou devient inférieure à un seuil prédéterminé. Un tel déclencheur auxiliaire de ce premier type, qui est un déclencheur auxiliaire classique, est communément appelé "déclencheur auxiliaire du type à déclenchement par manque de tension".In such a conventional molded case circuit breaker, whether it is monopolar or multipolar, it may be desirable to associate with the circuit breaker an auxiliary trip device which is intended to be able to also cause the breakage of the latching of the circuit breaker control mechanism , and this independently of the operation of the main trigger or the main trip units included in the circuit breaker. For example, it may be desirable to associate or combine with the circuit breaker an auxiliary trip device of a first type which permanently detects the presence or absence of a voltage at the circuit breaker and which is intended to cause the circuit breaker to trip when this voltage disappears or becomes below a predetermined threshold. Such an auxiliary trigger of this first type, which is a conventional auxiliary trigger, is commonly called "auxiliary trigger of the type triggered by lack of voltage".

On peut utiliser aussi un déclencheur auxiliaire d'un second type qui est destiné à faire disjoncter le disjoncteur lorsqu'un courant électrique supérieur à un niveau prédéterminé circule à l'intérieur du déclencheur auxiliaire. Un tel déclencheur auxiliaire du second type, qui est un déclencheur auxiliaire classique, est communément appelé "déclencheur auxiliaire à déclenchement par émission de courant".It is also possible to use an auxiliary trip device of a second type which is intended to cause the circuit breaker to trip when an electric current greater than a predetermined level flows inside the auxiliary trip device. Such an auxiliary trigger of the second type, which is a conventional auxiliary trigger, is commonly called "auxiliary trigger with release by current emission".

Par conséquent, il a été déjà réalisé ou proposé des disjoncteurs incluant ou recevant des déclencheurs auxiliaires pouvant être indifféremment soit des déclencheurs auxiliaires du type à manque de tension, soit des déclencheurs auxiliaires du type à déclenchement par émission de courant. Il a aussi déjà été proposé de concevoir un déclencheur auxiliaire pouvant constituer soit un déclencheur auxiliaire du type à manque de tension, soit un déclencheur auxiliaire du type à déclenchement par émission de courant. Un tel déclencheur auxiliaire comprend en général un certain nombre de pièces qui sont communes aux deux types de déclencheurs auxiliaires que l'on souhaite constituer. Par contre, d'autres pièces du déclencheur auxiliaire sont spécifiques du déclencheur auxiliaire du type à manque de tension et encore d'autres pièces différentes sont spécifiques du déclencheur auxiliaire du type à déclenchement par émission de courant. Par ailleurs, certaines pièces qui sont communes à ces deux types de déclencheurs auxiliaires doivent être montées différemment pour les deux types de déclencheurs auxiliaires. Le fait qu'un grand nombre de pièces soient différentes entre ces deux types de déclencheurs auxiliaires constitue un inconvénient parce que ceci entraîne un coût de fabrication relativement élevé et un coût de montage lui aussi relativement élevé.Consequently, circuit breakers have already been produced or proposed including or receiving auxiliary trip units which can either be auxiliary trip devices of the undervoltage type, or trip trip type auxiliary trip devices. It has also already been proposed to design an auxiliary trip device which can constitute either an auxiliary trip device of the undervoltage type, or an auxiliary trip device of the trip emission type. Such an auxiliary trigger generally comprises a certain number of parts which are common to the two types of auxiliary triggers which it is desired to constitute. On the other hand, other parts of the auxiliary trigger are specific to the auxiliary trigger of the undervoltage type and still other different parts are specific to the auxiliary trigger of the type triggered by current emission. In addition, certain parts which are common to these two types of auxiliary releases must be mounted differently for the two types of auxiliary releases. The fact that a large number of parts are different between these two types of auxiliary trip units is a drawback because this involves a relatively high manufacturing cost and a relatively high mounting cost.

Un objet de la présente invention consiste à proposer un déclencheur auxiliaire pour disjoncteur à boîtier moulé, ce déclencheur auxiliaire pouvant constituer soit un déclencheur auxiliaire du type à manque de tension soit un déclencheur auxiliaire du type à déclenchement par émission de courant, tandis que la quasi totalité des pièces qui constituent un tel déclencheur auxiliaire sont identiques pour les deux types de déclencheurs auxiliaires que l'on peut ainsi agencer.An object of the present invention is to provide an auxiliary trip unit for a molded case circuit breaker, this auxiliary trip unit which can constitute either an auxiliary trip device of the undervoltage type or an auxiliary trip device of the trip emission type, while almost all of the parts which constitute such an auxiliary trigger are identical for the two types of auxiliary triggers which can thus be arranged.

Un autre objet de la présente invention consiste à proposer un tel déclencheur auxiliaire dans lequel le seuil de déclenchement du déclencheur auxiliaire est à la fois précis et réglable, ce seuil pouvant être différent lorsque le déclencheur auxiliaire est du premier type ou du second type et ce réglage du seuil pouvant être effectué de façon indépendante lorsque le déclencheur auxiliaire est du premier type ou du second type.Another object of the present invention consists in proposing such an auxiliary trigger in which the trigger threshold of the auxiliary trigger is both precise and adjustable, this threshold possibly being different when the auxiliary trigger is of the first type or of the second type and this threshold adjustment which can be carried out independently when the auxiliary release is of the first type or of the second type.

L'invention concerne donc plus précisément un déclencheur auxiliaire pour disjoncteur à boîtier moulé,

  • ledit disjoncteur comprenant : un mécanisme de commande de disjoncteur ; une barre de déclenchement déplaçable de façon à provoquer une rupture de l'accrochage du mécanisme de commande de disjoncteur ; et au moins un déclencheur principal destiné à commander un déplacement de la barre de déclenchement,
  • ledit déclencheur auxiliaire comprenant, dans un boîtier de déclencheur : un dispositif d'actionnement électromécanique incluant une bobine entourant un fourreau, dans le fourreau, un noyau fixe, un noyau mobile définissant avec le noyau fixe un entrefer, un poussoir lié au noyau mobile et un premier ressort poussant en permanence le poussoir dans le sens de l'augmentation de dimension de l'entrefer ; et un système à accumulation d'énergie incluant une palette destinée à commander un déplacement de ladite barre de déclenchement, un second ressort accumulant de l'énergie pour actionner la palette et un verrou accroché à la palette et déplaçable pour libérer son accrochage à la palette.
The invention therefore relates more specifically to an auxiliary trip device for molded case circuit breaker,
  • said circuit breaker comprising: a circuit breaker control mechanism; a trip bar movable so as to cause a break in the latching of the circuit breaker control mechanism; and at least one main trigger intended to control a movement of the trigger bar,
  • said auxiliary trip unit comprising, in a trip unit: an electromechanical actuation device including a coil surrounding a sheath, in the sheath, a fixed core, a movable core defining with the fixed core an air gap, a pusher linked to the movable core and a first spring permanently pushing the pusher in the direction of increasing the size of the air gap; and an energy storage system including a pallet intended to control a displacement of said trigger bar, a second spring accumulating energy to actuate the pallet and a lock attached to the pallet and movable to release its attachment to the pallet .

Selon une caractéristique essentielle de la présente invention,

  • ledit second ressort accumule et libère, lors de ses déplacements au cours du fonctionnement dudit déclencheur auxiliaire, une énergie supérieure à l'énergie accumulée et libérée par ledit premier ressort lors de ses déplacements au cours du fonctionnement dudit dispositif d'actionnement électromécanique ; et
  • une partie d'actionnement du poussoir peut venir pousser sur une partie d'actionnement du verrou de telle sorte qu'un déplacement du verrou dans le sens de la libération de son accrochage à la palette soit provoqué par un déplacement du poussoir dans un sens déterminé, une garde étant prévue entre ladite partie d'actionnement du poussoir et ladite partie d'actionnement du verrou lorsque le poussoir n'est pas déplacé dans ledit sens déterminé.
According to an essential characteristic of the present invention,
  • said second spring accumulates and releases, during its movements during the operation of said auxiliary trip device, an energy greater than the energy accumulated and released by said first spring during its movements during operation of said electromechanical actuation device; and
  • an actuating part of the pusher can come to push on an actuating part of the latch so that a displacement of the latch in the direction of the release of its attachment to the pallet is caused by a displacement of the pusher in a determined direction , a guard being provided between said actuating part of the pusher and said actuating part of the latch when the pusher is not moved in said determined direction.

Selon un mode de réalisation particulier de l'invention,

  • le poussoir est fixé au noyau mobile et s'étend de façon coulissante au travers du noyau fixe ;
  • le premier ressort entoure le poussoir et exerce une poussée au niveau de ses deux extrémités respectivement sur le noyau fixe et sur le noyau mobile, dans le sens de leur éloignement l'un de l'autre ;
  • le diamètre externe du noyau fixe est supérieur au diamètre externe du noyau mobile ; et
  • le fourreau présente un trou central qui le traverse longitudinalement et qui comprend un premier alésage débouchant sur une première extrémité, un second alésage de sensiblement le même diamètre et débouchant sur une seconde extrémité opposée et une partie médiane d'un diamètre plus faible que celui desdits premier et second alésages ;
  • d'où il résulte que l'ensemble formé par le noyau fixe, le noyau mobile, le poussoir et le premier ressort peut être monté à l'intérieur du trou du fourreau des deux manières suivantes : soit en logeant fixement le noyau fixe dans le premier alésage de façon à constituer un déclencheur auxiliaire du type à déclenchement par manque de tension, soit en logeant fixement le noyau fixe dans le second alésage de façon à constituer un déclencheur auxiliaire du type à déclenchement par émission de courant.
According to a particular embodiment of the invention,
  • the pusher is fixed to the movable core and extends slidingly through the fixed core;
  • the first spring surrounds the pusher and exerts a thrust at its two ends respectively on the fixed core and on the movable core, in the direction of their separation from one another;
  • the outer diameter of the fixed core is greater than the outer diameter of the movable core; and
  • the sheath has a central hole which crosses it longitudinally and which comprises a first bore opening on a first end, a second bore of substantially the same diameter and opening on a second opposite end and a median part of a diameter smaller than that of said first and second bores;
  • where it follows that the assembly formed by the fixed core, the movable core, the pusher and the first spring can be mounted inside the sleeve hole in the following two ways: either by fixedly housing the fixed core in the first bore so as to constitute an auxiliary trigger of the type triggered by lack of voltage, or by fixedly housing the fixed core in the second bore so as to constitute an auxiliary trigger of the type triggered by current emission.

Ces objets, caractéristiques et avantages, ainsi que d'autres de la présente invention seront mieux compris lors de la description détaillée d'un exemple de réalisation qui va suivre, illustrée par les figures annexées parmi lesquelles :

  • la figure 1 est une vue générale en perspective d'un déclencheur auxiliaire selon la présente invention ;
  • la figure 2 est une vue en coupe longitudinale du déclencheur auxiliaire de la figure 1, lorsque celui-ci est monté de façon à constituer un déclencheur auxiliaire du type à manque de tension ;
  • la figure 3 est une vue en coupe longitudinale du déclencheur auxiliaire de la figure 1 lorsque celui-ci est monté de façon à constituer un déclencheur auxiliaire du type à déclenchement par émission de courant ; et
  • la figure 4 est un diagramme qui représente l'évolution des diverses forces mises en jeu dans le déclencheur auxiliaire de la figure 2, lors du fonctionnement de celui-ci.
These objects, characteristics and advantages, as well as others of the present invention will be better understood during the detailed description of an exemplary embodiment which will follow, illustrated by the appended figures among which:
  • Figure 1 is a general perspective view of an auxiliary trip device according to the present invention;
  • Figure 2 is a longitudinal sectional view of the auxiliary release of Figure 1, when it is mounted so as to constitute an auxiliary release of the undervoltage type;
  • Figure 3 is a longitudinal sectional view of the auxiliary release of Figure 1 when it is mounted so as to constitute an auxiliary release of the type with release by current emission; and
  • FIG. 4 is a diagram which represents the evolution of the various forces brought into play in the auxiliary trigger of FIG. 2, during the operation of the latter.

Sur la figure 1, un déclencheur auxiliaire selon la présente invention est indiqué de façon générale par le repère 1. Le déclencheur auxiliaire 1 selon l'invention est destiné à venir s'accoupler à ou venir se loger dans un disjoncteur à boîtier moulé classique (non représenté). Le déclencheur auxiliaire 1 comprend de façon générale un boîtier de déclencheur 2 qui est destiné à supporter de façon fixe ou mobile la plupart des pièces qui constituent ensemble l'appareil. Un système à accumulation d'énergie est constitué de façon générale par une palette 4 qui est montée de façon pivotante sur le boîtier 2 au niveau de deux articulations 6 disposées de part et d'autre du boîtier 2 et un ressort 8 qui est destiné à accumuler l'énergie pour actionner la palette. Dans l'exemple représenté sur la figure 1, il est prévu en fait deux ressorts 8 qui sont montés en parallèle et qui agissent conjointement.In FIG. 1, an auxiliary trip device according to the present invention is indicated generally by the reference 1. The auxiliary trip device 1 according to the invention is intended to come to couple with or come to be housed in a circuit breaker with a conventional molded case ( not shown). The auxiliary trigger 1 generally comprises a trigger housing 2 which is intended to support in a fixed or mobile manner most of the parts which together constitute the device. An energy storage system generally consists of a pallet 4 which is pivotally mounted on the housing 2 at two joints 6 disposed on either side of the housing 2 and a spring 8 which is intended to accumulate energy to operate the paddle. In the example shown in Figure 1, there are in fact two springs 8 which are mounted in parallel and which act jointly.

Le déclencheur auxiliaire 1 comprend un dispositif d'actionnement électromécanique qui inclut une bobine 10 qui entoure d'autres pièces du dispositif (non représentées sur la figure 1 et qui seront décrites plus en détails dans la suite du texte). Le déclencheur auxiliaire comprend aussi un bornier 12 supportant deux bornes électriques 14, 16 qui sont connectées électriquement à la bobine 10 et qui sont destinées à être connectées à des fils électriques externes (non représentés). La plupart des pièces internes du déclencheur auxiliaire 1 ne sont pas visibles sur la figure 1 et seront décrites par ci-après.The auxiliary trip device 1 comprises an electromechanical actuating device which includes a coil 10 which surrounds other parts of the device (not shown in FIG. 1 and which will be described in more detail in the following text). The auxiliary trip device also comprises a terminal block 12 supporting two electrical terminals 14, 16 which are electrically connected to the coil 10 and which are intended to be connected to external electric wires (not shown). Most of the internal parts of the auxiliary release 1 are not visible in FIG. 1 and will be described below.

La figure 2 représente en coupe longitudinale le déclencheur auxiliaire de la figure 1 lorsque celui-ci est monté d'une façon particulière afin de constituer un déclencheur auxiliaire du type à manque de tension. Sur la figure 2, le déclencheur auxiliaire 1 est représenté plus en détail. Le dispositif d'actionnement électromécanique inclut principalement la bobine 10 qui entoure un fourreau 18 comprenant un trou central 20 qui le traverse de part en part longitudinalement, et dans ce fourreau sont agencés un noyau fixe 22, un noyau mobile 24 définissant avec le noyau fixe un entrefer 26, un poussoir 28 lié rigidement au noyau mobile 24 et un premier ressort 30. Le poussoir 28 se présente sous la forme d'une tige allongée qui est enfilée au travers d'un trou central du noyau mobile 24 et qui est fixée au noyau mobile par vissage. Une première extrémité 32 du poussoir 28 dépasse légèrement du noyau mobile 24 et l'autre extrémité opposée 34 du poussoir 28 est relativement éloignée du noyau mobile 24, c'est-à-dire qu'une partie significative du poussoir 28 s'étend (vers la droite sur la figure 2) sur une longue distance à l'extérieur du noyau mobile 24 tandis qu'une autre partie opposée 32 s'étend sur une courte distance à l'extérieur du noyau mobile 24. Au niveau de la partie du poussoir 28 qui s'étend sur une longue distance à l'extérieur du noyau mobile 24 du côté de l'extrémité 34, un ressort de compression 30 est disposé de façon à entourer le poussoir 28 tandis que le noyau fixe est disposé autour de cette même partie du poussoir 28.Figure 2 shows in longitudinal section the auxiliary release of Figure 1 when it is mounted in a particular way to form an auxiliary release of the undervoltage type. In Figure 2, the auxiliary trigger 1 is shown in more detail. The electromechanical actuation device mainly includes the coil 10 which surrounds a sheath 18 comprising a central hole 20 which passes right through it longitudinally, and in this sheath are arranged a fixed core 22, a movable core 24 defining with the fixed core an air gap 26, a pusher 28 rigidly connected to the movable core 24 and a first spring 30. The pusher 28 is in the form of an elongated rod which is threaded through a central hole in the movable core 24 and which is fixed to the movable core by screwing. A first end 32 of the pusher 28 protrudes slightly from the movable core 24 and the other opposite end 34 of the pusher 28 is relatively distant from the movable core 24, that is to say that a significant part of the pusher 28 extends ( to the right in FIG. 2) over a long distance outside the movable core 24 while another opposite part 32 extends for a short distance outside the movable core 24. At the level of the part of the pusher 28 which extends over a long distance outside the movable core 24 on the end side 34, a compression spring 30 is arranged so as to surround the pusher 28 while the fixed core is disposed around this same part of pusher 28.

Le noyau fixe 22 comprend un trou longitudinal qui le traverse de façon à laisser passer ainsi au travers le poussoir 28 et de façon à constituer, dans une partie du noyau fixe 22, un logement 36 pour le ressort de compression 30. Le noyau fixe 22 comprend en outre au niveau de son trou central, une partie taraudée 38 dans laquelle vient se fixer une pièce de butée 40 qui peut être réglée axialement en la vissant plus ou moins dans la partie taraudée 38.The fixed core 22 includes a longitudinal hole which passes through it so as to thus pass through the pusher 28 and so as to constitute, in a part of the fixed core 22, a housing 36 for the compression spring 30. The fixed core 22 further includes at its central hole, a threaded portion 38 in which is fixed a stop piece 40 which can be adjusted axially by screwing it more or less into the threaded part 38.

Le ressort de compression 30 s'appuie d'un côté contre une face d'extrémité du noyau mobile 24, cette face constituant aussi l'entrefer 26, et s'appuie de l'autre côté contre une face d'extrémité de la pièce de butée 40. Il résulte de cela que la force de compression du ressort 30 tend à écarter le noyau mobile 24 du noyau fixe 22 et à faire en sorte que l'entrefer 26 prenne une dimension maximale.The compression spring 30 bears on one side against an end face of the movable core 24, this face also constituting the air gap 26, and rests on the other side against an end face of the part abutment 40. It follows from this that the compression force of the spring 30 tends to separate the movable core 24 from the fixed core 22 and to cause the air gap 26 to take a maximum dimension.

Le trou central 20 du fourreau 18 comprend un premier alésage 42 qui débouche sur une première extrémité 44 du fourreau, un second alésage 46 qui débouche au niveau d'une seconde extrémité opposée 48 du fourreau et une partie médiane 50 qui présente un diamètre plus faible que le diamètre du premier alésage 42 et que le diamètre du second alésage 46, les diamètres des alésages 42 et 46 étant de préférence égaux.The central hole 20 of the sleeve 18 comprises a first bore 42 which opens on a first end 44 of the sleeve, a second bore 46 which opens at a second opposite end 48 of the sleeve and a middle part 50 which has a smaller diameter that the diameter of the first bore 42 and that the diameter of the second bore 46, the diameters of the bores 42 and 46 being preferably equal.

Comme cela a déjà été décrit de façon générale en relation avec la figure 1, on peut voir sur la figure 2 les détails de construction du système à accumulation d'énergie. Ce système d'accumulation d'énergie comprend la palette 4 qui est montée pivotante autour de l'axe 6 et le second ressort 8 qui sert à accumuler de l'énergie en vue d'actionner brutalement la palette 4. Le second ressort 8 a une extrémité fixée à une pièce d'ancrage fixe 51 et son autre extrémité est fixée à une partie d'ancrage 52 de la palette 4. La palette 4 comprend une extrémité d'accrochage 54 qui est éloignée de l'articulation 6. Ce système à accumulation d'énergie comprend en outre le verrou 55 qui est monté de façon pivotante autour de l'axe 56 et qui est poussé en permanence (dans le sens contraire des aiguilles d'une montre sur la figure 2) à l'aide d'un ressort 57 qui est enroulé autour de l'axe d'articulation 6 et qui est amarré au boîtier de l'appareil grâce à une de ces branches 58 qui vient s'appuyer en permanence contre une partie de la pièce d'ancrage 51. Le verrou 55 comprend une partie d'accrochage 60 qui vient coopérer avec la partie d'accrochage 54 de la palette 4, lorsque cette palette 4 est en position armée pour laquelle elle est déplacée par pivotement (dans le sens des aiguilles d'une montre sur la figure 2) dans le sens qui bande le second ressort 8. La palette 4 est destinée à commander un déplacement d'une barre de déclenchement (non représentée) qui est classiquement incluse dans un disjoncteur classique et qui est destinée elle-même à provoquer, de façon classique, la rupture de l'accrochage d'un mécanisme de commande de disjoncteur lui-même inclue dans un disjoncteur classique.As has already been described in general in relation to FIG. 1, one can see in FIG. 2 the construction details of the energy storage system. This energy storage system comprises the pallet 4 which is pivotally mounted around the axis 6 and the second spring 8 which is used to accumulate energy in order to suddenly activate the pallet 4. The second spring 8 has one end fixed to a fixed anchor piece 51 and its other end is fixed to an anchor part 52 of the pallet 4. The pallet 4 comprises a hooking end 54 which is distant from the articulation 6. This system energy storage further comprises the latch 55 which is pivotally mounted around the axis 56 and which is continuously pushed (counterclockwise in Figure 2) using 'a spring 57 which is wound around the hinge pin 6 and which is moored to the housing of the device by means of one of these branches 58 which come to bear permanently against a part of the anchoring part 51. The latch 55 comprises a hooking part 60 which comes to cooperate with the hooking part 54 of the pallet 4, when this pallet 4 is in the armed position for which it is moved by pivoting (clockwise in FIG. 2) in the direction which strips the second spring 8. The pallet 4 is intended to control a movement of a trigger bar (not shown) which is conventionally included in a conventional circuit breaker and which is itself intended to cause, in a conventional manner, the breaking of the attachment of a circuit breaker control mechanism itself included in a conventional circuit breaker.

Le verrou 55 est, en position armée, accroché à la palette 4 et est déplaçable (par pivotement dans le sens des aiguilles d'une montre sur la figure 2) à l'encontre du ressort 57 afin de libérer son accrochage à la palette 4 de façon à permettre à la palette 4, du fait de la détente du second ressort 8, de se déplacer brusquement par pivotement afin de provoquer le déplacement de la barre de déclenchement (non représentée) du disjoncteur (non représenté).The lock 55 is, in the armed position, hooked to the pallet 4 and is movable (by pivoting clockwise in FIG. 2) against the spring 57 in order to release its attachment to the pallet 4 so as to allow the pallet 4, due to the relaxation of the second spring 8, to move suddenly by pivoting in order to cause the displacement of the trip bar (not shown) of the circuit breaker (not shown).

Le déplacement du verrou 55 dans le sens qui provoque son désaccrochage de la palette 4 est obtenu par un déplacement approprié du poussoir 28. Sur la figure 2, on voit que l'extrémité 32 du poussoir 28 constitue une partie d'actionnement 32 du poussoir 28 et elle est située en regard et à une faible distance d'une partie d'actionnement 62 du verrou 55. Lorsque le déclencheur auxiliaire 1 est armé, c'est-à-dire lorsqu'il est dans la position représentée sur la figure 2, le verrou 55 est accrochée à la palette 4 et le verrou 55 est dans une position pivotée (dans le sens contraire des aiguilles d'une montre) de telle sorte que sa partie d'actionnement 62 soit située à une faible distance de la partie d'actionnement 32 du poussoir 28. Cette faible distance est appelée par la suite "garde". Bien entendu, dans cette position armée, le poussoir 28 est dans une position de repos telle que représentée sur la figure 2, et cette position de repos correspond en fait à une position du poussoir 28 dans laquelle il est complètement poussé (vers la droite) du fait que la bobine 10 est constamment alimentée en courant électrique et que cela a pour conséquence que le noyau mobile 24 est attiré contre le noyau fixe 22 (c'est-à-dire que l'entrefer 26 est rendu minimum). Si à un instant quelconque, le courant circulant dans la bobine 10 vient à devenir inférieur à un seuil prédéterminé, c'est-à-dire si la tension aux bornes de ladite bobine 10 devient nulle ou inférieure à un seuil prédéterminé, la force de compression du premier ressort 30 devient supérieure à la force d'attraction du noyau mobile 24 vers le noyau fixe 22, et le poussoir 28 se déplace alors vers la gauche sur la figure 2, c'est-à-dire en direction de la partie d'actionnement 62 du verrou 55, et ce déplacement du poussoir 28 provoque le pivotement (dans le sens des aiguilles d'une montre sur la figure 2) du verrou 55 qui se décroche alors de la palette 4, et cette palette 4 est alors libérée et se déplace brusquement sous l'action du second ressort 8.The displacement of the latch 55 in the direction which causes it to disengage from the pallet 4 is obtained by an appropriate displacement of the pusher 28. In FIG. 2, it can be seen that the end 32 of the pusher 28 constitutes an actuating part 32 of the pusher 28 and it is located opposite and at a short distance from an actuating part 62 of the latch 55. When the auxiliary trip device 1 is armed, that is to say when it is in the position shown in the figure 2, the latch 55 is hooked to the pallet 4 and the latch 55 is in a pivoted position (anti-clockwise) so that its actuating part 62 is located a short distance from the part actuation 32 of the pusher 28. This small distance is hereinafter called "guard". Of course, in this armed position, the pusher 28 is in a rest position as shown in FIG. 2, and this rest position corresponds in fact to a position of the pusher 28 in which it is completely pushed (to the right) the fact that the coil 10 is constantly supplied with electric current and that this has the consequence that the movable core 24 is attracted against the fixed core 22 (that is to say that the air gap 26 is made minimum). If at any time, the current flowing in the coil 10 becomes below a predetermined threshold, that is to say if the voltage across said coil 10 becomes zero or less than a predetermined threshold, the force of compression of the first spring 30 becomes greater than the force of attraction of the movable core 24 towards the fixed core 22, and the pusher 28 then moves to the left in FIG. 2, that is to say in the direction of the part actuation 62 of the latch 55, and this movement of the pusher 28 causes the pivoting 55 (in the clockwise direction in FIG. 2) of the latch 55 which is then released from the pallet 4, and this pallet 4 is then released and suddenly moves under the action of the second spring 8.

Une caractéristique essentielle de l'invention réside dans le fait que le second ressort 8 peut accumuler et libérer, lors de ses déplacements au cours du fonctionnement du déclencheur auxiliaire 1, une énergie mécanique supérieure à l'énergie mécanique qui peut être accumulée et libérée par le premier ressort 30 lors de ses déplacements au cours du fonctionnement du dispositif d'actionnement électromagnétique de ce même déclencheur auxiliaire 1.An essential characteristic of the invention resides in the fact that the second spring 8 can accumulate and release, during its movements during the operation of the auxiliary trip device 1, a mechanical energy greater than the mechanical energy which can be accumulated and released by the first spring 30 during its movements during the operation of the electromagnetic actuation device of this same auxiliary trip device 1.

Une autre caractéristique de la présente invention réside dans le fait qu'il est prévu la "garde" entre la partie d'actionnement 32 du poussoir 28 et la partie d'actionnement correspondante 62 du verrou 55, lorsque le verrou est accroché à la palette 4 et lorsque le poussoir 28 est normalement sollicité du fait de l'excitation normale de la bobine 10.Another characteristic of the present invention resides in the fact that the "guard" is provided between the actuating part 32 of the pusher 28 and the part corresponding actuation 62 of the latch 55, when the latch is attached to the pallet 4 and when the pusher 28 is normally stressed due to the normal excitation of the coil 10.

On voit que le déclencheur auxiliaire de la figure 2, qui constitue un déclencheur du type à déclenchement par manque de tension, peut fonctionner correctement alors que la bobine 10 est alimentée en courant électrique sous une très faible puissance électrique (par exemple faible tension et/ou un faible courant). En effet, la bobine 10 sert à créer une force électromécanique qui est juste suffisante pour vaincre la force de compression du premier ressort 30. Ce premier ressort 30 peut avoir une force de compression très faible. La force de compression du ressort 30 doit cependant être suffisante pour pouvoir actionner le verrou 55 afin que celui-ci libère la palette 4. Cependant, du fait qu'il est prévu une garde entre la partie d'actionnement 32 du ressort 28 et la partie d'actionnement correspondante 62 du verrou 55, lorsque la tension aux bornes de la bobine 10 diminue, même d'une façon très lente, jusqu'à devenir inférieure au seuil prédéterminé, le premier ressort 30 provoque soudainement un début du déplacement dudit poussoir 28 dans le sens de l'augmentation de l'entrefer 26, ce début de déplacement du poussoir 28 s'opérant d'une façon complètement indépendante du système d'accumulation d'énergie constitué par le verrou 55, la palette 4 et le second ressort 8 pendant tout le temps où le poussoir 28 se déplace en direction du verrou 55 de façon à supprimer la "garde" évoquée précédemment.It can be seen that the auxiliary trigger of FIG. 2, which constitutes a trigger of the type of triggering by lack of voltage, can function correctly while the coil 10 is supplied with electric current under a very low electric power (for example low voltage and / or a weak current). Indeed, the coil 10 is used to create an electromechanical force which is just sufficient to overcome the compression force of the first spring 30. This first spring 30 can have a very low compression force. The compression force of the spring 30 must however be sufficient to be able to actuate the latch 55 so that the latter releases the pallet 4. However, because there is a guard between the actuating part 32 of the spring 28 and the corresponding actuating part 62 of the latch 55, when the voltage across the terminals of the coil 10 decreases, even in a very slow manner, until it becomes below the predetermined threshold, the first spring 30 suddenly causes the movement of said pusher to start 28 in the direction of the increase in the air gap 26, this start of displacement of the pusher 28 operating completely independently of the energy storage system constituted by the latch 55, the pallet 4 and the second spring 8 during all the time when the pusher 28 moves in the direction of the latch 55 so as to remove the "guard" mentioned above.

Il résulte de cela qu'il est dans ces conditions possible de concevoir un ensemble mécanique constitué essentiellement par le noyau fixe 22, le noyau mobile 24, le poussoir 28 et le premier ressort 30 qui peut fonctionner d'une façon précise, sensible (c'est-à-dire avec des forces de frottement très limitées) et fiable, de façon à pouvoir constituer le seuil prédéterminé précis et fiable pour lequel le déclencheur auxiliaire provoque l'action de déclenchement.It follows from this that it is in these conditions possible to design a mechanical assembly consisting essentially of the fixed core 22, the movable core 24, the pusher 28 and the first spring 30 which can operate in a precise, sensitive manner (c is to say with very limited friction forces) and reliable, so as to be able to constitute the precise and reliable predetermined threshold for which the auxiliary trigger triggers the triggering action.

En outre, une telle caractéristique de précision et de fiabilité du seuil de déclenchement du déclencheur auxiliaire peut être obtenue pour une puissance électrique consommée dans la bobine 10 extrêmement faible, par exemple de l'ordre de quelques milliwatts.In addition, such a characteristic of precision and reliability of the triggering threshold of the auxiliary trip device can be obtained for an extremely low electrical power consumed in the coil 10, for example of the order of a few milliwatts.

La figure 4 représente un diagramme présentant les variations de la force d'attraction du noyau mobile 24 vers le noyau fixe 22 ainsi que les variations de la force de poussée du poussoir 28 contre la partie d'actionnement 62 du verrou 55, cela en fonction de la position prise par le poussoir 28. Sur l'axe des abscisses, la position 0 correspond à la position du poussoir 28 lorsque le noyau mobile 24 est complètement attiré vers le noyau fixe 22. On voit que tant que la tension aux bornes de la bobine 10 est supérieure à un seuil prédéterminé, la force d'attraction du noyau mobile vers le noyau fixe pour l'entrefer minimum est supérieure à la force de poussée du ressort 30. Le point A du graphique correspond au seuil de tension pour lequel la force d'attraction est égale à la force de poussée du ressort 30.FIG. 4 represents a diagram showing the variations of the force of attraction of the movable core 24 towards the fixed core 22 as well as the variations of the pushing force of the pusher 28 against the actuating part 62 of the latch 55, this as a function from the position taken by the pusher 28. On the abscissa axis, position 0 corresponds to the position of the pusher 28 when the movable core 24 is completely attracted to the fixed core 22. It can be seen that as long as the voltage across the terminals of the coil 10 is greater than a predetermined threshold, the force of attraction of the movable core towards the fixed core for the minimum air gap is greater than the pushing force of the spring 30. The point A of the graph corresponds to the tension threshold for which the attraction force is equal to the pushing force of the spring 30.

Si la tension aux bornes de la bobine 10 chute de façon à passer en dessous de la valeur de seuil correspondant au point A, le poussoir 28 se déplace en direction du verrou 55 brusquement. La force de poussée du poussoir 28 suit le segment linéaire A-B pendant le rattrapage de la garde qui existe entre le poussoir 28 et le verrou 55, puis ensuite le poussoir 28 pousse le verrou 55 et, du fait des forces de frottement et de résistances mécaniques diverses régnant dans le mécanisme du verrou 55 et de la palette 4 qui s'opposent au déplacement du verrou 55, la force de poussée réelle du poussoir 28 est réduite de ces forces de résistance, de telle sorte que la force de poussée réelle du poussoir 28 suit sur le graphique les segments B-C puis C-D. Cependant, dans le même temps, la force d'attraction du noyau mobile 24 vers le noyau fixe 22 suit la courbe A-E qui décroît très rapidement et, à chaque instant, cette courbe A-E reste en dessous des trajets A-B-C-D.If the voltage across the terminals of the coil 10 drops so as to fall below the threshold value corresponding to point A, the pusher 28 moves suddenly towards the latch 55. The pushing force of the pusher 28 follows the linear segment AB during the recovery of the guard which exists between the pusher 28 and the latch 55, then then the pusher 28 pushes the latch 55 and, due to the friction forces and mechanical resistances various reigning in the mechanism of the latch 55 and of the pallet 4 which oppose the displacement of the latch 55, the real pushing force of the pusher 28 is reduced by these resistance forces, so that the actual pushing force of pusher 28 follows on the graph the segments BC then CD. However, at the same time, the force of attraction of the mobile core 24 towards the fixed core 22 follows the curve AE which decreases very quickly and, at all times, this curve AE remains below the paths ABCD.

Il résulte de cela que, lorsque le poussoir 28 a commencé à se déplacer en direction du verrou 55, du fait que la tension appliquée à la bobine 10 est devenue égale ou légèrement inférieure à la tension de seuil prédéterminée, le déplacement ne peut plus s'interrompre jusqu'à ce que le poussoir 28 actionne complètement le verrou 55, quelque soient les forces de résistances mécaniques qui sont plus ou moins aléatoires et variables et qui concernent l'ensemble du mécanisme de déclenchement constitué par le verrou 55, la palette 4 et le second ressort 8. Sur le graphique, la variation de force mesurée sur l'axe des ordonnés correspondant au segment B-C correspond à la somme des forces mécaniques aléatoires qui peuvent s'opposer à l'actionnement du verrou 55. Pour représenter le fait que ces forces mécaniques sont aléatoires, on a représenté des points C'-D' différent des points C-D afin de montrer que ces forces mécaniques de résistance au déplacement du verrou 55 peuvent varier dans une large proportion sans pour autant influer sur le fait que lorsque le poussoir 28 commence à se déplacer pour actionner le verrou 55 il va jusqu'à la fin de sa course de déplacement afin d'actionner complètement le verrou 55.It follows from this that, when the pusher 28 has started to move in the direction of the latch 55, owing to the fact that the voltage applied to the coil 10 has become equal to or slightly less than the predetermined threshold voltage, the movement can no longer s '' interrupt until the pusher 28 fully actuates the latch 55, whatever the mechanical resistance forces which are more or less random and variable and which relate to the entire triggering mechanism constituted by the latch 55, the pallet 4 and the second spring 8. On the graph, the force variation measured on the ordinate axis corresponding to the segment BC corresponds to the sum of the random mechanical forces which can oppose the actuation of the latch 55. To represent the fact that these mechanical forces are random, we have represented points C'-D 'different from points CD in order to show that these mechanical forces of resistance to displacement of the latch 55 can vary in a large proportion without influencing the fact that when the pusher 28 begins to move to actuate the latch 55 it goes to the end of its movement stroke in order to fully actuate the latch 55 .

Sur la figure 3, on distingue le déclencheur auxiliaire 1 qui a déjà été décrit en relation avec les figures 1 et 2 mais qui est monté de façon différente de façon à constituer un déclencheur auxiliaire du type à déclenchement par l'émission de courant. On voit que l'on peut constituer ainsi un déclencheur auxiliaire à déclenchement par émission de courant en utilisant pratiquement les mêmes pièces que celles du déclencheur auxiliaire du type à déclenchement par manque de tension de la figure 2.In FIG. 3, a distinction is made between the auxiliary trigger 1 which has already been described in relation to FIGS. 1 and 2 but which is mounted differently so as to constitute an auxiliary trigger of the type triggered by the emission of current. We see that we can thus constitute an auxiliary trigger to release by current emission using practically the same parts as those of the auxiliary release of the type with release by undervoltage of figure 2.

Sur la figure 3, les mêmes index de référence ont été utilisés pour les mêmes pièces que celles utilisées sur la figure 2, même lorsque ces mêmes pièces ne sont pas montées de la même façon ni dans le même sens sur ces figures.In FIG. 3, the same reference indexes have been used for the same parts as those used in FIG. 2, even when these same parts are not mounted in the same way or in the same direction in these figures.

Les différences entre le déclencheur auxiliaire de la figure 3 et le déclencheur auxiliaire de la figure 2 sont les suivantes :

  • le noyau fixe 22 est monté dans le premier alésage 42 pour le déclencheur auxiliaire de la figure 2 alors que le noyau fixe 22A est monté dans le second alésage 46 pour le déclencheur auxiliaire de la figure 3 ; et
  • le noyau fixe 22A du déclencheur auxiliaire de la figure 3 peut être conçu d'une façon totalement identique au noyau fixe 22 du déclencheur auxiliaire de la figure 2 mais il peut aussi être conçu d'une façon légèrement différente, comme cela est représenté effectivement sur la figure 3, cette différence consistant en ce que le noyau fixe 22 peut inclure la pièce de réglage 40 servant à régler la force de compression du premier ressort 30 alors que le noyau fixe 22A n'a pas besoin d'inclure une telle pièce 40.
The differences between the auxiliary trigger in Figure 3 and the auxiliary trigger in Figure 2 are as follows:
  • the fixed core 22 is mounted in the first bore 42 for the auxiliary release of Figure 2 while the fixed core 22A is mounted in the second bore 46 for the auxiliary release of Figure 3; and
  • the fixed core 22A of the auxiliary trip device of FIG. 3 can be designed in a completely identical way to the fixed core 22 of the auxiliary trip device of FIG. 2 but it can also be designed in a slightly different way, as is effectively represented on FIG. 3, this difference consisting in that the fixed core 22 can include the adjusting part 40 serving to adjust the compression force of the first spring 30 while the fixed core 22A does not need to include such a part 40 .

L'ensemble formé par le noyau fixe 22A, le noyau mobile 24, le poussoir 28 et le premier ressort 30 peut être monté à l'intérieur du trou du fourreau 18 des deux manières suivantes :

  • soit en logeant fixement le noyau fixe 22 ou 22A dans le premier alésage 42 de façon à constituer un déclencheur auxiliaire du type à déclenchement par manque de tension (voir figure 2),
  • soit en logeant fixement le noyau fixe 22 ou 22A dans le second alésage 46 de façon à constituer un déclencheur auxiliaire du type à déclenchement par émission de courant (voir figure 3).
The assembly formed by the fixed core 22A, the movable core 24, the pusher 28 and the first spring 30 can be mounted inside the hole in the sheath 18 in the following two ways:
  • either by fixedly accommodating the fixed core 22 or 22A in the first bore 42 so as to constitute an auxiliary trip device of the type triggered by lack of voltage (see FIG. 2),
  • either by fixedly accommodating the fixed core 22 or 22A in the second bore 46 so as to constitute an auxiliary trip device of the type with release by current emission (see FIG. 3).

Le déclencheur auxiliaire 1 du type à déclenchement par émission de courant tel que représenté sur la figure 3 fonctionne "à l'envers" du déclencheur de la figure 2 dans le sens où le déclencheur auxiliaire de la figure 3 se déclenche, c'est-à-dire déverrouille le verrou 55, lorsqu'un courant électrique traversant la bobine 10 devient supérieur à un seuil prédéterminé.The auxiliary trigger 1 of the type with triggering by emission of current as shown in FIG. 3 operates "backwards" from the trigger of FIG. 2 in the direction in which the auxiliary trigger of FIG. 3 is triggered, that is to say that is, unlocks the latch 55 when an electric current passing through the coil 10 becomes greater than a predetermined threshold.

On voit qu'il n'est pas prévu dans le déclencheur auxiliaire du type à déclenchement par émission de courant représenté sur la figure 3 un quelconque moyen de réglage du seuil prédéterminé de déclenchement, bien que cela pourrait être envisagé facilement par l'homme du métier, parce qu'en général un tel déclencheur auxiliaire du type à déclenchement par émission de courant ne nécessite pas un déclenchement pour un seuil prédéterminé très précis.It can be seen that there is no provision in the auxiliary trigger of the trigger type by current emission shown in FIG. 3 for any means of adjusting the predetermined trigger threshold, although this could easily be envisaged by those skilled in the art. profession, because in general such an auxiliary release of the type with release by current emission does not require a release for a very precise predetermined threshold.

L'invention n'est pas limitée au mode de réalisation qui a été décrit en relation avec les figures 2 et 3. De nombreuses modifications ou de nombreux perfectionnements peuvent y être apportés. Ainsi, on peut perfectionner le dispositif en prévoyant un pallier 64 (voir aussi bien figure 2 que figure 3) qui entoure le noyau mobile 24 et qui est logé dans l'alésage 42 ou 46 du fourreau 18. Cette pièce 64 sert à supporter et guider le noyau mobile 24 lors de son déplacement longitudinal. En effet, le noyau mobile 24 doit avoir un diamètre externe inférieur au diamètre interne de la partie rétrécie 50 pour pouvoir être monté, et il ne peut donc pas être directement guidé par l'alésage 42 ou 46.The invention is not limited to the embodiment which has been described in relation to FIGS. 2 and 3. Numerous modifications or numerous improvements can be made to it. Thus, the device can be improved by providing a bearing 64 (see both Figure 2 and Figure 3) which surrounds the movable core 24 and which is housed in the bore 42 or 46 of the sleeve 18. This part 64 serves to support and guide the movable core 24 during its longitudinal displacement. In fact, the mobile core 24 must have an external diameter smaller than the internal diameter of the narrowed part 50 in order to be able to be mounted, and it cannot therefore be directly guided by the bore 42 or 46.

Claims (2)

  1. An auxiliary trip device (1) for a circuit breaker,
    said circuit breaker comprising : a circuit breaker operating mechanism ; a trip bar movable in such a way as to bring about breaking of the latching of the circuit breaker operating mechanism ; and at least one main trip device designed to command movement of the trip bar,
    said auxiliary trip device (1) comprising, in a trip device case : an electromechanical actuating device including a coil (10) surrounding a sheath (18), in the sheath, a fixed core (22), a plunger (24) defining an air-gap (26) with the fixed core, a push-rod (28) connected to the plunger and a first spring (30) continuously pushing the push-rod in the direction increasing the size of the air-gap (26) ; and an energy storage system including a blade (4) designed to command movement of said trip bar, a second spring (8) storing energy to actuate the blade and a latch (55) latched to the blade and movable to release its latching to the blade,
    characterized in that :
    said second spring (8) stores and releases, during its movements in the course of operation of said auxiliary trip device (1), an energy greater than the energy stored and released by said first spring (30) during its movements in the course of operation of said electromechanical actuating device ; and
    an actuating part (32 or 34) of the push-rod (28) can push on an actuating part (62) of the latch (55) in such a way that movement of the latch in the direction of releasing of its latching to the blade is caused by movement of the push-rod (28) in a specific direction, a clearance being provided between said actuating part (32 or 34) of the push-rod and said actuating part (62) of the latch when the push-rod is not moved in said specific direction.
  2. The auxiliary trip device according to claim 1, characterized in that :
    the push-rod (28) is fixed to the plunger (24) and extends slidingly through the fixed core (22) ;
    the first spring (30) surrounds the push-rod and exerts a thrust at the level of its two ends respectively on the fixed core and on the plunger, in the direction of their separation away from one another;
    the external diameter of the fixed core (22) is greater than the external diameter of the plunger (24) ; and
    the sheath (18) has a central hole which passes longitudinally through said sheath (18) and which comprises a first bore (42) opening out onto a first end, a second bore (46) of appreciably the same diameter and opening out onto an opposite second end, and a middle part (50) of a smaller diameter than that of said first and second bores ; which results in the assembly formed by the fixed core (22), plunger (24), push-rod (28) and first spring (30) being able to be mounted inside the hole of the sheath (18) in the following two manners : either by housing the fixed core (22) fixedly in the first bore (42 in figure 2) so as to constitute an auxiliary trip device of the undervoltage release type or by housing the fixed core (22) fixedly in the second bore (46 in figure 3) so as to constitute an auxiliary trip device of the shunt release type.
EP94410022A 1993-04-16 1994-04-06 Auxiliary trip device for circuit breaker Expired - Lifetime EP0620580B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9304857 1993-04-16
FR9304857A FR2704090B1 (en) 1993-04-16 1993-04-16 AUXILIARY TRIGGER FOR CIRCUIT BREAKER.

Publications (2)

Publication Number Publication Date
EP0620580A1 EP0620580A1 (en) 1994-10-19
EP0620580B1 true EP0620580B1 (en) 1997-05-07

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ID=9446406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94410022A Expired - Lifetime EP0620580B1 (en) 1993-04-16 1994-04-06 Auxiliary trip device for circuit breaker

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US (1) US5512720A (en)
EP (1) EP0620580B1 (en)
DE (1) DE69403023T2 (en)
ES (1) ES2104316T3 (en)
FR (1) FR2704090B1 (en)

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Also Published As

Publication number Publication date
DE69403023D1 (en) 1997-06-12
FR2704090A1 (en) 1994-10-21
EP0620580A1 (en) 1994-10-19
FR2704090B1 (en) 1995-06-23
DE69403023T2 (en) 1997-10-30
ES2104316T3 (en) 1997-10-01
US5512720A (en) 1996-04-30

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