EP0617448A1 - Protection group with double interruption - Google Patents

Protection group with double interruption Download PDF

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Publication number
EP0617448A1
EP0617448A1 EP94830139A EP94830139A EP0617448A1 EP 0617448 A1 EP0617448 A1 EP 0617448A1 EP 94830139 A EP94830139 A EP 94830139A EP 94830139 A EP94830139 A EP 94830139A EP 0617448 A1 EP0617448 A1 EP 0617448A1
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EP
European Patent Office
Prior art keywords
valve
double
fuse
coil
load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94830139A
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German (de)
French (fr)
Inventor
Rino Calzolari
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Individual
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Individual
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Publication date
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Publication of EP0617448A1 publication Critical patent/EP0617448A1/en
Withdrawn legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/44Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/04Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121Load break switches
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/122Automatic release mechanisms with or without manual release actuated by blowing of a fuse

Definitions

  • the object of the invention is to propose a protection group to be associated with a switch or disconnector under load, in order to protect circuits and electrical mechanisms of different types.
  • the group has been studied in order to avoid complications during the restart, to reduce its costs of replacing defective components and to achieve other goals and advantages, which will be described below.
  • the protection group in question and of the double break type comprising, arranged in series, a fusible valve calibrated at high values of supercurrent and an electromagnetic coil calibrated so as to act, at lower values of supercurrent control device suitable for manual resetting.
  • the group in question can be associated with a switch under load, intended to be controlled in one of two possible ways, by means of a double control articulation, adapted so as to act on the member.
  • controlling said switch under load by means of one or the other of the two tripping members, one of which is controlled by the fuse valve and the other by the electromagnetic coil; a timer being provided, allowing the disconnector to open under load, after the expiration of the valve melting time.
  • Said articulation can be formed by two small levers cooperating with each other, one of them being actuated by the triggering member of the fuse valve and controlling the switch under load in order to open it, and the other being actuated by the member controlled by the coil and acting on the first small lever.
  • an insulating support supporting the articulation serving for the double control of the switch under load, is mounted using a metal strip on one of the terminals of the fuse valve, from which the corresponding trigger member of this valve can project.
  • Said insulating support and an insulated support, mounted on the other of the terminals of the fuse valve, fully support the group consisting of the electromagnetic coil and the mechanical control and reset system associated therewith and intended to act on the trigger.
  • the group advantageously comprises a delay device, that is to say a timer, adapted so as to slow down the movement of the lever due to the impulse caused by the coil traversed by the current; said device allowing the delayed opening of the disconnector under load, when the fuse has not blown because it has supported a low current load, while under the effect of a high current load, the fuse has melted before opening the disconnector under load; in both cases, the installation mechanisms being protected.
  • a delay device that is to say a timer, adapted so as to slow down the movement of the lever due to the impulse caused by the coil traversed by the current; said device allowing the delayed opening of the disconnector under load, when the fuse has not blown because it has supported a low current load, while under the effect of a high current load, the fuse has melted before opening the disconnector under load; in both cases, the installation mechanisms being protected.
  • the electromagnetic coil can be provided with a greater number of connection terminals in order to vary the amperage while maintaining the same value of the product ampere-turns , depending on the terminal connected.
  • the references P1 and P3 denote two mounting clamps of the group in question, which are supported by a panel on which is also mounted a switch under load designated by the reference IS, the member of which control for opening is designated by the letter C and must be moved from the position of Figure 1 to the position of Figure 2, in order to obtain the opening of the switch under load IS, the group in issue being described below.
  • the clamps P1 and P2 are in contact with the terminals 1 and 3 of a fuse valve VF with a high current value and with a limited delay in response to the melting and therefore at the opening of the circuit, according to relatively limited current values.
  • the VF fuse valve is capable of interrupting the circuit, and therefore controlling the opening of the IS switch, in the presence of very high supercurrent values in exceptional cases such as lightning or analogous, while in the presence of low supercurrent values, this fuse valve does not act on the (typical) slowness of the fuse blowing, the valve then remaining intact when there are current interruptions caused by the device described below and arranged in series with the valve VF; this device allows a relatively simple and rapid return to operation without replacing the VF valve.
  • a movable element 1A which is coaxial with the upper terminal 1 of this valve and causes, under the effect of the melting of the fuse VF, the triggering of an upward movement of a small lever member 10, arranged in an intermediate manner within the movable element 1A of the fuse valve VF, in order to ensure the control of the member C of the IS load switch.
  • the small intermediate lever 10 of this control is articulated at 12 relative to a support 14 which is mounted on the terminal 1.
  • the support 14 comprises (see in particular FIG. 4) two insulating plates, between which the pin 12 extends and the small lever 10; the support plates 14 are supported by a strip 14B by means of small insulating blocks 14A.
  • the small lever 10 disposed between the triggering member 1A of the valve VF and the control member C of the switch IS is extended by an appendage 10A which cooperates with the appendage 16A of a small lever 16 articulated at 18 relative to the support 14, so that a sudden lifting of the small lever 16 (anticlockwise with respect to FIG. 1) causes a corresponding displacement of the small lever 10 and therefore a control of the operating member C of the switch IS, in the same manner as that which can be carried out by the movable member 1A of the fuse valve VF. Consequently, a command to open the switch under load IS can be caused by the melting of the fuse valve VF (and therefore by the actuation of the triggering member 1A) or by the action on the small lever 16.
  • This action on the small lever 16 is obtained by a rod 20 resiliently biased, which is moved jerkily upwards, for the above operation, during an overcurrent of limited magnitude which causes the activation of an electromagnetic coil 22 in the manner indicated below; the rod 20 is produced in the form of a rack which can be maneuvered by a toothed sector 24 secured to a small operating lever 24A, in order to allow the device associated with the coil 22 to be put back into operation.
  • the toothed sector 24 and the small lever 24A are articulated at 26 with respect to a band 28 which is secured to the support 14 and in contact with a holding column 30 parallel and disposed next to the valve VF.
  • This column 30 supports in the lower part a housing 32 intended for mechanical triggering members indicated below; the whole is supported in the lower part by a ring 34 which constitutes a contact terminal which can be associated with the clamp P3, by means of a contact in the form of a strip 36; the whole is supported in isolation by an insulation component 38 which is mounted around the terminal 3 of the valve VF; this terminal 3 is in contact, via a wire clamp 40, with a conductor 42, in turn connected to a wire clamp 43 intended for terminal 22A of the coil 22; the other terminal 22B of the coil 22 is connected at 43A and conveys the current to the lower part of the structure in order to connect, via the strip 34, 36, the lower part of the valve, up to that it comes into contact with the P3 support clamp for the whole group.
  • Coil 22 has an anchoring element 50 which can move axially.
  • the element 50 is held in the lower part by a spring or gravity system and can be lifted by an extra-current which circulates in the coil 22, to a value greater than a calibration limit, which is why, when is in the presence of a relatively limited extra current, the lifting of the movable member 50 of the coil 22 is caused; this causes the angular displacement of a small lever 52 articulated at 54 relative to a U-shaped support 53, mounted on the plate 46 by means of the retaining bracket 48 of the coil.
  • the small lever 52 which is controlled by the coil 22, is articulated relative to the upper end of a rod 58, the lower end of which is articulated relative to a small lever 60 articulated at 62 relative to the part bottom of the housing structure 32, in order to control a mushroom member 66 of a triggering device.
  • This member 66 causes the displacement of a small lever which prevented the actuation of pressure springs 80; consequently, the springs 80 are released and act on the lever 70.
  • the element 66 acts on a triggering device generally designated by the reference 68, serving to release the lever 70 by means of an operating knob 70A and an upper branch 70B, adapted so as to act on a rod 74 adapted so as to control the trigger element 20 in the manner indicated below;
  • the lever 70 is biased downwards, by means of a rack 78, by the springs 80, from the position of FIG. 1 to the position of FIG. 2, so as to bring about the return of the rod 74, when the device 68 is actuated by the mushroom 66 in order to disengage the lever 70 from the cocking position shown in FIG. 1.
  • the rod 74 (and therefore, finally, the lever 70 which moves jerkily downwards ) causes the action on a small square 84 articulated laterally with respect to the support 28, in order to cause, against the action of a couple of springs 86, the release of a radial latch 88 which releases the device for triggering the rod 20, adapted so to be carried out in conjunction with the jerky lifting of the lever 16 or 10 and therefore of the member C, the opening of the switches under load IS.
  • This jerky movement of the member 20, enabled by the latch 88 is achieved using a spring 90, which bears against the member 24, 24A.
  • the opening of the switch IS is therefore finally caused by the return of the movable member 50 of the coil 22 under the effect of the extra-current of limited magnitude, which can pass into the coil 22 even in the case of 'events not exceptional, but which must always cause the opening of the IS switch; this control of the coil 22 is therefore carried out by means of the lever 52, the rod 58, the small lever 60, the mushroom member 66, the holding device 68 and the lever 70, using the transmission 74, 84, 88.
  • the lifting of the member 20 is caused by the spring 90 disposed under the latter; this lifting causes the small lever 24A to lower the toothed sector 24, which is why, as regards both the projection of the member 20 and the lowering of the small lever 24, it is possible to visually control the phenomenon which has enabled opening of the IS load switch. Another visual control is enabled by the possible observation capacity of the member 1A raised under the effect of the fusion of the valve VF in an exceptional case.
  • the opening of a switch under load IS can be controlled by studying the position of these members 1A, 20, 24A and also 70A by the operator, who can thus intervene when the phenomenon which has interrupted the power supply acting on the IS switch has been established by a extra-current of limited magnitude and therefore under the effect of the action of the coil 22; it is therefore possible, by simple action on the operating lever 24A and 70A, to restore the power after checking for any damage which could be verified downstream of the transformer controlled by the entire complex described and by the IS switch.
  • a timer which is of the mechanical type and adapted so as to retain the lever 70, for a predetermined time, before its complete movement, is associated with the lever 70 which is intended, by its own movement, to open the main circuit by absence of blown fuse, for the purposes indicated below.
  • the timer group is generally designated by the reference 101 and includes a gear train for the member 120 which can be loaded manually with an elastic accumulator.
  • Reference 103 designates a small lever for loading the timer; the reference 105 designates a sector which is intended to release the timer in order to put it into operation and the reference 107 designates a sector, coaxial with respect to the previous one, which is activated by the timer.
  • the latter comprises a disc 109 provided with a plurality, in particular four, of pins 109A adapted so as to come into contact with the two sectors.
  • a rotation of a toothed disc 112 which is controlled by the timer 120 applied to the outside of the housing. , is provoked.
  • This disc meshes with an arcuate rack 114 extending between two rebates 116A, 116B of a sector 116, which is integral with the arm 70B of the lever 70, 70A.
  • the rack 114 When the lever is raised, the rack 114 is driven on the rebate 116B; when the lever 70, 70A, 70B is released (as described above, while the device is contained in the housing 32), the latter can move in spurts over a limited stroke which is allowed by the movement on the rack 114, from the rebate 116B to the rebate 116A, after which a place the braking effect of the timer 120, which ends the race of the complex 70, 74 and therefore that of the 16, 10 only after a predetermined time, before operating the circuit opening, while allowing the organ 109 to turn.
  • the intensity range of the currents which can leave the transformer and pass through the coil and the valve is between 1 to 2 A and 300 to 4000 A, the average value of a short circuit.
  • the coil can be constructed using a double or triple number of turns, so as to present two or three current injection points and to be used for example for the passage of a current of 10 A, 20 A or 30 A, while still being able to exert the force of expulsion of the central journal, the product A x N turns, that is to say the value in ampere-turns, therefore being constant.

Abstract

The unit may be associated with a switch under load (IS) which can be controlled in two ways according to two overcurrent values, by means of a dual-control articulation (10,16), configured in such a way as to act on the control member (C) of the said switch under load (IS) by means of one or the other of the two triggering members (1A,20), one of which is controlled by the fusible valve (VF) and the other by the electromagnetic coil (22); a time delay (101,120) allows the switch under load (IS) to be opened after the expiry of the melting time of the fusible valve. <IMAGE>

Description

L'invention a pour but de proposer un groupe de protection à associer à un interrupteur ou sectionneur sous charge, afin de protéger des circuits et des mécanismes électriques de différents types. Le groupe a été étudié en vue d'éviter des complications lors de la remise en fonctionnement, de réduire ses coûts de remplacement de composants défectueux et d'atteindre d'autres buts et avantages, qui vont être décrits ci-après.The object of the invention is to propose a protection group to be associated with a switch or disconnector under load, in order to protect circuits and electrical mechanisms of different types. The group has been studied in order to avoid complications during the restart, to reduce its costs of replacing defective components and to achieve other goals and advantages, which will be described below.

Le groupe de protection en question et du type à double rupture comprenant, disposées en série, une soupape fusible étalonnée à des valeurs élevées d'extracourant et une bobine électromagnétique étalonnée de façon à agir, à des valeurs d'extracourant plus faibles, sur un dispositif de commande adapté à un réarmement manuel.The protection group in question and of the double break type comprising, arranged in series, a fusible valve calibrated at high values of supercurrent and an electromagnetic coil calibrated so as to act, at lower values of supercurrent control device suitable for manual resetting.

Selon l'invention, le groupe en question peut être associé à un interrupteur sous charge, destiné à être commandé selon l'une des deux manières possibles, au moyen d'une articulation à double commande, adaptée de façon à agir sur l'organe de commande dudit interrupteur sous charge au moyen de l'un ou l'autre des deux organes de déclenchement, dont l'un est commandé par la soupape fusible et l'autre par la bobine électromagnétique; un temporisateur étant prévu, permettant l'ouverture du sectionneur sous charge, après l'écoulement du temps de fusion de la soupape.According to the invention, the group in question can be associated with a switch under load, intended to be controlled in one of two possible ways, by means of a double control articulation, adapted so as to act on the member. controlling said switch under load by means of one or the other of the two tripping members, one of which is controlled by the fuse valve and the other by the electromagnetic coil; a timer being provided, allowing the disconnector to open under load, after the expiration of the valve melting time.

Ladite articulation peut être formée par deux petits leviers coopérant entre eux, l'un d'entre eux étant actionné par l'organe de déclenchement de la soupape fusible et commandant l'interrupteur sous charge en vue de l'ouvrir, et l'autre étant actionné par l'organe commandé par la bobine et agissant sur le premier petit levier.Said articulation can be formed by two small levers cooperating with each other, one of them being actuated by the triggering member of the fuse valve and controlling the switch under load in order to open it, and the other being actuated by the member controlled by the coil and acting on the first small lever.

Selon une forme possible d'actionnement, un support isolant, supportant l'articulation servant à la double commande de l'interrupteur sous charge, est monté à l'aide d'une bande métallique sur l'une des bornes de la soupape fusible, de laquelle peut faire saillie l'organe de déclenchement correspondant de cette soupape. Ledit support isolant et un support isolé, monté sur l'autre des bornes de la soupape fusible, supportent entièrement le groupe composé de la bobine électromagnétique et du système de commande mécanique et de réarmement lui étant associé et destiné à agir sur l'organe de déclenchement.According to a possible form of actuation, an insulating support, supporting the articulation serving for the double control of the switch under load, is mounted using a metal strip on one of the terminals of the fuse valve, from which the corresponding trigger member of this valve can project. Said insulating support and an insulated support, mounted on the other of the terminals of the fuse valve, fully support the group consisting of the electromagnetic coil and the mechanical control and reset system associated therewith and intended to act on the trigger.

Le groupe comprend de façon avantageuse un dispositif retardateur, c'est-à-dire un temporisateur, adapté de façon à ralentir le déplacement du levier dû à l'impulsion provoquée par la bobine traversée par le courant; ledit dispositif permettant l'ouverture retardée du sectionneur sous charge, lorsque le fusible n'a pas fondu du fait qu'il a supporté une faible charge de courant, tandis que sous l'effet d'une charge de courant élevée, le fusible a fondu avant l'ouverture du sectionneur sous charge; dans les deux cas, les mécanismes de l'installation étant protégés.The group advantageously comprises a delay device, that is to say a timer, adapted so as to slow down the movement of the lever due to the impulse caused by the coil traversed by the current; said device allowing the delayed opening of the disconnector under load, when the fuse has not blown because it has supported a low current load, while under the effect of a high current load, the fuse has melted before opening the disconnector under load; in both cases, the installation mechanisms being protected.

En ce qui concerne les actions à des valeurs relativement faibles d'extracourant, la bobine électromagnétique peut être pourvue d'un plus grand nombre de bornes de connexion en vue de faire varier l'ampèrage tout en conservant la même valeur du produit ampères-tours, selon la borne connectée.With regard to actions at relatively low values of extra-current, the electromagnetic coil can be provided with a greater number of connection terminals in order to vary the amperage while maintaining the same value of the product ampere-turns , depending on the terminal connected.

L'invention va être mieux comprise à la lecture de la description qui suit et en se référant au dessin annexé, qui représente un exemple de mise en oeuvre non-limitatif de cette invention.The invention will be better understood on reading the description which follows and with reference to the appended drawing, which represents an example of non-limiting implementation of this invention.

Sur le dessin :

les figures 1 et 2
représentent deux vues de côté du dispositif à soupape à double rupture, dans des positions de fonctionnement normal et d'ouverture des interrupteurs sous charge;
la figure 3
représente une vue à échelle réduite, suivant les lignes III-III de la figure 1;
les figures 4 et 5
représentant deux vues d'extrémité suivant les lignes IV-IV et V-V de la figure 1.
On the drawing :
Figures 1 and 2
represent two side views of the double-break valve device, in normal operating and open positions of the switches under load;
figure 3
shows a view on a reduced scale, along lines III-III of Figure 1;
Figures 4 and 5
representing two end views along lines IV-IV and VV of Figure 1.

Selon ce qui est illustré sur le dessin annexé, les références P1 et P3 désignent deux pinces de montage du groupe en question, qui sont supportées par un panneau sur lequel est également monté un interrupteur sous charge désigné par la référence IS, dont l'organe de commande destiné à l'ouverture est désigné par la lettre C et doit être déplacé de la position de la figure 1 à la position de la figure 2, afin d'obtenir l'ouverture de l'interrupteur sous charge IS, le groupe en question étant décrit ci-après. Les pinces P1 et P2 sont en contact avec les bornes 1 et 3 d'une soupape fusible VF à valeur élevée de courant et à retard limité de réponse à la fusion et donc à l'ouverture du circuit, selon des valeurs de courant relativement limitées; par conséquent, la soupape fusible VF est susceptible d'effectuer l'interruption du circuit, et donc la commande de l'ouverture de l'interrupteur IS, en présence de valeurs très élevées d'extracourant dans des cas exceptionnels tels que la foudre ou analogue, tandis qu'en présence de faibles valeurs d'extracourant, cette soupape fusible n'agit pas sur la lenteur (typique) de la fusion du fusible, la soupape restant alors intacte lorsqu'il se produit des interruptions de courant provoquées par le dispositif décrit ci-après et disposé en série avec la soupape VF; ce dispositif permet une remise en fonctionnement relativement simple et rapide sans remplacer la soupape VF. En vue d'assurer la commande directe par la soupape VF, il est prévu de manière connue et classique un élément mobile 1A qui est coaxial par rapport à la borne supérieure 1 de cette soupape et provoque, sous l'effet de la fusion du fusible VF, le déclenchement d'un déplacement vers le haut d'un organe à petit levier 10, disposé de façon intermédiaire au sein de l'élément mobile 1A de la soupape fusible VF, afin d'assurer la commande de l'organe C de l'interrupteur sous charge IS. Le petit levier 10 intermédiaire de cette commande est articulé en 12 par rapport à un support 14 qui est monté sur la borne 1. Le support 14 comporte (voir en particulier la figure 4) deux plaques isolantes, entre lesquelles s'étendent le tourillon 12 et le petit levier 10; les plaques de support 14 sont supportées par une bande 14B par l'intermédiaire de petits blocs isolants 14A. Le petit levier 10 disposé entre l'organe de déclenchement 1A de la soupape VF et l'organe de commande C de l'interrupteur IS est prolongé par un appendice 10A qui coopère avec l'appendice 16A d'un petit levier 16 articulé en 18 par rapport au support 14, de manière qu'un brusque soulèvement du petit levier 16 (dans le sens contraire des aiguilles d'une montre par rapport à la figure 1) provoque un déplacement correspondant du petit levier 10 et donc une commande de l'organe de manoeuvre C de l'interrupteur IS, de la même manière que ce qui peut être effectué par l'organe mobile 1A de la soupape fusible VF. Par conséquent, une commande de l'ouverture de l'interrupteur sous charge IS peut être provoquée par la fusion de la soupape fusible VF (et donc par l'actionnement de l'organe de déclenchement 1A) ou par l'action sur le petit levier 16. Cette action sur le petit levier 16 est obtenue par une tige 20 sollicitée élastiquement, qui est déplacée par à-coups vers le haut, en vue du fonctionnement précité, lors d'une surintensité d'ampleur limitée qui provoque l'activation d'une bobine électromagnétique 22 de la manière indiquée ci-après; la tige 20 est réalisée sous la forme d'une crémaillère qui peut être manoeuvrée par un secteur denté 24 solidaire à un petit levier de manoeuvre 24A, en vue de permettre la remise en fonctionnement du dispositif associé à la bobine 22. Le secteur denté 24 et le petit levier 24A sont articulés en 26 par rapport à une bande 28 qui est solidaire du support 14 et en contact avec une colonne de maintien 30 parallèle et disposée à côté de la soupape VF. Cette colonne 30 supporte en partie basse un boîtier 32 destiné à des organes mécaniques de déclenchement indiqués ci-après; le tout est supporté en partie basse par une bague 34 qui constitue une borne de contact pouvant être associée à la pince P3, par l'intermédiaire d'un contact en forme de ruban 36; le tout est supporté de manière isolée par un composant d'isolation 38 qui est monté autour de la borne 3 de la soupape VF; cette borne 3 est en contact, par l'intermédiaire d'un serre-fil 40, avec un conducteur 42, relié à son tour à un serre-fil 43 destiné à la borne 22A de la bobine 22; l'autre borne 22B de la bobine 22 est connectée en 43A et véhicule le courant vers la partie inférieure de la structure en vue de relier, par l'intermédiaire de la bande 34, 36, la partie inférieure de la soupape, jusqu'à ce qu'elle entre en contact avec la pince P3 de support de tout le groupe. La colonne 30, qui est isolante en partie haute, supporte par l'intermédiaire de la bande 44 une plaque 46 isolante, qui supporte la bobine 22 au moyen d'un étrier 48 et du serre-fil 43, ce serre-fil étant supporté par rapport à la bande 44 inférieure. La bobine 22 présente un élément d'ancrage 50 qui peut se déplacer axialement. L'élément 50 est maintenu en partie basse par un système à ressort ou à gravité et peut être soulevé par un extracourant qui circule dans la bobine 22, à une valeur supérieure à une limite d'étalonnage, raison pour laquelle, lorsque l'on est en présence d'un extracourant relativement limité, le soulèvement de l'organe mobile 50 de la bobine 22 est provoqué; ceci provoque le déplacement angulaire d'un petit levier 52 articulé en 54 par rapport à un support en forme de U 53, monté sur la plaque 46 au moyen de l'étrier de maintien 48 de la bobine. Le petit levier 52, qui est commandé par la bobine 22, est articulé par rapport à l'extrémité supérieure d'une tige 58, dont l'extrémité inférieure est articulée par rapport à un petit levier 60 articulé en 62 par rapport à la partie inférieure de la structure du boîtier 32, afin de commander un organe à champignon 66 d'un dispositif de déclenchement. Cet organe 66 provoque le déplacement d'un petit levier qui empêchait l'actionnement de ressorts de pression 80; par conséquent, les ressorts 80 sont libérés et agissent sur le levier 70. Enfin, l'élément 66 agit sur un dispositif de déclenchement désigné globalement par la référence 68, servant à dégager le levier 70 à l'aide d'un pommeau de manoeuvre 70A et d'une branche 70B supérieure, adaptée de façon à agir sur une tige 74 adaptée de façon à commander l'élément de déclenchement 20 de la manière indiquée ci-après; le levier 70 est sollicitée vers le bas, par l'intermédiaire d'une crémaillère 78, par les ressorts 80, de la position de la figure 1 à la position de la figure 2, de façon à provoquer le rappel de la tige 74, lorsque le dispositif 68 est actionné par le champignon 66 afin de dégager le levier 70 de la position d'armement représentée sur la figure 1. La tige 74 (et donc, finalement, le levier 70 qui se déplace par à-coups vers le bas) provoque l'action sur une petite équerre 84 articulée latéralement par rapport au support 28, afin de provoquer, à l'encontre de l'action d'un couple de ressorts 86, le dégagement d'un loquet radial 88 qui débloque le dispositif de déclenchement de la tige 20, adaptée de manière à réaliser conjointement avec le soulèvement par à-coups la commande du levier 16 ou 10 et donc de l'organe C, l'ouverture des interrupteurs sous charge IS. Ce déplacement par à-coups de l'organe 20, permis par le loquet 88, est réalisé à l'aide d'un ressort 90, qui porte contre l'organe 24, 24A. L'ouverture de l'interrupteur IS est donc finalement provoquée par le rappel de l'organe mobile 50 de la bobine 22 sous l'effet de l'extracourant d'ampleur limitée, qui peut passer dans la bobine 22 même dans le cas d'événements non exceptionnels, mais qui doivent toujours provoquer l'ouverture de l'interrupteur IS; cette commande de la bobine 22 est donc effectuée par l'intermédiaire du levier 52, de la tige 58, du petit levier 60, de l'organe à champignon 66, du dispositif de maintien 68 et du levier 70, à l'aide de la transmission 74, 84, 88. Le soulèvement de l'organe 20 est provoqué par le ressort 90 disposé sous ce dernier; ce soulèvement entraîne l'abaissement du petit levier 24A du secteur denté 24, raison pour laquelle, en ce qui concerne tant la saillie de l'organe 20 que l'abaissement du petit levier 24, il est possible de contrôler visuellement le phénomène qui a permis l'ouverture de l'interrupteur sous charge IS. Un autre contrôle visuel est permis par l'éventuelle capacité d'observation de l'organe 1A soulevé sous l'effet de la fusion de la soupape VF dans un cas exceptionnel. Par conséquent, l'ouverture d'un interrupteur sous charge IS peut être contrôlé par l'étude de la position de ces organes 1A, 20, 24A et également 70A par l'opérateur, qui peut ainsi intervenir lorsque le phénomène qui a interrompu l'alimentation agissant sur l'interrupteur IS a été établi par un extracourant d'ampleur limitée et donc sous l'effet de l'action de la bobine 22; il est par conséquent possible, par la simple action sur le levier de manoeuvre 24A et 70A, de rétablir l'alimentation après le contrôle de l'éventuel dommage qui pourrait être vérifié en aval du transformateur commandé par tout le complexe décrit et par l'interrupteur IS.According to what is illustrated in the appended drawing, the references P1 and P3 denote two mounting clamps of the group in question, which are supported by a panel on which is also mounted a switch under load designated by the reference IS, the member of which control for opening is designated by the letter C and must be moved from the position of Figure 1 to the position of Figure 2, in order to obtain the opening of the switch under load IS, the group in issue being described below. The clamps P1 and P2 are in contact with the terminals 1 and 3 of a fuse valve VF with a high current value and with a limited delay in response to the melting and therefore at the opening of the circuit, according to relatively limited current values. ; consequently, the VF fuse valve is capable of interrupting the circuit, and therefore controlling the opening of the IS switch, in the presence of very high supercurrent values in exceptional cases such as lightning or analogous, while in the presence of low supercurrent values, this fuse valve does not act on the (typical) slowness of the fuse blowing, the valve then remaining intact when there are current interruptions caused by the device described below and arranged in series with the valve VF; this device allows a relatively simple and rapid return to operation without replacing the VF valve. In order to ensure direct control by the valve VF, there is provided in a known and conventional manner a movable element 1A which is coaxial with the upper terminal 1 of this valve and causes, under the effect of the melting of the fuse VF, the triggering of an upward movement of a small lever member 10, arranged in an intermediate manner within the movable element 1A of the fuse valve VF, in order to ensure the control of the member C of the IS load switch. The small intermediate lever 10 of this control is articulated at 12 relative to a support 14 which is mounted on the terminal 1. The support 14 comprises (see in particular FIG. 4) two insulating plates, between which the pin 12 extends and the small lever 10; the support plates 14 are supported by a strip 14B by means of small insulating blocks 14A. The small lever 10 disposed between the triggering member 1A of the valve VF and the control member C of the switch IS is extended by an appendage 10A which cooperates with the appendage 16A of a small lever 16 articulated at 18 relative to the support 14, so that a sudden lifting of the small lever 16 (anticlockwise with respect to FIG. 1) causes a corresponding displacement of the small lever 10 and therefore a control of the operating member C of the switch IS, in the same manner as that which can be carried out by the movable member 1A of the fuse valve VF. Consequently, a command to open the switch under load IS can be caused by the melting of the fuse valve VF (and therefore by the actuation of the triggering member 1A) or by the action on the small lever 16. This action on the small lever 16 is obtained by a rod 20 resiliently biased, which is moved jerkily upwards, for the above operation, during an overcurrent of limited magnitude which causes the activation of an electromagnetic coil 22 in the manner indicated below; the rod 20 is produced in the form of a rack which can be maneuvered by a toothed sector 24 secured to a small operating lever 24A, in order to allow the device associated with the coil 22 to be put back into operation. The toothed sector 24 and the small lever 24A are articulated at 26 with respect to a band 28 which is secured to the support 14 and in contact with a holding column 30 parallel and disposed next to the valve VF. This column 30 supports in the lower part a housing 32 intended for mechanical triggering members indicated below; the whole is supported in the lower part by a ring 34 which constitutes a contact terminal which can be associated with the clamp P3, by means of a contact in the form of a strip 36; the whole is supported in isolation by an insulation component 38 which is mounted around the terminal 3 of the valve VF; this terminal 3 is in contact, via a wire clamp 40, with a conductor 42, in turn connected to a wire clamp 43 intended for terminal 22A of the coil 22; the other terminal 22B of the coil 22 is connected at 43A and conveys the current to the lower part of the structure in order to connect, via the strip 34, 36, the lower part of the valve, up to that it comes into contact with the P3 support clamp for the whole group. The column 30, which is insulating at the top, supports via the strip 44 an insulating plate 46, which supports the coil 22 by means of a stirrup 48 and the wire clamp 43, this wire clamp being supported relative to the lower band 44. Coil 22 has an anchoring element 50 which can move axially. The element 50 is held in the lower part by a spring or gravity system and can be lifted by an extra-current which circulates in the coil 22, to a value greater than a calibration limit, which is why, when is in the presence of a relatively limited extra current, the lifting of the movable member 50 of the coil 22 is caused; this causes the angular displacement of a small lever 52 articulated at 54 relative to a U-shaped support 53, mounted on the plate 46 by means of the retaining bracket 48 of the coil. The small lever 52, which is controlled by the coil 22, is articulated relative to the upper end of a rod 58, the lower end of which is articulated relative to a small lever 60 articulated at 62 relative to the part bottom of the housing structure 32, in order to control a mushroom member 66 of a triggering device. This member 66 causes the displacement of a small lever which prevented the actuation of pressure springs 80; consequently, the springs 80 are released and act on the lever 70. Finally, the element 66 acts on a triggering device generally designated by the reference 68, serving to release the lever 70 by means of an operating knob 70A and an upper branch 70B, adapted so as to act on a rod 74 adapted so as to control the trigger element 20 in the manner indicated below; the lever 70 is biased downwards, by means of a rack 78, by the springs 80, from the position of FIG. 1 to the position of FIG. 2, so as to bring about the return of the rod 74, when the device 68 is actuated by the mushroom 66 in order to disengage the lever 70 from the cocking position shown in FIG. 1. The rod 74 (and therefore, finally, the lever 70 which moves jerkily downwards ) causes the action on a small square 84 articulated laterally with respect to the support 28, in order to cause, against the action of a couple of springs 86, the release of a radial latch 88 which releases the device for triggering the rod 20, adapted so to be carried out in conjunction with the jerky lifting of the lever 16 or 10 and therefore of the member C, the opening of the switches under load IS. This jerky movement of the member 20, enabled by the latch 88, is achieved using a spring 90, which bears against the member 24, 24A. The opening of the switch IS is therefore finally caused by the return of the movable member 50 of the coil 22 under the effect of the extra-current of limited magnitude, which can pass into the coil 22 even in the case of 'events not exceptional, but which must always cause the opening of the IS switch; this control of the coil 22 is therefore carried out by means of the lever 52, the rod 58, the small lever 60, the mushroom member 66, the holding device 68 and the lever 70, using the transmission 74, 84, 88. The lifting of the member 20 is caused by the spring 90 disposed under the latter; this lifting causes the small lever 24A to lower the toothed sector 24, which is why, as regards both the projection of the member 20 and the lowering of the small lever 24, it is possible to visually control the phenomenon which has enabled opening of the IS load switch. Another visual control is enabled by the possible observation capacity of the member 1A raised under the effect of the fusion of the valve VF in an exceptional case. Consequently, the opening of a switch under load IS can be controlled by studying the position of these members 1A, 20, 24A and also 70A by the operator, who can thus intervene when the phenomenon which has interrupted the power supply acting on the IS switch has been established by a extra-current of limited magnitude and therefore under the effect of the action of the coil 22; it is therefore possible, by simple action on the operating lever 24A and 70A, to restore the power after checking for any damage which could be verified downstream of the transformer controlled by the entire complex described and by the IS switch.

Un temporisateur, qui est de type mécanique et adapté de façon à retenir le levier 70, pendant un temps prédéterminé, avant son déplacement complet, est associé au levier 70 qui est destiné, par son propre déplacement, à ouvrir le circuit principal en l'absence de fusion du fusible, pour les buts indiqués ci-après. Le groupe temporisateur est globalement désigné par la référence 101 et comprend un train d'engrenages pour l'organe 120 pouvant être chargé manuellement avec un accumulateur élastique. La référence 103 désigne un petit levier servant au chargement du temporisateur; la référence 105 désigne un secteur qui est destiné à dégager le temporisateur afin de le mettre en fonctionnement et la référence 107 désigne un secteur, coaxial par rapport au précédent, qui est actionné par le temporisateur. Ce dernier comprend un disque 109 pourvu d'une pluralité, en particulier quatre, de picots 109A adaptés de façon à venir en contact avec les deux secteurs. Lorsque le secteur 105 dégage le temporisateur, il a démarré l'action du disque à picots 109 sur le secteur 107 et, enfin, une rotation d'un disque denté 112, qui est commandé par le temporisateur 120 appliqué sur l'extérieur du boîtier, est provoquée. Ce disque engrène une crémaillère arquée 114 s'étendant entre deux feuillures 116A, 116B d'un secteur 116, qui est solidaire du bras 70B du levier 70, 70A. Lorsque le levier est soulevé, la crémaillère 114 est entraînée sur la feuillure 116B; lorsque le levier 70, 70A, 70B est dégagé (de la manière décrite ci-dessus, tandis que le dispositif est contenu dans le boîtier 32), ce dernier peut se déplacer par à-coups sur une course limitée qui est permise par le déplacement sur la crémaillère 114, de la feuillure 116B jusqu'à la feuillure 116A, à la suite de quoi a lieu l'effet freinant du temporisateur 120, qui met fin à la course du complexe 70, 74 et donc de celui 16, 10 seulement après un temps prédéterminé, avant d'opérer l'ouverture du circuit, tout en permettant à l'organe 109 de tourner.A timer, which is of the mechanical type and adapted so as to retain the lever 70, for a predetermined time, before its complete movement, is associated with the lever 70 which is intended, by its own movement, to open the main circuit by absence of blown fuse, for the purposes indicated below. The timer group is generally designated by the reference 101 and includes a gear train for the member 120 which can be loaded manually with an elastic accumulator. Reference 103 designates a small lever for loading the timer; the reference 105 designates a sector which is intended to release the timer in order to put it into operation and the reference 107 designates a sector, coaxial with respect to the previous one, which is activated by the timer. The latter comprises a disc 109 provided with a plurality, in particular four, of pins 109A adapted so as to come into contact with the two sectors. When the sector 105 releases the timer, it started the action of the pin disc 109 on the sector 107 and, finally, a rotation of a toothed disc 112, which is controlled by the timer 120 applied to the outside of the housing. , is provoked. This disc meshes with an arcuate rack 114 extending between two rebates 116A, 116B of a sector 116, which is integral with the arm 70B of the lever 70, 70A. When the lever is raised, the rack 114 is driven on the rebate 116B; when the lever 70, 70A, 70B is released (as described above, while the device is contained in the housing 32), the latter can move in spurts over a limited stroke which is allowed by the movement on the rack 114, from the rebate 116B to the rebate 116A, after which a place the braking effect of the timer 120, which ends the race of the complex 70, 74 and therefore that of the 16, 10 only after a predetermined time, before operating the circuit opening, while allowing the organ 109 to turn.

La disposition permet les fonctionnements différents qui sont spécifiés ci-après.The arrangement allows the different operations which are specified below.

La plage d'intensités des courants qui peuvent sortir du transformateur et passer dans la bobine et la soupape est comprise entre 1 à 2 A et 300 à 4000 A, valeur moyenne d'un court-circuit.The intensity range of the currents which can leave the transformer and pass through the coil and the valve is between 1 to 2 A and 300 to 4000 A, the average value of a short circuit.

Si l'on utilise par exemple un fusible de 40 A et de 17,5 Kv, on déduit de la courbe de fusion qu'il fond en la présence d'une intensité de 120A en une durée maximale de 600 secondes. Il existe à présent deux fonctionnements possibles :

  • 1) L'impulsion qu'une bobine a reçu au passage d'un courant de 200A a provoqué le dégagement du levier 70 qui, lors de sa course vers le bas, a été bloqué sous l'action du temporisateur qui lui permet de finir la course et d'actionner le levier 10, 16 après 600 secondes. Cependant, le fusible VF a déjà fondu après 600 secondes et a provoqué par cette fusion l'ouverture du sectionneur sous charge IS. Ce dernier s'est normalement ouvert aux deux phases à courant normal et, lors de la phase pendant laquelle s'est produit le court-circuit, il s'est ouvert sans que le courant n'ait grillé la soupape fusible.
  • 2) L'impulsion que la bobine a reçu au passage d'un courant de 100 A a provoqué le dégagement du levier 70 qui, lors de sa course vers le bas, a été bloqué sous l'effet de l'entrée en action du temporisateur; ce denier a permis au levier 70, après 600 secondes, de finir la course et d'actionner les leviers 10, 16 tout en ouvrant le sectionneur sous charge, ce qui interrompt ainsi le passage du courant de 100 A du fait que la soupape n'a pas fondu.
If, for example, a 40 A and 17.5 Kv fuse is used, it can be deduced from the melting curve that it melts in the presence of an intensity of 120 A in a maximum duration of 600 seconds. There are now two possible operations:
  • 1) The impulse that a coil received at the passage of a current of 200A caused the release of the lever 70 which, during its downward movement, was blocked under the action of the timer which allows it to finish the stroke and actuate lever 10, 16 after 600 seconds. However, the VF fuse has already blown after 600 seconds and caused this opening of the IS load disconnector. The latter normally opened in both phases at normal current and, during the phase during which the short-circuit occurred, it opened without the current having blown the fuse valve.
  • 2) The impulse that the coil received when a current of 100 A passed caused the release of lever 70 which, during its downward stroke, was blocked under the effect of the entry into action of the timer; this last allowed the lever 70, after 600 seconds, to finish the stroke and actuate the levers 10, 16 while opening the disconnector under load, which thus interrupts the passage of the current of 100 A because the valve has not melted.

L'introduction d'un temporisateur entre la bobine et le fusible permet donc de sélectionner la plage des courants qui traversent la bobine et arrivent à la soupape. Après un temps déterminé, si le courant a présenté un ampèrage élevé, ce dernier a grillé la soupape fusible; au contraire, s'il ne fait pas griller la soupape, il présente un ampèrage tel, que la construction du sectionneur sous charge peut s'ouvrir sans risque.The introduction of a timer between the coil and the fuse therefore makes it possible to select the range of currents which pass through the coil and arrive at the valve. After a determined time, if the current had a high amperage, the latter has blown the fuse valve; on the contrary, if it does not cause the valve to burn out, it has such amperage that the construction of the disconnector under load can open without risk.

La bobine peut être construite à l'aide d'un nombre double ou triple de spires, de manière à présenter deux ou trois points d'injection de courant et à être utilisée par exemple pour le passage d'un courant de 10 A, 20 A ou 30 A, tout en pouvant exercer encore la force d'expulsion du tourillon central, le produit A x N tours, c'est-à-dire la valeur en ampères-tours, étant donc constant.The coil can be constructed using a double or triple number of turns, so as to present two or three current injection points and to be used for example for the passage of a current of 10 A, 20 A or 30 A, while still being able to exert the force of expulsion of the central journal, the product A x N turns, that is to say the value in ampere-turns, therefore being constant.

Il est évident que la conception ne constitue qu'un exemple seulement de la mise en oeuvre de l'invention, des modifications de forme et de disposition pouvant être apportées à cette dernière sans toutefois sortir de l'esprit du concept inventif qui caractérise l'invention même.It is obvious that the design constitutes only one example only of the implementation of the invention, modifications of form and arrangement which can be made to the latter without however departing from the spirit of the inventive concept which characterizes the invention itself.

Claims (6)

Groupe de protection à double rupture comprenant, disposées en série, une soupape fusible étalonnée à des valeurs élevées d'extracourant et une bobine électromagnétique étalonnée de façon à agir, à des valeurs d'extracourant plus faibles, sur un dispositif de commande adapté à un réarmement manuel, caractérisé par le fait de pouvoir être associé à un interrupteur sous charge (IS) qui peut être commandé selon l'une des deux manières possibles par l'intermédiaire d'une articulation (10, 16) à double commande, adaptée de façon à agir sur l'organe (C) de commande dudit interrupteur sous charge (IS) au moyen de l'un ou l'autre des deux organes de déclenchement (1A, 20), dont l'un est commandé par la soupape fusible (VF) et l'autre par la bobine électromagnétique (22); un temporisateur (101, 120) étant prévu, permettant l'ouverture du sectionneur sous charge, après l'écoulement du temps de fusion de la soupape (VF).Double-break protection group comprising, arranged in series, a fusible valve calibrated at high supercurrent values and an electromagnetic coil calibrated so as to act, at lower supercurrent values, on a control device adapted to a manual resetting, characterized by the fact that it can be associated with a load switch (IS) which can be controlled in one of two possible ways by means of a double control articulation (10, 16), adapted to so as to act on the control member (C) of said load switch (IS) by means of one or the other of the two trip members (1A, 20), one of which is controlled by the fuse valve (VF) and the other by the electromagnetic coil (22); a timer (101, 120) being provided, allowing the disconnector to open under load, after the time for melting the valve (VF) has elapsed. Soupape de protection à double rupture selon la revendication 1, caractérisée par le fait que ladite articulation (10, 16) est formée par deux petits leviers coopérant entre eux, l'un (10) d'entre eux étant actionné par l'organe de déclenchement (1A) de la soupape fusible (VF) et commandant l'interrupteur sous charge (IS) en vue de l'ouvrir, et l'autre (16) étant actionné par l'organe (20) commandé par la bobine (22) et agissant sur le premier petit levier (10).Double-break protection valve according to claim 1, characterized in that said articulation (10, 16) is formed by two small levers cooperating with each other, one (10) of them being actuated by the tripping (1A) of the fuse valve (VF) and controlling the load switch (IS) in order to open it, and the other (16) being actuated by the member (20) controlled by the coil (22 ) and acting on the first small lever (10). Soupape de protection à double rupture selon la revendication 1 ou 2, caractérisée par le fait qu'un support isolant (14), supportant l'articulation (10, 16) servant à la double commande de l'interrupteur sous charge, est monté à l'aide d'une bande métallique (14B) sur l'une des bornes (1, 3) de la soupape fusible, de laquelle peut faire saillie l'organe de déclenchement (1A) correspondant de cette soupape.Double-break protection valve according to claim 1 or 2, characterized in that an insulating support (14), supporting the articulation (10, 16) serving for the double control of the switch under load, is mounted at using a metal strip (14B) on one of the terminals (1, 3) of the fuse valve, from which the corresponding trigger member (1A) of this valve can protrude. Soupape de protection à double rupture selon la revendication 1, 2 ou 3, caractérisée par le fait que ledit support (14) et un support (34, 36) isolé (en 38), monté sur l'autre (3) des bornes de la soupape fusible (VF), supportent entièrement le groupe composé de la bobine électromagnétique (22) et du système de commande mécanique et de réarmement (24, 86) lui étant associé et destiné à agir sur l'organe de déclenchement (20).Double-break protection valve according to claim 1, 2 or 3, characterized in that said support (14) and an isolated support (34, 36) (at 38), mounted on the other (3) of the terminals the fuse valve (VF), fully support the group consisting of the electromagnetic coil (22) and the mechanical control and reset system (24, 86) being associated with it and intended to act on the triggering member (20). Soupape de protection à double rupture selon au moins l'une des revendications 1 à 4, caractérisée par le fait de comprendre un dispositif retardateur, c'est-à-dire un temporisateur (101, 120), adapté de façon à ralentir le déplacement du levier (70) dû à l'impulsion provoquée par la bobine (22) traversée par le courant; ledit dispositif (101) permettant l'ouverture retardée du sectionneur sous charge, lorsque le fusible n'a pas fondu du fait qu'il a supporté une faible charge de courant, tandis que sous l'effet d'une charge de courant élevée, le fusible a fondu avant l'ouverture du sectionneur sous charge; dans les deux cas, les mécanismes de l'installation étant protégés.Double-break protection valve according to at least one of claims 1 to 4, characterized by comprising a delay device, that is to say a timer (101, 120), adapted so as to slow the movement the lever (70) due to the impulse caused by the coil (22) traversed by the current; said device (101) allowing the delayed opening of the disconnector under load, when the fuse has not blown because it has supported a low current load, while under the effect of a high current load, the fuse has blown before opening the disconnector under load; in both cases, the installation mechanisms being protected. Soupape de protection à double rupture selon au moins l'une des revendications 1 à 5, caractérisée par le fait que la bobine (22) est pourvue d'un plus grand nombre de bornes de connexion en vue de faire varier l'ampèrage tout en conservant la même valeur du produit ampères-tours, selon la borne connectée.Double-break protection valve according to at least one of claims 1 to 5, characterized in that the coil (22) is provided with a greater number of connection terminals in order to vary the amperage while keeping the same value of the ampere-turns product, depending on the connected terminal.
EP94830139A 1993-03-24 1994-03-24 Protection group with double interruption Withdrawn EP0617448A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITFI930060A IT1262048B (en) 1993-03-24 1993-03-24 DOUBLE BREAKING PROTECTION GROUP FOR ELECTRICAL SYSTEMS, WITH FUSE VALVE, ELECTROMAGNETIC COIL AND TIMER.
ITFI930060 1993-03-24

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EP0617448A1 true EP0617448A1 (en) 1994-09-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996037903A1 (en) * 1995-05-24 1996-11-28 Felten & Guilleaume Energietechnik Aktiengesellschaft Combined load-break switch and fuse assembly
WO2006111339A1 (en) * 2005-04-18 2006-10-26 Abb Technology Ag Fuse system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB522303A (en) * 1939-06-08 1940-06-14 Gordon Spencer Marston Improvements in or relating to tripping devices for electric circuit breakers and switches
EP0025022A1 (en) * 1979-09-03 1981-03-11 LA PUNTIMATIC S.n.c. di Musiani Franco &amp; C. Detector device for overcurrents and the loss of one or two phases
GB2067838A (en) * 1980-01-24 1981-07-30 G & W Electric Speciality Co Time delay switch mechanism for automatic circuit breaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB522303A (en) * 1939-06-08 1940-06-14 Gordon Spencer Marston Improvements in or relating to tripping devices for electric circuit breakers and switches
EP0025022A1 (en) * 1979-09-03 1981-03-11 LA PUNTIMATIC S.n.c. di Musiani Franco &amp; C. Detector device for overcurrents and the loss of one or two phases
GB2067838A (en) * 1980-01-24 1981-07-30 G & W Electric Speciality Co Time delay switch mechanism for automatic circuit breaker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996037903A1 (en) * 1995-05-24 1996-11-28 Felten & Guilleaume Energietechnik Aktiengesellschaft Combined load-break switch and fuse assembly
WO2006111339A1 (en) * 2005-04-18 2006-10-26 Abb Technology Ag Fuse system
US8018317B2 (en) 2005-04-18 2011-09-13 Abb Technology Ag Fuse arrangement
CN101164132B (en) * 2005-04-18 2012-05-09 Abb技术有限公司 Fuse system

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ITFI930060A1 (en) 1994-09-24
IT1262048B (en) 1996-06-18

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