EP0715327A1 - Device against calibration reduction after adaption of an auxiliary - Google Patents

Device against calibration reduction after adaption of an auxiliary Download PDF

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Publication number
EP0715327A1
EP0715327A1 EP95410119A EP95410119A EP0715327A1 EP 0715327 A1 EP0715327 A1 EP 0715327A1 EP 95410119 A EP95410119 A EP 95410119A EP 95410119 A EP95410119 A EP 95410119A EP 0715327 A1 EP0715327 A1 EP 0715327A1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
thermal
auxiliary
pole
calibration button
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.)
Granted
Application number
EP95410119A
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German (de)
French (fr)
Other versions
EP0715327B1 (en
Inventor
Michel Bonniau
Michel Dell'ova
Didier Lebouc
Jean Caire
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric Industries SAS
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Schneider Electric SE
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Publication date
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Publication of EP0715327A1 publication Critical patent/EP0715327A1/en
Application granted granted Critical
Publication of EP0715327B1 publication Critical patent/EP0715327B1/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism

Definitions

  • the present invention relates to an anti-derating device of a circuit breaker following the adaptation of an auxiliary such as in particular a differential protection device, this circuit breaker being provided with at least one adjusting screw arranged to perform an initial setting d '' a thermal trip device and define the thermal protection of the circuit breaker corresponding to its rating.
  • the thermal overload protection is adjusted at the factory, taking into account the temperature rise of the cables as well as the device's own heat dissipation.
  • This heat dissipation by Joule effect is due to the internal resistances and is evacuated by the external faces in contact with the ambient air as well as by the power cables.
  • an auxiliary such as for example a differential protection device
  • the balance of the thermal exchanges of the circuit breaker is modified due in particular to the reduction in the surfaces of exchange with the ambient air, to the modification local at the outlet and through the auxiliary of the conductor sections, of the heat dissipation specific to the auxiliary and of the limitation of the evacuation by the power cables. Because of these changes in balance, the circuit breaker trips earlier in overload and must normally be downgraded in size to continue to provide the protection provided.
  • the present invention proposes to solve this problem in a simple and effective manner, either automatically or manually.
  • the anti-derating device is characterized in that it comprises means arranged to perform a new setting of the thermal trigger during the adaptation of the auxiliary.
  • said means for performing the new setting of the thermal trip device are manual.
  • they preferably include a thermal calibration button mounted on each pole of the circuit breaker.
  • said means arranged to perform the new setting of the thermal trip device are automatic.
  • they preferably comprise at least one actuator integral with the auxiliary and arranged to act on an adjustment bar of the thermal trip device of the circuit breaker.
  • an auxiliary 10 such as for example a differential protection device, seen from the side, is provided to be fitted to a circuit breaker 11 also shown seen from the side.
  • the auxiliary is equipped with an actuator 12 arranged to act automatically on a receiving member 13, this receiving member being designed to automatically reset the thermal trip device on each of the poles of the circuit breaker, during the adaptation of the auxiliary to the circuit breaker.
  • the actuator 12 is constituted by an apparent protuberance on a lateral face of the auxiliary and the receiving member 13 is constituted by a bar for adjusting the thermal trip device, the end of this bar being disposed opposite a window 14 formed in a lateral face of the circuit breaker, in correspondence with said protuberance constituting the actuator 12.
  • FIG. 2 illustrates, seen in section, a multipole circuit breaker 11 intended to receive an auxiliary 10 equipped with an actuator 12.
  • the electrical coupling is carried out by means of conductors 15 which extend laterally at the base of the auxiliary and which have bent branches allowing connection to the poles of the circuit breaker.
  • the thermal trip device 16 comprises bimetallic strips 16a, 16b, 16c and 16d respectively associated with each of the poles of the circuit breaker.
  • the receiving member 13 is constituted by an adjustment bar 17 at two levels defined by the presence of bosses 17a, 17b, 17c and 17d having a cam function to act on the position of the bimetallic strips 16a, 16b, 16c and 16d.
  • the bimetallic strips In the initial state corresponding to use of the circuit breaker without an auxiliary, the bimetallic strips occupy a first position, called the low position. In the final state, corresponding to a use of the circuit breaker after adaptation of the auxiliary, the bimetallic strips occupy a second position, called the high position, defined by the bosses 17a, 17b, 17c and 17d.
  • This second position takes into account the new distribution of heat exchanges due to the addition of the auxiliary. It is obtained by a displacement of the adjustment bar 17, in the direction of arrow A, generated by the thrust exerted by the actuator 12 which enters a window 14 identical to that defined with reference to FIG. 1 and is supported on the end of this bar.
  • This bar also comprises a support stop 18 of a return spring 19. When the adjustment bar moves from the first to the second position, the spring is compressed. In the event of withdrawal of the auxiliary, the adjustment bar can return to its first position under the action of the return spring 19. In this case, the bimetallic strips resume their so
  • all the bosses 17a, 17b, 17c and 17d have the same dimensions and in particular the same height.
  • the new setting of the bimetallic strips when adding an auxiliary is the same for all the poles of the circuit breaker.
  • the adjustment bar 27 in this case includes bosses 27a, 27b, 27c and 27d which have an increasing height from left to right in the figure.
  • the new setting of the bimetallic strips 16a, 16b, 16c and 16d is carried out as a function of their distance from the face of the circuit breaker 11 adjacent to the auxiliary 10.
  • the auxiliary is provided with an actuator 12 which engages in a window 14 arranged in the lateral side of the circuit breaker, opposite the end of the adjustment bar 27.
  • FIG. 4 illustrates an embodiment according to which it acts on the base or the foot of the bimetallic strips.
  • a bimetallic strip 30 is mounted on a base 31 which comprises a U-shaped element 32, one branch 32a of which carries an adjusting screw 33 and the other branch 32b of which is linked to the straight active blade 34 of the bimetallic strip.
  • the central part of the U-shaped element 32 is mounted on a support 35 pivoting on a fixed axis 36 secured to the circuit breaker.
  • a branch 37, integral with this support is, on the one hand resting on the adjustment bar 38 and, on the other hand pushed against this bar by a spiral spring 39.
  • the initial adjustment of the setting of the bimetallic strip is carried out at means of the adjusting screw 33 which is engaged in two nuts 40 and 41 arranged on either side of the branch 32a of the U-shaped element 32.
  • the end of this screw bears against the other branch 32b of this element.
  • Wedging consists of spreading the two branches appropriately. It makes it possible to adjust the spacing x of the end of the active blade 34 relative to a connecting rod 42 for triggering in the event of overheating.
  • the action of the adjustment bar 38 consists in acting on the initial spacing x by rotating the base of the bimetal strip on the axis 36.
  • FIG. 5 illustrates another operating mode according to which the bar acts directly on a trigger rod 50 in the event of overheating and no longer on the bimetallic strip.
  • the active blade 51 of the bimetallic strip is secured to an angled base 52.
  • An adjustment screw 53 makes it possible to adjust the initial spacing x 2 of the end of the active blade relative to the rod 50, by modifying the angle of the elbow formed by the bent base 52, one branch of which is secured to the circuit breaker housing and the other branch of which is free.
  • the adjustment bar 54 acts on the position of the link 50. In the absence of an auxiliary, this link occupies a position shown in solid lines, and the distance between the active blade and the link is x 2 .
  • FIG. 6 illustrates an embodiment in which the circuit breaker 11 can be associated with two auxiliaries 10a and 10b which each comprise an actuator, respectively 12a and 12b.
  • the circuit breaker must include two adjustment bars whose effects combine to ensure a new setting of the bimetallic strips taking into account the new conditions of equilibrium of the heat dissipation due to the addition of auxiliaries.
  • a two-pole circuit breaker 60 is equipped, in a manner known per se, with adjustment screws 61.
  • the adjustment can be carried out in the factory, or at the end of production, or at the assembly center and delivery, or at the official distributor according to the rules which are known and supplied by the manufacturer.
  • the action of the screw is mainly, but not exclusively, on the base or foot of the bimetallic strip.
  • the adjustment screw is of the hollow head type and includes a cavity 62 arranged to receive a manual thermal calibration button 63 represented by FIGS. 8A and 8B.
  • the button 63 is provided with a protuberance 64 having a grooved surface which corresponds in size and shape to the cavity 62 of the adjustment screw 61, so that this button can be adapted on this adjustment screw.
  • the front part 65 of the button has a mark, for example an arrow 66 (see FIG. 8A), which occupies an initial position, such as for example represented by FIG. 8A in the absence of an auxiliary and a final position obtained by example by rotating the button a quarter of a turn, as shown in FIG. 9A, when an auxiliary 67 has been adapted to the circuit breaker 60.
  • a card 68 shown in broken lines, can be adapted over the thermal calibration button, to completely hide it and prevent unauthorized use of this button.
  • This cover is mounted at the end of the cavity provided in each pole of the circuit breaker and which allows access to the adjustment screw 61 and to the thermal calibration button 63.
  • this thermal calibration button could be separated from the adjustment screw. In this case, it acts on the bimetallic strip in a zone different from the deformation zone on which the adjusting screw acts.
  • the calibration button can act either on its active straight branch or on a trigger rod as described with reference to FIG. 5, the position of which is modified by means said button.

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Oscillators With Electromechanical Resonators (AREA)

Abstract

The thermal trip device of the multipole circuit-breaker (11) requires readjustment after the introduction of an auxiliary device such as a differential protection device (10) with an actuator (12) aligned with a receiver (13). Electrical coupling is provided by conductors (15) extending laterally from the base of the auxiliary with elbowed branches for connection to the circuit-breaker poles. Automatic readjustment is effected by a bar (17) with a return spring (19) and raised portions (17a-17d) which impinge upon the bimetallic strips (16a-16d) of the separate poles.

Description

La présente invention concerne un dispositif anti-déclassement d'un disjoncteur suite à l'adaptation d'un auxiliaire tel que notamment un dispositif de protection différentielle, ce disjoncteur étant pourvu d'au moins une vis de réglage agencée pour effectuer un calage initial d'un déclencheur thermique et définir la protection thermique du disjoncteur correspondant à son calibre.The present invention relates to an anti-derating device of a circuit breaker following the adaptation of an auxiliary such as in particular a differential protection device, this circuit breaker being provided with at least one adjusting screw arranged to perform an initial setting d '' a thermal trip device and define the thermal protection of the circuit breaker corresponding to its rating.

Dans un disjoncteur, la protection thermique contre les surcharges est réglée en usine en tenant compte des échauffements des câbles ainsi que de la propre dissipation thermique de l'appareil.In a circuit breaker, the thermal overload protection is adjusted at the factory, taking into account the temperature rise of the cables as well as the device's own heat dissipation.

Cette dissipation thermique par effet Joule est due aux résistances internes et s'évacue par les faces extérieures en contact avec l'air ambiant ainsi que par les câbles d'alimentation. Lors de l'adaptation d'un auxiliaire, tel que par exemple un dispositif de protection différentielle, l'équilibre des échanges thermiques du disjoncteur est modifié en raison notamment de la réduction des surfaces d'échange avec l'air ambiant, de la modification locale en sortie et à travers l'auxiliaire des sections des conducteurs, de la dissipation thermique propre à l'auxiliaire et de la limitation de l'évacuation par les câbles d'alimentation. En raison de ces modifications d'équilibre, le disjoncteur déclenche plus tôt en surcharge et doit normalement être déclassé en calibre pour continuer à assurer la protection prévue.This heat dissipation by Joule effect is due to the internal resistances and is evacuated by the external faces in contact with the ambient air as well as by the power cables. During the adaptation of an auxiliary, such as for example a differential protection device, the balance of the thermal exchanges of the circuit breaker is modified due in particular to the reduction in the surfaces of exchange with the ambient air, to the modification local at the outlet and through the auxiliary of the conductor sections, of the heat dissipation specific to the auxiliary and of the limitation of the evacuation by the power cables. Because of these changes in balance, the circuit breaker trips earlier in overload and must normally be downgraded in size to continue to provide the protection provided.

Diverses solutions permettent d'atténuer ce phénomène, par exemple le grossissement des sections de conducteurs de l'auxiliaire, la réalisation d'ouïes de ventilation, la mise en place d'écrans thermiques. Ces solutions ne sont cependant pas complètement satisfaisantes, notamment sur les appareils de fort calibre.Various solutions make it possible to attenuate this phenomenon, for example the enlargement of the sections of conductors of the auxiliary, the realization of gills of ventilation, the installation of thermal screens. These solutions are not, however, completely satisfactory, in particular on heavy gauge devices.

La présente invention se propose de résoudre ce problème d'une manière simple et efficace, soit de manière automatique, soit de manière manuelle.The present invention proposes to solve this problem in a simple and effective manner, either automatically or manually.

A cet effet, le dispositif anti-déclassement selon l'invention est caractérisé en ce que qu'il comprend des moyens agencés pour effectuer un nouveau calage du déclencheur thermique lors de l'adaptation de l'auxiliaire.To this end, the anti-derating device according to the invention is characterized in that it comprises means arranged to perform a new setting of the thermal trigger during the adaptation of the auxiliary.

Selon un premier mode de réalisation, lesdits moyens pour effectuer le nouveau calage du déclencheur thermique sont manuels.According to a first embodiment, said means for performing the new setting of the thermal trip device are manual.

Dans ce cas, ils comportent de préférence un bouton de calibrage thermique monté sur chaque pôle du disjoncteur.In this case, they preferably include a thermal calibration button mounted on each pole of the circuit breaker.

Selon un second mode de réalisation, lesdits moyens agencés pour effectuer le nouveau calage du déclencheur thermique sont automatiques.According to a second embodiment, said means arranged to perform the new setting of the thermal trip device are automatic.

Dans ce cas, ils comprennent de préférence au moins un actionneur solidaire de l'auxiliaire et agencé pour agir sur un barreau d'ajustage du déclencheur thermique du disjoncteur.In this case, they preferably comprise at least one actuator integral with the auxiliary and arranged to act on an adjustment bar of the thermal trip device of the circuit breaker.

La présente invention et ses principaux avantages seront mieux compris en référence à la description d'une forme de réalisation préférée et aux dessins annexés donnés à titre d'exemple non limitatifs dans lesquels :

  • la figure 1 est une vue schématique illustrant les faces latérales d'un disjoncteur et d'un auxiliaire pourvus du dispositif selon l'invention,
  • la figure 2 représente une vue schématique d'une première forme de réalisation du dispositif selon l'invention,
  • la figure 3 représente une vue schématique d'une deuxième forme de réalisation du dispositif selon l'invention,
  • la figure 4 représente une vue détaillée illustrant un premier mode de fonctionnement du dispositif de l'invention,
  • la figure 5 représente une vue détaillée illustrant un deuxième mode de fonctionnement du dispositif de l'invention,
  • la figure 6 est une vue schématique illustrant un disjoncteur associé à deux auxiliaires,
  • les figures 7A et 7B représentent un disjoncteur classique équipé de vis de réglage du déclencheur thermique,
  • les figures 8A et 8B illustrent le disjoncteur précédent équipé de boutons de calibrage thermique et les boutons qui constituent le dispositif selon l'invention dans une première position antérieurement à l'adjonction de l'auxiliaire, et
  • les figures 9A et 9B illustrent le disjoncteur précédent équipé de boutons de calibrage thermique et les boutons qui constituent le dispositif selon l'invention dans une deuxième position antérieurement à l'adjonction de l'auxiliaire.
The present invention and its main advantages will be better understood with reference to the description of a preferred embodiment and to the accompanying drawings given by way of non-limiting example in which:
  • FIG. 1 is a schematic view illustrating the lateral faces of a circuit breaker and of an auxiliary provided with the device according to the invention,
  • FIG. 2 represents a schematic view of a first embodiment of the device according to the invention,
  • FIG. 3 represents a schematic view of a second embodiment of the device according to the invention,
  • FIG. 4 represents a detailed view illustrating a first mode of operation of the device of the invention,
  • FIG. 5 represents a detailed view illustrating a second mode of operation of the device of the invention,
  • FIG. 6 is a schematic view illustrating a circuit breaker associated with two auxiliaries,
  • FIGS. 7A and 7B represent a conventional circuit breaker fitted with screws for adjusting the thermal trip device,
  • FIGS. 8A and 8B illustrate the previous circuit breaker fitted with thermal calibration buttons and the buttons which constitute the device according to the invention in a first position prior to the addition of the auxiliary, and
  • Figures 9A and 9B illustrate the previous circuit breaker equipped with thermal calibration buttons and the buttons which constitute the device according to the invention in a second position prior to the addition of the auxiliary.

En référence à la figure 1, un auxiliaire 10 tel que par exemple un dispositif de protection différentielle, vu de côté, est prévu pour être adapté sur un disjoncteur 11 également représenté vu de côté. L'auxiliaire est équipé d'un actionneur 12 agencé pour agir automatiquement sur un organe récepteur 13, cet organe récepteur étant conçu pour effectuer automatiquement un nouveau calage du déclencheur thermique sur chacun des pôles du disjoncteur, lors de l'adaptation de l'auxiliaire au disjoncteur. L'actionneur 12 est constitué par une protubérance apparente sur une face latérale de l'auxiliaire et l'organe récepteur 13 est constitué par un barreau d'ajustage du déclencheur thermique, l'extrémité de ce barreau étant disposée en regard d'une fenêtre 14 ménagée dans une face latérale du disjoncteur, en correspondance avec ladite protubérance constituant l'actionneur 12.Referring to Figure 1, an auxiliary 10 such as for example a differential protection device, seen from the side, is provided to be fitted to a circuit breaker 11 also shown seen from the side. The auxiliary is equipped with an actuator 12 arranged to act automatically on a receiving member 13, this receiving member being designed to automatically reset the thermal trip device on each of the poles of the circuit breaker, during the adaptation of the auxiliary to the circuit breaker. The actuator 12 is constituted by an apparent protuberance on a lateral face of the auxiliary and the receiving member 13 is constituted by a bar for adjusting the thermal trip device, the end of this bar being disposed opposite a window 14 formed in a lateral face of the circuit breaker, in correspondence with said protuberance constituting the actuator 12.

La figure 2 illustre, vu en coupe, un disjoncteur multipolaire 11 destiné à recevoir un auxiliaire 10 équipé d'un actionneur 12. Le couplage électrique s'effectue au moyen de conducteurs 15 qui s'étendent latéralement à la base de l'auxiliaire et qui présentent des branches coudées permettant le raccordement aux pôles du disjoncteur. Le déclencheur thermique 16 comporte des bilames 16a, 16b, 16c et 16d associés respectivement à chacun des pôles du disjoncteur. L'organe récepteur 13 est constitué par un barreau d'ajustage 17 à deux niveaux définis par la présence de bossages 17a, 17b, 17c et 17d ayant une fonction de cames pour agir sur la position des bilames 16a, 16b, 16c et 16d. Dans l'état initial correspondant à une utilisation du disjoncteur sans auxiliaire, les bilames occupent une première position, dite position basse. Dans l'état final, correspondant à une utilisation du disjoncteur après adaptation de l'auxiliaire, les bilames occupent une seconde position, dite position haute, définie par les bossages 17a, 17b, 17c et 17d. Cette seconde position tient compte de la nouvelle répartition des échanges thermiques due à l'adjonction de l'auxiliaire. Elle est obtenue par un déplacement du barreau d'ajustage 17, dans le sens de la flèche A, engendré par la poussée exercée par l'actionneur 12 qui pénètre dans une fenêtre 14 identique à celle définie en référence à la figure 1 et prend appui sur l'extrémité de ce barreau. Ce barreau comporte par ailleurs une butée d'appui 18 d'un ressort de rappel 19. Lors du déplacement du barreau d'ajustage de la première vers la seconde position, le ressort est comprimé. En cas de retrait de l'auxiliaire, le barreau d'ajustage peut revenir dans sa première position sous l'action du ressort de rappel 19. Dans ce cas, les bilames reprennent leur position dite basse.FIG. 2 illustrates, seen in section, a multipole circuit breaker 11 intended to receive an auxiliary 10 equipped with an actuator 12. The electrical coupling is carried out by means of conductors 15 which extend laterally at the base of the auxiliary and which have bent branches allowing connection to the poles of the circuit breaker. The thermal trip device 16 comprises bimetallic strips 16a, 16b, 16c and 16d respectively associated with each of the poles of the circuit breaker. The receiving member 13 is constituted by an adjustment bar 17 at two levels defined by the presence of bosses 17a, 17b, 17c and 17d having a cam function to act on the position of the bimetallic strips 16a, 16b, 16c and 16d. In the initial state corresponding to use of the circuit breaker without an auxiliary, the bimetallic strips occupy a first position, called the low position. In the final state, corresponding to a use of the circuit breaker after adaptation of the auxiliary, the bimetallic strips occupy a second position, called the high position, defined by the bosses 17a, 17b, 17c and 17d. This second position takes into account the new distribution of heat exchanges due to the addition of the auxiliary. It is obtained by a displacement of the adjustment bar 17, in the direction of arrow A, generated by the thrust exerted by the actuator 12 which enters a window 14 identical to that defined with reference to FIG. 1 and is supported on the end of this bar. This bar also comprises a support stop 18 of a return spring 19. When the adjustment bar moves from the first to the second position, the spring is compressed. In the event of withdrawal of the auxiliary, the adjustment bar can return to its first position under the action of the return spring 19. In this case, the bimetallic strips resume their so-called low position.

Dans cette réalisation, tous les bossages 17a, 17b, 17c et 17d ont les mêmes dimensions et notamment la même hauteur. De ce fait, le nouveau calage des bilames lors de l'adjonction d'un auxiliaire est le même pour tous les pôles du disjoncteur.In this embodiment, all the bosses 17a, 17b, 17c and 17d have the same dimensions and in particular the same height. As a result, the new setting of the bimetallic strips when adding an auxiliary is the same for all the poles of the circuit breaker.

On admet dans ce cas que l'incidence de l'adjonction d'un auxiliaire est la même pour tous les pôles. Dans la pratique, l'équilibre des échanges thermiques dus à l'adjonction d'un auxiliaire est différent d'un pôle à l'autre. En effet, si l'auxiliaire est monté d'un côté du différentiel, le pôle le plus proche est le plus fortement perturbé. La perturbation s'atténue à mesure que les pôles s'éloignent de la paroi du disjoncteur accolée à l'auxiliaire. Une variante de la réalisation précédente, illustrée par le figure 3, tient compte de ce fait. Le barreau d'ajustage 27 comporte dans ce cas des bossages 27a, 27b, 27c et 27d qui ont une hauteur croissante de gauche à droite sur la figure. De cette manière, le nouveau calage des bilames 16a, 16b, 16c et 16d est effectué en fonction de leur éloignement de la face du disjoncteur 11 adjacente à l'auxiliaire 10. Comme précédemment, l'auxiliaire est pourvu d'un actionneur 12 qui s'engage dans une fenêtre 14 aménagée dans le côté latéral du disjoncteur, en regard de l'extrémité du barreau d'ajustage 27. Par cette réalisation, on obtient un étagement progressif du nouveau calage des bilames.It is assumed in this case that the incidence of the addition of an auxiliary is the same for all the poles. In practice, the balance of heat exchanges due to the addition of an auxiliary differs from one pole to another. Indeed, if the auxiliary is mounted on one side of the differential, the nearest pole is the most strongly disturbed. The disturbance diminishes as the poles move away from the wall of the circuit breaker attached to the auxiliary. A variant of the previous embodiment, illustrated in Figure 3, takes this fact into account. The adjustment bar 27 in this case includes bosses 27a, 27b, 27c and 27d which have an increasing height from left to right in the figure. In this way, the new setting of the bimetallic strips 16a, 16b, 16c and 16d is carried out as a function of their distance from the face of the circuit breaker 11 adjacent to the auxiliary 10. As previously, the auxiliary is provided with an actuator 12 which engages in a window 14 arranged in the lateral side of the circuit breaker, opposite the end of the adjustment bar 27. By this embodiment, a gradual staging of the new setting of the bimetallic strips is obtained.

L'action du barreau d'ajustage sur les bilames peut se faire de différentes manières. La figure 4 illustre un mode de réalisation selon lequel il agit sur la base ou le pied des bilames. Un bilame 30 est monté sur une base 31 qui comporte un élément 32 en forme de U dont une branche 32a porte une vis de réglage 33 et dont l'autre branche 32b est liée à la lame active rectiligne 34 du bilame. La partie centrale de l'élément 32 en forme de U est montée sur un support 35 pivotant sur un axe fixe 36 solidaire du disjoncteur. Une branche 37, solidaire de ce support est, d'une part en appui sur le barreau d'ajustage 38 et, d'autre part poussée contre ce barreau par un ressort spiral 39. Le réglage initial du calage du bilame s'effectue au moyen de la vis de réglage 33 qui est engagée dans deux écrous 40 et 41 disposés de part et d'autre de la branche 32a de l'élément 32 en forme de U. L'extrémité de cette vis prend appui contre l'autre branche 32b de cet élément. Le calage consiste à écarter les deux branches de manière appropriée. Il permet de régler l'écartement x de l'extrémité de la lame active 34 par rapport à une biellette 42 de déclenchement en cas de surchauffe. L'action du barreau d'ajustage 38 consiste à agir sur l'écartement initial x en faisant pivoter la base du bilame sur l'axe 36.The action of the adjustment bar on the bimetallic strips can be done in different ways. FIG. 4 illustrates an embodiment according to which it acts on the base or the foot of the bimetallic strips. A bimetallic strip 30 is mounted on a base 31 which comprises a U-shaped element 32, one branch 32a of which carries an adjusting screw 33 and the other branch 32b of which is linked to the straight active blade 34 of the bimetallic strip. The central part of the U-shaped element 32 is mounted on a support 35 pivoting on a fixed axis 36 secured to the circuit breaker. A branch 37, integral with this support is, on the one hand resting on the adjustment bar 38 and, on the other hand pushed against this bar by a spiral spring 39. The initial adjustment of the setting of the bimetallic strip is carried out at means of the adjusting screw 33 which is engaged in two nuts 40 and 41 arranged on either side of the branch 32a of the U-shaped element 32. The end of this screw bears against the other branch 32b of this element. Wedging consists of spreading the two branches appropriately. It makes it possible to adjust the spacing x of the end of the active blade 34 relative to a connecting rod 42 for triggering in the event of overheating. The action of the adjustment bar 38 consists in acting on the initial spacing x by rotating the base of the bimetal strip on the axis 36.

La figure 5 illustre un autre mode de fonctionnement selon lequel le barreau agit directement sur une biellette 50 de déclenchement en cas de surchauffe et non plus sur le bilame. Dans cette construction, la lame active 51 du bilame est solidaire d'une base coudée 52. Une vis de réglage 53 permet de régler l'écartement initial x 2 de l'extrémité de la lame active par rapport à la biellette 50, en modifiant l'angle du coude formé par la base coudée 52 dont une branche est solidaire du boîtier du disjoncteur et l'autre branche est libre. Le barreau d'ajustage 54 agit sur la position de la biellette 50. En l'absence d'auxiliaire, cette biellette occupe une position représentée en traits pleins, et l'écartement entre la lame active et la biellette est x 2. Lors de la mise en place d'un auxiliaire, le barreau d'ajustage est poussé et un bossage 55, identique à ceux décrits en référence aux figures 2 et 3, a pour effet de déplacer la biellette 50 dans une position représentée en traits interrompus. Dans cette position, l'écartement entre cette biellette et la lame active est modifiée et portée à la valeur x 1.FIG. 5 illustrates another operating mode according to which the bar acts directly on a trigger rod 50 in the event of overheating and no longer on the bimetallic strip. In this construction, the active blade 51 of the bimetallic strip is secured to an angled base 52. An adjustment screw 53 makes it possible to adjust the initial spacing x 2 of the end of the active blade relative to the rod 50, by modifying the angle of the elbow formed by the bent base 52, one branch of which is secured to the circuit breaker housing and the other branch of which is free. The adjustment bar 54 acts on the position of the link 50. In the absence of an auxiliary, this link occupies a position shown in solid lines, and the distance between the active blade and the link is x 2 . When setting up an auxiliary, the adjustment bar is pushed and a boss 55, identical to those described with reference to FIGS. 2 and 3, has the effect of displacing the rod 50 in a position shown in broken lines . In this position, the spacing between this link and the active blade is modified and brought to the value x 1 .

La figure 6 illustre un mode de réalisation dans lequel le disjoncteur 11 peut être associé à deux auxiliaires 10a et 10b qui comportent chacun un actionneur, respectivement 12a et 12b. Dans une telle construction, le disjoncteur doit comporter deux barreaux d'ajustage dont les effets se conjuguent pour assurer un nouveau calage des bilames en tenant compte des nouvelles conditions d'équilibre de la dissipation thermique dues à l'adjonction des auxiliaires.FIG. 6 illustrates an embodiment in which the circuit breaker 11 can be associated with two auxiliaries 10a and 10b which each comprise an actuator, respectively 12a and 12b. In such a construction, the circuit breaker must include two adjustment bars whose effects combine to ensure a new setting of the bimetallic strips taking into account the new conditions of equilibrium of the heat dissipation due to the addition of auxiliaries.

Toutes ces réalisations correspondent à un nouveau calage des bilames, qui s'effectue automatiquement au moment où un opérateur associe au disjoncteur un ou deux auxiliaires adaptés sur les faces latérales de ce disjoncteur. Cet automatisme est dû à l'interaction du ou des déclencheurs sur le ou les barreaux d'ajustage. D'autres réalisations permettent d'obtenir le même effet de façon manuelle.All these achievements correspond to a new setting of the bimetallic strips, which takes place automatically at the moment when an operator associates with the circuit breaker one or two auxiliaries adapted on the side faces of this circuit breaker. This automatism is due to the interaction of the trigger (s) on the adjustment bar (s). Other embodiments make it possible to obtain the same effect manually.

Différents modes de réalisation sont prévus à cet effet. Comme le montrent les figures 7A et 7B, un disjoncteur bipolaire 60 est équipé, d'une manière connue en soi, de vis de réglage 61. Le réglage peut s'effectuer en usine, ou en fin de production, ou au centre de regroupement et de livraison, ou chez le distributeur officiel selon les règles qui sont connues et fournies par le fabricant. L'action de la vis se fait principalement, mais non exclusivement, sur la base ou pied du bilame. La vis de réglage est du type à tête creuse et comporte une cavité 62 agencée pour recevoir un bouton de calibrage thermique manuel 63 représenté par les figures 8A et 8B. Le bouton 63 est pourvu d'une protubérance 64 ayant une surface cannelée qui correspond en dimension et en forme à la cavité 62 de la vis de réglage 61, de telle manière que ce bouton puisse être adapté sur cette vis de réglage. La partie frontale 65 du bouton comporte un repère, par exemple une flèche 66 (voir figure 8A), qui occupe une position initiale, telle que par exemple représentée par la figure 8A en l'absence d'un auxiliaire et une position finale obtenue par exemple par rotation du bouton d'un quart de tour, comme le montre la figure 9A, lorsqu'un auxiliaire 67 a été adapté au disjoncteur 60.Different embodiments are provided for this purpose. As shown in FIGS. 7A and 7B, a two-pole circuit breaker 60 is equipped, in a manner known per se, with adjustment screws 61. The adjustment can be carried out in the factory, or at the end of production, or at the assembly center and delivery, or at the official distributor according to the rules which are known and supplied by the manufacturer. The action of the screw is mainly, but not exclusively, on the base or foot of the bimetallic strip. The adjustment screw is of the hollow head type and includes a cavity 62 arranged to receive a manual thermal calibration button 63 represented by FIGS. 8A and 8B. The button 63 is provided with a protuberance 64 having a grooved surface which corresponds in size and shape to the cavity 62 of the adjustment screw 61, so that this button can be adapted on this adjustment screw. The front part 65 of the button has a mark, for example an arrow 66 (see FIG. 8A), which occupies an initial position, such as for example represented by FIG. 8A in the absence of an auxiliary and a final position obtained by example by rotating the button a quarter of a turn, as shown in FIG. 9A, when an auxiliary 67 has been adapted to the circuit breaker 60.

Dans un souci d'inviolabilité de l'ensemble une carte 68, représentée en traits interrompus, peut être adaptée par-dessus le bouton de calibrage thermique, pour le masquer totalement et empêcher une utilisation non autorisée de ce bouton. Ce cache est monté à l'extrémité de la cavité ménagée dans chaque pôle du disjoncteur et qui permet l'accès à la vis de réglage 61 et au bouton de calibrage thermique 63.In the interests of inviolability of the assembly, a card 68, shown in broken lines, can be adapted over the thermal calibration button, to completely hide it and prevent unauthorized use of this button. This cover is mounted at the end of the cavity provided in each pole of the circuit breaker and which allows access to the adjustment screw 61 and to the thermal calibration button 63.

Il est bien entendu que ce bouton de calibrage thermique pourrait être dissocié de la vis de réglage. Dans ce cas, il agit sur le bilame dans une zone différente de la zone de déformation sur laquelle agit la vis de réglage.It is understood that this thermal calibration button could be separated from the adjustment screw. In this case, it acts on the bimetallic strip in a zone different from the deformation zone on which the adjusting screw acts.

Par exemple, si la vis de réglage agit sur le pied du bilame, le bouton de calibrage peut agir soit sur sa branche active rectiligne soit sur une biellette de déclenchement telle que décrite en référence à la figure 5, dont on modifie la position au moyen dudit bouton.For example, if the adjusting screw acts on the foot of the bimetal strip, the calibration button can act either on its active straight branch or on a trigger rod as described with reference to FIG. 5, the position of which is modified by means said button.

Claims (18)

Dispositif anti-déclassement d'un disjoncteur suite à l'adaptation d'un auxiliaire tel que notamment un dispositif de protection différentielle, ce disjoncteur étant pourvu d'au moins une vis de réglage agencée pour effectuer un calage initial d'un déclencheur thermique et définir la protection thermique du disjoncteur (11, 60) correspondant à son calibre, caractérisé en ce que qu'il comprend des moyens agencés pour effectuer un nouveau calage du déclencheur thermique lors de l'adaptation de l'auxiliaire (10, 67).Anti-derating device of a circuit breaker following the adaptation of an auxiliary such as in particular a differential protection device, this circuit breaker being provided with at least one adjusting screw arranged to carry out an initial setting of a thermal trip device and define the thermal protection of the circuit breaker (11, 60) corresponding to its rating, characterized in that it comprises means arranged to perform a new setting of the thermal trip device during the adaptation of the auxiliary (10, 67). Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens (63) agencés pour effectuer le nouveau calage du déclencheur thermique sont manuels.Device according to claim 1, characterized in that said means (63) arranged to perform the new setting of the thermal trip device are manual. Dispositif selon la revendication 2, caractérisé en ce que lesdits moyens manuels comportent un bouton de calibrage (63) thermique monté sur chaque pôle du disjoncteur, ce bouton étant agencé pour agir sur le fonctionnement d'un élément constitutif dudit déclencheur thermique pour chaque pôle du disjoncteur (60).Device according to claim 2, characterized in that said manual means comprise a thermal calibration button (63) mounted on each pole of the circuit breaker, this button being arranged to act on the operation of a component of said thermal trip device for each pole of the circuit breaker (60). Dispositif selon la revendication 3, caractérisé en ce que ledit bouton de calibrage (63) thermique est agencé pour agir sur un bilame pour chaque pôle du disjoncteur (60).Device according to claim 3, characterized in that said thermal calibration button (63) is arranged to act on a bimetallic strip for each pole of the circuit breaker (60). Dispositif selon la revendication 3, caractérisé en ce que ledit bouton de calibrage (63) thermique est agencé pour agir sur une biellette d'un mécanisme de déclenchement associé à un bilame pour chaque pôle du disjoncteur (60).Device according to claim 3, characterized in that said thermal calibration button (63) is arranged to act on a link of a tripping mechanism associated with a bimetallic strip for each pole of the circuit breaker (60). Dispositif selon la revendication 3, caractérisé en ce que le bouton de calibrage (63) thermique est monté dans une première position correspondant audit calage initial du déclencheur thermique et peut être amené dans une seconde position correspondant audit nouveau calage de ce déclencheur thermique.Device according to claim 3, characterized in that the thermal calibration button (63) is mounted in a first position corresponding to said initial setting of the thermal trip device and can be brought into a second position corresponding to said new setting of this thermal trip device. Dispositif selon la revendication 6, caractérisé en ce que ledit bouton de calibrage thermique est rotatif, son déplacement de la première à la seconde position correspondant à une rotation angulaire déterminée.Device according to claim 6, characterized in that said thermal calibration button is rotatable, its displacement from the first to the second position corresponding to a determined angular rotation. Dispositif selon la revendication 3, caractérisé en ce que ledit bouton de calibrage (63) thermique est disposé dans un logement ménagé sur une face du disjoncteur.Device according to claim 3, characterized in that said thermal calibration button (63) is disposed in a housing provided on one face of the circuit breaker. Dispositif selon la revendication 8, caractérisé en ce que ledit logement est pourvu d'un cache (68) agencé pour masquer le bouton de calibrage thermique et pour le rendre inviolable.Device according to claim 8, characterized in that said housing is provided with a cover (68) arranged to hide the thermal calibration button and to make it tamper-proof. Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens agencés pour effectuer le nouveau calage du déclencheur thermique sont automatiques.Device according to claim 1, characterized in that said means arranged to perform the new setting of the thermal release are automatic. Dispositif selon la revendication 10, caractérisé en ce que lesdits moyens automatiques comprennent au moins un actionneur (12, 12a, 12b) solidaire de l'auxiliaire et agencé pour effectuer ledit nouveau calage du déclencheur thermique en agissant sur un organe récepteur (13) solidaire du disjoncteur.Device according to claim 10, characterized in that said automatic means comprise at least one actuator (12, 12a, 12b) secured to the auxiliary and arranged to effect said new setting of the thermal trigger by acting on a receiving member (13) secured of the circuit breaker. Dispositif selon la revendication 11, caractérisé en ce que ledit actionneur (12, 12a, 12b) est constitué par une protubérance apparente sur un flanc latéral de l'auxiliaire.Device according to claim 11, characterized in that said actuator (12, 12a, 12b) is constituted by an apparent protuberance on a lateral flank of the auxiliary. Dispositif selon la revendication 11, caractérisé en ce que ledit organe récepteur (13) est constitué par un barreau d'ajustage (17) du déclencheur thermique, dont une extrémité est disposée en regard d'une fenêtre (14) ménagée dans une face latérale du disjoncteur en correspondance avec ledit actionneur.Device according to claim 11, characterized in that said receiving member (13) is constituted by an adjustment bar (17) of the thermal trip device, one end of which is arranged opposite a window (14) formed in a lateral face of the circuit breaker in correspondence with said actuator. Dispositif selon la revendication 13, caractérisé en ce que ledit barreau d'ajustage (17) comporte des bossages (17a, 17b, 17c, 17d; 27a, 27b, 27c, 27d) agencés pour coopérer à la manière de cames sur la position d'un composant du déclencheur thermique correspondant à chaque pôle du disjoncteur.Device according to Claim 13, characterized in that the said adjustment bar (17) comprises bosses (17a, 17b, 17c, 17d; 27a, 27b, 27c, 27d) arranged to cooperate in the manner of cams in the position d '' a component of the thermal release corresponding to each pole of the circuit breaker. Dispositif selon la revendication 14, caractérisé en ce que les bossages (17a, 17b, 17c, 17d; 27a, 27b, 27c, 27d) du barreau d'ajustage (17) sont agencés pour agir respectivement sur des bilames (16a, 16b, 16c, 16d) du déclencheur thermique de chaque pôle du disjoncteur.Device according to claim 14, characterized in that the bosses (17a, 17b, 17c, 17d; 27a, 27b, 27c, 27d) of the adjustment bar (17) are arranged to act respectively on bimetallic strips (16a, 16b, 16c, 16d) of the thermal release of each pole of the circuit breaker. Dispositif selon la revendication 14, caractérisé en ce que les bossages (17a, 17b, 17c, 17d; 27a, 27b, 27c, 27d) du barreau d'ajustage (17) sont agencés pour agir respectivement sur une biellette (42, 50) d'un mécanisme de déclenchement associé à un bilame pour chaque pôle du disjoncteur.Device according to claim 14, characterized in that the bosses (17a, 17b, 17c, 17d; 27a, 27b, 27c, 27d) of the adjustment bar (17) are arranged to act respectively on a link (42, 50) a tripping mechanism associated with a bimetallic strip for each pole of the circuit breaker. Dispositif selon la revendication 14, caractérisé en ce que lesdits bossages (17a, 17b, 17c, 17d) ont des hauteurs égales.Device according to claim 14, characterized in that said bosses (17a, 17b, 17c, 17d) have equal heights. Dispositif selon la revendication 14, caractérisé en ce que lesdits bossages (27a, 27b, 27c, 27d) ont des hauteurs différentes.Device according to claim 14, characterized in that said bosses (27a, 27b, 27c, 27d) have different heights.
EP95410119A 1994-11-28 1995-10-16 Device against calibration reduction after adaption of an auxiliary Expired - Lifetime EP0715327B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9414477 1994-11-28
FR9414477A FR2727567B1 (en) 1994-11-28 1994-11-28 ANTI-DEGRADING DEVICE IN CALIBRATION OF A CIRCUIT BREAKER FOLLOWING THE ADAPTATION OF AN AUXILIARY

Publications (2)

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EP0715327A1 true EP0715327A1 (en) 1996-06-05
EP0715327B1 EP0715327B1 (en) 2001-06-13

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EP95410119A Expired - Lifetime EP0715327B1 (en) 1994-11-28 1995-10-16 Device against calibration reduction after adaption of an auxiliary

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EP (1) EP0715327B1 (en)
CN (1) CN1055175C (en)
AT (1) ATE202238T1 (en)
AU (1) AU691989B2 (en)
DE (1) DE69521273D1 (en)
FR (1) FR2727567B1 (en)
RU (1) RU2107354C1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831120A (en) * 1973-11-08 1974-08-20 Gen Electric Trip unit having improved trip adjustment indicator and circuit breaker incorporating same
US3950717A (en) * 1975-02-21 1976-04-13 Westinghouse Electric Corporation Multi-pole circuit breaker with adjustable thermal trip unit
US4148004A (en) * 1977-05-04 1979-04-03 Westinghouse Electric Corp. Circuit breaker with calibrating means
EP0338250A2 (en) * 1988-04-19 1989-10-25 ABL SURSUM BAYERISCHE ELEKTROZUBEHÖR GmbH & Co. KG Multiphase circuit breaker
EP0375488A1 (en) * 1988-12-23 1990-06-27 Hager Electro S.A. Housing for modular electrical devices with a closing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3831120A (en) * 1973-11-08 1974-08-20 Gen Electric Trip unit having improved trip adjustment indicator and circuit breaker incorporating same
US3950717A (en) * 1975-02-21 1976-04-13 Westinghouse Electric Corporation Multi-pole circuit breaker with adjustable thermal trip unit
US4148004A (en) * 1977-05-04 1979-04-03 Westinghouse Electric Corp. Circuit breaker with calibrating means
EP0338250A2 (en) * 1988-04-19 1989-10-25 ABL SURSUM BAYERISCHE ELEKTROZUBEHÖR GmbH & Co. KG Multiphase circuit breaker
EP0375488A1 (en) * 1988-12-23 1990-06-27 Hager Electro S.A. Housing for modular electrical devices with a closing device

Also Published As

Publication number Publication date
RU2107354C1 (en) 1998-03-20
FR2727567B1 (en) 1997-01-03
DE69521273D1 (en) 2001-07-19
FR2727567A1 (en) 1996-05-31
AU3907095A (en) 1996-06-06
CN1055175C (en) 2000-08-02
CN1131804A (en) 1996-09-25
EP0715327B1 (en) 2001-06-13
AU691989B2 (en) 1998-05-28
ATE202238T1 (en) 2001-06-15

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