EP1084502B1 - Optimised magnetic subassembly - Google Patents

Optimised magnetic subassembly Download PDF

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Publication number
EP1084502B1
EP1084502B1 EP98930816A EP98930816A EP1084502B1 EP 1084502 B1 EP1084502 B1 EP 1084502B1 EP 98930816 A EP98930816 A EP 98930816A EP 98930816 A EP98930816 A EP 98930816A EP 1084502 B1 EP1084502 B1 EP 1084502B1
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EP
European Patent Office
Prior art keywords
coil
assembly
circuit breaker
magnetic sub
electrical apparatus
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EP98930816A
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German (de)
French (fr)
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EP1084502A1 (en
Inventor
Christophe Bournarie
Davy Morian
Thierry Lienhardt
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Hager Electro SAS
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Hager Electro SAS
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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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures

Definitions

  • the present invention relates to a magnetic sub-assembly for modular electrical equipment of the circuit breaker type, as well as a circuit breaker incorporating such a sub-assembly.
  • Document EP 0 335 774 A shows a magnetic sub-assembly according to the preamble of claim 1.
  • Line protection circuit breakers generally include, in a modular housing with plastic shells, a circuit extending between two terminals and including a thermal trip bimetal for the line protection against overloads and, between a terminal and a fixed contact, an electromagnetic tripping or trip device magnetic often combined with these two components to form a magnetic sub-assembly.
  • the magnetic trigger essentially consists of a coil with a mobile core, associated with a striker to ensure, in case of overcurrent, the disjunction by opening a cooperating moving contact with a fixed contact.
  • the trigger more specifically includes an induction coil mounted longitudinally in a cylinder head magnetic, and surrounding said movable core associated with the striker and a fixed core, a return spring arranged between the cores to complement mounting.
  • This spring makes it possible in particular to recall the mobile core in rest position, striker in the inactive position, i.e. away from the mechanical lock allowing the opening of the contacts by tilting of the mobile contact.
  • the cylinder head consists of a sheet of magnetic material surrounding in general the coil to correctly channel the field lines produced, when the coil is traversed by a current.
  • the cylinder head comprises sidewalls facing each other, one of which is provided with the fixed core, and at level at which the other elements of the subset are generally placed magnetic, that is to say one of the terminals of circuit breaker connection and fixed contact.
  • Magnetic sub-assemblies thus assembled in one piece are then arranged in a part of the plastic shell of the housing, at the when the circuit breaker is assembled.
  • these magnetic subsets are essential circuit breakers, and their design is therefore subject to care particular, as well as numerous tests intended to test the validity of recommended solutions.
  • the main function being linked to the existence of brutal overcurrents, some of these tests are of course performed in different short circuit configurations, or at the very least with currents equal to several times the value of the nominal current, for which the performance of the magnetic sub-assembly is measured.
  • the heating of the different parts of the magnetic sub-assembly is also a sensitive parameter, for which current tests nominal or slightly higher are performed, in order to decrease it as much as possible.
  • this optimization must be carried out without change the installation conditions of said magnetic sub-assembly in the shells forming the case of the circuit breaker.
  • the overall size allocated to it in the case remains the same.
  • the optimization object of the invention which allows in particular to circuit breakers meet the standards in force in the United States of America, is also exercised in all possible directions, and concerns both the choice of materials and the shape of the components or manufacturing considerations.
  • the present invention therefore applies to a magnetic sub-assembly a modular electrical device of the circuit breaker type, consisting of a part of an induction coil associated with a movable core with striker and return spring arranged in an insulating sheath, said coil being longitudinally mounted in a cylinder head having two sides in look at each other, the first side being provided with a fixed core in which is, guided the striker, and on the other hand a fixed contact which is connected a first end of the coil and a connection terminal to circuit breaker to which the second end of the coil is connected, characterized in that the side of the cylinder head disposed on the end side of the coil intended to be connected to the fixed contact is sized to be able to be at least partially integrated into the interior volume of the coil in order to absorb possible axial dimensional variations of the latter, the corresponding end of which is oriented so that its attachment to the fixed contact, whose position relative to the cylinder head is fixed, allows make up for the axial clearance of the coil.
  • the coils can have an axial dimensional dispersion which can go up to more than 1mm, while the cylinder head can be manufactured in a much more precise way, made of its very nature, namely a sheet simply folded according to a special geometry.
  • the coil has also been modified as part of the present invention, as will be seen in more detail below, but its minimum number of turns is imposed, to keep the ampere-turns necessary for the breakout force of the contacts.
  • the wire section being particularly important in the ratings of circuit breakers to which preferably applies the invention (50-63 A), and this is not modifiable, a dimensional dispersion during manufacture is almost inevitable.
  • This cylinder head has two sides end at which are fixed respectively a terminal connection and fixed contact, which is in the form of a blade metal on which a patch is attached to the precise place of the contact with the mobile contact.
  • this fixed contact has an extension for its axial attachment to the side of the cylinder head, therefore provided with a hole for accommodate the end of the fixed core, and whose periphery is finally also dimensioned so that it can be partially integrated into the volume inside the coil, near the end of it.
  • the fixed polar core is therefore integrated on the one hand into a side of the cylinder head, and secondly to the fixed contact whose extension in question is coaxial to said flank.
  • This extension also subscribes to the same characteristics that this sidewall, and facilitates the assembly of all the coils from mass production.
  • the end of the coil to be connected to the fixed contact is oriented in a direction substantially parallel to the axis of the coil, and fixed on a lug of the fixed contact located in the immediate vicinity of the patch of contact fitted to said fixed contact, said tab having for this purpose a surface area parallel to said end.
  • the section of the wire electric forming the induction coil is rectangular in appearance, with a radial thickness less than the axial width to increase on the one hand the internal volume enclosed by said coil and on the other hand reduce the length of wire required for the same length of spool.
  • this measure also has a direct consequence on the control of the breakout force of the contacts.
  • the rectangular section of the wire being preserved, the width axial of the wire can be further increased if a decrease is made of thickness of the sheet forming the cylinder head, the external volume of which remains however unchanged.
  • the magnetic sub-assembly with these improvements can however always be located in the same hulls or portion of hulls as his predecessors.
  • the cylinder head has a U-shape, the arm connecting the two end blanks being on the same side of the coil as the fixed contact and connection terminal.
  • This shape allows to achieve a volume of magnetic material constituting a good compromise between those who would lead to the best performance for very high short-circuit currents, and those that are more suitable for lower short-circuit currents.
  • U shape correctly channels magnetic field lines at lower test values (180 A, 300 A) which allows in particular use a lower stiffness spring. It is however very efficient at saturation, and guarantees non-tripping limits above for average currents.
  • the end of the arm connecting the sides of the cylinder head located on the side of the connection terminal has a side notch provided for fixing the second end of the coil to said terminal without that there is contact with the cylinder head.
  • Said end is oriented in a plane perpendicular to the axis so as to exit tangentially from the winding forming said coil.
  • the two ends of the coil are therefore substantially perpendicular to each other, and provided to facilitate their fixing respectively at the connection terminal and the fixed contact, in combination with the particular shape of the cylinder head and these elements.
  • the end of the coil on the terminal side is fixed to a lug extending the upper part of the connection terminal, presenting a surface looking perpendicular to the axis of the spool, the fixing being done at said notch.
  • This configuration allows you to catch a game perpendicular to the longitudinal median plane of the circuit breaker box, if is needed.
  • the end of the coil is oriented axially from way out of the cylinder head at said notch, fixing to the connection terminal outside the volume surrounded by the cylinder head.
  • the cylinder head is also provided in a material which depends in particular choice of spring. So, it is made of copper or steel, the return spring of the nucleus being for example provided with a weaker force in the first case.
  • the core is preferably made of steel, a material more magnetic than brass generally used so far for strong nominal intensities, and which contributes to improving the control of contact separation force.
  • the invention also relates to a circuit breaker characterized in that it includes a magnetic sub-assembly as described above.
  • the central elements of the subset magnetic are the coil (1) and the magnetic yoke (2), the interior of which is the movable core (3), the fixed core (4), the striker (5) and return spring (6), the latter elements being arranged inside an insulating sheath (7).
  • the cylinder head (2) itself has end flanks (8, 9), connected by an axial arm (10) provided with a recess (11) in the vicinity of the sidewall (9), at which takes place the right end (12) of the coil (1).
  • This is tangential in appearance to said coil (1), and substantially perpendicular to the other straight end (13), which develops rather in an axial direction.
  • the sidewall (8) has a shape such that its insertion is possible at inside the volume of the coil (1), as will be shown more in detail below.
  • the fixed contact (15) further comprises a tab (17) providing a surface external looking parallel to the longitudinal axis of the sub-assembly magnetic, on which is fixed the right end (13) of the coil (1).
  • connection terminal (18) which is extended by a tab (19) having a shape surface perpendicular to said longitudinal axis, on which the other is fixed straight end (12) of the coil (1), at the level of the recess or the notch (11).
  • This terminal (18) has a removable wall (20).
  • FIG. 2 is more precise as to the coil (1) / fixed contact (15) connection, while Figure 3 is clearer for the description of the coil (1) / connection terminal (18) link.
  • This attachment zone is very close to the actual electrical contact, which is produced at the level of the patch (16), in particular due to the offset of the fixed contact (15) relative to the longitudinal axis of the sub-assembly magnetic, in this case materialized by the striker (5) guided by the fixed core (4).
  • a configuration of contact between the right end (12) and the tab (19) is formed in a plane substantially perpendicular to the previous one.
  • the fixation takes place in the notch (11) formed in the arm (10) connecting the sides (8, 9) of the cylinder head (2).
  • the coil (1) has approximately three turns of section substantially rectangular, which saves interior volume, to reduce the length of wire necessary for its production, and by consequent to reduce the heating while increasing the surfaces polar cores, and therefore the separation force of the contacts.
  • the sheet metal of the cylinder head (2), and particularly the arm (10), has undergone a reduction in thickness, to allow the external volume to be increased, and consequently from the internal cylindrical orifice of the coil (1).
  • connection terminal (18) has itself increased in thickness along the current path, i.e. at the top, to reduce the heating in this portion of the magnetic sub-assembly.
  • Figure 4 not being in perspective, more accurately renders the proportions, and allows to realize the respective thickness of the terminal (18) and cylinder head (2) sheets.
  • figure 5 is essentially to represent the subset magnetic of the invention when a coil (1) too long is there established. In this case, only the rounded areas in the vicinity of the right end (13) of the coil (1) must be configured so as not to hinder the expansion of the coil (1).

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Electromagnets (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Thin Magnetic Films (AREA)
  • Soft Magnetic Materials (AREA)
  • Magnetic Heads (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Hard Magnetic Materials (AREA)
  • Hall/Mr Elements (AREA)

Abstract

A magnetic sub-assembly for modular electrical equipment of the circuit-breaker type includes a yoke having a leg at least partially integrated inside the inner volume of an induction coil so that a range of axial dimensions of the coil is allowed by the yoke, and one end of the coil is oriented so that its attachment to a fixed contact also allows the range of axial dimensions.

Description

La présente invention concerne un sous-ensemble magnétique pour appareillage électrique modulaire du type disjoncteur, ainsi qu'un disjoncteur incorporant un tel sous-ensemble.The present invention relates to a magnetic sub-assembly for modular electrical equipment of the circuit breaker type, as well as a circuit breaker incorporating such a sub-assembly.

Le document EP 0 335 774 A montre un sous-ensemble magnétique selon le préambule de la revendication 1.Document EP 0 335 774 A shows a magnetic sub-assembly according to the preamble of claim 1.

Les disjoncteurs de protection de ligne comportent généralement, dans un boítier modulaire à coques en plastique, un circuit s'étendant entre deux bornes et comprenant un bilame de déclenchement thermique pour la protection de la ligne contre les surcharges et, entre une borne et un contact fixe, un organe électromagnétique de disjonction ou déclencheur magnétique souvent regroupé avec ces deux composants pour former un sous-ensemble magnétique.Line protection circuit breakers generally include, in a modular housing with plastic shells, a circuit extending between two terminals and including a thermal trip bimetal for the line protection against overloads and, between a terminal and a fixed contact, an electromagnetic tripping or trip device magnetic often combined with these two components to form a magnetic sub-assembly.

Le déclencheur magnétique comprend essentiellement une bobine avec un noyau mobile, associés à un percuteur pour assurer, en cas de surintensité, la disjonction par ouverture d'un contact mobile coopérant avec un contact fixe.The magnetic trigger essentially consists of a coil with a mobile core, associated with a striker to ensure, in case of overcurrent, the disjunction by opening a cooperating moving contact with a fixed contact.

Dans la plupart des cas, le déclencheur comprend plus précisément une bobine à induction montée longitudinalement dans une culasse magnétique, et entourant ledit noyau mobile associé au percuteur et à un noyau fixe, un ressort de rappel disposé entre les noyaux venant compléter le montage. Ce ressort permet notamment de rappeler le noyau mobile en position de repos, percuteur en position inactive, c'est-à-dire à distance de la serrure mécanique permettant l'ouverture des contacts par basculement du contact mobile.In most cases, the trigger more specifically includes an induction coil mounted longitudinally in a cylinder head magnetic, and surrounding said movable core associated with the striker and a fixed core, a return spring arranged between the cores to complement mounting. This spring makes it possible in particular to recall the mobile core in rest position, striker in the inactive position, i.e. away from the mechanical lock allowing the opening of the contacts by tilting of the mobile contact.

La culasse est constituée d'une tôle en matériau magnétique entourant en général la bobine pour canaliser correctement les lignes de champs produites, lorsque la bobine est parcourue par un courant. De part et d'autre de ladite bobine, selon une direction axiale, la culasse comporte des flancs en regard l'un de l'autre, dont l'un est muni du noyau fixe, et au niveau desquels sont en général disposés les autres éléments du sous-ensemble magnétique, c'est-à-dire respectivement une des bornes de connexion du disjoncteur et le contact fixe.The cylinder head consists of a sheet of magnetic material surrounding in general the coil to correctly channel the field lines produced, when the coil is traversed by a current. By hand and other of said coil, in an axial direction, the cylinder head comprises sidewalls facing each other, one of which is provided with the fixed core, and at level at which the other elements of the subset are generally placed magnetic, that is to say one of the terminals of circuit breaker connection and fixed contact.

Les sous-ensembles magnétiques ainsi montés en une seule pièce sont ensuite disposés dans une partie de la coque plastique du boítier, au moment de l'assemblage du disjoncteur. Comme leur fonction le laisse supposer, ces sous-ensembles magnétiques sont des éléments essentiels des disjoncteurs, et leur conception fait par conséquent l'objet d'un soin particulier, ainsi que de nombreux tests destinés à éprouver la validité des solutions préconisées. La fonction principale étant liée à l'existence de surintensités brutales, certains de ces tests sont bien entendu réalisés dans différentes configurations de court-circuits, ou à tout le moins avec des courants égaux à plusieurs fois la valeur du courant nominal, pour lesquels les performances du sous-ensemble magnétique sont mesurées.Magnetic sub-assemblies thus assembled in one piece are then arranged in a part of the plastic shell of the housing, at the when the circuit breaker is assembled. As their function leaves it suppose, these magnetic subsets are essential circuit breakers, and their design is therefore subject to care particular, as well as numerous tests intended to test the validity of recommended solutions. The main function being linked to the existence of brutal overcurrents, some of these tests are of course performed in different short circuit configurations, or at the very least with currents equal to several times the value of the nominal current, for which the performance of the magnetic sub-assembly is measured.

Pendant ces périodes de fonctionnement extrêmes, un des paramètres sur lesquels porte notamment et de manière particulièrement rigoureuse le contrôle est la force d'arrachage des contacts. Le but de ces contrôles, et des ajustements qui en résultent, est d'affiner les conditions de déclenchement de la serrure mécanique par un meilleur contrôle du déclencheur électromagnétique et de la force véhiculée par le percuteur.During these extreme periods of operation, one of the parameters which are particularly and rigorously covered by the control is the breakout force of the contacts. The purpose of these checks, and resulting adjustments, is to refine the conditions of triggering of the mechanical lock by better control of the electromagnetic trigger and the force carried by the striker.

L'échauffement des différentes parties du sous-ensemble magnétique est également un paramètre sensible, pour lequel des test à courant nominal ou légèrement supérieur sont effectués, dans le but de le diminuer autant que possible.The heating of the different parts of the magnetic sub-assembly is also a sensitive parameter, for which current tests nominal or slightly higher are performed, in order to decrease it as much as possible.

Il s'agit également des objectifs principaux de la présente invention, qui vise globalement à optimiser la conception des sous-ensembles magnétiques équipant les disjoncteurs, notamment mais non exclusivement aux fins précitées.These are also the main objectives of the present invention, which aims overall to optimize the design of the sub-assemblies magnetic devices fitted to circuit breakers, in particular but not exclusively for the aforementioned purposes.

Selon un objectif additionnel, cette optimisation doit être réalisée sans changer les conditions d'installation dudit sous-ensemble magnétique dans les coques formant le boítier du disjoncteur. En d'autres termes, l'encombrement global qui lui est alloué dans le boítier reste le même.According to an additional objective, this optimization must be carried out without change the installation conditions of said magnetic sub-assembly in the shells forming the case of the circuit breaker. In other words, the overall size allocated to it in the case remains the same.

L'optimisation objet de l'invention, qui permet notamment aux disjoncteurs de satisfaire aux normes en vigueur aux Etats-Unis d'Amérique, s'exerce de plus dans toutes les directions possibles, et concerne aussi bien le choix des matériaux que la forme des composants ou des considérations de fabrication.The optimization object of the invention, which allows in particular to circuit breakers meet the standards in force in the United States of America, is also exercised in all possible directions, and concerns both the choice of materials and the shape of the components or manufacturing considerations.

La présente invention s'applique donc à un sous-ensemble magnétique d'un appareillage électrique modulaire du type disjoncteur, composé d'une part d'une bobine à induction associée à un noyau mobile avec percuteur et ressort de rappel disposés dans une gaine isolante, ladite bobine étant montée longitudinalement dans une culasse présentant deux flancs en regard l'un de l'autre, le premier flanc étant muni d'un noyau fixe dans lequel est, guidé le percuteur, et d'autre part d'un contact fixe auquel est relié une première extrémité de la bobine et d'une borne de connexion au disjoncteur à laquelle est reliée la seconde extrémité de la bobine, caractérisé en ce que le flanc de la culasse disposé du côté de l'extrémité de la bobine prévue pour être reliée au contact fixe est dimensionné pour pouvoir être au moins partiellement intégré dans le volume intérieur de la bobine afin d'absorber d'éventuelles variations dimensionnelles axiales de celle-ci, dont l'extrémité correspondante est orientée pour que sa fixation au contact fixe, dont la position relativement à la culasse est fixée, permette de rattraper le jeu axial de la bobine.The present invention therefore applies to a magnetic sub-assembly a modular electrical device of the circuit breaker type, consisting of a part of an induction coil associated with a movable core with striker and return spring arranged in an insulating sheath, said coil being longitudinally mounted in a cylinder head having two sides in look at each other, the first side being provided with a fixed core in which is, guided the striker, and on the other hand a fixed contact which is connected a first end of the coil and a connection terminal to circuit breaker to which the second end of the coil is connected, characterized in that the side of the cylinder head disposed on the end side of the coil intended to be connected to the fixed contact is sized to be able to be at least partially integrated into the interior volume of the coil in order to absorb possible axial dimensional variations of the latter, the corresponding end of which is oriented so that its attachment to the fixed contact, whose position relative to the cylinder head is fixed, allows make up for the axial clearance of the coil.

Il s'avère en effet que, à la fabrication, les bobines peuvent présenter une dispersion dimensionnelle axiale qui peut aller jusqu'à plus de 1mm, alors que la culasse est fabricable de manière beaucoup plus précise, du fait de sa nature même, à savoir une tôle simplement pliée suivant une géométrie particulière.It turns out that, during manufacture, the coils can have an axial dimensional dispersion which can go up to more than 1mm, while the cylinder head can be manufactured in a much more precise way, made of its very nature, namely a sheet simply folded according to a special geometry.

La bobine a également fait l'objet de modifications dans le cadre de la présente invention, comme on le verra plus en détail dans la suite, mais son nombre de spires minimal est imposé, pour conserver les ampère-tours nécessaires à la force d'arrachage des contacts. La section du fil étant notamment importante dans les calibres de disjoncteurs auxquels s'applique de préférence l'invention (50-63 A), et ceci n'étant pas modifiable, une dispersion dimensionnelle lors de la fabrication est quasi inévitable.The coil has also been modified as part of the present invention, as will be seen in more detail below, but its minimum number of turns is imposed, to keep the ampere-turns necessary for the breakout force of the contacts. The wire section being particularly important in the ratings of circuit breakers to which preferably applies the invention (50-63 A), and this is not modifiable, a dimensional dispersion during manufacture is almost inevitable.

Pour des raisons d'optimisation de la fabrication, une seule configuration géométrique de culasse est produite, bien entendu dotée du perfectionnement de l'invention. Cette culasse comporte deux flancs d'extrémité au niveau desquels sont respectivement fixés une borne de connexion et le contact fixe, qui se présente sous la forme d'une lame métallique sur laquelle est rapportée une pastille à l'endroit précis du contact avec le contact mobile.For reasons of manufacturing optimization, only one geometrical configuration of cylinder head is produced, of course endowed with improvement of the invention. This cylinder head has two sides end at which are fixed respectively a terminal connection and fixed contact, which is in the form of a blade metal on which a patch is attached to the precise place of the contact with the mobile contact.

Ce contact fixe présente, selon l'invention, un prolongement pour sa fixation axiale au flanc de la culasse, muni par conséquent d'un orifice pour loger l'extrémité du noyau fixe, et dont la périphérie est enfin également dimensionnée de façon à pouvoir être partiellement intégré dans le volume intérieur de la bobine, à proximité de l'extrémité de celle-ci.According to the invention, this fixed contact has an extension for its axial attachment to the side of the cylinder head, therefore provided with a hole for accommodate the end of the fixed core, and whose periphery is finally also dimensioned so that it can be partially integrated into the volume inside the coil, near the end of it.

Le noyau polaire fixe est donc intégré d'une part à un flanc de la culasse, et d'autre part au contact fixe dont le prolongement en question est coaxial audit flanc. Ce prolongement souscrit par ailleurs aux mêmes caractéristiques que ce flanc, et facilite le montage de toutes les bobines issues de la fabrication en série.The fixed polar core is therefore integrated on the one hand into a side of the cylinder head, and secondly to the fixed contact whose extension in question is coaxial to said flank. This extension also subscribes to the same characteristics that this sidewall, and facilitates the assembly of all the coils from mass production.

De plus, l'extrémité de la bobine à relier au contact fixe est orientée suivant une direction sensiblement parallèle à l'axe de la bobine, et fixée sur une patte du contact fixe située à proximité immédiate de la pastille de contact équipant ledit contact fixe, ladite patte présentant à cet effet une surface d'allure parallèle à ladite extrémité. In addition, the end of the coil to be connected to the fixed contact is oriented in a direction substantially parallel to the axis of the coil, and fixed on a lug of the fixed contact located in the immediate vicinity of the patch of contact fitted to said fixed contact, said tab having for this purpose a surface area parallel to said end.

L'orientation de ladite extrémité permet de réaliser la connexion de la même manière quel que soit l'encombrement de la bobine, ce qui représente un nouvel avantage important au niveau de la fabrication.The orientation of said end makes it possible to connect the same way regardless of the size of the coil, which represents a major new manufacturing advantage.

Le fait que cette connexion soit effectuée à proximité immédiate du contact fixe minimise l'échauffement.The fact that this connection is made in the immediate vicinity of the fixed contact minimizes overheating.

Toujours dans l'optique de réduire l'échauffement, la section du fil électrique formant la bobine d'induction est d'allure rectangulaire, avec une épaisseur radiale inférieure à la largeur axiale pour augmenter d'une part le volume intérieur enclos par ladite bobine et diminuer d'autre part la longueur de fil nécessaire pour une même longueur de bobine.Still with the aim of reducing overheating, the section of the wire electric forming the induction coil is rectangular in appearance, with a radial thickness less than the axial width to increase on the one hand the internal volume enclosed by said coil and on the other hand reduce the length of wire required for the same length of spool.

Comme on le verra dans la suite, cette mesure a également une conséquence directe sur le contrôle de la force d'arrachage des contacts.As will be seen below, this measure also has a direct consequence on the control of the breakout force of the contacts.

Selon une configuration améliorant encore l'effet de réduction calorique, la section d'allure rectangulaire du fil étant conservés, la largeur axiale du fil peut encore être augmentée si l'on procède à une diminution d'épaisseur de la tôle formant la culasse, dont le volume externe reste cependant inchangé.According to a configuration further improving the reduction effect caloric, the rectangular section of the wire being preserved, the width axial of the wire can be further increased if a decrease is made of thickness of the sheet forming the cylinder head, the external volume of which remains however unchanged.

Le sous-ensemble magnétique doté de ces améliorations peut toutefois toujours être implanté dans les mêmes coques ou portion de coques que ses devanciers.The magnetic sub-assembly with these improvements can however always be located in the same hulls or portion of hulls as his predecessors.

La conséquence directe de l'augmentation du volume enclos par la bobine est qu'il est corollairement possible d'augmenter la longueur du diamètre des noyaux fixe et mobile, qui sont les pièces polaires générant la force de séparation des contacts.The direct consequence of the increased volume enclosed by the reel is that as a corollary it is possible to increase the length of the diameter of the fixed and mobile cores, which are the pole pieces generating the contact separation force.

D'autre part, selon l'invention, la culasse a une forme en U, le bras reliant les deux flans d'extrémité étant du même côté de la bobine que le contact fixe et la borne de connexion.On the other hand, according to the invention, the cylinder head has a U-shape, the arm connecting the two end blanks being on the same side of the coil as the fixed contact and connection terminal.

Cette forme permet d'aboutir à un volume de matériau magnétique constituant un bon compromis entre ceux qui conduiraient aux meilleures performances pour les courants de court-circuit très élevés, et ceux qui sont plus adaptés aux courants de court-circuit plus faibles.This shape allows to achieve a volume of magnetic material constituting a good compromise between those who would lead to the best performance for very high short-circuit currents, and those that are more suitable for lower short-circuit currents.

Comme mentionné auparavant, des tests sont effectués pour différents courants de court-circuit possibles, allant de valeurs très élevées procurant une saturation complète de la culasse quels que soient sa forme et son matériau, à des valeurs plus basses pour lesquelles ces paramètres ont une importance très grande.As mentioned before, tests are performed for different possible short-circuit currents, ranging from very high values providing complete saturation of the cylinder head whatever its shape and material, at lower values for which these parameters have of great importance.

La forme en U canalise correctement les lignes de champs-magnétique aux valeurs d'essais plus faibles (180 A, 300 A) ce qui permet notamment d'utiliser un ressort de raideur plus faible. Elle est en revanche très performante à la saturation, et garantit les limites de non déclenchement précitées pour les courants moyens.U shape correctly channels magnetic field lines at lower test values (180 A, 300 A) which allows in particular use a lower stiffness spring. It is however very efficient at saturation, and guarantees non-tripping limits above for average currents.

Selon une possibilité, l'extrémité du bras reliant les flancs de la culasse située du côté de la borne de connexion comporte une encoche latérale prévue pour fixer la seconde extrémité de la bobine à ladite borne sans qu'il y ait contact avec la culasse. Ladite extrémité est orientée dans un plan perpendiculaire à l'axe de manière à sortir tangentiellement de l'enroulement formant ladite bobine.According to one possibility, the end of the arm connecting the sides of the cylinder head located on the side of the connection terminal has a side notch provided for fixing the second end of the coil to said terminal without that there is contact with the cylinder head. Said end is oriented in a plane perpendicular to the axis so as to exit tangentially from the winding forming said coil.

Les deux extrémités de la bobine sont donc sensiblement perpendiculaires l'une à l'autre, et prévues pour faciliter leur fixation respectivement à la borne de connexion et au contact fixe, en combinaison avec la forme particulière de la culasse et de ces éléments.The two ends of the coil are therefore substantially perpendicular to each other, and provided to facilitate their fixing respectively at the connection terminal and the fixed contact, in combination with the particular shape of the cylinder head and these elements.

De préférence, l'extrémité de la bobine côté borne est fixée à une patte prolongeant la partie supérieure de la borne de connexion, présentant une surface d'allure perpendiculaire à l'axe de la bobine, la fixation se faisant au niveau de ladite encoche. Cette configuration permet de rattraper un jeu perpendiculaire au plan médian longitudinal du boítier du disjoncteur, s'il en est besoin.Preferably, the end of the coil on the terminal side is fixed to a lug extending the upper part of the connection terminal, presenting a surface looking perpendicular to the axis of the spool, the fixing being done at said notch. This configuration allows you to catch a game perpendicular to the longitudinal median plane of the circuit breaker box, if is needed.

Selon une variante, l'extrémité de la bobine est orientée axialement de manière à sortir de la culasse au niveau de ladite encoche, la fixation à la borne de connexion se faisant à l'extérieur du volume entouré par la culasse.Alternatively, the end of the coil is oriented axially from way out of the cylinder head at said notch, fixing to the connection terminal outside the volume surrounded by the cylinder head.

La culasse est en outre prévue en un matériau qui dépend notamment du choix du ressort. Ainsi, elle est en cuivre ou en acier, le ressort de rappel du noyau étant par exemple prévu avec une force plus faible dans le premier cas. Cette caractéristique souligne à quel point les ajustements effectués sur certains paramètres sont étroitement liés aux possibilités offertes par d'autres paramètres, le but étant toujours d'aboutir au meilleur compromis possible, ce qui exige des essais multiples et variés.The cylinder head is also provided in a material which depends in particular choice of spring. So, it is made of copper or steel, the return spring of the nucleus being for example provided with a weaker force in the first case. This feature highlights how well the adjustments carried out on certain parameters are closely linked to the possibilities offered by other parameters, the goal being always to achieve the best possible compromise, which requires multiple and varied trials.

Selon l'invention, le noyau est de préférence en acier, matériau plus magnétique que le laiton généralement utilisé jusqu'ici pour les fortes intensités nominales, et qui contribue à l'amélioration du contrôle de la force de séparation des contacts.According to the invention, the core is preferably made of steel, a material more magnetic than brass generally used so far for strong nominal intensities, and which contributes to improving the control of contact separation force.

L'invention a aussi pour objet un disjoncteur caractérisé en ce qu'il comprend un sous-ensemble magnétique tel que décrit auparavant.The invention also relates to a circuit breaker characterized in that it includes a magnetic sub-assembly as described above.

L'invention va à présent être décrite plus en détail, en référence aux figures présentées en annexe, pour lesquelles :

  • la figure 1 est une vue en perspective éclatée des différents composants du sous-ensemble magnétique selon l'invention ;
  • les figures 2 et 3 représentent des perspectives de sous-ensemble assemblé vues selon des angles différents ;
  • la figure 4 est une vue en élévation de face dudit sous-ensemble ; et
  • la figure 5 représente un détail agrandi du flanc permettant le débordement de la bobine.
The invention will now be described in more detail, with reference to the figures presented in the appendix, for which:
  • Figure 1 is an exploded perspective view of the various components of the magnetic sub-assembly according to the invention;
  • Figures 2 and 3 show perspectives of assembled subassembly seen from different angles;
  • Figure 4 is a front elevational view of said subassembly; and
  • Figure 5 shows an enlarged detail of the sidewall allowing the coil to overflow.

Dans les différentes figures, les composants sont désignés par les mêmes références. Ainsi, en figure 1, les éléments centraux du sous-ensemble magnétique sont la bobine (1) et la culasse magnétique (2), à l'intérieur desquels se trouvent le noyau mobile (3), le noyau fixe (4), le percuteur (5) et le ressort de rappel (6), ces derniers éléments étant disposés à l'intérieur d'une gaine isolante (7).In the various figures, the components are designated by the same references. Thus, in FIG. 1, the central elements of the subset magnetic are the coil (1) and the magnetic yoke (2), the interior of which is the movable core (3), the fixed core (4), the striker (5) and return spring (6), the latter elements being arranged inside an insulating sheath (7).

La culasse (2) comporte elle-même des flancs d'extrémité (8, 9), reliés par un bras axial (10) muni d'un décrochement (11) au voisinage du flanc (9), au niveau duquel prend place l'extrémité droite (12) de la bobine (1). Celle-ci est d'allure tangentielle à ladite bobine (1), et sensiblement perpendiculaire à l'autre extrémité droite (13), qui se développe plutôt dans une direction axiale.The cylinder head (2) itself has end flanks (8, 9), connected by an axial arm (10) provided with a recess (11) in the vicinity of the sidewall (9), at which takes place the right end (12) of the coil (1). This is tangential in appearance to said coil (1), and substantially perpendicular to the other straight end (13), which develops rather in an axial direction.

Le flanc (8) est doté d'une forme telle que son insertion est possible à l'intérieur du volume de la bobine (1), comme cela sera montré plus en détail dans la suite. Sur sa face externe est placé un prolongement (14) du contact fixe (15) de forme partiellement similaire audit flanc (8), et sur lequel est rapportée une pastille (16) à l'endroit précis du contact avec le contact mobile (non représenté).The sidewall (8) has a shape such that its insertion is possible at inside the volume of the coil (1), as will be shown more in detail below. On its outer face is placed an extension (14) of the fixed contact (15) of partially similar shape to said sidewall (8), and on which a patch (16) is added at the precise point of contact with the contact mobile (not shown).

Le contact fixe (15) comporte en outre une patte (17) offrant une surface externe d'allure parallèle à l'axe longitudinal du sous-ensemble magnétique, sur laquelle se fixe l'extrémité droite (13) de la bobine (1).The fixed contact (15) further comprises a tab (17) providing a surface external looking parallel to the longitudinal axis of the sub-assembly magnetic, on which is fixed the right end (13) of the coil (1).

L'autre flanc (9) est situé à proximité de la borne de connexion (18), laquelle est prolongée par une patte (19) présentant une surface d'allure perpendiculaire audit axe longitudinal, sur laquelle est fixée l'autre extrémité droite (12) de la bobine (1), au niveau du décrochement ou de l'encoche (11). Cette borne (18) présente une paroi amovible (20).The other side (9) is located near the connection terminal (18), which is extended by a tab (19) having a shape surface perpendicular to said longitudinal axis, on which the other is fixed straight end (12) of the coil (1), at the level of the recess or the notch (11). This terminal (18) has a removable wall (20).

Tous ces composants sont assemblés pour donner le sous-ensemble apparaissant aux figures 2 et 3. La figure 2 est plus précise quant à la liaison bobine (1) / contact fixe (15), alors que la figure 3 est plus claire pour la description de la liaison bobine (1) / borne de connexion (18).All these components are assembled to give the sub-assembly appearing in FIGS. 2 and 3. FIG. 2 is more precise as to the coil (1) / fixed contact (15) connection, while Figure 3 is clearer for the description of the coil (1) / connection terminal (18) link.

En référence à la figure 2, la similarité de forme entre le prolongement (14) et le flanc (8) est patente dans la zone terminale de la bobine (1), à proximité de l'extrémité droite (13). Celle-ci est au contact de la patte (17), via une surface de liaison plane qui autorise bien entendu une certaine latitude dans la position relative au moment de la fixation (voir aussi en figure 5).Referring to Figure 2, the similarity of shape between the extension (14) and the sidewall (8) is patent in the end region of the coil (1), near the right end (13). This is in contact with the tab (17), via a flat connection surface which of course allows a certain latitude in the relative position at the time of fixation (see also in figure 5).

Cette zone de fixation est très proche du contact électrique réel, qui se produit au niveau de la pastille (16), notamment du fait du décalage du contact fixe (15) par rapport à l'axe longitudinal du sous-ensemble magnétique, en l'occurrence matérialisé par le percuteur (5) guidé par le noyau fixe (4).This attachment zone is very close to the actual electrical contact, which is produced at the level of the patch (16), in particular due to the offset of the fixed contact (15) relative to the longitudinal axis of the sub-assembly magnetic, in this case materialized by the striker (5) guided by the fixed core (4).

A l'autre extrémité de la bobine (1), une configuration de contact entre l'extrémité droite (12) et la patte (19) est constituée dans un plan sensiblement perpendiculaire au précédent. La fixation a lieu dans l'enchoche (11) pratiquée dans le bras (10) reliant les flancs (8, 9) de la culasse (2).At the other end of the coil (1), a configuration of contact between the right end (12) and the tab (19) is formed in a plane substantially perpendicular to the previous one. The fixation takes place in the notch (11) formed in the arm (10) connecting the sides (8, 9) of the cylinder head (2).

La bobine (1) comporte approximativement trois spires de section sensiblement rectangulaire, ce qui permet de gagner du volume intérieur, de diminuer la longueur de fil nécessaire à sa réalisation, et par conséquent de réduire l'échauffement tout en augmentant les surfaces polaires des noyaux, et donc la force de séparation des contacts.The coil (1) has approximately three turns of section substantially rectangular, which saves interior volume, to reduce the length of wire necessary for its production, and by consequent to reduce the heating while increasing the surfaces polar cores, and therefore the separation force of the contacts.

La tôle de la culasse (2), et particulièrement le bras (10), a subi une réduction en épaisseur, pour permettre l'augmentation du volume externe, et par conséquent de l'orifice cylindrique interne de la bobine (1).The sheet metal of the cylinder head (2), and particularly the arm (10), has undergone a reduction in thickness, to allow the external volume to be increased, and consequently from the internal cylindrical orifice of the coil (1).

L'angle de vue proposé par la figure 3, ainsi que la vue en élévation de la figure 4 laissent apparaítre très clairement d'une part les connexions mécaniques de la bobine (1) et des éléments extérieurs à la culasse (2), et d'autre part la configuration géométrique choisie pour la bobine (1). La borne de connexion (18) a elle-même subi une augmentation d'épaisseur sur le trajet du courant, c'est-à-dire en partie supérieure, afin de réduire l'échauffement dans cette portion du sous-ensemble magnétique.The angle of view proposed by FIG. 3, as well as the elevation view of Figure 4 show very clearly on the one hand the connections mechanics of the coil (1) and of the elements external to the cylinder head (2), and on the other hand the geometric configuration chosen for the coil (1). The connection terminal (18) has itself increased in thickness along the current path, i.e. at the top, to reduce the heating in this portion of the magnetic sub-assembly.

La figure 4, n'étant pas en perspective, rend de manière plus exacte les proportions, et permet de se rendre compte de l'épaisseur respective des tôles de la borne (18) et de la culasse (2).Figure 4, not being in perspective, more accurately renders the proportions, and allows to realize the respective thickness of the terminal (18) and cylinder head (2) sheets.

L'intérêt de la figure 5 est essentiellement de représenter le sous-ensemble magnétique de l'invention lorsqu'une bobine (1) trop longue y est implantée. Dans ce cas, seules les zones arrondies situées au voisinage de l'extrémité droite (13) de la bobine (1) doivent être configurées pour ne pas gêner l'expansion de la bobine (1).The interest of figure 5 is essentially to represent the subset magnetic of the invention when a coil (1) too long is there established. In this case, only the rounded areas in the vicinity of the right end (13) of the coil (1) must be configured so as not to hinder the expansion of the coil (1).

L'exemple décrit en détail dans les lignes précédentes n'a aucune valeur limitative de l'invention, et n'est qu'illustratif. L'invention englobe au contraire toutes les variantes à la portée de l'homme de l'art, et contenues dans le domaine de protection tracé par les revendications annexées.The example described in detail in the previous lines has no limiting value of the invention, and is only illustrative. The invention includes contrary all variants within the reach of ordinary skill in the art, and contained in the field of protection traced by the appended claims.

Claims (13)

  1. Magnetic sub-assembly for circuit breaker type modular electrical apparatus, made up, on the one hand, of an induction coil (1) associated with a moving core (3) with striking pin (5) and return spring (6) which are placed in an insulating sheath (7), said coil being mounted longitudinally in a yolk (2) presenting two sides (8,9) facing each other, the first side being fitted with a fixed core (4) in which the striking pin is guided, and, on the other hand, a fixed contact (15) to which is connected a first end (13) of the coil and a circuit breaker connection terminal (18) to which is connected the second end (12) of the coil, characterised in that the side (8) of the yolk placed at the side of the end (13) of the coil provided to be connected to the fixed contact (15) has dimensions which will allow it to be at least partially integrated into the interior space of the coil in order to absorb possible axial dimensional variations therein, whose corresponding end is orientated so that its fixing to the fixed contact, whose position relative to the yolk is fixed, allows the axial play of the coil to be taken up.
  2. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in claim 1, characterised in that the fixed contact has an extension (14) for its axial fixing to the side of the yolk, provided with a hole to house one end of the fixed core (4) and whose periphery is also dimensioned to allow it to be partially integrated in the interior space of the coil.
  3. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in one of the preceding claims, characterised in that the end (13) of the coil to be connected to the fixed contact is orientated in a direction substantially parallel to the coil's axis, and fixed on a lug (17) of the fixed contact situated in close proximity to the bonding pad (16) equipping said fixed contact, said lug presenting, to this effect, a surface running parallel to said end.
  4. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in any of the preceding claims, characterised in that the cross-section of the electrical wire forming the induction coil (1) is a rectangular shape, with a radial thickness less than the axial width to increase, on the one hand, the interior volume enclosed by said coil and to decrease, on the other hand, the length of wire necessary for a same length of coil.
  5. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in the preceding claim, characterised in that, the rectangular cross-section of the wire being preserved, the axial length of the wire can be further increased if one proceeds to a decrease of the thickness of the sheet metal forming the yolk (2), whose external volume remains unchanged.
  6. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in one of claims 4 and 5, characterised in that the diameters of the moving (3) and fixed (4) cores are increased following the increase in the internal volume of the coil, in such a way that their polar surfaces, which face each other, increase.
  7. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in any of the preceding claims, characterised in that the yolk (2) is U-shaped, the arm linking the two end sides being on the same side of the coil as the fixed contact and the connection terminal.
  8. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in the preceding claim, characterised in that said arm has a lateral slot (11) close to the yolk's side situated at the side of the connection terminal, at the second end of the coil.
  9. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in the preceding claim, characterised in that the end (12) of the coil, orientated on a plane perpendicular to the axis in order to come out tangentially from the winding forming said coil, is fixed to a lug (19) extending the upper part of the connection terminal, presenting a surface extending perpendicular to the coil's axis, fixing being done at said slot.
  10. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in claim 8, characterised in that the end (12) of the coil is orientated axially so as to leave the yolk at the said slot, fixing at the connection's (18) terminal being done at the exterior of the volume enclosed by the yolk.
  11. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in any of the preceding claims, characterised in that the yolk (2) is made of copper or steel, the return spring (6) of the core being provided to have a weaker strength in the first case.
  12. Magnetic sub-assembly for circuit breaker type modular electrical apparatus as claimed in any of the preceding claims, characterised in that the core (3,4) is made of steel.
  13. Circuit breaker characterised in that it comprises a magnetic sub-assembly as claimed in any of claims 1 to 12.
EP98930816A 1998-06-03 1998-06-10 Optimised magnetic subassembly Expired - Lifetime EP1084502B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9807134 1998-06-03
FR9807134A FR2779567B1 (en) 1998-06-03 1998-06-03 OPTIMIZED MAGNETIC SUB-ASSEMBLY
PCT/FR1998/001197 WO1999063564A1 (en) 1998-06-03 1998-06-10 Optimised magnetic subassembly

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EP1084502A1 EP1084502A1 (en) 2001-03-21
EP1084502B1 true EP1084502B1 (en) 2001-10-31

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US (1) US6577217B1 (en)
EP (1) EP1084502B1 (en)
AT (1) ATE208084T1 (en)
AU (1) AU8112098A (en)
DE (1) DE69802309T2 (en)
ES (1) ES2167086T3 (en)
FR (1) FR2779567B1 (en)
WO (1) WO1999063564A1 (en)

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FR2858106B1 (en) * 2003-07-22 2005-09-23 Hager Electro IMPROVED MAGNETIC SUBASSEMBLY AND CIRCUIT BREAKER HAVING SUCH A MAGNETIC SUBASSEMBLY
TWI300575B (en) * 2003-11-18 2008-09-01 Via Tech Inc Coplanar transformer
FR2868596B1 (en) * 2004-04-01 2006-05-26 Schneider Electric Ind Sas MAGNETIC SUBASSEMBLY OF AN ELECTRICAL DEVICE SWITCH
AT509278A1 (en) * 2008-03-20 2011-07-15 Moeller Gebaeudeautomation Gmbh TRIP MODULE FOR A SWITCHGEAR
JP5276523B2 (en) * 2009-06-08 2013-08-28 三菱電機株式会社 Circuit breaker
DE102009033275B4 (en) * 2009-07-09 2011-05-19 Siemens Aktiengesellschaft breakers
FR2962255B1 (en) * 2010-07-02 2012-07-13 Schneider Electric Ind Sas ELECTROMAGNETIC TRIGGER FOR ELECTRICAL DEVICE SWITCH, ELECTRICAL DEVICE SWITCH COMPRISING SUCH A TRIGGER.
DE102011014061B4 (en) * 2011-03-16 2013-11-28 Abb Ag Circuit breaker and method of making a circuit breaker
EP2544207B1 (en) 2011-07-05 2017-03-29 Siemens Aktiengesellschaft Short circuit trigger with optimised coil connection
FR2989512B1 (en) * 2012-04-17 2014-04-25 Schneider Electric Ind Sas CONTROL UNIT FOR CUTTING A LINE IN CASE OF OVERCURRENT IN THIS LINE AND CIRCUIT BREAKER AGAINST OVERCURRENT IN A LINE
CN106783430A (en) * 2016-11-29 2017-05-31 贵州新纳电器有限公司 A kind of oil damper fixed structure of oil damping breaker

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FR2779567B1 (en) 2000-07-13
DE69802309T2 (en) 2002-07-25
WO1999063564A1 (en) 1999-12-09
AU8112098A (en) 1999-12-20
ATE208084T1 (en) 2001-11-15
EP1084502A1 (en) 2001-03-21
US6577217B1 (en) 2003-06-10
ES2167086T3 (en) 2002-05-01
FR2779567A1 (en) 1999-12-10
DE69802309D1 (en) 2001-12-06

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