EP0782757A1 - Power limiting device for electric installation - Google Patents

Power limiting device for electric installation

Info

Publication number
EP0782757A1
EP0782757A1 EP95932038A EP95932038A EP0782757A1 EP 0782757 A1 EP0782757 A1 EP 0782757A1 EP 95932038 A EP95932038 A EP 95932038A EP 95932038 A EP95932038 A EP 95932038A EP 0782757 A1 EP0782757 A1 EP 0782757A1
Authority
EP
European Patent Office
Prior art keywords
current
installation
limiting device
threshold value
connection
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
EP95932038A
Other languages
German (de)
French (fr)
Other versions
EP0782757B1 (en
Inventor
Yves Maucherat
Louis Sieberras
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.)
Electricite de France SA
Original Assignee
Electricite de France SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Electricite de France SA filed Critical Electricite de France SA
Publication of EP0782757A1 publication Critical patent/EP0782757A1/en
Application granted granted Critical
Publication of EP0782757B1 publication Critical patent/EP0782757B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/10—Adaptation for built-in fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H81/00—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
    • H01H81/02—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting electrothermally operated

Definitions

  • the present invention relates to a power limiting device intended to limit the power delivered to an electrical installation.
  • Such a device makes it possible to disconnect the electrical installation situated downstream thereof as soon as a predetermined intensity threshold is reached.
  • Such a power limiting circuit breaker is easy to use because it can be reset by the customer after having tripped, but has the drawback of requiring complex assembly.
  • a fuse is very easy to mount, but has the drawback of causing a definitive cut-off of the power supply if the current threshold is exceeded.
  • the present invention aims to overcome the aforementioned drawbacks by proposing a power limiting device making it possible to limit the consumption of an electrical installation and to protect this installation against large and sudden increases in current.
  • a power limiting device for electrical installation characteristic laughed at in that it comprises, mounted in series in a common box between two connection terminals of this box to said installation, first current limiting means, resettable automatically, adapted to intervene when the intensity of the supply current of said installation reaches a first threshold value corresponding to the maximum value of the intensity of the current authorized to circulate in said installation and of second means of breaking the current, not resettable, having a response time less than that of the first current limiting means and adapted to intervene when the instantaneous value of the supply current reaches a second threshold value greater than said first threshold value.
  • the first current limiting means comprise a thermal resistance switch.
  • the switch comprises, in an envelope of insulating material, a movable contact, a fixed contact and an actuating member in heat exchange relation with the thermal resistance and cooperating with the movable contact so as to move it between a closed current flow position in which the movable contact rests on the fixed contact and an open current limiting position.
  • the movable contact and the fixed contact respectively comprise a conductive strip and a contact tab, each fixed by one of their ends on a support and bearing on one another in the closed position by their free end, and the actuating member comprises a snap action bimetal fixed at its median zone on a lug formed on the suppor.
  • the switch has first and second pins made of conductive material sant one end of the envelope and being respectively extended inside the envelope by the conductive blade and by the contact tab, the second pin being folded from said end to an opposite end of the envelope and comprising a mechanical connection and electrical connection member with the second current cut-off means, the first pin passing through an orifice formed in a connection terminal of the housing with the installation.
  • the second current cutoff means comprise a fuse provided with two connection end pieces, one of its end pieces being connected to the mechanical connection and electrical connection member of the interrupter, the other end piece passing through an orifice. formed in a connection terminal of the box with the installation.
  • FIG. 1 is an exploded perspective view of a power limiting device according to the invention
  • FIG. 2 is a sectional view of the first current limiting means of the device shown in Figure 1, in the closed current flow position;
  • FIG. 3 shows a sectional view of the first current limiting means of the device shown in Figure 1, in the open current limiting position.
  • a power limiting device according to the invention is shown, designated by the general reference 10.
  • the power limiting device 10 is intended to be installed on the power supply network. upstream of an electrical installation, such as an electrical installation of a dwelling, so as to limit the power supplied to it.
  • This device 10 includes first current limiting means 12 and second current cutting means 14.
  • the first current limiting means 12 and the second current breaking means 14 are arranged in series and placed in a common housing 16, fictitiously broken in this FIG. 1, preferably having dimensions identical to those of a conventional fuse.
  • the housing 16 comprises a cylindrical body 18, made of ceramic, surrounding the first means 12 for limiting the current and the second means 14 for cutting the current.
  • the cylindrical body 18 is provided at each of its ends with two connection terminals 20 and 22 of the housing 16 with the installation, connected respectively to the first means 12 of current limitation and to the second means 14 of current cut.
  • the terminals 20 and 22 are crimped hot on the body 18 of the housing 16.
  • each connection terminal 20 and 22 of the housing 16 is provided with an axial orifice, respectively 24 and 26, formed in its end wall.
  • the first current limiting means 12 comprise a substantially parallelepipedic envelope 28 made of insulating material, such as a plastic material, in which a switch is disposed, which will be described with reference to FIGS. 2 and 3.
  • the envelope 28 is provided on one of its ends 30 with first and second pins 32, 34 made of conductive material passing through the casing 28 and each connected to the switch.
  • the free end of the first pin 32 of the first current limiting means 12 passes through the orifice 24 of the connection terminal 20 of the housing 16, and is welded to the external face 36 of this terminal 20 so as to make an electrical connection between this terminal 20 and the switch.
  • the free end of the second pin 34 is folded back and extends from the end 30 of the casing 28 towards an opposite end 38, shown in dotted lines, at the level of which this pin 34 comprises a mechanical connection member and electrical connection consisting of a cylindrical socket 40 intended to cooperate with the second means 14 of current cut.
  • the second current cutting means 14 comprise a fuse constituted in a known manner by an alloy wire, not shown, enclosed in a cylindrical ceramic cartridge 42 and the ends of which are connected to two connection ends 44 and 46, made of material conductor, closing each end of the cartridge 42.
  • the fuse constituting the second current breaking means is a fuse whose breaking capacity is above 20,000 amperes and whose nominal current is between 5 and 20 amperes, preferably 10 amperes.
  • connection end piece 44 passes through the orifice 26, of the connection terminal 22 of the housing 16 so as to make an electrical connection between this terminal 22 of the housing l ⁇ and the fuse.
  • the first means 12 comprise a current limiting tor interrup ⁇ , bearing the general reference 48.
  • the switch 48 includes a movable contact constituted by a blade conduc ⁇ trice 50, a fixed contact, constituted by a contact tab 52 and an actuating member constituted by a snap action bimetal 54, fixed on a support 56.
  • This switch 48 is arranged in the casing 28, such so that the conductive strip 50 and the bimetallic strip 54 are in heat exchange relationship.
  • the conductive strip 50 of substantially rectilinear shape, is constituted by a thermal resistance. It is fixed by one of its ends to the first pin 32 and to the support 56 by means of a copper rivet 58. The other end of the conductive blade 50 carries a contact pad and cooperates with a free end of the contact lug 52, the other end of which is fixed to the second pin 34 and to the support 56 by means of a second copper rivet 60.
  • the second pin 34 has a folded part 62 extending by a rectilinear part 64 and by the socket 40 for receiving the connection end piece 46 of the fuse 14.
  • the support 56 comprises a lug 66 on which the bimetallic strip 54 is fixed by means of its middle part.
  • the bimetallic strip 54 has an elongated shape of a substantially concave wire, the concavity of which faces the support 56 in the closed current flow position (FIG. 2), and the concavity of which faces the conductive strip 50 in the open position of current limitation ( Figure 3), in which the two ends 68 and 70 of the bimetallic strip 54 cooperate respectively with two projections 72 and 74 provided on the face of the conductive blade 50 placed opposite the bimetallic strip 54 so as to spread the free end of this blade 50 of the contact tab 52 by deformation of the blade 50.
  • the thermal resistance constituting the conductive strip 50 and the material constituting the bimetal strip 54 are chosen so that the cut-off intensity of the switch 48 is substantially between 3.5 and 8 amps, of preferably 5 amps, so to limit the power supplied to approximately 1000 watts.
  • the power limiting device 10 described above is arranged upstream of the electrical installation of a dwelling in place of a conventional fuse, preferably at a location not accessible by the customer.
  • the current supplied by the network therefore flows in the first current limiting means 12 and in the second current cutting means 14.
  • the current flows in the switch 48 and in particular in the conductive strip 50, constituted by the thermal resistance, which heats up. Due to the heat exchange relationship between the blade 50 and the bimetallic strip 54, the heat energy emitted by the thermi ⁇ resistance that is transmitted to the bimetallic strip 54.
  • the switch 48 suddenly passes from its closed current flow position to its open current interruption position under the effect of the sudden change in concavity of the bimetallic strip 54.
  • the concavity of the bimetallic strip 54 is turned towards the blade 50 and the ends 68 and 70 of the bimetallic strip 54 repel the projections 72 and 74 of the blade 50. Consequently, the blade 50 is deformed and its free end deviates from the contact tab 52 ce which causes a power outage.
  • the bimetallic strip 54 After a second response time due to the time required for the thermal resistance and the bimetallic strip 54 cool, the bimetallic strip 54 returns to its initial position and its ends 68 and 70 move away from the blade 50 which then returns to its initial position. The current therefore again flows through the device and the power supply to the electrical installation is again ensured, the free end of the conductive strip 50 resting on the contact tab 52.
  • the response times required respectively for the transition from the closed position to the open position and from the open position to the closed position are determined by appropriately choosing the materials constituting the thermal resistance and the bimetallic strip.
  • the response times for opening and closing are equal and are approximately 1 minute.
  • the fuse constituting the second current cutoff means 14 preserves in a known manner a very low response time and less than that of the switch 48.
  • the alloy wire contained in the cartridge 42 is broken before the switch 48 opens due to the response time thereof, which causes a power cut, and makes it possible to protect the installation connected downstream and upstream of the device.
  • the device which has been described therefore makes it possible to limit the power supplied to an electrical installation to a predetermined threshold value, while allowing this threshold to be exceeded for a very short time, but protecting this installation against short-circuits .
  • this device is very easy to assemble and can therefore easily be installed at a customer, in the event that the latter has not paid his energy bills, replacing a conventional fuse, or be easily replaced by a conventional fuse after the customer has paid their debts.
  • the box in which the first current limiting means and the second current breaking means are enclosed may comprise a body in the shape of a rectangular parallelepiped provided at each of its end faces with a knife. electrical contact. This is also how the threshold values can be modified according to the desired power limitation and protection.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Fuses (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Thermally Actuated Switches (AREA)
  • Crushing And Grinding (AREA)

Abstract

The power limiting device for an electric installation comprises, mounted in series in a common casing (16) between two terminals (20, 22) or connecting said casing (16) to an installation, first current limiting means (12) which are self-resetable and adapted to function when the intensity of the power current of this installation reaches a first threshold value corresponding to the maximum value of the current intensity authorized to circulate in said installation and second current switch-off means (14), which are not self-resetable, and having a response time shorter than that of the first current limiting means (12) and adapted to function when the instantaneous value of the power current reaches a second threshold value higher than the first threshold value.

Description

Dispositif de limitation de puissance pour installation électrique Power limitation device for electrical installation
La présente invention se rapporte à un disposi¬ tif de limitation de puissance destiné à limiter la puissance délivrée à une installation électrique.The present invention relates to a power limiting device intended to limit the power delivered to an electrical installation.
Un tel dispositif permet de déconnecter l'ins- tallation électrique située en aval de celui-ci dès qu'un seuil d'intensité prédéterminé est atteint.Such a device makes it possible to disconnect the electrical installation situated downstream thereof as soon as a predetermined intensity threshold is reached.
Il existe dans l'état de la technique divers types de dispositifs adaptés pour limiter la puissance fournie à une installation électrique. De tels dispositifs permettent par exemple de proposer à un client une solution alternative à une suspension de fourniture d'énergie électrique en cas de non paiement des factures d'énergie, en limitant sa consommation. A cet effet, un disjoncteur de limitation de puissance réglé à une faible intensité peut être installé dans une habitation à la place d'un disjoncteur classique.There exist in the state of the art various types of devices suitable for limiting the power supplied to an electrical installation. Such devices make it possible, for example, to offer a customer an alternative solution to a suspension of the supply of electrical energy in the event of non-payment of energy bills, by limiting its consumption. For this purpose, a power limiting circuit breaker set to a low current can be installed in a dwelling instead of a conventional circuit breaker.
Un tel disjoncteur de limitation de puissance est d'une utilisation simple car il peut être réenclenché par le client après avoir disjoncté, mais présente l'inconvénient de nécessiter un montage complexe.Such a power limiting circuit breaker is easy to use because it can be reset by the customer after having tripped, but has the drawback of requiring complex assembly.
On peut également utiliser un fusible ayant une intensité normale déterminée en fonction de la limitation choisie et disposé à un emplacement non accessible par le client. Un tel fusible est d'un montage très aisé mais présente l'inconvénient de provoquer une coupure défini¬ tive de l'alimentation en cas de dépassement du seuil d'intensité.One can also use a fuse with a normal current determined according to the chosen limitation and placed in a location not accessible by the customer. Such a fuse is very easy to mount, but has the drawback of causing a definitive cut-off of the power supply if the current threshold is exceeded.
La présente invention vise à pallier les incon- vénients cités en proposant un dispositif de limitation de puissance permettant de limiter la consommation d'une installation électrique et de protéger cette installation contre des élévations importantes et brusques de courant.The present invention aims to overcome the aforementioned drawbacks by proposing a power limiting device making it possible to limit the consumption of an electrical installation and to protect this installation against large and sudden increases in current.
Elle a donc pour objet un dispositif de limita- tion de puissance pour installation électrique, caracté- risé en ce qu'il comporte, montés en série dans un boîtier commun entre deux bornes de connexion de ce boîtier à ladite installation, des premiers moyens de limitation de courant, réenclenchables automatiquement, adaptés pour intervenir lorsque l'intensité du courant d'alimentation de ladite installation atteint une première valeur de seuil correspondant à la valeur maximale de l'intensité du courant autorisée à circuler dans ladite installation et des seconds moyens de coupure de courant, non réenclencha- blés, ayant un temps de réponse inférieur à celui des premiers moyens de limitation de courant et adaptés pour intervenir lorsque la valeur instantanée du courant d'alimentation atteint une seconde valeur de seuil supé¬ rieure à ladite première valeur de seuil. Selon une autre caractéristique de l'invention, les premiers moyens de limitation de courant comportent un interrupteur à résistance thermique.It therefore relates to a power limiting device for electrical installation, characteristic laughed at in that it comprises, mounted in series in a common box between two connection terminals of this box to said installation, first current limiting means, resettable automatically, adapted to intervene when the intensity of the supply current of said installation reaches a first threshold value corresponding to the maximum value of the intensity of the current authorized to circulate in said installation and of second means of breaking the current, not resettable, having a response time less than that of the first current limiting means and adapted to intervene when the instantaneous value of the supply current reaches a second threshold value greater than said first threshold value. According to another characteristic of the invention, the first current limiting means comprise a thermal resistance switch.
Avantageusement, l'interrupteur comporte, dans une enveloppe en matériau isolant, un contact mobile, un contact fixe et un organe d'actionnement en relation d'échange thermique avec la résistance thermique et coopérant avec le contact mobile de manière à le déplacer entre une position fermée de passage de courant dans laquelle le contact mobile s'appuie sur le contact fixe et une position ouverte de limitation de courant.Advantageously, the switch comprises, in an envelope of insulating material, a movable contact, a fixed contact and an actuating member in heat exchange relation with the thermal resistance and cooperating with the movable contact so as to move it between a closed current flow position in which the movable contact rests on the fixed contact and an open current limiting position.
Selon une autre caractéristique de l'invention, le contact mobile et le contact fixe comportent respecti¬ vement une lame conductrice et une patte de contact, fixées chacune par une de leurs extrémités sur un support et s'appuyant l'une sur l'autre en position fermée par leur extrémité libre, et l'organe d'actionnement comporte un bilame à action brusque fixé au niveau de sa zone médiane sur un ergot ménagé sur le suppor .According to another characteristic of the invention, the movable contact and the fixed contact respectively comprise a conductive strip and a contact tab, each fixed by one of their ends on a support and bearing on one another in the closed position by their free end, and the actuating member comprises a snap action bimetal fixed at its median zone on a lug formed on the suppor.
De préférence, l'interrupteur comporte des première et seconde broches en matériau conducteur traver- sant une extrémité de l'enveloppe et étant respectivement prolongées à l'intérieur de l'enveloppe par la lame conductrice et par la patte de contact, la seconde broche étant repliée à partir de ladite extrémité vers une extrémité opposée de l'enveloppe et comportant un organe de liaison mécanique et de connexion électrique avec les seconds moyens de coupure de courant, la première broche traversant un orifice ménagé dans une borne de connexion du boîtier avec l'installation. Avantageusement, les seconds moyens de coupure de courant comportent un fusible muni de deux embouts de connexion, un de ses embouts étant relié à l'organe de liaison mécanique et de connexion électrique de l'inter¬ rupteur, l'autre embout traversant un orifice ménagé dans une borne de connexion du boîtier avec l'installation.Preferably, the switch has first and second pins made of conductive material sant one end of the envelope and being respectively extended inside the envelope by the conductive blade and by the contact tab, the second pin being folded from said end to an opposite end of the envelope and comprising a mechanical connection and electrical connection member with the second current cut-off means, the first pin passing through an orifice formed in a connection terminal of the housing with the installation. Advantageously, the second current cutoff means comprise a fuse provided with two connection end pieces, one of its end pieces being connected to the mechanical connection and electrical connection member of the interrupter, the other end piece passing through an orifice. formed in a connection terminal of the box with the installation.
D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante, donnée à titre d'exemple, en regard des dessins annexés sur lesquels : - la figure 1 est une vue en perspective éclatée d'un dispositif de limitation de puissance selon l'inven¬ tion ;Other characteristics and advantages of the invention will emerge from the following description, given by way of example, with reference to the appended drawings in which: - Figure 1 is an exploded perspective view of a power limiting device according to the invention;
- la figure 2 est une vue en coupe des premiers moyens de limitation de courant du dispositif représenté sur la figure 1, en position fermée de passage de courant; et- Figure 2 is a sectional view of the first current limiting means of the device shown in Figure 1, in the closed current flow position; and
- la figure 3 représente une vue en coupe des premiers moyens de limitation de courant du dispositif représenté sur la figure 1, en position ouverte de limita- tion de courant.- Figure 3 shows a sectional view of the first current limiting means of the device shown in Figure 1, in the open current limiting position.
Sur la figure, 1 on a représenté un dispositif de limitation de puissance selon l'invention, désigné par la référence générale 10.In the figure, 1 a power limiting device according to the invention is shown, designated by the general reference 10.
Le dispositif 10 de limitation de puissance est destiné à être installé sur le réseau d'alimentation en amont d'une installation électrique, telle qu'une instal¬ lation électrique d'une habitation, de façon à limiter la puissance qui lui est fournie.The power limiting device 10 is intended to be installed on the power supply network. upstream of an electrical installation, such as an electrical installation of a dwelling, so as to limit the power supplied to it.
Ce dispositif 10 comporte des premiers moyens de limitation de courant 12 et des seconds moyens de coupure de courant 14.This device 10 includes first current limiting means 12 and second current cutting means 14.
Les premiers moyens 12 de limitation de courant et les seconds moyens 14 de coupure de courant sont disposés en série et placés dans un boîtier commun 16, fictivement cassé sur cette figure 1, ayant de préférence des dimensions identiques à celles d'un fusible classique. Le boîtier 16 comporte un corps cylindrique 18, en céramique, entourant les premiers moyens 12 de limita¬ tion de courant et les seconds moyens 14 de coupure de courant. Le corps cylindrique 18 est muni à chacune de ses extrémités de deux bornes de connexion 20 et 22 du boîtier 16 avec l'installation, reliées respectivement aux pre¬ miers moyens 12 de limitation de courant et aux seconds moyens 14 de coupure de courant. De préférence, les bornes 20 et 22 sont serties à chaud sur le corps 18 du boîtier 16.The first current limiting means 12 and the second current breaking means 14 are arranged in series and placed in a common housing 16, fictitiously broken in this FIG. 1, preferably having dimensions identical to those of a conventional fuse. The housing 16 comprises a cylindrical body 18, made of ceramic, surrounding the first means 12 for limiting the current and the second means 14 for cutting the current. The cylindrical body 18 is provided at each of its ends with two connection terminals 20 and 22 of the housing 16 with the installation, connected respectively to the first means 12 of current limitation and to the second means 14 of current cut. Preferably, the terminals 20 and 22 are crimped hot on the body 18 of the housing 16.
Avantageusement, chaque borne de connexion 20 et 22 du boîtier 16 est pourvue d'un orifice axial, respecti¬ vement 24 et 26, ménagé dans sa paroi d'extrémité. Les premiers moyens 12 de limitation de courant comportent une enveloppe 28 sensiblement parallélépipédi- que en matériau isolant, tel qu'un matériau plastique, dans laquelle est disposé un interrupteur, qui sera décrit en référence aux figures 2 et 3. L'enveloppe 28 est munie sur une de ses extrémités 30 d'une première et d'une seconde broches 32,34 en matériau conducteur traversant l'enveloppe 28 et reliées chacune à l'interrupteur.Advantageously, each connection terminal 20 and 22 of the housing 16 is provided with an axial orifice, respectively 24 and 26, formed in its end wall. The first current limiting means 12 comprise a substantially parallelepipedic envelope 28 made of insulating material, such as a plastic material, in which a switch is disposed, which will be described with reference to FIGS. 2 and 3. The envelope 28 is provided on one of its ends 30 with first and second pins 32, 34 made of conductive material passing through the casing 28 and each connected to the switch.
L'extrémité libre de la première broche 32 des premiers moyens 12 de limitation de courant traverse l'orifice 24 de la borne de connexion 20 du boîtier 16, et est soudée à la face externe 36 de cette borne 20 de façon à réaliser une connexion électrique entre cette borne 20 et l'interrupteur.The free end of the first pin 32 of the first current limiting means 12 passes through the orifice 24 of the connection terminal 20 of the housing 16, and is welded to the external face 36 of this terminal 20 so as to make an electrical connection between this terminal 20 and the switch.
L'extrémité libre de la seconde broche 34 est repliée et se prolonge à partir de l'extrémité 30 de l'enveloppe 28 vers une extrémité opposée 38, représentée en pointillés, au niveau de laquelle cette broche 34 comporte un organe de liaison mécanique et de connexion électrique constitué par une douille 40 cylindrique destinée à coopérer avec les seconds moyens 14 de coupure de courant.The free end of the second pin 34 is folded back and extends from the end 30 of the casing 28 towards an opposite end 38, shown in dotted lines, at the level of which this pin 34 comprises a mechanical connection member and electrical connection consisting of a cylindrical socket 40 intended to cooperate with the second means 14 of current cut.
Les seconds moyens 14 de coupure de courant comportent un fusible constitué de façon connue par un fil d'alliage, non représenté, enfermé dans une cartouche 42 cylindrique en céramique et dont les extrémités sont reliées à deux embouts de connexion 44 et 46, en matériau conducteur, fermant chaque extrémité de la cartouche 42.The second current cutting means 14 comprise a fuse constituted in a known manner by an alloy wire, not shown, enclosed in a cylindrical ceramic cartridge 42 and the ends of which are connected to two connection ends 44 and 46, made of material conductor, closing each end of the cartridge 42.
De préférence, le fusible constituant les seconds moyens de coupure de courant est un fusible dont le pouvoir de coupure se situe au dessus de 20000 ampères et dont l'Intensité nominale se situe entre 5 et 20 ampères, de préférence 10 ampères.Preferably, the fuse constituting the second current breaking means is a fuse whose breaking capacity is above 20,000 amperes and whose nominal current is between 5 and 20 amperes, preferably 10 amperes.
L'embout de connexion 44 traverse l'orifice 26, de la borne de connexion 22 du boîtier 16 de manière à réaliser une connexion électrique entre cette borne 22 du boîtier lό et le fusible.The connection end piece 44 passes through the orifice 26, of the connection terminal 22 of the housing 16 so as to make an electrical connection between this terminal 22 of the housing lό and the fuse.
En référence aux figures 2 et 3, les premiers moyens 12 de limitation de courant comportent un interrup¬ teur, portant la référence générale 48. L'interrupteur 48 comporte un contact mobile, constitué par une lame conduc¬ trice 50, un contact fixe, constitué par une patte de contact 52 et un organe d'actionnement constitué par un bilame à action brusque 54, fixés sur un support 56. Cet interrupteur 48 est disposé dans l'enveloppe 28, de telle sorte que la lame conductrice 50 et le bilame 54 soient en relation d'échange thermique.Referring to Figures 2 and 3, the first means 12 comprise a current limiting tor interrup¬, bearing the general reference 48. The switch 48 includes a movable contact constituted by a blade conduc ¬ trice 50, a fixed contact, constituted by a contact tab 52 and an actuating member constituted by a snap action bimetal 54, fixed on a support 56. This switch 48 is arranged in the casing 28, such so that the conductive strip 50 and the bimetallic strip 54 are in heat exchange relationship.
La lame conductrice 50, de forme sensiblement rectiligne, est constituée par une résistance thermique. Elle est fixée par une de ses extrémités sur la première broche 32 et sur le support 56 par l'intermédiaire d'un rivet en cuivre 58. L'autre extrémité de la lame conduc¬ trice 50 porte un plot de contact et coopère avec une extrémité libre de la patte de contact 52, dont l'autre extrémité est fixée sur la seconde broche 34 et sur le support 56 par l'intermédiaire d'un second rivet en cuivre 60.The conductive strip 50, of substantially rectilinear shape, is constituted by a thermal resistance. It is fixed by one of its ends to the first pin 32 and to the support 56 by means of a copper rivet 58. The other end of the conductive blade 50 carries a contact pad and cooperates with a free end of the contact lug 52, the other end of which is fixed to the second pin 34 and to the support 56 by means of a second copper rivet 60.
En outre, la seconde broche 34 comporte une partie repliée 62 se prolongeant par une partie rectiligne 64 et par la douille 40 de réception de l'embout de connexion 46 du fusible 14.In addition, the second pin 34 has a folded part 62 extending by a rectilinear part 64 and by the socket 40 for receiving the connection end piece 46 of the fuse 14.
Par ailleurs, le support 56 comporte un ergot 66 sur lequel est fixé le bilame 54 par l'intermédiaire de sa partie médiane. Le bilame 54 présente une forme allongée de pro¬ fil sensiblement concave, dont la concavité est tournée vers le support 56 en position fermée de passage de courant (figure 2), et dont la concavité est tournée vers la lame conductrice 50 en position ouverte de limitation de courant (figure 3), dans laquelle les deux extrémités 68 et 70 du bilame 54 coopèrent respectivement avec deux saillies 72 et 74 prévues sur la face de la lame conduc¬ trice 50 placée en regard du bilame 54 de manière à écarter l'extrémité libre de cette lame 50 de la patte de contact 52 par déformation de la lame 50.Furthermore, the support 56 comprises a lug 66 on which the bimetallic strip 54 is fixed by means of its middle part. The bimetallic strip 54 has an elongated shape of a substantially concave wire, the concavity of which faces the support 56 in the closed current flow position (FIG. 2), and the concavity of which faces the conductive strip 50 in the open position of current limitation (Figure 3), in which the two ends 68 and 70 of the bimetallic strip 54 cooperate respectively with two projections 72 and 74 provided on the face of the conductive blade 50 placed opposite the bimetallic strip 54 so as to spread the free end of this blade 50 of the contact tab 52 by deformation of the blade 50.
De préférence, la résistance thermique consti¬ tuant la lame conductrice 50 et le matériau constitutif du bilame 54 sont choisis de telle sorte que le l'intensité de coupure de l'interrupteur 48 se situe sensiblement à entre 3,5 et 8 ampères, de préférence 5 ampères, de façon à limiter la puissance fournie à approximativement 1000 watts.Preferably, the thermal resistance constituting the conductive strip 50 and the material constituting the bimetal strip 54 are chosen so that the cut-off intensity of the switch 48 is substantially between 3.5 and 8 amps, of preferably 5 amps, so to limit the power supplied to approximately 1000 watts.
Le dispositif de limitation de puissance 10 décrit ci-dessus est disposé en amont de l'installation électrique d'une habitation à la place d'un fusible classique, de préférence à un emplacement non accessible par le client.The power limiting device 10 described above is arranged upstream of the electrical installation of a dwelling in place of a conventional fuse, preferably at a location not accessible by the customer.
Le courant fourni par le réseau circule dès lors dans les premiers moyens 12 de limitation de courant et dans les seconds moyens 14 de coupure de courant.The current supplied by the network therefore flows in the first current limiting means 12 and in the second current cutting means 14.
Le courant circule dans l'interrupteur 48 et en particulier dans la lame conductrice 50, constituée par la résistance thermique, qui s'échauffe. Du fait de la relation d'échange thermique entre la lame 50 et le bilame 54, l'énergie calorifique émise par la résistance thermi¬ que est transmise vers le bilame 54.The current flows in the switch 48 and in particular in the conductive strip 50, constituted by the thermal resistance, which heats up. Due to the heat exchange relationship between the blade 50 and the bimetallic strip 54, the heat energy emitted by the thermi¬ resistance that is transmitted to the bimetallic strip 54.
Lorsque la valeur de l'intensité parcourant la lame conductrice 50 atteint une première valeur de seuil, fixée par exemple comme cela a été mentionné plus haut à 5 ampères, après un temps de réponse dû au laps de temps nécessaire pour que la résistance thermique et le bilameWhen the value of the intensity traversing the conductive strip 50 reaches a first threshold value, fixed for example as was mentioned above at 5 amperes, after a response time due to the period of time necessary for the thermal resistance and the bimetallic strip
54 s'échauffent, l'interrupteur 48 passe brusquement de sa position fermée de passage de courant vers sa position ouverte d'Interruption de courant sous l'effet du change- ment brusque de concavité du bilame 54. En position ouverte, la concavité du bilame 54 est tournée vers la lame 50 et les extrémités 68 et 70 du bilame 54 repoussent les saillies 72 et 74 de la lame 50. Dès lors, la lame 50 est déformée et son extrémité libre s'écarte de la patte de contact 52 ce qui provoque une interruption de courant.54 heat up, the switch 48 suddenly passes from its closed current flow position to its open current interruption position under the effect of the sudden change in concavity of the bimetallic strip 54. In the open position, the concavity of the bimetallic strip 54 is turned towards the blade 50 and the ends 68 and 70 of the bimetallic strip 54 repel the projections 72 and 74 of the blade 50. Consequently, the blade 50 is deformed and its free end deviates from the contact tab 52 ce which causes a power outage.
La lame conductrice 50 n'étant plus parcourue par un courant, la résistance thermique et le bilame 54 se refroidissent.Since the conductive strip 50 is no longer traversed by a current, the thermal resistance and the bimetallic strip 54 cool.
Après un second temps de réponse dû au laps de temps nécessaire pour que la résistance thermique et le bilame 54 se refroidissent, le bilame 54 revient dans sa position initiale et ses extrémités 68 et 70 s'écartent de la lame 50 qui revient alors dans sa position initiale. Le courant circule donc à nouveau dans le dispositif et l'alimentation de l'installation électrique est à nouveau assurée, l'extrémité libre de la lame conductrice 50 s'appuyant sur la patte de contact 52.After a second response time due to the time required for the thermal resistance and the bimetallic strip 54 cool, the bimetallic strip 54 returns to its initial position and its ends 68 and 70 move away from the blade 50 which then returns to its initial position. The current therefore again flows through the device and the power supply to the electrical installation is again ensured, the free end of the conductive strip 50 resting on the contact tab 52.
Bien entendu, les temps de réponse nécessaires respectivement pour le passage de la position fermée à la position ouverte et de la position ouverte à la position fermée sont déterminés en choisissant de façon appropriée les matériaux constitutifs de la résistance thermique et du bilame.Of course, the response times required respectively for the transition from the closed position to the open position and from the open position to the closed position are determined by appropriately choosing the materials constituting the thermal resistance and the bimetallic strip.
Par exemple, les temps de réponse à l'ouverture et à la fermeture sont égaux et sont sensiblement de 1 mn.For example, the response times for opening and closing are equal and are approximately 1 minute.
Le fusible constitutif des seconds moyens 14 de coupure de courant préserite de façon connue un temps de réponse très faible et inférieur à celui de l'interrupteur 48. Ainsi, lorsqu'apparaît une élévation brusque de la valeur instantanée du courant circulant dans le dispo¬ sitif, supérieure au seuil d'intervention des premiers moyens de limitation et susceptible d'endommager l'instal¬ lation électrique branchée en aval, le fil d'alliage contenu dans la cartouche 42, est rompu avant l'ouverture de l'interrupteur 48 en raison du temps de réponse de celui-ci, ce qui provoque une coupure d'alimentation, et permet de protéger l'installation branchée en aval et en amont du dispositif. Le dispositif qui a été décrit permet donc de limiter la puissance fournie à une installation électrique à une valeur de seuil prédéterminée, tout en autorisant un dépassement de ce seuil pendant un temps très bref, mais en protégeant cette installation contre des courts-cir- cuits. En outre, ce dispositif est d'un montage très aisé et peut donc aisément être installé chez un client, dans le cas où celui-ci n'a pas acquité ses factures d'énergie, en remplacement d'un fusible conventionnel, ou être facilement remplacé par un fusible conventionnel après que le client ait payé ses dettes.The fuse constituting the second current cutoff means 14 preserves in a known manner a very low response time and less than that of the switch 48. Thus, when a sudden rise in the instantaneous value of the current flowing in the device appears sitive, higher than the intervention threshold of the first limiting means and liable to damage the electrical installation connected downstream, the alloy wire contained in the cartridge 42 is broken before the switch 48 opens due to the response time thereof, which causes a power cut, and makes it possible to protect the installation connected downstream and upstream of the device. The device which has been described therefore makes it possible to limit the power supplied to an electrical installation to a predetermined threshold value, while allowing this threshold to be exceeded for a very short time, but protecting this installation against short-circuits . In addition, this device is very easy to assemble and can therefore easily be installed at a customer, in the event that the latter has not paid his energy bills, replacing a conventional fuse, or be easily replaced by a conventional fuse after the customer has paid their debts.
Bien entendu, l'invention n'est pas limitée au mode de réalisation qui a été décrit.Of course, the invention is not limited to the embodiment which has been described.
C'est ainsi que le boîtier dans lequel sont enfermés les premiers moyens de limitation de courant et les seconds moyens de coupure de courant peut comporter un corps en forme de parallélépipède rectangle muni au niveau de chacune de ses faces d'extrémité d'un couteau de contact électrique. C'est également ainsi que les valeurs de seuil peuvent être modifiées selon la limitation de puissance et la protection désirées. Thus, the box in which the first current limiting means and the second current breaking means are enclosed may comprise a body in the shape of a rectangular parallelepiped provided at each of its end faces with a knife. electrical contact. This is also how the threshold values can be modified according to the desired power limitation and protection.

Claims

REVENDICATIONS 1. Dispositif de limitation de puissance pour installation électrique comprenant, montés en série dans un boîtier (16) commun entre deux bornes (20,22) de connexion de ce boîtier (16) à ladite installation, des premiers moyens (12) de limitation de courant, réenclen¬ chables automatiquement, comprenant un interrupteur (48) à résistance thermique et adaptés pour intervenir lorsque l'intensité du courant d'alimentation de ladite instal- lation atteint une première valeur de seuil correspondant à la valeur maximale de l'intensité du courant autorisée à circuler dans ladite installation et des seconds moyens (14) de coupure de courant, non réenclenchables, ayant un temps de réponse inférieur à celui des premiers moyens (12) de limitation de courant et adaptés pour intervenir lorsque la valeur instantanée du courant d'alimentation atteint une seconde valeur de seuil supérieure à ladite première valeur de seuil, caractérisé en ce que l'inter¬ rupteur (48) comporte, dans une enveloppe (28) en matériau isolant, un contact mobile (50) sensiblement rectiligne, une patte de contact fixe (52) et un bilame (54) sensible¬ ment concave à action brusque en relation d'échange thermique avec la résistance thermique et coopérant avec le contact mobile (50) de manière à le déplacer entre une position fermée de passage de courant dans laquelle le contact mobile (50) s'appuie sur la patte de contact (52) et une position ouverte de limitation de courant, et en ce que l'interrupteur (48) comporte des première (32) et seconde (34) broches en matériau conducteur traversant une extrémité (30) de l'enveloppe (28) et étant respectivement prolongées à l'intérieur de l'enveloppe (28) par la lame conductrice (50) et par la patte de contact (52), la seconde broche (34) étant repliée à partir de ladite extrémité vers une extrémité opposée de l'enveloppe (28) et comportant un organe de liaison mécanique et de con- nexion électrique (40) avec les seconds moyens (14) de coupure de courant, la première broche (32) traversant un orifice (24) ménagé dans une borne (20) de connexion du boîtier (16) avec l'installation. CLAIMS 1. Power limiting device for electrical installation comprising, mounted in series in a housing (16) common between two terminals (20,22) for connection of this housing (16) to said installation, first means (12) for current limitation, automatically resettable, comprising a thermal resistance switch (48) and adapted to intervene when the intensity of the supply current of said installation reaches a first threshold value corresponding to the maximum value of the intensity of the current authorized to circulate in said installation and of the second means (14) of cut of current, not resettable, having a response time lower than that of the first means (12) of current limitation and adapted to intervene when the instantaneous value of the supply current reaches a second threshold value greater than said first threshold value, characterized in that the inter¬ ur (48) comprises, in an envelope (28) of insulating material, a movable contact (50) substantially rectilinear, a fixed contact tab (52) and a bimetallic strip (54) substantially concave with abrupt action in relation to heat exchange with the thermal resistance and cooperating with the movable contact (50) so as to move it between a closed current flow position in which the movable contact (50) rests on the contact tab (52) and a position open current limiting, and in that the switch (48) comprises first (32) and second (34) pins of conductive material passing through one end (30) of the casing (28) and being respectively extended to the inside the envelope (28) by the conductive blade (50) and by the contact tab (52), the second pin (34) being folded from said end towards an opposite end of the envelope (28) and comprising a mechanical connection and electrical connection (40) with the second means (14) for cutting the current, the first pin (32) passing through an orifice (24) formed in a terminal (20) for connection of the housing (16) with the installation.
2. Dispositif de limitation de puissance selon la revendication 1, caractérisé en ce que les seconds moyens de coupure de courant comportent un fusible (14) muni de deux embouts de connexion (44,46), un (46) de ses embouts étant relié à l'organe de liaison mécanique et de connexion électrique (40) de l'interrupteur (48), l'autre embout (44) traversant un orifice (26) ménagé dans une borne (22) de connexion du boîtier (16) avec l'installa¬ tion.2. Power limiting device according to claim 1, characterized in that the second current cutting means comprise a fuse (14) provided with two connection end pieces (44,46), one (46) of its end pieces being connected to the mechanical connection and electrical connection member (40) of the switch (48), the other end piece (44) passing through an orifice (26) formed in a terminal (22) for connecting the housing (16) with the installation.
3. Dispositif de limitation de puissance selon la revendication 2, caractérisé en ce que l'organe de liaison mécanique et de connexion électrique de l'inter¬ rupteur (48) comporte une douille (40) de réception d'un embout (46) du fusible (14).3. Power limiting device according to claim 2, characterized in that the mechanical connection and electrical connection member of the interrupter (48) comprises a socket (40) for receiving a nozzle (46) of the fuse (14).
4. Dispositif de limitation de puissance selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la première valeur de seuil se situe entre 3,5 ampères et 8 ampères, de préférence 5 ampères, et en ce que la seconde valeur de seuil se situe entre 5 ampères et 20 ampères, de préférence 10 ampères. 4. Power limiting device according to any one of claims 1 to 3, characterized in that the first threshold value is between 3.5 amperes and 8 amperes, preferably 5 amperes, and in that the second value threshold is between 5 amps and 20 amps, preferably 10 amps.
EP95932038A 1994-09-22 1995-09-21 Power limiting device for electric installation Expired - Lifetime EP0782757B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9411328A FR2725082A1 (en) 1994-09-22 1994-09-22 POWER LIMITATION DEVICE FOR ELECTRICAL INSTALLATION
FR9411328 1994-09-22
PCT/FR1995/001216 WO1996009634A1 (en) 1994-09-22 1995-09-21 Power limiting device for electric installation

Publications (2)

Publication Number Publication Date
EP0782757A1 true EP0782757A1 (en) 1997-07-09
EP0782757B1 EP0782757B1 (en) 1998-04-08

Family

ID=9467179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95932038A Expired - Lifetime EP0782757B1 (en) 1994-09-22 1995-09-21 Power limiting device for electric installation

Country Status (7)

Country Link
EP (1) EP0782757B1 (en)
AT (1) ATE164965T1 (en)
BR (1) BR9509174A (en)
DE (1) DE69502026T2 (en)
ES (1) ES2118621T3 (en)
FR (1) FR2725082A1 (en)
WO (1) WO1996009634A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2815484B1 (en) * 2000-10-13 2002-12-20 Electricite De France ELECTRIC POWER LIMITER CONSUMED IN A SYSTEM
DE10238481B4 (en) * 2002-08-22 2005-12-08 Wieland Electric Gmbh Fuse carrier

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2074400A (en) * 1935-04-24 1937-03-23 Indicating Fuse Mfg Corp Dual fuse with indicator
US2240239A (en) * 1938-10-10 1941-04-29 Herbert E Brannon Electric fuse
US2277619A (en) * 1939-12-28 1942-03-24 Westinghouse Electric & Mfg Co Circuit interrupter
US2299728A (en) * 1940-02-15 1942-10-27 Herbert E Brannon Electric circuit breaker
DE3539425A1 (en) * 1985-11-07 1987-05-14 Limitor Ag THERMOBI METAL SWITCH
JPS62268030A (en) * 1986-05-15 1987-11-20 東部電気株式会社 Protector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9609634A1 *

Also Published As

Publication number Publication date
FR2725082A1 (en) 1996-03-29
ES2118621T3 (en) 1998-09-16
DE69502026T2 (en) 1998-10-08
DE69502026D1 (en) 1998-05-14
BR9509174A (en) 1997-11-25
FR2725082B1 (en) 1997-02-07
WO1996009634A1 (en) 1996-03-28
EP0782757B1 (en) 1998-04-08
ATE164965T1 (en) 1998-04-15

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