EP1708222A2 - Protection device having a crimped element biased in the switching off direction, and use of said device in a lightning arrestor - Google Patents

Protection device having a crimped element biased in the switching off direction, and use of said device in a lightning arrestor Download PDF

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Publication number
EP1708222A2
EP1708222A2 EP06290455A EP06290455A EP1708222A2 EP 1708222 A2 EP1708222 A2 EP 1708222A2 EP 06290455 A EP06290455 A EP 06290455A EP 06290455 A EP06290455 A EP 06290455A EP 1708222 A2 EP1708222 A2 EP 1708222A2
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EP
European Patent Office
Prior art keywords
fuse piece
fuse
pads
piece
studs
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
EP06290455A
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German (de)
French (fr)
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EP1708222A3 (en
EP1708222B1 (en
Inventor
Marcel Meriguet
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.)
Legrand SNC
Legrand France SA
Original Assignee
Legrand SNC
Legrand France SA
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Publication date
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Priority to PL06290455T priority Critical patent/PL1708222T3/en
Publication of EP1708222A2 publication Critical patent/EP1708222A2/en
Publication of EP1708222A3 publication Critical patent/EP1708222A3/en
Application granted granted Critical
Publication of EP1708222B1 publication Critical patent/EP1708222B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • 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
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/32—Insulating body insertable between contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/38—Means for extinguishing or suppressing arc
    • H01H2085/381—Means for extinguishing or suppressing arc with insulating body insertable between the end contacts of the fusible element

Definitions

  • the invention relates, in general, the protection of electrical equipment.
  • the invention relates, according to a first aspect, to an electrical protection device comprising at least first and second connection pads aligned in a first direction, a fusible conductive part having first and second ends respectively in electrical contact. and mechanics with the first and second pads, and biasing means exerting on the fuse piece an elastic force applied between the two pads in a second direction transverse to the first, the fuse piece initially adopting an operational configuration in which it provides a link electrical connection between the first and second pads, and adopting, under the effect of a rise in temperature and the elastic force, a final configuration of rupture in which the electrical connection is broken.
  • Such a device is for example described in the patent document Japanese JP 8031299 .
  • Systems of this type conventionally include a clipping component, such as a varistor, which is connected in series with a temperature sensitive switch.
  • the varistors are, towards the end of their life, the seat of a significant heating, the thermosensitive switch having precisely the function of disconnecting the varistor before that this heating does not reach a value such that it generates risks of explosion or fire.
  • the temperature sensitive switch is formed of a fuse wire stretched between the first and second pads and subjected to an elastic bias in the direction of rupture.
  • the wire In case of excessive heating, the wire loses its mechanical strength by partial or total melting, and undergoes a break insulating from each other the first and second pads.
  • the object of the present invention is to propose an electrical protection device in which the fuse piece is fixed to each of the two pads in a simple, reproducible and reliable manner.
  • the device of the invention is essentially characterized in that the fuse piece is constituted by a block of predefined shape, in that each connection pad and the end of the fuse piece in contact with this stud are provided with respective mechanical retaining means, and in that the retaining means of the studs and the fuse piece are shaped to allow forcible entrenchment of the fuse piece in the studs by a relative movement in a third direction perpendicular to the first and second directions, the electrical contact of the fuse piece with the pads resulting at least partially from this embedding.
  • the means for retaining the studs and the fuse piece have respective abutment surfaces facing each other and inclined with respect to the first direction. respective bearing being arranged to exert on each other increasing bearing forces in response to increasing traction exerted between each stud and the fuse piece.
  • Each pad comprises, for example, a metal flange elastically flexed, cut and folded, this stud and the fuse piece being dimensioned so that the embedding of the fuse piece in this stud causes an elastic deformation of the blank constituting the stud.
  • the biasing means comprise an insulating part and elastic means and that the insulating part is urged by the elastic means to adopt, in the operational configuration of the fuse piece, an armed position in which it exerts said elastic force on the fuse piece, and to adopt, in the rupture configuration of the fuse piece, a triggered position in which it interposes between the first and second studs.
  • the insulating part may have first and second sails respectively adjacent to the first and second pads, extending in respective planes perpendicular to the first direction, and having front edges resting on the part fuse in the operational configuration thereof.
  • the insulating part may even have a cavity defined between the first and second webs and extending in the second direction, so as to absorb a portion of the fuse piece during its break.
  • the insulating part has, in the third direction, a dimension, or height, greater than the corresponding dimension, or height, of the fuse piece.
  • the triggered position of the insulating part is itself advantageously separated from the armed position of this part by a stroke at least equal to the distance separating the two studs.
  • the invention also relates to the application of the device as previously described to the production of a surge arrester cell comprising a varistor, and wherein the first stud is connected to or constitutes a first power supply terminal of the varistor, in which the second plot is connected to a first terminal connecting the device to an electrical network or constitutes it, and wherein the varistor comprises a second power supply terminal which is connected to a second terminal of the device to an electrical network or which constitutes it.
  • the invention relates to an electrical protection device comprising in particular two connection pads 11 and 12, a fusible conductive part 2, and biasing means typically constituted by an insulating part 3 and a spring 4 acting on this insulating part 3.
  • connection pads 11 and 12 are aligned in a direction D1 (FIGS. 7 and 10a) and are respectively in electrical and mechanical contact with the ends 21 and 22 of the fuse part 2.
  • the fuse part 2 initially adopts an illustrated operational configuration, in particular in Figures 4, 10c and 11c, wherein it provides an electrical connection between the pads 11 and 12.
  • the insulating part 3 adopts, under the bias of the spring 4, an armed position (FIGS. 1 to 3 and 5) in which it exerts an elastic force F (FIG. 2) on the fuse piece 2, this force being applied between the pads 11 and 12 in the direction D2 transverse to the direction D1.
  • the fuse piece 2 can also adopt, under the effect of a rise in temperature and the elastic force F, a rupture configuration in which the electrical connection between the pads 11 and 12 is broken.
  • the insulating part 3 adopts, under the bias of the spring 4, a triggered position (FIGS. 6 to 9) in which it interposes between the pads 11 and 12.
  • the fuse piece 2 consists of a block of predefined shape, for example made of bismuth or of a bismuth alloy.
  • predefined block of shape must be understood here as applicable to any block of material that can be handled at room temperature, without any particular precaution, or to be stored in bulk, at ambient temperature, with other blocks. of the same type without undergoing visible deformation.
  • connection pads 11 and 12 and the corresponding end 21 or 22 of the fuse piece 2 are provided with respective mechanical retaining means 51 and 52 (FIGS. 10a to 11c) typically, although not exclusively, in the form of reliefs complementary.
  • these retaining means 51 and 52 are shaped to allow forced embedding of the fuse piece 2 in the studs 11 and 12 by a relative movement in a direction D3 perpendicular to both in the direction D1 of mutual alignment of the pads 11 and 12 and the direction D2 of application of the elastic force F.
  • the electrical contact of the fuse piece 2 with the pads 11 and 12 results at least in part from this encasement, and is preferably provided only by the latter.
  • the retaining means 51 and 52 which are respectively provided with the pads 11, 12 and the fuse piece 2, have respective bearing surfaces S1 and S2 opposite one another and inclined with respect to the direction D1 ( Figures 10a to 11c).
  • these respective bearing surfaces S1 and S2 are arranged to exert on each other increasing bearing forces in response to increasing traction exerted between each of the pads 11 and 12 and the fuse piece 2.
  • each of the pads 11 and 12 is formed of a metal blank, flexural elastic, cut and folded.
  • each of these pads 11 and 12, and the fuse piece 2 are dimensioned so that the embedding of this fuse piece 2 in each pad causes an elastic deformation of the blank constituting this pad, the electrical contact between the fuse piece 2 and this pad is thus optimized.
  • the insulating part 3 has two webs 31 and 32 respectively adjacent to the pads 11 and 12, and extending in respective planes perpendicular to the direction D1.
  • the insulating part 3 may have (FIG. 7) a cavity 30 extending in the direction D2 of application of the force F.
  • This cavity is defined between the webs 31 and 32 and optionally delimited by a third sail 33.
  • the insulating part 3 advantageously has, in the third direction D3, a height H3 greater than the corresponding height H2 of the fuse piece 2.
  • the insulating part 3 also has a rest face 34 perpendicular to the direction D3 and resting on the fuse piece 2 in the operational configuration thereof.
  • the device thus constituted can be applied to the production of a surge arrester cell comprising a varistor 6.
  • the stud 11 can be connected to a first power supply terminal of the varistor 6 or directly constitute this first terminal of food.
  • the stud 12 may in turn be connected to a first connection terminal of the cell to an electrical network or constitute directly this first branch terminal.
  • the second power supply terminal 62 of the varistor 6 can then be connected to a second connection terminal of the cell to an electrical network, or directly constitute this second branch terminal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuses (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Thermistors And Varistors (AREA)

Abstract

The device has a fuse (2) with two ends (21, 22) in electrical and mechanical contact with two connection studs (11, 12), respectively, where the studs and the ends of the fuse are equipped with the respective mechanical retaining units. The retaining units and the fuse are structured such that a forced fitting of the fuse in each stud causes an elastic deformation of a metallic blank constituting the stud. An insulator has two wings, respectively, adjacent to the studs and with front edges supported on the fuse in an operational configuration of the fuse.

Description

L'invention concerne, de façon générale, la protection des appareillages électriques.The invention relates, in general, the protection of electrical equipment.

Plus précisément, l'invention concerne, selon un premier de ses aspects, un dispositif de protection électrique comprenant au moins des premier et second plots de connexion alignés suivant une première direction, une pièce conductrice fusible présentant des première et seconde extrémités respectivement en contact électrique et mécanique avec les premier et second plots, et des moyens de sollicitation exerçant sur la pièce fusible une force élastique appliquée entre les deux plots suivant une deuxième direction transversale à la première, la pièce fusible adoptant originellement une configuration opérationnelle dans laquelle elle assure une liaison électrique entre les premier et second plots, et adoptant, sous l'effet d'une élévation de température et de la force élastique, une configuration finale de rupture dans laquelle la liaison électrique est rompue.More specifically, the invention relates, according to a first aspect, to an electrical protection device comprising at least first and second connection pads aligned in a first direction, a fusible conductive part having first and second ends respectively in electrical contact. and mechanics with the first and second pads, and biasing means exerting on the fuse piece an elastic force applied between the two pads in a second direction transverse to the first, the fuse piece initially adopting an operational configuration in which it provides a link electrical connection between the first and second pads, and adopting, under the effect of a rise in temperature and the elastic force, a final configuration of rupture in which the electrical connection is broken.

Un tel dispositif est par exemple décrit dans le document de brevet japonais JP 8031299 .Such a device is for example described in the patent document Japanese JP 8031299 .

Ce document décrit un système de protection bien connu de l'homme du métier, notamment sous la dénomination de "cellule parafoudre", et dont divers autres exemples sont donnés dans les brevets US 3 889 22 , US 4 015 228 ou encore US 4 288 833 .This document describes a protection system well known to those skilled in the art, especially under the name of "surge arrester cell", and of which various other examples are given in the patents. US 3,889,222 , US 4,015,228 or US 4,288,833 .

Les systèmes de ce type comprennent classiquement un composant d'écrêtage, tel qu'une varistance, qui est monté en série avec un interrupteur thermo-sensible.Systems of this type conventionally include a clipping component, such as a varistor, which is connected in series with a temperature sensitive switch.

En effet, comme indiqué dans les trois brevets américains sus-mentionnés, les varistances sont, vers la fin de leur durée de vie, le siège d'un échauffement important, l'interrupteur thermo-sensible ayant précisément pour fonction de déconnecter la varistance avant que cet échauffement n'atteigne une valeur telle qu'il engendre des risques d'explosion ou d'incendie.Indeed, as indicated in the three US patents mentioned above, the varistors are, towards the end of their life, the seat of a significant heating, the thermosensitive switch having precisely the function of disconnecting the varistor before that this heating does not reach a value such that it generates risks of explosion or fire.

Selon le document de brevet japonais JP 8031299 , l'interrupteur thermo-sensible est formé d'un fil fusible tendu entre les premier et second plots et soumis à une sollicitation élastique dans le sens de sa rupture.According to the patent document Japanese JP 8031299 , the temperature sensitive switch is formed of a fuse wire stretched between the first and second pads and subjected to an elastic bias in the direction of rupture.

En cas d'échauffement excessif, le fil perd sa résistance mécanique par fusion partielle ou totale, et subit une rupture isolant l'un de l'autre les premier et second plots.In case of excessive heating, the wire loses its mechanical strength by partial or total melting, and undergoes a break insulating from each other the first and second pads.

Dans un tel agencement, la fixation du fil fusible à chacun des deux plots pose de sérieux problèmes de reproductibilité et de fiabilité, dont la solution imparfaite peut être à l'origine de graves dysfonctionnements.
Dans ce contexte, la présente invention a pour but de proposer un dispositif de protection électrique dans lequel la pièce fusible est fixée à chacun des deux plots de manière simple, reproductible et fiable.In such an arrangement, the fixing of the fuse wire to each of the two studs poses serious problems of reproducibility and reliability, whose imperfect solution can be the source of serious malfunctions.
In this context, the object of the present invention is to propose an electrical protection device in which the fuse piece is fixed to each of the two pads in a simple, reproducible and reliable manner.

A cette fin, le dispositif de l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule ci-dessus, est essentiellement caractérisé en ce que la pièce fusible est constituée par un bloc de forme prédéfinie, en ce que chaque plot de connexion et l'extrémité de la pièce fusible en contact avec ce plot sont dotés de moyens de retenue mécanique respectifs, et en ce que les moyens de retenue des plots et de la pièce fusible sont conformés pour autoriser un enchâssement à force dé la pièce fusible dans les plots par un mouvement relatif suivant une troisième direction perpendiculaire aux première et deuxième directions, le contact électrique de la pièce fusible avec les plots résultant au moins partiellement de cet enchâssement.To this end, the device of the invention, moreover in accordance with the generic definition given in the preamble above, is essentially characterized in that the fuse piece is constituted by a block of predefined shape, in that each connection pad and the end of the fuse piece in contact with this stud are provided with respective mechanical retaining means, and in that the retaining means of the studs and the fuse piece are shaped to allow forcible entrenchment of the fuse piece in the studs by a relative movement in a third direction perpendicular to the first and second directions, the electrical contact of the fuse piece with the pads resulting at least partially from this embedding.

Dans le mode de réalisation préféré de l'invention, les moyens de retenue des plots et de la pièce fusible présentent des surfaces d'appui respectives en regard l'une de l'autre et inclinées par rapport à la première direction, ces surfaces d'appui respectives étant disposées pour exercer l'une sur l'autre des forces d'appui croissantes en réponse à une traction croissante exercée entre chaque plot et la pièce fusible.In the preferred embodiment of the invention, the means for retaining the studs and the fuse piece have respective abutment surfaces facing each other and inclined with respect to the first direction. respective bearing being arranged to exert on each other increasing bearing forces in response to increasing traction exerted between each stud and the fuse piece.

Il est même envisageable de prévoir que le contact électrique de la pièce fusible avec les plots soit exclusivement assuré par l'enchâssement de la pièce fusible dans les plots.It is even conceivable to provide that the electrical contact of the fuse piece with the pads is exclusively ensured by the embedding of the fuse piece in the pads.

Chaque plot comprend par exemple un flan métallique, élastique en flexion, découpé et plié, ce plot et la pièce fusible étant dimensionnés de manière que l'enchâssement de la pièce fusible dans ce plot provoque une déformation élastique du flan constituant ce plot.Each pad comprises, for example, a metal flange elastically flexed, cut and folded, this stud and the fuse piece being dimensioned so that the embedding of the fuse piece in this stud causes an elastic deformation of the blank constituting the stud.

Pour parfaire l'isolation des plots après rupture, il peut être utile de prévoir que les moyens de sollicitation comprennent une pièce isolante et des moyens élastiques et que la pièce isolante soit sollicitée par les moyens élastiques pour adopter, dans la configuration opérationnelle de la pièce fusible, une position armée dans laquelle elle exerce ladite force élastique sur la pièce fusible, et pour adopter, dans la configuration de rupture de la pièce fusible, une position déclenchée dans laquelle elle s'interpose entre les premier et second plots.To complete the insulation of the pads after rupture, it may be useful to provide that the biasing means comprise an insulating part and elastic means and that the insulating part is urged by the elastic means to adopt, in the operational configuration of the fuse piece, an armed position in which it exerts said elastic force on the fuse piece, and to adopt, in the rupture configuration of the fuse piece, a triggered position in which it interposes between the first and second studs.

Pour faciliter la rupture de la pièce fusible, la pièce isolante peut présenter des premier et deuxième voiles respectivement adjacents aux premier et deuxième plots, s'étendant dans des plans respectifs perpendiculaires à la première direction, et présentant des bords frontaux en appui sur la pièce fusible dans la configuration opérationnelle de celle-ci.To facilitate the breaking of the fuse piece, the insulating part may have first and second sails respectively adjacent to the first and second pads, extending in respective planes perpendicular to the first direction, and having front edges resting on the part fuse in the operational configuration thereof.

La pièce isolante peut même présenter une cavité définie entre les premier et deuxième voiles et s'étendant suivant la deuxième direction, de manière à absorber une partie de la pièce fusible lors de sa rupture.The insulating part may even have a cavity defined between the first and second webs and extending in the second direction, so as to absorb a portion of the fuse piece during its break.

De préférence, la pièce isolante présente, suivant la troisième direction, une dimension, ou hauteur, supérieure à la dimension correspondante, ou hauteur, de la pièce fusible.Preferably, the insulating part has, in the third direction, a dimension, or height, greater than the corresponding dimension, or height, of the fuse piece.

La position déclenchée de la pièce isolante est elle-même avantageusement séparée de la position armée de cette pièce par une course au moins égale à la distance séparant les deux plots.The triggered position of the insulating part is itself advantageously separated from the armed position of this part by a stroke at least equal to the distance separating the two studs.

L'invention concerne également l'application du dispositif tel que précédemment décrit à la réalisation d'une cellule parafoudre comprenant une varistance, et dans laquelle le premier plot est relié à une première borne d'alimentation de la varistance ou la constitue, dans laquelle le second plot est relié à une première borne de branchement du dispositif à un réseau électrique ou la constitue, et dans laquelle la varistance comprend une deuxième borne d'alimentation qui est reliée à une deuxième borne de branchement du dispositif à un réseau électrique ou qui la constitue.The invention also relates to the application of the device as previously described to the production of a surge arrester cell comprising a varistor, and wherein the first stud is connected to or constitutes a first power supply terminal of the varistor, in which the second plot is connected to a first terminal connecting the device to an electrical network or constitutes it, and wherein the varistor comprises a second power supply terminal which is connected to a second terminal of the device to an electrical network or which constitutes it.

D'autres caractéristiques et avantages de l'invention ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une vue en perspective d'un dispositif de protection conforme à l'invention vu sous un premier angle d'observation, la pièce fusible y étant illustrée en configuration opérationnelle et la pièce isolante en position armée;
  • la figure 2 est une vue agrandie du détail repéré par la référence II sur la figure 1;
  • la figure 3 est une vue en perspective d'un dispositif de protection conforme à l'invention vu sous un deuxième angle d'observation, la pièce fusible y étant toujours illustrée en configuration opérationnelle et la pièce isolante en position armée;
  • la figure 4 est une vue en perspective agrandie de la pièce fusible utilisée dans le dispositif illustré aux figures 1 à 3;
  • la figure 5 est une vue de dessus du dispositif illustré aux figures 1 à 3;
  • la figure 6 est une vue en perspective légèrement agrandie du dispositif de protection représenté à la figure 3 et sous le même angle d'observation, la pièce fusible y étant illustrée en configuration de rupture et la pièce isolante en position déclenchée;
  • la figure 7 est une vue agrandie et écorchée du détail repéré par la référence VII sur la figure 6;
  • la figure 8 est une vue de dessus du dispositif illustré à la figure 6, la pièce fusible étant représentée en configuration de rupture et la pièce isolante en position déclenchée;
  • la figure 9 est une vue en coupe partielle du dispositif illustré à la figure 8 et observé suivant l'incidence définie par les flèches IX-IX de la figure 8;
  • Les figures 10a à 10c sont des vues en perspective agrandies illustrant l'assemblage d'une pièce fusible et de deux plots conformes à une forme d'exécution possible de ces éléments dans le cadre de l'invention; et
  • Les figures 11a à 11c sont des vues en perspective agrandies illustrant l'assemblage d'une pièce fusible et de deux plots conformes à une autre forme d'exécution possible de ces éléments dans le cadre de l'invention.
Other characteristics and advantages of the invention will emerge clearly from the description which is given hereinafter, by way of indication and in no way limitative, with reference to the appended drawings, in which:
  • Figure 1 is a perspective view of a protection device according to the invention seen at a first viewing angle, the fuse piece being illustrated in operational configuration and the insulating part in the armed position;
  • Figure 2 is an enlarged view of the detail indicated by reference II in Figure 1;
  • Figure 3 is a perspective view of a protection device according to the invention seen at a second viewing angle, the fuse piece still being illustrated in operational configuration and the insulating part in the armed position;
  • Figure 4 is an enlarged perspective view of the fuse member used in the device shown in Figures 1 to 3;
  • Figure 5 is a top view of the device shown in Figures 1 to 3;
  • FIG. 6 is a slightly enlarged perspective view of the protection device represented in FIG. 3 and at the same observation angle, the fuse piece being illustrated in rupture configuration and the insulating part in the tripped position;
  • Figure 7 is an enlarged and cutaway view of the detail indicated by reference VII in Figure 6;
  • Figure 8 is a top view of the device shown in Figure 6, the fuse part being shown in rupture configuration and the insulating part in the tripped position;
  • Figure 9 is a partial sectional view of the device illustrated in Figure 8 and observed according to the incidence defined by the arrows IX-IX of Figure 8;
  • Figures 10a to 10c are enlarged perspective views illustrating the assembly of a fuse piece and two pads according to a possible embodiment of these elements within the scope of the invention; and
  • Figures 11a to 11c are enlarged perspective views illustrating the assembly of a fuse piece and two pads in accordance with another possible embodiment of these elements within the scope of the invention.

Comme annoncé précédemment, l'invention concerne un dispositif de protection électrique comprenant notamment deux plots de connexion 11 et 12, une pièce conductrice fusible 2, et des moyens de sollicitation typiquement constitués par une pièce isolante 3 et par un ressort 4 agissant sur cette pièce isolante 3.As previously announced, the invention relates to an electrical protection device comprising in particular two connection pads 11 and 12, a fusible conductive part 2, and biasing means typically constituted by an insulating part 3 and a spring 4 acting on this insulating part 3.

Les plots de connexion 11 et 12 sont alignés suivant une direction D1 (figures 7 et 10a) et sont respectivement en contact électrique et mécanique avec les extrémités 21 et 22 de la pièce fusible 2. La pièce fusible 2 adopte originellement une configuration opérationnelle illustrée notamment aux figures 4, 10c et 11c, dans laquelle elle assure une liaison électrique entre les plots 11 et 12.The connection pads 11 and 12 are aligned in a direction D1 (FIGS. 7 and 10a) and are respectively in electrical and mechanical contact with the ends 21 and 22 of the fuse part 2. The fuse part 2 initially adopts an illustrated operational configuration, in particular in Figures 4, 10c and 11c, wherein it provides an electrical connection between the pads 11 and 12.

Dans cette configuration opérationnelle de la pièce fusible 2, la pièce isolante 3 adopte, sous la sollicitation du ressort 4, une position armée (figures 1 à 3 et 5) dans laquelle elle exerce une force élastique F (figure 2) sur la pièce fusible 2, cette force étant appliquée entre les plots 11 et 12 suivant la direction D2 transversale à la direction D1.In this operational configuration of the fuse piece 2, the insulating part 3 adopts, under the bias of the spring 4, an armed position (FIGS. 1 to 3 and 5) in which it exerts an elastic force F (FIG. 2) on the fuse piece 2, this force being applied between the pads 11 and 12 in the direction D2 transverse to the direction D1.

Cependant, la pièce fusible 2 peut aussi adopter, sous l'effet d'une élévation de température et de la force élastique F, une configuration de rupture dans laquelle la liaison électrique entre les plots 11 et 12 est rompue.However, the fuse piece 2 can also adopt, under the effect of a rise in temperature and the elastic force F, a rupture configuration in which the electrical connection between the pads 11 and 12 is broken.

Dans cette configuration de rupture de la pièce fusible 2, la pièce isolante 3 adopte, sous la sollicitation du ressort 4, une position déclenchée (figures 6 à 9) dans laquelle elle s'interpose entre les plots 11 et 12.In this configuration of rupture of the fuse piece 2, the insulating part 3 adopts, under the bias of the spring 4, a triggered position (FIGS. 6 to 9) in which it interposes between the pads 11 and 12.

Selon l'invention, la pièce fusible 2 est constituée par un bloc de forme prédéfinie, par exemple réalisé en bismuth ou en un alliage de bismuth.According to the invention, the fuse piece 2 consists of a block of predefined shape, for example made of bismuth or of a bismuth alloy.

L'expression "bloc de forme prédéfinie" doit être ici comprise comme applicable à tout bloc de matière susceptible d'être manipulé, à température ambiante, sans précaution particulière ou d'être stocké en vrac, à température ambiante, avec d'autres blocs du même type sans pour autant subir de déformation visible.The expression "predefined block of shape" must be understood here as applicable to any block of material that can be handled at room temperature, without any particular precaution, or to be stored in bulk, at ambient temperature, with other blocks. of the same type without undergoing visible deformation.

Chacun des plots de connexion 11 et 12 et l'extrémité correspondante 21 ou 22 de la pièce fusible 2 sont dotés de moyens de retenue mécanique respectifs 51 et 52 (figures 10a à 11c) prenant typiquement, bien que non limitativement, la forme de reliefs complémentaires.Each of the connection pads 11 and 12 and the corresponding end 21 or 22 of the fuse piece 2 are provided with respective mechanical retaining means 51 and 52 (FIGS. 10a to 11c) typically, although not exclusively, in the form of reliefs complementary.

De plus, comme le montrent les figures 10a à 11c, ces moyens de retenue 51 et 52 sont conformés pour autoriser un enchâssement à force de la pièce fusible 2 dans les plots 11 et 12 par un mouvement relatif suivant une direction D3 perpendiculaire à la fois à la direction D1 d'alignement mutuel des plots 11 et 12 et à la direction D2 d'application de la force élastique F.In addition, as shown in FIGS. 10a to 11c, these retaining means 51 and 52 are shaped to allow forced embedding of the fuse piece 2 in the studs 11 and 12 by a relative movement in a direction D3 perpendicular to both in the direction D1 of mutual alignment of the pads 11 and 12 and the direction D2 of application of the elastic force F.

Dans ces conditions, le contact électrique de la pièce fusible 2 avec les plots 11 et 12 résulte au moins en partie de cet enchâssement, et n'est de préférence assuré que par ce dernier.Under these conditions, the electrical contact of the fuse piece 2 with the pads 11 and 12 results at least in part from this encasement, and is preferably provided only by the latter.

Les moyens de retenue 51 et 52, dont sont respectivement dotés les plots 11, 12 et la pièce fusible 2, présentent des surfaces d'appui respectives S1 et S2 en regard l'une de l'autre et inclinées par rapport à la direction D1 (figures 10a à 11c).The retaining means 51 and 52, which are respectively provided with the pads 11, 12 and the fuse piece 2, have respective bearing surfaces S1 and S2 opposite one another and inclined with respect to the direction D1 (Figures 10a to 11c).

En fait, ces surfaces d'appui respectives S1 et S2 sont disposées pour exercer l'une sur l'autre des forces d'appui croissantes en réponse à une traction croissante exercée entre chacun des plots 11 et 12 et la pièce fusible 2.In fact, these respective bearing surfaces S1 and S2 are arranged to exert on each other increasing bearing forces in response to increasing traction exerted between each of the pads 11 and 12 and the fuse piece 2.

Plus précisément, si les plots 11 et 12 équipant les sous-ensembles fonctionnels illustrés aux figures 10c et 11c sont sollicités par une force élastique de traction tendant à les écarter l'un de l'autre, et tendant donc à écarter chacun d'eux de la pièce fusible 2, cette force de traction sera neutralisée par la force antagoniste représentée par les appuis mutuels des surfaces S1 et S2.More specifically, if the pads 11 and 12 equipping the functional subassemblies illustrated in Figures 10c and 11c are biased by an elastic tensile force tending to separate them from each other, and therefore tending to separate each of them of the fuse piece 2, this traction force will be neutralized by the opposing force represented by the mutual support of the surfaces S1 and S2.

Selon un mode de réalisation particulièrement avantageux au plan industriel, chacun des plots 11 et 12 est formé d'un flan métallique, élastique en flexion, découpé et plié.According to a particularly advantageous embodiment at the industrial level, each of the pads 11 and 12 is formed of a metal blank, flexural elastic, cut and folded.

Par ailleurs, chacun de ces plots 11 et 12, et la pièce fusible 2 sont dimensionnés de manière que l'enchâssement de cette pièce fusible 2 dans chaque plot provoque une déformation élastique du flan constituant ce plot, le contact électrique entre la pièce fusible 2 et ce plot étant ainsi optimisé.Furthermore, each of these pads 11 and 12, and the fuse piece 2 are dimensioned so that the embedding of this fuse piece 2 in each pad causes an elastic deformation of the blank constituting this pad, the electrical contact between the fuse piece 2 and this pad is thus optimized.

Comme le montre notamment la figure 7, la pièce isolante 3 présente deux voiles 31 et 32, respectivement adjacents aux plots 11 et 12, et s'étendant dans des plans respectifs perpendiculaires à la direction D1.As shown in particular in Figure 7, the insulating part 3 has two webs 31 and 32 respectively adjacent to the pads 11 and 12, and extending in respective planes perpendicular to the direction D1.

Les bords frontaux respectifs 310 et 320 de ces voiles 31 et 32 sont en appui sur la pièce fusible 2 dans la configuration opérationnelle de celle-ci, et sont de préférence biseautés pour être relativement tranchants.The respective front edges 310 and 320 of these webs 31 and 32 bear against the fuse piece 2 in the operative configuration thereof, and are preferably bevelled to be relatively sharp.

La pièce isolante 3 peut présenter (figure 7) une cavité 30 s'étendant suivant la direction D2 d'application de la force F.The insulating part 3 may have (FIG. 7) a cavity 30 extending in the direction D2 of application of the force F.

Cette cavité est définie entre les voiles 31 et 32 et éventuellement délimitée par un troisième voile 33.This cavity is defined between the webs 31 and 32 and optionally delimited by a third sail 33.

La pièce isolante 3 présente avantageusement, suivant la troisième direction D3, une hauteur H3 supérieure à la hauteur correspondante H2 de la pièce fusible 2.The insulating part 3 advantageously has, in the third direction D3, a height H3 greater than the corresponding height H2 of the fuse piece 2.

Pour faciliter son positionnement, la pièce isolante 3 comporte par ailleurs une face de repos 34 perpendiculaire à la direction D3 et reposant sur la pièce fusible 2 dans la configuration opérationnelle de celle-ci.To facilitate its positioning, the insulating part 3 also has a rest face 34 perpendicular to the direction D3 and resting on the fuse piece 2 in the operational configuration thereof.

Il est en outre judicieux de faire en sorte que la position déclenchée de la pièce isolante 3 (figure 8) soit séparée de la position armée de cette pièce 3 (figure 5) par une course au moins égale à la distance d (figure 4) séparant les deux plots 11 et 12.It is also advisable to ensure that the triggered position of the insulating piece 3 (FIG. 8) is separated from the armed position of this piece 3 (FIG. 5) by a stroke at least equal to the distance d (FIG. 4). separating the two studs 11 and 12.

Le dispositif ainsi constitué peut être appliqué à la réalisation d'une cellule parafoudre comprenant une varistance 6. Dans une telle cellule, le plot 11 pourra être relié à une première borne d'alimentation de la varistance 6 ou constituer directement cette première borne d'alimentation.The device thus constituted can be applied to the production of a surge arrester cell comprising a varistor 6. In such a cell, the stud 11 can be connected to a first power supply terminal of the varistor 6 or directly constitute this first terminal of food.

Le plot 12 pourra quant à lui être relié à une première borne de branchement de la cellule à un réseau électrique ou constituer directement cette première borne de branchement.The stud 12 may in turn be connected to a first connection terminal of the cell to an electrical network or constitute directly this first branch terminal.

La deuxième borne d'alimentation 62 de la varistance 6 pourra alors être reliée à une deuxième borne de branchement de la cellule à un réseau électrique, ou constituer directement cette deuxième borne de branchement.The second power supply terminal 62 of the varistor 6 can then be connected to a second connection terminal of the cell to an electrical network, or directly constitute this second branch terminal.

Claims (10)

Dispositif de protection électrique comprenant au moins des premier et second plots de connexion (11, 12) alignés suivant une première direction (D1), une pièce conductrice fusible (2) présentant des première et seconde extrémités (21, 22) respectivement en contact électrique et mécanique avec les premier et second plots (11, 12), et des moyens de sollicitation (3, 4) exerçant sur la pièce fusible (2) une force élastique (F) appliquée entre les deux plots (11, 12) suivant une deuxième direction (D2) transversale à la première (D1), la pièce fusible (2) adoptant originellement une configuration opérationnelle dans laquelle elle assure une liaison électrique entre les premier et second plots (11, 12), et adoptant, sous l'effet d'une élévation de température et de la force élastique (F), une configuration finale de rupture dans laquelle la liaison électrique est rompue, caractérisé en ce que la pièce fusible (2) est constituée par un bloc de forme prédéfinie, en ce que chaque plot de connexion (11, 12) et l'extrémité (21, 22) de la pièce fusible en contact avec ce plot sont dotés de moyens de retenue mécanique respectifs (51, 52), et en ce que les moyens de retenue (51, 52) des plots (11, 12) et de la pièce fusible (2) sont conformés pour autoriser un enchâssement à force de la pièce fusible (2) dans les plots (11, 12) par un mouvement relatif suivant une troisième direction (D3) perpendiculaire aux première et deuxième directions (Dl, D2), le contact électrique de la pièce fusible (2) avec les plots (11, 12) résultant au moins partiellement de cet enchâssement.Electrical protection device comprising at least first and second connection pads (11, 12) aligned in a first direction (D1), a fusible conductive part (2) having first and second ends (21, 22) respectively in electrical contact and mechanics with the first and second pads (11, 12), and biasing means (3, 4) exerting on the fuse piece (2) an elastic force (F) applied between the two pads (11, 12) in accordance with a second direction (D2) transverse to the first (D1), the fuse piece (2) originally adopting an operational configuration in which it provides an electrical connection between the first and second pads (11, 12), and adopting, under the effect a rise in temperature and the elastic force (F), a final rupture configuration in which the electrical connection is broken, characterized in that the fuse piece (2) consists of a predefined block of shape , in that each connection pad (11, 12) and the end (21, 22) of the fuse piece in contact with this pad are provided with respective mechanical retaining means (51, 52), and in that the retaining means (51, 52) of the studs (11, 12) and of the fuse piece (2) are shaped to allow force entrapment of the fuse piece (2) in the studs (11, 12) by a relative movement in a third direction (D3) perpendicular to the first and second directions (D1, D2), the electrical contact of the fuse piece (2) with the studs (11, 12) resulting at least partially from this embedding. Dispositif de protection suivant la revendication 1, caractérisé en ce que les moyens de retenue (51, 52) des plots (11, 12) et de la pièce fusible (2) présentent des surfaces d'appui respectives (S1, S2) en regard l'une de l'autre et inclinées par rapport à la première direction (D1), ces surfaces d'appui respectives (S1, S2) étant disposées pour exercer l'une sur l'autre des forces d'appui croissantes en réponse à une traction croissante exercée entre chaque plot (11, 12) et la pièce fusible (2).Protective device according to Claim 1, characterized in that the retaining means (51, 52) of the studs (11, 12) and of the fuse piece (2) have respective bearing surfaces (S1, S2) facing each other. one of the other and inclined with respect to the first direction (D1), these respective bearing surfaces (S1, S2) being arranged to exert on each other increasing bearing forces in response to an increasing traction exerted between each stud (11, 12) and the fuse piece (2). Dispositif de protection suivant la revendication 1 ou 2, caractérisé en ce que le contact électrique de la pièce fusible (2) avec les plots (11, 12) est exclusivement assuré par l'enchâssement de la pièce fusible (2) dans les plots (11, 12).Protective device according to Claim 1 or 2, characterized in that the electrical contact of the fuse piece (2) with the pads (11, 12) is exclusively ensured by the embedding of the fuse piece (2) in the pads ( 11, 12). Dispositif de protection suivant l'une quelconque des revendications précédentes, caractérisé en ce que chaque plot (11, 12) comprend un flan métallique, élastique en flexion, découpé et plié, et en ce que ce plot (11, 12) et la pièce fusible (2) sont dimensionnés de manière que l'enchâssement de la pièce fusible (2) dans ce plot (11, 12) provoque une déformation élastique du flan constituant ce plot.Protective device according to any one of the preceding claims, characterized in that each stud (11, 12) comprises a metal blank, resilient in flexion, cut and folded, and in that this stud (11, 12) and the piece fuse (2) are dimensioned so that the embedding of the fuse piece (2) in this pad (11, 12) causes an elastic deformation of the blank constituting this pad. Dispositif de protection suivant l'une quelconque des revendications précédentes, caractérisé en ce que les moyens de sollicitation (3, 4) comprennent une pièce isolante (3) et des moyens élastiques (4) et en ce que la pièce isolante (3) est sollicitée par les moyens élastiques (4) pour adopter, dans la configuration opérationnelle de la pièce fusible (2), une position armée dans laquelle elle exerce ladite force élastique (F) sur la pièce fusible (2), et pour adopter, dans la configuration de rupture de la pièce fusible (2), une position déclenchée dans laquelle elle s'interpose entre les premier et second plots (11, 12).Protective device according to one of the preceding claims, characterized in that the biasing means (3, 4) comprise an insulating part (3) and elastic means (4) and that the insulating part (3) is biased by the elastic means (4) to adopt, in the operational configuration of the fuse piece (2), a position an army in which it exerts said elastic force (F) on the fuse piece (2), and to adopt, in the rupture configuration of the fuse piece (2), a triggered position in which it interposes between the first and second pads (11, 12). Dispositif de protection suivant l'une quelconque des revendications précédentes, caractérisé en ce que la pièce isolante (3) présente des premier et deuxième voiles (31, 32) respectivement adjacents aux premier et deuxième plots (11, 12), s'étendant dans des plans respectifs perpendiculaires à la première direction (D1), et présentant des bords frontaux (310, 320) en appui sur la pièce fusible (2) dans la configuration opérationnelle de celle-ci.Protective device according to any one of the preceding claims, characterized in that the insulating part (3) has first and second webs (31, 32) respectively adjacent to the first and second pads (11, 12), extending into respective planes perpendicular to the first direction (D1), and having front edges (310, 320) resting on the fuse piece (2) in the operational configuration thereof. Dispositif de protection suivant l'une quelconque des revendications précédentes, caractérisé en ce que la pièce isolante (3) présente une cavité (30) définie entre les premier et deuxième voiles (31, 32) et s'étendant suivant la deuxième direction (D2).Protective device according to any one of the preceding claims, characterized in that the insulating part (3) has a cavity (30) defined between the first and second webs (31, 32) and extending in the second direction (D2 ). Dispositif de protection suivant l'une quelconque des revendications précédentes, caractérisé en ce que la pièce isolante (3) présente, suivant la troisième direction (D3), une dimension (H3), ou hauteur, supérieure à la dimension correspondante (H2), ou hauteur, de la pièce fusible (2).Protective device according to any one of the preceding claims, characterized in that the insulating part (3) has, in the third direction (D3), a dimension (H3), or height, greater than the corresponding dimension (H2), or height, of the fuse piece (2). Dispositif de protection suivant l'une quelconque des revendications précédentes combinée à la revendication 5, caractérisé en ce que la position déclenchée de la pièce isolante (3) est séparée de la position armée de cette pièce (3) par une course au moins égale à la distance (d) séparant les deux plots (11, 12).Protective device according to any one of the preceding claims combined with claim 5, characterized in that the triggered position of the insulating piece (3) is separated from the armed position of this piece (3) by a stroke at least equal to the distance (d) separating the two studs (11, 12). Application d'un dispositif suivant l'une quelconque des revendications précédentes à la réalisation d'une cellule parafoudre comprenant une varistance (6), et dans laquelle le premier plot (11) est relié à une première borne d'alimentation de la varistance (6) ou la constitue, dans laquelle le second plot (12) est relié à une première borne de branchement du dispositif à un réseau électrique ou la constitue, et dans laquelle la varistance (6) comprend une deuxième borne d'alimentation (62) qui est reliée à une deuxième borne de branchement du dispositif à un réseau électrique ou qui la constitue.Application of a device according to any one of the preceding claims to the production of a surge arrester cell comprising a varistor (6), and in which the first stud (11) is connected to a first power supply terminal of the varistor ( 6) or constitutes it, in which the second pad (12) is connected to or constitutes a first connection terminal of the device to an electrical network, and in which the varistor (6) comprises a second power supply terminal (62). which is connected to a second connection terminal of the device to an electrical network or which constitutes it.
EP06290455A 2005-03-30 2006-03-21 Protection device having a crimped element biased in the switching off direction, and use of said device in a lightning arrestor Not-in-force EP1708222B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06290455T PL1708222T3 (en) 2005-03-30 2006-03-21 Protection device having a crimped element biased in the switching off direction, and use of said device in a lightning arrestor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0503101A FR2884041B1 (en) 2005-03-30 2005-03-30 ELECTRICAL PROTECTIVE DEVICE HAVING A FUSE-FUSE PIECE SOLICITED AT BREAKAGE, AND APPLICATION TO PARAFOUDRED CELLS

Publications (3)

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EP1708222A2 true EP1708222A2 (en) 2006-10-04
EP1708222A3 EP1708222A3 (en) 2007-08-29
EP1708222B1 EP1708222B1 (en) 2011-05-04

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EP06290455A Not-in-force EP1708222B1 (en) 2005-03-30 2006-03-21 Protection device having a crimped element biased in the switching off direction, and use of said device in a lightning arrestor

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EP (1) EP1708222B1 (en)
AT (1) ATE508468T1 (en)
DE (1) DE602006021658D1 (en)
FR (1) FR2884041B1 (en)
PL (1) PL1708222T3 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE481459A (en) *
US2149773A (en) * 1937-10-25 1939-03-07 George W Huntley Safety plug
US4451814A (en) * 1982-06-14 1984-05-29 Fasco Controls Corporation Non-resettable thermal fuse
JPH0831299A (en) * 1994-07-20 1996-02-02 Daito Tsushinki Kk Surge absorber
US6430019B1 (en) * 1998-06-08 2002-08-06 Ferraz S.A. Circuit protection device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE481459A (en) *
US2149773A (en) * 1937-10-25 1939-03-07 George W Huntley Safety plug
US4451814A (en) * 1982-06-14 1984-05-29 Fasco Controls Corporation Non-resettable thermal fuse
JPH0831299A (en) * 1994-07-20 1996-02-02 Daito Tsushinki Kk Surge absorber
US6430019B1 (en) * 1998-06-08 2002-08-06 Ferraz S.A. Circuit protection device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 06, 28 juin 1996 (1996-06-28) & JP 08 031299 A (DAITO TSUSHINKI KK), 2 février 1996 (1996-02-02) *

Also Published As

Publication number Publication date
EP1708222A3 (en) 2007-08-29
EP1708222B1 (en) 2011-05-04
FR2884041B1 (en) 2007-06-15
PL1708222T3 (en) 2011-10-31
DE602006021658D1 (en) 2011-06-16
FR2884041A1 (en) 2006-10-06
ATE508468T1 (en) 2011-05-15

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