EP0094859A1 - Test button for a differential trip device - Google Patents

Test button for a differential trip device Download PDF

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Publication number
EP0094859A1
EP0094859A1 EP83400874A EP83400874A EP0094859A1 EP 0094859 A1 EP0094859 A1 EP 0094859A1 EP 83400874 A EP83400874 A EP 83400874A EP 83400874 A EP83400874 A EP 83400874A EP 0094859 A1 EP0094859 A1 EP 0094859A1
Authority
EP
European Patent Office
Prior art keywords
push button
button
recess
elastic blade
differential
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
EP83400874A
Other languages
German (de)
French (fr)
Other versions
EP0094859B1 (en
Inventor
Patrick De Robertis
Louis-Paul Cotte
Patrick Rousset
Jacques Perret
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin 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 Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0094859A1 publication Critical patent/EP0094859A1/en
Application granted granted Critical
Publication of EP0094859B1 publication Critical patent/EP0094859B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
    • H01H2083/045—Auxiliary switch opening testing circuit in synchronism with the main circuit

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Abstract

1. Differential trip device having a test device actuated by a push button (10) for simulating a differential fault, comprising a switch with a movable contact shaped as a spring blade (32) and moved towards the closed position by the push button (10), characterized in that said spring blade (32) is housed into a hole (20) extending longitudinally inside the push button (10) in the push direction of the button, that the spring blade (32) is retracted inside said hole (20) in the rest position of said button, interposed between the hole (20) bottom (28) and a fixed abutment (36), and that depressing of the button (10) causes the coming out of said hole (20) of the spring blade (32) and to come in the closed position.

Description

L'invention est relative à un dispositif de déclenchement différentiel selon le préambule de la revendication 1.The invention relates to a differential tripping device according to the preamble of claim 1.

Un dispositif de déclenchement du genre mentionné, par exemple décrit dans le brevet français N° 2.437.692, comporte un circuit de test actionné par l'enfoncement d'un bouton poussoir. En enfonçant le bouton poussoir on ferme une dérivation comprenant une résistance de contrôle qui shunte le transformateur de courant différentiel et simule un défaut différentiel. Des moyens de sécurité limitent la durée de fermeture de l'interrupteur pour éviter une destruction de la résistance. Les dispositifs connus peuvent être à l'origine de déclenchements intempestifs, notamment lors d'une fermeture intempestive, par exemple due à un amorçage entre les contacts de l'interrupteur du circuit de test.A triggering device of the kind mentioned, for example described in French patent No. 2,437,692, comprises a test circuit actuated by the depressing of a push button. By pressing the push button, a bypass is closed including a control resistor which shunts the differential current transformer and simulates a differential fault. Safety means limit the duration of closure of the switch to avoid destruction of the resistance. Known devices can be the cause of untimely tripping, in particular during an untimely closing, for example due to priming between the contacts of the switch of the test circuit.

La présente invention a pour but de remédier à cet inconvénient en mettant en oeuvre les particularités mentionnées dans les revendications.The object of the present invention is to remedy this drawback by implementing the features mentioned in the claims.

En rétractant la lame élastique constituant le contact mobile à l'intérieur du bouton poussoir en matière isolante les risques d'amorçage entre les contacts de l'interrupteur de test sont sensiblement réduits oulet pratiquement exclus. La lame élastique s'étend longitudinalement à l'intérieur d'un évidement allongé ménagé dans le bouton poussoir en étant intercalée entre une butée fixe et le fond de l'évidement de telle manière que l'enfoncement du bouton poussoir,se traduisant par un rapprochement du fond de l'évidement et de la butée, provoque la déformation de la lame élastique et une venue en saillie de l'extrémité libre de cette lame. Cette extrémité libre est avantageusement recourbée pour faciliter la déformation et la sortie à travers une fente ménagée dans le bouton poussoir au voisinage du fond de l'évidement. La lame élastique peut être agencée en ressort de rappel ou être associée à un ressort de rappel logé à l'intérieur de l'évidement du bouton poussoir. L'invention sera décrite par la suite en étant appliquée à un dispositif de déclenchement du type décrit dans le brevet français précité, mais il est clair qu'elle est applicable à tout dispositif de test d'un disjoncteur différentiel.By retracting the elastic blade constituting the movable contact inside the push button made of insulating material, the risks of priming between the contacts of the test switch are substantially reduced or practically excluded. The elastic blade extends longitudinally inside an elongated recess formed in the push button by being interposed between a fixed stop and the bottom of the recess so that the pushing of the push button, resulting in a approximation of the bottom of the recess and the stop, causes the elastic blade to deform and protrude from the free end of this blade. This free end is advantageously curved to facilitate deformation and exit through a slot in the push button in the vicinity of the bottom of the recess. The elastic blade can be arranged as a return spring or be associated with a return spring housed inside the recess of the push button. The invention will be described below by being applied to a tripping device of the type described in the aforementioned French patent, but it is clear that it is applicable to any device for testing a differential circuit breaker.

D'autres caractéristiques et avantages ressortiront plus clairement de la description qui va suivre d'un mode de mise en oeuvre de l'invention, donné à titre d'exemple non limitatif et représenté aux dessins annexés, dans lesquels:

  • la figure 1 est une vue schématique en coupe d'un mécanisme d'un bloc différentiel connu, équipé d'un bouton poussoir de test;
  • les figures 2 et 3 sont des vues en coupe, à échelle agrandie, montrant un bouton poussoir de test selon l'invention, respectivement en position ouvert et en position enfoncé.
Other characteristics and advantages will emerge more clearly from the following description of an embodiment of the invention, given by way of nonlimiting example and shown in the appended drawings, in which:
  • Figure 1 is a schematic sectional view of a mechanism of a known differential unit, equipped with a test push button;
  • Figures 2 and 3 are sectional views, on an enlarged scale, showing a test push button according to the invention, respectively in the open position and in the depressed position.

La figure 1 correspond à la figure 6 du brevet français N° 2.437.692, auquel on se référera avantageusement pour de plus amples détails, et il suffit de rappeler que le bloc différentiel comporte un bouton test 10 dont l'enfoncement permet de simuler un défaut différentiel par insertion d'une résistance électrique d'une manière bien connue des spécialistes. Le bouton test 10 porte un contact mobile 12 venant au contact,en position enfoncé du bouton 10,d'un contact semi-fixe 14 constitué par l'extrémité d'un ressort en spirale 16 en appui d'une butée mobile 18. L'extrémité 14 accompagne la butée 18 dans son mouvement et l'ensemble est agencé de telle manière que les contacts 12, 14 ne peuvent être fermés qu'à la double condition d'un enfoncement du bouton 10 et d'un pivotement de la butée 48 dans une position extrême correspondant à la fermeture du disjoncteur accouplé au bloc différentiel. Lors d'un test de fonctionnement par enfoncement du bouton poussoir 10, le contact 14 s'efface dès l'ouverture du disjoncteur pour limiter la durée d'alimentation de la résistance de shun- tage. De tels dispositifs de test sont bien connus, mais peuvent être à l'origine de déclenchements intempestifs, la distance d'isolement entre les contacts 12, 14 étant relativement réduite.Figure 1 corresponds to Figure 6 of French Patent No. 2,437,692, which will advantageously be referred to for further details, and it suffices to recall that the differential unit comprises a test button 10, the depressing of which makes it possible to simulate a differential fault by insertion of an electrical resistance in a manner well known to specialists. The test button 10 carries a movable contact 12 coming into contact, in the depressed position of the button 10, of a semi-fixed contact 14 formed by the end of a spiral spring 16 in support of a movable stop 18. L end 14 accompanies the stop 18 in its movement and the assembly is arranged in such a way that the contacts 12, 14 can only be closed on the double condition of pressing the button 10 and pivoting the stop 48 in an extreme position corresponding to the closing of the circuit breaker coupled to the differential unit. During a functional test by pressing the push button 10, contact 14 is erased when the circuit breaker is opened to limit the duration of supply of the shunt resistor. Such test devices are well known, but can be the cause of nuisance trips, the isolation distance between the contacts 12, 14 being relatively small.

En se référant aux figures 2 et 3, qui représentent l'interrupteur test selon l'invention, on voit que le bouton poussoir 10 présente dans sa partie inférieure un évidement longitudinal 20 ouvert à sa base 22. Dans l'exemple représenté sur les figures, le bouton poussoir 10 est monté à coulissement en appui d'une face 24 du boîtier du mécanisme et l'évidement 20 est ouvert du côté de la face 24, mais il est clair que l'évidement 20 peut être entièrement fermé sur tous les côtés. L'évidement 20 communique avec une fente 26 ménagée sur la face du bouton poussoir 10 en regard du contact 14 au voisinage du fond 28 de l'évidement 20. La fente 26 est confinée par un bec de guidage 30 dont la fonction ressortira de la description ci-dessous. Le contact mobile actionné par le bouton poussoir 10 est constitué par une lame élastique 32 s'étendant longitudinalement à l'intérieur de l'évidement 20 en étant fixée à sa base par une partie repliée 34 à un appui fixe 36 du boi- tier. L'extrémité opposée 38 de la lame élastique 32 est recourbée le long du bec 30 pour pénétrer dans la fente 26. Un ressort spirale de rappel 40 est intercalé entre le bec 30 et la butée fixe 36 pour solliciter le bouton poussoir 10 en position de repos et d'ouverture de l'interrupteur test. L'ensemble est agencé de telle manière qu'en position d'ouverture de l'interrupteur test l'extrémité 38 de la lame 32 constituant le contact mobile de l'interrupteur est rétractée à l'intérieur de l'évidement 20 empêchant tout risque d'amorçage entre les contacts 14, 38.Referring to Figures 2 and 3, which show the test switch according to the invention, we see that the push button 10 has in its lower part a longitudinal recess 20 open at its base 22. In the example shown in the figures , the push button 10 is slidably mounted in abutment on one face 24 of the mechanism housing and the recess 20 is open on the side of the face 24, but it is clear that the recess 20 can be fully closed on all sides. The recess 20 communicates with a slot 26 formed on the face of the push button 10 opposite the contact 14 in the vicinity of the bottom 28 of the recess 20. The slot 26 is confined by a guide spout 30 whose function will emerge from the description below. The movable contact actuated by the push button 10 is constituted by an elastic blade 32 extending longitudinally inside the recess 20 while being fixed at its base by a folded part 34 to a fixed support 36 of the housing. The opposite end 38 of the elastic blade 32 is curved along the spout 30 to penetrate the slot 26. A spiral return spring 40 is interposed between the spout 30 and the fixed stop 36 to urge the push button 10 in the position of rest and opening of the test switch. The assembly is arranged in such a way that in the open position of the test switch the end 38 of the blade 32 constituting the movable contact of the switch is retracted inside the recess 20 preventing any risk between the contacts 14, 38.

La figure 3 représente l'interrupteur en position de fermeture et l'on voit que lors de l'enfoncement du bouton poussoir 10 la lame élastique 32 en appui du fond 28 est repliée pour faire saillir l'extrémité 38 qui vient au contact du contact 14. Là déformation de la lame élastique 32 est facilitée et guidée par la forme arrondie du bec 30. Lors de la flexion de la lame élastique 32, la partie rectiligne prend appui sur la face adjacente 24, de manière à éviter les risques de flambage. La partie rectiligne de la lame élastique 32 peut également être guidée par tout moyen approprié. Le ressort de rappel 40 repousse le bouton poussoir 10 en position de repos et la lame élastique 32 revient automatiquement par sa propre élasticité et éventuellement par l'action du bec 30 en sa position d'origine de rétraction. Il est inutile de noter que l'ensemble est particulièrement simple et que l'encombrement de l'interrupteur selon l'invention est comparable à celui des interrupteurs conventionnels.FIG. 3 represents the switch in the closed position and it can be seen that when the push button 10 is pressed the elastic blade 32 in support of the bottom 28 is re folded to project the end 38 which comes into contact with the contact 14. The deformation of the elastic blade 32 is facilitated and guided by the rounded shape of the spout 30. When the elastic blade 32 flexes, the rectilinear part is supported on the adjacent face 24, so as to avoid the risk of buckling. The rectilinear part of the elastic blade 32 can also be guided by any suitable means. The return spring 40 pushes the push button 10 in the rest position and the elastic blade 32 automatically returns by its own elasticity and possibly by the action of the spout 30 in its original retraction position. It is needless to note that the assembly is particularly simple and that the size of the switch according to the invention is comparable to that of conventional switches.

Il est clair que le dispositif de contact à lame élastique rétractable peut être utilisé avec des interrupteurs d'un autre type, par exemple dans lesquels l'extrémité 38 viendrait au contact d'une plage de contact fixe ou s'introduirait dans une pince de contact.It is clear that the contact device with retractable elastic blade can be used with switches of another type, for example in which the end 38 would come into contact with a fixed contact pad or be introduced into a clamp. contact.

L'invention n'est bien entendu nullement limitée au mode de mise en oeuvre plus particulièrement décrit..The invention is of course in no way limited to the mode of implementation more particularly described.

Claims (6)

1. Dispositif de déclenchement différentiel ayant un dispositif d'essai actionné par un bouton poussoir (10) pour simuler un défaut différentiel comprenant un interrupteur à contact mobile (38) déplacé en position de fermeture par enfoncement du bouton poussoir, caractérisé par le fait que le contact mobile (38) est constitué par une lame élastique (32), disposée dans un évidement (20) ménagé dans le bouton poussoir (10) en étant rétractée à l'intérieur de ce bouton en position de repos de ce dernier, ladite lame (32) venant par déformation élastique en position de saillie au contact du contact fixe (14) de l'interrupteur par enfoncement du bouton poussoir.1. Differential trip device having a test device actuated by a push button (10) to simulate a differential fault comprising a movable contact switch (38) moved to the closed position by depressing the push button, characterized in that the movable contact (38) consists of an elastic blade (32), disposed in a recess (20) formed in the push button (10) while being retracted inside this button in the rest position of the latter, said blade (32) coming by elastic deformation in the projecting position in contact with the fixed contact (14) of the switch by depressing the push button. 2. Dispositif selon la revendication 1, caractérisé en ce que ledit évidement (20) s'étend longitudinalement à l'intérieur du bouton poussoir (10) selon la direction d'enfoncement du bouton, la lame (32) élastique logée longitudinalement dans l'évidement (20) étant intercalée entre le fond (28) de l'évidement (20) et une butée fixe (36) pour être déformée et poussée en position de saillie par rapprochement dudit fond (28) et de la butée (36) lors d'un enfoncement du bouton (10).2. Device according to claim 1, characterized in that said recess (20) extends longitudinally inside the push button (10) in the direction in which the button is pressed, the elastic blade (32) housed longitudinally in the recess (20) being interposed between the bottom (28) of the recess (20) and a fixed stop (36) to be deformed and pushed into the projecting position by bringing said bottom (28) and the stop (36) when the button (10) is pressed. 3. Dispositif selon la revendication 2, caractérisé en ce que l'extrémité (38) de la lame élastique (32) susceptible de venir en saillie est recourbée latéralement.3. Device according to claim 2, characterized in that the end (38) of the elastic blade (32) capable of projecting is curved laterally. 4. Dispositif selon la revendication 3, caractérisé en ce que l'extrémité recourbée (38) de la lame élastique (32) traverse une fente (26) latérale ménagée dans le fond (28) de l'évidement (20) pour venir en saillie latérale du bouton poussoir (10) en position enfoncée de ce dernier.4. Device according to claim 3, characterized in that the curved end (38) of the elastic blade (32) passes through a lateral slot (26) formed in the bottom (28) of the recess (20) to come into lateral projection of the push button (10) in the depressed position of the latter. 5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un ressort de rappel (40) du bouton poussoir (10) est logé dans ledit évidement (20).5. Device according to any one of the preceding claims, characterized in that a return spring (40) of the push button (10) is housed in said recess (20). 6. Dispositif selon la revendication 4, caractérisé en ce que la fente (26) est délimitée du côté opposé au fond (28) par un bec arrondi (30) de guidage.6. Device according to claim 4, characterized in that the slot (26) is delimited on the side opposite the bottom (28) by a rounded guide beak (30).
EP19830400874 1982-05-11 1983-05-02 Test button for a differential trip device Expired EP0094859B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8208318 1982-05-11
FR8208318A FR2526995A1 (en) 1982-05-11 1982-05-11 TEST BUTTON FOR A DIFFERENTIAL TRIGGER

Publications (2)

Publication Number Publication Date
EP0094859A1 true EP0094859A1 (en) 1983-11-23
EP0094859B1 EP0094859B1 (en) 1985-12-18

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ID=9273986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830400874 Expired EP0094859B1 (en) 1982-05-11 1983-05-02 Test button for a differential trip device

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EP (1) EP0094859B1 (en)
DE (1) DE3361545D1 (en)
ES (1) ES8403239A1 (en)
FR (1) FR2526995A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1492140A1 (en) * 2003-06-27 2004-12-29 Siemens Aktiengesellschaft Cricuit breaker with test button
EP1562212A2 (en) * 2004-02-06 2005-08-10 Siemens Aktiengesellschaft Earth fault currents protection device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789268A (en) * 1972-12-29 1974-01-29 Gen Electric Miniature circuit breaker with electronic tripping means
FR2241868A1 (en) * 1973-08-20 1975-03-21 Merlin Gerin
FR2437692A1 (en) * 1978-09-28 1980-04-25 Merlin Gerin Manually operated circuit breaker with overload cut=out - has earth fault current overload device and reset units as separate components which may be put together later

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789268A (en) * 1972-12-29 1974-01-29 Gen Electric Miniature circuit breaker with electronic tripping means
FR2241868A1 (en) * 1973-08-20 1975-03-21 Merlin Gerin
FR2437692A1 (en) * 1978-09-28 1980-04-25 Merlin Gerin Manually operated circuit breaker with overload cut=out - has earth fault current overload device and reset units as separate components which may be put together later

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1492140A1 (en) * 2003-06-27 2004-12-29 Siemens Aktiengesellschaft Cricuit breaker with test button
EP1562212A2 (en) * 2004-02-06 2005-08-10 Siemens Aktiengesellschaft Earth fault currents protection device
EP1562212B1 (en) * 2004-02-06 2009-08-26 Siemens Aktiengesellschaft Earth fault currents protection device

Also Published As

Publication number Publication date
FR2526995B1 (en) 1985-02-08
EP0094859B1 (en) 1985-12-18
ES522180A0 (en) 1984-03-16
ES8403239A1 (en) 1984-03-16
DE3361545D1 (en) 1986-01-30
FR2526995A1 (en) 1983-11-18

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