EP0456586B1 - Test circuit for a differential tripping device - Google Patents

Test circuit for a differential tripping device Download PDF

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Publication number
EP0456586B1
EP0456586B1 EP91420141A EP91420141A EP0456586B1 EP 0456586 B1 EP0456586 B1 EP 0456586B1 EP 91420141 A EP91420141 A EP 91420141A EP 91420141 A EP91420141 A EP 91420141A EP 0456586 B1 EP0456586 B1 EP 0456586B1
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EP
European Patent Office
Prior art keywords
test
switch
strands
strand
circuit
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EP91420141A
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German (de)
French (fr)
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EP0456586A1 (en
Inventor
Alain Bruno
Michel Lazareth
Noel Lecorre
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Merlin Gerin SA
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Merlin Gerin SA
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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

Definitions

  • Document FR-A-2,489,587 discloses a test circuit in which each of the conductive strands of the test switch and of the protective switch belongs to a separate spring. This results in a positioning of the two springs on two offset axes, with cooperation of the two strands either with the opposite terminals of the resistor, or with a metal finger.
  • the two springs are at different potentials, which imposes an appropriate isolation distance between the two springs, to the detriment of the bulk.
  • the two springs are at the same potential of the phase circuit, but the presence of the metal finger for placing the two switches in series complicates the mounting of the test circuit in the circuit breaker.
  • the object of the invention consists in simplifying the production of a test circuit for a differential trip device.
  • the test circuit according to the invention is characterized in that the first and second strands are part of the same double spring of conductive material, having two helical windings mounted coaxially on a common axis, and connected to each other by an intermediate link bearing on a fixed support of the housing.
  • Each winding of the double spring has a predetermined number of turns to define the elasticity and the specific restoring force of the corresponding strand.
  • the two strands of the spring extend in the same direction, and parallel to each other in a direction perpendicular to the axis, the interval between the two juxtaposed strands corresponding to the total length of the two windings taken along of the axis.
  • the elasticity of the double spring urges the first and second strands in the same pivoting direction, to ensure respectively the recall of the test button after opening the test switch, and the opening of the protective switch after differential triggering .
  • the presence of a double spring in the test circuit facilitates the assembly and manufacturing management of the differential trip device.
  • a single-pole neutral neutral circuit breaker 10 passing through is housed in an insulating casing 12 subdivided by a wall 14 for separation into two juxtaposed compartments.
  • the interior of the first compartment 16 is visible in FIG. 2, and includes a differential protection device 18 and the neutral circuit 20 passing, the latter being connected to a pair of terminals 22,24 for input and output of neutral. .
  • the second compartment serves as a housing for the phase circuit 26 comprising a pair of phase contacts 28, 30, a first control mechanism 32 piloted by a magnetothermal trip unit with bimetallic strip 34 and coil 36, and a pair of terminals 38.40 d 'phase input and output.
  • the first mechanism 32 can be of the type described in document FR-A-2,616,583.
  • the differential protection device 18 comprises a differential transformer 42 with toroid 44 having primary phase 45 and neutral windings 46, a measurement winding (not shown) connected to a trigger relay 48, and a second trigger mechanism 50 controlled by the relay 48 and a lever 52.
  • the second mechanism can be of the type described in the document FR-A-2.628.262.
  • the two mechanisms 32.50 are interconnected by mechanical links, authorizing an automatic tripping function of the first mechanism 32 when a differential tripping order is issued by the relay 48, and an automatic resetting function of the relay 48 by the first mechanism 32 after the differential triggering operation.
  • a test circuit 54 makes it possible to simulate a joint leakage current to cause a trip differential forced by the relay 48.
  • test button 56 intended to insert a test resistance 58 between two points 59,61 of different potentials of the phase circuit 26 and the neutral circuit 20. This insertion of the resistance 58 s operates by means of a test switch 60 actuated by the test button 56, and of a protection switch 62 associated with a pivoting transmission part 64 pivotally mounted on an axis 65 of the second mechanism 50.
  • the test circuit 54 is equipped with a double spring 66 of conductive material, having two helical windings 68.70 mounted coaxially on a common axis 71 secured to the wall 14 of the insulating housing 12.
  • the winding 68 is extended by a first elastic strand 72 of the test switch 60, while the winding 70 has a second elastic strand 74 of the protective switch 62.
  • the two strands 72,74 extend substantially parallel to each other on the same side of the axis 71, and in a direction perpendicular to the axis 71.
  • connection 76 common intermediate in the form of a half-loop bearing on a fixed support 78 of the housing 12 at a point situated on the same side of the strands 72, 74 relative to the axis 71.
  • the elasticity of the first strand 72 of the spring 66 urges the test button 56 towards the rest position, causing the opening of the test switch 60 (solid lines in FIG. 1).
  • the depressing of the test button 56 in the direction of the arrow F1 in FIG. 2 directly drives the first strand 72 towards the test position (dotted line) to come into contact with a terminal of the resistor 58.
  • the switch d test 60 remains permanently closed in the depressed position of test button 56.
  • the other terminal of the resistor is permanently connected to point 61 of neutral circuit 20.
  • the transmission part 64 cooperates with the second strand 74 of the spring 66 to keep the protective switch 62 closed (in solid lines in FIG. 1). In this position, the end of the second strand 74 is supported on an electrode 80 connected to point 59 of the phase circuit by a connecting conductor 82.
  • the circuit breaker 10 opens, and the transmission part 64 pivots around the axis 65 in a trigonometric direction (arrow F2 in FIG. 1) to authorize the displacement of the second strand 74 towards the dotted position, corresponding to the opening of the protective switch 62.
  • the two elementary strands 72,74 of the conductive spring 66 constitute the respective movable contacts of the switches 60,62 of the test circuit 54, the elasticity of each strand 72,74 being a function of the number of turns of the winding 68, 70 correspondent.
  • the first strand 72 is shaped into test contact of the switch d 'test 60, and as a return member of the test button 56 to the rest position.
  • the second strand 74 is arranged in self-interrupting contact of the protective switch 62, authorizing the automatic interruption of the test circuit 54 after differential tripping, even if the test switch 60 remains closed during prolonged holding of the button test 56 in the depressed position.
  • the elasticity of the spring 66 urges the two elementary strands 72,74 in the same direction of pivoting thanks to the reaction of the intermediate link 76 on the fixed support 78.
  • the windings 68.70 can have a different number of turns depending on the requirement of the specific restoring forces of the strands 72.74.
  • test switch 60 When the circuit breaker 10 is tripped, the test switch 60 is open, and the protection switch closed. Test circuit 54 is permanently interrupted, and no current flows in resistor 58 and in spring 66. The two windings 68, 70 of the latter are found at the potential of point 59 associated with the phase circuit.
  • test button 56 To perform a differential test, simply press the test button 56 in the direction of the arrow F1, which closes the test switch 60, and activates the test circuit 54 by the potential difference present between the points 59 and 61. The leakage current passing through the resistor 58 is detected by the toroid 44, causing a differential trip by the relay 48. The test circuit 54 is then interrupted by automatic opening of the protection switch 62. The release of the test button 56 causes it to return to the rest position under the elastic effect of the first strand 72.
  • the second mechanism 50 is reset by pivoting the handle 52 to the right (FIG. 2) causing the protective switch 62 to close again.
  • test circuit 54 is also applicable to a modular differential circuit breaker with neutral cut, and to a one-piece differential switch. In the latter case, the differential protection device relay acts directly on the switch control mechanism.

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  • Emergency Protection Circuit Devices (AREA)
  • Investigating Or Analysing Biological Materials (AREA)

Abstract

The test circuit (54) of a circuit-breaker with differential trip unit includes a first conducting strand (72) shaped as a test contact for a test switch, and as an elastic return element for the test button (56), and a second conducting strand (74) configured as a self-cutting contact for a protective switch (62) cooperating with a transmission component (64) of the mechanism (50). The two strands (72, 74) form part of a double spring (66) having two helical windings (68, 70) fitted coaxially on a common spindle (71) and connected to one another by an intermediate link (76) bearing on a support (78) of the casing (12). <IMAGE>

Description

L'invention est relative à un circuit test pour un déclencheur différentiel d'un appareil électrique à protection différentielle, notamment un disjoncteur ou un interrupteur, comprenant:

  • une résistance d'essai connectée en série avec un interrupteur d'essai, et un interrupteur de protection entre deux points de potentiels différents,
  • un bouton test susceptible d'occuper une position de test pour fermer l'interrupteur d'essai,
  • un premier brin conducteur conformé en contact test de l'interrupteur d'essai, et un organe élastique de rappel du bouton test vers une position de repos,
  • et un deuxième brin conducteur agencé en contact d'autocoupure de l'interrupteur de protection coopérant avec une pièce de transmission du mécanisme de commande du déclencheur différentiel.
The invention relates to a test circuit for a differential trip device of an electrical device with differential protection, in particular a circuit breaker or a switch, comprising:
  • a test resistor connected in series with a test switch, and a protection switch between two points of different potentials,
  • a test button capable of occupying a test position to close the test switch,
  • a first conductive strand shaped as test contact of the test switch, and an elastic member for returning the test button to a rest position,
  • and a second conductive strand arranged in self-breaking contact of the protective switch cooperating with a transmission part of the control mechanism of the differential trip device.

Le document FR-A-2.489.587 divulgue un circuit test dans lequel chacun des brins conducteurs de l'interrupteur d'essai et de l'interrupteur de protection appartient à un ressort distinct. Il en résulte un positionnement des deux ressorts sur deux axes décalés, avec coopération des deux brins soit avec les bornes opposées de la résistance, soit avec un doigt métallique. Dans le premier cas, les deux ressorts se trouvent à des potentiels différents, ce qui impose une distance d'isolement appropriée entre les deux ressorts, au détriment de l'encombrement. Dans le deuxième cas, les deux ressorts sont à un même potentiel du circuit de phase, mais la présence du doigt métallique pour la mise en série des deux interrupteurs complique le montage du circuit test dans le disjoncteur.Document FR-A-2,489,587 discloses a test circuit in which each of the conductive strands of the test switch and of the protective switch belongs to a separate spring. This results in a positioning of the two springs on two offset axes, with cooperation of the two strands either with the opposite terminals of the resistor, or with a metal finger. In the first case, the two springs are at different potentials, which imposes an appropriate isolation distance between the two springs, to the detriment of the bulk. In the second case, the two springs are at the same potential of the phase circuit, but the presence of the metal finger for placing the two switches in series complicates the mounting of the test circuit in the circuit breaker.

L'objet de l'invention consiste à simplifier la réalisation d'un circuit test d'un déclencheur différentiel.The object of the invention consists in simplifying the production of a test circuit for a differential trip device.

Le circuit test selon l'invention est caractérisé en ce que les premier et deuxième brins font partie d'un même ressort double en matériau conducteur,ayant deux enroulements hélicoïdaux montés coaxialement sur un axe commun, et reliés l'un à l'autre par une liaison intermédiaire prenant appui sur un support fixe du boîtier.The test circuit according to the invention is characterized in that the first and second strands are part of the same double spring of conductive material, having two helical windings mounted coaxially on a common axis, and connected to each other by an intermediate link bearing on a fixed support of the housing.

Chaque enroulement du ressort double comporte un nombre prédéterminé de spires pour définir l'élasticité et la force de rappel spécifique du brin correspondant.Each winding of the double spring has a predetermined number of turns to define the elasticity and the specific restoring force of the corresponding strand.

Les deux brins du ressort s'étendent dans le même sens, et parallèlement l'un à l'autre selon une direction perpendiculaire à l'axe, l'intervalle entre les deux brins juxtaposés correspondant à la longueur totale des deux enroulements prise le long de l'axe.The two strands of the spring extend in the same direction, and parallel to each other in a direction perpendicular to the axis, the interval between the two juxtaposed strands corresponding to the total length of the two windings taken along of the axis.

L'élasticité du ressort double sollicite les premier et deuxième brins dans un même sens de pivotement, pour assurer respectivement le rappel du bouton test après ouverture de l'interrupteur d'essai, et l'ouverture de l'interrupteur de protection après déclenchement différentiel.The elasticity of the double spring urges the first and second strands in the same pivoting direction, to ensure respectively the recall of the test button after opening the test switch, and the opening of the protective switch after differential triggering .

La présence d'un ressort double dans le circuit test facilite le montage et la gestion de fabrication du déclencheur différentiel.The presence of a double spring in the test circuit facilitates the assembly and manufacturing management of the differential trip device.

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

  • la figure 1 est une vue schématique d'un disjoncteur différentiel unipolaire et neutre passant, équipé d'un circuit test selon l'invention;
  • la figure 2 montre une vue en élévation du dispositif de protection différentielle du disjoncteur, le bouton test étant représenté en position de repos, et le disjoncteur étant enclenché.
Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention, given by way of example and shown in the appended drawings, in which:
  • Figure 1 is a schematic view of a single pole neutral neutral circuit breaker, fitted with a circuit test according to the invention;
  • Figure 2 shows an elevational view of the differential protection device of the circuit breaker, the test button being shown in the rest position, and the circuit breaker being engaged.

En référence aux figures 1 et 2, un disjoncteur différentiel 10 unipolaire et neutre passant est logé dans un boîtier 12 isolant subdivisé par une paroi 14 de séparation en deux compartiments juxtaposés. L'intérieur du premier compartiment 16 est visible sur la figure 2, et comporte un dispositif de protection différentielle 18 et le circuit de neutre 20 passant, ce dernier étant raccordé à une paire de bornes 22,24 d'entrée et de sortie de neutre.With reference to FIGS. 1 and 2, a single-pole neutral neutral circuit breaker 10 passing through is housed in an insulating casing 12 subdivided by a wall 14 for separation into two juxtaposed compartments. The interior of the first compartment 16 is visible in FIG. 2, and includes a differential protection device 18 and the neutral circuit 20 passing, the latter being connected to a pair of terminals 22,24 for input and output of neutral. .

Le deuxième compartiment sert de logement au circuit de phase 26 comprenant une paire de contacts 28,30 de phase, un premier mécanisme 32 de commande piloté par un déclencheur magnétothermique à bilame 34 et à bobine 36, et une paire de bornes 38,40 d'entrée et de sortie de phase. Le premier mécanisme 32 peut être du type décrit dans le document FR-A-2.616.583.The second compartment serves as a housing for the phase circuit 26 comprising a pair of phase contacts 28, 30, a first control mechanism 32 piloted by a magnetothermal trip unit with bimetallic strip 34 and coil 36, and a pair of terminals 38.40 d 'phase input and output. The first mechanism 32 can be of the type described in document FR-A-2,616,583.

Le dispositif de protection différentielle 18 comporte un transformateur différentiel 42 à tore 44 ayant des enroulements primaires de phase 45 et de neutre 46, un enroulement de mesure (non représenté) connecté à un relais 48 de déclenchement, et un deuxième mécanisme 50 déclencheur piloté par le relais 48 et une manette 52. Le deuxième mécanisme peut être du type décrit dans le document FR-A-2.628.262. Les deux mécanismes 32,50 sont interconnectés par des liaisons mécaniques, autorisant une fonction de déclenchement automatique du premier mécanisme 32 lors de l'émission d'un ordre de déclenchement différentiel par le relais 48, et une fonction de réarmement automatique du relais 48 par le premier mécanisme 32 après la manoeuvre de déclenchement différentiel. Un circuit test 54 permet de simuler un courant de fuite articifiel pour provoquer un déclenchement différentiel forcé par le relais 48. Il comprend un bouton test 56 destiné à insérer une résistance 58 d'essai entre deux points 59,61 de potentiels différents du circuit de phase 26 et du circuit de neutre 20. Cette insertion de la résistance 58 s'opère au moyen d'un interrupteur d'essai 60 actionné par le bouton test 56, et d'un interrupteur de protection 62 associé à un pièce 64 pivotante de transmission montée à pivotement sur un axe 65 du deuxième mécanisme 50.The differential protection device 18 comprises a differential transformer 42 with toroid 44 having primary phase 45 and neutral windings 46, a measurement winding (not shown) connected to a trigger relay 48, and a second trigger mechanism 50 controlled by the relay 48 and a lever 52. The second mechanism can be of the type described in the document FR-A-2.628.262. The two mechanisms 32.50 are interconnected by mechanical links, authorizing an automatic tripping function of the first mechanism 32 when a differential tripping order is issued by the relay 48, and an automatic resetting function of the relay 48 by the first mechanism 32 after the differential triggering operation. A test circuit 54 makes it possible to simulate a joint leakage current to cause a trip differential forced by the relay 48. It includes a test button 56 intended to insert a test resistance 58 between two points 59,61 of different potentials of the phase circuit 26 and the neutral circuit 20. This insertion of the resistance 58 s operates by means of a test switch 60 actuated by the test button 56, and of a protection switch 62 associated with a pivoting transmission part 64 pivotally mounted on an axis 65 of the second mechanism 50.

Selon l'invention, le circuit test 54 est équipé d'un ressort 66 double en matériau conducteur, ayant deux enroulements 68,70 hélicoïdaux montés coaxialement sur un axe 71 commun solidaire de la paroi 14 du boîtier 12 isolant. L'enroulement 68 est prolongé par un premier brin 72 élastique de l'interrupteur d'essai 60, tandis que l'enroulement 70 comporte un deuxième brin 74 élastique de l'interrupteur de protection 62. Les deux brins 72,74 s'étendent sensiblement parallèlement l'un à l'autre d'un même côté de l'axe 71, et selon une direction perpendiculaire à l'axe 71. Les deux enroulements 68,70 sont reliés l'un à l'autre par une liaison 76 intermédiaire commune en forme de demi-boucle prenant appui sur un support 78 fixe du boîtier 12 en un point situé du même côté des brins 72,74 par rapport à l'axe 71.According to the invention, the test circuit 54 is equipped with a double spring 66 of conductive material, having two helical windings 68.70 mounted coaxially on a common axis 71 secured to the wall 14 of the insulating housing 12. The winding 68 is extended by a first elastic strand 72 of the test switch 60, while the winding 70 has a second elastic strand 74 of the protective switch 62. The two strands 72,74 extend substantially parallel to each other on the same side of the axis 71, and in a direction perpendicular to the axis 71. The two windings 68,70 are connected to each other by a connection 76 common intermediate in the form of a half-loop bearing on a fixed support 78 of the housing 12 at a point situated on the same side of the strands 72, 74 relative to the axis 71.

L'élasticité du premier brin 72 du ressort 66 sollicite le bouton test 56 vers la position de repos, entraînant l'ouverture de l'interrupteur d'essai 60 (traits pleins sur la figure 1). L'enfoncement du bouton test 56 selon le sens de la flèche F1 sur la figure 2, entraîne directement le premier brin 72 vers la position de test (en pointillé) pour venir en contact avec une borne de la résistance 58. L'interrupteur d'essai 60 reste fermé en permanence en position enfoncée du bouton test 56. L'autre borne de la résistance est connectée en permanence au point 61 du circuit de neutre 20.The elasticity of the first strand 72 of the spring 66 urges the test button 56 towards the rest position, causing the opening of the test switch 60 (solid lines in FIG. 1). The depressing of the test button 56 in the direction of the arrow F1 in FIG. 2, directly drives the first strand 72 towards the test position (dotted line) to come into contact with a terminal of the resistor 58. The switch d test 60 remains permanently closed in the depressed position of test button 56. The other terminal of the resistor is permanently connected to point 61 of neutral circuit 20.

Dans l'état armé du deuxième mécanisme 50 lors de l'enclenchement du disjoncteur 10, la pièce de transmission 64 coopère avec le deuxième brin 74 du ressort 66 pour maintenir l'interrupteur de protection 62 fermé (en traits pleins sur la figure 1). Dans cette position, l'extrémité du deuxième brin 74 prend appui sur une électrode 80 reliée au point 59 du circuit de phase par un conducteur de liaison 82. En cas de déclenchement différentiel, le disjoncteur 10 s'ouvre, et la pièce de transmission 64 pivote autour de l'axe 65 dans le sens trigonométrique (flèche F2 sur figure 1) pour autoriser le déplacement du deuxième brin 74 vers la position en pointillé, correspondant à l'ouverture de l'interrupteur de protection 62.In the armed state of the second mechanism 50 when the circuit breaker 10 is energized, the transmission part 64 cooperates with the second strand 74 of the spring 66 to keep the protective switch 62 closed (in solid lines in FIG. 1). In this position, the end of the second strand 74 is supported on an electrode 80 connected to point 59 of the phase circuit by a connecting conductor 82. In the event of differential tripping, the circuit breaker 10 opens, and the transmission part 64 pivots around the axis 65 in a trigonometric direction (arrow F2 in FIG. 1) to authorize the displacement of the second strand 74 towards the dotted position, corresponding to the opening of the protective switch 62.

On remarque que les deux brins 72,74 élémentaires du ressort 66 conducteur constituent les contacts mobiles respectifs des interrupteurs 60,62 du circuit test 54, l'élasticité de chaque brin 72,74 étant fonction du nombre de spires de l'enroulement 68,70 correspondant. L'insertion des deux enroulements 68,70 du ressort 66 sur l'axe 71 commun simplifie le montage du circuit test 54, et facilite la gestion de fabrication du disjoncteur 10. Le premier brin 72 est conformé en contact test de l'interrupteur d'essai 60, et en organe de rappel du bouton test 56 vers la position de repos. Le deuxième brin 74 est agencé en contact d'autocoupure de l'interrupteur de protection 62, autorisant l'interruption automatique du circuit de test 54 après déclenchement différentiel, même si l'interrupteur d'essai 60 reste fermé lors du maintien prolongé du bouton test 56 en position enfoncée.It is noted that the two elementary strands 72,74 of the conductive spring 66 constitute the respective movable contacts of the switches 60,62 of the test circuit 54, the elasticity of each strand 72,74 being a function of the number of turns of the winding 68, 70 correspondent. The insertion of the two windings 68, 70 of the spring 66 on the common axis 71 simplifies the mounting of the test circuit 54, and facilitates the management of manufacturing of the circuit breaker 10. The first strand 72 is shaped into test contact of the switch d 'test 60, and as a return member of the test button 56 to the rest position. The second strand 74 is arranged in self-interrupting contact of the protective switch 62, authorizing the automatic interruption of the test circuit 54 after differential tripping, even if the test switch 60 remains closed during prolonged holding of the button test 56 in the depressed position.

L'élasticité du ressort 66 sollicite les deux brins 72,74 élémentaires dans le même sens de pivotement grâce à la réaction de la liaison 76 intermédiaire sur le support 78 fixe. Les enroulements 68,70 peuvent avoir un nombre de spires différent selon l'exigence des forces spécifiques de rappel des brins 72,74.The elasticity of the spring 66 urges the two elementary strands 72,74 in the same direction of pivoting thanks to the reaction of the intermediate link 76 on the fixed support 78. The windings 68.70 can have a different number of turns depending on the requirement of the specific restoring forces of the strands 72.74.

Lorsque le disjoncteur 10 est enclenché, l'interrupteur d'essai 60 est ouvert, et l'interrupteur de protection fermé. Le circuit test 54 est interrompu en permanence, et aucun courant ne circule dans la résistance 58 et dans le ressort 66. Les deux enroulements 68,70 de ce dernier se trouvent au potentiel du point 59 associé au circuit de phase.When the circuit breaker 10 is tripped, the test switch 60 is open, and the protection switch closed. Test circuit 54 is permanently interrupted, and no current flows in resistor 58 and in spring 66. The two windings 68, 70 of the latter are found at the potential of point 59 associated with the phase circuit.

Pour effectuer un test différentiel, il suffit d'enfoncer le bouton test 56 dans le sens de la flèche F1, ce qui ferme l'interrupteur d'essai 60, et active le circuit test 54 par la différence de potentiel présente entre les points 59 et 61. Le courant de fuite traversant la résistance 58 est détecté par le tore 44, provoquant un déclenchement différentiel par le relais 48. Le circuit test 54 est alors interrompu par ouverture automatique de l'interrupteur de protection 62. Le relâchement du bouton test 56 entraîne son rappel vers la position de repos sous l'effet élastique du premier brin 72.To perform a differential test, simply press the test button 56 in the direction of the arrow F1, which closes the test switch 60, and activates the test circuit 54 by the potential difference present between the points 59 and 61. The leakage current passing through the resistor 58 is detected by the toroid 44, causing a differential trip by the relay 48. The test circuit 54 is then interrupted by automatic opening of the protection switch 62. The release of the test button 56 causes it to return to the rest position under the elastic effect of the first strand 72.

Le réarmement du deuxième mécanisme 50 s'opère par pivotement de la manette 52 vers la droite (figure 2) provoquant la refermeture de l'interrupteur de protection 62.The second mechanism 50 is reset by pivoting the handle 52 to the right (FIG. 2) causing the protective switch 62 to close again.

Le circuit test 54 selon l'invention est également applicable à un disjoncteur différentiel modulaire à neutre coupé, et à un interrupteur différentiel monobloc. Dans ce dernier cas, le relais du dispositif de protection différentielle agit directement sur le mécanisme de commande de l'interrupteur.The test circuit 54 according to the invention is also applicable to a modular differential circuit breaker with neutral cut, and to a one-piece differential switch. In the latter case, the differential protection device relay acts directly on the switch control mechanism.

Claims (6)

  1. A test circuit for a differential trip device of an electrical switchgear apparatus with differential protection, notably a circuit breaker (10) or a switch, comprising :
    - a test resistance (58) connected in series with a test switch (60) and a protective switch (62) between two points (59, 61) of different potentials,
    - a test button (56) able to occupy a test position to close the test switch (60),
    - a first conducting strand (72) shaped as a test contact of the test switch (60), and a flexible element for restoring the test button (56) to a rest position,
    - and a second conducting strand (74) arranged as a self-breaking contact of the protective switch (62) cooperating with a transmission part (64) of the operating mechanism (50) of the differential trip device, characterized in that the first and second strands (72, 74) form part of the same double spring (66) made of conducting material, having two helical windings (68, 70) mounted coaxially on a common spindle (71), and connected to one another by an intermediate link (76) bearing on a fixed support (78) of the case (12).
  2. The test circuit according to claim 1, characterized in that each winding (68, 70) of the double spring (66) comprises a predetermined number of turns to define the elasticity and specific restoring force of the corresponding strand (72, 74).
  3. The test circuit according to claim 1 or 2, characterized in that the two strands (72, 74) of the spring (66) extend in the same direction, and parallel to one another according to a direction perpendicular to the spindle (71), the gap between the two juxtaposed strands (72, 74) corresponding to the total length of the two windings (68, 70) taken along the spindle (71).
  4. The test circuit according to claim 3, characterized in that the flexibility of the double spring (66) biases the first and second strands (72, 74) in the same direction of pivoting, to respectively restore the test button (56) after opening of the test switch (60) and to open the protective switch (62) after differential tripping.
  5. The test circuit according to one of the claims 1 to 4, characterized in that the first strand (72) cooperates with a terminal of the resistance (58) in the test position of the test button (56), the opposite terminal of the resistance (58) being permanently connected to one of the points (61), notably of the neutral circuit (20), and that the second strand (74) comes into contact with an electrode (80) when the circuit breaker (10) closes, said electrode (80) being connected by a conductor (82) to the other point (59), notably of the phase circuit.
  6. The test circuit according to one of the claims 1 to 5, characterized in that the intermediate link (76) of the spring (66) is shaped as a half-loop enabling the two windings (68, 70) to be connected in series, the bearing point of the link (76) on the support (78) being located on the same side as the strands (72, 74) with respect to the spindle (71).
EP91420141A 1990-05-10 1991-04-29 Test circuit for a differential tripping device Expired - Lifetime EP0456586B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9006550A FR2662019B1 (en) 1990-05-10 1990-05-10 TEST CIRCUIT FOR A DIFFERENTIAL TRIGGER.
FR9006550 1990-05-10

Publications (2)

Publication Number Publication Date
EP0456586A1 EP0456586A1 (en) 1991-11-13
EP0456586B1 true EP0456586B1 (en) 1994-10-19

Family

ID=9396962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91420141A Expired - Lifetime EP0456586B1 (en) 1990-05-10 1991-04-29 Test circuit for a differential tripping device

Country Status (5)

Country Link
EP (1) EP0456586B1 (en)
AT (1) ATE113140T1 (en)
DE (1) DE69104647T2 (en)
ES (1) ES2065654T3 (en)
FR (1) FR2662019B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004005985A1 (en) * 2004-02-06 2005-09-08 Siemens Ag Residual Current Circuit breaker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032826C2 (en) * 1980-08-30 1985-11-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Residual current circuit breaker with a test button for switching on a resistor in a test circuit
ES285200Y (en) * 1985-03-08 1986-05-01 Electrotecnica F. De Roda, S.A. IMPROVEMENTS INTRODUCED IN THE MECHANISMS OF DIFFERENTIAL SWITCHES FOR COUPLING IN OR TO AUTOMATIC SWITCHES
AT384906B (en) * 1985-12-02 1988-01-25 Felten & Guilleaume Ag Oester Fault current circuit breaker and circuit breaker (residual current device)
IT1223520B (en) * 1987-12-17 1990-09-19 Elettrocondutture DEVICE FOR THE RELEASE OF THE CONTACTS OF DIFFERENTIAL SWITCHES

Also Published As

Publication number Publication date
ATE113140T1 (en) 1994-11-15
DE69104647D1 (en) 1994-11-24
ES2065654T3 (en) 1995-02-16
EP0456586A1 (en) 1991-11-13
FR2662019A1 (en) 1991-11-15
DE69104647T2 (en) 1995-05-11
FR2662019B1 (en) 1992-07-24

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