EP2927921B1 - Device for controlling the rebound of the movable contact in a medium voltage electrical protection apparatus, and an electrical protection apparatus comprising such a device - Google Patents

Device for controlling the rebound of the movable contact in a medium voltage electrical protection apparatus, and an electrical protection apparatus comprising such a device Download PDF

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Publication number
EP2927921B1
EP2927921B1 EP15157302.9A EP15157302A EP2927921B1 EP 2927921 B1 EP2927921 B1 EP 2927921B1 EP 15157302 A EP15157302 A EP 15157302A EP 2927921 B1 EP2927921 B1 EP 2927921B1
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EP
European Patent Office
Prior art keywords
contact
bounce
abovementioned
spring
contacts
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EP15157302.9A
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German (de)
French (fr)
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EP2927921A1 (en
Inventor
Pierre Chavy
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Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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Publication of EP2927921A1 publication Critical patent/EP2927921A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/42—Knife-and-clip contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/025—Terminal arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/42—Knife-and-clip contacts
    • H01H2001/425—Knife-and-clip contacts with separate contact pressure spring confined between two contact knifes and urging the knifes onto a mating contact

Definitions

  • the present invention relates to an anti-rebound device for controlling the rebound of at least one moving contact in an electrical protection apparatus, said movable contact being able to be moved between a so-called closing position in which said moving contact is in contact.
  • electrical device with a fixed contact of the apparatus so as to allow the passage of current between these two contacts, and a second position in which these two contacts are separated, said device comprising damping means adapted to limit the rebound of the moving contact at the end of the closing operation of the movable contact, and an electrical protection device comprising such a device.
  • the movable contacts When closing the contacts in a medium voltage electrical protection device, the movable contacts, often in the form of a knife, engage the fixed contacts and at the end of the stroke, strike a stop surface. There is then a rebound phenomenon equivalent to the behavior of the hammer on the anvil.
  • shock absorber is degraded at extreme temperature of use of the devices (-40'C / + 70'C).
  • the elastomeric materials interact with the SF6 gas used in the cutoff enclosures and lose their properties.
  • the present invention solves these problems and proposes a device for controlling the rebound of at least one moving contact, in particular in a medium-voltage electrical protection device, making it possible to suppress the angular displacement of the moving contact during the rebound, in order to obtain a Rigorous and repetitive position of the contacts, whatever their environment and thus to ensure an optimal contact surface for the passage of the current.
  • the subject of the present invention is an anti-rebound device of the kind mentioned above, this device being characterized in that it comprises a spring mounted on one, said first, of the two contacts, and capable of cooperating with the other, said second, these two contacts, at the end of the closing maneuver, so as to ensure the damping of the displacement of the first contact and the indexing of the first contact with respect to the second contact.
  • the aforementioned spring is mounted retractable relative to this first contact, and cooperates with a hooking means carried by the second contact, the hooking means being adapted to perform the hooking of the two contacts in the closed position of the contacts while allowing the opening of the first contact.
  • this attachment means comprises a notch provided in the second contact.
  • this first contact is the aforementioned movable contact while this second contact is the aforementioned fixed contact.
  • the moving contact is of the rotary type.
  • the aforementioned movable contact comprises two knives mechanically connected to one another by an axis
  • the aforementioned spring comprises two windings connected by a so-called horizontal strand
  • said spring having two free ends respectively fixed to the two knives and the two windings being respectively mounted around two end portions of the aforementioned axis, said end portions of the axis being located outside the knives
  • the two knives each also comprising a groove extending substantially parallel to the longitudinal axis of the knives, and intended to slidably receive the aforementioned strand
  • said horizontal strand of the spring cooperating with the fixed contact during closure of the movable contact so that when the movable contact comes into contact with the contact fixed by its input radius, this causes the compression of the spring and thus the sliding of the strand to the grooves, after which the strand engages in the notch of the fixed contact performing damping and indexing above.
  • the aforementioned notch has an input radius and an output radius, and the compression ratio of the spring and the aforementioned input radius and output radius are chosen so as to obtain a hooking of the movable contact on the fixed contact in the direction closing the movable contact, while allowing its opening during a reverse command.
  • the aforementioned fixed contact is a so-called main contact intended for the transport of the nominal current or a ground contact belonging to an earthing switch.
  • the present invention further relates to a medium voltage electrical protection apparatus comprising an anti-rebound device having the above-mentioned characteristics taken alone or in combination.
  • each pair formed of a fixed contact and a movable contact belonging to the apparatus comprises an anti-rebound device comprising the aforementioned characteristics taken alone or in combination.
  • this device is a switch or a medium voltage disconnector.
  • a medium voltage switch I according to a particular preferred embodiment of the invention is partially illustrated on the figure 6 .
  • this switch I is in the closed position and comprises three movable contacts 1,2,3, having been brought into electrical contact with respectively three main fixed contacts 4,5,6, so as to close the electrical circuit in which this switch is placed I.
  • These mobile contacts 1,2,3 are more particularly illustrated on the figures 2,3 and 5 , on which we see that the fixed contacts 4,5,6 are each constituted by a simple knife, while the movable contacts are constituted by a double knife.
  • the two knives 1a, 1b of each movable contact are mechanically connected to each other at each end, by an axis 25 passing through the two end portions respectively of the two knives 1a, 1b.
  • a spacer 7 ensures the space between the two knives.
  • This axis 25 comprises a head supported at one of the two ends, visible on the figure 4 .
  • the opposite end comprises a spring 10 and a cup 11 providing a pressure necessary to the electrical contact, as shown in FIG. figure 3 .
  • These two knives 1a, 1b constituting each movable contact 1 comprise from their free ends, a groove 14,15 extending substantially parallel to the longitudinal direction of the knives, in an axial plane passing through the central axis of the axis above, this plane passing through the middle of the width of the knives.
  • These grooves 14,15 are intended to also receive a portion of the aforementioned indexing spring 13 called strand 19, as will be explained in the following.
  • This indexing spring 13 is constituted by a rigid wire 16 having two windings 17,18, these two windings 17,18 being connected to each other by one, said first, their ends, by a strand of wire 19, said horizontal, extending substantially perpendicular to the plane of the two windings 17,18, and having at their other end, said second, a portion 20,21 folded substantially at right angles.
  • the indexing spring 13 is mounted on the movable contact 1 in the following manner.
  • the horizontal strand 19 of the spring 13 is introduced into the grooves 14,15 of the two knives forming the movable contact. Then, the winding 17 comes to cover the shouldered head of the axis 25 at the end 8 and the winding 18 comes to cap the spring 10 and the cup 11 at the end 9.
  • the fixing of the spring 13 relative to the knives is performed by inserting the two free end portions 20,21 of the indexing spring 13 into two orifices respectively belonging to the two knives.
  • the spring 13 is mounted by capping the already pre-assembled elements. Its curved ends 20,21 hold it in place.
  • Mobile contacts 1,2,3 of the three phases of the switch are equipped with such an indexing spring 13.
  • Each fixed contact 4,5,6 has, as more particularly illustrated on the figure 5 , a single knife comprising at its free end, a solid portion 22 of substantially parallelepipedal shape having on its surface 23 intended to come into contact with the movable contact 1, a recess 24, or notch, extending in a direction substantially parallel to the longitudinal direction of the horizontal strand 19 of the spring 13 and the direction of alignment of the apparatus, and over a certain width of this fixed contact, this width being defined in the plane of the fixed knife 4,5,6 and perpendicular to the direction longitudinal of this fixed knife 4,5,6.
  • this solid part 22 of the fixed contact 4,5,6 are such that it can be slidably inserted between the two knives 1a, 1b of the movable contact 1,2,3 when brought into contact mobile contact on the fixed contact when closing these contacts.
  • the energy present during the rebound is channeled by the spring 13, which spring acts both as a damper of the movement of the movable contact and indexing of the movable contact relative to the fixed contact.
  • the movable knives deviate and come to cap the fixed contact against the action of the contact pressure spring.
  • the strand 19 of the spring comes into contact with the walls of the solid part 22 of the fixed contact 4 delimiting the notch 24 by the exit radius R2, and the spring 13 easily retracts because its compressive force is low (40N) compared to the torque delivered by the control device (95 Nm).
  • the invention is advantageously applicable to any type of medium voltage electrical protection device, such as a switch or a disconnector, having a rotating mobile contact, at the plugging of the electrical contacts.
  • a device for limiting the rebound of at least one moving contact in a medium-voltage electrical protection device has thus been achieved by means of the invention, said device being of simple design and making it possible to obtain a rigorous and repetitive position of the devices. regardless of their environment so as to ensure an optimal contact surface, this being achieved by the addition of an indexing spring mounted on one of the contacts and a notch provided in the other contact, a horizontal strand of the spring retracting on closing and becoming lodged in the notch, preventing rebound.
  • this system can also be used when closing a movable contact on the knife of a fixed earth contact belonging to an earthing switch, the knife having the same notch.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Contacts (AREA)

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention concerne un dispositif anti-rebond destiné à contrôler le rebond d'au moins un contact mobile dans un appareil de protection électrique, ledit contact mobile étant apte à être déplacé entre une position dite de fermeture dans laquelle ledit contact mobile est en contact électrique avec un contact fixe de l'appareil de manière à permettre le passage du courant entre ces deux contacts, et une seconde position dans laquelle ces deux contacts sont séparés, ledit dispositif comportant des moyens d'amortissement aptes à limiter le rebond du contact mobile à la fin de la manoeuvre de fermeture du contact mobile, ainsi qu'un appareil de protection électrique comportant un tel dispositif.The present invention relates to an anti-rebound device for controlling the rebound of at least one moving contact in an electrical protection apparatus, said movable contact being able to be moved between a so-called closing position in which said moving contact is in contact. electrical device with a fixed contact of the apparatus so as to allow the passage of current between these two contacts, and a second position in which these two contacts are separated, said device comprising damping means adapted to limit the rebound of the moving contact at the end of the closing operation of the movable contact, and an electrical protection device comprising such a device.

ETAT DE LA TECHNIQUE ANTERIEURESTATE OF THE PRIOR ART

Lors de la fermeture des contacts dans un appareil de protection électrique moyenne tension, les contacts mobiles, souvent en forme de couteau, s'engagent sur les contacts fixes et en fin de course, percutent une surface de butée. Il se produit alors un phénomène de rebond équivalent au comportement du marteau sur l'enclume.When closing the contacts in a medium voltage electrical protection device, the movable contacts, often in the form of a knife, engage the fixed contacts and at the end of the stroke, strike a stop surface. There is then a rebound phenomenon equivalent to the behavior of the hammer on the anvil.

En conséquence de ce phénomène, la position finale des contacts mobiles est aléatoire. Celle-ci dépend en effet des dispersions géométriques, de la variation d'énergie des commandes, de la pression exercée sur les contacts, de la qualité du graissage et des jeux de montage. Ainsi, l'assurance de disposer de la totalité de la surface de contact nécessaire au passage du courant n'est pas garantie.As a result of this phenomenon, the final position of the moving contacts is random. This depends in fact on the geometric dispersions, the variation of the energy of the controls, the pressure exerted on the contacts, the quality of the lubrication and the mounting clearance. Thus, the insurance of having the entire contact area required for current flow is not guaranteed.

Ainsi, l'on connaît l'utilisation d'une butée dure afin d'assurer l'arrêt des contacts mobiles. Dans ce cas, le rebond n'est pas contrôlé et les couteaux peuvent s'écarter de leur position théorique entraînant une perte de la surface de contact en dessous du niveau requis pour le passage du courant. Et l'on connaît également l'existence de butées en caoutchouc, ou autre élastomère, présentant des qualités d'amortissement. Dans ce cas, à énergie élevée, le rebond persiste.Thus, the use of a hard stop is known to ensure the stopping of the moving contacts. In this case, the rebound is not controlled and the knives can deviate from their theoretical position resulting in a loss of the contact surface below the level required for the passage of the current. And there is also known the existence of rubber stops, or other elastomer, having damping qualities. In this case, at high energy, the rebound persists.

En effet, les propriétés physiques et chimiques de l'amortisseur se dégradent aux températures extrêmes d'utilisation des appareils (-40'C/+70'C). Les matériaux élastomères interagissen t avec le gaz SF6 utilisé dans les enceintes de coupure et perdent de leurs propriétés.Indeed, the physical and chemical properties of the shock absorber are degraded at extreme temperature of use of the devices (-40'C / + 70'C). The elastomeric materials interact with the SF6 gas used in the cutoff enclosures and lose their properties.

EXPOSE DE L'INVENTIONSUMMARY OF THE INVENTION

La présente invention résout ces problèmes et propose un dispositif de contrôle du rebond d'au moins un contact mobile en particulier dans un appareil de protection électrique moyenne tension, permettant de supprimer le déplacement angulaire du contact mobile lors du rebond, afin d'obtenir une position rigoureuse et répétitive des contacts, quel que soit leur environnement et ainsi de garantir une surface de contact optimale pour le passage du courant.The present invention solves these problems and proposes a device for controlling the rebound of at least one moving contact, in particular in a medium-voltage electrical protection device, making it possible to suppress the angular displacement of the moving contact during the rebound, in order to obtain a Rigorous and repetitive position of the contacts, whatever their environment and thus to ensure an optimal contact surface for the passage of the current.

A cet effet, la présente invention a pour objet un dispositif anti-rebond du genre précédemment mentionné, ce dispositif étant caractérisé en ce qu'il comporte un ressort monté sur l'un, dit premier, des deux contacts, et apte à coopérer avec l'autre, dit second, de ces deux contacts, à la fin de la manoeuvre de fermeture, de manière à assurer l'amortissement du déplacement de ce premier contact et l'indexation de ce premier contact par rapport au second contact.For this purpose, the subject of the present invention is an anti-rebound device of the kind mentioned above, this device being characterized in that it comprises a spring mounted on one, said first, of the two contacts, and capable of cooperating with the other, said second, these two contacts, at the end of the closing maneuver, so as to ensure the damping of the displacement of the first contact and the indexing of the first contact with respect to the second contact.

Selon l'invention, le ressort précité est monté escamotable par rapport à ce premier contact, et coopère avec un moyen d'accrochage porté par le second contact, ce moyen d'accrochage étant apte à réaliser l'accrochage des deux contacts en position de fermeture des contacts tout en permettant l'ouverture du premier contact.According to the invention, the aforementioned spring is mounted retractable relative to this first contact, and cooperates with a hooking means carried by the second contact, the hooking means being adapted to perform the hooking of the two contacts in the closed position of the contacts while allowing the opening of the first contact.

Selon une autre caractéristique, ce moyen d'accrochage comporte une encoche prévue dans le second contact.According to another characteristic, this attachment means comprises a notch provided in the second contact.

Selon une autre caractéristique, ce premier contact est le contact mobile précité tandis que ce second contact est le contact fixe précité.According to another characteristic, this first contact is the aforementioned movable contact while this second contact is the aforementioned fixed contact.

Selon une autre caractéristique, le contact mobile est du type rotatif.According to another characteristic, the moving contact is of the rotary type.

Selon une autre caractéristique, le contact mobile précité comporte deux couteaux reliés mécaniquement l'un à l'autre par un axe, et le ressort précité comporte deux enroulements reliés par un brin dit horizontal, ledit ressort comportant deux extrémités libres fixées respectivement aux deux couteaux et les deux enroulements étant montés autour respectivement de deux parties d'extrémité de l'axe précité, lesdites parties d'extrémités de l'axe étant situées à l'extérieur des couteaux, les deux couteaux comportant également chacun une rainure s'étendant sensiblement parallèlement à l'axe longitudinal des couteaux, et destinée à recevoir à coulissement le brin précité, ledit brin horizontal du ressort coopérant avec le contact fixe lors de la fermeture du contact mobile de telle manière que lorsque le contact mobile entre en contact avec le contact fixe par son rayon d'entrée, ceci entraîne la compression du ressort et donc le coulissement du brin à l'intérieur des rainures, après quoi le brin s'engage dans l'encoche du contact fixe réalisant l'amortissement et l'indexation précitée.According to another characteristic, the aforementioned movable contact comprises two knives mechanically connected to one another by an axis, and the aforementioned spring comprises two windings connected by a so-called horizontal strand, said spring having two free ends respectively fixed to the two knives and the two windings being respectively mounted around two end portions of the aforementioned axis, said end portions of the axis being located outside the knives, the two knives each also comprising a groove extending substantially parallel to the longitudinal axis of the knives, and intended to slidably receive the aforementioned strand, said horizontal strand of the spring cooperating with the fixed contact during closure of the movable contact so that when the movable contact comes into contact with the contact fixed by its input radius, this causes the compression of the spring and thus the sliding of the strand to the grooves, after which the strand engages in the notch of the fixed contact performing damping and indexing above.

Selon une autre caractéristique, l'encoche précitée comporte un rayon d'entrée et un rayon de sortie, et le taux de compression du ressort ainsi que le rayon d'entrée et le rayon de sortie précités sont choisis de manière à obtenir un accrochage du contact mobile sur le contact fixe dans le sens de la fermeture du contact mobile, tout en permettant son ouverture lors d'une commande inverse.According to another characteristic, the aforementioned notch has an input radius and an output radius, and the compression ratio of the spring and the aforementioned input radius and output radius are chosen so as to obtain a hooking of the movable contact on the fixed contact in the direction closing the movable contact, while allowing its opening during a reverse command.

Selon une autre caractéristique, le contact fixe précité est un contact dit principal destiné au transport du courant nominal ou bien un contact de terre appartenant à un sectionneur de terre.According to another characteristic, the aforementioned fixed contact is a so-called main contact intended for the transport of the nominal current or a ground contact belonging to an earthing switch.

La présente invention a encore pour objet un appareil de protection électrique moyenne tension comportant un dispositif anti-rebond comportant les caractéristiques précédemment mentionnées prises seules ou en combinaison.The present invention further relates to a medium voltage electrical protection apparatus comprising an anti-rebound device having the above-mentioned characteristics taken alone or in combination.

Selon une caractéristique particulière, chaque paire formée d'un contact fixe et d'un contact mobile appartenant à l'appareil comporte un dispositif anti-rebond comportant les caractéristiques précédemment mentionnées prises seules ou en combinaison.According to a particular characteristic, each pair formed of a fixed contact and a movable contact belonging to the apparatus comprises an anti-rebound device comprising the aforementioned characteristics taken alone or in combination.

Selon une autre caractéristique, cet appareil est un interrupteur ou bien un sectionneur moyenne tension.According to another characteristic, this device is a switch or a medium voltage disconnector.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

Mais d'autres caractéristiques et avantages de l'invention apparaîtront mieux dans la description détaillée qui suit et se réfère aux dessins annexés donnés uniquement à titre d'exemple et dans lesquels :

  • La figure 1 est une vue en perspective d'un ressort d'indexation appartenant à un dispositif anti-rebond selon une réalisation particulière de l'invention,
  • La figure 2 est une vue partielle en perspective d'un contact mobile appartenant à un appareil de protection électrique moyenne tension, selon une réalisation particulière de l'invention,
  • La figure 3 est une vue identique à la figure 2 après le montage sur le contact mobile du ressort d'indexation selon l'invention,
  • La figure 4 est une vue partielle en perspective, illustrant plus particulièrement les trois contacts mobiles d'un interrupteur moyenne tension selon l'invention et le support dans lequel sont montés ces trois contacts mobiles,
  • La figure 5 est une vue partielle en perspective, illustrant plus particulièrement l'un des contacts mobiles et l'un des contacts fixes de l'appareil, équipés du dispositif de rebond selon l'invention,
  • La figure 6 est une vue identique à la figure 4, mais illustrant en plus les contacts fixes de l'appareil, en position de fermeture de l'appareil, et
  • Les figures 7 et 8 sont deux vues partielles en perspective, illustrant à échelle agrandie et respectivement selon deux orientations différentes, plusieurs contacts mobiles en position de fermeture.
But other features and advantages of the invention will become more apparent in the detailed description which follows and refers to the accompanying drawings given solely by way of example and in which:
  • The figure 1 is a perspective view of an indexing spring belonging to an anti-rebound device according to a particular embodiment of the invention,
  • The figure 2 is a partial perspective view of a moving contact belonging to a medium voltage electrical protection device, according to a particular embodiment of the invention,
  • The figure 3 is a view identical to the figure 2 after mounting on the movable contact of the indexing spring according to the invention,
  • The figure 4 is a partial perspective view, illustrating more particularly the three movable contacts of a medium voltage switch according to the invention and the support in which are mounted these three movable contacts,
  • The figure 5 is a partial perspective view, illustrating more particularly one of the movable contacts and one of the fixed contacts of the apparatus, equipped with the rebound device according to the invention,
  • The figure 6 is a view identical to the figure 4 , but also illustrating the fixed contacts of the apparatus, in the closed position of the apparatus, and
  • The Figures 7 and 8 are two partial views in perspective, illustrating on an enlarged scale and respectively in two different orientations, several movable contacts in the closed position.

EXPOSE DETAILLE D'UN MODE DE REALISATION PARTICULIER PREFERE DE L'INVENTION.DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

Un interrupteur moyenne tension I selon une réalisation particulière préférée de l'invention est illustré partiellement sur la figure 6.A medium voltage switch I according to a particular preferred embodiment of the invention is partially illustrated on the figure 6 .

Sur cette figure, cet interrupteur I est en position de fermeture et comporte trois contacts mobiles 1,2,3, ayant été amenés en contact électrique avec respectivement trois contacts fixes principaux 4,5,6, de manière à fermer le circuit électrique dans lequel est placé cet interrupteur I.In this figure, this switch I is in the closed position and comprises three movable contacts 1,2,3, having been brought into electrical contact with respectively three main fixed contacts 4,5,6, so as to close the electrical circuit in which this switch is placed I.

Ces contacts mobiles 1,2,3 sont plus particulièrement illustrés sur les figures 2,3 et 5, sur lesquelles on voit que les contacts fixes 4,5,6 sont constitués chacun par un simple couteau, tandis que les contacts mobiles sont constitués par un double couteau. Les deux couteaux 1a,1b de chaque contact mobile sont reliés mécaniquement l'un à l'autre à chaque extrémité, par un axe 25 traversant les deux parties d'extrémités respectivement des deux couteaux 1a,1b. Une entretoise 7 assure l'espace entre les deux couteaux. Cet axe 25 comporte une tête épaulée à l'une des deux extrémités, visible sur la figure 4. L'extrémité opposée comporte un ressort 10 et une coupelle 11 assurant une pression nécessaire au contact électriquen, tel qu'illustré sur la figure 3.These mobile contacts 1,2,3 are more particularly illustrated on the figures 2,3 and 5 , on which we see that the fixed contacts 4,5,6 are each constituted by a simple knife, while the movable contacts are constituted by a double knife. The two knives 1a, 1b of each movable contact are mechanically connected to each other at each end, by an axis 25 passing through the two end portions respectively of the two knives 1a, 1b. A spacer 7 ensures the space between the two knives. This axis 25 comprises a head supported at one of the two ends, visible on the figure 4 . The opposite end comprises a spring 10 and a cup 11 providing a pressure necessary to the electrical contact, as shown in FIG. figure 3 .

Ces deux couteaux 1a,1b constituant chaque contact mobile 1 comportent à partir de leurs extrémités libres, une rainure 14,15 s'étendant sensiblement parallèlement à la direction longitudinale des couteaux, dans un plan axial passant par l'axe central de l'axe précité, ce plan passant par le milieu de la largeur des couteaux. Ces rainures 14,15 sont destinées à recevoir également une partie du ressort d'indexation précité 13 appelée brin 19, tel que ceci sera expliqué dans ce qui suit.These two knives 1a, 1b constituting each movable contact 1 comprise from their free ends, a groove 14,15 extending substantially parallel to the longitudinal direction of the knives, in an axial plane passing through the central axis of the axis above, this plane passing through the middle of the width of the knives. These grooves 14,15 are intended to also receive a portion of the aforementioned indexing spring 13 called strand 19, as will be explained in the following.

Ce ressort d'indexation 13, selon une réalisation particulière préférée de l'invention illustrée sur la figure 1, est constitué par un fil rigide 16 comportant deux enroulements 17,18, ces deux enroulements 17,18 étant reliés l'un à l'autre par l'une, dite première, de leurs extrémités, par un brin de fil 19, dit horizontal, s'étendant sensiblement perpendiculairement au plan des deux enroulements 17,18, et comportant à leur autre extrémité, dite seconde, une partie 20,21 pliée sensiblement à angle droit.This indexing spring 13, according to a particular preferred embodiment of the invention illustrated on the figure 1 , is constituted by a rigid wire 16 having two windings 17,18, these two windings 17,18 being connected to each other by one, said first, their ends, by a strand of wire 19, said horizontal, extending substantially perpendicular to the plane of the two windings 17,18, and having at their other end, said second, a portion 20,21 folded substantially at right angles.

Le montage du ressort d'indexation 13 sur le contact mobile 1 s'effectue de la manière suivante.The indexing spring 13 is mounted on the movable contact 1 in the following manner.

Tout d'abord, le brin horizontal 19 du ressort 13 est introduit dans les rainures 14,15 des deux couteaux formant le contact mobile. Ensuite, l'enroulement 17 vient coiffer la tête épaulée de l'axe 25 à l'extrémité 8 et l'enroulement 18 vient coiffer le ressort 10 et la coupelle 11 à l'extrémité 9. La fixation du ressort 13 par rapport aux couteaux est réalisée par l'insertion des deux parties d'extrémité libres 20,21 du ressort d'indexation 13 dans deux orifices appartenant respectivement aux deux couteaux. Ainsi, le ressort 13 est monté en coiffant les éléments déjà pré-assemblés. Ses extrémités recourbées 20,21 le maintiennent en place. Les contacts mobiles 1,2,3 des trois phases de l'interrupteur sont équipés d'un tel ressort d'indexation 13.First, the horizontal strand 19 of the spring 13 is introduced into the grooves 14,15 of the two knives forming the movable contact. Then, the winding 17 comes to cover the shouldered head of the axis 25 at the end 8 and the winding 18 comes to cap the spring 10 and the cup 11 at the end 9. The fixing of the spring 13 relative to the knives is performed by inserting the two free end portions 20,21 of the indexing spring 13 into two orifices respectively belonging to the two knives. Thus, the spring 13 is mounted by capping the already pre-assembled elements. Its curved ends 20,21 hold it in place. Mobile contacts 1,2,3 of the three phases of the switch are equipped with such an indexing spring 13.

Chaque contact fixe 4,5,6 comporte, tel que plus particulièrement illustré sur la figure 5, un seul couteau comportant à son extrémité libre, une partie massive 22 de forme sensiblement parallélépipédique comportant sur sa surface 23 destinée à venir en contact avec le contact mobile 1, un évidement 24, ou encoche, s'étendant suivant une direction sensiblement parallèle à la direction longitudinale du brin horizontal 19 du ressort 13 et à la direction d'alignement des appareils, et sur une certaine largeur de ce contact fixe, cette largeur étant définie dans le plan du couteau fixe 4,5,6 et perpendiculairement à la direction longitudinale de ce couteau fixe 4,5,6.Each fixed contact 4,5,6 has, as more particularly illustrated on the figure 5 , a single knife comprising at its free end, a solid portion 22 of substantially parallelepipedal shape having on its surface 23 intended to come into contact with the movable contact 1, a recess 24, or notch, extending in a direction substantially parallel to the longitudinal direction of the horizontal strand 19 of the spring 13 and the direction of alignment of the apparatus, and over a certain width of this fixed contact, this width being defined in the plane of the fixed knife 4,5,6 and perpendicular to the direction longitudinal of this fixed knife 4,5,6.

Les dimensions de cette partie massive 22 du contact fixe 4,5,6 sont telles que celui-ci est susceptible d'être introduit à coulissement entre les deux couteaux 1a,1b du contact mobile 1,2,3 lors de la mise en contact du contact mobile sur le contact fixe lors de la fermeture de ces contacts.The dimensions of this solid part 22 of the fixed contact 4,5,6 are such that it can be slidably inserted between the two knives 1a, 1b of the movable contact 1,2,3 when brought into contact mobile contact on the fixed contact when closing these contacts.

En fonctionnement, lors de la fermeture de l'interrupteur I, le brin horizontal 19 du ressort d'indexation 13 frappe le contact fixe 4 au niveau de son rayon d'entrée R1. Il en résulte que le ressort 13 se comprime grâce à la rainure verticale 14,15 présente sur les couteaux. Arrivé au droit du couteau fixe 4, le ressort 13 s'engage dans l'encoche 24 située sous le contact fixe. Le rebond se produit, mais le ressort 13 s'oppose au mouvement de recul du contact mobile 1 et impose la verticalité aux couteaux 1a, 1b du contact mobile 1,2 ,3, position illustrée sur les figures 6,7 et 8.In operation, when closing the switch I, the horizontal strand 19 of the indexing spring 13 hits the fixed contact 4 at its input radius R1. As a result, the spring 13 is compressed by the vertical groove 14,15 present on the knives. Arrived to the right of the fixed knife 4, the spring 13 engages in the notch 24 located under the fixed contact. The rebound occurs, but the spring 13 opposes the recoil movement of the moving contact 1 and imposes verticality on the knives 1a, 1b of the movable contact 1, 2, 3, as illustrated in FIGS. figures 6 , 7 and 8 .

Ainsi, l'énergie présente lors du rebond est canalisée par le ressort 13, lequel ressort joue à la fois le rôle d'amortisseur du mouvement du contact mobile et d'indexation du contact mobile par rapport au contact fixe. Pendant cette fermeture, les couteaux mobiles s'écartent et viennent coiffer le contact fixe à l'encontre de l'action du ressort de pression de contact. Lors d'une ouverture des contacts mobiles de l'appareil, le brin 19 du ressort entre en contact avec les parois de la partie massive 22 du contact fixe 4 délimitant l'encoche 24 par le rayon de sortie R2, et le ressort 13 s'escamote facilement car son effort de compression est faible (40N) par rapport au couple délivré par le dispositif de commande (95 N.m).Thus, the energy present during the rebound is channeled by the spring 13, which spring acts both as a damper of the movement of the movable contact and indexing of the movable contact relative to the fixed contact. During this closing, the movable knives deviate and come to cap the fixed contact against the action of the contact pressure spring. When the movable contacts of the apparatus are opened, the strand 19 of the spring comes into contact with the walls of the solid part 22 of the fixed contact 4 delimiting the notch 24 by the exit radius R2, and the spring 13 easily retracts because its compressive force is low (40N) compared to the torque delivered by the control device (95 Nm).

On notera que lors des essais d'endurance, le rebond constant obtenu est de ±0,3mm, alors que le rebond moyen sans le système d'indexation est d'environ 9mm.Note that during endurance tests, the constant rebound obtained is ± 0.3mm, while the average rebound without the indexing system is about 9mm.

Ainsi, l'invention s'applique avantageusement à tout type d'appareil de protection électrique moyenne tension, tel un interrupteur ou un sectionneur, comportant un contact mobile rotatif, au niveau de l'embrochage des contacts électriques.Thus, the invention is advantageously applicable to any type of medium voltage electrical protection device, such as a switch or a disconnector, having a rotating mobile contact, at the plugging of the electrical contacts.

On a donc réalisé grâce à l'invention un dispositif destiné à limiter le rebond d'au moins un contact mobile dans un appareil de protection électrique moyenne tension, ledit dispositif étant de conception simple, et permettant d'obtenir une position rigoureuse et répétitive des contacts quel que soit leur environnement de manière à garantir une surface de contact optimale, ceci étant obtenu par l'ajout d'un ressort d'indexation monté sur l'un des contacts et d'une encoche prévue dans l'autre contact, un brin horizontal du ressort s'escamotant à la fermeture et venant se loger dans l'encoche, empêchant le rebond.A device for limiting the rebound of at least one moving contact in a medium-voltage electrical protection device has thus been achieved by means of the invention, said device being of simple design and making it possible to obtain a rigorous and repetitive position of the devices. regardless of their environment so as to ensure an optimal contact surface, this being achieved by the addition of an indexing spring mounted on one of the contacts and a notch provided in the other contact, a horizontal strand of the spring retracting on closing and becoming lodged in the notch, preventing rebound.

Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple.Of course, the invention is not limited to the embodiment described and illustrated which has been given by way of example.

C'est ainsi que ce système peut aussi bien être utilisé lors de la fermeture d'un contact mobile sur le couteau d'un contact fixe de terre appartenant à un sectionneur de terre, ce couteau comportant la même encoche.Thus, this system can also be used when closing a movable contact on the knife of a fixed earth contact belonging to an earthing switch, the knife having the same notch.

Claims (10)

  1. Bounce-prevention device intended to control the bounce of at least one mobile contact in an electrical protection apparatus, said mobile contact being suitable for being displaced between a so-called closure position in which said mobile contact is in electrical contact with a fixed contact of the apparatus so as to allow current to flow between these two contacts, and a second position in which these two contacts are separated, said device comprising damping means suitable for limiting the bounce of the mobile contact at the end of the closure of the mobile contact, the device comprising a spring (13) mounted on one (1,2,3), called first, of the two contacts, and suitable for cooperating with the other (4,5,6), called second, of these two contacts, at the end of the closure of the apparatus, so as to ensure the damping of the displacement of this first contact and the indexing of this first contact relative to the second contact, characterized in that the abovementioned spring (13) is mounted to be retractable relative to this first contact (1,2,3), and cooperates with an attachment means (24) borne by the second contact (4,5,6), this attachment means (24) being suitable for producing the attachment of the two contacts in the closure position of the contacts while allowing the first contact to open.
  2. Bounce-prevention device according to Claim 1, characterized in that the attachment means (24) comprises a notch (24) provided in the second contact (4,5,6).
  3. Bounce-prevention device according to Claim 1 or 2, characterized in that this first contact (1,2,3) is the abovementioned mobile contact whereas this second contact (4,5,6) is the abovementioned fixed contact.
  4. Bounce-prevention device according to any one of the preceding claims, characterized in that the mobile contact (1,2,3) is of the rotary type.
  5. Bounce-prevention device according to Claim 3 or 4, characterized in that the abovementioned mobile contact (1,2,3) comprises two blades (1a,1b) mechanically linked to one another by an axis (25), and in that the abovementioned spring (13) comprises two windings (17,18) linked by a so-called horizontal strand (19), said spring (13) comprising two free end parts (20,21) fixed respectively to the two blades (1a,1b) and the two windings (17,18) being mounted around, respectively, two end parts (8,9) of the abovementioned axis (25), said end parts (8,9) of the axis (25) being situated outside the blades (1a,1b), the two blades also each comprising a groove (14,15) extending substantially parallel to the longitudinal axis of the blades, and intended to slidingly receive the abovementioned strand (19), said horizontal strand (19) of the spring (13) cooperating with the fixed contact (4,5,6) upon the closure of the mobile contact (1,2,3) in such a way that, when the mobile contact comes into contact with the fixed contact by its entry radius R1, this results in the compression of the spring (13) and therefore the sliding of the strand (19) inside the grooves (14,15), after which the strand (19) is engaged in the notch (24) of the fixed contact (4,5,6) producing the damping and the abovementioned indexing.
  6. Bounce-prevention device according to Claim 5, characterized in that the abovementioned notch (24) comprises an entry radius R1 and an exit radius R2, and in that the compression ratio of the spring (13) and the abovementioned entry radius R1 and exit radius R2 are chosen so as to obtain an attachment of the mobile contact (1,2,3) on the fixed contact (4,5,6) in the direction of closure of the mobile contact, while allowing it to open upon a reverse command.
  7. Bounce-prevention device according to any one of the preceding claims, characterized in that the abovementioned mobile contact is a so-called main contact intended to convey the rated current or else an earth contact belonging to an earth disconnector.
  8. Medium-voltage electrical protection apparatus, characterized in that it comprises a bounce-prevention device according to any one of the preceding claims.
  9. Electrical protection apparatus according to Claim 8, characterized in that each pair formed by a fixed contact (4, 5, 6) and a mobile contact (1,2,3) belonging to the apparatus comprises a bounce-prevention device according to any one of Claims 1 to 8.
  10. Electrical protection apparatus according to Claim 8 or 9, characterized in that it is a switch or else a medium-voltage disconnector.
EP15157302.9A 2014-03-31 2015-03-03 Device for controlling the rebound of the movable contact in a medium voltage electrical protection apparatus, and an electrical protection apparatus comprising such a device Active EP2927921B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1452810A FR3019386A1 (en) 2014-03-31 2014-03-31 DEVICE FOR MONITORING THE MOBILE CONTACT REBOUND IN A MEDIUM VOLTAGE ELECTRICAL PROTECTION APPARATUS, AND AN ELECTRICAL PROTECTION APPARATUS COMPRISING SUCH A DEVICE

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EP2927921A1 EP2927921A1 (en) 2015-10-07
EP2927921B1 true EP2927921B1 (en) 2016-08-17

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EP (1) EP2927921B1 (en)
CN (1) CN104952640B (en)
ES (1) ES2602968T3 (en)
FR (1) FR3019386A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105895439A (en) * 2016-04-25 2016-08-24 郑文秀 Isolation knife for high-voltage switch
FR3054367B1 (en) * 2016-07-19 2021-12-10 Schneider Electric Ind Sas DAMPING DEVICE FOR THE MOVEMENT OF A DRIVE SHAFT IN AN ELECTRICAL PROTECTION DEVICE AND ELECTRICAL PROTECTION DEVICE INCLUDING SUCH A DEVICE
DE202019102309U1 (en) 2019-04-24 2020-07-29 Conta-Clip Verbindungstechnik Gmbh Transformer terminal

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Publication number Priority date Publication date Assignee Title
DE1045510B (en) * 1955-01-05 1958-12-04 Voigt & Haeffner Ag Switch with two switch rails on both sides of the fixed mating contact
US3137778A (en) * 1962-04-16 1964-06-16 Gen Electric Pivotally mounted disconnect switch contacts
FR2618591B3 (en) * 1987-07-24 1990-03-02 Vidalenc Francois TIGHTENING DEVICE FOR QUADRUPLE ELECTRIC CONTACT
US6313416B1 (en) * 1999-12-30 2001-11-06 Square D Company Current carrying switch structure
DE10047032C2 (en) * 2000-09-22 2003-12-04 Elpro Gmbh Berlin Industriehol Medium voltage switch disconnectors with vacuum interrupters
CN2859784Y (en) * 2005-12-31 2007-01-17 朱连夫 Knife-type isolator
CN202034286U (en) * 2011-03-31 2011-11-09 厦门科力特电气有限公司 Combined rotatable insulating spindle with isolators

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CN104952640B (en) 2019-12-20
EP2927921A1 (en) 2015-10-07
CN104952640A (en) 2015-09-30
ES2602968T3 (en) 2017-02-23
FR3019386A1 (en) 2015-10-02

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