EP3210225B1 - Electric arc-control device - Google Patents

Electric arc-control device Download PDF

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Publication number
EP3210225B1
EP3210225B1 EP15791327.8A EP15791327A EP3210225B1 EP 3210225 B1 EP3210225 B1 EP 3210225B1 EP 15791327 A EP15791327 A EP 15791327A EP 3210225 B1 EP3210225 B1 EP 3210225B1
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EP
European Patent Office
Prior art keywords
arc
contact
horn
electric arc
stationary contact
Prior art date
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Active
Application number
EP15791327.8A
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German (de)
French (fr)
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EP3210225A1 (en
Inventor
Jérôme Hertzog
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.)
Socomec SA
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Socomec SA
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Publication of EP3210225A1 publication Critical patent/EP3210225A1/en
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    • 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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/20—Means for extinguishing or preventing arc between current-carrying parts using arcing horns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • 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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/08—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns

Definitions

  • the invention relates to the field of electric arc cutting devices.
  • an electric arc is born between the electrical contacts.
  • This arc creates a counter-electromotive force in the network which tends to oppose the source of the network.
  • the intensity of the current at the terminals of the switchgear periodically passes through zero. For example, these zero crossings of the intensity take place every 10ms on a 50Hz network.
  • the conductive arc cools suddenly and the ions of the plasma of the arc then recombine. This recombination takes place more or less quickly depending on the cutting technique (fractionation or elongation), the degree of pollution and the type of plasma. This recombination allows the cut to withstand the network voltage still present at its terminals. If this is not the case, a dielectric breakdown re-ignites an arc in the cut, until the next current crossing through zero.
  • the arc horn Due to the presence of a folded switching portion, the arc horn makes it possible to push the arc back into the bottom of the breaking device, to improve its fractionation and to move the arc away from the fixed contact.
  • the displacement of the arc from the fixed contact towards the arc horn also makes it possible to reduce the erosion of the fixed contact due to a limited contact between the electric arc and the fixed contact, which makes it possible to improve the duration. cut-off device life.
  • the arc switching portion constitutes a sacrificial element which will be consumed by the arc in place of the fixed contact, thus making it possible to improve the life of the fixed contact and therefore to increase the life of the breaking device. .
  • the material forming the arc switching portion may have a state change temperature greater than the state change temperature of the material forming the fixed contact. This is the case, for example, when the arc horn is made of steel and the fixed contact is made of copper.
  • the material forming the arc switching portion can have a melting temperature, respectively vaporization, greater than the melting temperature, respectively vaporization, of the material forming the fixed contact.
  • the switching device is present in a case, the arc horn having a width L equal to the internal width of said case.
  • the interrupting device may further include an interrupting chamber comprising a stack of electric arc fractionation plates present opposite the arc horn.
  • Such a device makes it possible to further improve the breaking capacity of the device and thus to further limit the erosion of the electrical contacts due to the arc.
  • the breaking device may be devoid of a stack of electric arc fractionating plates.
  • Such a device advantageously makes it possible to have a simple and inexpensive electric arc breaking solution.
  • the figure 1 represents an example of an electric arc breaking device 1 according to the invention.
  • the illustrated breaking device makes it possible to cut an electric arc in the air.
  • the cut-off device 1 comprises a contact zone 2 in which are present at least one fixed contact 3 and at least one mobile contact 4 with respect to the fixed contact 3.
  • the contacts 3 and 4 can be brought into contact and separated from each other.
  • the movable contact 4 being configured in the example illustrated to effect a rotational movement about an axis of rotation when the contacts are separated.
  • the contact head 3 and the fixed support 15 form a fixed sub-assembly allowing the connection of the switching device 1 in an electrical installation.
  • the contact head 3 can be formed from a metallic material, for example copper. When the movable contact 4 is in contact with the contact head 3, a current can flow between these elements. When the movable contact 4 is separated from the contact head 3, a current cannot flow between these elements.
  • the cut-off device shown is a two-knife, double-cut, rotary cut-off device (see figure 2 ). It does not depart from the scope of the invention when the cutting device is of another type, for example of the single rotary cutoff type with knives or double translational cutoff with knives.
  • the switching device 1 further comprises an arc horn 10 present opposite the contact head 3 on the fixed support 15.
  • the arc horn 10 is fixed to the fixed support 15 by a mechanical connection.
  • the arc horn 10 has a tab 14 as well as an arc switching portion 12.
  • the arc horn is made of an electrically conductive material, the arc horn 10 can for example be formed. of a metallic material, for example steel.
  • the tab 14 is in the example illustrated in contact with the fixed support 15 but it does not depart from the scope of the invention when the arc horn 10 is not in contact with the fixed support 15 but is fixed to the case. constituting the outer casing of the breaking device.
  • the distance separating the arc horn 10 from the fixed support 15 may, for example, be less than or equal to 1 mm.
  • An electric arc generated from the movable contact 4 is intended to move on the arc switching portion 12 as will be detailed below.
  • the height h c of the arc horn 10 is greater than the height h t of the contact head 3
  • the arc switching portion 12 is folded back and extends in a direction opposite to the fixed contact 3 (ie extends away from the fixed contact 3).
  • the switching portion 12 forms, as illustrated, an elbow 12a.
  • the height h c of the arc horn 10 as well as the height h ' c at which the elbow 12a is present are, in the example illustrated, greater than the height h t of the contact head 3.
  • the heights h c , h ' c and h t are measured from the surface S of the fixed support 15 opposite which the arc horn 10 is present and perpendicular to this surface S.
  • the switching device 1 is present in a box 35.
  • the box corresponds to the combination of two half-boxes (see figures 2 and 3 ).
  • the half-box forms with the other half-box (not shown), the outer casing of the switching device.
  • This envelope allows the fixing of the breaking device in the electrical installation.
  • the arc horn 10 has a width equal to the internal width of the housing 35 to reduce, or even prevent, the lateral bypassing of said arc horn 10 by the plasma gases.
  • the figure 4 shows the arc horn and illustrates the fact that it has a sufficient width to limit its lateral bypassing by the gas.
  • the width L of the arc horn 10 corresponds to its largest dimension measured perpendicular to its height.
  • the switching device 1 further comprises, in the example illustrated in figure 1 an interrupting chamber 20 comprising a stack of fractionation sheets 21.
  • the electric arc fractionation sheets 21 are mounted on a sheet support 22 (see figure 3 ).
  • the mounting of the splitting sheets 21 on the sheet support 22 makes it possible to form a rigid interrupting chamber 20.
  • the fractionation sheets 21 are for example made of mild steel.
  • the sheet support 22 can, for example, be made of vulcanized cardboard.
  • the fractionation sheets can alternatively be directly mounted on the box constituting the outer casing of the breaking device.
  • the interrupting chamber 20 illustrated comprises a plurality of stacked dividing plates 21, for example at least three stacked dividing plates 21, for example at least five stacked dividing plates 21.
  • the fractionation plates may for example have a V or U shape when viewed in a direction perpendicular to their plane of elongation.
  • an electric arc 30 is formed after opening of the contacts 3 and 4.
  • the arc 30 is born at the location of the last electrical contact.
  • This arc 30 is subjected to the Laplace force induced by the circulation of the current, this circulation is materialized by the curves 31.
  • the arc 30 is located in a current loop and the Laplace forces which are exerted on this loop tend to open the loop. This effect is commonly referred to as the loop effect.
  • the Laplace force applied to the arc 30 tends to push the arc 30 towards the bottom of the breaking device 1.
  • the contacts continue their opening movement.
  • the arc 30 then moves to the end 3a of the contact head 3 and to the end 4a of the movable contact 4 (see figure 5 ).
  • the plasma from the cooled arc can follow a predetermined path shown by arrows 32. Due to the use of an arc horn 10 of sufficient width, the gases travel a longer path and are therefore better cooled. before their evacuation outside the cut-off device. This can advantageously make it possible to minimize the potential ignitions outside the breaking device.
  • the majority of the volume of these plasma gases is diverted to an exhaust port 40 and circulates in the volume delimited by the switching portion 12 and the fractionation plate closest to this portion. These gases allow the medium close to the arc horn to be under more optimal dielectric breakdown conditions (the dielectric strength decreases when the temperature increases).
  • the contacts continue their opening movement.
  • the arc at the end of the contact head (configuration P1 shown diagrammatically in figure 6 ) then switches to the switching portion 12 of the arc horn 10 (P2 configuration) because its length is shorter after switching.
  • Such switching can be explained by the fact that it is preferable for the electric arc to extend along a path that is as “impedant” as possible, corresponding here to a path having the shortest possible length. This switching results from a dielectric breakdown phenomenon.
  • the arc in the P1 configuration also undergoes the loop effect of the flow of current which tends to deform it and give it a curved shape (see configuration P 'in dotted lines on figure 6 ). This deformation makes it even easier to switch the arc on the arc horn.
  • the arc moves radially during switching on the arc horn, that is to say perpendicular to the axis rotation of the moving contact.
  • the switching portion 12 constitutes a sacrificial part of the breaking device which will be consumed in place of the fixed contact 3. This makes it possible to extend the period during which the contacts of the breaking device can be used and thus to improve the service life of the breaking device.
  • the contacts still continue their opening movement.
  • the arc enters the interrupting chamber and splits. In doing so, it maintains a certain level of fixed voltage (cathodic and anode voltage drops at the level of the different arc feet) and cools (exchange between the arc and the splitting plates which increases the impedance). After complete opening of the contacts, the arc is completely divided in the interrupting chamber (see figures 7 and 8 ).
  • This breaking principle can also be declined without splitting plates, which allows a simplification of the breaking device 50, as illustrated in figure 9 .
  • the switching of the arc of the contact head 3 on the arc horn 10 is carried out as with the interrupting chamber. After switching, the arc no longer stabilizes in the interrupting chamber, but extends to the bottom of the interrupting device 50.
  • This elongation results from Laplace forces as a consequence of the loop effect.
  • the elongation allows the arc to increase its impedance.
  • the arc foot stabilizes at the end of the switching portion 12, this zone being a sacrificial zone as described above.
  • the switching devices according to the invention can be used to cut a direct current (“DC”) or alternating current. (“AC”).
  • the switching devices according to the invention can be used in the field of low voltage (U_AC ⁇ 1000V and U_DC ⁇ 1500V).

Description

Arrière-plan de l'inventionBackground of the invention

L'invention concerne le domaine des dispositifs de coupure d'arcs électriques.The invention relates to the field of electric arc cutting devices.

Lors d'une manœuvre de coupure, un arc électrique nait entre les contacts électriques. Cet arc crée une force contre-électromotrice dans le réseau qui tend à s'opposer à la source du réseau. Dans un réseau à courant alternatif, l'intensité du courant aux bornes de l'appareillage de coupure passe périodiquement par zéro. Par exemple, ces passages de l'intensité par zéro s'effectuent toutes les 10ms sur un réseau 50Hz. Lorsque le courant passe par zéro, l'arc conducteur refroidit brutalement et les ions du plasma de l'arc se recombinent alors. Cette recombinaison s'opère plus ou moins rapidement suivant la technique de coupure (fractionnement ou allongement), le degré de pollution et le type de plasma. Cette recombinaison permet à la coupure de résister à la tension réseau encore présente à ses bornes. Si tel n'est pas le cas, un claquage diélectrique réamorce un arc dans la coupure, jusqu'au prochain passage du courant par zéro.During a breaking operation, an electric arc is born between the electrical contacts. This arc creates a counter-electromotive force in the network which tends to oppose the source of the network. In an alternating current network, the intensity of the current at the terminals of the switchgear periodically passes through zero. For example, these zero crossings of the intensity take place every 10ms on a 50Hz network. When the current passes through zero, the conductive arc cools suddenly and the ions of the plasma of the arc then recombine. This recombination takes place more or less quickly depending on the cutting technique (fractionation or elongation), the degree of pollution and the type of plasma. This recombination allows the cut to withstand the network voltage still present at its terminals. If this is not the case, a dielectric breakdown re-ignites an arc in the cut, until the next current crossing through zero.

Une tension d'arc supérieure à la tension réseau permet de démarrer ce phénomène de recombinaison diélectrique plus tôt que le passage naturel du courant par zéro, ce qui augmente les chances de couper le courant.An arc voltage greater than the network voltage allows this phenomenon of dielectric recombination to start earlier than the natural passage of the current through zero, which increases the chances of cutting the current.

Toutefois, un problème se pose pour les dispositifs de coupure existants du fait de l'érosion possible des contacts électriques par l'arc électrique généré. Cette érosion peut affecter la durée de vie des dispositifs de coupure.However, a problem arises for existing breaking devices due to the possible erosion of the electrical contacts by the generated electric arc. This erosion can affect the service life of the breaking devices.

Il existe donc un besoin pour disposer de nouveaux dispositifs de coupure à durée de vie améliorée dans lesquels l'érosion des contacts due à l'arc électrique est limitéeThere is therefore a need for new switching devices with improved service life in which the erosion of the contacts due to the electric arc is limited.

Le document US 4 642 428 A1 divulgue (fig. 24) un dispositif de coupure d'arc électrique conforme au préambule de la revendication 1.The document US 4,642,428 A1 discloses (fig. 24) an electric arc breaking device according to the preamble of claim 1.

Objet et résumé de l'inventionPurpose and summary of the invention

A cet effet, l'invention propose, selon un premier aspect, un dispositif de coupure d'arc électrique comportant :

  • une zone de contact dans laquelle sont présents au moins un contact fixe et au moins un contact mobile par rapport au contact fixe, les contacts pouvant être mis en contact et séparés l'un de l'autre, et
  • une corne d'arc présente en regard du contact fixe, la hauteur de la corne d'arc étant supérieure ou égale à la hauteur du contact fixe et la corne d'arc présentant une portion de commutation d'arc rabattue s'étendant dans une direction opposée au contact fixe.
To this end, the invention proposes, according to a first aspect, an electric arc breaking device comprising:
  • a contact zone in which are present at least one fixed contact and at least one movable contact with respect to the fixed contact, the contacts being able to be brought into contact and separated from one another, and
  • an arc horn present opposite the fixed contact, the height of the arc horn being greater than or equal to the height of the fixed contact and the arc horn having a folded arc switching portion extending in a direction opposite to the fixed contact.

Du fait de la présence d'une portion de commutation rabattue, la corne d'arc permet de repousser l'arc dans le fond du dispositif de coupure, d'améliorer son fractionnement et d'éloigner l'arc du contact fixe. Le déplacement de l'arc du contact fixe vers la corne d'arc permet aussi de réduire l'érosion du contact fixe du fait d'un contact limité entre l'arc électrique et le contact fixe, ce qui permet d'améliorer la durée de vie du dispositif de coupure. La portion de commutation d'arc constitue un élément sacrificiel qui va être consommé par l'arc à la place du contact fixe permettant ainsi d'améliorer la durée de vie du contact fixe et donc d'augmenter la durée de vie du dispositif de coupure.Due to the presence of a folded switching portion, the arc horn makes it possible to push the arc back into the bottom of the breaking device, to improve its fractionation and to move the arc away from the fixed contact. The displacement of the arc from the fixed contact towards the arc horn also makes it possible to reduce the erosion of the fixed contact due to a limited contact between the electric arc and the fixed contact, which makes it possible to improve the duration. cut-off device life. The arc switching portion constitutes a sacrificial element which will be consumed by the arc in place of the fixed contact, thus making it possible to improve the life of the fixed contact and therefore to increase the life of the breaking device. .

Dans un exemple de réalisation, le matériau formant la portion de commutation d'arc peut avoir une température de changement d'état supérieure à la température de changement d'état du matériau formant le contact fixe. C'est le cas par exemple lorsque la corne d'arc est en acier et le contact fixe en cuivre.In an exemplary embodiment, the material forming the arc switching portion may have a state change temperature greater than the state change temperature of the material forming the fixed contact. This is the case, for example, when the arc horn is made of steel and the fixed contact is made of copper.

Ainsi, le matériau formant la portion de commutation d'arc peut avoir une température de fusion, respectivement de vaporisation, supérieure à la température de fusion, respectivement de vaporisation, du matériau formant le contact fixe.Thus, the material forming the arc switching portion can have a melting temperature, respectively vaporization, greater than the melting temperature, respectively vaporization, of the material forming the fixed contact.

La mise en œuvre d'une telle corne d'arc est avantageuse afin de réduire l'érosion due à l'arc du contact fixe et de la corne d'arc puisque celle-ci est faite d'un matériau résistant à l'érosion due à l'arc. Une telle configuration permet, par conséquent, d'encore plus rallonger la durée de vie du dispositif de coupure.The implementation of such an arc horn is advantageous in order to reduce the erosion due to the arc of the fixed contact and of the arc horn since the latter is made of an erosion resistant material. due to the arc. Such a configuration therefore makes it possible to extend the life of the breaking device even further.

Selon l'invention, le dispositif de coupure est présent dans un boitier, la corne d'arc ayant une largeur L égale à la largeur interne dudit boitier.According to the invention, the switching device is present in a case, the arc horn having a width L equal to the internal width of said case.

La mise en œuvre d'une telle corne d'arc permet de réduire, voire d'éviter, son contournement latéral par les gaz de plasma. Ce faisant, elle permet de rallonger le chemin parcouru par les gaz et ainsi de mieux refroidir ces derniers avant leur évacuation à l'extérieur du dispositif de coupure. Une telle configuration permet avantageusement de minimiser les potentiels amorçages à l'extérieur du dispositif de coupure.The implementation of such an arc horn makes it possible to reduce, or even avoid, its lateral bypassing by the plasma gases. In doing so, it makes it possible to lengthen the path traveled by the gases and thus to better cool the latter before their evacuation outside the cut-off device. Such a configuration advantageously makes it possible to minimize the potential ignitions outside the breaking device.

Dans un exemple de réalisation, le dispositif de coupure peut, en outre, comporter une chambre de coupure comportant un empilement de tôles de fractionnement d'arc électrique présent en regard de la corne d'arc.In an exemplary embodiment, the interrupting device may further include an interrupting chamber comprising a stack of electric arc fractionation plates present opposite the arc horn.

Un tel dispositif permet d'améliorer encore le pouvoir de coupure du dispositif et ainsi de limiter encore plus l'érosion des contacts électriques due à l'arc.Such a device makes it possible to further improve the breaking capacity of the device and thus to further limit the erosion of the electrical contacts due to the arc.

En variante, le dispositif de coupure peut être dépourvu d'un empilement de tôles de fractionnement d'arc électrique.As a variant, the breaking device may be devoid of a stack of electric arc fractionating plates.

Un tel dispositif permet avantageusement de disposer d'une solution de coupure d'arc électrique simple et peu coûteuse.Such a device advantageously makes it possible to have a simple and inexpensive electric arc breaking solution.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante de modes particuliers de réalisation de l'invention, donnés à titre d'exemples non limitatifs, en référence aux dessins annexés, sur lesquels :

  • les figures 1 à 3 représentent un premier exemple de dispositif de coupure selon l'invention,
  • la figure 4 représente un détail du dispositif de coupure illustré aux figures 1 à 3,
  • les figures 5 à 8 représentent l'évolution d'un arc électrique dans le dispositif de coupure des figures 1 à 3, et
  • la figure 9 représente une variante de dispositif de coupure selon l'invention.
Other characteristics and advantages of the invention will emerge from the following description of particular embodiments of the invention, given by way of non-limiting examples, with reference to the appended drawings, in which:
  • the figures 1 to 3 show a first example of a switching device according to the invention,
  • the figure 4 shows a detail of the breaking device illustrated in figures 1 to 3 ,
  • the figures 5 to 8 represent the evolution of an electric arc in the breaking device of figures 1 to 3 , and
  • the figure 9 represents a variant of the switching device according to the invention.

Description détaillée de modes de réalisationDetailed description of embodiments

La figure 1 représente un exemple de dispositif de coupure d'arc électrique 1 selon l'invention. Le dispositif de coupure illustré permet de réaliser une coupure d'arc électrique dans l'air. Le dispositif de coupure 1 comporte une zone de contact 2 dans laquelle sont présents au moins un contact fixe 3 et au moins un contact 4 mobile par rapport au contact fixe 3. Les contacts 3 et 4 peuvent être mis en contact et séparés l'un de l'autre, le contact mobile 4 étant configuré dans l'exemple illustré pour effectuer un mouvement de rotation autour d'un axe de rotation lorsque les contacts sont séparés. La tête de contact 3 et le support fixe 15 forment un sous-ensemble fixe permettant le raccordement du dispositif de coupure 1 dans une installation électrique. La tête de contact 3 peut être formée d'un matériau métallique, par exemple de cuivre. Lorsque le contact mobile 4 est en contact avec la tête de contact 3 un courant peut circuler entre ces éléments. Lorsque le contact mobile 4 est séparé de la tête de contact 3 un courant ne peut circuler entre ces éléments.The figure 1 represents an example of an electric arc breaking device 1 according to the invention. The illustrated breaking device makes it possible to cut an electric arc in the air. The cut-off device 1 comprises a contact zone 2 in which are present at least one fixed contact 3 and at least one mobile contact 4 with respect to the fixed contact 3. The contacts 3 and 4 can be brought into contact and separated from each other. , the movable contact 4 being configured in the example illustrated to effect a rotational movement about an axis of rotation when the contacts are separated. The contact head 3 and the fixed support 15 form a fixed sub-assembly allowing the connection of the switching device 1 in an electrical installation. The contact head 3 can be formed from a metallic material, for example copper. When the movable contact 4 is in contact with the contact head 3, a current can flow between these elements. When the movable contact 4 is separated from the contact head 3, a current cannot flow between these elements.

Le dispositif de coupure illustré est un dispositif de coupure rotative à deux couteaux, double coupure (voir figure 2). On ne sort pas du cadre de l'invention lorsque le dispositif de coupure est d'un autre type, par exemple du type simple coupure rotative à couteaux ou double coupure translative à couteaux.The cut-off device shown is a two-knife, double-cut, rotary cut-off device (see figure 2 ). It does not depart from the scope of the invention when the cutting device is of another type, for example of the single rotary cutoff type with knives or double translational cutoff with knives.

Le dispositif de coupure 1 comporte, en outre, une corne d'arc 10 présente en regard de la tête de contact 3 sur le support fixe 15. La corne d'arc 10 est fixée au support fixe 15 par une liaison mécanique. La corne d'arc 10 comporte une patte 14 ainsi qu'une portion de commutation d'arc 12. La corne d'arc est faite d'un matériau conducteur de l'électricité, la corne d'arc 10 pouvant par exemple être formée d'un matériau métallique, par exemple d'acier. La patte 14 est dans l'exemple illustré en contact avec le support fixe 15 mais on ne sort pas du cadre de l'invention lorsque la corne d'arc 10 n'est pas en contact avec le support fixe 15 mais est fixée au boitier constituant l'enveloppe extérieure du dispositif de coupure. Dans ce dernier cas, la distance séparant la corne d'arc 10 du support fixe 15 peut, par exemple, être inférieure ou égale à 1 mm. Un arc électrique généré à partir du contact mobile 4 est destiné à se déplacer sur la portion de commutation d'arc 12 comme cela va être détaillé plus bas.The switching device 1 further comprises an arc horn 10 present opposite the contact head 3 on the fixed support 15. The arc horn 10 is fixed to the fixed support 15 by a mechanical connection. The arc horn 10 has a tab 14 as well as an arc switching portion 12. The arc horn is made of an electrically conductive material, the arc horn 10 can for example be formed. of a metallic material, for example steel. The tab 14 is in the example illustrated in contact with the fixed support 15 but it does not depart from the scope of the invention when the arc horn 10 is not in contact with the fixed support 15 but is fixed to the case. constituting the outer casing of the breaking device. In the latter case, the distance separating the arc horn 10 from the fixed support 15 may, for example, be less than or equal to 1 mm. An electric arc generated from the movable contact 4 is intended to move on the arc switching portion 12 as will be detailed below.

Comme illustré, la hauteur hc de la corne d'arc 10, correspondant à la hauteur à laquelle l'extrémité 13 de la portion de commutation d'arc 12 est présente, est supérieure à la hauteur ht de la tête de contact 3. La portion de commutation d'arc 12 est rabattue et s'étend dans une direction opposée au contact fixe 3 (i.e. s'étend en s'éloignant du contact fixe 3). La portion de commutation 12 forme, comme illustré, un coude 12a. La hauteur hc de la corne d'arc 10 ainsi que la hauteur h'c à laquelle est présent le coude 12a sont, dans l'exemple illustré, supérieures à la hauteur ht de la tête de contact 3. Les hauteurs hc, h'c et ht sont mesurées à partir de la surface S du support fixe 15 en regard duquel la corne d'arc 10 est présente et perpendiculairement à cette surface S.As illustrated, the height h c of the arc horn 10, corresponding to the height at which the end 13 of the arc switching portion 12 is present, is greater than the height h t of the contact head 3 The arc switching portion 12 is folded back and extends in a direction opposite to the fixed contact 3 (ie extends away from the fixed contact 3). The switching portion 12 forms, as illustrated, an elbow 12a. The height h c of the arc horn 10 as well as the height h ' c at which the elbow 12a is present are, in the example illustrated, greater than the height h t of the contact head 3. The heights h c , h ' c and h t are measured from the surface S of the fixed support 15 opposite which the arc horn 10 is present and perpendicular to this surface S.

Le dispositif de coupure 1 est présent dans un boitier 35. Dans l'exemple illustré, le boitier correspond à la réunion de deux demi-boitiers (voir figures 2 et 3). Le demi-boitier forme avec l'autre demi-boitier (non représenté), l'enveloppe extérieure du dispositif de coupure. Cette enveloppe permet la fixation du dispositif de coupure dans l'installation électrique. La corne d'arc 10 a une largeur égale à la largeur interne du boitier 35 pour réduire, voire empêcher, le contournement latéral de ladite corne d'arc 10 par les gaz de plasma. La figure 4 montre la corne d'arc et illustre le fait que celle-ci présente une largeur suffisante pour limiter son contournement latéral par les gaz. La largeur L de la corne d'arc 10 correspond à sa plus grande dimension mesurée perpendiculairement à sa hauteur.The switching device 1 is present in a box 35. In the example illustrated, the box corresponds to the combination of two half-boxes (see figures 2 and 3 ). The half-box forms with the other half-box (not shown), the outer casing of the switching device. This envelope allows the fixing of the breaking device in the electrical installation. The arc horn 10 has a width equal to the internal width of the housing 35 to reduce, or even prevent, the lateral bypassing of said arc horn 10 by the plasma gases. The figure 4 shows the arc horn and illustrates the fact that it has a sufficient width to limit its lateral bypassing by the gas. The width L of the arc horn 10 corresponds to its largest dimension measured perpendicular to its height.

Le dispositif de coupure 1 comporte, en outre, dans l'exemple illustré à la figure 1 une chambre de coupure 20 comportant un empilement de tôles de fractionnement 21. Les tôles de fractionnement 21 d'arc électrique sont montées sur un support de tôles 22 (voir figure 3). Le montage des tôles de fractionnement 21 sur le support de tôles 22 permet de former une chambre de coupure 20 rigide. Les tôles de fractionnement 21 sont par exemple en acier doux. Le support de tôles 22 peut, par exemple, être en carton vulcanisé. Les tôles de fractionnement peuvent en variante être directement montées sur le boitier constituant l'enveloppe extérieure du dispositif de coupure. La chambre de coupure 20 illustrée comporte une pluralité de tôles de fractionnement 21 empilées, par exemple au moins trois tôles de fractionnement 21 empilées, par exemple au moins cinq tôles de fractionnement 21 empilées. Les tôles de fractionnement peuvent par exemple avoir une forme en V ou en U lorsqu'elles sont observées dans une direction perpendiculaire à leur plan d'élongation.The switching device 1 further comprises, in the example illustrated in figure 1 an interrupting chamber 20 comprising a stack of fractionation sheets 21. The electric arc fractionation sheets 21 are mounted on a sheet support 22 (see figure 3 ). The mounting of the splitting sheets 21 on the sheet support 22 makes it possible to form a rigid interrupting chamber 20. The fractionation sheets 21 are for example made of mild steel. The sheet support 22 can, for example, be made of vulcanized cardboard. The fractionation sheets can alternatively be directly mounted on the box constituting the outer casing of the breaking device. The interrupting chamber 20 illustrated comprises a plurality of stacked dividing plates 21, for example at least three stacked dividing plates 21, for example at least five stacked dividing plates 21. The fractionation plates may for example have a V or U shape when viewed in a direction perpendicular to their plane of elongation.

Comme illustré à la figure 1 notamment, un arc électrique 30 est formé après ouverture des contacts 3 et 4. L'arc 30 nait à l'endroit du dernier contact électrique. Cet arc 30 est soumis à la force de Laplace induite par la circulation du courant, cette circulation est matérialisée par les courbes 31. L'arc 30 se trouve dans une boucle de courant et les forces Laplace qui s'exercent sur cette boucle tendent à ouvrir la boucle. Cet effet est couramment nommé effet de boucle. La force de Laplace s'appliquant sur l'arc 30 tend à pousser l'arc 30 vers le fond du dispositif de coupure 1.As shown in figure 1 in particular, an electric arc 30 is formed after opening of the contacts 3 and 4. The arc 30 is born at the location of the last electrical contact. This arc 30 is subjected to the Laplace force induced by the circulation of the current, this circulation is materialized by the curves 31. The arc 30 is located in a current loop and the Laplace forces which are exerted on this loop tend to open the loop. This effect is commonly referred to as the loop effect. The Laplace force applied to the arc 30 tends to push the arc 30 towards the bottom of the breaking device 1.

Nous allons à présent décrire l'évolution de l'arc 30 généré entre les contacts 3 et 4.We will now describe the evolution of the arc 30 generated between contacts 3 and 4.

Les contacts continuent leur mouvement d'ouverture. L'arc 30 se déplace alors jusqu'à l'extrémité 3a de la tête de contact 3 et jusqu'à l'extrémité 4a du contact mobile 4 (voir figure 5). Le plasma issu de l'arc refroidi peut suivre un chemin prédéterminé matérialisé par les flèches 32. Du fait de la mise en œuvre d'une corne d'arc 10 de largeur suffisante, les gaz parcourent un chemin plus long et sont donc mieux refroidis avant leur évacuation à l'extérieur du dispositif de coupure. Cela peut avantageusement permettre de minimiser les potentiels amorçages à l'extérieur du dispositif de coupure. La majorité du volume de ces gaz de plasma est déviée vers un orifice d'échappement 40 et circule dans le volume délimité par la portion de commutation 12 et la tôle de fractionnement la plus proche de cette portion. Ces gaz permettent au milieu proche de la corne d'arc d'être dans des conditions plus optimales de claquage diélectrique (la rigidité diélectrique décroit quand la température augmente).The contacts continue their opening movement. The arc 30 then moves to the end 3a of the contact head 3 and to the end 4a of the movable contact 4 (see figure 5 ). The plasma from the cooled arc can follow a predetermined path shown by arrows 32. Due to the use of an arc horn 10 of sufficient width, the gases travel a longer path and are therefore better cooled. before their evacuation outside the cut-off device. This can advantageously make it possible to minimize the potential ignitions outside the breaking device. The majority of the volume of these plasma gases is diverted to an exhaust port 40 and circulates in the volume delimited by the switching portion 12 and the fractionation plate closest to this portion. These gases allow the medium close to the arc horn to be under more optimal dielectric breakdown conditions (the dielectric strength decreases when the temperature increases).

Les contacts continuent leur mouvement d'ouverture. L'arc en bout de tête de contact (configuration P1 schématisée à la figure 6) commute alors sur la portion de commutation 12 de la corne d'arc 10 (configuration P2) car sa longueur est plus courte après commutation. Une telle commutation peut s'expliquer par le fait qu'il est préférable pour l'arc électrique de s'étendre selon un chemin le moins « impédant » que possible, correspondant ici à un chemin ayant la plus courte longueur que possible. Cette commutation résulte d'un phénomène de claquage diélectrique. En outre, l'arc dans la configuration P1, subit aussi l'effet de boucle de la circulation du courant qui tend à le déformer et à lui donner une forme recourbée (voir configuration P' en pointillés à la figure 6). Cette déformation permet de faciliter encore plus la commutation de l'arc sur la corne d'arc. Dans l'exemple illustré où il y a rotation du contact mobile 4 lors de l'ouverture des contacts, l'arc se déplace radialement lors de la commutation sur la corne d'arc c'est-à-dire perpendiculairement à l'axe de rotation du contact mobile.The contacts continue their opening movement. The arc at the end of the contact head (configuration P1 shown diagrammatically in figure 6 ) then switches to the switching portion 12 of the arc horn 10 (P2 configuration) because its length is shorter after switching. Such switching can be explained by the fact that it is preferable for the electric arc to extend along a path that is as “impedant” as possible, corresponding here to a path having the shortest possible length. This switching results from a dielectric breakdown phenomenon. In addition, the arc in the P1 configuration also undergoes the loop effect of the flow of current which tends to deform it and give it a curved shape (see configuration P 'in dotted lines on figure 6 ). This deformation makes it even easier to switch the arc on the arc horn. In the example illustrated where there is rotation of the movable contact 4 when the contacts are opened, the arc moves radially during switching on the arc horn, that is to say perpendicular to the axis rotation of the moving contact.

Après commutation, le pied d'arc côté corne d'arc voit une force de Laplace (flèche indiquée à la figure 6) due à l'effet de boucle (circulation du courant 31), qui le pousse vers le fond du dispositif de coupure. Ce faisant, le pied d'arc, du fait de sa très forte température, érode la portion de commutation 12. Ainsi, la portion de commutation 12 constitue une partie sacrificielle du dispositif de coupure laquelle va être consommée à la place du contact fixe 3. Cela permet de rallonger la durée pendant laquelle les contacts du dispositif de coupure peuvent être utilisés et ainsi d'améliorer la durée de vie du dispositif de coupure.After switching, the arc foot on the arc horn side sees a Laplace force (arrow indicated in figure 6 ) due to the loop effect (circulation of current 31), which pushes it towards the bottom of the breaking device. In doing so, the arc foot, due to its very high temperature, erodes the switching portion 12. Thus, the switching portion 12 constitutes a sacrificial part of the breaking device which will be consumed in place of the fixed contact 3. This makes it possible to extend the period during which the contacts of the breaking device can be used and thus to improve the service life of the breaking device.

Les contacts continuent toujours leur mouvement d'ouverture. L'arc pénètre dans la chambre de coupure et se fractionne. Ce faisant, il maintient un certain niveau de tension fixe (chutes de tension cathodique et anodique au niveau des différents pieds d'arc) et se refroidit (échange entre l'arc et les tôles de fractionnement ce qui augmente l'impédance). Après ouverture complète des contacts, l'arc est totalement fractionné dans la chambre de coupure (voir figures 7 et 8).The contacts still continue their opening movement. The arc enters the interrupting chamber and splits. In doing so, it maintains a certain level of fixed voltage (cathodic and anode voltage drops at the level of the different arc feet) and cools (exchange between the arc and the splitting plates which increases the impedance). After complete opening of the contacts, the arc is completely divided in the interrupting chamber (see figures 7 and 8 ).

Ce principe de coupure peut aussi être décliné sans tôles de fractionnement, ce qui permet une simplification du dispositif de coupure 50, comme illustré à la figure 9. La commutation de l'arc de la tête de contact 3 sur la corne d'arc 10 se réalise comme avec la chambre de coupure. Après commutation, l'arc ne se stabilise plus dans la chambre de coupure, mais s'allonge jusqu'au fond du dispositif de coupure 50. Cet allongement résulte des efforts de Laplace conséquence de l'effet de boucle. L'allongement permet à l'arc d'augmenter son impédance. L'arc s'allonge le long de la paroi interne du boitier, ce qui tend à refroidir l'arc et aussi à augmenter son impédance. Le pied d'arc se stabilise au niveau de l'extrémité de la portion de commutation 12, cette zone étant une zone sacrificielle comme décrit précédemment.This breaking principle can also be declined without splitting plates, which allows a simplification of the breaking device 50, as illustrated in figure 9 . The switching of the arc of the contact head 3 on the arc horn 10 is carried out as with the interrupting chamber. After switching, the arc no longer stabilizes in the interrupting chamber, but extends to the bottom of the interrupting device 50. This elongation results from Laplace forces as a consequence of the loop effect. The elongation allows the arc to increase its impedance. The arc lengthens along the internal wall of the case, which tends to cool the arc and also to increase its impedance. The arc foot stabilizes at the end of the switching portion 12, this zone being a sacrificial zone as described above.

Les dispositifs de coupure selon l'invention peuvent être utilisés pour réaliser la coupure d'un courant continu (« DC ») ou alternatif (« AC »). Les dispositifs de coupure selon l'invention peuvent être employés dans le domaine de la basse tension (U_AC≤1000V et U_DC≤1500V).The switching devices according to the invention can be used to cut a direct current ("DC") or alternating current. ("AC"). The switching devices according to the invention can be used in the field of low voltage (U_AC≤1000V and U_DC≤1500V).

L'expression « comportant/contenant/comprenant un(e) » doit se comprendre comme « comportant/contenant/comprenant au moins un(e) ».The expression “comprising / containing / comprising one” should be understood as “comprising / containing / comprising at least one”.

L'expression « compris(e) entre ... et ... » ou « allant de ... à ... » doit se comprendre comme incluant les bornes.The expression "between ... and ..." or "ranging from ... to ..." should be understood as including the limits.

Claims (4)

  1. An electric arc breaker device (1; 50) comprising:
    • a contact zone (2) in which there are present at least one stationary contact (3) and at least one movable contact (4) that is movable relative to the stationary contact (3), the contacts (3; 4) being capable of being put into contact with each other and of being separated from each other; and
    • an arcing horn (10) present facing the stationary contact (3), the height hc of the arcing horn (10) being greater than or equal to the height ht of the stationary contact (3), and the arcing horn (10) presenting a folded-back arc switching portion (12) extending in a direction away from the stationary contact (3);
    the device being present in a box and being characterized in that the arcing horn (10) has a width L equal to the inside width of said box, the width L of the arc horn (10) corresponding to its largest dimension measured perpendicularly to its height.
  2. A device (1) according to claim 1, characterized in that it further includes an extinction chamber (20) containing a stack of electric arc splitting plates (21) present facing the arcing horn (10).
  3. A device (50) according to claim 1, characterized in that it does not include a stack of electric arc splitting plates.
  4. A device (1; 50) according to any one of claims 1 to 3, characterized in that the material forming the arc switching portion (12) has a change-of-state temperature that is higher than the change-of-state temperature of the material forming the stationary contact (3).
EP15791327.8A 2014-10-22 2015-10-20 Electric arc-control device Active EP3210225B1 (en)

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FR1460150A FR3027728B1 (en) 2014-10-22 2014-10-22 ELECTRIC ARC BREAKER DEVICE
PCT/FR2015/052807 WO2016062960A1 (en) 2014-10-22 2015-10-20 Electric arc-control device

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CN (1) CN107004529A (en)
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CN105788986B (en) * 2016-05-17 2017-09-12 浙江人民电器有限公司 A kind of Arc-extinguishing Devices of DC Circuit Breakers
CN105762041B (en) * 2016-05-17 2017-09-12 浙江人民电器有限公司 A kind of dc circuit breaker arc extinguishing structure
CN105762042B (en) * 2016-05-17 2018-01-09 浙江人民电器有限公司 A kind of dc circuit breaker
CN105788987B (en) * 2016-05-17 2018-01-09 浙江人民电器有限公司 A kind of easily disjunction dc circuit breaker
EP3457422B1 (en) * 2017-09-15 2021-04-14 ABB Schweiz AG An electrical switch
EP3457421B1 (en) * 2017-09-15 2021-04-07 ABB Schweiz AG An electrical switch
FI11882U1 (en) 2017-09-15 2017-12-05 Abb Oy Switches
CN110120285B (en) * 2019-06-12 2020-03-31 西南交通大学 Arc extinguishing device for arcing horn

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CN107004529A (en) 2017-08-01
FR3027728A1 (en) 2016-04-29
US20170309426A1 (en) 2017-10-26
EP3210225A1 (en) 2017-08-30
FR3027728B1 (en) 2017-12-08
US10319542B2 (en) 2019-06-11
WO2016062960A1 (en) 2016-04-28
ES2872524T3 (en) 2021-11-02

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