EP3236482B1 - Schutzschalter mit unterbrechung in der luft, der eine kammer mit verbesserter lichtbogenunterbrechung umfasst - Google Patents

Schutzschalter mit unterbrechung in der luft, der eine kammer mit verbesserter lichtbogenunterbrechung umfasst Download PDF

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Publication number
EP3236482B1
EP3236482B1 EP17167276.9A EP17167276A EP3236482B1 EP 3236482 B1 EP3236482 B1 EP 3236482B1 EP 17167276 A EP17167276 A EP 17167276A EP 3236482 B1 EP3236482 B1 EP 3236482B1
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EP
European Patent Office
Prior art keywords
circuit breaker
stack
equal
electric arc
protective elements
Prior art date
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Application number
EP17167276.9A
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English (en)
French (fr)
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EP3236482A1 (de
Inventor
Marc Rival
Michael MARY
Eric Pinero
Brice JACOLIN
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.)
Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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Publication of EP3236482A1 publication Critical patent/EP3236482A1/de
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Classifications

    • 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
    • H01H33/10—Metal parts
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/64—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid wherein the break is in gas
    • H01H33/65—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid wherein the break is in gas wherein the break is in air at atmospheric pressure, e.g. in open air
    • 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
    • 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
    • H01H9/345—Mounting of arc chutes
    • 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
    • H01H9/346—Details concerning the arc formation chamber
    • 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
    • H01H9/36—Metal parts
    • H01H9/362—Mounting of plates in arc chamber

Definitions

  • the present invention relates to a circuit breaker having an arc-breaking chamber improved.
  • the circuit breakers make it possible to interrupt the flow of an electric current within an electrical circuit, such as a domestic or industrial distribution network.
  • an electrical circuit such as a domestic or industrial distribution network.
  • they comprise separable electrical contacts connected to input and output terminals of an electric current. These electrical contacts are selectively moveable between a closed position, in which they allow the electric current to flow between the terminals and, alternatively, an open position in which they are distant from each other in order to prevent the circulation of this Electric power.
  • Such a cutting chamber comprises metal separation plates stacked horizontally at a distance from each other, which allow to split the electric arc and absorb some of its energy, thus contributing to its extinction. These separating plates are held in place by means of vertical walls, also called cheeks or flanges, which delimit lateral edges of the interrupting chamber.
  • vertical walls also called cheeks or flanges, which delimit lateral edges of the interrupting chamber.
  • these walls are made of fabric polyamide impregnated with thermosetting resin.
  • Such a circuit breaker is for example known from the document EP 1 020 882 A1 .
  • the breaking chambers thus produced do not, however, give satisfaction when the interrupting chamber is subjected repeatedly to arcing for currents of intensity less than 10 kA.
  • currents of intensity between 800A and 4000A and for electrical voltages greater than 690V AC
  • extended duration is meant, for example, a duration greater than or equal to 5 ms or greater than or equal to 10 ms after the opening of the contacts.
  • circuit breakers described in the following documents are also known: US-2013/284702-A1 , WO-2007/113184-A1 and US-2006/026693-A1 , which have similar disadvantages.
  • the invention more particularly intends to remedy by proposing a circuit breaker provided with an arc-breaking chamber having increased durability and better resistance to wear when the circuit-breaker is used for low voltages and electric currents of high intensity.
  • the interrupting chamber further comprises cross-linked polyamide protection elements, the protection elements being placed inside the interrupting chamber, along the side walls on either side of the stack, at the level of junction areas between the side walls and the partition plates, the protection elements covering corners of the partition plates adjacent to the side walls, so as to separate these corners of the separating plates from the electrical contacts, and each protection element has a curved lateral face extending concavely from the side wall adjacent to the protection member to a central region of the stack.
  • the protection elements placed at the junction areas prevent the electric arc formed when opening the contacts to damage.
  • the walls of the interrupting chamber especially when this electric arc remains for an extended period of time at the entrance to the interrupting chamber.
  • the concave shape of the side face plays a role of guiding the electric arc towards the central region of the breaking chamber, away from the side walls.
  • the side walls therefore have improved durability and wear resistance. The reliability of the circuit breaker is thus increased.
  • the figure 1 represents a circuit breaker 2 intended to be used in an electric circuit, in order to allow the interruption of an electric power supply of this electric circuit, for example when a malfunction is detected, such as a short circuit or overcurrent.
  • the circuit breaker 2 is a low-voltage circuit breaker and AC, provided for an electrical voltage greater than or equal to 690 V AC and for electrical currents of greater than 1kA, for example between 800A and 4000A.
  • the circuit breaker is DC.
  • the circuit breaker 2 comprises a housing 4 and input terminals 6 and 8 of an electrical current, partially illustrated, able to connect the circuit breaker 2 to the electrical circuit, for example via sets of busbars. an electrical panel.
  • the terminals 6 and 8 are made of an electrically conductive material, such as copper.
  • the circuit breaker 2 also comprises separable electrical contacts 10 and 12, each provided with a contact pad, or contact patch, respectively 14 and 16, respectively connected to the input terminals 6 and the output terminal 8.
  • the contact pads 14 and 16 are made of an electrically conductive material, for example copper or a pseudo silver alloy.
  • the electrical contacts 10 and 12 are movable relative to each other, selectively and reversibly, between open and closed positions.
  • the contact pads 14 and 16 of the electrical contacts 10 and 12 are in direct contact with each other, thereby allowing the flow of an electric current between the input terminals 6 and 8.
  • the contact pads 14 and 16 are spaced from each other, for example by a distance greater than or equal to 5 mm or 10 mm. In the absence of an electric arc between the contact pads 14 and 16, the electric current is prevented from circulating between the terminals 6 and 8.
  • the circuit breaker 2 also comprises a displacement mechanism, not shown, configured to move the separable electrical contacts 10 and 12 between their open and closed positions relative to one another, for example in response to the detection of a situation. abnormal, such as an overcurrent of electric current.
  • a displacement mechanism configured to move the separable electrical contacts 10 and 12 between their open and closed positions relative to one another, for example in response to the detection of a situation. abnormal, such as an overcurrent of electric current.
  • Such mechanisms of displacement are well known and are not described in more detail.
  • the electrical contact 10 is fixed relative to the housing 4 and only the electrical contact 12 is able to be moved by the movement mechanism.
  • the circuit breaker 2 comprises a breaking chamber 18 of an electric arc.
  • the interrupting chamber 18 is placed inside the casing 4, facing the contact pads 14 and 16, so as to receive an electric arc during the formation thereof.
  • the Figures 2 to 5 illustrate in greater detail an example of the breaking chamber 18.
  • the breaking chamber 18 comprises a stack 20 of several separating plates 22, side walls 24 and an upper arc horn 26. There is a geometric plane "P" median of the break chamber 18.
  • the terms "front” and “rear” relating to the interrupting chamber 18 are defined with respect to the normal direction of flow of the cutoff gases.
  • the front portion of the interrupting chamber 18 designates the portion of the interrupting chamber 18 which faces the contacts 10 and 12 facing them.
  • the rear part of the breaking chamber 18 designates the part of the chamber of cutoff 18 which is oriented outwardly of the housing 4, opposite the front portion. The same applies to the elements of the breaking chamber 18, such as the separating plates 22.
  • the partition plates 22 are made of a metallic material and are configured to extinguish such an electric arc by splitting it and / or partially absorbing its energy by melting or vaporizing the metallic material when the electric arc comes into contact with these plates.
  • the partition plates 22 each have a planar shape.
  • the partition plates 22 are stacked at a distance from each other along a fixed axis X1 of the circuit breaker 2 and are spaced apart from each other along this axis X1.
  • the axis X1 is here parallel to the median plane P.
  • the stack 20 here comprises eleven separating plates 22.
  • the separation plates 22 extend substantially perpendicularly to the axis X1, that is to say here perpendicularly to the axis X1 to less than 5 °, preferably less than 3 ° near.
  • the separating plates 22 are essentially parallel to each other, that is to say here parallel to each other within less than 5 °, preferentially to less than 3 °. They converge towards the front part of the interrupting chamber and move away from each other towards the rear of the breaking chamber 18.
  • the separating plates 22 may be arranged parallel to one another and perpendicularly to the X1 axis.
  • Each of the partition plates 22 is provided with a recess 23, of rounded shape, which extends from the front edge of this partition plate 22 towards the center of this partition plate 22.
  • D22 denotes the thickness of a separating plate 22, measured on the front edge of this plate.
  • E22 denotes the spacing between two consecutive separation plates 22, measured along the axis X1 between the facing faces of these two consecutive separation plates 22.
  • the thickness D22 is, for example, between 2mm and 5mm. By way of illustration, the thickness D22 is here equal to 3.5 mm and the spacing E22 is equal to 4 mm.
  • the separating plates 22 also comprise holding studs 30, which protrude from the lateral edges of this separating plate 22, extending parallel to the plane of the separating plate 22.
  • the side walls 24 have the function of ensuring the holding in place of the stack 20 and laterally delimiting the breaking chamber 18.
  • the walls side 24 are here of flat shape and extend parallel to each other and parallel to the median plane P.
  • Each side wall 24 is formed by a structure of composite material, here composed of a polyamide fabric impregnated with a thermosetting resin.
  • the polyamide is here polyamide 6,6, also called “PA 6,6” or “polyhexamethylene adipamide”.
  • the side walls 24 are for example manufactured according to the method described in EP 1 020 882 A1 .
  • the side walls 24 are devoid of glass fibers.
  • glass fiber-free it is meant that the concentration of glass fibers within each side wall 24, expressed as a mass percentage, is less than or equal to 0.05%, preferably less than or equal to 0.01. %, more preferably less than or equal to 0.001%.
  • glass microbeads are considered to be glass fibers.
  • glass fibers or glass microbeads within the sidewalls 24 is undesirable. Indeed, during the formation of an electric arc, because of the high temperatures involved, typically greater than 700 ° C, the metals present inside the circuit breaker 2 on the passage of the electric arc are partially melted and / or vaporized. This is for example the case of the copper of the contact pads 14 and 16 or the metal of the separation plates 22. This metal is found in suspension in the cut-off gases and is redeposited on the outer surfaces of the glass fibers and, on the where appropriate, glass microbeads, forming locally electrically conductive metallic clusters. This decreases the surface electrical resistance of the sidewalls 24, and increases their risk of dielectric breakdown during the subsequent passage of an electric arc. This can lead to failure of breaker 2 and is therefore not acceptable.
  • each side wall 24 is provided with notches, here through, which receive the holding studs 30, so as to fastening the partition plates 22 in a similar manner.
  • notches are also provided on an upper part of the lateral walls 24, in order to fix the arc horn 26 therein.
  • the side walls 24 are here in contact with the lateral edges of the separating plates 22.
  • the regions of the interrupting chamber are called "junction zones". 18 which are at the junction between the side walls 24 on the one hand and the front edges of the separating plates 22 on the other.
  • the function of the arc horn 26 is to promote the movement of the electric arc, from the contact pads 14 and 16, towards the inside of the breaking chamber 18.
  • the arc horn 26 is placed at distance above the stack 20, between the side walls 24 opposite, in contact with these side walls 24.
  • the arc horn 26 has a portion folded towards the front of the breaking chamber 18 which extends according to a direction substantially parallel to the axis X1, perpendicular to those of the separating plates 22 which are located in an upper part of the stack 20. This folded part is here interposed between the five separating plates 22 of the top of the stack On the one hand and the electrical contacts 10 and 12 on the other hand. This folded portion ends with a lower edge 29.
  • the interrupting chamber 18 further comprises protection elements 40, fixedly placed inside the breaking chamber 18, at the junction zones between the side walls 24 and the front edges of the separating plates 22.
  • protection devices 40 are electrically insulating.
  • the protection elements 40 serve to protect the junction zones between the partition plates 22 and the side walls 24 in order to prevent the electric arc, when it is present inside the breaking chamber 18 between separating plates 22, does not damage the side walls 24 by erosion.
  • the breaking chamber 18 comprises two protection elements 40, identical to each other and each fixed on a side plate 24, symmetrically with each other with respect to the median plane P
  • Each protection element 40 has a block shape extending longitudinally along the axis X1.
  • the protection element 40 comprises in particular a front edge 41, a lower face 42 and a first lateral face 43 which is in contact with the side wall 24 on which the protective element 40 is fixed.
  • the protection element 40 also comprises a second lateral face 44, disposed opposite the first lateral face 43.
  • the second lateral face 44 is curved and extends, with a concave shape, from the lateral wall 24. adjacent, that is to say that to which the protection element 40 is here fixed, to a central region of the stack 20. More specifically, the second side face 44 extends from the front edge 41 and is turned towards the electrical contacts 10 and 12.
  • ⁇ is denoted an inclination angle of the second lateral face 44, this angle ⁇ being measured externally to the protection element 40, opposite the front edge 41, between , on the one hand, the edge of the protective element 40 common to the faces 42 and 44 and, on the other hand, an axis perpendicular to the axis X1 and parallel to the median plane P.
  • the angle ⁇ is between 30 ° and 60 °, preferably between 40 ° and 50 °, more preferably equal to 45 °.
  • the concave shape of the second lateral face 44 plays a role in guiding the electric arc towards the central region of the interrupting chamber, away from the side walls 24. In this way, the electric arc is moved away from the walls. 24. The risk of erosion wear of the side walls 24 is thus reduced.
  • D40 and D40 are denoted by the thicknesses of the lower face 42, respectively measured at the front edge 41 and the opposite edge of the lower face 42. These thicknesses are measured perpendicularly to the median plane P. As illustration, the thickness D40 is equal to 1.5mm and the thickness D40 'is equal to 7mm.
  • the protection elements 40 are arranged at a distance from a zone Z of forming the electric arc.
  • the arc forming zone Z here designates the volume of the space in which the electric arc arises during the displacement of the electrical contacts 10 and 12 to the open position.
  • the zone Z of arc formation is located between the electrical contact 10 and an end of a movable portion 45 of the electrical contact 12 which is electrically connected to the contact pad 16.
  • the movable portion 45 is configured to pivoting relative to the electrical contact 12 when the electrical contacts 10 and 12 are moved away from each other to the open position. In doing so, the end of the movable portion 45 first contacts the electrical contact 10 and then moves away only when the contact pads 14 and 16 are separated from each other. The electric arc is then formed between this end of the movable portion 45 and the electrical contact 10. This prevents the electric arc from being formed between the contact pads 14 and 16, as this could damage them.
  • the movable portion 45 is for example described in the patent EP 0410902 B1 .
  • the contact pads 14 and 16 do not penetrate inside the breaking chamber 18.
  • the zone Z of arc formation is here located outside the breaking chamber 18.
  • D1 the smallest distance between the nearest edges of the contact pads 14 and / or 16 on the one hand, and elements 40 on the other hand.
  • D'1 the smallest distance between the edges of the contact 12 closest to the protection elements 40, here the ends of the movable part 45, on the one hand, and the protection elements 40 on the other hand.
  • the distances D1 and D'1 are measured in the median plane P, for example by orthogonal projection in this median plane P.
  • this distance D1 is here measured with respect to the contact pads 14 and 16 in the closed position of the contacts 10 and 12.
  • the distances D1 and D'1 are further measured with respect to the respective front edges 41 of the protection elements 40.
  • the distance D'1 here corresponds to a distance between the front edges 41 of the protection elements 40 and the zone Z of arc formation between the electrical contacts 10 and 12.
  • the distance D1 is here greater than or equal to 10mm or 20mm.
  • the distance D'1 is greater than or equal to 5 mm, preferably greater than or equal to 7 mm. This distance D'1 is less than or equal to 30mm. In a particularly preferred manner, the distance D'1 is greater than or equal to 12 mm and less than or equal to 15 mm.
  • This arrangement of the protection elements 40 at a distance from the arc formation zone enables them to better withstand the rise in temperature during the formation of an electric arc, away from the zones where the temperature is the highest. .
  • the risk of destruction of the protection elements 40 during the separation of the contacts 10 and 12 is reduced.
  • Each protection element 40 is made of polyamide, for example polyamide 6,6.
  • the protection element 40 is here devoid of glass fibers.
  • This polyamide is crosslinked, which gives it better strength when exposed to high temperatures, typically above 700 ° C transiently.
  • the protective element 40 is manufactured by molding and subsequently undergoes a crosslinking operation.
  • each protective element 40 comprises a mineral material, with a concentration, expressed as a percentage by weight, less than or equal to 40%.
  • This mineral material is different from glass fibers, that is to say it is not made of glass fibers.
  • the mineral material is a silicate material, belonging for example to the family of inosilicates.
  • this mineral material is wollastonite.
  • the endurance of the protection element 40 is enhanced, which is advantageous for certain applications in which the circuit breaker 2 is intended to be subjected to a high number of opening and closing cycles during its lifetime, for example more than 10000 cycles. This is for example the case when the circuit breaker 2 is used together with wind turbines.
  • the reinforcement of the mineral material element is omitted.
  • the elements 40 do not extend over the entire height of the side walls 24.
  • the protection element 40 extends, along the axis X1, from the lower partition plate 22 of the stack 20, to the partition plate 22 of the stack 20 which is located immediately above the lower rim 29 of the arc horn 26.
  • the volume of material of the protection elements 40 is less than or equal to 10 cm 3 , preferably less than or equal to 5 cm 3 .
  • each protection element 40 makes it possible to obtain a satisfactory protection of the lateral walls 24 at the junction zones, while limiting the quantity of gas that can be emitted during the passage of the electric arc. , due to the melting and / or partial vaporization of the protective element 40. This effect is obtained in particular by reducing the amount of material used to form the elements 40 and by limiting the height of each protective element 40.
  • the polyamide used to form the elements 40 is gasogenic, that is to say it gives off gas when it is heated during the passage of the electric arc and / or the cut-off gas in the chamber 18.
  • this gas evolution must be limited as much as possible, because it generates on the one hand an overpressure which can damage the housing 4 and on the other hand increases the pollutant content of the cutoff gas, which forces to install a more efficient system of depollution out of the chamber 18.
  • each protection element 40 comprises fingers 46, or ribs, delimiting housings 48 within the protective element 40.
  • each housing 48 receives a corner before 49 of a partition plate 22 of the stack 20 inside this housing 48.
  • the wedge 49 is adjacent to the side wall 24 and is placed at the front of the partition plate 22. This plate of separation 22 is then said to be engaged with the protection element 40.
  • the fingers 46 then separate the separation plates 22 engaged with the protection element 40 in pairs.
  • Each partition plate 22 has two front corners 49. However, only one front corner 49 is shown on the figure 3 , for the sake of clarity. Because of the provision of the protection elements 40, each partition plate 22 which is engaged in one of the protection elements 40 at one of its front corners 49 is also engaged in the protective element 40 opposite at its other front corner 49.
  • the fingers 46 have a flat and straight plate shape and form upper and lower faces of the housings 48.
  • the housings 48 have a rectangular base shape and open outwardly of the protective element 40 , laterally and at the rear of this protection element 40.
  • the fingers 46 are identical to each other.
  • the housings 48 are identical to each other.
  • the housings 48 are formed by recessing a rear portion of this protection element 40.
  • the fingers 46 project rearwardly from the protection element 40 perpendicularly to this protection element 40, to the way of the fingers of a comb.
  • each protection element 40 comprises seven housings 48 delimited by eight fingers 46.
  • the thickness of a finger 46 and “E46” the spacing between the adjacent faces of two fingers 46 contiguous, this thickness D46 and this spacing E46 being measured along the axis X1.
  • the dimensions of the housings 48, and in particular the spacing E46 are chosen as a function of the thickness D22 of the separating plates 22, to leave as little clearance as possible between the fingers 46 and the wedges 49.
  • the wedges 49 received inside the housings 48 are pressed to the bottom of these housings 48.
  • the thickness D46 is equal to 3mm and the spacing E46 is equal to 4mm.
  • Each of the separating plates 22 engaged with the protective element 40 is thus covered on its upper and lower faces at its corner 49 by fingers 46.
  • the cutoff gas contains suspended metal particles that are electrically conductive.
  • the cutoff gas is prevented from recirculating between the separating plates 22 towards the front of the breaking chamber 18.
  • Such recirculation should be avoided as this could lead to loopback undesirable electric current and prevent power failure.
  • the metal particles contained in the cleavage gas are likely to be deposited by condensation on the side walls 24, at the junction areas. This should also be avoided, as such a deposit would favor short circuits inside the room 18. This deposit on the side walls 24 is here prevented thanks to the comb-shaped structure formed by the alternation of the fingers 46 and the housings 48.
  • each of the separating plates 22 engaged with the protection element 40 is also covered on its front edge, at this same wedge 49, by the second lateral face 44 of the protective protection element 40.
  • the wedge 49 of the partition plate 22 is separated from the contact pads 10 and 12 and is therefore not directly exposed to the arc-forming zone.
  • the electric arc can not approach the side walls 24.
  • the effectiveness of the protection elements 40 is increased, and the side walls 24 are better protected.
  • the partition plates 22 which are received in the housings 48 are here those which extend below the lower rim 29 of the upper arc horn 26, therefore those which are most exposed to the electric arc . It is therefore at the junction of these partition plates 22 with the side walls 24 that an electric arc is most likely to remain and cause damage by erosion of the side wall 24.
  • protection elements 40 when the electric arc enters the breaking chamber 18 and comes into contact with the separating plates 22, it can not approach near the corners 49 of these partition plates 22 which are covered by these protection elements 40, since these protection elements 40 are electrically insulating and are structurally resistant enough not to be destroyed by the electric arc.
  • the erosion of the sidewalls 24 is therefore limited, especially in operating conditions of the circuit breaker 2 for which the interrupting chamber 18 is subjected, repeatedly, to arcing for currents of intensity less than 10kA.
  • the protective elements 40 are attached to the side walls 24. More specifically, each protective element 40 is fixed, integrally and without degree of freedom, to a side wall 24, by means of fixing elements.
  • the fastening elements are rivets 50, which are mounted in corresponding holes 52 of the side wall 24. The rivets 50 allow to fix the protection elements 40 with a satisfactory strength.
  • the protection elements 40 are here differently fixed to the side walls 24, for example by snap-fastening.
  • the rivets 50 and the holes 52 are omitted.
  • the fastening elements then comprise deformable parts, of shape complementary, arranged on the protection elements 40 and on the side walls 24.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)

Claims (9)

  1. Leistungsschalter (2) mit Unterbrechung in Luft, umfassend:
    - zwei trennbare elektrische Kontakte (10, 12), die an Eingangsanschlüsse (6) und Ausgangsanschlüsse (8) für einen elektrischen Strom angeschlossen sind;
    - eine Löschkammer (18) für einen Lichtbogen, um einen bei der Trennung der elektrischen Kontakte (10, 12) gebildeten Lichtbogen zu löschen, wobei diese Löschkammer (18) eine Stapelanordnung (20) aus Trennplatten (22), die voneinander beabstandet sind, und Seitenwände (24), die beidseitig der Stapelanordnung (20) angeordnet sind, aufweist, wobei die Trennplatten (22) an den Seitenwänden (24) befestigt sind;
    wobei die Löschkammer (18) außerdem Schutzelemente (40) aus einem vernetzten Polyamid aufweist, wobei die Schutzelemente (40) im Inneren der Löschkammer entlang der Seitenwände (24) beidseitig der Stapelanordnung (20) an Verbindungszonen zwischen den Seitenwänden (24) und den Trennplatten (22) angeordnet sind, wobei die Schutzelemente (40) die Ecken (49) der Trennplatten (22) benachbart zu den Seitenwänden (24) derart bedecken, dass sie diese Ecken (49) der Trennplatten (22) von den elektrischen Kontakten (10, 12) trennen; dadurch gekennzeichnet, dass jede Seitenwand (24) ein mit einem wärmehärtbaren Harz imprägniertes Polyamidgewebe ohne Glasfasern aufweist und dass jedes Schutzelement (40) eine gekrümmte Seitenfläche (44) aufweist, die sich in einer konkaven Form von der Seitenwand (24) benachbart zu dem Schutzelement (40) zu einem Mittelbereich der Stapelanordnung (20) erstreckt.
  2. Leistungsschalter (2) nach Anspruch 1, dadurch gekennzeichnet, dass jedes Schutzelement (40) Aufnahmekammern (48) aufweist, die von Fingern (46) begrenzt sind, wobei eine Ecke (49) einer Trennplatte (22) der Stapelanordnung (20) im Inneren jedes Aufnahmeraums (48) aufgenommen ist.
  3. Leistungsschalter (2) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Abstand (D'1) zwischen einer Zone (Z) der Bildung eines Lichtbogens zwischen den elektrischen Kontakten (10, 12) und jedem Schutzelement (40) größer oder gleich 5 mm, vorzugsweise größer oder gleich 7 mm, noch bevorzugter zwischen 12 mm und 15 mm beträgt.
  4. Leistungsschalter (2) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schutzelemente (40) aus vernetztem Polyamid jeweils ein mineralisches Material mit einer Massenkonzentration kleiner oder gleich 40% aufweisen, wobei das mineralische Material sich von Glasfasern unterscheidet.
  5. Leistungsschalter (2) nach Anspruch 4, dadurch gekennzeichnet, dass das mineralische Material Wollastonit ist.
  6. Leistungsschalter (2) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das vernetzte Polyamidmaterial der Schutzelemente (40) Polyamid 6,6 ist.
  7. Leistungsschalter (2) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schutzelemente (40) sich im Wesentlichen parallel zur Stapelanordnung (20) von einem unteren Ende der Stapelanordnung (20) bis zu einem unteren Rand (29) eines oberen Lichtbogenhorns (26), das über der Stapelanordnung (20) liegt, erstrecken.
  8. Leistungsschalter (2) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Materialvolumen der Schutzelemente (40) der Löschkammer (18) kleiner oder gleich 10 cm3, vorzugsweise kleiner oder gleich 5 cm3 ist.
  9. Leistungsschalter (2) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schutzelemente (40) mittels Nieten (50) an den Seitenwänden (24) befestigt sind.
EP17167276.9A 2016-04-21 2017-04-20 Schutzschalter mit unterbrechung in der luft, der eine kammer mit verbesserter lichtbogenunterbrechung umfasst Active EP3236482B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1653554A FR3050566B1 (fr) 2016-04-21 2016-04-21 Disjoncteur a coupure dans l'air presentant une chambre de coupure d'arc electrique amelioree

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EP3236482B1 true EP3236482B1 (de) 2019-02-06

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US (1) US10192700B2 (de)
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CN (1) CN107305815B (de)
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KR102196740B1 (ko) * 2019-04-05 2020-12-30 엘에스일렉트릭(주) 직류 기중 회로 차단기용 소호부 구조체
KR102349754B1 (ko) * 2019-12-06 2022-01-11 엘에스일렉트릭(주) 아크 박스 및 이를 포함하는 전자 접촉기
CN210897140U (zh) * 2019-12-24 2020-06-30 施耐德电器工业公司 分断器和接触器
CN210956485U (zh) * 2019-12-24 2020-07-07 施耐德电器工业公司 分断器、分断器组件和接触器
KR102542379B1 (ko) * 2020-03-03 2023-06-12 엘에스일렉트릭(주) 아크 소호 조립체
KR102542380B1 (ko) * 2020-03-13 2023-06-12 엘에스일렉트릭(주) 아크 소호부 및 이를 포함하는 기중 차단기
KR102389730B1 (ko) * 2020-04-02 2022-04-22 엘에스일렉트릭(주) 아크 소호 조립체 및 이를 포함하는 차단기
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Publication number Publication date
EP3236482A1 (de) 2017-10-25
RU2720347C2 (ru) 2020-04-29
US20170309425A1 (en) 2017-10-26
RU2017113462A (ru) 2018-10-19
CN107305815A (zh) 2017-10-31
ES2721510T3 (es) 2019-08-01
CN107305815B (zh) 2020-10-20
FR3050566A1 (fr) 2017-10-27
US10192700B2 (en) 2019-01-29
RU2017113462A3 (de) 2020-03-16
FR3050566B1 (fr) 2019-08-30

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