EP2733720B1 - Thermomagnetischer Auslöser zur Auslösung eines Mehrphasen-Überlastschalters - Google Patents

Thermomagnetischer Auslöser zur Auslösung eines Mehrphasen-Überlastschalters Download PDF

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Publication number
EP2733720B1
EP2733720B1 EP13354040.1A EP13354040A EP2733720B1 EP 2733720 B1 EP2733720 B1 EP 2733720B1 EP 13354040 A EP13354040 A EP 13354040A EP 2733720 B1 EP2733720 B1 EP 2733720B1
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EP
European Patent Office
Prior art keywords
thermal
transmission bar
tripping
ratchet
transmission
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EP13354040.1A
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English (en)
French (fr)
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EP2733720A1 (de
Inventor
Claude Rubbo
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Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/04—Means for indicating condition of the switching device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/04—Means for indicating condition of the switching device
    • H01H2071/042—Means for indicating condition of the switching device with different indications for different conditions, e.g. contact position, overload, short circuit or earth leakage

Definitions

  • the invention relates to a magnetothermal trip device for monitoring a plurality of phase currents flowing through a polyphase circuit breaker and for tripping this polyphase circuit breaker in the event of an anomaly affecting at least one of the phase currents.
  • a circuit breaker can be used to simultaneously provide two protections, namely protection against persistent overcurrents, also called overloads of current, and protection against very high currents resulting from a short circuit.
  • the tripping of the circuit-breaker that is to say the opening of its contacts, can be controlled by a thermomagnetic trip unit, which recognizes the current overloads as short-circuits.
  • EP 0 848 404 a part of a magnetothermal trip device is described which has many advantages, for example the advantage of being directly associated with any one or more polyphase breakers of a certain type, so as to be able to control their tripping. .
  • Another part of this magnetothermal circuit breaker is presented in the European patent application EP 0 542 641 .
  • the European patent application EP 0 954 002 proposes a circuit breaker able to mechanically display the cause of a trip among a current overload and a short circuit.
  • Another example of a circuit breaker that can mechanically display the cause of a trip among a current overload and a short circuit is in the patent. US 6,239,677 United States of America.
  • the mechanism for tripping the circuit breaker in the event of a short-circuit or overload is complex and has many components.
  • this mechanism is bulky and it is not adaptable or easily adaptable to certain circuit breakers.
  • the object of the invention is at least to enable a magnetothermal trip device for monitoring a plurality of phase and tripping currents of a circuit breaker to be able to mechanically display the cause of tripping among a current overload and a short circuit. -circuit, while not very complex.
  • the first and second transmission bars are decoupled from one another in rotation about the pivot axis.
  • the trigger comprises a first elastic member reminding the first transmission bar to a rest position, a second elastic member reminding the second transmission bar to a rest position, and a third elastic member reminding the ratchet to away from its release position and towards its locking position.
  • the first transmission bar comprises a plurality of first bearings threaded onto the support shaft, as well as at least a first connecting bar rigidly connecting the first bearings to each other, the second transmission bar having a plurality of second bearings threaded onto the support shaft. support, and at least a second connecting bar rigidly connecting the second bearings to each other, the first and second bearings being offset with each other along said pivot axis.
  • the first transmission bar comprises first arms arranged so that, by acting on one of these arms, each thermal actuator can rotate the first transmission bar in the second direction.
  • the second transmission bar has second arms arranged so that, by acting on one of these arms, each magnetic actuator can rotate the second transmission bar in the second direction.
  • a magnetothermal trip and polyphase 1 is intended to be associated with a polyphase circuit breaker not shown, such as that described in the European patent application EP 0 542 636 .
  • the purpose of trigger 1 is to monitor the phase currents flowing in the polyphase circuit breaker phases and to trip this circuit breaker in the event of a current overload in one of the phases or in the event of a short circuit affecting at least one of the phases. one of the phases.
  • the trigger 1 has three phases 2, each of which comprises a conductor 3 intended to be traversed by one of the phase currents to be monitored.
  • the trigger 1 comprises an insulating envelope, which comprises an assembly box 4 and a front panel 5 fixed to one another.
  • Each conductor 3 has the shape of a tab several times bent, each end of which forms an electrical connection terminal 6 protruding outside the assembly box 4.
  • a pivoting adjustment member 7 is accessible through a hole in the frontage 5.
  • the trigger 1 comprises two identical indicators 11 and 12, whose function is to indicate together which cause among a current overload and a short circuit was at the origin of a past trip command. More specifically, when a past trip command has been generated by the circuit breaker 1 due to a current overload crossing a conductor 3, this is indicated by the indicator 11.
  • the indicator 12 is used to signal each trip command past that was generated by the circuit breaker 1 due to a short circuit.
  • Each of the indicators 11 and 12 comprises a push button 13 and a window 14 passing through the facade 5 from one side to the other.
  • each of the indicators 11 and 12 further comprises a signal member 15, which mounted behind a front wall of the front 5 so as to be pivotable about a pivot axis XX 'substantially perpendicular to the front wall.
  • Each push button 13 passes through the front 5, at the level of a finger of one of the signaling members 15. It can exert a transverse thrust on the finger, after having itself been pushed manually from the outside.
  • the trigger 1 comprises an energy storage mechanism 20 known per se, a striker 21 is visible at the figure 3 .
  • This striker 21 is a trigger piece that can be tilted about a tilting axis Y 1 -Y ' 1 , between a neutral position and an active position to which the striker 1 is resiliently biased by a spring not visible in the figures.
  • the energy storage mechanism 20 is armed, insofar as the striker 21 is retained in its neutral position because of its attachment to a pawl 30 itself being in a latching position.
  • the pawl 30 is part of an intermediate transmission device which comprises two other pivoting parts, namely two transmission rods 31 and 32.
  • the pawl 30 and the transmission rods 31 and 32 are mounted on one and the same common support shaft 33. , so that they can all pivot around the same pivot axis Y 2 -Y ' 2 .
  • the support shaft 33 is secured to the housing 4 by its two opposite ends.
  • the transmission bars 31 and 32 are decoupled from each other in pivoting about their common pivot axis Y 2 -Y ' 2 .
  • a compression spring 34 forms an elastic return member of the pawl 30 towards its hooking position, about the pivot axis Y 2 -Y ' 2 , in a direction S 1 .
  • the reference S 2 designates the opposite direction in the S 1 direction.
  • a compression spring 35 forms a resilient return member of the transmission bar 31 in the direction S 1 , about the pivot axis Y 2 -Y ' 2 , to a rest position.
  • a torsion spring 36 forms a resilient return member of the transmission bar 32 in the direction S 1 , about the pivot axis Y 2 -Y ' 2 , to a rest position.
  • a bimetallic thermal actuator 40 is provided for each phase.
  • the thermal actuators 40 are shown schematically in the figure 4 . Each of them may possess the constitution and operation described in the patent application European EP 0 542 641 supra.
  • Each thermal actuator 40 is configured to generate a mechanical triggering command in response to a current overload in the corresponding phase.
  • This mechanical triggering control has the form of a thrust that a head 41 of the thermal actuator 40 exerts on the transmission bar 31 and which acts in the opposite direction of the spring 35, in the direction S 2 around the Y-axis 2 -Y ' 2 .
  • the arrow P 1 symbolizes an example of such a thrust exerted by a thermal actuator 40.
  • a magnetic actuator 42 is provided for each phase.
  • the magnetic actuators 42 are shown schematically in the figure 4 . Each of them may possess the constitution and operation described in the European patent application EP 0 848 404 supra.
  • Each magnetic actuator 42 is configured to generate a mechanical triggering command in response to a short circuit relating to the corresponding phase.
  • This mechanical triggering control has the form of a thrust that a movable flap 43 of the magnetic actuator 42 exerts on the transmission bar 32 and which acts in the opposite direction of the spring 36, in the direction S 2 around the Y axis 2 -Y ' 2 .
  • the arrow P 2 symbolizes an example of such a thrust exerted by a magnetic actuator 42.
  • the transmission bar 31 is shown alone at the figure 5 . It comprises three mounting bearings 50, which are threaded onto the support shaft 33, offset between them along the pivot axis Y 2 -Y ' 2 and rigidly connected by an axial connecting bar 51. Transmission 31 also comprises as many arms 52 for receiving a thrust P 1 as there are thermal actuators 40. Each mounting bearing 50 carries one of the arms 52, each of which comprises an attached pusher 53 remote from the pivot axis Y 2 -Y ' 2 .
  • each head 41 can exert a mechanical triggering control in the form of a thrust P 1 , on a pusher 53 , in order to rotate the transmission rod 31 in the direction S 2 , in response to a current overload.
  • One of the arms 52 carries a finger 54 for actuating the signaling member 15 of the indicator 11.
  • the transmission bar 51 has a shoulder 55 for pushing on the pawl 30 to drive it into its release position, as will be specified later.
  • the transmission rod 31 can be slid along the support shaft 33. Its axial position can be adjusted by means of the adjustment member 7.
  • the transmission bar 31 comprises a coupling fork 56 to this adjustment member 7.
  • the bearings 50, the bar 51, the arms 52, the finger 54 and the fork 56 are part of an integral piece, molded in polymer, to which the pushers 53 are fixed.
  • the transmission bar 32 is shown alone at the figure 6 . It comprises three mounting bearings 60, which are threaded onto the support shaft 33, offset between them along the pivot axis Y 2 -Y ' 2 and rigidly connected by an axial connecting bar 61.
  • the bar of FIG. transmission 32 also comprises as many arms 62 for receiving a thrust P 2 as there are magnetic actuators 42. Carried by one of the hubs 60, each arm 62 comprises a pusher 63 remote from the pivot axis Y 2 -Y ' 2 .
  • each flap 43 can exert a mechanical triggering control in the form of a thrust P 2 , on a pusher 63 , in order to rotate the transmission bar 32 in the direction S 2 , in response to a short circuit.
  • a bearing 60 carries an arm 64 for actuating the signaling member 15 of the indicator 12.
  • Each of two successive bearings 60 carries a hooking lug 65, which defines one of two flat surfaces 66 of thrust on the pawl 30 so as to drive it into its release position, as will be specified later.
  • the transmission bar 32 is a single piece, molded of polymer.
  • the pawl 30 is shown alone to figures 7 and 8 . It comprises a mounting hub 70, which is threaded onto the support shaft 33 and which carries a finger 71 for retaining the striker 21 by hooking. At a distance from the hub 70, the free end of the finger 71 is provided with a catch 72 for attaching the striker 21.
  • the pawl 30 defines a surface 73 extending outwardly from the hub 70, substantially parallel to the Y 2 -Y ' 2 axis. This surface 73 is configured to cooperate with the shoulder 55 and to receive a thrust of the latter.
  • the pawl 30 further defines two surfaces 74 extending outwardly from the hub 70, substantially parallel to the Y 2 -Y ' 2 axis. These surfaces 74 are configured to cooperate with the thrust surfaces 66 and to simultaneously receive thrusts thereof.
  • a signaling member 15 is shown alone at the figure 9 . It comprises a crank arm 80, which is pierced with a mounting hole of a not shown support shaft, centered on the pivot axis X-X '.
  • the crank arm 80 carries a rear crank pin 81 offset relative to the pivot axis X-X ', a flexible finger 82 substantially perpendicular to this pivot axis X-X', and a flexible arc 83 for returning the crank. the signaling member 15 to a masked state.
  • the finger 82 is elastically flexible rearwardly, in a plane parallel to the pivot axis X-X '. Its free end carries a projection 84 able to engage in a window 14 and thus lock the signal member 15 in a visible state indicating that a trip has occurred.
  • the thermal actuator 40 associated with this phase 3 produces a displacement resulting in a thrust P 1 , rotating the transmission rod 31 in the direction S 2 .
  • the shoulder 55 clings to the surface 73 and then pushes on it in the direction S 2 and thus pivots the pawl 30 to its release position, which is illustrated by the figure 10 .
  • the striker 21 has unhooked the spout 72 and it will move and accelerate until a percussion causing the tripping of the circuit breaker.
  • the pivoting of the transmission rod 31 in the direction S 2 causes the finger 54 to push on the pin 81 present in the indicator 11 and thus actuate the signaling member 15 of the indicator 11.
  • this signaling member 15 Prior to the appearance of a current overload, this signaling member 15 was in its masked state, which is the one shown in FIG. figure 12 .
  • the signaling member 15 of the indicator 11 is held in the same angular position as at the figure 2 due to the elastic return exerted by its flexible bow 83. It is then completely masked by the facade 5.
  • the finger 82 of the indicator 11 is curved resiliently towards the rear.
  • the finger 54 rotates the signal member 15 of the indicator 11, about the pivot axis XX 'corresponding, against the bias exerted by the arc 83 of this signaling member 15.
  • the signaling member 15 of the indicator 11 has changed state and it is in its visible state, which is the one shown in FIGS. Figures 13 and 14 .
  • the finger 82 of the indicator 11 has recovered itself and is now rectilinear. Its projection 84 is engaged in the window 14 of the indicator 11, which locks the signal member 15 of the indicator 11 in its visible state. The visible presence of the projection 84 of the indicator 11 in the window 14 of this indicator 11 indicates that a trip following a current overload has occurred.
  • the pivoting of the transmission bar 32 in the direction S 2 causes the arm 64 to push on the crank pin 81 of the signaling member 15, in the indicator 12, and thus actuate this signaling member 15.
  • the signaling member 15 of the indicator 12 was in its masked state, which is the one shown in FIG. figure 2 .
  • this signaling member 15 has changed state and it is in its visible state, which is that of the figure 17 and which is analogous to the state represented in figure 13 .
  • the visible presence of the projection 84 of the indicator 12 in the window 14 of the same indicator 12 indicates that a trip following a short circuit has occurred.
  • the transmission bar 32 is configured to be part of a large-caliper magnetothermal trip unit. Modifications can be made to this bar to adapt it to a small magnetothermal release. These modifications may relate in particular to the conformation of the arms 62 and their angular position around the axis Y 2 -Y ' 2 .

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Claims (8)

  1. Thermomagnetischer Auslöser zur Überwachung mehrerer Phasenströme eines Mehrphasen-Überlastschalters und zur Auslösung dieses Mehrphasen-Überlastschalters im Falle von Betriebsstörungen, die sich auf mindestens einen der Phasenströme auswirken, umfassend:
    - mehrere Phasen (2),
    - mehrere thermische Betätigungselemente (40), von denen eines vorgesehen ist, in einer der Phasen (2) auf eine Strom-Überlast zu reagieren, indem es einen mechanischen Auslösungsbefehl erzeugt (P1, P2),
    - mehrere magnetische Betätigungselemente (42), von denen eines vorgesehen ist, in einer der Phasen (2) auf einen Kurzschluss zu reagieren, indem es einen mechanischen Auslösungsbefehl erzeugt (P1, P2),
    - eine Zwischenübertragungsvorrichtung, die so vorgesehen ist, dass sie einen beliebigen der mechanischen Auslösungsbefehle (P1, P2) empfängt und eine Sperrraste (30) umfasst, die in Richtung auf eine Verriegelungsposition elastisch in eine erste Richtung (S1) zurückgezogen wird und so angeordnet ist, dass der Empfang eines Auslösungsbefehls (P1, P2) durch die Übertragungsvorrichtung diese Sperrraste (30) aus ihrer Verriegelungsposition, in der die Sperrraste (30) ein Auslösungselement (21) durch Eingreifen in einem neutralen Zustand zurückhalten kann, in eine Freigabeposition überführt, in der das Auslösungselement (21) von der Sperrraste (30) abgekuppelt ist,
    - eine Trägerwelle (33), an die die Sperrraste (30) so montiert ist, dass sie in ihrer Verriegelungs- und in ihrer Freigabeposition um eine Schwenkachse (Y2-Y'2) schwenken kann, dadurch gekennzeichnet, dass er umfasst:
    - eine erste Anzeigevorrichtung (11), die vorgesehen ist, ein von einer Stromüberlast hervorgerufenes Auslösen anzuzeigen, und
    - eine zweite Anzeigevorrichtung (12), die vorgesehen ist, ein von einem Kurzschluss hervorgerufenes Auslösen anzuzeigen,
    eine Zwischenübertragungsvorrichtung, die umfasst:
    - eine erste Übertragungsstange (31), die so an die Trägerwelle (33) montiert ist, dass sie um die gleiche Schwenkachse (Y2-Y'2) wie die Sperrraste (30) in einer zweiten, zur ersten Richtung (S1) konträren Richtung (S2) geschwenkt werden kann, und zwar durch ein beliebiges der thermischen Betätigungselemente (40) entsprechend einer Bewegung, während derer diese erste Übertragungsstange (31) gleichzeitig die Sperrraste (30) aus ihrer Verriegelungs- in ihre Freigabeposition mitnimmt und eine Änderung des Zustands der ersten Anzeigevorrichtung (11) bewirkt, und
    - eine zweite Übertragungsstange (32), die so an die Trägerwelle (33) montiert ist, dass sie um die gleiche Schwenkachse (Y2-Y'2) wie die Sperrraste (30) in der genannten zweiten Richtung (S2) geschwenkt werden kann, und zwar durch ein beliebiges der magnetischen Betätigungselemente (42), entsprechend einer Bewegung, während derer diese zweite Übertragungsstange (32) sowohl die Sperrraste (30) aus ihrer Verriegelungs- in ihre Freigabeposition mitnimmt als auch eine Änderung des Zustands der zweiten Anzeigevorrichtung (12) bewirkt,
    wobei die erste und die zweite Übertragungsstange (31, 32) in ihrer Schwenkbewegung um die Schwenkachse (Y2-Y'2) voneinander abgekoppelt sind.
  2. Thermomagnetischer Auslöser (1) nach Anspruch 1, dadurch gekennzeichnet, dass er umfasst:
    - ein erstes elastisches Element (35), das die erste Übertragungsstange (31) in der ersten Richtung (S1) um die Schwenkachse (Y2-Y'2) in eine Ruheposition zieht,
    - ein zweites elastisches Element (36), das die zweite Übertragungsstange (32) in der ersten Richtung (S1) um die Schwenkachse (Y2-Y'2) in eine Ruheposition zieht,
    - ein drittes elastisches Element (34), das die Sperrraste (30) in der ersten Richtung (S1) um die Schwenkachse (Y2-Y'2) aus ihrer Freigabe- in ihre Verriegelungsposition zieht.
  3. Thermomagnetischer Auslöser nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die erste Übertragungsstange (31) mehrere Lager (50) aufweist, die auf die Trägerwelle (33) geschoben sind, sowie mindestens eine Verbindungsleiste (51), welche die ersten Lager (50) starr miteinander verbindet, die zweite Übertragungsstange (32) mehrere Lager (60) aufweist, die auf die Trägerwelle (33) geschoben sind, sowie mindestens eine zweite Verbindungsleiste (61), die die beiden Lager (60) starr miteinander verbindet, wobei erste und zweite Lager (50, 60) entlang der Schwenkachse (Y2-Y'2) versetzt zueinander angeordnet sind.
  4. Thermomagnetischer Auslöser nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die erste Übertragungsstange (31) erste Arme (52) umfasst, die so angeordnet sind, dass jedes thermische Betätigungselement (40) durch Einwirken auf einen dieser Arme (52) die erste Übertragungsstange (31) in der zweiten Richtung (S2) schwenken lassen kann.
  5. Thermomagnetischer Auslöser nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die zweite Übertragungsstange (32) zweite Arme (62) umfasst, die so angeordnet sind, dass jedes magnetische Betätigungselement (42) durch Einwirken auf einen dieser Arme (62) die zweite Übertragungsstange (32) in der zweiten Richtung (S2) schwenken lassen kann.
  6. Thermomagnetischer Auslöser nach Anspruch 3 und einem der Ansprüche 4 und 5, dadurch gekennzeichnet, dass jeder der Arme (52, 62) von einem der ersten und zweiten Lager (50, 60) getragen wird.
  7. Thermomagnetischer Auslöser nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass mindestens einer der ersten und zweiten Anzeigevorrichtung (11, 12) umfasst:
    - eine Öffnung (14), die durch ein Gehäuse (4, 5) des thermomagnetischen Auslösers führt, und
    - eine Erfassungsvorrichtung (15), die zwischen einem ersten Zustand, in dem sich kein Teil dieser Erfassungsvorrichtung (15) im Bereich der Öffnung (14) befindet, und einem zweiten Zustand hin und her bewegt werden kann, in dem die Erfassungsvorrichtung (15) zumindest teilweise von außen durch die Öffnung (14) sichtbar ist.
  8. Thermomagnetischer Auslöser nach Anspruch 7, dadurch gekennzeichnet, dass die Erfassungsvorrichtung (15) elastisch in den ersten Zustand zurückgezogen wird und einen elastisch flexiblen Finger (82) aufweist, der einen Vorsprung (84) trägt, der geeignet ist, die Erfassungsvorrichtung (15) in ihrem zweiten Zustand zu verriegeln, indem er in die Öffnung (14) eingreift.
EP13354040.1A 2012-11-19 2013-10-25 Thermomagnetischer Auslöser zur Auslösung eines Mehrphasen-Überlastschalters Active EP2733720B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1203098A FR2998415B1 (fr) 2012-11-19 2012-11-19 Declencheur magnetothermique de declenchement d'un disjoncteur polyphase

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EP2733720A1 EP2733720A1 (de) 2014-05-21
EP2733720B1 true EP2733720B1 (de) 2015-07-29

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CN (1) CN103824735B (de)
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FR (1) FR2998415B1 (de)

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US9024711B2 (en) 2015-05-05
FR2998415B1 (fr) 2015-01-16
CN103824735B (zh) 2017-08-15
ES2547344T3 (es) 2015-10-05
US20140139302A1 (en) 2014-05-22
EP2733720A1 (de) 2014-05-21
CN103824735A (zh) 2014-05-28
FR2998415A1 (fr) 2014-05-23

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