EP0466287A2 - Circuit breaker with an independant locking device of the movable contact - Google Patents

Circuit breaker with an independant locking device of the movable contact Download PDF

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Publication number
EP0466287A2
EP0466287A2 EP91250158A EP91250158A EP0466287A2 EP 0466287 A2 EP0466287 A2 EP 0466287A2 EP 91250158 A EP91250158 A EP 91250158A EP 91250158 A EP91250158 A EP 91250158A EP 0466287 A2 EP0466287 A2 EP 0466287A2
Authority
EP
European Patent Office
Prior art keywords
shaft
lever
circuit breaker
latching
switching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91250158A
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German (de)
French (fr)
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EP0466287A3 (en
EP0466287B1 (en
Inventor
Günter Dipl.-Ing. Seidler-Stahl
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Siemens AG
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Siemens AG
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Publication date
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Publication of EP0466287A2 publication Critical patent/EP0466287A2/en
Publication of EP0466287A3 publication Critical patent/EP0466287A3/en
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Publication of EP0466287B1 publication Critical patent/EP0466287B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism
    • H01H2071/507—Latching devices between operating and release mechanism being collapsible, e.g. yielding elastically, when the opening force is higher than a predetermined value
    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism

Definitions

  • the invention relates to a circuit breaker with a fixed switching contact and a movable switching contact that can be actuated relative to it by a drive device for switching on and off, and with a tripping device for automatic separation of the switching contacts when a current of impermissible height occurs, wherein a mechanical part of the tripping device rotates one mounted trigger shaft and a ratchet lever which can be supported on the trigger shaft with interacting latching surfaces are arranged, and furthermore a latching device which is independent of the triggering device is provided for releasing the movable switching contact under the influence of a faulty high current.
  • a circuit breaker of this type is known from US-A-4,760,224.
  • the independent latching device is formed in this circuit breaker by a spring-loaded roller and a cam with a locking step for the roller.
  • This arrangement is located in the course of the power transmission between the ratchet lever which can be supported by the release shaft and a toggle lever system which transmits the driving force to the movable contact lever.
  • this arrangement is provided only once, so that the independent latching device responds when the sum of the repulsive force occurring on all movable contact levers present exceeds the holding force of the latching device.
  • the invention is based on the object of substantially designing the independent latching device to simplify and at the same time ensure the repeatability of the value of the force at which the latching device is released.
  • this object is achieved in that the release shaft is guided along guide parts against a restoring force while reducing the overlap between the latching surfaces provided on the release shaft and the ratchet lever.
  • the essential simplification is achieved in that the new latching device does not require a cam disk or a roller, because the existing latching point between the trigger shaft and the latch lever is also used for the force-dependent release. Since precision parts are always used at this point, their reliability also has an effect on force-dependent unlatching.
  • a toggle lever supported by the ratchet lever of a toggle lever system arranged in the course of the power transmission to the movable switching contact is provided with a support surface which is concentric with its pivot bearing in such an arrangement that the trigger shaft during power transmission when switched on is supported against displacement along the guide parts. The temporary support is released at the end of the reset process, so that the readiness for all intended functions is restored.
  • the trigger shaft can have a latching surface designed as a half-shaft.
  • the displaceability of the trigger shaft can be brought about in that the trigger shaft is guided in elongated holes arranged on both sides of the latching surface and is supported by leaf springs.
  • the rotatability and displaceability of the trigger shaft is achieved in a simple and reliable manner.
  • Figure 1 shows partially in section the switching mechanism of a low-voltage circuit breaker with open switch contacts.
  • FIG. 2 shows the switching mechanism according to FIG. 1 with closed switching contacts.
  • FIG. 3 shows the switching mechanism according to the preceding figures after unlatching due to a faulty high current.
  • an isolated, supported switching contact 1 which has a switching piece 2 and an arcing horn 4.
  • a connecting bar 5 forms the power supply to this switch contact.
  • a movable switching contact 6 comprises a contact lever 7 with a contact piece 10.
  • the contact lever 7 is pivotable on a carrier 12 about a hinge pin 13, while the carrier 12 is in turn pivotable about a fixed hinge pin 14.
  • a flexible current band 15 composed of a plurality of thin foils forms a movable connection between the lower end of the contact lever 7 and a further stationary connecting rail 16.
  • the two connecting rails 5 and 16 are fastened to an insulating support body 17.
  • a quenching chamber 8 assigned to the switching contacts 1 and 6 is shown broken off.
  • a drive device designated as a whole by 18, is provided for actuating the movable switching contact 6.
  • This comprises an energy store 20 having helical springs and a multi-unit toggle lever system with an upper isolating coupling 21, two middle toggle levers 22 and 23 and a drive lever 24.
  • a driver 25 is inserted between the energy store 20 and the drive lever 24.
  • a support lever 26 acts on the joint between the middle toggle levers 22 and 23, the other end of which is connected in an articulated manner to a stationary latch lever 27.
  • a flat latching surface 30 at the end of the latch lever 27 is opposite a latching surface 32 of a release shaft 31 which is designed as a half-shaft.
  • the trigger shaft 31 is guided on both sides of the latching surface 32 in an elongated hole 40 and is supported by a leaf spring 41 which is supported in a stationary manner at both ends.
  • the elongated holes can be located in boards that limit the toggle lever arrangement, or in separate wall parts.
  • the leaf spring 41 is dimensioned such that it supports the force transmitted in the switched-on state from the toggle lever system via the support lever 26 and the ratchet lever 27 due to the lever ratios.
  • the drive lever 24 has a support surface 42 which is arranged concentrically with a stationary bearing pin 43. In the position of the parts according to FIG. 1, the beginning of this support surface 42 is below the trigger shaft 31, while in the switch-on position according to FIG.
  • the support surface 42 is completely moved past the trigger shaft 31.
  • the trigger shaft 31 is rotated clockwise by a small angle. This can be done, for example, by means of a conventional triggering device, which comprises a combined magnetic-thermal trigger or an electronic trigger having the same and further functions, and a trigger magnet.
  • a conventional triggering device which comprises a combined magnetic-thermal trigger or an electronic trigger having the same and further functions, and a trigger magnet.
  • the latching surface 30 loses its support on the latching surface 32 of the trigger shaft 31, so that contact force and switch-off springs (not shown) acting on the movable switching contact 7 and the toggle lever system can buckle. The parts then assume the position shown in FIG. 3.
  • the same effect can also occur if electrodynamic repulsive forces caused by a high fault current between the switching contacts 1 and 6 increase the force acting on the latching surfaces 30 and 32 in such a way that the trigger shaft 31 along the guide formed by the elongated holes 40 counteracts the Preload force of the leaf spring 41 is shifted. Since the pawl lever 27 is pivotable about a rotary bearing while the trigger shaft 31 is guided in a straight slot guide, the overlap between the two changes when the trigger shaft 31 is displaced Latching surfaces 30 and 32 to the extent that the latch lever 27 is released, thereby immediately separating the switching contacts 1 and 6 independently of a triggering device acting on the switching shaft 31.
  • the circuit breaker is able to react to faulty high currents with a current-limiting opening in its switching contacts. This process begins much more quickly than the rotation of the trigger shaft caused by a conventional trigger device.
  • the decisive factor here is the total force occurring between the latching surfaces 30 and 32, which not only results from the switching contacts 1 and 6 shown, but also from the further switch poles due to the transmission by means of the switching shaft 36 and the crank arms 35. The position of the parts according to FIG. 3 again occurs.
  • the switching mechanism 20 is prepared for renewed engagement by resetting the pawl lever 27 with the support lever 26 and the toggle levers 22 and 23 until the latching surfaces 30 and 32 face each other again.
  • the trigger shaft 31 When the trigger shaft 31 is switched on, it is prevented from deflecting against the pretensioning force of the leaf spring 41 by the support surface 42 of the drive lever 24 passing beneath it, so that a reliable switch-on can take place.
  • the biasing force of the leaf spring 41 alone is sufficient.
  • the support surface 42 is then again outside the area in which the trigger shaft 31 is displaceable.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

A circuit breaker has a trip device for the automatic separation of contacts (1, 6) and a locking device, which is independent of the trip device, for separating the contacts (1, 6) in the event of an erroneously high current. In addition to a trip shaft (31), which is required for the trip device, and a locking lever (27) interacting therewith, the independent locking device has an elongated hole (40) and a leaf spring (41) against which the trip shaft (31) can be displaced in the elongated hole (40). The trip shaft (31) is moved in the elongated hole (40) under the influence of an electrodynamic ejection force between the contacts (1, 6). At the same time, the locking surfaces (30, 31) slide off from one another. The locking device described is suitable for low-voltage circuit breakers of single-pin or multi-pin design which operate to limit the current. <IMAGE>

Description

Die Erfindung betrifft einen Leistungsschalter mit einem feststehenden Schaltkontakt und einem relativ zu diesem durch eine Antriebsvorrichtung zum Ein- und Ausschalten betätigbaren bewegbaren Schaltkontakt sowie mit einer Auslösevorrichtung zur selbsttätigen Trennung der Schaltkontakte beim Auftreten eines Stromes unzulässiger Höhe, wobei in einem mechanischen Teil der Auslösevorrichtung eine drehbar gelagerte Auslösewelle und ein an der Auslösewelle abstützbarer Klinkenhebel mit zusammenwirkenden Verklinkungsflächen angeordnet sind und wobei ferner eine von der Auslösevorrichtung unabhängige Verklinkungseinrichtung zur Freigabe des bewegbaren Schaltkontaktes unter dem Einfluß eines fehlerhaft hohen Stromes vorgesehen ist.The invention relates to a circuit breaker with a fixed switching contact and a movable switching contact that can be actuated relative to it by a drive device for switching on and off, and with a tripping device for automatic separation of the switching contacts when a current of impermissible height occurs, wherein a mechanical part of the tripping device rotates one mounted trigger shaft and a ratchet lever which can be supported on the trigger shaft with interacting latching surfaces are arranged, and furthermore a latching device which is independent of the triggering device is provided for releasing the movable switching contact under the influence of a faulty high current.

Ein Leistungsschalter dieser Art ist durch die US-A-4 760 224 bekannt geworden. Die unabhängige Verklinkungseinrichtung ist bei diesem Leistungsschalter durch eine federbelastete Rolle und eine Kurvenscheibe mit einer Raststufe für die Rolle ausgebildet. Diese Anordnung befindet sich im Zuge der Kraftübertragung zwischen dem durch die Auslösewelle abstützbaren Klinkenhebel und einem die Antriebskraft auf die bewegbaren Kontakthebel übertragenden Kniehebelsystem. Bei einem mehrpoligen Leistungsschalter ist diese Anordnung nur einmal vorgesehen, so daß die unabhängige Verklinkungseinrichtung dann anspricht, wenn die Summe der an alien vorhandenen bewegbaren Kontakthebeln auftretenden abstoßenden Kraft die Haltekraft der Verklinkungseinrichtung überschreitet.A circuit breaker of this type is known from US-A-4,760,224. The independent latching device is formed in this circuit breaker by a spring-loaded roller and a cam with a locking step for the roller. This arrangement is located in the course of the power transmission between the ratchet lever which can be supported by the release shaft and a toggle lever system which transmits the driving force to the movable contact lever. In the case of a multi-pole circuit breaker, this arrangement is provided only once, so that the independent latching device responds when the sum of the repulsive force occurring on all movable contact levers present exceeds the holding force of the latching device.

Der Erfindung liegt ausgehend von einem Leistungsschalter der vorstehend erläuterten Art die Aufgabe zugrunde, die unabhängige Verklinkungseinrichtung in ihrem konstruktiven Aufbau wesentlich zu vereinfachen und zugleich die Wiederholbarkeit des Wertes der Kraft sicherzustellen, bei welcher die Verklinkungseinrichtung freigegeben wird.Starting from a circuit breaker of the type explained above, the invention is based on the object of substantially designing the independent latching device to simplify and at the same time ensure the repeatability of the value of the force at which the latching device is released.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß die Auslösewelle entlang Führungsteilen gegen eine Rückstellkraft unter Verringerung der Überdeckung zwischen den an der Auslösewelle und dem Klinkenhebel vorgesehenen Verklinkungsflächen verschiebbar geführt ist. Die wesentliche Vereinfachung wird dadurch erzielt, daß die neue Verklinkungseinrichtung weder Kurvenscheibe noch Rolle erfordert, weil die bereits vorhandene Verklinkungsstelle zwischen der Auslösewelle und dem Klinkenhebel gleichfalls für die kraftabhängige Freigabe benutzt wird. Da an dieser Stelle grundsätzlich Präzisionsteile eingesetzt werden, wirkt sich deren Zuverlässigkeit auch bei der kraftabhängigen Entklinkung aus.According to the invention, this object is achieved in that the release shaft is guided along guide parts against a restoring force while reducing the overlap between the latching surfaces provided on the release shaft and the ratchet lever. The essential simplification is achieved in that the new latching device does not require a cam disk or a roller, because the existing latching point between the trigger shaft and the latch lever is also used for the force-dependent release. Since precision parts are always used at this point, their reliability also has an effect on force-dependent unlatching.

Soll der Schaltmechanismus zur erneuten Einschaltung zurückgegestellt werden, so müssen die Verklinkungsflächen an der Auslösewelle und dem Klinkenhebel wieder zur Berührung gebracht werden. Anschließend können die Schaltkontakte durch Freigabe eines Energiespeichers wieder geschlossen werden. Damit dieser Vorgang zuverlässig abläuft, empfiehlt es sich, die Verschiebbarkeit der Auslösewelle vorübergehend zu blockieren, damit nicht durch eine plötzliche Last an der Auslösewelle die Verklinkung sogleich wieder gelöst wird. In vorteilhafter Weise ist eine solche Blockierung dadurch zu erreichen, daß ein durch den Klinkenhebel abgestützter Kniehebel eines im Zuge der Kraftübertragung zu dem bewegbaren Schaltkontakt angeordneten Kniehebelsystems mit einer zu seinem Schwenklager konzentrischen Stützfläche in solcher Anordnung versehen ist, daß während der Kraftübertragung beim Einschalten die Auslösewelle gegen eine Verschiebung entlang den Führungsteilen abgestützt ist. Die vorübergehende Abstützung wird am Ende des Rückstellvorganges wieder aufgehoben, so daß die Bereitschaft für alle vorgesehenen Funktionen wieder hergestellt ist.If the switching mechanism is to be reset to be switched on again, the latching surfaces on the release shaft and the latch lever must be brought into contact again. The switch contacts can then be closed again by releasing an energy store. To ensure that this process runs reliably, it is advisable to temporarily block the displaceability of the release shaft so that the latch is not immediately released again due to a sudden load on the release shaft. Such a blocking can advantageously be achieved in that a toggle lever supported by the ratchet lever of a toggle lever system arranged in the course of the power transmission to the movable switching contact is provided with a support surface which is concentric with its pivot bearing in such an arrangement that the trigger shaft during power transmission when switched on is supported against displacement along the guide parts. The temporary support is released at the end of the reset process, so that the readiness for all intended functions is restored.

In bekannter Weise kann die Auslösewelle eine als Halbwelle ausgebildete Verklinkungsfläche besitzen. Die Verschiebbarkeit der Auslösewelle kann dadurch bewirkt sein, daß die Auslösewelle in beiderseits der Verklinkungsfläche angeordneten Langlöchern geführt sowie durch Blattfedern abgestützt ist. Hierdurch ist die Drehbarkeit und Verschiebbarkeit der Auslösewelle auf einfache und zuverlässige Weise erreicht.In a known manner, the trigger shaft can have a latching surface designed as a half-shaft. The displaceability of the trigger shaft can be brought about in that the trigger shaft is guided in elongated holes arranged on both sides of the latching surface and is supported by leaf springs. As a result, the rotatability and displaceability of the trigger shaft is achieved in a simple and reliable manner.

Die Erfindung wird im folgenden anhand des in den Figuren dargestellten Ausführungsbeispieles näher erläutert.The invention is explained below with reference to the embodiment shown in the figures.

Die Figur 1 zeigt teilweise im Schnitt die Schaltmechanik eines Niederspannungs-Leistungsschalters mit geöffneten Schaltkontakten.Figure 1 shows partially in section the switching mechanism of a low-voltage circuit breaker with open switch contacts.

In der Figur 2 ist die Schaltmechanik gemäß der Figur 1 mit geschlossenen Schaltkontakten dargestellt.FIG. 2 shows the switching mechanism according to FIG. 1 with closed switching contacts.

Die Figur 3 zeigt die Schaltmechanik gemäß den vorangehenden Figuren nach der Entklinkung auf Grund eines fehlerhaften hohen Stromes.FIG. 3 shows the switching mechanism according to the preceding figures after unlatching due to a faulty high current.

In den Figuren ist ein isoliert abgestützter feststehender Schaltkontakt 1 gezeigt, der ein Schaltstück 2 sowie ein Lichtbogenhorn 4 aufweist. Eine Anschlußschiene 5 bildet die Stromzuführung zu diesem Schaltkontakt. Ein bewegbarer Schaltkontakt 6 umfaßt einen Kontakthebel 7 mit einem Schaltstück 10. Der Kontakthebel 7 ist an einem Träger 12 um einen Gelenkbolzen 13 schwenkbar, während der Träger 12 seinerseits um einen ortsfesten Gelenkbolzen 14 schwenkbar ist. Ein biegsames, aus mehreren dünnen Folien zusammengesetztes Stromband 15 bildet eine bewegbare Verbindung zwischen dem unterem Ende des Kontakthebels 7 und einer weiteren ortsfesten Anschlußschiene 16. Die beiden Anschlußschienen 5 und 16 an einem isolierenden Stützkörper 17 befestigt. Eine den Schaltkontakten 1 und 6 Zugeordnete Löschkammer 8 ist abgebrochen dargestellt.In the figures, an isolated, supported switching contact 1 is shown, which has a switching piece 2 and an arcing horn 4. A connecting bar 5 forms the power supply to this switch contact. A movable switching contact 6 comprises a contact lever 7 with a contact piece 10. The contact lever 7 is pivotable on a carrier 12 about a hinge pin 13, while the carrier 12 is in turn pivotable about a fixed hinge pin 14. A flexible current band 15 composed of a plurality of thin foils forms a movable connection between the lower end of the contact lever 7 and a further stationary connecting rail 16. The two connecting rails 5 and 16 are fastened to an insulating support body 17. A quenching chamber 8 assigned to the switching contacts 1 and 6 is shown broken off.

Für die Betätigung des bewegbaren Schaltkontaktes 6 ist eine als Ganzes mit 18 bezeichnete Antriebsvorrichtung vorgesehen. Diese umfaßt einen Schraubenfedern aufweisenden Energiespeicher 20 sowie ein mehrgliedriges Kniehebelsystem mit einer oberen Isolierkoppel 21, zwei mittleren Kniehebeln 22 und 23 sowie einem Treibhebel 24 besteht. Zwischen den Kraftspeicher 20 und den Treibhebel 24 ist ein Mitnehmer 25 eingefügt. Am Gelenk zwischen den mittleren Kniehebeln 22 und 23 greift ein Stützhebel 26 an, dessen anderes Ende gelenkig mit einem ortsfest gelagerten Klinkenhebel 27 verbunden ist. Eine ebene Verklinkungsfläche 30 am Ende des Klinkenhebels 27 steht einer als Halbwelle ausgebildeten Verklinkungsfläche 32 einer Auslösewelle 31 gegenüber.A drive device, designated as a whole by 18, is provided for actuating the movable switching contact 6. This comprises an energy store 20 having helical springs and a multi-unit toggle lever system with an upper isolating coupling 21, two middle toggle levers 22 and 23 and a drive lever 24. A driver 25 is inserted between the energy store 20 and the drive lever 24. A support lever 26 acts on the joint between the middle toggle levers 22 and 23, the other end of which is connected in an articulated manner to a stationary latch lever 27. A flat latching surface 30 at the end of the latch lever 27 is opposite a latching surface 32 of a release shaft 31 which is designed as a half-shaft.

Wenn die Verklinkungsflächen 30 und 32 gemäß der Figur 1 im Eingriff stehen, ist die Bewegbarkeit eines die Kniehebel 22 und 23 mit dem Stützhebel 26 verbindenden Gelenkbolzens 33 auf einen Kreisbogen um einen Gelenkstift 34 beschränkt, der den Stützhebel 26 und den Klinkenhebel 27 verbindet. Wird daher der Federspeicher 20 zum Einschalten freigegeben, so wird der Treibhebel 24 durch den Mitnehmer 25 entgegen dem Uhrzeigersinn geschwenkt, wodurch die Kette der Kniehebel gestreckt wird. Die Schaltkontakte 1 und 6 werden hierdurch zur Berührung gebracht. Zugleich wird mittels eines auf einer Schaltwelle 36 sitzenden Kurbelarmes 35, der zwischen der Isolierkoppel 21 und dem Kniehebel 22 angelenkt ist, die Schaltwelle 36 betätigt. Dem Kurbelarm 35 entsprechende weitere, auf der Schaltwelle 36 im Abstand angebrachte Kurbelarme übertragen auf diese Weise die Schaltbewegung auf weitere Systeme von Schaltkontakten mit dem beschriebenen Aufbau. Im eingeschalteten Zustand sind die Schaltkontakte sowie das Kniehebelsystem in der Figur 2 dargestellt.If the latching surfaces 30 and 32 are engaged according to FIG. 1, the mobility of an articulation pin 33 connecting the toggle levers 22 and 23 to the support lever 26 is limited to an arc around an articulation pin 34 which connects the support lever 26 and the pawl lever 27. Therefore, if the spring accumulator 20 is released for switching on, the drive lever 24 is pivoted counterclockwise by the driver 25, as a result of which the chain of the toggle levers is stretched. The switch contacts 1 and 6 are thereby brought into contact. At the same time, the control shaft 36 is actuated by means of a crank arm 35 which is seated on a control shaft 36 and which is articulated between the isolating coupling 21 and the toggle lever 22. In this way, further crank arms corresponding to the crank arm 35 and spaced on the switching shaft 36 transmit the switching movement to other systems of switching contacts with the structure described. When switched on, the switch contacts and the toggle lever system are shown in FIG. 2.

Die Auslösewelle 31 ist beidseitig der Verklinkungsfläche 32 in jeweils einem Langloch 40 geführt und durch eine an beiden Enden ortsfest abgestütze Blattfeder 41 unterstützt. Die Langlöcher können sich in Platinen befinden, welche die Kniehebelanordnung begrenzen, oder in gesonderten Wandteilen. Die Blattfeder 41 ist derart bemessen, daß sie die im eingeschalteten Zustand vom Kniehebelsystem über den Stützhebel 26 und den Klinkenhebel 27 aufgrund der Hebelverhältnisse übertragene Kraft abstützt. Für das Zusammenwirken mit der Auslösewelle 31 in einer noch zu beschreibenden Weise besitzt der Treibhebel 24 eine Stützfläche 42, die konzentrisch zu einem ortsfesten Lagerbolzen 43 angeordnet ist. In der Stellung der Teile gemäß der Figur 1 befindet sich der Anfang dieser Stützfläche 42 unterhalb der Auslösewelle 31, während in der Einschaltstellung gemäß der Figur 2 die Stützfläche 42 an der Auslösewelle 31 vollständig vorbeibewegt ist. Zur Trennung der Schaltkontakte 1 und 6 wird die Auslösewelle 31 um einen geringen Winkel im Uhrzeigersinn gedreht. Dies kann beispielsweise durch eine übliche Auslösevorrichtung geschehen, die einen kombinierten magnetisch-thermischen Auslöser oder einen die gleichen und weitere Funktionen aufweisenen elektronischen Auslöser sowie einen Auslösemagneten umfaßt. Bei einer Drehung der Auslösewelle 31 verliert die Verklinkungsfläche 30 ihre Abstützung an der Verklinkungsfläche 32 der Auslösewelle 31, so daß auf den bewegbaren Schaltkontakt 7 wirkende nichtgezeigte Kontaktkraft- und Ausschaltfedern und das Kniehebelsystem zum Einknicken bringen können. Die Teile nehmen dann die in der Figur 3 gezeigte Stellung ein.The trigger shaft 31 is guided on both sides of the latching surface 32 in an elongated hole 40 and is supported by a leaf spring 41 which is supported in a stationary manner at both ends. The elongated holes can be located in boards that limit the toggle lever arrangement, or in separate wall parts. The leaf spring 41 is dimensioned such that it supports the force transmitted in the switched-on state from the toggle lever system via the support lever 26 and the ratchet lever 27 due to the lever ratios. For the interaction with the release shaft 31 in a manner to be described later, the drive lever 24 has a support surface 42 which is arranged concentrically with a stationary bearing pin 43. In the position of the parts according to FIG. 1, the beginning of this support surface 42 is below the trigger shaft 31, while in the switch-on position according to FIG. 2 the support surface 42 is completely moved past the trigger shaft 31. To separate the switching contacts 1 and 6, the trigger shaft 31 is rotated clockwise by a small angle. This can be done, for example, by means of a conventional triggering device, which comprises a combined magnetic-thermal trigger or an electronic trigger having the same and further functions, and a trigger magnet. When the trigger shaft 31 rotates, the latching surface 30 loses its support on the latching surface 32 of the trigger shaft 31, so that contact force and switch-off springs (not shown) acting on the movable switching contact 7 and the toggle lever system can buckle. The parts then assume the position shown in FIG. 3.

Die gleiche Wirkung kann jedoch such dann eintreten, wenn durch einen hohen Fehlerstrom bewirkte elektrodynamische abstoßende Kräfte zwischen den Schaltkontakten 1 und 6 die an den Verklinkungsflächen 30 und 32 wirksame Kraft derart vergrößern, daß die Auslösewelle 31 entlang der durch die Langlöcher 40 gebildeten Führung entgegen der Vorspannkraft der Blattfeder 41 verschoben wird. Da der Klinkenhebel 27 um ein Drehlager schwenkbar ist, während die Auslösewelle 31 in einer geraden Langlochführung geführt ist, verändert sich bei der Verschiebung der Auslösewelle 31 die Überdeckung zwischen den Verklinkungsflächen 30 und 32 soweit, daß der Klinkenhebel 27 freigegeben und hierdurch unmittelbar die Trennung der Schaltkontakte 1 und 6 unabhängig von einer die Schaltwelle 31 beaufschlagenden Auslösevorrichtung getrennt werden. Der Leistungsschalter ist hierdurch in der Lage, auf fehlerhaft hohe Ströme mit einer strombegrenzenden Öffnung seiner Schaltkontakte zu reagieren. Dieser Vorgang setzt sehr viel rascher ein, als die durch eine übliche Auslösevorrichtung bewirkte Drehung der Auslösewelle. Maßgebend ist hierbei die gesamte zwischen den Verklinkungsflächen 30 und 32 auftretende Kraft, die nicht nur von den dargestellten Schaltkontakten 1 und 6, sondern aufgrund der Übertragung mittels der Schaltwelle 36 und der Kurbelarme 35 von den weiteren Schalterpolen herrührt. Es tritt wiederum die Stellung der Teile gemäß der Figur 3 ein.However, the same effect can also occur if electrodynamic repulsive forces caused by a high fault current between the switching contacts 1 and 6 increase the force acting on the latching surfaces 30 and 32 in such a way that the trigger shaft 31 along the guide formed by the elongated holes 40 counteracts the Preload force of the leaf spring 41 is shifted. Since the pawl lever 27 is pivotable about a rotary bearing while the trigger shaft 31 is guided in a straight slot guide, the overlap between the two changes when the trigger shaft 31 is displaced Latching surfaces 30 and 32 to the extent that the latch lever 27 is released, thereby immediately separating the switching contacts 1 and 6 independently of a triggering device acting on the switching shaft 31. As a result, the circuit breaker is able to react to faulty high currents with a current-limiting opening in its switching contacts. This process begins much more quickly than the rotation of the trigger shaft caused by a conventional trigger device. The decisive factor here is the total force occurring between the latching surfaces 30 and 32, which not only results from the switching contacts 1 and 6 shown, but also from the further switch poles due to the transmission by means of the switching shaft 36 and the crank arms 35. The position of the parts according to FIG. 3 again occurs.

Im Anschluß an eine Auslösung wird der Schaltmechanismus 20 für eine erneute Einschaltung dadurch vorbereitet, daß der Klinkenhebel 27 mit dem Stützhebel 26 und den Kniehebeln 22 und 23 zurückgestellt wird, bis sich die Verklinkungsflächen 30 und 32 wieder gegenüberstehen. Beim Einschalten wird die Auslösewelle 31 durch die unter ihr durchlaufende Stützfläche 42 des Treibhebels 24 am Ausweichen entgegen der Vorspannkraft der Blattfeder 41 gehindert, so daß eine sichere Einschaltung stattfinden kann. Zur Aufrechterhaltung der Antriebsvorrichtung 20 in der verklinkten Stellung bei geschlossenen Schaltkontakten 1 und 6 genügt die Vorspannkraft der Blattfeder 41 allein. Die Stützfläche 42 steht dann wieder außerhalb des Bereiches, in dem die Auslösewelle 31 verschiebbar ist.Following a triggering, the switching mechanism 20 is prepared for renewed engagement by resetting the pawl lever 27 with the support lever 26 and the toggle levers 22 and 23 until the latching surfaces 30 and 32 face each other again. When the trigger shaft 31 is switched on, it is prevented from deflecting against the pretensioning force of the leaf spring 41 by the support surface 42 of the drive lever 24 passing beneath it, so that a reliable switch-on can take place. To maintain the drive device 20 in the latched position when the switch contacts 1 and 6 are closed, the biasing force of the leaf spring 41 alone is sufficient. The support surface 42 is then again outside the area in which the trigger shaft 31 is displaceable.

Claims (3)

Leistungsschalter mit einem feststehenden Schaltkontakt (1) und einem relativ zu diesem durch eine Antriebsvorrichtung (18) zum Ein- und Ausschalten betätigbaren bewegbaren Schaltkontakt (6) sowie mit einer Auslösevorrichtung zur selbsttätigen Trennung der Schaltkontakte (1, 6) beim Auftreten eines Stromes unzulässiger Höhe, wobei in einem mechanischen Teil der Auslösevorrichtung eine drehbar gelagerte Auslösewelle (31) und ein an der Auslösewelle (31) abstützbarer Klinkenhebel (27) mit zusammenwirkenden Verklinkungsflächen (30, 32) angeordnet sind und wobei ferner eine von der Auslösevorrichtung unabhängige Verklinkungseinrichtung zur Freigabe des bewegbaren Schaltkontaktes (6) unter dem Einfluß eines fehlerhaft hohen Stromes vorgesehen ist,
dadurch gekennzeichnet, daß die Auslösewelle (31) entlang Führungsteilen (40) gegen eine Rückstellkraft unter Verringerung der Überdeckung zwischen den an der Auslösewelle (31) und dem Klinkenhebel (27) vorgesehenen Verklinkungsflächen (30, 32) verschiebbar geführt ist.Circuit breaker with a fixed switching contact (1) and a movable switching contact (6) that can be actuated relative to it by a drive device (18) for switching on and off, and with a tripping device for automatic disconnection of the switching contacts (1, 6) when a current of impermissible height occurs , In a mechanical part of the release device, a rotatably mounted release shaft (31) and a ratchet lever (27) which can be supported on the release shaft (31) and have interacting latching surfaces (30, 32) are arranged, and furthermore a latching device which is independent of the release device for releasing the movable switching contact (6) is provided under the influence of a faulty high current,
characterized in that the release shaft (31) is guided displaceably along guide parts (40) against a restoring force while reducing the overlap between the latching surfaces (30, 32) provided on the release shaft (31) and the ratchet lever (27). Leistungsschalter nach Anspruch 1, dadurch gekennzeichnet, daß ein durch den Klinkenhebel (27) abgestützter Kniehebel (Treibhebel 24) eines im Zuge der Kraftübertragung zu dem bewegbaren Schaltkontakt (6) angeordneten Kniehebelsystems (21, 22, 23, 24) mit einer zu seinem Schwenklager (43) konzentrischen Stützfläche (42) in solcher Anordnung versehen ist, daß während der Kraftübertragung zum Einschalten die Auslösewelle (31) gegen eine Verschiebung entlang den Führungsteilen (40) abgestützt ist.Circuit breaker according to claim 1, characterized in that a toggle lever (drive lever 24) supported by the ratchet lever (27) of a toggle lever system (21, 22, 23, 24) arranged in the course of the power transmission to the movable switching contact (6) with one to its pivot bearing (43) concentric support surface (42) is provided in such an arrangement that the trigger shaft (31) is supported against displacement along the guide parts (40) during power transmission for switching on. Leistungsschalter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Auslösewelle (31) eine als Halbwelle ausgebildete Verklinkungsfläche (32) besitzt und in beiderseits der Verklinkungsfläche (32) angeordneten Langlöchern (40) geführt sowie durch Blattfedern (41) abgestützt ist.Circuit breaker according to Claim 1 or 2, characterized in that the tripping shaft (31) has a latching surface (32) designed as a half-shaft and is guided in elongated holes (40) arranged on both sides of the latching surface (32) and by leaf springs (41) is supported.
EP91250158A 1990-07-10 1991-06-13 Circuit breaker with an independant locking device of the movable contact Expired - Lifetime EP0466287B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4022078 1990-07-10
DE4022078A DE4022078A1 (en) 1990-07-10 1990-07-10 CIRCUIT BREAKER WITH INDEPENDENT INTERLOCKING DEVICE OF THE MOVABLE SWITCHING CONTACT

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EP0466287A2 true EP0466287A2 (en) 1992-01-15
EP0466287A3 EP0466287A3 (en) 1993-04-21
EP0466287B1 EP0466287B1 (en) 1995-01-18

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EP91250158A Expired - Lifetime EP0466287B1 (en) 1990-07-10 1991-06-13 Circuit breaker with an independant locking device of the movable contact

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EP (1) EP0466287B1 (en)
JP (1) JPH04351824A (en)
DE (2) DE4022078A1 (en)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO1997000531A1 (en) * 1995-06-19 1997-01-03 Siemens Aktiengesellschaft Device for protection against overload of the switching contacts of a switching device
FR2744563A1 (en) * 1996-02-06 1997-08-08 Schneider Electric Sa MECHANISM FOR CONTROLLING A BREAKABLE LATCH CIRCUIT BREAKER OVER A SHORT CIRCUIT
WO2005029526A1 (en) * 2003-09-19 2005-03-31 Siemens Aktiengesellschaft Electrical switch having latching surfaces that can be pivoted under the influence of electrodynamic force

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DE9206137U1 (en) * 1992-05-07 1993-09-09 Siemens Ag Circuit breaker with a switch lock
DE4221277A1 (en) * 1992-06-26 1994-01-05 Siemens Ag Low-voltage circuit breaker with a latching device to keep the contact arrangement open
DE19527045C2 (en) * 1995-07-25 2002-02-14 Abb Patent Gmbh Contact arrangement for an electrical switching device
DE19727853C1 (en) * 1997-06-26 1998-11-26 Siemens Ag Low-voltage circuit breakers with one switching shaft
DE19910172B4 (en) * 1999-02-24 2006-07-06 Siemens Ag Circuit breaker with current-limiting opening of switching contacts
DE29921347U1 (en) * 1999-11-30 2001-04-05 Siemens Ag Circuit breaker with current-limiting opening of a switch contact
DE10164517B4 (en) * 2001-12-19 2004-02-19 Siemens Ag Current-limiting low-voltage circuit breaker
DE102007001471A1 (en) * 2007-01-05 2008-07-10 Siemens Ag Electrical switching device for use in low-voltage circuit-breaker, has contact lever linearly guided for closing interfaces during switching movement of lever in point and guided in rotation movement of lever in same point

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EP0072972A2 (en) * 1981-08-22 1983-03-02 Licentia Patent-Verwaltungs-GmbH Automatic switch
EP0197739A2 (en) * 1985-03-28 1986-10-15 Mitsubishi Denki Kabushiki Kaisha Air circuit interrupter

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EP0072972A2 (en) * 1981-08-22 1983-03-02 Licentia Patent-Verwaltungs-GmbH Automatic switch
EP0197739A2 (en) * 1985-03-28 1986-10-15 Mitsubishi Denki Kabushiki Kaisha Air circuit interrupter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997000531A1 (en) * 1995-06-19 1997-01-03 Siemens Aktiengesellschaft Device for protection against overload of the switching contacts of a switching device
US5933303A (en) * 1995-06-19 1999-08-03 Siemens Aktiengesellschaft Device for protection against overload of the switch contacts of a switching device
FR2744563A1 (en) * 1996-02-06 1997-08-08 Schneider Electric Sa MECHANISM FOR CONTROLLING A BREAKABLE LATCH CIRCUIT BREAKER OVER A SHORT CIRCUIT
EP0789380A1 (en) * 1996-02-06 1997-08-13 Schneider Electric Sa Operating mechanism for a circuit breaker with a latch disengageable by a short circuit
US5731560A (en) * 1996-02-06 1998-03-24 Schneider Electric Sa Operating mechanism of a circuit breaker with a locking system disengageable on a short circuit
WO2005029526A1 (en) * 2003-09-19 2005-03-31 Siemens Aktiengesellschaft Electrical switch having latching surfaces that can be pivoted under the influence of electrodynamic force

Also Published As

Publication number Publication date
DE59104298D1 (en) 1995-03-02
DE4022078A1 (en) 1992-01-16
JPH04351824A (en) 1992-12-07
EP0466287A3 (en) 1993-04-21
EP0466287B1 (en) 1995-01-18

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