EP1328956B1 - Current limiting low-voltage power circuit breaker - Google Patents
Current limiting low-voltage power circuit breaker Download PDFInfo
- Publication number
- EP1328956B1 EP1328956B1 EP01964861A EP01964861A EP1328956B1 EP 1328956 B1 EP1328956 B1 EP 1328956B1 EP 01964861 A EP01964861 A EP 01964861A EP 01964861 A EP01964861 A EP 01964861A EP 1328956 B1 EP1328956 B1 EP 1328956B1
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- EP
- European Patent Office
- Prior art keywords
- contact
- levers
- circuit breaker
- latching device
- switching contact
- 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.)
- Expired - Lifetime
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Classifications
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- 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
- H01H77/102—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 characterised by special mounting of contact arm, allowing blow-off movement
- H01H77/104—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 characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position
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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
- H01H71/10—Operating or release mechanisms
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
- H01H71/528—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a toggle or collapsible link between handle and contact arm, e.g. sear pin mechanism
Definitions
- One of these principles is to cause the lifting contact forces to be effective at high currents before a normal mechanical latch is released in the switch drive. This is due to the fact that any stumping contact by the current forces a repulsive effect and if the contacts are not held together by external forces, they lift off at a certain amperage. With the opening of the contacts then the switching mechanism must be brought into the open position and the contact carrier with the switching mechanism to be locked again. It is desirable that, where appropriate, a single pole of a multi-pole circuit breaker is brought under the influence of these forces to open, while the others still remain closed, because just this one pole carries the high current.
- the process described can be realized in different ways. For low demands, if the switching mechanism is particularly well, especially with low mass of moving parts, it is sufficient to release it in three poles. But it is better, as already mentioned, to effect a single-pole interruption of the affected current path, because a higher current limiting factor is thereby achieved.
- the FR-PS 721 451 describes a DC-circuit breaker in which the current forces are generated by a separate from the contact system, responsive to a current increase electromechanical transducer.
- AT-PS 250 479 is a current-limiting switch has become known, the movable lever is held in the closed position by a latch, which is solvable both by means of an induced by electrodynamic forces movement of the movable lever and by an electromagnetic overcurrent release. The transmission of the release movement of the overcurrent release on the Verklinkungsstelle done by several intermediate links.
- DE-PS 1 801 071 is a low-voltage circuit breaker with a loop-shaped flow path, which generates diverging contact-opening forces, shown in which is moved by the occurring at very high overcurrents, electrodynamic forces in the contact system, the shift lever against the force of a spring.
- a rod On the movable contact lever, a rod is provided, which is supported with a roller on a locking member. Through this locking member, which in turn is displaceable against spring force and a role, a latch lever is moved and released, whereby the shift lever can be brought into the Ausschaltlage.
- the DE 15 13 341 A1 describes another such circuit breaker in which a repulsive effect between the two contact elements comes about at a high short-circuit current due to the electrodynamic forces.
- a repulsive effect between the two contact elements comes about at a high short-circuit current due to the electrodynamic forces.
- a support lever is rotated.
- the release shaft is rotated, which causes a unlatching of the switching mechanism.
- the DE 25 11 948 A1 describes a switch in which a lever arrangement for direct unlatching of the switching mechanism is actuated by an electrodynamic opening movement of the movable contact piece immediately after the contact opening and with increasing contact spring force.
- the movable contact piece is rotatably mounted on a support and pressed in the closed position of a carrier supported on the contact force spring against the fixed contact piece.
- the carrier is mounted on a fixed pivot point and locked rigidly in the on state by the switching mechanism.
- the opening movement of the movable contact piece for unlocking the carrier is passed via a lever arrangement on the switching mechanism and on the lock of the carrier.
- an articulated lever connection is provided as the connection between the movable contact lever carrier and the switching shaft, which is formed by mutually articulated part flaps is, which are acted upon by a spring so that they occupy a stretched position.
- the movable contact lever carrier is not, as usual, rigid, but connected by a, preferably formed by a shaft pivot bearing with its support levers, so that it can perform a pivoting movement.
- the movable contact lever carrier is further provided in the region of the contact lever shaft passing through it in normal switches with recesses which are formed so that its pivotal movement is not hindered by this contact lever shaft.
- the object of the invention is therefore to propose a current-limiting low-voltage circuit breaker, which can be derived without significant design and manufacturing effort from a normal standard switch, without having to be made to this significant changes.
- Conventional switches have a movable switching pole with a switching contact with a switch drive and between a lever chain which connects the switching shaft and the contact carrier, so that it is advisable to incorporate in the train of the lever chain an element having a mechanically non-linear characteristic, in that the Lever chain regardless of the shift shaft yields, kinks or buckle, if pressed by the current-carrying forces of the contact carrier against the lever chain.
- the above object of the invention is achieved in that the previously executed as a lever chain power transmission from the switch drive to the contact carrier is structurally completely redesigned, insofar as it is constructed as a kind of articulated link.
- the hinge pin expediently has at one end a head as an abutment for the pressure spring and at its other end a thread for a nut.
- Serving as a toothing when loading the Verklinkungs adopted in the direction of rotation of the lever toward each other to moving inclined surfaces are formed with steep flanks as snap surfaces and the loading of the Verklinkungs adopted in the direction of rotation of the lever away from each other moving inclined surfaces have flat flanks as sliding surfaces.
- the pressure spring is advantageously formed as the hinge pin enclosing and supported on the head of the hinge pin helical compression spring.
- the axis of the joint connecting the lever is expediently arranged parallel to a pivot axis of the movable switching contact.
- the force exerted by the pressure spring on the contact surfaces of the lever on the concentric parts in the region of the joint with the teeth acting as teeth inclined pressure is adjustable by changing the effective length of the hinge pin.
- the latching device provides a new assembly for the force-transmitting connection of the switching shaft lever with the switching contact or the contact carrier. It is designed as a force-dependent buckling element, which makes it possible that, when a short-circuit current occurs, each switching unit opens independently of one another and independently of the ON position of the switching shaft.
- the two levers of Verklinkungs are identical. So it is only one part of production.
- the latching device according to the invention is not, as in known embodiments, telescoped together, but there is a rotary bending movement. If in the further course of the shutdown of the electromagnetic quick release switches off the switch finally, the Verklinkungs engaged is returned to its rest position by the rotating shaft and its switching shaft lever. The switch is ready to switch on again.
- the Fig. 1 schematically shows a low-voltage circuit breaker with the latching device according to the invention in a sectional view in the off state.
- the Fig. 2 schematically shows a low-voltage circuit breaker with the latching device according to the invention in a sectional view in the on state.
- the Fig. 3 schematically shows a low-voltage circuit breaker with the latching device according to the invention in a sectional view in the tripped state.
- the Fig. 4 shows a preferred embodiment of the latching device according to the invention in side view.
- the Fig. 5 shows a single lever of Verklinkungs worn according to the invention according to the Fig. 4 in the plan view.
- the Fig. 6 shows the Verklinkungs Healthy according to the invention according to the Fig. 1 partially assembled.
- a low-voltage circuit breaker 1 is shown in section to illustrate the location of the Verklinkungs worn 13 according to the invention.
- the upper connecting rail 3 and the lower connecting rail 4 are passed.
- the fixed switching contact 5 and the lower connecting rail 4 is connected via flexible connections 6 of the located on a contact carrier 7 movable switch contact 8.
- the arc extinguishing chamber 9 is arranged.
- the switch drive 10 is the Shift shaft 11 with the switching shaft lever 12, to which the Verklinkungs worn 13 according to the invention is attached as a connecting element to the contact carrier 7.
- Fig. 1 stand in the off state of the low-voltage circuit breaker 1, the lever 14, 15 in the rest state of Verklinkungs adopted 13 for generating a dependent on the opening force relative torque in an angle different from each other at the extended position, wherein the axis of the lever 14, 15 connecting joint 16 is arranged parallel to a pivot axis, not shown, of the movable switching contact 8.
- the same constellation only in the on state of the low-voltage circuit breaker 1 shows the Fig.2 while in the Figure 3 the low-voltage circuit breaker 1 is shown with the Verklinkungs worn 13 in the tripped state in which the Verklinkungs recruited 13 is folded and an opening of the movable contact 8 is carried out.
- the Fig. 4 shows a preferred embodiment of the latching device 13 according to the invention in the side view. It has two identically designed lever 14; 15, which are interconnected by a hinge 16 and pivotable about the hinge 16 relative to each other.
- the contact surfaces of the lever 14; 15 included as inclined surfaces 17; 18 trained work surfaces, which in the form of a toothing of the concentric parts 19; 20 are formed.
- the inclined surface 17 is formed steeply as a snap surface and the inclined surface 18 flat as a sliding surface.
- the levers 14; 15 connecting joint 16 is through an aligned through holes 21; 22, the lever 14; 15 passing through hinge pin 23 is formed, which at the same time Guide and the holder for the trained as a helical compression spring pressure spring 24 forms, which surrounds the hinge pin 23 and the same is supported at the end of the hinge pin 23 by a disc-shaped head 25 thereof.
- a thread 26 for receiving a nut 27 is provided, by means of which the voltage of the seated on the hinge pin 23 pressure spring 24 is variable.
- the two levers 14; 15 are thus under the variable spring pressure of the pressure spring 24.
- the levers 14, 15 each with a through hole 28, 29 provided recordings 30; 31, which serve for connection to the switching shaft lever 12 and the contact carrier 7.
- the Fig. 5 shows a single lever of Verklinkungs worn according to the invention according to the Fig. 4 in the plan view.
- the two levers 14; 15 are formed identically, which is why only one lever 15 is shown.
- As inclined surfaces 17; 18 trained working surfaces of the lever 15 are arranged concentrically around the through hole 22 for the hinge pin 23 in the concentric part 20.
- At the opposite end of the lever 15 which is provided with a through hole 29 receptacle 31 is arranged, which serves for connection to the switching shaft lever 12 and the contact carrier 7.
- the Fig. 6 shows the Verklinkungs worn 13 according to the invention according to the Fig. 1 partially assembled with the nut 27 omitted.
- this illustration in which like parts corresponding to Fig. 1 are provided with the same reference numerals, is clearly the formation of the inclined surfaces 17; 18 as a toothing of the concentric parts 19; 20 to recognize which is in the mounted state under the spring pressure of the seated on the hinge pin 23 pressure spring 24.
- the spring force of the pressure spring 24 is easily adjusted by changing the effective length of the hinge pin 23 by more or less wide screwing the nut 27 and thus the functional force of Verklinkungs worn 13 adjustable.
- the arrangement according to the invention is mechanically very simple and yet has the advantage that the functional force is easily adjustable.
- the two levers 14, 15 are identical, so it is manufacturing moderate only one part to produce.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Description
Die Erfindung betrifft einen strombegrenzenden Niederspannungs-Leistungsschalter mit einem durch ein Schaltschloß verklinkbaren Kontaktsystem, das pro Phase mindestens ein bewegbares und ein festes Kontaktelement aufweist, dessen bewegliches Kontaktelement bei auftretenden hohen Strömen, zum Beispiel bei Kurzschlüssen, infolge elektrodynamischer Kräfte entgegen der Wirkung einer Kontaktkraftfeder abhebt, welcher folgende Merkmale aufweist:
- eine Antriebsvorrichtung zur Überführung des Schaltkontaktes in
eine Einschaltstellung und in eine Ausschaltstellung, - eine im Zuge der Kraftübertragung von der Antriebsvorrichtung zum Schaltkontakt angeordnete Verklinkungseinrichtung,die ausgehend von der Einschaltstellung des Schaltkontaktes durch eine vom Schaltkontakt ausgehende und in der Richtung der Ausschaltstellung wirkende Öffnungskraft lösbar ist, wenn die Öffnungskraft einen vorgegebenen Grenzwert überschreitet, wobei diese Verklinkungseinrichtung als mechanisches Verbindungsglied zwischen der Antriebsvorrichtung und dem bewegbaren Schaltkontakt ausgebildet ist und wenigstens zwei zusammenwirkende, winklig zur Richtung der Öffnungskraft angeordnete Arbeitsflächen und eine auf die Arbeitsflächen wirkende Andruckfeder aufweist.
- a drive device for transferring the switching contact in
a switch-on position and a switch-off position, - a arranged in the course of the power transmission from the drive device to the switching contact latching device, which is based on the switch-on of the switching contact by an outgoing from the switching contact and acting in the direction of the open position opening force is releasable when the opening force exceeds a predetermined limit, said Verklinkungseinrichtung as a mechanical link is formed between the drive device and the movable switch contact and has at least two cooperating, arranged at an angle to the direction of the opening force working surfaces and acting on the work surfaces pressure spring.
Bei strombegrenzenden Niederspannungs-Leistungsschaltern werden extrem kurze Auslösezeiten von wenigen Millisekunden angestrebt. Die normalen Auslösezeiten bei Leistungsschaltern sind länger, denn beim klassischen Aufbau eines dynamisch festen, d. h. mit selektiv staffelbarer Auslösung arbeitenden Leistungsschalters ist das Kontaktsystem in sich völlig starr. Die Kontakte bleiben geschlossen, bis sie an anderer Stelle freigegeben werden. Der Auslösemagnet muss zum Ansprechen gebracht werden, was eine verhältnismäßig lange Zeit in Anspruch nimmt und es muss dazu eine komplette Schaltmechanik freigegeben werden, in der eine relativ große Anzahl von Teilen bewegt werden muss. Daraus resultiert aber auch, dass der Schalter bezüglich der Stromführungsfähigkeit die hohe Belastung aushalten muss und nicht vorher durch Überhitzung beschädigt oder zerstört wird. Das kann dadurch umgangen werden, dass die elektrodynamischen Stromkräfte selbst zur Kontaktöffnung ausgenutzt werden. Dafür gibt es eine Reihe unterschiedlicher Prinzipien.Current-limiting low-voltage circuit breakers aim for extremely short tripping times of a few milliseconds. The normal tripping times for circuit breakers are longer, because with the classic structure of a dynamically fixed, that is, with selective gradual triggering circuit breaker, the contact system is completely rigid in itself. The contacts remain closed until they are released elsewhere. The trigger magnet must be made to respond, which takes a relatively long time and it must be released to a complete switching mechanism in which a relatively large number of parts must be moved. However, this also means that the switch has to withstand the high load with regard to the current-carrying capability and is not previously damaged or destroyed by overheating. This can be circumvented by exploiting the electrodynamic current forces themselves for contact opening. There are a number of different principles.
Eines dieser Prinzipien besteht darin, zu bewirken, dass die abhebenden Kontaktkräfte bei hohen Strömen zur Wirkung kommen können, bevor eine normale mechanische Verklinkung im Schalterantrieb freigegeben wird. Das beruht darauf, dass jeder stumpf aufeinander treffende Kontakt durch die Stromengekräfte eine abstoßende Wirkung erfährt und wenn die Kontakte nicht durch Fremdkräfte zusammengehalten werden, heben sie bei einer bestimmten Stromstärke ab. Mit dem Öffnen der Kontakte muss dann auch der Schaltmechanismus in die Ausschaltstellung gebracht und der Kontaktträger mit dem Schaltmechanismus wieder verriegelt werden. Dabei wird angestrebt, dass gegebenenfalls ein einzelner Pol eines mehrpoligen Leistungsschalters unter dem Einfluß dieser Kräfte zum Öffnen gebracht wird, während die anderen noch geschlossen bleiben, weil eben dieser eine Pol den hohen Strom führt. Wenn diese extrem schnelle Öffnung stattfindet, wird ein Schaltlichtbogen entstehen und dessen Widerstand ist im Vergleich zu den Widerständen der Strombahnen über die gesamte Fehlerstelle und den Schalter so groß, dass er strombegrenzend wirkt. Es kann also nicht die volle Höhe des Kurzschlußstromes erreicht werden.One of these principles is to cause the lifting contact forces to be effective at high currents before a normal mechanical latch is released in the switch drive. This is due to the fact that any stumping contact by the current forces a repulsive effect and if the contacts are not held together by external forces, they lift off at a certain amperage. With the opening of the contacts then the switching mechanism must be brought into the open position and the contact carrier with the switching mechanism to be locked again. It is desirable that, where appropriate, a single pole of a multi-pole circuit breaker is brought under the influence of these forces to open, while the others still remain closed, because just this one pole carries the high current. When this extremely fast opening takes place, a switching arc will arise and its resistance will be greater than that across the entire fault and the resistances of the current paths Switch so big that it has a current limiting effect. So it can not be reached the full height of the short-circuit current.
Der beschriebene Vorgang kann auf unterschiedliche Art realisiert werden. Bei geringen Anforderungen, wenn der Schaltmechanismus besonders gut, insbesondere mit geringer Masse der zu bewegenden Teile, aufgebaut ist, genügt es, ihn dreipolig freizugeben. Besser ist es aber, wie schon erwähnt, eine einpolige Unterbrechung der betroffenen Strombahn zu bewirken, weil dadurch ein höherer Strombegrenzungsfaktor erreicht wird.The process described can be realized in different ways. For low demands, if the switching mechanism is particularly well, especially with low mass of moving parts, it is sufficient to release it in three poles. But it is better, as already mentioned, to effect a single-pole interruption of the affected current path, because a higher current limiting factor is thereby achieved.
Die
In der
Eine andere Möglichkeit zur schnellen Kontaktöffnung auf Grund von Stromkräften ist in der
Die
Eine andere Lösung zur strombegrenzenden Abschaltung zeigt die
Die
In der
In der
Alle vorgenannten Schalter haben gemeinsam den Nachteil, dass für die Realisierung der Strombegrenzung eine Vielzahl zu bewegender Teile, teilweise auch nur für die Strombegrenzung zusätzlich erforderliche Bauelemente, vorhanden sind. Das ist mit hohem mechanischen und fertigungstechnischen Aufwand verbunden.All of the aforementioned switches have the common disadvantage that for the realization of the current limit, a plurality of moving parts, partially only for the current limiting additional required components are available. This is associated with high mechanical and manufacturing expense.
Darüber hinaus muss berücksichtigt werden, dass Kunden nicht nur einen derartigen Schaltertyp benötigen, sondern auch einen, der konventionell, also selektiv öffnet, also nur dann, wenn bei Auftreten eines hohen Stromes eine bestimmte Zeit verstrichen ist. Es ist aber sehr aufwendig, dem Kunden zwei ganz unterschiedlich aufgebaute Typen von Leistungsschaltern anzubieten, denn es müssen zwei unterschiedliche Schalterkonstruktionen vorgehalten werden. Es kann also von beiden Typen jeweils nur die halbe Losgröße gefertigt werden. Die Kunden rüsten heute die Anlagen häufig um und benötigen deshalb preiswerte universell verwendbare Leistungsschalter.In addition, it must be taken into account that customers not only need such a type of switch, but also one that opens conventionally, ie selectively, ie only when a certain time has elapsed when a high current occurs. But it is very expensive, the customer two very differently constructed types of circuit breakers offer, because there are two different switch designs must be kept. It can be made of both types only half the lot size. Today's customers often retrofit the systems and therefore require inexpensive, universally applicable circuit breakers.
Das Bestreben die unterschiedlichen Funktionen, klassischer, selektiv zeitabhängig staffelbarer Leistungsschalter oder strombegrenzender Schalter, alternativ zur Verfügung zu haben, soll deshalb möglichst kostengünstig verwirklicht werden.The endeavor to have the different functions, classic, selectively time-dependent graduated power switch or current-limiting switch, alternatively available, should therefore be realized as inexpensively.
Die Aufgabe der Erfindung besteht folglich darin, einen strombegrenzenden Niederspannungs-Leistungsschalter vorzuschlagen, der ohne wesentlichen konstruktiven und fertigungstechnischen Aufwand aus einem normalen serienmäßigen Schalter abgeleitet werden kann, ohne dass an diesem wesentliche Veränderungen vorgenommen werden müssen. Herkömmliche Schalter haben einen beweglichen Schaltpol mit einem Schaltkontakt mit einem Schalterantrieb und dazwischen eine Hebelkette welche die Schaltwelle und den Kontaktträger verbindet, so dass es sich anbietet, in den Zug der Hebelkette ein Element einzubauen, das eine mechanisch nichtlineare Charakteristik aufweist, insofern, dass die Hebelkette unabhängig von der Schaltwelle nachgibt, ausknickt oder einknicken kann, wenn durch die stromabhebenden Kräfte der Kontaktträger gegen die Hebelkette drückt.The object of the invention is therefore to propose a current-limiting low-voltage circuit breaker, which can be derived without significant design and manufacturing effort from a normal standard switch, without having to be made to this significant changes. Conventional switches have a movable switching pole with a switching contact with a switch drive and between a lever chain which connects the switching shaft and the contact carrier, so that it is advisable to incorporate in the train of the lever chain an element having a mechanically non-linear characteristic, in that the Lever chain regardless of the shift shaft yields, kinks or buckle, if pressed by the current-carrying forces of the contact carrier against the lever chain.
Davon ausgehend wird die vorgenannte Aufgabe der Erfindung dadurch gelöst, dass die bisher als Hebelkette ausgeführte Kraftübertragung vom Schalterantrieb zum Kontaktträger baulich völlig umgestaltet wird, insofern, dass sie als eine Art Knickglied aufgebaut wird.On this basis, the above object of the invention is achieved in that the previously executed as a lever chain power transmission from the switch drive to the contact carrier is structurally completely redesigned, insofar as it is constructed as a kind of articulated link.
Der erfindungsgemäße, strombegrenzende Leistungsschalter mit einem bewegbaren Schaltkontakt, mit einer Antriebsvorrichtung zur Überführung des Schaltkontaktes in eine Einschaltstellung und in eine Ausschaltstellung, einer im Zuge der Kraftübertragung von der Antriebsvorrichtung zum Schaltkontakt angeordneten Verklinkungseineinrichtung, die ausgehend von der Einschaltstellung des Schaltkontaktes durch eine vom Schaltkontakt ausgehende und in der Richtung der Ausschaltstellung wirkende Öffnungskraft lösbar ist, wenn die Öffnungskraft einen vorgegebenen Grenzwert überschreitet, wobei die Verklinkungseinrichtung als mechanisches Verbindungsglied zwischen der Antriebsvorrichtung und dem bewegbaren Schaltkontakt ausgebildet ist und wenigstens zwei zusammenwirkende, winklig zur Richtung der Öffnungskraft angeordnete Arbeitsflächen und eine auf die Arbeitsflächen wirkende Andruckfeder aufweist, besitzt folgende Merkmale:
- die Verklinkungseinrichtung weist zwei, mittels eines Gelenks miteinander verbundene und um das Gelenk relativ zueinander schwenkbare Hebel auf, wobei das Gelenk durch einen fluchtende Durchgangsbohrungen in konzentrischen Teilen der Hebel durchdringenden Gelenkbolzen gebildet ist, und die Hebel identisch ausgebildet sind,
- die Hebel weisen an ihren Berührungsflächen an den konzentrischen Teilen im Bereich des Gelenks als Verzahnung wirkende Schrägflächen auf, die konzentrisch um die Durchgangsbohrungen für den Gelenkbolzen angeordnet sind,
- die Hebel sind an den konzentrischen Teilen im Bereich des Gelenks durch eine Andruckfeder mit einer auf die durch die Schrägflächen gebildete Verzahnung an ihren Berührungsflächen wirkende Federkraft beaufschlagt,
- die Hebel stehen im Ruhezustand der Verklinkungseinrichtung zur Erzeugung eines von der Öffnungskraft abhängigen relativen Drehmomentes in einem von der Strecklage verschiedenen Winkel zueinander,
- die dem Gelenk abgewandten Enden der Hebel weisen mit Durchgangsbohrungen versehene Aufnahmen zur gelenkigen Verbindung mit dem Schaltkontakt bzw. mit der Antriebsvorrichtung auf.
- the latch means comprises two levers interconnected by a hinge and pivotable relative to each other about the hinge, the hinge being formed by an aligned through-holes in concentric parts of the lever-penetrating hinge pins, and the levers being identical;
- the levers have at their contact surfaces on the concentric parts in the region of the joint as a toothing acting oblique surfaces which are arranged concentrically around the through holes for the hinge pin,
- the levers are acted on the concentric parts in the region of the joint by a pressure spring with a force acting on the contact surfaces formed by the inclined surfaces spring force,
- the levers are in the resting state of Verklinkungseinrichtung for generating a dependent on the opening force relative torque in an angle different from the extended position,
- the ends of the levers facing away from the joint have receptacles provided with through holes for the articulated connection with the switching contact or with the drive device.
Der Gelenkbolzen weist zweckmäßig an seinem einen Ende einen Kopf als Widerlager für die Andruckfeder und an seinem anderen Ende ein Gewinde für eine Mutter auf. Die als Verzahnung dienenden, bei Belastung der Verklinkungseinrichtung in der Verdrehrichtung der Hebel aufeinander zu bewegten Schrägflächen sind mit steilen Flanken als Schnappflächen ausgebildet und die bei Belastung der Verklinkungseinrichtung in der Verdrehrichtung der Hebel voneinander weg bewegten Schrägflächen weisen flache Flanken als Gleitflächen auf.The hinge pin expediently has at one end a head as an abutment for the pressure spring and at its other end a thread for a nut. Serving as a toothing, when loading the Verklinkungseinrichtung in the direction of rotation of the lever toward each other to moving inclined surfaces are formed with steep flanks as snap surfaces and the loading of the Verklinkungseinrichtung in the direction of rotation of the lever away from each other moving inclined surfaces have flat flanks as sliding surfaces.
Die Andruckfeder ist vorteilhaft als den Gelenkbolzen umschließende und am Kopf des Gelenkbolzens abgestützte Schraubendruckfeder ausgebildet.The pressure spring is advantageously formed as the hinge pin enclosing and supported on the head of the hinge pin helical compression spring.
Die Achse des die Hebel verbindenden Gelenkes ist zweckmäßig parallel zu einer Schwenkachse des bewegbaren Schaltkontaktes angeordnet.The axis of the joint connecting the lever is expediently arranged parallel to a pivot axis of the movable switching contact.
Die von der Andruckfeder auf die Berührungsflächen der Hebel an den konzentrischen Teilen im Bereich des Gelenks mit den als Verzahnung wirkenden Schrägflächen ausgeübte Andruckkraft ist durch Veränderung der wirksamen Länge des Gelenkbolzens einstellbar.The force exerted by the pressure spring on the contact surfaces of the lever on the concentric parts in the region of the joint with the teeth acting as teeth inclined pressure is adjustable by changing the effective length of the hinge pin.
Diese Veränderung der wirksamen Länge des Gelenkbolzens wird in einfacher Weise dadurch bewirkt, dass die Mutter weiter aufgeschraubt oder weniger weit aufgeschraubt wird. Durch die erfindungsgemäße Verklinkungseinrichtung wird eine neue Baugruppe zur kraftübertragenden Verbindung des Schaltwellenhebels mit dem Schaltkontakt, beziehungsweise dem Kontaktträger geschaffen. Sie ist als kraftabhängig ausknickendes Element ausgebildet, welches es ermöglicht, dass beim Auftreten eines Kurzschlußstromes jede Schalteinheit, unabhängig voneinander und unabhängig von der EIN-Position der Schaltwelle, öffnet. Die beiden Hebel der Verklinkungseinrichtung sind identisch ausgebildet. Es ist also fertigungsmäßig nur ein Teil herzustellen. Die als Verzahnung der konzentrischen Teile der Hebel ausgebildeten Schrägflächen stehen unter dem Federdruck einer Andruckfeder, welcher so bemessen ist, dass eine definierte Kraft zum Einschalten und zur Bereitstellung der Kontaktkräfte ohne Ausknickung übertragen werden kann. Die Federkraft der Andruckfeder ist dabei stufenlos einstellbar, so dass die gewünschte Ausknick-Kraft der Verklinkungseinrichtung ebenfalls stufenlos eingestellt werden kann. Die erfindungsgemäße Verklinkungseinrichtung wird nicht, wie bei bekannten Ausführungen, teleskopartig zusammengeschoben, sondern es erfolgt eine Drehknickbewegung. Wenn im weiteren Verlauf des Abschaltvorganges der elektromagnetische Schnellauslöser den Schalter endgültig abschaltet, wird durch die sich drehende Schaltwelle und ihren Schaltwellenhebel die Verklinkungseinrichtung wieder in ihre Ruhestellung gebracht. Damit ist der Schalter wieder einschaltbereit.This change in the effective length of the hinge pin is effected in a simple manner by the fact that the mother continues screwed on or less screwed on. The latching device according to the invention provides a new assembly for the force-transmitting connection of the switching shaft lever with the switching contact or the contact carrier. It is designed as a force-dependent buckling element, which makes it possible that, when a short-circuit current occurs, each switching unit opens independently of one another and independently of the ON position of the switching shaft. The two levers of Verklinkungseinrichtung are identical. So it is only one part of production. Trained as teeth of the concentric parts of the lever inclined surfaces are under the spring pressure of a pressure spring, which is dimensioned so that a defined force can be transmitted to turn on and to provide the contact forces without buckling. The spring force of the pressure spring is infinitely adjustable, so that the desired Ausknick force of Verklinkungseinrichtung can also be adjusted continuously. The latching device according to the invention is not, as in known embodiments, telescoped together, but there is a rotary bending movement. If in the further course of the shutdown of the electromagnetic quick release switches off the switch finally, the Verklinkungseinrichtung is returned to its rest position by the rotating shaft and its switching shaft lever. The switch is ready to switch on again.
Die Erfindung soll nachfolgend zum besseren Verständnis anhand eines bevorzugten, den Schutzumfang nicht einschränkenden, Ausführungsbeispiels näher erläutert werden.The invention will be explained in more detail below for a better understanding with reference to a preferred, non-limiting scope, embodiment.
Die
Die
Die
Die
Die
Die
In den
In der
Die
Das die Hebel 14; 15 verbindende Gelenk 16 ist durch einen fluchtende Durchgangsbohrungen 21; 22 der Hebel 14; 15 durchsetzenden Gelenkbolzen 23 gebildet, welcher gleichzeitig die Führung und die Halterung für die als Schraubendruckfeder ausgebildete Andruckfeder 24 bildet, die den Gelenkbolzen 23 umschließt und am Ende des Gelenkbolzens 23 durch einen scheibenförmigen Kopf 25 desselben abgestützt ist. Auf der dem Kopf 25 gegenüberliegenden Seite des Gelenkbolzens 23 ist ein Gewinde 26 zur Aufnahme einer Mutter 27 vorgesehen, mittels welcher die Spannung der auf dem Gelenkbolzen 23 sitzenden Andruckfeder 24 veränderbar ist. Die beiden Hebel 14; 15 stehen somit unter dem veränderbaren Federdruck der Andruckfeder 24. An den dem Gelenk 16 gegenüberliegenden Seiten weisen die Hebel 14;15 mit je einer Durchgangsbohrung 28;29 versehene Aufnahmen 30; 31 auf, die zur Verbindung mit dem Schaltwellenhebel 12 beziehungsweise dem Kontaktträger 7 dienen.The
Die
Die
Die erfindungsgemäße Verklinkungseinrichtung 13 wirkt wie folgt:
- Überschreitet, beispielsweise im Falle eines Kurzschlusses, die durch die elektrodynamischen Stromkräfte und Stromengekräfte auf das Kontaktsystem ausgeübte Öffnungskraft einen vorherbestimmten Wert, der die Knick-Kraft so groß werden läßt, dass die an den aneinanderliegenden, als
Schnappflächen ausgebildeten Schrägflächen 17 auftretende Hubkraft die eingestellte Federkraft der Andruckfeder 24 überschreitet, gleiten diese Schrägflächen voneinander ab und schnappen über. Dadurchknickt die Verklinkungseinrichtung 13 ein und gibtden bewegbaren Schaltkontakt 8 frei.Sind die Schrägflächen 17 als Schnappflächen voneinander abgeglitten, setzen dieSchrägflächen 18 als in der Bewegungsrichtung abfallende Gleitflächen dem Einknicken der Verklinkungseinrichtung 13 keinen Widerstand mehr entgegen.
- Exceeds, for example, in the case of a short circuit, the force exerted by the electrodynamic current forces and current forces on the contact system opening force a predetermined value, which makes the buckling force so large that occurring at the adjacent, designed as snap surfaces inclined
surfaces 17 lifting force the set spring force exceeds thepressure spring 24, slide these inclined surfaces from each other and snap over. As a result, the latchingdevice 13 buckles and releases themovable switching contact 8. If theinclined surfaces 17 are slipped apart from each other as snap surfaces, theinclined surfaces 18, as sliding surfaces falling in the direction of movement, no longer oppose the buckling of the latchingdevice 13.
Der in dieser nicht stabilen Phase des Abschaltvorganges beim Öffnen des bewegbaren Schaltkontaktes 8 zwischen diesem und dem feststehenden Schaltkontakt 5 entstehende Abschaltlichtbogen begrenzt durch seinen Widerstand den fließenden Kurzschlußstrom, bevor im weiteren Verlauf des Abschaltvorganges der elektromagnetische Schnellauslöser anspricht und den Schalter endgültig abschaltet.The resulting in this unstable phase of the shutdown when opening the
Wenn im weiteren Verlauf des Abschaltvorganges der elektromagnetische Schnellauslöser den Schalter endgültig abschaltet, wird durch die sich drehende Schaltwelle 11 und ihren Schaltwellenhebel 12 die Verklinkungseinrichtung 13 wieder in ihre Ruhestellung gebracht. Damit ist der Schalter wieder einschaltbereit.If in the further course of the shutdown of the electromagnetic quick release switches off the switch finally, the latching
Die Federkraft der Andruckfeder 24 ist durch Veränderung der wirksamen Länge des Gelenkbolzens 23 durch mehr oder weniger weites Aufschrauben der Mutter 27 problemlos einstellbar und damit die Funktionskraft der Verklinkungseinrichtung 13 regulierbar.The spring force of the
Die erfindungsgemäße Anordnung ist mechanisch sehr einfach aufgebaut und hat trotzdem den Vorzug, dass die Funktionskraft problemlos regulierbar ist. Die beiden Hebel 14;15 sind identisch ausgebildet, es ist also fertigungsmäßig nur ein Teil herzustellen.The arrangement according to the invention is mechanically very simple and yet has the advantage that the functional force is easily adjustable. The two
- 11
- Niederspannungs-LeistungsschalterLow-voltage circuit breakers
- 22
- Rückwandrear wall
- 33
- Obere AnschlußschieneUpper connecting rail
- 44
- Untere AnschlußschieneLower connection rail
- 55
- Feststehender SchaltkontaktFixed switching contact
- 66
- Flexible VerbindungFlexible connection
- 77
- Kontaktträgercontact support
- 88th
- Bewegbarer SchaltkontaktMovable switching contact
- 99
- LichtbogenlöschkammerArc chute
- 1010
- Schalterantriebswitch drive
- 1111
- Schaltwelleshift shaft
- 1212
- SchaltwellenhebelShift shaft lever
- 1313
- Verklinkungseinrichtunglatching
- 1414
- Hebellever
- 1515
- Hebellever
- 1616
- Gelenkjoint
- 1717
- Schrägflächesloping surface
- 1818
- Schrägflächesloping surface
- 1919
- Konzentrisches TeilConcentric part
- 2020
- Konzentrisches TeilConcentric part
- 2121
- DurchgangsbohrungThrough Hole
- 2222
- DurchgangsbohrungThrough Hole
- 2323
- Gelenkbolzenhinge pins
- 2424
- Andruckfederpressure spring
- 2525
- Kopfhead
- 2626
- Gewindethread
- 2727
- Muttermother
- 2828
- DurchgangsbohrungThrough Hole
- 2929
- DurchgangsbohrungThrough Hole
- 3030
- Aufnahmeadmission
- 3131
- Aufnahmeadmission
Claims (7)
- Circuit breaker with current-limiting opening of a moving switching contact, having the following features:- a drive apparatus for moving the switching contact to a connected position and to a disconnected position,- a latching device which is arranged in the path of the force transmission from the drive apparatus to the switching contact,
which latching device, starting with the switching contact in the connected position, can be released by means of an opening force which originates from the switching contact and acts in the direction of the disconnected position, when the opening force exceeds a predetermined limit value,- with the latching device being in the form of a mechanical connecting element between the drive apparatus and the moving switching contact, and having at least two interacting working surfaces, which are arranged at an angle to the direction of the opening force, and a contact-pressure spring which acts on the working surfaces,
characterized by the following further features:- the latching device (13) has two levers (14; 15) which are connected to one another by means of a hinged joint (16) which is formed by a hinge bolt (23), which is passed through aligned through-holes (21; 22) in concentric parts (19; 20) of the levers (14; 15), which levers are designed to be identical and which can pivot relative to one another about the hinged joint (16),- the levers (14; 15) have inclined surfaces (17; 18) which act as a toothed system, on the concentric parts (19; 20) on their touching surfaces in the area of the hinged joint (16), which are arranged concentrically around the through-holes (21; 22) for the hinge bolt (23),- a spring force, which acts on the toothed system that is formed by the inclined surfaces (17; 18) on their touching surfaces acts on the concentric parts (19; 20) of the levers (14; 15), in the area of the hinged joint (16), by means of a contact-pressure spring (24),- when the latching device (13) is in the rest state, the levers (14; 15) are at an angle to one another, which is not the same as the angle when they are in the extended position, in order to produce a relative torque which is dependent on the opening force,- those ends of the levers (14; 15) which face away from the hinged joint (16) have holders (30; 31) which are provided with through-holes (28; 29) for hinged connection to the switching contact and, respectively, to the drive apparatus. - Circuit breaker according to Claim 1,
characterized
in that the hinge bolt (23) has a head (25) at one of its ends, as an opposing bearing for the contact-pressure spring, and at its other end has a thread (26) for a nut (27). - Circuit breaker according to Claim 1,
characterized
in that the inclined surfaces (17) which are used as a toothed system and move toward one another when the latching device (13) is loaded in the rotation direction of the levers (14; 15) are designed with steep flanks as snap-action surfaces. - Circuit breaker according to Claim 1,
characterized
in that the inclined surfaces (18) which are used as a toothed system and move away from one another when the latching device (13) is loaded in the rotation direction of the levers (14; 15) are designed with flat flanks as sliding surfaces. - Circuit breaker according to Claim 1,
characterized
in that the contact-pressure spring (24) is in the form of a helical compression spring, which surrounds the hinge bolt (23) and is supported on the head (25) of the hinge bolt. - Circuit breaker according to Claim 1 or 2,
characterized
in that the axis of the hinged joint (16) which connects the levers (14; 15) is arranged parallel to a pivoting axis of the moving switching contact. - Circuit breaker according to Claim 2, 3 or 4,
characterized
in that the contact-pressure force which is exerted by the contact-pressure spring (24) on the touching surfaces of the levers (14; 15) on the concentric parts (19; 20) in the area of the hinged joint (16) by means of the inclined surfaces (17; 18) which act as a toothed system can be adjusted by varying the effective length of the hinge bolt (23).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10054383 | 2000-10-27 | ||
DE10054383A DE10054383A1 (en) | 2000-10-27 | 2000-10-27 | Current-limiting low-voltage circuit breaker |
PCT/DE2001/002820 WO2002035570A1 (en) | 2000-10-27 | 2001-07-23 | Current limiting low-voltage power circuit breaker |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1328956A1 EP1328956A1 (en) | 2003-07-23 |
EP1328956B1 true EP1328956B1 (en) | 2008-12-31 |
Family
ID=7661955
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01964861A Expired - Lifetime EP1328956B1 (en) | 2000-10-27 | 2001-07-23 | Current limiting low-voltage power circuit breaker |
Country Status (7)
Country | Link |
---|---|
US (1) | US6819205B2 (en) |
EP (1) | EP1328956B1 (en) |
JP (1) | JP2004512647A (en) |
CN (1) | CN1242445C (en) |
DE (2) | DE10054383A1 (en) |
HK (1) | HK1062356A1 (en) |
WO (1) | WO2002035570A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10345660A1 (en) * | 2003-09-25 | 2005-05-12 | Siemens Ag | Drive train for at least one movable contact of an electrical switch and current-limiting electrical switch with a drive train |
DE102005028474B4 (en) * | 2005-06-20 | 2008-04-30 | Siemens Ag | Contact system has movable contact bridge swiveling about a jointed axis giving two contacts with only one used normally and both in the case of a current overload or short circuit |
DE102007011451A1 (en) | 2007-03-06 | 2008-09-11 | Siemens Ag | Contact lever movement device and electrical switch and method for producing the contact lever movement device |
US7566840B2 (en) * | 2007-10-04 | 2009-07-28 | General Electric Company | Contact arm mechanism for circuit breaker |
US7911302B2 (en) * | 2007-11-15 | 2011-03-22 | General Electric Company | Secondary trip system for circuit breaker |
DE102008047247A1 (en) * | 2008-09-10 | 2010-04-15 | Siemens Aktiengesellschaft | Contact system for power switching device, has locking device and contact element, which are arranged such that spring force is transferred from contact element for fixing or releasing contact element by locking device |
CN114496676B (en) * | 2020-10-26 | 2024-06-18 | 西门子能源国际公司 | Arcing contact assembly and circuit breaker |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE250749C (en) | ||||
FR721451A (en) | 1930-06-27 | 1932-03-03 | Merlin Gerin | Improvements to circuit breakers and particularly to fast acting circuit breakers for direct current |
DE1463312B2 (en) | 1963-05-16 | 1971-08-12 | Licentia Patent Verwaltungs GmbH, 6000 Frankfurt | SELF SWITCH WITH CURRENT-LIMITING OPENING OF THE CONTACT SYSTEM |
DE1513341A1 (en) * | 1965-12-29 | 1969-12-18 | Licentia Gmbh | Circuit breaker with current-limiting contact system |
CH486114A (en) | 1968-05-14 | 1970-02-15 | Siemens Ag | Low-voltage circuit breaker with a fixed section of conductor and a switching lever that forms a current loop with it |
DE2511948C3 (en) | 1975-03-19 | 1978-05-03 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Current limiting circuit breaker |
US4998081A (en) | 1989-05-18 | 1991-03-05 | Siemens Energy & Automation, Inc. | Power interrupter with force-sensitive contact latch |
US5566818A (en) | 1993-02-16 | 1996-10-22 | Fuji Electric Co., Ltd. | Movable contactor device in circuit breaker |
DE19630470C1 (en) * | 1996-07-27 | 1997-08-28 | Kloeckner Moeller Gmbh | Current-limiting circuit-breaker switch with two lugs on centrally pivoted lever |
DE19740422B4 (en) * | 1997-09-10 | 2005-10-06 | Siemens Ag | Current-limiting low-voltage circuit breaker |
US6218921B1 (en) * | 2000-02-24 | 2001-04-17 | Eaton Corporation | Adjustable flux transfer shunt trip actuator and electric power switch incorporating same |
US6376788B1 (en) * | 2001-01-08 | 2002-04-23 | Eaton Corporation | Magnetically collapsible toggle linkage for electrical switching apparatus |
-
2000
- 2000-10-27 DE DE10054383A patent/DE10054383A1/en not_active Withdrawn
-
2001
- 2001-07-23 CN CN01819408.7A patent/CN1242445C/en not_active Expired - Fee Related
- 2001-07-23 EP EP01964861A patent/EP1328956B1/en not_active Expired - Lifetime
- 2001-07-23 US US10/415,151 patent/US6819205B2/en not_active Expired - Fee Related
- 2001-07-23 DE DE50114625T patent/DE50114625D1/en not_active Expired - Fee Related
- 2001-07-23 JP JP2002538458A patent/JP2004512647A/en not_active Withdrawn
- 2001-07-23 WO PCT/DE2001/002820 patent/WO2002035570A1/en active Application Filing
-
2004
- 2004-07-20 HK HK04105302A patent/HK1062356A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE10054383A1 (en) | 2002-05-08 |
US20040056744A1 (en) | 2004-03-25 |
HK1062356A1 (en) | 2004-10-29 |
DE50114625D1 (en) | 2009-02-12 |
CN1242445C (en) | 2006-02-15 |
JP2004512647A (en) | 2004-04-22 |
US6819205B2 (en) | 2004-11-16 |
EP1328956A1 (en) | 2003-07-23 |
CN1476623A (en) | 2004-02-18 |
WO2002035570A1 (en) | 2002-05-02 |
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