EP0380012A1 - Contact system for a current limiting circuit breaker - Google Patents

Contact system for a current limiting circuit breaker Download PDF

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Publication number
EP0380012A1
EP0380012A1 EP90101176A EP90101176A EP0380012A1 EP 0380012 A1 EP0380012 A1 EP 0380012A1 EP 90101176 A EP90101176 A EP 90101176A EP 90101176 A EP90101176 A EP 90101176A EP 0380012 A1 EP0380012 A1 EP 0380012A1
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EP
European Patent Office
Prior art keywords
current path
switching arm
movable switching
contact system
arm
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
EP90101176A
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German (de)
French (fr)
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EP0380012B1 (en
Inventor
Hans Paluschka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eaton Industries GmbH
Original Assignee
Kloeckner Moeller Elektrizitaets GmbH
Kloeckner Moeller GmbH
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Publication of EP0380012A1 publication Critical patent/EP0380012A1/en
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Publication of EP0380012B1 publication Critical patent/EP0380012B1/en
Anticipated expiration legal-status Critical
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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

Definitions

  • the invention relates to a contact system for current-limiting circuit breakers according to the preamble of claim 1.
  • one switching arm is connected to the circuit breaker of the circuit breaker via a switching shaft and is used for operational switching. At the same time, this switching arm can also open dynamically when there is a current load in the short-circuit area before the switching takes place via the switching lock.
  • the second movable switching arm which can also be designed with two or more parallel switching arms, is pivotally mounted on the current path and is held in the switched-on position by one or more compression springs. It is connected to the current path with a strand and, in the event of a short circuit, pivots against the direction of movement of the first switching arm, so that the opening distance and also the opening speed increase when the switching contacts are lifted off due to an additional acceleration.
  • the arc between the contact pieces of the switching arms is additionally lengthened and extinguished more quickly, but the wire for the current supply, especially on the lower switching arm, forms a weak point in that the welding attachment of the wire on Switch arm is mechanically very heavily stressed by the sudden deflections in the event of a short circuit and can therefore easily lead to faults.
  • the invention has for its object to provide a contact system according to the preamble of claim 1, in which the second movable switching arm on the current path is designed and arranged so that the contact system in the closed state on the one hand has such a low contact contact resistance that on a flexible power supply in the form of a strand or the like between the pivotable switching arm and the current path can be dispensed with, and that, on the other hand, in the event of a short circuit, the arc is extended even more and is extinguished even more quickly.
  • a particularly advantageous pivot bearing of the movable switching arm results from the feature of claim 2 as well as from the features of claims 3 and 4, which contribute significantly to the free mobility of the switching arm in the event of a short circuit.
  • the current transfer from the current path to the movable switching arm can be further improved in that the switching arm has stop lugs which are offset in parallel with respect to the pivots towards the free end of the current path and which rest in the switched-on position of the switching arm on the top of the current path and the spring-loaded switching arm Secure it to the current path together with the pivot in its switch-on position.
  • a particularly good contact is achieved in that the stop lugs on the movable switching arm in relation to the parallel pivot to the free end of the current path are set back by a distance that only makes up part of the distance between the pivot pin and the front spring support, so that the switching arm in the switched-on position under the pressure of the helical compression spring with both the pivot pin and the two stop lugs in the manner of a two-armed rocker switch with one increased contact pressure is present on opposite sides of the current path.
  • the contact system 1 for current-limiting circuit breakers usually has two movable switching arms 2, 3 per phase, one of which 2 is connected in a known manner via a switching shaft 4 to the circuit breaker of the circuit breaker (not shown) and serves on the one hand for operational switching and on the other hand in the event of a current load in the Short-circuit area opens dynamically before switching via the key switch.
  • the second movable switching arm 3 is pivotally mounted in the switch housing 5 on the current path 6 and held by a compression spring 7 in the switched-on position in FIG. 1, that in the event of a short circuit it pivots against the direction of movement of the first switching arm 2, so that the opening distance and the Increase opening speed when lifting switch contacts 2a, 3a due to additional acceleration of the movable lower switching arm 3.
  • the second movable switching arm 3 is held with two pivot pins 8 directed coaxially to the side in open, approximately semi-cylindrical bearing recesses 9 in a pivotable, resilient contact on the underside 10 of the current path 6.
  • the current path 6 is fork-shaped in the region of the movable switching arm with a U-shaped central recess 11, the movable switching arm 3 engaging under the two fork legs 12, 13 of the current path 6 with its two pivot pins 8 directed to the side and by means of two parallel leaf springs 14, 15 the current path 6 is held in contact in the two bearing recesses 9 on the underside of the fork legs 12, 13.
  • the free ends 16, 17 of the fork legs 12, 13 of the current path 6 are in relation to a fastening plane 18 for the leaf springs 14, 15 on the underside of the current path 6 offset in parallel upwards that they then extend from the bottom 19 of the switch housing 5.
  • the bearing recesses 9 for the pivots 8 of the movable switching arm 3 are arranged in the region of the kink between the rising section 12a, 13a and the free ends 16, 17 of the fork legs 12, 13.
  • the two leaf springs 14, 15, which support the movable switching arm 3 on the two pivots 8, extend from the fastening plane 18 on the underside of the current path 6 along the fork legs 12, 13 and have bearing brackets 14a, 15a for the pivots at their free ends 8 of the movable switching arm 3, which lie opposite the bearing recesses 9 on the fork legs 12, 13.
  • the second movable switching arm 3 also has two parallel to the pivot 8 stop lugs 20 which are offset from the free end of the current path 6 in such a way that they rest in the switched-on position of the switching arm 3 of Fig. 1 on the top of the current path 6 and the spring-loaded Secure switch arm 3 together with the pivot pin 8 in its switched-on position on the current path 6.
  • the stop lugs 20 on the movable switching arm 3 are set back by a distance 21 from the parallel two pivots 8 to the free end of the current path 6, which is only part of the distance 22 between the pivots 8 and the front spring support 7 makes up, in the present case in an aspect ratio of the lever arms corresponding to the distances 21, 22 of about 1: 3, so that the switching arm 3 in the switched-on position of FIG. 1 under the action of the helical compression spring 7 with both the pivot pin 8 and with the two stop lugs 20 in the manner of a two-armed rocker switch with an increased contact pressure on opposite sides of the current path 6.
  • the stop lugs 20 can have a wedge-shaped tapered or rounded cross-section towards the current path 6, so that they rest with their lower longitudinal sides on the upper side of the fork legs 12, 13 of the current path 6 in the form of a line or strip, and thus flawless contact points for the current transfer from the movable Form switching arm 3 on the current path 6.
  • a stop 23 fixed to the housing is provided on the switch housing 5 below the pivots 8 of the movable switching arm 3.
  • the movable switching arm 3 has a stop cap 20 and a part of the switching arm 3 to its contact piece 3a covering insulating cap 24 (Fig. 4 to 8) made of plastic, which prevents the arc occurring in the event of a short circuit running along the movable lower switching arm 3 .
  • the arc 25 can be supplied particularly favorably to the two switching arms 2, 3 opposite quenching plates, not shown in the drawing, if on the current path 6, as can be seen in FIGS. 1 to 3 in detail, following the U-shaped one Central recess 11 in the extension of the lower movable switching arm 3 at least one arc guide rib 26 is provided, which the movable switching arm 3 can touch in the event of a short circuit, so that the arc 25 jumps over and is additionally lengthened.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

In known contact systems for current-limiting circuit breakers, with two moving switching arms in each case per phase, the lower switching arm is connected to the current path by means of a braided cable and, in the event of a short-circuit, pivots against the movement direction of the upper switching arm, which is coupled to the latching mechanism. As a result of the dynamic deflection of the two switching arms in the event of a short-circuit, the arc between the contact pieces is admittedly additionally extended and extinguished more quickly, but the braided cable for the current supply just forms a weak point on the lower switching arm to the extent that the welded attachment of the braided cable to the switching arm is mechanically very highly loaded by the impact-like deflection in the event of a short-circuit. The braided cable can be dispensed with in that the second moving switching arm (3) is held by means of journals (8), directed coaxially to the side, in open, approximately half- cylindrical bearing recesses (9) in pivotably sprung contact on the underside (10) of the current path (6). The moving switching arm (3) additionally has stop tabs (20), which are offset in a parallel manner with respect to the free end of the current path (6), opposite the journals (8), which stop tabs (20) rest on the upper side of the current path (6) when the switching arm (3) is in the switched-on position and secure the spring-loaded switching arm (3) together with the journals (8) on the current path (6) in its switched-on position. <IMAGE>

Description

Die Erfindung betrifft ein Kontaktsystem für strombe­grenzende Leistungsschalter nach dem Oberbegriff des Anspruchs 1.The invention relates to a contact system for current-limiting circuit breakers according to the preamble of claim 1.

Bei derartigen Kontaktsytemen für Leistungsschalter mit zwei beweglichen Schaltarmen ist der eine Schaltarm über eine Schaltwelle mit dem Schaltschloß des Leistungsschalters ver­bunden und dient dem betriebsmäßigen Schalten. Gleichzeitig kann dieser Schaltarm bei Strombelastung im Kurzschlußbe­reich auch dynamisch öffnen, bevor die Schaltung über das Schaltschloß erfolgt.In contact systems of this type for circuit breakers with two movable switching arms, one switching arm is connected to the circuit breaker of the circuit breaker via a switching shaft and is used for operational switching. At the same time, this switching arm can also open dynamically when there is a current load in the short-circuit area before the switching takes place via the switching lock.

Der zweite bewegliche Schaltarm, der auch mit zwei oder mehr parallelen Schaltarmen ausgebildet sein kann, ist an der Strombahn schwenkbar gelagert und durch eine oder mehrere Druckfedern in der Einschaltstellung gehalten. Er ist mit der Strombahn mit einer Litze verbunden und schwenkt im Kurzschlußfalle entgegen der Bewegungsrichtung des ersten Schaltarmes, so daß sich die Öffnungsstrecke und auch die Öffnungsgeschwindigkeit beim Abheben der Schaltkontakte aufgrund einer zusätzlichen Beschleunigung vergrößern. Da­durch wird der Lichtbogen zwischen den Kontaktstücken der Schaltarme zwar zusätzlich gelängt und schneller zum Er­löschen gebracht, jedoch bildet die Litze für die Strom­führung gerade an dem unteren Schaltarm insofern eine Schwachstelle, als die Schweißbefetigung der Litze am Schaltarm durch die schlagartigen Auslenkungen im Kurz­schlußfalle mechanisch sehr stark beansprucht wird und daher leicht zu Störungen führen kann.The second movable switching arm, which can also be designed with two or more parallel switching arms, is pivotally mounted on the current path and is held in the switched-on position by one or more compression springs. It is connected to the current path with a strand and, in the event of a short circuit, pivots against the direction of movement of the first switching arm, so that the opening distance and also the opening speed increase when the switching contacts are lifted off due to an additional acceleration. As a result, the arc between the contact pieces of the switching arms is additionally lengthened and extinguished more quickly, but the wire for the current supply, especially on the lower switching arm, forms a weak point in that the welding attachment of the wire on Switch arm is mechanically very heavily stressed by the sudden deflections in the event of a short circuit and can therefore easily lead to faults.

Der Erfindung liegt die Aufgabe zugrunde, ein Kontaktsytem nach dem Oberbegriff des Anspruches 1 zu schaffen, bei dem der zweite bewegliche Schaltarm an der Strombahn so ausge­bildet und angeordnet ist, daß das Kontaktsystem im ge­schlossenen Zustand einerseits einen derart geringen Kon­takt-Übergangswiderstand aufweist, daß auf eine flexible Stromführung in Form einer Litze oder dergleichen zwischen dem schwenkbaren Schaltarm und der Strombahn verzichtet werden kann, und daß andererseits im Kurzschlußfalle der Lichtbogen noch stärker aufgelängt und noch schneller zum Erlöschen gebracht wird.The invention has for its object to provide a contact system according to the preamble of claim 1, in which the second movable switching arm on the current path is designed and arranged so that the contact system in the closed state on the one hand has such a low contact contact resistance that on a flexible power supply in the form of a strand or the like between the pivotable switching arm and the current path can be dispensed with, and that, on the other hand, in the event of a short circuit, the arc is extended even more and is extinguished even more quickly.

Diese Aufgabe wird gemäß der Erfindung durch den Kennzeich­nungsteil des Anspruchs 1 gelöst, während in den Ansprüchen 2 bis 11 besonders vorteilhafte Weiterbildungen der Erfin­dung gekennzeichnet sind.This object is achieved according to the invention by the characterizing part of claim 1, while particularly advantageous developments of the invention are characterized in claims 2 to 11.

Dadurch, daß der zweite bewegliche Schaltarm mit koaxial zur Seite gerichteten Drehzapfen in offnen, etwa halbzylin­drischen Lageraussparungn in schwenkbarer federnder Anlage an der Unterseite der Strombahn gehalten ist, ergibt sich einerseits durch die stabile Halterung des Schaltarmes im geschlossenen Normalzustand des Kontaktsystemes ein einwand­freier Stromübergang von den Lagerstellen an der Strombahn auf die Drehzapfen des Schaltarmes und weiter durch eine flächige Berührung zwischen den Kontaktteilen zu dem anderen beweglichen Schaltarm, der mit dem Schaltschloß verbunden ist, während bei der dynamischen Auslösung im Kurzschluß­falle durch die federnde Abstützung des beweglichen Kontakt­armes an der Strombahn bei gutem Kontaktdruck eine leicht­gängige und rasche Verschwenkung des beweglichen Schaltarmes gegenüber der Strombahn gewährleistet ist, was nicht nur zu einer zusätzlichen Längung des Lichtbogens im Kurzschluß­falle, sondern auch zu einer forcierten Löschung des Licht­bogens im Kurzschlußfalle führt.The fact that the second movable switching arm with coaxial pivots is held in open, approximately semi-cylindrical bearing recesses in pivotable resilient contact on the underside of the current path, results on the one hand by the stable mounting of the switching arm in the closed normal state of the contact system, a perfect current transfer from the Bearing points on the current path on the pivot pin of the switching arm and further by a flat contact between the contact parts to the other movable switching arm, which is connected to the switching lock, while in dynamic tripping in the event of a short circuit by the resilient support of the movable contact arm on the current path in good Contact pressure ensures a smooth and rapid pivoting of the movable switching arm in relation to the current path, which is not only too an additional elongation of the arc in the event of a short circuit, but also leads to a forced extinguishing of the arc in the event of a short circuit.

Eine besonders vorteilhafte Schwenklagerung des beweglichen Schaltarmes ergibt sich durch das Merkmal des Anspruchs 2 ebenso wie durch die Merkmale der Ansprüche 3 und 4, die zur freien Beweglichkeit des Schaltarmes im Kurzschlußfalle maß­geblich beitragen.A particularly advantageous pivot bearing of the movable switching arm results from the feature of claim 2 as well as from the features of claims 3 and 4, which contribute significantly to the free mobility of the switching arm in the event of a short circuit.

Durch das Merkmal des Anspruchs 5 ist außerdem sowohl im ge­schlossenen Normalzustand als auch beim Auslösen im Kurz­schlußfalle stets ein einwandfreier Stromübergang zwischen der Strombahn und dem beweglichen Schaltarm gewährleistet, und zwar entweder unmittelbar zwischen den Drehlageraus­sparungen für die Drehzapfen des Schaltarmes an der Unter­seite der Gabelschenkel oder aber beim Auslösen im Kurz­schlußfalle über die beiden Blattfedern, die sich von einer Befestigungsstelle an der Unterseite der Strombahn an den Gabelschenkeln erstrecken und die Drehzapfen des beweglichen Schaltarmes mit Lagerbügeln an ihren freien Enden unter­greifen, die den Lageraussparungen an den Gabelschenkeln gegenüberliegen.Due to the feature of claim 5, a perfect current transfer between the current path and the movable switching arm is always guaranteed both in the closed normal state and when triggered in the event of a short circuit, either directly between the pivot bearing recesses for the pivot of the switching arm on the underside of the fork legs or else when triggered in the event of a short circuit via the two leaf springs, which extend from a fastening point on the underside of the current path on the fork legs and engage under the pivots of the movable switching arm with bearing brackets at their free ends, which are opposite the bearing recesses on the fork legs.

Der Stromübergang von der Strombahn zu dem beweglichen Schaltarm kann dabei noch dadurch weiter verbessert werden, daß der Schaltarm gegenüber den Drehzapfen zum freien Ende der Strombahn hin parallel versetzte Anschlagnasen aufweist, die in der Einschaltstellung des Schaltarmes an der Ober­seite der Strombahn anliegen und den federbelasteten Schalt­arm zusammen mit den Drehzapfen in seiner Einschaltstellung an der Strombahn sichern.The current transfer from the current path to the movable switching arm can be further improved in that the switching arm has stop lugs which are offset in parallel with respect to the pivots towards the free end of the current path and which rest in the switched-on position of the switching arm on the top of the current path and the spring-loaded switching arm Secure it to the current path together with the pivot in its switch-on position.

Eine besonders gute Kontaktgabe wird dabei dadurch erreicht, daß die Anschlagnasen am beweglichen Schaltarm gegenüber den dazu parallelen Drehzapfen zum freien Ende der Strombahn hin um einen Abstand zurückversetzt sind, der lediglich einen Teil des Abstandes zwischen den Drehzapfen und der vorderen Federabstützung ausmacht, so daß der Schaltarm in der Ein­schaltstellung unter dem Druck der Schraubendruckfeder sowohl mit den Drehzapfen als auch mit den beiden Anschlag­nasen nach Art einer zweiarmigen Schaltwippe mit einem er­höhten Kontaktdruck an gegenüberliegenden Seiten der Strom­bahn anliegt.A particularly good contact is achieved in that the stop lugs on the movable switching arm in relation to the parallel pivot to the free end of the current path are set back by a distance that only makes up part of the distance between the pivot pin and the front spring support, so that the switching arm in the switched-on position under the pressure of the helical compression spring with both the pivot pin and the two stop lugs in the manner of a two-armed rocker switch with one increased contact pressure is present on opposite sides of the current path.

Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in der Zeichnung schematisch dargestellt. Es zeigen:

  • Fig. 1 ein Kontaktsystem im geschlossenen Normalzustand,
  • Fig. 2 das Kontaktsystem beim Auslösen im Kurzschlußfalle in voll ausgezogenen Linien, während die endgül­tige Stellung der Schaltarme nach dem Kurzschluß nur gestrichelt angedeutet ist,
  • Fig. 3 eine perspektivische Ansicht einer Strombahn des Kontaktsystems mit einem daran schwenkbar ge­lagerten Schaltarm,
  • Fig. 4 eine Seitenansicht des Schaltarmes der Strombahn von Fig. 3
  • Fig. 5 eine Draufsicht auf den Schaltarm von Fig. 4,
  • Fig. 6 eine Stirnansicht des Schaltarmes in Richtung des Pfeiles VI von Fig. 4,
  • Fig. 7 eine Ansicht einer Isolierabdeckung an dem Schalt­arm der Strombahn und
  • Fig. 8 eine Schnittdarstellung der Isolierabdeckung gemäß Schnittlinie VIII - VIII von Fig. 7
A preferred embodiment of the invention is shown schematically in the drawing. Show it:
  • 1 shows a contact system in the closed normal state,
  • 2 the contact system when triggered in the event of a short circuit in solid lines, while the final position of the switching arms after the short circuit is only indicated by dashed lines,
  • 3 is a perspective view of a current path of the contact system with a switching arm pivotally mounted thereon,
  • 4 shows a side view of the switching arm of the current path from FIG. 3
  • 5 is a plan view of the shift arm of FIG. 4,
  • 6 is an end view of the switching arm in the direction of arrow VI of FIG. 4,
  • Fig. 7 is a view of an insulating cover on the switching arm of the current path and
  • 8 is a sectional view of the insulating cover along section line VIII - VIII of FIG. 7

Das Kontaktsystem 1 für strombegrenzende Leistungsschalter hat üblicherweise je zwei bewegliche Schaltarme 2, 3 pro Phase, von denen der eine 2 über eine Schaltwelle 4 mit dem nicht gezeigten Schaltschloß des Leistungsschalters in be­kannter Weise verbunden ist und einerseits dem betriebs­mäßigen Schalten dient und andererseits bei Strombelastung im Kurzschlußbereich dynamisch öffnet, bevor die Schaltung über das Schaltschloß erfolgt.The contact system 1 for current-limiting circuit breakers usually has two movable switching arms 2, 3 per phase, one of which 2 is connected in a known manner via a switching shaft 4 to the circuit breaker of the circuit breaker (not shown) and serves on the one hand for operational switching and on the other hand in the event of a current load in the Short-circuit area opens dynamically before switching via the key switch.

Der zweite bewegliche Schaltarm 3 ist im Schaltergehäuse 5 an der Strombahn 6 derart schwenkbar gelagert und durch eine Druckfeder 7 in der Einschaltstellung von Fig. 1 gehalten, daß er im Kurzschlußfalle entgegen der Bewegungsrichtung des Ersten Schaltarmes 2 schwenkt, so daß sich die Öffnungs­strecke und die Öffnungsgeschwindigkeit beim Abheben der Schaltkontakte 2a, 3a aufgrund zusätzlicher Beschleunigung des beweglichen unteren Schaltarmes 3 vergrößern.The second movable switching arm 3 is pivotally mounted in the switch housing 5 on the current path 6 and held by a compression spring 7 in the switched-on position in FIG. 1, that in the event of a short circuit it pivots against the direction of movement of the first switching arm 2, so that the opening distance and the Increase opening speed when lifting switch contacts 2a, 3a due to additional acceleration of the movable lower switching arm 3.

Wie insbesondere in Fig. 1 bis 3 zu erkennen ist, ist der zweite bewegliche Schaltarm 3 mit zwei koaxial zur Seite gerichteten Drehzapfen 8 in offenen, etwa halbzylindrischen Lageraussparungen 9 in schwenkbarer federnder Anlage an der Unterseite 10 der Strombahn 6 gehalten.As can be seen in particular in FIGS. 1 to 3, the second movable switching arm 3 is held with two pivot pins 8 directed coaxially to the side in open, approximately semi-cylindrical bearing recesses 9 in a pivotable, resilient contact on the underside 10 of the current path 6.

Die Strombahn 6 ist im Bereich des beweglichen Schaltarmes mit einer U-förmigen Mittelaussparung 11 gabelförmig aus­gebildet, wobei der bewegliche Schaltarm 3 die beiden Gabel­schenkel 12, 13 der Strombahn 6 mit seinen beiden zur Seite gerichteten Drehzapfen 8 untergreift und durch zwei paral­lele Blattfedern 14, 15 in den beiden Lageraussparungen 9 an der Unterseite der Gabelschenkel 12, 13 der Strombahn 6 in Anlage gehalten ist.The current path 6 is fork-shaped in the region of the movable switching arm with a U-shaped central recess 11, the movable switching arm 3 engaging under the two fork legs 12, 13 of the current path 6 with its two pivot pins 8 directed to the side and by means of two parallel leaf springs 14, 15 the current path 6 is held in contact in the two bearing recesses 9 on the underside of the fork legs 12, 13.

Die freien Enden 16, 17 der Gabelschenkel 12, 13 der Strom­bahn 6 sind gegenüber einer Befestigungsebene 18 für die Blattfedern 14,15 an der Unterseite der Strombahn 6 derart parallel nach oben versetzt, daß sie sich im Anschluß vom Boden 19 des Schaltergehäuses 5 erstrecken.The free ends 16, 17 of the fork legs 12, 13 of the current path 6 are in relation to a fastening plane 18 for the leaf springs 14, 15 on the underside of the current path 6 offset in parallel upwards that they then extend from the bottom 19 of the switch housing 5.

Die Lageraussparungen 9 für die Drehzapfen 8 des beweglichen Schaltarmes 3 sind im Bereich der Knickstelle zwischen dem ansteigenden Abschnitt 12a, 13a und den freien Enden 16, 17 der Gabelschenkel 12, 13 angeordnet.The bearing recesses 9 for the pivots 8 of the movable switching arm 3 are arranged in the region of the kink between the rising section 12a, 13a and the free ends 16, 17 of the fork legs 12, 13.

Die beiden Blattfedern 14,15 die den beweglichen Schaltarm 3 an den beiden Drehzapfen 8 unterstützen, erstrecken sich von der Befestigungsebene 18 an der Unterseite der Strombahn 6 an den Gabelschenkeln 12, 13 entlang und weisen an ihren freien Enden Lagerbügel 14a, 15a für die Drehzapfen 8 des beweglichen Schaltarmes 3 auf, die den Lageraussparungen 9 an den Gabelschenkeln 12, 13 gegenüberliegen.The two leaf springs 14, 15, which support the movable switching arm 3 on the two pivots 8, extend from the fastening plane 18 on the underside of the current path 6 along the fork legs 12, 13 and have bearing brackets 14a, 15a for the pivots at their free ends 8 of the movable switching arm 3, which lie opposite the bearing recesses 9 on the fork legs 12, 13.

Der zweite bewegliche Schaltarm 3 besitzt außerdem zwei zu den Drehzapfen 8 parallele Anschlagnasen 20, die zum freien Ende der Strombahn 6 hin derart versetzt sind, daß sie in der Einschaltstellung des Schaltarmes 3 von Fig. 1 an der Oberseite der Strombahn 6 anliegen und den federbelasteten Schaltarm 3 zusammen mit den Drehzapfen 8 in seiner Ein­schaltstellung an der Strombahn 6 sichern.The second movable switching arm 3 also has two parallel to the pivot 8 stop lugs 20 which are offset from the free end of the current path 6 in such a way that they rest in the switched-on position of the switching arm 3 of Fig. 1 on the top of the current path 6 and the spring-loaded Secure switch arm 3 together with the pivot pin 8 in its switched-on position on the current path 6.

Um einen erhöhten Kontaktdruck zu erzeugen, sind die An­schlagnasen 20 am beweglichen Schaltarm 3 gegenüber den dazu parallelen beiden Drehzapfen 8 zum freien Ende der Strombahn 6 hin um einen Abstand 21 zurückversetzt, der lediglich einen Teil des Abstandes 22 zwischen den Drehzapfen 8 und der vorderen Federabstützung 7 ausmacht, und zwar im vor­liegenden Fall in einem Längenverhältnis der den Abständen 21, 22 entsprechenden Hebelarme von etwa 1 : 3, so daß der Schaltarm 3 in der Einschaltstellung von Fig. 1 unter der Wirkung der Schraubendruckfeder 7 sowohl mit den Drehzapfen 8 als auch mit den beiden Anschlagnasen 20 nach Art einer zweiarmigen Schaltwippe mit einem erhöhten Kontaktdruck an gegenüberliegenden Seiten der Strombahn 6 anliegt.In order to generate an increased contact pressure, the stop lugs 20 on the movable switching arm 3 are set back by a distance 21 from the parallel two pivots 8 to the free end of the current path 6, which is only part of the distance 22 between the pivots 8 and the front spring support 7 makes up, in the present case in an aspect ratio of the lever arms corresponding to the distances 21, 22 of about 1: 3, so that the switching arm 3 in the switched-on position of FIG. 1 under the action of the helical compression spring 7 with both the pivot pin 8 and with the two stop lugs 20 in the manner of a two-armed rocker switch with an increased contact pressure on opposite sides of the current path 6.

Die Anschlagnasen 20 können dabei einen zur Strombahn 6 hin keilförmig verjüngten oder abgerundeten Querschnitt haben, so daß sie mit ihren unteren Längsseiten an der Oberseite der Gabelschenkel 12, 13 der Strombahn 6 linien- oder streifenförmig anliegen und so einwandfreie Kontaktstellen für den Stromübergang von dem beweglichen Schaltarm 3 auf die Strombahn 6 bilden.The stop lugs 20 can have a wedge-shaped tapered or rounded cross-section towards the current path 6, so that they rest with their lower longitudinal sides on the upper side of the fork legs 12, 13 of the current path 6 in the form of a line or strip, and thus flawless contact points for the current transfer from the movable Form switching arm 3 on the current path 6.

Um das Abheben des beweglichen Schaltarmes 3 von der Unter­seite der Strombahn 6 im Kurzschlußfalle zu begrenzen, ist am Schaltergehäuse 5 unterhalb der Drehzapfen 8 des be­weglichen Schaltarmes 3 ein gehäusefester Anschlag 23 vor­handen.In order to limit the lifting of the movable switching arm 3 from the underside of the current path 6 in the event of a short circuit, a stop 23 fixed to the housing is provided on the switch housing 5 below the pivots 8 of the movable switching arm 3.

Außerdem besitzt der bewegliche Schaltarm 3 eine die An­schlagnasen 20 und einen Teil des Schaltarmes 3 bis an dessen Kontaktstück 3a überdeckende Isolierkappe 24 (Fig. 4 bis 8) aus Kunststoff, die verhindert, daß der im Kurz­schlußfalle entstehende Lichtbogen an dem beweglichen unteren Schaltarm 3 entlangläuft.In addition, the movable switching arm 3 has a stop cap 20 and a part of the switching arm 3 to its contact piece 3a covering insulating cap 24 (Fig. 4 to 8) made of plastic, which prevents the arc occurring in the event of a short circuit running along the movable lower switching arm 3 .

Ferner kann der Lichtbogen 25 besonders günstig den beiden Schaltarmen 2, 3 gegenüberliegenden, in der Zeichnung nicht gezeigten Löschblechen zugeführt werden, wenn an der Strom­bahn 6, wie in Fig. 1 bis 3 im einzelnen zu erkennen ist, im Anschluß an die U-förmige Mittelaussparung 11 in Verlänge­rung des unteren beweglichen Schaltarmes 3 mindestens eine Lichtbogenführungsrippe 26 vorgesehen ist, die der beweg­liche Schaltarm 3 im Kurzschlußfall berühren kann, so daß der Lichtbogen 25 überspringt und zusätzlich verlängert wird.Furthermore, the arc 25 can be supplied particularly favorably to the two switching arms 2, 3 opposite quenching plates, not shown in the drawing, if on the current path 6, as can be seen in FIGS. 1 to 3 in detail, following the U-shaped one Central recess 11 in the extension of the lower movable switching arm 3 at least one arc guide rib 26 is provided, which the movable switching arm 3 can touch in the event of a short circuit, so that the arc 25 jumps over and is additionally lengthened.

Claims (11)

1. Kontaktsystem für strombegrenzende Leistungsschalter mit je zwei beweglichen Schaltarmen pro Phase, von denen der eine über eine Schaltwelle mit dem Schalt­schloß des Leistungsschalters verbunden ist und einer­seits dem betriebsmäßigen Schalten dient und anderer­seits bei Strombelastung im Kurzsclußbereich dynamisch öffnet, bevor die Schaltung über das Schaltschloß er­folgt, während der zweite bewegliche Schaltarm an der Strombahn derart schwenkbar gelagert und durch eine Druckfeder in der Einschaltstellung gehalten ist, daß er im Kurzschlußfalle entgegen der Bewegungsrichtung des ersten Schaltarmes schwenkt, so daß sich die Öff­nungsstrecke und die Öffnungsgeschwindigkeit beim Ab­heben der Schaltkontakte aufgrund zusätzlicher Be­schleunigung vergrößern, dadurch gekennzeichnet, daß der zweite bewegliche Schaltarm (3) mit koaxial zur Seite gerichteten Drehzapfen (8) in offnen, etwa halb­zylindrischen Lageraussparungen (9) in schwenkbarer federnder Anlage an der Unterseite (10) der Strombahn (6) gehalten ist.1.Contact system for current-limiting circuit breakers, each with two movable switching arms per phase, one of which is connected via a switching shaft to the circuit breaker of the circuit breaker and on the one hand is used for operational switching and on the other hand opens dynamically when there is a current load in the short-circuit range before the switching takes place via the switching circuit , while the second movable switching arm is pivotally mounted on the current path and is held in the switch-on position by a compression spring that, in the event of a short circuit, it pivots against the direction of movement of the first switching arm, so that the opening distance and the opening speed increase when the switching contacts are lifted off due to additional acceleration , characterized in that the second movable switching arm (3) with coaxial pivots (8) in open, approximately semi-cylindrical bearing recesses (9) in a pivotable, resilient contact on the underside (10) the current path (6) is held. 2. Kontaktsystem nach Anspruch 1, dadurch gekennzeichnet, daß die Strombahn (6) im Bereich des beweglichen Schaltarmes(3) derart gabelförmig ausgebildet ist, daß der bewegliche Schaltarm (3) die beiden Gabelschenkel (12, 13) der Strombahn (6) mit seinen zur Seite ge­richteten Drehzapfen (8) untergreift und durch zwei parallele Blattfedern (14, 15) in den beiden Lager­aussparungen (9) an der Unterseite (10) der Gabel­schenkel (12, 13) der Strombahn (6) in Anlage gehalten ist.2. Contact system according to claim 1, characterized in that the current path (6) in the region of the movable switching arm (3) is fork-shaped such that the movable switching arm (3) the two fork legs (12, 13) engages under the current path (6) with its pivot pins (8) directed to the side and through two parallel leaf springs (14, 15) in the two bearing recesses (9) on the underside (10) of the fork legs (12, 13) the current path (6) is kept in contact. 3. Kontaktsystem nach Anspruch 1 und 2, dadurch gekenn­zeichnet, daß die freien Enden 816, 17) der Gabel­schenkel (12, 13) der Strombahn (6) gegenüber einer Befestigungsebene (18) für die Blattfedern (14, 15) an der Unterseite der Strombahn (6) höhenmäßig derart parallel versetzt sind, daß sie sich im Anschluß an einen schräg ansteigenden Abschnitt (12a, 13a) im Ab­stand vom Boden (19) des Schaltergehäuses (5) erstrek­ken.3. Contact system according to claim 1 and 2, characterized in that the free ends 816, 17) of the fork legs (12, 13) of the current path (6) relative to a mounting plane (18) for the leaf springs (14, 15) on the underside of the The height of the current path (6) is offset in parallel in such a way that they extend at a distance from the bottom (19) of the switch housing (5) following a sloping section (12a, 13a). 4. Kontaktsystem nach Anspruch 1 bis 3, dadurch gekenn­zeichnet, daß sich die beiden Blattfedern (14, 15) von der Befestigungsebene (18) an der Unterseite der Strom­bahn (6) an den Gabelschenkeln (12, 13) entlang er­strecken und an ihren freien Enden Lagerbügel (14a,15a) für die Drehzapfen (8) des beweglichen Schaltarmes (3) aufweisen, die den Lageraussparungen (9) an den Gabel­schenkeln (12, 13) gegenüberliegen.4. Contact system according to claim 1 to 3, characterized in that the two leaf springs (14, 15) from the mounting level (18) on the underside of the current path (6) along the fork legs (12, 13) and at their free End of the bearing bracket (14a, 15a) for the pivot pins (8) of the movable switching arm (3), which are opposite the bearing recesses (9) on the fork legs (12, 13). 5. Kontaktsystem nach den Ansprüchen 1 bis 4, dadurch ge­kennzeichnet, daß sich die beiden Blattfedern (14, 15) von der Befestigungsebene (18) an der Unterseite der Strombahn (6) an den Gabelschenkeln (12, 13) entlang erstrecken und an ihren freien Enden Lagerbügel (14a, 15a) für die Drehzazapfen (8) des beweglichen Schalt­armes (3) aufweisen, die den Lageraussparungen (9) an den Gabelschenkeln (12, 13) gegenüberliegen.5. Contact system according to claims 1 to 4, characterized in that the two leaf springs (14, 15) from the mounting level (18) on the underside of the current path (6) along the fork legs (12, 13) and on their Free ends of the bearing bracket (14a, 15a) for the trunnions (8) of the movable switching arm (3), which are opposite the bearing recesses (9) on the fork legs (12, 13). 6. Kontaktsystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der zweite bewegliche Schaltarm (3) gegenüber den Drehzapfen (8) zum freien Ende der Strom­bahn (6) hin parallel versetzte Anschlagnasen (20) auf­weist, die in der Einschaltstellung des Schaltarmes (3) an der Oberseite der Strombahn (6) anliegen und den federbelasteten Schaltarm (3) zusammen mit den Dreh­zapfen (8) in seiner Einschaltstellung an der Strombahn (6) sichern.6. Contact system according to one of claims 1 to 5, characterized in that the second movable switching arm (3) relative to the pivot pin (8) towards the free end of the current path (6) has staggered stop lugs (20) which in the switched-on position Switch arm (3) on top of the current path (6) and secure the spring-loaded switching arm (3) together with the pivot pin (8) in its switch-on position on the current path (6). 7. Kontaktsystem nach Anspruch 6, dadurch gekennzeichnet, daß die Anschlagnasen (20) am beweglichen Schaltarm (3) gegenüber den dazu parallelen beiden Drehzapfen (8) zum freien Ende der Strombahn 86) hin um einen Abstand (21) zurückversetzt sind, der lediglich einen Teil des Ab­standes (22) zwischen den Drehzapfen (8) und der vor­deren Federabstützung (7) ausmacht, so daß der Schalt­arm (3) in der Einschaltstellung unter dem Druck der Schraubendruckfeder 87) sowohl mit den Drehzapfen (8) als auch mit den beiden Anschlagnasen (20) nach Art einer zweiarmigen Schaltwippe mit einem erhöhten Kon­taktdruck an gegenüberliegenden Seiten der Strombahn (6) anliegt.7. Contact system according to claim 6, characterized in that the stop lugs (20) on the movable switching arm (3) relative to the parallel two pivots (8) to the free end of the current path 86) are set back by a distance (21) which is only part of the distance (22) between the pivot pin (8) and the front spring support (7), so that the switching arm (3) in the switched-on position under the pressure of the helical compression spring 87) with both the pivot pin (8) and with the two stop lugs (20) in the manner of a two-armed rocker switch with an increased contact pressure on opposite sides of the current path (6). 8. Kontaktsystem nach Anspruch 6 und 7, dadurch gekenn­zeichnet, daß die Anschlagnasen (20) an dem beweglichen Schaltarm (3) einen zur Strombahn (6) hin keilförmig verjüngten oder abgerundeten Querschnitt haben und mit ihren unteren Längsseiten an der Oberseite der Gabel­schenkel (12, 13) der Strombahn (6) linien- oder streifenförmige Kontaktstellen für den Stromübergang von dem beweglichen Schaltarm (3) auf die Strombahn (6) bilden.8. Contact system according to claim 6 and 7, characterized in that the stop lugs (20) on the movable switching arm (3) to the current path (6) tapered or rounded cross-section and with their lower longitudinal sides on the top of the fork legs (12th , 13) the current path (6) form linear or strip-shaped contact points for the current transfer from the movable switching arm (3) to the current path (6). 9. Kontaktsystem nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß am Schaltergehäuse (5) unterhalb der Drehzapfen (8) des beweglichen Schaltarmes (3) ein gehäusefester Anschlag (23) vorhanden ist.9. Contact system according to one of claims 1 to 8, characterized in that on the switch housing (5) below the pivot (8) of the movable switching arm (3) has a stop (23) fixed to the housing. 10. Kontaktsystem nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der bewegliche Schaltarm (3) eine die Anschlagnasen (20) und einen Teil des Schaltarmes bis an dessen Kontaktstück (3a) überdeckende Isolier­kappe (2) aus Kunststoff aufweist.10. Contact system according to one of claims 1 to 9, characterized in that the movable switching arm (3) has a stop lugs (20) and part of the switching arm up to its contact piece (3a) covering insulating cap (2) made of plastic. 11. Kontaktsystem nach einem der Ansprüche 1 bis 10, da­durch gekennzeichnet, daß an der Strombahn (6) in Ver­längerung des unteren beweglichen Schaltarmes (3) min­destens eine Lichtbogenführungsrippe (26) vorhanden ist, und daß der bewegliche Schaltarm (3) im Kurz­schlußfall diese Rippe (26) berühren kann.11. Contact system according to one of claims 1 to 10, characterized in that on the current path (6) in extension of the lower movable switching arm (3) at least one arc guide rib (26) is present, and that the movable switching arm (3) in the event of a short circuit Can touch rib (26).
EP90101176A 1989-01-23 1990-01-22 Contact system for a current limiting circuit breaker Expired - Lifetime EP0380012B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3901852A DE3901852A1 (en) 1989-01-23 1989-01-23 CONTACT SYSTEM FOR CURRENT CIRCUIT BREAKERS
DE3901852 1989-01-23

Publications (2)

Publication Number Publication Date
EP0380012A1 true EP0380012A1 (en) 1990-08-01
EP0380012B1 EP0380012B1 (en) 1994-05-18

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Family Applications (1)

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EP90101176A Expired - Lifetime EP0380012B1 (en) 1989-01-23 1990-01-22 Contact system for a current limiting circuit breaker

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EP (1) EP0380012B1 (en)
AT (1) ATE105971T1 (en)
DE (2) DE3901852A1 (en)
ES (1) ES2052979T3 (en)

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WO2011097612A1 (en) * 2010-02-08 2011-08-11 Siemens Aktiengesellschaft Circuit breaker electrical contact assembly, and systems and methods using same
CN102376497A (en) * 2010-08-23 2012-03-14 上海电科电器科技有限公司 Slice-type contact structure of moulded case circuit breaker

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DE4337344B4 (en) * 1993-11-02 2005-08-25 Moeller Gmbh Current limiting contact system for circuit breakers
DE19530492B4 (en) * 1995-08-18 2005-08-04 Siemens Ag Movement contact with cutting edge positioning
DE10218938B4 (en) * 2002-04-19 2004-07-01 Siemens Ag Arrangement for mounting a switching shaft of an electrical switch and low-voltage circuit breaker with an arrangement for mounting the switching shaft
DE10239641B3 (en) * 2002-08-29 2004-02-12 Moeller Gmbh Simplified contact system for low voltage circuit breaker, comprises compression spring with bent end, forming center of pressure and bearing point against contact arm
DE10252741B3 (en) * 2002-11-13 2004-02-26 Moeller Gmbh Contact system for low voltage power switch, has switch piece floating bearing provided by bearing pin located in elongate opening for rotation of switch piece upon abutting stop provided by switch housing
DE102017107441A1 (en) 2017-04-06 2018-10-11 Schaltbau Gmbh Switchgear with contact cover

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EP0146805A2 (en) * 1983-12-19 1985-07-03 Westinghouse Electric Corporation Electric circuit breaker with improved contact structure

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Publication number Priority date Publication date Assignee Title
WO2011097612A1 (en) * 2010-02-08 2011-08-11 Siemens Aktiengesellschaft Circuit breaker electrical contact assembly, and systems and methods using same
US9087665B2 (en) 2010-02-08 2015-07-21 Siemens Aktiengesellschaft Circuit breaker electrical contact assembly, and systems and methods using same
CN102376497A (en) * 2010-08-23 2012-03-14 上海电科电器科技有限公司 Slice-type contact structure of moulded case circuit breaker

Also Published As

Publication number Publication date
EP0380012B1 (en) 1994-05-18
DE59005697D1 (en) 1994-06-23
ATE105971T1 (en) 1994-06-15
ES2052979T3 (en) 1994-07-16
DE3901852A1 (en) 1990-07-26

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