EP0647958A1 - Contact system for a current limiting unit - Google Patents

Contact system for a current limiting unit Download PDF

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Publication number
EP0647958A1
EP0647958A1 EP94114680A EP94114680A EP0647958A1 EP 0647958 A1 EP0647958 A1 EP 0647958A1 EP 94114680 A EP94114680 A EP 94114680A EP 94114680 A EP94114680 A EP 94114680A EP 0647958 A1 EP0647958 A1 EP 0647958A1
Authority
EP
European Patent Office
Prior art keywords
contact
contact arm
connecting conductor
holding
pressure springs
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
EP94114680A
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German (de)
French (fr)
Other versions
EP0647958B1 (en
Inventor
Franz Böder
Bernd Howald
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 GmbH
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Filing date
Publication date
Application filed by Kloeckner Moeller GmbH filed Critical Kloeckner Moeller GmbH
Publication of EP0647958A1 publication Critical patent/EP0647958A1/en
Application granted granted Critical
Publication of EP0647958B1 publication Critical patent/EP0647958B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5833—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5833—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal
    • H01H2001/5838—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal using electrodynamic forces for enhancing the contact pressure between the sliding surfaces

Definitions

  • the invention relates to a current-limiting contact system according to the preamble of claim 1.
  • the invention relates to a contact system for current-limiting units that are combined with circuit breakers or motor protection switches.
  • EP 418 755 A2 describes a three-phase current limiting unit with such a contact system (see FIG. 2 there).
  • Three current-limiting contact systems are arranged side by side in a molded housing.
  • Each contact system consists of a fixed contact carrier with a fixed contact piece and a movable contact arm with a movable contact piece.
  • Contact carrier and contact arm run parallel to each other over a considerable part of their longitudinal extent.
  • Each contact carrier changes into a load-side connection terminal.
  • Each contact arm is mounted on a swivel axis and connected via a flexible connecting conductor (stranded wire) to a connecting conductor which is to be connected to the corresponding output terminal of a circuit breaker.
  • Each contact arm is under the action of a helical torsion spring attached to the pivot axis, so that the movable contact piece is connected to the fixed contact piece under appropriate contact pressure.
  • the electrodynamic repulsive forces which are caused by the short-circuit current running in opposite directions in the contact carrier and in the contact arm, exceed the contact pressure force, which leads to the contact arm spinning open and thus to the opening of the contact system.
  • the arc that arises between the separate contact pieces is deionized in an arc chamber.
  • Another current-limiting contact system is described in EP 418 755 A2 (see FIG. 24 there). With this contact system, the contact arm is on one mounted on the bottom of the molded housing bearing block by means of its pivot axis.
  • a circuit breaker with a contact system is known, the contact arm is pivotally and electrically connected to a bearing point on which the pivot axis for the fork-shaped end of the contact arm is mounted.
  • Biasing means ensure a sufficient conductive connection between the contact arm and the bearing point, which integrally merges into a connecting lug, which in turn is connected to a power connection with the interposition of a bimetallic heating element.
  • This solution does not represent a pure current limiter and is dependent on the switching lock to be triggered subsequently for the electrodynamically opened contact arm to tilt back.
  • the movement of the flung contact arm is disadvantageously limited by moving parts connected to the selector shaft.
  • This contact system is also unfriendly to assembly, because on the one hand a not insignificant number of sometimes complex individual parts has to be assembled and on the other hand with assembly, the high spring forces of the contact pressure springs acting between the contact arm and the swivel axis must be overcome.
  • the invention is therefore based on the object of improving the reliability of the current limiting unit equipped with it, with reduced assembly outlay for a generic contact system.
  • the object is achieved according to the invention by the characterizing features of claim 1.
  • the formation of the connecting conductor with the bearing point, the first and the second support point for the contact arm advantageously fulfills several functions.
  • the simultaneous storage and direct power connection as well as the movement limits for the contact arm create defined reproducible conditions for the current limiting behavior of the contact system.
  • the first support point limits the contact arm until it is lifted.
  • a sufficiently constant contact pressure force is exerted on the contact pieces within the through stroke, which plays a role in the removal of the contact pieces to the permissible extent.
  • the second support point limits the movement and thus the opening angle of the electrodynamically opening contact arm through the contact system itself.
  • the easy-to-mount bearing of the contact arm at the bearing point and the non-positive end bracket of the contact pressure springs allow the uncomplicated assembly of the subsystem connected to the contact arm in the tensioned, stable Condition in the contact room. Due to the provided intermediate bracket, these parts can be preliminarily pre-assembled with little force.
  • the contact pressure springs are then placed in the end bracket with a small amount of force, which results in the tensioned, installable state of the subsystem.
  • a single, suitably designed and arranged contact pressure spring can also be used.
  • the holding of the contact pressure springs by means of holding pins and holding blocks are particularly suitable means for achieving the effects according to the invention.
  • the oblique transition from the auxiliary groove into the holding groove facilitates the transition from the intermediate holder into the end holder of the contact pressure springs.
  • the formation of the contact arm by two contact arm strips is particularly advantageous for storage and the conductive connection to the connecting conductor. This contact is favored by the pressure spring.
  • the prismatic seating of the holding block on the holding web facilitates assembly and serves the mechanical stability of the subsystem.
  • the mentioned training of the support points are particularly sensible with regard to simple manufacture and reliable function of the contact system.
  • the symmetrical design of the holding block allows it to be installed in two positions rotated by 180 °, which leads to a reduction in assembly errors.
  • the three-pole current limiting unit is enclosed by a molded housing, which consists of a lower part 2 and a closing cover 4.
  • a molded housing which consists of a lower part 2 and a closing cover 4.
  • switching chambers 8 and circuit breaker-side connection openings 10 are provided in the lower part 2 in the lower part 2 in the lower part 2 in the lower part 2 in the lower part 2 in the lower part 2 in the lower part 2 in the lower part 2 three load-side connection spaces 6, switching chambers 8 and circuit breaker-side connection openings 10 are provided.
  • each switching chamber 8 is a contact system 12 and a quenching plate package 14 with associated partition plate 16, blow-out valve plate 18 and closure plate 20 embedded.
  • the contact system 12 consists of a fixed contact carrier 22 and a preassembled subsystem 24.
  • the contact carrier 22 is inserted in a form-fitting manner in the lower part 2, carries a fixed contact piece 26 at one end and, at the other end, angled into a second power connection 32 which leads into the connection space
  • the subsystem 24 has a movable contact arm 34 with a movable contact piece 28 at the end, which is in conductive connection with the immovable contact piece 26 under normal conditions.
  • the contact arm 34 is pivotally connected to a connecting conductor 36.
  • the connection conductor 36 merges at the end into a first power connection 30 which extends through the connection opening 10. With screws 38, the connecting conductor 36 is fastened by means of its through holes 40 and thus the preassembled subsystem 24 to the bottom of the switching chamber 8.
  • the current flow runs from the first current connection 30 via the connecting conductor 36, the contact arm 34, the movable contact piece 28, the fixed contact piece 26 and the contact carrier 22 to the second current connection 32.
  • the current runs in opposite directions, whereby in In the event of a short circuit, an electrodynamic force is generated which tends to push the contact arm 34 away from the contact carrier 22.
  • the contact arm 34 consists of two mirror-image parallel contact arm strips 42.
  • the contact arm strips 42 are connected to one another at the end to form the movable contact piece 28 and, at the other end, are spaced apart from one another by means of a pivot axis 44 at a bearing point 46 of the connecting conductor 36.
  • the bearing point 46 is formed at right angles from the connecting conductor 36.
  • Corresponding bearing bores 48 and 50 are provided in the contact arm strips 42 and the bearing point 46 for mounting the pivot axis 44.
  • the bearing point 46 continues in a cuboid-shaped holding web 56 facing away from the contact arm 34 in a web-like manner.
  • a holding block 58 with a corresponding prismatic shape 60 sits on the holding web 56.
  • the holding block 58 consists of insulating material and is constructed symmetrically with respect to its central plane running with the holding web 56, so that the holding web 56 can also be placed in the position offset by 180 ° with respect to this central plane.
  • the holding block 58 On the side facing away from the contact arm 34, the holding block 58 has two mutually symmetrical auxiliary grooves 62 and a holding groove 64 located in between.
  • the grooves 62, 64 run parallel to the pivot axis 44.
  • the auxiliary grooves 62 merge into the holding groove 64 through a respective slope 66.
  • the points of contact of the contact pressure springs 72 on the holding pins 68, 70 form a plane which is located between the pivot axis 44 and the contact carrier 22. Due to this spatial arrangement of the contact pressure springs 72, the contact arm 34 is acted upon in the direction of the fixed contact piece 26, that is to say the contact pieces 26 and 28 stand under contact pressure. Due to the transition of the bearing point 46 into the somewhat thicker retaining web 56, shoulders 74 have been formed, against which supporting surfaces 76 located on the end face of the contact arm strips 42 can be supported. The shoulders 74 and the support surfaces 76 form a first support point which faces the contact carrier 22 with respect to the plane formed by the pivot axis 44 and the second retaining pin 70.
  • the movement of the contact arm 34 in the preassembled state of the subsystem 24 caused by the contact pressure springs 72 is limited by the first support point.
  • the subsystem 24 can be easily installed in the switching chamber 8.
  • the range of motion of the movable contact piece 28, which results from the position difference between the pressure-induced contacting of the non-worn contact pieces 26, 28 and the support of the contact arm 34 on the first support point, is referred to as through-stroke.
  • the contact pieces 26, 28 can be removed by erosion up to the permissible degree of through-stroke, a sufficiently constant contact pressure force being exerted on the contact pieces 26, 28 that are in contact.
  • the electrodynamic opening behavior of the contact system 12 is further determined by the limitation of the opening angle.
  • a second support point is provided for this limitation. This second support point consists of a stop surface 78 which is inclined in accordance with the maximum opening angle of the contact arm 34 and, on the other hand, supportable surface parts 80 on the contact arm 34 the bearing 46 and this was outstandingly developed.
  • the surface parts 80 interacting with the stop surface 78 result in the end faces of the contact arm strips 42 facing away from the movable contact piece 28.
  • the first holding pin 68 is still facing the contact carrier 22 with respect to the plane formed by the second holding pin 70 and the pivot axis 44 , so that after switching off the short circuit, the contact arm 34 comes back into contact with the fixed contact piece 26.
  • the contact arm 34 is first mounted with the pivot axis 44 and the pressure spring 51 at the bearing 46.
  • the contact pressure springs 72 are hooked onto the first retaining pin 68 inserted into the contact arm 34.
  • the second retaining pin 70 is inserted into the auxiliary groove 62, which is furthest away from the pivot axis 44, of the retaining block 58 placed on the connecting conductor 36, and the contact pressure springs 72 are suspended at its ends with little application of force.
  • the contact arm 34 is already subjected to a slight force from the contact pressure springs 72 and is in a stable state due to the movement limitation by the first support point. In this intermediate state, the contact pressure springs 72 are in the position shown in broken lines.
  • the subsystem 24 is brought into the final preassembled state in that the second retaining pin 70 together with the contact pressure springs 72 is pushed into the retaining groove 64 with little effort by utilizing the laws of the inclined plane via the slope 66.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to a contact system for current limiting units which are combined with power circuit breakers (power switches) or motor protective circuit breakers. The problem to be solved is to improve the reliability of a current limiting unit which is fitted with such a contact system while reducing the assembly cost (installation cost) for said contact system. To this end, the contact systems consist of a contact carrier with a stationary contact piece and a partial system (24) which can be preinstalled using small amounts of force and can be installed in the switching chambers in a condition which is stable and is subject to the action of the force of contact pressure springs (72). The partial system contains the contact arm (34) which is provided with the moving contact piece (28) and is mounted on a connecting conductor (36), with a direct electrical connection. Supporting points in the partial system (24) limit the movement of the contact arm in both directions. A retaining block (58), which is provided with a retaining groove (64) and an auxiliary groove (62), in order to hold those parts which are connected to the contact pressure springs in a force-fitting manner, makes preliminary assembly of the partial system possible via an intermediate condition, which is likewise stable. <IMAGE>

Description

Die Erfindung betrifft ein strombegrenzendes Kontaktsystem nach dem Oberbegriff des Anspruches 1. Insbesondere betrifft die Erfindung ein Kontaktsystem für Strombegrenzungseinheiten, die mit Leistungs- oder Motorschutzschaltern kombiniert werden.The invention relates to a current-limiting contact system according to the preamble of claim 1. In particular, the invention relates to a contact system for current-limiting units that are combined with circuit breakers or motor protection switches.

In der EP 418 755 A2 ist eine dreiphasige Strombegrenzungseinheit mit einem derartigen Kontaktsystem beschrieben (siehe dort Fig. 2). In einem Formgehäuse sind nebeneinander drei strombegrenzende Kontaktsysteme angeordnet. Jedes Kontaktsystem besteht aus einem feststehenden Kontaktträger mit einem feststehenden Kontaktstück und einem beweglichen Kontaktarm mit einem beweglichen Kontaktstück. Kontaktträger und Kontaktarm verlaufen über einen erheblichen Teil ihrer Längsausdehnung parallel zueinander. Jeder Kontaktträger geht in eine lastseitige Anschlußklemme über. Jeder Kontaktarm ist auf einer Schwenkachse gelagert und über einen flexiblen Verbindungsleiter (Litze) mit einem Anschlußleiter verbunden, der mit der entsprechenden Ausgangsklemme eines Leistungsschalters zu verbinden ist. Jeder Kontaktarm steht unter der Einwirkung einer an der Schwenkachse angebrachten Schraubendrehfeder, so daß das bewegliche Kontaktstück unter entsprechendem Kontaktdruck mit dem feststehenden Kontaktstück in Verbindung steht. Im Kurzschlußfall übersteigen die elektrodynamischen Abstoßungskräfte, die durch den gegensinnig im Kontaktträger und im Kontaktarm verlaufenden Kurzschlußstrom hervorgerufen werden, die Kontaktdruckkraft, was zum Aufschleudern des Kontaktarmes und damit zum Öffnen des Kontaktsystems führt. Der zwischen den getrennten Kontaktstücken entstehende Lichtbogen wird in einer Lichtbogenkammer deionisiert. In der EP 418 755 A2 ist noch ein weiteres strombegrenzendes Kontaktsystem beschrieben (siehe dort Fig. 24). Bei diesem Kontaktsystem ist der Kontaktarm an einen mit dem Formgehäuseboden verbundenen Lagerbock mittels seiner Schwenkachse gelagert. Zwischen Kontaktarm und Lagerbock greifen beidseitig über formschlüssig gelagerte Haltestifte Schraubenzugfedern an, um den notwendigen Kontaktdruck zu erzeugen. Die Nachteile dieser Kontaktsysteme bestehen darin, daß die Kontaktsysteme durch die notwendig hohe Vorspannung der Kontaktdruckfedern nur in aufwendiger Weise und unter großen Kraftanwendungen in das Formgehäuse montiert werden können, daß der Öffnungswinkel beim Aufschleudern des Kontaktarmes nicht definiert ist und daß die Stromübertragung zwischen Kontaktarm und Anschlußleiter nicht direkt erfolgt. Das Aufschleudern wird entweder durch die Gegenkräfte der Kontaktdruckfedern oder durch Anschlagen an das Formgehäuse begrenzt. Im ersten Falle könnten durch Überdehnung die Kontaktdruckfedern und im zweiten Falle Formgehäuseteile durch Anschlagen oder Verschmelzen geschädigt werden. Durch die Krafteinwirkung des zwischengeschalteten flexiblen Verbindungsleiters ist das elektrodynamische Verhalten und damit der untere Grenzwert für den öffnenden Kurzschlußstrom nicht mit ausreichender Genauigkeit zu reproduzieren.EP 418 755 A2 describes a three-phase current limiting unit with such a contact system (see FIG. 2 there). Three current-limiting contact systems are arranged side by side in a molded housing. Each contact system consists of a fixed contact carrier with a fixed contact piece and a movable contact arm with a movable contact piece. Contact carrier and contact arm run parallel to each other over a considerable part of their longitudinal extent. Each contact carrier changes into a load-side connection terminal. Each contact arm is mounted on a swivel axis and connected via a flexible connecting conductor (stranded wire) to a connecting conductor which is to be connected to the corresponding output terminal of a circuit breaker. Each contact arm is under the action of a helical torsion spring attached to the pivot axis, so that the movable contact piece is connected to the fixed contact piece under appropriate contact pressure. In the event of a short circuit, the electrodynamic repulsive forces, which are caused by the short-circuit current running in opposite directions in the contact carrier and in the contact arm, exceed the contact pressure force, which leads to the contact arm spinning open and thus to the opening of the contact system. The arc that arises between the separate contact pieces is deionized in an arc chamber. Another current-limiting contact system is described in EP 418 755 A2 (see FIG. 24 there). With this contact system, the contact arm is on one mounted on the bottom of the molded housing bearing block by means of its pivot axis. Between the contact arm and the bearing block, tension springs engage on both sides via positively mounted retaining pins in order to generate the necessary contact pressure. The disadvantages of these contact systems are that the contact systems can only be installed in the mold housing in a complex manner and under great force, due to the high preload of the contact pressure springs, that the opening angle is not defined when the contact arm is spun on, and that the current transmission between the contact arm and the connecting conductor not done directly. The spin-on is limited either by the opposing forces of the contact pressure springs or by striking the molded housing. In the first case, the contact pressure springs could be damaged by overextension, and in the second case, molded housing parts could be damaged by striking or fusing. The electrodynamic behavior and thus the lower limit value for the opening short-circuit current cannot be reproduced with sufficient accuracy due to the force of the interposed flexible connecting conductor.

Nach der DE 34 11 276 C2 ist ein Leistungsschalter mit einem Kontaktsystem bekannt, dessen Kontaktarm schwenkbar und elektrisch leitend mit einer Lagerstelle verbunden ist, an der die Schwenkachse für das gabelförmige Ende des Kontaktarmes gelagert ist. Vorspannmittel gewährleisten eine ausreichende leitende Verbindung zwischen Kontaktarm und Lagerstelle, die einstückig in eine Anschlußlasche übergeht, die ihrerseits unter Zwischenschaltung eines Bimetallheizelementes mit einem Stromanschluß verbunden ist. Diese Lösung stellt keinen reinen Strombegrenzer dar und ist für das Zurückkippen des elektrodynamisch geöffneten Kontaktarmes auf das nachfolgend auszulösende Schaltschloß angewiesen. Die Bewegung des aufgeschleuderten Kontaktarmes wird in nachteiliger Weise durch mit der Schaltwelle verbundene bewegliche Teile begrenzt. Dieses Kontaktsystem ist zudem montageunfreundlich, da zum einen eine nicht geringe Anzahl von zum Teil komplexen Einzelteilen zu montieren ist und zum anderen bei der Montage die hohen Federkräfte der zwischen Kontaktarm und Schwenkachse angreifenden Kontaktdruckfedern zu überwinden sind.According to DE 34 11 276 C2 a circuit breaker with a contact system is known, the contact arm is pivotally and electrically connected to a bearing point on which the pivot axis for the fork-shaped end of the contact arm is mounted. Biasing means ensure a sufficient conductive connection between the contact arm and the bearing point, which integrally merges into a connecting lug, which in turn is connected to a power connection with the interposition of a bimetallic heating element. This solution does not represent a pure current limiter and is dependent on the switching lock to be triggered subsequently for the electrodynamically opened contact arm to tilt back. The movement of the flung contact arm is disadvantageously limited by moving parts connected to the selector shaft. This contact system is also unfriendly to assembly, because on the one hand a not insignificant number of sometimes complex individual parts has to be assembled and on the other hand with assembly, the high spring forces of the contact pressure springs acting between the contact arm and the swivel axis must be overcome.

Der Erfindung liegt daher die Aufgabe zugrunde, bei vermindertem Montageaufwand für ein gattungsgemäßes Kontaktsystem die Zuverlässigkeit der damit bestückten Strombegrenzungseinheit zu verbessern.The invention is therefore based on the object of improving the reliability of the current limiting unit equipped with it, with reduced assembly outlay for a generic contact system.

Ausgehend von einem Kontaktsystem der eingangs genannten Art wird die Aufgabe erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Durch die Ausbildung des Anschlußleiters mit der Lagerstelle, der ersten und der zweiten Stützstelle für den Kontaktarm werden mit Vorteil mehrere Funktionen erfüllt. Die gleichzeitige Lagerung und direkte Stromverbindung sowie die Bewegungsgrenzen für den Kontaktarm schaffen definierte reproduzierbare Bedingungen für das Strombegrenzungsverhalten des Kontaktsystems. Die erste Stützstelle begrenzt den kontaktgebenden Kontaktarm bis zum Durchhub. Innerhalb des Durchhubes, der bei Abtragung der Kontaktstücke bis auf das zulässige Maß eine Rolle spielt, wird eine ausreichend gleichbleibende Kontaktdruckkraft auf die Kontaktstücke ausgeübt. Die zweite Stützstelle begrenzt die Bewegung und damit den Öffnungswinkel des elektrodynamisch sich öffnenden Kontaktarmes durch das Kontaktsystem selbst. Die leicht zu montierende Lagerung des Kontaktarmes an der Lagerstelle sowie die kraftschlüssige Endhalterung der Kontaktdruckfedern erlauben die unkomplizierte Montage des mit dem Kontaktarm verbundenen Teilsystems im gespannten, stabilen Zustand in den Kontaktraum. Durch die vorgesehene Zwischenhalterung können diese Teile vorläufig unter geringer Kraftanwendung vormontiert werden. Anschließend werden die Kontaktdruckfedern mit ebenfalls geringer Kraftanwendung in die Endhalterung verbracht, wodurch der gespannte, einbaubare Zustand des Teilsystems erreicht wird. Selbstverständlich kann auch eine einzige, geeignet ausgebildete und angeordnete, Kontaktdruckfeder verwendet werden.Starting from a contact system of the type mentioned in the introduction, the object is achieved according to the invention by the characterizing features of claim 1. The formation of the connecting conductor with the bearing point, the first and the second support point for the contact arm advantageously fulfills several functions. The simultaneous storage and direct power connection as well as the movement limits for the contact arm create defined reproducible conditions for the current limiting behavior of the contact system. The first support point limits the contact arm until it is lifted. A sufficiently constant contact pressure force is exerted on the contact pieces within the through stroke, which plays a role in the removal of the contact pieces to the permissible extent. The second support point limits the movement and thus the opening angle of the electrodynamically opening contact arm through the contact system itself. The easy-to-mount bearing of the contact arm at the bearing point and the non-positive end bracket of the contact pressure springs allow the uncomplicated assembly of the subsystem connected to the contact arm in the tensioned, stable Condition in the contact room. Due to the provided intermediate bracket, these parts can be preliminarily pre-assembled with little force. The contact pressure springs are then placed in the end bracket with a small amount of force, which results in the tensioned, installable state of the subsystem. Of course, a single, suitably designed and arranged contact pressure spring can also be used.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen zu entnehmen. Die Halterung der Kontaktdruckfedern mittels Haltestiften und Halteklotz stellen besonders geeignete Mittel zur Erreichung der erfindungsgemäßen Wirkungen dar. Der schräge Ubergang von der Hilfsnut in die Haltenut erleichtert den Übergang von der Zwischenhalterung in die Endhalterung der Kontaktdruckfedern. Die Ausbildung des Kontaktarmes durch zwei Kontaktarmstreifen ist besonders vorteilhaft für die Lagerung und die leitende Verbindung zum Anschlußleiter dar. Durch die Anpreßfeder wird diese elektrische Verbindung begünstigt. Das prismatische Aufsitzen des Halteklotzes an dem Haltesteg erleichtert die Montage und dient der mechanischen Stabilität des Teilsystems. Die angeführten Ausbildungen der Stützstellen sind besonders sinnfällig in Hinblick auf eine einfache Herstellung und sichere Funktion des Kontaktsystems. Die symmetrische Ausbildung des Halteklotzes erlaubt dessen Montage in zwei um 180° verdrehten Lagen, was zu einer Senkung von Montagefehlern führt.Further advantageous embodiments of the invention can be found in the subclaims. The holding of the contact pressure springs by means of holding pins and holding blocks are particularly suitable means for achieving the effects according to the invention. The oblique transition from the auxiliary groove into the holding groove facilitates the transition from the intermediate holder into the end holder of the contact pressure springs. The formation of the contact arm by two contact arm strips is particularly advantageous for storage and the conductive connection to the connecting conductor. This contact is favored by the pressure spring. The prismatic seating of the holding block on the holding web facilitates assembly and serves the mechanical stability of the subsystem. The mentioned training of the support points are particularly sensible with regard to simple manufacture and reliable function of the contact system. The symmetrical design of the holding block allows it to be installed in two positions rotated by 180 °, which leads to a reduction in assembly errors.

Die Erfindung soll nachstehend an einem Ausführungsbeispiel, aus dem weitere Einzelheiten und Vorteile zu ersehen sind, näher erläutert werden. In der zugehörigen Zeichnung zeigt

Figur 1:
eine Strombegrenzungseinheit mit einem erfindungsgemäßen Kontaktsystem in Explosionsdarstellung;
Figur 2:
ein Teilsystem des Kontaktsystems in Explosionsdarstellung;
Figur 3:
die Teile aus Fig. 2 im vormontierten Zustand in Seitenansicht.
The invention will be explained in more detail below using an exemplary embodiment from which further details and advantages can be seen. In the accompanying drawing shows
Figure 1:
a current limiting unit with a contact system according to the invention in an exploded view;
Figure 2:
a subsystem of the contact system in an exploded view;
Figure 3:
the parts of Fig. 2 in the pre-assembled state in side view.

Nach Fig. 1 wird die dreipolige Strombegrenzungseinheit von einem Formgehäuse umschlossen, das aus einem Unterteil 2 und einem abschließenden Deckel 4 besteht. Im Unterteil 2 sind jeweils drei lastseitige Anschlußräume 6, Schaltkammern 8 und schutzschalterseitige Anschlußöffnungen 10 vorgesehen. In jede Schaltkammer 8 ist ein Kontaktsystem 12 und ein Löschblechpaket 14 mit zugehöriger Trennplatte 16, Ausblasventilplatte 18 und Verschlußplatte 20 eingelassen. Das Kontaktsystem 12 besteht aus einem feststehenden Kontaktträger 22 und einem vormontierten Teilsystem 24. Der Kontaktträger 22 ist formschlüssig im Unterteil 2 eingesetzt, trägt an einem Ende ein feststehendes Kontaktstück 26 und geht am anderen Ende abgewinkelt in einen zweiten Stromanschluß 32 über, der in den Anschlußraum 6 reicht. Das Teilsystem 24 weist einen beweglichen Kontaktarm 34 mit einem endseitigen beweglichen Kontaktstück 28 auf, das mit dem unbeweglichen Kontaktstück 26 unter Normalbedingungen in leitender Verbindung steht. Der Kontaktarm 34 ist schwenkbar mit einem Anschlußleiter 36 verbunden. Der Anschlußleiter 36 geht endseitig in einen ersten Stromanschluß 30 über, der durch die Anschlußöffnung 10 reicht. Mit Schrauben 38 wird der Anschlußleiter 36 mittels seiner Durchgangsbohrungen 40 und damit das vormontierte Teilsystem 24 am Boden der Schaltkammer 8 befestigt. Der Stromfluß verläuft vom ersten Stromanschluß 30 über den Anschlußleiter 36, den Kontaktarm 34, das bewegliche Kontaktstück 28, das feststehende Kontaktstück 26 und den Kontaktträger 22 zum zweiten Stromanschluß 32. Im Kontaktarm 34 und im Kontaktträger 22 verläuft der Strom in entgegengesetzten Richtungen, wodurch im Kurzschlußfall eine elektrodynamische Kraft erzeugt wird, die den Kontaktarm 34 vom Kontaktträger 22 wegzustoßen bestrebt ist.According to FIG. 1, the three-pole current limiting unit is enclosed by a molded housing, which consists of a lower part 2 and a closing cover 4. In the lower part 2 three load-side connection spaces 6, switching chambers 8 and circuit breaker-side connection openings 10 are provided. In each switching chamber 8 is a contact system 12 and a quenching plate package 14 with associated partition plate 16, blow-out valve plate 18 and closure plate 20 embedded. The contact system 12 consists of a fixed contact carrier 22 and a preassembled subsystem 24. The contact carrier 22 is inserted in a form-fitting manner in the lower part 2, carries a fixed contact piece 26 at one end and, at the other end, angled into a second power connection 32 which leads into the connection space 6 is enough. The subsystem 24 has a movable contact arm 34 with a movable contact piece 28 at the end, which is in conductive connection with the immovable contact piece 26 under normal conditions. The contact arm 34 is pivotally connected to a connecting conductor 36. The connection conductor 36 merges at the end into a first power connection 30 which extends through the connection opening 10. With screws 38, the connecting conductor 36 is fastened by means of its through holes 40 and thus the preassembled subsystem 24 to the bottom of the switching chamber 8. The current flow runs from the first current connection 30 via the connecting conductor 36, the contact arm 34, the movable contact piece 28, the fixed contact piece 26 and the contact carrier 22 to the second current connection 32. In the contact arm 34 and in the contact carrier 22 the current runs in opposite directions, whereby in In the event of a short circuit, an electrodynamic force is generated which tends to push the contact arm 34 away from the contact carrier 22.

In Fig. 2 sind die mit dem Kontaktarm 34 vormontierbaren Teile als Teilsystem 24 im einzelnen dargestellt. Der Kontaktarm 34 besteht aus zwei spiegelbildlich parallelen Kontaktarmstreifen 42. Die Kontaktarmstreifen 42 sind endseitig zum beweglichen Kontaktstück 28 miteinander verbunden und am anderen Ende voneinander beabstandet mittels einer Schwenkachse 44 an einer Lagerstelle 46 des Anschlußleiters 36 gelagert. Die Lagerstelle 46 ist rechtwinklig aus dem Anschlußleiter 36 herausgebildet. Zur Lagerung der Schwenkachse 44 sind entsprechende Lagerbohrungen 48 und 50 in den Kontaktarmstreifen 42 und der Lagerstelle 46 vorgesehen. Um die erforderliche Anpreßkraft für eine ausreichend gute elektrische Verbindung zwischen der Lagerstelle 46 und den diese beidseitig umgreifenden Kontaktarmstreifen 42 herzustellen, sind zum einen die beabstandeten Kontaktarmstreifen 42 nach innen vorgespannt und ist zum anderen eine U-förmige Anpreßfeder 51, die Kontaktarmstreifen 42 umschließend, mittels entsprechender Halterungsbohrungen 52 an der Schwenkachse 44 gehaltert.2 shows the parts which can be preassembled with the contact arm 34 as a subsystem 24 in detail. The contact arm 34 consists of two mirror-image parallel contact arm strips 42. The contact arm strips 42 are connected to one another at the end to form the movable contact piece 28 and, at the other end, are spaced apart from one another by means of a pivot axis 44 at a bearing point 46 of the connecting conductor 36. The bearing point 46 is formed at right angles from the connecting conductor 36. Corresponding bearing bores 48 and 50 are provided in the contact arm strips 42 and the bearing point 46 for mounting the pivot axis 44. To the necessary contact pressure for a sufficiently good electrical connection between the bearing 46 and the to produce these contact arm strips 42 encompassing on both sides, on the one hand the spaced-apart contact arm strips 42 are prestressed inwards and on the other hand a U-shaped contact spring 51, surrounding the contact arm strips 42, is held on the pivot axis 44 by means of corresponding mounting holes 52.

Die Lagerstelle 46 setzt sich stegartig vom Kontaktarm 34 abgewandt in einem quaderförmigen Haltesteg 56 fort. Auf dem Haltesteg 56 sitzt ein Halteklotz 58 mit einer entsprechenden prismatischen Ausformung 60 auf. Der Halteklotz 58 besteht aus Isolierstoff und ist bezüglich seiner mit dem Haltesteg 56 verlaufenden Mittelebene symmetrisch aufgebaut, so daß der Haltesteg 56 auch in der zu dieser Mittelebene um 180° versetzten Lage aufgesetzt werden kann. Auf der vom Kontaktarm 34 abgewandten Seite weist der Halteklotz 58 zwei zueinander symmetrische Hilfsnuten 62 und eine mittig dazwischen befindliche Haltenut 64 auf. Die Nuten 62, 64 verlaufen parallel zur Schwenkachse 44. Die Hilfsnuten 62 gehen durch jeweils eine Schräge 66 in die Haltenut 64 über. In den Kontaktarmstreifen 42 befinden sich zwischen dem beweglichen Kontaktstück 28 und den Lagerbohrungen 48 weitere Haltebohrungen 54 für einen mittig in diesen gehalterten ersten Haltestift 68. Ein zweiter Haltestift 70 befindet sich in der Haltenut 64. Zwischen den übergreifenden Enden der Haltestifte 68, 70 ist zu beiden Seiten des Kontaktarmes 34 jeweils eine schraubenförmige und auf Zug beanspruchte Kontaktdruckfeder 72 mit ihren hakenförmigen Enden eingehängt. Durch die Krafteinwirkung der Kontaktdruckfedern 72 wird der zweite Haltestift 70 in der Haltenut 64 und mit diesem der Halteklotz 58 auf dem Haltesteg 56 kraftschlüssig gehaltert.The bearing point 46 continues in a cuboid-shaped holding web 56 facing away from the contact arm 34 in a web-like manner. A holding block 58 with a corresponding prismatic shape 60 sits on the holding web 56. The holding block 58 consists of insulating material and is constructed symmetrically with respect to its central plane running with the holding web 56, so that the holding web 56 can also be placed in the position offset by 180 ° with respect to this central plane. On the side facing away from the contact arm 34, the holding block 58 has two mutually symmetrical auxiliary grooves 62 and a holding groove 64 located in between. The grooves 62, 64 run parallel to the pivot axis 44. The auxiliary grooves 62 merge into the holding groove 64 through a respective slope 66. In the contact arm strips 42 there are between the movable contact piece 28 and the bearing bores 48 further holding bores 54 for a first holding pin 68 held in the middle thereof. A second holding pin 70 is located in the holding groove 64 Both sides of the contact arm 34 each have a helical and stressed contact compression spring 72 hooked in with their hook-shaped ends. Due to the force of the contact pressure springs 72, the second retaining pin 70 is held in the retaining groove 64 and with this the retaining block 58 on the retaining web 56 in a non-positive manner.

Nach Fig. 2 und Fig. 3 bilden die Angriffspunkte der Kontaktdruckfedern 72 an den Haltestiften 68, 70 eine Ebene, die sich zwischen der Schwenkachse 44 und dem Kontaktträger 22 befindet. Durch diese räumliche Anordnung der Kontaktdruckfedern 72 wird der Kontaktarm 34 in Richtung des feststehenden Kontaktstückes 26 beaufschlagt, das heißt, die Kontaktstücke 26 und 28 stehen unter Kontaktdruck. Durch den Übergang der Lagerstelle 46 in den etwas dickeren Haltesteg 56 sind Absätze 74 gebildet worden, gegen die sich entsprechend stirnseitig an den Kontaktarmstreifen 42 befindliche Stützflächen 76 abstützen können. Durch die Absätze 74 und die Stützflächen 76 wird eine erste Stützstelle gebildet, die sich bezüglich der von der Schwenkachse 44 und dem zweiten Haltestift 70 gebildeten Ebene zum Kontaktträger 22 gewandt befindet. Durch die erste Stützstelle wird die von den Kontaktdruckfedern 72 bewirkte Bewegung des Kontaktarmes 34 im vormontierten Zustand des Teilsystems 24 begrenzt. Dadurch läßt sich das Teilsystem 24 problemlos in die Schaltkammer 8 einbauen. Der Bewegungsspielraum des beweglichen Kontaktstückes 28, der sich aus der Stellungsdifferenz zwischen der druckbewirkten Kontaktgabe der nichtabgenutzten Kontaktstücke 26, 28 und der Abstützung des Kontaktarmes 34 auf die erste Stützstelle ergibt, wird mit Durchhub bezeichnet. Bis auf das zulässige Maß des Durchhubes können die Kontaktstücke 26, 28 durch Abbrand abgetragen werden, wobei eine ausreichend konstante Kontaktdruckkraft auf die sich berührenden Kontaktstücke 26, 28 ausgeübt wird.According to FIGS. 2 and 3, the points of contact of the contact pressure springs 72 on the holding pins 68, 70 form a plane which is located between the pivot axis 44 and the contact carrier 22. Due to this spatial arrangement of the contact pressure springs 72, the contact arm 34 is acted upon in the direction of the fixed contact piece 26, that is to say the contact pieces 26 and 28 stand under contact pressure. Due to the transition of the bearing point 46 into the somewhat thicker retaining web 56, shoulders 74 have been formed, against which supporting surfaces 76 located on the end face of the contact arm strips 42 can be supported. The shoulders 74 and the support surfaces 76 form a first support point which faces the contact carrier 22 with respect to the plane formed by the pivot axis 44 and the second retaining pin 70. The movement of the contact arm 34 in the preassembled state of the subsystem 24 caused by the contact pressure springs 72 is limited by the first support point. As a result, the subsystem 24 can be easily installed in the switching chamber 8. The range of motion of the movable contact piece 28, which results from the position difference between the pressure-induced contacting of the non-worn contact pieces 26, 28 and the support of the contact arm 34 on the first support point, is referred to as through-stroke. The contact pieces 26, 28 can be removed by erosion up to the permissible degree of through-stroke, a sufficiently constant contact pressure force being exerted on the contact pieces 26, 28 that are in contact.

Durch die elektrodynamische Einwirkung eines hohen Stromes im Kurzschlußfall wird der Kontaktarm 34 unter Überwindung der Kontaktdruckkräfte vom feststehenden Kontaktstück 26 weggeschleudert. Dieses strombegrenzende Öffnen ist durch die direkte elektrische Verbindung von Anschlußleiter 36 und Kontaktarm 34 unbeeinflußt von undefinierten Krafteinwirkungen eines flexiblen Verbindungsleiters nach dem Stand der Technik. Das elektrodynamische Öffnungsverhalten des Kontaktsystems 12 wird weiterhin durch die Begrenzung des Öffnungswinkels bestimmter. Für diese Begrenzung ist eine zweite Stützstelle vorgesehen. Diese zweite Stützstelle besteht aus einer entsprechend dem maximalen Öffnungswinkel des Kontaktarmes 34 geneigten Anschlagfläche 78 und dagegen abstützbaren Flächenteilen 80 am Kontaktarm 34. Die Anschlagfläche 78 befindet sich endseitig und dem Kontaktarm 34 zugewandt an einem Anschlagsteg 82, der durch Abwinkelung aus dem Anschlußleiter 36 zusammen mit der Lagerstelle 46 und diese überragend herausgebildet wurde. Die mit der Anschlagfläche 78 zusammenwirkenden Flächenteile 80 ergeben sich als vom beweglichen Kontaktstück 28 abgewandte Stirnflächen der Kontaktarmstreifen 42. Beim Erreichen des maximalen Öffnungswinkels befindet sich der erste Haltestift 68 bezüglich der durch den zweiten Haltestift 70 und die Schwenkachse 44 gebildeten Ebene noch dem Kontaktträger 22 zugewandt, so daß nach dem Abschalten des Kurzschlusses der Kontaktarm 34 wieder mit dem feststehenden Kontaktstück 26 in Verbindung kommt.Due to the electrodynamic action of a high current in the event of a short circuit, the contact arm 34 is flung away from the fixed contact piece 26 while overcoming the contact pressure forces. This current-limiting opening is unaffected by the undefined force effects of a flexible connecting conductor according to the prior art due to the direct electrical connection of connecting conductor 36 and contact arm 34. The electrodynamic opening behavior of the contact system 12 is further determined by the limitation of the opening angle. A second support point is provided for this limitation. This second support point consists of a stop surface 78 which is inclined in accordance with the maximum opening angle of the contact arm 34 and, on the other hand, supportable surface parts 80 on the contact arm 34 the bearing 46 and this was outstandingly developed. The surface parts 80 interacting with the stop surface 78 result in the end faces of the contact arm strips 42 facing away from the movable contact piece 28. When the maximum opening angle is reached, the first holding pin 68 is still facing the contact carrier 22 with respect to the plane formed by the second holding pin 70 and the pivot axis 44 , so that after switching off the short circuit, the contact arm 34 comes back into contact with the fixed contact piece 26.

Mit Fig. 3 wird die Vormontage des Teilsystems 24 veranschaulicht. Der Kontaktarm 34 wird zuerst mit der Schwenkachse 44 und der Anpreßfeder 51 an der Lagerstelle 46 gelagert. An den in den Kontaktarm 34 eingesetzten ersten Haltestift 68 werden die Kontaktdruckfedern 72 eingehängt. Der zweite Haltestift 70 wird in die am weitesten von der Schwenkachse 44 abgewandte Hilfsnut 62 des auf den Anschlußleiter 36 aufgesetzten Halteklotzes 58 eingelegt, und an seinen Enden werden die Kontaktdruckfedern 72 unter geringer Kraftanwendung eingehängt. Der Kontaktarm 34 gelangt dadurch bereits unter eine geringe Krafteinwirkung der Kontaktdruckfedern 72 und befindet sich infolge der Bewegungsbegrenzung durch die erste Stützstelle in einem stabilen Zustand. In diesem Zwischenzustand befinden sich die Kontaktdruckfedern 72 in der gestrichelt dargestellten Position. In den endgültigen vormontierten Zustand wird das Teilsystem 24 dadurch gebracht, daß der zweite Haltestift 70 samt Kontaktdruckfedern 72 mit geringem Kraftaufwand durch Ausnutzung der Gesetze der schiefen Ebene über die Schräge 66 in die Haltenut 64 geschoben wird.3 shows the preassembly of subsystem 24. The contact arm 34 is first mounted with the pivot axis 44 and the pressure spring 51 at the bearing 46. The contact pressure springs 72 are hooked onto the first retaining pin 68 inserted into the contact arm 34. The second retaining pin 70 is inserted into the auxiliary groove 62, which is furthest away from the pivot axis 44, of the retaining block 58 placed on the connecting conductor 36, and the contact pressure springs 72 are suspended at its ends with little application of force. As a result, the contact arm 34 is already subjected to a slight force from the contact pressure springs 72 and is in a stable state due to the movement limitation by the first support point. In this intermediate state, the contact pressure springs 72 are in the position shown in broken lines. The subsystem 24 is brought into the final preassembled state in that the second retaining pin 70 together with the contact pressure springs 72 is pushed into the retaining groove 64 with little effort by utilizing the laws of the inclined plane via the slope 66.

BezugszeichenlisteReference list

22nd
UnterteilLower part
44th
Deckelcover
66
AnschlußraumTerminal compartment
88th
SchaltkammerInterrupter
1010th
AnschlußöffnungConnection opening
1212th
KontaktsystemContact system
1414
LöschblechpaketExtinguishing sheet package
1616
TrennplattePartition plate
1818th
AusblasventilplatteBlow-out valve plate
2020th
VerschlußplatteLocking plate
2222
KontaktträgerContact carrier
2424th
Teilsystemsubsystem
26; 2826; 28
KontaktstückContact piece
30; 3230; 32
StromanschlußPower connection
3434
KontaktarmContact arm
3636
AnschlußleiterConnecting conductor
3838
Schraubescrew
4040
DurchgangsbohrungThrough hole
4242
KontaktarmstreifenContact arm strips
4444
SchwenkachseSwivel axis
4646
LagerstelleDepository
48; 5048; 50
LagerbohrungBearing bore
5151
AnpreßfederContact spring
52; 5452; 54
HalterungsbohrungBracket hole
5656
HaltestegLanding stage
5858
HalteklotzHolding block
6060
AusformungMolding
6262
HilfsnutAuxiliary groove
6464
HaltenutHolding groove
6666
SchrägeWeird
68; 7068; 70
HaltestiftRetaining pin
7272
KontaktdruckfederContact pressure spring
7474
Absatzparagraph
7676
StützflächeSupport surface
7878
AnschlagflächeAbutment surface
8080
FlächenteilArea part
8282
AnschlagstegFootbridge

Claims (10)

Kontaktsystem für eine Strombegrenzungseinheit mit Formgehäuse, bestehend aus - einem beweglichen Kontaktarm (34) mit einem beweglichen Kontaktstück (28) einerends und einer Schwenkachse (44) anderenends, - einem mit dem Kontaktarm (34) zu verbindenden Anschlußleiter (36), der in einen ersten Stromanschluß (30) übergeht, - einem feststehenden Kontaktträger (22) mit einem feststehenden Kontaktstück (26) einerends und einem zweiten Stromanschluß (32) anderenends, vorzugsweise mit einem Teilabschnitt mit gegenüber dem Kontaktarm (34) gegenläufiger Stromrichtung, und - weiterhin bestehend aus am Kontaktarm (34) mit ihrem einen Ende gehalterten Kontaktdruckfedern (72), dadurch gekennzeichnet, daß - der Anschlußleiter (36) einstückig in eine Lagerstelle (46) übergeht, an der die Schwenkachse (44) gelagert ist und durch Anpreßkräfte eine leitende Verbindung zum Kontaktarm (34) besteht, - die Kontaktdruckfedern (72) mit ihrem anderen Ende an dem Anschlußleiter (36) gehaltert sind, - der Kontaktarm (34) sich in Richtung der Krafteinwirkung der Kontaktdruckfedern (72) nach Durchschreiten des Durchhubes mittels einer ersten Stützstelle (74, 76) am Anschlußleiter (36) abstützt, - der Kontaktarm (34) sich entgegen der Richtung der Krafteinwirkung der Kontaktdruckfedern (72) bei Erreichen des maximalen Öffnungswinkels mittels einer zweiten Stützstelle (78, 80) am Anschlußleiter (36) abstützt, - die Kontaktdruckfedern (72) mit ihrem anderen Ende an dem Anschlußleiter (36) so halterbar sind, daß im Zuge der Montage eine geringere Kraft als im endgültig montierten Zustand wirkt. Contact system for a current limiting unit with molded housing, consisting of a movable contact arm (34) with a movable contact piece (28) at one end and a pivot axis (44) at the other end, - A connecting conductor (36) to be connected to the contact arm (34), which leads into a first power connection (30), - A fixed contact carrier (22) with a fixed contact piece (26) at one end and a second power connection (32) at the other end, preferably with a partial section with the flow direction opposite to the contact arm (34), and - further consisting of contact pressure springs (72) held on one end of the contact arm (34), characterized in that - The connecting conductor (36) merges in one piece into a bearing point (46) on which the swivel axis (44) is mounted and a contact to the contact arm (34) is provided by contact forces, - The contact pressure springs (72) are held at their other end on the connecting conductor (36), - The contact arm (34) is supported in the direction of the force of the contact pressure springs (72) after passing through the stroke by means of a first support point (74, 76) on the connecting conductor (36), - The contact arm (34) is supported against the direction of the force of the contact pressure springs (72) when the maximum opening angle is reached by means of a second support point (78, 80) on the connecting conductor (36), - The contact pressure springs (72) can be held at their other end on the connecting conductor (36) in such a way that a lower force acts in the course of assembly than in the finally assembled state. Kontaktsystem nach Anspruch 1, dadurch gekennzeichnet, daß - schraubenförmige und beidseitig neben dem Kontaktarm (34) angeordnete, auf Zug beanspruchte Kontaktdruckfedern (72) vorgesehen sind, die an zwei quer zur Krafteinwirkung angeordneten Haltestiften (68; 70) angreifen, wobei der erste Haltestift (68) im Kontaktarm (34) gehaltert ist und sich die durch die Angriffspunkte der Kontaktdruckfedern (72) gebildete Ebene zwischen dem Kontaktträger (22) und der Schwenkachse (44) befindet, - ein Halteklotz (58) aus Isolierstoff wenigstens kraftschlüssig unter der Krafteinwirkung der Kontaktdruckfedern (72) an dem Anschlußleiter (36) gehaltert ist und eine Haltenut (64) zur kraftschlüssigen Endhalterung des zweiten Haltestiftes (70) aufweist, - an dem Halteklotz (58) eine Hilfsnut (62) zur kraftschlüssigen Zwischenhalterung des zweiten Haltestiftes (70) vorgesehen ist, wobei die Hilfsnut (62) bezüglich des Kontaktträgers (22) vor der Haltenut (64) angeordnet und mit dieser durch eine Schräge (66) verbunden ist. Contact system according to claim 1, characterized in that - Helical and on both sides next to the contact arm (34) arranged, tensile contact pressure springs (72) are provided, which engage two holding pins (68; 70) arranged transversely to the action of force, the first holding pin (68) being held in the contact arm (34) and the plane formed by the contact points of the contact pressure springs (72) is between the contact carrier (22) and the pivot axis (44), - A holding block (58) made of insulating material is held at least non-positively under the force of the contact pressure springs (72) on the connecting conductor (36) and has a holding groove (64) for the non-positively holding the second retaining pin (70), - An auxiliary groove (62) is provided on the holding block (58) for the nonpositive intermediate holding of the second holding pin (70), the auxiliary groove (62) being arranged in front of the holding groove (64) with respect to the contact carrier (22) and with this by an incline ( 66) is connected. Kontaktsystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kontaktarm (34) aus zueinander spiegelbildlichen Kontaktarmstreifen (42) besteht, die einander beabstandet die Lagerstelle (46) beidseitig umfassen.Contact system according to Claim 1 or 2 , characterized in that the contact arm (34) consists of contact arm strips (42) which are mirror images of one another and which, spaced apart, enclose the bearing point (46) on both sides. Kontaktsystem nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß an der Schwenkachse (44) eine Anpreßfeder (51) für den Anpreßdruck gehaltert ist.Contact system according to one of the preceding claims, characterized in that a contact spring (51) for the contact pressure is held on the pivot axis (44). Kontaktsystem nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß der Anschlußleiter (36) einstückig in einen vom beweglichen Kontaktstück (28) abgewandten prismatischen Haltesteg (56) übergeht, auf dem der Halteklotz (58) mittels einer entsprechenden prismatischen Ausformung (60) aufsitzt.Contact system according to one of claims 2 to 4, characterized in that the connecting conductor (36) merges in one piece into a prismatic holding web (56) facing away from the movable contact piece (28), on which the holding block (58) by means of a corresponding prismatic formation (60) sits on. Kontaktsystem nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die erste Stützstelle (74, 76) im wesentlichen zwischen der Schwenkachse (44) und den endgehalterten Angriffspunkten der Kontaktdruckfedern (72) angeordnet ist.Contact system according to one of the preceding claims, characterized in that the first support point (74, 76) is arranged essentially between the pivot axis (44) and the end-held engagement points of the contact pressure springs (72). Kontaktsystem nach Anspruch 3 und 6, dadurch gekennzeichnet, daß die erste Stützstelle (74, 76) aus zu beiden Seiten des Anschlußleiters (36) ausgebildeten Absätzen (74) und dagegen abstützbaren stirnseitigen Stützflächen (76) der Kontaktarmstreifen (42) besteht.Contact system according to claims 3 and 6, characterized in that the first support point (74, 76) consists of shoulders (74) formed on both sides of the connecting conductor (36) and end faces (76) of the contact arm strips (42) which can be supported against them. Kontaktsystem nach Anspruch 5 und 7, dadurch gekennzeichnet, daß die Absätze (74) durch den Übergang der Lagerstelle (46) in den dieser gegenüber verdickten Haltesteg (56) gebildet werden.Contact system according to Claims 5 and 7, characterized in that the shoulders (74) are formed by the transition of the bearing point (46) into the retaining web (56) which is thickened relative to it. Kontaktsystem nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die zweite Stützstelle (78, 80) aus einer entsprechend dem maximalen Öffnungswinkel des Kontaktsystems (12) geneigten Anschlagfläche (78), die stirnseitig an einem einstückig vom Anschlußleiter (36) ausgehenden Anschlagsteg (82) ausgebildet ist, und dagegen abstützbaren, vom beweglichen Kontaktstück (28) abgewandten Flächenteilen (80) des Kontaktarmes (34) besteht.Contact system according to one of the preceding claims, characterized in that the second support point (78, 80) comprises a stop surface (78) which is inclined in accordance with the maximum opening angle of the contact system (12) and which has a stop web (82) which extends in one piece from the connecting conductor (36) ) is formed, and on the other hand there is supportable surface parts (80) of the contact arm (34) facing away from the movable contact piece (28). Kontaktsystem nach einem der Ansprüche 2 bis 9, dadurch gekennzeichnet, daß an dem Halteklotz (58) symmetrisch zur Haltenut (64) zwei gleichartige, mit dieser durch Schrägen (66) verbundene Hilfsnuten (62) ausgebildet sind und der Halteklotz (58) im übrigen bezüglich seiner Längsachse symmetrisch ist.Contact system according to one of claims 2 to 9, characterized in that two similar auxiliary grooves (62) connected to the retaining groove (64) are formed on the retaining block (58) symmetrically to the retaining groove (64) and the retaining block (58) in the rest is symmetrical with respect to its longitudinal axis.
EP94114680A 1993-10-11 1994-09-17 Contact system for a current limiting unit Expired - Lifetime EP0647958B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4334577 1993-10-11
DE4334577A DE4334577C1 (en) 1993-10-11 1993-10-11 Contact system for a current limiting unit

Publications (2)

Publication Number Publication Date
EP0647958A1 true EP0647958A1 (en) 1995-04-12
EP0647958B1 EP0647958B1 (en) 1996-11-27

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Country Status (5)

Country Link
US (1) US5510761A (en)
EP (1) EP0647958B1 (en)
AT (1) ATE145760T1 (en)
DE (2) DE4334577C1 (en)
ES (1) ES2096393T3 (en)

Cited By (2)

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EP2302657A1 (en) 2009-09-23 2011-03-30 ABB Schweiz AG Current limiting system
EP2555217A1 (en) 2011-08-02 2013-02-06 Abb Ag Electricity limiting system

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EP0647958B1 (en) 1996-11-27
ATE145760T1 (en) 1996-12-15
DE4334577C1 (en) 1995-03-30
DE59401149D1 (en) 1997-01-09
US5510761A (en) 1996-04-23
ES2096393T3 (en) 1997-03-01

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