EP0444283A1 - Automatic cutout with an electromagnetic trip - Google Patents

Automatic cutout with an electromagnetic trip Download PDF

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Publication number
EP0444283A1
EP0444283A1 EP90124549A EP90124549A EP0444283A1 EP 0444283 A1 EP0444283 A1 EP 0444283A1 EP 90124549 A EP90124549 A EP 90124549A EP 90124549 A EP90124549 A EP 90124549A EP 0444283 A1 EP0444283 A1 EP 0444283A1
Authority
EP
European Patent Office
Prior art keywords
magnetic yoke
switch according
arc
contact point
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90124549A
Other languages
German (de)
French (fr)
Other versions
EP0444283B1 (en
Inventor
Werner Dipl.-Ing. Ostermann
Jürgen Dipl.-Ing. Orzechowski
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.)
AEG Niederspannungstechnik GmbH and Co KG
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date 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 date listed.)
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Publication date
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Publication of EP0444283A1 publication Critical patent/EP0444283A1/en
Application granted granted Critical
Publication of EP0444283B1 publication Critical patent/EP0444283B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H2071/249—Electromagnetic mechanisms with part of the magnetic circuit being in the normal current path in the circuit breaker, e.g. yoke, fixed contact and arc-runner are made out of one single conductive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/121—Protection of release mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns

Definitions

  • the invention relates to a circuit breaker with an electromagnetic trigger element designed as an impact armature system, the excitation winding of which is enclosed by a frame-shaped magnetic yoke formed from a ferromagnetic sheet-metal strip, which in turn has a one-piece horn-like fixed contact point which merges into an arc-running rail and is located below the trigger element Quenching chamber with quenching plates arranged parallel to the impact anchor system and with a movable contact device oriented perpendicular to it, to the side of the release element and in front of the front side of the quenching plate package.
  • Such a switching device is known from DE 30 31 549 A1.
  • a frame-shaped closed magnetic yoke completely surrounds the excitation winding of the tripping element.
  • the fixed contact piece running out into an arc guide plate is connected to the magnetic yoke in that these parts are punched and folded in one piece from a refined steel sheet strip.
  • the legs overlap on the side of the fixed contact piece and are additionally riveted.
  • a disadvantage of this magnetic release is the considerable additional expenditure in terms of quantity of relatively expensive material and an additional mechanical work process.
  • the invention has for its object to simplify the construction of the magnetic yoke of the tripping device in a line circuit breaker of the type mentioned and to save material and at the same time to give it an optimal design in the adjacent arcing chamber and contact area of the switch for the arc to run off the contact point quickly can and commutation of the arc on the fixed contact side can be excluded.
  • the invention is advantageous in that an inexpensive arc quenching device can be produced with a low cost of materials, which also ensures a high running speed of the switching arc in the prechamber area.
  • the arc is driven safely and quickly, particularly in the critical area in front of the quenching plates by the fixed contact piece and the arc guide rail, both of which are predominantly made of ferromagnetic material. Due to the special arrangement, the magnetic flux of the short-circuit current surrounding the arc guide rails is increased in the area of the prechamber space, and the very effective blowing that arises here ensures rapid arc discharge from the contact point. Furthermore, the proposed measures significantly reduce the tendency to re-ignition of the switch.
  • the narrow circuit breaker shown has a housing (1) formed from two housing shells (1a, 1b) and held together by a plurality of rivet bolts (1c), which accommodates a switching mechanism (2), which is only indicated, in the upper part.
  • An electromagnetic release element (3) is arranged in the central area of the housing, while the base area located underneath is predominantly designed as an extinguishing chamber (4).
  • This is largely filled with quenching plates (4a) arranged parallel to the bottom surface of the switch, which are connected to one another in a packet-like manner at a distance, and is delimited on its narrow sides by arc guiding rails (5f) or (6) flanking the quenching plates on both sides.
  • the upper arc runner (5f) is part of a magnetic yoke (5) which surrounds an excitation winding (3a) in a frame shape as an iron yoke. Iron cores of an impact anchor system are in turn within the field winding (3b) arranged, which in the event of a short-circuit current gives off the unlatching stroke of the electromagnetic release member on the plunger (3c).
  • the magnetic yoke (5) is made in one piece from a sheet metal strip and has a U-leg area with a free leg (5a), a connecting yoke (5b) and a contact-side leg (5c) above and on both end faces of the excitation winding (3a) whose leg end is seamlessly formed an ear-shaped protruding fixed contact point (5d) with a contact horn (5e) bent backwards, which ultimately merges into the upper arc running rail (5f).
  • the sections of the magnetic yoke (5a, 5b, 5c, 5f) form an almost iron-closed rectangular frame around the field winding (3a).
  • the end of the contact-side leg (5c) in the transition to the fixed contact point (5d) and the contact horn (5c), which runs obliquely in front of the front contour of the upper quenching plates, are constricted almost flush with the corner in the transition to the arc guide rail (5f), while at the opposite corner of the frame the end of the free leg (5a) strives at right angles to the free end of the arc runner (5f), but without touching it.
  • a partition wall, not shown, in the housing between the excitation winding and the arc runner (5f) ensures that, in the event of a short-circuit current under the influence of the magnetic forces, no conductive connection between the leg (5a) and the arc runner (5f) can occur. This is essential insofar as a reversal of the current direction occurs when touching this corner of the frame and thus magnetic blowing would be impeded.
  • the excitation coil (3a) is connected on the one hand to an output terminal (7) and on the other hand to the contact-side leg (5c), preferably by a welding process, so that it lies in series with the fixed contact point (5d), which is in particular due to a soldered-on contact plate (5d ') is marked.
  • a movable contact lever (8) which is only shown schematically, works on this and is connected in series with an input terminal (10) via a flexible line (8a), a thermal release (9) and a connecting line (10a).
  • the thermal release (9) in the form of a bimetal is connected in a manner not shown to one end of the arc guide rail (6) and is adjustable there.
  • the trigger member (3) in the area below the excitation winding (3a) is provided with a separating cut or longitudinal slot (5g) in the magnetic yoke, so that in addition to the opposite legs (5a, 5b , 5c) of the yoke, which is kept narrower and only in the switch center plane, there is a longitudinal web (5h) on one side, which is angled directly at the end of the contact-side leg (5c) in the direction of the free leg (5a), leaving out the contact point area and is directly at the end.
  • the actual arc runner (5f) is guided in parallel with the longitudinal web (5h) at a distance approximately parallel and can be provided with a cross-profiled bead as shown in FIGS. 1 and 2 in addition to the smooth surface shown.
  • a further modification of the subject matter of the invention, in particular at high currents, is the use of a composite material as the starting material for the Magnetic yoke (5).
  • the sheet metal strip made of an iron alloy is provided with a cladding (5 ') made of a highly conductive material, preferably copper, which can have a maximum of half the strip thickness (FIG. 5).
  • the plated outside of the sheet metal strip with a total thickness of about 1 mm is turned away from the excitation winding (3a) and is thus in a highly conductive connection with the contact point (5d) or (5d ').
  • a connecting lug (5i) is preferably bent inwards on the contact-side leg of the magnet yoke, on which one end of the winding has contact contact with the clad material side. This results in a low resistance between the field winding and the contact point, which is advantageous at higher nominal currents.
  • a similar advantageous effect results in the embodiment according to FIG. 6, in which a bridge part (5k) made of a highly conductive material is arranged between the field winding and the contact point.
  • the bridge part follows the outer contour of the magnetic yoke in the ear-shaped projecting contact area (5d) and lies there tightly on the outside, one end being connected to the excitation winding (3a), while the other end can be designed directly as a contact point.
  • This can be achieved, for example, by applying silver (5k ') to the copper base material of the bridge part, so that an additional contact plate is not required.
  • the function of the separate iron-closed magnetic yoke in the sense described at the outset remains fully intact even with this version.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Push-Button Switches (AREA)
  • Burglar Alarm Systems (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Electronic Switches (AREA)
  • Toys (AREA)
  • Electromagnets (AREA)

Abstract

In the automatic cutout having an electromagnetic trip (3) designed as an impact armature system, an energising winding (3a) is surrounded by a frame-shaped magnet yoke (5) formed by a ferromagnetic sheet-metal strip. Said yoke has an integrally arranged, horn-shaped fixed contact point (5d), which merges into an arc guide rail (5f) and interacts with a moving contact lever (8), which is arranged on the side of the trip (3) and in front of the end of an arc splitter stack (4a). In order structurally to simplify the magnet yoke (5), and to construct it in a material-saving manner, it is folded from one piece to form a frame-shaped closed iron return path surrounding the energising winding (3a). To this end, the magnet yoke (5) has a U-limbed region (5a, 5b, 5c), which is located above and on both end surfaces of the energising winding (3a) and is constructed at one limb end, together with the contact horn (5e), with a fixed contact point (5d), which is arranged without a transition and projects in the form of an ear. Connected thereto is a bent-back arc guide rail (5f) which, with the end of the free limb (5a), forms a rectangular frame corner without mutual contact, so that the shape of the magnet yoke (5), which is folded in one piece is completed. <IMAGE>

Description

Die Erfindung betrifft einen Leitungsschutzschalter mit einem als Schlagankersystem ausgeführten elektromagnetischen Auslöseorgan, dessen Erregerwicklung von einem rahmenförmigen, aus einem ferromagnetischen Blechstreifen gebildeten Magnetjoch umschlossen ist, welches seinerseits eine einstückig angeordnete, in ei ne Lichtbogenlaufschiene übergehende hornartige Festkontaktstelle aufweist, und mit einer unterhalb des Auslöseorgans befindlichen Löschkammer mit parallel zum Schlagankersystem angeordneten Löschblechen sowie mit einer senkrecht dazu orientierten, seitlich des Auslöseorgans und vor der Stirnseite des Löschblechpaketes angeordneten beweglichen Kontakteinrichtung.The invention relates to a circuit breaker with an electromagnetic trigger element designed as an impact armature system, the excitation winding of which is enclosed by a frame-shaped magnetic yoke formed from a ferromagnetic sheet-metal strip, which in turn has a one-piece horn-like fixed contact point which merges into an arc-running rail and is located below the trigger element Quenching chamber with quenching plates arranged parallel to the impact anchor system and with a movable contact device oriented perpendicular to it, to the side of the release element and in front of the front side of the quenching plate package.

Ein solches Schaltgerät ist aus der DE 30 31 549 A1 bekannt. Hierbei umgibt ein rahmenförmig geschlossenes Magnetjoch die Erregerwicklung des Auslöseorgans vollständig. Das in ein Lichtbogenleitblech auslaufende Festkontaktstück ist mit dem Magnetjoch verbunden, indem diese Teile insgesamt einstückig aus einem veredelten Stahlblechstreifen gestanzt und gefaltet sind. Um den geschlossenen Rahmen des Magnetjochs zu erhalten, überlappen sich die Schenkel auf der Seite des Festkontaktstückes und werden zusätzlich vernietet. Nachteilig bei diesem Magnetauslöser ist der erhebliche mengenmäßige Mehraufwand an relativ teurem Werkstoff sowie ein zusätzlich erforderlicher mechanischer Arbeitsvorgang.Such a switching device is known from DE 30 31 549 A1. Here, a frame-shaped closed magnetic yoke completely surrounds the excitation winding of the tripping element. The fixed contact piece running out into an arc guide plate is connected to the magnetic yoke in that these parts are punched and folded in one piece from a refined steel sheet strip. In order to maintain the closed frame of the magnetic yoke, the legs overlap on the side of the fixed contact piece and are additionally riveted. A disadvantage of this magnetic release is the considerable additional expenditure in terms of quantity of relatively expensive material and an additional mechanical work process.

Des weiteren ist aus der DE-OS 1 966 598 ein elektrischer Kleinselbstschalter bekannt, bei dem ein den Auslösemagneten umgebendes Rückschlußblech zugleich als Träger des Festkontaktstückes dient und mit einem Lichtbogenableithorn versehen ist. Letzteres befindet sich sehr weit entfernt vom Magnetjoch und ist zudem schräg zur Achsrichtung des Auslösers abgeknickt. Eine solche Löschkammer ist für Schalter mit dem heute üblichen hohen Schaltvermögen nicht geeignet.Furthermore, from DE-OS 1 966 598 an electrical miniature auto switch is known, in which a return plate surrounding the release magnet also serves as a support for the fixed contact piece and with a Arc deflector is provided. The latter is located very far from the magnetic yoke and is also bent at an angle to the axis direction of the release. Such an arcing chamber is not suitable for switches with the high switching capacity customary today.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Leitungsschutzschalter der eingangs genannten Art das Magnetjoch des Auslöseorgans konstruktiv zu vereinfachen sowie materialsparend auszubilden und ihm zugleich im angrenzenden Löschkammer- und Kontaktbereich des Schalters eine optimale Gestaltung dafür zu geben, daß der Lichtbogen von der Kontaktstelle schnell ablaufen kann und eine Kommutierung des Lichtbogens auf der Festkontaktseite auszuschließen ist.The invention has for its object to simplify the construction of the magnetic yoke of the tripping device in a line circuit breaker of the type mentioned and to save material and at the same time to give it an optimal design in the adjacent arcing chamber and contact area of the switch for the arc to run off the contact point quickly can and commutation of the arc on the fixed contact side can be excluded.

Diese Aufgabe wird durch einen Leitungsschutzschalter mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Weiterbildungen und vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by a circuit breaker with the characterizing features of claim 1. Further developments and advantageous refinements of the invention are specified in the subclaims.

Die Erfindung ist insofern vorteilhaft, als mit geringem Materialaufwand eine kostengünstige Lichtbogenlöscheinrichtung herstellbar ist, die zudem eine hohe Laufgeschwindigkeit des Schaltlichtbogens im Vorkammerbereich gewährleistet. Dabei wird der Lichtbogen besonders im kritischen Bereich vor den Löschblechen durch das Festkontaktstück und die Lichtbogenlaufschiene, die beide vorwiegend aus ferromagnetischem Material bestehen, sicher und schnell angetrieben. Aufgrund der besonderen Anordnung wird der die Lichtbogenlaufschienen umgebende magnetische Fluß des Kurzschlußstromes im Bereich des Vorkammerraumes verstärkt und die hier entstehende sehr wirksame Blasung sorgt für einen schnellen Lichtbogenablauf von der Kontaktstelle. Ferner verringern die vorgeschlagenen Maßnahmen die Rückzündungsneigung des Schalters erheblich.The invention is advantageous in that an inexpensive arc quenching device can be produced with a low cost of materials, which also ensures a high running speed of the switching arc in the prechamber area. The arc is driven safely and quickly, particularly in the critical area in front of the quenching plates by the fixed contact piece and the arc guide rail, both of which are predominantly made of ferromagnetic material. Due to the special arrangement, the magnetic flux of the short-circuit current surrounding the arc guide rails is increased in the area of the prechamber space, and the very effective blowing that arises here ensures rapid arc discharge from the contact point. Furthermore, the proposed measures significantly reduce the tendency to re-ignition of the switch.

Anhand der Zeichnung ist die Erfindung nachstehend näher erläutert.

Fig. 1
zeigt schematisch einen Leitungsschutzschalter mit im Bereich des Auslöseorgans und der Löschkammer geöffneter oberer Gehäuseschale, während in
Fig. 2
ein Schnitt durch die Löschkammer gemäß der Linie II-II der Fig. 1 wiedergegeben ist. In
Fig. 3
ist das Auslöseorgan mit einem Magnetjoch in abgewandelter Form dargestellt, wobei
Fig. 4
die zugehörige Seitenansicht zeigt.
Fig. 5
und
Fig. 6
zeigen weitere alternativ mögliche Ausführungsformen des Magnetjochs im Rahmen des Erfindungsgedankens.
The invention is explained in more detail below with the aid of the drawing.
Fig. 1
shows schematically a circuit breaker with the upper housing shell open in the area of the triggering element and the arcing chamber, while in
Fig. 2
a section through the arcing chamber is shown along the line II-II of FIG. 1. In
Fig. 3
the trigger element is shown with a magnetic yoke in a modified form, wherein
Fig. 4
the associated side view shows.
Fig. 5
and
Fig. 6
show further alternative possible embodiments of the magnetic yoke within the scope of the inventive concept.

Der gezeigte Leitungsschutzschalter in Schmalbauweise hat ein aus zwei Gehäuseschalen (1a, 1b) gebildetes, von mehreren Nietbolzen (1c) zusammengehaltenes Gehäuse (1), das im oberen Teil einen lediglich angedeuteten Schaltmechanismus (2) aufnimmt. Im mittleren Bereich des Gehäuses ist ein elektromagnetisches Auslöseorgan (3) angeordnet, während der darunter befindliche Sockelbereich überwiegend als Löschkammer (4) ausgebildet ist. Diese ist größtenteils mit parallel zur Bodenfläche des Schalters angeordneten, untereinander paketartig auf Abstand verbundenen Löschblechen (4a) ausgefüllt und mit die Löschbleche beiderseits flankierenden Lichtbogenlaufschienen (5f) bzw. (6) an ihren Schmalseiten begrenzt. Dabei ist die obere Lichtbogenlaufschiene (5f) Teil eines Magnetjochs (5), welches als Eisenrückschluß eine Erregerwicklung (3a) rahmenförmig umgibt. Innerhalb der Erregerwicklung sind wiederum Eisenkerne eines Schlagankersystems (3b) angeordnet, welches letztlich bei einem Kurzschlußstrom den Entklinkungshub des elektromagnetischen Auslöseorgans am Stößel (3c) abgibt.The narrow circuit breaker shown has a housing (1) formed from two housing shells (1a, 1b) and held together by a plurality of rivet bolts (1c), which accommodates a switching mechanism (2), which is only indicated, in the upper part. An electromagnetic release element (3) is arranged in the central area of the housing, while the base area located underneath is predominantly designed as an extinguishing chamber (4). This is largely filled with quenching plates (4a) arranged parallel to the bottom surface of the switch, which are connected to one another in a packet-like manner at a distance, and is delimited on its narrow sides by arc guiding rails (5f) or (6) flanking the quenching plates on both sides. The upper arc runner (5f) is part of a magnetic yoke (5) which surrounds an excitation winding (3a) in a frame shape as an iron yoke. Iron cores of an impact anchor system are in turn within the field winding (3b) arranged, which in the event of a short-circuit current gives off the unlatching stroke of the electromagnetic release member on the plunger (3c).

Das Magnetjoch (5) ist einstückig aus einem Blechstreifen hergestellt und hat oberhalb sowie zu beiden Stirnflächen der Erregerwicklung (3a) einen U-schenkligen Bereich mit einem freien Schenkel (5a), einem Verbindungsjoch (5b) und einem kontaktseitigen Schenkel (5c), an dessen Schenkelende übergangslos eine ohrenförmig vorstehende Festkontaktstelle (5d) mit rückwärts gebogenem Kontakthorn (5e) ausgebildet ist, welches letztlich in die obere Lichtbogenlaufschiene (5f) übergeht. Dabei bildet das Magnetjoch mit seinen Abschnitten (5a, 5b, 5c, 5f) einen nahezu eisengeschlossenen rechteckigen Rahmen um die Erregerwicklung (3a). Wie aus den Figuren ohne weiteres ersichtlich ist, sind das Ende des kontaktseitigen Schenkels (5c) im Übergang zur Festkontaktstelle (5d) und das schräg vor der Stirnkontur der oberen Löschbleche entlanggeführte Kontakthorn (5c) im Übergang zur Lichtbogenlaufschiene (5f) nahezu eckenbündig eingeschnürt, während an der gegenüberliegenden Rahmenecke das Ende des freien Schenkels (5a) rechtwinklig auf das freie Ende der Lichtbogenlaufschiene (5f) zustrebt, ohne diese jedoch zu berühren. Eine nicht dargestellte Trennwand im Gehäuse zwischen Erregerwicklung und Lichtbogenlaufschiene (5f) gewährleistet, daß bei einem Kurzschlußstrom unter dem Einfluß der magnetischen Kräfte keine leitende Verbindung zwischen Schenkel (5a) und Lichtbogenlaufschiene (5f) auftreten kann. Dies ist insofern wesentlich, als bei Berührung an dieser Rahmenecke eine Stromrichtungsumkehr auftreten und somit die magnetische Blasung behindert würde.The magnetic yoke (5) is made in one piece from a sheet metal strip and has a U-leg area with a free leg (5a), a connecting yoke (5b) and a contact-side leg (5c) above and on both end faces of the excitation winding (3a) whose leg end is seamlessly formed an ear-shaped protruding fixed contact point (5d) with a contact horn (5e) bent backwards, which ultimately merges into the upper arc running rail (5f). The sections of the magnetic yoke (5a, 5b, 5c, 5f) form an almost iron-closed rectangular frame around the field winding (3a). As can be easily seen from the figures, the end of the contact-side leg (5c) in the transition to the fixed contact point (5d) and the contact horn (5c), which runs obliquely in front of the front contour of the upper quenching plates, are constricted almost flush with the corner in the transition to the arc guide rail (5f), while at the opposite corner of the frame the end of the free leg (5a) strives at right angles to the free end of the arc runner (5f), but without touching it. A partition wall, not shown, in the housing between the excitation winding and the arc runner (5f) ensures that, in the event of a short-circuit current under the influence of the magnetic forces, no conductive connection between the leg (5a) and the arc runner (5f) can occur. This is essential insofar as a reversal of the current direction occurs when touching this corner of the frame and thus magnetic blowing would be impeded.

Ferner ist die Erregerspule (3a) einerseits mit einer Ausgangsklemme (7) und andererseits mit dem kontaktseitigen Schenkel (5c) vorzugsweise durch einen Schweißvorgang elektrisch leitend verbunden, so daß sie in Reihe mit der Festkontaktstelle (5d) liegt, die insbesondere durch ein aufgelötetes Kontaktplättchen (5d') markiert ist. Auf dieses arbeitet ein lediglich schematisch gezeigter beweglicher Kontakthebel (8), der über eine flexible Leitung (8a), einem thermischen Auslöser (9) und eine Verbindungsleitung (10a) mit einer Eingangsklemme (10) in Reihe geschaltet ist. Der thermische Auslöser (9) in Form eines Bimetalls ist in nicht näher dargestellter Weise mit dem einen Ende der Lichtbogenleitschiene (6) verbunden und dort justierbar.Furthermore, the excitation coil (3a) is connected on the one hand to an output terminal (7) and on the other hand to the contact-side leg (5c), preferably by a welding process, so that it lies in series with the fixed contact point (5d), which is in particular due to a soldered-on contact plate (5d ') is marked. A movable contact lever (8), which is only shown schematically, works on this and is connected in series with an input terminal (10) via a flexible line (8a), a thermal release (9) and a connecting line (10a). The thermal release (9) in the form of a bimetal is connected in a manner not shown to one end of the arc guide rail (6) and is adjustable there.

In der bevorzugten Ausführungsart sind die beiden Lichtbogenlaufschienen (5f, 6) mit einer längs verlaufenden, quer profilierten Sicke (5f', 6') (Fig. 1, Fig. 2) versehen, die in Richtung der Löschbleche (4) vorstehend etwa in der Mitte jeder Lichtbogenlaufschiene, d. h. etwa in der Schwenkebene des beweglichen Kontakthebels (8) eingeprägt sind. Die Sicke an der oberen Lichtbogenlaufschiene (5f) beginnt dabei direkt unterhalb des Kontaktplättchens (5d') und schließt vorzugsweise höhenbündig damit ab. So ist sichergestellt, daß bei einem Abschaltvorgang der unter der Wirkung des magnetischen Blasfeldes von der Kontaktstelle (5d', 8') ablaufende Schaltlichtbogen mit seinen Fußpunkten auf der Sicke entlangläuft und eine gute Führung in den Löschblechstapel erfährt, wobei zusätzliche Maßnahmen eine seitliche Begrenzung des Schaltlichtbogens bewirken.In the preferred embodiment, the two arc guide rails (5f, 6) are provided with a longitudinally running, transversely profiled bead (5f ', 6') (Fig. 1, Fig. 2) which protrudes approximately in the direction of the quenching plates (4) the center of each arc runner, d. H. are impressed approximately in the pivoting plane of the movable contact lever (8). The bead on the upper arc runner (5f) begins directly below the contact plate (5d ') and preferably ends flush with it. This ensures that during a switch-off process, the switching arc running under the action of the magnetic blowing field from the contact point (5d ', 8') runs with its base points on the bead and is well guided in the stack of fire-extinguishing sheets, additional measures limiting the side of the Cause switching arc.

Gleiches gilt für den gegenüberliegenden Fußpunkt des Schaltlichtbogens, der vom sich öffnenden Kontakthebel (8) unter der Wirkung des magnetischen Blasfeldes auf die untere ferromagnetische Lichtbogenlaufschiene (6) überspringt und dort entlang der Sicke (6') in das Löschblechpaket einlaufen kann. Hierbei wird der Lichtbogen im kritischen Bereich des Vorkammerraumes und vor den Löschblechen (4a) sicher und wirksam angetrieben, da aufgrund des einstückigen Magnetjochs im vorwiegend aus ferromagnetischem Material bestehenden Kontaktbereich (5d, 5e) und im Übergang zur oberen Lichtbogenlaufschiene (5f) der diese Teile umgebende magnetische Fluß verstärkt wird. Ein schneller Lichtbogenablauf von den Kontakthörnern entlang der beiden Lichtbogenlaufschienen in das Löschblechpaket ist damit gewährleistet, ohne daß es zu Rückzündungen an der Kontaktstelle kommt.The same applies to the opposite base point of the switching arc, that of the opening contact lever (8) under the effect of the magnetic Blows field jumps onto the lower ferromagnetic arc rail (6) and can run there along the bead (6 ') into the quenching plate package. The arc is safely and effectively driven in the critical area of the prechamber area and in front of the quenching plates (4a), because of the one-piece magnetic yoke in the contact area (5d, 5e), which consists mainly of ferromagnetic material, and in the transition to the upper arc runner (5f) of these parts surrounding magnetic flux is amplified. A rapid arc discharge from the contact horns along the two arc guide rails into the quenching plate package is thus ensured without backfiring at the contact point.

In einer abgewandelten Ausführungsart (Fig. 3, Fig. 4) ist das Auslöseorgan (3) im Bereich unterhalb der Erregerwicklung (3a) mit einem Trennschnitt oder Längsschlitz (5g) im Magnetjoch versehen, so daß neben der gegenüber den Schenkeln (5a, 5b, 5c) des Joches schmaler gehaltenen, nur in der Schaltermittelebene befindlichen Lichtbogenlaufschiene (5f) einseitig ein Längssteg (5h) verbleibt, der unmittelbar am Ende des kontaktseitigen Schenkels (5c) unter Auslassung des Kontaktstellenbereiches in Richtung des freien Schenkels (5a) abgewinkelt ist und an dessen Ende direkt anliegt. Dadurch ist ein vollständig geschlossener Eisenrahmen um die Erregerwicklung realisiert. Die eigentliche Lichtbogenlaufschiene (5f) ist neben dem Längssteg (5h) mit Abstand etwa parallel geführt und kann außer der gezeigten glattflächigen Ausbildung auch mit einer querprofilierten Sicke gemäß Fig. 1 und 2 versehen sein.In a modified embodiment (Fig. 3, Fig. 4), the trigger member (3) in the area below the excitation winding (3a) is provided with a separating cut or longitudinal slot (5g) in the magnetic yoke, so that in addition to the opposite legs (5a, 5b , 5c) of the yoke, which is kept narrower and only in the switch center plane, there is a longitudinal web (5h) on one side, which is angled directly at the end of the contact-side leg (5c) in the direction of the free leg (5a), leaving out the contact point area and is directly at the end. This creates a completely closed iron frame around the excitation winding. The actual arc runner (5f) is guided in parallel with the longitudinal web (5h) at a distance approximately parallel and can be provided with a cross-profiled bead as shown in FIGS. 1 and 2 in addition to the smooth surface shown.

Eine weitere Abwandlung des Erfindungsgegenstandes, insbesondere bei hohen Stromstärken, ist die Verwendung eines Verbundwerkstoffes als Ausgangsmaterial für das Magnetjoch (5). Hierbei ist der Blechstreifen aus einer Eisenlegierung mit einer Plattierung (5') aus gut leitendem Material, vorzugsweise Kupfer, versehen, der maximal die halbe Streifendicke haben kann (Fig. 5). Die plattierte Außenseite des Blechstreifens mit einer Gesamtdicke von etwa 1 mm ist der Erregerwicklung (3a) abgekehrt und befindet sich so in gut leitender Verbindung mit der Kontaktstelle (5d) bzw. (5d'). Um auch die Erregerwicklung fertigungsgünstig direkt mit dem plattierten Werkstoff zu verbinden, ist vorzugsweise am kontaktseitigen Schenkel des Magnetjochs eine Anschlußfahne (5i) nach innen gebogen, an der das eine Wicklungsende mit der plattierten Werkstoffseite Kontaktberührung hat. Zwischen Erregerwicklung und Kontaktstelle ergibt sich so ein geringer Widerstand, was bei höheren Nennströmen vorteilhaft ist.A further modification of the subject matter of the invention, in particular at high currents, is the use of a composite material as the starting material for the Magnetic yoke (5). Here, the sheet metal strip made of an iron alloy is provided with a cladding (5 ') made of a highly conductive material, preferably copper, which can have a maximum of half the strip thickness (FIG. 5). The plated outside of the sheet metal strip with a total thickness of about 1 mm is turned away from the excitation winding (3a) and is thus in a highly conductive connection with the contact point (5d) or (5d '). In order to connect the excitation winding directly to the clad material, which is favorable for production, a connecting lug (5i) is preferably bent inwards on the contact-side leg of the magnet yoke, on which one end of the winding has contact contact with the clad material side. This results in a low resistance between the field winding and the contact point, which is advantageous at higher nominal currents.

Eine ähnlich vorteilhafte Wirkung ergibt sich bei der Ausführungsart nach Fig. 6, bei der ein Brückenteil (5k) aus gut leitendem Werkstoff zwischen der Erregerwicklung und der Kontaktstelle angeordnet ist. Das Brückenteil folgt der Außenkontur des Magnetjochs im ohrenförmig vorstehenden Kontaktstellenbereich (5d) und liegt dort außenseitig dicht an, wobei ein Ende mit der Erregerwicklung (3a) verbunden ist, während das andere Ende direkt als Kontaktstelle ausgebildet sein kann. Dies läßt sich beispielsweise durch einen Silberauftrag (5k') auf dem Kupfergrundwerkstoff des Brückenteils realisieren, so daß ein zusätzliches Kontaktplättchen entfällt. Die Funktion des separaten eisengeschlossenen Magnetjochs im eingangs beschriebenen Sinne bleibt auch bei dieser Ausführung voll erhalten.A similar advantageous effect results in the embodiment according to FIG. 6, in which a bridge part (5k) made of a highly conductive material is arranged between the field winding and the contact point. The bridge part follows the outer contour of the magnetic yoke in the ear-shaped projecting contact area (5d) and lies there tightly on the outside, one end being connected to the excitation winding (3a), while the other end can be designed directly as a contact point. This can be achieved, for example, by applying silver (5k ') to the copper base material of the bridge part, so that an additional contact plate is not required. The function of the separate iron-closed magnetic yoke in the sense described at the outset remains fully intact even with this version.

Claims (10)

Leitungsschutzschalter mit einem als Schlagankersystem ausgeführten elektromagnetischen Auslöseorgan, dessen Erregerwicklung von einem rahmenförmigen, aus einem ferromagnetischen Blechstreifen gebildeten Magnetjoch umschlossen ist, welches seinerseits eine einstückig angeordnete, in eine Lichtbogenlaufschiene übergehende hornartige Festkontaktstelle aufweist, und mit einer unterhalb des Auslöseorgans befindlichen Löschkammer mit parallel zum Schlagankersystem angeordneten Löschblechen sowie mit einer dazu senkrecht orientierten, seitlich des Auslöseorgans und vor der Stirnseite des Löschblechpaketes angeordneten beweglichen Kontakteinrichtung, dadurch gekennzeichnet, daß das Magnetjoch (5), ausgehend von einem oberhalb und zu beiden Stirnflächen der Erregerwicklung (3a) befindlichen U-schenkligen Bereich (5a, 5b, 5c), an einem Schenkelende mit übergangslos angeordneter, ohrenförmig vorstehender Festkontaktstelle (5d) nebst Kontakthorn (5e) ausgebildet und mittels der daran anschließenden, rückgebogenen Lichtbogenlaufschiene (5f) zu einem die Erregerwicklung (3a) umgebenden rahmenförmig geschlossenen Eisenrückschluß einstückig gefaltet ist.Miniature circuit breaker with an electromagnetic release element designed as a striking armature system, the excitation winding of which is enclosed by a frame-shaped magnetic yoke formed from a ferromagnetic sheet metal strip, which in turn has a one-piece horn-like fixed contact point which merges into an arc running rail, and with an arcing chamber located below the triggering element and parallel to the striking element system arranged quenching plates as well as with a movable contact device vertically oriented to the side of the triggering element and in front of the end face of the quenching plate stack, characterized in that the magnetic yoke (5), starting from a U-leg area located above and to both end faces of the excitation winding (3a) (5a, 5b, 5c), formed at one end of the leg with a seamlessly arranged, protruding fixed contact point (5d) together with contact horn (5e) and by means of the dara n subsequent, bent-back arc runner (5f) is folded in one piece into a frame-shaped closed iron yoke surrounding the field winding (3a). Schalter nach Anspruch 1, dadurch gekennzeichnet, daß das der Festkontaktstelle (5d) abgekehrte freie Schenkelende (5a) des Magnetjochs (5) und das freie Ende der Lichtbogenlaufschiene (5f) rechtwinklig aufeinanderstoßend ohne gegenseitige Berührung als Rahmenecke ausgebildet sind.Switch according to Claim 1, characterized in that the free leg end (5a) of the magnetic yoke (5) facing away from the fixed contact point (5d) and the free end of the arc guide rail (5f) are formed as a frame corner butting one another at right angles without mutual contact. Schalter nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das freie Ende der Lichtbogenlaufschiene (5f) über den freien Schenkel (5a) des Magnetjochs (5) hinaus und mit Abstand zu dessen Schenkelende freistehend verlängert ist.Switch according to claims 1 and 2, characterized in that the free end of the arc guide rail (5f) is extended free-standing beyond the free leg (5a) of the magnetic yoke (5) and at a distance from its leg end. Schalter nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die Lichtbogenlaufschiene (5f) und das Kontakthorn (5e) in Längsrichtung mit einer querprofilierten Sicke (5f') versehen sind.Switch according to Claims 1 to 3, characterized in that the arc running rail (5f) and the contact horn (5e) are provided in the longitudinal direction with a cross-profiled bead (5f '). Schalter nach Anspruch 4, dadurch gekennzeichnet, daß die Sicke (5f') etwa in Schwenkebene der beweglichen Kontakteinrichtung (8) angeordnet und in Richtung der Löschbleche (4a) vorstehend eingeprägt ist.Switch according to Claim 4, characterized in that the bead (5f ') is arranged approximately in the pivoting plane of the movable contact device (8) and is embossed above in the direction of the quenching plates (4a). Schalter nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Sicke (5f') direkt unterhalb eines Kontaktplättchens (5d') der Festkontaktstelle beginnend mit deren kontaktseitiger Fläche höhenbündig ausgebildet ist.Switch according to Claim 4 or 5, characterized in that the bead (5f ') is formed flush with the height, starting directly below the contact plate (5d') of the fixed contact point, with its surface on the contact side. Schalter nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß an der Lichtbogenlaufschiene (5f) mittels eines Trennschlitzes (5g) in Achsrichtung der Erregerwicklung (3a) ein etwa parallel verlaufender Längssteg (5h) gebildet ist, der vom kontaktseitigen Schenkel (5c) des U-förmigen Magnetjochs (5) unter Auslassung der Festkontaktstelle (5d) und des Lichtbogenhorns (5e) unmittelbar als geschlossener Eisenrahmen um die Erregerwicklung (3a) gebogen ist.Switch according to one of claims 1 to 6, characterized in that an approximately parallel longitudinal web (5h) is formed on the arc guide rail (5f) by means of a separating slot (5g) in the axial direction of the excitation winding (3a) and is formed by the leg (5c) on the contact side. of the U-shaped magnetic yoke (5), omitting the fixed contact point (5d) and the arcing horn (5e), is bent directly as a closed iron frame around the excitation winding (3a). Schalter nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Magnetjoch (5) aus einem ferromagnetischen Blechstreifen mit einseitiger Plattierung (5') eines gut leitenden Werkstoffes hergestellt ist, wobei die ferromagnetische Werkstoffseite der Erregerwicklung (3a) zugekehrt ist.Switch according to one of Claims 1 to 7, characterized in that the magnetic yoke (5) is produced from a ferromagnetic sheet metal strip with one-sided cladding (5 ') of a highly conductive material, the ferromagnetic material side facing the excitation winding (3a). Schalter nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß am kontaktseitigen Schenkel (5c) des Magnetjochs (5) eine in Richtung der Lichtbogenlaufschiene (5f) gebogene Anschlußfahne (5i) zur direkten elektrisch leitenden Verbindung der Plattierung (5') mit dem Draht der Erregerwicklung (3a) ausgebildet ist.Switch according to one of claims 1 to 8, characterized in that on the contact-side leg (5c) of the magnetic yoke (5) a connecting lug (5i) bent in the direction of the arc running rail (5f) is formed for the direct electrically conductive connection of the plating (5 ') to the wire of the excitation winding (3a). Schalter nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Festkontaktstelle (5d) und das dieser zugekehrte Ende der Erregerwicklung (3a) mittels eines auf dem ferromagnetischen Werkstoff des Magnetjochs (5) aufliegenden Brückenteils (5k) leitend verbunden ist.Switch according to one of Claims 1 to 8, characterized in that the fixed contact point (5d) and the end of the excitation winding (3a) facing it are conductively connected by means of a bridge part (5k) resting on the ferromagnetic material of the magnetic yoke (5).
EP90124549A 1990-02-24 1990-12-18 Automatic cutout with an electromagnetic trip Expired - Lifetime EP0444283B1 (en)

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DE9002197U 1990-02-24
DE9002197U DE9002197U1 (en) 1990-02-24 1990-02-24 Circuit breaker with an electromagnetic release device

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EP0444283B1 EP0444283B1 (en) 1994-10-26

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AT (1) ATE113409T1 (en)
DE (2) DE9002197U1 (en)
ES (1) ES2063236T3 (en)
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CN104241055A (en) * 2013-06-05 2014-12-24 松下电器产业株式会社 Circuit breaker
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GB2286486A (en) * 1994-02-10 1995-08-16 Matsushita Electric Works Ltd Circuit breaker
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WO2002075764A1 (en) * 2001-03-20 2002-09-26 Moeller Gebäudeautomation KG Yoke comprising a single-element fixed contact carrier
EP1388154B1 (en) * 2001-05-15 2011-01-19 Eaton Corporation Electrical switching apparatus having an arc runner with an elongated raised ridge
WO2002099829A1 (en) * 2001-06-01 2002-12-12 Siemens Aktiengesellschaft Magnet yoke of an electromagnetic tripping device
WO2007087761A1 (en) * 2006-01-31 2007-08-09 Siemens Aktiengesellschaft Circuit breaker
CN102113079A (en) * 2008-07-31 2011-06-29 伊顿有限公司 Switching device
CN102113079B (en) * 2008-07-31 2014-05-28 伊顿有限公司 Switching device
CN104241055A (en) * 2013-06-05 2014-12-24 松下电器产业株式会社 Circuit breaker
CN105513860A (en) * 2016-01-18 2016-04-20 刘天保 Electronic and electromagnetic intelligent switch for high-voltage power systems

Also Published As

Publication number Publication date
PL164963B1 (en) 1994-10-31
NO180607B (en) 1997-02-03
EP0444283B1 (en) 1994-10-26
NO910709D0 (en) 1991-02-22
ES2063236T3 (en) 1995-01-01
ATE113409T1 (en) 1994-11-15
PL289163A1 (en) 1991-08-26
NO180607C (en) 1997-05-14
HK34795A (en) 1995-03-17
DE9002197U1 (en) 1991-06-27
DE59007565D1 (en) 1994-12-01
NO910709L (en) 1991-08-26

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