EP0671054B1 - Magnetic trigger for fault current protection switch - Google Patents

Magnetic trigger for fault current protection switch Download PDF

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Publication number
EP0671054B1
EP0671054B1 EP93920752A EP93920752A EP0671054B1 EP 0671054 B1 EP0671054 B1 EP 0671054B1 EP 93920752 A EP93920752 A EP 93920752A EP 93920752 A EP93920752 A EP 93920752A EP 0671054 B1 EP0671054 B1 EP 0671054B1
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EP
European Patent Office
Prior art keywords
bearing
permanent magnet
magnetic
core
magnet
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EP93920752A
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German (de)
French (fr)
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EP0671054A1 (en
Inventor
Sönke KAHL
Wolfgang Neumann
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Felten and Guilleaume Energietechnik AG
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Felten and Guilleaume Energietechnik AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/32—Electromagnetic mechanisms having permanently magnetised part
    • H01H71/321—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements
    • H01H71/323—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements with rotatable armature

Definitions

  • the invention relates to a magnetic release for residual current circuit breakers according to the preamble of claim 1.
  • Residual current circuit breakers are used in electrical devices or systems to detect fault currents that occur as a result of a malfunction or a defect, i.e. currents flowing to earth and representing a source of danger, and to switch off the electrical circuit. All lines of the electrical device or system connected to the network are routed via a current transformer which determines the sum of all the currents flowing in and out of the line system. In a trouble-free system, this sum is zero. However, if a part of the mains current flows through a faulty connection to earth as a result of a fault, the sum of the currents flowing in and out through the current transformer becomes non-zero, as a result of which a magnetic field and a current are generated in the secondary winding of the current transformer. As a result, this current causes a current to flow in the coil of the magnetic release of the residual current circuit breaker.
  • Such a magnetic release is described in EPA 0 228 345 A1.
  • This has a magnetic yoke with a coupling point for a permanent magnetic field, a core for a trip coil, support and pole faces; has a permanent magnet arranged at the coupling point, a release coil arranged on the core, a hinged armature made of a highly permeable alloy and a plunger which can be actuated by it.
  • the magnetic yoke consists of two yoke sheets, which are separated from one another by a magnetically poorly conductive diaphragm and are made of a highly permeable alloy, each with a molded-on support for the storage of the hinged anchor educated.
  • the design of the magnetic yoke is formed at one end by a coupling point for the permanent magnet which is formed on each of the two yoke plates and at the other by a pole face, one of which is located on the free end face of the yoke plate formed as the core for the tripping coil and the other on the not in the coil protruding yoke plate is arranged.
  • the hinged anchor is pivotally mounted on the molded supports on the magnetic table and is in contact with the pole faces. A spring engaging the hinged armature loads it in the direction pointing away from the pole faces around the pivot axis.
  • the trip coil carries the current generated in the secondary winding of a summation current transformer, which is generated there as a result of a fault.
  • the current in the trip coil as a result of a fault weakens the magnetic flux of the permanent magnet, making the magnetic force less than the spring force acting on the armature, the armature tears off the pole faces and actuates the plunger, which opens the contacts of the residual current circuit breaker.
  • the magnetic release is complex due to the magnetic yoke consisting of several parts, relatively large and has the disadvantage that the magnetic energy available through the permanent magnet is not fully used.
  • the invention has for its object to provide a magnetic release for residual current circuit breaker, which is relatively simple in construction, has small dimensions and in which the maximum magnetic energy is used.
  • the advantage of the invention is that the magnetic yoke consists of only one part, which considerably simplifies the construction of the magnetic release, and that it forms the magnetic yoke, which on the one hand essentially completely envelops the permanent magnet and on the other hand has two pole faces for the armature, which generate a holding torque, allows the magnetic release to be concentrated in the smallest space and to make maximum use of the magnetic energy of the permanent magnet.
  • the magnetic yoke represents a defined magnetic shunt for the magnet.
  • the design of the bearing as a cutting bearing according to claim 2 is a little agile and low-friction type of storage for the hinged anchor.
  • a height-adjustable arrangement of the permanent magnet according to claim 8 allows a simple way to regulate the magnetic energy that can be fed.
  • a magnetic yoke 1 is shown as a stamped and bent part with a hook-shaped shape in its projection (also Fig. 2 and 3).
  • this magnetic yoke 1 has a core 3 arranged on a leg 2 for a tripping coil 4 (FIGS. 2, 4), and on the other hand it is an almost complete and thus also two-pole sheath 5 for a permanent magnet 6 - a coupling area for the permanent magnetic flux - trained (Fig. 2, 3).
  • a two-part bearing surface 7 and two pole faces 8 and 9 are formed on the magnet yoke 1 , the bearing surface 7 on one side of the permanent magnet 6 on the sheathing 5 and the pole faces 8 and 9 on the other side of the permanent magnet 6 the sheath 5 (pole face 9 ) or on the core 3 (pole face 8 ).
  • a plate 19 with a contact surface 10 and two lateral locking surfaces 11 is arranged on the support surface 7 , the surfaces 7 and 10 which are at right angles to one another forming a groove and representing a cutting bearing 12 .
  • the locking surfaces 11 close the throat and limit the cutting bearing 12 on both sides.
  • FIG. 1 further shows a plate-shaped hinged anchor 13 with a shape that corresponds approximately to the extent of the projection of the magnetic yoke 1 .
  • a cutting edge 14 is formed on the narrow side on the bearing side, which is located above the contact surface 7 of the magnetic yoke 1 (FIG. 1).
  • an engagement lever 15 for a tension spring 16 (FIG. 4) is arranged on the top of the hinged armature 13 .
  • Fig. 4 shows a magnetic release according to the invention in a schematic representation.
  • the arrangement of the hinged anchor 13 can be seen there . This rests on the two pole faces 8 and 9 in a contact-locking manner, the cutting edge 14 of which rests in the throat of the cutting bearing 12 .
  • the other end of the tension spring 16 is articulated on the attack lever 15 .
  • the illustration shows the arrangement of the permanent magnet 6 in the magnetic yoke 1 .
  • FIG. 3 shows the magnetic flux given as a result of the coupling of the permanent magnetic field into the magnetic yoke 1 .
  • the magnetic lines of force attract the hinged armature, which is mounted with its cutting edge 14 in the cutting bearing 12 , over both pole faces ( 8 , 9 ) against the force of the spring 16 until it rests on the pole faces 8 and 9 , whereby both poles contribute to the holding torque.
  • the design of the magnetic yoke 1 in particular also by the presence of a bearing (12) separate from the pole surfaces 8 and 9 guiding the magnetic flux and having a bearing surface 7 , which in the present embodiment is divided into two, prevents part of the magnetic flux from being in the area of the bearing is guided through the hinged anchor.
  • the integrated in the magnet yoke 1 permanent magnet 6 generates in the magnetic yoke 1 a magnetic flux between the two poles (8, 9) flows through the hinged armature 13 and this and pulls due to the magnetic force at the pole faces 8.
  • the magnetic energy of the permanent magnet 6 is used to the maximum and by the position of the two pole surfaces 8 and 9 to the bearing surface 7 optimal for generating a holding torque used.
  • the strength of the acting magnetic field and thus also the sensitivity of the magnetic release can be predetermined by the permanent magnet 6 and can also be changed by its height shift in the magnetic yoke 1 .
  • the state shown in FIG. 4 shows that the holding torque acting through the magnetic flux on the hinged armature 13 is greater than the counteracting torque determined by the force of the tension spring 16 and the engagement lever 15 .
  • a current generated as a result of a fault in the secondary winding of the associated current transformer also flows in the trip coil 4 and in turn generates a magnetic field in the core 3 which affects the magnetic field predetermined by the permanent magnet 6 and weakens such that the force of the tension spring acting on the hinged armature 13 16 becomes greater than the magnetic holding torque, so that the hinged armature 13 tears off the pole faces 8 and 9 and is pivoted away (folded away) about the cutting edge 14 from these pole faces.
  • the plunger 17 is actuated, that is pressed upwards, and in turn opens the contacts of the residual current circuit breaker.

Abstract

The invention relates to a magnetic trigger for a fault current protection switch with a spring-loaded cut-out blade, a permanent magnet, a triggering coil, a magnet yoke with a core for the triggering coil, a bearing and pole faces for the cut-out blade and a push-rod actuatable thereby. It solves the problem of designing such a magnetic trigger in such a way that it is simple to construct, compact and where the available magnetic energy is most effectively used. According to the invention, the magnet yoke (1) is, in projection, a hooked component which virtually completely surrounds both poles of the permanent magnet (6) at one end and at the other is shaped into a leg (2) leading away from the permanent magnet (6), the core (3) for the triggering coil (4) is arranged on the side of this leg (2) away from the projection plane and that one pole face (8) is formed on the core (3) and the other (9) between the core (3) and the permanent magnet (6) at the end of the region (5) of the magnet yoke (1) surrounding it and the bearing (12) on the side of the permanent magnet (6) away from the pole faces (8, 9) are formed on the surrounding region (5) of the magnet yoke (1).

Description

Die Erfindung betrifft einen Magnetauslöser für Fehlerstromschutzschalter nach dem Oberbegriff des Anspruchs 1.The invention relates to a magnetic release for residual current circuit breakers according to the preamble of claim 1.

Fehlerstromschutzschalter werden in Elektrogeräten oder -anlagen eingesetzt, um infolge einer Störung oder eines Defektes auftretende Fehlerströme, also zur Erde abfließende und eine Gefahrenquelle darstellende Ströme, zu erkennen und den elektrischen Stromkreis abzuschalten. Alle mit dem Netz verbundenen Leitungen des Elektrogerätes oder der -anlage werden über einen Stromwandler geführt, der die Summe aller in dem Leitungssystem zu- und abfließenden Ströme ermittelt. In einem störungsfreien System ist diese Summe Null. Wenn jedoch infolge einer Störung ein Teil des Netzstromes über eine Fehlverbindung zur Erde abfließt, wird die Summe der durch den Stromwandler zu- und abfließenden Ströme ungleich Null, wodurch ein magnetisches Feld und in der Sekundärwicklung des Stromwandlers ein Strom erzeugt werden. Dieser Strom bewirkt in Folge einen Stromfluß in der Spule des Magnetauslösers des Fehlerstromschutzschalters.Residual current circuit breakers are used in electrical devices or systems to detect fault currents that occur as a result of a malfunction or a defect, i.e. currents flowing to earth and representing a source of danger, and to switch off the electrical circuit. All lines of the electrical device or system connected to the network are routed via a current transformer which determines the sum of all the currents flowing in and out of the line system. In a trouble-free system, this sum is zero. However, if a part of the mains current flows through a faulty connection to earth as a result of a fault, the sum of the currents flowing in and out through the current transformer becomes non-zero, as a result of which a magnetic field and a current are generated in the secondary winding of the current transformer. As a result, this current causes a current to flow in the coil of the magnetic release of the residual current circuit breaker.

Ein solcher Magnetauslöser ist in der EPA 0 228 345 A1 beschrieben. Dieser weist ein Magnetjoch mit einer Einkopplungsstelle für ein Dauermagnetfeld, einen Kern für eine Auslösespule, Auflage- und Polflächen auf; hat einen an der Einkopplungsstelle angeordneten Dauermagneten, eine am Kern angeordnete Auslösespule, einen Klappanker aus einer hochpermeablen Legierung und einen durch diesen betätigbaren Stößel. Das Magnetjoch ist aus zwei durch ein magnetisch schlecht leitendes Diaphragma getrennt aneinanderliegenden, aus einer hochpermeablen Legierung bestehenden Jochblechen mit je einer angeformten Auflage für die Lagerung des Klappankers gebildet. Die Gestaltung des Magnetjochs ist einends durch eine an jedem der beiden Jochbleche angeformte Einkopplungsstelle für den Dauermagneten gebildet und andernends durch je eine Polfläche bestimmt, von denen sich eine an der freien Stirnseite des zum Kern für die Auslösespule ausgebildeten Jochblechs und die andere an dem nicht in die Spule hineinragenden Jochblech angeordnet ist. Der Klappanker ist an den angeformten Auflagen am Magnettisch schwenkbar gelagert und steht mit den Polflächen in kontaktschlüssigem Eingriff. Eine am Klappanker angreifende Feder belastet diesen in der von den Polflächen wegweisenden Richtung um die Schwenkachse. Im Bereich der Ankerlagerung sind eine oder mehrere magnetisch schlecht leitende Zonen ausgebildet, um zu verhindern, daß in der Nähe der Schwenkachse des Klappankers ein magnetischer Kurzschluß zwischen den beiden Jochblechen stattfindet. Die Auslösespule führt den in der Sekundärwicklung eines Summenstromwandlers erzeugten Strom, der dort infolge einer Störung erzeug wird.Such a magnetic release is described in EPA 0 228 345 A1. This has a magnetic yoke with a coupling point for a permanent magnetic field, a core for a trip coil, support and pole faces; has a permanent magnet arranged at the coupling point, a release coil arranged on the core, a hinged armature made of a highly permeable alloy and a plunger which can be actuated by it. The magnetic yoke consists of two yoke sheets, which are separated from one another by a magnetically poorly conductive diaphragm and are made of a highly permeable alloy, each with a molded-on support for the storage of the hinged anchor educated. The design of the magnetic yoke is formed at one end by a coupling point for the permanent magnet which is formed on each of the two yoke plates and at the other by a pole face, one of which is located on the free end face of the yoke plate formed as the core for the tripping coil and the other on the not in the coil protruding yoke plate is arranged. The hinged anchor is pivotally mounted on the molded supports on the magnetic table and is in contact with the pole faces. A spring engaging the hinged armature loads it in the direction pointing away from the pole faces around the pivot axis. In the area of the armature bearing, one or more magnetically poorly conductive zones are formed in order to prevent a magnetic short circuit between the two yoke plates in the vicinity of the pivot axis of the hinged armature. The trip coil carries the current generated in the secondary winding of a summation current transformer, which is generated there as a result of a fault.

Das an der Einkopplungsstelle des Magnetjochs durch den dort angeordneten Dauermagneten eingekoppelte Magnetfeld zieht über die Polflächen den Anker an, wobei der Dauermagnet so eingestellt ist, daß die magnetische Kraft größer als die entgegengesetzt wirkende Kraft der am Anker angreifenden Feder ist. Der in der Auslösespule infolge einer Störung geführte Strom schwächt den magnetischen Fluß des Dauermagneten, wodurch die magnetische Kraft kleiner als die auf den Anker wirkende Federkraft wird, der Anker reißt von den Polflächen ab und betätigt den Stößel, wodurch die Kontakte des Fehlerstromschutzschalters geöffnet werden.The magnetic field coupled in at the coupling point of the magnetic yoke by the permanent magnet arranged there attracts the armature via the pole faces, the permanent magnet being set such that the magnetic force is greater than the opposing force of the spring acting on the armature. The current in the trip coil as a result of a fault weakens the magnetic flux of the permanent magnet, making the magnetic force less than the spring force acting on the armature, the armature tears off the pole faces and actuates the plunger, which opens the contacts of the residual current circuit breaker.

Der Magnetauslöser ist durch dessen aus mehreren Teilen bestehendes Magnetjoch aufwendig, relativ groß und hat den Nachteil, daß die durch den Dauermagneten zur Verfügung stehende magnetische Energie nicht vollständig genutzt wird.The magnetic release is complex due to the magnetic yoke consisting of several parts, relatively large and has the disadvantage that the magnetic energy available through the permanent magnet is not fully used.

Der Erfindung liegt die Aufgabe zugrunde, einen Magnetauslöser für Fehlerstromschutzschalter zu schaffen, der in seinem Aufbau relativ einfach ist, kleine Abmessungen hat und bei dem die magnetische Energie maximal genutzt wird.The invention has for its object to provide a magnetic release for residual current circuit breaker, which is relatively simple in construction, has small dimensions and in which the maximum magnetic energy is used.

Diese Aufgabe wird bei einem Magnetauslöser für Fehlerstromschutzschalter nach dem Oberbegriff des Anspruchs 1 durch dessen kennzeichnende Merkmale gelöst.This object is achieved in a magnetic release for residual current circuit breakers according to the preamble of claim 1 by the characterizing features.

Der Vorteil der Erfindung besteht darin, daß das Magnetjoch aus nur einem Teil besteht, wodurch der Aufbau des Magnetauslösers wesentlich vereinfacht ist, und daß es die Ausbildung des Magnetjochs, das einerseits den Dauermagneten im wesentlichen vollständig umhüllt und andererseits zwei Polflächen für den Anker aufweist, die ein Haltemoment erzeugen, gestattet, den Magnetauslöser auf kleinsten Raum zu konzentrieren und dabei die magnetische Energie des Dauermagneten maximal auszunutzen. Das Magnetjoch stellt einen definierten magnetischen Nebenschluß für den Magneten dar.The advantage of the invention is that the magnetic yoke consists of only one part, which considerably simplifies the construction of the magnetic release, and that it forms the magnetic yoke, which on the one hand essentially completely envelops the permanent magnet and on the other hand has two pole faces for the armature, which generate a holding torque, allows the magnetic release to be concentrated in the smallest space and to make maximum use of the magnetic energy of the permanent magnet. The magnetic yoke represents a defined magnetic shunt for the magnet.

Die Ausbildung des Lagers als Schneidlager gemäß Anspruch 2 stellt eine wenig auf wendige und reibungsarme Lagerungsart für den Klappanker dar.The design of the bearing as a cutting bearing according to claim 2 is a little agile and low-friction type of storage for the hinged anchor.

Die Maßnahmen nach den Ansprüchen 4 bis 7 stellen zweckmäßige Ausgestaltungen des erfindungsgemäßen Magnetauslösers dar.The measures according to claims 4 to 7 represent expedient configurations of the magnetic release according to the invention.

Eine höhenverstellbare Anordnung des Dauermagneten nach Anspruch 8 gestattet auf einfache Weise ein Regulierung der einspeisbaren magnetischen Energie.A height-adjustable arrangement of the permanent magnet according to claim 8 allows a simple way to regulate the magnetic energy that can be fed.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispiels näher erläutert. Es zeigen schematisch:

Fig. 1
eine perspektivische Darstellung eines Magnetjochs mit Schneidlager und einen Klappanker,
Fig. 2
eine Draufsicht auf ein Magnetjoch mit Dauermagnet und Spule,
Fig. 3
eine Darstellung des Magnetflusses im Magnetjoch und
Fig. 4
eine Seitenansicht eines Magnetauslösers.
The invention is explained in more detail below using an exemplary embodiment. They show schematically:
Fig. 1
1 shows a perspective illustration of a magnetic yoke with a cutting bearing and a hinged anchor,
Fig. 2
a plan view of a magnetic yoke with permanent magnet and coil,
Fig. 3
a representation of the magnetic flux in the magnetic yoke and
Fig. 4
a side view of a magnetic trigger.

In Fig. 1 ist ein Magnetjoch 1 als Stanz-Biegeteil mit in seiner Projektion hakenförmiger Gestalt dargestellt (auch Fig. 2 und 3). Einerends weist dieses Magnetjoch 1 einen an einem Schenkel 2 angeordneten Kern 3 für eine Auslösespule 4 auf (Fig. 2, 4), und andererseits ist es zu einer nahezu vollständigen und damit auch beidpoligen Umhüllung 5 für einen Dauermagneten 6 - einem Einkopplungsbereich für den Dauermagnetfluß - ausgebildet (Fig. 2, 3). In einer im Abstand zur Projektionsebene befindlichen Ebene sind am Magnetjoch 1 eine zweigeteilte Auflagefläche 7 und zwei Polflächen 8 und 9 ausgebildet, wobei die Auflagefläche 7 auf der einen Seite des Dauermagneten 6 an der Umhüllung 5 und die Polflächen 8 und 9 jenseits des Dauermagneten 6 an der Umhüllung 5 (Polfläche 9) bzw. am Kern 3 (Polfläche 8) ausgebildet sind. An der Auflagefläche 7 ist ein Blech 19 mit einer Anlagefläche 10 und zwei seitlichen Arretierungsflächen 11 angeordnet, wobei die rechtwinklig zueinander gelegenen Flächen 7 und 10 eine Kehle bilden und ein Schneidlager 12 darstellen. Die Arretierungsflächen 11 verschließen die Kehle und begrenzen das Schneidlager 12 nach beiden Seiten.In Fig. 1, a magnetic yoke 1 is shown as a stamped and bent part with a hook-shaped shape in its projection (also Fig. 2 and 3). On the one hand, this magnetic yoke 1 has a core 3 arranged on a leg 2 for a tripping coil 4 (FIGS. 2, 4), and on the other hand it is an almost complete and thus also two-pole sheath 5 for a permanent magnet 6 - a coupling area for the permanent magnetic flux - trained (Fig. 2, 3). In a plane at a distance from the projection plane, a two-part bearing surface 7 and two pole faces 8 and 9 are formed on the magnet yoke 1 , the bearing surface 7 on one side of the permanent magnet 6 on the sheathing 5 and the pole faces 8 and 9 on the other side of the permanent magnet 6 the sheath 5 (pole face 9 ) or on the core 3 (pole face 8 ). A plate 19 with a contact surface 10 and two lateral locking surfaces 11 is arranged on the support surface 7 , the surfaces 7 and 10 which are at right angles to one another forming a groove and representing a cutting bearing 12 . The locking surfaces 11 close the throat and limit the cutting bearing 12 on both sides.

Fig. 1 zeigt des weiteren einen plättchenförmigen Klappanker 13 mit einer Gestalt, die etwa dem Umfang der Projektion des Magnetjochs 1 entspricht. An der lagerseitigen Schmalseite, die über der Auflagefläche 7 des Magnetjochs 1 befindlich ist (Fig. 1), ist eine Schneidkante 14 ausgebildet. An der Oberseite des Klappankers 13 ist ein Angriffshebel 15 für eine Zugfeder 16 (Fig. 4) angeordnet.1 further shows a plate-shaped hinged anchor 13 with a shape that corresponds approximately to the extent of the projection of the magnetic yoke 1 . A cutting edge 14 is formed on the narrow side on the bearing side, which is located above the contact surface 7 of the magnetic yoke 1 (FIG. 1). On the top of the hinged armature 13 , an engagement lever 15 for a tension spring 16 (FIG. 4) is arranged.

Fig. 4 zeigt einen erfindungsgemäßen Magnetauslöser in schematischer Darstellung. Dort ist die Anordnung des Klappankers 13 erkennbar. Dieser liegt kontaktschlüssig auf den beiden Polflächen 8 und 9 auf, wobei dessen Schneidkante 14 in der Kehle des Schneidlagers 12 anliegt. Am Angriffshebel 15 ist die andernends fest verankerte Zugfeder 16 angelenkt. Außerdem läßt die Darstellung die Anordnung des Dauermagneten 6 im Magnetjoch 1 erkennen.Fig. 4 shows a magnetic release according to the invention in a schematic representation. The arrangement of the hinged anchor 13 can be seen there . This rests on the two pole faces 8 and 9 in a contact-locking manner, the cutting edge 14 of which rests in the throat of the cutting bearing 12 . The other end of the tension spring 16 is articulated on the attack lever 15 . In addition, the illustration shows the arrangement of the permanent magnet 6 in the magnetic yoke 1 .

In Fig. 3 ist der infolge der Einkopplung des Dauermagnetfeldes in das Magnetjoch 1 gegebene Magnetfluß dargestellt. Die magnetischen Kraftlinien ziehen den mit seiner Schneidkante 14 im Schneidlager 12 gelagerten Klappanker über beide Polflächen (8, 9) gegen die Kraft der Feder 16 bis zur kontaktschlüssigen Auflage auf den Polflächen 8 und 9 an, wobei beide Pole zum Haltemoment beitragen. Durch die Gestaltung des Magnetjochs 1, insbesondere auch durch das Vorhandensein eines von den den magnetischen Fluß führenden Polflächen 8 und 9 getrennten Lagers (12) mit einer Auflagefläche 7, die bei vorliegender Ausführungsform zweigeteilt ist, wird verhindert, daß ein Teil des Magnetflusses im Bereich des Lagers durch den Klappanker geführt wird. D.h., der in das Magnetjoch 1 eingebundene Dauermagnet 6 erzeugt im Magnetjoch 1 einen magnetischen Fluß, der zwischen den beiden Polen (8, 9) über den Klappanker 13 fließt und diesen infolge der magnetischen Kraft an die Polflächen 8 und 9 zieht. Dadurch, daß der Dauermagnet 6 an seinen beiden Polen vom Magnetjoch 1 umgeben ist und die Auflagefläche 7 keine Polfläche ist, wird die magnetische Energie des Dauermagneten 6 maximal ausgenutzt und durch die Lage der beiden Polflächen 8 und 9 zur Auflagefläche 7 optimal zur Erzeugung eines Haltemomentes verwendet. Die Stärke des wirkenden Magnetfeldes und damit auch die Empfindlichkeit des Magnetauslösers ist durch den Dauermagneten 6 vorbestimmbar und überdies durch dessen Höhenverschiebung im Magnetjoch 1 veränderbar. Der in Fig. 4 dargestellte Zustand zeigt, daß das durch den Magnetfluß am Klappanker 13 wirkende Haltemoment größer als das diesem entgegenwirkende, durch die Kraft der Zugfeder 16 und den Angriffshebel 15 bestimmte Zugmoment ist.3 shows the magnetic flux given as a result of the coupling of the permanent magnetic field into the magnetic yoke 1 . The magnetic lines of force attract the hinged armature, which is mounted with its cutting edge 14 in the cutting bearing 12 , over both pole faces ( 8 , 9 ) against the force of the spring 16 until it rests on the pole faces 8 and 9 , whereby both poles contribute to the holding torque. The design of the magnetic yoke 1 , in particular also by the presence of a bearing (12) separate from the pole surfaces 8 and 9 guiding the magnetic flux and having a bearing surface 7 , which in the present embodiment is divided into two, prevents part of the magnetic flux from being in the area of the bearing is guided through the hinged anchor. That is, the integrated in the magnet yoke 1 permanent magnet 6 generates in the magnetic yoke 1 a magnetic flux between the two poles (8, 9) flows through the hinged armature 13 and this and pulls due to the magnetic force at the pole faces 8. 9 Characterized in that the permanent magnet 6 is surrounded by the magnetic yoke 1 at its two poles and the bearing surface 7 is not a pole surface, the magnetic energy of the permanent magnet 6 is used to the maximum and by the position of the two pole surfaces 8 and 9 to the bearing surface 7 optimal for generating a holding torque used. The strength of the acting magnetic field and thus also the sensitivity of the magnetic release can be predetermined by the permanent magnet 6 and can also be changed by its height shift in the magnetic yoke 1 . The state shown in FIG. 4 shows that the holding torque acting through the magnetic flux on the hinged armature 13 is greater than the counteracting torque determined by the force of the tension spring 16 and the engagement lever 15 .

Ein infolge einer Störung in der Sekundärwicklung des zugehörigen Stromwandlers erzeugter Strom fließt auch in der Auslösespule 4 und erzeugt seinerseits im Kern 3 ein Magnetfeld, das das durch den Dauermagneten 6 vorbestimmte Magnetfeld beeinträchtigt und derart schwächt, daß die auf den Klappanker 13 wirkende Kraft der Zugfeder 16 größer als das magnetische Haltemoment wird, so daß der Klappanker 13 von den Polflächen 8 und 9 abreißt und um die Schneidkante 14 von diesen Polflächen weggeschwenkt (weggeklappt) wird. Dabei wird der Stößel 17 betätigt, also nach oben gedrückt, und öffnet seinerseits die Kontakte des Fehlerstromschutzschalters.A current generated as a result of a fault in the secondary winding of the associated current transformer also flows in the trip coil 4 and in turn generates a magnetic field in the core 3 which affects the magnetic field predetermined by the permanent magnet 6 and weakens such that the force of the tension spring acting on the hinged armature 13 16 becomes greater than the magnetic holding torque, so that the hinged armature 13 tears off the pole faces 8 and 9 and is pivoted away (folded away) about the cutting edge 14 from these pole faces. The plunger 17 is actuated, that is pressed upwards, and in turn opens the contacts of the residual current circuit breaker.

Claims (8)

  1. Magnetic release for an earth fault current circuit breaker with a hinged armature (13) aligned by means of a spring (16), a permanent magnes (6), release coil (4), a magnet frame (1) with core for the release coil, a bearing (7,10) and pole surfaces (8,9) for the hinged armature (13) and with a tappet (17) which can be activated by the latter, with the magnet frame (1) and the hinged armature (13) consisting of a highly permeable alloy, characterized in that the magnet frame (1) is a bent component shaped in its projection like a hook, which at one end sheaths the permanent magnet (6) at both poles and almost completely and at the other end is formed into a limb (2) leading away from the permanent magnet (6), characterized in that the core (3) for the release coil (4) is situated on this limb (2) on the side pointing away from the projection plane, and characterized in that a pole surface (8) is formed at the core (3) and a pole surface (9) is formed between the core (3) and the permanent magnet (6) at the end of this sheathing area (5) of the magnet frame (1) and the bearing (12) is formed on the side of the permanent magnet (6) turned away from the pole surfaces (8, 9) at the sheathing area (5) of the magnet frame (1).
  2. Magnetic release as claimed in Claim 1, characterized in that the bearing (12) takes the form of a knife bearing.
  3. Magnetic release as claimed in Claim 2, characterized in that the knife bearing displays a bearing surface (7) divided in two and a rest surface (10) set essentially vertical to the preceding and forming a throat with it for the hinged armature (13).
  4. Magnetic release as claimed in Claim 3, characterized in that check elements (11) are situated on both sides of the throat.
  5. Magnetic release as claimed in Claims 1 and 3, characterized in that the pole surfaces (8, 9) and the bearing surface (7) are situated in one plane.
  6. Magnetic release as claimed in Claims 1 and 3, characterized in that the hinged armature (13) is a lamina with a shape corresponding approximately to the extent of projection of the magnet frame (1), displaying a knife edge (14) on its bearing side and on its upper side an attachment lug (15) for a tension spring (16).
  7. Magnetic release as claimed in Claims 1, 3, 5 and 6, characterized in that the hinged armature (13) is aligned with the knife edge (14) by the force of a tension spring (16) so as to be settled in the throat and so as to be capable of being swivelled around the knife edge (14) between two positions, of which one is established when contact is held with the pole surfaces (8, 9) and the other by the switch setting of a tappet (17) located at the side of the hinged armature (13) turned away from the pole surfaces (8, 9) and operated by this armature.
  8. Magnetic release as claimed in Claim 1, characterized in that the permanent magnet (6) is adjustable in height within the magnet frame (1).
EP93920752A 1992-11-28 1993-09-17 Magnetic trigger for fault current protection switch Expired - Lifetime EP0671054B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4240031A DE4240031A1 (en) 1992-11-28 1992-11-28 Magnetic release for residual current circuit breakers
DE4240031 1992-11-28
PCT/EP1993/002518 WO1994013003A1 (en) 1992-11-28 1993-09-17 Magnetic trigger for fault current protection switch

Publications (2)

Publication Number Publication Date
EP0671054A1 EP0671054A1 (en) 1995-09-13
EP0671054B1 true EP0671054B1 (en) 1996-04-17

Family

ID=6473879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93920752A Expired - Lifetime EP0671054B1 (en) 1992-11-28 1993-09-17 Magnetic trigger for fault current protection switch

Country Status (6)

Country Link
EP (1) EP0671054B1 (en)
AT (1) ATE137059T1 (en)
DE (2) DE4240031A1 (en)
FI (1) FI952570A (en)
NO (1) NO950024D0 (en)
WO (1) WO1994013003A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2107935B1 (en) * 1994-09-12 1998-10-01 Saez M Luisa Delgado IMPROVEMENTS INTRODUCED IN THE MANUFACTURE OF RELAYS.
DE19820768A1 (en) * 1998-05-08 1999-11-11 Siemens Ag Holder magnet trigger device for protection switch gear, esp. for fault current circuit breaker
NL1010974C2 (en) * 1999-01-06 2000-07-07 Holec Holland Nv Trip system for an electric switch with favorable power-way characteristic.
DE10117340C1 (en) * 2001-04-06 2002-10-10 Siemens Ag Electromagnetic trigger relay has blade joint formed on pole face outer edge directly by edge of holding element mounted flat on underside of armature and guide plate on core outer side
DE102017123202B4 (en) * 2017-10-06 2019-08-14 Abb Schweiz Ag Switchgear with a hinged armature magnet system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2589623B1 (en) * 1985-10-31 1989-12-22 Itt Composants Instr ELECTROMAGNETIC RELAY
ES2011457B3 (en) * 1985-12-13 1990-01-16 Cmc Carl Maier + Cie Ag MAGNET DISCONNECT FOR DEFECT CURRENT PROTECTION SWITCHES
FR2596577B1 (en) * 1986-03-28 1993-04-30 Serd Soc Et Realisa Disjonct POLARIZED TRIGGER

Also Published As

Publication number Publication date
FI952570A0 (en) 1995-05-26
WO1994013003A1 (en) 1994-06-09
NO950024L (en) 1995-01-04
DE4240031A1 (en) 1994-06-01
EP0671054A1 (en) 1995-09-13
FI952570A (en) 1995-05-26
DE59302296D1 (en) 1996-05-23
ATE137059T1 (en) 1996-05-15
NO950024D0 (en) 1995-01-04

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