EP0309383A1 - Electromagnetic trip device for a low-voltage circuit breaker - Google Patents

Electromagnetic trip device for a low-voltage circuit breaker Download PDF

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Publication number
EP0309383A1
EP0309383A1 EP88730202A EP88730202A EP0309383A1 EP 0309383 A1 EP0309383 A1 EP 0309383A1 EP 88730202 A EP88730202 A EP 88730202A EP 88730202 A EP88730202 A EP 88730202A EP 0309383 A1 EP0309383 A1 EP 0309383A1
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EP
European Patent Office
Prior art keywords
coil
switching device
low
circuit breaker
conductor
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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
EP88730202A
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German (de)
French (fr)
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EP0309383B1 (en
Inventor
Martin Dipl.-Ing. Böttcher
Karl-Heinz Dipl.-Ing. Manthe
Bernhard Dr.-Ing. Pfeiffer
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Siemens AG
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Siemens 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
    • H01H71/2481—Electromagnetic mechanisms characterised by the coil design
    • 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
    • H01H71/2472—Electromagnetic mechanisms with rotatable armatures

Definitions

  • the invention relates to an electromagnetic release of a low-voltage switching device with a magnetizable core and a coil enclosing it with at least one turn as part of the current path of the switching device.
  • Electromagnetic releases of this type are known in a number of different embodiments.
  • the design of the winding formed by the conductor depends on the rated current and the related short-circuit current at which the switching device is to be triggered. It has been found that the electromagnetic triggers for switching devices with a higher nominal current can often have a simpler design than the triggers for switching devices with a lower nominal current. This is due to the fact that, with a sufficiently high current, it is sufficient to provide an elongated conductor with, for example, a U-shaped iron yoke in order to obtain a force sufficient to solve the mechanical latching of the switching device by means of a hinged armature opposite the pole faces of the yoke. With a low short-circuit current, on the other hand, it is necessary to insert coils with several turns into the current paths of the switching device in order to generate the same or a similarly large force for tripping.
  • the invention is based on the issue of simplifying the electromagnetic release to such an extent that the use of a winding machine is unnecessary.
  • the conductor is a multi-wire insulated conductor and in that the turns are arranged in an enveloping body which forms a radial support.
  • Such conductors which are generally referred to as strands, have the property of low flexural rigidity and can therefore be wrapped around a core or bobbin with little effort, both manually and mechanically, to form a coil.
  • a coil which is formed from a flexible conductor, will generally have a lower mechanical strength than the electrodynamic stress to be expected due to short-circuit currents, unless a significant pretension is used during winding. The occurring radially outward forces can, however, be easily absorbed by the enveloping body. This ensures that neither the coil itself nor adjacent components of the switching device can be damaged.
  • the enveloping body can be formed by a recess in a carrier of the trigger of the switching device. In this case, radial support is created by inserting the coil into the recess.
  • the enveloping body can be designed as a separate protective tube. This embodiment is particularly suitable in the event that the electromagnet of the trigger is pre-assembled Assembly to be installed in a switching device.
  • Figure 1 shows a section through a low-voltage circuit breaker in a compact design (MCCB) with an electromagnetic release.
  • MCCB compact design
  • FIGS 2 and 3 show examples of coils which are intended for use in electromagnetic triggers.
  • FIG. 4 shows in detail a section through a conductor which is provided for forming the coil of an electromagnet.
  • a lower housing part 2 and an upper housing part 3 are shown as part of a low-voltage circuit breaker 1.
  • the lower housing part 2 contains the current path of the circuit breaker 1, which, starting from a connecting device 4, comprises the following parts: Fixed switching piece 5, movable switching lever 6, flexible current band 7, clamping piece 10, electromagnet 11, connecting bracket 12 and connecting device 13.
  • the electromagnet 11 is an integral part of a trigger designated as a whole by 8.
  • the electromagnet 11 interacts with a hinged armature 14, which is pivotally mounted in a cutting-like manner in a recess 15 and cooperates with a release shaft 16 at its free end.
  • the trigger shaft 16 influences in a known manner the latching of a key switch, which has been omitted in FIG. 1 to simplify the drawing.
  • Latchable switch locks are known in numerous designs, so that in the present context thereof can be disregarded to present and explain details of such a switch lock.
  • the electromagnet 11 has a U-shaped iron core 20 with pole faces 21 with which the hinged armature 14 interacts.
  • a coil 22 which is formed from several turns of an insulated stranded wire.
  • An additional core insulation 23 can be provided between the turns of the coil 22 and the iron core 20.
  • the coil 22 is formed by a portion of a flexible, insulated conductor of suitable length immediately, i.e.. H. by hand or by means of an appropriate manipulator or robot, around the iron core 20.
  • This process can be carried out easily without an otherwise usual winding machine, because the stranded wire has only a low bending stiffness and the windings can thus be applied tightly against the iron core 20 and in succession.
  • It is essential here that the subsequent parts of the current path of the circuit breaker 1 can already be connected to the stranded conductor. In the example shown, it is therefore possible to start with the manufacture of the coil 22 from an assembly which comprises a stranded conductor of suitable length and further parts connected to it at the ends, in particular the clamping piece 10 and the connection bracket 12.
  • the electromagnet 11 obtains sufficient strength against the electrodynamic stress caused by short-circuit currents through its installation in a suitable recess 25 of an insulating body 26, which is designed as a carrier of the electromagnetic release of the circuit breaker 1.
  • the Carrier 26 can be mounted as a block in the lower housing part 2. But it is also possible to design the circuit breaker 1 so that the recess 25 is provided in the lower housing part 2 itself.
  • the recess 25 is closed off by a closure piece 27, so that good protection against damage to the coil 22 is also ensured here.
  • the coil 30 shown in FIG. 2 likewise consists of an insulated, flexible stranded conductor which is wound onto a coil former 31.
  • a central opening 32 of the coil former 31 serves to receive an iron core.
  • the coil 30 is supported in the radial direction by an enveloping body in the form of a tube section 33 which is adapted in diameter.
  • the direction in which the tube section 33 is pushed over the coil 30 is indicated by an arrow 34 in FIG.
  • the tube section 33 is provided with a recess 35 on its front face.
  • the pipe section 33 can consist, for example, of an insulating material.
  • an electromagnet After inserting an iron core into the opening 32 of the coil former 31 and attaching pole pieces, an electromagnet is thus created which can interact with a hinged armature in the same way as the electromagnet 11 shown in FIG.
  • a pipe section 33 made of insulating material one made of magnetizable material, in particular a soft magnetic iron sheet, then, likewise after inserting an iron core into the opening 32, the one end of this iron core in connection with an end face of the pipe section 33 as a pole face to be used.
  • This arrangement is suitable for linear release movements.
  • the coil 30 can be provided with a movable iron core serving as a plunger anchor in order to generate a triggering movement for a switching device.
  • electromagnets with a rectangular or square design can also be produced in this way.
  • An example of this is shown in FIG. 3, in which a tubular section 36 with a square cross section is selected to support a correspondingly shaped coil.
  • this tube section there is a web-like extension 37 with fastening holes 40.
  • a coil can also be used advantageously to form an electromagnetic release.
  • FIG. 4 shows a short section of a multi-wire insulated conductor as is suitable for the purposes of the invention.
  • the conductor 41 has a number of thin copper wires 42, as are required to produce the required conductor cross section. This ensures good flexibility despite a considerable overall cross section.
  • An insulating jacket 43 surrounds the conductors 42 and at the same time is able to perform the task of core insulation and winding insulation. As already mentioned, additional core insulation can be provided. Insulating plastics with good heat resistance are particularly suitable for the insulating jacket 43, since the coil of the electromagnetic release is part of the current path in a low-voltage circuit breaker and consequently significant heating is to be expected.
  • 1 is particularly suitable for connecting sections of the line 41 to further components of the current path of a circuit breaker in accordance with FIG. 1, in which the application of heat remains essentially limited to the welding point and there is therefore no fear of damage to the insulating jacket 43.

Abstract

It is intended to reduce the outlay required for the production of coils for electromagnetic trip devices. The coil (30) of an electromagnetic trip device (8) consists of a flexible, multi-wire conductor (cable 41), which, because of its flexibility, can be processed manually or by means of a manipulator. There is hence no requirement for the use of winding machines. In addition, components (10, 12) carrying the current path of a switching device (1) onwards can be connected to the ends of a coil conductor even before the coil (30) is wound. A sleeve body absorbs electrodynamic forces which result from short-circuit currents and stress the coil electrodynamically. Low-voltage switching device of compact construction (MCCB). <IMAGE>

Description

Die Erfindung betrifft einen elektromagnetischen Auslöser eines Niederspannungs-Schaltgerätes mit einem magnetisierbaren Kern und einer diesen mit wenigstens einer Windung umschließenden Spule als Bestandteil der Strombahn des Schaltgerätes.The invention relates to an electromagnetic release of a low-voltage switching device with a magnetizable core and a coil enclosing it with at least one turn as part of the current path of the switching device.

Elektromagnetische Auslöser dieser Art sind in einer Reihe unterschiedlicher Ausführungsformen bekannt. Die Ausgestaltung ihrer durch den Leiter gebildeten Wicklung hängt dabei von dem Nennstrom und dem hiermit in Beziehung stehenden Kurzschluß­strom ab, bei dem die Auslösung des Schaltgerätes erfolgen soll. Es hat sich erwiesen, daß die elektromagnetischen Auslöser für Schaltgeräte mit höherem Nennstrom oftmals eine einfachere Gestaltung aufweisen können als die Auslöser für Schaltgeräte mit niedrigem Nennstrom. Dies hängt damit zusammen, daß es bei ausreichend hohem Strom genügt, einen gestreckten Leiter mit einem beispielsweisem U-förmig gestalteten Eisenjoch zu ver­sehen, um mittels eines den Polflächen des Joches gegenüber­stehenden Klappanker eine zur Lösung der mechanischen Ver­klinkung des Schaltgerätes ausreichende Kraft zu gewinnen. Bei einem niedrigen Kurzschlußstrom ist es dagegen erforderlich, in die Strombahnen des Schaltgerätes Spulen mit mehreren Windungen einzufügen, um die gleiche oder ähnlich große Kraft zur Aus­lösung zu erzeugen.Electromagnetic releases of this type are known in a number of different embodiments. The design of the winding formed by the conductor depends on the rated current and the related short-circuit current at which the switching device is to be triggered. It has been found that the electromagnetic triggers for switching devices with a higher nominal current can often have a simpler design than the triggers for switching devices with a lower nominal current. This is due to the fact that, with a sufficiently high current, it is sufficient to provide an elongated conductor with, for example, a U-shaped iron yoke in order to obtain a force sufficient to solve the mechanical latching of the switching device by means of a hinged armature opposite the pole faces of the yoke. With a low short-circuit current, on the other hand, it is necessary to insert coils with several turns into the current paths of the switching device in order to generate the same or a similarly large force for tripping.

Es ist üblich, Spulen für die elektromagnetischen Auslöser der vorstehend erläuterten Art als gesonderte Bauteile herzustellen, die dann beim Zusammenbau des Schaltgerätes als Baugruppe montiert werden. Zur Herstellung der Spulen wird lackierter oder blanker Profildraht mit rechteckigem oder quadratischem Querschnitt benutzt, wie dies beispielsweise der US-A-3 402 377, US-A-4 584 545, EP-A-0 208 176 und der DE-A-28 27 677 zu ent­ nehmen ist. Die Herstellung solcher Spulen erfolgt auf Wickel­maschinen, wie man sie auch für andere Spulen der Elektrotechnik einsetzt.It is common to produce coils for the electromagnetic releases of the type described above as separate components, which are then assembled as an assembly when the switching device is assembled. Lacquered or bare profiled wire with a rectangular or square cross-section is used to produce the coils, as described, for example, in US Pat. Nos. 3,402,377, 4,584,545, EP-A-0 208 176 and DE-A-28 27 677 to ent take is. Such coils are produced on winding machines of the type used for other coils in electrical engineering.

Der Erfindung liegt die Ausfgabe zugrunde, den elektromagne­tischen Auslöser soweit zu vereinfachen, daß die Anwendung einer Wickelmaschine entbehrlich ist.The invention is based on the issue of simplifying the electromagnetic release to such an extent that the use of a winding machine is unnecessary.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß der Leiter ein mehrdrähtiger isolierter Leiter ist und daß die Windungen in einem eine radiale Abstützung bildenden Hüllkörper angeordnet sind.This object is achieved according to the invention in that the conductor is a multi-wire insulated conductor and in that the turns are arranged in an enveloping body which forms a radial support.

Solche im allgemeinen als Litze bezeichneten Leiter haben die Eigenschaft einer geringen Biegesteifigkeit und lassen sich daher sowohl von Hand als auch maschinell zur Bildung einer spule um einen Kern oder Spulenkörper mit geringem Kraftauf­wand herumlegen. Eine solche, aus einem flexiblen Leiter ge­bildete Spule wird im allgemeinen, sofern nicht eine nennens­werte Vorspannung beim Wickeln angewandt wird, eine geringere mechanische Festigkeit gegenüber der aufgrund von Kurschluß­strömen zu erwartenden elektrodynamischen Beanspruchung auf­weisen. Durch den Hüllkörper können die auftretenden, radial nach außen wirkenden Kräfte jedoch auf einfache Weise abge­fangen werden. Damit ist sichergestellt, daß weder die Spule selbst noch angrenzende Bauteile des Schaltgerätes beschädigt werden können.Such conductors, which are generally referred to as strands, have the property of low flexural rigidity and can therefore be wrapped around a core or bobbin with little effort, both manually and mechanically, to form a coil. Such a coil, which is formed from a flexible conductor, will generally have a lower mechanical strength than the electrodynamic stress to be expected due to short-circuit currents, unless a significant pretension is used during winding. The occurring radially outward forces can, however, be easily absorbed by the enveloping body. This ensures that neither the coil itself nor adjacent components of the switching device can be damaged.

Der Hüllkörper kann durch eine Ausnehmung eines Trägers des Auslösers des Schaltgerätes gebildet sein. Die radiale Ab­stützung entsteht in diesem Fall durch das Einsetzen der Spule in die Ausnehmung.The enveloping body can be formed by a recess in a carrier of the trigger of the switching device. In this case, radial support is created by inserting the coil into the recess.

Ferner kann der Hüllkörper als gesondertes Schutzrohr ausge­bildet sein. Diese Ausführungsform ist besonders für den Fall geeignet, daß der Elektromagnet des Auslösers als vormontierte Baugruppe in ein Schaltgerät eingebaut werden soll.Furthermore, the enveloping body can be designed as a separate protective tube. This embodiment is particularly suitable in the event that the electromagnet of the trigger is pre-assembled Assembly to be installed in a switching device.

Die erfindung wird im folgenden anhand der in den Figuren dar­gestellten Ausführungsbeispiele näher erläutert.The invention is explained in more detail below with reference to the exemplary embodiments shown in the figures.

Figur 1 zeigt einen Schnitt durch einen Niederspannungs-­Leistungsschalter in Kompaktbauart (MCCB) mit einem elektro­magnetischen Auslöser.Figure 1 shows a section through a low-voltage circuit breaker in a compact design (MCCB) with an electromagnetic release.

Die Figuren 2 und 3 zeigen Beispiele für Spulen, die zur Ver­wendung in elektromagnetischen Auslösern vorgesehen sind.Figures 2 and 3 show examples of coils which are intended for use in electromagnetic triggers.

Die Figur 4 zeigt als Einzelheit einen Schnitt durch einen Leiter, der zur Bildung der Spule eines Elektromagneten vorge­sehen ist.FIG. 4 shows in detail a section through a conductor which is provided for forming the coil of an electromagnet.

In der Schnittdarstellung gemäß der Figur 1 sind als Bestand­teil eines Niederspannungs-Leistungsschalters 1 ein Gehäuse­unterteil 2 und ein Gehäuseoberteil 3 gezeigt. Das Gehäuse­unterteil 2 enthält die Strombahn des Leistungsschalter 1, die ausgehend von einer Anschlußvorrichtung 4 folgende Teile um­faßt:
Feststehendes Schaltstück 5, bewegbarer Schalthebel 6, bieg­sames Stromband 7, Klemmstück 10, Elektromagnet 11, Anschluß­winkel 12 und Anschlußvorrichtung 13. Der Elektromagnet 11 ist wesentlicher Bestandteil eines als Ganzes mit 8 bezeichneten Auslösers.In the sectional view according to FIG. 1, a lower housing part 2 and an upper housing part 3 are shown as part of a low-voltage circuit breaker 1. The lower housing part 2 contains the current path of the circuit breaker 1, which, starting from a connecting device 4, comprises the following parts:
Fixed switching piece 5, movable switching lever 6, flexible current band 7, clamping piece 10, electromagnet 11, connecting bracket 12 and connecting device 13. The electromagnet 11 is an integral part of a trigger designated as a whole by 8.

Der Elektromagnet 11 wirkt mit einem Klappanker 14 zusammen, der schneidenartig in einer Vertiefung 15 schwenkbar gelagert ist und an seinem freien Ende mit einer Auslösewelle 16 zu­sammenwirkt. Die Auslösewelle 16 beeinflußt in bekannter Weise die Verklinkung eines Schaltschlosses, das zur Vereinfachung der zeichnerischen Darstellung in der Figur 1 fortgelassen ist. Verklinkbare Schaltschlösse sind in zahlreichen Aus­führungen bekannt, so daß im vorliegenden Zusammenhang davon abgesehen werden kann, Einzelheiten eines solchen Schalt­schlosses darzustellen und zu erläutern.The electromagnet 11 interacts with a hinged armature 14, which is pivotally mounted in a cutting-like manner in a recess 15 and cooperates with a release shaft 16 at its free end. The trigger shaft 16 influences in a known manner the latching of a key switch, which has been omitted in FIG. 1 to simplify the drawing. Latchable switch locks are known in numerous designs, so that in the present context thereof can be disregarded to present and explain details of such a switch lock.

Im folgenden werden Einzelheiten des Elektromagneten 11 und seiner Anordnung in dem Leistungsschalter 1 erläutert.Details of the electromagnet 11 and its arrangement in the circuit breaker 1 are explained below.

Wie die Figur 1 zeigt, besitzt der Elektromagnet 11 einen U-förmigen Eisenkern 20 mit Polflächen 21, mit denen der Klapp­anker 14 zusammenwirkt. Auf dem Eisenkern 20 befindet sich eine Spule 22, die aus mehreren Windungen einer isolierten Litzen­leitung gebildet ist. Zwischen den Windungen der Spule 22 und dem Eisenkern 20 kann eine zusätzliche Kernisolierung 23 vorgesehen sein.As FIG. 1 shows, the electromagnet 11 has a U-shaped iron core 20 with pole faces 21 with which the hinged armature 14 interacts. On the iron core 20 there is a coil 22 which is formed from several turns of an insulated stranded wire. An additional core insulation 23 can be provided between the turns of the coil 22 and the iron core 20.

Die Spule 22 ist dadurch gebildet, daß ein Abschnitt eines biegsamen, isolierten Leiters geeigneter Länge unmittelbar, d. h. von Hand oder mittels eines entsprechenden Manipulators oder Roboters, um den Eisenkern 20 herumgelegt wird. Dieser Vorgang ist ohne eine sonst übliche Wickelmaschine einfach ausführbar, weil die Litzenleitung nur eine geringe Biege­steifigkeit besitzt und somit die Windungen dicht an dem Eisenkern 20 anliegend und aufeinanderfolgend aufgebracht werden können. Hierbei ist es wesentlich, daß auch die an­schließenden Teile der Strombahn des Leistungsschalters 1 be­reits mit dem Litzenleiter in Verbindung stehen können. In dem gezeigten Beispiel kann daher bei der Herstellung der Spule 22 von einer Baugruppe ausgegangen werden, die einen Litzenleiter geeigneter Länge und mit diesem an den Enden ver­bundene weitere Teile umfaßt, insbesondere das Klemmstück 10 und den Anschlußwinkel 12.The coil 22 is formed by a portion of a flexible, insulated conductor of suitable length immediately, i.e.. H. by hand or by means of an appropriate manipulator or robot, around the iron core 20. This process can be carried out easily without an otherwise usual winding machine, because the stranded wire has only a low bending stiffness and the windings can thus be applied tightly against the iron core 20 and in succession. It is essential here that the subsequent parts of the current path of the circuit breaker 1 can already be connected to the stranded conductor. In the example shown, it is therefore possible to start with the manufacture of the coil 22 from an assembly which comprises a stranded conductor of suitable length and further parts connected to it at the ends, in particular the clamping piece 10 and the connection bracket 12.

Eine ausreichende Festigkeit gegenüber der elektrodynamischen Beanspruchung durch Kurzschlußströme erhält der Elektromagnet 11 durch seinen Einbau in eine passende Ausnehmung 25 eines Isolierkörpers 26, der als Träger des elektromagnetischen Auslösers des Leistungsschalters 1 ausgebildet ist. Der Träger 26 läßt sich als Block in dem Gehäuseunterteil 2 montieren. Es ist aber auch möglich, den Leistungsschalter 1 so auszugestalten, daß die Ausnehmung 25 in dem Gehäuseunterteil 2 selbst vorgesehen ist. Auf der dem Klappanker 14 zugewandten Seite ist die Ausnehmung 25 durch ein Verschlußstück 27 abge­schlossen, damit auch hier ein guter Schutz gegen eine Be­schädigung der Spule 22 gewährleistet ist.The electromagnet 11 obtains sufficient strength against the electrodynamic stress caused by short-circuit currents through its installation in a suitable recess 25 of an insulating body 26, which is designed as a carrier of the electromagnetic release of the circuit breaker 1. The Carrier 26 can be mounted as a block in the lower housing part 2. But it is also possible to design the circuit breaker 1 so that the recess 25 is provided in the lower housing part 2 itself. On the side facing the hinged armature 14, the recess 25 is closed off by a closure piece 27, so that good protection against damage to the coil 22 is also ensured here.

Die in der Figur 2 gezeigte Spule 30 besteht gleichfalls aus einem isolierten, biegsamen Litzenleiter, der auf einen Spulen­körper 31 aufgewickelt ist. Eine zentrale Öffnung 32 des Spulenkörpers 31 dient zur Aufnahme eines Eisenkernes. Die Spule 30 wird in radialer Richtung durch einen im Durchmesser angepaßten Hüllkörper in Gestalt eines Rohrabschnittes 33 ab­gestützt. Durch einen Pfeil 34 ist in der Figur 2 die Richtung angedeutet, in welcher der Rohrabschnitt 33 über die Spule 30 geschoben wird. Für den Durchtritt der Enden der Spule 30 ist der Rohrabschnitt 33 an seiner vorderen Stirnseite mit einer Ausnehmung 35 versehen. Der Rohrabschnitt 33 kann beispiels­weise aus einem Isoliermaterial bestehen. Nach dem Einfügen eines Eisenkernes in die Öffnung 32 des Spulenkörpers 31 und dem Anbringen von Polschuhen entsteht damit ein Elektromagnet, der in gleicher Weise wie der in der Figur 1 gezeigte Elek­tromagnet 11 mit einem Klappanker zusammenwirken kann. Wird dagegen anstelle eines aus Isolierwerkstoff bestehenden Rohr­abschnittes 33 ein solcher aus magnetisierbarem Werkstoff, insbesondere einem weichmagnetischem Eisenblech gewählt, so kann, gleichfalls nach dem Einfügen eines Eisenkernes in die Öffnung 32, das eine Ende dieses Eisenkernes in Verbindung mit einer Stirnfläche des Rohrabschnittes 33 als Polfläche benutzt werden. Diese Anordnung eignet sich für lineare Auslösebe­wegungen. Ferner kann die Spule 30 mit einem als Tauchanker dienenden bewegbaren Eisenkern versehen werden, um eine Auslösebewegung für ein Schaltgerät zu erzeugen.The coil 30 shown in FIG. 2 likewise consists of an insulated, flexible stranded conductor which is wound onto a coil former 31. A central opening 32 of the coil former 31 serves to receive an iron core. The coil 30 is supported in the radial direction by an enveloping body in the form of a tube section 33 which is adapted in diameter. The direction in which the tube section 33 is pushed over the coil 30 is indicated by an arrow 34 in FIG. For the passage of the ends of the coil 30, the tube section 33 is provided with a recess 35 on its front face. The pipe section 33 can consist, for example, of an insulating material. After inserting an iron core into the opening 32 of the coil former 31 and attaching pole pieces, an electromagnet is thus created which can interact with a hinged armature in the same way as the electromagnet 11 shown in FIG. If, on the other hand, instead of a pipe section 33 made of insulating material, one made of magnetizable material, in particular a soft magnetic iron sheet, then, likewise after inserting an iron core into the opening 32, the one end of this iron core in connection with an end face of the pipe section 33 as a pole face to be used. This arrangement is suitable for linear release movements. Furthermore, the coil 30 can be provided with a movable iron core serving as a plunger anchor in order to generate a triggering movement for a switching device.

Da es die Biegsamkeit eines isolierten Litzenleiters gestattet, auch von der Kreiszylinderform eines Wickelkernes abweichende Querschnitte dicht anliegend und fest ohne Zuhilfenahme einer Wickelmaschine zu bewickeln, können auf diese Weise auch Elektromagnete mit einer rechteckigen oder quadratischen Bau­form hergestellt werden. Ein Beispiel hierfür zeigt die Figur 3, bei dem zur Abstützung einer entsprechend geformten Spule ein Rohrabschnitt 36 mit quadratischem Querschnitt gewählt ist.Since the flexibility of an insulated stranded conductor allows cross-sections deviating from the circular cylindrical shape of a winding core to be tightly and tightly wound without the aid of a winding machine, electromagnets with a rectangular or square design can also be produced in this way. An example of this is shown in FIG. 3, in which a tubular section 36 with a square cross section is selected to support a correspondingly shaped coil.

An einem Ende dieses Rohrabschnittes befindet sich ein steg­artiger Ansatz 37 mit Befestigungslöchern 40. Auch eine solche Spule ist zur Bildung eines elektromagnetishen Auslösers vor­teilhaft einsetzbar.At one end of this tube section there is a web-like extension 37 with fastening holes 40. Such a coil can also be used advantageously to form an electromagnetic release.

In der Figur 4 ist ein kurzer Abschnitt eines mehrdrähtigen isolierten Leiters gezeigt, wie er für die Zwecke der Erfindung geeignet ist. Der Leiter 41 weist eine Anzahl dünner Kupfer­drähte 42 auf, wie sie zur Herstellung der erforderlichen Leiterquerschnittes benötigt werden. Hierdurch ist trotz eines beträchtlichen Gesamtquerschnittes eine gute Biegsamkeit ge­währleistet. Ein Isoliermantel 43 umschließt die Leiter 42 und vermag gleichzeitig die Aufgabe einer Kernisolation als auch der Windungsisolation zu erfüllen. Wie bereits erwähnt, kann jedoch eine zusätzliche Kernisolation vorgesehen sein. Für den Isoliermantel 43 eignen sich insbesondere isolierende Kunststoffe mit guter Wärmebeständigkeit, da die Spule des elektromagnetischen Auslösers in einem Niederspannungs-­Leistungsschalter Bestandteil der Strombahn ist und demzufolge mit einer nennenswerten Erwärmung zu rechnen ist. Zur Ver­bindung von Abschnitten der Leitung 41 mit weiterführenden Bauteilen der Strombahn eines Leistungsschalters entsprechend der Figur 1 eignet sich insbesondere das Preßschweißen, bei dem die Wärmeanwendung im wesentlichen auf die Schweißstelle beschränkt bleibt und deshalb eine Beschädigung des Isolier­mantels 43 nicht zu befürchten ist.FIG. 4 shows a short section of a multi-wire insulated conductor as is suitable for the purposes of the invention. The conductor 41 has a number of thin copper wires 42, as are required to produce the required conductor cross section. This ensures good flexibility despite a considerable overall cross section. An insulating jacket 43 surrounds the conductors 42 and at the same time is able to perform the task of core insulation and winding insulation. As already mentioned, additional core insulation can be provided. Insulating plastics with good heat resistance are particularly suitable for the insulating jacket 43, since the coil of the electromagnetic release is part of the current path in a low-voltage circuit breaker and consequently significant heating is to be expected. 1 is particularly suitable for connecting sections of the line 41 to further components of the current path of a circuit breaker in accordance with FIG. 1, in which the application of heat remains essentially limited to the welding point and there is therefore no fear of damage to the insulating jacket 43.

Claims (3)

1. Elektromagnetischer Auslöser (8) eines Niederspannungs-­Schaltgerätes (1) mit einem magnetisierbaren Kern (20) und einer diesen mit wenigstens einer Windung umschließenden Spule (22) als Bestandteil der Strombahn des Schaltgerätes (1), dadurch gekennzeichnet, daß der Leiter ein mehrdrähtiger isolierter Leiter (41) ist und daß die Windungen in einem eine radiale Abstützung bildenden Hüllkörper (26; 33; 36) angeordnet sind.1. Electromagnetic release (8) of a low-voltage switching device (1) with a magnetizable core (20) and a coil (22) surrounding it with at least one turn as part of the current path of the switching device (1), characterized in that the conductor is a is multi-wire insulated conductor (41) and that the windings are arranged in an enveloping body (26; 33; 36) forming a radial support. 2. Auslöser nach Anspruch 1, dadurch gekennzeichnet, daß der Hüllkörper durch eine Ausnehmung (25) eines Trägers (26) des Auslösers des Schalt­gerätes (1) gebildet ist.2. Trigger according to claim 1, characterized in that the envelope body is formed by a recess (25) of a carrier (26) of the trigger of the switching device (1). 3. Auslöser nach Anspruch 1, dadurch gekennzeichnet, daß der Hüllkörper als ge­sondertes Schutzrohr (33; 36) ausgebildet ist.3. Trigger according to claim 1, characterized in that the enveloping body is designed as a separate protective tube (33; 36).
EP88730202A 1987-09-22 1988-09-06 Electromagnetic trip device for a low-voltage circuit breaker Expired - Lifetime EP0309383B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873732256 DE3732256A1 (en) 1987-09-22 1987-09-22 ELECTROMAGNETIC TRIGGER OF A LOW VOLTAGE SWITCHGEAR
DE3732256 1987-09-22

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EP0309383A1 true EP0309383A1 (en) 1989-03-29
EP0309383B1 EP0309383B1 (en) 1993-04-28

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EP (1) EP0309383B1 (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202122A1 (en) * 1992-01-27 1993-07-29 Kloeckner Moeller Gmbh Trigger for switch devices has thermal overcurrent trigger - uses current through U=shaped bimetallic strip to generate magnetic field for quick triggering
US7091811B2 (en) * 2001-06-18 2006-08-15 Abb Ab Fixing member

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429722A (en) * 1940-07-13 1947-10-28 Westinghouse Electric Corp Circuit breaker
US3179767A (en) * 1956-06-21 1965-04-20 Wadsworth Electric Mfg Co Circuit breaker with improved electromagnetic tripping device
US3189707A (en) * 1962-04-03 1965-06-15 Fed Pacific Electric Co Coil form adapted for use in magnetictrip circuit breakers
USRE27891E (en) * 1971-07-13 1974-01-22 Davis inductor coil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429722A (en) * 1940-07-13 1947-10-28 Westinghouse Electric Corp Circuit breaker
US3179767A (en) * 1956-06-21 1965-04-20 Wadsworth Electric Mfg Co Circuit breaker with improved electromagnetic tripping device
US3189707A (en) * 1962-04-03 1965-06-15 Fed Pacific Electric Co Coil form adapted for use in magnetictrip circuit breakers
USRE27891E (en) * 1971-07-13 1974-01-22 Davis inductor coil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202122A1 (en) * 1992-01-27 1993-07-29 Kloeckner Moeller Gmbh Trigger for switch devices has thermal overcurrent trigger - uses current through U=shaped bimetallic strip to generate magnetic field for quick triggering
US7091811B2 (en) * 2001-06-18 2006-08-15 Abb Ab Fixing member

Also Published As

Publication number Publication date
DE3880604D1 (en) 1993-06-03
DE3732256A1 (en) 1989-04-06
EP0309383B1 (en) 1993-04-28

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