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EP0902453B1 - Device for adjusting a thermal tripping device, particularly for a circuit breaker - Google Patents

Device for adjusting a thermal tripping device, particularly for a circuit breaker Download PDF

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Publication number
EP0902453B1
EP0902453B1 EP98113767A EP98113767A EP0902453B1 EP 0902453 B1 EP0902453 B1 EP 0902453B1 EP 98113767 A EP98113767 A EP 98113767A EP 98113767 A EP98113767 A EP 98113767A EP 0902453 B1 EP0902453 B1 EP 0902453B1
Authority
EP
European Patent Office
Prior art keywords
adjusting
screw
lever
circuit breaker
release
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.)
Expired - Lifetime
Application number
EP98113767A
Other languages
German (de)
French (fr)
Other versions
EP0902453A3 (en
EP0902453A2 (en
Inventor
Rolf Dipl.-Ing. Goehle
Volker Schmitt
Klaus-Peter Dipl.-Ing. Eppe
Ralf Dipl.-Ing. Weber
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.)
ABB Patent GmbH
Original Assignee
ABB Patent 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.)
Filing date
Publication date
Application filed by ABB Patent GmbH filed Critical ABB Patent GmbH
Publication of EP0902453A2 publication Critical patent/EP0902453A2/en
Publication of EP0902453A3 publication Critical patent/EP0902453A3/en
Application granted granted Critical
Publication of EP0902453B1 publication Critical patent/EP0902453B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal 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
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H01H2071/7454—Adjusting only the electrothermal mechanism with adjustable axis of transmission lever between bimetal element and trip lever

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • Circuit breaker used to shut down a network in case of overcurrent or short-circuit current serve have a thermal for tripping in an overcurrent Trigger, which is usually designed as a bimetallic strip. Because certain tolerances it is necessary after final assembly of the circuit breaker to adjust this. This is done in most cases in that the attachment point the bimetallic strip is deformed by means of an adjusting screw or the distance between the transmission lever or the transfer slider and the bimetallic strip adjusted by means of a screw mounted in the bimetal from the outside becomes.
  • the adjustment process is not reversible, d. H. not repeatable as often as desired while maintaining the same adjustment result, because certain plastic deformations are possible. If the distance between the Bimetallic and the transmission lever or trigger element is set, then will transmit a force to the bimetal via the screw, which influences the alignment constancy can.
  • the object of the invention is to provide a device of the type mentioned, a safe and constant thermal adjustment with low mounting and testing effort and allows the reversible and any number of times with the same Adjustment result is repeatable.
  • the screw is fixed immovably and rotatably guided. It is screwed in an adjusting lever, with the transmission lever or the Transmission slide is coupled, and by turning the screw and adjusting the adjusting lever, the distance between the transmission lever and the Verklinkungsstelle be adjusted in the switch lock.
  • a circuit breaker 10 In a circuit breaker 10 is an electromagnetic release 11 and a thermal release 12 shown in the form of a bimetallic strip.
  • the electromagnetic Trigger acts on the line of action via the line of action 13 and a striking pin 13a a switching mechanism 14, and the thermal release 12, the at a Fixed at the end of 15 transmits the movement of its free end 16 a transfer slide 17 which is linearly displaceable within a guide 18 is guided, also on the Verklinkungsstelle the switching mechanism 14, see below below.
  • the switching mechanism 14 is a contact lever 19th pivoted so that a contact point 20 is opened, which is in a cable 21 between two terminals 22 and 23 is located.
  • the electromagnetic release acts directly on the striking pin 13a the contact lever 19 and thus the contact point 20 a.
  • the device for adjusting the bimetallic strip 12 comprises a screw 23, the has a recess 24, about which they rotatable in a stationary holder 25 and is guided immovably.
  • the screw performs no translational relative movement during rotation Direction of its longitudinal axis based on the fixation in the holder 25 through, but is only rotated about its longitudinal axis.
  • the threaded portion 26 of the screw 23 is in an adjusting lever 27 is screwed, one end of which is mounted stationarily at 28 and the other end 29, which here has an L-shape, with the bimetallic strip 12 interacts.
  • the bimetal 12 Due to a current flow through the conduction path 21, the bimetal 12 is heated and bends counterclockwise with its free end towards the Transfer slide 17 off. About this slider it pivots the adjusting lever, which shifts the striker and hits the Verklinkungsstelle and the switch lock 14 unlatched.

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  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

The thermal overload device for a power switch has an electromagnetic actuator (11) that is triggered by a thermal release stage. The latter is in the form of a bimetallic element (12) that moves a sliding element. The operating point is determined by a lever (27) that is moved by a screw (23) which causes the lever to displace the slide element.

Description

Die Erfindung betrifft eine Vorrichtung gemäß dem Oberbegriff des Anspruches 1.The invention relates to a device according to the preamble of claim 1.

Eine solche Vorrichtung ist aus der Offenlegungsschrift DE 3515297 bekannt.Such a device is known from the published patent application DE 3515297.

Leitungsschutzschalter, die zum Abschalten eines Netzes bei Überstrom oder Kurzschlußstrom dienen, besitzen für die Auslösung bei einem Überstrom einen thermischen Auslöser, der meistens als Thermobimetall ausgebildet ist. Da gewisse Toleranzen vorhanden sind, ist es erforderlich, nach der Endmontage des Leitungsschutzschalters diesen zu justieren. Dies erfolgt in den meisten Fällen dadurch, daß die Befestigungsstelle des Thermobimetalls mittels einer Justierschraube verformt wird bzw. der Abstand zwischen dem Übertragungshebel oder dem Übertragungsschieber und dem Thermobimetall mittels einer im Bimetall gelagerten Schraube von außen verstellt wird.Circuit breaker used to shut down a network in case of overcurrent or short-circuit current serve, have a thermal for tripping in an overcurrent Trigger, which is usually designed as a bimetallic strip. Because certain tolerances it is necessary after final assembly of the circuit breaker to adjust this. This is done in most cases in that the attachment point the bimetallic strip is deformed by means of an adjusting screw or the distance between the transmission lever or the transfer slider and the bimetallic strip adjusted by means of a screw mounted in the bimetal from the outside becomes.

Je nach Elastizität des Materials der Bimetallbefestigung ist der Justagevorgang nicht reversibel, d. h. nicht beliebig oft bei gleichbleibendem Justierergebnis wiederholbar, da gewisse plastische Verformungen möglich sind. Wenn der Abstand zwischen dem Bimetall und dem Übertragungshebel oder Auslöseelement eingestellt wird, dann wird über die Schraube eine Kraft auf das Bimetall übertragen, was die Justierkonstanz beeinflussen kann. Depending on the elasticity of the material of the Bimetallbefestigung the adjustment process is not reversible, d. H. not repeatable as often as desired while maintaining the same adjustment result, because certain plastic deformations are possible. If the distance between the Bimetallic and the transmission lever or trigger element is set, then will transmit a force to the bimetal via the screw, which influences the alignment constancy can.

Aufgabe der Erfindung ist es, eine Vorrichtung der eingangs genannten Art zu schaffen, die eine sichere und konstante thermische Justage mit geringem montage- und prüftechnischem Aufwand ermöglicht und die reversibel und beliebig oft bei gleichbleibendem Justierergebnis wiederholbar ist.The object of the invention is to provide a device of the type mentioned, a safe and constant thermal adjustment with low mounting and testing effort and allows the reversible and any number of times with the same Adjustment result is repeatable.

Diese Aufgabe wird erfindungsgemäß gelöst durch die kennzeichnenden Merkmale des Anspruches 1.This object is achieved by the characterizing features of Claim 1.

Erfindungsgemäß also ist die Schraube ortsfest unverschieblich und drehbar geführt. Sie ist in einem Justierhebel eingeschraubt, der mit dem Übertragungshebel oder dem Übertragungsschieber gekoppelt ist, und durch Verdrehen der Schraube und Verstellen des Justierhebels kann der Abstand zwischen dem Übertragungshebel und der Verklinkungsstelle im Schaltschloß einjustiert werden.According to the invention, therefore, the screw is fixed immovably and rotatably guided. It is screwed in an adjusting lever, with the transmission lever or the Transmission slide is coupled, and by turning the screw and adjusting the adjusting lever, the distance between the transmission lever and the Verklinkungsstelle be adjusted in the switch lock.

Eine elastische Verformung irgend eines mit dem Thermobimetall verbundenen Bauteiles ist nicht gegeben, so daß mittels der erfindungsgemäßen Ausführung der Justiervorgang häufig wiederholt werden kann, und zwar mit immer gleichem Ergebnis.An elastic deformation of any component connected to the bimetallic strip is not given, so that by means of the inventive embodiment of the adjustment can be repeated frequently, and always with the same result.

Weitere vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung sind den weiteren Unteransprüchen zu entnehmen.Further advantageous embodiments and improvements of the invention are the to remove further subclaims.

Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung dargestellt ist, sollen die Erfindung sowie weitere vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung näher erläutert und beschrieben werden.

  • Es zeigt die einzige Fig. eine schematische Darstellung einer erfindungsgemäßen Ausführung.
    • Reference to the drawing, in which an embodiment of the invention is shown, the invention and further advantageous embodiments and improvements of the invention will be explained and described in detail.
  • The only FIGURE is a schematic representation of an embodiment according to the invention.

    • In einem Leitungsschutzschalter 10 ist ein elektromagnetischer Auslöser 11 und ein thermischer Auslöser 12 in Form eines Thermobimetalls dargestellt. Der elektromagnetische Auslöser wirkt über die Wirklinie 13 und einen Schlagstift 13a auf die Verklinkungsstelle eines Schaltschlosses 14, und der thermische Auslöser 12, der an einem Ende 15 ortsfest eingespannt ist, überträgt die Bewegung seines freien Endes 16 über einen Übertragungsschieber 17, der innerhalb einer Führung 18 linear verschieblich geführt ist, ebenfalls auf die Verklinkungsstelle des Schaltschlosses 14, siehe weiter unten. Über diese Verklinkungsstelle des Schaltschlosses 14 wird ein Kontakthebel 19 verschwenkt, so daß eine Kontaktstelle 20 geöffnet wird, die sich in einem Leitungszug 21 zwischen zwei Anschlußklemmen 22 und 23 befindet. Zur Abschaltung eines Kurzschlusses wirkt der elektromagnetische Auslöser über den Schlagstift 13a direkt auf den Kontakthebel 19 und damit auf die Kontaktstelle 20 ein.In a circuit breaker 10 is an electromagnetic release 11 and a thermal release 12 shown in the form of a bimetallic strip. The electromagnetic Trigger acts on the line of action via the line of action 13 and a striking pin 13a a switching mechanism 14, and the thermal release 12, the at a Fixed at the end of 15 transmits the movement of its free end 16 a transfer slide 17 which is linearly displaceable within a guide 18 is guided, also on the Verklinkungsstelle the switching mechanism 14, see below below. About this Verklinkungsstelle the switching mechanism 14 is a contact lever 19th pivoted so that a contact point 20 is opened, which is in a cable 21 between two terminals 22 and 23 is located. To switch off a short circuit the electromagnetic release acts directly on the striking pin 13a the contact lever 19 and thus the contact point 20 a.

    Die Vorrichtung zur Justierung des Thermobimetalls 12 umfaßt eine Schraube 23, die eine Eindrehung 24 aufweist, über die sie in einem ortsfesten Halter 25 drehbar und unverschieblich geführt ist.The device for adjusting the bimetallic strip 12 comprises a screw 23, the has a recess 24, about which they rotatable in a stationary holder 25 and is guided immovably.

    Dadurch führt die Schraube beim Drehen keine translatorische Relativbewegung in Richtung ihrer Längsachse bezogen auf die Fixierung im Halter 25 durch, sondern wird lediglich um ihre Längsachse gedreht. Der Gewindeabschnitt 26 der Schraube 23 ist in einen Justierhebel 27 eingeschraubt, dessen eines Ende ortsfest bei 28 gelagert ist und dessen anderes Ende 29, welches hier eine L-Form besitzt, mit dem Thermobimetall 12 zusammenwirkt.As a result, the screw performs no translational relative movement during rotation Direction of its longitudinal axis based on the fixation in the holder 25 through, but is only rotated about its longitudinal axis. The threaded portion 26 of the screw 23 is in an adjusting lever 27 is screwed, one end of which is mounted stationarily at 28 and the other end 29, which here has an L-shape, with the bimetallic strip 12 interacts.

    Wenn nun justiert werden soll, dann wird mittels der Schraube 23 der Justierhebel 27 im Uhrzeigersinn um die ortsfeste Drehachse 28 verschwenkt, wodurch das freie Ende 16 des Thermobimetalls 12 mit dem Schieber 17 in Berührung gelangt. Beim Weiterdrehen der Schraube 23 verschiebt der Justierhebel 27 den Schlagstift, der auf die Verklinkungsstelle des Schaltwerkes auftrifft und dieses entklinkt. Ab diesem Zeitpunkt wird die Schraube 23 um eine bestimmte Anzahl von Umdrehungen zurückgedreht. Aufgrund des Außendurchmessers und der Steigung des Gewindes im Gewindeabschnitt 26 kann dabei zwischen der Verklinkungsstelle im Schaltschloß 14, dem Schlagstift 13a, dem Schieber 17, dem Übertragungshebel 27 und dem Thermobimetall 12 ein bestimmter Abstand erzielt werden; dieser bestimmte Abstand definiert den Vorlauf des Thermobimetalls 12 für die thermische Auslösung.If now to be adjusted, then by means of the screw 23 of the adjusting lever 27th pivoted clockwise about the stationary axis of rotation 28, whereby the free end 16 of the bimetallic strip 12 comes into contact with the slider 17. When turning further the screw 23, the adjusting lever 27 moves the striker pin, which on the Verklinkungsstelle the rear derailleur hits and this unlatches. From this point on, the Screw 23 turned back by a certain number of turns. by virtue of the outer diameter and the pitch of the thread in the threaded portion 26th can between the Verklinkungsstelle in the switching mechanism 14, the striker 13a, the slider 17, the transmission lever 27 and the bimetallic 12 a certain Distance can be achieved; this particular distance defines the flow of the Thermobimetal 12 for thermal tripping.

    Aufgrund eines Stromflusses durch den Leitungspfad 21 erwärmt sich das Bimetall 12 und biegt sich entgegen dem Uhrzeigersinn mit seinem freien Ende in Richtung zu dem Übertragungsschieber 17 aus. Über diesen Schieber verschwenkt es den Justierhebel, der den Schlagstift verschiebt und auf die Verklinkungsstelle auftrifft und das Schaltschloß 14 entklinkt.Due to a current flow through the conduction path 21, the bimetal 12 is heated and bends counterclockwise with its free end towards the Transfer slide 17 off. About this slider it pivots the adjusting lever, which shifts the striker and hits the Verklinkungsstelle and the switch lock 14 unlatched.

    Claims (1)

    1. Apparatus for adjusting a thermal release (12), having a switching mechanism (14) for the purpose of permanently opening a contact point (20) of a service switching device (10), in particular of a circuit breaker, having a screw (23) for the purpose of adjusting the thermal release (12) and a transmission lever or slide (17) for the purpose of transmitting the movement of the release (12) to the latching point of the switching mechanism (14), the screw (23) being guided such that it is fixed in position in an undisplaceable manner and can be rotated, characterized in that the screw (23) is screwed into an L-shaped adjusting lever (27) which is coupled to the transmission lever or slide (17) and to the tripping pin (13a) of an electromagnetic release (11), and in that, by rotating the screw (23) and thus by moving the adjusting lever (17), the distance between the thermal release (12) and the transmission lever or slide (17) and thus between the thermal release (12) and the latching point in the switching mechanism (14) can be adjusted.
    EP98113767A 1997-09-11 1998-07-23 Device for adjusting a thermal tripping device, particularly for a circuit breaker Expired - Lifetime EP0902453B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19739821A DE19739821A1 (en) 1997-09-11 1997-09-11 Device for adjusting a thermal release, in particular for a circuit breaker
    DE19739821 1997-09-11

    Publications (3)

    Publication Number Publication Date
    EP0902453A2 EP0902453A2 (en) 1999-03-17
    EP0902453A3 EP0902453A3 (en) 1999-11-24
    EP0902453B1 true EP0902453B1 (en) 2005-11-23

    Family

    ID=7841927

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98113767A Expired - Lifetime EP0902453B1 (en) 1997-09-11 1998-07-23 Device for adjusting a thermal tripping device, particularly for a circuit breaker

    Country Status (3)

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    EP (1) EP0902453B1 (en)
    AT (1) ATE311015T1 (en)
    DE (2) DE19739821A1 (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE19938965A1 (en) * 1999-08-17 2001-02-22 Abb Patent Gmbh Tripping device for an electrical installation switch

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR669531A (en) * 1928-02-13 1929-11-18 Schiele & Bruchsaler Ind Method and device for the calibration and adjustment of overload circuit breakers
    DE600061C (en) * 1928-02-24 1934-07-13 Schiele & Bruchsaleri Industri Calibration and setting device for thermal releases of overcurrent switches
    DE2717116C3 (en) * 1977-04-19 1981-03-26 Hundt & Weber Schaltgeräte GmbH, 57258 Freudenberg Multi-phase circuit breaker with thermal tripping
    DE3515297A1 (en) * 1985-04-27 1986-11-06 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Automatic switch with a magnetic and thermal trip device
    FR2602910A1 (en) * 1986-08-14 1988-02-19 Telemecanique Electrique DEVICE FOR ADJUSTING THE THERMAL CURRENT OF A BILAMIC THERMAL ACTUATOR AND PROTECTION SWITCH COMPRISING SUCH A DEVICE

    Also Published As

    Publication number Publication date
    DE19739821A1 (en) 1999-03-18
    EP0902453A3 (en) 1999-11-24
    DE59813214D1 (en) 2005-12-29
    EP0902453A2 (en) 1999-03-17
    ATE311015T1 (en) 2005-12-15

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