EP0650179A1 - Thermal overcurrent trip for an electrical switching device - Google Patents

Thermal overcurrent trip for an electrical switching device Download PDF

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Publication number
EP0650179A1
EP0650179A1 EP94116279A EP94116279A EP0650179A1 EP 0650179 A1 EP0650179 A1 EP 0650179A1 EP 94116279 A EP94116279 A EP 94116279A EP 94116279 A EP94116279 A EP 94116279A EP 0650179 A1 EP0650179 A1 EP 0650179A1
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EP
European Patent Office
Prior art keywords
carrier
snap disc
snap
trigger according
switching device
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.)
Withdrawn
Application number
EP94116279A
Other languages
German (de)
French (fr)
Inventor
Karl Bernauer
Gerhard Mössner
Heinz Dr. Popa
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 EP0650179A1 publication Critical patent/EP0650179A1/en
Withdrawn legal-status Critical Current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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H61/00—Electrothermal relays
    • H01H61/02—Electrothermal relays wherein the thermally-sensitive member is heated indirectly, e.g. resistively, inductively

Definitions

  • the invention relates to a thermal overcurrent release for an electrical switching device according to the preamble of claim 1.
  • a thermal release of the type mentioned is known from DE-PS 36 27 275, according to which a snap disk designed as a bimetallic metal is accommodated in a housing associated with a magnetic release and spatially and thermally coupled to it.
  • the snap disk is heated indirectly, which has the disadvantage that the time delay is very large.
  • a heat paste is provided, in particular in the practical embodiment of the subject of the cited patent specification, between the heat-generating and heat-dissipating parts, in particular between the coil former and the coil, in order to transfer heat from the coil to the coil former and thus to improve the snap disk.
  • the object of the invention is to provide a thermal release of the type mentioned, in which the problems of heat transfer are better solved.
  • the snap disk is located in the region of a carrier through which the current flows, its side, which is convexly rounded in the non-triggered operation, abutting against the carrier.
  • the carrier is a substantially flat cross member on which two L-shaped hooks are provided which cover the edges of the snap disk and hold the snap disk on the support.
  • a holding element can also be provided which covers the snap disk and, if necessary, presses against the carrier.
  • the carrier thus forms an essentially closed cavity together with the holding element.
  • the carrier can have a recess corresponding to the convex side of the snap disk, into which the snap disk lies with its convex side.
  • the carrier and / or the holding element can be designed as a heating conductor.
  • the snap disk does not only have to be circular; it can of course also be polygonal, in particular square.
  • a bimetallic snap disk 11 is placed on a carrier designed as an elongate crossmember, with its convex side 12 being directed towards the carrier.
  • Two or possibly several approximately L-shaped or hook-shaped hooks 13 and 14 are punched out of the carrier 10 and, with latches 15 and 16, encompass the edge of the snap disk 11 and hold the snap disk on the carrier.
  • the carrier is made of electrically highly conductive material and in particular of a heating conductor, so that the current I flowing through it sufficiently heats the bimetal 11 or the snap disk 11.
  • the carrier 20 has a recess 21 which has a radius R which corresponds to the radius R1 of the snap disc 11, so that when the snap disc 11 is inserted into the recess 21, the convex side 12 of the snap disc 11 touches the inner surface 22 practically completely.
  • the heat transfer from the carrier 10 to the snap disk 11 only in one due to the convexity predetermined, relatively small area
  • the heat transfer from the depression 21 via the surface 22 and the surface 12 to the snap disk 11 can take place on the entire snap disk surface 12.
  • the time delay between the increased current I through the carrier and the heating of the snap disk 11 is considerably reduced compared to the embodiment according to FIG.
  • a holder 23 which has opposite ends 24 and 25 flanges with which the holder 23 can be fastened to the carrier 20 by means of screw connections 26 and 27 or rivet connections or the like.
  • the holder also has a spherical cap-like shape like the recess 21, so that an approximately oval cavity 28 is formed between the carrier 20 in the region of the recess 21 and the holder 23, in which the snap disc 11 is located.

Landscapes

  • Thermally Actuated Switches (AREA)

Abstract

The invention relates to a thermal overcurrent trip (release) for an electrical switching device, in particular for a line protection circuit breaker, having a thermostatic bimetallic strip in the form of a snap-action disc which jumps (snaps) over from a first stable position into a second stable position in the event of a temperature increase and by means of which a drive train for permanently switching off the moving contact piece is driven, the snap-action disc (11) preferably being directed with its convex rounded side (12) against the carrier (10, 20) through which the current (I) flows. <IMAGE>

Description

Die Erfindung betrifft einen thermischen Überstromauslöser für ein elektrisches Schaltgerät nach dem Oberbegriff des Anspruches 1.The invention relates to a thermal overcurrent release for an electrical switching device according to the preamble of claim 1.

Ein thermischer Auslöser der eingangs genannten Art ist aus der DE-PS 36 27 275 bekannt geworden, nach der eine als Thermobimetall ausgebildete Schnappscheibe in einem einem magnetischen Auslöser zugeordneten und räumlich sowie thermisch damit gekuppelten Gehäuse untergebracht ist. Die Schnappscheibe wird dabei indirekt beheizt, was den Nachteil hat, daß die Zeitverzögerung sehr groß ist. Zur Übertragung der Wärme hin zur Schnappscheibe ist insbesondere in der praktischen Ausführung des Gegenstandes der genannten Patentschrift zwischen den die Wärme erzeugenden und die Wärme fortleitenden Teilen eine Wärmepaste vorgesehen, insbesondere zwischen dem Spulenkörper und der Spule, um den Wärmeübergang von der Spule zum Spulenkörper und damit zu der Schnappscheibe zu verbessern.A thermal release of the type mentioned is known from DE-PS 36 27 275, according to which a snap disk designed as a bimetallic metal is accommodated in a housing associated with a magnetic release and spatially and thermally coupled to it. The snap disk is heated indirectly, which has the disadvantage that the time delay is very large. To transfer the heat to the snap disk, a heat paste is provided, in particular in the practical embodiment of the subject of the cited patent specification, between the heat-generating and heat-dissipating parts, in particular between the coil former and the coil, in order to transfer heat from the coil to the coil former and thus to improve the snap disk.

Aufgabe der Erfindung ist es, einen thermischen Auslöser der eingangs genannten Art zu schaffen, bei dem die Probleme des Wärmeübergangs besser gelöst sind.The object of the invention is to provide a thermal release of the type mentioned, in which the problems of heat transfer are better solved.

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

Erfindungsgemäß also befindet sich die Schnappscheibe im Bereich eines vom Strom durchflossenen Trägers, wobei ihre im nicht ausgelösten Betrieb konvex gerundete Seite gegen den Träger anliegt.According to the invention, therefore, the snap disk is located in the region of a carrier through which the current flows, its side, which is convexly rounded in the non-triggered operation, abutting against the carrier.

Gemäß Anspruch 2 ist der Träger eine im wesentlichen ebene Traverse, an der zwei L-förmige Haken vorgesehen sind, die die Schnappscheibenränder überdecken und die Schnappscheibe am Träger festhalten.According to claim 2, the carrier is a substantially flat cross member on which two L-shaped hooks are provided which cover the edges of the snap disk and hold the snap disk on the support.

Anstatt derartiger L-förmiger Haken kann auch ein Halteelement vorgesehen sein, das die Schnappscheibe überdeckt und ggf. gegen den Träger drückt. Der Träger bildet somit zusammen mit dem Halteelement einen im wesentlichen geschlossenen Hohlraum.Instead of such L-shaped hooks, a holding element can also be provided which covers the snap disk and, if necessary, presses against the carrier. The carrier thus forms an essentially closed cavity together with the holding element.

Zur Verbesserung des Wärmeübergangs zwischen dem Träger und der Schnappscheibe kann der Träger eine der konvexen Seite der Schnappscheibe entsprechende Vertiefung aufweisen, in die die Schnappscheibe mit ihrer konvexen Seite einliegt.To improve the heat transfer between the carrier and the snap disk, the carrier can have a recess corresponding to the convex side of the snap disk, into which the snap disk lies with its convex side.

Zur Verbesserung der Beheizung der Schnappscheibe können der Träger und/oder das Halteelement als Heizleiter ausgebildet sein.To improve the heating of the snap disk, the carrier and / or the holding element can be designed as a heating conductor.

Die Schnappscheibe muß nicht nur kreisförmig sein; sie kann natürlich auch mehreckig, insbesondere viereckig sein.The snap disk does not only have to be circular; it can of course also be polygonal, in particular square.

Anhand der Zeichnung, in der zwei Ausführungsbeispiele der Erfindung dargestellt sind, sollen die Erfindung sowie weitere vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung näher erläutert und beschrieben werden.On the basis of the drawing, in which two exemplary embodiments of the invention are shown, the invention and further advantageous refinements and improvements of the invention are to be explained and described in more detail.

Es zeigen:

Figur 1
eine Schnittansicht durch eine erste Ausführungsform und
Figur 2
eine Schnittansicht durch eine zweite Ausführungsform der Erfindung.
Show it:
Figure 1
a sectional view through a first embodiment and
Figure 2
a sectional view through a second embodiment of the invention.

Auf einem als langgestreckte Traverse ausgebildeten Träger ist eine Bimetallschnappscheibe 11 aufgelegt und zwar mit ihrer konvexen Seite 12 zum Träger hingerichtet. Aus dem Träger 10 sind zwei oder ggf. mehrere etwa L-förmige oder hakenförmige Haken 13 und 14 herausgestanzt, die mit Rastnasen 15 und 16 den Rand der Schnappscheibe 11 umfassen und die Schnappscheibe am Träger festhalten.A bimetallic snap disk 11 is placed on a carrier designed as an elongate crossmember, with its convex side 12 being directed towards the carrier. Two or possibly several approximately L-shaped or hook-shaped hooks 13 and 14 are punched out of the carrier 10 and, with latches 15 and 16, encompass the edge of the snap disk 11 and hold the snap disk on the carrier.

Der Träger ist aus elektrisch gut leitfähigem Material und insbesondere aus einem Heizleiter hergestellt, so daß der durch ihn hindurchfließende Strom I in ausreichender Weise das Thermobimetall 11 bzw. die Schnappscheibe 11 beheizt.The carrier is made of electrically highly conductive material and in particular of a heating conductor, so that the current I flowing through it sufficiently heats the bimetal 11 or the snap disk 11.

Bei der Ausführung nach Figur 2 besitzt der Träger 20 eine Vertiefung 21, die einen Radius R aufweist, der dem Radius R₁ der Schnappscheibe 11 entspricht, so daß dann, wenn die Schnappscheibe 11 in die Vertiefung 21 eingelegt ist, die konvexe Seite 12 der Schnappscheibe 11 die Innenfläche 22 praktisch vollständig berührt. Während bei der Ausführung nach Figur 1 der Wärmeübergang vom Träger 10 auf die Schnappscheibe 11 nur in einem durch die Konvexität vorbestimmten, relativ kleinen Bereich erfolgt, kann bei der Ausführungsform nach Figur 2 der Wärmeübergang von der Vertiefung 21 über die Fläche 22 und die Fläche 12 hin zur Schnappscheibe 11 auf der gesamten Schnappscheibenfläche 12 erfolgen. Dadurch ist die Zeitverzögerung zwischen dem erhöhten Strom I durch den Träger und der Erwärmung der Schnappscheibe 11 gegenüber der Ausführung nach Figur 1 erheblich verkürzt.In the embodiment according to Figure 2, the carrier 20 has a recess 21 which has a radius R which corresponds to the radius R₁ of the snap disc 11, so that when the snap disc 11 is inserted into the recess 21, the convex side 12 of the snap disc 11 touches the inner surface 22 practically completely. While in the embodiment according to FIG. 1, the heat transfer from the carrier 10 to the snap disk 11 only in one due to the convexity predetermined, relatively small area, in the embodiment according to FIG. 2 the heat transfer from the depression 21 via the surface 22 and the surface 12 to the snap disk 11 can take place on the entire snap disk surface 12. As a result, the time delay between the increased current I through the carrier and the heating of the snap disk 11 is considerably reduced compared to the embodiment according to FIG.

Damit die Schnappscheibe 11 nicht aus ihrer Lage herausrutscht, ist ein Halter 23 vorgesehen, der an sich gegenüberliegenden Enden 24 und 25 Flansche aufweist, mit denen der Halter 23 mittels Schraubenverbindungen 26 und 27 oder Nietverbindungen oder dgl. am Träger 20 befestigt werden kann.So that the snap disc 11 does not slip out of its position, a holder 23 is provided which has opposite ends 24 and 25 flanges with which the holder 23 can be fastened to the carrier 20 by means of screw connections 26 and 27 or rivet connections or the like.

Wie aus der Figur 2 ersichtlich, besitzt der Halter ebenfalls eine kugelkalottenartige Form wie die Vertiefung 21, so daß zwischen dem Träger 20 im Bereich der Vertiefung 21 und dem Halter 23 ein etwa ovaler Hohlraum 28 gebildet ist, in dem sich die Schnappscheibe 11 befindet.As can be seen from FIG. 2, the holder also has a spherical cap-like shape like the recess 21, so that an approximately oval cavity 28 is formed between the carrier 20 in the region of the recess 21 and the holder 23, in which the snap disc 11 is located.

Claims (6)

Thermischer Überstromauslöser für ein elektrisches Schaltgerät, insbesondere für einen Leitungsschutzschalter, mit einem Thermobimetall in Form einer Schnappscheibe, die bei Temperaturerhöhung aus einer ersten stabilen Stellung in eine zweite stabile Stellung umspringt (umschnappt) und mit der ein Getriebezug zur bleibenden Ausschaltung des beweglichen Kontaktstückes angesteuert wird, dadurch gekennzeichnet, daß die Schnappscheibe (11) vorzugsweise mit ihrer konvex gerundeten Seite (12) gegen den vom Strom (I) durchflossenen Träger (10, 20) gerichtet ist.Thermal overcurrent release for an electrical switching device, in particular for a circuit breaker, with a thermal bimetal in the form of a snap disc, which jumps (snaps) when the temperature rises from a first stable position to a second one, and with which a gear train is activated to permanently switch off the movable contact piece characterized in that the snap disc (11) is preferably directed with its convexly rounded side (12) against the carrier (10, 20) through which the current (I) flows. Auslöser nach Anspruch 1, dadurch gekennzeichnet, daß der Träger (10) eine im wesentlichen ebene Traverse ist, an der wenigstens zwei sich gegenüberstehende, aufeinanderzuweisende Ausstanzungen (13, 14) in Form L-förmiger Haken angeformt sind, die die Schnappscheibenränder überdecken und die Schnappscheibe (11) am Träger (10) festhalten.Trigger according to claim 1, characterized in that the carrier (10) is an essentially flat crossmember on which at least two mutually opposing punched-out punchings (13, 14) are formed in the form of L-shaped hooks which cover the edges of the snap disc and which Hold the snap disc (11) on the carrier (10). Auslöser nach Anspruch 1, dadurch gekennzeichnet, daß am Träger (20) ein Halteelement (23) befestigt ist, das die Schnappscheibe (11) überdeckt und ggf. gegen den Träger drückt.Trigger according to Claim 1, characterized in that a holding element (23) is fastened to the carrier (20) and covers the snap disc (11) and, if necessary, presses against the carrier. Auslöser nach Anspruch 3, dadurch gekennzeichnet, daß der Träger (20) eine der konvexen Seite (12) der Schnappscheibe (11) entsprechende Vertiefungen (21) aufweist.Trigger according to claim 3, characterized in that the carrier (20) has a recess (21) corresponding to the convex side (12) of the snap disc (11). Auslöser nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Träger (10, 20) und/oder das Halteelement (13, 14, 15; 23, 24, 25) ein Heizleiter ist.Trigger according to one of the preceding claims, characterized in that the carrier (10, 20) and / or the holding element (13, 14, 15; 23, 24, 25) is a heating conductor. Auslöser nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Schnappscheibe (11) kreisförmig oder mehr-, insbesondere viereckig ist.Trigger according to one of the preceding claims, characterized in that the snap disc (11) is circular or polygonal, in particular square.
EP94116279A 1993-10-22 1994-10-15 Thermal overcurrent trip for an electrical switching device Withdrawn EP0650179A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934336073 DE4336073A1 (en) 1993-10-22 1993-10-22 Thermal overcurrent release for an electrical switching device
DE4336073 1993-10-22

Publications (1)

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EP0650179A1 true EP0650179A1 (en) 1995-04-26

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EP94116279A Withdrawn EP0650179A1 (en) 1993-10-22 1994-10-15 Thermal overcurrent trip for an electrical switching device

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EP (1) EP0650179A1 (en)
DE (1) DE4336073A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2772980A1 (en) * 1997-12-19 1999-06-25 Schneider Electric Sa MAGNETO-THERMAL TRIPPING DEVICE AND CIRCUIT BREAKER EQUIPPED WITH THIS DEVICE
EP1041596A2 (en) * 1999-03-30 2000-10-04 Heinrich Kopp Ag Thermal triggering device for circuit breaker
DE202013007062U1 (en) 2013-08-07 2014-11-12 Leoni Bordnetz-Systeme Gmbh Device for the mechanical locking of a charging plug in a charging socket

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259763A (en) * 1962-12-04 1966-07-05 Texas Instruments Inc Thermally responsive control means
DE1236655B (en) * 1962-05-21 1967-03-16 Martin Hornig Microthermal relay
US3852695A (en) * 1973-04-09 1974-12-03 L Northrup Electrical switching system
DE2709175A1 (en) * 1977-03-03 1978-09-07 Inter Control Koehler Hermann Thermostat combination mounted on common base plate - supports ceramic resistor by angle bracket with prongs at different levels
DE3637275C1 (en) * 1986-11-03 1988-05-05 Flohr Peter Overcurrent trip device for protection switching apparatuses

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE588077C (en) * 1933-11-13 Voigt & Haeffner Akt Ges Thermal relay with a non-unwindable disc made of bimetal that serves as a thermal element
DE1033308B (en) * 1956-09-11 1958-07-03 Licentia Gmbh Small electrical thermal switch
US4088976A (en) * 1975-10-14 1978-05-09 Technar, Inc. Thermally operated bimetal actuator
DE2701884A1 (en) * 1976-01-19 1977-07-21 Delta Materials Research Ltd CURRENT OVERLOAD PROTECTION
JPS5582893A (en) * 1978-12-14 1980-06-21 Miyawaki Steam Trap Mfg Bimetal column
YU46294B (en) * 1985-04-12 1993-05-28 Zdarilek, Branko THERMAL CURRENT PROTECTOR WITH AUTOMATIC ACTION
KR940002671B1 (en) * 1990-04-06 1994-03-28 가부시끼가이샤 히다찌세이사꾸쇼 Device for protecting overload with bimetal
DE4142965A1 (en) * 1991-12-24 1993-07-01 Abb Patent Gmbh THERMAL RELEASE
DE4224046C2 (en) * 1992-07-21 1994-07-07 Elektroelement Izlake D D Overcurrent release for protective switching devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1236655B (en) * 1962-05-21 1967-03-16 Martin Hornig Microthermal relay
US3259763A (en) * 1962-12-04 1966-07-05 Texas Instruments Inc Thermally responsive control means
US3852695A (en) * 1973-04-09 1974-12-03 L Northrup Electrical switching system
DE2709175A1 (en) * 1977-03-03 1978-09-07 Inter Control Koehler Hermann Thermostat combination mounted on common base plate - supports ceramic resistor by angle bracket with prongs at different levels
DE3637275C1 (en) * 1986-11-03 1988-05-05 Flohr Peter Overcurrent trip device for protection switching apparatuses

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2772980A1 (en) * 1997-12-19 1999-06-25 Schneider Electric Sa MAGNETO-THERMAL TRIPPING DEVICE AND CIRCUIT BREAKER EQUIPPED WITH THIS DEVICE
EP0926694A1 (en) * 1997-12-19 1999-06-30 Schneider Electric Sa Magnetothermal control device and a circuit breaker equiped with such a device
EP1041596A2 (en) * 1999-03-30 2000-10-04 Heinrich Kopp Ag Thermal triggering device for circuit breaker
EP1041596A3 (en) * 1999-03-30 2002-01-16 Heinrich Kopp Ag Thermal triggering device for circuit breaker
DE202013007062U1 (en) 2013-08-07 2014-11-12 Leoni Bordnetz-Systeme Gmbh Device for the mechanical locking of a charging plug in a charging socket

Also Published As

Publication number Publication date
DE4336073A1 (en) 1995-04-27

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