EP0603663B1 - Déclencheur magnétothermique - Google Patents

Déclencheur magnétothermique Download PDF

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Publication number
EP0603663B1
EP0603663B1 EP93119852A EP93119852A EP0603663B1 EP 0603663 B1 EP0603663 B1 EP 0603663B1 EP 93119852 A EP93119852 A EP 93119852A EP 93119852 A EP93119852 A EP 93119852A EP 0603663 B1 EP0603663 B1 EP 0603663B1
Authority
EP
European Patent Office
Prior art keywords
arms
tripping device
bimetallic snap
coil
action
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
EP93119852A
Other languages
German (de)
English (en)
Other versions
EP0603663A1 (fr
Inventor
Erhard Runtsch
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 EP0603663A1 publication Critical patent/EP0603663A1/fr
Application granted granted Critical
Publication of EP0603663B1 publication Critical patent/EP0603663B1/fr
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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H01H71/402—Combined electrothermal and electromagnetic mechanisms in which the thermal mechanism influences the magnetic circuit of the electromagnetic mechanism

Definitions

  • the invention relates to a thermal and an electromagnetic release according to the preamble of claim 1.
  • thermal and magnetic releases are used in particular in circuit breakers, the thermal release responding to a so-called overcurrent and the electromagnetic release responding to a short-circuit current.
  • the thermal bimetal is designed as a bimetal strip which is heated either directly or indirectly by the overcurrent.
  • direct heating current flows through the bimetallic strip, whereas with indirect heating the bimetallic strip is surrounded by a heating winding which is flowed through by the current and heats up as a result; in both cases the bimetal clamped on one side bends, actuates a key switch and opens contact points in the network conductors to be protected.
  • DE-GM 18 84 376 may be mentioned as an example of such arrangements.
  • thermobimetal with a circular shape is assigned to a coil, the thermobimetal being exposed to the electromagnetic field of the coil.
  • the thermobimetal element deforms due to heating, both because of eddy currents due to changes in the electromagnetic field and due to the heat losses of the electromagnet.
  • an overcurrent release for protective switching devices has become known, in which an electromagnet is assigned a bimetallic snap disk, which is heated by the electromagnet and actuates the plunger connected to the magnet armature due to heating, so that a switching latch is released and thereby a contact point can be opened.
  • the bimetallic snap disk must have a relatively low working temperature, low working temperatures resulting in a relatively large influence by external temperature influences. These can be the change in the ambient temperature at the place of use or a change in the temperature influence due to the mutual temperature influence of the poles with flush mounting or when used as a multi-pole switch. For multi-pole switches, either snap disks with a different response temperature must be used or a different heating output must be generated by changing the coil.
  • the object of the invention is to provide an arrangement of the type mentioned, in which the working temperature is increased and the influence of the ambient temperature at the place of use is reduced.
  • the plunger is thus actuated via the magnet armature and the bimetallic snap element is designed as a bimetallic snap strip and is fixed between two arms forming the carrier body.
  • the heat transfer from the heat source that is to say the coil, thus takes place at the ends of the bimetallic snap strip, or bimetallic strip for short, via the yoke in a more expedient manner Wise attached arms that are copper-plated for better heat conduction or coated with another corrosion-resistant, good heat conductor.
  • the arms are designed as cutting edge bearings in accordance with the characterizing features of claim 3.
  • the storage designed as a cutting edge bearing, which is non-positive over both bearing points, can be adjusted according to the characterizing features of claim 4, whereby the response temperature (snap temperature) of the bimetallic strip can be adjusted in a certain temperature range according to requirements.
  • the required adjustment range can result from the use for coils with different heating capacities, which result from mutual interference in multi-pole switches, from different ambient temperatures or from other desired characteristics or nominal current ranges.
  • the setting can be made externally before installing the snap strip or later in the assembled state on the switching device, which is possible in particular when using an adjusting screw.
  • the encapsulation made of a poorly heat-conducting material can have an opening under which a tensioning element which changes the distance between the two arms and thus the snap action of the bimetallic snap strip is arranged according to the characterizing features of claim 7, the embodiment designed in this way allowing the adjustment Clamping process no longer manually takes place, but automatically and depending on the temperature change, which depends on the mutual influence or on the changed ambient temperature.
  • the temperature-dependent element that controls the distance is "open" to the surrounding air, so that the ambient air can act on this element.
  • the snap element is provided in the storage area with good heat-conducting, resilient elements, which form good thermal contact with the good heat-conducting, appropriately designed yoke.
  • the snap element itself is largely encapsulated or surrounded with poorly heat-conducting materials, for example insulating material, so that the heat supplied by the neighboring device via the heat conduction does not act directly on the bimetal strip.
  • the outward-facing side of the encapsulation can simultaneously form the outer wall of the circuit breaker.
  • a circuit breaker as shown in Figure 1, has a main current path 10, the ends of which have terminals 11 and 12, and in which there is a contact point 13, which may be assigned to arc extinguishing plates, and an electromagnetic system 14 with a coil.
  • the switching device also has a thermal release 15 which is designed as a bimetallic snap strip and is clamped between two bearings 16 and 17.
  • the electromagnet system 14 acts on the one hand via an action line 18 on the contact point 13 for opening the contact point 13 and via an action line 19 on a switching lock 20 which is released from the armature of the electromagnet system 14 and opens the contact point 13 via the action line 21.
  • the electromagnet system 14 opens in the event of short-circuit currents, whereas the thermal bimetal 15 acts on the latching point in the switching mechanism via an active line 22 when overcurrents occur.
  • the bimetallic metal 15 is designed as a bimetallic snap strip, which is clamped on both sides at the two bearing points 16 and 17 and which is snapped due to heating coming from the coil of the electromagnetic system 14 (broken line 15 ') and thus acts on the latching point via the impact anchor.
  • the electromagnetic system 14 is shown in FIG. 2.
  • a plunger 27 is connected to the armature 26, which passes through a bore 28 in the core and is moved in the direction of arrow P when a short-circuit current occurs, where it acts on the contact point 13 or the line of action 19 on the switching mechanism 20 via the line of action 18.
  • the coil is surrounded by a yoke 29 which is C-shaped and to which both the coil body 24 and the magnetic core 25 are fastened in a manner not shown.
  • Two relatively rigid, resilient arms 30 and 31 are fastened to the yoke 29, arms 32, 33, which are bent inwards and are attached to the end of the yoke 29 opposite the core, which surround the coil 23 and to which the other end of the coil body 24 is fastened is.
  • These arms 32 and 33 have bends 34 and 35 with which the arms 30 and 31 are attached to the yoke.
  • the arms 30 and 31 also have spring feet 36 and 37 which rest on the yoke regions running parallel to the central axis of the plunger 27, so that the fastening points 32/34; 33/35 and the feet 36 and 37 a sufficiently good thermal contact between the yoke 29 and the arms 30 and 31 is achieved.
  • the free ends of the arms 30 and 31 have a V-shaped bend 38 and 39, the open side of which is directed towards each other, these two V-shaped bends 38 and 39 corresponding to the bearings 16 and 17 and a cutting edge bearing for a thermobimetal 15 corresponding Form bimetallic strip 40.
  • the bimetallic strip 40 is a snap strip which, due to an increase in temperature, flows through the coil 23 or through the coil 23 Electricity is generated to the extent that it is bent out so that it snaps into the dashed position 40 '.
  • the bimetallic snap strip 40 acts on the armature 26 via an extension 41 located on the armature 26, shown only by dashed lines, and on the switching mechanism 20 via the plunger 27.
  • the stiffness of the resilient arms 30, 31 is such that the bimetallic strip 40 can be snapped in, but the bimetallic snap strip 40 practically does not rest on the arms when it is snapped over, in order to avoid changes in response characteristics.
  • the bimetallic snap strip 40 together with the arms 30, 31, is surrounded by a housing 42, which consists of a material with poor thermal conductivity.
  • a housing 42 which consists of a material with poor thermal conductivity.
  • an adjustment screw 43 is screwed in perpendicular to the arm 30, which acts on the outside of the arm 30 and, when screwed in, changes the distance between the arms 30 and 31 or the distance between the bearing elements 38 and 39; H. reduced or enlarged.
  • the response characteristic of the thermobimetal 40 can be adjusted as required.
  • FIG. 3 A further embodiment of the invention, in particular the adjustability of the distance, is shown in FIG. 3.
  • the thermal bimetal 40 is clamped between the V-shaped bearings 44 and 45 on arms 46 and 47, which arms 46 and 47 correspond to arms 30 and 31.
  • the arms 46 and 47 have extensions 48 and 49, which have one another, the ends 50 and 51 of which are bent in an L-shape, so that the free ends run parallel to one another.
  • An adjustment screw 52 can be screwed through the two free ends, with which the distance the free ends 50 and 51 and thus the distance between the bearing points 44 and 45 can be adjusted.
  • FIG. 4 shows a further embodiment of the invention.
  • the arms 52 and 53 which are attached in the same way as the arms 30 and 31 to the yoke 29 with good thermal conductivity, each have an extension 54 and 55, which run parallel to one another. Between the extensions 54 and 55 there is a tensioning element 56 which changes its length due to temperature changes and which is attached below an opening 57 in a housing 58 corresponding to the housing 42. Ambient air reaches the tensioning element 56 through the opening 57, as a result of which the distance between the arms 52 and 53 changes and the thermobimetal 40 can thus be compensated for.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermally Actuated Switches (AREA)
  • Adhesive Tapes (AREA)
  • Breakers (AREA)
  • Electromagnets (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Claims (11)

  1. Déclencheur thermique et électromagnétique, comportant un noyau magnétique (25) et une armature battante (26), une bobine (23) et une culasse (29) qui entoure la bobine, un support (30, 31) pour un bilame (40) à détente brusque, qui est disposé côté frontal, devant la culasse (29), et est lié à cette dernière, lequel bilame est réchauffé lorsqu'apparaît une surintensité et passe d'une première position stable à seconde position stable et revient dans la première position lors d'un refroidissement consécutif, le bilame par son passage dans la seconde position stable actionnant un poussoir (27) qui pémètre dans un trou du noyau (25), aux fins de déclencher un verrou de maintien (20), caractérisé par le fait que le poussoir (27) est actionné par l'intermédiaire de la culasse (26), par le fait que le bilame à détente brusque est agencé sous la forme d'une bande-bilame (40) à détente brusque et est fixé entre deux branches (30, 31; 46, 47; 52, 53) formant supports et par le fait que les branches (30, 31; 46, 47; 52, 53) sont élastiques, la tension mécanique produite par les branches (30, 31; 46, 47; 52, 53) dans la bande-bilame (15, 40) étant réglable.
  2. Déclencheur selon la revendication 1, caractérisé par le fait que les branches (30, 31; 46, 47; 52, 53) en matériau bon conducteur de la chaleur sont fixées de manière bonne conductrice de la chaleur sur la culasse (29), la bande-bilame (40) à détente brusque étant chauffée par la bobine (23) par l'intermédiaire des branches (30, 31; 46, 47; 52, 53) lors de l'apparition d'une surintensité dans la bobine (23).
  3. Déclencheur selon la revendication 2, caractérisé par le fait que la bande-bilame (40) à détente brusque est entourée d'une enveloppe formant boîtier (58) en matériau mauvais conducteur de la chaleur, de préférence en matériau isolant.
  4. Déclencheur selon la revendication 2 ou 3, caractérisé par le fait que les branches (30, 31; 46, 47; 52, 53) présentent à leur extrémité libre des appuis (38, 39; 44, 45) en V dont les parties ouvertes sont disposées en vis-à-vis l'une de l'autre et qui forment des appuis à couteau pour les bords d'extrémité de la bande-bilame (40).
  5. Déclencheur selon l'une des revendications 2 à 4, caractérisé par le fait que la distance entre les extrémités des branches (30, 31; 46, 47; 52, 53) est réglable.
  6. Déclencheur selon la revendication 5, caractérisé par le fait que la distance entre branches peut être réglée au moyen d'une vis de réglage (43).
  7. Déclencheur selon la revendication 6, caractérisé par le fait que la vis de réglage (43) peut être vissée de l'extérieur dans le boîtier (42) et de ce fait appuie de l'extérieur contre l'une des branches (30) afin de modifier l'espacement entre les branches (30, 31).
  8. Déclencheur selon la revendication 5, caractérisé par le fait qu'une vis de tension (52) à l'aide de laquelle la distance entre branches peut être réglée, est prévue entre les branches (46, 47)
  9. Déclencheur selon la revendication 8, caractérisé par le fait que les branches (46, 47) présentent un prolongement (48) avec des parties en vis-à-vis dont les extrémités (50, 51) sont pliées en L et sont mutuellement en parallèle et par le fait que la vis de tension (52) est vissée dans les extrémités libres (50, 51).
  10. Déclencheur selon la revendication 5, caractérisé par le fait qu'un élément (56) dont la longueur varie sous l'influence de la température est prévu entre les branches (52, 53), élément à l'aide duquel l'espacement entre les branches (52, 53) est modifié de manière automatique.
  11. Déclencheur selon la revendication 10, caractérisé par le fait que le boîtier (58) comporte une ouverture (57) par l'intermédiaire de laquelle l'élément (56) communique avec l'air ambiant de telle sorte que l'élément (56) serve d'élément de compensation de température.
EP93119852A 1992-12-16 1993-12-09 Déclencheur magnétothermique Expired - Lifetime EP0603663B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4242516A DE4242516A1 (de) 1992-12-16 1992-12-16 Thermischer und elektromagnetischer Auslöser
DE4242516 1992-12-16

Publications (2)

Publication Number Publication Date
EP0603663A1 EP0603663A1 (fr) 1994-06-29
EP0603663B1 true EP0603663B1 (fr) 1996-11-06

Family

ID=6475468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93119852A Expired - Lifetime EP0603663B1 (fr) 1992-12-16 1993-12-09 Déclencheur magnétothermique

Country Status (4)

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EP (1) EP0603663B1 (fr)
AT (1) ATE145088T1 (fr)
DE (2) DE4242516A1 (fr)
ES (1) ES2096188T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2772980B1 (fr) * 1997-12-19 2000-01-21 Schneider Electric Sa Dispositif de declenchement magneto-thermique et disjoncteur equipe de ce dispositif
DE19942694C2 (de) * 1999-09-07 2002-06-27 Eti Elektroelement Dd Auslöser für elektrische Schutzschalter
DE102004056279A1 (de) * 2004-11-22 2006-05-24 Abb Patent Gmbh Schaltgerät mit einem thermischen und elektromagnetischen Auslöser
DE102004056282A1 (de) * 2004-11-22 2006-05-24 Abb Patent Gmbh Schaltgerät mit einem thermischen und elektromagnetischen Auslöser
DE202011110187U1 (de) 2011-11-22 2013-01-18 Ellenberger & Poensgen Gmbh Elektrisches Schaltgerät
WO2013075726A1 (fr) 2011-11-22 2013-05-30 Ellenberger & Poensgen Gmbh Commutateur électrique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE469878C (de) * 1925-03-25 1929-01-02 Aeg Ausloesevorrichtung fuer Selbstschalter
US2170412A (en) * 1936-12-17 1939-08-22 Westinghouse Electric & Mfg Co Circuit breaker
DE1033308B (de) * 1956-09-11 1958-07-03 Licentia Gmbh Elektrischer Klein-Thermoschalter
DE1822570U (de) * 1956-10-27 1960-12-01 Theodor Kiepe Elektrotechnisch Mit thermischer und elektromagnetischer ausloesung ausgeruestete selbsttaetige abschaltvorrichtung.
DE1884376U (de) * 1963-06-12 1963-12-12 Licentia Gmbh Bimetallanordnung fuer schaltgeraete.
DE3637275C1 (en) * 1986-11-03 1988-05-05 Flohr Peter Overcurrent trip device for protection switching apparatuses
DE3738795A1 (de) * 1987-11-14 1989-05-24 Asea Brown Boveri Selbstschalter

Also Published As

Publication number Publication date
EP0603663A1 (fr) 1994-06-29
DE4242516A1 (de) 1994-06-23
ATE145088T1 (de) 1996-11-15
ES2096188T3 (es) 1997-03-01
DE59304417D1 (de) 1996-12-12

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