EP2065913B1 - Vorrichtung zur thermischen Auslösung für elektrisches Gerät zum Leitungsschutz - Google Patents

Vorrichtung zur thermischen Auslösung für elektrisches Gerät zum Leitungsschutz Download PDF

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Publication number
EP2065913B1
EP2065913B1 EP08305864A EP08305864A EP2065913B1 EP 2065913 B1 EP2065913 B1 EP 2065913B1 EP 08305864 A EP08305864 A EP 08305864A EP 08305864 A EP08305864 A EP 08305864A EP 2065913 B1 EP2065913 B1 EP 2065913B1
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EP
European Patent Office
Prior art keywords
bimetal
thermal
convection means
trip device
conductor
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.)
Active
Application number
EP08305864A
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English (en)
French (fr)
Other versions
EP2065913A1 (de
Inventor
Claudia Dietrich
Stéphane Eloy
Nikola Puh
Sabine Siegel
David Weil
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.)
Hager Electro SAS
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Hager Electro SAS
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Publication of EP2065913A1 publication Critical patent/EP2065913A1/de
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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
    • H01H71/164—Heating elements
    • 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

Definitions

  • the invention relates more particularly to small circuit breakers, for which the thermal devices are generally constituted by a bimetallic strip without current flow, and a heating wire wound around the bimetallic strip and traversed by the current of the line.
  • the heating wire makes it possible to use a bimetallic thick enough to develop the force required to trigger the mechanism for opening and closing contacts.
  • This structure also offers a remarkable compactness, because the heating wire is directly wound around the bimetallic strip, and does not occupy a specific space in the vicinity of it.
  • the heating wire having a high impedance in particular due to its small section, it quickly reaches its melting temperature when it is crossed by high currents, for example in case of short circuit. This is a disadvantageous limitation if the breaking power sought for the electrical apparatus is high. Moreover, such a solution is not favorable in terms of industrialization in the case of manual manufacture, because it requires soldering the heating wire.
  • the present invention proposes to overcome these disadvantages, while maintaining the aforementioned advantages.
  • the configuration implemented in the context of the present invention has a robustness and compactness of the same order as those conferred by the heating wire solution, while at the same time significantly improving the breaking strength. .
  • the thermal subassembly of the invention comprises a bimetallic strip and thermal convection means traversed by the current carried on a line, the bimetallic strip and the thermal convection means being arranged in the casing so that the bimetal is in the heat flow emitted by the convection means.
  • the objective of the invention is to optimize the configurations obeying this principle.
  • the thermal tripping device of the invention is characterized in that the thermal convection means consist of a conductive sheet metal conductor cut and folded according to a geometry intended to make the length of the conductor largest possible in a given space, said conductor being placed in front and near the bimetallic strip.
  • One of the basic ideas of the invention is, at the same time as providing indirect heating of the bimetal, to increase the impedance of the medium. heating, hence the increase in the length of the conductor, which leads to protect the bimetallic and corollary to increase the possibilities of choice for it: it can in particular be chosen higher impedance, then having a deflection specific more important than in a traditional architecture.
  • the device is also made more limiting, which leads to reduce thermal stress during cuts and to further preserve the bimetallic strip.
  • the length of the thermal convection means takes part, on the one hand, in one of the initial objectives of the system of the invention, namely the heating of the surrounding air so as to have a correct impact on the bimetallic strip, and on the other hand part plays a role in the control of impedance, and consequently the power of cutoff.
  • the thermal convection means consist of a central portion of plane shape located opposite the bimetal and two end lugs respectively connected to a braid from the bimetal and one end of the wound conductor.
  • the central portion is in the form of an elongated aliasing.
  • the thermal convection means are placed in series with the bimetallic strip.
  • thermal convection means and the bimetal can be placed in parallel.
  • the relative disposition of the convection means and the bimetallic strip in space must be such that said bimetal strip can be heated by the circulation of the heated air obtained using the convection means.
  • the thermal convection means and the bimetallic strip, forming an assembly are in practice connected between a terminal of one of the connection devices to a line and one of the fixed or mobile contacts.
  • the bimetal is welded to said terminal, the free end of said bimetal strip being connected to the thermal convection means by a conductive braid, an end lug of the convection means being welded to the coil.
  • the thermal convection means are preferably housed in a portion of the insulating housing of the electrical apparatus provided with walls delimiting a restricted space favoring the heating of the bimetal by convection.
  • bimetal (1) is welded to a terminal (2) at one of its ends.
  • the other end is connected by means of a braid (3) to an end lug (4) of a convector (5) whose other end is equipped with a second lug (6) allowing its connection to the coil (7) of a magnetic subassembly, equipped at the output of a fixed contact (8).
  • This assembly which integrates the thermal function and the magnetic function, is intended to equip a circuit breaker as shown in FIG. figure 2 .
  • the terminal (2) cooperates in this case with a cage connection device (9) and screw (10). It slides in the cage (9 in the direction of the axis of rotation of the screw (10) .
  • the assembly consisting of the bimetallic strip (1), the braid (3), the end lugs (4, 6) and the convector (5) is disposed in an area of the housing (B) providing a relatively confined space for convection of air, which space is schematically represented by the hatching (11)
  • the magnetic subassembly (12) besides participating in this confinement, on the right of the device of the invention.
  • the air heated by the convector, circulating in this zone, makes it possible to raise the temperature of the bimetallic strip (1), so that it undergoes a deflection enabling it to act on the latch release mechanism of the circuit breaker.
  • the geometric configuration of the convection means, as appearing in figure 1 is, for example, the following one: an elongated aliasing (5), arranged in front of the bimetallic strip (1), allows a production of heat directly impacting said bimetallic strip (1).
  • the convector (5) located near the bimetallic strip (1), heats the ambient air and therefore indirectly heats the bimetallic strip (1).
  • the compactness of the convection means (5) is in particular obtained by this planar geometry, which can then be easily integrated into the thickness of the circuit breaker (see FIG. figure 2 ). This geometry favors heat exchanges with the ambient air. Such a geometry can finally have a direct impact on the heat production of the convector (5), since it allows to easily adjust the length thereof.
  • the section of the latter is calculated as a function of the nature of the material. Once this minimum section is obtained, the heat production can be controlled by adjusting the length of the convector (5).

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  • Breakers (AREA)

Claims (8)

  1. Thermische Auslösevorrichtung für ein elektrisches Leitungsschutzgerät, umfassend in einem isolierenden Gehäuse:
    - mindestens ein Paar jeweils fester und beweglicher Kontakte;
    - einen Schlossmechanismus zum Öffnen und Schließen der Kontakte, der mit einem Steuerhebel zusammenwirkt;
    - eine thermische Baugruppe (1) mit Bimetall und eine magnetische Baugruppe (12) mit einer Spule (7), die dazu geeignet sind, den Schlossmechanismus umzuschalten, um die Kontakte im Falle eines anormalen Stromanstiegs zu öffnen; und
    - Ein- und Ausgangsvorrichtungen zum Anschließen des elektrischen Geräts an mindestens eine Leitung;
    - thermische Konvektionsmittel (5), durch die der Strom fließt, der auf einer Leitung transportiert wird, wobei das Bimetall (1) und die thermischen Konvektionsmittel (5) in dem Gehäuse (B) angeordnet sind, so dass sich das Bimetall (1) in dem Wärmefluss befindet, der von den Konvektionsmitteln (5) abgegeben wird;
    wobei die thermischen Konvektionsmittel aus einem Leiter (5) aus zugeschnittenem und gefaltetem, leitfähigem Blech bestehen,
    dadurch gekennzeichnet, dass der Leiter (5) einen mittleren Abschnitt aufweist, der in Form einer länglichen Auszackung vorliegt, wobei der Leiter (5) gegenüber dem Bimetall (1) und in dessen Nähe angeordnet ist.
  2. Thermische Auslösevorrichtung nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die thermischen Konvektionsmittel (5) aus dem mittleren Abschnitt, der einen ebenen Verlauf aufweist und sich gegenüber dem Bimetall (1) befindet, und aus zwei Endlaschen (4, 6), die jeweils mit einem Geflecht (3) aus dem Bimetall (1) und mit einem Ende des gewickelten Leiters verbunden sind, bestehen.
  3. Thermische Auslösevorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die thermischen Konvektionsmittel (5) mit dem Bimetall (1) in Reihe angeordnet sind.
  4. Thermische Auslösevorrichtung nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass die thermischen Konvektionsmittel (5) und das Bimetall (1) parallel angeordnet sind.
  5. Thermische Auslösevorrichtung nach einem der Ansprüche 3 und 4, dadurch gekennzeichnet, dass die thermischen Konvektionsmittel (5) und das Bimetall (1) zwischen einer Klemme (2) einer der Vorrichtungen zum Anschließen an eine Leitung und einen der festen oder beweglichen Kontakte angeschlossen sind.
  6. Thermische Auslösevorrichtung nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die thermischen Konvektionsmittel (5) und das Bimetall (1) zwischen einer Klemme (2) einer der Vorrichtungen zum Anschließen an eine Leitung und der Spule (7) der magnetischen Baugruppe (12) angeschlossen sind, an deren Ausgang der feste Kontakt (8) angeschlossen ist.
  7. Thermische Auslösevorrichtung nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass das Bimetall (1) an die Klemme (2) geschweißt ist, wobei das freie Ende des Bimetalls (1) an die thermischen Konvektionsmittel (5) über ein leitfähiges Geflecht (3) angeschlossen ist, wobei eine Endlasche (6) der Konvektionsmittel an die Spule (7) geschweißt ist.
  8. Thermische Auslösevorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie in einem Abschnitt des Gehäuses (B) untergebracht ist, der das elektrische Gerät isoliert und mit Wänden versehen ist, die einen eingeschränkten Raum (11) begrenzen, wodurch die Konvektionserwärmung des Bimetalls (1) gefördert wird.
EP08305864A 2007-11-29 2008-11-28 Vorrichtung zur thermischen Auslösung für elektrisches Gerät zum Leitungsschutz Active EP2065913B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0708350A FR2924531A1 (fr) 2007-11-29 2007-11-29 Dispositif de declenchement thermique pour appareil electrique de protection de ligne

Publications (2)

Publication Number Publication Date
EP2065913A1 EP2065913A1 (de) 2009-06-03
EP2065913B1 true EP2065913B1 (de) 2011-06-22

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EP (1) EP2065913B1 (de)
AT (1) ATE514176T1 (de)
ES (1) ES2367764T3 (de)
FR (1) FR2924531A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9417754B2 (en) 2011-08-05 2016-08-16 P4tents1, LLC User interface system, method, and computer program product

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0143022B1 (de) * 1983-10-21 1988-06-01 Merlin Gerin Thermischer und magnetischer Auslöser für Selbstschalter
DE4300909C2 (de) * 1993-01-15 1997-02-06 Abb Patent Gmbh Thermischer Auslöser, insbesondere für einen Leitungsschutzschalter

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ES2367764T3 (es) 2011-11-08
ATE514176T1 (de) 2011-07-15
EP2065913A1 (de) 2009-06-03
FR2924531A1 (fr) 2009-06-05

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