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EP3185275B1 - Vorrichtung zur montage eines bimetallstreifens und eines teils, das einen träger dieses bimetallstreifens bildet, und elektrische schutzvorrichtung, die eine solche vorrichtung umfasst - Google Patents

Vorrichtung zur montage eines bimetallstreifens und eines teils, das einen träger dieses bimetallstreifens bildet, und elektrische schutzvorrichtung, die eine solche vorrichtung umfasst Download PDF

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Publication number
EP3185275B1
EP3185275B1 EP16194499.6A EP16194499A EP3185275B1 EP 3185275 B1 EP3185275 B1 EP 3185275B1 EP 16194499 A EP16194499 A EP 16194499A EP 3185275 B1 EP3185275 B1 EP 3185275B1
Authority
EP
European Patent Office
Prior art keywords
bimetal strip
support
bimetallic strip
strip
bimetal
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
EP16194499.6A
Other languages
English (en)
French (fr)
Other versions
EP3185275A1 (de
Inventor
David Couzon
José Garcia
Sylvain Battail
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP3185275A1 publication Critical patent/EP3185275A1/de
Application granted granted Critical
Publication of EP3185275B1 publication Critical patent/EP3185275B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • H01H71/7436—Adjusting the position (or prestrain) of the bimetal
    • 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
    • H01H71/08—Terminals; Connections
    • H01H2071/084—Terminals; Connections specially adapted for avoiding decalibration of trip unit, e.g. bimetal, when fixing conductor wire to connector
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures

Definitions

  • the present invention relates generally to bimetallic thermal trip units for current-breaking devices, in particular circuit breakers. It relates more particularly to a device for assembling a bimetallic strip and a part serving to support this bimetallic strip in a current-breaking device, said bimetallic strip being electrically connected by a first end, said free end, to a first connection range. said input, and another end by which the bimetallic is fixed to said support, to a second so-called output connection range.
  • the document is known FR 2,669,144 describing such an assembly.
  • This document describes the assembly in two perpendicular planes of a bimetallic strip and a conductive flat part serving as a support, this assembly being made by embedding the part lower bimetallic shaped tenon in a recess serving as mortise provided in the support piece.
  • the current flows from an input terminal, through a ribbon surrounding the bimetallic strip, then from the free end of the bimetallic strip, through the length of the bimetallic strip, then through the support of bimetal, then in the winding of an electromagnetic coil which is electrically connected to an output terminal of the apparatus.
  • the bimetallic foot corresponding to the point of attachment of the bimetallic strip on the support, has a reduced section corresponding to the section of the aforementioned tenon.
  • This weak section of the bimetal results in a large power generated by the subset including the bimetallic strip and the support.
  • This section of reduced passage is thus interesting for the weak currents but penalizing for the strong currents.
  • the present invention solves this problem and proposes a device for assembling a bimetallic strip on its support making it possible to increase the operating current of the apparatus which comprises it while keeping the same size of this apparatus, as well as an apparatus power failure device comprising such an assembly device.
  • the subject of the present invention is an assembly device of the kind mentioned above, this device being characterized in that this bimetal is mounted through the aforementioned support so that it can be fixed at different points along the length of the this bimetallic strip, said bimetallic strip thus having a first and a second part situated respectively on one side and the other side of the aforementioned support, the first part situated on the side of the free end of the bimetallic strip, corresponding to the so-called useful surface of this bimetal, the length of this useful surface being variable depending on the length of installation of this bimetallic strip in the support, this embedding length being determined according to the caliber of the apparatus in order to obtain a constant thermal stroke, whatever the caliber.
  • the so-called output electrical connection range is electrically connected to the second part of the aforementioned bimetallic strip.
  • the fixation of the bimetallic strip on the support is carried out by welding.
  • the present invention also relates to an electrical protection apparatus comprising a thermal release device comprising a bimetallic strip, this device comprising a device for assembling the bimetallic strip on its support comprising the previously mentioned characteristics taken alone or in combination.
  • this apparatus comprises an electromagnetic tripping device comprising a coil, this coil having a first end electrically connected to the second bimetal portion and a second end electrically connected to the aforementioned output range.
  • this device is a low voltage circuit breaker.
  • thermal-thermal trigger device D belonging to a low-voltage circuit breaker, this device comprising, in a manner known per se, a thermal tripping device T comprising a bimetallic strip 1, and a magnetic tripping device M comprising a coil 2 said triggering devices being connected in series between a so-called input 3 or upstream connection pad connected to the input terminal of the apparatus and a so-called output or downstream connection pad 4 electrically connected to the output terminal of the device.
  • this magnetothermic assembly comprises a thermal assembly T and a magnetic assembly M.
  • This thermal assembly comprises a bimetallic strip 1 supported by a bimetallic support 5, whereas the magnetic assembly M comprises a coil 2 supported by a bead 6, these two sets being supported by an insulating support 7 intended to isolate the different parts to each other.
  • a bimetallic thermal release T is intended to provide protection against overloads, the heating of the bimetallic strip 1 being representative of the heating of the device or the protected electrical installation, so as to trigger the switchgear device. when this heating exceeds a predetermined threshold.
  • This heating of the bimetallic strip is achieved by passing the current through the bimetallic strip 1, and indirectly by passing the current through an insulated electric heater 8 in electrical contact with the bimetallic strip 1.
  • This strip-shaped heater 8 is made of a material having a resistivity appropriate and is applied against a thin insulating sleeve 9 surrounding the bimetallic strip 1, approximately between the two ends of the latter.
  • the ribbon 8 has a first end 8a which is electrically connected to a so-called input 3 or upstream connection zone leading to an input terminal (not represented) of current and a second end 8b which is connected to the bimetallic strip 1, by example by electric welding, at a particular point of the bimetallic strip located near the free end 1a thereof.
  • This bimetallic strip is intended to be fixed on the abovementioned bimetallic support 5, which support is intended to be fixed in the housing of the apparatus. This fixation of the bimetal is advantageously carried out by soldering or brazing.
  • This coil 2 is constituted by a winding comprising a first end 2a electrically connected to the bimetallic strip 1, and a second end 2b electrically connected to a so-called downstream connection zone 10 said output connected to an output terminal of the device
  • the bimetallic strip 1 is mounted through an opening 5a provided in the abovementioned bimetallic support 5 so as to be fixed to said support 5 at different points of the bimetallic strip selected along the length of the bimetallic strip 1.
  • this useful surface of the bimetallic strip corresponds to its first part 1a situated above the support 5. The user will thus be able to choose the length of this useful surface according to the size of the apparatus, as this is more particularly illustrated.
  • the first end 2a of the coil 2 is electrically connected to the bimetallic strip 1 in an area under the attachment zone z of the bimetallic strip 1 on the aforementioned support 5 as illustrated in FIGS. Figures 2 and 3 .
  • bimetallic strip 1 corresponds to that used in a device having a small size.
  • the embedding length 1 of the bimetallic strip 1 with respect to the support 5 is minimal, the zone of the bimetallic strip located under the support corresponding substantially to the area necessary for fixing the coil on the bimetallic strip.
  • the deflection of bimetallic strip 1 in the event of an electrical fault of thermal origin results in a curvature of its free end 1a that can be measured by a length x corresponding to a component of this deflection, this component corresponding to the length between the point of attachment f of the bimetallic strip 1 on the support 5 and a point p corresponding to the projection of the free end 1a of the bimetallic strip on an axis X, this axis X being substantially perpendicular to the longitudinal direction of the bimetallic strip.
  • This component x corresponds to the thermal path of the bimetallic strip.
  • bimetallic strip 1 corresponds to that used in a device with a high rating.
  • the embedding length l is increased by a value Y relative to that of the bimetallic strip of the preceding figure so as to reduce the effective area 1b of the bimetallic strip 1.
  • the invention therefore proposes to extend the bimetal strip 1 to through the part of the bimetallic support 5 called the sole, while retaining a weld for example laser between the two parts, then directly solder the end 2a of the winding of the coil 2 on the non-functional part 1d bimetal, under said sole.
  • the bimetallic embedding and current conduction functions are separated.
  • the current line no longer passes through the end portion of the bimetallic having a reduced section, as is the case in the prior art.
  • the power generated by this subset is decreased.
  • the embedding height of the bimetallic strip can therefore be adjusted so as to obtain the desired thermal stroke.
  • the point of attachment of the bimetallic strip on its support is raised towards the free end of the bimetallic strip in order to shorten the useful length of the bimetallic strip.
  • this fixing point will be lowered in order to lengthen the useful length of the bimetal and increase its thermal stroke.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)

Claims (6)

  1. Vorrichtung zur Montage eines Bimetallstreifens (1) und eines Teils (5), das als Träger für diesen Bimetallstreifen (1) dient, in einer Stromunterbrechungseinheit, wobei der Bimetallstreifen (1) durch ein erstes Ende, das als freies Ende bezeichnet wird, elektrisch mit einem ersten so genannten Eingangsanschlussbereich (3), und durch ein anderes Ende, mit dem dieser Bimetallstreifen am Träger (5) befestigt ist, mit einem zweiten so genannten Ausgangsanschlussbereich (4) verbunden ist, wobei dieser Bimetallstreifen (1) so montiert ist, dass er durch den Träger (5) hindurchgeht, wobei der Bimetallstreifen somit einen ersten (1c) und einen zweiten (1d) Teil aufweist, die sich auf jeweils einer Seite des Trägers (5) befinden, wobei sich der erste Teil auf der Seite des freien Endes (1a) des Bimetallstreifens (1) befindet, die der so genannten Nutzfläche (1b) dieses Bimetallstreifens (1) entspricht, wobei die Länge dieser Nutzfläche (1b) abhängig von der Einbaulänge (I) dieses Bimetallstreifens (1) in dem Träger (5) variabel ist, dadurch gekennzeichnet, dass der Bimetallstreifen (1) so montiert ist, dass er durch den Träger (5) hindurchgeht, damit er an verschiedenen Stellen der Länge dieses Bimetallstreifens (1) befestigt werden kann, dadurch dass die Einbaulänge (I) in Abhängigkeit von der Größe des Geräts bestimmt wird, um unabhängig von der Größe ein konstantes Wärmeprofil (x) zu erhalten.
  2. Montagevorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der so genannten elektrische Ausgangsanschlussbereich (4) mit dem zweiten Teil (1d) des Bimetallstreifens (1) elektrisch verbunden ist.
  3. Montagevorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Befestigung des Bimetallstreifens (1) auf dem Träger (5) durch Schweißen erfolgt.
  4. Elektrische Schutzeinheit, umfassend eine thermische Auslösevorrichtung, die einen Bimetallstreifen (1) umfasst, dadurch gekennzeichnet, dass sie eine Vorrichtung zur Montage des Bimetallstreifens (1) auf seinem Träger (5) nach einem der Ansprüche 1 bis 3 umfasst.
  5. Elektrische Schutzeinheit nach Anspruch 4, dadurch gekennzeichnet, dass sie eine elektromagnetische Auslösevorrichtung umfasst, die eine Spule (2) umfasst, dadurch gekennzeichnet, dass diese Spule (2) ein erste Ende (2a) umfasst, das mit dem zweiten Teil des Bimetallstreifens (1d) elektrisch verbunden ist, und ein zweites Ende (2b), das mit dem Ausgangsbereich (4) elektrisch verbunden ist.
  6. Elektrische Schutzeinheit nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die elektrische Schutzeinheit ein Niederspannungs-Schutzschalter ist.
EP16194499.6A 2015-12-21 2016-10-19 Vorrichtung zur montage eines bimetallstreifens und eines teils, das einen träger dieses bimetallstreifens bildet, und elektrische schutzvorrichtung, die eine solche vorrichtung umfasst Active EP3185275B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1562925A FR3045931B1 (fr) 2015-12-21 2015-12-21 Dispositif d'assemblage d'un bilame et d'une piece formant support de ce bilame et appareil de protection electrique le comportant.

Publications (2)

Publication Number Publication Date
EP3185275A1 EP3185275A1 (de) 2017-06-28
EP3185275B1 true EP3185275B1 (de) 2018-08-01

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EP16194499.6A Active EP3185275B1 (de) 2015-12-21 2016-10-19 Vorrichtung zur montage eines bimetallstreifens und eines teils, das einen träger dieses bimetallstreifens bildet, und elektrische schutzvorrichtung, die eine solche vorrichtung umfasst

Country Status (4)

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US (1) US9916955B2 (de)
EP (1) EP3185275B1 (de)
CN (1) CN107017135B (de)
FR (1) FR3045931B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111430192A (zh) * 2020-03-25 2020-07-17 德力西电气有限公司 双金属片的有效长度可调的断路器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE462367C (de) * 1928-07-10 Voigt & Haeffner Akt Ges Anordnung zur Regelung von UEberstrom-Waermeelementen aus Bimetall mittels eines auf dem Bimetallstreifen einstellbaren Kontaktschiebers
GB2205998B (en) * 1987-05-19 1991-03-13 Crabtree Electrical Ind Ltd Temperature responsive devices
US4983939A (en) * 1989-10-05 1991-01-08 Westinghouse Electric Corp. Circuit breaker with adjustable low magnetic trip
FR2669144B1 (fr) 1990-11-08 1995-02-10 Telemecanique Assemblage d'un bilame pour appareil de coupure de courant et d'une piece servant de support au bilame.
FR2753835B1 (fr) * 1996-09-23 1998-10-30 Dispositif de declenchement thermique pour appareil de protection
EP2544206B1 (de) 2011-07-05 2016-12-14 Siemens Aktiengesellschaft Leistungsschalter

Also Published As

Publication number Publication date
FR3045931A1 (fr) 2017-06-23
CN107017135A (zh) 2017-08-04
US20170178852A1 (en) 2017-06-22
FR3045931B1 (fr) 2017-12-22
CN107017135B (zh) 2020-03-13
EP3185275A1 (de) 2017-06-28
US9916955B2 (en) 2018-03-13

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