EP0926694B1 - Magnetothermische Steuervorrichtung und mit einer solchen Vorrichtung ausgerüsteter Schutzschalter - Google Patents

Magnetothermische Steuervorrichtung und mit einer solchen Vorrichtung ausgerüsteter Schutzschalter Download PDF

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Publication number
EP0926694B1
EP0926694B1 EP98410146A EP98410146A EP0926694B1 EP 0926694 B1 EP0926694 B1 EP 0926694B1 EP 98410146 A EP98410146 A EP 98410146A EP 98410146 A EP98410146 A EP 98410146A EP 0926694 B1 EP0926694 B1 EP 0926694B1
Authority
EP
European Patent Office
Prior art keywords
heating means
bimetallic strip
circuit breaker
striker
coil
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
EP98410146A
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English (en)
French (fr)
Other versions
EP0926694A1 (de
Inventor
Jean-Louis Jacquet
Jean-Yves Amblard
Philippe Schuster
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 EP0926694A1 publication Critical patent/EP0926694A1/de
Application granted granted Critical
Publication of EP0926694B1 publication Critical patent/EP0926694B1/de
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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • 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
    • 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
    • H01H71/7409—Interchangeable elements

Definitions

  • the present invention relates to a magneto-thermal triggering device, in particular for a circuit breaker, comprising a magnetic trip unit able to trigger the circuit breaker mechanism during a sudden rise in current due to a short circuit, and a thermal trip device comprising a circuit breaker.
  • a magneto-thermal triggering device in particular for a circuit breaker, comprising a magnetic trip unit able to trigger the circuit breaker mechanism during a sudden rise in current due to a short circuit, and a thermal trip device comprising a circuit breaker.
  • bimetallic circuit capable of causing tripping of the circuit breaker mechanism in the case of a current overload resulting in a slow rise of the current.
  • a device of the kind mentioned previously described in document DE 3 637 275 is known.
  • This document describes a trigger comprising magnetic tripping means and thermal tripping means.
  • the former comprise a coil supported by a sleeve of good heat conductor closed at one of its ends, and inside which are mounted on the one hand, a so-called fixed core, fixed inside the sheath, and a said mobile core, slidably mounted inside the sleeve with interposition between the two cores, a spring.
  • a striker is slidably mounted inside the fixed core and has one end bearing on the movable core, and another end adapted to cooperate with the tripping mechanism of the circuit breaker.
  • the thermal tripping means comprise a bimetallic strip supported between one of the widened ends of the aforementioned sleeve and a capsule, said bimetal being traversed by the aforementioned striker and cooperating with a ring belonging to the striker so as to drive said striker during an overload. current.
  • the temperature rise of the bimetallic bimetallic strip is done by the coil which must first heat the aluminum sleeve and the fixed steel core, which in turn will transmit their heat to the bimetallic bimetallic strip. where a significant reaction time of the bimetal results.
  • the two electromagnetic and thermal devices being dependent, they can hardly be separated.
  • circuit breaker of the aforementioned kind described in EP-A-0 603 663 comprising a heating means traversed by the current to be monitored and capable of transmitting to the bimetal any rise in temperature corresponding to an increase in current through the heating means.
  • the present invention solves these problems and proposes a magneto-thermal triggering device of simple design, having a reduced reaction time, whose size can be easily adapted and which allows a dissociation of the two parts.
  • the present invention relates to a device according to claim 1.
  • the bimetal is directly in contact with the heating means.
  • the shape of the heating means is adapted to that of the bimetallic strip.
  • the bimetallic strip being in the form of a concave disk
  • the aforementioned heating means is also in the form of a concave disk.
  • this heating means is made of an electrically conductive material with high electrical resistivity.
  • the shape of the heating means and its thickness are adapted, depending on the size and / or the standard of the device.
  • the aforementioned heating means comprises a cutout and the shape of this cut and / or the thickness of the heating means are determined so as to give the driver an impedance adapted to different calibers and standards.
  • the material in which the driver will be made and its shaping may be determined so as to give the heating means an impedance adapted to the different calibres and standards of the device.
  • the driver being independent, the two triggers namely magnetic and thermal can be placed so as to be distant from one another.
  • the present invention also relates to a device comprising the previously mentioned features taken alone or in combination.
  • a magneto-thermal trigger D for use in a low-voltage electrical circuit breaker (not shown) to protect an electrical circuit against overloads or short circuits.
  • This circuit breaker comprises mainly, in a manner known per se, a pair of separable contacts respectively fixed and movable, a control mechanism opening and closing of the circuit breaker operated by a joystick, an electromagnetic trigger E for triggering the mechanism of the circuit breaker and thus causing the opening of the contacts during the occurrence of a short-circuit current and a thermal trigger T able to trigger the mechanism when the occurrence of a current overload.
  • the electromagnetic trigger E comprises a flange 1 on which is fixed a fixed core 2.
  • a plastic sheath 3 mounted by force around the fixed core 2
  • a coil 4 mounted around the sheath 3 and having an end 4a welded to the flange 1
  • a U-shaped casing 5 capping the coil 4, said casing 5 having in its base an orifice 6 intended to allow the introduction and sliding of a mobile core 7, said carcass 5 also having around this orifice 6 an annular recess 8 intended to receive the one 3b of the ends of the aforementioned sleeve 3, and being welded to the flange 1 by the free end 5a of one of his two wings.
  • This movable core 7 is secured by its end 7a located inside the sleeve 3, at one end 9a of a striker 9 slidably mounted inside the fixed core and whose opposite end 9b is intended for cooperate with a percussion lever 10 (fig.1 and 2) capable of triggering the mechanism and striking the movable contact.
  • the fixed core 2 comprises a recess 13 (FIG. 1) adapted to receive, by one of these ends 12b, a spring 12 mounted around the striker 9 and whose other end 12a bears on the mobile core 7. It will be noted that this striker 9 is crimped in an orifice 7b of the movable core 7 in order to avoid parasitic clearances.
  • This spring 12 is intended to return the movable core 7 in the rest position as illustrated in FIGS.
  • the assembly comprising the sheath 3, the coil 4 and the two cores 2 and 7 is mounted inside a carcass 5 having at one of these ends an orifice 6 for passage of the movable core 7 and closed at its opposite end by a flange 1, said flange 1 being electrically connected firstly to the coil 4 and secondly to the heating means 16 of the coil.
  • the thermal part T of the magneto-thermal release comprises a so-called upper capsule 14 having a recess 14a adapted to receive a so-called bimetal strip 15 constituted by a curved disc towards the side opposite to the capsule in the rest position, a so-called driver element 16 comprising a disk, one of whose faces 16a (FIG. 3) has a curved shape corresponding to the curved shape of the bimetallic strip 15, said driver 16 also comprising a radial slot 17 whose function will be explained later on as well as two lugs 18, 19s extending substantially perpendicularly to the plane of the aforementioned disk in two opposite directions.
  • the thermal release further comprises a so-called lower capsule 20 in the form of a plate, said capsule being intended to be fixed on the driver element 16 by one of these faces and comprising a central orifice 20a in which the stud 2a associated with the core fixed 2 is mounted by force to achieve the attachment of the thermal part on the magnetic part.
  • FIGS. 1 and 2 show in particular that the bimetallic strip and the heating means are trapped between the lower cap 20 supporting the heating means 16 and the upper cap 14 comprising the recess 14a, said recess 14a having a rim circumferential 14b, said bimetal 15 being immobilized between this rim 14b and the circumferential edge 16b of the heating means 16.
  • the face 16a of the driver element 16, which is intended to be in contact with the bimetallic strip 15, is adapted to that of the bimetallic strip 15 so that the total surface of the bimetallic strip is in contact with the driver element in the rest position trigger.
  • the disk constituting the bimetallic strip 15 is made of a temperature-sensitive material such that the shape of the bimetallic strip changes as a result of a change in temperature.
  • trigger temperature a so-called trigger temperature
  • orifices 17,15a are provided respectively in the driver element 16, the bimetallic strip 15 and the upper cap 14 and are intended to allow the passage of the striker 9 and allow its sliding through these elements.
  • the driver 16 may include a cutout 17 (opening) whose size is determined according to the size of the circuit breaker. Indeed, the shape of the driver 16, its dimensions and the material in which it is made, can be determined so as to impart an impedance adapted to different calibers and different standards of the devices.
  • the driver 16 presents an elongated opening 17 extending substantially from the center to the outer diameter of the disk and having a width substantially corresponding to the spacing of two lugs 18,19.
  • the resistance of the driver 16 is proportional to the length of the current path between the two ranges 18,19 and the resistance of the material, but is inversely proportional to the width l of the track. In fig.
  • the disk has an opening 17 extending radially from the outer edge of the disk over half of its radius, and this over a circumferential length corresponding substantially to half of the previous one.
  • no opening is provided except that for the passage of the firing pin.
  • the value of the resistance of the first driver shown in FIG. 8 is smaller than that of the second driver shown in FIG. 9, which is less than that of the driver illustrated in FIG.
  • the bimetallic strip 15 and the striker 9 cooperate respectively with two perpendicular arms 10b, 10a belonging to a return lever 10 controlling the trigger bar of the circuit breaker, the arm 10b cooperating with the bimetallic strip 15 passing through the upper capsule 14.
  • the device of the invention is in the rest position corresponding to a normal operation of the apparatus during which the current (I in FIG 3) flows through the coil 4 and then through the flange 1, then reached the driver 16 by one 18 of its ranges 18,19, and joined the other 19 of the driver's beaches by circulating around the cutout 17, after which the current reaches the moving contact, in electrical contact with the fixed contact (not shown).
  • a magnetic field is generated by the coil 4.
  • a magnetic threshold is reached, which causes the displacement of the core 7 in the direction of the fixed core 2 as illustrated in Figures 4 and 5.
  • the core-striker assembly then strikes the return lever 10, which goes at first, after a certain travel movement of the lever act on the trigger bar for controlling the triggering of the mechanism and in a second step, after an additional displacement stroke of the lever, act on the movable contact to cause the sudden opening of the contacts.
  • the striker performs two functions because, on the one hand, it acts on the triggering mechanism and, on the other hand, it exerts a percussion on the moving contact, to give it a large opening force on short circuit.
  • bimetal 15 directly hits the return lever 10 which will act on the trip bar of the circuit breaker and cause a trigger mechanism.
  • the driver 16 will be made of a special electrically conductive alloy having a high resistivity such as stainless steel, while the lower and upper capsules are advantageously made of plastic.
  • the insulating sheath can be made of plastic.
  • heating means will not necessarily be in direct contact with the bimetallic strip, but that an air film or the like may be interposed between the bimetallic strip and the heating means.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Claims (16)

  1. Magnetothermische Auslöseeinrichtung, insbesondere für einen Leistungsschalter, welche Einrichtung einen Magnetauslöser E, der in der Lage ist, bei einem sprunghaften Anstieg des Stroms, beispielsweise als Folge eines Kurzschlusses eine Auslösung des Schaltmechanismus' des Leistungsschalters D zu bewirken, sowie einen thermischen Auslöser T mit Bimetall umfasst, der in der Lage ist, eine Auslösung des Schaltmechanismus' des Leistungsschalters bei einer Überlast und einem daraus folgenden langsamen Anstieg des Stroms zu bewirken, welcher thermische Auslöser T ein Heizelement (16) zur Erwärmung des Bimetalls (15) umfasst, das von dem zu überwachenden Strom durchflossen wird und in der Lage ist, jede einem Anstieg des Stroms im Heizelement (16) entsprechende Erhöhung der Temperatur auf das Bimetall (15) zu übertragen, dadurch gekennzeichnet, dass das genannte Heizelement (16) vom Magnetauslöser unabhängig sowie austauschbar ist, um über seine Impedanz an den Nennstrom und/oder die Normwerte des Schaltgeräts angepasst werden zu können.
  2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Bimetall (15) direkt auf dem Heizelement (16) aufliegt oder durch eine Luftschicht vom Heizelement (16) getrennt ist.
  3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Form des Bimetalls (15) an die Form des Heizelements (16) angepasst ist.
  4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, dass bei Ausbildung des Bimetalls (15) als konkave Scheibe das genannte Heizelement (16) annähernd die Form einer konkaven Scheibe mit zwei Anschlussfahnen (18, 19) aufweist.
  5. Einrichtung nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das genannte Heizelement (16) aus einem elektrisch leitenden Material mit einem hohen spezifischen elektrischen Widerstand besteht.
  6. Einrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Heizelement (16) bezüglich seiner Form und seiner Dicke an den Nennstrom und/oder die Normwerte des Schaltgeräts angepasst ist.
  7. Einrichtung nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass im genannten Heizelement (16) ein Ausschnitt (17) ausgebildet ist und dass die Form des Ausschnitts (17) und/oder die Dicke des genannten Heizelements (16) so ausgelegt sind, dass sie dem genannten Heizelement (16) eine an die jeweiligen Nennstrom- oder Normwerte des Schaltgeräts angepasste Impedanz verleihen.
  8. Einrichtung nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei Ausführung des Magnetauslösers mit einen Schlagstift (9), der in der Lage ist, bei einem schnellen Anstieg des Stroms die Auslösung des Schaltmechanismus' zu bewirken, das Heizelement (16) und das Bimetall (15) zwei einander gegenüberliegende Öffnungen (17, 15a) aufweisen, welche die Durchführung des Schlagstifts (9) erlauben, wobei der genannte Schlagstift (9) in der Lage ist, mit einem die Auslösung des Schaltmechanismus' steuernden Hebel (10) oder ähnlichen Teil zusammenzuwirken
  9. Einrichtung nach irgendeinem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Bimetall (15) bei Auftreten einer Überlast direkt auf einen Umlenkhebel (10) wirkt, der die Auslösewelle des Leistungsschalters betätigt.
  10. Einrichtung nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Bimetall (15) und das Heizelement (16) zwischen einer, das Heizelement (16) tragenden unteren Kapsel (20) und einer, eine Ausnehmung (14a) aufweisenden oberen Kapsel (14) eingeschlossen sind, wobei die genannte Ausnehmung einen umlaufenden Rand (14b) aufweist und das genannte Bimetall (15) zwischen diesem umlaufenden Rand (14b) und dem umlaufenden Rand (16b) des Heizelements (16) gehalten wird.
  11. Einrichtung nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie eine von dem zu überwachenden Strom durchflossene und auf einem Tragkörper (3) gehalterte Spule (4), einen im Tragkörper (3) befestigten, feststehenden Kern (2) sowie einen im Tragkörper (3) gleitend gelagerten und mit einem Ende eines Schlagstifts (9) fest verbundenen beweglichen Kern (7) umfasst, wobei der genannte Schlagstift (9) den feststehenden Kern (2) gleitend durchragt und dazu ausgelegt ist, als Folge einer Änderung des von der Spule erzeugten Magnetfelds durch den beweglichen Kern geradlinig verschoben zu werden, und die genannte Spule mit dem genannten Heizelement (16) elektrisch verbunden ist.
  12. Einrichtung nach Anspruch 11, dadurch gekennzeichnet, dass die aus der Spule (4), dem Tragkörper (3) und den beiden Kernen (2, 7) bestehende Einheit in einem Rahmen (5) montiert ist, der an einem seiner Enden eine Durchführungsöffnung (6) für den beweglichen Kern (7) aufweist und an seinem gegenüberliegenden Ende durch einen Flansch (1) verschlossen ist, welcher Flansch (1) einerseits mit der Spule (4) und andererseits mit dem Heizelement (16) der Spule (4) elektrisch verbunden ist.
  13. Einrichtung nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass am Heizelement (16) zwei Fahnen (18, 19) ausgebildet sind, die annähernd rechtwinklig zur Ebene des Heizelements (16) in jeweils entgegengesetzter Richtung verlaufen, welche Fahnen mit dem Flansch (1) bzw. mit dem beweglichen Kontakt elektrisch verbunden sind.
  14. Einrichtung nach irgendeinem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass das Bimetall (15) und der Schlagstift (9) mit zwei, annähernd senkrecht zueinander stehenden Armen (10a bzw. 10b) eines die Auslösung des Leistungsschalters steuernden Umlenkhebels (10) zusammenwirken, wobei der mit dem Bimetall (15) zusammenwirkende Arm (10b) die obere Kapsel (14) durchragt.
  15. Einrichtung nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Bimetall bei Auftreten eines Überlaststroms umschnappt und dadurch eine Schlagwirkung auf den Umlenkhebel (10) ausübt, während der Schlagstift bei Auftreten eines Kurzschlusses den Unlenkhebel (10) schlägt, der in einer ersten Phase den Schaltmechanismus auslöst und in einer zweiten Phase auf den beweglichen Kontakt wirkt, um diesen mit einer großen Kurzschluss-Ausschaltkraft zu beaufschlagen.
  16. Leistungsschalter mit einer magnetischen Auslöseeinrichtung nach irgendeinem der Ansprüche 1 bis 15.
EP98410146A 1997-12-19 1998-12-14 Magnetothermische Steuervorrichtung und mit einer solchen Vorrichtung ausgerüsteter Schutzschalter Expired - Lifetime EP0926694B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9716543 1997-12-19
FR9716543A FR2772980B1 (fr) 1997-12-19 1997-12-19 Dispositif de declenchement magneto-thermique et disjoncteur equipe de ce dispositif

Publications (2)

Publication Number Publication Date
EP0926694A1 EP0926694A1 (de) 1999-06-30
EP0926694B1 true EP0926694B1 (de) 2007-02-07

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EP98410146A Expired - Lifetime EP0926694B1 (de) 1997-12-19 1998-12-14 Magnetothermische Steuervorrichtung und mit einer solchen Vorrichtung ausgerüsteter Schutzschalter

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EP (1) EP0926694B1 (de)
AT (1) ATE353470T1 (de)
DE (1) DE69837032T2 (de)
FR (1) FR2772980B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19914479A1 (de) * 1999-03-30 2000-10-05 Kopp Heinrich Ag Thermische Auslöseeinrichtung für Leitungsschutzschalter
JP5276523B2 (ja) * 2009-06-08 2013-08-28 三菱電機株式会社 回路遮断器
CN108550496B (zh) * 2018-07-02 2023-08-01 江苏双汇电力发展股份有限公司 10kV高压电动真空保护开关
CN114267568B (zh) * 2022-03-02 2022-05-20 晟望电气有限公司 户外电力保护开关

Family Cites Families (6)

* 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
DE3637275C1 (en) * 1986-11-03 1988-05-05 Flohr Peter Overcurrent trip device for protection switching apparatuses
DE4242516A1 (de) * 1992-12-16 1994-06-23 Abb Patent Gmbh Thermischer und elektromagnetischer Auslöser
DE4313207A1 (de) * 1993-04-22 1994-10-27 Kopp Heinrich Ag Leitungsschutzschalter
DE4336073A1 (de) * 1993-10-22 1995-04-27 Abb Patent Gmbh Thermischer Überstromauslöser für ein elektrisches Schaltgerät
DE9406806U1 (de) * 1994-04-23 1995-06-01 Thermik Gerätebau GmbH, 75181 Pforzheim Bimetallschalter, insbesondere stromabhängiger Schalter

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DE69837032T2 (de) 2007-07-05
DE69837032D1 (de) 2007-03-22
FR2772980A1 (fr) 1999-06-25
EP0926694A1 (de) 1999-06-30
ATE353470T1 (de) 2007-02-15
FR2772980B1 (fr) 2000-01-21

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