EP3161850B1 - Thermisch-magnetischer auslösungsmechanismus - Google Patents

Thermisch-magnetischer auslösungsmechanismus Download PDF

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Publication number
EP3161850B1
EP3161850B1 EP15748274.6A EP15748274A EP3161850B1 EP 3161850 B1 EP3161850 B1 EP 3161850B1 EP 15748274 A EP15748274 A EP 15748274A EP 3161850 B1 EP3161850 B1 EP 3161850B1
Authority
EP
European Patent Office
Prior art keywords
armature
circuit
solenoid
trigger
thermal
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
EP15748274.6A
Other languages
English (en)
French (fr)
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EP3161850A1 (de
Inventor
Francis Deckert
Thierry LOUX
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 EP3161850A1 publication Critical patent/EP3161850A1/de
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Publication of EP3161850B1 publication Critical patent/EP3161850B1/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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic 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
    • H01H71/10—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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H2071/249—Electromagnetic mechanisms with part of the magnetic circuit being in the normal current path in the circuit breaker, e.g. yoke, fixed contact and arc-runner are made out of one single conductive element

Definitions

  • the present invention relates to a magnetothermal trip unit in general, more particularly intended for an electrical appliance, particularly of the circuit-breaker type, and designed to provide protection by opening at least one electric line in the event of a fault resulting in a rapid rise of the current , for example following a short circuit, or slow in case of overload in the circuit.
  • the invention also relates to electrical apparatus which is provided with such a magnetothermal release.
  • a magnetothermal trip unit conventionally comprises, as is known from the document FR 2 943 455 a movable pallet magnetic circuit pivotable relative to a fixed armature forming the remainder of the magnetic circuit, said armature being in U section and surrounding a thermal bimetallic strip electrically connected to a terminal of the apparatus, biasing means holding the vane in open position relative to the armature in the absence of short circuit current.
  • the current is sufficient for the magnetic force induced in the magnetic circuit to cause the moving vane to move, against the return means, allowing the lock of the device to be tripped, and therefore the opening of the main contacts of the device.
  • the magnetic trip device In the case of a circuit breaker having to operate at low short-circuit currents, of the order of a few tens or hundreds of amperes, the magnetic trip device conventionally comprises a solenoid from which it is possible to vary the number of turns for increase / decrease the length of the solenoid according to the short circuit current that it must support, and to allow to easily adjust the number of amperes / revolution according to the nominal current.
  • This type of magnetic release consists of a set of fixed core / core movable in translation in a magnetically actuated magnetic armature under the effect of the solenoid traversed by the short-circuit current, said movable core resulting in a mechanical means capable of actuate a trip bar to trigger the mechanical lock of the circuit breaker.
  • the thermal release is classically a bimetallic strip.
  • resistors To withstand the important thermal stresses when the ultimate or service short-circuit currents are high, of the order of several thousand amperes, it is customary to add, in series, in the current path, resistors. which make it possible to increase the total impedance of the circuit-breaker and to limit the current flowing through it in the event of a short-circuit.
  • resistors consume volumes, and their integration into the current compact devices is problematic.
  • Another solution of the prior art consists in combining the impedance of the magnetothermal release with that of other parts of the circuit breaker contributing to increase the impedance, for example the interrupting chamber with the fixed and moving contacts.
  • the total impedance of the circuit breaker then makes it possible to limit the short-circuit current, but does not allow magnetic tripping at low short-circuit currents.
  • the document US 2013/0093541 A1 discloses a magnetothermal release according to the preamble of claim 1.
  • the document DE 3333792 A1 discloses a magnetic trigger having a conductive part (6) in series with the current path of the trigger, said part surrounding the solenoid of the trigger.
  • the object of the present invention is to design a magnetothermal trip unit, able to perform its magnetic and thermal tripping functions in a device that must trip at low short-circuit currents, with a sufficient impedance to withstand short-circuit currents. ultimate or service, and miniaturized to be integrated into compact devices of the latest generation.
  • This magnetothermal trigger also includes means for increasing the impedance of the circuit, which consist of a magnetic armature connected in series with the current path of the trip between the solenoid and the bimetallic strip.
  • the main idea of this invention is to increase the impedance of the trigger by means of a single piece, playing on its dimensions, its positioning within the trigger, its arrangement with the other parts of the trigger, and finally its material.
  • the armature is a piece conventionally used in magnetic movable pallet releases. Such an armature is reused in the magnetic release of the invention which, in this case, does not work with a mobile pallet, but with a mobile core.
  • the frame is a metal part that can take many forms, and therefore integrate easily into a trigger, unlike additional resistors that are in addition to the current path and require additional volume.
  • said armature surrounds the solenoid by forming a loop around the solenoid, and is connected in the upper part to the solenoid and in the lower part to the bimetal.
  • the shape of the armature is therefore intended to marry the outer shape of the solenoid, and thus minimize the space available within the device.
  • the upper part of the armature comprises an upper face of which exceeds a connection tab to the solenoid.
  • the lower part of the armature comprises a connection tab bimetal located under, away from, and oriented perpendicularly to a lower face of the frame, and attached to an extension of a side face of the frame.
  • the armature forms a four-sided rectangular loop, said extension of one of the lateral faces for the attachment of the tab being located at a first angle of the loop, and said tongue protrudes from the armature at a second angle of the loop opposite the first angle.
  • the tongue and the tab are thus arranged on the armature so as to be at most away from each other, so that the current has a maximum path to go in the armature.
  • the current that comes through the tongue divides into the two branches of the loop, and is joined at the level of the leg.
  • the leg of the armature is provided with bi-metal fixation holes and forms an L with said extension of the lateral face of the armature. This shape allows to orient the bimetal so that its direction of deflection is perpendicular to the trip bar.
  • the current path in the trip unit travels successively through an input terminal of the trip unit, the solenoid, the armature, the bimetallic strip, a braid, and an output terminal of the trip unit.
  • the braid is either connected directly to the bimetallic strip, or via an intermediate support that can also be chosen in a highly resistive material, to increase the impedance.
  • the use of a flexible braid allows deflection of the bimetal to actuate the trigger bar.
  • the input terminal is connected to a first end of the solenoid, the second end of the solenoid being connected to the tongue of the armature, the leg of the armature being connected to the base of the bimetallic strip, the braid connecting the head bimetallic to the output terminal.
  • the invention also relates to a circuit breaker type electrical protection device comprising a magnetothermal trip device as described above.
  • the magnetothermal release according to the invention has a space equivalent to a conventional magnetothermal release for higher short-circuit currents, with a U-shaped magnetic yoke associated with a movable pallet .
  • This means that the same circuit breaker can optionally contain either a trigger according to the invention used for low short-circuit currents, or a conventional trigger used for high short-circuit currents.
  • the magnetothermal release as illustrated in Figures 1 and 2 consists of a thermal actuator having a bimetal (21) responsive to a rise in temperature, and a magnetic actuator conventionally comprising a solenoid (10) surrounding a fixed core (13) and a movable core (14).
  • the movable core (14) is guided in translation in a liner of insulating material (15), is located against the fixed core (13) in normal operation, and is driven away from the fixed core (13) via a magnetic field generated by the solenoid (10) when a short circuit occurs.
  • a magnetic armature (1) which at least partially envelops the solenoid (10).
  • This magnetic armature (1) is represented more precisely in figure 3 .
  • the main part of the armature (1) forms a four-sided rectangular shape loop (5, 4, 9, 8).
  • a tab (2) extends from the upper face (4) of the armature (1) at an angle (37), while a tab (3) develops under the lower face (8) of the frame (1).
  • This lug (3) is attached to the buckle of the armature (1) via an extension (6) of a lateral face (5) of the armature (1) developing at another angle (36) diametrically opposed to the angle (37) of the loop.
  • the tab (3) thus extends perpendicular to both the extension (6) and the lower face (8) of the armature, and is spaced from the lower face (8). It comprises two orifices (7) allowing it to be attached to a part of the trigger, in this case the bimetallic strip (21).
  • this magnetic armature (1) is illustrated with the presence of the solenoid (10).
  • the latter has a shape preferentially rectangular to minimize its depth dimension to leave enough room for bimetallic (21) located just behind.
  • the armature (1) is a piece that has been added to increase the length of the current path. This current path is illustrated in figure 5 especially.
  • the arrows in bold illustrate the flow of the current in the magnetothermal trip unit.
  • the current enters the trigger via the input terminal (19), one of the branches (20) is welded to a first end (11) of the solenoid (10).
  • the current then enters the solenoid (10), runs entirely to its second end (12) which is, in turn, welded to the tongue (2) of the frame (1).
  • the current then enters the armature (1) via the tongue (2) and then distributes itself in the loop of the armature (1) homogeneously until it reaches the extension (6) of the lateral face (5). then finally in the paw (3).
  • the fact that the tab (3) is spaced from the loop of the armature (1) further increases the path of the current path since the current must still flow in the extension (6) before reaching the leg (3).
  • This lug (3) is fixed to the foot (22) of the bimetallic strip (21) by two rivets (24).
  • the current thus passes from the lug (3) of the armature (1) to the bimetallic strip (21) and then runs along all the bimetallic strip (21), from its foot (22) to its head (23) on which is fixed a support (25) to which braids (26, 27) are welded.
  • an output terminal (28) of the magnetothermal release To one of these braids (26, 27) is soldered an output terminal (28) of the magnetothermal release.
  • the current thus arriving at the head (23) of the bimetallic strip (21) passes via the braid (26) into the output terminal (28).
  • This specific configuration of the magnetothermal release allows to considerably increase the path to be traversed by the current. This increase is allowed by the addition of the magnetic armature (1), as well as by the specific arrangement of the bimetallic strip (21) within the trigger. Indeed, the current passes from the foot (22) of the bimetallic strip (21) to the head (23) of the bimetallic strip (21), which adds length.
  • the magnetothermal trip device thus makes it possible to considerably increase the impedance within the device in which it can be put in place.
  • it may be for example a circuit breaker, as illustrated in FIG. Figures 6 and 7 .
  • the magnetic armature (1) takes up very little space because of its specific shape and positioning within the magnetothermal release. It fills the solenoid and intelligently bridges the free space between the solenoid and other trigger components.
  • the magnetic actuator will drive the mobile core (14) in translation.
  • the latter then actuates a reference (16) (see Figures 1 and 2 ) rotatable on an axis (17) of a bearing (18) fixed on the upper face (4) of the armature (1).
  • This reference (16) rotates a trigger bar (29), in particular visible in figure 6 , which actuates a lock allowing the opening of the circuit-breaker in the event of a short-circuit.
  • the bimetallic strip (21) actuates the same trip bar in case of overload via the calibration screw (30) also visible in figure 6 .
  • the bimetal head (23) will have a tendency to bend until it bears against the screw (30).
  • the figure 7 thus illustrates a circuit breaker provided with the magnetothermal release according to the invention.
  • the fixed (32) and movable (33) contacts are closed in the interrupting chamber (31).
  • the current flows through the contacts (32, 33) and the bridge (35) to a link (34) attached to the input terminal (19) of the magnetothermal trip unit.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Claims (6)

  1. Thermisch-magnetischer Auslösungsmechanismus für eine elektrische Trennvorrichtung vom Typ eines Schutzschalters, umfassend:
    - einen magnetischen Betätiger, der aus einem Solenoid (10) besteht, das in Serie in der Schaltung angeordnet ist, das einen festen Kern (13) und einen bewegbaren Kern (14) umgibt und das den bewegbaren Kern (14) zwischen zwei Positionen antreibt, die zwei Zustände, jeweils inaktiv und aktiv, des Betätigers im Fall eines Kurzschlusses darstellen;
    - einen thermischen Betätiger, der ein verformbares Bimetall (21) aus einem wärmeempfindlichen Material umfasst, welches geeignet ist, von einer anfänglichen Form in eine Endform überzugehen, die zwei Zustände, jeweils inaktiv und aktiv, des Betätigers unter der Einwirkung des Erhitzens darstellen, das in dem thermischen Betätiger im Fall einer Überladung erzeugt wird;
    dadurch gekennzeichnet, dass dieser auch Mittel zur Erhöhung der Impedanz der Schaltung umfasst, dadurch, dass die Mittel zur Erhöhung der Impedanz der Schaltung aus einem Magnetanker oder Magnetarmatur (1) bestehen, der in Serie mit dem Stromweg des Auslösungsmechanismus zwischen dem Solenoid (10) und dem Bimetall (21) verbunden ist, dadurch, dass der besagte Anker oder Armatur (1) das Solenoid (10) unter Bildung einer Schleife um das Solenoid (10) umgibt, und am oberen Teil mit dem Solenoid (10) und am unteren Teil mit dem Bimetall (21) verbunden ist,
    dadurch, dass der obere Teil des Ankers oder Armatur (1) eine obere Fläche (4) umfasst, über die eine Lasche (2) zur Verbindung mit dem Solenoid (10) hinausgeht,
    dadurch, dass der untere Teil des Ankers oder Armatur (1) einen Ansatz (3) zur Verbindung mit dem Bimetall (21) umfasst, der unter, in einem Abstand von, und rechtwinklig orientiert zu, einer unteren Fläche (8) des Ankers oder Armatur (1) angeordnet ist, und an einer Verlängerung (6) einer Seitenfläche (5) des Ankers oder Armatur (1) angebracht ist, und
    dadurch, dass sich der Strom, der durch die Lasche (2) ankommt, in zwei Zweige der Schleife teilt, und sich auf der Ebene des Ansatzes (3) wieder vereint.
  2. Thermisch-magnetischer Auslösungsmechanismus für eine elektrische Trennvorrichtung vom Typ eines Schutzschalters nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Anker oder Armatur (1) eine Schleife mit rechteckigem Aussehen mit vier Flächen (5, 4, 9, 8) bildet, wobei die Verlängerung (6) einer der Seitenflächen zum Anbringen des Ansatzes (3) auf der Ebene eines ersten Winkels (36) der Schleife angeordnet ist, und wobei die Lasche (2) über den Anker oder Armatur (1) auf der Ebene eines zweiten Winkels (37) der Schleife gegenüber dem ersten Winkel (36) hinausgeht.
  3. Thermisch-magnetischer Auslösungsmechanismus für eine elektrische Trennvorrichtung vom Typ eines Schutzschalters nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Ansatz (3) des Ankers oder Armatur (1) mit Öffnungen (7) zur Befestigung an dem Bimetall (21) versehen ist, und ein L mit der Verlängerung (6) der Seitenfläche (5) des Ankers oder Armatur (1) bildet.
  4. Thermisch-magnetischer Auslösungsmechanismus für eine elektrische Trennvorrichtung vom Typ eines Schutzschalters nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Weg des Stroms im Inneren des Auslösungsmechanismus aufeinanderfolgend durch eine Eingangsklemme (19) des Auslösungsmechanismus, das Solenoid (10), den Anker oder Armatur (1), das Bimetall (21), eine Litze (26) und eine Ausgangsklemme (28) des Auslösungsmechanismus verläuft.
  5. Thermisch-magnetischer Auslösungsmechanismus für eine elektrische Trennvorrichtung vom Typ eines Schutzschalters nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Eingangsklemme (19) mit einem ersten Ende (11) des Solenoids (10) verbunden ist, wobei das zweite Ende (12) des Solenoids (10) mit der Lasche (2) des Ankers oder Armatur (1) verbunden ist, wobei der Ansatz (3) des Ankers oder Armatur (1) mit dem Fuß (22) des Bimetalls (21) verbunden ist, wobei die Litze (26) den Kopf (23) des Bimetalls (21) mit der Ausgangsklemme (28) verbindet.
  6. Elektrische Leitungsschutzvorrichtung vom Typ eines Schutzschalters, umfassend einen thermischmagnetischen Auslösungsmechanismus nach einem der vorhergehenden Ansprüche.
EP15748274.6A 2014-06-30 2015-06-23 Thermisch-magnetischer auslösungsmechanismus Active EP3161850B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1456141A FR3023057B1 (fr) 2014-06-30 2014-06-30 Declencheur magnetothermique.
PCT/FR2015/051682 WO2016001524A1 (fr) 2014-06-30 2015-06-23 Déclencheur magnétothermique

Publications (2)

Publication Number Publication Date
EP3161850A1 EP3161850A1 (de) 2017-05-03
EP3161850B1 true EP3161850B1 (de) 2019-09-18

Family

ID=52003908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15748274.6A Active EP3161850B1 (de) 2014-06-30 2015-06-23 Thermisch-magnetischer auslösungsmechanismus

Country Status (5)

Country Link
EP (1) EP3161850B1 (de)
JP (1) JP6693890B2 (de)
CN (1) CN107004545B (de)
FR (1) FR3023057B1 (de)
WO (1) WO2016001524A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11422202B2 (en) 2020-08-11 2022-08-23 Siemens Industry, Inc. Overload current detection in a circuit interrupting device

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Publication number Priority date Publication date Assignee Title
US3117203A (en) * 1960-05-17 1964-01-07 Gen Electric Circuit protective devices and circuits
US3264427A (en) * 1962-04-16 1966-08-02 Gen Electric Electric circuit protective device with energy diverting means
DD211668A1 (de) * 1982-11-11 1984-07-18 Elektroinstallation Annaberg V Leitungsschutzschalter mit einer eine blasschleife bildenden kontaktanordnung
EP0143022B1 (de) * 1983-10-21 1988-06-01 Merlin Gerin Thermischer und magnetischer Auslöser für Selbstschalter
JPS60150759U (ja) * 1984-03-16 1985-10-07 松下電工株式会社 過電流検出装置
EP1548773B1 (de) * 2003-12-22 2008-03-26 ABB Schweiz AG Lichtbogenlöscheinrichtung für Schutzschalter mit Doppelunterbrechung
CN1855340A (zh) * 2005-04-27 2006-11-01 陈景正 断路器电磁式脱扣机构
CN2870150Y (zh) * 2005-09-27 2007-02-14 宁波奇乐电器实业总公司 低压断路器过电流脱扣器
FR2943455B1 (fr) * 2009-03-23 2011-05-06 Hager Electro Sas Declencheur magnetothermique
CN201478231U (zh) * 2009-08-06 2010-05-19 长城电器集团有限公司 一种新型的小型断路器的热磁系统
FR2958447B1 (fr) * 2010-04-02 2012-05-04 Schneider Electric Ind Sas Declencheur electromagnetique pour appareil electrique interrupteur, appareil electrique interrupteur comportant un tel declencheur
EP2544207B1 (de) * 2011-07-05 2017-03-29 Siemens Aktiengesellschaft Kurzschlussauslöser mit optimierter Spulenanbindung
CN203386690U (zh) * 2013-06-07 2014-01-08 江苏大全凯帆电器股份有限公司 加强绝缘的低压断路器脱扣器

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
EP3161850A1 (de) 2017-05-03
WO2016001524A1 (fr) 2016-01-07
JP2017520889A (ja) 2017-07-27
CN107004545B (zh) 2020-01-14
JP6693890B2 (ja) 2020-05-13
CN107004545A (zh) 2017-08-01
FR3023057A1 (fr) 2016-01-01
FR3023057B1 (fr) 2016-07-22

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