EP0013642B1 - Strombegrenzender Selbstschalter für Niederspannung - Google Patents

Strombegrenzender Selbstschalter für Niederspannung Download PDF

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Publication number
EP0013642B1
EP0013642B1 EP19800400014 EP80400014A EP0013642B1 EP 0013642 B1 EP0013642 B1 EP 0013642B1 EP 19800400014 EP19800400014 EP 19800400014 EP 80400014 A EP80400014 A EP 80400014A EP 0013642 B1 EP0013642 B1 EP 0013642B1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
switch
contact
cheeks
cage
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
Application number
EP19800400014
Other languages
English (en)
French (fr)
Other versions
EP0013642A1 (de
Inventor
Yves Pelenc
Pierre Schueller
Claude Terracol
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
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 Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0013642A1 publication Critical patent/EP0013642A1/de
Application granted granted Critical
Publication of EP0013642B1 publication Critical patent/EP0013642B1/de
Expired 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2472—Electromagnetic mechanisms with rotatable armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/107—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by the blow-off force generating means, e.g. current loops
    • H01H77/108—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by the blow-off force generating means, e.g. current loops comprising magnetisable elements, e.g. flux concentrator, linear slot motor
    • 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

Definitions

  • the invention relates to a low-voltage limiting circuit breaker comprising, by pole, a fixed contact cooperating in the closing position of the circuit breaker with a movable contact coupled to a manual and / or automatic operating mechanism for opening and closing the circuit breaker and a trip device electromagnetic device cooperating with said mechanism for tripping the circuit breaker and opening the contacts when the fault current detected by the electromagnetic trip device exceeds a first threshold, said trip device comprising an excitation coil with an axial magnetic core traversed by said fault current and a magnetic circuit having a movable pallet separated by a first air gap of two fixed yokes in the form of parallel cheeks framing the coil with core perpendicular to the cheeks and cooperating with the movable pallet to move the latter in the release position when said first threshold is exceeded, said cheeks defining a second air gap in which extends a part of the movable contact in the closed position of the contacts.
  • the yokes of the magnetic circuit of the electromagnetic trip device constitute blown arc flanges.
  • the cheeks frame the fixed and mobile contacts and the arc development area and their spacing is important. They are therefore unable to exert a significant force on the movable contact, the end of which penetrates between the cheeks and the opening of the circuit breaker on fault results from the detection of this fault by the trip device and from the unlocking of the operating mechanism. .
  • the circuit breaker opens with a certain delay preventing any limitation of the current.
  • the object of the invention is to make use of the third technique by the use of simple and compact means.
  • the circuit breaker according to the invention is characterized in that the ends of the cheeks are folded at right angles, thus defining the second thin air gap, through which extends, in the closed position of the contacts, a conductive tab belonging to the contact, movable in a direction perpendicular to the length and the tongue and parallel to the cheeks, so that the magnetic flux, generated in said air gap by the fault current flowing through the coil, when this current exceeds a second threshold greater than said first threshold, causes a electrodynamic effect of rapid displacement of the movable contact in the open position.
  • the small air gap makes it possible to have sufficient magnetic flux to move the movable contact to the open position before unlocking the mechanism and it is unnecessary to recall the operation which is described in detail in the aforementioned French patents of the applicant.
  • the force exerted on the movable contact can be a Laplace force resulting from the interaction of the current flowing through the contact and the magnetic field in the air gap.
  • the repulsion threshold of the movable contact is greater than the trigger threshold of the trigger, so as to avoid a critical zone of contact beats.
  • a low-voltage circuit breaker with high breaking capacity comprises a molded housing 10 formed by two half-shells 12, 14 made of insulating material.
  • the housing 10 contains a cut-off device 16, an operating mechanism 17 with manual control lever (not shown), a bimetal thermal trip device 18 and an instantaneous electromagnetic trip device 20 cooperating with the mechanism 17 when a overload or short-circuit current to actuate the moving element to the open position.
  • the magnetic circuit 22 of the electromagnetic trip device 20 comprises two yokes or cheeks 24, 26 parallel to the side walls of the housing 10 and joined together by a transverse core 28 on which is wound a coil 30 of the trip device 20.
  • the core 28 extends perpendicularly to the walls of the housing 10 and is subject to cylinder heads 24, 26 by any suitable fixing method, in particular by riveting or crimping.
  • Two air gaps e 1 and e 2 are arranged between the upper ends of the cylinder heads 24, 26 and a movable triggering pallet 32 disposed above the coil 30 opposite the cut-off device 16.
  • the pallet 32 is constituted by a ferromagnetic U-shaped stirrup 33, pivotally mounted on an axis 34, and biased by a return spring 36 towards a spaced-apart rearming position.
  • the stirrup 33 is provided with a finger 38 capable of actuating an unlocking pusher 40 when the coil 30 is excited.
  • the lower ends of the yokes 24, 26 of the magnetic circuit 22 are bent at right angles and directed towards each other parallel to the bottom 46 of the housing 10, being separated by a transverse air gap 3 .
  • the breaking device 16 comprises a movable bridge 48 with movable contacts cooperating in the closed position with two fixed contacts 50, 52 conjugated respectively connected to a supply terminal 54, and to the coil 30 of the trip device 20.
  • the bridge 48 is provided a tongue 56, made of conductive material and in the form of a sheet, inserted in the transverse air gap 3 of the magnetic circuit 22 in the closed position of the contacts 48, 50, 52. With each pair of fixed and mobile contacts is associated a chamber 58, 60 arc extinction formed in a manner well known to specialists by stacking metal sheets of deionization.
  • the tongue 56 has a height greater than its thickness and occupies, when the circuit breaker is closed, an asymmetrical position in the air gap e3.
  • the operating mechanism 17 comprises a sliding support or cage 62 urged downward in FIG. 1 by a spring member (not shown).
  • the cage 62 carries a hook 42 pivotally mounted on an axis 66 and capable of being hooked to a stop 44 to retain the cage 62 in the raised position corresponding to the closing of the contacts 48, 50, 52.
  • the unlocking pusher 40 acts on the hook 42 to release the cage 62 during the attraction of the pallet 32.
  • the contact bridge 48 is positioned in elongated slots 64 formed in the wings of the cage 62.
  • a compression spring 68 interposed between the bottom of the cage 62 and the contact bridge 48, biases the latter up against the bottom of the lights 64.
  • the spring 68 ensures the contact pressure in the closed position of the circuit breaker and authorizes a downward movement in the open position of the contact bridge 48, the cage 62 being locked.
  • the magnetic circuit 22 constitutes both an electrodynamic propellant of the movable bridge 48 and an instantaneous electromagnetic trip device. It is clear from fig. 3 that the induction flow generated by the coil 30 breaks down into a flow 0 1 passing through the air gap e 3 for housing the contact bridge 48 and a flow O 2 passing through the air gaps e 1 and e 2 .
  • the two magnetic circuits or loops are in parallel and correspond respectively to functions 1 and 2, the two fluxes O 1 and 0 2 being generated by the same coil 30 of the trip device.
  • the thermal trip device comprises a bimetallic strip 18 connected on the one hand to a terminal 70 and on the other hand by a braid 72 to the coil 30.
  • the bimetallic strip 18 controls the unlocking of the hook42, when an overload current appears in a well-known manner.
  • the magnetic circuit 22 and its excitation coil 30 wound on the transverse core 28 form a fixed assembly disposed inside the cage 62 without hindering the sliding of the latter between the closed position (fig. 2) and opening (fig. 4).

Landscapes

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

Claims (4)

1. Strombegrenzender Niederspannungsselbstschalter mit per Pol einem festen Kontakt (50, 52), der in Schliessstellung mit einem beweglichen Kontakt (48) zusammenarbeitet, welcher an einen Hand- und/oder automatischen Steuermechanismus (17) zum Öffnen und Schliessen des Selbstschalters gekuppelt ist, und einem mit dem Mechanismus zusammenarbeitenden elektromagnetischen Auslöser (20) zum Auslösen des Selbstschalters und Öffnen der Kontakte (48, 50, 52), wenn der durch den elektromagnetischen Auslöser (20) gemessene Fehlerstrom eine erste Schwelle überschreitet, wobei der genannte Auslöser eine durch den Fehlerstrom durchflossene Erregerspule (30) mit einem axialen magnetischen Kern (28) und einem Magnetkreis (22) aufweist, der eine bewegliche Klappe (32) hat, die durch einen ersten Luftspalt (e1' e2) von zwei feststehenden wangenförmigen, parallelen Jochen (24, 26) getrennt ist, welche die mit dem Kern senkrecht zu den Wangen stehende Spule (30) umrahmen und mit der beweglichen Klappe (32) zum Verstellen dieser letzten in Auslösestellung beim Überschreiten der genannten ersten Schwelle zusammenarbeiten, wobei die genannten Wangen (24, 26) einen zweiten Luftspal (e3) bilden, in welchem ein Teil (56) des beweglichen Kontaktes (48) in Schliessstellung der Kontakte (48, 50, 52) liegt, dadurch gekennzeichnet, dass die Wangenenden (24, 26) senkrecht umgebogen sind, um so den zweiten Luftspalt (e3) von geringer Dicke zu bilden, in welchem in Schliessstellung der Kontakte (48, 50, 52) eine leitende Zunge (56) liegt, die zum Kontakt (48) gehört, der sich in einer zur Länge der Zunge (56) senkrechten und zu den Wangen (24, 26) parallelen Richtung bewegt, so dass der durch den die Spule (30) durchfliessenden Fehlerstrom gebildeten Magnetfluss in dem genannten Luftspalt (e3) einen elektrodynamischen schnellen Bewegungseffekt des beweglichen Kontaktes (48) in Öffnungsstellung bewirkt, wenn der Strom eine zweite höhere als die genannte erste Schwelle überschreitet.
2. Selbstschalter nach Anspruch 1, dadurch gekennzeichnet, dass der genannte bewegliche als Kontaktbrücke ausgebildete Kontakt (48) an der genannten in den zweiten Luftspalt (e3) in Schliessstellung der Kontakte (48, 50, 52) eingefügten Zunge (56) angeformt oder angeschlossen ist.
3. Selbstschalter nach Anspruch 2, dadurch gekennzeichnet, dass der bewegliche Kontakt (48) federnd in einem Schiebekäfig (62) angeordnet ist, der zum genannten Steuermechanismus (17) gehört und die feststehenden Spule (30) und Magnetkreis (22) umrahmt, und dass der genannte bewegliche Kontakt (48) durch eine Bewegung bezüglich zum genannten Käfig (62) unter dem genannten elektrodynamischen Effekt in Öffnungsstellung verstellbar ist.
4. Selbstschalter nach Anspruch 3, gekennzeichnet durch einen den Käfig (62) in Schliessstellung des Selbstschalters verriegelnden Riegel (42, 44) und ein durch die Klappe (32) gesteuertes Entriegelungsorgan (40) zur Entriegelung des Riegels (42, 44) und Verstellung des Käfigs (62) in Offnungsstellung mittels einer Feder.
EP19800400014 1979-01-11 1980-01-07 Strombegrenzender Selbstschalter für Niederspannung Expired EP0013642B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR790082 1979-01-11
FR7900827A FR2446538A1 (fr) 1979-01-11 1979-01-11 Disjoncteur limiteur basse tension a declencheur electromagnetique perfectionne

Publications (2)

Publication Number Publication Date
EP0013642A1 EP0013642A1 (de) 1980-07-23
EP0013642B1 true EP0013642B1 (de) 1982-10-13

Family

ID=9220718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800400014 Expired EP0013642B1 (de) 1979-01-11 1980-01-07 Strombegrenzender Selbstschalter für Niederspannung

Country Status (3)

Country Link
EP (1) EP0013642B1 (de)
DE (1) DE3060923D1 (de)
FR (1) FR2446538A1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA885255B (en) * 1987-04-21 1989-04-26 Circuit Breaker Ind An electric circuit breaker
EP0323404B1 (de) * 1987-12-25 1992-04-01 ABBPATENT GmbH Auslösesystem in einem Installationseinbauschalter
GB8917283D0 (en) * 1989-07-28 1989-09-13 Federal Pioneer Ltd Miniature circuit breakers
FR2687251B1 (fr) * 1992-02-11 1994-04-29 Telemecanique Structure de coupure pour disjoncteur.
EP2251887B1 (de) 2009-05-15 2016-03-16 Abb Ag Elektromagnetische Schnellauslösevorrichtung
FR2968829B1 (fr) * 2010-12-10 2012-12-21 Schneider Electric Ind Sas Disjonteur limiteur de courant
DE102011008832A1 (de) * 2011-01-19 2012-07-19 Abb Ag Installationsschaltgerät
DE102011008833B4 (de) * 2011-01-19 2013-03-07 Abb Ag Überstromauslöser und Installationsschaltgerät mit Überstromauslöser
DE102011008829B4 (de) * 2011-01-19 2012-08-09 Abb Ag Installationsschaltgerät
DE102011008831A1 (de) * 2011-01-19 2012-07-19 Abb Ag Istallationsschaltgerät
DE102011008834A1 (de) * 2011-01-19 2012-07-19 Abb Ag Installationsschaltgerät
CN108389763B (zh) * 2018-05-09 2023-10-31 佳一电气有限公司 N极断路器单元

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR596483A (fr) * 1925-04-08 1925-10-24 Disjoncteur ultra-rapide
GB369740A (en) * 1931-03-17 1932-03-31 John Westmoreland Record Improvements in or relating to electric circuit breakers or like circuit rupturing apparatus
US3317866A (en) * 1963-02-07 1967-05-02 Terasaki Denki Sangyo Kk Automatic circuit interrupter having magnetic blowoff means
FR2185853B1 (de) * 1972-05-26 1977-12-30 Merlin Gerin

Also Published As

Publication number Publication date
DE3060923D1 (en) 1982-11-18
EP0013642A1 (de) 1980-07-23
FR2446538B1 (de) 1983-02-18
FR2446538A1 (fr) 1980-08-08

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