EP0013642A1 - Strombegrenzender Selbstschalter für Niederspannung - Google Patents

Strombegrenzender Selbstschalter für Niederspannung Download PDF

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Publication number
EP0013642A1
EP0013642A1 EP19800400014 EP80400014A EP0013642A1 EP 0013642 A1 EP0013642 A1 EP 0013642A1 EP 19800400014 EP19800400014 EP 19800400014 EP 80400014 A EP80400014 A EP 80400014A EP 0013642 A1 EP0013642 A1 EP 0013642A1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
cheeks
threshold
coil
contact
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.)
Granted
Application number
EP19800400014
Other languages
English (en)
French (fr)
Other versions
EP0013642B1 (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 multi-pole low-voltage limiting circuit breaker with molded housing comprising, by pole, a fixed contact cooperating in the closed 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 an electromagnetic trip 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 traversed by said fault current and a magnetic circuit having a movable pallet and two fixed yokes in the form of cheeks framing the spool with an axis perpendicular to the cheeks and cooperating with the movable pallet to move the latter in the release position when said first threshold is exceeded.
  • the yokes of the magnetic circuit of the electromagnetic trip device constitute the blown cheeks of the arc.
  • 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 cheeks extend parallel to the side walls of the housing and define between them a first thin air gap through which extends in the closed position of the contacts a conductive tab belonging to the contact movable, 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 an electrodynamic effect of rapid displacement of the movable contact in the open position.
  • the small air gap provides sufficient magnetic flux to move the movable contact to the open position before the mechanism is unlocked, 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 beating.
  • a second air gap is formed between the pallet and the cheeks of the magnetic circuit and, according to an important characteristic of the invention, these air gaps are arranged in two different branches or loops and in parallel with the magnetic circuit.
  • the excitation coil is advantageously wound on a transverse core interposed between the cheeks to generate a flow which is divided in the loops in parallel into two partial flows, one of which crosses the first air gap and causes by interaction with the current in the tab the ultra-fast movement of the movable contact to the open position, and the other of which crosses the second air gap and attracts the pallet.
  • the movable contact is resiliently mounted on a support and urged in the closed position by a contact pressure spring.
  • a return spring of different force acts on the pallet so that the attraction of the pallet occurs after exceeding a first current threshold, called the triggering threshold, lower than a second threshold, called the repulsion threshold, which causes l '' electrodynamic drive of the movable contact to the open position.
  • the unlocking of the support by the release prevents any closing of the electrodynamically pulsed moving contact.
  • a low voltage circuit breaker with high breaking capacity comprises a molded housing 10 formed of 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 the yokes 24, 26 by any suitable fixing method, in particular by riveting or crimping.
  • Two air gaps e 1 and e2 are arranged between the upper ends of the cylinder heads 24, 26 and a movable release pallet 32 disposed above the coil 30 opposite the cut-off device 16.
  • the pallet 32 is constituted by a stirrup 33 U-shaped ferromagnetic, pivotally mounted on an axis 34, and biased by a return spring 36 towards a spaced-apart reset 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 combined 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.
  • Each pair of fixed and movable contacts is associated with a arc extinguishing chamber 58, 60 formed in a manner well known to specialists by a stack of 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 3 .
  • 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 provides 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 ⁇ 1 passing through the air gap e 3 for housing the contact bridge 48 and a flow ⁇ 2 passing through the air gaps e 1 and e 2 .
  • the two circuits or magnetic loops are in parallel and correspond respectively to functions 1 and 2, the two fluxes ⁇ 1 and 0 2 being generated by the same coil 30 of the trigger.
  • 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 hook 42, when a current of overload 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).
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
FR7900827A FR2446538A1 (fr) 1979-01-11 1979-01-11 Disjoncteur limiteur basse tension a declencheur electromagnetique perfectionne
FR790082 1979-01-11

Publications (2)

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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU607791B2 (en) * 1987-04-21 1991-03-14 Circuit Breaker Industries Limited An electric circuit breaker
EP2479770A1 (de) * 2011-01-19 2012-07-25 Abb Ag Installationsschaltgerät
EP2479771A1 (de) * 2011-01-19 2012-07-25 Abb Ag Installationsschaltgerät
EP2479772A1 (de) * 2011-01-19 2012-07-25 Abb Ag Installationsschaltgerät
CN108389763A (zh) * 2018-05-09 2018-08-10 佳电气有限公司 N极断路器单元

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE102011008834A1 (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

Citations (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
GB1056132A (en) * 1963-02-07 1967-01-25 Terasaki Denki Sangyo Kk Electrical circuit interrupter
FR2185853A1 (de) * 1972-05-26 1974-01-04 Merlin Gerin

Patent Citations (6)

* 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
GB1056132A (en) * 1963-02-07 1967-01-25 Terasaki Denki Sangyo Kk Electrical circuit interrupter
FR2185853A1 (de) * 1972-05-26 1974-01-04 Merlin Gerin
FR2237302A2 (de) * 1972-05-26 1975-02-07 Merlin Gerin
FR2278146A2 (fr) * 1972-05-26 1976-02-06 Merlin Gerin Dispositif de deplacement rapide d'un contact electrique

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU607791B2 (en) * 1987-04-21 1991-03-14 Circuit Breaker Industries Limited An electric circuit breaker
EP2479770A1 (de) * 2011-01-19 2012-07-25 Abb Ag Installationsschaltgerät
EP2479771A1 (de) * 2011-01-19 2012-07-25 Abb Ag Installationsschaltgerät
EP2479772A1 (de) * 2011-01-19 2012-07-25 Abb Ag Installationsschaltgerät
CN108389763A (zh) * 2018-05-09 2018-08-10 佳电气有限公司 N极断路器单元
CN108389763B (zh) * 2018-05-09 2023-10-31 佳一电气有限公司 N极断路器单元

Also Published As

Publication number Publication date
FR2446538A1 (fr) 1980-08-08
FR2446538B1 (de) 1983-02-18
DE3060923D1 (en) 1982-11-18
EP0013642B1 (de) 1982-10-13

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