EP0619593B1 - Mehrpoliger Strombegrenzungsschalter mit elektrodynamischer Abstossung - Google Patents

Mehrpoliger Strombegrenzungsschalter mit elektrodynamischer Abstossung Download PDF

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Publication number
EP0619593B1
EP0619593B1 EP94420094A EP94420094A EP0619593B1 EP 0619593 B1 EP0619593 B1 EP 0619593B1 EP 94420094 A EP94420094 A EP 94420094A EP 94420094 A EP94420094 A EP 94420094A EP 0619593 B1 EP0619593 B1 EP 0619593B1
Authority
EP
European Patent Office
Prior art keywords
contact
bar
movable contact
circuit breaker
spring
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
EP94420094A
Other languages
English (en)
French (fr)
Other versions
EP0619593A1 (de
Inventor
Jean-Luc Payet-Burin
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 SE
Original Assignee
Schneider Electric SE
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 SE filed Critical Schneider Electric SE
Publication of EP0619593A1 publication Critical patent/EP0619593A1/de
Application granted granted Critical
Publication of EP0619593B1 publication Critical patent/EP0619593B1/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
    • 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
    • H01H77/102—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 special mounting of contact arm, allowing blow-off movement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2066—Fork-shaped bridge; Two transversally connected contact arms bridging two fixed contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/225—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member the supporting member being pivotable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H2001/223—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member using a torsion spring

Definitions

  • the movable contact is subjected to a variation of the return torque of the contact pressure spring, said torque being increasing to an intermediate position of the opening stroke, then decreasing until 'in the open position.
  • Document FR-A 2553 930 of the applicant belongs to a second type of limiting circuit breaker having a reversible mechanism, in which the axis of rotation of the bar coincides with the point of articulation of each contact arm.
  • the tension spring is anchored between the movable contact and the bar.
  • each pole cooperates with the toggle device to rotate the switching rod in the opening direction after the actuation of the electrodynamic repulsion means of the faulty pole so as to allow contact separation of all the poles before the release of the release lever by the latch.
  • the reversibility of the mechanism by rotation of the bar during the first phase of electrodynamic opening accelerates the tripping time to confirm the definitive opening of the circuit breaker.
  • the rotation of the bar before the intervention of the trigger is made possible thanks to the deformation of the toggle joint whose angle of offset of the rods is comprised in the closed position between 10 and 20 degrees.
  • the invention relates to the first type of limiting circuit breaker, and aims to improve the anti-fallout system of the movable contact at the end of the repulsion stroke.
  • the circuit breaker according to the invention is characterized in that: the movable contact is shaped like a fork having a common core for supporting two contact arms, and a retaining tail articulated on the axis and that the spiral spring is mounted floating in the recess of the bar and comprises a cooperating feeler member with two balancing slots on the support surface integral with the core to distribute the contact pressure on the two contact arms.
  • the spiral spring comprises two helical windings of metal wire, arranged coaxially in the recess by being interconnected in the central zone by a projecting elastic connection constituting said feeler, and comprising two strands of ends bearing against a wall of the bar.
  • the distribution of the contact pressure with the spiral spring is effected by means of two balancing slots provided on the bearing surface of the core of the movable fork contact. Each slot has hooking surfaces to temporarily block the movable contact in the second active position.
  • a multipolar circuit breaker 10 with molded insulating casing 12 comprises a breaking module 14 per pole, formed by a one-piece bulb 16 made of molded plastic, and having the shape of a rectangular parallelepiped.
  • the bulb 16 comprises a front face 18 having an orifice 20 for passage of the movable contact 22, and the breaking module 14 comprises a device for electrodynamic repulsion of the contacts.
  • the tripping device 42 comprises a magnetothermal trip device 44 equipped opposite the pad 40, with a fourth contact pad 46 forming part of the other terminal 48 for connecting the pole.
  • the trip device 44 is electrically inserted in series in the pole with the contacts 22, 24, 26 of the breaking module 14.
  • the triggering device 42 further comprises a trigger bar 50 mounted with limited rotation between an armed position and a triggered position as a function of the position of the actuating member of the trigger 44, for example the bimetallic strip 52 or the pallet 54
  • the rotary bar 50 is moved to the triggered position as soon as the current flowing in the pole exceeds a predetermined threshold.
  • the trigger bar 50 also cooperates with a latch 56 for hooking a mechanism 58 for controlling the toggle joint 60 and the lever 62.
  • the mechanism 58 is common to all of the poles, and is housed inside the housing 12, only the handle 62 being accessible from the outside by passing through a lumen 64 formed in the front face of the housing 12, for controlling manual circuit breaker 10.
  • the lower link 66 of the toggle joint 60 is coupled to a protuberance 68 of a switching bar 70 serving to support the movable contacts 22 of all the poles.
  • the switching bar 70 is made of insulating material and extends parallel to the trigger bar 50 in the transverse direction of the poles.
  • the lock 56 unlocking order can come from the thermomagnetic trip device 44, or from an auxiliary trip device, in particular with MN voltage shortage, with MX current emission, differential, etc.
  • Each cut-off module 14 contains two arc extinguishing chambers, of which only one 74 is shown in FIG. 1, each chamber being in communication with an opening or channel 76 for exhaust of the cutting gases to the outside of the bulb 16.
  • Each arc extinguishing chamber 74 is formed by a stack of deionization sheets with V-notches oriented towards the movable contact 22.
  • the switching bar 70 of a three-pole circuit breaker is equipped with three identical movable contacts 22, distributed at regular intervals along the transverse direction of the bar 70.
  • Each movable contact 22 has the form of a fork two contact arms 22a, 22b, parallel, cooperating in the closed position with the two fixed contacts 24, 26.
  • each cut-off module 14 The interior of the bulb 16 of each cut-off module 14 is subdivided by an intermediate insulating wall into two adjacent compartments, into which the two arms 22a, 22b of the movable contact 22 in forks penetrate through the orifice 2o, the contact mobile 22 being positioned astride the wall during its pivoting between the closed and open positions.
  • the bar 70 is guided in rotation by bearings (not shown) provided in the bulb 16 of the different cut-off modules 14.
  • each movable contact 22 in a fork has a common base 80 for supporting the two vertical contact arms 22a, 22b, so as to form an inverted U.
  • the rectilinear base 80 extends in the transverse direction of the bar 70, and is equipped in the central area with a retaining tail 82 whose free end is articulated on a horizontal axis 84 integral with the bar 70.
  • the tail 82 is located in the median plane of symmetry with an opposite orientation relative to the two elementary contact arms 22a, 22b.
  • each movable contact 22 is housed with play in two aligned bearings 86, 88 formed on the upper face of the bar 70.
  • the contact axis 84 is parallel, and eccentric with respect to the axis of rotation of the bar 70.
  • Each movable contact 22 cooperates with a spiral spring 90 located in a recess 92 delimited by a rectangular frame 93 of the bar 70 to ensure the contact pressure in the closed position.
  • the spring 90 comprises two helical windings 90a, 90b coaxial made of metal wire and interconnected by an intermediate elastic connection 94, which is crossed by the tail 82 while bearing on the base 80 of the movable contact 22.
  • the elastic connection 94 of the spring 90 comprises two strands of wire, shaped according to a half-turn playing the role of feeler, and having a projecting portion 94a curved upwards.
  • the probe of the elastic connection 94 is positioned in two slots 96, 98 in V provided on the bearing surface 80a of the base 80 to ensure the balancing of the contact pressure in the closed position of the contacts 22, 24, 26
  • the two slots 96, 98 are symmetrical with respect to the median plane passing through the tail 82, and the two end strands 100, 102 of the two windings 90a, 90b are permanently pressed against the internal upper face of the frame 93.
  • the spring 90 is mounted floating in the recess 92 relative to the axis of the rotary bar 70.
  • the cooperation of the spring 90 with the core 80 of the movable contact 22 in the fork constitutes a device for temporarily maintaining the contact at the end of the electrodynamic repulsion stroke.
  • FIG. 4 shows the pressure force P which is exerted on the movable contact 22 when the latter is in a first rest position.
  • the line of action of the force P is substantially perpendicular to the electrical connection 94 of the spring 90, and urges the movable contact 22 in an anti-clockwise direction to exert the contact pressure.
  • the handle 62 of the mechanism 58 is in the closed position, in abutment against the left end of the slot 64.
  • the mechanism 58 with spring 72 is armed, and the trigger 44 is inactive.
  • the point of application 103 of the force P is located on the edge of the core 80.
  • the appearance of a short-circuit current in the pole causes an effect of electrodynamic repulsion of the contacts, with a rapid displacement of the movable contact 22, which pivots around its axis 84, in the direction of the needles of a watch.
  • the electrodynamic repulsion ensures an abrupt opening of the contacts of the faulty pole, before the mechanical intervention of the control mechanism 58.
  • the spring 72 and the toggle joint 60 remain stationary, as does the switching bar 70, the position of which corresponds to that of FIG. 1.
  • the arc remains anchored between the movable contact 22 and the fixed arcing horn 104, and is propelled towards the deionization plates of the extinguishing chamber 74.
  • the movable contact 22 is open to the maximum, and is in abutment against the wall of the bulb 16.
  • the arc is cooled by the sheets of the chamber 74, and the trigger 44 begins to control the trigger phase of the mechanism 58 (see arrows).
  • the latch 56 releases the toggle joint 60 causing the spring 72 to relax, and the bar 70 to rotate clockwise, so as to confirm the opening of the moving contact 22.
  • the slots 96, 98 advantageously have hooking surfaces shaped to temporarily block the movable contact 22 in the maximum repulsion position.
  • FIG. 9 shows a phase of manual opening of the circuit breaker 10 by actuation of the handle 62 in the direction of the arrow.
  • the mechanism 58 remains armed, and the rotation of the bar 70 causes the movable contact 22 to move towards the open position as soon as the lever 62 has passed the intermediate position of the opening dead center.

Landscapes

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

Claims (5)

  1. Strombegrenzender Mehrpol-Leistungsschalter mit Isolierstoffgehäuse (12), das
    - eine Stromunterbrechungsvorrichtung, die pro Pol mit elektrodynamischer Rückstoßung arbeitende, trennbare Kontaktelemente (22), (24), (26) und mindestens eine Lichtbogenlöschkammer (74) umfaßt,
    - einen einer Gestängefeder (72) sowie einer Auslösevorrichtung (42) zugeordneten Schaltmechanismus (58) mit Kniehebelgelenk (60),
    - eine als Trägerelement für die beweglichen Kontakte (22) sämtlicher Pole dienende Isolierstoff-Schaltwelle (70), wobei die genannte Schaltwelle mechanisch an das Kniehebelgelenk (60) angekoppelt ist, um durch den Mechanismus (58) zwischen der Einschaltstellung und der Ausschaltstellung der Kontakte verschwenkt zu werden,
    - einen, durch eine an der Vorderseite des Gehäuses (12) ausgebildete Öffnung (64) geführten und an den Mechanismus (58) angekoppelten Kipphebel (62), wobei
    - der bewegliche Kontakt (22) jedes Pols als Kontaktarm ausgebildet ist, der an einer fest mit der Schaltwelle (70) verbundenen Achse (84) angelenkt ist, der genannte bewegliche Kontakt (22) durch elektrodynamische Rückstoßung aus einer ersten Ruhestellung in eine zweite, aktive Stellung verschoben werden kann und die Achse (84) des beweglichen Kontakts (22) exzentrisch zur Drehachse der Schaltwelle (70) angeordnet ist,
    - sowie elastische Mittel enthält, die eine, in einer Aussparung (92) der Schaltwelle (70) gelagerte Feder (90) zur Gewährleistung des Kontaktdrucks sowie zur Verzögerung des Rückfalls des beweglichen Kontakts (22) in die erste Ruhestellung umfassen, wobei die Feder (90) gleitend mit einer Auflagefläche (80a) des beweglichen Kontakts (22) zusammenwirkt, um den Angriffspunkt (103a) der Druckkraft P im Verlauf des Ausschalthubs zu verschieben,
    dadurch gekennzeichnet, daß
    der bewegliche Kontakt (22) in Form eines Bügels mit einem gemeinsamem Mittelschenkel (80) ausgebildet ist, an dem zwei Kontaktarme (22a, 22b) sowie eine an der Achse (84) angelenkte Haltezunge (82) befestigt sind, und daß die Spiralfeder (90) frei beweglich in die Aussparung (92) der Schaltwelle (70) eingesetzt ist und ein Andrückelement (94) umfaßt, das mit zwei, in die am Mittelschenkel (80a) ausgebildete Auflagefläche (80a) eingearbeiteten Ausgleichskerben (96, 98) zusammenwirkt, um den Kontaktdruck auf die beiden Kontaktarme (22a, 22b) zu verteilen.
  2. Leistungsschalter nach Anspruch 1, dadurch gekennzeichnet, daß die Spiralfeder (90) zwei Draht-Spiralkörper (90a), (90b) umfaßt, die koaxial in die Aussparung (92) eingesetzt und im Mittelbereich über eine, das genannte Andrückelement (94) bildende, hervorstehende elastische Verbindung miteinander verbunden sind sowie zwei Endabschnitte (100), (102) aufweisen, die sich an einer Wand der Schaltwelle (70) abstützen.
  3. Leistungsschalter nach Anspruch 2, dadurch gekennzeichnet, daß die elastische Verbindung des Andrückelements (94) eine Drahthalbwindung umfaßt, die einen nach oben gebogenen, hervorstehenden Teil (94a) aufweist.
  4. Leistungsschalter nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die beiden Spiralkörper (90a), (90b) der Feder (90) sowie die beiden Kontaktarme (22a), (22b) des bügelförmigen Kontakts (22) in jedem Pol symmetrisch zu der durch die Haltezunge (82) verlaufenden Mittelebene angeordnet sind.
  5. Leistungsschalter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß in jeder Kerbe (96), (98) Rastflächen ausgebildet sind, um den beweglichen Kontakt (22) vorübergehend in der zweiten, aktiven Stellung zu blockieren.
EP94420094A 1993-04-07 1994-03-22 Mehrpoliger Strombegrenzungsschalter mit elektrodynamischer Abstossung Expired - Lifetime EP0619593B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9304298 1993-04-07
FR9304298A FR2703824B1 (fr) 1993-04-07 1993-04-07 Disjoncteur limiteur multipolaire à répulsion électrodynamique.

Publications (2)

Publication Number Publication Date
EP0619593A1 EP0619593A1 (de) 1994-10-12
EP0619593B1 true EP0619593B1 (de) 1997-04-16

Family

ID=9445985

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94420094A Expired - Lifetime EP0619593B1 (de) 1993-04-07 1994-03-22 Mehrpoliger Strombegrenzungsschalter mit elektrodynamischer Abstossung

Country Status (6)

Country Link
US (1) US5469121A (de)
EP (1) EP0619593B1 (de)
JP (1) JP3509923B2 (de)
DE (1) DE69402597T2 (de)
ES (1) ES2102171T3 (de)
FR (1) FR2703824B1 (de)

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DE69402597D1 (de) 1997-05-22
ES2102171T3 (es) 1997-07-16
FR2703824B1 (fr) 1995-05-12
JPH06325678A (ja) 1994-11-25
FR2703824A1 (fr) 1994-10-14
DE69402597T2 (de) 1997-10-02
US5469121A (en) 1995-11-21
EP0619593A1 (de) 1994-10-12
JP3509923B2 (ja) 2004-03-22

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