EP0059118B1 - Mehrpoliger elektrischer Schalter mit Strombegrenzungsvorrichtung - Google Patents

Mehrpoliger elektrischer Schalter mit Strombegrenzungsvorrichtung Download PDF

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Publication number
EP0059118B1
EP0059118B1 EP82400132A EP82400132A EP0059118B1 EP 0059118 B1 EP0059118 B1 EP 0059118B1 EP 82400132 A EP82400132 A EP 82400132A EP 82400132 A EP82400132 A EP 82400132A EP 0059118 B1 EP0059118 B1 EP 0059118B1
Authority
EP
European Patent Office
Prior art keywords
contact
arm
contact arm
opening
stop
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
EP82400132A
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English (en)
French (fr)
Other versions
EP0059118A1 (de
Inventor
Jean Bancalari
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 EP0059118A1 publication Critical patent/EP0059118A1/de
Application granted granted Critical
Publication of EP0059118B1 publication Critical patent/EP0059118B1/de
Expired 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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/504—Manual reset mechanisms which may be also used for manual release provided with anti-rebound means
    • 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

Definitions

  • each pole comprises a specific counterweight of predetermined mass, mechanically connected to the movable contact by a dead-stroke mechanical connection, and capable of '' make a limited movement in relation to the latter.
  • a first bias spring is associated with the mechanical connection, and a second contact pressure spring biases the movable contact in the closed position.
  • the rapid displacement towards the open position of the movable contact is effected by means of an auxiliary magnetic circuit with a thin air gap surrounding at least one conductor traversed by the current.
  • Document US-A-3 614 687 describes a molded case circuit breaker, consisting of two coupled blocks, a circuit breaker block and a limiter block.
  • the circuit breaker block is equipped with a manual joystick control and an automatic opening control on fault or overload.
  • the limiter block comprises, by pole, three pairs of contacts, the movable contacts of which are carried by three arms pivotally mounted on the same axis. In the closed position of the limiter block contacts, the contact arms extend parallel and at a short distance from a fixed conductor, traversed by a current of opposite direction to generate an electrodynamic force of repulsion of the contact arms. Each arm is biased in the closed position by a spring.
  • An asymmetry of the contacts, in particular of the force of the closing spring, of the distribution of the currents or of the arrangement of the contacts ensures a delayed opening of one of the contacts which acts as an arcing contact. Locking by a dead travel link between the contact arms requires the opening of the main contacts before that of the arcing contact. At the end of the opening stroke, the three arms strike against a stop and close. This closing may occur before opening the circuit breaker block, preventing the power failure.
  • the object of the invention is to produce a large-caliber limiting circuit breaker equipped with a simple and reliable inertia retarder member.
  • the retarder member comprises the counterweight formed by a first contact arm, associated by a dead-link mechanical connection with a second juxtaposed contact arm cooperating in the open position with a stopper arranged as a shock absorber to limit the travel of the second contact arm beyond the open position and to allow continued movement of the first juxtaposed arm until the dead travel of the mechanical link is caught up, the inertia of the first contact arm then compensating for the shock due to the coming into engagement of the second arm and the stop, so as to prevent the immediate closing of the contact arms before the intervention of the trip unit.
  • the inertia of at least one movable contact arm is advantageously used to form the counterweight of the retarder member.
  • said mechanical connection comprises a drive member integral with the second contact arm associated with the stop, and cooperating with play with the first juxtaposed counterweight arm capable of performing a limited movement during said dead travel.
  • the drive member of the mechanical connection comprises a stop pin fixed to the second contact arm and extending in a transverse direction through an opening formed in the first contact arm juxtaposed, the diameter of the opening being greater than that of the axis to determine said dead travel.
  • the stop pin is fixed perpendicular to the second intermediate contact arm, in tercalé between the first and a third contact arm of identical structures.
  • a low-voltage multipolar limiter circuit breaker for high ratings for example of the order of 1000 amperes, is composed of a standard circuit breaker block 10 with molded insulating housing 11, superimposed on a lower limiter block 12 with molded insulating housing 13 with the same basic dimensions.
  • the open intermediate bottom 14 constitutes a partition wall between the two housings 11, 13 and has orifices 15 for the passage of connection conductors.
  • the circuit breaker block 10 comprises by pole fixed contacts 16 arranged in the vicinity of the bottom 14 and cooperating in the closed position with corresponding movable contacts 18 carried by a plurality of pivoting fingers 20 housed in a cage 21
  • a breaking chamber 19 is provided in each pole and comprises a stack of metal separators for extinguishing the arc drawn between the contacts 16, 18 during their separation.
  • An operating mechanism 22 with toggle switch 24 and spring 23 energy accumulator is arranged in the central zone of the housing 11 and controls the closing and opening of the contact fingers 20, either by manual actuation of a lever 26 external, or by the interaction of a trip unit 28 causing the automatic release of the trip hook 29 associated with the mechanism 22 and causing the opening of the circuit breaker in the event of a fault.
  • the trip unit 28 with adjustable trip threshold of the magnetothermic or electronic type is sensitive to overload or short-circuit currents and is arranged longitudinally opposite the breaking chamber 19 relative to the mechanism 22.
  • a switching bar 30 common to all the poles extends in the transverse direction of the housing 11 and cooperates with the operating mechanism 22 for the simultaneous actuation of the different cages 21 juxtaposed during manual or automatic control.
  • a connecting braid 32 electrically connects the rear part of each contact finger 20 to a conductive pad 34 passing through the trip unit 28. It is unnecessary to describe in detail the structure and operation of such a circuit breaker unit 10 well known to specialists. .
  • the limiter block 12 attached to the intermediate bottom 14 comprises three contact arms 36a, 36b, 36c juxtaposed by pole, each arm 36 having an elongated shape extending in the longitudinal direction of the housing 13 and parallel to the contact fingers 20 of the circuit breaker block 10 superior.
  • One end of each arm 36a, 36b, 36c carries a movable contact 37 cooperating in the closed position with a fixed contact 38 arranged on a fixed conductor 40 pressed against the bottom 41 of the housing 13.
  • the opposite end of the arm 36a , 36b, 36c is articulated on a pivot axis 42 oriented in the transverse direction of the bar 30, and housed in the housing 13 between the conductor 40 and the lower part of the trigger block 28.
  • each contact arm 36a, 36b, 36c extends parallel to and short distance from conductor 40 to form a large current loop subjected to electrodynamic repulsion forces when a short-circuit current appears.
  • a compression spring 58 disposed opposite the chamber 44 biases each arm 36a, 36b, 36c in the closed position of the contacts 37, 38.
  • the line of action of the spring 58 is substantially perpendicular to the transverse direction of the pivot axis 42, and the return force of the spring 58 is exerted on the end of the arm 36 opposite the movable contact 37.
  • a connecting braid 52 electrically connects each contact arm 36a, 36b, 36c movable to a first connection pad 50 by means of a perpendicular conductor 54, which passes through a light formed in the bottom 41.
  • the conductor 54 is traversed longitudinally by the lower conductor 40.
  • the second connection pad 48 is integral with a conductor 51 of C-shaped connection passing behind the deionization plates 46 of the arc extinguishing chamber 44 to cause the attraction of the arc drawn between the contacts 37, 38.
  • the connecting conductor 51 crosses an opening 15 in the intermediate bottom 14 and is connected to the fixed contact 16 of the corresponding pole of the circuit breaker block 10.
  • the two connection pads 48, 50 of each pole of the limiting circuit breaker are arranged under the base 41 of the limiter block base 12, so as to avoid current feeds through the lateral faces of the boxes 11.
  • Each pole of the limiter block 12 is equipped with an inertia retarder device which becomes active at the end of the opening stroke of the contact arms 36a, 36b, 36c to slow their fall back to the closed position by hindering the reclosing of the contacts 37, 38 before tripping of the circuit breaker block 10.
  • the central contact arm 36b is provided for this purpose with a stop pin 60 held in a circular hole 61 by two retaining washers 62, 64 on the opposite faces of said arm 36b.
  • the stop axis 60 extends parallel to the pivot axis 42 in the transverse direction of the housing 13, and engages by its opposite ends in two circular openings 66, 68 formed respectively in the two other lateral arms 36a , 36c juxtaposed disposed on either side of the central contact arm 36b.
  • Each opening 66, 68 has a diameter greater than that of the stop axis 60.
  • the length of the latter is also less than the width of a pole.
  • a protrusion 70 projecting from the intermediate bottom 14 serves as a shock absorber for the central contact arm 36b when it comes at the end of the opening course.
  • the limiter block 12 does not intervene and the contacts 37, 38 remain closed thanks to the predominant action of the contact pressure springs 58 vis-à-vis the weak electrodynamic repulsion forces exerted between the contact arms 36 and the conductor 40.
  • the fault is detected by the trigger block 28 which controls the unlocking of the trigger hook 29 of the mechanism 22, followed by the opening of the contacts 16, 18 of the circuit breaker block 10, the arc extinguishing taking place in the breaking chamber 19.
  • the stopped pivoting of the central arm 36b at the end of the first opening phase does not, however, hinder the continued movement of the lateral arms 36a, 36c during a dead travel da broken up during the second opening phase.
  • the take-up of the dead travel d takes place by the engagement of the openings 66, 68 of the lateral fingers 36a, 36c (in broken lines, FIG. 1) and of the stop axis 60 of the central arm 36b.
  • the abutment of the central arm 36b against the protrusion 70 generates a shock tending to return said central arm 36b to the closed position.
  • the invention is not limited to the embodiment described, but it extends to any variant remaining within the framework of electrotechnical equivalences, in particular that in which a different number of contact arms 36a, 36b, 36c ... would be used in the limiter block 12, and that in which the mechanical connection to play of the inertia retarder device would be arranged differently.
  • the latter has been described with reference to a modular limiter block 12 associated with an independent circuit breaker block 10 with automatic trip 28, but it is understood that the retarder device according to the invention also applies to any other limiter circuit breaker whose functions of limitation and disjunction are combined in the same device.

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

Claims (5)

1. Mehrpoliger Niederspannungsstrombegrenzungsschalter mit einem Kniehebelsteuermechanismus (22, 24), der mit einem Handsteuerknebel (26) und mit einem automatischen Auslöseblock (28) mit einstellbarer Auslöseschwelle zusammenwirkt, wobei jeder Pol besteht aus:
- einer Löschkammer (19, 44) des zwischen den sich trennenden festen (16, 38) und beweglichen (18, 37) Kontakten gezogenen Lichtbogens,
- Stromzuführungsfahnen (48, 50) zu den genannten Kontakten,
- mehreren beweglichen Kontaktarmen (36a, 36b, 36c), die sich quer in parallelen Flächen erstrecken, wobei jeder Arm bei einem plötzlichen Stromanstieg durch elektrodynamisches Zurückstoßen schnell öffnet und diese Schnellöffnung vor der endgültigen mechanischen Öffnung des Poles, zufolge der durch den automatischen Auslöser (28) gesteuerten Entriegelung des Mechanismus (22), eintritt,
- die Arme (36a, 36b, 36c) in Schließstellung drückenden elastischen Mitteln (58) zur Bildung einer Kontaktkraft bis zu einer vorbestimmten Schwelle,
- und einem Hemmungsorgan mit einem Gewicht, das am Ende der Öffnungsbewegung mit den genannten Kontaktarmen (36a, 36b, 36c) zusammenwirkt, zum Versichern einer längeren Zurückstoßöffnungsdauer als die Ansprechdauer des Auslöseblocks (28),

dadurch gekennzeichnet, daß das Hemmungsorgan eine durch den ersten Kontaktarm (36a, 36c) gebildete Masse aufweist, die durch eine mechanische Verbindung (60, 66, 68) mit einem toten Schlag an einem zweiten anliegenden Kontaktarm (36b) verbunden ist, welcher in Öffnungsstellung mit einem als Stoßdämpfer zur Begrenzung der Bewegung des Kontaktarmes (36b) über die Öffnungsstellung hin und zur Weiterbewegung des ersten anliegenden Armes (36a, 36c) bis zum Einholen des toten Schlages der mechanischen Verbindung wirkenden Anschlag (70) zusammenwirkt, wobei die Trägheit des ersten Kontaktarmes (36a, 36c) danach den Stoß des zweiten Armes (36b) auf dem Anschlag (70) auffängt, um ein direktes Wiederschließen der Kontaktarme vor dem Einsetzen des Auslöseblocks zu verhindern.
2. Mehrpoliger Strombegrenzungsschalter nach Anspruch 1, dadurch gekennzeichnet, daß die genannte mechanische Verbindung ein an dem zweiten mit dem Anschlag (70) arbeitenden Kontaktarm (36b) verbundenen Antriebsorgan (60) aufweist, das mit Spiel mit dem ersten anliegenden Massekontakt (36a, 36c) für eine beschränkte Bewegung während des genannten toten Schlages zusammenwirkt.
3. Mehrpoliger Strombegrenzungsschalter nach Anspruch 2, dadurch gekennzeichnet, daß das Antriebsorgan der mechanischen Verbindung eine an dem zweiten Kontaktarm (36b) befestigte Anhaltswelle (60) hat, die sich quer durch eine in dem ersten anliegenden Kontaktarm (36a, 36c) vorgesehene Öffnung (66, 68) erstreckt, wobei der Querschnitt der Öffnung (66, 68) größer ist als der der Welle (60), um den genannten toten Schlag zu bilden.
4. Mehrpoliger Strombegrenzungsschalter nach Anspruch 3, dessen bewegliche Kontaktarmanzahl größer ist als zwei, dadurch gekennzeichnet, daß die Anhaltswelle (60) senkrecht an dem zweiten zwischen dem ersten (36a) und einem dritten (36c) Kontaktarm mit Öffnungen (66, 68) liegenden Kontaktarm (36b) befestigt ist.
5. Mehrpoliger Strombegrenzungsschalter nach einem der vorigen Ansprüche 1 bis 4, da- - durch gekennzeichnet, daß der die Bewegung des zweitem Kontaktarmes (36b) begrenzende Anschlag (70) durch einen Vorsprung des Schaltergehäuses gebildet wird.
EP82400132A 1981-02-11 1982-01-25 Mehrpoliger elektrischer Schalter mit Strombegrenzungsvorrichtung Expired EP0059118B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8102800A FR2499762A1 (fr) 1981-02-11 1981-02-11 Disjoncteur electrique multipolaire a dispositif de limitation de courant perfectionne
FR8102800 1981-02-11

Publications (2)

Publication Number Publication Date
EP0059118A1 EP0059118A1 (de) 1982-09-01
EP0059118B1 true EP0059118B1 (de) 1985-11-13

Family

ID=9255142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400132A Expired EP0059118B1 (de) 1981-02-11 1982-01-25 Mehrpoliger elektrischer Schalter mit Strombegrenzungsvorrichtung

Country Status (6)

Country Link
US (1) US4417223A (de)
EP (1) EP0059118B1 (de)
JP (1) JPS57151132A (de)
CA (1) CA1167495A (de)
DE (1) DE3267339D1 (de)
FR (1) FR2499762A1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626811A (en) * 1985-10-15 1986-12-02 Westinghouse Electric Corp. Circuit interrupter with integral resilient stop means for contact arm
JPH01265423A (ja) * 1988-04-18 1989-10-23 Fuji Electric Co Ltd 回路遮断器
FR2633464B1 (fr) * 1988-06-28 1995-03-31 Merlin Gerin Dispositif de protection contre des effets des impulsions electromagnetiques nucleaires
KR930010967B1 (ko) * 1989-09-18 1993-11-18 미쯔비시 덴끼 가부시기가이샤 한류형 회로차단기
JP2894052B2 (ja) * 1990-12-11 1999-05-24 株式会社日立製作所 回路遮断器
US5504292A (en) * 1994-01-13 1996-04-02 Square D Company Arc stack for a circuit breaker
US5680081A (en) * 1994-01-13 1997-10-21 Square D Company Circuit breaker having double break mechanism
US5424699A (en) * 1994-02-14 1995-06-13 Square D Company Blow-off terminal for a circuit breaker
US5500496A (en) * 1994-02-14 1996-03-19 Square D Company Handle assembly for a circuit breaker
US5504291A (en) * 1994-02-14 1996-04-02 Square D Company Contact blade assembly for a circuit breaker
US5444423A (en) * 1994-02-14 1995-08-22 Square D Latch mechanism for a circuit breaker
US5539167A (en) * 1994-02-14 1996-07-23 Square D. Company Blade suspension assemlby for a circuit breaker
US5581063A (en) * 1995-06-26 1996-12-03 Square D Company Arc-resistant shield for protecting a movable contact carrier of a circuit breaker
US5608198A (en) * 1995-06-26 1997-03-04 Square D Company Circuit breaker arrangement for protection against electrical arcs
JP4321296B2 (ja) * 2004-02-19 2009-08-26 富士電機機器制御株式会社 反発形回路遮断器の接触子装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT177827B (de) * 1953-02-02 1954-03-10 Elin Ag Elek Ind Wien Prellarme Kontaktanordnung
DE1665817C3 (de) * 1966-11-29 1974-08-08 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektrischer Schalter, insbesondere Schnellschalter
US3614687A (en) * 1968-08-28 1971-10-19 Tokyo Shibaura Electric Co Circuit interrupting apparatus
FR2351483A1 (fr) * 1976-05-12 1977-12-09 Merlin Gerin Disjoncteur rapide limitateur
JPS57115737A (en) * 1981-01-12 1982-07-19 Hitachi Ltd Current limiting breaker

Also Published As

Publication number Publication date
US4417223A (en) 1983-11-22
EP0059118A1 (de) 1982-09-01
DE3267339D1 (en) 1985-12-19
FR2499762A1 (fr) 1982-08-13
CA1167495A (en) 1984-05-15
JPH026181B2 (de) 1990-02-07
FR2499762B1 (de) 1984-04-06
JPS57151132A (en) 1982-09-18

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