EP0003447B1 - Dispositif de limitation et de coupure de courant - Google Patents

Dispositif de limitation et de coupure de courant Download PDF

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Publication number
EP0003447B1
EP0003447B1 EP19790400014 EP79400014A EP0003447B1 EP 0003447 B1 EP0003447 B1 EP 0003447B1 EP 19790400014 EP19790400014 EP 19790400014 EP 79400014 A EP79400014 A EP 79400014A EP 0003447 B1 EP0003447 B1 EP 0003447B1
Authority
EP
European Patent Office
Prior art keywords
conductor
contacts
circuit breaker
movable
conductors
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
EP19790400014
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0003447A1 (fr
Inventor
Robert Morel
Pierre Schueller
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9204106&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0003447(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0003447A1 publication Critical patent/EP0003447A1/fr
Application granted granted Critical
Publication of EP0003447B1 publication Critical patent/EP0003447B1/fr
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
    • H01H77/107—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
    • 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

Definitions

  • the performance of a conventional circuit breaker can be increased by connecting a limiter block in series, intended to limit the peak value of a short circuit current and to relieve the action of the conventional circuit breaker.
  • These limiting circuit breaker assemblies can replace special circuit breakers with high breaking capacity and allow the marketing of a range of devices based on a standard device.
  • circuit breaker and limiter blocks of the type corresponding to the preamble of claim 1 (publication FR-A-2,272,479).
  • the circuit breaker and limiter blocks are simply juxtaposed and no interaction by electromagnetic or electrodynamic effect between the blocks is exploited.
  • Certain copper elements and circuits. implemented in this known device are duplicated and the advantage of the circuit breaker block limiter assembly compared to a circuit breaker with high breaking capacity is reduced by a higher manufacturing cost.
  • the object of the invention is to remedy this drawback and to achieve interaction between the circuit breaker and limiter blocks, more particularly between the circuits of these blocks to generate rapid opening of the contacts of the limiter and / or of the circuit breaker.
  • the present invention is based on the observation that the limitation of the current results from a rapid opening of the contacts by electrodynamic effect, due to a repulsion or attraction between conductors traversed by short-circuit currents, this effect being sensitive on conductors separated by a wall of insulating material and which can be reinforced by magnetic yokes for concentration of the flux. Electrodynamic blowing of the drawn arcs increases the desired limiting effect.
  • the limiting device is characterized in that said third conductor extends in the closed position of the contacts of the circuit breaker near said wall parallel to said first and second conductors of the limiter block and in that said first and third conductors are electrically connected in series to be traversed by currents generating an additional electrodynamic force of displacement of the first movable conductor in the open position of said fast opening contacts.
  • This device requires additional moving parts and a mechanical transmission of movements which is difficult to achieve between a circuit breaker block and a removable limiter block according to the invention.
  • the advantages obtained by the favorable arrangement of the circuits according to the invention consist, on the one hand, in the use of the circuit breaker circuit to increase the electrodynamic force of opening of the contacts of the limiter and on the other hand in an increased blowing of the 'bow drawn.
  • an action of the circuit of the limiter block on the moving contact of the circuit breaker is provided to accelerate its opening and generate an additional limitation of the current.
  • the blocks being joined back to back, the conductors are separated by the bottom of the molded case of the circuit breaker, and possibly the bottom of the limiter block, if this bottom exists, but in large-caliber devices interactions remain sufficient.
  • the presence of magnetic yokes in the limiter block and / or the circuit breaker block allows a channeling of the magnetic flux and compensation of the spacing between the conductors, due to the presence of the bottom of the box.
  • the circuit breaker is preferably without cylinder heads to keep a standard device.
  • the electrical circuit in the limiter and circuit breaker blocks is advantageously in the form of a PCB, the central fixed conductor being surrounded by the movable conductors of the circuit breaker and of the limiter.
  • the limiter block and the circuit breaker block may each comprise a pair of independent contacts and the associated interrupting chambers are advantageously opposite.
  • the tenth contact of the circuit breaker can be replaced by a movable contact carried by an appendage of the movable conductor of the limiter block; which crosses the bottom of the housing and cooperates with the movable contact of the circuit breaker.
  • This arrangement has the advantage of rapid separation of the two movable contacts of the circuit breaker and the elimination of the flexible connection between the limiter block and the circuit breaker block.
  • the limiter-circuit breaker assembly comprises a single pair of contacts, one of which belongs to the circuit breaker block and the other of which is carried by an appendage of the movable conductor of the limiter block.
  • the conductors and in particular the current supply (s) are arranged to exert on the arc a blowing effect, favoring the elongation and the entry of the arc into the breaking chamber.
  • the association of the circuit breaker and limiter block is particularly simple and does not require any significant modification of the standard circuit breaker. This is limited to replacing the conductor of the fixed contact of the circuit breaker with a connection piece or in some cases by removing this fixed contact.
  • the O-shaped structure of the electrical circuit retains the classic arrangement on the opposite sides of the input and output terminals, which facilitates connections and mounting in standard boxes and panels.
  • a circuit breaker block 10 with molded case 12 is joined by its bottom 14 to a limiter block 16 with molded case 18 with the same basic dimensions, but with an open bottom.
  • the bottom 14 constitutes a partition wall between the two blocks 10, 16 having an orifice 20 for passage of a flexible connection in the form of a braid 22 .
  • the circuit breaker 10 of a well-known type, comprises in its part close to the bottom 14, a fixed contact 24 which cooperates with a movable contact 26, carried by an elongated arm 28, mounted for rotation on a pivot 30 adjacent to the contact 26
  • a control mechanism 32 diagrammatically represented by a block, controls the opening and closing of the movable contact 26 by moving, for example, the pivot 30, the interaction between the mechanism 32 and the movable contact 26 being shown diagrammatically in the figures by a double arrow.
  • a trip unit 34 controls the control mechanism 32 to trip the circuit breaker in the event of a fault, and a handle (not shown), allows manual control.
  • a pair of contacts 24, 26 is associated with a breaking chamber 36 advantageously comprising deionization sheets (not shown).
  • the rear part of the contact arm 28, opposite the movable contact 26 relative to the pivot 30, is framed by two magnetic yokes 36, 36 ', attached to the side walls and to the bottom 14 of the housing 12.
  • a braid 38 connects this rear part from the arm 28 to an output pad 40 and a spring (not shown) biases the movable contact 26 in the closed position.
  • the circuit breaker 10 When the circuit breaker 10 is used, only the fixed contact 24 is connected or ends with a contact pad 42, shown in broken lines. In combination with the limiter block 16, the area 42 is eliminated or, more precisely, the contact assembly 24, area 42 is replaced by a contact 24 allowing the connection of the braid 22. It is unnecessary to describe in detail the structure and operation of the circuit breaker 10 which are well known to specialists.
  • the limiter block 16 comprises a fixed conductor 44, which carries at one of its ends, opposite the output range 40 of the circuit breaker 10, an input range 46 and at the other end a fixed contact 48.
  • the fixed conductor 44 In position assembly of the boxes 12, 18 the fixed conductor 44 is pressed against the bottom 14 and extends parallel to the contact 24 and to the contact arm 28 of the circuit breaker 10.
  • the fixed contact 48 cooperates with a movable contact 50, carried by an contact 52, the latter being articulated on an axis 54 disposed on the side of the input pad 46. In the closed position the arm 52 extends parallel and at a short distance from the fixed conductor 44.
  • the contact arms 28, 52 are struggling in the same plane perpendicular to the bottom 14 and containing the fixed conductor 44.
  • a spring 56 biases the arm 52 in the closed position of the contacts 48, 50 and the end of the arm 52, opposite the contact 50, is connected to the braid 22 Contacts 48, 50 cooperate with an interrupting chamber 58 arranged opposite of chamber 36.
  • the arm 52 is framed by magnetic yokes 60, 60 'attached to the side walls of the housing 18 and to the bottom 14, these yokes being arranged as an extension of the yokes 36, 36' of the circuit breaker block 10 and having an air gap in which the arm 52 is inserted in the closed position of the contacts 48.50.
  • the current limiting device operates as follows: In the closed position of the device, shown in FIGS. 1 and 2, the current enters through the range 46, travels through the fixed conductor 44, in the direction indicated by the arrow, the closed contacts 48, 50, the contact arm 52, the braid 22, the contacts 24, 26, the arm 28, the braid 38 and the output pad 40 following an o-shaped trajectory, the central branch of which is constituted by the fixed conductor 44 and the lateral branches respectively by the contact arm 52 and the arm 28. It is easy to see that the direction of current flow in the contact arm 52 is opposite to that in the fixed conductor 44, generating an electrodynamic repulsive force which tends to rotate the contact arm 52 in the clockwise direction of opening of the contacts 48; 50 against the spring 56.
  • the direction of current flow in the fixed conductor 44 and the arm 28 is however the same and an electrodynamic force of attraction is exerted between these conductors 44, 28.
  • the rear part of the arm 28 is longer than the front part which carries the contact 26 and is arranged on the opposite side of the pivot 30 so that the result of the electrodynamic forces tends to rotate the arm 28 clockwise corresponding to the opening of the contacts 24 , 26.
  • the contacts 48, 50 and 24, 26 are kept closed by the contact pressure springs whose action is predominant.
  • the magnetic circuit constituted by the yokes 36, 36 'extended by the yokes 60, 60' picks up and concentrates the magnetic flux to increase the action of the electrodynamic forces exerted on the contact arm 52. It should be noted that the presence of all or some of these yokes 36, 36 ', 60, 60' is not essential in large gauge devices where the electrodynamic forces generated are strong enough to quickly move the contacts.
  • the combination according to the invention, of the limiting block 16 and of the standard circuit breaker block 10 allows interaction of the conductors arranged in these blocks which promotes the effect of limiting the current and the blowing of the arcs.
  • the transformation of the standard circuit breaker is limited to the replacement or adaptation of the fixed contact 24 and the fixing of the braid 22. In the majority of cases the cylinder heads 36, 36 'are superfluous.
  • FIG. 3 illustrates one of them, which has the advantage of eliminating the braid 22 and of opening the contacts of the circuit breaker as fast as that of the contacts of the limiter.
  • the same reference numbers designate parts similar or identical to those identified by these numbers in FIGS. 1 and 2.
  • the fixed contact 24 of the circuit breaker 10 is eliminated and replaced by a movable contact 62 carried by a appendix 64 of the contact arm 52, which passes through the orifice 20 formed in the bottom 14.
  • the operation of the device naturally remains the same, but the speed of opening of the contacts 62, 26 of the circuit breaker block 10 is increased. From the start of the movement of the contact arm 52 carrying the appendage 64, the contacts 62, 26 separate at an increased speed by the almost simultaneous movement of the two contacts 62, 26 in the opposite direction.
  • Appendix 64 facilitates the assembly of blocks 10, 16 and avoids any additional electrical connection.
  • Figure 3 only the cylinder heads 60, 60 'of the limiter block have been retained.
  • FIG. 4 illustrates an alternative embodiment derived from that of FIG. 3 and making use of a single pair of contacts 62, 26.
  • the support appendage 64 of the contact 62 which cooperates with the movable contact 26 of the circuit breaker 10, belongs to a contact arm 52 ', which extends parallel to the fixed conductor 44 in the limiter block 16 and whose opposite end is rotatably mounted on a axis 54 'and is connected by a braid 66 to the end of the fixed conductor 44.
  • a stop 68 limits the travel of the arm 52' in the closing direction of the contacts 62, 26 to allow a normal opening or tripping of the circuit breaker 10. In the event of a short circuit, the contacts 62, 26 quickly separate as described above.
  • the structure of the limiter block 16 is notably simplified by the absence of the contacts and of the associated breaking chamber.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP19790400014 1978-01-31 1979-01-08 Dispositif de limitation et de coupure de courant Expired EP0003447B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7802844 1978-01-31
FR7802844A FR2416541A1 (fr) 1978-01-31 1978-01-31 Dispositif de limitation et de coupure de courant

Publications (2)

Publication Number Publication Date
EP0003447A1 EP0003447A1 (fr) 1979-08-08
EP0003447B1 true EP0003447B1 (fr) 1982-05-26

Family

ID=9204106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790400014 Expired EP0003447B1 (fr) 1978-01-31 1979-01-08 Dispositif de limitation et de coupure de courant

Country Status (3)

Country Link
EP (1) EP0003447B1 (enrdf_load_stackoverflow)
DE (1) DE2962934D1 (enrdf_load_stackoverflow)
FR (1) FR2416541A1 (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514194A1 (fr) * 1981-10-05 1983-04-08 Merlin Gerin Disjoncteur limiteur basse tension
DE3206445A1 (de) * 1982-02-23 1983-09-01 Siemens AG, 1000 Berlin und 8000 München Leitungsschutzschalteranordnung, geeignet als vorautomat
IT1151197B (it) * 1982-05-21 1986-12-17 Cge Comp Gen Elettromecc Interruttore a limitazione di corrente avente un perfezionato sistema di contatti
DE69030666T2 (de) * 1989-06-30 1997-10-16 Hitachi Ltd Ausschalter
JP2894052B2 (ja) * 1990-12-11 1999-05-24 株式会社日立製作所 回路遮断器
US5583328A (en) * 1992-07-02 1996-12-10 Mitsubishi Denki Kabushiki Kaisha High voltage switch including U-shaped, slitted stationary contact assembly with arc extinguishing/magnetic blowout features
DE112007003283T5 (de) * 2007-01-24 2010-02-04 Siemens Aktiengesellschaft Doppelunterbrechungskontaktsystem für einen Niederspannungsleistungsschalter und das Doppelunterbrechungskontaktsystem umfassender Kompaktleistungsschalter
CN102360975B (zh) * 2011-10-11 2012-12-26 天津市津荣天宇精密机械有限公司 灭弧室自动装配机
CN106807843A (zh) * 2017-02-21 2017-06-09 安徽汇精模具研发科技有限公司 低压电器灭弧室冲压、快速组装一体化模具系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593227A (en) * 1968-02-28 1971-07-13 Gennady Fedosievich Mitskevich Automatic electrodynamic blowoff breaker with stationary contact form of two series wound u-shaped members
NL158644B (nl) * 1969-03-25 1978-11-15 Hazemeijer Bv Elektrische schakelaar met elektrodynamische vergroting van de contactdruk en van de uitschakelsnelheid.
US3663903A (en) * 1971-05-20 1972-05-16 Ite Imperial Corp Tripping system for circuit breaker
US4042895A (en) * 1975-09-16 1977-08-16 Westinghouse Electric Corporation Combination motor-starter and circuit breaker

Also Published As

Publication number Publication date
EP0003447A1 (fr) 1979-08-08
DE2962934D1 (en) 1982-07-15
FR2416541A1 (fr) 1979-08-31
FR2416541B1 (enrdf_load_stackoverflow) 1980-08-22

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