EP0223272A2 - Disjoncteur électrique limiteur de courant avec ouverture des contacts par répulsion électrodynamique - Google Patents

Disjoncteur électrique limiteur de courant avec ouverture des contacts par répulsion électrodynamique Download PDF

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Publication number
EP0223272A2
EP0223272A2 EP86201744A EP86201744A EP0223272A2 EP 0223272 A2 EP0223272 A2 EP 0223272A2 EP 86201744 A EP86201744 A EP 86201744A EP 86201744 A EP86201744 A EP 86201744A EP 0223272 A2 EP0223272 A2 EP 0223272A2
Authority
EP
European Patent Office
Prior art keywords
contact
circuit breaker
control mechanism
holder arms
electrical circuit
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
EP86201744A
Other languages
German (de)
English (en)
Other versions
EP0223272A3 (en
EP0223272B1 (fr
Inventor
Angelo Mostosi
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.)
ABB SACE SpA
Original Assignee
ABB SACE SpA
SACE SpA
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 ABB SACE SpA, SACE SpA filed Critical ABB SACE SpA
Publication of EP0223272A2 publication Critical patent/EP0223272A2/fr
Publication of EP0223272A3 publication Critical patent/EP0223272A3/en
Application granted granted Critical
Publication of EP0223272B1 publication Critical patent/EP0223272B1/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
    • H01H77/102—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
    • H01H77/104—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 with a stable blow-off position
    • 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
    • H01H2071/2427—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism with blow-off movement tripping mechanism, e.g. electrodynamic effect on contacts trips the traditional trip device before it can unlatch the spring mechanism by itself
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/0253—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch two co-operating contacts actuated independently
    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/522—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
    • H01H71/525—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism comprising a toggle between cradle and contact arm and mechanism spring acting between handle and toggle knee

Definitions

  • the object of the present invention is a current-­limiter electrical circuit breaker with contact opening by electrodynamic repulsion.
  • circuit breakers of such a kind are known.
  • a control mechanism can act to the purpose of displacing the related contact, either by manual or by remote control, from a contacts open position to a contacts closed position, and vice-versa.
  • suitable devices are moreover inserted in series, which are sensible to low- and medium-intensity currents, said devices being generally of thermal and/or of magnetic type, suitable to act, in case of abnormal current overloads, on a release device to cause the control mechanism to be disengaged, to the purpose of automatically moving the contact-holder arm connected to it to a position of final opening.
  • This automatic release of the control mechanism results however less rapid than the contacts opening caused by the repulsive electro­dynamic forces.
  • Electrical circuit breakers of this kind are known, in which the contact - belonging to the couple of coupled contacts - which can be forced to move to the opening direction by the repulsive electrodynamic forces against the action of a spring, is the contact on which the control mechanism does not act.
  • this spring can be so positioned as to cause it to cross, during the opening movement of the related contact caused by the electrodynamic repulsion, a dead point, so that, at the end of said movement, it keeps the related contact in its open position.
  • the other contact viz., the one on which the control mechanism is active, results still locked, and hence it cannot move.
  • one contact belonging to the couple of coupled contacts is stationary, and the other one is movable and is linked to the control mechanism provided with a blocking device which keeps locked the two contacts in their closed position, the release of this control mechanism locking device being possible by means of thermomagnetic release devices sensible to currents of low or medium intensity.
  • This other contact can be moved against elastic means, in the direction of opening of the coupled contacts, also by the repulsive electrodynamic forces, in case of heavy overloads due to short circuit.
  • An electrical circuit breaker of this type is known, for example, from German Patent 24 43 771 and from the publ. German Pat. Appln. 33 36 207.
  • Purpose of the present invention is hence to provide a current-limiter electrical circuit breaker with contact opening by electrodynamic repulsion which allows, in case of very high current overloads due to short circuit, a greater and still quicker opening of the two coupled contacts, and hence a more efficacious and quick extinc­tion of the arc occurring between the two contacts at the opening time, to be obtained.
  • a current-limiter electric­al circuit breaker with contact opening by electrodynamic repulsion comprising at least a couple of contacts in­serted between a power supply terminal and a load termi­nal, the contact-holder arms of which form two branches substantially parallel and closely approached to each other, through which currents of opposite sign flow, a control mechanism kinematically linked to one of the two contact-holder arms through a compound toggle lever form­ed by two sectors and a spring suitable to pass from one side to the other side, and vice-versa, of a dead-point position, a blocking device for the locking of the con­trol mechanism in its active position, and thermomagnetic devices suitable to act on a release device for the disengaging of said blocking device, characterized in that the hinge connecting the two sectors of the compound toggle lever to each other is constituted by a limitedly sliding slot-pin coupling, and that the second one of the two contact-holder arms is linked to said release device through a
  • the second contact-holder arm on which the control mechanism does not act can istanta­neously move towards the opening direction in order to cause, after a certain opening stroke, the disengaging of the blocking device of the control mechanism of the other contact-holding arm, also this latter is allowed to move into opening direction under the action of high repulsive electrodynamic forces, even if the control mechanism is still blocked, and hence before the intervention of the other release device, and this thanks to the fact that the two sectors of the compound toggle lever are not hinged to each other in a fixed way, but through a slid­ing coupling constituted by a pin with possible roller solid with a sector and slidingly inserted in a slot provided in the second sector.
  • the circuit breaker pole shown comprises a couple of contacts 10, 11, respectively hold by contact-holder arms 12, 13.
  • the contact-holder arm 12 is rotatable around a pin 14, whilst the contact-holder 13 is fastened onto a rotary shaft 15.
  • the contact-holder arm 12 is connected through a flexible conductor 16 to a first terminal 18 and the contact-holder arm 13 is connected through a flexible conductor 17 to a terminal 19 with known thermomagnetic release devices, schematically indicated in 20, 21, being interposed.
  • the current path comprises two branches parallel and near to each other, constituted by the contact-holder arms 12 and 13, through which branches currents of opposite sign flow, and inside said current path the thermomagnetic release devices 20 and 21 are furthermore inserted in series.
  • the contacts 10,11 are inserted, in a known way, in an arc-quenching system, indicated in a schematic way only.
  • the contact on which the control mechanism for the controlled opening and closing of the circuit breaker acts is contact 11, held by arm 13.
  • the shaft 15, with which the contact-holder arm 13 is solid bears also a sector 23 which constitutes one of the two sectors of a compound toggle lever.
  • the other sector is constituted by an element 24 hinged in 25 to a lever 26 mounted in a rotary way around a stationary pin 27.
  • the sector 24 has a suitable profile and rests with an edge surface thereof 24a on pin 27.
  • the sector 24 is provided at a free end thereof with a pin 28 with roller 29, which roller is slidingly guided inside a slot 30 provided in sector 23.
  • the coupling between slot 30 and pin 28 with roller 29 forms a sliding hinge for mutual connection of sectors 23 and 24.
  • a control lever 31 is rotatably mounted around a stationary fulcrum 32 and, between a pin 33 solid with the lever 31 and the pin 28 solid with the sector 24, a spring 34 is active.
  • the lever 26 is kept in the position as illustrated in Fig. 2 by a blocking device constituted by a two-armed lever 35 rotatably mounted around a pin 36 and bearing at the end of one of its arms a hook 37 suitable to engage a slot 38 provided in lever 26.
  • a blocking device constituted by a two-armed lever 35 rotatably mounted around a pin 36 and bearing at the end of one of its arms a hook 37 suitable to engage a slot 38 provided in lever 26.
  • the thermomagnetic release devices 20, 21 can act through interposed mechanical means, of which a rod 39 is schematically shown.
  • a small lever 40 On the same other arm of lever 35 also a small lever 40, rotary around a pin 41, can act.
  • the small lever 40 is a part of a kinematic chain consti­tuted by a lever 42 solid with a shaft 43, which lever 42 bears an adjustment grub-screw 44 suitable to act on small lever 40.
  • the shaft 43 holds, solid with itself, also a
  • the disengaging of locking hook 37 from the slot 38 of lever 26 can be caused not only by the thermo­magnetic release devices 20, 21 through rod 39, but also directly by the contact-holder arm 12 when the same moves away from its position of contacts closed, under the action exerted by the electrodynamic repulsion forces.
  • circuit breaker closed is that shown in Figs. 1 and 2.
  • a short cir­cuit occurs with a current overload of, e.g., about 30 times the rated current value of the circuit breaker
  • the repulsive electrodynamic forces which are generated in the two parallel branches closely approached to each other, cause a movement in the opening direction of the contact-holder arm 12 around pin 14 and against a thrust spring 22, as illustrated in Fig. 3, and through the kinematic chain formed by elements 45, 43, 42, 44, 40 the lever 35 is rotated in the direction which causes hook 37 to get disengaged from slot 38 of lever 26.
  • the opening movement of the contact-holder arm 13 is made possible, notwithstanding the fact that the control mechanism is initially still locked, by the fact that the hinge of the compound toggle lever is not fixed, but sliding, the two sectors 23 and 24 of this compound lever being linked to each other through the sliding coupling of roller 29 - hold by the sector 24 - in the slot 30 provided in sector 23.
  • the sector 23 of the compound toggle lever solid with the contact-holder arm 13 can rotate around the axis of shaft 15, causing also the sector 24 to rotate around pin 25, thanks to the sliding of roller 29 inside slot 30.
  • both the contact-holder arms 12, 13 are directly caused to rotate by the repulsive electrodynamic forces, with a consequent istantaneous and greater open­ing or mutual spacing apart of contacts 10, 11, and thus with a more effective extinction of the arc generated between the two contacts.
  • arrows shown in Figs. from 3 to 6 indicate the directions of movement of the related elements during their respective displacements.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
EP19860201744 1985-10-18 1986-10-08 Disjoncteur électrique limiteur de courant avec ouverture des contacts par répulsion électrodynamique Expired EP0223272B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2345885U IT206253Z2 (it) 1985-10-18 1985-10-18 Interruttore elettrico limitatore di corrente ad apertura dei contatti per repulsione elettrodinamica.
IT2345885U 1985-10-18

Publications (3)

Publication Number Publication Date
EP0223272A2 true EP0223272A2 (fr) 1987-05-27
EP0223272A3 EP0223272A3 (en) 1989-07-26
EP0223272B1 EP0223272B1 (fr) 1991-06-12

Family

ID=11207280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860201744 Expired EP0223272B1 (fr) 1985-10-18 1986-10-08 Disjoncteur électrique limiteur de courant avec ouverture des contacts par répulsion électrodynamique

Country Status (3)

Country Link
EP (1) EP0223272B1 (fr)
DE (1) DE3679782D1 (fr)
IT (1) IT206253Z2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ300885B6 (cs) * 2002-01-22 2009-09-02 Oez S.R.O. Záves tažné pružiny, zejména pro silové pružiny u spínacích prístroju
CZ300886B6 (cs) * 2002-03-25 2009-09-02 Oez S.R.O. Vybavovací ústrojí, zejména spínacích mechanismu jisticu a odpínacu
EP3151262A4 (fr) * 2014-05-27 2018-01-17 Technology Power International Ltd. Disjoncteur avec réponse et séparation rapides, et procédé de réponse et de séparation rapides pour disjoncteur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1232636A (fr) * 1958-07-30 1960-10-11 Licentia Gmbh Interrupteur approprié de préférence à de grandes intensités de courant, par exemple disjoncteur commandé électromagnétiquement par un déclencheur instantané ou un élément analogue
FR1551832A (fr) * 1967-01-27 1968-12-27
US3469216A (en) * 1966-07-12 1969-09-23 Nikko Electric Mfg Co Ltd High speed current limiting circuit breaker utilizing electromagnetic repulsion
EP0072972A2 (fr) * 1981-08-22 1983-03-02 Licentia Patent-Verwaltungs-GmbH Disjoncteur automatique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1232636A (fr) * 1958-07-30 1960-10-11 Licentia Gmbh Interrupteur approprié de préférence à de grandes intensités de courant, par exemple disjoncteur commandé électromagnétiquement par un déclencheur instantané ou un élément analogue
US3469216A (en) * 1966-07-12 1969-09-23 Nikko Electric Mfg Co Ltd High speed current limiting circuit breaker utilizing electromagnetic repulsion
FR1551832A (fr) * 1967-01-27 1968-12-27
EP0072972A2 (fr) * 1981-08-22 1983-03-02 Licentia Patent-Verwaltungs-GmbH Disjoncteur automatique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ300885B6 (cs) * 2002-01-22 2009-09-02 Oez S.R.O. Záves tažné pružiny, zejména pro silové pružiny u spínacích prístroju
CZ300886B6 (cs) * 2002-03-25 2009-09-02 Oez S.R.O. Vybavovací ústrojí, zejména spínacích mechanismu jisticu a odpínacu
EP3151262A4 (fr) * 2014-05-27 2018-01-17 Technology Power International Ltd. Disjoncteur avec réponse et séparation rapides, et procédé de réponse et de séparation rapides pour disjoncteur

Also Published As

Publication number Publication date
EP0223272A3 (en) 1989-07-26
EP0223272B1 (fr) 1991-06-12
DE3679782D1 (de) 1991-07-18
IT8523458V0 (it) 1985-10-18
IT206253Z2 (it) 1987-07-13

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