EP0223272B1 - Strombegrenzender elektrischer Schalter mit Kontaktöffnung durch elektrodynamische Abstossung - Google Patents

Strombegrenzender elektrischer Schalter mit Kontaktöffnung durch elektrodynamische Abstossung Download PDF

Info

Publication number
EP0223272B1
EP0223272B1 EP19860201744 EP86201744A EP0223272B1 EP 0223272 B1 EP0223272 B1 EP 0223272B1 EP 19860201744 EP19860201744 EP 19860201744 EP 86201744 A EP86201744 A EP 86201744A EP 0223272 B1 EP0223272 B1 EP 0223272B1
Authority
EP
European Patent Office
Prior art keywords
contact
circuit breaker
contacts
control mechanism
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.)
Expired
Application number
EP19860201744
Other languages
English (en)
French (fr)
Other versions
EP0223272A3 (en
EP0223272A2 (de
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
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 filed Critical ABB SACE SpA
Publication of EP0223272A2 publication Critical patent/EP0223272A2/de
Publication of EP0223272A3 publication Critical patent/EP0223272A3/en
Application granted granted Critical
Publication of EP0223272B1 publication Critical patent/EP0223272B1/de
Expired legal-status Critical Current

Links

Images

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 couple of contacts are always provided, inserted between the power supply terminal and the load terminal, said contacts being held by related support arms which form branches substantially parallel and suitably closely approached to each other, through which currents of opposite sign flow, so that - in case of strong current overloads due to short circuit - repulsive electrodynamic forces are generated, which tend to istantaneously open the contacts.
  • 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 is, 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, is 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 DE-A- 24 43 771 and from the document DE-A- 33 36 207.
  • the 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 kinematic chain.
  • 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, the latter is also 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 into a slot provided in the second sector.
  • Fig. 1 shows a schematic side view of a pole of a circuit breaker according to the invention, with the contacts being closed
  • Fig. 2 shows a schematic side view from the control side, always in position of circuit breaker closed
  • Figs. 3-4, 5-6 show views respectively analogous to those of Figs. 1 and 2, in various sequential steps of contacts opening by elctrodynamic repulsion
  • Figs. 7-8 show views analogous to those of Figs. 1 and 2 in position of open circuit breaker.
  • the circuit breaker pole shown comprises a couple of contacts 10, 11, respectively held 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 which 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 second lever 45 which
  • 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 - held 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)

Claims (2)

  1. Strombegrenzender elektrischer Stromkreisunterbrecher mit Kontaktöffnung durch elektrodynamische Abstoßung, mit zumindest einem Kontaktpaar (10,11), welches zwischen eine Leistungszufuhrklemme und eine Lastklemme eingeschaltet ist und dessen Kontaktträgerarme (12,13) zwei im wesentlichen parallel und einander eng benachbart verlaufende Arme bilden, durch welche Ströme einander entgegengesetzten Vorzeichens fließen, mit einem Steuermechanismus, welcher mit einem (13) der beiden Kontaktträgerarme (12,13) kinematisch über eine Kniehebelverbindung verbunden ist, die zwei Abschnitte (23,24) und eine Feder (34) aufweist, zum Übergang von einer Seite einer Totpunktlage auf die andere, bzw. umgekehrt, mit einer Blockiereinrichtung zur Verriegelung des Steuermechanismus in seiner wirksamen Lage, und mit thermomagnetischen Einrichtungen (20,21), welche auf eine Freigabeeinrichtung zur Entkupplung von der Blockiereinrichtung einwirken können, dadurch gekennzeichnet, daß die Gelenkverbindung der beiden Sektoren (23,24) der Kniehebelverbindung miteinander von einer begrenzt gleitbaren Schlitz-Zapfen-Kupplung (30,28) gebildet ist, und daß der zweite (12) der beiden Kontaktträgerarme (12,13) mit der Freigabeeinrichtung über eine kinematische Kette verbunden ist.
  2. Elektrischer Stromkreisunterbrecher nach Anspruch 1, wobei der erwähnte Zapfen (28) eine Rolle (29) trägt, welche innen im Schlitz (30) in gleitender Anlage steht.
EP19860201744 1985-10-18 1986-10-08 Strombegrenzender elektrischer Schalter mit Kontaktöffnung durch elektrodynamische Abstossung Expired EP0223272B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=11207280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860201744 Expired EP0223272B1 (de) 1985-10-18 1986-10-08 Strombegrenzender elektrischer Schalter mit Kontaktöffnung durch elektrodynamische Abstossung

Country Status (3)

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

Families Citing this family (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
CN104022000B (zh) * 2014-05-27 2017-04-05 通能顺达科技国际有限公司 一种快速反应脱离断路器和断路器的快速反应脱离方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL112822C (de) * 1958-07-30
US3469216A (en) * 1966-07-12 1969-09-23 Nikko Electric Mfg Co Ltd High speed current limiting circuit breaker utilizing electromagnetic repulsion
NL142271B (nl) * 1967-01-27 1974-05-15 Terasaki Denki Sangyo Kk Automatische schakelinrichting met beweegbare contactstangen openend onder invloed van elektrodynamische krachten.
DE3133285C2 (de) * 1981-08-22 1984-05-30 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Selbstschalter

Also Published As

Publication number Publication date
DE3679782D1 (de) 1991-07-18
EP0223272A3 (en) 1989-07-26
IT206253Z2 (it) 1987-07-13
EP0223272A2 (de) 1987-05-27
IT8523458V0 (it) 1985-10-18

Similar Documents

Publication Publication Date Title
US5731560A (en) Operating mechanism of a circuit breaker with a locking system disengageable on a short circuit
US6018284A (en) Circuit breaker with high electrodynamic strength and breaking capacity
CA1217804A (en) Remote controlled circuit breaker
US3824359A (en) Vacuum loadbreak switch
US4278958A (en) Electromagnetically operated multi-pole circuit breaker
US4791250A (en) Trip-free, three-link switch assembly
GB1583716A (en) Circuit breaker
US4821008A (en) Latching operating mechanism of a three-position circuit breaker
US5140117A (en) Two-link, trip-free mechanism for use in a switch assembly
US5713459A (en) Roller latching and release mechanism for electrical switching apparatus
US4574170A (en) Multi-polar circuit breaker
EP0223272B1 (de) Strombegrenzender elektrischer Schalter mit Kontaktöffnung durch elektrodynamische Abstossung
GB1222456A (en) A current-limiting circuit breaker
US3786382A (en) Compact circuit breaker
JPH0119313Y2 (de)
US3940723A (en) Instantaneously tripping device for circuit interrupter
US3684848A (en) Circuit interrupter spring charging means with toggle type latch
US5828277A (en) Contactor/circuit-breaker type switch device
US3475711A (en) Electric circuit breaker operating mechanism and assembly thereof
JPH04351824A (ja) 遮断器
US5931289A (en) Circuit breaker with quick closing mechanism
US3505621A (en) Coupling for two-pole circuit breaker
US6819205B2 (en) Current limiting low-voltage power circuit breaker
US3315189A (en) Circuit breaker assembly
EP0168888A2 (de) Strombegrenzender Schutzschalter mit ultraschneller Auslösung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): BE CH DE FR GB LI NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): BE CH DE FR GB LI NL SE

17P Request for examination filed

Effective date: 19891130

17Q First examination report despatched

Effective date: 19901126

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ABB SACE S.P.A.

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE FR GB LI NL SE

REF Corresponds to:

Ref document number: 3679782

Country of ref document: DE

Date of ref document: 19910718

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19910913

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19910927

Year of fee payment: 6

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19911022

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19911031

Year of fee payment: 6

Ref country code: NL

Payment date: 19911031

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19911101

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19911230

Year of fee payment: 6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19921008

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19921009

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19921031

Ref country code: CH

Effective date: 19921031

Ref country code: BE

Effective date: 19921031

BERE Be: lapsed

Owner name: ABB SACE S.P.A.

Effective date: 19921031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19930501

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19921008

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930630

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 86201744.9

Effective date: 19930510