EP0168888A2 - Strombegrenzender Schutzschalter mit ultraschneller Auslösung - Google Patents

Strombegrenzender Schutzschalter mit ultraschneller Auslösung Download PDF

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Publication number
EP0168888A2
EP0168888A2 EP85201125A EP85201125A EP0168888A2 EP 0168888 A2 EP0168888 A2 EP 0168888A2 EP 85201125 A EP85201125 A EP 85201125A EP 85201125 A EP85201125 A EP 85201125A EP 0168888 A2 EP0168888 A2 EP 0168888A2
Authority
EP
European Patent Office
Prior art keywords
lever
arm
movable
contact
movable unit
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.)
Withdrawn
Application number
EP85201125A
Other languages
English (en)
French (fr)
Other versions
EP0168888A3 (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
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 SACE SpA filed Critical SACE SpA
Publication of EP0168888A2 publication Critical patent/EP0168888A2/de
Publication of EP0168888A3 publication Critical patent/EP0168888A3/de
Withdrawn legal-status Critical Current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
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/42—Induction-motor, induced-current, or electrodynamic release mechanisms
    • 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 ultrarapid-release current-limiter switch.
  • the instantaneous opening of the contacts is automatically caused, in case of heavy current overloads due to short-circuits, by the repulsive electrodynamic forces produced by the flow of strong currents of opposite sign inside two portions parallel and suitably close to each other of the current path connecting the movable and stationary contacts of the switch at the power supply and load terminals, said parallel portions being normally constituted by the same supports of the movable contacts and of the stationary contacts.
  • a current-limiter electrical switch as above briefly set forth is known, e.g., from the German Patent N° 2443771 and from the German Patent Application publ. N° 33 36 207.
  • the opening of the contacts by means of the intervention of the release device occurs, in these known switches, as mentioned above, with a certain delay which may result too long for certain practical application requirements. This is due to the fact that the release device is controlled, through suitable mechanisms, by said thermomagnetic devices, so that it has not been possible to date to shorten the intervention times of the release device under certain limits.
  • Purpose of the present invention is to provide a current-limiter electrical switch of the type with contact l opening by rodynamic repulsion in case of heavy current overloads, wherein the release, i.e., the ultimate and long-lasting opening contact, is obtained within still shorter times.
  • This purpose is achieved according to the invention in that a direct link is provided interplaced between the movable contact bearing arm and the final release device of the control mechanism suitable to cause the release directly upon a shift of the movable contact bearing arm by electrodynamic repulsion.
  • Said direct link interplaced between the movable contact bearing arm and the final release device may be simply constituted by a thrust rod assembled in the movable unit supporting the movable contact bearing unit and onto which this latter acts when it is displaced by the repulsive electrodynamic forces in contrast to the action of elastic means, said rod acting in its turn either directly or through a lever on the final element of the release device of the control mechanism of the movable unit.
  • FIG. 1 and 2 are schematic views of a pole of the switch respectively with the contacts closed and with the contacts shown in the first step of the opening movement caused by electrodynamic repulsion.
  • the schematically illustrated switch pole comprises generally a first terminal 10, e.g., connected to the power supply, and a second terminal 11, e.g., connected to a load.
  • a conductor 12 is connected which ends with U-bent portion 13 bearing a stationary contact 14.
  • a movable unit 16 is rotatably assembled wherein an arm 18 bearing a movable contact 19 is supported in a rotatable way around a spindle 17.
  • thermomagnetic release devices known, schematically indicated in 22 and 23.
  • the current path, on stationary contact 14 and movable contact 19 closed, comprises hence two portions parallel and close to each other, constituted by the bent portion 13 of the conductor 12 and by the arm 18 bearing the movable contact 19, along which portions currents of opposite sign flow.
  • thermo-magnetic release devices 22 and 23 are inserted in series.
  • This mechanism comprises a control lever 24 pivoted in 25 and linked, through a a toggle lever, to the movable unit 16.
  • the toggle lever is formed by two links 26 and 27 hinged to each other in 28.
  • the free end of the link 26 is hinged in 29 to the movable unit 16, whilst the free end of the link 27 is hinged in 30 to a lever 31 hinged in 32.
  • an extension spring 34 acts between the hinge 28 connecting the two links 26 and 27 and a point 33 of the control lever 24 .
  • the lever 31 with its point 35 is suitable to abut against a stop 36 constituted by a step of a rotary shaft 37 bearing an arm 38 solid with it.
  • the shaft 37 with its step-shaped stop 36 and with the arm 18 form a release device for the lever 31, which device can be driven by the thermomagnetic release devices 22, 23, through interposed mechanical means, of which a rod 39 is schematically shown suitable to act on the arm 38 to cause the shaft 37 to rotate and thus disengage the stop 36 from the point 35 of the lever 31.
  • the force of the spring 34 via the lever 31 fulcrumed on the rotation pivot 32 brings the toggle lever system 26 and 27 back into the open-contact position.
  • the structure of the switch as it has been herein described is substantially that of the known art and the operating way is also known, including that of the thermomagnetic release devices and of the release devices of the con trol mechanism.
  • the intervention of the release device as obtained in this way requires a certain time, which for particular practical needs may be excessive. This time may be acceptable when the opening of the contacts of the switch is caused by the intervention of the thermic release device and/or of the mag netic release device, i.e. due to currents higher than the calibration currents of the switch, but not high enough as to produce such repulsive electrodynamic forces as to cause the separation of the movable contact bearing arm from the stationary contact, indipendently from a shift ⁇ o( the movable unit on to which the movable contact bearing arm is mounted.
  • the present invention intervenes, which envisages the control of the release device directly by the movable contact bearing arm due to a shift of the same caused by said repulsive electrodynamic forces.
  • the present invention provides to this purpose a thrust rod 40 slidingly assembled inside the movable unit 16 and associated with the arm 18 bearing the movable contact 19.
  • This rod 40 is moreover provided with a concentric spring 41 acting between a shoulder on the movable unit 16 and a small disk 42 solid with the rod 40, in contact with a lever 43 hinged in 44 to the movable unit 16, which lever 43, to the purpose of exerting the necessary pressure on the contacts is pressed in its turn against an idle roller 45 mounted on the rear edge of the arm 18 bearing the movable contact 19.
  • the free end of the thrust rod 40 is extended outwards from the movable unit 16 and is suitable to act on the arm of a bell crank 46, pivoted in 47, the other arm of which cooperates with a second arm 48 solid with the shaft 37 of the release device.
  • the control mechanism is capable of holding the movable unit 16 in its position in which the switch contacts are closed.
  • the arm 18 bearing the movable contact 19 is displaced in contrast with the force of the spring 41 by the repulsive electrodynamic forces (see fig. 2), said arm acts, through the roller 45 and the lever 43, on the thrust rod 40 so as to cause it to protrude outwards from the movable unit 16 to a greater extent, whereby its free end exerts a thrust on the bell crank 46, causing it to rotate clockwise, so as to act on the arm 48 and to cause the shaft 37 to rotate counterclockwise, thus clearing the stop step 36 of the point of the lever 31.
  • the release occurs of the control device and by the action of the spring 34 and with the contribution of the repulsive electrodynamic forces the movable unit 16 is brought to the opening position of switch contacts.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
EP85201125A 1984-07-18 1985-07-09 Strombegrenzender Schutzschalter mit ultraschneller Auslösung Withdrawn EP0168888A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2261684U 1984-07-18
IT2261684U IT8422616V0 (it) 1984-07-18 1984-07-18 Interruttore elettrico limitatore di corrente a sgancio ultrarapido.

Publications (2)

Publication Number Publication Date
EP0168888A2 true EP0168888A2 (de) 1986-01-22
EP0168888A3 EP0168888A3 (de) 1987-05-20

Family

ID=11198474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85201125A Withdrawn EP0168888A3 (de) 1984-07-18 1985-07-09 Strombegrenzender Schutzschalter mit ultraschneller Auslösung

Country Status (2)

Country Link
EP (1) EP0168888A3 (de)
IT (1) IT8422616V0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2785085A1 (fr) * 1998-10-22 2000-04-28 Gen Electric Dispositif articule pliant d'entrainement de bras de contact pour mecanisme de commande de disjoncteur, et disjoncteur comprenant un tel dispositif
EP1261009A2 (de) * 2001-05-22 2002-11-27 AEG Niederspannungstechnik GmbH & Co. KG Auslösevorrichtung eines Schutzschalters und Schutzschaltersystem
DE19830017B4 (de) * 1998-06-26 2005-10-27 Siemens Ag Mehrpoliger strombegrenzender Leistungsschalter
EP2824689A1 (de) * 2013-06-13 2015-01-14 ABB Schweiz AG Dynamischer Auslöser und elektrisches Installationsschaltgerät mit einem dynamischen Auslöser

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1393064A (fr) * 1963-05-16 1965-03-19 Licentia Gmbh Disjoncteur où l'ouverture du système des contacts limite l'intensité du courant
DE1238994B (de) * 1963-06-28 1967-04-20 Licentia Gmbh Selbstschalter, der bei UEberstrom unter der Wirkung des ueber das Kontaktsystem fliessenden Stromes strombegrenzend oeffnet
US3505622A (en) * 1968-11-21 1970-04-07 Ite Imperial Corp Current limiting circuit breaker with collapsible cradle structure
FR2305010A1 (fr) * 1975-03-19 1976-10-15 Licentia Gmbh Disjoncteur limiteur d'intensite
GB2033159A (en) * 1978-10-16 1980-05-14 Westinghouse Electric Corp Current limiting circuit breaker
US4346358A (en) * 1981-01-16 1982-08-24 General Electric Company Contact pop responsive latch release for circuit breakers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1393064A (fr) * 1963-05-16 1965-03-19 Licentia Gmbh Disjoncteur où l'ouverture du système des contacts limite l'intensité du courant
DE1238994B (de) * 1963-06-28 1967-04-20 Licentia Gmbh Selbstschalter, der bei UEberstrom unter der Wirkung des ueber das Kontaktsystem fliessenden Stromes strombegrenzend oeffnet
US3505622A (en) * 1968-11-21 1970-04-07 Ite Imperial Corp Current limiting circuit breaker with collapsible cradle structure
FR2305010A1 (fr) * 1975-03-19 1976-10-15 Licentia Gmbh Disjoncteur limiteur d'intensite
GB2033159A (en) * 1978-10-16 1980-05-14 Westinghouse Electric Corp Current limiting circuit breaker
US4346358A (en) * 1981-01-16 1982-08-24 General Electric Company Contact pop responsive latch release for circuit breakers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19830017B4 (de) * 1998-06-26 2005-10-27 Siemens Ag Mehrpoliger strombegrenzender Leistungsschalter
FR2785085A1 (fr) * 1998-10-22 2000-04-28 Gen Electric Dispositif articule pliant d'entrainement de bras de contact pour mecanisme de commande de disjoncteur, et disjoncteur comprenant un tel dispositif
EP1261009A2 (de) * 2001-05-22 2002-11-27 AEG Niederspannungstechnik GmbH & Co. KG Auslösevorrichtung eines Schutzschalters und Schutzschaltersystem
DE10124985A1 (de) * 2001-05-22 2002-12-12 Aeg Niederspannungstech Gmbh Auslösevorrichtung eines Schutzschalters und Schutzschaltersystem
DE10124985B4 (de) * 2001-05-22 2004-02-05 Aeg Niederspannungstechnik Gmbh & Co Kg Auslösevorrichtung eines Schutzschalters und Schutzschaltersystem
EP1261009A3 (de) * 2001-05-22 2004-10-06 AEG Niederspannungstechnik GmbH & Co. KG Auslösevorrichtung eines Schutzschalters und Schutzschaltersystem
EP2824689A1 (de) * 2013-06-13 2015-01-14 ABB Schweiz AG Dynamischer Auslöser und elektrisches Installationsschaltgerät mit einem dynamischen Auslöser

Also Published As

Publication number Publication date
IT8422616V0 (it) 1984-07-18
EP0168888A3 (de) 1987-05-20

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Inventor name: MOSTOSI, ANGELO