EP0466287A2 - Disjoncteur avec un dispositif d'encliquetage indépendant du contact mobile - Google Patents

Disjoncteur avec un dispositif d'encliquetage indépendant du contact mobile Download PDF

Info

Publication number
EP0466287A2
EP0466287A2 EP91250158A EP91250158A EP0466287A2 EP 0466287 A2 EP0466287 A2 EP 0466287A2 EP 91250158 A EP91250158 A EP 91250158A EP 91250158 A EP91250158 A EP 91250158A EP 0466287 A2 EP0466287 A2 EP 0466287A2
Authority
EP
European Patent Office
Prior art keywords
shaft
lever
circuit breaker
latching
switching
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
EP91250158A
Other languages
German (de)
English (en)
Other versions
EP0466287A3 (en
EP0466287B1 (fr
Inventor
Günter Dipl.-Ing. Seidler-Stahl
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0466287A2 publication Critical patent/EP0466287A2/fr
Publication of EP0466287A3 publication Critical patent/EP0466287A3/de
Application granted granted Critical
Publication of EP0466287B1 publication Critical patent/EP0466287B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H01H71/505—Latching devices between operating and release mechanism
    • H01H2071/507—Latching devices between operating and release mechanism being collapsible, e.g. yielding elastically, when the opening force is higher than a predetermined value
    • 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
    • H01H71/505—Latching devices between operating and release mechanism

Definitions

  • the invention relates to a circuit breaker with a fixed switching contact and a movable switching contact that can be actuated relative to it by a drive device for switching on and off, and with a tripping device for automatic separation of the switching contacts when a current of impermissible height occurs, wherein a mechanical part of the tripping device rotates one mounted trigger shaft and a ratchet lever which can be supported on the trigger shaft with interacting latching surfaces are arranged, and furthermore a latching device which is independent of the triggering device is provided for releasing the movable switching contact under the influence of a faulty high current.
  • a circuit breaker of this type is known from US-A-4,760,224.
  • the independent latching device is formed in this circuit breaker by a spring-loaded roller and a cam with a locking step for the roller.
  • This arrangement is located in the course of the power transmission between the ratchet lever which can be supported by the release shaft and a toggle lever system which transmits the driving force to the movable contact lever.
  • this arrangement is provided only once, so that the independent latching device responds when the sum of the repulsive force occurring on all movable contact levers present exceeds the holding force of the latching device.
  • the invention is based on the object of substantially designing the independent latching device to simplify and at the same time ensure the repeatability of the value of the force at which the latching device is released.
  • this object is achieved in that the release shaft is guided along guide parts against a restoring force while reducing the overlap between the latching surfaces provided on the release shaft and the ratchet lever.
  • the essential simplification is achieved in that the new latching device does not require a cam disk or a roller, because the existing latching point between the trigger shaft and the latch lever is also used for the force-dependent release. Since precision parts are always used at this point, their reliability also has an effect on force-dependent unlatching.
  • a toggle lever supported by the ratchet lever of a toggle lever system arranged in the course of the power transmission to the movable switching contact is provided with a support surface which is concentric with its pivot bearing in such an arrangement that the trigger shaft during power transmission when switched on is supported against displacement along the guide parts. The temporary support is released at the end of the reset process, so that the readiness for all intended functions is restored.
  • the trigger shaft can have a latching surface designed as a half-shaft.
  • the displaceability of the trigger shaft can be brought about in that the trigger shaft is guided in elongated holes arranged on both sides of the latching surface and is supported by leaf springs.
  • the rotatability and displaceability of the trigger shaft is achieved in a simple and reliable manner.
  • Figure 1 shows partially in section the switching mechanism of a low-voltage circuit breaker with open switch contacts.
  • FIG. 2 shows the switching mechanism according to FIG. 1 with closed switching contacts.
  • FIG. 3 shows the switching mechanism according to the preceding figures after unlatching due to a faulty high current.
  • an isolated, supported switching contact 1 which has a switching piece 2 and an arcing horn 4.
  • a connecting bar 5 forms the power supply to this switch contact.
  • a movable switching contact 6 comprises a contact lever 7 with a contact piece 10.
  • the contact lever 7 is pivotable on a carrier 12 about a hinge pin 13, while the carrier 12 is in turn pivotable about a fixed hinge pin 14.
  • a flexible current band 15 composed of a plurality of thin foils forms a movable connection between the lower end of the contact lever 7 and a further stationary connecting rail 16.
  • the two connecting rails 5 and 16 are fastened to an insulating support body 17.
  • a quenching chamber 8 assigned to the switching contacts 1 and 6 is shown broken off.
  • a drive device designated as a whole by 18, is provided for actuating the movable switching contact 6.
  • This comprises an energy store 20 having helical springs and a multi-unit toggle lever system with an upper isolating coupling 21, two middle toggle levers 22 and 23 and a drive lever 24.
  • a driver 25 is inserted between the energy store 20 and the drive lever 24.
  • a support lever 26 acts on the joint between the middle toggle levers 22 and 23, the other end of which is connected in an articulated manner to a stationary latch lever 27.
  • a flat latching surface 30 at the end of the latch lever 27 is opposite a latching surface 32 of a release shaft 31 which is designed as a half-shaft.
  • the trigger shaft 31 is guided on both sides of the latching surface 32 in an elongated hole 40 and is supported by a leaf spring 41 which is supported in a stationary manner at both ends.
  • the elongated holes can be located in boards that limit the toggle lever arrangement, or in separate wall parts.
  • the leaf spring 41 is dimensioned such that it supports the force transmitted in the switched-on state from the toggle lever system via the support lever 26 and the ratchet lever 27 due to the lever ratios.
  • the drive lever 24 has a support surface 42 which is arranged concentrically with a stationary bearing pin 43. In the position of the parts according to FIG. 1, the beginning of this support surface 42 is below the trigger shaft 31, while in the switch-on position according to FIG.
  • the support surface 42 is completely moved past the trigger shaft 31.
  • the trigger shaft 31 is rotated clockwise by a small angle. This can be done, for example, by means of a conventional triggering device, which comprises a combined magnetic-thermal trigger or an electronic trigger having the same and further functions, and a trigger magnet.
  • a conventional triggering device which comprises a combined magnetic-thermal trigger or an electronic trigger having the same and further functions, and a trigger magnet.
  • the latching surface 30 loses its support on the latching surface 32 of the trigger shaft 31, so that contact force and switch-off springs (not shown) acting on the movable switching contact 7 and the toggle lever system can buckle. The parts then assume the position shown in FIG. 3.
  • the same effect can also occur if electrodynamic repulsive forces caused by a high fault current between the switching contacts 1 and 6 increase the force acting on the latching surfaces 30 and 32 in such a way that the trigger shaft 31 along the guide formed by the elongated holes 40 counteracts the Preload force of the leaf spring 41 is shifted. Since the pawl lever 27 is pivotable about a rotary bearing while the trigger shaft 31 is guided in a straight slot guide, the overlap between the two changes when the trigger shaft 31 is displaced Latching surfaces 30 and 32 to the extent that the latch lever 27 is released, thereby immediately separating the switching contacts 1 and 6 independently of a triggering device acting on the switching shaft 31.
  • the circuit breaker is able to react to faulty high currents with a current-limiting opening in its switching contacts. This process begins much more quickly than the rotation of the trigger shaft caused by a conventional trigger device.
  • the decisive factor here is the total force occurring between the latching surfaces 30 and 32, which not only results from the switching contacts 1 and 6 shown, but also from the further switch poles due to the transmission by means of the switching shaft 36 and the crank arms 35. The position of the parts according to FIG. 3 again occurs.
  • the switching mechanism 20 is prepared for renewed engagement by resetting the pawl lever 27 with the support lever 26 and the toggle levers 22 and 23 until the latching surfaces 30 and 32 face each other again.
  • the trigger shaft 31 When the trigger shaft 31 is switched on, it is prevented from deflecting against the pretensioning force of the leaf spring 41 by the support surface 42 of the drive lever 24 passing beneath it, so that a reliable switch-on can take place.
  • the biasing force of the leaf spring 41 alone is sufficient.
  • the support surface 42 is then again outside the area in which the trigger shaft 31 is displaceable.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
EP91250158A 1990-07-10 1991-06-13 Disjoncteur avec un dispositif d'encliquetage indépendant du contact mobile Expired - Lifetime EP0466287B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4022078 1990-07-10
DE4022078A DE4022078A1 (de) 1990-07-10 1990-07-10 Leistungsschalter mit unabhaengiger verklinkungseinrichtung des bewegbaren schaltkontaktes

Publications (3)

Publication Number Publication Date
EP0466287A2 true EP0466287A2 (fr) 1992-01-15
EP0466287A3 EP0466287A3 (en) 1993-04-21
EP0466287B1 EP0466287B1 (fr) 1995-01-18

Family

ID=6410078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250158A Expired - Lifetime EP0466287B1 (fr) 1990-07-10 1991-06-13 Disjoncteur avec un dispositif d'encliquetage indépendant du contact mobile

Country Status (3)

Country Link
EP (1) EP0466287B1 (fr)
JP (1) JPH04351824A (fr)
DE (2) DE4022078A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997000531A1 (fr) * 1995-06-19 1997-01-03 Siemens Aktiengesellschaft Dispositif de protection contre les surcharges des contacts de commutation d'un appareil de commutation
FR2744563A1 (fr) * 1996-02-06 1997-08-08 Schneider Electric Sa Mecanisme de commande d'un disjoncteur a verrou debrayable sur un court-circuit
WO2005029526A1 (fr) * 2003-09-19 2005-03-31 Siemens Aktiengesellschaft Commutateur electrique dote de surfaces d'encliquetage deplacees sous l'influence d'une force electrodynamique

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9206137U1 (de) * 1992-05-07 1993-09-09 Siemens Ag Leistungsschalter mit einem Schaltschloß
DE4221277A1 (de) * 1992-06-26 1994-01-05 Siemens Ag Niederspannungs-Leistungsschalter mit einer Verklinkungseinrichtung zur Offenhaltung der Kontaktanordnung
DE19527045C2 (de) * 1995-07-25 2002-02-14 Abb Patent Gmbh Kontaktanordnung für ein elektrisches Schaltgerät
DE19727853C1 (de) * 1997-06-26 1998-11-26 Siemens Ag Niederspannungs-Leistungsschalter mit einer Schaltwelle
DE19910172B4 (de) * 1999-02-24 2006-07-06 Siemens Ag Leistungsschalter mit strombegrenzender Öffnung von Schaltkontakten
DE29921347U1 (de) * 1999-11-30 2001-04-05 Siemens Ag Leistungsschalter mit strombegrenzender Öffnung eines Schaltkontaktes
DE10164517B4 (de) * 2001-12-19 2004-02-19 Siemens Ag Strombegrenzender Niederspannungs-Leistungsschalter
DE102007001471A1 (de) * 2007-01-05 2008-07-10 Siemens Ag Elektrische Schalteinrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072972A2 (fr) * 1981-08-22 1983-03-02 Licentia Patent-Verwaltungs-GmbH Disjoncteur automatique
EP0197739A2 (fr) * 1985-03-28 1986-10-15 Mitsubishi Denki Kabushiki Kaisha Disjoncteur à coupure dans l'air

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072972A2 (fr) * 1981-08-22 1983-03-02 Licentia Patent-Verwaltungs-GmbH Disjoncteur automatique
EP0197739A2 (fr) * 1985-03-28 1986-10-15 Mitsubishi Denki Kabushiki Kaisha Disjoncteur à coupure dans l'air

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997000531A1 (fr) * 1995-06-19 1997-01-03 Siemens Aktiengesellschaft Dispositif de protection contre les surcharges des contacts de commutation d'un appareil de commutation
US5933303A (en) * 1995-06-19 1999-08-03 Siemens Aktiengesellschaft Device for protection against overload of the switch contacts of a switching device
FR2744563A1 (fr) * 1996-02-06 1997-08-08 Schneider Electric Sa Mecanisme de commande d'un disjoncteur a verrou debrayable sur un court-circuit
EP0789380A1 (fr) * 1996-02-06 1997-08-13 Schneider Electric Sa Mécanisme de commande d'un disjoncteur à verrou débrayable sur un court-circuit
US5731560A (en) * 1996-02-06 1998-03-24 Schneider Electric Sa Operating mechanism of a circuit breaker with a locking system disengageable on a short circuit
WO2005029526A1 (fr) * 2003-09-19 2005-03-31 Siemens Aktiengesellschaft Commutateur electrique dote de surfaces d'encliquetage deplacees sous l'influence d'une force electrodynamique

Also Published As

Publication number Publication date
DE59104298D1 (de) 1995-03-02
DE4022078A1 (de) 1992-01-16
JPH04351824A (ja) 1992-12-07
EP0466287A3 (en) 1993-04-21
EP0466287B1 (fr) 1995-01-18

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