WO2012120327A1 - Mécanisme de verrou amélioré destiné à être utilisé dans des disjoncteurs - Google Patents

Mécanisme de verrou amélioré destiné à être utilisé dans des disjoncteurs Download PDF

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Publication number
WO2012120327A1
WO2012120327A1 PCT/IB2011/001795 IB2011001795W WO2012120327A1 WO 2012120327 A1 WO2012120327 A1 WO 2012120327A1 IB 2011001795 W IB2011001795 W IB 2011001795W WO 2012120327 A1 WO2012120327 A1 WO 2012120327A1
Authority
WO
WIPO (PCT)
Prior art keywords
latch
trip
bracket
latch bracket
link
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.)
Ceased
Application number
PCT/IB2011/001795
Other languages
English (en)
Inventor
Sujit S. PATWARDHAN
Rubin CHOLERA
Yogesh N. PATIL
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.)
Larsen and Toubro Ltd
Original Assignee
Larsen and Toubro Ltd
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 Larsen and Toubro Ltd filed Critical Larsen and Toubro Ltd
Publication of WO2012120327A1 publication Critical patent/WO2012120327A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • 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
    • 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
    • H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure

Definitions

  • the present invention relates to circuit breakers. More particularly, the invention relates to an enhanced latch mechanism for use in molded case circuit breakers which trip the circuit breakers with decreased trip force.
  • Circuit breakers are mechanical switching devices capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified time and breaking currents under specified abnormal conditions.
  • a circuit breaker basically consists of a pair of separable contacts and an interrupting medium. The function of the contacts is to conduct the electrical current when the breaker is closed and to withstand the arcs while interrupting.
  • the electrical contacts have a stationary part and a moving part. By bringing the moving contact to touch the stationary contact, an electric current flows and the breaker is closed. By driving the moving contact away from the stationary contact, an electric arc is developed and by quenching the electrical arc, the flow of electrical current is stopped and the breaker is opened.
  • US6727788 discloses an apparatus for operating a circuit breaker.
  • the circuit breaker includes a housing, a cradle mounted in the housing and coupled to a handle and to a movable contact.
  • the apparatus comprises a latch frame mounted in the circuit breaker housing.
  • a reset pin is mounted on the cradle.
  • a latch member is configured to selectively engage the reset pin and the latch member is rotatably coupled to the latch frame.
  • a latch shaft assembly is rotatably mounted in the latch frame and selectively engaged by the latch member. Upon rotation of the latch shaft assembly, the latch shaft assembly will disengage from the latch member and cause the movable contact to move.
  • US6218919 discloses a decreased mechanical trip time latching system for use in a molded case circuit breaker assembly.
  • the latching system comprising a quick release primary latch having a first primary latching surface and a second primary latching surface. Where the second primary latching surface engages a first secondary latching surface located on an interactive secondary latch, to prevent the rotation of the quick release primary latch.
  • the first primary latching surface engages a cradle latching surface, located on a cradle, to prevent the rotation of the cradle.
  • Assembled to the interactive secondary latch is a trip bar.
  • Activation of the trip bar rotates the secondary latch so that the first secondary latching surface moves out of contact with the second primary latching surface just prior to the interactive secondary latch making physical contact with the quick release primary latch.
  • the quick release primary latch then rotates moving the first primary latching surface out of contact with the cradle latching surface thereby releasing the cradle.
  • the cradle rotates and the operating system is activated to terminate current flow.
  • US7268654 discloses a latching mechanism for a movable member mounted for movement between first and second positions.
  • the latching mechanism includes a primary latching mechanism mounted for movement between a latched position where the primary latching mechanism engages the movable member to allow the movable member to move between the first and second positions, and an unlatched position where the movable member is disengaged for movement to the second position.
  • a secondary latching element engages the first latching mechanism to hold the primary latching mechanism in the latched position, the secondary latching element being movable to move the primary latching mechanism to the unlatched position while remaining in engagement with the primary latching mechanism.
  • US 6590482 discloses a latching mechanism which includes a pair of cradles. Mechanism linkages are connected to the each cradle and these pair of cradle is connected to each other. Primary latch is engaged with the cradle. A secondary latch element is engages the primary latch which being movable to move the primary latching mechanism
  • One object of the present invention is to overcome the disadvantages/drawbacks of the prior art.
  • a basic object of the present invention is to provide a latch mechanism for the circuit breakers which enables to trip the circuit breaker when trip signal is actuated.
  • Another object of the present invention is to provide a latch mechanism for circuit breakers in which rolling co-efficient of friction plays role in deciding the trip force required for tripping the circuit breaker.
  • an enhanced latch mechanism for use in molded case circuit breakers, said mechanism comprising :
  • latch bracket means comprising plurality of slot means
  • latch link means comprising plurality of slot means being movably engaged with said latch bracket means; said latch means being operatively engaged with conventional moving contact of said circuit breaker through linkages.;
  • locking trip plate means adapted to lock said latch bracket means
  • said latch link means comprising a reset pin means accommodated in said slots of said latch link means such that assembly of said latch link means and reset pin means being movably located on said latch bracket means such that on rotation of said locking trip plate means actuated by a conventional trip signal, said latch bracket means get unlocked resulting in unlocking of said latch link means whereby said unlocking of latch link means being performed by rolling movement of said reset pin means providing rotation of said latch link means adapted to rotate the moving contact through linkages, so as to move it away from fixed contact of the circuit breaker.
  • Fig. 1 illustrates Isometric view of the 3 pole Circuit Breaker cassette with breaker is in ON condition
  • Fig. 2 illustrates Isometric view of the single pole Circuit Breaker cassette with breaker is in ON condition
  • Fig.3 illustrates Isometric view of Mechanism in ON condition with breaker cassette hidden
  • Fig. 4 illustrates front view of Mechanism in ON position.
  • Fig. 5 illustrates isometric view of Latch Link
  • Fig. 6 illustrates isometric view of Latch Bracket
  • Fig. 7 illustrates isometric view of Trip Plate
  • Fig.8 illustrates sectional view of Mechanism in TRIP position.
  • Fig.9 illustrates front view of Mechanism in Trip position.
  • Fig.10 illustrates front view of mechanism in intermediate TRIP to RESET position.
  • Fig.l 1 illustrates sectional view of mechanism in intermediate TRIP to RESET position.
  • Fig.12 illustrates front view of mechanism in next intermediate TRIP to RESET position.
  • Fig.13 illustrates front view of mechanism in Reset position.
  • the present invention relates to a Circuit Breaker which is a mechanical switching device, capable of making (i.e. switching ON), carrying and breaking (i.e. switching OFF) current under normal circuit conditions and more specifically breaking current (Tripping) during abnormal circuit conditions such as short-circuit. Quite often, the short circuit current is sensed automatically and the signal is given to the mechanism as a TRIP command which leads to opening of the contacts by means of mechanism.
  • Circuit breaker cassette It is a cassette on which circuit breaker mechanism module is mounted.
  • Rotor It is a part which houses moving contact assembly 3: Mechanism module with Latch Mechanism: It consists of various linkages. It is a 4 bar mechanism. It also consists of Latch Mechanism.
  • Latch Link - It is a part of Latch Mechanism. It moves during ON to TRIP operation . It comprises of plurality of slots. Further an oblong shaped slot 7 is also present in which reset pin 3b is operatively engaged and provides rolling motion to the latch link 3 a.
  • Latch Bracket It is a part which locks the Latch link during ON-OFF and OFF-ON operation. It is locked by the Trip Plate. It comprises plurality of slots 8 for accommodating reset pin means 3d.
  • the latch bracket means 3c comprises at least two projection 10 which help in reseting of Latch Bracket to its original position with the help of Latch Link so no Biasing spring is required to Latch Bracket..
  • Latching roller - It is connected to the Latch Bracket. It locks the Latch Link during ON- OFF and OFF-ON operation & rolls over Latch Link while unlocking the Latch Link.
  • Trip Plate Spring It is a biasing spring used for Trip Plate.
  • Dead centre- Dead centre is an equilibrium condition of actuating mechanism. In this condition the mechanism spring is fully charged and beyond this point mechanism flips & operates independently due to energy discharged by mechanism spring.
  • Circuit breaker Latch Mechanism consists of Latch Link(3a), Reset pin (3b),Latch Bracket(3c),Latching roller(3d),Trip Plate(3e) and Trip Plate Spring(3f).
  • Latch Link(3a) is locked by Latching Roller(3d) which is connected to Latch Bracket(3c).
  • Latch Bracket(3c) is locked by Trip Plate(3e).
  • Fig.3 shows the mechanism in On condition.
  • Trip signal is given to the Trip Plate (3e) by the actuator, Trip Plate rotates and unlock the Latch Bracket (3c).Unlocking of Latch Bracket (3c) results in unlocking of Latch Link(3a).
  • Rotation of Latch Link(3a) causes rotation of Moving Contact(4) away from Fixed Contact(5) and breaker is in Trip condition as shown in the fig.8 and fig.9.Side plate work as a stopper for both Latch Link and Latch Bracket.
  • Trip Spring(3f) gets charged which helps in brining the Trip Plate(3e) in original position.
  • Trip Spring (3f) is connected between the Trip Plate(3) and Side Plates..
  • Latch Link(3a) is rotated by the Fork Link through Rest Pin(3b) inserted in it.
  • Fig.10 and Fig.l 1 shows the intermediate position from TRIP to RESET.
  • Latch Bracket(3c) is not able to come to its original position as there is always contact between Latch Link(3a) and Latching Roller(3d).
  • Fig.12 shows next intermediate position between TRIP to RESET.
  • Latching Roller pin reduces the friction between Latch Link and Latch Bracket as there exist rolling coefficient of friction.
  • ⁇ Roller pin ensures the sufficient overlap area between Latch Bracket and Latch Link which not cause the unexpected unlocking of the Latch Link due to wear in contact area.

Landscapes

  • Breakers (AREA)

Abstract

La présente invention a trait à un mécanisme de verrou amélioré destiné à être utilisé dans des disjoncteurs à boîtier moulé. Le mécanisme comprend un moyen de support de la clenche (3c) qui comprend une pluralité de moyens de fente (8), un moyen de liaison de verrou (3a) qui comprend une pluralité de moyens de fente (7) qui sont mis en prise de façon amovible avec le moyen de support de la clenche (3a) et un moyen de plaque de déclenchement de verrouillage (3e). Le moyen de verrou est mis en prise avec un contact mobile classique du disjoncteur.
PCT/IB2011/001795 2011-03-07 2011-08-01 Mécanisme de verrou amélioré destiné à être utilisé dans des disjoncteurs Ceased WO2012120327A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN635MU2011 2011-03-07
IN635/MUM/2011 2011-03-07

Publications (1)

Publication Number Publication Date
WO2012120327A1 true WO2012120327A1 (fr) 2012-09-13

Family

ID=44720041

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/001795 Ceased WO2012120327A1 (fr) 2011-03-07 2011-08-01 Mécanisme de verrou amélioré destiné à être utilisé dans des disjoncteurs

Country Status (1)

Country Link
WO (1) WO2012120327A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022135044A1 (fr) * 2020-12-25 2022-06-30 浙江奥来电器有限公司 Dispositif de verrouillage de disjoncteur

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0555158A1 (fr) * 1992-02-07 1993-08-11 Schneider Electric Sa Mécanisme de commande d'un disjoncteur à boîtier moulé
EP0798755A2 (fr) * 1996-03-26 1997-10-01 Eaton Corporation Mécanisme de verrouillage et de déclenchement à rouleau, pour appareil de commutation
EP0954002A2 (fr) * 1998-04-29 1999-11-03 AEG Niederspannungstechnik GmbH & Co. KG Disjoncteur magnéto-thermique
US6218919B1 (en) 2000-03-15 2001-04-17 General Electric Company Circuit breaker latch mechanism with decreased trip time
US6590482B2 (en) 2000-03-01 2003-07-08 General Electric Company Circuit breaker mechanism tripping cam
US6727788B1 (en) 2002-06-20 2004-04-27 Siemens Energy & Automation, Inc. Latch mechanism for a circuit breaker
US7268654B2 (en) 2003-12-31 2007-09-11 Square D Company Circuit breaker latching mechanism

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0555158A1 (fr) * 1992-02-07 1993-08-11 Schneider Electric Sa Mécanisme de commande d'un disjoncteur à boîtier moulé
EP0798755A2 (fr) * 1996-03-26 1997-10-01 Eaton Corporation Mécanisme de verrouillage et de déclenchement à rouleau, pour appareil de commutation
EP0954002A2 (fr) * 1998-04-29 1999-11-03 AEG Niederspannungstechnik GmbH & Co. KG Disjoncteur magnéto-thermique
US6590482B2 (en) 2000-03-01 2003-07-08 General Electric Company Circuit breaker mechanism tripping cam
US6218919B1 (en) 2000-03-15 2001-04-17 General Electric Company Circuit breaker latch mechanism with decreased trip time
US6727788B1 (en) 2002-06-20 2004-04-27 Siemens Energy & Automation, Inc. Latch mechanism for a circuit breaker
US7268654B2 (en) 2003-12-31 2007-09-11 Square D Company Circuit breaker latching mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022135044A1 (fr) * 2020-12-25 2022-06-30 浙江奥来电器有限公司 Dispositif de verrouillage de disjoncteur

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