WO2012090037A1 - Disjoncteur - Google Patents

Disjoncteur Download PDF

Info

Publication number
WO2012090037A1
WO2012090037A1 PCT/IB2011/002518 IB2011002518W WO2012090037A1 WO 2012090037 A1 WO2012090037 A1 WO 2012090037A1 IB 2011002518 W IB2011002518 W IB 2011002518W WO 2012090037 A1 WO2012090037 A1 WO 2012090037A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit breaker
transmission mechanism
wire rope
spring
movable contact
Prior art date
Application number
PCT/IB2011/002518
Other languages
English (en)
Inventor
Subbiahthever Dukkaiappan
Bhushan KULKARNI
Prasad DEOLE
Vikas Viswarao JAKATE
Original Assignee
Abb Technology 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 Abb Technology Ltd filed Critical Abb Technology Ltd
Publication of WO2012090037A1 publication Critical patent/WO2012090037A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/36—Driving mechanisms, i.e. for transmitting driving force to the contacts using belt, chain, or cord
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H2003/323—Driving mechanisms, i.e. for transmitting driving force to the contacts the mechanisms being adjustable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • 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

Definitions

  • the invention relates to a circuit breaker, and more particularly to the transmission mechanism of a circuit breaker.
  • Circuit breaker is an electrical switch that is generally provided in power distribution for protecting the electrical circuit from damage caused due to overload or short circuit. Circuit breaker protects the electrical circuit by detecting fault in the electrical circuit and discontinuing the electrical flow by interrupting the current. Circuit breaker can be reset either manually or automatically to resume operation so as to allow electrical flow though the electrical circuit.
  • a circuit breaker comprises a linkage mechanism for transmitting the energy or motion from the operating mechanism to the moving contact of the pole of the circuit breaker.
  • the transmission of energy or motion is enabled through linkages provided in the linkage mechanism.
  • the linkage mechanism is also referred to as transmission mechanism.
  • the transmission mechanism of the circuit breaker has linkages or links with fixed leverage ratio or adjustable leverage ratio.
  • Links with fixed leverage ratio has solid links and hence cannot be adjusted.
  • the contacts of the circuit breaker employing links with fixed leverage ratio experiences stress due to closing bounce of the solid links or that during opening operation. This increases the possibility of fatigue failure of the relevant and related components of the circuit breaker.
  • the manufacturing cost of the circuit breaker also increases with the addition of more and more materials, and also making the construction of the transmission mechanism and of the circuit breaker more complicated.
  • links with adjustable leverage ratio has at least one joint, but typically many joints, through which flexibility in the length of the link is achieved. Therefore, the transmission mechanism of the type having links with adjustable leverage ratio encounters transmission loss due to friction caused by the links and its joints. This requires more energy from the operating mechanism to overcome such transmission loss. Also, adjusting the length of the links involve suitably tightening the joints catering to the designed torque so as to eliminate the chances of the joints getting loose, without which the circuit breaker or of the components relating to the transmission mechanism of the circuit breaker, becomes vulnerable to permanent damage.
  • the present invention provides a circuit breaker comprising a transmission mechanism.
  • the transmission mechanism is connected to an appropriate link of the operating mechanism of the circuit breaker at one end and to the movable contact of the circuit breaker at the other end.
  • the transmission mechanism of the circuit breaker is provided for transmitting the movement provided by the operating mechanism to the movable contact.
  • the transmission mechanism comprises at least one wire rope connected to the operating mechanism at its one end and to a lever at its other end for operating the movable contact, and the wire rope is movable over a pulley.
  • Fig. 1 shows a circuit breaker with solid link in accordance with the prior art
  • Fig. 2 shows a circuit breaker with wire rope in accordance with the invention
  • Figs. 2a and 2b show variants of the circuit breaker with wire rope in accordance with the invention in which each phase of the circuit breaker is operated independently;
  • Figs. 2c and 2d show variants of the circuit breaker with wire rope in accordance with the invention in which the three phases of the circuit breaker is operated through a common shaft.
  • a circuit breaker ( 100) in accordance with the prior art is shown.
  • the transmission mechanism of the circuit breaker ( 100) comprises a solid link ( 1 01 ).
  • the solid link ( 101 ) is connected at its one end to the operating mechanism ( 102) and at its other end to a lever ( 103) for operating the movable contact of the circuit breaker ( 100).
  • the solid link ( 101 ) has fixed leverage ratio and cannot be adjusted.
  • the circuit breaker ( 100) experiences stress due to closing bounce of the solid links or that during opening operation.
  • circuit breaker of the invention is further explained herein after with reference to non exhaustive exemplary embodiments illustrated by Figs. 2 through 2d.
  • a circuit breaker (200) in which the transmission mechanism of the circuit breaker (200) has a wire rope (201 ) movable or sliding over a pulley (204).
  • the wire rope (201 ) is connected at its one end to an operating mechanism (202) and at its other end to a lever (203) for operating the movable contact of the circuit breaker (200).
  • the pulley (204) is adjustable in respect of its position and provides required tension for the wire rope (201 ) which is a requisite for proper movement and functioning of the transmission mechanism.
  • the operating mechanism (202) provides energy and of the motion required to be transmitted to the movable contact through the transmission mechanism.
  • the energy can be produced by a suitable source that may be automatic such as motor, or manual.
  • the operating mechanism (202) through its corresponding movement pulls the wire rope (201 ).
  • the wire rope (201 ) moves or slides over the rotatable pulley (204), and in turn moves the lever (203) against the force of the compression spring (205) that is provided along with a guide to hold the compression spring (205) in its position, and being disposed accordingly within the circuit breaker (200).
  • the compression spring gets charged due to compression caused due to the movement of the lever (203).
  • the closing operation entails the movable contact to engage with the fixed contact of the circuit breaker (200) to close the electrical circuit.
  • the movement of the operating mechanism (202) is arrested by a latch provided for the said purpose.
  • the latch During the opening operation, the latch is released allowing movement of the operating mechanism and of the transmission mechanism.
  • the compression spring (205) moves the lever (203) away from it and against the force of the damper (206), which is a compression spring, utilizing the charge accumulated during the closing operation.
  • the damper (206) is provided to counter or eliminate the bounce exhibited during the closing and / or opening operation. It is to be noted through this, that the invention renders the circuit breaker (200) to a critically damped system as compared to the under damped system of the prior art. This eliminates the negative feedback and reduces the time required to reach equilibrium position.
  • This embodiment corresponds to a circuit breaker in which each phase operates independently.
  • Figs. 2a and 2b shows other non limited variants of the circuit breaker (200) in which each phase of the circuit breaker (200) operates independently.
  • the primary constructional difference of Figs. 2a and 2b as compared with Fig. 2 is that in Figs. 2a and 2b the damper (206) is a tension spring that been coupled to the operating mechanism (202). With respect to Fig. 2b, the movement of the lever during opening operation is caused by the pull of the tension spring (205) provided for the purpose served by the compression spring (205) of Fig. 2 or 2a.
  • Figs. 2c and 2d purports to embodiments that correspond to a circuit breaker (200) in which the three phases are connected by a common shaft (207). Constructionally, Figs. 2c and 2d correspond to Figs. 2a and 2b respectively.
  • circuit breaker (200) of Figs. 2a through 2d is similar to the circuit breaker (200) of Fig. 2.
  • the adjustable leverage ratio is achievable by suitably adjusting the position of the pulley and / or by suitably adjusting the lever or link connecting the wire rope with the movable contact. It is to be noted that various other combination of compression spring and tension spring for the purpose of causing movement to the lever during opening operation and as damper is possible, and each of such other variants that not been specifically mentioned here in the description can be well understood by a person skilled in the art.
  • the invention provides a circuit breaker that has fixed leverage ratio or adjustable leverage ratio or both, and has reduced or negligible transmission loss without much of joints and friction thereof.
  • the circuit breaker of the invention has improved or increased transmission efficiency, and has transmission mechanism that is capable of withstanding dynamic loads. Besides this, circuit breaker of the invention is compact and simple in construction and durable and functionally more reliable.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

La présente invention concerne un disjoncteur comprenant un mécanisme de transmission. Le mécanisme de transmission est raccordé à une liaison appropriée du mécanisme d'actionnement du disjoncteur au niveau d'une de ses extrémités et au contact mobile du disjoncteur au niveau de son autre extrémité. Le mécanisme de transmission du disjoncteur sert à transmettre le mouvement fourni par le mécanisme d'actionnement au contact mobile. Le mécanisme de transmission comprend au moins un câble métallique raccordé au mécanisme d'actionnement au niveau d'une de ses extrémités et à un levier au niveau de son autre extrémité, en vue d'actionner le contact mobile, le câble métallique pouvant se déplacer sur une poulie.
PCT/IB2011/002518 2010-12-31 2011-10-21 Disjoncteur WO2012090037A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN4047CH2010 2010-12-31
IN4047/CHE/2010 2010-12-31

Publications (1)

Publication Number Publication Date
WO2012090037A1 true WO2012090037A1 (fr) 2012-07-05

Family

ID=45563441

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/002518 WO2012090037A1 (fr) 2010-12-31 2011-10-21 Disjoncteur

Country Status (1)

Country Link
WO (1) WO2012090037A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1016799B (de) * 1954-03-01 1957-10-03 Voigt & Haeffner Ag Schaltschloss fuer Niederspannungs-Leistungsschalter
FR2559616A1 (fr) * 1984-02-14 1985-08-16 Merlin Gerin Bloc auxiliaire de commande a distance d'un disjoncteur electrique
WO2009144297A1 (fr) * 2008-05-30 2009-12-03 Areva T&D Ag Commande pour appareil electrique haute et moyenne tension a temps d'actionnement reduite

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1016799B (de) * 1954-03-01 1957-10-03 Voigt & Haeffner Ag Schaltschloss fuer Niederspannungs-Leistungsschalter
FR2559616A1 (fr) * 1984-02-14 1985-08-16 Merlin Gerin Bloc auxiliaire de commande a distance d'un disjoncteur electrique
WO2009144297A1 (fr) * 2008-05-30 2009-12-03 Areva T&D Ag Commande pour appareil electrique haute et moyenne tension a temps d'actionnement reduite

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