EP1014415B1 - Disjoncteur - Google Patents

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Publication number
EP1014415B1
EP1014415B1 EP19990124033 EP99124033A EP1014415B1 EP 1014415 B1 EP1014415 B1 EP 1014415B1 EP 19990124033 EP19990124033 EP 19990124033 EP 99124033 A EP99124033 A EP 99124033A EP 1014415 B1 EP1014415 B1 EP 1014415B1
Authority
EP
European Patent Office
Prior art keywords
engagement means
toggle link
closing
circuit breaker
latch
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 - Lifetime
Application number
EP19990124033
Other languages
German (de)
English (en)
Other versions
EP1014415A1 (fr
Inventor
Masao Horikawa
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.)
Terasaki Electric Co Ltd
Original Assignee
Terasaki Electric Co 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 Terasaki Electric Co Ltd filed Critical Terasaki Electric Co Ltd
Publication of EP1014415A1 publication Critical patent/EP1014415A1/fr
Application granted granted Critical
Publication of EP1014415B1 publication Critical patent/EP1014415B1/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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts

Definitions

  • the present invention relates to a technique for improving a short circuit breaking performance of a circuit breaker.
  • a structure of a circuit breaker includes a terminal connected to an electric circuit, opening/closing contacts connected to the terminal, an opening/closing mechanism operating the opening/closing contacts, a closing operation device closing the opening/closing contacts through the operation of the opening/closing mechanism, an overcurrent tripping device, a tripping mechanism opening the opening/closing contacts through the operation of the opening/closing mechanism when the overcurrent tripping device operates.
  • the overcurrent tripping device is constituted according to a circuit protection system from a combination of a long time tripping element performing a tripping operation after a relatively long time from starting of overcurrent flow, a short time tripping element performing the tripping operation after a predetermined short time from the starting of the overcurrent flow and an instantaneous tripping element performing the tripping operation instantaneously.
  • the opening/closing mechanism includes a toggle link mechanism having one end linked to the opening/closing contacts and another end linked to the tripping mechanism formed by latch means.
  • the opening/closing mechanism is biased by a breaking spring in such a direction that the opening/closing contacts are opened .
  • the opening/closing contacts contact.
  • closing retaining means supports the toggle link in its extended state, the contact state is maintained.
  • the contacts will be separated when the toggle link is bent by the operation of the tripping mechanism.
  • a contact pressure spring is provided for generating a contact pressure between the opening/closing contacts so that electromagnetic repulsion force that generated at the time of short-circuit current flow would not separate the opening/closing contacts.
  • the counteracting force of the contact pressure spring also has an effect on the toggle link to separate the opening/closing contacts.
  • the tripping mechanism includes latch means preventing displacement of a toggle link supporting member supporting the toggle link being biased as described above and a latch receiver preventing displacement of the latch means.
  • latch means When the operation of the overcurrent tripping device causes the operation of latch receiver, the latch means is displaced and disengaged from the toggle link supporting member and the opening/closing contacts separate.
  • the circuit breaker capable of breaking a high short-circuit current will be considered to have a high breaking performance.
  • the primary technique for improving the breaking performance of the circuit breaker is a technique for separating the opening/closing contacts as soon as possible when the short-circuit current flows. Such conventional technique is disclosed in Japanese Utility Model Laying-Open No. 63-43797.
  • the toggle link supporting member directly is disengaged from a member constituting the latch means (hereinafter referred to as a latch member), and the toggle link in its extended state is released and opening/closing contacts can be separated instantaneously without the process of a normal tripping operation by the overcurrent tripping device.
  • the sequential steps including the overcurrent tripping device operation, the latch receiver operation, displacement of the latch means, and displacement of the toggle link supporting member do not need to be performed.
  • a time lag caused by a mechanical reason is eliminated and the faster separation of opening/closing contacts can be achieved.
  • the point of this technique lies in that the latch member is supported by the spring.
  • electromagnetic repulsion force generated so as to separate the opening/closing contacts when short-circuit current flows, acts the latch member to displace via the toggle link and the toggle link supporting member.
  • the acting force strains the spring and displaces the latch member, and the latch member and the toggle link supporting member are disengaged.
  • This spring is an operation setting spring determining a predetermined value of the short-circuit current according to the above described function.
  • a secondary technique relating to the above-described technique for separating the opening/closing contacts as soon as possible is a technique that allows tackling the following problems that arise upon closing of the opening/closing contacts during the occurrence of short circuit . Even when an electromagnetic repulsion force is generated due to the flow of shortcircuit current in the circuit breaker in a closed state, the opening/closing contacts would not open because of the contact pressure spring, and the toggle link is maintained in its extended state by the closing retaining means.
  • short circuit closing operation when the short circuit is formed at the load side circuit of the circuit breaker in the open state, and the circuit breaker is closed (hereinafter this operation will be referred to as "short circuit closing operation", the opening/closing contacts contact during the extension operation of the toggle link mechanism from its bent state and a short-circuit current flows.
  • a closing force large enough to oppose the electromagnetic repulsion force in addition to the acting forces of the breaking spring and the contact pressure spring must be generated.
  • a large scale circuit or an important circuit in particular is formed by a selective breaking system in which even when a short circuit is formed in one branch, a main circuit breaker continues to supply power to another branches.
  • the main circuit breaker with such system is provided with an overcurrent tripping device constituted of a short time tripping element and not of an instantaneous tripping element to prevent the tripping operation while the short circuit current is broken by the circuit breaker of the branch where the short circuit occurs.
  • a way to solve the problem in the short circuit closing operation without the use of a large closing device is the use of an instantaneous tripping device at the time of closing (Making Current Release/MCR).
  • a circuit breaker having the MCR function is formed such that the MCR separates the opening/closing contacts instantaneously when a current equal to or higher than a predetermined threshold value flows during the short circuit closing operation and the opening/closing contacts open after the operation of the overcurrent tripping device when the current flows in the closed state.
  • the conventional technique employing the MCR is disclosed in Japanese Patent Laying-Open No. 50-5872.
  • the conventional MCR is an overcurrent tripping device utilizing an electromagnet where a movable core instantaneously attracted by a stationary core when a short-circuit current equal to or higher than a predetermined threshold value flows, wherein a block member operating in unison with an operation of the opening/closing mechanism is provided between the movable core and the stationary core.
  • the MCR is located at such a position that the block member prevents the attraction of the movable core when the circuit breaker is in a closed state, and is displaced from the position such that the blocking function does not work during the closing operation.
  • Document EP 0 789 380 A discloses a circuit breaker according to the preamble of claim 1.
  • the primary object of the present invention is to improve the short-circuit current breaking performance of the circuit breaker through the fastest possible opening of the opening/closing contacts, thereby simplifying the reset operation, to allow an automatic reset or the like.
  • Another secondary object of the present invention is to provide a small and inexpensive main circuit breaker with an MCR causing less time lag in the short circuit closing operation in a circuit with a selective breaking system.
  • a circuit breaker includes: opening/closing contacts; breaking spring biasing the opening/closing contacts in an opening a toggle link having one end disposed such that the one end cooperates with one of the opening/closing contacts; a toggle link supporting member supporting another end of the toggle link and at the same time receiving a biasing force in a direction in which the opening/closing contacts open; latch means stopping displacement of the toggle link supporting member caused by the biasing force; a latch receiver stopping displacement of the latch means biased through the stoppage of the displacement of the toggle link supporting member; and an overcurrent tripping device displacing the latch receiver to release the stoppage by the latch means.
  • the latch means includes engagement means A engaging with the latch receiver, engagement means B engaging with the toggle link supporting member, an operation setting spring biasing the engagement means and latch receiver driving means, and the engagement means are displaceable with respect to each other.
  • electromagnetic repulsion force generated between the opening/closing contacts acts on the engagement means B via the toggle link supporting member to strain the operation setting spring, the displacement of the engagement means B causes the toggle link supporting member disengaged, the opening/closing contacts separate, and the latch receiver driving means is displaced following the displacement of the engagement means B to displace the latch receiver, thus disengaging the engagement means A.
  • engagement means B displaced in this operation facilitates the return of the toggle link supporting member because latch receiver driving means displaces the latch receiver and thus engagement means A regardless of the operation of the overcurrent tripping device to eliminate the strain of the operation setting spring.
  • Such instantaneous opening operation and simplified reset operation are performed when the current exceeds the threshold value, even in case the circuit breaker is in closed state or the short circuit closing operation is performed.
  • circuit breaker in which engagement means A and engagement means B forming the latch means are levers provided on a same shaft, a circuit breaker in which the latch receiver driving means is a lever provided on the engagement means A rotating following displacement of the engagement means B and a circuit breaker in which a relay lever linking the latch receiver driving means and the engagement means B is provided on the engagement means A.
  • a circuit breaker further includes in the engagement means A, an operation control lever controlling a current of the first predetermined value and an operation control spring acting the operation control lever engaging with the engagement means B in a direction to prevent the displacement of the engagement means B displaceable in a direction to disengage the toggle link supporting member in one of above described circuit breakers including the circuit breaker according to one aspect of the present invention.
  • a circuit breaker according to still another aspect of the present invention further includes a closing operation member closing the circuit breaker by extending the toggle link from bent state; and lock means not preventing the displacement when the engagement means B is displaced in the course of the extension of the toggle link and preventing the displacement when the engagement means B is displaced after the extension, through displacement following the displacement of the closing operation member in a closing operation, in one of above described circuit breaker including the circuit breaker according to one or another aspect of the present invention.
  • the tripping operation is performed through the sequential process of: operation of the overcurrent tripping device, the displacement of the latch receiver, the displacement of engagement means B together with engagement means A, displacement of the toggle link supporting means, and the opening of the opening/closing contacts.
  • engagement means B is displaced because the lock member does not exert its locking function and is disengaged from the toggle link supporting member and the same effect as in the circuit breaker according to the first aspect described above is exhibited.
  • the lock means In the circuit breaker where the lock means is displaced by the biasing force of engagement means B and the locking function is removed when a short-circuit current equal to or higher than the second predetermined value flows in the closed state, the lock means is displaced by the force received from engagement means B and the locking function is removed when the short-circuit current equal to or higher than the second predetermined value flows in the closed state.
  • the breaking operation is not performed until the operation of the overcurrent tripping device is carried out when a current flowing in the closed state is less than the second predetermined value and the breaking operation is performed instantaneously when the current is equal to or higher than the second predetermined value.
  • a circuit breaker according to the first embodiment of the present invention shown in Figs. 1 to 11 includes a contact unit 1 with opening/closing contacts and an opening/closing mechanism unit 2 controlling opening/closing of the opening/dosing contacts.
  • contact unit 1 is disposed on an insulating molding 3 and includes power supply side and load side terminals 4, 5, power supply side and load side stationary side contact units 6, 7, a movable contact 8 separating from and contacting with both stationary side contact units 6, 7, a movable contact point 22 provided on movable contact 8, a movable contact holder 9 of an insulating member holding movable contact 8, and guide means not shown guiding movable contact holder 9 right and left.
  • contact unit 1 includes a rotatably held cross-bar 10, a contact lever 11 rotating together with cross-bar 10, a contact lever shaft 12 linking movable contact holder 9 and contact lever 11, a toggle roller 13 attached on to contact lever 11 and arc-extinguishing devices 14, 15 corresponding to the power supply side and the load side extinguishing arc generated at the breaking of the current by the circuit breaker.
  • Stationary contact unit 6 includes a stationary contact 18 on a stationary contact mould 16 rotatable about a shaft 17, a stationary contact point 21 on stationary contact 18, a contact pressure spring 23 generating a contact pressure between stationary contact point 21 and a movable contact point 22, a pair of relay contacts 19 electrically connecting stationary contact 18 and power supply side terminal 4 and a spring 20 generating a contact pressure on relay contact 19.
  • stationary side contact unit 7 is arranged symmetrically with stationary side contact unit 6 and the description thereof is not provided because the structures of the two are the same.
  • Opening/closing mechanism unit 2 includes a closing operation device and is arranged on a frame 25 as shown in Figs. 1 to 3.
  • the closing operation device is not a main portion of the present invention and the detailed description and drawing thereof will not be provided.
  • the closing operation device includes a closing spring 26 charged by charging means constituted of an electric motor and a ratchet mechanism according to the conventional art arranged between a stationary pin 67 and a pin 68 of an operation lever 27.
  • Operation lever 27 rotating back and forth in accordance with discharge and charge of closing spring 26 is rotatably provided on a shaft 28.
  • a closing operation member 29 and a closing holding latch 30 on a shaft 31 a toggle link supporting member 32 on a shaft 33, a toggle cam 34 on a shaft 35, latch means 36 on a shaft 37, a trip actuator 38 on a shaftlike latch receiver 39, a trip button 40 and a closing button 41 of the same shape on a shaft 42 in line, and an operation lever roller 43 on operation lever 27 are each provided rotatably.
  • the toggle link includes an upper toggle link 44 and a lower toggle link 46.
  • Toggle cam 34 and upper toggle link 44 are rotatably linked by a shaft 45.
  • Toggle link supporting member 32 and lower toggle link 46 are rotatably linked by a shaft 47, and upper toggle link 44 and lower toggle link 46 are rotatably linked by a link shaft 49 including a link shaft roller 48.
  • a breaking spring 51 biasing contact lever 11 to rotate anti-clockwise is attached between contact lever shaft 12 of contact unit 1 and a stationary pin 50 attached to opening/closing mechanism unit 2.
  • Latch means 36 includes engagement means A 52 and engagement means B 53 rotatably held on shaft 37 as shown in detail in Fig. 3 and Figs. 8-11.
  • engagement means A 52 a relay lever 55 bent in a U-shape and latch receiver driving means 57 are rotatably provided on a shaft 54 and a shaft 56, respectively.
  • One end of engagement means B 53 and one end of relay lever 55 are linked via a link pin 58 and another end of relay lever 55 and one end of latch receiver driving means 57 are linked via a link pin 59 such that these lever members rotate in connection with each other.
  • a roller 65 is attached to another end of latch receiver driving means 57 and disposed to face an actuator 60 provided on latch receiver 39.
  • An engagement end 55a formed in relay lever 55 is engageable with an engagement edge 61a of lock means 61 attached to closing retaining latch 30.
  • a trip roller 62 is rotatably held on another end of engagement means B 53 and an operation setting spring 63 is provided between engagement means A 52 and another end of engagement means B 53, thus relatively biasing engagement means B 53 to rotate clockwise.
  • a trip roller shaft 24 engages with an edge portion 52b of engagement means A 52 and engagement means A 52 is biased to rotate anti-clockwise together with engagement means B 53.
  • Engagement means A 52 biased to rotate in this way is prevented from rotation by an engagement edge 52a engaging with a stop portion of latch receiver 39 formed in a semicircular shape in section.
  • Upper side toggle link 44 and lower side toggle link 46 are biased to bend in a dogleg shape, which is similar to the shape of the calculation mark of "greater than (>)", by a spring force of contact pressure spring 23 or the like. They are maintained in an extended state with link shaft roller 48, which is a link portion thereof, supported by a cam edge 29a of closing operation member 29.
  • engagement edge 55a of the relay lever opposes to engagement edge 61a of the lock means.
  • closing retaining latch 30 described above is arranged coaxially with closing operation member 29 such that they can rotate independently from each other.
  • Closing retaining latch 30 is biased by a returning spring not shown to rotate anti-clockwise and prevented from rotating by stopper means not shown as it takes a position where a retaining engagement edge 30a faces with link shaft 49.
  • Fig. 1 shows the state of closing spring 26 after the discharge.
  • closing spring 26 can be automatically charged after the completion of closing operation.
  • operation lever 27 rotates clockwise
  • closing operation member 29 rotates anti-clockwise following the displacement of operation lever roller 43.
  • link shaft roller 48 moves slightly rightward along cam edge 29a
  • closing retaining latch 30 comes to engage with link shaft 49 instead of link shaft roller 48 and closing operation member 29, and maintains the extension of the toggle link.
  • Figs. 2 and 4 show the state of closing operation member 29 after the completion of its rotation.
  • latch receiver 39 rotates anti-clockwise via the action of the link member whose detailed description was not provided and trip actuator 38.
  • the rotation of latch receiver 39 causes disengagement of engagement edge 52a, and then engagement means A 52 rotates anti-clockwise together with engagement means B 53, and disengaged from trip roller 62, and toggle link supporting member 32 rotates anti-clockwise.
  • lower toggle link 46 and upper toggle link 44 are displaced lower leftward.
  • toggle cam 34 rotates clockwise, contact lever 11 rotates anti-clockwise, and movable contact point 22 separates from stationary contact point 21.
  • movable contact 8 moves further leftward due solely to the action of breaking spring 51, thus two contact points are spaced apart by a predetermined distance and the open state is established.
  • the main portion of the opening/closing mechanism in this condition is shown in Fig. 5.
  • Fig. 9 shows latch means 36, where trip roller 62 is located on cam edge 32b of the toggle link supporting member.
  • trip roller 62 is located on cam edge 32b of the toggle link supporting member.
  • toggle link supporting member 32 is rotated clockwise by a returning spring not shown and is prevented from rotation by stopper means not shown, then trip roller 62 becomes engageable with engagement edge 32a of the toggle link supporting member as shown in Fig. 6.
  • engagement means A 52 is rotated clockwise by a returning spring not shown and latch receiver 39 is also rotated clockwise by a returning spring not shown and each prevented from rotation by stopper means not shown, and then engagement end 52a of engagement means A becomes engageable with latch receiver 39 as shown in Fig. 10.
  • closing latch mechanism whose detailed description was not provided, is disengaged, closing spring 26 is discharged and operation lever 27 rotates anti-clockwise.
  • the rotation causes the clockwise rotation of closing operation member 29 via operation lever roller 43 and link shaft roller 48 moves leftward along cam surface 29a from recessed cam surface 29b of the closing operation member, stretching the toggle link.
  • toggle cam 34 rotates anti-clockwise
  • contact lever 11 rotates clockwise via toggle roller 13
  • movable contact 8 moves rightward making movable contact point 22 contact with stationary contact point 21.
  • movable contact 8 moves further slightly rightward and causes stationary contact 18 rotate anti-clockwise against the spring force of contact pressure spring 23, forming the closed state shown in Fig. 1.
  • link shaft 49 is displaced while sliding cam edge 30b and rotating closing retaining latch 30 clockwise.
  • Closing retaining latch 30 rotates back when cam edge 30b and link shaft 49 are disengaged, and is further rotated anti-clockwise by the returning spring. The rotation is stopped by stopper means at a position shown in Fig. 1 where retaining engagement edge 30a opposes to link shaft 49.
  • engagement edge 32a of toggle link supporting member 32 engages with trip roller 62 and engagement edge 52a of engagement means A engages with latch receiver 39.
  • a returning spring not shown cannot cause clockwise rotation of toggle link supporting member 32 immediately after the rotation of toggle link supporting member 32 because a large force of operation setting spring 63 in the extended state acts on a cam edge 32b via trip roller 62 even when the closing spring is in a charged state.
  • trip roller 62 is disengage from toggle link supporting member 32 and the opening/dosing contacts instantaneously separate before the rotation of latch receiver 39 caused by the operation of the overcurrent tripping device and in addition, the reset is simplified.
  • short-circuit current is lower than the first predetermined value, short-circuit current is broken when the normal closing operation is completed, forming the closed circuit and overcurrent tripping device 64 operates.
  • relay lever 55 is biased via engagement means B 53 to rotate clockwise due to the large acting force, which is a sum of contact pressure and electromagnetic repulsion force of breaking spring 51 and two contact points.
  • the large acting force which is a sum of contact pressure and electromagnetic repulsion force of breaking spring 51 and two contact points.
  • engagement end 55a engages with engagement edge 61a of the lock means and the rotation thereof is prevented.
  • the rotation of engagement means B 53 is also prevented and toggle link supporting member 32 does not rotate neither.
  • latch receiver driving means 57 nor engagement means A 52 rotate, instantaneous breaking of the short-circuit current does not occur.
  • overcurrent tripping device 64 operates, short-circuit current is broken.
  • engagement end 55a of the relay lever and engagement edge 61a of the lock means take either of the following states.
  • a first state engagement is achieved at an angle where rotation biasing force of relay lever 55 biases lock means 61 such that it rotates anti-clockwise. In this case, locking function is exhibited because lock means 61 is prevented from anti-clockwise rotation by stopper means not shown.
  • a second state engagement is achieved in an angel where lock means is biased to rotate clockwise but the biasing force applied to lock means is not large enough to realize the rotation.
  • lock means 61 can be rotated clockwise by the biasing force applied via relay lever 55 if the short-circuit current is high.
  • a short-circuit current equal to or higher than a second predetermined value which is a threshold value allowing the rotation
  • toggle link supporting member 32 rotates as in the case of short circuit closing operation and the opening/closing contact points can be made separate instantaneously to break the short-circuit current.
  • the breaking is performed after the operation of overcurrent tripping device 64, whereas when the current is equal to or higher than the second predetermined value, the breaking is performed instantaneously.
  • the second predetermined value can be changed according to the engagement angle of the engagement edge of the lock means and the engagement end of the relay lever described above as well as to the spring force of the returning spring of closing retaining latch 30 having the lock means attached thereto. Therefore, provided that the second predetermined value is a limit value below which the opening/closing contacts in the closed state do not separate by the electromagnetic repulsion force, no damage will be caused by the electromagnetic repulsion force and the selective breaking is allowed at the value not higher than the second predetermined value, and the higher short-circuit current can be broken though the selective breaking cannot be achieved at the value not less than the second predetermined value. Thus the overall range of application is widened.
  • lock means 61 is integrally arranged with closing retaining latch 30 so as to rotate in combination therewith.
  • lock means 61 and closing retaining latch 30 can be provided on the same shaft such that two operate in combination in a normal opening/closing operation and operate separately when relay lever 55 biases lock means 61 to rotate.
  • the embodiment described above includes lock means and is provided with MCR function. It is obvious, however, that short-circuit current can be broken instantaneously when a short-circuit current equal to or higher than the first predetermined value flows in either of the closed state or in the short circuit closing operation by removing lock means.
  • a current of the first predetermined value is determined mainly by operation setting spring 63. In such a structure, however, a larger operation setting spring is required to increase the current of the first predetermined value. In the circuit breaker of the second embodiment described below, the current of the first predetermined value can be increased with the addition of some components to the circuit breaker of the first embodiment.
  • a main portion of the circuit breaker of the second embodiment is shown in the closed state.
  • the circuit breaker includes, adding to the structure of first embodiment, an operation control lever 71 rotatably attached on a shaft 70 on engagement means A 52, and an operation control spring 72 provided between one arm 71a of operation control lever 71 and a pin 73 on engagement means A 52.
  • operation control lever 71 is biased anti-clockwise by operation control spring 72 and the rotation thereof is prevented by another arm 71b in contact with trip roller shaft 24 which is a central axis of trip roller 62.
  • engagement means B rotates anti-clockwise, trip roller 62 is disengaged from toggle link supporting member 32 and the circuit is opened without the operation of the overcurrent tripping device.
  • trip roller shaft 24 engages with a control engagement edge 71c formed on another arm of operation control lever 71 and makes operation control lever 71 rotate clockwise against operation control spring 72.
  • the circuit breaker of the second embodiment will not come to the open state when a biasing force applied on control engagement edge 71c of the operation control lever from trip roller shaft 24 is smaller than the acting force of operation control spring 72. Therefore, with the addition of operation control lever 71 and operation control spring 72, the current of the first predetermined value can substantially be increased.
  • the current of the first predetermined value can substantially be increased even if the acting force of operation control spring 72 is small.
  • trip roller 62 is on engagement edge 32b and operation control lever 71 is in a state where anti-clockwise rotation is prevented with corner upper edge 71d of operation control lever 71 being in contact with trip roller shaft 24 after the disengagement from engagement edge 32a of the toggle link supporting member as shown in Fig. 14.
  • engagement edge 52a of engagement means is disengaged from latch receiver 39
  • engagement means 52 rotates anti-clockwise and trip roller 62 returns onto engagement edge 32a of the toggle link supporting member
  • operation control lever 71 rotate anti-clockwise following the movement of trip roller shaft 24 and trip roller shaft 24 and another arm 71b of the operation control lever engage again.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Claims (8)

  1. Disjoncteur comprenant :
    des contacts ouvrant/fermant (8,18) ;
    une barrette à bascule (44, 46) possédant une extrémité disposée de manière à ce que ladite extrémité collabore avec l'un desdits contacts ouvrant/fermant (8) ;
    un élément de support de barrette à bascule (32) soutenant une autre extrémité de ladite barrette à bascule et recevant en même temps une force d'appui dans une direction dans laquelle lesdits contacts ouvrant/fermant s'ouvrent aux moyens d'un ressort de rupture (51) ;
    des moyens de verrouillage (36) arrêtant le déplacement de l'élément de support de la barrette à bascule entraíné par la force d'appui ;
    un berceau de verrouillage (39) arrêtant le déplacement desdits moyens de verrouillage actionné par l'arrêt du déplacement dudit élément de support de la barrette à bascule ; et
    un dispositif de déclenchement à surintensité (64) déplaçant ledit berceau de verrouillage pour libérer l'arrêt par lesdits moyens de verrouillage ; dans lequel
    lesdits moyens de verrouillage comprennent des moyens d'enclenchement A (52) enclenchés sur ledit berceau de verrouillage, des moyens d'enclenchement B (53) enclenchés sur ledit élément de support de la barrettes à bascule, un ressort d'armement de fonctionnement (63) appuyant sur lesdits moyens d'enclenchement, caractérisé en ce que lesdits moyens d'enclenchement comprennent également des moyens moteurs de berceau de verrouillage (57), en ce que lesdits moyens d'enclenchement sont mobiles les uns par rapport aux autres et en ce que, en utilisation, lorsqu'une intensité de court-circuit égale ou supérieure à une première valeur prédéterminée passe par ledit disjoncteur, une force de répulsion électromagnétique est créée entre lesdits contacts ouvrant/fermant sur lesdits moyens d'enclenchement par ledit élément de support de la barrette à bascule pour tendre ledit ressort d'armement de fonctionnement, le déplacement desdits moyens d'enclenchement B entraíne la libération dudit élément de support de la barrette à bascule, lesdits contacts ouvrant/fermant se séparent et lesdits moyens moteurs de berceau de verrouillage sont déplacés en suivant le déplacement desdits moyens d'enclenchement B pour déplacer ledit berceau de verrouillage, libérant ainsi lesdits moyens d'enclenchement A.
  2. Disjoncteur selon la revendication 1 dans lequel les moyens d'enclenchement A et les moyens d'enclenchement B formant lesdits moyens de verrouillage sont des leviers montés sur le même arbre (37).
  3. Disjoncteur selon l'une quelconque des revendications 1 ou 2, dans lequel les dits moyens moteurs de berceau de verrouillage sont constitués par un levier monté rotatif sur lesdits moyens d'enclenchement A suivant le mouvement desdits moyens d'enclenchement B.
  4. Disjoncteur selon l'une quelconque des revendications 1 à 3, dans lequel un levier de relais (55) reliant lesdits moyens moteurs de berceau de verrouillage et lesdits moyens d'enclenchement B est prévu sur lesdits moyens d'enclenchement A.
  5. Disjoncteur selon l'une quelconque des revendications 1 à 4 dans lequel lesdits moyens d'enclenchement A sont pourvus d'un levier de commande de fonctionnement (71) contrôlant une intensité de ladite première valeur prédéterminée et un ressort de commande de fonctionnement (72) agissant sur ledit levier enclenché sur lesdits moyens d'enclenchement B dans une direction pour empêcher le déplacement desdits moyens d'enclenchement B mobiles dans une direction pour libérer ledit élément de support de barrette à bascule.
  6. Disjoncteur selon l'une quelconque des revendications 1 à 5 comprenant en outre :
    un élément de fonctionnement de fermeture (29) fermant ledit disjoncteur en redressant ladite barrette à bascule de sa position courbée et
    des moyens de verrouillage (61) n'empêchant pas le déplacement lorsque lesdits moyens d'enclenchement B sont déplacés lors du redressement de ladite barrette à bascule et empêchant le déplacement lorsque lesdits moyens d'enclenchement B sont déplacés après le redressement, grâce au déplacement consécutif du déplacement dudit élément de fonctionnement de fermeture dans l'opération de fermeture.
  7. Disjoncteur selon la revendication 6 dans lequel ledit levier de relais est pourvu d'une extrémité d'enclenchement (55a) s'enclenchant sur lesdits moyens de verrouillage.
  8. Disjoncteur selon l'une quelconque des revendications 6 ou 7 dans lequel lesdits moyens de verrouillage sont déplacés par une force d'appui desdits moyens d'enclenchement B pour libérer lesdits moyens de verrouillage lorsqu'une intensité de court-circuit égale ou supérieure à une seconde valeur prédéterminée passe dans une position fermée.
EP19990124033 1998-12-24 1999-12-09 Disjoncteur Expired - Lifetime EP1014415B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP36684898 1998-12-24
JP36684898 1998-12-24
JP29797899 1999-10-20
JP29797899A JP3368238B2 (ja) 1998-12-24 1999-10-20 回路遮断器

Publications (2)

Publication Number Publication Date
EP1014415A1 EP1014415A1 (fr) 2000-06-28
EP1014415B1 true EP1014415B1 (fr) 2002-03-27

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JP (1) JP3368238B2 (fr)
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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018216210A1 (de) 2018-09-24 2020-03-26 Siemens Aktiengesellschaft Schnell auslösende Verklinkung, Auslösemechanismus und Schnellerder, Schnellschalter oder Kurzschließer
CN117577491B (zh) * 2024-01-16 2024-03-29 浙江厚达电气有限公司 一种分合闸设备的锁定机构

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE605080C (de) * 1930-03-11 1934-11-03 Reyrolle & Co Ltd A Elektrischer Selbstschalter
FR1393064A (fr) * 1963-05-16 1965-03-19 Licentia Gmbh Disjoncteur où l'ouverture du système des contacts limite l'intensité du courant
US3534305A (en) * 1968-11-21 1970-10-13 Ite Imperial Corp Current limiting circuit breaker
JPS5341785B2 (fr) * 1973-05-21 1978-11-07
JPS61224227A (ja) * 1985-03-28 1986-10-04 三菱電機株式会社 気中しや断器
FR2744563B1 (fr) * 1996-02-06 1998-04-03 Schneider Electric Sa Mecanisme de commande d'un disjoncteur a verrou debrayable sur un court-circuit

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Publication number Publication date
DE69901091D1 (de) 2002-05-02
JP2000243204A (ja) 2000-09-08
EP1014415A1 (fr) 2000-06-28
JP3368238B2 (ja) 2003-01-20
DE69901091T2 (de) 2002-10-02

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