EP0066486B1 - Mécanisme de manoeuvre d'un disjoncteur électrique multipolaire à basse tension - Google Patents

Mécanisme de manoeuvre d'un disjoncteur électrique multipolaire à basse tension Download PDF

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Publication number
EP0066486B1
EP0066486B1 EP82400831A EP82400831A EP0066486B1 EP 0066486 B1 EP0066486 B1 EP 0066486B1 EP 82400831 A EP82400831 A EP 82400831A EP 82400831 A EP82400831 A EP 82400831A EP 0066486 B1 EP0066486 B1 EP 0066486B1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
lever
breaker according
pole circuit
pole
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
Application number
EP82400831A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0066486A1 (fr
Inventor
Bernard Boichot-Castagne
Roger Case
Reynald Marin-Pache
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
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 Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0066486A1 publication Critical patent/EP0066486A1/fr
Application granted granted Critical
Publication of EP0066486B1 publication Critical patent/EP0066486B1/fr
Expired 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
    • H01H71/50—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
    • H01H71/1054—Means for avoiding unauthorised release
    • 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
    • H01H2071/508—Latching devices between operating and release mechanism with serial latches, e.g. primary latch latched by secondary latch for requiring a smaller trip force

Definitions

  • the pivoting cradle directly drives the trigger hook during the rearming phase, which requires a large sliding stroke generating friction forces between the two mechanical members.
  • the cradle and the trigger hook must undergo appropriate surface treatments which increase the manufacturing cost of the assembly.
  • the object of the invention is to remedy these drawbacks and to allow the production of an operating mechanism with reduced friction which does not require additional surface treatments.
  • the mechanism according to the invention is characterized in that the upper link of the toggle joint is articulated to the trigger hook and is extended by a transmission lever cooperating with the cradle to cause the reset of the trigger hook in the armed position for attachment to the latch when moving the lever from the intermediate position to the reset position close to the open position.
  • the rearming of the mechanism via the upper link of the toggle joint generates a small sliding stroke of the transmission lever on the cradle, and the corresponding friction is negligible.
  • the free end of the transmission lever of the upper link is shaped as a control tab bearing on a sliding surface of the cradle between the intermediate and open positions of the lever.
  • the leg of the transmission lever is bent at right angles, extending transversely outwards from the gap formed between the support plates of the operating mechanism.
  • the upper link has a V-shaped bent structure, comprising a first lever arranged between the pivot axis of the toggle joint and the articulation axis of the trigger hook, and making a predetermined angle with the second transmission lever cooperating with the cradle.
  • the pivoting cradle is provided with a projection intended to come into abutment with the link tab to stop in a position of the lever any attempt to open the circuit breaker manually in the event of contact soldering, said tab automatically disappearing in front of the protrusion when the knee brace is broken and the contacts open normally.
  • the dual function of the control link of the upper link which is used alternately to drive the trigger hook to the armed position and the blocking stop of the lever cradle when the contacts are in the welded position.
  • the lock unlocking member advantageously comprises a half-moon mounted with limited rotation on an axis, and the bore of which comprises a radial extension intended to engage in a conjugate groove of the axis.
  • a torsion spring positions the half-moon relative to the lock, preventing any untimely triggering.
  • the bar coupled to the lower link of the toggle joint is guided in rotation by intermediate coaxial bearings bearing on the housing.
  • each contact arm being biased against a bearing face of the bar by means of a compression spring
  • the setting of the depression of each contact arm is effected by means of 'an adjustment shim of predetermined thickness, inserted in a groove of the bar to modify the angular position of said bearing face, the positioning of the shim being effected after separation of the contact arm at the against the force of the compression spring.
  • a cut-off block 10 of a low-voltage multipole circuit breaker is housed in a box 12 made of molded insulating material constituted by the assembly of an intermediate casing 14 with open bottoms, a cover 16 d ' obturation of the upper bottom and of a base 18 for closing the lower bottom.
  • the casing 14 comprises a central partition 20 parallel to the bottoms and dividing the internal space of the housing 12 into two upper 22 and lower 24 compartments isolated from one another.
  • the cover 16, the casing 14 and the base 18 are fixed to each other by assembly means (not shown).
  • the cover 16 has an opening 25 for the passage of an operating lever 26 associated with the control mechanism 28 arranged in the upper compartment 22.
  • the poles have identical structures and are juxtaposed transversely in the lower compartment 24 according to planes parallel to that of FIG. 1.
  • the control mechanism 28 is associated with an intermediate pole and transmits the movement to the adjacent poles by means of a common transverse bar 30, made of insulating material.
  • Each pole comprises an arm 32 of movable contact 34 cooperating in the closed position with a fixed contact 36 secured to a conductor 38 in the form of a loop in electrical connection with a terminal 40 for connection of the cut-off block 10.
  • fixed 36 and mobile 34 is associated with an arc extinguishing chamber 42 with metal sheets of deionization, arranged in the lower compartment 24 between the conductor 38 and the base 18.
  • the transmission rod 30 is pivotally mounted in the lower compartment 24 and extends perpendicularly to the different contact arms 32 by driving them simultaneously when the control mechanism 28 is actuated manually controlled by the lever 26 and automatically by a block interchangeable magneto-thermal release (not shown).
  • the latter is positioned in a transverse housing 44 of the housing 12, and is electrically connected to the poles of the breaking unit 10 by connection screws (not shown).
  • a compression spring 46 interposed between the bar 30 and the contact arm 32 of each pole, ensures an appropriate contact pressure in the closed position of the circuit breaker.
  • the operating lever 26 is capable of occupying three stable angular positions, namely an extreme position F for closing, an intermediate position D for tripping on a fault detected by the trip unit, and an extreme opposite position 0 for manual opening of the circuit breaker .
  • the control mechanism 28 (FIGS. 1 to 3) is mounted between two fixed and parallel plates 48, 50, and includes a transmission toggle link 52 with an intermediate axis 54 on which two pairs of rods 56, 58 are articulated, symmetrical with respect to the median plane of the mechanism 28.
  • the lower link 56 of each pair is mechanically coupled to the transverse bar 30 by a connecting pin 60.
  • Each upper link 58 has a V-shaped structure and is articulated by a rivet or axis 62 to a lateral branch 63 of a trigger hook 64 extending in the interval between the plates 48, 50.
  • the mechanism 38 comprises two traction springs 66 hung between the axis 54 of the toggle joint 52 and a cradle 68 supporting the lever 26,
  • the cradle 68 is pivotally mounted between the positions O and F of the lever 26 on a transverse pivot 70 projecting from the plates 48, 50.
  • the pivot 70 serves as a stop for the hook of trigger 64 when it comes to the disarmed position (FIG. 1), corresponding to position D of the lever 26.
  • the pivoting cradle 68 of the lever 26 is provided with a reset rod 72 of the trigger block (not shown) equipped with an energy accumulator device with striker.
  • the trigger hook 64 is mounted with limited rotation between the armed and disarmed positions on a fixed axis 74 secured to each plate 48, 50.
  • a hooking spout 76 which engages with a lock 78 during the pivoting of the hook 64 towards the armed position.
  • the lock 78 is pivotally mounted on a fixed axis 80 carried by the plates 48, 50, and a return spring 84 threaded on the axis 80 biases the lock 78 in support of a stop 82, formed by a rod parallel to axis 80.
  • a control member for the lock 78 comprises a half-moon 86 made of plastic material, mounted between the plates 48.50 for rotation on an axis 88 extending parallel to the transverse axis 80 of the lock 78.
  • the half-moon 86 balanced with respect to its axis 88, is provided with a central extension or boss 90 arranged inside the bore 92 of the half-moon 86, and intended to engage in a groove 94 conjugate with the axis 88 ( Figures 3 and 8).
  • the latter is positioned in aligned orifices of the plates 48, 50, and is held in place by the half-moon 86.
  • the captive mounting of the pin 88 does not require any means of immobilization in translation, such as circlips.
  • the central boss 90 comes directly from molding.
  • the half-moon 86 is provided with an unlocking tab 96 cooperating with the striker of the trigger block to cause the triggering of the mechanism 28 in the event of a fault.
  • the triggering results from a pivoting of the half-moon 86 in the trigonometric direction indicated by the arrow F i (fig. 2) followed by the introduction of the locking nose 98 into the window 100 of the lock 78.
  • the latter does not is no longer locked by the half-moon 86, and the torque exerted by the trigger hook 64 in the armed position causes the lock 78 to tilt clockwise (arrow F 2 ) towards the unlocked position.
  • the hooking spout 76 is then released from the latch 78, and the cro trip device 64 automatically pivots around the axis 74 towards the disarmed position under the action of the springs 66 of the mechanism 28.
  • an elastic means positions the half-moon 86 relative to the latch 78 so to provide a predetermined clearance d (fig. 1) between a projection 102 of the half-moon 86 and the plate 48.
  • the presence of the clearance d prevents any transmission of shocks from the plate 48 to the half-moon 86.
  • the elastic means for positioning the half-moon 86 is produced by a torsion spring 104, one strand 106 of which rests on two bosses 108 of the half-moon 86 (fig. 9).
  • the spring 104 is threaded on the rod 82 of the stop of the latch 78, and the other strand 109 of the spring 104 is in contact with a curved tab of the fixed plate 48. Note the dual function of the torsion spring 104 which serves as a means of returning the half-moon 86 to the locking position of the lock 78 and as a means of elastic positioning of the half-moon 86 relative to the plate 48 and to the lock 78.
  • Each upper link 58 in V of the toggle joint 52 comprises a first lever 110 delimited by the axis 54 of pivoting of the toggle joint and the axis 62 of articulation of the trigger hook 64.
  • a second lever 112 extends from the axis 62 towards the cradle 68 at an acute angle with the first lever 110.
  • the free end of the second lever 112 is shaped as a transmission lug 114 folded at right angles and cooperating with the pivoting cradle 68, so as to drive the trigger hook 64 to the armed position for hooking the spout 76 to the latch 78.
  • This reset operation of the mechanism 28 occurs during the clockwise movement of the lever 26 from the trigger position D to the reset position R.
  • the curved tab 114 of each link 58 extends transversely towards the outside of the gap formed between the plates 48, 50, and is supported between the positions D and R of the lever 26 on a front surface 116 of slightly curved sliding from cradle 68.
  • the pivoting cradle 68 further includes a projection 118 disposed between the curved portion 116 and the handle 26 and intended to come into abutment with the tab 114 of each upper link 58 to stop in position S of the handle 26 any attempt to open manually of the circuit breaker in the event of accidental soldering of the contacts (fig. 6).
  • the tab 114 does not interfere with the trajectory of the projection 118 of the cradle 68.
  • the transverse bar 30 for supporting the movable contact arms 32 of the different poles is coupled to the lower links 56 of the mechanism 28 and is positioned by two pads 120, 122 coaxial or intermediate anti-wear bearings, separated transversely from each other by the width of the central pole.
  • the pads 120, 122 made of plastic material bear on the housings of the casing 14 and of the socket 18 at the level of the internal partition walls of the pole compartments.
  • the rotational mounting of the bar 30 does not require any special guide axis, nor end bearings in the opposite side walls of the housing 12.
  • the assembly of each intermediate pad 120, 122 around the bar 30 is effected by snap-fastening of the free ends of a semi-open ring with axial slit or of two half-rings 124, 125 of conjugate shapes.
  • the driving in of the movable contact arms 32 of different poles is dependent on the imperfections in the molding of the plastic material parts and the manufacturing tolerances of the members of the mechanism 28.
  • the setting of the driving in by pole takes place by means of a shim 126 ( FIGS. 1, 12 and 13) of adjusting the relative position of the movable contact 34 relative to the associated fixed contact 36.
  • Each wedge 126 is made of plastic material and is inserted in a groove of the bar 30 so as to slightly modify the angular position of the bearing face of the contact arm 32.
  • the positioning of each wedge 126 on the bar 30 s' operates after manual separation of the contact arm 32 corresponding against the force of the compression spring 46. Adjustment shims 126 having different thicknesses can be used to best compensate for manufacturing tolerances.
  • the mechanism 28 is rearmed by manual movement of the lever 26 clockwise from position D to a reset position R close to position O.
  • the transmission lever 112 of each upper link 58 of the toggle joint 52 is driven upwards by reaction of the surface 116 of the cradle 68 on the tab 114 at right angles.
  • the latter moves on the surface 116 in a sliding movement of small amplitude whose corresponding reaction forces do not generate significant friction. This results in a tilting around the axis 74 of the trigger hook 64 urged in a clockwise direction towards the armed position (fig. 5), in which the hooking spout 76 hangs on the latch 78 in support of the stop 82.
  • the half-moon 86 maintains the lock 78 in this position, and the tab 114 of each link 58 remains in stable support on the surface 116 of the cradle 68.
  • the rod rearming auxiliary 72 integral with the cradle 68 causes the rearming of the energy storage device associated with the trip unit.
  • the closing of the circuit breaker occurs in a conventional manner by a reverse rotation of the handle 26 towards the opposite position F (fig. 7), urging the axes 62, 54, 60 of the toggle joint 52 substantially aligned position.
  • the clockwise pivoting movement of the tab 114 of the upper links 58 does not interfere with the trajectory in the opposite direction of the projection 118 of the cradle 68 actuated towards the position F of the lever 26.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Breakers (AREA)
EP82400831A 1981-05-18 1982-05-05 Mécanisme de manoeuvre d'un disjoncteur électrique multipolaire à basse tension Expired EP0066486B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8110000A FR2506066A1 (fr) 1981-05-18 1981-05-18 Mecanisme de manoeuvre d'un disjoncteur electrique multipolaire a basse tension
FR8110000 1981-05-18

Publications (2)

Publication Number Publication Date
EP0066486A1 EP0066486A1 (fr) 1982-12-08
EP0066486B1 true EP0066486B1 (fr) 1985-04-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400831A Expired EP0066486B1 (fr) 1981-05-18 1982-05-05 Mécanisme de manoeuvre d'un disjoncteur électrique multipolaire à basse tension

Country Status (6)

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US (1) US4401872A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0066486B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS57194431A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1218399A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE3262950D1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2506066A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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FR2360171A1 (fr) * 1976-07-30 1978-02-24 Unelec Mecanisme de commande de disjoncteur
FR2361737A1 (fr) * 1976-08-09 1978-03-10 Unelec Disjoncteur avec dispositif de verrouillage de la poignee de commande en cas de soudure des contacts
JPS5942935B2 (ja) * 1978-07-05 1984-10-18 富士電機株式会社 回路しゃ断器

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Also Published As

Publication number Publication date
DE3262950D1 (en) 1985-05-15
FR2506066A1 (fr) 1982-11-19
US4401872A (en) 1983-08-30
JPS6253900B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1987-11-12
JPS57194431A (en) 1982-11-30
EP0066486A1 (fr) 1982-12-08
FR2506066B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1983-07-29
CA1218399A (en) 1987-02-24

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