EP0224396B1 - Mécanisme de commande pour disjoncteur électrique à basse tension - Google Patents

Mécanisme de commande pour disjoncteur électrique à basse tension Download PDF

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Publication number
EP0224396B1
EP0224396B1 EP86402267A EP86402267A EP0224396B1 EP 0224396 B1 EP0224396 B1 EP 0224396B1 EP 86402267 A EP86402267 A EP 86402267A EP 86402267 A EP86402267 A EP 86402267A EP 0224396 B1 EP0224396 B1 EP 0224396B1
Authority
EP
European Patent Office
Prior art keywords
lever
plate
circuit breaker
arm
trip
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
EP86402267A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0224396A1 (fr
Inventor
Michel Lazareth
William Bartolo
Patrick Rousset
Gérard Hervouet
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
Priority to AT86402267T priority Critical patent/ATE64234T1/de
Publication of EP0224396A1 publication Critical patent/EP0224396A1/fr
Application granted granted Critical
Publication of EP0224396B1 publication Critical patent/EP0224396B1/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
    • H01H71/50—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/046—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H using snap closing mechanisms
    • H01H2300/048—Snap closing by latched movable contact, wherein the movable contact is held in a minimal distance from the fixed contact during first phase of closing sequence in which a closing spring is charged

Definitions

  • This type of mechanism allows manual control by pivoting of the operating handle and automatic control by triggered piloting by means of a thermal and / or electromagnetic trigger causing in the event of overloads the break in the kinematic chain between the lever and the contact arm.
  • the mechanical members of known mechanisms are generally mounted on articulations formed for example, by needles individually housed in housings, either in the insulating housing, or in a pair of fixed support plates.
  • the assembly of such a mechanism is complicated and requires precise positioning of the actuating members which lengthens the assembly time of the circuit breaker.
  • the axes of the mechanism members are mounted on a fixed plate, but the release effort exerted by the trigger lever to break the mechanical connection is relatively large and increases the trigger time .
  • the contact arm is provided with an L-shaped end urged by a compression spring bearing against a recess of a drive lever.
  • This arrangement of the contact arm does not facilitate total automation of the mounting of the mechanism.
  • the object of the present invention is to provide a simple and reliable construction control mechanism, adapted on the one hand to automate assembly, and on the other hand to reduce the tripping time of a miniature circuit breaker.
  • the control mechanism according to the invention is characterized in that the contact arm is secured to an insulating support lever articulated on the pivot of the plate, and that the trigger lever is pivotally mounted on an axis fixed to the plate, which further comprises bidirectional drive means of the support lever between the open and closed positions, the assembly being arranged to ensure in the closed position a relatively small pivoting movement between the plate and the support lever, thanks to a first contact pressure spring belonging to said elastic system.
  • the axis of articulation of the trigger lever and the pivot come directly from molding with the plate, which avoids the use of special needles.
  • the mechanism is advantageously provided with an auxiliary device for abrupt closure of the contacts, thanks to a locking arm arranged on the insulating support lever of the contact arm.
  • the locking arm cooperates with a pawl pivotally mounted on the axis of the lever.
  • the hooking stop of the plate is formed by a notch having a release ramp intended to push the end of the link towards a cleared position of disengaging, when the trigger lever is in the triggered position.
  • the elastic system comprises a spring, arranged to exert on the plate a torque generating the unlocking action of the ramp on the link to break the mechanical connection. The triggering force from the trigger is minimal and must simply overcome the opposing effort of the return spring of the trigger lever.
  • the trigger lever is advantageously equipped with a step for holding the end of the link against the hooking stop when the mechanical connection is established.
  • the presence of the plate constitutes both a kinematic member for transmitting the rod coupled to the lever, and a combined member for supporting the contact arm and the trigger lever.
  • the support lever and the trigger lever extend parallel to each other with a transverse offset from the vertical plane passing through the plate.
  • the first arm of the trip lever protrudes from the insulating support lever towards the electromagnetic trip device, when the circuit breaker is in the closed position, the assembly being arranged so that the striker of the electromagnetic trip device successively drives the trip lever towards the position triggered, and the support lever towards the contact separation position, when the pole current exceeds the triggering threshold of said electromagnetic trip device.
  • the control mechanism may include a mechanical indicator of the position of the contacts.
  • Said indicator comprises positioning marks arranged on the upper edge of the plate, moving opposite the internal wall of the front face of the housing, which includes a window for viewing the marks.
  • the mechanism 10 for controlling a miniature circuit breaker actuates a movable contact arm 12, one of the ends of which carries a contact piece 14 cooperating with a fixed contact 16.
  • the mechanism 10 is housed at inside an insulating housing 18, above the arc extinguishing chamber (not shown).
  • An opening 20 is formed in the front face 21 of the housing 18 for the passage of a tilting handle 22 for manual control, said handle being mounted with limited pivoting on a fixed axis 24 between a closed position (fig. 1) in which the contacts 14, 16 are closed, and an open position (FIG. 6) corresponding to the separation of the contacts 14, 16.
  • the handle 22 has an internal extension, coupled to a transmission link 26 to constitute a toggle device 28, the articulation 30 of which is eccentric with respect to the fixed axis 24 of the lever 22.
  • the portion of the extension situated between the axis 24 and the articulation 30 forms the other link 32 of the toggle joint 28.
  • the transmission link 26 comprises a U-shaped bracket, in particular made of steel wire.
  • the lever 22 is urged towards the open position by a return spring 34, in particular of the spiral type threaded on the axis 24 and one of the ends 35 of which bears on a boss 36 of the housing 18.
  • the fixed contact 16 is carried by a conductor 17 fixed to the frame of the electromagnetic trip device 66.
  • the free end 37 of the transmission link 26 cooperates by snap-fastening with a hooking stop 38 arranged on a plate 40.
  • the latter is pivotally mounted on a cylindrical pivot 42, positioned transversely in aligned bearings 44, arranged in the opposite faces of the housing 18.
  • the plate 40 has an axis 46 eccentric with respect to the pivot 42, and the trigger lever 48 is pivotally mounted on the axis 46 between an armed position and a triggered position.
  • the contact arm 12 of conductive material in particular copper, is fixed to a support lever 50 of insulating material, articulated on the pivot 42 of the plate 40 opposite the trigger lever 48.
  • the plate 40 is equipped with a cleat 52 for driving the support lever 50 between the open and closed positions of the contact arm 12.
  • the contact arm 12 is fixed to the insulating support lever 50 can be carried out by ultrasonic welding.
  • a contact pressure spring 54 of the torsion type, coaxially surrounds the pivot 42 by bearing on a boss 55 of the support lever 50, and a lug 56 of the plate 40.
  • a spring 58 energy accumulator, of the type compression is arranged between a fixed stop 60 of the housing 18 and the tilting plate 40, and biases the latter towards the open position, when the mechanism 10 is triggered.
  • the presence of the spring 54 allows a relative movement of small amplitude between the plate 40 and the support lever 50.
  • the trigger lever 48 pivoting on the axis 46 comprises a lower lever arm 62 which can be actuated, either by the striker 64 of an electromagnetic trip device 66, or by a release slide 68 cooperating with the bimetallic strip 70 of the thermal trip device.
  • the drawer 68 is guided in translation by means of a guide passage 71 formed in the housing 18.
  • the upper lever arm 72 of the trigger lever 48 is equipped with a step 74 cooperating with the free end 37 of the link transmission 26.
  • a return spring 76 of the spiral type is threaded around the axis 46 and biases the trigger lever 48 towards the armed position.
  • the hooking stop 38 of the plate 40 is formed by a notch 82 having a release ramp from the end 37 of the rod 26 to an unlocked position when the trigger lever 48 is pivoted towards the triggered position.
  • the force of the mechanism opening spring 58 is greater than that of the lever return spring 34.
  • the striker 64 of the electromagnetic trip device 66 comprises a release button 65 made of insulating material, having one end force-fitted into a central bore 86 of the movable core 88, and an opposite end, provided with a cylindrical endpiece 90 extending in the middle zone of the housing 18.
  • the end piece 90 is located opposite the trigger lever 48 and the support lever 50, the latter being offset transversely from one another, so as to be successively driven by the end piece 90, during the magnetic attraction of the movable core 88 of the electromagnetic trip device 66.
  • the lower lever arm 62 projects from the support lever 50 in the direction of the trip device 66.
  • the propulsion of the tip 90 of the striker 64 causes in a first phase the pivoting in the trigonometric direction of the trigger lever 48 towards the position d triggered, followed in a second phase of the driving of the support lever 50 of the contact arm 12 towards the open position of the contacts 16, 14.
  • the position of the stop 38 for hooking onto the plate 40 is located opposite the intervention zone of the trigger on the lever arm 62 with respect to a transverse plane passing through the pivot 42 and the axis 46.
  • the active part of the lower lever arm 62, disposed opposite the end piece 90 is slightly convex so that the tripping force exerted by the striker 64 remains substantially constant during pivoting of the trigger lever 48 about the axis 46.
  • circuit breaker control mechanism 10 The operation of the circuit breaker control mechanism 10 is as follows:
  • the kinematic chain of connection of the lever 22 to the contact arm 12 is never interrupted by virtue of the permanent snap-fastening of the link 26 in the hooking stop 38 of the plate 40.
  • the displacement of the lever 22 is transmitted to the contact arm 12 by means of the link 26, of the plate 40 and of the insulating support lever 50.
  • the manual closure is controlled by pivoting the handle 22 in a clockwise direction towards the position F shown in FIG. 1.
  • the position F of the handle 22 is stable thanks to the exceeding of the neutral point of the toggle joint 28, the return force of the spring 34 acting on the handle 22 being insufficient to overcome the locking force of the toggle joint 28.
  • the manual opening of the circuit breaker results from a movement in the opposite direction of the handle 22 towards the position O (FIG. 6) causing the toggle joint 28 to break, and the pivoting anticlockwise of the plate 40 and the support lever 50 around the pivot 42.
  • the tripping of the circuit breaker is caused by the bimetallic strip 70 of the thermal trip unit or by the striker 64 of the electromagnetic trip unit 66 causing the trip lever 48 to rotate in the trigonometric direction of the armed position (figure 1) to the unlocked position (figure 5).
  • the upper lever arm 72 moves away from the end 37 of the link 26 and causes the locking force to disappear.
  • the couple exerted by the spring 58 in the opening direction requests a slight pivoting of the plate 40 in the trigonometric direction, so as to push the end 37 of the rod 26 downwards, after erasing the step 74 of the trigger lever 48
  • the connecting rod 26 is disengaged with the stop 38 for hooking the plate 40, and the interruption of the mechanical connection between the lever 22 and the contact arm 12.
  • the relaxation of the accumulator spring 58 then causes the contact arm 12 and the plate 40 to pivot freely towards the open position shown in FIG. 6.
  • the action of the return spring 34 of the handle 22 breaks the toggle switch 28 by bringing the handle 22 back to the open position O.
  • the automatic resetting of the mechanism 10 takes place in this position by snap-fastening of the end 37 of the link 26 with the stop 38 for hooking the plate 40.
  • the step 74 of the lever arm 72 locks the link 26, so to reestablish the mechanical connection between the handle 22 and the support lever 50 of the contact arm 12.
  • the mechanism 10 is then ready for a new closure by manual drive of the handle 22 from the position O (FIG. 6) to the position F ( figure 1).
  • the upper edge of the plate 40 can be equipped with markers indicating the open or closed positions of the contact arm 12.
  • the markers are visible from the outside through a window (not shown) formed in the front face 21, and constitute a mechanical indicator allowing an indirect visualization of the separation of the contacts 14, 16, by means of the tilting plate 40. This display is reliable since the contact arm 12 is integral with the support lever 50 driven by the plate 40.
  • the plate 40 serves both as a transmission member for the link 26 and as a combined support member for the contact arm 12 and the trigger lever 48.
  • the pivot 42 and the axis 46 come directly molding with the plate 40, which avoids the use of special metal needles.
  • the plate 40 is produced by molding a metallic or plastic material. A system of fixed stops limits the opening stroke of the mechanism 10.
  • the pivot 42 constitutes a common pivot axis of the plate 40 and the support lever 50, so as to obtain a reduced bulk of the mechanism 10.
  • Transmission of the trigger order multipole is operated by a drive lug (not shown), secured to the trip lever 48 at the axis 46.
  • a fault in one phase leads to simultaneous tripping of the adjacent poles of a multipole circuit breaker.
  • the mechanism 10 is in fact composed of two separate sub-assemblies which can be pre-assembled outside the housing 18 and set up automatically during the mounting of the circuit breaker.
  • the first sub-assembly comprises the plate 40 on which the insulating support lever 50 fitted on the pivot 42 is mounted, and the trigger lever 48 articulated on the axis 46.
  • the contact arm 12 is connected to the bimetallic strip 70 by a conductive braid 94.
  • the first contact pressure spring 54 surrounding the pivot 42 bears on the boss 55 of the support lever 50 and the lug 56 of the plate 40.
  • the second return spring 76 of the trigger lever 48 is then placed around the axis 46.
  • the installation of the first sub-assembly takes place by simple positioning of the pivot 42 in a bearing 44 of the housing 18, followed by the insertion of the compression spring 58.
  • the second sub-assembly includes the handle 22, its return spring 34 and the transmission link 26.
  • the torsion spring 34 is integrated in the handle 22, and the strand 35 is taken in load by the boss 36 of the housing 18 during the establishment of the second sub-assembly.
  • the free end 37 of the rod 26 is then positioned in the notch 82 of the hooking stop 38 to make the mechanical connection between the lever 22 and the contact arm 12.
  • the mechanism 10 for controlling the circuit breaker is equipped with an auxiliary closing device abrupt, designated by the general reference 100, and comprising a retaining pawl 102 cooperating with a ramp 104 extending along an arm 106 for temporary locking of the insulating support lever 50.
  • the pawl 102 pivotally mounted on the axis 24 of the handle 22, is associated with a return spring 108 which biases the pawl 102 in the counterclockwise direction against a stop 110 of the handle 22.
  • the locking arm 106 is arranged between the transmission link 26 and the electromagnetic trip device 66.
  • the operation of the auxiliary abrupt closing device 100 is as follows:
  • the circuit breaker is closed by tilting the handle 22 from the left (figure 7) to the right (figure 9).
  • the kinematic chain connecting the lever 22 to the plate 40 drives the contact arm 12 to the fixed contact 16.
  • the pawl 102 rotates with the lever 22 clockwise , and approaches the arm 106 for locking the support lever 50, which rotates in the opposite direction.
  • the engagement of the pawl 102 with the ramp 104 of the locking arm 106 stops the rotation of the support lever 50, and maintains the contact piece 14 of the contact arm 12 at a predetermined distance from the fixed contact 16 (FIG. 8).
  • the manual opening of the circuit breaker is effected by a reverse tilting movement of the handle 22 (passage from FIG. 9 to FIG. 7). Under the action of its return spring 108, the pawl 102 disappears and remains in the inactive position, so as not to impede the free pivoting of the plate 40 and the support lever 50 in the counterclockwise direction to the position opening (figure 7).

Landscapes

  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Relay Circuits (AREA)
  • Keying Circuit Devices (AREA)
  • Electronic Switches (AREA)
EP86402267A 1985-10-31 1986-10-13 Mécanisme de commande pour disjoncteur électrique à basse tension Expired - Lifetime EP0224396B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86402267T ATE64234T1 (de) 1985-10-31 1986-10-13 Steuermechanismus fuer niederspannungslastschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8516344 1985-10-31
FR8516344A FR2589627B1 (fr) 1985-10-31 1985-10-31 Mecanisme de commande pour disjoncteur electrique a basse tension

Publications (2)

Publication Number Publication Date
EP0224396A1 EP0224396A1 (fr) 1987-06-03
EP0224396B1 true EP0224396B1 (fr) 1991-06-05

Family

ID=9324489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402267A Expired - Lifetime EP0224396B1 (fr) 1985-10-31 1986-10-13 Mécanisme de commande pour disjoncteur électrique à basse tension

Country Status (13)

Country Link
US (1) US4740770A (xx)
EP (1) EP0224396B1 (xx)
JP (1) JP2637081B2 (xx)
CN (1) CN1013816B (xx)
AT (1) ATE64234T1 (xx)
AU (1) AU589856B2 (xx)
CA (1) CA1279356C (xx)
DE (1) DE3679639D1 (xx)
ES (1) ES2022814B3 (xx)
FR (1) FR2589627B1 (xx)
IN (1) IN168773B (xx)
PT (1) PT83627B (xx)
ZA (1) ZA867970B (xx)

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FR2858109B1 (fr) * 2003-07-24 2005-10-14 Legrand Sa Mecanisme de serrure a accrochage tournant pour coupe-circuit automatique de securite
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CN108321057A (zh) * 2018-03-12 2018-07-24 宏秀电气有限公司 一种具有新型传动机构的小型断路器用自动重合闸装置
CN108461360B (zh) * 2018-03-29 2023-09-29 舍恩高电气有限责任公司 一种机械结构驱动的断路器重合闸机构
CN109216123B (zh) * 2018-09-04 2024-03-01 上海良信电器股份有限公司 一种电动操作装置驱动传动机构
CN111192775B (zh) * 2019-12-20 2021-10-29 天津平高智能电气有限公司 开关设备及其闭锁联锁装置

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Also Published As

Publication number Publication date
CA1279356C (en) 1991-01-22
FR2589627A1 (fr) 1987-05-07
ZA867970B (en) 1987-06-24
PT83627A (fr) 1986-11-01
DE3679639D1 (de) 1991-07-11
CN1013816B (zh) 1991-09-04
ATE64234T1 (de) 1991-06-15
IN168773B (xx) 1991-06-01
JP2637081B2 (ja) 1997-08-06
AU589856B2 (en) 1989-10-19
PT83627B (pt) 1990-06-29
EP0224396A1 (fr) 1987-06-03
JPS62105333A (ja) 1987-05-15
US4740770A (en) 1988-04-26
CN86107136A (zh) 1987-04-29
FR2589627B1 (fr) 1988-08-26
ES2022814B3 (es) 1991-12-16
AU6449786A (en) 1987-05-07

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