EP0310468A1 - Schutzschalter mit Blende zum Unterbrechen des Lichtbogens - Google Patents

Schutzschalter mit Blende zum Unterbrechen des Lichtbogens Download PDF

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Publication number
EP0310468A1
EP0310468A1 EP88402234A EP88402234A EP0310468A1 EP 0310468 A1 EP0310468 A1 EP 0310468A1 EP 88402234 A EP88402234 A EP 88402234A EP 88402234 A EP88402234 A EP 88402234A EP 0310468 A1 EP0310468 A1 EP 0310468A1
Authority
EP
European Patent Office
Prior art keywords
lever
hook
screen
trigger
pivoting
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.)
Withdrawn
Application number
EP88402234A
Other languages
English (en)
French (fr)
Inventor
André Cheurlin
Patrick Comtois
Jean-Christophe Deschamps
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.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique 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 La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Publication of EP0310468A1 publication Critical patent/EP0310468A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/32—Insulating body insertable between contacts

Definitions

  • the present invention relates to a single-pole or multi-pole protective electrical switch device enabling a power cut following an automatic triggering in the event of a short-circuit overcurrent or an opening by manual control and comprising in a housing: - at least one fixed contact and one mobile contact, - a movable arm carrying the movable contact and resiliently biased in the direction of closing the contacts, - a trigger device comprising a trigger member and a lock, and having an operating threshold on a short-circuit overcurrent from which the lock is actuated by the trigger member and cooperates with the contact-carrying arm to cause displacement of the latter in the direction of opening the contacts, - a movable arc cut-out screen occupying a rest position towards which it is returned by a spring and being driven by the tripping device in response to a short-circuit overcurrent to intervene between the contacts, - A manual control member connected to a control mechanism cooperating with the contact-carrying arm to actuate by movement of the control member a movement of
  • Such a switch device known as an arc cut-off screen is described in patent FR 2 577 712.
  • This device is a circuit breaker whose role is to electrically isolate and protect a motor starter assembly against short circuits. (contactor, thermal relay).
  • the arc cut-off screen is only activated after the triggering threshold on short circuit of the automatic tripping device and therefore only participates in the cut-off in the event of a short circuit.
  • the object of the present invention is in particular to request the same arc cut-off screen both during automatic triggering at high overcurrents, that is to say for short-circuit currents, as during opening by manual control at low currents, i.e. for overload currents, or even at currents less than or equal to the nominal currents.
  • Another purpose is to prevent the manual unlocking or triggering of the mechanical lock of the device during manual opening, which advantageously makes it possible to dispense with the resetting of the latter following manual opening.
  • a protection switch device of the type described above is more particularly characterized in that it comprises a member for lowering the operating threshold of the triggering device in the event manual opening, subject to the manual control member and connected to the release device to reduce the resistant forces affecting it in the event of manual opening, so that the screen is driven by the release device during '' a manual opening in order to interpose between the contacts.
  • the proposed solution thus makes it possible to benefit from the action of the screen by playing with the aid of simple means on the operating threshold of the triggering member in order to promote cutting during manual opening.
  • the threshold lowering member is constituted by a pivoting lever interposed between the trigger member and the lock, which is actuated at one end by the trigger member in response to a short-circuit overcurrent. circuit, said lever being provided with a control element for actuating the lock in the event of a short circuit, and which can be erased with respect to the triggering member using the control mechanism in the event of opening manual.
  • the aforementioned lever is mounted on a ball joint and has at its end opposite the trigger member relative to the ball joint a bent arm forming a ramp, and the control mechanism comprises a movable rocker rocker by the manual control member and provided with a cam link cooperating during manual opening with the ramp of the lever to cause the latter to pivot so as to erase it from the triggering member.
  • the plunger core is extended axially at its end opposite the screen by a pusher acting in the event of a short circuit by percussion on the lever mentioned above to cause the latter to pivot in order to actuate the lock via the control element.
  • the threshold lowering member consists of a pivoting screen retaining hook, urged by a return spring and erasable against the spring using the control mechanism in the event of manual opening so as to free the screen.
  • the switch device is designated by the general reference 10 and comprises a housing 11 in which are housed at least one fixed contact 12 and one movable contact 13.
  • the fixed contact 12 is electrically connected to one end of a winding 14 of a coil 15 belonging to an electromagnet which constitutes the automatic short-circuit tripping member 16 of the device in question, which winding is itself connected by its other end to an input terminal 17 via a fixed connection part 18;
  • the movable contact 13 is arranged at one end of a contact-carrying arm 19 and is electrically connected by a braid 20 and a fixed connection part 21 to an output terminal 22.
  • the contact carrier arm 19 is pivotally mounted at its end opposite the movable contact 13 on a bearing 23 of axis A1 and is biased in the direction of closing of the contacts by a return spring not shown.
  • the electromagnetic trip device 16 also comprises a mobile magnetic core 24 shaped as a plunger and mounted to slide inside the coil 15.
  • the plunger core 24 of the trigger 16 has an axial extension 25 forming a pusher, the role of which will be explained below; this pusher has a length such that its head 25a projects from the coil 15 when the plunger core 24 is in the rest position (FIG. 1).
  • the rotary screen 27 normally occupies a rest position (FIG. 1) to which it is recalled by a torsion spring 30.
  • the switch 10 also comprises a pivoting lever 31 of axis YY which is interposed between the electromagnetic trip device 16 and a mechanical lock for automatic triggering designated by the general reference 34, and which is mounted so as to pivot around the axis YY under the action of the plunger core 24 during a short circuit overcurrent in order to actuate the lock 34, which lock is itself capable of acting in response to this pivoting of the lever 31 on the contact carrier arm 19 in the direction of opening the contacts.
  • the lever 31 is mounted for free rotation around a pivot 36 of axis YY in the housing 11 while being articulated on a ball joint 37 capable of turning in a housing 38 formed in the housing between two coaxial bearings 39, 40; the lever 31 normally occupies a rest position ( Figure 1) to which it is returned by a torsion spring 42 one end of which is anchored on said lever and the other end of which is supported on a stop 43 provided in the housing 11.
  • the pivoting lever 31 has a first radial control arm 31a intended to actuate the lock 34 only during tripping on a short circuit, as well as a second rectilinear radial arm 31b extending, in the closed position of the contacts (FIG. 1), in a direction substantially perpendicular to that of the plunger core 24 while being placed, at a short distance, in front of the head of the pusher 25.
  • the lock 34 in the armed position (FIG. 1) comprises a trigger lever 45 pivotally mounted on a bearing 46 of axis A2 parallel to the axis A1 and provided with a drive pin 47 of the contact carrier arm 19; the lever 45 also has a spoiler 48 (better visible in FIG. 2) which cooperates with a rotary hook 49 of axis A3 parallel to the axis A2.
  • the hook 49 (FIG. 3) is a cylindrical shaft of axis A3 having a transverse relief groove 51 in the form of a U with a flat bottom, one of the edges of the bottom of this groove delimiting circumferentially with a generator of the shaft a bearing face 51a against which the spoiler 48 (FIG. 1) of the lever 45 is applied.
  • the hook 49 is further provided with a pointed finger 53 slightly inclined downwards (FIG. 1) on which is arranged, possibly with a slight play, the free end 54 of spherical shape of the arm 31a of the lever 31.
  • the trigger lever 45 and hook 49 cooperating are mounted in the housing so that in response to the clockwise pivoting of the lever 31 around its axis YY during a tripping on short circuit, the arm 31a of the lever 31 requests the finger 53 of the hook 49 and swings the latter against a return spring which is not shown to allow the spoiler 48 of the lever 45 to be released to the right by the groove 51 and a counterclockwise pivoting of the lever 45, see figure 6.
  • the lever 45 in the released position is biased by a non-illustrated trigger spring whose force is significantly greater than that of the return spring of the contact carrier arm 19 to allow sufficient movement of said arm under the action of a pin of drive 47 in the direction of opening the contacts ( Figure 6). It is further provided in the trigger lever 45, behind the spoiler 48, a corner 56 (visible in Figure 2) abutting against the bottom of the groove 51 of the pivoting hook 49 at the end of opening of the contacts.
  • the automatic short-circuit tripping phase described above for this embodiment of the switch device 10 with screen takes place for a short-circuit current value equal to or greater than the trigger threshold of the electromagnetic trip device 16, threshold which is defined for a given value multiple of the nominal current of the device and from which the plunger core 24 acts, as we have seen, to allow: - On the one hand, the opening of the contacts by actuation of the pivoting lever 31 and triggering by means of the latter of the mechanical lock 34 and this against the resistant forces affecting the latter, which forces are essentially due in this case to the lever 45 - hook 49 control, and - on the other hand, the drive of the screen 27 and this against the force of its return spring 30.
  • a manual control button 60 located outside the housing 11 cooperates with a control rocker 61 of the contact carrier arm; the button is pivotally mounted around an axis A4 perpendicular to the axis A1 while the rocker is pivotally mounted on a bearing 62 of axis A5 parallel to the axis A1.
  • a suitable mechanical linkage with engagement and / or cam makes it possible to transform the rotary movement of the button 60 into a correlative rotary movement of the rocker 61.
  • the bearing 62 of the rocker 61 is mounted in the housing through a central recess 64 formed in the trigger lever 45, which recess also allows a certain movement of the lever 45 relative to said bearing during its rotation about the axis A2 .
  • the rocker 61 illustrated in perspective in FIG. 4 is formed by a shaft of axis A5 surmounted by an annular sector 65 having an imprint with two notches 65a, 65b intended to cooperate with a connecting piece 67 carrying tenons 67a, 67b ( Figures 1, 6, 8 and 10); the part 67 is capable of rotating around the axis A4 in response to the pivoting of the button 60 and it has, for this purpose, a square 67c cooperating with a recess 60a of the button 60.
  • the rocker 61 has a projection or other support element 69 capable of being applied to an area of the contact-carrying arm 19 situated between the axis A1 and the contact 13 so that a counterclockwise rotation of the rocker 61 during a manual opening control causes pivoting in the same direction, therefore counterclockwise, of the arm 19.
  • the rocker 61 also has a projecting surface 70 intended to attack a portion forming a cam 72 provided on the periphery of the recess 64 of the lever 45 (FIG. 2) during the resetting phase following a short-circuit tripping.
  • a cam connection is, moreover, provided between the rocker 61 and the lever 31 so that the counterclockwise rotation of the rocker 61 during a manual opening control causes the ball 31 to tilt the lever 31 in a plane perpendicular to that passing through its axis YY in order to retract or erase the arm 31b of the lever with respect to the pusher 25 of the plunger core of the trigger 16.
  • the rocker 61 has a radial tab 71 of flat and elongated shape ending in two parallel fingers 71a, 71b ( Figure 4) forming between them a slide 73 in which is engaged transversely the free end of a third arm 31c of the lever 31, which arm is formed in the lever the opposite of the arm 31b relative to the ball 37.
  • This arm 31c of the lever 31, seen in elevation is approximately in the form of an arc of a circle centered on the spherical end of the arm 31a so that it can move freely in the slide 73 during a clockwise pivoting of the lever 31; seen from the side ( Figures 5, 7, 9 and 11), this same arm 31c has an angled shape defining an inclined ramp 75 intended to be attacked on either side by the two fingers 71a, 71b of the tab 71 of the rocker 61 in response to the counterclockwise pivoting thereof so as to tilt the lever 31 in a plane perpendicular to that passing through its axis YY and to erase the arm 31b of the lever with respect to the pusher 25 of the plunger core 24 of the trigger.
  • the support element 69 and the slide tab 71 of the rocker 61 are arranged relative to each other so that the counterclockwise pivoting of the rocker during a manual opening command first causes separation of contacts by means of the element 69, then the erasing of the lever 31 by means of the cam connection lug 71 - arm 31c.
  • the pivoting lever 31 constitutes, according to the invention, a member for lowering the operating threshold of the electromagnetic trip device 16 in the event of manual opening allowing the screen to be driven by means of the core plunger, without triggering of the mechanical lock: in fact, as a result of the erasing of the lever 31 with respect to the plunger core 24 during a manual opening command, the resistant forces opposing the action of the plunger are considerably reduced and are no longer due in fact only to the screen return spring
  • the driving of the screen under the action of the plunger core 24 during a manual opening is only intended for breaking overload currents, i.e. currents with a value greater than that of the rated current of the device. It should however be noted that it is also possible to envisage a screen drive following a manual opening command for currents of value less than or equal to that of the nominal current by appropriately adjusting the return force of the 'screen.
  • the electromagnetic trip device 16 of the device 10 in fact constitutes a magnetic system with two intensity thresholds, one being assigned for automatic triggering in the event of a short circuit, in which the device operates in circuit breaker mode, the other for opening by manual control in the event of an overload, or even in normal service, in which case the device operates in switch mode.
  • Figures 1, 6, 8 and 10 show the embodiment of the switch device 10 described above in the respective positions of: - contact closure, - cut-off following an automatic tripping on short circuit, - disconnection following an opening by manual control, - reset following a trip.
  • the arm 31b of the lever 31 extends perpendicularly to the pusher 25 of the plunger core 24 facing it, while the arm 31c is engaged transversely at the end of its ramp part 75 (visible in FIG. 5) in the slide 73 of the rocker 61.
  • the button 60 capable of rotation about the axis A4 occupies the on position (denoted “1" in FIG. 12) and cooperates via the connecting piece 67 with studs 67a, 67b with the notch imprint 65a , 65b of rocker 61.
  • the device reaches the trigger position shown in FIG. 6 when a short-circuit current flows through the coil 15 of the trigger electromagnet 16.
  • the plunger core 24 is then attracted and moves to the left by rotating the screen 27 clockwise and by striking its lever 25 with lever 31 to do so rotate clockwise; the arm 31c of the lever 31 moves freely in the slide 73 of the rocker 61, the position of which is not changed during the triggering.
  • the opening of the contacts in response to the triggering of the lock 34 following the clockwise pivoting of the lever 31 takes place in a manner which has been described previously.
  • the device is put in the open position (figure 8) when the operator turns the button 60 around the axis A4 to bring it from the on position to the stop position (noted "0" in figure 12 ).
  • the rotation of the button 60 is then 90 ° but can of course be carried out on a different angle.
  • the rotation of the button 60 from “1" to “0” determines the rotation around the axis A4 of the connecting piece 67 whose tenon 67a engages in the notch 65b of the imprint of the rocker 61. It results in a counterclockwise pivoting of the rocker 61 about the axis A5 during which, on the one hand, the support element 69 of said rocker causes a counterclockwise pivoting of the contact-carrying arm 19 (FIG.
  • the pivoting of the rocker 61 also causes by means of the fingers 71a, 71b of its tab 71 an erasure of the lever 31, slightly more accentuated than in the case of manual opening, vis-à-vis the pusher 25 of the plunger core (FIG. 11) .
  • the switch 10 of FIGS. 13 to 16 comprises a rotary hook 102 which is intended to retain the screen 27 in the closed position of the contacts (FIG. 13) while being biased by a return spring shown diagrammatically at 103, whose force is significantly greater than that of the spring 30, and which is displaceable or erasable against the spring 103 under the action of a control rocker 106 of the contact carrier arm during a manual opening control (figure 15) to release the screen 27.
  • This hook 102 is presently constituted by a pivoting shaft with a fixed axis A6 parallel to the axis A1 and provided with a spoiler 107 or other hooking element which is applied in position. for closing the contacts (FIG. 13) against a notch 27a provided on the screen 27.
  • the rocker 106 is pivotally mounted around the axis A5 and cooperates with the button 60 via the connecting piece 67; it has, in addition to the notch imprint 65a, 65b and the support element 69, a drive shank 109 capable of being applied to the hook 102 so that a rotation of the rocker 106 during a manual control of opening causes the hook 102 to pivot, allowing the spoiler 107 to be released in the direction of release of the screen 27.
  • the support element 69 and the drive tail 109 of the rocker 106 are arranged relative to each other so that a pivoting of the rocker during a manual opening command first causes the separation of the contacts by means of the element 69, then the erasure of the hook 102 by means of the tail 109.
  • the drive tail 109 of the rocker 106 is shaped so as to maintain in the erasing position the hook 102 in response to the pivoting of the rocker 106 during manual opening.
  • a lock designated by the general reference 110 of the switch 10 of FIGS. 13 to 16 comprises, in addition to the rotary hook 49 (the point finger 53 of the latter being directed vertically downwards in the armed position visible in FIG. 13) a trigger lever 112 which differs from an embodiment by the fact that it has a drive element 113 intended to be applied against a support 114 provided on the hook 102 in order to maintain the latter in the erasing position during a tripping on short circuit (figure 14).
  • the electromagnetic trip device 116 implemented in this variant of the switch 10 comprises, in addition to the plunger core 24 surrounded by the coil 15, a mobile magnetic armature 117 known as percussion actuating the lock 110 during tripping on short circuit.
  • This frame 117 is presently shaped as a pallet pivotally mounted on a fixed axis A7 and subject to a return spring shown diagrammatically at 118.
  • This electromagnetic short-circuit trip device 116 is dimensioned so that from a certain operating threshold, the armature 117 and the plunger core 24 act almost simultaneously to allow: on the one hand, the opening of the contacts by triggering of the lock 110 under the action of the armature 117, and - on the other hand, the drive of the screen 27 under the action of the plunger core 24 and this against the efforts of the respective return springs 30, 103 of the screen 27 and of the hook 102.
  • the hook 102 is uncoupled from the screen 27 under the action of the rocker 106 during a manual opening command, which amounts to relieving the kinematic connection of the plunger core 24 - screen 27 of the force of the return spring 103; consequently, the plunger core 24 can move and drive the screen 27 against the single return spring 30.
  • the pivoting hook 102 for retaining the screen constitutes, according to the invention, a member for lowering the operating threshold of the electromagnetic trip device 116 in the event of manual opening allowing the driving of the screen by means of the plunger core, without triggering the lock: in fact, as a result of the erasure of the hook 102 during a manual opening command, the resistant forces opposing the action of the plunger core are considerably reduced and they are no longer due in fact only to the return spring of the screen.
  • the driving of the screen 27 under the action of the plunger core 24 during a manual opening is only intended for breaking overload currents, that is to say currents with a value greater than that of the rated current of the device. It is also possible to envisage driving the screen following a manual opening command for currents of value less than or equal to that of the nominal current by appropriately adjusting the return force of the screen 27.
  • the hook 102 is urged by its return spring 103 to retain or lock the screen 27 by means of its spoiler 107.
  • the button 60 occupies the position "1" of the Figure 12 and cooperates via the connecting piece 67 with studs 67a, 67b with the indentation 65a, 65b of the rocker 106.
  • the current flows from terminal 17 to terminal 22 through winding 14 of the release coil 116, the fixed contact 12, the movable contact 13 via the connections indicated in dashes.
  • the device In the event of a short circuit, the device reaches the tripping position shown in FIG. 14.
  • the plunger core 24 and the armature 117 are then attracted and act as follows:
  • the frame 117 pivots clockwise against its return spring 118 and actuates the lock 110 by percussion on the finger 53 of the hook 49.
  • the triggering of the lock 110 and the opening of the resulting contacts s 'perform in a similar manner to that already described with reference to Figure 6.
  • the plunger core 24 moves to the left by rotating the screen 27 clockwise and this against the efforts of the return springs 30, 103.
  • the rotation of the screen 27 causes the hook 102 to pivot in a counterclockwise direction which is held in the erasing position by application of the drive element 113 of the lever 112 on the 'support 114 when the lock 110 is triggered, so that said hook 102 does not prevent the return of the screen 27 after power cut.
  • the device is put in the open position ( Figure 15) when the operator turns the knob 60 from position "1" to position "0".
  • this rotation of the button 60 causes the rocker 106 to rotate counterclockwise via the part 67.
  • the rocker 106 causes, firstly, by means of its support element 69 a counterclockwise pivoting of the contact-carrying arm 19 and, secondly, by means of its drive tail 109 a counterclockwise pivoting of the hook 102 allowing the spoiler 107 to be released from that -this and therefore the release of the screen 27.
  • the manual control of the contact arms or bridges 19 of the various poles is carried out from the button 60 on as many rockers 61, respectively 106, as there are has poles, the rockers being coupled together.

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EP88402234A 1987-10-02 1988-09-06 Schutzschalter mit Blende zum Unterbrechen des Lichtbogens Withdrawn EP0310468A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8713620A FR2621417B1 (fr) 1987-10-02 1987-10-02 Interrupteur de protection a ecran de coupure d'arc
FR8713620 1987-10-02

Publications (1)

Publication Number Publication Date
EP0310468A1 true EP0310468A1 (de) 1989-04-05

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Application Number Title Priority Date Filing Date
EP88402234A Withdrawn EP0310468A1 (de) 1987-10-02 1988-09-06 Schutzschalter mit Blende zum Unterbrechen des Lichtbogens

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EP (1) EP0310468A1 (de)
FR (1) FR2621417B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2466601A1 (de) 2010-12-20 2012-06-20 Schneider Electric Industries SAS Unterbrechungsvorrichtung mit Monitor mit Lichtbogenunterbrechung
CN115094485A (zh) * 2022-06-24 2022-09-23 重庆国丰实业有限公司 一种电解槽阳极的转运装置的自动开、锁机构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0189689A1 (de) * 1984-12-28 1986-08-06 Telemecanique Elektrischer Schalter mit Blende
EP0193440A1 (de) * 1985-02-14 1986-09-03 Telemecanique Schutzschalter
FR2596916A1 (fr) * 1986-04-04 1987-10-09 Telemecanique Electrique Disjoncteur bipolaire a ouverture automatique ou manuelle avec electro-aimant bistable et noyau percuteur magnetisable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0189689A1 (de) * 1984-12-28 1986-08-06 Telemecanique Elektrischer Schalter mit Blende
EP0193440A1 (de) * 1985-02-14 1986-09-03 Telemecanique Schutzschalter
FR2596916A1 (fr) * 1986-04-04 1987-10-09 Telemecanique Electrique Disjoncteur bipolaire a ouverture automatique ou manuelle avec electro-aimant bistable et noyau percuteur magnetisable

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2466601A1 (de) 2010-12-20 2012-06-20 Schneider Electric Industries SAS Unterbrechungsvorrichtung mit Monitor mit Lichtbogenunterbrechung
FR2969366A1 (fr) * 2010-12-20 2012-06-22 Schneider Electric Ind Sas Dispositif de coupure a ecran de coupure d'arc
US8686311B2 (en) 2010-12-20 2014-04-01 Schneider Electric Industries Sas Breaking device with arc breaking shield
CN115094485A (zh) * 2022-06-24 2022-09-23 重庆国丰实业有限公司 一种电解槽阳极的转运装置的自动开、锁机构
CN115094485B (zh) * 2022-06-24 2023-08-29 重庆国丰实业有限公司 一种电解槽阳极的转运装置的自动开、锁机构

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Publication number Publication date
FR2621417B1 (fr) 1989-12-22
FR2621417A1 (fr) 1989-04-07

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