EP0385265B1 - Mécanisme d'entraînement à moteur à ressort pour disjoncteur - Google Patents

Mécanisme d'entraînement à moteur à ressort pour disjoncteur Download PDF

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Publication number
EP0385265B1
EP0385265B1 EP90103414A EP90103414A EP0385265B1 EP 0385265 B1 EP0385265 B1 EP 0385265B1 EP 90103414 A EP90103414 A EP 90103414A EP 90103414 A EP90103414 A EP 90103414A EP 0385265 B1 EP0385265 B1 EP 0385265B1
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EP
European Patent Office
Prior art keywords
drive shaft
spring
spring energy
drive according
energy drive
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
EP90103414A
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German (de)
English (en)
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EP0385265A1 (fr
Inventor
Max Kuhn
Rudi Schmidt
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General Electric Switzerland GmbH
Original Assignee
GEC Alsthom T&D AG
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Application filed by GEC Alsthom T&D AG filed Critical GEC Alsthom T&D AG
Publication of EP0385265A1 publication Critical patent/EP0385265A1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H01H3/3042—Power arrangements internal to the switch for operating the driving mechanism using spring motor using a torsion spring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/42—Driving mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/42—Driving mechanisms, i.e. for transmitting driving force to the contacts using cam or eccentric

Definitions

  • the present invention relates to a spring force drive for a circuit breaker, in particular a vacuum switch for medium voltage, according to the preamble of claim 1.
  • Such a spring force drive for a vacuum circuit breaker for medium voltage is described in the Calor-Emag-Mitteilungen I / II / 1986 on pages 9 to 12.
  • This known spring force drive has a drive shaft which is driven by a spiral spring for switching the circuit breaker on and off in the same direction of rotation.
  • a support disk with two support surfaces sits on the drive shaft in a rotationally fixed manner, which cooperate with a fixed, pivotably supported support member in the switch-on or switch-off position of the drive shaft.
  • On the drive shaft there is also a cam with one cam, the circumferential surface of which forms a control cam for a follower roller arranged at one end of a pivoting lever.
  • the other end of the pivot lever is connected to the movable switching contact of a vacuum interrupter via a contact pressure spring arrangement.
  • a switch-off spring also acts on the swivel lever, which presses the follower roller against the circumferential surface of the cam disk.
  • the support element releases the support plate and thus the drive shaft for a rotation of 270 °, whereby the movable switch contact is brought into the switch-on position via the cam plate acting on the follower roller and the swivel lever.
  • Both Contact pressure spring arrangement and the opening spring tensioned In order to open the circuit breaker, the support element releases the support disc for a rotation of 90 °.
  • the swivel lever and the movable switch contact are returned to the switch-off position by the switch-off spring according to the shape of the peripheral surface, the movement of the swivel lever being determined by the cam disc, against the circumferential surface of which the follower roller is pressed by the switch-off spring.
  • the switch-off springs are dimensioned considerably stronger than would be necessary to achieve the required speed of the movable switch contact. This means that large energies must be made available for switching, which causes large forces and a corresponding dimensioning in the drive.
  • DE-A-27 02 962 discloses a drive arrangement for a vacuum switch, in which a shaft is driven by means of an energy store for switching on the vacuum switch in one direction and for switching off in the opposite direction.
  • a disc with a C-shaped slot forming a control cam On the shaft there is a disc with a C-shaped slot forming a control cam, in which a roller of a roller plunger engages, which inevitably follows the movements of the disc and transfers the movable contact piece into the on and off position.
  • a particularly simple tensile and pressure-effective connection between the cam disk arrangement and the lifting member is achieved in one embodiment according to claim 2.
  • An embodiment according to claim 3 leads to a smooth, play-free movement.
  • a particularly easy to install spring force drive is achieved by the embodiment according to claim 12.
  • the drive can be adapted to different needs through the very simple exchange of elements sitting on the drive shaft.
  • the angle of rotation between the switch-off and the switch-on position can be freely selected by exchanging support levers.
  • the spring force drive is particularly well suited for a switch arrangement as specified in EP-A-0 346 603 or the corresponding US-A-5 015 809.
  • the circuit breaker for medium voltage has a spring drive 10 and three vacuum interrupters 12 driven by it.
  • the vacuum interrupters 12 and the connecting rods 14 between the respective vacuum interrupters 12 and the drive 10 are constructed identically and are described with reference to the pole shown on the left in FIGS. 1 and 3 and in FIG. 2.
  • Each vacuum interrupter 12 has a stationary switching contact 16 indicated by a broken line and a movable switching contact 20 arranged at the upper end of a switching plunger 18 (FIG. 1).
  • the switching plunger 18 is connected in an articulated manner via a pin 22 to a double-armed pivot lever 24, which at the other end is operatively connected via a contact pressure spring arrangement 26 to a cam plate arrangement 30 seated on a drive shaft 28 of the spring force drive 10.
  • Each of the three cam disk arrangements 30 has two spaced apart and oppositely formed disks 32, in each of which a groove 34 is stamped around the drive shaft 28, the grooves 34 being open in the direction of the axis 28 'of the drive shaft 28 and against one another, see in particular Figure 3.
  • a cylindrical and parallel to the drive shaft 28 extending follower 36 is guided, which is arranged on a bracket 38 extending approximately in the radial direction with respect to the drive shaft 28.
  • the tab 38 has an elongate passage 40 in the longitudinal direction of the tab 38, as is the case here in particular from Figure 1 in the two only partially shown tabs 38 for the middle and right switching tube 12 and Figures 2 and 3.
  • the disks 32 are punched out of sheet metal and the grooves 34 are embossed in the same operation, with protruding beads 48 being formed on the side of the disk 32 opposite the groove 34.
  • the grooves 34 run around the drive shaft 28 approximately eccentrically, the greatest distance between the groove 34 and the axis 28 'of the drive shaft 28 in the direction of this axis in the rotational position of the disks 32 shown in the figures 28 'to the follower 36 is located.
  • the direction of the shortest distance is shown in dash-dotted lines in FIG. 2, is designated by 50 and, viewed in the counterclockwise direction, is offset by approximately 150.degree.
  • the follower 36 In the position of the disks 32 shown in the figures, the follower 36 is in the lower end position in which the pivot lever 24, as shown in solid lines in FIG. 2, is pivoted clockwise and the movable switching contact 28 is brought into the switched-on position. However, if the disks 32 are rotated clockwise by 150 °, so that the shortest distance 50 is between the follower 36 and the axis 28 ', the follower 36 is raised to its upper end position in which the pivot lever is pivoted counterclockwise in the position 24 ⁇ shown in broken lines, the circuit breaker is turned off.
  • the link 38 Adjacent to the follower 36, the link 38 is articulated to a rocker 52 which runs approximately parallel to the pivot lever 24 and is also pivotally mounted on the chassis 46 by means of a shaft 54 at its end remote from the link 38.
  • the rocker 52 has two spaced-apart and parallel to each other rocker arms 52 ', which extend on both sides of the tab 38 and are connected to this by a pin 56.
  • a contact pressure spring 58 through which the tab 38 extends and which is supported on both ends on a spherical cap-shaped support disk 60, which in turn abuts the rocker 52 and the pivot lever 24.
  • the support disks 60 each have a slot-shaped recess 62 for the tab 38.
  • the contact pressure spring assembly 26 operates as follows. When the follower 36 is in the upper end position and the movable switching contact 20 is in the switched-off position, the contact pressure spring 58 presses the swivel lever 24 downward on the lower end plate 60 until the bolt 42 is in contact with the lower end of the passage 40. If, in the course of a rotation of the disks 32 in a clockwise direction by 210 °, the following link 36 into the lower one shown in the figures Moved to the end position, the pivot lever 24 pivots under the pressure of the prestressed contact pressure spring 58 in a clockwise direction until the movable switching contact 20 is in contact with the fixed switching contact 16.
  • a spring hub 64 is also non-rotatably seated on the drive shaft 28, to which the inner end 66 of a spiral spring 68 is fastened.
  • the outer end 70 of the spiral spring 68 is connected to a spring cage 72 which surrounds the spiral spring 68 in a sleeve-like manner and is connected in a rotationally fixed manner to a toothed wheel 74 which is freely rotatably mounted on the spring hub 64.
  • the spring hub 64 has a thicker wall in the area of the spiral spring 68 in the radial direction than in the section adjacent thereto in the radial direction in which the gear 74 is arranged.
  • a roller bearing 80 for the gearwheel 70 is located between the shoulder 76 of the spring hub 64 formed in this way and a sleeve 78 placed on the drive shaft 28 at this end, which roller roller 80 is also held immovably in the axial direction by this shoulder 76 and the sleeve 78.
  • the gear 74 meshes with the driven gear 82 one means an electric motor 84 driven reduction gear 86 ( Figure 1).
  • the rotation of the spring cage 72 against the winding direction of the spiral spring 68 is prevented by a freewheel or a backstop, not shown, which acts on a shaft of the reduction gear 86.
  • each double lever 88.90 On the drive shaft 68 there are also two single-armed double levers 88, 90, which are offset relative to one another and each cooperate with a support element 92 or 94. At the free end of each double lever 88.90, a support roller 88 'or 90' is held by means of a bolt 96. In the switch-on position shown in the figures, the support roller 88 'is supported against the force of the spiral spring 68 on the end face 98' of a double-arm support lever 98 of the support member 92 which is pivotably mounted on the chassis 46.
  • the end face 98 ' is inclined with respect to the support roller 88' in such a way that the support lever 98 experiences a force acting in the clockwise direction, the support lever 98 being secured in the switched-on position at its end opposite the end face 98 'by means of a support shaft 100 against rotation.
  • the support shaft 100 is also pivotally mounted on the chassis 46 and is connected in a rotationally fixed manner to a two-armed actuating lever 102.
  • the support shaft 100 has in the area of the support lever 98 a segment-shaped milling 104 through which the support lever 98 can pivot when the support shaft 100 is pivoted clockwise by hand using a switch-off button 106 or electrically by means of a switch-off magnet 108.
  • the support member 94 is constructed exactly the same as the support member 92 and is therefore no longer described in detail.
  • the support lever 110 is also supported on a support shaft 100 ', which has a corresponding milling 104' through which the support lever 100 can pivot when the support shaft 110 is rotated clockwise.
  • the support shaft 100 ' can also be pivoted clockwise via a double-armed actuating lever 102' by means of a switch 106 'by hand or electrically via a switch magnet 108'.
  • the drive shaft 28 has an essentially square cross-section (FIG. 2) and has a thread 112 at each of its two ends (FIG. 3) onto which a nut 114 is screwed.
  • the chassis 46 has two spaced and parallel bearing plates 46 ', through which the drive shaft 28 is guided and on which the drive shaft 28 is rotatably supported by means of ball bearings 116. Depending on the outside of the relevant bearing plates 46 'sit on the shaft, the two disks 32 of the cam plate assemblies 30 for the two outer vacuum interrupters 12.
  • the two double levers 88.90 and between these the two disks 32 of the cam plate arrangement 30 for the middle vacuum interrupter 12 and the spring hub 64 with the spiral spring 68, the spring cage 72 and the gear 74 are arranged.
  • the disks 32 of each cam disk arrangement 30 are spaced apart from one another by spacer sleeves 118 (FIG. 3), and further spacer sleeves 118 'are provided between the two outer cam disk arrangements 30 and the relevant ball bearing 116 or the relevant nut 114.
  • the double levers 88, 90 are welded to tubes 120, which have a free inner cross section which corresponds to the cross section of the drive shaft 28.
  • the free inner cross section of the spring hub 64 and the passages 122 in the disks 32 is also adapted to the cross section of the drive shaft 28 in order to connect them to one another in a rotationally fixed manner. All parts seated on the drive shaft 28 are held in the axial direction by means of the two nuts 114.
  • auxiliary switch 124 In the spring-loaded drive 10 there is also an auxiliary switch 124, only shown schematically, the movable contact of which can be actuated via the bead 48 of a disk 32 in question.
  • the auxiliary switch 124 is thus closed or opened depending on the respective rotational position of the drive shaft 28.
  • the auxiliary switch 124 is required for feedback purposes or for electrical locking of the spring-loaded drive 10.
  • the assembly of the spring force drive 10 is very simple.
  • the next drive elements are each plugged onto the drive shaft 28 and at the end these are braced against one another by means of the nuts 114.
  • the spring force drive 10 operates as follows. In the switch-on position shown in the figures, the spiral spring 68 by means of the electric motor 84 via the reduction gear 86, the gear 74 and the spring cage 72 clockwise by 360 °. The drive shaft 28 is prevented from rotating by the support member 92. In order to switch off the circuit breaker, the support shaft 100 is pivoted clockwise by hand by actuating the switch-off button 106 or electrically by activating the switch-off relay 108 in a clockwise direction. The support shaft 100 releases the support lever 98 which, as a result of the pressing force of the support roller 88 ', swivels clockwise through the milling 104.
  • the drive shaft 28 is released, which rotates clockwise by 150 ° under the force of the spiral spring 68 until the support roller 90 'of the double lever 90 comes to rest on the support lever 110.
  • the follower 36 is pulled upwards through the groove 34 into the upper end position. This movement is transmitted via the tab 38, the pivot lever 24 and the switching plunger 18 to the movable switching contact 20, which is moved into the off position.
  • the contact pressure spring 58 relaxes until the bolt 42 is in contact with the lower end of the passage 40.
  • the energy released by the spiral spring 68 and the contact pressure spring 58 is converted into kinetic energy, which is used, if appropriate, to detach switch contacts 16, 20 welded to one another. Under the force of the spiral spring 68, the movable switching contacts 20 are transferred to the off position.
  • the support shaft 100 ' is swiveled clockwise by the user by pressing the switch 106' or electrically by activating the switch-on relay 108 '.
  • the support lever 110 and thus the double lever 90 are released in a corresponding manner.
  • the drive shaft 28 rotates through 210 ° until the support roller 80 'of the double lever 88 strikes the support lever 98 of the support member 92.
  • the follower 36 is transferred from the upper end position into the lower end position shown in the figures and the switch into the switch-on position.
  • the contact pressure spring 58 is tensioned.
  • part of the energy to be released by the spiral spring 68 is first converted into kinetic energy in order to achieve the desired stroke-time profile of the movable switching contact 20.
  • the spiral spring 68 is in turn pulled up by 360 °.
  • the coil spring 68 is preloaded to such an extent that when the coil spring 68 is fully opened, the stored energy is sufficient for a reclosure to switch on and reclosure, the spring cage 72 rotating again by 360 as soon as the switch-on position is reached ° is driven.
  • the follower 36 is inevitably guided in the grooves 34, whereby a positive connection is formed with respect to the direction of movement of the tab 38 between the follower 36 and the washers 32.
  • the position of the movable switching contact 20 thus always corresponds to the position of the drive shaft 28, corrected in each case by the differential stroke absorbed by the contact pressure spring 58 or the passage 40.
  • the end shields 46 ' can be formed on an insulating support frame which engages around the vacuum interrupters 12 at least partially and to which the vacuum interrupters 12 can be attached. It is of course also conceivable that only a single cam disc arrangement is provided and the stroke of the follower 36 is transmitted to all vacuum interrupters 12 via common actuating members.
  • the follower is arranged on a pivot lever. It is also possible to couple the tab directly to the contact plunger without a swivel lever if the spring-loaded drive 10 and the vacuum interrupters are mutually corresponding Have location. Instead of vacuum interrupters, other interrupters can also be provided. By replacing individual drive elements, the spring-loaded drive can be adapted to the requirements of a wide variety of interrupters.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Transmission Devices (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Claims (15)

  1. Commande par ressort pour un interrupteur de puissance, en particulier un interrupteur à vide pour moyenne tension, comprenant un arbre moteur (28) mû dans le même sens de rotation pour la fermeture et l'ouverture de l'interrupteur de puissance (12) au moyen d'un dispositif de ressort (68) et empêché de tourner, à la position d'ouverture et à la position de fermeture, au moyen de dispositifs d'appui (92, 94), avec la possibilité de libérer l'arbre moteur (28), sur lequel est calé au moins un disque (32) d'un dispositif de came (30), possédant un profil de came (34) agissant dans le sens de la poussée sur un élément à mouvement alternatif (36, 38), lui-même relié fonctionnellement à au moins un contact mobile (20), afin de déplacer l'élément à mouvement alternatif (36, 38) en va-et-vient entre deux positions de fin de course, caractérisée en ce que le disque (32) présente au moins une rainure (34), constituant le profil de came, qui s'étend sans fin autour de l'arbre moteur (28), est ouverte en direction de cet arbre et agit également dans le sens d'une traction sur l'élément à mouvement alternatif (36, 38).
  2. Commande par ressort selon la revendication 1, caractérisée en ce qu'elle comprend un élément suiveur (36) prévu sur l'élément à mouvement alternatif (36, 38) et guidé dans la rainure (34).
  3. Commande par ressort selon la revendication 1 ou 2, caractérisée en ce que l'élément à mouvement alternatif (36, 38) est guidé de façon forcée dans la rainure (34).
  4. Commande par ressort selon une des revendications 1 à 3, caractérisée en ce que, dans le cas d'un interrupteur de puissance à plusieurs pôles, elle comprend, pour chaque pôle, un dispositif de came (30) et un élément à mouvement alternatif (36, 38) relié fonctionnellement au contact mobile (20) du pôle concerné.
  5. Commande par ressort selon une des revendications 2 à 4, caractérisé en ce que le dispositif de came ou chaque dispositif de came (30) comporte deux disques (32) mutuellement espacés dont les rainures (34) s'ouvrent l'une vers l'autre, et l'élément suiveur (36, 38) est guidé dans les deux rainures (34).
  6. Commande par ressort selon une des revendications 2 à 4, caractérisée en ce que le disque présente une rainure sur chacun des deux côtés, rainure qui constitue le profil de came, s'étend autour de l'arbre moteur et est ouverte en direction de cet arbre, l'élément à mouvement alternatif est réalisé en forme de fourche et chaque branche de cet élément est munie d'un élément suiveur guidé dans la rainure correspondante.
  7. Commande par ressort selon une des revendications 1 à 6, caractérisée en ce que les rainures sont fraisées dans les disques.
  8. Commande par ressort selon une des revendications 1 à 5, caractérisée en ce que les disques (32) sont découpés dans une tôle et les rainures (34) sont formées dans les disques par repoussage, de préférence dans la même opération.
  9. Commande par ressort selon la revendication 8, caractérisée en ce qu'elle comprend des moyens de commutation (124) prévus sur les côtés de disques (32) opposés aux rainures (34) et pouvant être actionnés par les bourrelets (48) formés lors de la réalisation des rainures (34) par repoussage.
  10. Commande par ressort selon une des revendications 1 à 9, caractérisée en ce que l'élément à mouvement alternatif (36, 38) agit sur le contact (20) concerné par l'intermédiaire d'un dispositif de ressort de pression de contact (26), lequel est de préférence précontraint et agit à la position détendue par traction, l'action sur le contact s'effectuant éventuellement avec Interposition d'un levier oscillant (24).
  11. Commande par ressort selon une des revendications 1 à 10, caractérisée en ce que l'élément à mouvement alternatif (36, 38) est constitué par une bielle dont l'étendue longitudinale est de préférence orientée pour l'essentiel à angle droit par rapport à l'arbre moteur (28) et qui est montée sur deux éléments oscillants (24, 52) dont l'un est formé de préférence par le levier oscillant (24).
  12. Commande par ressort selon une des revendications 1 à 11, caractérisée en ce que l'arbre moteur (28) présente une section droite polygonale ou en forme d'étoile et tous les éléments (30, 32, 64, 88, 90) reliés solidaires en rotation à l'arbre moteur (28), sont enfilés sur lui à complémentarité de formes, éventuellement avec interposition de pièces d'entretoisement (118, 118′, 120), et sont maintenus en direction axiale au moyen d'éléments de maintien (114).
  13. Commande par ressort selon la revendication 12, caractérisée en ce que l'arbre moteur (28) porte, solidaires en rotation avec lui, deux leviers d'appui (88, 90) mutuellement décalés qui coopèrent chacun avec un organe d'appui (92, 94) prévu à un point fixe en vue du maintien de l'arbre moteur (28), avec la possibilité de le libérer, à la position d'ouverture et à la position de fermeture.
  14. Commande par ressort selon la revendication 12 ou 13, caractérisée en ce que le dispositif de ressort comprend un ressort spiral (68) dont une extrémité intérieure (66) est reliée fonctionnellement à un moyeu de ressort (64) calé sur l'arbre moteur (28) et dont l'extrémité extérieure (70) est reliée à une cage de ressort (72) montée de façon à pouvoir tourner librement, de préférence sur le moyeu de ressort (64), cage qui est reliée fonctionnellement à un verrou antiretour et à un organe de remontage (84).
  15. Commande par ressort selon une des revendications 1 à 14, caractérisée en ce que l'arbre moteur et, de préférence, d'autres pièces de commande, sont montés sur au moins un flasque formé d'un seul tenant sur un cadre porteur isolant de l'interrupteur de puissance, cadre qui entoure au moins partiellement les éléments interrupteurs ou les tubes interrupteurs à vide.
EP90103414A 1989-03-03 1990-02-22 Mécanisme d'entraînement à moteur à ressort pour disjoncteur Expired - Lifetime EP0385265B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH80089 1989-03-03
CH800/89 1989-03-03

Publications (2)

Publication Number Publication Date
EP0385265A1 EP0385265A1 (fr) 1990-09-05
EP0385265B1 true EP0385265B1 (fr) 1994-10-12

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EP90103414A Expired - Lifetime EP0385265B1 (fr) 1989-03-03 1990-02-22 Mécanisme d'entraînement à moteur à ressort pour disjoncteur

Country Status (7)

Country Link
US (1) US4996397A (fr)
EP (1) EP0385265B1 (fr)
JP (1) JP3025970B2 (fr)
AT (1) ATE112885T1 (fr)
DE (1) DE59007411D1 (fr)
DK (1) DK0385265T3 (fr)
ES (1) ES2060832T3 (fr)

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US4996397A (en) 1991-02-26
DE59007411D1 (de) 1994-11-17
EP0385265A1 (fr) 1990-09-05
JPH02278626A (ja) 1990-11-14
ES2060832T3 (es) 1994-12-01
JP3025970B2 (ja) 2000-03-27
DK0385265T3 (da) 1994-11-14
ATE112885T1 (de) 1994-10-15

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