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EP0174904B1 - Dispositif de contact pour disjoncteur basse tension avec un levier de contact à deux bras - Google Patents

Dispositif de contact pour disjoncteur basse tension avec un levier de contact à deux bras Download PDF

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Publication number
EP0174904B1
EP0174904B1 EP85730104A EP85730104A EP0174904B1 EP 0174904 B1 EP0174904 B1 EP 0174904B1 EP 85730104 A EP85730104 A EP 85730104A EP 85730104 A EP85730104 A EP 85730104A EP 0174904 B1 EP0174904 B1 EP 0174904B1
Authority
EP
European Patent Office
Prior art keywords
contact
lever
contact lever
arrangement according
bearing pin
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
EP85730104A
Other languages
German (de)
English (en)
Other versions
EP0174904A1 (fr
Inventor
Bernhard Dipl.-Ing. Preuss
Karl-Heinz Ing. Grad. Manthe
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0174904A1 publication Critical patent/EP0174904A1/fr
Application granted granted Critical
Publication of EP0174904B1 publication Critical patent/EP0174904B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/32—Self-aligning contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/205—Details concerning the elastic mounting of the rotating bridge in the rotor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H2001/223—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member using a torsion spring

Definitions

  • the invention relates to a contact arrangement for low-voltage circuit breakers, in particular current-limiting circuit breakers, with a two-armed contact lever which can be moved about a central bearing, which is provided at its ends on opposite sides of a longitudinal axis crossing the axis of rotation, each with a switching element and the lever arms of which are each assigned a contact force spring is.
  • a contact arrangement of this type has become known from DE-OS 21 57 927.
  • such a contact arrangement has the advantage that no flexible current band is required in the current path of the switch, because the two-armed contact lever connects two fixed counter switching elements to one another in a bridge-like manner. When switching, two disconnection points connected in series are thus created.
  • the prerequisites for a high switching capacity are met.
  • the invention has for its object to improve the storage, the drive and the generation of the contact force of a rotary contact system.
  • the bearing pin is fixedly connected to the shift lever or is arranged independently of it, because the contact lever has the possibility of alignment in both cases.
  • the contact levers are arranged in switching chambers arranged parallel to one another, however, it is advantageous to provide a common fixed bearing pin and to arrange the elongated holes on the contact levers.
  • the contact lever can be provided with two stop surfaces arranged symmetrically to its center and there can be two drivers. This results in a symmetrical application of force.
  • An effective current limitation can be achieved in that the driver is or are arranged in relation to the contact lever with a freewheel in such a way that the contact lever can move into an open position when the driver or drivers are in the unchanged position.
  • the opening position can correspond to the normal switch-off position or even a larger opening angle if a high current limitation is sought. It is advantageous that the rotation of the contact lever can take place independently of the drive parts only against the action of the contact force spring.
  • the drivers can be part of a switching shaft rotatable about the bearing pin. A driving force can be introduced into this from a space lying next to the switching chamber and therefore easily separable from it. Furthermore, such a switching shaft is best suited to effect a common drive of the contact levers of a multi-pole switch.
  • the contact force springs can advantageously be designed as torsion springs enclosing the bearing pin, one leg of which is supported on a counter surface of the control shaft and the other leg of which is supported on the contact lever.
  • the contact force springs are relatively far away from the contact points in this arrangement, which reduces the risk that the properties of the contact force springs are adversely affected by the switching arcs.
  • the contact springs designed as torsion springs are accommodated in one pocket of a housing carrying the contact arrangement and that the wall parts of the pocket limit certain slots for the passage of legs of the contact lever.
  • the wall parts hereby form an additional protection of the contact force springs against impairment by switching arcs.
  • the contact lever is designed in the form of a circular arc near its center on the side of the switching pieces. This leaves the space between the contact lever and the tub at this point manure parts the same regardless of the angular position when switching, so that the arc gases occurring during switching find a high flow resistance. This not only protects the contact force springs, but also reduces stress on the bearing gaps of the selector shaft due to the arc gases and the gas passage to the adjacent phase. As a result, a relatively coarse tolerance can be provided on the bearings of the switch shaft between adjacent current paths of a switch, which makes it easier to produce a one-piece switch shaft for multi-pole switches.
  • Fig. 1 shows a contact arrangement according to the invention in a longitudinal section.
  • FIG. 2 is a partially sectioned top view of a three-pole switch with adjacent current paths corresponding to FIG. 1.
  • FIG. 3 A contact arrangement without current loops is shown in simplified form in FIG. 3.
  • the contact arrangement shown in FIG. 1 is arranged in a chamber of a housing 1.
  • This housing consists of an insulating material and can be made in one or more parts.
  • the housing 1 is shown in its outline in FIG. 1, the further components belonging to a low-voltage circuit breaker, such as a drive device, a switch lock, trigger and connecting devices, not being shown, since they are known per se and not in the present context need explanation. Only the main current path of a pole of a circuit breaker is shown, which extends from a first connecting bar 2 via a schematically indicated trip block 3 to a first fixed contact piece 4, from there via a rotatably mounted contact lever 5 to a further fixed contact piece 6 and a connecting bar 7 .
  • the contact lever 5 is provided at its opposite ends with a contact piece 10 and 11, respectively, which cooperate with the fixed contact pieces 4 and 6.
  • the switching pieces 10 and 11 of the contact lever 5 are arranged on opposite sides of the longitudinal axis 12 of the contact lever. By rotating the contact lever 5 counterclockwise, the switching pieces 10 and 11 can be separated from the fixed switching pieces 4 and 6 at the same time.
  • a bearing bolt 13 which is arranged in the housing 1 in a fixed manner or is made of insulating material, is used in connection with a central elongated hole 14 of the contact lever 5. While the dimension of the elongated hole 14 in the direction of the longitudinal axis 12 with a usual tolerance of the diameter of the bearing bolt 13 corresponds, the contact lever 5 can move transversely to its longitudinal axis 12 on the bearing pin 13 because the longitudinal axis 15 of the elongated hole 14 is also perpendicular to the longitudinal axis 12 of the contact lever.
  • the contact forces occurring between the switching pieces 4 and 10 or 6 and 11 are thus independent of the mounting of the contact lever 5 and are based only on the action of contact force springs 47 and 48, the arrangement of which will be explained with reference to FIG. 2.
  • the contact lever 5 has two stop surfaces 16 and 17 arranged opposite one another with respect to the bearing axis. These are provided for cooperation with drivers 20 and 21, which are part of a switching shaft 22 made of insulating material and rotatable about the bearing pin 13.
  • the stop surfaces 16 and 17 lie on the longitudinal axis 15 of the elongated hole 14. A displacement caused by the alignment of the contact lever 5 on the bearing pin 13 therefore has no influence on the interaction between the stop surfaces 16 and 17 and the drivers 20 and 21.
  • the drivers 20 and 21 are lifted from the stop surfaces 16 and 17, so that apart from a bearing friction between the bearing pin 13 and the elongated hole 14, only the contact force springs are effective.
  • the contact lever 5 can rotate under the influence of current forces in the unchanged position of the control shaft 22.
  • the central area of the contact lever 5 overlapped by the drivers 20 and 21 is also provided with circular sections 34 and 35. In a known manner can be ensured by a not shown latching that the contact lever 5 is held in its electrodynamically open position until the switching lock is released.
  • the housing 1 is divided in the area of the contact arrangement shown by wall parts in such a way that a first arc chamber 23 and a second arc chamber 24 and a central pocket 25 are formed.
  • the middle pocket 25 is provided for receiving the control shaft 22 and the contact force springs, as will be explained.
  • the wall parts of the pocket 25 delimit slots 27 and 28 for the passage of the legs 8 and 9 of the contact lever 5.
  • Parts 30 and 31 in the form of a circular arc are located near the center of the contact lever 5 with a small distance from edges 32 and 33 which define the slots 27 and limit 28. These points are located on the side of the legs 8 and 9 of the contact lever 5, which are on the side of the switching pieces 10 and 11.
  • the housing 1 is provided with adjacent rooms for receiving three parallel current paths according to FIG. 1.
  • the bearing pin 13 extends over all current paths as well as the control shaft 22, which is rotatable about the bearing pin 13.
  • the switching shaft is designed such that it encloses the partitions to form a labyrinth gap.
  • FIG. 2 shows that the slots 27 and 28 between the wall parts of the pockets 25 are dimensioned so that the contact lever can be rotated freely.
  • the slots are so wide that legs 45 and 46 of contact force springs 47 and 48 designed as torsion springs also have space next to the legs 8 and 9 of the contact levers 5.
  • the legs 45 and 46 can be shortened compared to the example shown, that they rest on the legs 8 and 9 within the pocket 25 in order to be able to adapt the width of the slots more closely to the thickness of the legs 8 and 9. This is shown in the area of the middle current path 43, where the narrower slots are designated 57 and 58.
  • the torsion springs 47 and 48 each have a further leg 50 and 51, which is supported on the control shaft 22. Due to the symmetrical arrangement of two contact force springs for each contact lever, one-sided stress is avoided and the contact forces are equal.
  • Fig. 2 is indicated schematically that the switching shaft 22 is connected at one end to a drive device having a switch lock 52 and a manual actuator 53 (Fig. 1). Furthermore, the switch lock 52 is connected to triggers, for which an overcurrent release 54, a short-circuit release 55 and an undervoltage release 56 are given as examples.
  • the low voltage circuit breaker described above operates with a high current limit. This property is based on the loop-shaped supply leads to the fixed contact pieces 4 and 6. This arrangement causes the legs 8 and 9 of the contact lever 5 to be spaced a short distance from the conductor rails carrying the contact pieces 4 and 6, so that high currents on the contact lever 5 exert a torque acting in the opening direction. Under the influence of this torque, the contact lever 5 assumes the position shown in broken lines in FIG. 1. In a known manner, this prevents the short-circuit current from reaching its full height. Immediately after the dynamic contact opening, the release of the switch lock 52 (FIG. 2) follows, since the short-circuit current also acts on the trigger 55.
  • the low-voltage circuit breaker described also has a current-limiting property if the power supply is not loop-shaped in the manner shown, because current-dependent contact-lifting forces also occur between the switching elements themselves and, as a result of the double-contact arrangement, these forces are stronger than with single-contact arrangements Effects come.
  • An example of this is shown in simplified form in FIG. 3.
  • the connecting rails shortened compared to FIG. 1 are designated there by 60 and 61.
  • the desired amount of current limitation can thus be influenced by the configuration of the power supply to the fixed contact pieces 4 and 6.

Landscapes

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

Claims (9)

1. Dispositif de contact pour disjoncteur basse tension, en particulier pour disjoncteur à limitation de courant, comprenant un levier de contact (5) mobile autour d'un agencement de montage central (13, 14), qui est pourvu d'une pièce de contact (10, 11) à chacune de ses extrémités, sur des côtés opposés d'un axe longitudinal (12) qui croise l'axe de rotation dudit agencement, avec association d'un ressort (47, 48) générateur de force de contact à chacun des bras (8, 9) de ce levier, caractérisé en ce que :
a) le montage du levier de contact (5) présente un axe support (13) et un trou oblong (14) entourant cet axe et dont l'axe longitudinal (15) est à peu près perpendiculaire à l'axe longitudinal (12) du levier de contact et
b) le levier de contact (5) possède au moins une surface de butée (16) s'étendant à peu près à angle droit par rapport à son axe longitudinal (12), pour un entraîneur (20) mobile autour de l'axe de rotation et agissant dans le sens de la coupure sur le levier de contact.
2. Dispositif selon la revendication 1, caractérisé en ce que l'axe de support (13) est monté fixe et le trou oblong (14) est formé dans le levier de contact (5).
3. Dispositif selon la revendication 1, caractérisé en ce que le levier de contact (5) possède deux surfaces de butée (16, 17) disposées symétriquement de part et d'autre de son centre et que deux entraîneurs (20, 21) sont prévus.
4. Dispositif selon la revendication 1 ou 3, caractérisé en ce que l'entraîneur (20) ou les entraîneurs (20, 21) est disposé ou sont disposés, par rapport au levier de contact (5), de manière à définir une course libre, si bien que le levier de contact (5) peut prendre une position d'ouverture sans que la position de l'entraîneur (20) ou des entraîneurs (20, 21) change.
5. Dispositif selon la revendication 1 ou 3, caractérisé en ce que les entraîneurs (20, 21) font . partie d'un arbre de commande (22) monté rotatif autour de l'axe support (13).
6. Dispositif selon la revendication 1, caractérisé en ce que le ressort fournissant la force de contact est réalisé comme un ressort de torsion (47, 48) qui entoure l'axe support (13), dont une branche (51) est appuyée sur une surface antagoniste de l'arbre de commande (22) et dont l'autre branche (45) est appuyée sur le levier de contact (5).
7. Dispositif selon la revendication 6, caractérisé en ce que les deux ressorts de torsion (46, 47) sont reçus, des deux côtés du levier de contact (5), dans une poche (25) d'un boîtier (1) portant le dispositif de contact, et que les éléments de paroi de la poche (25) délimitent des fentes (27, 28) pour le passage de branches (8, 9) du levier de contact (5).
8. Dispositif selon la revendication 7, caractérisé en ce que les ressorts de torsion (47, 48) attaquent, par l'une de leurs extrémités, des parties du levier de contact (5) situées à l'intérieur de la poche (25).
9. Dispositif selon la revendication 7, caractérisé en ce que le levier de contact (5) est pourvu, près de son centre, de segments (30, 31) en arc de cercle situés du côté des pièces de contact (10, 11).
EP85730104A 1984-08-23 1985-08-07 Dispositif de contact pour disjoncteur basse tension avec un levier de contact à deux bras Expired EP0174904B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3431288 1984-08-23
DE19843431288 DE3431288A1 (de) 1984-08-23 1984-08-23 Kontaktanordnung fuer niederspannungs-leistungsschalter mit einem zweiarmigen kontakthebel

Publications (2)

Publication Number Publication Date
EP0174904A1 EP0174904A1 (fr) 1986-03-19
EP0174904B1 true EP0174904B1 (fr) 1988-05-04

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ID=6243865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85730104A Expired EP0174904B1 (fr) 1984-08-23 1985-08-07 Dispositif de contact pour disjoncteur basse tension avec un levier de contact à deux bras

Country Status (6)

Country Link
US (1) US4649247A (fr)
EP (1) EP0174904B1 (fr)
JP (1) JPH0610947B2 (fr)
CA (1) CA1258283A (fr)
DE (2) DE3431288A1 (fr)
MX (1) MX160683A (fr)

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Also Published As

Publication number Publication date
DE3431288A1 (de) 1986-03-06
JPH0610947B2 (ja) 1994-02-09
US4649247A (en) 1987-03-10
MX160683A (es) 1990-04-09
EP0174904A1 (fr) 1986-03-19
JPS6161319A (ja) 1986-03-29
CA1258283A (fr) 1989-08-08
DE3562537D1 (en) 1988-06-09

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