FR2794279A1 - CONTROL OF A MULTIPOLES CIRCUIT BREAKER HAVING A DISTANCE BETWEEN VARIABLE POLES - Google Patents

Abstract

The control for a multi-pole power switch, in particular a vacuum switch for medium voltage, comprises a rotary control shaft (1) on which several cams (3) associated respectively with the poles (9) of the switch are mounted. , each cam being coupled to the movable contact of the associated pole by means of an oscillating lever (6) coupled to the cam by a connecting rod (4) and to the movable contact of the pole by a pusher (8) such that a rotary movement of the cams is transformed into a translational movement of the movable contacts of the poles. The connecting rods are coupled to the oscillating levers via a common crossmember (5) which makes it possible to provide a distance between adjacent poles different from the distance between adjacent cams on the control shaft.

Description

The invention relates to a control for a power switch with

  several poles, in particular a vacuum switch for medium voltage, comprising a rotary control shaft on which are mounted several cams associated respectively with the poles of the switch, each cam being coupled to the movable contact of the associated pole via an oscillating lever coupled to the cam by a connecting rod and to the movable contact of the pole by a pusher so that a rotary movement of the cams is transformed into a

  translational movement of the movable pole contacts.

  Such an order is already known from the patent document EP-

  0385265. This command for a three-pole circuit breaker has a construction such that the distance separating two adjacent poles from the switch must be repeated identically for the distance separating two adjacent cams on the shaft

control.

  The object of the invention is to propose another construction of this control making it possible to overcome the need to provide the same distance between adjacent cams and between adjacent poles. More particularly, an object of the invention is to make it possible to control different multipole switches having different distances between adjacent poles without it being necessary to modify the distance between adjacent cams of a

control of these switches.

  To this end, the invention relates to a control as defined above, characterized in that the connecting rods are coupled to the oscillating levers by

  through a common cross.

  With this construction of the control, the oscillating levers can be coupled to the poles regardless of the distance between adjacent cams along the control shaft. This command can therefore be used for distances between different adjacent poles without intervention on the shaft

control.

  An exemplary embodiment of the control according to the invention is described below.

  after in detail and illustrated in the single figure which shows this control of

  very schematically according to a perspective view.

  In the figure, the control of a three-phase circuit breaker having three vacuum interrupters 9 comprises a main control shaft 1 whose rotation is ensured by a spiral spring (not shown). The main tree 1

  extends parallel to the alignment of the three vacuum interrupters 9 of the circuit breaker.

2 2794279

  Three cam devices 3 associated respectively with the three vacuum ampoules 9 are mounted on the control shaft 1 while being spaced from each other by a certain fixed distance. The shaft 1 and the three cam devices 3 are

  move in a rotary motion.

  As explained in more detail in document EP-0385265, the coil spring housed in the spring cage 2 is banded by means of a

  manual or motorized winding mechanism not shown.

  The three cam devices 3 are coupled to the movable contacts (not shown) of the three empty bulbs 9 by means of three oscillating levers 6 each coupled to a cam device 3 by a connecting rod 4 and to the movable contact of the bulb vacuum associated with a compression bar or pusher 8 which means that a rotary movement of the cams 3 is transformed into a

  translational movement of the movable contacts of the vacuum interrupters 9.

  As visible in the figure, the connecting rods 4 are coupled to the oscillating levers 6 by means of a common cross-member 5 which extends

  parallel to the control shaft 1.

  By the rotary movement of the three cam devices 3, a lifting movement moves the three connecting rods 4 as in the order of the document indicated above. This lifting movement is transmitted to the cross member 5. At the cross member, the three connecting rods 4 are fixed to the cross member 5 with a fixed distance A between adjacent connecting rods. On the other hand, the three oscillating levers 6 are fixed on the cross-member 5 at a distance A, B, C between adjacent levers

  corresponding to the distance A, B, C between adjacent poles of the circuit breaker.

  The movement of the cross-member 5 is transmitted to the oscillating levers 6 mounted pivoting about an axis 7 parallel to the shaft 1. The axis 7 can be common to the different levers 6. This movement of the oscillating levers 6 is transmitted to the movable contacts empty ampoules 9 via the pushers 8

  as described in document EP-0385265.

  With this interface crossmember 5, it is therefore possible to design a control whose location of the cam devices on the main control shaft

  is no longer linked to the distance between adjacent poles of the circuit breaker to be controlled.

3 2794279

Claims (1)

CLAIM   Control for a power switch with several poles, in particular a vacuum switch for medium voltage, comprising a rotary control shaft (1) on which are mounted several cams (3) associated respectively with the poles (9) of the switch, each cable being coupled to the movable contact of the associated pole by means of an oscillating lever (6) coupled to the cam by a connecting rod (4) and to the movable contact of the pole by a pusher (8) so that a rotary movement of the cams is transformed into a translational movement of the movable contacts of the poles, characterized in that the connecting rods are coupled to the oscillating levers by means of a common crosspiece (5).