WO2016165877A1

WO2016165877A1 - Electrical switching device having a two-track cam

Info

Publication number: WO2016165877A1
Application number: PCT/EP2016/054856
Authority: WO
Inventors: Eric Durhône; Jérémy Garampon
Original assignee: Siemens Aktiengesellschaft
Priority date: 2015-04-15
Filing date: 2016-03-08
Publication date: 2016-10-20
Also published as: CN107533932A; EP3082144A1; CN107533932B; EP3082144B1; HRP20171782T1

Abstract

The present invention describes an electrical switching device, including: a supporting base (1) including a swivel pin (2) about which a cam (3) swivels; a first drive arm (4) having one drive end coupled to the cam in order to swivel said cam relative to the base about the swivel pin; a second arm (5) for electrical switching by linear driving along an axis of said arm; said second arm having: a) a first end provided with a male electrical connector (6) intended for being inserted into or removed from a female electrical connector (7) and; b) a second end driven by swivelling the cam by means of a sliding coupling, said coupling including a first slide (8) secured to the second end of the second arm and sliding in a first curved track (9) of the cam; and the drive end of the first drive arm of the cam forms a sliding coupling means, said coupling including a second slide (10) secured to said end of the first arm and sliding in a second track (11) of the cam. Said device is characterised in that the second track (11) includes a linear track portion having a main axis (12) passing through the swivel point of the cam.

Description

Electrical switching device to bi-track cam The present invention relates to an electric switching device for bi-cam track according to the preamble of revendi ^¬ cation 1.

In circuit breaker or disconnector installations, particularly at high voltage, for example as GIS (gas insulted switchgear) or AIS (air insulated switchgear) type metal enclosures, it is intended to be able to connect, but especially to disconnecting elements con nection ^¬ electric, such as a male electrical connector dedicated to be inserted into or removed from an electrical connector fe ^¬ mal. As such, there is provided an electrical switching device adapted to connect or disconnect said connectors mechanically. Particularly disconnection mode, it is required to achieve a fast and reliable opening between the connec tor ^¬ male and the female connector. As such, an example of a known switching device is given through the fi ^¬ Figures 1, 2 and 3.

Figure 1: electrical switching device cam track mono ^¬ closed connection mode,

Figure 2: single-circuit electric cam switching device in intermediate disconnection mode,

Figure 3: electrical switch device mono-track cam ^¬ in final disconnection mode. Figure 1 thus has a ^¬ elec tric switching device comprising:

a support base (1) comprising a pivot axis (2) around which a cam (3) pivots,

a first drive arm (4) having a drive end coupled to the cam for pivoting relative to the base about the pivot axis,

- a second arm (5) for electrical switching Workoutvia finely ^¬ linear along an axis of said arm,

- said second arm having:

a) a first end provided with a male electrical connector (6) dedicated to be inserted into or removed from a female electrical connector (7) and;

b) a second end driven by pivot of the cam by means of a sliding coupling, said coupling compre ^¬ ing a first slide (8) integral with the second ex ^¬ Tremite the second arm and sliding in a first arcuate track ( 9) of the cam,

- The driving end of the first drive arm of the cam is formed by a rotating coupling means ponc ^¬ tual (3 ') separate from the pivot axis (2) in order to exercise a moment (Mo) on said end and therefore to rotate the cam.

This electrical switching device mono-track cam is here closed connection mode, that is to say, the electric connec tor ^¬ male (6) is inserted into the electric connector female ^¬ stick (7). In other words, the female connector (7) is in the position closest to the base (1). Sa ^¬ singing that this input guide is coupled to the other end of the first drive arm (4) of the cam, the one-off rotating range ^¬ range means (3 ') is located far from said input guide or the female connector (7), while conversely the first slider (8) is located closer to said input guide or the female connector (7). Therefore, the male connector (6) coupled to the second arm (5) itself coupled to the first slider (8) is in the darkest position ^¬ in said input guide or the female connector (7). Said first slider (8) is thus ini ^¬ tive position on a first end of the curvilinear track (9).

Figure 2 shows according to Figure 1 the same device commu ^¬ tation electric mono-track cam, however, die ^¬ intermediate connection mode, that is to say when the time (Mo) exerted by the drive end first arm

drive (4) of the cam (3) is in an inter ^¬ valley peak value and thus enables the pivo cam ^¬ ter under high drive torque, while the drive force (Fd ) parallel to the axis of the male connector is ensured by the withdrawal of the female connector (7) further away from the fixed base (1) with respect to Figure 1. the RESUL force as ^¬ (Fr) in the main direction of the first drive arm (4) on the cam (3) is reduced to about 15% of the drive force (Fd) - (Fr = 85% x Fd) - pa ^¬ to the axis of the connector male. For the sake of clarity in this document, friction efforts are not considered. In this intermediate disconnection mode, it is also expected that the male connector (6) will disengage from the female connector (7) thus creating an arc-contact break which will commonly be blown off by an inlet of neutral gas or SF6 during the continuation of the decon ^¬ nexion. Also, the first slide (8) slides in the track (9), the hook-shaped curvilinear geometry or "L" rounding is adapted to minimize fric efforts ^¬ tions of the slide with the edges of said track.

Figure 3 shows according to Figure 2 the same device commu ^¬ tation electric mono-track cam, however, die mode ^¬ final connection for a total mechanical and electrical separation of the male and female connectors (6, 7). The moment (Mo) exerted by the driving end of the first arm The drive (4) of the cam (3) thus returns to an in ^{¬ range} of minimum values. Similarly, the first slider (8) reaches its final position at a second end of the curvilinear track (9).

Considering Figures 1 to 3 in reverse order, it would then be easy to understand the opposite process of

(re) connection of the male and female connectors. It should also be noted that the curvilinear geometry (hook or "L" rounded) of the first track (9) is disposed on a major half of the cam (3) and whose first end ^¬ mity (slide position in Figure 1) is further away from the pivot axis (2) than the second end (slide position in Figure 3). This geometry allows a withdrawal track acceleration of the male connector (6) relative to the female connector (7) in the disconnection mode interme diary ^¬ (Figure 2). This acceleration makes it possible to reduce the duration of cut or blowing of the arc. As such, reference is made to a published patent-type document FR2817389A which was filed on 30.11.2000 by a company now affiliated with the present applicant. Mainly, this publica ^¬ tion presents by means of Figures 1 to 6 and descrip ^{¬ tion} a switching device similar to Figures 1 to 3 previously described above. Finally, the publication includes a 7 comprising a similar device having this ^¬ for a two-track cam, both geometry curvi ^¬ line, instead of a single-track cam curvilinear geometry. More specifically and by reference, Figure 7 of

FR2817389A is reproduced in the present invention in fi ^¬ Figure 4 and comprises an electric switching device (120) comprising:

- a support base comprising a pivot axis (see cross) around which pivots a cam (184), a first drive arm (186) having a drive end coupled to the cam for pivoting relative to the hub about the pivot axis;

a second arm (80) for electrical switching via linear drive along an axis of said arm;

said second arm (80) having:

a) a first end provided with a male electrical connector dedicated to be inserted into or removed from a female electric connector ^¬ and stick;

b) a second end driven by pivot of the cam by means of a sliding coupling, said coupling compre ^¬ ing a first slider (190a) integral with the second end of the second arm and sliding in a first curved track (192a) of the cam,

the drive end of the first arm (186)

of the cam driving form a coupling means by neck ^¬ smoothening, said coupling comprising a second slider (190b) integral with said end of the first arm and neck ^¬ smoothing in a second track (192b) of the cam.

This alternative bi-track described according to FR2817389A p. 22, 1. 18-31 and FIG. 7 makes it possible to achieve cutting speeds (accelerations ^¬ rations) identical to those of FIGS. 1 to 5 of FR2817389A and therefore without any kinetic advantage with respect to the figures described 1 to 3 in the present document comprising a mono-track cam. From a more precise study of the sliding of the sliders, it also appears that lateral force distributions of the sliders on the edges of their respective track create undesirable friction effects.

An object of the present invention is to provide an effective electrical switching device allowing a speed of disconnection of the male and female connectors faster, in particular for a high voltage application such as a disc. circuit breaker or disconnector under GIS type metal casing station.

From an electrical switching device as described in Figures 1 to 3 and comprising a dual-track cam as provided in Figure 4, it is thus proposed an electrical switching device according to the features of claim 1. This same device is also described in an embodiment and advantageous application provided using the figures described:

Figure 5: electric switching device with dual-track cam in closed connection mode, Figure 6: electrical switching device with twin-track cam in intermediate disconnection mode,

Figure 7: two-way cam electric switching device in final disconnection mode,

Figure 8: Diagram of arm movement speed of said device.

A set of subclaims also has advantages of the invention.

Figure 5 shows as an elec tric ^¬ switching device comprising:

a support base (1) comprising a pivot axis (2) around which a cam (3) pivots,

a second arm (5) for electrical switching by linear drive along an axis of said arm; - said second arm having:

the drive end of the first drive arm of the cam forms a sliding coupling means, said coupling comprising a second slide (10) secured to said end of the first arm and sliding in a second race (11). of the cam.

The said device is further characterized in that the second track (11) comprises a linear track portion having a main axis (12) passing through the pivot point (2) of the cam.

The electric bi-track cam switching device according to FIG. 5 is here in connection mode closed analogously to FIG. 1, that is to say that the male electrical connector (6) is inserted into the female electrical connector (7). ). The second slide (10) is located at one end of the deu ^¬ xth path (11) furthest from the pivot point (2). The first slider (8) is also at one end of the first track (9) furthest from the pivot point (2). During a next disconnection mode (intermediate, then final) according to the following figures 6 and 7, the first track has a curved geometric profile (and then linear) so that for a range of positions of the first neck ^¬ on this profile in association with a range of positions of the second slider in the second track, an linear flow of the second arm undergoes an acceleration which is here a considerable advantage also presented in Figure 8. Figure 6 shows the electrical switching device according to Figure 5, however in intermediate disconnected ^¬ diode mode, analogous to the intermediate disconnection mode of Figure 2. The male connector (6) disengages from the female con ^¬ receptacle (7) thereby creating an arc contact break that will commonly be blown by a neutral gas inlet or SF6 during the subsequent disconnection.

Here, the second slide (10) is another Extremists ^¬ moth second track (11) closest to the point of pi- vot (2). The first slide (8) has then traveled more than 30% on the first track (9) towards the other Extremists ^¬ moth the first track (9) closest to the point pi vot ^¬ (2). The driving force (Fd) parallel to the axis of the male connector (6) is ensured by the withdrawal of the female connector (7) further from the fixed base (1) with respect to FIG. resultant force (Fr) according to the main direction - here also advantageously parallel to the axis of the male connector - of the first driving arm (4) on the cam (3) is thus equal to 100% of the driving force (Fd) parallel to the axis of the male connector. The first arm is thus coupled to a mechan ^¬ mechanism for moving said arm in a direction l ^¬ neaire identical to that of the axis of said first arm, free of rotation relative to the support base. The first and second elongate arms form parallel movements along their axes for any position of their respective neck ^¬ with one of the tracks of the cam. Even if this configuration of "parallel" transmission of effort is optimal because allows a complete transmission of said efforts, a rotation of the first arm can however be ^{¬ ¬} lerate.

For the sake of clarity in this document, friction efforts are still not considered. Also, the pre ^¬ Mier slide (8) slides in the track (9) whose GEOME ^¬ sorts curvilinear hook-shaped or "L" rounding is adapted to minimize friction of the slider efforts with the edges of said track.

At the simplest, the device according to the invention thus provides that the second track is a linear oblong opening. It should be noted that the first and second tracks describe a question mark (?) Whose lower point, similar to the second track, is oblong.

This geometry of the tracks makes it possible to provide a accé ^¬ lération the first slide (8) in order to remove more quickly the male connector (6) fe connector inlet guide ^¬ mal (7).

Finally, an inlet guide in the form of a nozzle (7 ') driven by the first arm (4) and the cam in the disconnection mode enables the male connector (6) of the female connector to be slidably withdrawn in said nozzle ( 7), said nozzle (7 ') being movable relative to the support base (1).

Figure 7 shows the electrical switching device according to Figure 5 or 6, however in final disconnection mode, analogous to the final disconnection mode of Figure 3. The male connector (6) is completely disengaged from the female connector (7).

Here, the second slider (10) is again at the initial end of the second track (11) furthest away from the pivot point (2). The first slide (8) then traveled the entire first track (9) towards the other end of the first track (9) closest to the pivot point (2). Figure 8 shows an example of velocity diagram ^¬ placement of first and second arms of said device, to illustrate the advantageous effect of acceleration described above. The curves represented are a value (%) of displacement (Di) as a function of a time unit (Tu) between 0 and 1. A first curve (DS) thus indicates the constant speed of withdrawal of the first arm (4) ( when removing the guide

input 7). A second curve (SC) indicates the driving speed of the male connector (6) for a device se ^¬ lon one of Figures 1 to 3 (or 4): it can be seen that in the time interval [0.2 ; 0.7], said withdrawal speed of the second arm or of the male connector (6) is equal (and opposite) to that of the withdrawal of the first arm (4). Finally, a third curve (DC) indicates the speed for driving the male connector (6) for a device according to one of fi ^¬ Figures 5 to 7 it can be seen there that, in the interval (HS) of time [0 , 31; 0.46], said withdrawal speed deu ^¬ xth arm or male connector (6) is increased (and oppo- AL) compared to (HC) removal of the first arm (4), there is in effect an acceleration of a factor 1.5 on this interval (HS) at high speed, which illustrates the effect desired by the device according to the invention, in order to make the disconnection faster and therefore the arc break more efficient.

Claims

claims

Electrical switching device comprising:

a support base (1) comprising a pivot axis (2) around which a cam (3) pivots,

- a first arm (4) drive having a drive end coupled to the cam to make pivo ^¬ ter with respect to the base about the axis of pivot,

- a second arm (5) for electrical switching in ^¬ linear dragging along an axis of said arm,

- said second arm having:

a) a first end provided with a male electric connector ^¬ stick (6) dedicated to be inserted into or removed from a female electrical connector (7) and;

b) a second end driven by pivoting the cam by means of a sliding coupling, said coupling comprising a first slide (8) integral with the second end of the second arm and sliding in a first curvilinear track (9) of the cam,

- the drive end of the first arm

driving the cam forms a sliding coupling means, said coupling comprising a second slider (10) integral with said end of the first arm and slidable in a second track (11) of the cam,

characterized in that

the second track (11) comprises a li ^¬ néaire track portion having a major axis (12) passing through the pivot point of the cam.

Device according to claim 1, wherein in the disconnect mode, the first track has a geometric profile curved sliding and linear so that for an interval of positions of the first slide in asso ciation ^¬ a position interval of the second coulis- bucket in the second track, a linear drive of the second arm undergoes acceleration.

Device according to one of claims 1 to 2, for the ^¬ which the first arm is coupled to a mechanism of displa ^¬ cement said arm in a linear direction identical to that of the axis of said first arm, free of rotation relative to the support base.

Device according to one of claims 1 to 3, for the ^¬ which the first and the second elongate arm form parallel movements along their axes for any position of their respective slider with one of the tracks of the cam.

Device according to one of claims 1 to 4, for the ^¬ which the second track is an oblong opening li ^¬ neaire.

Device according to one of claims 1 to 5, for the ^¬ which the first and the second tracks describe a form question mark (?) Whose lower point ^¬ is oblong.