RU2804047C2 - Control device for vacuum chamber contacts of electric switching device - Google Patents

Abstract

FIELD: switching device.

SUBSTANCE: invention is related to a control device (10) for the movable contact (91) relative to the fixed contact of the vacuum chamber (90) of the electrical switching device (100). Device (10) contains the main mechanism (1, 2, 3, 4) for disconnecting and connecting the contacts, which is of the mechanical energy storage type. According to the invention, this device (10) comprises an auxiliary mechanism (5, 6, 7, 8) to help disconnect, configured to store mechanical energy when the moving contact (91) moves towards the connection position, and return the mechanical energy thus stored, in such a way as to exert an additional releasing force in form of an impact, leading to movement of the moving contact (91) from the connection position towards the release position, when the moving contact (91) is immobilized in the connection position, despite the action of the main releasing force. This additional releasing force can in particular be transmitted by means of an impact arm (6) caused to rotate by the action of an auxiliary release spring (5) until one of its ends strikes the main mechanism lever (41) or a component connected to with this lever (41).

EFFECT: ensuring the opening of contacts in case of their welding.

9 cl, 8 dwg

Description

Field of technology

The invention relates to the field of electrical switching devices, in particular, devices for switching electric current in a vacuum. The invention relates, in particular, to devices such as a high-voltage circuit breaker. However, it is not limited to this type of device and may also apply to devices such as contactors or switches. Moreover, the invention has applications in various voltage ranges, in particular medium voltage or high voltage, i.e., a device operating at voltages above 1000 V. As used herein, the expression "electrical switching device" covers, without distinction, many types electrical devices such as a switch, circuit breaker, contactor, fuse switch, circuit breaker, and the like.

More particularly, the invention relates to a control device for the vacuum chamber contacts of such an electrical switching device.

Prior Art

Control devices for a moving contact of a vacuum chamber, capable of separating the moving contact from a corresponding fixed contact by means of an energy-storing release mechanism, are known in the prior art.

Fig. 1 and 2 show a traditional control device. The release mechanism of this device includes a release spring 3 and a contact pressure spring 14 calibrated to distance the movable contact 91 from the fixed contact 92 upon receipt of a release command, according to the sequence illustrated in FIG. 1 and 2. FIG. 1 shows the movable contact 91 in the disconnecting position, while FIG. 2 shows the movable contact 91 in the connection position.

When connecting, under load, contacts 91 and 92, the latter may be welded to each other under conditions of some extreme current and/or voltage, so that the energy accumulated through the release spring 3 and through the contact pressure spring 14 may not be sufficient to separate the contacts from each other.

The object of the invention is to enable the separation of such contacts when they are welded to each other and the energy stored in the springs is insufficient to break the welded connection between them.

Disclosure of the Invention

To this end, the subject of the invention is a control device for a movable contact relative to a fixed contact of at least one vacuum chamber for an electrical switching device, between a connection position in which the movable contact abuts the fixed contact and a disconnection position in which the movable contact is abutted distance from the fixed contact. This device contains a main disconnecting and connecting mechanism configured to:

- move the movable contact towards the connection position when the device receives a connection command, and accumulate mechanical energy when the movable contact moves towards the connection position,

- return the mechanical energy thus accumulated in such a way as to exert a major release force leading to movement of the movable contact from the connection position towards the release position when the device receives the release command.

According to the invention, this device comprises an auxiliary release assist mechanism configured to:

- accumulate mechanical energy when the moving contact moves towards the connection position,

- return the mechanical energy thus accumulated in such a way as to exert an additional separating force leading to movement of the movable contact from the connection position towards the disengagement position, when the movable contact is immobilized in the connection position, despite the action of the main separating force, in other words, when this main release force is insufficient to move the movable contact from the connection position towards the release position.

The auxiliary mechanism thus constitutes a second energy storage mechanism to assist in breaking the welded joint between the contacts when the mechanical energy stored through the main release mechanism is insufficient to separate the contacts from each other.

In one embodiment, said main mechanism may comprise an entraining element to which a movable contact is connected, a release spring, preferably a compression spring, adapted to store and return said intrinsic mechanical energy to the main mechanism, the release spring being configured to exert said main release force on the entrainer element so as to move the movable contact towards the release position when the device receives said release command, it is possible for the main mechanism to further comprise a control shaft and a main transmission system connecting the control shaft to the entraining element. According to this embodiment, the device may be configured to:

- release the rotation of the control shaft when the device receives said release command,

- drag the control shaft into rotation in the direction of connection, when the device receives said connection command, such rotation of the control shaft moves the movable contact towards the connection position by means of the entraining element, so that the release spring accumulates said mechanical energy,

- immobilize the rotation of the control shaft when the moving contact is in the connection position.

Preferably, the entrainment element may comprise a pole shaft, the entrainment element forms a first lever rotatably integral with the pole shaft, and the control shaft may be provided with a second lever rotationally integral with the control shaft, said main transmission system comprising a connecting rod for connections connected to the first and second levers.

In one embodiment, the auxiliary release assist mechanism comprises an auxiliary release spring, preferably an extension spring, which auxiliary release spring is adapted to store and return said self-mechanical energy to the auxiliary mechanism. According to this embodiment, this auxiliary mechanism may further comprise an impact arm that can be moved in rotation about the stationary shaft, the auxiliary release spring is configured to exert said additional release force on the impact arm so as to entrain it in rotation about said stationary shaft, when the device receives said release command, the impact arm is configured to impart an additional release force to said entraining element in the form of a strike when the movable contact is immobilized in the strike position despite the action of the main release force.

Such an auxiliary mechanism is relatively simple to implement, and, through the action of moving the impact arm, makes it possible to exert an additional breaking force, in this case an impact, of such a nature as to break the welded joint between the contacts.

In addition, the distance between the fixed shaft and this part of the impact arm, which carries out the impact as such, that is, transmits an additional disconnecting force to the entraining element, constitutes an arm that makes it possible to use an auxiliary release spring of relatively low rigidity, in particular relative to the rigidity of the main release spring springs.

This makes it possible to decouple the auxiliary mechanism from the main mechanism when the main release force is sufficient to open the contacts, that is, in this case, to prevent the transfer of additional release force to the entraining element.

In one embodiment, the auxiliary mechanism may comprise an auxiliary transmission system, the auxiliary transmission system comprising a release coupling rod connecting the coupling rod for coupling to the second lever, and a release coupling rod connecting the impact arm to the second lever so as to couple the shaft control and impact shoulder in rotation. According to this embodiment, the auxiliary mechanism is preferably positioned such that when the device receives a release command and the movable contact is immobilized in the connection position despite the action of the main release force:

- the coupling rods for connection and release are moved in rotation relative to each other by the action of an auxiliary release spring reducing the distance between the end of the connecting rod for coupling connected to the first lever and the end of the coupling rod for release connected to the second lever,

- the impact arm is driven into rotation about said stationary shaft by the action of an auxiliary release spring until one of its ends strikes the first arm or component connected thereto, this impact imparting said additional release force to the entrainment element.

In one embodiment, the auxiliary mechanism may comprise a torsion spring configured to orient the direction of rotation of the release coupling rod relative to the coupling rod.

Preferably, the fixed shaft of the impact arm may be parallel to the rotation axes of the pole shaft and the control shaft.

Such an arrangement typically makes it possible to reduce the compactness of the device and simplify its operation.

The invention also relates to an electrical switching device comprising one or more vacuum chambers, each containing a movable contact and a fixed contact, this device comprising a device as defined above.

This electrical switching device may consist of a high voltage circuit breaker.

Additional advantages and features of the invention will become apparent upon reading the following non-limiting detailed description.

Brief description of drawings

The following detailed description makes reference to the accompanying drawings, in which:

Fig. 1 is a schematic view of a control device for a moving contact of a vacuum chamber of a prior art electrical switching device, in a position of disconnecting the moving contact;

Fig. 2 is a schematic view of the control device in FIG. 1, in the position of connecting the moving contact;

Fig. 3 is a partial schematic perspective view of an electrical switching device according to the invention, showing a control device for a movable contact of a vacuum chamber of the device;

Fig. 4 is a schematic view of a control device for the device of FIG. 3, in the moving contact connection position;

Fig. 5 is a schematic view of a control device for the device of FIG. 3, in the position of disconnecting the moving contact;

Fig. 6 is a schematic view of a control device for the device of FIG. 3, in an intermediate position in which the auxiliary mechanism of the device operates;

Fig. 7 is a schematic view of a control device for the device of FIG. 3, in a striking position to release the moving contact;

Fig. 8 is an enlargement of the control device for the device in FIG. 3, at the position in FIG. 7, centered on the release system for the striking mechanism of this device.

Detailed Description of Embodiments

Fig. 3 shows a portion of an electrical switching device 100, such as a high voltage circuit breaker, equipped with a vacuum chamber 90. This device 100 may typically comprise multiple vacuum chambers (a multi-chamber configuration not shown).

The invention relates more particularly to a control device 10 for a movable contact 91 of a vacuum chamber 90 relative to a stationary contact of this chamber 90. As can be inferred from the following description, this control device 10 is adapted to simultaneously instruct the release of a plurality of movable contacts 91 when the device 100 is equipped with a plurality of 90 vacuum chambers.

With reference to FIG. 3 and 4, the control device 10 includes a pole shaft 1 that can be moved in rotation about an axis A1 relative to the support member 101 of the device 100.

The pole shaft 1 carries, for each vacuum chamber 90, a bearing support 11, connected to the movable contact 91 of this chamber 90 by means of a rod 12, one end of which is attached to the bearing support 11, and the other end of which is attached to the movable contact 91.

This device 10 allows translational movement in the direction D1 of the rod 12 and the movable contact 91 relative to the corresponding fixed contact 92 when the pole shaft 1 moves in rotation about the axis A1. Specifically, when the pole shaft 1 moves in rotation about the axis A1 in the first rotation direction S11, the movable contact 91 moves in the direction D1 in the first translation direction S13 corresponding to the connection direction of the contacts 91 and 92 (see FIG. 4). When the pole shaft 1 moves in rotation about the axis A1 in the second rotation direction S12, the movable contact 91 moves in the direction D1 in the second translation direction S14 corresponding to the separation direction of the contacts 91 and 92.

Thus, when the device 100 includes a plurality of cameras 90 (configuration not shown), rotation of the pole shaft 1 makes it possible for the contacts 91 and 92 of each of the cameras 90 to be disconnected or connected simultaneously.

Basic mechanism of separation and connection

The control device 10 contains, for each vacuum chamber 90, a release spring 3, which, in this example, operates in compression. The spring 3 stretches around the rod 12 and abuts, on the one hand, against the bearing surface of the bearing support 11 (visible in Fig. 3) and, on the other hand, against the front surface of the corresponding bearing element 13 (visible in Fig. 4). This support element 13 is fixed relative to the fixed contact 92 of the corresponding chamber 90 and relative to the support element 101 of the device 100.

In order to maintain pressure between contacts 91 and 92, for each vacuum chamber 90, device 10 includes a contact pressure spring 14, which, in this example, operates in compression. The spring 14 also extends around the rod 12 and rests, on the one hand, on the said bearing surface of the bearing support 11 and, on the other hand, on the front surface of the corresponding bearing element 15 (visible in Fig. 4). This supporting element 15 is integral with the rod 12 in translational movement in the direction D1.

The pole shaft 1 is provided with a first lever 41 integral with the pole shaft 1 in rotation about the axis A1, so that rotation of one of these elements about the axis A1 drags the other of these elements into rotation about the axis A1 in the general direction (S11 or S12) of rotation . The first lever 41 forms a dragging element for the pole shaft 1.

The control device 10 further includes a control shaft 2 adapted to be driven, by means of a control mechanism (not shown), into rotation about a rotation axis A2 parallel to the rotation axis A1 of the pole shaft 1.

The control shaft 2 is provided with a second lever 42 integral with the control shaft 2 in rotation about the axis A2, so that rotation of one of these elements about the axis A2 drags the other of these elements into rotation about the axis A2 in the general direction (S21 or S22, see .below) rotation.

The first lever 41 and the second lever 42 are connected to each other by a double connecting rod formed by a connecting connecting rod 43 and a so-called "release" connecting rod 7, which will be described in more detail below in the part belonging to the auxiliary mechanism. The coupling rod 43 is coupled at one of its ends with the first lever 41 and at its other end with the release coupling rod 7. The release connecting rod 7 is articulated at one of its ends with the connecting rod 43 and at its other end with the second lever 42.

The double connecting rod as well as the second lever 42 form the main transmission system connecting the control shaft 2 with the entraining member 41 for the pole shaft 1.

The various components of the device 10 just described form a basic disconnecting and coupling mechanism that allows the movable contact 91 to move between a coupling position in which it abuts the stationary contact 92 and a release position in which it is spaced from the stationary contact 92 .

The connection position is shown in Fig. 4, and the disconnection position is shown in FIG. 5.

At the connection position, the release spring 3 and the contact pressure spring 14 are compressed and thus accumulate mechanical energy, exerting a major release force on the bearing surface of the bearing support 11, this force tends to drag the pole shaft 1 and the first lever 41 into rotation around the axis A1 in the said second rotation direction S12 (see FIG. 4). While the device 10 does not receive a release command, rotation of the control shaft 2 is prevented, so that the movable contact 91 is maintained in the connection position by the action of the release spring 3 and the contact pressure spring 14 and the connecting rods 43 and 7, which protect the lever 41 and the pole shaft 1 from rotation in said second rotation direction S12. Indeed, in this position, the connecting rods 43 and 7 are aligned in such a way that the distance, on the one hand, between the articulation of the connecting rod 43 with the first lever 41 and, on the other hand, the articulation of the connecting rod 7 with the second lever 42 cannot be increased.

Disconnection via main mechanism

In order to move from the connection position (FIG. 4) to the disconnect position (FIG. 5), the device 10 is configured to release rotation of the control shaft 2 when a disconnect command is issued.

This release command thus enables said main release force exerted by the release spring 3 and the contact pressure spring 14 to cause the pole shaft 1 and the first arm 41 to rotate about the axis A1 in the second rotation direction S12. This rotation drives the movable contact 91 into translational motion in the release direction S14. This rotation simultaneously drives the second lever 42 and the control shaft 2 into rotation in the release direction S22, through the connecting rods 43 and 7.

Naturally, the contact pressure spring 14 is sized such that its free length is such that, in the release position, the movable contact 91 is at a distance from the fixed contact 92 (see FIG. 5).

Connection via main mechanism

In order to move from the disconnecting position (FIG. 5) to the connecting position (FIG. 4), the device 10 is configured to rotate the control shaft 2 in the connecting direction S21 when a connecting command is issued.

Such rotation of the control shaft 2 drives the first lever 41 and the pole shaft 1 into rotation in the first rotation direction S11 by means of the connecting rods 43 and 7 and the second lever 42, which moves the movable contact 91 in translational motion in the disconnection direction S13.

When the contacts 91 and 92 are connected in this way, and when disconnected by the main mechanism (without assistance from the auxiliary mechanism; see below), the double connecting rod formed by the connecting rods 43 and 7 operates similarly to the single connecting rod.

When the contacts 91 and 92 are connected, i.e., when the pole shaft 1 is rotated between the configuration in FIG. 5 and the configuration in FIG. 4, the release spring 3 accumulates mechanical energy.

The principle of energy storage through the main mechanism

Variants of the basic mechanism for disconnecting and connecting may differ from the specific embodiment just described. For example, in an embodiment not shown, the release spring may be an extension spring.

More specifically, the main mechanism is arranged to move the movable contact 91 toward the connecting position when a connecting command is issued, and to store mechanical energy when it moves toward the connecting position. This main mechanism is further configured to return the mechanical energy thus stored in such a manner as to exert a main release force tending to move the movable contact 91 from the connection position towards the release position when the device 10 receives the release command.

Auxiliary release mechanism

According to the invention, the device 10 includes an auxiliary release assist mechanism provided to break the weld between contacts 91 and 92 when the main mechanism alone does not allow the weld between them to break.

With reference to FIG. 3 and 4, the auxiliary mechanism includes an impact arm 6, which can be moved in rotation about a stationary shaft 61.

This fixed shaft 61 is parallel to the rotation axes A1 and A2 of the pole shaft 1 and the control shaft 2, respectively.

The auxiliary mechanism contains a connecting rod 8 for disconnection connecting the impact arm 6 with the second lever 42 so as to connect the control shaft 2 in rotation with the impact arm 6. For this purpose, the connecting rod 8 for disconnection is articulated at one of its ends with the impact arm 6 , at the point of the shoulder 6, located between the fixed shaft 61 and the impact end of this shoulder 6; the disconnecting connecting rod 8 is articulated at the other of its ends with the second lever 42. Thus, rotation of the second lever 42 in the disconnecting direction S22 drives the impact arm 6 into rotation in the impact direction S32, and, conversely, rotation of the second lever 42 in the connection direction S21 drags the impact arm 6 of the lever into rotation in the cocking direction S31, and back (Fig. 4).

In this example, the auxiliary mechanism includes an auxiliary tension release spring 5. This spring 5 is connected on one side to the stationary part of the device 10, i.e., it is stationary relative to the support element 101 of the device 100, and, on the other hand, to the end of the impact arm 6, which is opposite, relative to the stationary shaft 61, to its impact end.

At the connection position shown in FIG. 4, the auxiliary release spring 5 is stretched and thus accumulates mechanical energy exerting a force on the impact arm 6 causing it to rotate around the stationary shaft 61 in the impact direction S32. Until the device 10 receives the release command, the rotation of the control shaft 2 is immobilized so that the impact arm 6 is unable to rotate in the impact direction S32, subject to the presence of the release connecting rod 8.

The disconnecting connecting rod 8 as well as the releasing connecting rod 7 form an auxiliary transmission system capable of entraining a blow through the impact arm 6 on the entraining element 41 when the movable contact 91 is immobilized in the connecting position despite the release of the rotation of the shaft 2 management, i.e. when the main release force is insufficient to open or break the weld between pins 91 and 92.

Assisting disconnection by means of an auxiliary mechanism

When the contacts 91 and 92 are welded to each other, the main mechanism may not be sufficient to open the contacts 91 and 92. In this case, the movable contact 91 is immobilized in the connection position illustrated in FIG. 4, despite the ability of the control shaft 2 to rotate around the axis A2 through the action of the release spring 3 and the contact pressure spring 14 (see above).

The result of this is that the first lever 41 is capable of rotating about the axis A1 in the second rotation direction S12 only by an angle corresponding to the compression of the contact pressure spring 14 due to the welding connection between the contacts 91 and 92, which resists the action of the release spring 3.

However, the action of the auxiliary release spring 5 on the impact arm 6 causes the second lever 42 to be driven into rotation about the axis A2 in the release direction S22 by the release connecting rod 8.

Subject to the presence of the release connecting rod 7, the second lever 42 and the impact arm 6 can each be rotated, respectively, about the axis A2 in the release direction S22 and about the stationary shaft 61 in the impact direction S32. In operation, the releasing connecting rod 7 and the connecting connecting rod 43 are adapted to rotate relative to each other through the action of the auxiliary release spring 5 and thus reducing the distance, on the one hand, between the joint of the connecting rod 43 and the first lever 41 and, on the other hand, by the articulation of the connecting rod 7 and the second lever 42, according to the configuration illustrated in FIG. 6. The release connecting rod 7 thus makes it possible to release the auxiliary mechanism so that it facilitates, through the impact it performs, the separation of the contacts 91 and 92.

For the purpose of orienting the direction of rotation of the release connecting rod 7 relative to the connecting rod 43, a torsion spring 71 can be installed between these connecting rods 7 and 43. This orientation function can be provided by any other means, for example, using a ratchet mechanism mounted on one of these connecting rods in such a way as to prevent their relative rotation in a direction incompatible with the operation of the device 10 (not shown).

In the configuration in FIG. 6, the impact arm 6 is then driven into rotation about the stationary shaft 61 in the impact direction S32 by the action of the auxiliary release spring 5, this rotation drives the second lever 42 and the control shaft 2 into rotation around the axis A2 in the release direction S22.

The impact arm 6 continues its rotation until its impact end strikes the first arm 41 or a component connected thereto (see FIG. 7). Such an impact makes it possible to transmit an additional breaking force to the first lever 41 in the form of an impact, which is capable of breaking the welded joint between the contacts 91 and 92.

When the weld joint between the contacts 91 and 92 is broken by the action of this impact, the pole shaft 1 and the first arm 41 are then driven into rotation about the axis A1 in the second rotation direction S12 by the action of the release spring 3, dragging the movable contact 91 into translational movement in the direction S14 disconnection. The device 10 thus moves from the configuration in FIG. 7 to the configuration in FIG. 5.

Naturally, when the main mechanism makes it possible to open the contacts 91 and 92 without the need for assistance from the auxiliary mechanism, the transition from the connection position (Fig. 4) to the disconnection position (Fig. 5) is nevertheless reflected in the rotation of the impact arm 6 around the stationary shaft 61 in the impact direction S32, since the control shaft 2 is adapted to enter rotation as a result of the release command, the auxiliary release spring 5 recovers the mechanical energy that it accumulated upon connection. The impact arm 6, however, does not become engaged in this case by means of the entraining element 41, given the geometry and arrangement of the various components of the device 10.

Principle of energy storage by auxiliary mechanism

When contacts 91 and 92 are opened, i.e. when turning the pole shaft 1 from the configuration in Fig. 5 to the configuration in FIG. 4, the auxiliary release spring 5 stores mechanical energy.

Embodiments of the release assist mechanism may naturally differ from the specific embodiment just described. For example, in an embodiment not shown, the auxiliary release spring may be a compression spring.

More generally, the auxiliary mechanism is positioned to store mechanical energy when the movable contact 91 moves toward the connection position, and to return the mechanical energy stored so as to exert an additional release force leading to movement of the movable contact 91 from the connection position along towards the release position when the movable contact 91 is immobilized in the connection position despite the main release force.

Claims (19)

1. A control device (10) for a movable contact (91) relative to a fixed contact (92) of at least one vacuum chamber (90) for an electrical switching device (100), between a connection position in which the movable contact (91) abuts the fixed one contact (92), and a disconnecting position in which the movable contact (91) is located at a distance from the fixed contact (92), this device (10) comprising a main disconnecting and connecting mechanism (1, 2, 3, 4) configured with possibility: - move the movable contact (91) towards the connection position when the device (10) receives a connection command, and accumulate mechanical energy when the movable contact (91) moves towards the connection position, - return the mechanical energy thus accumulated in such a way as to exert a major release force leading to movement of the movable contact (91) from the connection position towards the release position when the device (10) receives the release command, wherein the device is characterized in that it contains an auxiliary mechanism (5, 6, 7, 8) to assist in disconnection, configured to: - accumulate mechanical energy when the movable contact (91) moves towards the connection position, - return the mechanical energy thus accumulated in such a way as to exert an additional disconnecting force leading to movement of the movable contact (91) from the connection position towards the release position, when the movable contact (91) is immobilized in the connection position, despite the action of the main one separating force. 2. Device (10) according to claim 1, in which said main mechanism comprises a captivating element (41), to which a movable contact (91) is connected, a release spring (3), preferably a compression spring, adapted to accumulate and return said own mechanical energy to the main mechanism, wherein the release spring (3) is configured to exert said main release force on the entraining element (41) so as to move the movable contact (91) towards the release position when the device (10) receives the release command , wherein the main mechanism further comprises a control shaft (2) and a main transmission system (42, 43) connecting the control shaft (2) to the entraining element (41), wherein said device (10) is configured so that: - release the rotation of the control shaft (2) when the device (10) receives said release command, - drag the control shaft (2) into rotation in the connection direction (S21), when the device (10) receives said connection command, such rotation of the control shaft (2) moves the movable contact (91) towards the connection position by means of the entrainment element (41) , so that the release spring (3) accumulates said mechanical energy, - prevent rotation of the control shaft (2) when the moving contact (91) is in the connection position. 3. The device (10) according to claim 2, in which the entraining element comprises a pole shaft (1), an entraining element (41) forming a first lever (41) integral in rotation with the pole shaft (1), and at the same time the control shaft (2) is equipped with a second lever (42), integral in rotation with the control shaft (2), while said main transmission system contains a connecting rod (43) for connection, connected to the first (41) lever and the second (42 ) lever. 4. Device (10) according to claim 2 or 3, wherein the auxiliary release assist mechanism comprises an auxiliary release spring (5), preferably a tension spring, wherein the auxiliary release spring (5) is configured to store and return said intrinsic mechanical energy to the auxiliary mechanism, wherein the auxiliary mechanism further comprises an impact arm (6), which can move in rotation around the stationary shaft (61), the auxiliary release spring (5) is configured to apply said additional release force to the impact arm (6) so as to entrain it into rotation around said stationary shaft (61) when the device (10) receives said release command, wherein the impact arm (6) is configured to impart additional release force to said entrainment element (41) in the form of an impact when the movable contact (91) immobilizes in the connection position, despite the action of the main separating force. 5. The device (10) according to claim 3 or 4, wherein the auxiliary mechanism comprises an auxiliary transmission system (7, 8), this auxiliary transmission system comprising a connecting rod (7) for releasing connecting the connecting rod (43) for connecting with the second lever (42), as well as a connecting rod (8) for disconnection, connecting the impact arm (6) with the second lever (42) so as to couple the control shaft (2) and the impact arm (6) in rotation, the mentioned auxiliary mechanism is positioned so that when the device (10) receives a release command and the movable contact (91) is immobilized in the connection position, despite the action of the main release force: - connecting rods for connection (43) and release (7) move in rotation relative to each other through the action of an auxiliary release spring (5), reducing the distance between the end of the connecting rod (43) connected to the first lever (41), and the end connecting rod (7) for release, connected to the second lever (42), - the impact arm (6) is driven into rotation around said stationary shaft (61) by the action of the auxiliary release spring (5) until one of its ends strikes the first arm (41) or a component connected thereto, this impact transmits said additional separating force to the entraining element (41). 6. The device (10) according to claim 5, wherein the auxiliary mechanism comprises a torsion spring (71) configured to orient the direction of rotation of the release connecting rod (7) relative to the connecting rod (43). 7. Device (10) according to any one of claims. 4-6, in which the stationary shaft (61) of the impact arm (6) is parallel to the rotation axes of the pole shaft (1) and the control shaft (2). 8. An electrical switching device (100) comprising one or more vacuum chambers (90), each of which contains a moving contact (91) and a fixed contact (92), characterized in that it contains a device (10) according to any one of claims. 1-7. 9. Electrical switching device (100) according to claim 8, characterized in that it consists of a high-voltage circuit breaker.