Actuating device

Abstract

An actuating device for a switching device of a switchgear in electrical power engineering, in particular medium voltage engineering, comprises a drive unit, which can be operated in particular manually, a swivel unit which can be mechanically coupled to the switching device, and a pull cable by which the swivel unit is mechanically connected to the drive unit.

Description

[0001] The invention relates to an actuating device for a switching device of a switching field in electrical power engineering, in particular medium voltage engineering.

[0002] Switchgear in electrical power engineering systems typically comprises several pieces of equipment whose electrical voltage is monitored for safe operation. Voltage transformers are used for this purpose, connected, for example, to busbars or cable exits of a switchgear panel. It may be necessary to temporarily disconnect (isolate) and ground these voltage transformers from the monitored equipment – ​​for example, to protect them from damage during high-voltage testing of the switchgear panel or for maintenance purposes. In this process, the affected circuit is usually first interrupted by a circuit breaker, and then the voltage transformer is disconnected from the monitored equipment and grounded by actuating a switching device.

[0003] Furthermore, switchgear in electrical power engineering systems often includes switching devices that can be used, for example, to ground the busbars of the switchgear for maintenance purposes. Here, too, the affected circuit is usually first interrupted by a circuit breaker, and then the busbar is grounded by actuating a switching device. After the maintenance is completed, the busbar can be disconnected from earth potential by actuating the switching device, and the circuit can be closed again by the circuit breaker.

[0004] Such a switching device – for example, for grounding a busbar or for disconnecting and grounding a voltage transformer – is usually operated by manually operating a drive unit located on the front of the switchgear. The drive unit is mechanically coupled to the switching device via a linkage in such a way that operating the drive unit actuates the switching device.

[0005] Actuating devices with such a linkage, however, require a lot of installation space and are also complex to install (i.e., especially to attach to a control panel), as they allow, for example, only small tolerances of the linkage's suspension points.

[0006] The invention is therefore based on the objective of enabling an actuating device that is easy to install and requires little installation space.

[0007] This problem is solved by an actuating device having the features of claim 1.

[0008] The invention is based on the idea of ​​coupling a drive unit to a switching device via a pull cable. For this purpose, the actuating device according to the invention comprises a drive unit, which is operated, in particular manually, and is mechanically coupled to a pivotable swivel unit via a pull cable that has a pull cable start and a pull cable end. The swivel unit is designed such that it is pivoted by operating the drive unit via the pull cable. If the swivel unit is mechanically coupled to the switching device, the switching device can be actuated by pivoting the swivel unit. For example, the swivel unit can be rotationally fixed to a shaft of the switching device, and a switching contact of the switching device can be arranged on the shaft.By pivoting the swivel unit, the shaft can also be pivoted, thereby moving the switching contact to a different switching position, in which the switching contact, for example, establishes or disconnects a ground connection.

[0009] The use of a pull cable makes the actuator particularly easy to install: When installing the actuator on a control panel, the swivel unit is mechanically coupled to a switching device on the panel. The drive unit can, for example, be mounted on the front of the control panel. Since the pull cable – unlike a linkage – can be guided flexibly (for example, using pulleys), tolerances, such as those in the relative position of the swivel unit and the drive unit to each other, can be easily compensated for. Furthermore, the swivel unit and the drive unit can also be installed in other relative positions to each other, which means that the drive unit, in particular, can be mounted at almost any location suitable for operation.The pull cable not only allows for easy compensation of tolerances during the installation of the actuating device, but also enables the actuating device to be installed in a wide variety of suitable locations. Furthermore, the actuating device itself can be easily installed or manufactured using the pull cable.

[0010] Another advantage is that, due to the mechanical coupling of the drive unit with the swivel unit via the pull cable, the actuating device can be installed even in confined spaces. In contrast, with a linkage system, minimum distances are required due to suspension points, lever deflections, and / or lever deflections, which typically preclude installation in tight spaces.

[0011] Advantageous embodiments of the invention emerge from the subclaims, the description and the figures.

[0012] In an advantageous embodiment, the swivel unit can include a connector designed to pivot about a pivot axis. This enables simple mechanical coupling of the swivel unit to a switching device, where advantageously the pivot axis of the connector should correspond to a pivot axis of the switching device. Furthermore, the pull cable can be connected to the connector at a distance from the pivot axis at its end. The pull cable need not be directly connected to the connector. Due to the connection of the pull cable to the connector at a distance from the pivot axis, a pulling movement of the pull cable can easily generate a torque acting on the connector about the pivot axis, thereby pivoting the connector.

[0013] According to a further advantageous embodiment, the pivoting unit can comprise a return spring with a first return spring end and a second return spring end, which can be designed, in particular, as a tension spring or a torsion spring. Furthermore, the return spring can be attached to the connector, in particular hinged, at a distance from the pivot axis with its first return spring end. With its second return spring end, the return spring can, for example, be attached to the control panel during the installation of the actuating device, in particular hinged. If the return spring is attached to the connector at a distance from the pivot axis, in particular hinged, the return spring can easily generate a torque acting on the connector about the pivot axis, thereby pivoting the connector.In principle, the return spring can have a screw tab at one or both ends, which allows it to be attached, particularly by pivoting. Advantageously, the return spring can be pre-tensioned to maintain the pull cable at a defined tension, thus ensuring, for example, backlash-free operation of the actuating device. The return spring allows the connector to be easily pivoted back into its original position after being moved. For example, when a tensile force is applied to the pull cable, causing the connector to pivot, the return spring can be tensioned and subjected to spring force. When the tensile force decreases, the spring force of the tensioned return spring allows the connector to pivot back into its original position.

[0014] In a further advantageous embodiment, the swivel unit can comprise a first base on which components of the swivel unit can be arranged, thus simplifying the manufacture of the actuating device. In particular, the swivel unit can be easily attached to a switch panel by means of the first base. Preferably, the pull cable is supported on the first base. However, the pull cable can also be supported in another way, for example, by means of a pulley attached to a switch panel. Alternatively or additionally, the connecting piece can be pivotably mounted on the first base about the pivot axis. If the swivel unit is installed on a switch panel, the pivotable mounting can reduce bending moments on a shaft of a switching device of the switch panel.Alternatively or additionally, the return spring can be attached to the first base with its second return spring end, in particular by a hinge.

[0015] In a further advantageous embodiment, the connecting piece can include a guide pin spaced parallel to the pivot axis. The first base can have a first guide track in which the guide pin is guided. Advantageously, the first guide track has the form of an annular segment. The ends of the annular segment can each form a stop for the guide pin, thereby restricting the pivoting of the connecting piece to a predefined angular range. Advantageously, the angular range predefined by means of the stops can be matched to the movement of a switching contact of a switching device, which the switching contact performs when it is moved to a different switching position.Advantageously, the predefined angular range is adapted to the movement of the switching contact of the switching device such that the guide pin abuts the respective end of the first guide cam when the switching contact is in a given end position or switching state. Thus, end positions of the switching device can be easily defined using the first guide cam. In particular, the angular range can be adapted to the movement of the switching contact in such a way that the force with which the switching contact is pressed against a ground contact, for example by the return spring (if one is provided), can be limited. For this purpose, the first guide cam can be designed, for example, such that the guide pin abuts one end of the first guide cam when the switching contact of the switching device is in a switching state.In particular, this allows a defined contact force to be set and reduces damage. Furthermore, the guide pin can provide a visually perceptible indication of the switching position of a switching device.

[0016] According to a further advantageous embodiment, the pivoting unit can comprise a tension spring with a first end and a second end, which can be designed, in particular, as a tension spring or a torsion spring. The tension spring can be attached, in particular hinged, to the connecting piece with its first end at the end of the pull cable and with its second end spaced apart from the pivot axis. The tension spring can also have a screw tab at one or both ends, with which the tension spring can be attached, in particular hinged. Preferably, the tension spring is pre-tensioned to keep the pull cable at a defined tension at all times, thereby achieving, for example, backlash-free operation of the actuating device.Furthermore, the tension spring and / or the return spring can be used, for example, to compensate for temperature-related changes in the length of the pull cable, thereby enabling backlash-free operation of the actuating device.

[0017] In a further advantageous embodiment, the cable can be guided within a Bowden cable housing with a first and a second housing end. For example, the first housing end can be supported at the first base, if one is provided. For this purpose, the first base can include a cable stop that receives the first housing end. However, such a cable stop can also be attached directly to the control panel. Due to the guidance within the Bowden cable housing, the cable can be protected and guided without the need for, for example, pulleys. In particular, guiding the cable within the Bowden cable housing simplifies the installation of the actuating device and makes it possible even in confined spaces.

[0018] According to a further advantageous embodiment, the drive unit can be configured to apply a tensile force to the pull cable in order to pivot the swivel unit. For this purpose, the drive unit can, for example, comprise a pull piece rotatable about a pivot axis, which can, in particular, have a plug-in section connectable to a hand crank. The pull cable can be connected to the pull piece at a distance from its beginning relative to the pivot axis. The plug-in section can be coaxial with the pivot axis. By driving the pull piece with the hand crank, the pull cable can be easily subjected to a tensile force. The drive unit can also, for example, include an operable drive motor, which can be configured to drive the pull piece via a motor control to apply a tensile force to the pull cable.

[0019] According to a further advantageous embodiment, the drive unit can include a releasable locking device, which can be configured to block the pull piece and thus, via the pull cable, the swivel unit against pivoting. This allows the swivel unit to be easily locked against pivoting back in a pivoted position, so that the swivel unit can only be pivoted back after the locking device is released. If the actuating device is installed on a switch panel, it can, for example, move a switching contact of a switching device of the switch panel into a switching position and lock it in this position by means of the locking device. In the locked state, the return spring – if provided – cannot move the switching contact to a different position. However, this is possible again after the locking device is released.Since the drive unit includes the releasable locking device, the safety of a switch panel equipped with the operating device can also be increased: Because the locking device directly blocks only the drive unit, but indirectly blocks the swivel unit via the pull cable, the swivel unit can be pivoted back, for example, due to the return spring (if one is provided), should the pull cable break. In this case, a switching contact of the switching device can be reliably moved into a switch position in which the switching contact, for example, contacts an earth contact. The locking device can also be secured in the locked state, for example, with a padlock, which must be removed before the locking device can be released.

[0020] In a further advantageous embodiment, the locking device can comprise a locking bolt with a spring-loaded detent pin. The pull piece can have a recess designed to receive the detent pin, particularly in a form-fitting manner. Advantageously, the recess is spaced apart from the axis of rotation. For example, the locking device can be released manually, particularly by pulling the detent pin. However, the locking device can also be released electrically, for example, by actuating an electromagnet interacting with the locking device. In this case, the locking device advantageously has a latching mechanism interacting with the electromagnet, which is designed to lock the pull piece, whereby the latching mechanism can be released by actuating the electromagnet and the pull piece can be rotated again.

[0021] In a further advantageous embodiment, the drive unit can comprise a second base on which components of the drive unit can be arranged, thus simplifying the manufacture of the actuating device. In particular, the drive unit can be easily attached to, for example, the front of a switch panel by means of the second base. Preferably, the pull cable is supported on the second base, although the pull cable can also be supported in another way, for example, by means of a pulley attached to a switch panel. If the pull cable is guided in a Bowden cable housing, the second end of the Bowden cable housing can be supported on the second base. For this purpose, the second base can include a cable stop that receives the second end of the Bowden cable housing. However, such a cable stop can also be attached directly to the switch panel.Alternatively or additionally, the pull piece can be rotatably mounted on the second base about the axis of rotation. Alternatively or additionally, the locking device can also be arranged on the second base.

[0022] In a further advantageous embodiment, the pull piece can include a guide pin spaced parallel to the axis of rotation. The second base can have a second guide track in which the guide pin is guided. Advantageously, the second guide track has the form of an annular segment. The ends of the annular segment can each form a stop for the guide pin, thus restricting the pull piece's rotation to a predefined angular range. Advantageously, the angular range predefined by means of the stops can be aligned with the movement of a switching contact of a switching device, which the switching contact performs when it is moved to a different switch position.Advantageously, the predefined angular range is adapted to the movement of the switching contact of the switching device such that the guide pin abuts the respective end of the second guide track when the switching contact is in a given end position or switching state. Thus, the end positions of the switching device can be easily defined using the second guide track. In particular, the angular range can be adapted to the movement of the switching contact in such a way that the force with which the switching contact is pressed against a busbar contact, for example due to a tensile force acting on the pull cable, can be limited. For this purpose, the second guide track can be designed, for example, such that the guide pin abuts one end of the second guide track when the switching contact of the switching device is in a switching state.In particular, this allows for the setting of a defined contact force and reduces damage. The stops also simplify the operation of the drive unit, as an operator can see from the stop that the pull rod has been rotated sufficiently to change a switch position. Furthermore, the guide pin can visually indicate the switch position of a switching device.

[0023] Furthermore, the invention relates to a switching field for electrical power engineering, in particular medium voltage engineering, with a switching device and an actuating device mechanically coupled to the switching device as disclosed herein.

[0024] Furthermore, the invention relates to a method for actuating a switching device of a switchgear in electrical power engineering, in particular medium-voltage engineering, by means of an actuating device mechanically coupled to the switching device. The actuating device can be designed as disclosed herein. The method comprises: operating a drive unit of the actuating device, whereby a pull cable is subjected to a tensile force such that a pivoting unit mechanically coupled to the switching device is pivoted, thereby actuating the switching device.

[0025] In general, the descriptions of the actuating device according to the invention apply accordingly to the switching panel and the method according to the invention. This applies in particular with regard to embodiments and advantages. Furthermore, it is understood that all features mentioned herein can be combined with one another, unless explicitly stated otherwise.

[0026] The invention is described below by way of example with reference to the figures. These show schematically... Fig. 1 shows a control panel with an actuating device in a side view, and Fig. 2 shows the actuating device of Fig. 1 in a front view.

[0027] Fig. 1 Figure 1 shows a side view of a switchgear panel 11 for medium-voltage technology with a switching device 15 and an actuating device 13 mechanically coupled to the switching device 15. Elements located within the switchgear panel 11 are shown with dashed lines, whereby for the sake of clarity only elements that serve to illustrate the operation of the actuating device 13 are shown.

[0028] Like conventional medium-voltage switchgear, switchgear 11 comprises a cable connection compartment K, a circuit breaker compartment L, and a busbar compartment S, which may be filled with an insulating gas such as sulfur hexafluoride to improve their dielectric strength. Furthermore, switchgear 11 includes three busbars 29, each of which is routed into the interior of switchgear 11 via a bushing 37 and extends perpendicular to the plane of the drawing. Each busbar 29 is assigned to one phase of a three-phase system – switchgear 11 is therefore three-phase. For the sake of clarity, only the following are shown in Fig. 1 The left phase is discussed in more detail below. However, it is already understood, for reasons of symmetry, that the individual phases are essentially identical. Furthermore, it is understood that the invention disclosed herein is also applicable to switchgear with a different number of phases, for example, single-phase or two-phase systems.

[0029] To monitor the voltage at the busbar 29, the switchgear 11 includes a voltage transformer 35, which is located in Fig. 1 The switching panel 11 is connected to the busbar 29 via a sliding contact 33 and a switching contact 27. The switching panel 11 also includes the switching device 15, by means of which the voltage transformer 35 can be disconnected from the busbar 29 and connected to earth potential. For this purpose, the switching device 15 has a shaft 25 rotatably mounted on the switching panel 11 (illustrated by a double arrow), on which the switching contact 27 is fixedly arranged. The switching panel 11 also includes an earth contact 31, which can be contacted by the switching contact 27. For this purpose, the switching contact 27 can be displaced by rotating the shaft 25 so that the switching contact 27 contacts the earth contact 31. The voltage transformer 35 is then connected to the earth contact 31 via the sliding contact 33 and the switching contact 27.Consequently, the switching contact 27 can be moved by rotating the shaft 25 into a switch position in which the voltage transformer 35 is connected to the busbar 29, and into a switch position in which the voltage transformer 35 is disconnected from the busbar 29 and connected to the earth contact 31. It is understood that the shaft 25 is designed such that it does not cause short circuits, in particular between the individual phases.

[0030] The actuating device 13 according to the invention can actuate the switching device 15 of the switch panel 11, i.e., the switching contact 27 can be moved from one switch position to the other. For this purpose, the actuating device 13 comprises a pivotable pivoting unit 19, which is mechanically coupled to the shaft 25. Furthermore, the actuating device 13 comprises a manually operated drive unit 17, which is mechanically connected to the pivoting unit 19 via a pull cable 21. The pull cable 21 is guided in a Bowden cable housing 23, the ends of which are supported on the drive unit 17 and on the pivoting unit 19, respectively. The actuating device 13 is designed such that operating the drive unit 17 exerts a tensile force on the pull cable 21 in the direction of the drive unit 17, thereby pivoting the pivoting unit 19.At the same time, the shaft 25, which is mechanically coupled to the swivel unit 19, is pivoted so that the switching contact 27 moves from the switch position in which the voltage transformer 35 is connected to the earth contact 31 to the position in . Fig. 1 The switch position shown, in which the voltage converter 35 is connected to the busbar 29, is shifted.

[0031] Fig. 2 shows the actuating device 13 in a front view. Fig. 1 for the in Fig. 1 The illustrated switch position of the switching contact 27. The swivel unit 19 comprises a connecting piece 39 designed to be rotatable about a swivel axis 79 in two directions (illustrated by a double arrow), which is rotatably or pivotably mounted on a first base 61. By means of the first base 61, the swivel unit 19 is attached to the switching panel 11. Fig. 1 It is ensured that the pivot axis of the shaft 25 and the pivot axis 79 of the connecting piece 39 are identical within the limits of manufacturing feasibility. The connecting piece 39 is screwed to the shaft 25 in a rotationally fixed manner by means of a screw connection (not shown in detail).

[0032] The pivoting unit 19 further comprises a return spring 41 designed as a tension spring, with a first return spring end 43 and a second return spring end 45. The return spring 41 is articulated at its first return spring end 43 to the connecting piece 39 via a screw tab 47, spaced apart from the pivot axis 79. At its second return spring end 45, the return spring 41 is articulated at the first base 61 via a screw tab.

[0033] Furthermore, the swivel unit 19 includes a tension spring 49 designed as a tension spring. The tension spring 49 has a first tension spring end 51, which is pivotally connected to the tension cable end 55 via a screw tab. The second tension spring end 53 is pivotally connected to the connecting piece 39 via a screw tab, spaced apart from the swivel axis 79.

[0034] Furthermore, the connecting piece 39 includes a guide pin 57, which is arranged parallel to the pivot axis 79 at a distance from the pivot axis. The first base 61 also has a first guide track 59 in the form of a circular ring segment, in which the guide pin 57 is guided.

[0035] The drive unit 17 comprises a second base 77 and a pull piece 65 mounted on the second base 77 so as to be rotatable in two directions about a pivot axis 81 (illustrated by a double arrow). The pull piece 65 has a plug-in section (not shown) designed to be connectable to a hand crank, onto which a hand crank can be attached to operate the drive unit 17.

[0036] The pull piece 65 further comprises a guide pin 73, which is spaced parallel to the axis of rotation 81, and to which the pull rope 21 is attached with its pull rope beginning 67. The second base 77 has a second guide track 71 in the form of a circular ring segment, in which the guide pin 73 is guided.

[0037] Furthermore, the drive unit 17 includes a releasable locking device 75, which is arranged on the second base 77 and is designed to lock the pivoting unit 19 in the position shown in Fig. 2 The locking device 75 is designed to prevent the shown state from pivoting. For this purpose, it comprises a locking bolt with a spring-loaded detent pin, which is positively engaged in a recess formed in the pull piece 65 (not shown).

[0038] The swivel unit 19 is mechanically connected to the drive unit 17 via the pull cable 21. The Bowden cable housing 23, which is provided for guiding the pull cable 21, comprises a first Bowden cable housing end 63, which is supported at the first base 61 by means of a cable stop (not shown), and a second Bowden cable housing end 69, which is supported at the second base 77 by means of a cable stop (not shown).

[0039] As already mentioned, this corresponds to the in Fig. 2 The depicted state of the actuating device 13 represents the switch position of the switching contact 27 in which the voltage transformer 35 is connected to the busbar 29. In this state, the guide pin 57 and the guide mandrel 73 abut a stop on the first guide cam 59 and the second guide cam 71, respectively, thereby limiting the force with which the switching contact 27 presses against a contact (not shown) on the busbar 29. Furthermore, the connecting piece 39 is blocked against pivoting, as the locking device 75 blocks the pull piece 65.

[0040] Furthermore, in the Fig. 2 In the shown state of the actuating device 13, the return spring 41 is tensioned so that the connecting piece 39 is pivoted when the locking device 75 is released, with the return spring 41 relaxing, until the guide pin 57 is on the Fig. 2 the right stop of the guide track 59 strikes the ground. Since the return spring 41 is pre-tensioned, it does not fully relax, but merely exhibits a slight movement compared to the position shown in the text. Fig. 2 The tension shown is lower than in the depicted state. The tension spring 49 is also pre-tensioned and therefore does not fully relax, but only exhibits a lower tension compared to the state shown in the diagram. Fig. 2 The shown state exhibits lower tension. Simultaneously, this pivoting movement of the connecting piece 39 rotates the pull piece 63 via the pull cable 21 until the guide pin 73 is in Fig. 2 the left stop of the guide track 71 abuts. This pivoting of the connecting piece 39 also pivots the shaft 25, whereby the switching contact 27 is disengaged from the Fig. 1 The switch position shown, in which the switching contact 27 contacts the busbar 29, is shifted to the switch position in which the switching contact 27 contacts the earth contact 31. In this switch position, the voltage transformer 35 is disconnected from the busbar 29 and connected to earth potential. The force with which the switching contact 27 is pressed against the earth contact 31 can be determined in particular by the abutment of the guide pin 57 against the Fig. 2 The right end of the first leading backdrop 59 will be limited.

[0041] To reconnect the voltage converter 35 to the busbar 29, the pull piece 65 can be turned with the hand crank and locked by means of the locking device 75. The connecting piece 39 is then moved via the pull cable 21, with the return spring 41 being re-tensioned, into the Fig. 2 The state shown is pivoted. At the same time, the shaft 25, which is mechanically coupled to the connecting piece 39, is pivoted, whereby the voltage transformer 35 is disconnected from the earth contact 31 and the switching contact 27 is moved into a switch position in which the voltage transformer 35 is connected to the busbar 29 via the sliding contact 33 and the switching contact 27. Bezugszeichenliste

[0042] 11 Switch panel 13 Actuating device 15 Switching device 17 Drive unit 19 Swivel unit 21 Pull cable 23 Bowden cable housing 25 Shaft 27 Switching contact 29 Busbar 31 Ground contact 33 Sliding contact 35 Voltage converter 37 Bushing 39 Connector 41 Return spring 43 First return spring end 45 Second return spring end 47 Screw tab 49 Tension spring 51 First tension spring end 53 Second tension spring end 55 Pull cable end 57 Guide pin 59 First guide cam 61 First base 63 First Bowden cable housing end 65 Pull section 67 Pull cable start 69 Second Bowden cable housing end 71 Second guide cam 73 Guide pin 75 Locking device 77 Second base 79 Swivel axis 81 Rotary axis Busbar compartment L Circuit breaker compartment K Cable connection compartment

Claims

1. Actuating device (13) for a switching device (15) of a switchgear panel of electrical power engineering, in particular medium-voltage engineering, with an operable drive unit (17), a pull cable (21) which is fastened to the drive unit (17) by its pull cable start (67), and a pivoting unit (19) which can be mechanically coupled to the switching device (15) and which is mechanically connected to the drive unit (17) via the pull cable (21).

2. Actuating device (13) according to claim 1, wherein the pivoting unit (19) comprises a connecting piece (39) designed to be pivotable about a pivot axis (79) and the traction cable (21) is connected to the connecting piece (39) with its traction cable end (55) spaced from the pivot axis (79).

3. Actuating device (13) according to claim 2, wherein the pivoting unit (19) comprises a return spring (41), in particular designed as a tension spring, which is fastened, in particular articulated, to the connecting piece (39) at a distance from the pivot axis (79).

4. Actuating device (13) according to at least one of claims 1 to 3, wherein the pivoting unit (19) comprises a first base (61) on which the traction cable (21) is supported, the connecting piece (39) is mounted pivotably about the pivot axis (79), and / or on which the return spring (41) is fastened, in particular articulated.

5. Actuating device (13) according to claim 4, wherein the connecting piece (39) comprises a guide pin (57) which is spaced parallel to the pivot axis (79), wherein the first base (61) has a first guide slot (59) in which the guide pin (57) is guided.

6. Actuating device (13) according to one of claims 2 to 5, wherein the pivoting unit (19) comprises a tension spring (49), in particular designed as a tension spring, which is fastened, in particular articulated, to the connection piece (39) at the traction cable end (55) and at a distance from the pivot axis (79).

7. Actuating device (13) according to one of the preceding claims, wherein the pull cable (21) is guided in a Bowden cable sheath (23).

8. Actuating device (13) according to one of the preceding claims, wherein the drive unit (17) is designed to apply a tensile force to the traction cable (21) in order to pivot the pivoting unit (19).

9. Actuating device (13) according to one of the preceding claims, wherein the drive unit (17) comprises a pull piece (65) which is designed to be rotatable about an axis of rotation (81), which in particular has a plug-in section designed to be connectable to a hand crank, wherein the pull cable (21) is connected to the pull piece (65) with its pull cable start (67) at a distance from the axis of rotation (81).

10. Actuating device (13) according to one of the preceding claims, wherein the drive unit (17) comprises a releasable blocking device (75) which is designed to block the pivoting unit (19) against pivoting.

11. Actuating device (13) according to claims 9 and 10, wherein the blocking device (75) comprises a locking bolt with a spring-loaded locking pin and the pulling piece (65) has a recess designed to positively receive the locking pin.

12. Actuating device (13) according to at least one of claims 9 to 11, wherein the drive unit (17) comprises a second base (77) on which the traction cable (21) is supported, the traction piece (65) is mounted rotatably about the rotation axis (81), and / or on which the blocking device (75) is arranged.

13. Actuating device (13) according to claim 12, wherein the pulling piece (65) comprises a guide pin (73) which is spaced parallel to the axis of rotation (81), wherein the second base (77) has a second guide slot (71) in which the guide pin (73) is guided.

14. Switchgear panel (11) of electrical power engineering, in particular medium-voltage engineering, with a switching device (15) and an actuating device (13) mechanically coupled to the switching device (15) according to one of the preceding claims.

15. A method for actuating a switching device (15) of a switchgear panel (11) of electrical power engineering, in particular medium-voltage engineering, by means of an actuating device (13) mechanically coupled to the switching device (15), in particular according to one of claims 1 to 13, comprising: operating a drive unit (17) of the actuating device (13), whereby a pulling cable (21) is subjected to a pulling force in such a way that a pivoting unit (19) mechanically coupled to the switching device (15) is pivoted, whereby the switching device (15) is actuated.

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