Switching device with drive system

Abstract

The invention relates to a switching device (1) comprising a switch (17) and a servo drive system. The servo drive system comprises a drive shaft (17), a motor (12) for driving the drive shaft (16), a power component (11) for supplying energy to the motor (12), a control unit (10) and a feedback system (4). The feedback system (4) is configured to determine at least two values of an absolute position of the drive shaft (16) and to generate a feedback signal based on the at least two values. The control unit (10) is implemented as a programmable safety controller and is configured to manipulate the power component (11) depending on at least one setpoint value. The control unit (10) is configured to influence the operation of the motor (12) depending on the feedback signal, to recognize the presence of at least one safety-relevant event and to transmit at least one control signal to the power component (11) in the event of a safety-relevant event. The power component (11) is configured to initiate or implement at least one safety measure depending on the control signal.

Description

Technical Field

[0001] The present invention relates to a switching device, particularly a tap changer device, having a switch, particularly an on-load tap changer, and a servo drive system for the switch, particularly the on-load tap changer. Background Technology

[0002] Substations contain a large number of switches used for different tasks and with different requirements. To operate these switches, a drive system is necessary. These switches specifically include on-load tap changers, load switching switches, selectors, double commutators, commutators, preselectors, power switches, load switches, and circuit breakers.

[0003] Therefore, on-load tap changers are used, for example, to make uninterrupted switching between different winding taps of electrical operating devices, such as power transformers or adjustable chokes. This allows, for example, the transmission ratio of the transformer or the inductance of the choke to be changed. Double commutators are used to reverse the winding polarity during power transformer operation.

[0004] All these switches constitute high-level safety-related components in electrical operating devices because the switching occurs during operation and is therefore connected to energy networks, for example. In extreme cases, operational disturbances can have serious technical and economic consequences. Summary of the Invention

[0005] Therefore, the objective of this invention is to provide an improved solution for driving switches, particularly on-load tap changers, load switching switches, selectors, double commutators, commutators, preselectors, power switches, load switches, or circuit breakers, thereby improving operational safety.

[0006] According to this improved solution, a switching device is proposed, comprising a switch and a servo drive system for the switch. The servo drive system includes: a drive shaft connecting the servo drive system to the switch, a motor for driving the drive shaft, a power component for supplying energy to the motor, a control unit, and a feedback system. The feedback system is configured to determine at least two values ​​of the absolute position of the drive shaft and generate a feedback signal based on the at least two values. The control unit is implemented as a programmable safety controller and is configured to operate the power component according to at least one rated value. Furthermore, the control unit is configured to influence the operation of the motor based on the feedback signal, identify the existence of at least one safety-related event, and transmit at least one control signal to the power component in the event of a safety-related event. The power component is configured to initiate or implement at least one safety measure based on the control signal.

[0007] The term "value of the position of the drive shaft" also includes such measured variable values, from which the position of the drive shaft can be determined unilaterally (if necessary, within tolerance).

[0008] By determining at least two values ​​for the position of the drive shaft, the control device can perform a reliability check on the position determination or reconcile the two values, thereby improving the safety of the position determination and reducing the corresponding residual risk of erroneous position determination. Furthermore, if a partial failure of the feedback device results in only one value for the drive shaft position being determined, the drive shaft does not need to be stopped immediately. At least the switches, especially on-load tap changers, load switching switches, selectors, double commutators, commutators, preselectors, power switches, load switches, or circuit breakers, can still be adjusted to a safe operating position even in the event of partial failure. Ultimately, this improves the operational safety of the servo drive system, switches, especially on-load tap changers, load switching switches, selectors, double commutators, commutators, preselectors, power switches, load switches, or circuit breakers, and operating devices.

[0009] According to at least one embodiment, the switch is configured as an on-load tap changer, a load switching switch, a selector, a double commutator, a commutator, a preselector, a power switch, a load switch, or a circuit breaker.

[0010] According to at least one embodiment, a servo drive system is used to drive the shaft of a switch (especially an on-load tap changer, load changing switch, selector, double commutator, commutator, preselector, power switch, load switch, or circuit breaker) or a corresponding component of the switch (especially an on-load tap changer, load changing switch, selector, double commutator, commutator, preselector, power switch, load switch, or circuit breaker). This causes the switch (especially an on-load tap changer, load changing switch, selector, double commutator, commutator, preselector, power switch, load switch, or circuit breaker) to perform one or more operations, such as switching between two winding taps of a running device or a portion thereof, such as load switching, selector operation, or preselector operation.

[0011] According to at least one embodiment, the drive shaft is directly or indirectly, especially via one or more transmission mechanisms, connected to the switch, especially the shaft of the switch.

[0012] According to at least one embodiment, the drive shaft is directly or indirectly, especially via one or more transmission mechanisms, connected to the motor, especially the motor shaft of the motor.

[0013] According to at least one embodiment, the position of the motor shaft, especially its absolute position, corresponds to the position of the drive shaft, especially its absolute position. This means that the position of the drive shaft can be inferred unilaterally from the position of the motor shaft (within tolerances if necessary).

[0014] According to at least one embodiment, "influence" includes controlling, regulating, braking, accelerating, or stopping the motor. Regulation may include, for example, position adjustment, speed adjustment, acceleration adjustment, or torque adjustment.

[0015] According to at least one embodiment, the power component is configured as a converter or servo converter or an equivalent electronic unit, especially a fully electronic unit, for driving a machine.

[0016] Depending on the implementation, the control device may include a feedback system in whole or in part.

[0017] According to at least one embodiment, the feedback system is configured to determine a first value of the at least two values ​​of the drive shaft position according to a first method and a second value of the at least two values ​​of the drive shaft position according to a second method, the two methods being different from each other. This creates diverse redundancy, which further improves operational safety.

[0018] The two methods may be based on different technologies or physical principles or use different hardware components.

[0019] According to at least one embodiment, one of the at least two values ​​of the position of the drive shaft is a first value of the absolute position of the drive shaft.

[0020] According to at least one embodiment, another of the at least two values ​​of the position of the drive shaft is a second value of the absolute position of the drive shaft.

[0021] According to at least one embodiment, one of the at least two values ​​of the position of the drive shaft is an incremental value of the position of the drive shaft or a value of the relative position of the drive shaft.

[0022] The first and / or second values ​​of the absolute position can be reconciled by the control unit with incremental or relative values, thereby checking the reliability of the first and / or second values ​​of the absolute position. In the event of a significant deviation, the control unit can send a control signal to the power unit to activate safety measures.

[0023] According to at least one embodiment, the feedback system is configured to determine one of the at least two values ​​for obtaining the rotor position of the motor and determining the position of the drive shaft based on the rotor position.

[0024] According to at least one embodiment, the rotor position is the angular range in which the rotor of the motor is located, combined with, if necessary, the number of complete rotations of the rotor.

[0025] Therefore, depending on the rotor design, especially the number of pole pairs, the position or absolute position of the motor shaft can be precisely determined, for example, by the control unit up to at least 180°. The positional accuracy of the drive shaft can be greatly increased by the reduction speed achieved through one or more transmission mechanisms. The evaluation performed by the control unit corresponds to, to some extent, the function of a virtual encoder. Therefore, even in the event of a complete failure of the absolute encoder in the feedback system, at least one emergency operation can be maintained and / or the switch can be placed in a safe position.

[0026] According to at least one embodiment, the feedback system includes an absolute encoder configured and set to detect the absolute position of a drive shaft or the absolute position of another shaft connected to the drive shaft and generate at least one output signal based on the detected position. The feedback system is configured to determine one of at least two values ​​of the position of the drive shaft based on the at least one output signal, particularly a first value and / or a second value of the absolute position.

[0027] According to at least one embodiment, the absolute encoder is directly or indirectly fixed to the motor shaft, drive shaft, or shaft connected thereto.

[0028] According to at least one embodiment, an absolute encoder has a first output terminal for outputting a first or second value of absolute position and a second output terminal for outputting an incremental or relative value of position.

[0029] The term "absolute encoder" includes both a device that obtains two values ​​of position in different ways and a device that has two independent encoders, at least one of which is an absolute encoder.

[0030] According to at least one embodiment, the absolute encoder includes a multi-turn rotary encoder.

[0031] According to at least one embodiment, an absolute encoder is configured to detect the position of a drive shaft or the position of another shaft by means of a first scanning method.

[0032] According to at least one embodiment, an absolute encoder is configured to additionally detect the position of a drive shaft or the position of another shaft by means of a second scanning method independent of the first scanning method.

[0033] According to at least one embodiment, the first or second scanning method includes optical, magnetic, capacitive, resistive or inductive scanning methods.

[0034] According to at least one embodiment, the first scanning method differs from the second scanning method.

[0035] According to at least one embodiment, the absolute encoder is shaped-locked to the drive shaft, motor shaft, or the other shaft.

[0036] According to at least one embodiment, the absolute encoder is additionally force-locked or material-locked, for example by adhesive connection, to the drive shaft, motor shaft, or said other shaft.

[0037] Form-locking and additional material-locking or force-locking connections further enhance the fixation of absolute encoders and ultimately improve operational safety.

[0038] A programmable safety controller refers to a controller that includes two processor units, specifically two programmable logic controllers (SPS). These two processor units use the same process flow at the input and output of the control unit and execute the user program stored in the control unit in parallel.

[0039] According to at least one embodiment, the user program contains multiple instructions. When these instructions are executed by the control unit, this results in the manipulation of power components according to rated values. This drives the motor and ultimately the switch to perform one or more operations, such as switching or part of a switching between two winding taps of the operating device, for example, load switching, selector operation, or preselector operation in the case of a switch configured as an on-load tap changer.

[0040] According to at least one embodiment, the control unit includes first and second processor units. The control unit is configured to execute a switching command execution program, particularly a user program, for implementing a switch, with the first and second processor units executing the program in parallel.

[0041] The use of a programmable safety controller as a control unit and the associated redundancy improves the operational safety of the switching device.

[0042] According to at least one embodiment, the control unit is configured to perform at least one reconciliation, particularly continuous reconciliation, between the first and second processor units during program execution.

[0043] According to at least one embodiment, the reconciliation includes comparing a process image in a first processor unit with a process image in a second processor unit, particularly a cyclic comparison.

[0044] According to at least one embodiment, the control unit is configured to initiate further safety measures based on the result, particularly if the result of the at least one reconciliation or comparison of the process image is negative.

[0045] According to at least one embodiment, the safety measures or further safety measures include: safely stopping the motor, blocking or stopping the power components, or triggering a power switch that connects or disconnects the operating device from the energy network. Safely stopping the motor is particularly performed such that the switch is in a safe position after safe stopping. Activating the safety measures includes outputting at least one safety signal.

[0046] According to at least one embodiment, the safe stopping of the motor includes a safety function corresponding to the stopping category according to industry standard EN 60204-1:2006, the contents of which are incorporated herein by reference.

[0047] According to at least one embodiment, stopping the motor safely includes a Safe Torque Off (STO) safety function, a Safe Stop 1 (SS1) safety function, a Safe Stop 2 (SS2) safety function, or a Safe Operation Stop (SOS) safety function.

[0048] According to at least one implementation, the hardware of the first processor unit is different from the hardware of the second processor unit.

[0049] This results in diverse redundancies, which further enhances operational safety.

[0050] According to at least one embodiment, the control unit is configured to check the locking conditions of two or more components of the switching device.

[0051] The components of the switching device may include components of the switch, such as selectors, preselectors, polarity circuits, or load switching switches of on-load tap changers when the switch is configured as an on-load tap changer.

[0052] The components of the switching device may also include components that are not part of the switch, particularly components of other switches in the switching device or other switching components of the switching device. Two switches configured as on-load tap switches may, for example, be on-load tap switches for different phases of an energy network. The other switching components may include, for example, converters, dual commutators, or advanced delay switches (ARS).

[0053] The locking condition here may correspond to a provision that one of the components can or cannot be manipulated only when the other component is in a specific state, such as a specific position, a specific switching state, or a specific motion state.

[0054] According to at least one embodiment, the control unit is configured to initiate safety measures based on the result, particularly if the result of the lockout condition check is negative.

[0055] Operational safety can be further enhanced by checking locking conditions and activating safety measures when necessary, without requiring special structural measures for switches or other components, such as mechanical or electromechanical systems, cam switches, or the like.

[0056] According to at least one embodiment, for example when the switching device is an on-load tap changer, load switching switch, selector, double commutator, commutator, preselector, power switch, load switch or circuit breaker, the switching device is assigned to electrical operating devices, such as power transformers or phase-shifting transformers.

[0057] According to at least one embodiment, the control unit has an input terminal and an output terminal, and is configured as an input terminal or an output terminal for clock control.

[0058] According to at least one embodiment, the control unit is configured to check the presence of a cross circuit based on an input signal appearing at an input terminal and / or an output signal appearing at an output terminal.

[0059] A cross circuit refers to a short circuit between the connecting lines of two adjacent input or output terminals.

[0060] According to at least one embodiment, the control unit is configured to initiate further safety measures based on the inspection results, especially in the presence of cross-circuit faults.

[0061] The operational safety of the switchgear is improved by activating safety measures or further safety measures in the event of a safety-related incident.

[0062] According to at least one embodiment, the power component is configured to stop the motor, in particular to bring it to a safe stop, by a first safety measure among the at least one safety measure. This stopping may also include movement within defined tolerances.

[0063] According to at least one embodiment, safely stopping the motor includes a safety function corresponding to the stopping category according to industry standard EN 60204-1:2006, the contents of which are incorporated herein by reference.

[0064] According to at least one embodiment, stopping the motor safely includes a Safe Torque Off (STO) safety function, a Safe Stop 1 (SS1) safety function, a Safe Stop 2 (SS2) safety function, or a Safe Operation Stop (SOS) safety function.

[0065] According to at least one implementation, safety measures include monitoring the movement or position of the motor, especially the motor shaft.

[0066] According to at least one implementation, the monitoring of motor movement includes a safety speed limit (SLS) safety function, a safety speed monitoring (SSM) safety function, a safety speed range (SSR) safety function, a safety limit position (SLP) safety function, a safety position (SP) safety function, or a safety direction (SDI) safety function.

[0067] According to at least one implementation, the first safety measure includes stopping the motor uncontrollably.

[0068] According to at least one embodiment, the power components are configured to completely interrupt the energy supply to the motor based on a control signal. In particular, the first safety measure includes interrupting the energy supply immediately or without delay. This energy supply remains interrupted even when the motor stops, so the motor can no longer provide torque (corresponding to STO).

[0069] According to at least one embodiment, the power component is configured to controllably brake or stop the motor according to a control signal, while maintaining an energy supply to the motor during this period.

[0070] According to at least one embodiment, the power component is configured to completely interrupt the energy supply to the motor after controlled braking or stopping according to a control signal, so that the motor can no longer provide torque (corresponding to SS1).

[0071] According to at least one embodiment, the power component is configured to maintain the energy supply to the motor after controlled braking or stopping according to a control signal and to adjust the position of the motor, in particular the motor shaft, to a rated position (corresponding to SS2).

[0072] According to at least one embodiment, the power component is configured to initiate further safety measures, particularly including STO or SS1 safety functions, in the event of a violation of tolerances with respect to the rated position.

[0073] According to at least one embodiment, the power component is configured to limit the speed or rotational speed of the motor shaft by a second safety measure among the at least one safety measures.

[0074] According to at least one embodiment, the power component is configured to limit the speed such that the speed is less than or equal to a predetermined maximum speed (corresponding to SLS or SSR).

[0075] According to at least one embodiment, the power component is configured to limit the speed such that the speed is greater than or equal to a predetermined minimum speed (corresponding to SSM or SSR).

[0076] According to at least one embodiment, the power component is configured to activate further safety measures when the maximum speed is exceeded or the minimum speed is not reached, particularly including STO or SS1 safety functions.

[0077] According to at least one embodiment, the at least one safety-related event includes a deviation (corresponding to SDI) from the rotational direction of the motor, the motor shaft, or another shaft of the switching device from a predetermined rated rotational direction.

[0078] According to at least one embodiment, the direction of rotation is detected by a feedback system, particularly an encoder device of the feedback system, such as an absolute encoder.

[0079] According to at least one embodiment, the control unit is configured to generate control signals based on feedback signals.

[0080] According to at least one embodiment, the at least one safety-related event occurs when the absolute position of the motor shaft or the other shaft is below a predetermined minimum position or above a predetermined maximum position (corresponding to SLP).

[0081] According to at least one embodiment, at least one safety-related event occurs when a first value and a second value of the absolute position of the drive shaft deviate significantly from each other. For this purpose, the control unit can compare the first value and the second value of the absolute position of the drive shaft. Attached Figure Description

[0082] The invention is described in detail below with reference to the accompanying drawings and exemplary embodiments. Components that are identical, functionally identical, or have the same function may have the same reference numerals. Identical components or components with the same function may be explained only with respect to the drawing in which they first appear. They are not necessarily repeated in subsequent drawings.

[0083] The attached image is as follows:

[0084] Figure 1 A schematic diagram illustrating an exemplary embodiment of the switching device according to the improved scheme is shown; and

[0085] Figure 2 A schematic diagram showing another exemplary embodiment of the switching device according to the improved scheme is shown. Detailed Implementation

[0086] Figure 1 The diagram illustrates an exemplary embodiment of a switching device 1 according to an improved design, which includes a switch 17 and a servo drive system 2 connected to the switch 17 via a drive shaft 16. The servo drive system 2 includes a motor 12 that drives the drive shaft 16 via a motor shaft 14 and optionally via a transmission mechanism 15. The control unit 3 of the servo drive system 2 includes a power component 11, which includes, for example, a servo converter for controlling or regulating energy supply to the motor 12, and a control unit 10 for operating the power component 11, for example, via a bus 18.

[0087] The servo drive system 2 may have an encoder system 13, which serves as a feedback system 4 or is part of a feedback system and is connected to the power unit 11. Furthermore, the encoder system 13 is directly or indirectly connected to the drive shaft 16.

[0088] The encoder system 13 is configured to detect the position of the drive shaft 16, particularly its angular position, such as an absolute angular position, and generate a feedback signal based thereon. For this purpose, the encoder system 13 may include, for example, an absolute encoder, particularly a multi-turn absolute encoder, fixed to the drive shaft 16, the motor shaft 14, or another shaft whose position is unilaterally associated with the absolute position of the drive shaft 16. For example, the position of the drive shaft 16 may be unilaterally determined from the position of the motor shaft 14, for example, by the transmission ratio of the transmission mechanism 15.

[0089] The fixing of an absolute encoder is implemented, for example, as a combination of form-locking connections and force-locking or material-locking connections.

[0090] The feedback system also constructs a second value for detecting the position of drive shaft 16.

[0091] Therefore, the encoder system 13 can be configured to detect a second value, especially when using a different method than the method used to detect the position of the first value of the drive shaft 16.

[0092] Alternatively or additionally, the control device 3 may be configured to obtain a second value from the rotor position of the motor 12, i.e., it may actually have a virtual encoder for detecting the second value. For this purpose, for example, inductive feedback via the movement of the rotor in the motor windings of the motor 12 may be used. Since the intensity of the feedback varies periodically, the rotor position can be roughly determined, in particular, by signal analysis, such as FFT analysis. Since a full revolution of the drive shaft 16 corresponds to multiple revolutions of the rotor, the position of the drive shaft 16 can thus be inferred with very high accuracy.

[0093] The control device 3, especially the control unit 10 and / or the power component 11, is configured to control or regulate the motor 12 according to the feedback signal generated by the feedback system 4 based on the first and second values.

[0094] Control device 3, such as control unit 10, can, for example, reconcile two values ​​of the position of drive shaft 16 and / or perform a reliability check on the position determination.

[0095] The control unit 10 is implemented as a programmable safety controller and includes, for example, first and second programmable logic controllers 6 and 7. To implement switching commands for the switch, the programmable logic controllers 6 and 7 execute the program in parallel, for example.

[0096] During program execution, programmable logic controllers 6 and 7 can reconcile with each other, particularly cyclically or continuously. Reconciliation may include, for example, comparisons of calculation results, checksums, or the like.

[0097] For example, programmable logic controllers 6 and 7 include different hardware components or are implemented as different types or models.

[0098] The input and output terminals of the control unit 10 can be configured as input and output terminals for clock control. Thus, the control unit 10 can identify clock deviations, such as deviations in period duration or signal edges, based on a comparison of the input and output signals. Clock deviations can, for example, detect cross-circuiting.

[0099] Control unit 10 can identify the presence of safety-related events, such as interference or malfunction in switch 17 or the drive system. If a safety-related event is present, control unit 10 transmits a control signal to power component 11, which then initiates or implements safety measures.

[0100] Figure 2 A schematic diagram showing another exemplary embodiment of the switching device 1 according to the improved scheme is shown, which is based on... Figure 1 The implementation method.

[0101] The switching device 1 optionally includes a switch cabinet 21, within which a control unit 10, a power unit 11, and an optional human-machine interface 19 are housed. The human-machine interface 19 is connected to the control unit 10 and can be used, for example, for control, maintenance, or configuration purposes.

[0102] The motor 12, motor shaft 14, encoder system 13 and / or transmission mechanism 15 may be located inside or outside the switch cabinet 21.

[0103] The switching device 1, especially the control unit 10, is connected to the safety device 20, which includes, for example, a power switch or a circuit breaker, to disconnect the switching device 1 or the electrical operating devices associated with the switching device 1 from the energy network in the event of a failure or disturbance to the switching device 1.

[0104] The improved switching device 1 enhances the operational safety of the servo drive system, switch, and operating devices. This is achieved, in particular, through the use of a programmable safety controller as a control unit and associated redundancy, safety measures initiated by power components, and dual position determination.

[0105] List of reference numerals

[0106] 1 Switching device

[0107] 2 Servo Drive System

[0108] 3. Control device

[0109] 4. Feedback System

[0110] 6 First Processor Unit / Programmable Logic Controller

[0111] 7 Second Processor Unit / Programmable Logic Controller

[0112] 10 control units

[0113] 11 power components

[0114] 12 motors

[0115] 13 Encoder System

[0116] 14 motor shafts

[0117] 15 Transmission Mechanism

[0118] 16 drive shafts

[0119] 17 switches

[0120] 18-bus

[0121] 19 Human-Computer Interface

[0122] 20 safety devices

[0123] 21 switchgear

Claims

1. A switching device, comprising a switch (17) and a servo drive system (2) for the switch (17), the servo drive system (2) comprising: The drive shaft (16) is connected to the servo drive system (2) and the switch (17). Motor (12) for driving switch (17); Power components (11) for supplying energy to the motor (12). and Feedback system (4), which is constructed for - Determine at least two values ​​for the absolute position of the drive shaft (16); - Generate a feedback signal based on the at least two values; and Control unit (10), which is implemented as a programmable safety controller and configured for - Control the power component (11) according to at least one rated value; - The operation of the motor (12) is influenced according to the feedback signal; and - Identify the presence of at least one safety-related event and transmit at least one control signal to the power component (11) in the event of said safety-related event; Among them, the control unit (10) -Including first and second processor units (6, 7); and - Construct a program to execute a switching command for the switch (17), with the first and second processor units (6, 7) executing the program in parallel; - Constructs a mechanism for at least one reconciliation between the first and second processor units (6, 7) during program execution; - Construct a system for initiating security measures based on the result of the at least one reconciliation, wherein the security measures include: - To safely stop the motor (12), or - To block or stop the power component (11), or - Trigger the power switch that disconnects the operating device associated with switch (17) from the energy network; The power component (11) is configured to initiate or implement at least one safety measure in accordance with the control signal.

2. The switching device (1) according to claim 1, wherein, The feedback system (4) is configured to determine each of the at least two values ​​for the position of the drive shaft (16) according to the relevant method. All methods used to obtain the at least two values ​​are different from each other.

3. The switching device (1) according to claim 1 or 2, wherein, One of the at least two values ​​of the position of the drive shaft (16) is the first value of the absolute position of the drive shaft (16).

4. The switching device (1) according to claim 1 or 2, wherein, Feedback system (4) Includes an absolute encoder, which is configured and set to detect the absolute position of the drive shaft (16) or the absolute position of another shaft connected to the drive shaft (16) and generate at least one output signal based on the detected position; and Construct one of the at least two values ​​for determining the position of the drive shaft (16) based on the at least one output signal.

5. The switching device (1) according to claim 4, wherein, The absolute encoder is shaped-locked to the drive shaft (16) or the other shaft and is additionally force-locked or material-locked to the drive shaft (16) or the other shaft.

6. The switching device (1) according to claim 1, wherein, The control unit (10) constructs a comparison of the process image of the first processor unit (6) with the process image of the second processor unit (7) during program execution.

7. The switching device (1) according to claim 1 or 2, wherein, The control unit (10) is configured to check the locking conditions of two or more components of the switching device.

8. The switching device (1) according to claim 1 or 2, wherein, The control unit (10) has an input terminal and an output terminal, which are configured as either an input terminal or an output terminal for clock control.

9. The switching device (1) according to claim 8, wherein, The control unit (10) is configured to check the presence of a cross circuit based on the input signal and / or output signal that appears at the input or output terminal.

10. The switching device (1) according to claim 1 or 2, wherein, The power component (11) is configured to stop the motor (12) by means of the first safety measure of the at least one safety measure.

11. The switching device (1) according to claim 1 or 2, wherein, The power component (11) is configured to brake or stop the motor (12) in a controlled manner according to the control signal.

12. The switching device (1) according to claim 1 or 2, wherein, The power component (11) is configured to limit the speed of the motor shaft (14) of the motor (12) by means of a second safety measure of the at least one safety measure.

13. The switching device (1) according to claim 1 or 2, wherein, The switch (17) is an on-load tap changer or load switching switch or selector or double commutator or commutator or preselector or power switch or load switch or circuit breaker.

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