Control interface for medium voltage circuit breakers and switches

Abstract

A system for driving electric machines of switching units, in particular for electrical power substations, comprising control units (1000, 1001, 1002, 1003, 1004, 1005...) for controlling said electric machines, comprising means for managing the priority of the electric machines in operation, so that only one electric machine is in operation at a time, said means having a first line (1010) and a second line (1020), the first line, called parallel line, carrying binary data comprising a first state and a second state, the first state representing the stop of all electric machines and the second state representing the operation of any electric machine, said units being connected in parallel to the parallel line, said parallel line being connected to means for preventing the start of the electric machine of each unit, the second line, called series line, said units (1001, 1002, 1003,...) being connected in series to the second line in an upstream / downstream chain, said series line constituting a means for inhibiting the operation of the electric machines downstream of any electric machine on detection of a signal for starting said any electric machine, the series line being connected to means (106A, 106B, 106C) for inhibiting the operation of the electric machine of each unit.

Description

Technical Field

[0001] This invention relates more specifically to medium-voltage distribution substations and their drive systems. Medium-voltage substations typically manage currents ranging from 1000V to 50000V. For such voltages, switching units such as switches and circuit breakers must be driven by reliable and fast control devices. Generally, these switching units include operating devices equipped to relax compression springs to actuate circuit breakers or switches, or to open the cut-off mechanism of switches or circuit breakers, very quickly. Modern switching units employ electric motors for remote operation of their operating devices. These motors allow for the installation of operating devices, are typically supplied with voltages between 24V and 48V, and consume a significant amount of current during operation.

[0002] In substations, these motors are typically powered by UPS (Uninterruptible Power Supply) inverters to ensure continued operation even if the power network is interrupted. Motor startup involves current peaks, and starting multiple motors simultaneously would require powerful, bulky, and expensive inverters. To reduce size and cost, inverters are designed to control only one motor at a time and provide a system to ensure that all motors are always controlled sequentially. Background Technology

[0003] One known solution for ensuring this system sequencing of motor startup involves a control board with a microcontroller in each functional unit, and a communication network between the motor control functional unit and the control board (e.g., a network with a protocol called "MODBUS," where each motor and its control unit has a unique address). The microcontroller manages the timing between motor start commands. This setup is expensive because it requires master-slave electronic management, necessitating a computerized circuit board for each functional unit and a larger enclosure. Furthermore, the potential causes of failure are increased.

[0004] The goal is to implement a cheaper and more decentralized solution for the sequential starting of motors. Summary of the Invention

[0005] Therefore, the present invention relates to a system for driving motors of operating switch units, particularly for power supply substations, including a control unit for controlling the motors. To ensure that only one of the motors is running at a time, the system includes means for managing motor operating priorities, having a first line and a second line. The first line, referred to as a parallel line, carries binary data including a first state indicating all motors are stopped and a second state indicating any one motor is running. Units are connected in parallel to the first line, which is connected to means for preventing the motor of each unit from starting. The second line, referred to as a series line, has units connected in series in an upstream / downstream chain. The series line constitutes a device for prohibiting the operation of motors downstream of any one motor when a signal for starting any one motor is detected. The series line is connected to means for prohibiting the operation of the motor of each unit.

[0006] In other words, the present invention relates to a system for driving a motor to operate a switching unit, the system including a control unit for said motor. To operate only one motor at a time, an apparatus for managing motor operating priorities is provided:

[0007] Having a first line, called a parallel line, is configured to transmit binary data, which corresponds to:

[0008] In the first state, all motors are stopped;

[0009] In the second state, any one of the motors is running.

[0010] It has a second line, called a series line, configured to transmit data associated with each control unit, specifically binary data, which corresponds to:

[0011] In the first state, none of the motors upstream of the motor of the control unit have received a start command and / or are running;

[0012] In the second state, the motor upstream of the motor of the control unit has received a start command and / or is running.

[0013] Starting a particular motor is only possible when the binary data on the parallel and series lines associated with the motor's control unit are in the first state, respectively.

[0014] More specifically, devices for preventing the motor of each unit from starting are connected in parallel to a parallel line. Devices for disabling the motor of each unit are connected in series to a series line in the upstream / downstream chain.

[0015] To control and manage the priority of the motor control unit, the system uses two simple lines, requiring no computer protocols or series or parallel network management components at the control unit level. This simplifies the operation of the unit and associated control devices and avoids the need to reprogram the unit when it may be added or removed.

[0016] The device for preventing the motor from starting and disabling its operation can be manufactured using wired logic or embodied in a system with a programmable microcontroller or microprocessor system having inputs for detecting line status and for driving power relays to control the motor output.

[0017] The features disclosed in the following paragraphs may be implemented optionally. They may be implemented independently or in combination:

[0018] Each unit may include a logic device for placing a first parallel line in a second state indicating the operation of its motor before the motor in that unit enters operation, the second state activating means for preventing the starting of motors in other units, the logic device also including a means for returning the parallel line to the first state at the unit level when the motor stops.

[0019] This allows units to be linked together directly without considering the number of units present in the substation.

[0020] Each unit may include a switching device for switching series lines, which is configured to switch series lines when a command to start the motor of the unit is received. The switching of series lines by the upstream unit constitutes a signal to start the motor of the upstream unit, and activates a device to prohibit the operation of the motor of the downstream unit relative to the upstream unit. The switching device is also configured to return the series lines to the initial state of being horizontal at the upstream unit when the motor stops.

[0021] Each unit may include wired or programmable timing logic for activating and deactivating the start-up of its motor and for managing the series and parallel lines.

[0022] Each unit may include circuitry or sequence for disabling its means of preventing motor startup when its own motor startup is detected.

[0023] The priority between units is determined by the position of the units, from upstream to downstream, such as from left to right in a housing.

[0024] These units may include timing logic for controlling the operation of their motors, the timing logic including or driving one or more means for controlling power relays to provide current to the motors in the opening and closing directions of the switching units; at least one means for preventing the motors from starting; and at least one means for disabling the operation of the motors of the priority management devices.

[0025] This makes it possible to produce simple units without digital components, which are easy to implement and maintain.

[0026] The timing logic may be configured with a first stage, which includes a first circuit for preventing / allowing the motor to run in the closing direction of the switching unit, the first circuit being configured to prevent the motor from running in the closing direction of the switching unit when a command to operate the motor of the switching unit in the opening direction of the switching unit is detected.

[0027] This constitutes a safety feature that prioritizes the switching of the controlled circuit over its operation.

[0028] The timing logic may be configured with a second level, which includes at least one device for preventing motor startup. This device is provided with a second control device driven by an input for receiving binary data verified by a prevention / enable circuit. The prevention / enable circuit is configured to block the passage of binary data when the motor to be started or run is a motor belonging to the unit, and to allow the passage of binary data when the motor to be started or run is a motor outside the unit.

[0029] This allows the unit's motor to run when the start command comes from its unit.

[0030] The sequential logic can be configured with a third level for managing parallel and series lines.

[0031] When a unit starts its motor, the stage switches the series circuit downstream.

[0032] The timing logic may include at least one power control stage, which has at least one pair of power switches for providing current for operating the motor in the off direction of the switching unit and for providing current for operating the motor in the closed direction of the switching unit.

[0033] According to this example, the power switch is schematically shown as an electromechanical relay, but relays in the form of IGBT semiconductors, contactors, or other components can be used.

[0034] The timing logic can be configured with at least a fourth level, which includes one or more third circuits for preventing / allowing the motor to run when motor parameters are detected.

[0035] This allows for the consideration of faults such as grounding failures, cover openings, or other malfunctions to prevent motor operation.

[0036] The control unit can be configured such that, upon receiving a level indicating the operation of a motor outside the unit on the parallel line, the second control device switches a signal to control the operation of the motor at the level of the device, so as to prevent the motor from starting in the opening direction of the switching unit and the closing direction of the switching unit.

[0037] At least some of the control device, the circuit for preventing / allowing motor operation, the device for preventing motor starting, and the device for prohibiting motor operation can be formed by signal switching relays. These relays can be electromechanical or static semiconductor relays, such as analog switches.

[0038] In the case of electromechanical relays, one of the fourth-level control devices may include an input of a travel end sensor for disconnecting the switch unit connected to the coil to control the disconnection of the first relay to prevent / allow the motor to run in the disconnection direction of the switch unit so as to stop the motor when the disconnection of the switch unit ends, and an input of a travel end sensor for closing the switch unit connected to the coil of the second relay to prevent / allow the motor to run in the closing direction of the switch unit so as to stop the motor when the closing of the switch unit ends.

[0039] The unit may include circuitry for bypassing a means of preventing motor startup activated by circuitry (4C) for detecting the operation of the motor of the control unit.

[0040] This avoids switching the motor of the unit whose command is valid.

[0041] The unit may include a relay for allowing motor operation, the coil of which is connected to an input for receiving an authorization signal that detects motor operation.

[0042] The unit may include a relay for enabling / preventing operation, the coil of which is connected to an input for receiving a signal that detects the grounding of the medium-voltage switch.

[0043] The third level of the unit may include an authorized level for controlling motor operation in the presence of an upstream connection to a series line.

[0044] When an upstream connection exists, during the period when the operation of the motor in the unit is to be transmitted to other units, the controller of the authorized operation controls the relay (which closes to control the cold point power supply of the motor's power relay coil) and closes the relay to set the parallel line to zero.

[0045] In the event of an upstream line disconnection, the controller in authorized operation disconnects the cold-point power supply to the power relay coil used to control the motor, disconnects the relay that sets the parallel line to zero, thereby preventing the motor from running and setting the parallel line to zero.

[0046] Sequential logic can advantageously use the switching time of signal switching relays for timing. Attached Figure Description

[0047] Other features, details, and advantages of the invention will become apparent upon reading the following description and examining the accompanying drawings, wherein:

[0048] Figure 1 A simplified schematic diagram of the motor control unit according to this specification is shown.

[0049] Figure 2 A simplified diagram illustrating an example of a link of multiple control units connected in parallel according to this specification.

[0050] Figure 3 A simplified diagram illustrating an example of a series connection of multiple control units according to this specification is shown.

[0051] Figure 4 A flowchart is shown that illustrates the wired or programmable timing logic applicable to this invention.

[0052] Figure 5 A schematic diagram of a device with a microprocessor is shown. Detailed Implementation

[0053] The following figures and description largely contain elements that not only serve to better illustrate the invention, but also, where appropriate, contribute to its definition.

[0054] This invention relates to "intelligent" medium-voltage substations, which include multiple switching units, such as circuit breakers or medium-voltage switches driven by an external interface.

[0055] Medium voltage is typically between 1000V and 50000V. Switching units are typically 600A to 1250A circuit breakers or switches used for secondary power distribution.

[0056] The switching unit includes a motor that switches the contacts of the switching unit and allows the cutter to open very quickly to reduce or eliminate the electric arc.

[0057] Operation can be based on the compression of a spring, which, when released, allows for a sudden switching of the cutter after passing the equilibrium point for the switching unit, such as what the applicant calls CDT, or in the device for storing energy in the closed switch to equip a re-opening spring for the switching unit, which the applicant calls CD1 or CD2.

[0058] Such substations, driven by 24 / 7 remote control, typically include small inverters that can only power one switching unit motor at a time.

[0059] Some switching units that store energy for their switching require automatic motor restarting when they need to be reloaded. This is especially true during substation installation and in certain fault conditions, where there may be simultaneous requests to reload switching units, and the inverter cannot deliver peak current to multiple motors.

[0060] Each switch has its own motor and its control unit in the form of an electronic or electrical circuit board, which includes inputs for sensors or microswitches to allow or prevent the operation of a power relay to control the motor based on the presence or absence of a motor operation command and the presence or absence of a fault in the switch unit.

[0061] A substation typically consists of three to dozens of units.

[0062] In the context of this invention applied to relay systems, the fact that motor control power relays have a response time of approximately 5 to 20 ms is taken into consideration, which is longer than the response time of control logic, such as relay control logic, whose response time is not on the order of 3 ms.

[0063] This allows a unit that receives a command to start its motor to transmit a "synchronization" signal to other units after its power relay switches but before it actually starts its motor, and to stop the sequence of starting its motor when it receives a synchronization signal from a third-party unit before actually starting the motor.

[0064] As will be seen below, one principle of this specification is the use of parallel lines connected to a device for preventing the motor of each unit from starting and a second series line connected to a device for disabling the operation of the motor of each unit.

[0065] Figure 1 An exemplary control unit 1000 for operating at least one motor of a switching unit is shown. This switching unit includes timing logic with relays for controlling the operation of the motor. The principles employed are similarly applicable to motors controlling circuit breakers or switches.

[0066] The principle of the timing logic described for a switch includes a cascade of signal switch relays with a first level 1, the first level 1 including a first relay for preventing the operation of closing the switch unit when a priority disconnect command is sent.

[0067] The first stage includes a first 100A coil, and when a command to disconnect the switching unit is detected, supplying power to the first 100A coil switches the circuit 100B of the first relay.

[0068] If this unit receives a signal powered by another unit, the second stage 2 will prevent the motor from operating.

[0069] The second stage is equipped with at least two second relays 101B and 101C for disabling motors equipped with a second coil 101A, which is powered by an input 21 that receives signals from motors outside the operating unit.

[0070] The unit also includes third-level 3A and 3B for verifying the operation of the motor, which is equipped with relays 102B, 102C, 103B, and 103C and has inputs for opening the end-of-stroke signal 31 and closing the end-of-stroke signal 32 to stop the motor when the end of the stroke is reached.

[0071] According to this example, the unit also includes at least fourth levels 4A, 4B, which are provided with one or more fourth relays to prevent operation when a condition for preventing motor operation, such as a grounded medium-voltage switch, is detected.

[0072] The control unit includes at least one power relay for supplying current to the motor in the closing direction of the switch, embodied here by a dual relay 200B, and at least one power relay for supplying current to the motor in the opening direction of the switch, embodied here by a dual relay 202B. According to this example, the unit includes series relays 200B and 201B for opening the switch and series relays 202B and 203B for closing the switch to reduce arcing during motor startup and shutdown.

[0073] These relays receive power supplies DB+ and DB- and control the motor power supply voltages M+ and M-, which are used to power the motor 740 to control the switching unit 741.

[0074] Finally, this unit includes motor priority management levels 4C and 4D, as seen below.

[0075] In order to manage the operation of only one motor at a time in a substation that includes multiple switching units, this specification proposes a device for managing motor operation priority, which includes a first line 1010 and a second line 1020.

[0076] Figure 2The first line 1010, referred to as the parallel line or PWU, is shown. This line carries binary data, including a first state representing all motors stopped and a second state representing any one motor running. In this specification, the first state is the "disconnected" state, and the second state is the line set to zero; of course, the reverse logic is also possible. "Carries binary data" means that the line is configured to transmit that binary data. "The second state representing any one motor running" means that any one motor is running, especially after receiving a start command.

[0077] Therefore, the first line is configured to transmit the same binary data to all motor control units, the binary data corresponding to any of the following:

[0078] - In the first state, all motors are stationary, or

[0079] - Second state, any one of the motors is running.

[0080] Still based on Figure 2 Units 1001, 1002, 1003, 1004, 1005, ... of the substation are connected in parallel on line 1010. This parallel line is connected to a device for preventing the motor of each unit from starting, including relays 106B for each unit's priority management level 4D, specifically relays 106B1 to 106B5 in this example. These relays allow the line to be set to zero during a command to start the unit's motor. This circuit... Figure 1 As can be seen from reference numeral 106B in the accompanying drawings, and when the control signal is valid at the level of relay 105A, the control coil 106A of relay 106B will be activated during the command to start the unit motor.

[0081] The circuit is also connected to a circuit for enabling / stopping motor operation of the unit via a relay 105C1, shown only for unit 1001 (to avoid over-illuminating the diagram). This relay can... Figure 1 As seen under reference numeral 105C in the attached figure, it is controlled by coil 105A. Coil 105A will allow signal PWU45 to switch to PWU_V1 46 to prevent the motor of this unit from starting when the motor of another unit is working. At the same time, coil 105A switches the connection between signal PWU and signal PWU_V1 when the motor of this unit is starting.

[0082] When the motor of the unit starts, line PWU 1010 is thus set to zero and the corresponding input 21 of the device used to prevent the unit from starting is deactivated.

[0083] The second line, 1020, is called the series line and... Figure 3The diagram shows a circuit used to prevent operation of a motor downstream of any one of the motors when a start signal from any one of the motors is detected.

[0084] Therefore, the second line is configured to transmit data associated with each motor control unit, specifically binary data, which corresponds to:

[0085] - In the first state, none of the motors upstream of the control unit's motor have received a start command and / or are running, or

[0086] - Second state: The motor upstream of the motor of the control unit has received a start command and / or is running.

[0087] This allows the motors to be started preferentially from upstream to downstream, meaning the sequence always starts with the upstream motor and follows a cascading sequence downstream.

[0088] like Figure 3 As shown, the series circuit includes an upstream terminal 1020a set to zero, and a switching relay 107B passing through each downstream unit 1001 to downstream units 1002, 1003, ... . Figure 1 The hot spot of the control coil 107A of the switch relay 107B is connected to the motor control of the corresponding unit, while its cold spot is connected to the series circuit through the unidirectional diode D3.

[0089] Therefore, according to Figure 1 and 3 :

[0090] a. The upstream series line SYNL 43 is switched by the upstream unit, and the cold spots of coils 107A and 106A are not powered. This will prevent:

[0091] i. Switch the downstream series line SYNR 44 at the level of relay 107B;

[0092] ii. Start the motor at the horizontal position of relays 106B and 106C controlled by coil 106A;

[0093] iii. Bypass the blockage to operation PWU_V 21 at the level of relay 107C using signal MEM_DI1 48; or

[0094] b. The upstream series line SYNL43 is activated, and:

[0095] i. When the corresponding command of the unit motor reaches the hot spot of coil 107A, relay 107B allows the switching of the downstream series line SYNR 44;

[0096] ii. Relay 106B can set the PWU of the parallel line to zero;

[0097] iii. Relay 106C can control the starting of the motor.

[0098] Therefore, each unit includes logic devices or control levels 106A, 106B for placing a first parallel line in a second state representing the operation of its motor in response to the operation of the unit's motor. The second state activates a device to prevent other unit motors from starting.

[0099] Return to Figure 1 Control stage 106A constitutes a stage for allowing motor operation in the presence of an upstream connection 43 to the series line. In the presence of an upstream connection, the command to operate the motor closes relay 106C, which verifies the cold spot supply to the coils 200A, 201A, 202A, and 203A of the motor control power relays, and the command to operate the motor closes relay 106B, which sets the parallel line PWU 1010 to terminal 47, during motor operation in the unit, to transmit this information to other units.

[0100] If the upstream connection is disconnected, power cannot be supplied to relay 106A, which causes relay 106B to disconnect and prevent power from being supplied to relay 106C, thereby preventing the motor from starting.

[0101] Command 107A then disconnects the series connection to downstream SYNR 44 at the level of relay 107B during motor operation of the unit.

[0102] In addition, the unit also includes means for clearing the parallel circuit when the motor stops via relay 105B, which opens relay 106B as the input of the hot spot of coil 106A changes when the motor stops (e.g., when end-of-travel contact 31 or 32 is activated).

[0103] The sequence used to start the motor may include the following verification steps:

[0104] - Verify that the PWU has high impedance at the input level 21PWU_V1.

[0105] - Verify motor operation at the levels of the end-of-stroke contacts CCVAJ, OCV inputs 31 and 32, and at the level of input 42 where the microswitches are combined, for example, by grounding the medium-voltage switch ESOV.

[0106] - Open the contact between PWUV and PWUVl at the horizontal position of relay 105C to stop the PWU high impedance verification.

[0107] - If the cell's SYNL is 0V, meaning there are no upstream cells running:

[0108] a. Allows the power relay to be driven at the level of the relay 106C controlled by coil 106A;

[0109] b. Set the parallel line PWU to 0V at the level of relay 106B;

[0110] c. Set the downstream series line SYNR and relay 107B to high impedance to switch the power supply to the downstream interface;

[0111] d. As long as the motor is powered on, the test for connecting PWU_V and contact 105C is bypassed.

[0112] Once the command ends, the parallel line PWU returns to high impedance at the level of relay 106B, and the downstream line SYNR is reconnected to the upstream line SYNL at the level of relay 107B. At the same time, the signal MEM_DI is deactivated and the control of the power relay is reopened at the level of relay 106C.

[0113] Therefore, the upstream series line SYNL entering the unit at the level of upstream connection 43 and the downstream series line SYNR exiting the unit at the level of connection 44 thus allow for the priority of motor operation from upstream to downstream.

[0114] If two units receive commands simultaneously, the upstream unit gains power and the downstream unit loses power.

[0115] PWU enables the unit to notify that power to the unit motor is in use, which allows starting commands from other units to be ignored.

[0116] In this example, the series connection is connected to 0V when the motor is allowed to run, and to a high impedance in the opposite case. However, it is conceivable to create a circuit where the operating signal of the upstream unit will be at a non-zero voltage.

[0117] In this example, if one of the motors is in use, the parallel line PWU is connected to 0V; if no motor is in use, the parallel line PWU is at high impedance. Other configurations are also possible within the scope of this invention.

[0118] Figure 4 The operation sequence applicable to the wired or programmed logic of this invention is represented in the form of a flowchart.

[0119] Specifically, according to the present invention, Figure 1The wired logic in the example can be replaced by a circuit board, such as a circuit board with a microprocessor or microcontroller that has sensor inputs, such as special switches, such as interlock switches, which prevent the motor from starting under abnormal conditions, such as when the housing is opened or the medium-voltage switch is grounded; inputs to the motor travel end sensor; inputs / outputs for managing the parallel line 1010 and the series line 1020; and outputs of power relays 200, 201, 202, and 203 for controlling the motor.

[0120] In this case, the microprocessor or microcontroller includes motor control software, which will... Figure 4 A simplified example of sequential logic 500 (which is also applicable to) Figures 1 to 3 The wired system executes the sequence required to operate the motor and positions the series and parallel lines in the desired state.

[0121] In this context, Figure 4 The operation sequence initiated by motor activation command 510 is shown. Once this command is received, the test sequence is initiated.

[0122] The sequence includes:

[0123] - Step 520, in which the location of the parallel line is tested to verify whether the PWM motor use signal of the parallel line 1010 is present.

[0124] - Step 530, in which the positioning of the interlock switch is tested to ensure the correct operation of the motor associated with the board;

[0125] - Third step 540, in which the synchronization signal 1020 from the upstream module is verified to be present.

[0126] If all these steps are positive, then in step 550, the unit in question puts the motor signal of the parallel line 1010 into use, in step 560 disables the synchronization signal of the series connection 1020 for the downstream unit, in step 570 starts the motor, and then in step 580 tests whether the command has ended.

[0127] When the command has been verified to be finished, the software triggers the motor to stop in step 590, sets the PWM signal of parallel line 0 to the clear state in step 600, reverifies the synchronization signal for the downstream unit in step 610, and then the sequence ends in the closing step 620b to return to waiting for the activation command.

[0128] Instead, while the command is still in progress, a portion of the loop is executed again to test for defects, specifically making it possible to interrupt the process by stopping the motor.

[0129] Figure 5A controller device 700 with a microprocessor or microcontroller is schematically shown. At 710, an interlock switch is connected to the controller input. Parallel and series connections are connected to the controller input via isolation components 1021 and 1061. The parallel connection is connected to the controller output via a first relay or analog switch 1060. The series connection 1020 is connected to the controller output via a second relay or transistor. A signal for controlling motor start is at the controller input 711. Outputs 712 and 713 drive relays 720 and 730, which are similar to... Figure 1 Relays 200, ..., 203 are used to drive motor 740.

[0130] This invention is not limited to the examples described above. In particular, as seen above, the principle of this invention, in which two wired lines connect the motor control unit to the timing logic, can be applied to systems that use digital circuit boards with microprocessors, microcontrollers, or programmable logic to generate timing logic instead of relays.

Claims

1. A system for driving a motor of an operating switch unit, the system comprising a control unit for controlling the motor, characterized in that, The system includes a device for managing motor operation priorities, so that only one motor is running at a time. This device has a first line and a second line. The first line, called a parallel line, carries binary data including a first state and a second state. The first state represents all motors stopped, and the second state represents any one motor running. These units are connected in parallel to the parallel line, which is connected to a device for preventing the motor of each unit from starting. The second line, called a series line, has units connected in series in an upstream or downstream chain. The series line constitutes a device that prevents the motor downstream of any one motor from running when a signal for starting any one motor is detected. These units are connected in series to the second line, which is connected to a device for preventing the motor of each unit from running.

2. The system for driving the motor of the operating switch unit according to claim 1, wherein each unit includes a logic device for placing a first parallel line in a second state before the motor of the unit enters operation, the second state representing that its motor is in operation, the second state activating means for preventing the motors of other units from starting, the logic device further including a device for returning the parallel line to the first state at the unit when the motor stops.

3. The system for driving a motor of an operating switch unit according to claim 1 or 2, wherein each unit includes a switching device for switching a series line, the switching device being wired such that when a command to start the motor of the unit is received, the series line is switched, the switching of the series line by the upstream unit constitutes a signal for starting the motor of the upstream unit, which activates a means to prohibit the operation of a motor of a downstream unit relative to the upstream unit, the switching device being further configured to return the series line to its initial state at the upstream unit when the motor stops.

4. The system for driving a motor of an operating switch unit according to claim 3, wherein each unit includes wired or programmable timing logic for activating and deactivating the start-up of its motor and for managing the series and parallel lines.

5. The system for driving the motor of the operating switch unit according to claim 4, wherein each unit includes circuitry for disabling means for preventing starting when its own motor is detected to be starting.

6. A unit for controlling at least one motor of an operating switch unit, wherein the control unit is designed to be connected to a system for driving the motor of the operating switch unit according to any one of the preceding claims, characterized in that... The unit includes timing logic for controlling the operation of the motor, the timing logic including or driving one or more means for controlling a power relay to provide current to the motor in the opening and closing directions of the switching unit; At least one device for preventing motor starting and at least one device for disabling the operation of the motor of the priority management device.

7. The unit for controlling at least one motor of the operating switch unit according to claim 6, wherein the timing logic has: - First stage, including first circuitry for preventing / allowing the motor to run in the closing direction of the switching unit, the first stage having a first control device for preventing the motor from running in the closing direction of the switching unit when a command is received to run the motor of the switching unit in the opening direction of the switching unit is received; - The second stage includes a device for preventing motor starting. The second stage has a second control device driven by an input that receives binary data verified by a prevention / allowance circuit. The prevention / allowance circuit is configured to block the passage of binary data when the motor to be started or run is a motor belonging to the unit, and to allow the passage of binary data when the motor to be started or run is a motor outside the unit. - The third level is used to manage parallel and series lines. - At least one power control stage having at least one pair of switches for providing current to operate the motor in the open direction of the switching unit and for providing current to operate the motor in the closed direction of the switching unit.

8. The unit for controlling at least one motor of the operating switch unit according to claim 7, wherein the timing logic has at least a fourth level, the fourth level being provided with one or more third circuits for preventing / allowing motor operation when motor parameters are detected.

9. The unit for controlling at least one motor of the operating switch unit according to claim 7, wherein, When the second control device receives a signal indicating the operating level of a motor outside the unit on the parallel line, it switches the signal for controlling motor operation between the device for preventing motor starting in the opening direction of the switching unit and the closing direction of the switching unit.

10. The unit for controlling at least one motor of the operating switch unit according to any one of claims 7 to 9, wherein at least one of the control device, the circuit for preventing / allowing motor operation, the device for preventing motor starting, and the device for prohibiting motor operation is constituted by a signal switch relay.

11. The unit for controlling at least one motor of the operating switch unit according to claim 10, wherein, One of the fourth-level control devices includes an input for a stroke end sensor, for disconnecting a switching unit connected to the coil to control the disconnection of a first relay to prevent / allow the motor to run in the disconnection direction of the switching unit so as to stop the motor when the disconnection of the switching unit ends; and an input for a stroke end sensor, for closing a switching unit connected to the coil of a second relay to prevent / allow the motor to run in the closing direction of the switching unit so as to stop the motor when the closing of the switching unit ends.

12. The unit for controlling at least one motor of the operating switch unit according to claim 11, comprising circuitry for bypassing means for preventing motor start-up activated by circuitry of the detection control unit for motor operation.

13. The unit for controlling at least one motor of the operating switch unit according to claim 12, comprising a relay for allowing operation of the motor, the coil of which is connected to an input for receiving an authorized signal for detecting motor operation.

14. The unit for controlling at least one motor of the operating switch unit according to claim 13, comprising a relay for enabling / preventing operation, the coil of which is connected to an input for receiving a signal for detecting grounding of the intermediate voltage switch.

15. The unit for controlling at least one motor of the operating switch unit according to claim 14, wherein, The third level includes an authorized level for controlling motor operation in the presence of an upstream connection to a series line.

16. The unit for controlling at least one motor of the operating switch unit according to claim 15, wherein, In the presence of an upstream connection, during the transmission of motor operation from one unit to another, the controller for authorized operation controls the closure of a relay for supplying cold-point power to the motor's power relay coil, and closes a relay that sets the parallel line to zero.

17. The unit for controlling at least one motor of the operating switch unit according to claim 16, characterized in that, It is timed by the switching time of the signal switch relay.

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