ELECTRICAL actuating system for motorized valve

Abstract

An electrical actuation system (11) for a motorized valve (1) includes switching means (14) for establishing, maintaining, and then interrupting a power supply to a valve motor (3). The switching means include insulated-gate bipolar transistors (IGBTs) arranged to connect an electrical voltage source (20) to the power supply terminals (31, 32, 33) of the valve motor (3), and control means (15) connected to the gates of the insulated-gate bipolar transistors. Such an embodiment of the switching means reduces the excessive stresses experienced by the valve and consequently reduces wear on the valve. The system may advantageously further include an electrical dissipation circuit (16) for stopping the motor rotation even more quickly, providing a further reduction in excessive stresses. (Shorthand figure: Figure 3)

Description

Title of the invention: ELECTRICAL ACTUATION SYSTEM FOR MOTORIZED VALVE technical field

[0001] This description relates to an electrical actuation system for a motorized valve, as well as equipment for controlling a fluid flow. Throughout this description, the term "valve" refers both to a binary-state device for allowing or blocking fluid flow, and to a continuously opening valve for adjusting the flow rate. Furthermore, the acronym IGBT stands for insulated-gate bipolar transistor, which is a semiconductor component well known to those skilled in the art. Previous technique

[0002] Certain applications use valves that require precautions for use. This is the case, for example, with valves used in a nuclear power plant, particularly valves in the primary fluid circuit of the nuclear reactor. As shown in [Fig. 1], such a valve, designated globally by reference numeral 1, comprises a gate 2 for reversibly closing a conduit 10 containing the fluid flow, a servomotor 3, and a mechanical coupling system 4 that transmits the actuation motion produced by the servomotor to the gate. The mechanical coupling system itself comprises a fixed support 5, called a yoke, which rigidly connects the stator of the servomotor to the fluid conduit, and moving drive elements such as a valve stem 6 and a drive coupler 7 that converts the rotation of the servomotor rotor into movement of the valve stem.

[0003] When such a valve is electrically actuated, to close or open it, parts of this valve, in particular its mechanical coupling system, are subjected to an overstress when the rotation of the servomotor stops with a delay relative to the stop command time. This delay has several origins, including a delay in the opening of a contactor used to control the power supply to the valve's servomotor, the rotational inertia of the servomotor rotor, and the self-induction of the servomotor coils. The contactor opening delay is intrinsic to its electromechanical operation. It is due in particular to the inertia of internal moving parts of the contactor that establish and break the power supply contact, the stiffness of internal springs in the contactor, and the self-inductive behavior of a contactor coil. The diagram in [Fig.2] shows the variation in the relative intensity of the over-stress which is experienced by the valve during . of the interruption of the power supply to its servomotor, as a function of the contactor opening delay. The vertical axis represents the relative intensity of the over-stress, denoted T and expressed as a percentage, and the horizontal axis represents the values ​​of the contactor opening delay, denoted R and expressed in seconds (s). Typically, a contactor opening delay of 60 ms (milliseconds) causes an over-stress of approximately 14%. The variation of the relative intensity of the over-stress as a function of the contactor opening delay is almost linear, with a small additional parabolic component. Successive actuations of the valve, each repeating the over-stress, cause premature wear of the valve, or even its failure, most often a failure of its mechanical coupling system. To reduce the over-stress experienced by the valve, at least one strain sensor 8 (see [Fig.l]) is usually located on critical parts of the valve, for example its mechanical coupling system 4 and / or on a stop at the end of the stroke of the obturator 2. It is then important to be able to interrupt a rotation in progress of the servomotor of the strain-sensing valve with a delay that is minimal relative to the instant at which an over-force is detected.

[0004] Reference numeral 11 in [Fig. 1] designates an electrical power module used to supply power to the valve 1 from an electrical voltage source 20. This power module 11 contains the contactor mentioned above and designated by reference numeral 13, a control circuit 15 for this contactor, a protection circuit 16 for the servomotor 3 against overvoltages, and a digital control card 17 for shut-off. The power module 11 may be in a power drawer format for insertion into an electrical cabinet. A stress amplitude measurement signal is then transmitted by each stress sensor 8 to the control circuit 15, so that the latter triggers a shutdown of the servomotor's power supply if the measured stress is too high.

[0005] To date, the fastest electromechanical contactors have opening delay values ​​on the order of 20 ms. These values ​​are too high for many applications of overtravel sensor valves, particularly for such valves used in a nuclear power plant. It is therefore necessary to increase the frequency of verification and maintenance of these valves to achieve the required level of reliability. Technical problem

[0006] From this situation, one object of the present invention is to increase the life of a motorized valve which is electrically operated, in particular a motorized valve with a strain sensor.

[0007] A complementary object of the invention is to reduce an over-stress which is suffered by the motorized valve when it is actuated.

[0008] Another object of the invention is to shorten a power supply cut-off delay which occurs in the control of a motorized valve.

[0009] Another object of the invention is to dissipate energy contained in a running motor in order to stop the motor's rotation more quickly. Summary of the invention

[0010] To achieve at least one of these objectives, or another, a first aspect of the invention proposes a novel electrical actuation system for a motorized valve, comprising switching means for establishing, maintaining, and then interrupting a power supply to a valve motor from an electrical voltage source, and control means adapted for activating the switching means. According to the invention, the switching means comprise insulated-gate bipolar transistors, or IGBTs, which are arranged to electrically connect, during use of the system to actuate the valve, the electrical voltage source to the power supply terminals of the valve motor through electrical conduction paths of the insulated-gate bipolar transistors. Furthermore, electrical outputs of the control means are connected to the gates of the insulated-gate bipolar transistors.

[0011] Thus, the control means control the establishment, maintenance, and then termination of the electrical power supply to the valve motor from the power source, via IGBT transistors, replacing the electromechanical contactor used prior to the invention. Thanks to this, the time it takes to disconnect the power supply to the valve motor depends on the switching speed of the IGBT transistors and can therefore be significantly reduced, particularly to values ​​on the order of 0.15 ms. The power supply can thus be cut off more quickly as soon as an overload is detected in the valve, preventing this overload from persisting before the power supply is effectively cut off. Wear on the valve is thus reduced by the electrical actuation system of the invention, and the valve's service life is consequently increased.

[0012] In possible embodiments of the invention, the system of the invention can be adapted for an AC-type electrical voltage source, and such that, during the use of this system, terminals of the electrical voltage source are connected one by one to the power supply terminals of the valve motor through the electrical conduction paths of two insulated-gate bipolar transistors that are connected in series with opposite directions of conduction within separate switching branches. For such embodiments, the system further comprises a respective diode for each of the two insulated-gate bipolar transistors of each switching branch, this diode being connected in parallel with the corresponding insulated-gate bipolar transistor so that this insulated-gate bipolar transistor and this diode have opposite conduction directions.

[0013] Preferably, the system of the invention can be arranged and sized to be inserted into an electrical power distribution cabinet, in particular in the form of a power drawer which is wired to supply the valve motor with three-phase electrical power at 380 V (volt) interphase voltage, suitable for operating the valve.

[0014] In preferred embodiments of the electrical actuation system of the invention, this system may further include a dissipation circuit arranged to be connected to the power supply terminals of the valve motor, in parallel with the motor's coils. This dissipation circuit is adapted to electrically absorb at least a portion of the energy released by the motor when its power supply is interrupted. In other words, the dissipation circuit allows the motor to stop rotating even more quickly, thus providing a further reduction in stress.

[0015] According to a possible and advantageous configuration of the electrical dissipation circuit, it may comprise: - diode rectifier bridge branches, one rectifier bridge branch per motor power supply terminal; - a branch with a voltage limiting function, preferably including a Zener diode; - at least one branch with a capacitive braking function, including a capacitor; - at least one discharge branch including a discharge resistor; and - at least one branch with a resistive braking function, including a braking resistor and a controlled switch which is connected in series with the braking resistor to control resistive braking operation.

[0016] Generally, for the invention, the system may further comprise a digital circuit adapted to transmit power-on and power-off commands to the control means, and to receive feedback signals relating to the execution of each of these commands, and preferably also signals indicating electrical currents transmitted to the valve motor that exceed a limit. When a power dissipation circuit is used, the digital circuit may further be adapted to control the operation of the power dissipation circuit each time the power supply to the valve motor is interrupted.

[0017] Also, generally for the invention, the control means can be further adapted to receive stress measurement signals which are transmitted by at least one valve strain sensor during system operation to actuate the valve and to control the switching means to interrupt the power supply to the valve motor when the measurement signals indicate strains exceeding a threshold. This prevents excessive strain on the valve. In particular, the operation of the electrical dissipation circuit can advantageously be controlled by the digital circuit when the measurement signals indicate that the measured strains exceed the threshold.

[0018] More generally, for the invention, the control means, and the digital circuit if applicable, can preferably be made up of non-programmable components, without programmable components. System qualification monitoring is thus simplified, since it can be limited to an initial qualification procedure. Such a precaution is particularly advantageous when the qualification requirement is strict, as is the case, in particular, for an application of the invention in a nuclear power plant.

[0019] A second aspect of the invention provides equipment for controlling a fluid flow, which includes: - a source of electrical voltage; - a system that conforms to the first aspect of the invention; and - a motorized valve comprising a motor, in which the switching means of the system connect the electrical voltage source to the power supply terminals of the valve motor.

[0020] In particular, the motorized valve may include at least one strain sensor, and the equipment may then be configured so that during an actuation of the valve, the system triggers an interruption of the power supply to the valve motor when the strain sensor produces measurement signals that indicate strains greater than a threshold.

[0021] In such equipment according to the invention, the electrical voltage source may be of the three-phase type with 380 V interphase voltage, and the system arranged and sized to be inserted into an electrical power distribution cabinet.

[0022] Finally, equipment according to the invention can be installed to control a fluid circuit of a power generation plant, in particular a nuclear power plant. Brief description of the figures

[0023] The features and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments, with reference to the accompanying figures, among which:

[0024] [Fig.1], already described, represents the main elements of a motorized valve;

[0025] [Fig.2], already described, is a diagram of the variation in intensity of an over-stress which is suffered by a valve conforming to [Fig.1], as a function of an opening delay of a contactor used to electrically supply the valve;

[0026] [Fig.3] is a general diagram of equipment according to the invention, for controlling a fluid flow; and

[0027] [Fig.4] is an electrical diagram of a valve actuation system which can be used in the equipment of [Fig.3]. Detailed description of the invention

[0028] For clarity, the dimensions of the elements shown in these figures do not correspond to actual dimensions or ratios of actual dimensions. Furthermore, some of these elements are represented only symbolically, and identical reference numerals shown in different figures designate identical elements or elements with identical functions.

[0029] By way of illustration, but without limitation, the embodiment of the invention described in detail now reproduces the equipment structure of [Fig. 1], in the case of a servomotor 3, which is of the three-phase asynchronous type supplied with 380 V (volts) interphase voltage. The invention consists of replacing the electromechanical contactor 13 with IGBT-based switching means 14, as described below, and optionally using a protection circuit 16 enhanced with an energy dissipation function. This energy dissipation function is intended to be effective each time the power supply to the servomotor 3 of the valve 1 is interrupted, and constitutes an electrical braking for the servomotor.

[0030] [Fig. 3] shows an embodiment of the invention in the form of a new power module 11 for use in actuating the valve 1. This new power module 11 can be of either type N660 or N680 for insertion into a Normabloc® electrical cabinet, well known to those skilled in the art. It constitutes the electrical actuation system for the motorized valve as introduced in the general part of this description, and the combination of this power module 11 with the electrical voltage source 20 and the motorized valve 1 constitutes the fluid flow control equipment. References 21, 22 and 23 designate the three terminals of the electrical voltage source 20, which deliver two-by-two alternating electrical voltages of 380 V-peak offset in phase by 120°, and references 31, 32 and 33 designate the three supply terminals of the servomotor 3 of the valve 1.

[0031] In the embodiment of the invention, which is described in detail below, the power module 11 contains the following elements: - one or more switching card(s) 14, which carry(s) the IGBT transistors used to connect each stator coil of the servomotor 3 to one of the outputs 21, 22, 23 of the electrical voltage source 20. Each connection thus made between one of the stator coils and one of the outputs 21, 22, 23 of the source 20 is called a switching branch, corresponding to the switching means mentioned in the general part of this description; - one or more control card(s) 15 to control the IGBT transistors of each switching card 14, and which constitute(s) the control means mentioned in the general part of this description; - a protection board 16, which also provides the electric braking function for the servomotor 3; and - a digital card 17, which contains a digital circuit to control the operation of the protection card 16, in order to produce the electric braking function. As is common practice in this technical field, the signal inputs and outputs of each control card 15 and the digital card 17 are equipped with galvanic isolation interfaces, for example, of the electro-optical type, and labeled E / O. Furthermore, according to a typical design, at least one pair, comprising a switching card 14 and its associated control card 15, is dedicated separately to each switching branch. Thus, the example shown in [Fig. 3] and [Fig. 4] illustrates a five-branch switching configuration.

[0032] The switching board(s) 14 further carry(s) a shunt resistor SH for each switching branch, which is connected in series with the IGBT transistors of that switching branch. These resistors SH allow control of the electrical currents transmitted to the coils of the servomotor 3, to confirm the switching operation of the IGBT transistors and also to detect excessive currents that might occur.

[0033] In each control card 15, LOG15 designates a logic circuit, DR, for "driver," designates a control component connected to the gate of one of the IGBT transistors of the switching cards 14, AMP1 designates an amplifier arranged to amplify an electrical voltage present across one of the resistors SH, and COMP1 designates a threshold comparator that detects situations of excessive current transmitted through the corresponding switching branch. The LOG15 logic circuits are configured to drive the DR control components based on OCP (over-current protection) signals delivered by the comparators. C0MP1 and a power supply or non-power supply instruction noted ON / OFF which is delivered by the digital card 17.

[0034] In the digital card 17, LOG17 designates another logic circuit that is configured to transmit the ON / OFF power supply or non-power supply command to each control card 15, based on valve 1 actuation request signals RQ received from an application driver 12, and OCP overcurrent signals. The logic circuit LOG17 also transmits at least one electric braking function activation signal to the protection and electric braking card 16.

[0035] Preferably, each control card 15 and the digital card 17 are made up solely of non-programmable components such as operational amplifiers, comparators and analog logic gates, without using programmable components, or digital devices with limited functionality known by the acronym ANFL and as defined in the International Electronic Commission standard IEC 62671 (ISBN 978-2-83220-630-0).

[0036] For the application of the invention to a motorized strain-sensor valve described herein, each control board 15 has at least one additional control channel connected as an input to the output of one or more of the strain sensors 8 of the valve 1. This additional control channel includes an amplifier AMP2 configured to amplify the strain measurement signals produced by the strain sensor 8, and a threshold comparator COMP2 connected as an input to the output of the amplifier AMP2. The output of the threshold comparator COMP2 is connected to the logic circuits LOG15 and LOG17 to produce an over-stress protection signal, denoted OSP for "over-stress protection." This OSP signal is then used to trigger a sequence to stop the rotation of the servomotor 3 when the sensor 8 detects a strain at a point on the valve 1 that exceeds the threshold.As explained later, this stopping sequence includes an interruption of the power supply to the servomotor 3, which is produced by the switching boards 14, and the electric braking which is produced by the board 16. In this way, the rotation of the servomotor 3 is stopped in a very short time, which reduces or avoids the occurrence of excessive over-stress in the valve 1.

[0037] [Fig. 4] is a diagram of possible electrical circuits for the switching board(s) 14 and for the electric protection and braking board 16. The switching board(s) 14 have three switching branches, labeled BC1, BC2, and BC3, for rotating the servomotor 3 in one direction, and two additional branches, BC4 and BC5, for reversing the direction of rotation of the servomotor 3. The switching branch BC1 connects to terminal 21 of the electrical voltage source. 20 to terminal 31 of coil L1 of the stator of servomotor 3. Similarly, the switching branch BC2 (respectively BC3) connects terminal 22 (respectively 23) of the electrical voltage source 20 to terminal 32 (respectively 33) of coil L2 (respectively L3) of the stator of servomotor 3. In a manner known for an asynchronous motor, its stator coils L1, L2 and L3 are connected in star by their other respective terminals. To reverse the direction of rotation of the servomotor 3, the switching branch BC4 (or BC5) connects terminal 22 (or 21) of the electrical voltage source 20 to terminal 31 of coil L1 (or 32 of coil L2) of the stator of the servomotor 3. All switching branches BC1 to BC5 can be identical and carried by separate switching boards 14. Each switching branch BC1,...BC5 comprises two IGBT transistors, designated IGBT1 and IGBT2, which are connected in series and in opposite directions within each switching branch: the emitter of IGBT1 is connected to the emitter of IGBT2 through an intermediate terminal of the switching branch, called the midpoint terminal and designated M. The collector of IGBT1 is connected to the corresponding terminal 21, 22, 23 of the electrical voltage source 20, and the collector of IGBT2 is connected to the corresponding supply terminal 31, 32, 33 of the servomotor 3. Each switching branch BC1,..., BC5 further comprises the corresponding shunt resistor SH, whose function is to allow the control boards 15 to control the switching operation of this switching branch, and also to detect if an excessive current flows in this switching branch, as already described above.A diode DI is connected between the emitter and collector of each IGBT1 transistor, with its bias running from the emitter of IGBT1 to the collector of the same IGBT1 transistor. Similarly, a diode D2 is connected between the emitter and collector of each IGBT2 transistor, with its bias running from the emitter of IGBT2 to the collector of the same IGBT2 transistor. The control board 15, which is assigned to one of the switching branches BC1,..., BC5, transmits two control signals to that branch: a first control voltage between the gate of IGBT1 and the midpoint terminal M of that switching branch, and a second control voltage between the gate of IGBT2 and the midpoint terminal M of the same switching branch.The first control voltage enables the switching branch to conduct during the positive half-cycles of the supply voltage delivered by the corresponding terminal of the electrical voltage source 20 with respect to the common point of coils L1-L3, and the second control voltage enables this same switching branch to conduct during the negative half-cycles of the same supply voltage. Zero values ​​for both control voltages of transistors IGBT1 and IGBT2 of the same type. The switching branch removes the power supply capability to servomotor 3 through this switching branch. Control board models 14 designed to produce this power supply and non-power supply operation are commercially available.

[0038] The circuit of the electrical protection and braking board 16, which has been called the electrical dissipation circuit in the general part of this description, comprises the association of the following branches in parallel between the two nodes A and B: - a separate branch of rectifier bridge RD for each of the servomotor 3 supply terminals 31, 32 and 33. Each branch RD includes two diodes D3 and D4 which are connected in series and in the same direction from node B to node A, with an intermediate terminal between the two diodes which is connected to the corresponding servomotor 3 supply terminal 31, 32, 33; - a LT branch with a voltage limiting function, which includes a Zener diode Z with its cathode connected to node A and its anode connected to node B; - at least one branch with capacitive braking function, comprising a capacitor C_Fr and optionally a load resistor R_Ch connected in series with the capacitor C_Fr, in this case with a controlled switch which is connected in parallel with the load resistor R_Ch; - at least one discharge branch including a discharge resistor R_L; and - at least one resistive braking function branch, including a braking resistor R_Fr and another controlled switch which is connected in series with the resistor R_Fr. The two controlled switches can be additional IGBT transistors, respectively designated IGBT3 for the branch with resistive braking function and IGBT4 for the branch with capacitive braking function. When servomotor 3 rotates while supplied with a 380 V interphase peak voltage, the voltage between nodes A and B is approximately 600 V DC, filtered by the combination of capacitor C_Fr and resistor R_L, which have high values. The controlled switch IGBT3 is then controlled by digital board 17 to be in its off state. Zener diode Z is selected with a threshold voltage of approximately 650 V to protect against overvoltages exceeding this threshold. During the continuous rotation of servomotor 3 and throughout the subsequent stopping sequence, the controlled switch IGBT4 is held closed by logic circuit 17, so that the load resistor R_Ch does not come into play. When all switching branches BC are simultaneously interrupted by control boards 15, a switching electromotive force produced by servomotor 3 is possibly clipped by theThe Zener diode Z and the corresponding electric current are absorbed by the capacitor C_Fr and then conducted through the braking resistor R_Fr. To achieve this, the digital board 17 switches the controlled switch IGBT3 to its conducting state with a slight time delay relative to the switching of transistors IGBT1 and IGBT2, thus interrupting the power supply to the servomotor 3. Subsequently, the capacitor C_Fr discharges completely through resistors R_L and R_Fr. A person skilled in the art will be able to select, based on the preceding description of the electric braking operation, the values ​​of the capacitor C_Fr and the resistors R_L and R_Fr, as well as the switching delay of the controlled switch IGBT3, to produce effective electric braking.This electric braking is implemented for each interruption of the power supply to the servomotor 3, whether this interruption is caused by an over-force that has been detected by the one or one of the strain sensor(s) 8, or caused by an over-current that has been detected via one of the shunt resistors SH, or is produced in response to an RQ request that comes from the application driver 12. The logic circuit L0G17 can then transmit back to the application driver 12, an RT signal which confirms the interruption of the power supply.

Claims

Demands

1. An electrical actuation system (11) for a motorized valve (1), comprising switching means (14) for establishing, maintaining and then interrupting an electrical supply to a motor (3) of the valve from an electrical voltage source (20), and control means (15) adapted to activate the switching means, characterized in that the switching means (14) comprise insulated-gate bipolar transistors (IGBT1, IGBT2) which are arranged to electrically connect, during use of the system (11) to actuate the valve (1), the electrical voltage source (20) to terminals (31, 32, 33) supplying the motor (3) of the valve through electrical conduction paths of the insulated-gate bipolar transistors, and in that electrical outputs of the control means (15) are connected to the gates of the insulated-gate bipolar transistors.

2. System (11) according to claim 1, adapted for an AC-type electrical voltage source (20), and adapted so that during use of the system, terminals (21, 22, 23) of the electrical voltage source are connected one by one to the supply terminals (31, 32, 33) of the motor (3) of the valve (1) through the electrical conduction paths of two insulated-gate bipolar transistors (IGBT1, IGBT2) which are connected in series with opposite directions of conduction inside separate switching branches (BC1, ..., BC5), the system further comprising a respective diode (D1, D2) for each of the two insulated-gate bipolar transistors of each switching branch, the diode being connected in parallel with the corresponding insulated-gate bipolar transistor so that said insulated-gate bipolar transistor and said diode have opposite directions of conduction.

3. System (11) according to claim 1 or 2, further comprising an electrical dissipation circuit (16) arranged to be connected to the supply terminals (31, 32, 33) of the motor (3) of the valve (1), in parallel with coils (L1, L2, L3) of said motor, said electrical dissipation circuit being adapted to electrically absorb at least a portion of a quantity of energy which is released by the motor when the power supply to said motor is interrupted.

4. System (11) according to claim 3, wherein the electrical dissipation circuit (16) comprises the following circuit branches, which are connected in parallel: - diode bridge rectifier branches (RD), one bridge rectifier branch per motor supply terminal (31, 32, 33); - a voltage limiting function branch (LT), preferably comprising a Zener diode (Z); - at least one capacitive braking function branch, comprising a capacitor (C_Fr); - at least one discharge branch comprising a discharge resistor (R_L); and - at least one resistive braking function branch, comprising a braking resistor (R_Fr) and a controlled switch (IGBT3) which is connected in series with the braking resistor to control resistive braking operation.

5. System (11) according to any one of the preceding claims, further comprising a digital circuit (17) adapted to transmit commands to establish and interrupt power supply to the control means (15), and to receive feedback signals relating to an execution of each of said commands, and preferably also signals indicating electrical currents transmitted to the valve motor (1) which are above a limit.

6. System (11) according to claim 5 and claim 3 or 4, wherein the digital circuit (17) is further adapted to control an operation of the electrical dissipation circuit (16) at each interruption of the electrical supply to the motor (3) of the valve (1).

7. System (11) according to any one of the preceding claims, in the control means (15) are further adapted to receive stress measurement signals which are transmitted by at least one stress sensor (8) of the valve (1) during use of the system to actuate said valve, and to control the switching means (14) in order to interrupt the power supply to the motor (3) of the valve when the measurement signals indicate stresses exceeding a threshold.

8. System (11) according to any one of the preceding claims, arranged and dimensioned to be inserted into an electrical power distribution cabinet.

9. System (11) according to any one of the preceding claims, wherein the control means (15), and the digital circuit (17) where applicable, are made up of non-programmable components and are devoid of programmable components.

10. Fluid flow control equipment, comprising: - an electrical voltage source (20); - a system (11) which conforms to one of the preceding claims; and - a motorized valve (1) comprising a motor (3), in which the switching means (14) of the system (11) connect the electrical voltage source (20) to the power supply terminals (31, 32, 33) of the motor (3) of the valve (1).

11. Equipment according to claim 10, wherein the motorized valve (1) includes at least one strain sensor (8), and the equipment is configured such that during an actuation of the valve (1), the system (11) triggers an interruption of the power supply to the motor (3) of said valve when the strain sensor produces measurement signals that indicate strains exceeding a threshold.

12. Equipment according to claim 10 or 11, wherein the electrical voltage source (20) is of the three-phase type with 380 V interphase voltage, and the system conforms to claim 8.

13. Equipment according to any one of claims 10 to 12, installed to control a fluid circuit of a power generation plant, in particular a nuclear power plant.

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