Performance detection method and system for hydraulic servo-motor of nuclear power plant

Abstract

The invention relates to a nuclear power plant hydraulic servo-motor performance detection method and system, and the method comprises the steps: S10, carrying out the oil leakage test of an oil cylinder of a detected hydraulic servo-motor, so as to determine whether the oil cylinder leaks oil, and if not, executing S20; s20, performing an oil leakage test on the whole oil-driven structure of the tested hydraulic servo-motor to determine whether the whole oil-driven structure leaks oil or not, and if not, executing S30; s30, performing a switch action test on the tested hydraulic servo-motor to determine whether the tested hydraulic servo-motor has abnormal action or not, and if not, executing S40; s40, performing a step response test on the tested hydraulic servo-motor to determine whether the overshoot performance of the tested hydraulic servo-motor is qualified or not; and S50, when the overshoot performance of the tested hydraulic servo-motor is qualified, judging that the performance of the tested hydraulic servo-motor is qualified. The method can accurately and comprehensively detect whether the performance of the hydraulic servo-motor is qualified in the nuclear power plant, and plays a positive role in improving the safety and economic benefits of the nuclear power plant.

Description

Technical Field

[0001] The present invention relates to the technical field of oil motors in nuclear power plants, and particularly to a method and system for detecting the performance of oil motors in nuclear power plants. Background Art

[0002] The oil motor is a key actuator of the steam turbine generator set, undertaking the precise control function of the main steam valve and the governing valve, and directly affecting the power regulation and safe operation of the nuclear power unit. A single unit in a certain nuclear power plant is equipped with 16 oil motors (8 main steam valve oil motors + 8 governing valve oil motors). Its core integrated module includes precision hydraulic control components such as CVP / CVS cartridge valves, solenoid valves, and electro-hydraulic proportional valves. The oil circuit topology has a high complexity, and the assembly tolerance requirements are extremely strict (at the μm level). The maintenance quality is directly related to the unit availability and the nuclear safety risk level. Therefore, it is necessary to regularly detect the performance of the oil motor. At present, the maintenance method of a certain nuclear power plant is to send the oil motor back to the manufacturer for maintenance. However, the price of each return repair is extremely high (even exceeding 4 million yuan per time), and the transportation distance is very far (sometimes it requires cross-border transportation), resulting in a greatly increased transportation risk. Moreover, manual supervision is required throughout the return repair process, and the maintenance cycle is long, resulting in a very high comprehensive cost. At present, the nuclear power plant urgently needs a technical solution that can reduce the comprehensive cost of oil motor maintenance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for detecting the performance of oil motors in nuclear power plants.

[0004] The technical solution adopted by the present invention to solve its technical problem is to construct a method for detecting the performance of an oil motor in a nuclear power plant, including: S10. Conduct a leakage test on the oil cylinder of the oil motor to be measured to determine whether the oil cylinder leaks oil. If not, execute S20; wherein, the leakage oil includes internal leakage and external leakage; S20. Conduct a leakage test on the overall oil driving structure of the oil motor to be measured to determine whether the overall oil driving structure leaks oil. If not, execute S30; wherein, the overall oil driving structure includes the oil cylinder and an adjustment component connected to the oil cylinder; S30. Conduct a switch action test on the oil motor to be measured to determine whether there is any abnormal action in the oil motor to be measured. If not, execute S40; S40. Conduct a step response test on the oil motor to be measured to determine whether the overshoot performance of the oil motor to be measured is qualified; S50. When the overshoot performance of the oil motor to be measured is qualified, determine that the performance of the oil motor to be measured is qualified.

[0005] Preferably, in S10 and S20, the leakage test includes a multi-pressure pressure resistance test and an internal leakage test; The multi-pressure pressure resistance test includes: controlling the in-cylinder pressure of the oil cylinder or the input pressure of the overall hydraulic structure to make the oil cylinder or the overall hydraulic structure maintain for corresponding time under various first set pressures; The internal oil leakage test includes: controlling the in-cylinder pressure of the oil cylinder or the input pressure of the overall hydraulic structure to make the oil cylinder or the overall hydraulic structure maintain at a second set pressure, and when testing the overall hydraulic structure, adjusting the stroke of the oil motor under test during the pressure maintenance period.

[0006] Preferably, in the S10, determining whether the oil cylinder leaks oil includes: during the multi-pressure pressure resistance test of the oil cylinder, detecting whether external oil leakage occurs on the surface of the oil cylinder; during the internal oil leakage test of the oil cylinder, detecting whether internal oil leakage occurs at the oil return end of the oil cylinder; when no external oil leakage occurs on the surface of the oil cylinder and no internal oil leakage occurs at the oil return end of the oil cylinder, determining that the oil cylinder has no oil leakage; In the S20, determining whether the overall hydraulic structure leaks oil includes: during the multi-pressure pressure resistance test of the overall hydraulic structure, detecting whether external oil leakage occurs on the surface of the overall hydraulic structure; during the internal oil leakage test of the overall hydraulic structure, detecting whether internal oil leakage occurs in the oil return path of the overall hydraulic structure; when no external oil leakage occurs on the surface of the overall hydraulic structure and no internal oil leakage occurs in the oil return path of the overall hydraulic structure, determining that the overall hydraulic structure has no oil leakage.

[0007] Preferably, when performing the multi-pressure pressure resistance test on the oil cylinder, the various first set pressures include 5 Mpa, 10 Mpa, 12 Mpa, 13.5 Mpa, and 18 Mpa. Among them, the maintenance time corresponding to the first set pressure of 5 Mpa, 10 Mpa, or 18 Mpa is 8 minutes to 12 minutes, the maintenance time corresponding to the first set pressure of 12 Mpa is 50 minutes to 70 minutes, and the maintenance time corresponding to the first set pressure of 13.5 Mpa is 25 minutes to 35 minutes; When performing the multi-pressure pressure resistance test on the overall hydraulic structure, the various first set pressures include 12 Mpa, 13.5 Mpa, and 18 Mpa. Among them, the maintenance time corresponding to the first set pressure of 12 Mpa is 50 minutes to 70 minutes, and the maintenance time corresponding to the first set pressure of 13.5 Mpa or 18 Mpa is 25 minutes to 35 minutes.

[0008] Preferably, in the step S30, the test of the on - tested servomotor for switching actions includes: controlling the on - tested servomotor to perform a variety of preset switching actions, and collecting the oil pressure and stroke curve set of the on - tested servomotor during the action process; the preset switching actions include slow - closing and opening actions, slow - switching actions, fast - closing and opening actions, and fast - switching actions; Determining whether there is an abnormal action of the on - tested servomotor includes: judging whether there is an abnormal action of the on - tested servomotor according to the oil pressure and stroke curve set.

[0009] Preferably, judging whether there is an abnormal action of the on - tested servomotor according to the oil pressure and stroke curve set includes: Determining the action characteristic parameters and hysteresis of each preset switching action according to the oil pressure and stroke curve set; wherein, the action characteristic parameters include full - close oil pressure, full - open oil pressure and action time; Judging whether each characteristic parameter in the action characteristic parameters of each preset switching action is within the set allowable range corresponding to each characteristic parameter; Also performing a smoothness analysis on the oil pressure and stroke curve set to determine whether there are inflection points that meet the set conditions during the action process of the oil pressure and stroke curve set; When all characteristic parameters are respectively within the corresponding set allowable ranges and there are no inflection points that meet the set conditions in the oil pressure and stroke curve set during the action process, it is determined that there is no abnormal action of the on - tested servomotor.

[0010] Preferably, the step S40 includes: Controlling the on - tested servomotor to perform a back - and - forth step - by - step action between two preset target openings; Collecting the actual opening of the on - tested servomotor when the back - and - forth step - by - step action is completed; Calculating the overshoot according to the actual opening and the preset target opening when the back - and - forth step - by - step action is completed; Judging whether the overshoot is less than the set overshoot threshold; When the overshoot is less than the set overshoot threshold, it is determined that the overshoot performance of the on - tested servomotor is qualified.

[0011] Preferably, the expression formula of the overshoot is: ; represents the overshoot, C1 represents the actual opening, and C2 represents the preset target opening when the back - and - forth step - by - step action is completed; The set range of the set overshoot threshold is 5% to 20%.

[0012] The present invention also provides a nuclear power plant servomotor performance detection system, including: A control module, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned method for detecting the performance of the oil actuator in a nuclear power plant are implemented; A preset detection device, which is used to provide the required oil pressure for testing the oil cylinder and the overall oil actuator structure, and measure the internal leakage oil volume of the oil cylinder and the overall oil actuator structure during the test.

[0013] Preferably, the preset detection device includes an oil storage container, an oil pump, a relief valve, a supply oil cut-off valve, a return oil cut-off valve, a flow measurement cut-off valve, a flowmeter, a temperature measurement module, and a pressure gauge; The oil storage container is used to store the test oil; The oil pump, its first end is connected to the oil storage container, and its second end is connected to the supply oil end of the oil cylinder or the overall oil actuator structure through the supply oil cut-off valve, and is used to provide pressurizing power for the test oil input to the supply oil end of the oil cylinder or the overall oil actuator structure; The relief valve is connected between the oil storage container and the second end of the oil pump, and is used to adjust the oil pressure of the test oil according to the test requirements; The pressure gauge is used to connect to the supply oil end of the oil cylinder or the overall oil actuator structure and measure the oil pressure at the supply oil end; The return oil cut-off valve, its first end is used to connect to the return oil end of the oil cylinder or the overall oil actuator structure, and its second end is connected to the oil storage container, and is used to shut off when measuring the internal leakage oil; The flow measurement cut-off valve, one end of which is connected to the first end of the return oil cut-off valve, and its second end is connected to the oil storage container through the flowmeter, and is used to conduct when measuring the internal leakage oil and shut off when determining the external leakage oil; The flowmeter is used to measure the flow rate of the internal leakage oil; The temperature measurement module is used to measure the temperature of the test oil and determine whether the temperature of the test oil is within the set temperature range.

[0014] Implementing the present invention has the following beneficial effects: It provides a method for detecting the performance of the oil actuator in a nuclear power plant, which can detect the performance characteristics of the oil actuator in various dimensions such as leakage oil, actual action performance, and overshoot, and then accurately and comprehensively detect whether the performance of the oil actuator is qualified. It can also detect the performance of the oil actuator in the nuclear power plant without sending it for inspection, significantly shortening the maintenance cycle and reducing the maintenance cost. It also has the characteristics of comprehensive test items, which plays a positive role in improving the safety and economic benefits of the nuclear power plant. Description of the Drawings

[0015] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings: Figure 1 is the program flow chart of the nuclear power plant oil actuator performance detection method in some embodiments of the present invention; Figure 2 is the structural schematic diagram of the main steam valve oil actuator in a certain nuclear power plant; Figure 3 is the structural schematic diagram of the control valve oil actuator in a certain nuclear power plant; Figure 4 is the oil pressure - stroke relationship curve corresponding to the quick - close opening action and the quick - close and quick - open actions in some embodiments of the present invention; Figure 5 is the stroke - time relationship curve corresponding to the quick - close opening action in some embodiments of the present invention; Figure 6 is the stroke - time relationship curve corresponding to the quick - close and quick - open action in some embodiments of the present invention; Figure 7 is the stroke - time relationship curve corresponding to the slow - close and slow - open action in some embodiments of the present invention; Figure 8 is the stroke - time relationship curve when the valve has jamming or jamming during the action in some embodiments of the present invention; Figure 9 is the stroke - time relationship curve corresponding to the back - and - forth step action in some embodiments of the present invention; Figure 10 is the structural schematic diagram of the nuclear power plant oil actuator performance detection system in some embodiments of the present invention; Figure 11 is the structural schematic diagram of the preset detection device in some embodiments of the present invention. Detailed implementation manners

[0016] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0017] It should be noted that the flow chart shown in the accompanying drawings is only an exemplary illustration, and does not necessarily include all the contents and operations / steps, nor does it necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0018] The block diagrams shown in the accompanying drawings are only functional entities, and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices. Figure 1It is a program flow chart of the method for detecting the performance of the oil actuator in some embodiments of the present invention. This method can detect the performance of the oil actuator in a nuclear power plant, and has the advantages of high efficiency and comprehensive test items.

[0019] It should be noted that the oil actuators in nuclear power plants include, but are not limited to, the main steam valve oil actuator and the regulating valve oil actuator.

[0020] Figure 2 It is a schematic structural diagram of the main steam valve oil actuator in a certain nuclear power plant. The main steam valve oil actuator includes an oil cylinder 41, a piston rod 43, a spring 12, a displacement sensor 18, a pressure sensor 17, a main steam cartridge valve 14, a main steam solenoid valve 13, a first main steam throttle hole 15, a second main steam throttle hole 16, and a first industrial control computer 11. It should be noted that the regulating component 42 of the main steam valve oil actuator includes the main steam cartridge valve 14, the main steam solenoid valve 13, the first main steam throttle hole 15, and the second main steam throttle hole 16.

[0021] The operating principle of the main steam valve oil actuator is as follows: When receiving the valve 5 opening command, the main steam solenoid valve 13 is energized, and high-pressure oil passes through the main steam solenoid valve 13 and reaches the large end of the main steam cartridge valve 14. Based on the designed area difference of the main steam cartridge valve 14, under the action of the high-pressure oil, the main steam cartridge valve 14 closes, and the high-pressure oil reaches the oil supply end of the oil cylinder 41 (i.e., high-pressure oil enters chamber A) through the first main steam throttle hole 15 and the second main steam throttle hole 16 to overcome the resistance of the spring 12, friction, etc., and push the piston rod 43 to move to the left, thereby driving the valve 5 to open. When receiving the valve 5 closing command, when the solenoid valve 13 is de-energized, the oil supply to the main steam solenoid valve 13 is cut off, and the main steam cartridge valve 14 is connected to the oil return port of the main steam solenoid valve 13. The main steam cartridge valve 14 opens, and the high-pressure oil is connected to the oil return end of the oil cylinder 41 through the main steam cartridge valve 14. The oil source in chamber A is discharged to chamber B or the oil return end side under the action of the spring 12, and the piston rod 43 moves to the right. Driven by the spring 12, the valve 5 closes. It should be noted that the first industrial control computer 11 is used to monitor the opening of the valve 5 by detecting the displacement of the piston rod 43 through the displacement sensor 18, detect the oil pressure in chamber A of the oil cylinder 41 through the pressure sensor 17, and send a servo signal to the main steam solenoid valve 13 to control the opening of the valve 5.

[0022] Figure 3It is a schematic structural diagram of the regulating valve oil motor in a certain nuclear power plant. The regulating valve oil motor includes an oil cylinder 41, a piston rod 43, a spring 12, a displacement sensor 18, a pressure sensor 17, a proportional control valve 21, a first regulating valve throttle hole 22, a first regulating valve cartridge valve 23, a second regulating valve throttle hole 24, a second regulating valve cartridge valve 25, a regulating valve solenoid valve 26, and a second industrial control computer 27. It should be noted that the regulating component 42 of the regulating valve oil motor includes a proportional control valve 21, a first regulating valve throttle hole 22, a first regulating valve cartridge valve 23, a second regulating valve throttle hole 24, a second regulating valve cartridge valve 25, and a regulating valve solenoid valve 26. It should be noted that the function of the second industrial control computer 27 is similar to that of the first industrial control computer 11, and the principle of its controlling the regulating valve oil motor can refer to the above text or the prior art, which will not be elaborated here.

[0023] The operating principle of the regulating valve oil motor is as follows: When receiving the valve 5 opening command, the regulating valve solenoid valve 26 is controlled to be de-energized. High-pressure oil passes through the regulating valve solenoid valve 26 and reaches the large end of the first regulating valve cartridge valve 23. Based on the area design difference of the first regulating valve cartridge valve 23, under the action of high-pressure oil, the first regulating valve cartridge valve 23 closes. When the second industrial control computer 27 receives the opening command, the spool of the proportional control valve 21 moves to the left and reaches the large end of the second regulating valve cartridge valve 25. Based on the area design difference of the second regulating valve cartridge valve 25, under the action of high-pressure oil, the second regulating valve cartridge valve 25 closes. The high-pressure oil reaches the A chamber of the oil cylinder 41 through the second regulating valve throttle hole 24. The high-pressure oil overcomes the resistance of the spring 12, friction, etc., and pushes the piston rod 43 to move to the left, thereby driving the valve 5 to open. For the first closing method of the valve 5, the spool of the proportional control valve 21 is controlled to move to the right, and the high-pressure oil is cut off by the proportional control valve 21. The second regulating valve cartridge valve 25 opens. The oil source in the A chamber of the oil cylinder 41, under the action of the spring 12, is discharged to the B chamber of the oil cylinder 41 and the oil return end side through the oil return port of the proportional control valve 21 and the second regulating valve cartridge valve 25. The piston rod 43 moves to the right, and the spring 12 drives the valve 5 to close. For the second closing method of the valve 5, the regulating valve solenoid valve 26 is controlled to be energized, and the first regulating valve cartridge valve 23 is cut off from the oil inlet to make it open. The large end of the second regulating valve cartridge valve 25 is communicated with the oil return end of the oil cylinder 41 through the first regulating valve cartridge valve 23. The second regulating valve cartridge valve 25 opens. The oil source in the A chamber of the oil cylinder 41, under the action of the spring 12, is discharged to the B chamber of the oil cylinder 41 and the oil return end side through the second regulating valve cartridge valve 25. The piston rod 43 moves to the right, and the spring 12 drives the valve 5 to close.

[0024] It should be noted that the structures of the oil cylinder 41, the piston rod 43, and the spring 12 of the main steam valve oil motor and the regulating valve oil motor are similar to the operating principle of driving the valve 5, but there are differences in the regulating components 42 of the two oil motors. For details, please refer to Figure 2 and Figure 3, but the detection method provided by the present invention is applicable to both of these two oil motors, and of course, it can also be applied to other oil motors.

[0025] Please refer to Figure 1 , the oil motor performance detection method for this nuclear power plant may include step S10, step S20, step S30, step S40, and step S50.

[0026] Step S10 includes: performing a leakage test on the oil cylinder 41 of the oil motor to be measured to determine whether the oil cylinder 41 leaks oil. If not, execute S20; wherein, the leakage of oil includes internal oil leakage and external oil leakage.

[0027] It should be noted that internal oil leakage usually refers to the phenomenon that high-pressure oil leaks inside due to some valves inside the oil motor not being tightly closed. External oil leakage usually refers to the phenomenon that high-pressure oil leaks from the seals or gaps of the components of the oil motor to the outside of the oil motor, and it can usually be determined by visual inspection.

[0028] The function of this step is to test whether the oil cylinder 41 of the oil motor to be measured leaks oil under various pressure conditions to ensure that the performance of the oil cylinder 41 is normal before proceeding with the subsequent detection steps. Further, if the oil cylinder 41 of the oil motor to be measured leaks oil, the detection method can be paused, and the oil cylinder 41 can be repaired. After the oil cylinder 41 is completed, step S10 can be executed again to continue the subsequent detection steps.

[0029] In some embodiments, the leakage test of oil can include a multi-pressure pressure resistance test and an internal oil leakage test.

[0030] The multi-pressure pressure resistance test performed on the oil cylinder 41 can include: by controlling the input pressure of the pressure inside the oil cylinder 41, so that the oil cylinder 41 maintains the corresponding time under various first set pressures respectively.

[0031] It can be understood that the function of the multi-pressure pressure resistance test is to test whether there is external oil leakage in the oil cylinder 41 under different pressure environments.

[0032] Further, when performing the multi-pressure pressure resistance test on the oil cylinder 41, the various first set pressures include 5 Mpa, 10 Mpa, 12 Mpa, 13.5 Mpa, and 18 Mpa. Among them, the corresponding maintenance time when the first set pressure is 5 Mpa, 10 Mpa, or 18 Mpa is 8 minutes to 12 minutes, preferably 10 minutes. The corresponding maintenance time when the first set pressure is 12 Mpa is 50 minutes to 70 minutes, preferably 60 minutes. The corresponding maintenance time when the first set pressure is 13.5 Mpa is 25 minutes to 35 minutes, preferably 30 minutes. Of course, the magnitude of each first set pressure and the length of the corresponding maintenance time can also be custom-set according to requirements.

[0033] The internal oil leakage test on the oil cylinder 41 may include: controlling the internal pressure of the oil cylinder 41 to maintain the oil cylinder 41 at a second set pressure. Among them, the setting range of the second set pressure may be from 10 Mpa to 14 Mpa, and the second set pressure is preferably 12 Mpa.

[0034] It can be understood that the function of the internal oil leakage test is to test whether there is internal oil leakage in the oil cylinder 41 under a high-pressure environment.

[0035] In some embodiments, determining whether the oil cylinder 41 leaks oil in step S10 may include: detecting whether there is external oil leakage on the surface of the oil cylinder 41 during the multi-pressure pressure resistance test of the oil cylinder 41; detecting whether there is internal oil leakage at the oil return end of the oil cylinder 41 during the internal oil leakage test of the oil cylinder 41; when there is no external oil leakage on the surface of the oil cylinder 41 and no internal oil leakage at the oil return end of the oil cylinder 41, it is determined that the oil cylinder 41 has no oil leakage.

[0036] In this embodiment, it is possible to determine whether there is external oil leakage on the surface of the oil cylinder 41 through the prior art or visual observation, so as to determine whether there is external oil leakage in the oil cylinder 41; and to detect the flow rate of the oil return end of the oil cylinder 41 through a flow meter to determine whether the flow rate of the oil return end of the oil cylinder 41 is greater than a first set threshold. When the flow rate of the oil return end of the oil cylinder 41 is greater than the first set threshold, it is determined that there is internal oil leakage in the oil cylinder 41.

[0037] Step S20 includes: performing an oil leakage test on the overall oil driving structure 40 of the oil motor to be tested to determine whether the overall oil driving structure 40 leaks oil. If not, execute S30; among them, the overall oil driving structure 40 includes an oil cylinder 41 and an adjustment assembly 42 connected to the oil cylinder 41.

[0038] The function of this step is to test whether there is oil leakage in the overall oil driving structure 40 of the oil motor to be tested under various pressure conditions to ensure that the performance of the overall oil driving structure 40 is normal before performing subsequent detection steps. Further, if the overall oil driving structure 40 leaks oil, the detection method can be paused, and the overall oil driving structure 40 can be repaired. After the overall oil driving structure 40 is completed, step S20 can be executed again to continue the subsequent detection steps.

[0039] In some embodiments, the multi-pressure pressure resistance test on the overall oil driving structure 40 may include: controlling the input pressure of the overall oil driving structure 40 to maintain the overall oil driving structure 40 at various first set pressures for corresponding times.

[0040] Further, when performing multi-pressure pressure resistance tests on the overall oil-driven structure 40, multiple first set pressures include 12 Mpa, 13.5 Mpa, and 18 Mpa. Among them, the holding time corresponding to the first set pressure of 12 Mpa is 50 to 70 minutes, preferably 60 minutes. The holding time corresponding to the first set pressure of 13.5 Mpa or 18 Mpa is 25 to 35 minutes, preferably 30 minutes.

[0041] In some embodiments, the internal oil leakage test performed on the overall oil-driven structure 40 includes: by controlling the input pressure of the overall oil-driven structure 40 to maintain the overall oil-driven structure 40 under a second set pressure, and also adjusting the stroke of the oil motor under test during the pressure maintenance period.

[0042] In this embodiment, during the pressure maintenance period, the stroke of the piston rod 43 of the oil motor under test can be controlled to move back and forth between 0% and 100% of the stroke, or the piston rod 43 can be controlled to switch between multiple target strokes (including 25% stroke, 50% stroke, 75% stroke, and 100% stroke, etc.), so as to more accurately detect whether internal oil leakage occurs in the overall oil-driven structure 40 under a high-pressure environment.

[0043] In some embodiments, determining whether the overall oil-driven structure 40 leaks oil in step S20 may include: during the multi-pressure pressure resistance test of the overall oil-driven structure 40, detecting whether external oil leakage occurs on the surface of the overall oil-driven structure 40; during the internal oil leakage test of the overall oil-driven structure 40, detecting whether internal oil leakage occurs in the oil return path of the overall oil-driven structure 40; when no external oil leakage occurs on the surface of the overall oil-driven structure 40 and no internal oil leakage occurs in the oil return path of the overall oil-driven structure 40, it is determined that the overall oil-driven structure 40 has no oil leakage.

[0044] In this embodiment, it is possible to determine whether external oil leakage occurs in the overall oil-driven structure 40 by using existing technologies or by visually observing whether there is oil on the surface of the overall oil-driven structure 40; and by detecting the flow rate at the oil return end of the overall oil-driven structure 40 with a flow meter to determine whether the flow rate at the oil return end of the overall oil-driven structure 40 is greater than a second set threshold. When the flow rate at the oil return end of the overall oil-driven structure 40 is greater than the first set threshold, it is determined that internal oil leakage occurs in the overall oil-driven structure 40.

[0045] It should be noted that an error of ±0.1 MPa is allowed during the maintenance of the first set pressure and the second set pressure.

[0046] Step S30 includes: performing a switch action test on the oil motor under test to determine whether there is an abnormal action of the oil motor under test. If not, execute S40. The function of this step is to detect whether there are abnormalities such as jamming and sticking during the switching of the valve 5 of the oil motor under test, so as to ensure that the oil motor under test can perform normal switch actions in subsequent detection steps.

[0047] In some embodiments, the on-off action test on the oil motor under test in step S30 may include: controlling the oil motor under test to perform a variety of preset on-off actions, and collecting the oil pressure and stroke curve sets of the oil motor under test during the action process. Among them, the preset on-off actions include at least one of slow close-open action, slow open-close action, fast close-open action, and fast open-close action.

[0048] It should be noted that the oil pressure and stroke of the oil motor under test during the action process can be collected by a pressure sensor 17 and a displacement sensor 18 respectively. Among them, the displacement amount sensed by the displacement sensor 18 can be converted into the valve opening through existing algorithms, which will not be elaborated here.

[0049] It should be noted that the slow close-open action means that the oil motor under test drives the valve 2 to switch from the fully closed position to the fully open position at a slow speed. The slow open-close action means that the oil motor under test drives the valve 2 to switch from the fully open position to the fully closed position at a slow speed. The fast close-open action means that the oil motor under test drives the valve 2 to switch from the fully closed position to the fully open position at a fast speed. The fast open-close action means that the oil motor under test drives the valve 2 to switch from the fully open position to the fully closed position at a fast speed.

[0050] In some embodiments, determining whether there is an abnormal action of the oil motor under test in step S30 may include: judging whether there is an abnormal action of the oil motor under test according to the oil pressure and stroke curve sets.

[0051] In this embodiment, the oil pressure and stroke curve sets include the oil pressure-stroke relationship curves and stroke-time relationship curves corresponding to each preset on-off action of the oil motor under test, that is, the oil pressure and stroke curve sets include 4 oil pressure-stroke relationship curves and 4 stroke-time relationship curves. In some embodiments, it is possible to judge whether there is an abnormal action of the oil motor under test according to the oil pressure and stroke curve sets by performing step S301, step S302, step S303, and step S304.

[0052] Step S301 includes: determining the action characteristic parameters and hysteresis corresponding to each preset on-off action according to the oil pressure and stroke curve sets; among them, the action characteristic parameters include full-closed oil pressure, full-open oil pressure, and action time.

[0053] The action time refers to the time required for the oil motor under test to complete a certain preset on-off action. For example, for the slow open-close action or the fast open-close action, the action time corresponds to the time required for the valve opening to switch from fully open to fully closed; for the slow close-open action or the fast close-open action, the action time corresponds to the time required for the valve opening to switch from fully closed to fully open.

[0054] Figure 4 are the oil pressure-stroke relationship curves corresponding to the fast close-open action and the fast open-close action in some embodiments of the present invention,Figure 5 is the stroke-time relationship curve corresponding to the quick closing and opening actions in some embodiments of the present invention. Specifically, taking the quick closing and opening actions as an example, please refer to Figure 4 , curve 61 represents the ideal curve, curve 62 represents the actual oil pressure-stroke relationship curve of the measured servomotor during the quick closing and opening actions, curve 63 represents the actual oil pressure-stroke relationship curve of the measured servomotor during the quick closing and opening actions. Based on curve 62, the full-closed oil pressure (i.e., the oil pressure when the valve opening is 0%) and the full-open oil pressure (i.e., the oil pressure when the valve opening is 100%) during the quick closing and opening actions can be determined. Please refer to Figure 5 , based on Figure 5 the action time (equal to T2 - T1) can be determined.

[0055] Among them, the times T1 and T2 can be determined in the following way (applicable to all stroke-time relationship curves): The change in the stroke acceleration of the measured servomotor is obtained through the displacement sensor 18. The moment when the stroke acceleration of the measured servomotor increases from close to zero to greater than the set stroke acceleration is defined as time T1, and the moment when the stroke acceleration of the measured servomotor decreases from greater than the set stroke acceleration to close to zero is defined as time T2.

[0056] Hysteresis refers to the maximum oil pressure difference at the same stroke during the upward and downward processes of the valve. Taking the quick closing and opening actions or the quick closing and opening actions as an example, please refer to Figure 5 , the hysteresis of both corresponds to the maximum vertical difference between curve 62 and curve 63, where the vertical difference refers to the difference between the ordinates of curve 62 and curve 63 at the same abscissa (i.e., the same valve opening).

[0057] For comparison, please refer to Figure 6 and Figure 7 , Figure 6 is the stroke-time relationship curve corresponding to the quick closing and opening actions in some embodiments of the present invention, Figure 7 is the stroke-time relationship curve corresponding to the slow closing and opening actions in some embodiments of the present invention. It can be understood that according to Figure 6 and Figure 7 the action times of the quick closing and opening actions and the slow closing and opening actions can be determined.

[0058] Furthermore, Tv is the time interval (abbreviated as the delay time) from when the main steam solenoid valve 13 or the control valve solenoid valve 26 receives the valve closing command to T1 during the quick closing and opening actions. Therefore, by calculating Tv + T2 - T1, the total time required for the quick closing and opening actions can be obtained. Correspondingly, the action characteristic parameters can also include the total time.

[0059] Step S302 includes: judging whether each characteristic parameter in the action characteristic parameters of each preset switching action is within the set allowable range corresponding to each characteristic parameter.

[0060] Specifically, taking the quick closing operation as an example, it is necessary to separately determine whether the full - closing oil pressure of the quick closing operation is within the preset full - closing allowable oil pressure range, whether the full - opening oil pressure is within the preset full - opening allowable oil pressure range, whether the operation time is within the preset quick - closing operation time range, whether the delay time is within the preset delay time range, whether the total time is within the preset total time range, and whether the hysteresis is within the preset hysteresis allowable range. It should be noted that various preset switch operations can share the same full - closing allowable oil pressure range, full - opening allowable oil pressure range, delay time range, total time range, and hysteresis allowable range, but the operation time needs to use the time range corresponding to the operation type. The slow - closing operation uses the preset slow - closing operation time range, the quick - opening and closing operation uses the preset quick - opening and closing operation time range, and the slow - opening and closing operation uses the preset slow - opening and closing operation time range.

[0061] In some embodiments, the hysteresis allowable range can be from - 0.7 Mpa to 0.7 Mpa.

[0062] Step S303 includes: further analyzing the smoothness of each stroke - time relationship curve in the oil pressure and stroke curve set to determine whether there are inflection points that meet the set conditions during the operation of the oil pressure and stroke curve set.

[0063] It can be understood that when there is jamming or sticking in the driving valve 5 of the measured oil motor, the stroke will remain unchanged within a certain period of time. The following steps can be executed to achieve smoothness analysis (applicable to all stroke - time relationship curves): Monitor the change in stroke acceleration of the stroke - time relationship curve during the period from T1 to T2, and determine whether there are several characteristic line segments during the period from T1 to T2 where the stroke acceleration is close to zero or remains within the set acceleration range; when there are the above - mentioned several characteristic line segments, determine whether the duration of each characteristic line segment is greater than the set duration; when there are no such characteristic line segments or the duration of all existing characteristic line segments is not greater than the set duration, it is determined that there are no inflection points that meet the set conditions in this stroke - time relationship curve, otherwise it is determined that there are inflection points that meet the set conditions in the stroke - time relationship curve.

[0064] It should be noted that only when all the stroke - time relationship curves included in the oil pressure and stroke curve set do not have inflection points that meet the set conditions, it will be determined that there are no inflection points that meet the set conditions during the operation of the oil pressure and stroke curve set. When any stroke - time relationship curve has an inflection point that meets the set conditions, it will be determined that there are inflection points that meet the set conditions during the operation of the oil pressure and stroke curve set.

[0065] Figure 8 is the stroke - time relationship curve when there is jamming or sticking during the valve operation in some embodiments of the present invention. Please refer to Figure 8 , 64 corresponds to the above - mentioned characteristic line segment, and the duration of the characteristic line segment is equal to T4 - T3.

[0066] Step S304 includes: when all characteristic parameters are respectively within the corresponding set allowable ranges and there are no inflection points that meet the set conditions in the oil pressure and stroke curve set during the operation, it is determined that the oil motor under test has no abnormal operation.

[0067] Step S40 includes: performing a step response test on the oil motor under test to determine whether the overshoot performance of the oil motor under test is qualified.

[0068] In some embodiments, step S40 may include step S401, step S402, step S403, step S404, and step S405.

[0069] Step S401 includes: controlling the oil motor under test to perform a back-and-forth step action between two preset target opening degrees. In this step, the oil motor under test will drive the opening degree of valve 5 to switch from the first preset target opening degree to the second preset target opening degree, and then switch back from the second preset target opening degree to the first preset target opening degree.

[0070] Step S402 includes: collecting the actual opening degree of the oil motor under test when it completes the back-and-forth step action. It can be understood that the actual opening degree can be determined by the displacement amount sensed by displacement sensor 18. In addition, "when completing the back-and-forth step action" refers to when step S401 is completed.

[0071] Step S403 includes: calculating the overshoot amount based on the actual opening degree and the preset target opening degree when completing the back-and-forth step action.

[0072] Among them, the expression formula of the overshoot amount can be: ; represents the overshoot amount, C1 represents the actual opening degree, and C2 represents the preset target opening degree when completing the back-and-forth step action (corresponding to the first preset target opening degree).

[0073] Step S404 includes: determining whether the overshoot amount is less than the set overshoot threshold. Optionally, the set range of the set overshoot threshold is 5% to 20%, and the set overshoot threshold is preferably 10%.

[0074] Step S405 includes: when the overshoot amount is less than the set overshoot threshold, it is determined that the overshoot performance of the oil motor under test is qualified.

[0075] Figure 9 is the stroke time relationship curve corresponding to the back-and-forth step action in some embodiments of the present invention. Please refer to Figure 9 , the oil motor under test will control the opening degree of valve 5 to switch from 20% (i.e., the first preset target opening degree) to 80% (the second preset target opening degree) and then back to 20%, It corresponds to the overshoot. Of course, the sizes of the two preset target opening degrees are not necessarily 20% and 80%, and other opening degrees can also be used. Specifically, it can be customized according to requirements.

[0076] Step S50 includes: when the overshoot performance of the measured oil motor is qualified, it is determined that the performance of the measured oil motor is qualified.

[0077] Figure 10 It is a schematic structural diagram of a nuclear power plant oil motor performance detection system in some embodiments of the present invention. The nuclear power plant oil motor performance detection system may include a control module 100 and a preset detection device 200.

[0078] The control module 100 includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the nuclear power plant oil motor performance detection method provided by the embodiments of the present invention; The preset detection device 200 is used to provide the oil pressure required for testing to the oil cylinder 41 and the overall oil driving structure 40, and measure the internal leakage oil volume of the oil cylinder 41 and the overall oil driving structure 40 during the test.

[0079] It should be noted that when performing step S10, please refer to Figure 11 , the preset detection device 200 needs to be directly mechanically connected to the oil cylinder 41. When performing steps S20 to S40, please refer to Figure 2 and Figure 3 , the preset detection device 200 needs to be mechanically connected to the oil cylinder 41 through the adjustment assembly 42.

[0080] Figure 11 It is a schematic structural diagram of a preset detection device in some embodiments of the present invention. In some embodiments, please refer to Figure 11 , the preset detection device 200 may include an oil storage container 31, an oil pump 32, a relief valve 33, a supply oil stop valve 34, a return oil stop valve 35, a flow measurement stop valve 36, a flowmeter 37, a temperature measurement module 38, and a pressure gauge 39.

[0081] The oil storage container 31 is used to store the test oil (i.e., high-pressure oil).

[0082] Please refer to Figure 2 , Figure 3 and Figure 11, the first end of the oil pump 32 is connected to the oil storage container 31, and the second end of the oil pump 32 is connected to the A chamber of the oil cylinder 41 or the oil supply end of the overall hydraulic structure 40 through the oil supply cut-off valve 34. The oil pump 32 is used to provide pressurizing power for the test oil input to the oil supply end of the oil cylinder 41 or the overall hydraulic structure 40. Specifically, the oil supply cut-off valve 34 is connected to one end of the first oil supply pipe 44, and the other end of the first oil supply pipe 44 is connected to the oil supply end of the overall hydraulic structure 40 through the first oil inlet cut-off valve 46 (or the second oil inlet cut-off valve 48). The first end of the oil return cut-off valve 35 is connected to the oil return end of the overall hydraulic structure 40 through the second oil supply pipe 45 and the oil outlet cut-off valve 47. In addition, the oil supply end of the overall hydraulic structure 40 of the main steam valve oil actuator corresponds to the input end of the main steam solenoid valve 13, and the oil return end of the overall hydraulic structure 40 of the main steam valve oil actuator corresponds to the oil return end of the oil cylinder 41. The oil supply end of the overall hydraulic structure 40 of the governor valve oil actuator corresponds to the input end of the governor valve solenoid valve 26, and the oil return end of the overall hydraulic structure 40 of the governor valve oil actuator corresponds to the oil return end of the oil cylinder 41 (B chamber outlet).

[0083] The overflow valve 33 is connected between the oil storage container 31 and the second end of the oil pump 32. The overflow valve 33 is used to adjust the oil pressure of the test oil according to the test requirements. Specifically, during the test, the control module 100 can control the start of the oil pump 32 and at the same time adjust the opening of the overflow valve 33. Adjusting the opening of the overflow valve 33 can control the overflow flow rate of the second end of the oil pump 32 through the overflow valve 33. Therefore, the oil pressure input to the oil cylinder 41 or the overall hydraulic structure 40 can be controlled, so that the oil cylinder 41 or the overall hydraulic structure 40 can be maintained at various first set pressures or second set pressures, thereby constructing the pressure environment required for performing steps S10 to S40.

[0084] The pressure gauge 39 is used to connect to the oil supply end of the oil cylinder 41 or the overall hydraulic structure 40. The pressure gauge 39 is used to measure the oil pressure at the oil supply end, which is convenient for the staff to observe the oil pressure input to the oil cylinder 41 or the overall hydraulic structure 40 in real time, so as to determine whether the oil cylinder 41 or the overall hydraulic structure 40 is maintained at a certain first set pressure or second set pressure. It is also convenient to turn off the oil pump 32 in time when the oil pressure is too high to avoid overpressure damage to the oil cylinder 41 or the overall hydraulic structure 40. Abnormalities of the overflow valve 33 or the oil pump 32 may both cause the oil pressure to be too high.

[0085] The first end of the oil return shut-off valve 35 is used to connect to the oil return end of the oil cylinder 41 or the overall hydraulic structure 40, and the second end of the oil return shut-off valve 35 is connected to the oil storage container 31. The oil return shut-off valve 35 is used to shut off when measuring internal oil leakage. It should be noted that during the process of controlling the oil pressure input to the oil cylinder 41 or the overall hydraulic structure 40, the control module 100 will control the oil return shut-off valve 35 to conduct. After the oil cylinder 41 or the overall hydraulic structure 40 is maintained at a certain first set pressure or second set pressure, it will be shut off according to the requirements of the controller. For example, during the internal oil leakage test, the control module 100 first controls the oil pump 32 to start, and at the same time adjusts the opening of the overflow valve 33 and controls the oil return shut-off valve 35 to conduct. When the oil cylinder 41 or the overall hydraulic structure 40 reaches the second set pressure, the oil return shut-off valve 35 is controlled to shut off, so as to maintain the oil pressure at the second set pressure. When it is necessary to measure the internal oil leakage flow rate, the oil return shut-off valve 35 is controlled to conduct.

[0086] One end of the flow measurement shut-off valve 36 is connected to the first end of the oil return shut-off valve 35, and the second end of the flow measurement shut-off valve 36 is connected to the oil storage container 31 via the flow meter 37. The flow measurement shut-off valve 36 is used to conduct when measuring internal oil leakage and shut off when determining external oil leakage.

[0087] The flow meter 37 is used to measure the flow rate of the internal oil leakage.

[0088] The temperature measurement module 38 is used to measure the temperature of the test oil and determine whether the temperature of the test oil is within the set temperature range. Specifically, the temperature measurement module 38 may include a thermometer and a warning unit. The thermometer is used to measure the temperature of the test oil. The warning unit is used to judge whether the temperature of the test oil is within the set temperature range, and output a prompt signal (such as an audible and visual prompt signal) when the temperature of the test oil is not within the set temperature range. Among them, the set temperature range can be 45±5°C. It should be noted that the temperature of the test oil is closely related to its viscosity. If the temperature of the test oil is too high, it will increase the risk of oil leakage, and it will also accelerate the aging of the oil seal and the test oil. If the temperature of the test oil is too low, it will increase the resistance of the oil motor, resulting in an increased risk of valve 5 jamming. Therefore, it is necessary to ensure that the test oil is maintained within the set temperature range.

[0089] It can be understood that the present invention can detect the performance characteristics of the oil motor in various dimensions such as leakage oil, actual action performance, and overshoot amount, and then accurately and comprehensively detect whether the performance of the oil motor is qualified. It can also detect the performance of the oil motor in the nuclear power plant without sending it for inspection, significantly shortening the maintenance cycle and reducing the maintenance cost. It also has the characteristics of comprehensive test items, which plays a positive role in improving the safety and economic benefits of the nuclear power plant.

[0090] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section.

[0091] Those skilled in the art can further realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of the examples have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0092] The steps of the methods or algorithms described in combination with the embodiments disclosed herein can be directly implemented by hardware, software modules executed by a processor, or a combination of the two. The software modules can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0093] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A method for detecting the performance of a steam turbine governor oil servo motor in a nuclear power plant, characterized in that, Including: S10. Conduct a leakage test on the oil cylinder of the oil servo to be measured to determine whether the oil cylinder leaks. If not, execute S20. Among them, the leakage includes internal leakage and external leakage. S20. Conduct a leakage test on the overall oil servo structure of the oil servo to be measured to determine whether the overall oil servo structure leaks. If not, execute S30. Among them, the overall oil servo structure includes the oil cylinder and an adjustment component connected to the oil cylinder. S30. Conduct a switch action test on the oil servo to be measured to determine whether there is an abnormal action of the oil servo to be measured. If not, execute S40. S40. Conduct a step response test on the oil servo to be measured to determine whether the overshoot performance of the oil servo to be measured is qualified. S50. When the overshoot performance of the oil servo to be measured is qualified, determine that the performance of the oil servo to be measured is qualified.

2. The method for detecting the performance of the oil motor in a nuclear power plant according to claim 1, wherein In S10 and S20, the leakage test includes a multi-pressure pressure resistance test and an internal leakage test. The multi-pressure pressure resistance test includes: by controlling the internal pressure of the oil cylinder or the input pressure of the overall oil servo structure, so that the oil cylinder or the overall oil servo structure respectively maintains for a corresponding time under a variety of first set pressures. The internal leakage test includes: by controlling the internal pressure of the oil cylinder or the input pressure of the overall oil servo structure, so that the oil cylinder or the overall oil servo structure is maintained under a second set pressure. When testing the overall oil servo structure, the stroke of the oil servo to be measured is also adjusted during the pressure maintenance period.

3. The method for detecting the performance of the oil motor in a nuclear power plant according to claim 2, wherein In S10, determining whether the oil cylinder leaks includes: during the multi-pressure pressure resistance test of the oil cylinder, detecting whether there is external leakage on the surface of the oil cylinder; during the internal leakage test of the oil cylinder, detecting whether there is internal leakage at the oil return end of the oil cylinder. When there is no external leakage on the surface of the oil cylinder and no internal leakage at the oil return end of the oil cylinder, it is determined that the oil cylinder has no leakage. In S20, determining whether the overall oil servo structure leaks includes: during the multi-pressure pressure resistance test of the overall oil servo structure, detecting whether there is external leakage on the surface of the overall oil servo structure; during the internal leakage test of the overall oil servo structure, detecting whether there is internal leakage in the oil return path of the overall oil servo structure. When there is no external leakage on the surface of the overall oil servo structure and no internal leakage in the oil return path of the overall oil servo structure, it is determined that the overall oil servo structure has no leakage.

4. The method for detecting the performance of the oil motor in a nuclear power plant according to claim 2, characterized in that, When conducting the multi-pressure pressure resistance test on the oil cylinder, the variety of first set pressures include 5 Mpa, 10 Mpa, 12 Mpa, 13.5 Mpa, and 18 Mpa. Among them, when the first set pressure is 5 Mpa, 10 Mpa, or 18 Mpa, the corresponding maintenance time is 8 minutes to 12 minutes; when the first set pressure is 12 Mpa, the corresponding maintenance time is 50 minutes to 70 minutes; when the first set pressure is 13.5 Mpa, the corresponding maintenance time is 25 minutes to 35 minutes. When performing the multi-pressure pressure resistance test on the overall oil-driven structure, the multiple first set pressures include 12 Mpa, 13.5 Mpa, and 18 Mpa. Among them, the holding time corresponding to the first set pressure of 12 Mpa is 50 minutes to 70 minutes, and the holding time corresponding to the first set pressure of 13.5 Mpa or 18 Mpa is 25 minutes to 35 minutes.

5. The method for detecting the performance of the oil motor in a nuclear power plant according to claim 1, wherein In step S30, the switch action test on the oil motor under test includes: controlling the oil motor under test to perform multiple preset switch actions, and collecting the oil pressure and stroke curve set of the oil motor under test during the action process; the preset switch actions include slow closing and opening actions, slow closing and opening actions, fast closing and opening actions, and fast closing and opening actions. Determining whether there is an abnormal action of the oil motor under test includes: judging whether there is an abnormal action of the oil motor under test according to the oil pressure and stroke curve set.

6. The method for detecting the performance of the oil motor in a nuclear power plant according to claim 5, wherein The judging whether there is an abnormal action of the oil motor under test according to the oil pressure and stroke curve set includes: Determining the action characteristic parameters and hysteresis of each preset switch action according to the oil pressure and stroke curve set; among them, the action characteristic parameters include full-closed oil pressure, full-open oil pressure, and action time. Judging whether each characteristic parameter in the action characteristic parameters of each preset switch action is within the set allowable range corresponding to each characteristic parameter. Also performing a smoothness analysis on the oil pressure and stroke curve set to determine whether there are inflection points that meet the set conditions during the action process of the oil pressure and stroke curve set. When all characteristic parameters are respectively within the corresponding set allowable ranges and there are no inflection points that meet the set conditions in the oil pressure and stroke curve set during the action process, it is determined that there is no abnormal action of the oil motor under test.

7. The method for detecting the performance of the oil motor in a nuclear power plant according to claim 1, characterized in that, Step S40 includes: Controlling the oil motor under test to perform a back-and-forth step action between two preset target openings; Collecting the actual opening of the oil motor under test when the back-and-forth step action is completed; Calculating the overshoot according to the actual opening and the preset target opening when the back-and-forth step action is completed; Judging whether the overshoot is less than the set overshoot threshold; When the overshoot is less than the set overshoot threshold, it is determined that the overshoot performance of the oil motor under test is qualified.

8. The method for detecting the performance of the oil motor in a nuclear power plant according to claim 7, wherein The expression of the overshoot is as follows: ; represents the overshoot, C1 represents the actual opening degree, and C2 represents the preset target opening degree when the back-and-forth step action is completed; The set range of the set overshoot threshold is 5% to 20%.

9. A performance detection system for a steam valve actuator in a nuclear power plant, characterized in that, Includes: A control module, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the nuclear power plant oil motor performance detection method according to any one of claims 1 to 8. A preset detection device for providing the oil pressure required for testing to the oil cylinder and the overall oil-driven structure, and measuring the internal leakage oil volume of the oil cylinder and the overall oil-driven structure during the test process.

10. The oil motor performance detection system for a nuclear power plant according to claim 9, characterized in that The preset detection device includes an oil storage container, an oil pump, a relief valve, a supply oil cut-off valve, a return oil cut-off valve, a flow measurement cut-off valve, a flowmeter, a temperature measurement module, and a pressure gauge. The oil storage container is used for storing test oil. The oil pump has its first end connected to the oil storage container and its second end connected to the oil cylinder or the oil supply end of the overall oil-driven structure via the oil supply cut-off valve, and is used to provide pressurizing power for the test oil input to the oil cylinder or the oil supply end of the overall oil-driven structure; The overflow valve is connected between the oil storage container and the second end of the oil pump, and is used to adjust the oil pressure of the test oil according to test requirements; The pressure gauge is used to connect to the oil supply end of the oil cylinder or the overall oil-driven structure and measure the oil pressure at the oil supply end; The oil return cut-off valve has its first end used to connect to the oil return end of the oil cylinder or the overall oil-driven structure and its second end connected to the oil storage container, and is used to shut off when measuring internal oil leakage; The flow measurement cut-off valve has one end connected to the first end of the oil return cut-off valve and its second end connected to the oil storage container via the flowmeter, and is used to conduct when measuring internal oil leakage and shut off when determining external oil leakage; The flowmeter is used to measure the flow rate of internal oil leakage; The temperature measurement module is used to measure the temperature of the test oil and determine whether the temperature of the test oil is within the set temperature range.

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