Performance testing method and system for oil motors in nuclear power plants

Abstract

The present invention relates to a method and system for detecting the performance of a nuclear power plant oil motor. The method comprises: S10, performing an oil leakage test on the oil cylinder of the oil motor under test to determine whether the oil cylinder is leaking oil, and if not, executing S20; S20, performing an oil leakage test on the entire oil motor structure under test to determine whether the entire oil motor structure is leaking oil, and if not, executing S30; S30, performing a switch action test on the oil motor under test to determine whether the oil motor under test has an abnormal operation, and if not, executing S40; S40, 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; S50, when the overshoot performance of the oil motor under test is qualified, determining that the performance of the oil motor under test is qualified. The present invention can accurately and comprehensively detect whether the performance of the oil motor under test is qualified in a 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 for nuclear power plants, and in particular to a method and system for detecting the performance of oil motors for nuclear power plants. Background Art

[0002] Oil-powered steam turbine generator units are key actuators responsible for the precise control of the main and regulating steam valves, directly impacting the power regulation and safe operation of nuclear power units. A single unit at a certain nuclear power plant is equipped with 16 oil-powered motors (8 for the main steam valves and 8 for the regulating steam valves). These motors' core integrated modules include precision hydraulic control components such as CVP / CVS cartridge valves, solenoid valves, and electro-hydraulic proportional valves. The oil circuit topology is highly complex, and assembly tolerances are stringent (micrometer-level). Maintenance quality directly impacts unit availability and nuclear safety risk levels, necessitating regular performance testing of these motors. Currently, the maintenance method at a certain nuclear power plant involves returning the oil-powered motors to the manufacturer for repair. However, each return repair is expensive (sometimes exceeding 4 million yuan), and the transportation distances are considerable (sometimes requiring cross-border transport), significantly increasing transportation risks. Furthermore, the entire repair process requires manual supervision and a long maintenance cycle, resulting in extremely high overall costs. Nuclear power plants urgently need a technical solution to reduce the overall cost of oil-powered 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 an oil motor in a nuclear power plant.

[0004] The technical solution adopted by the present invention to solve the technical problem is to construct a method for detecting the performance of an oil motor in a nuclear power plant, comprising:

[0005] S10, performing an oil leakage test on the oil cylinder of the oil motor to determine whether the oil cylinder is leaking oil, and if not, executing S20; wherein the oil leakage includes internal oil leakage and external oil leakage;

[0006] S20, performing an oil leakage test on the entire oil-powered structure of the tested oil motor to determine whether the entire oil-powered structure is leaking oil, and if not, executing S30; wherein the entire oil-powered structure includes the oil cylinder and an adjustment assembly connected to the oil cylinder;

[0007] S30, performing a switch action test on the tested oil motor to determine whether the tested oil motor has an abnormal action, and if not, executing S40;

[0008] S40, performing a step response test on the tested oil motor to determine whether the overshoot performance of the tested oil motor is qualified;

[0009] S50: When the overshoot performance of the tested oil motor is qualified, determine that the performance of the tested oil motor is qualified.

[0010] Preferably, in S10 and S20, the oil leakage test includes a multi-pressure withstand test and an internal oil leakage test;

[0011] The multi-pressure withstand test includes: controlling the internal pressure of the oil cylinder or the input pressure of the entire oil-powered structure so that the oil cylinder or the entire oil-powered structure maintains a plurality of first set pressures for corresponding periods of time;

[0012] The internal oil leakage test includes: controlling the internal pressure of the oil cylinder or the input pressure of the overall oil-powered structure to maintain the oil cylinder or the overall oil-powered structure at a second set pressure. When the overall oil-powered structure is tested, the stroke of the tested oil motor is also adjusted during the pressure maintenance period.

[0013] Preferably, in S10, determining whether the oil cylinder is leaking oil includes: detecting whether external oil leakage occurs on the surface of the oil cylinder during the multi-pressure withstand test of the oil cylinder; detecting whether internal oil leakage occurs at the oil return end of the oil cylinder during the internal oil leakage test of the oil cylinder; and determining that the oil cylinder is not leaking oil 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.

[0014] In S20, determining whether the integral oil-powered structure is leaking oil includes: detecting whether external oil leakage occurs on the surface of the integral oil-powered structure during the multi-pressure withstand test of the integral oil-powered structure; detecting whether internal oil leakage occurs in the oil return path of the integral oil-powered structure during the internal oil leakage test of the integral oil-powered structure; when there is no external oil leakage on the surface of the integral oil-powered structure and no internal oil leakage occurs in the oil return path of the integral oil-powered structure, determining that the integral oil-powered structure has no oil leakage.

[0015] Preferably, when the oil cylinder is subjected to the multi-pressure withstand test, the multiple first set pressures include 5 MPa, 10 MPa, 12 MPa, 13.5 MPa and 18 MPa, wherein the corresponding holding time when the first set pressure is 5 MPa, 10 MPa or 18 MPa is 8 minutes to 12 minutes, the corresponding holding time when the first set pressure is 12 MPa is 50 minutes to 70 minutes, and the corresponding holding time when the first set pressure is 13.5 MPa is 25 minutes to 35 minutes;

[0016] When the multi-pressure withstand test is performed on the overall oil-powered structure, the multiple first set pressures include 12Mpa, 13.5Mpa and 18Mpa, wherein the corresponding maintenance time when the first set pressure is 12Mpa is 50 minutes to 70 minutes, and the corresponding maintenance time when the first set pressure is 13.5Mpa or 18Mpa is 25 minutes to 35 minutes.

[0017] Preferably, in S30, the performing a switch action test on the tested oil motor includes: controlling the tested oil motor to perform a plurality of preset switch actions, and collecting a set of oil pressure and stroke curves of the tested oil motor during the actions; the preset switch actions include slow closing and opening action, slow opening and closing action, fast closing and opening action, and fast opening and closing action;

[0018] The determining whether the tested oil motor has an abnormal operation includes: judging whether the tested oil motor has an abnormal operation according to the oil pressure and stroke curve set.

[0019] Preferably, judging whether the tested oil motor has abnormal operation according to the oil pressure and stroke curve set includes:

[0020] Determining the action characteristic parameters and hysteresis of each of the preset switch actions according to the oil pressure and stroke curve set; wherein the action characteristic parameters include the fully closed oil pressure, the fully open oil pressure and the action time;

[0021] Determining whether each characteristic parameter of the action characteristic parameters of each preset switch action is within a setting allowable range corresponding to each characteristic parameter;

[0022] A smoothness analysis is also performed on the oil pressure and stroke curve set to determine whether there is an inflection point that meets set conditions during the operation of the oil pressure and stroke curve set;

[0023] When all characteristic parameters are respectively within the corresponding set allowable ranges and the oil pressure and stroke curve set does not have the inflection point that meets the set conditions during the operation process, it is determined that the tested oil motor has no abnormal operation.

[0024] Preferably, the S40 includes:

[0025] Controlling the oil motor under test to perform a step action back and forth between two preset target openings;

[0026] collecting the actual opening degree of the tested oil motor when completing the back-and-forth step action;

[0027] Calculating an overshoot according to the actual opening and a preset target opening when the back-and-forth step action is completed;

[0028] Determining whether the overshoot is less than a set overshoot threshold;

[0029] When the overshoot amount is less than a set overshoot threshold, it is determined that the overshoot performance of the tested oil motor is qualified.

[0030] Preferably, the overshoot is expressed as: ; represents the overshoot, C1 represents the actual opening, and C2 represents the preset target opening when the back-and-forth step action is completed;

[0031] The setting range of the overshoot threshold is 5% to 20%.

[0032] The present invention also provides a nuclear power plant oil motor performance detection system, comprising:

[0033] A control module comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for detecting performance of an oil motor in a nuclear power plant when executing the computer program;

[0034] A detection device is preset to provide the oil pressure required for testing the oil cylinder and the overall oil-powered structure, and to measure the internal oil leakage of the oil cylinder and the overall oil-powered structure during the test.

[0035] Preferably, the preset detection device includes an oil storage container, an oil pump, an overflow valve, an oil supply stop valve, an oil return stop valve, a flow measurement stop valve, a flow meter, a temperature measurement module and a pressure gauge;

[0036] The oil storage container is used to store test oil;

[0037] The oil pump has a first end connected to the oil storage container and a second end connected to the oil supply end of the oil cylinder or the integral oil-operated structure via the oil supply stop valve, and is used to provide pressurized power for the test oil input into the oil cylinder or the oil supply end of the integral oil-operated structure;

[0038] 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;

[0039] The pressure gauge is used to connect to the oil supply end of the oil cylinder or the integral oil-powered structure and is used to measure the oil pressure at the oil supply end;

[0040] The oil return shut-off valve has a first end connected to the oil return end of the oil cylinder or the integral oil-driven structure, and a second end connected to the oil storage container, and is used to shut off when measuring internal oil leakage;

[0041] The flow measurement stop valve has one end connected to the first end of the oil return stop valve and a second end connected to the oil storage container via the flow meter, and is used to be turned on when measuring internal oil leakage and turned off when determining external oil leakage;

[0042] The flow meter is used to measure the flow rate of internal oil leakage;

[0043] 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 a set temperature range.

[0044] The implementation of the present invention has the following beneficial effects: it provides a method for detecting the performance of oil motors in nuclear power plants, which can detect the performance characteristics of various dimensions of the oil motors, such as oil leakage, actual operation performance and overshoot, and then accurately and comprehensively detect whether the performance of the oil motors is qualified. It can also detect the performance of the oil motors in the nuclear power plant without sending them for inspection, which significantly shortens the maintenance cycle and reduces 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 nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0046] Figure 1 is a flowchart of a method for detecting performance of an oil motor in a nuclear power plant in some embodiments of the present invention;

[0047] Figure 2 This is a structural diagram of the main steam valve oil motor in a nuclear power plant;

[0048] Figure 3 This is a structural diagram of the oil motor for regulating steam valves in a nuclear power plant;

[0049] Figure 4 The oil pressure stroke relationship curve corresponding to the fast closing and opening action and the fast switching action in some embodiments of the present invention is shown;

[0050] Figure 5 is a travel-time relationship curve corresponding to the fast closing and opening action in some embodiments of the present invention;

[0051] Figure 6 is a travel-time relationship curve corresponding to the fast switch action in some embodiments of the present invention;

[0052] Figure 7 is a travel-time relationship curve corresponding to slow switch action in some embodiments of the present invention;

[0053] Figure 8 The relationship curve of travel time when the valve is stuck or jammed during operation in some embodiments of the present invention is shown;

[0054] Figure 9 is a travel-time relationship curve corresponding to a back-and-forth step action in some embodiments of the present invention;

[0055] Figure 10 Schematic diagram of the structure of a nuclear power plant oil motor performance detection system in some embodiments of the present invention;

[0056] Figure 11 It is a schematic structural diagram of a preset detection device in some embodiments of the present invention. DETAILED DESCRIPTION

[0057] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0058] It should be noted that the flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all content and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0059] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0060] Figure 1 The flowchart of the method for testing the performance of a nuclear power plant oil motor in some embodiments of the present invention is shown. The method can be used to test the performance of a nuclear power plant oil motor in a nuclear power plant, and has the advantages of high efficiency and comprehensive testing items.

[0061] It should be noted that the oil motors in nuclear power plants include but are not limited to main steam valve oil motors and regulating valve oil motors.

[0062] Figure 2 This is a schematic diagram of the main steam valve oil motor in a nuclear power plant. The main steam valve oil motor includes a 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 orifice 15, a second main steam throttle orifice 16, and a first industrial computer 11. It should be noted that the main steam valve oil motor's regulating assembly 42 includes the main steam cartridge valve 14, the main steam solenoid valve 13, the first main steam throttle orifice 15, and the second main steam throttle orifice 16.

[0063] The operating principle of the main steam valve oil motor is as follows: when the valve 5 opening command is received, the main steam solenoid valve 13 is energized, and the high-pressure oil passes through the main steam solenoid valve 13 to reach the large end of the main steam cartridge valve 14. Based on the design area difference of the main steam cartridge valve 14, under the action of the high-pressure oil, the main steam cartridge valve 14 is closed, and the high-pressure oil passes through the first main steam throttle hole 15 and the second main steam throttle hole 16 to reach the oil supply end of the cylinder 41 (that is, the high-pressure oil enters the A chamber) 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. Upon receiving the valve 5 closing command, solenoid valve 13 loses power, cutting off the oil supply to main steam solenoid valve 13. Main steam cartridge valve 14 connects to the oil return port of main steam solenoid valve 13, opening the main steam cartridge valve 14. High-pressure oil is connected to the oil return port of oil cylinder 41 through main steam cartridge valve 14. Under the action of spring 12, the oil source in chamber A is discharged to chamber B or the oil return port. Piston rod 43 moves rightward, and valve 5 is closed under the influence of spring 12. It should be noted that first industrial computer 11 is used to monitor the opening of valve 5 by detecting the displacement of piston rod 43 using displacement sensor 18, detecting the oil pressure in chamber A of oil cylinder 41 using pressure sensor 17, and sending a servo signal to main steam solenoid valve 13 to control the opening of valve 5.

[0064] Figure 3 This is a schematic diagram of the structure of a steam valve oil motor in a nuclear power plant. The steam valve oil motor includes a cylinder 41, a piston rod 43, a spring 12, a displacement sensor 18, a pressure sensor 17, a proportional control valve 21, a first steam valve throttle 22, a first steam valve cartridge valve 23, a second steam valve throttle 24, a second steam valve cartridge valve 25, a steam valve solenoid valve 26, and a second industrial computer 27. It should be noted that the regulating assembly 42 of the steam valve oil motor includes the proportional control valve 21, the first steam valve throttle 22, the first steam valve cartridge valve 23, the second steam valve throttle 24, the second steam valve cartridge valve 25, and the steam valve solenoid valve 26. It should be noted that the second industrial computer 27 functions similarly to the first industrial computer 11. The principle of controlling the steam valve oil motor can be found above or in the prior art and will not be elaborated on here.

[0065] The operating principle of the regulating steam valve oil motor is as follows: when the valve 5 is opened, the regulating steam valve solenoid valve 26 is controlled to be unpowered, and the high-pressure oil passes through the regulating steam valve solenoid valve 26 to reach the large end of the first regulating steam valve cartridge valve 23. Based on the design difference of the area of ​​the first regulating steam valve cartridge valve 23, under the action of high-pressure oil, the first regulating steam valve cartridge valve 23 is closed. When the second industrial computer 27 receives the opening instruction, the valve core of the proportional control valve 21 moves to the left and reaches the large end of the second regulating steam valve cartridge valve 25. Based on the design difference of the area of ​​the second regulating steam valve cartridge valve 25, under the action of high-pressure oil, the second regulating steam valve cartridge valve 25 is closed, and the high-pressure oil reaches the A chamber of the oil cylinder 41 through the second regulating steam 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. In the first closing mode of valve 5, the spool of proportional control valve 21 is controlled to move rightward, shutting off the high-pressure oil from proportional control valve 21 and opening the second regulating steam valve cartridge 25. Under the action of spring 12, the oil source in chamber A of cylinder 41 is discharged through the oil return port of proportional control valve 21 and the second regulating steam valve cartridge 25 to chamber B and the oil return port of cylinder 41. The piston rod 43 moves rightward, and the spring 12 drives valve 5 to close. In the second closing mode of valve 5, the regulating steam valve solenoid valve 26 is controlled to be energized, shutting off the oil flow to the first regulating steam valve cartridge 23, causing it to open. The large end of the second regulating steam valve cartridge 25 is connected to the oil return port of cylinder 41 through the first regulating steam valve cartridge 23. The second regulating steam valve cartridge 25 opens, and under the action of spring 12, the oil source in chamber A of cylinder 41 is discharged through the second regulating steam valve cartridge 25 to chamber B and the oil return port of cylinder 41. The piston rod 43 moves rightward, and the spring 12 drives valve 5 to close.

[0066] It should be noted that the structure of the oil cylinder 41, piston rod 43 and spring 12 of the main steam valve oil motor and the regulating valve oil motor is similar to the action principle of the driving valve 5, but there are differences in the adjustment components 42 of the two oil motors. For details, please refer to Figure 2 and Figure 3 However, the detection method provided by the present invention is applicable to both types of oil motors, and of course can also be applied to other oil motors.

[0067] See also Figure 1 The method for detecting the performance of the oil motor in a nuclear power plant may include step S10, step S20, step S30, step S40 and step S50.

[0068] Step S10 includes: performing an oil leakage test on the oil cylinder 41 of the tested oil motor to determine whether the oil cylinder 41 is leaking oil, and if not, executing S20; wherein, the oil leakage includes internal oil leakage and external oil leakage.

[0069] It should be noted that internal oil leakage usually refers to the phenomenon of high-pressure oil leaking from the inside of the hydraulic motor due to some valves not closing tightly. External oil leakage usually refers to the phenomenon of high-pressure oil leaking from the seals or gaps between components of the hydraulic motor to the outside of the hydraulic motor, which can usually be determined by visual inspection.

[0070] This step tests the oil cylinder 41 of the motor under test for oil leakage under various pressure conditions, ensuring normal performance before proceeding to subsequent testing steps. Furthermore, if oil leakage is detected in the oil cylinder 41 of the motor under test, the testing method can be suspended and the cylinder 41 repaired. Once the cylinder 41 is repaired, step S10 can be repeated to continue with the subsequent testing steps.

[0071] In some embodiments, the oil leakage test may include a multi-pressure withstand test and an internal oil leakage test.

[0072] The multi-pressure withstand test performed on the oil cylinder 41 may include: controlling the input pressure of the cylinder pressure of the oil cylinder 41 so that the oil cylinder 41 maintains a plurality of first set pressures for corresponding periods of time.

[0073] It can be understood that the purpose of the multi-pressure withstand test is to test whether the oil cylinder 41 has oil leakage under different pressure environments.

[0074] Furthermore, when the oil cylinder 41 is subjected to a multi-pressure withstand test, the multiple first set pressures include 5 MPa, 10 MPa, 12 MPa, 13.5 MPa, and 18 MPa. When the first set pressure is 5 MPa, 10 MPa, or 18 MPa, the corresponding holding time is 8 to 12 minutes, preferably 10 minutes. When the first set pressure is 12 MPa, the corresponding holding time is 50 to 70 minutes, preferably 60 minutes. When the first set pressure is 13.5 MPa, the corresponding holding time is 25 to 35 minutes, preferably 30 minutes. Of course, the magnitude of each first set pressure and the corresponding holding time can also be customized according to needs.

[0075] The internal oil leakage test of 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. The second set pressure may be set in a range of 10 MPa to 14 MPa, and preferably 12 MPa.

[0076] It can be understood that the internal oil leakage test is used to test whether the oil cylinder 41 has internal oil leakage under a high-pressure environment.

[0077] In some embodiments, determining whether the oil cylinder 41 is leaking oil in step S10 may include: detecting whether external oil leakage occurs on the surface of the oil cylinder 41 during a multi-pressure withstand test of the oil cylinder 41; detecting whether internal oil leakage occurs at the return oil end of the oil cylinder 41 during an 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 occurs at the return oil end of the oil cylinder 41, it is determined that the oil cylinder 41 has no oil leakage.

[0078] In this embodiment, whether there is oil on the surface of the oil cylinder 41 can be observed by existing technology or with the naked eye to determine whether the oil cylinder 41 has external oil leakage; and the flow rate at the return oil end of the oil cylinder 41 can be detected by a flow meter to determine whether the flow rate at the return oil end of the oil cylinder 41 is greater than a first set threshold. When the flow rate at the return oil end of the oil cylinder 41 is greater than the first set threshold, it is determined that the oil cylinder 41 has internal oil leakage.

[0079] Step S20 includes: performing an oil leakage test on the overall oil-powered structure 40 of the tested oil motor to determine whether the overall oil-powered structure 40 leaks oil, and if not, executing S30; wherein the overall oil-powered structure 40 includes an oil cylinder 41 and an adjustment assembly 42 connected to the oil cylinder 41.

[0080] This step tests the entire hydraulic system 40 of the tested hydraulic motor for oil leakage under various pressure conditions, ensuring normal performance before proceeding to subsequent testing steps. Furthermore, if oil leakage is detected, the testing method can be suspended and the hydraulic system 40 repaired. After the hydraulic system 40 is repaired, step S20 can be repeated to continue with subsequent testing steps.

[0081] In some embodiments, the multi-pressure withstand test performed on the integral oil structure 40 may include: controlling the input pressure of the integral oil structure 40 so that the integral oil structure 40 maintains a plurality of first set pressures for corresponding periods of time.

[0082] Furthermore, when the integrated oil-powered structure 40 is subjected to a multi-pressure withstand test, the various first set pressures include 12 MPa, 13.5 MPa, and 18 MPa. The corresponding holding time for a first set pressure of 12 MPa is 50 to 70 minutes, preferably 60 minutes. The corresponding holding time for a first set pressure of 13.5 MPa or 18 MPa is 25 to 35 minutes, preferably 30 minutes.

[0083] In some embodiments, the internal oil leakage test of the integral oil-powered structure 40 includes controlling the input pressure of the integral oil-powered structure 40 to maintain the integral oil-powered structure 40 at a second set pressure, and adjusting the stroke of the tested oil motor during the pressure maintenance period.

[0084] In this embodiment, 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 while maintaining the pressure, 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 the overall oil motor structure 40 has internal oil leakage under a high-pressure environment.

[0085] In some embodiments, determining whether the integral oil-powered structure 40 is leaking oil in step S20 may include: during a multi-pressure withstand test of the integral oil-powered structure 40, detecting whether external oil leakage occurs on the surface of the integral oil-powered structure 40; during an internal oil leakage test of the integral oil-powered structure 40, detecting whether internal oil leakage occurs in the oil return path of the integral oil-powered structure 40; when there is no external oil leakage on the surface of the integral oil-powered structure 40 and there is no internal oil leakage in the oil return path of the integral oil-powered structure 40, it is determined that the integral oil-powered structure 40 has no oil leakage.

[0086] In this embodiment, it is possible to use existing technology or the naked eye to observe whether there is oil on the surface of the integral oil-driven structure 40, thereby determining whether the integral oil-driven structure 40 has external oil leakage; and to use a flow meter to detect the flow rate of the return oil end of the integral oil-driven structure 40, to determine whether the flow rate of the return oil end of the integral oil-driven structure 40 is greater than a second set threshold value. When the flow rate of the return oil end of the integral oil-driven structure 40 is greater than the second set threshold value, it is determined that the integral oil-driven structure 40 has internal oil leakage.

[0087] 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.

[0088] Step S30 involves testing the motor's switching operation to determine if it exhibits any abnormalities. If not, the process proceeds to S40. This step detects whether the motor exhibits any abnormalities, such as stuck or jammed, during the opening and closing of valve 5, ensuring that the motor can operate normally in subsequent testing steps.

[0089] In some embodiments, performing a switching operation test on the tested oil motor in step S30 may include controlling the tested oil motor to perform a plurality of preset switching operations and collecting a set of oil pressure and stroke curves of the tested oil motor during the operations. The preset switching operations may include at least one of a slow closing and opening operation, a slow opening and closing operation, a fast closing and opening operation, and a fast opening and closing operation.

[0090] It should be noted that the oil pressure and stroke of the tested oil motor during operation can be respectively acquired by the pressure sensor 17 and the displacement sensor 18. The displacement sensed by the displacement sensor 18 can be converted into valve opening by existing algorithms, which will not be described in detail here.

[0091] It should be noted that the slow closing and opening action refers to the motor-driven valve 2 being switched from the fully closed position to the fully open position at a slow speed. The slow opening and closing action refers to the motor-driven valve 2 being switched from the fully open position to the fully closed position at a slow speed. The fast closing and opening action refers to the motor-driven valve 2 being switched from the fully closed position to the fully open position at a fast speed. The fast opening and closing action refers to the motor-driven valve 2 being switched from the fully open position to the fully closed position at a fast speed.

[0092] In some embodiments, determining whether the tested oil motor has abnormal operation in step S30 may include: judging whether the tested oil motor has abnormal operation according to the oil pressure and stroke curve set.

[0093] In this embodiment, the oil pressure and stroke curve set includes multiple oil pressure-stroke relationship curves and stroke-time relationship curves corresponding to each preset switching action of the tested oil motor, that is, the oil pressure and stroke curve set includes 4 oil pressure-stroke relationship curves and 4 stroke-time relationship curves.

[0094] In some embodiments, it is possible to determine whether the tested oil motor has abnormal operation according to the oil pressure and stroke curve set by executing steps S301, S302, S303 and S304.

[0095] Step S301 includes: determining the action characteristic parameters and hysteresis corresponding to each preset switch action according to the oil pressure and stroke curve set; wherein the action characteristic parameters include the fully closed oil pressure, the fully open oil pressure and the action time.

[0096] The action time refers to the time required for the tested oil motor to complete a preset switching action. For example, for slow switching action or fast switching action, the action time corresponds to the time required for the valve opening to change from fully open to fully closed; and for slow closing and opening action or fast closing and opening action, the action time corresponds to the time required for the valve opening to change from fully closed to fully open.

[0097] Figure 4 The oil pressure stroke relationship curve corresponding to the fast closing and opening action and the fast switching action in some embodiments of the present invention is shown in FIG. Figure 5 This is a travel-time relationship curve corresponding to the fast closing and opening action in some embodiments of the present invention. Specifically, taking the fast closing and opening action 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 tested oil motor during the fast closing and opening action, and curve 63 represents the actual oil pressure-stroke relationship curve of the tested oil motor during the fast opening and closing action. Based on curve 62, the fully closed oil pressure (i.e., the oil pressure when the valve opening is 0%) and the fully open oil pressure (i.e., the oil pressure when the valve opening is 100%) during the fast closing and opening action can be determined. Figure 5 ,based on Figure 5 The action time (equal to T2-T1) can be determined.

[0098] Among them, time T1 and T2 can be determined in the following way (applicable to all travel-time relationship curves): the travel acceleration change of the measured oil motor is obtained through the displacement sensor 18, and the moment when the travel acceleration of the measured oil motor increases from close to zero to greater than the set travel acceleration is defined as time T1, and the moment when the travel acceleration of the measured oil motor is greater than the set travel acceleration and drops to close to zero is defined as time T2.

[0099] Hysteresis refers to the maximum oil pressure difference at the same stroke of the valve during the upward and downward movement. Taking fast closing and opening action or fast switching action as an example, please refer to Figure 5 The hysteresis of both curves corresponds to the maximum vertical difference between curve 62 and curve 63, where the vertical difference refers to the difference between the vertical coordinates of curve 62 and curve 63 when the horizontal coordinates are the same (i.e., the valve opening is the same).

[0100] For comparison, see Figure 6 and Figure 7 , Figure 6 is a travel-time relationship curve corresponding to the fast switch action in some embodiments of the present invention, Figure 7 is a travel time relationship curve corresponding to the slow switch action in some embodiments of the present invention. It can be understood that according to Figure 6 and Figure 7 The actuation time of fast switching action and slow switching action can be determined.

[0101] Furthermore, Tv is the time interval (referred to as the delay time) between the main steam solenoid valve 13 or the regulating steam solenoid valve 26 receiving the valve closing command and T1 during the fast switching operation. Therefore, the total time required for the fast switching operation can be calculated by adding Tv to T2 - T1. Accordingly, the operation characteristic parameters can also include the total time.

[0102] Step S302 includes: determining whether each characteristic parameter of the action characteristic parameters of each preset switch action is within a setting allowable range corresponding to each characteristic parameter.

[0103] Specifically, taking the quick closing and opening action as an example, it is necessary to determine whether the full closing oil pressure of the quick closing and opening action 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 action time is within the preset quick closing and opening 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 switching actions 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 action time must use the time range corresponding to the action type. The slow closing and opening action uses the preset slow closing and opening time range, the fast opening action uses the preset fast opening and closing time range, and the slow opening and closing action uses the preset slow opening and closing time range.

[0104] In some embodiments, the hysteresis allowable range may be -0.7 MPa to 0.7 MPa.

[0105] Step S303 includes: performing a smoothness analysis on each travel-time relationship curve in the oil pressure and travel curve set to determine whether there is an inflection point in the oil pressure and travel curve set that meets the set conditions during the action process.

[0106] It can be understood that when the oil motor under test is stuck or jammed when driving the valve 5, the stroke will remain unchanged for a certain period of time. The smoothness analysis (applicable to all stroke-time relationship curves) can be achieved by performing the following steps: monitor the stroke acceleration change of the stroke-time relationship curve from T1 to T2, and determine whether there are several characteristic line segments in which the stroke acceleration is close to zero or remains within the set acceleration range during the period from T1 to T2; when the said several characteristic line segments exist, determine whether the duration of each characteristic line segment is greater than the set duration; when the said characteristic line segment does not exist or the duration of all existing characteristic line segments is not greater than the set duration, determine that the stroke-time relationship curve does not have an inflection point that meets the set conditions; otherwise, determine that the stroke-time relationship curve has an inflection point that meets the set conditions.

[0107] It should be noted that only when all the travel-time relationship curves included in the oil pressure and stroke curve set do not have inflection points that meet the set conditions, will it be determined that the oil pressure and stroke curve set does not have inflection points that meet the set conditions during the action process. When any travel-time relationship curve has an inflection point that meets the set conditions, it will be determined that the oil pressure and stroke curve set has an inflection point that meets the set conditions during the action process.

[0108] Figure 8 This is a travel-time relationship curve when the valve is stuck or stuck during operation in some embodiments of the present invention. Please refer to Figure 8 , 64 corresponds to the characteristic line segment, and the duration of the characteristic line segment is equal to T4-T3.

[0109] Step S304 includes: when all characteristic parameters are respectively within the corresponding set allowable ranges and the oil pressure and stroke curve set does not have an inflection point that meets the set conditions during the operation process, it is determined that the tested oil motor has no abnormal operation.

[0110] Step S40 includes: performing a step response test on the tested oil motor to determine whether the overshoot performance of the tested oil motor is qualified.

[0111] In some embodiments, step S40 may include step S401 , step S402 , step S403 , step S404 and step S405 .

[0112] Step S401 includes controlling the tested oil motor to perform a step-by-step motion between two preset target openings. In this step, the tested oil motor drives the valve 5 to open from the first preset target opening to the second preset target opening, and then switches from the second preset target opening back to the first preset target opening.

[0113] Step S402 includes collecting the actual opening degree of the tested oil motor when it completes the back-and-forth step motion. It is understood that the actual opening degree can be determined by the displacement sensed by displacement sensor 18. Furthermore, "when the back-and-forth step motion is completed" refers to the completion of step S401.

[0114] Step S403 includes calculating an overshoot according to the actual opening and a preset target opening when the back-and-forth step action is completed.

[0115] Among them, the expression of overshoot can be: ; C1 represents the overshoot, C2 represents the actual opening, and C1 represents the preset target opening when the back-and-forth step action is completed (corresponding to the first preset target opening).

[0116] Step S404 includes: determining whether the overshoot amount is less than a set overshoot threshold. Optionally, the setting range of the overshoot threshold is 5% to 20%, and the setting overshoot threshold is preferably 10%.

[0117] Step S405 includes: when the overshoot amount is less than a set overshoot threshold, determining that the overshoot performance of the tested oil motor is qualified.

[0118] Figure 9 This is a travel-time relationship curve corresponding to the back-and-forth step action in some embodiments of the present invention. Figure 9 The oil engine under test will control the valve 5 opening from 20% (the first preset target opening) to 80% (the second preset target opening) and then to 20%. Of course, the two preset target openings are not necessarily 20% and 80%, but can also be other openings, which can be customized according to needs.

[0119] Step S50 includes: when the overshoot performance of the tested oil motor is qualified, determining that the performance of the tested oil motor is qualified.

[0120] Figure 10 FIG. 1 is a schematic diagram of a nuclear power plant oil motor performance detection system according to 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.

[0121] 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, the steps of the method for detecting the performance of a nuclear power plant oil motor provided in an embodiment of the present invention are implemented.

[0122] The preset detection device 200 is used to provide the oil pressure required for testing to the oil cylinder 41 and the overall oil-powered structure 40, and to measure the internal oil leakage of the oil cylinder 41 and the overall oil-powered structure 40 during the test.

[0123] It should be noted that when executing step S10, please refer to Figure 11 , the preset detection device 200 needs to be directly mechanically connected to the cylinder 41. When executing steps S20 to S40, please refer to Figure 2 and Figure 3 , the preset detection device 200 needs to be mechanically connected to the cylinder 41 through the adjustment component 42.

[0124] Figure 11 is a schematic diagram of the structure of the 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, an oil supply stop valve 34, an oil return stop valve 35, a flow measurement stop valve 36, a flow meter 37, a temperature measurement module 38 and a pressure gauge 39.

[0125] The oil storage container 31 is used to store test oil (ie, high-pressure oil).

[0126] See also Figure 2 、 Figure 3 and Figure 11The first end of the oil pump 32 is connected to the oil reservoir 31, and the second end of the oil pump 32 is connected to chamber A of the oil cylinder 41 or the oil supply end of the integrated oil actuator 40 via the oil supply shutoff valve 34. The oil pump 32 is used to provide pressurized power for the test oil input to the oil cylinder 41 or the oil supply end of the integrated oil actuator 40. Specifically, the oil supply shutoff valve 34 is connected to one end of a first oil supply pipe 44. The other end of the first oil supply pipe 44 is connected to the oil supply end of the integrated oil actuator 40 via a first oil inlet shutoff valve 46 (or a second oil inlet shutoff valve 48). The first end of the oil return shutoff valve 35 is connected to the oil return end of the integrated oil actuator 40 via a second oil supply pipe 45 and an oil outlet shutoff valve 47. Furthermore, the oil supply end of the integrated oil actuator 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 integrated oil actuator 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 oil-operated structure 40 of the regulating steam valve oil motor corresponds to the input end of the regulating steam valve solenoid valve 26 , and the oil return end of the overall oil-operated structure 40 of the regulating steam valve oil motor corresponds to the oil return end (B chamber outlet) of the oil cylinder 41 .

[0127] The relief valve 33 is connected between the oil storage container 31 and the second end of the oil pump 32. The relief valve 33 is used to adjust the oil pressure of the test oil according to test requirements. Specifically, during the test process, the control module 100 can control the activation of the oil pump 32 and simultaneously adjust the opening of the relief valve 33. Adjusting the opening of the relief valve 33 controls the overflow flow rate from the second end of the oil pump 32 through the relief valve 33. Therefore, the oil pressure input to the oil cylinder 41 or the entire oil-operated structure 40 can be controlled, so that the oil cylinder 41 or the entire oil-operated structure 40 is maintained at a plurality of first set pressures or second set pressures, thereby establishing the pressure environment required for executing steps S10 to S40.

[0128] The pressure gauge 39 is used to connect the oil supply end of the oil cylinder 41 or the overall oil-powered structure 40. The pressure gauge 39 is used to measure the oil pressure at the oil supply end, so that the staff can observe the oil pressure input to the oil cylinder 41 or the overall oil-powered structure 40 in real time to determine whether the oil cylinder 41 or the overall oil-powered structure 40 is maintained at a first set pressure or a second set pressure. It is also convenient to shut down the oil pump 32 in time when the oil pressure is too high, so as to avoid overpressure damage to the oil cylinder 41 or the overall oil-powered structure 40. Abnormalities in the relief valve 33 or the oil pump 32 may cause excessive oil pressure.

[0129] The first end of the oil return shutoff valve 35 is connected to the oil return port of the oil cylinder 41 or the integrated oil-operated structure 40, and the second end of the oil return shutoff valve 35 is connected to the oil storage container 31. The oil return shutoff valve 35 is closed when measuring internal oil leakage. It should be noted that while controlling the oil pressure input to the oil cylinder 41 or the integrated oil-operated structure 40, the control module 100 controls the oil return shutoff valve 35 to be open. Only after the oil cylinder 41 or the integrated oil-operated structure 40 maintains a first set pressure or a second set pressure will the controller close it as needed. For example, when conducting an internal oil leakage test, the control module 100 first controls the oil pump 32 to start, simultaneously adjusting the opening of the relief valve 33 and controlling the oil return shutoff valve 35 to be open. When the oil cylinder 41 or the integrated oil-operated structure 40 reaches the second set pressure, the oil return shutoff valve 35 is controlled to close, thereby maintaining the oil pressure at the second set pressure. The oil return shutoff valve 35 is then controlled to be open only when the internal oil leakage flow rate needs to be measured.

[0130] One end of the flow measurement stop valve 36 is connected to the first end of the return oil stop valve 35, and the second end of the flow measurement stop valve 36 is connected to the oil storage container 31 via the flow meter 37. The flow measurement stop valve 36 is used to be turned on when measuring internal oil leakage and to be turned off when determining external oil leakage.

[0131] The flow meter 37 is used to measure the flow rate of the internal oil leakage.

[0132] 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 a set temperature range. Specifically, the temperature measurement module 38 may include a thermometer and an early warning unit. The thermometer is used to measure the temperature of the test oil. The early warning unit is used to determine whether the temperature of the test oil is within the set temperature range and output a prompt signal (such as an audible or visual prompt signal) if the temperature of the test oil is not within the set temperature range. The set temperature range may be 45±5°C. It should be noted that the temperature of the test oil is closely related to its viscosity. If the test oil temperature is too high, the risk of oil leakage will increase and the oil seal and test oil will age. If the test oil temperature is too low, the resistance of the oil motor will increase, resulting in an increased risk of valve 5 sticking. Therefore, it is necessary to ensure that the test oil remains within the set temperature range.

[0133] It can be understood that the present invention can detect the performance characteristics of various dimensions of the oil motor, such as oil leakage, actual operation performance and overshoot, 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, which significantly shortens the maintenance cycle and reduces 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 nuclear power plants.

[0134] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0135] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0136] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0137] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A method for detecting the performance of an oil motor in a nuclear power plant, characterized in that: include: S10, performing an oil leakage test on the oil cylinder of the oil motor to determine whether the oil cylinder is leaking oil, and if not, executing S20; wherein the oil leakage includes internal oil leakage and external oil leakage; S20, performing an oil leakage test on the entire oil-powered structure of the tested oil motor to determine whether the entire oil-powered structure is leaking oil, and if not, executing S30; wherein the entire oil-powered structure includes the oil cylinder and an adjustment assembly connected to the oil cylinder; S30, performing a switch action test on the tested oil motor to determine whether the tested oil motor has an abnormal action, and if not, executing S40; S40, performing a step response test on the tested oil motor to determine whether the overshoot performance of the tested oil motor is qualified; S50, when the overshoot performance of the tested oil motor is qualified, determining that the performance of the tested oil motor is qualified; In S10 and S20, the oil leakage test includes an internal oil leakage test; the internal oil leakage test includes: controlling the internal pressure of the oil cylinder or the input pressure of the integral oil-operated structure to maintain the oil cylinder or the integral oil-operated structure at a second set pressure; when the integral oil-operated structure is being tested, further adjusting the stroke of the oil motor under test during the pressure maintenance period; The step of determining whether the oil cylinder has internal oil leakage includes: detecting the flow rate of the oil return end of the oil cylinder, judging whether the flow rate of the oil return end of the oil cylinder is greater than a first set threshold, and if so, judging that the oil cylinder has internal oil leakage; The step of determining whether the integral oil-operated structure has internal oil leakage comprises: detecting the flow rate at the oil return end of the integral oil-operated structure, determining whether the flow rate at the oil return end of the integral oil-operated structure is greater than a second set threshold, and if so, determining that the integral oil-operated structure has internal oil leakage; During the execution of S10 to S40, the temperature of the test oil is also measured to determine whether the temperature of the test oil is within the set temperature range. If not, a prompt signal is output to prompt the temperature of the test oil to be maintained within the set temperature range.

2. The method for detecting the performance of an oil motor in a nuclear power plant according to claim 1, wherein: In said S10 and said S20, said oil leakage test further comprises a multi-pressure withstand test; The multi-pressure withstand test includes: controlling the internal pressure of the oil cylinder or the input pressure of the overall oil-powered structure so that the oil cylinder or the overall oil-powered structure maintains a plurality of first set pressures for corresponding periods of time.

3. The method for detecting the performance of an oil motor in a nuclear power plant according to claim 2, characterized in that: In S10, determining whether the oil cylinder is leaking oil includes: detecting whether external oil leakage occurs on the surface of the oil cylinder during the multi-pressure withstand test of the oil cylinder; detecting whether internal oil leakage occurs at the oil return end of the oil cylinder during the internal oil leakage test of the oil cylinder; and determining that the oil cylinder is not leaking oil 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. In S20, determining whether the integral oil-powered structure is leaking oil includes: detecting whether external oil leakage occurs on the surface of the integral oil-powered structure during the multi-pressure withstand test of the integral oil-powered structure; detecting whether internal oil leakage occurs in the oil return path of the integral oil-powered structure during the internal oil leakage test of the integral oil-powered structure; when there is no external oil leakage on the surface of the integral oil-powered structure and no internal oil leakage occurs in the oil return path of the integral oil-powered structure, determining that the integral oil-powered structure has no oil leakage.

4. The method for detecting the performance of an oil motor in a nuclear power plant according to claim 2, wherein: When the multi-pressure withstand test is performed on the oil cylinder, the multiple first set pressures include 5 MPa, 10 MPa, 12 MPa, 13.5 MPa and 18 MPa, wherein the corresponding holding time when the first set pressure is 5 MPa, 10 MPa or 18 MPa is 8 minutes to 12 minutes, the corresponding holding time when the first set pressure is 12 MPa is 50 minutes to 70 minutes, and the corresponding holding time when the first set pressure is 13.5 MPa is 25 minutes to 35 minutes; When the multi-pressure withstand test is performed on the overall oil-powered structure, the multiple first set pressures include 12Mpa, 13.5Mpa and 18Mpa, wherein the corresponding maintenance time when the first set pressure is 12Mpa is 50 minutes to 70 minutes, and the corresponding maintenance time when the first set pressure is 13.5Mpa or 18Mpa is 25 minutes to 35 minutes.

5. The method for detecting the performance of an oil motor in a nuclear power plant according to claim 1, wherein: In S30, the switching action test of the tested oil motor includes: controlling the tested oil motor to perform a plurality of preset switching actions, and collecting a set of oil pressure and stroke curves of the tested oil motor during the actions; the preset switching actions include slow closing and opening action, slow opening and closing action, fast closing and opening action, and fast opening and closing action; The determining whether the tested oil motor has an abnormal operation includes: judging whether the tested oil motor has an abnormal operation according to the oil pressure and stroke curve set.

6. The method for detecting the performance of an oil motor in a nuclear power plant according to claim 5, characterized in that: The step of determining whether the tested oil motor has abnormal operation according to the oil pressure and stroke curve set includes: Determining the action characteristic parameters and hysteresis of each of the preset switch actions according to the oil pressure and stroke curve set; wherein the action characteristic parameters include the fully closed oil pressure, the fully open oil pressure and the action time; Determining whether each characteristic parameter of the action characteristic parameters of each preset switch action is within a setting allowable range corresponding to each characteristic parameter; A smoothness analysis is also performed on the oil pressure and stroke curve set to determine whether there is an inflection point that meets set conditions during the operation of the oil pressure and stroke curve set; When all characteristic parameters are respectively within the corresponding set allowable ranges and the oil pressure and stroke curve set does not have the inflection point that meets the set conditions during the operation process, it is determined that the tested oil motor has no abnormal operation.

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

8. The method for detecting the performance of an oil motor in a nuclear power plant according to claim 7, characterized in that: The expression 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 action is completed; The setting range of the overshoot threshold is 5% to 20%.

9. A nuclear power plant oil motor performance detection system, characterized in that: include: A control module comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for detecting performance of an oil motor in a nuclear power plant according to any one of claims 1 to 8 when executing the computer program; A detection device is preset to provide the oil pressure required for testing the oil cylinder and the overall oil-powered structure, and to measure the internal oil leakage of the oil cylinder and the overall oil-powered structure during the test.

10. The nuclear power plant oil motor performance detection system according to claim 9, characterized in that: The preset detection device includes an oil storage container, an oil pump, an overflow valve, an oil supply stop valve, an oil return stop valve, a flow measurement stop valve, a flow meter, a temperature measurement module and a pressure gauge; The oil storage container is used to store test oil; The oil pump has a first end connected to the oil storage container and a second end connected to the oil supply end of the oil cylinder or the integral oil-operated structure via the oil supply stop valve, and is used to provide pressurized power for the test oil input into the oil cylinder or the oil supply end of the integral oil-operated 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 integral oil-powered structure and to measure the oil pressure at the oil supply end; The oil return shut-off valve has a first end connected to the oil return end of the oil cylinder or the integral oil-driven structure, and a second end connected to the oil storage container, and is used to shut off when measuring internal oil leakage; The flow measurement stop valve has one end connected to the first end of the oil return stop valve and a second end connected to the oil storage container via the flow meter, and is used to be turned on when measuring internal oil leakage and turned off when determining external oil leakage; The flow meter 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 a set temperature range.

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