Automatic calibration method and system for pressure sensor of nuclear power plant

Abstract

The invention relates to an automatic calibration method and system for a pressure sensor of a nuclear power plant. The method comprises the following steps: acquiring calibration parameters of the calibrated pressure sensor; wherein the calibration parameters comprise a calibration range and the number of verification points; determining a pressure point value corresponding to each check point according to the calibration range and the number of the check points; pressurization calibration processing is sequentially carried out based on each calibration point, and the pressurization calibration processing comprises the steps that pressurization control signals are output according to the pressure point values of the calibration points so as to control a pressure control device to pressurize a calibrated pressure sensor and a metering sensor; acquiring a first real-time measurement pressure of the metering sensor; judging whether the first real-time measurement pressure is equal to or approximate to the pressure point value, if so, stopping outputting the pressurization control signal, obtaining the current measurement pressure of the calibrated pressure sensor, and determining the current measurement pressure as the test pressure corresponding to the calibration point in the pressurization process; and generating a calibration result according to the test pressure of each verification point. According to the invention, the pressure sensor can be automatically calibrated.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant equipment maintenance, and in particular to a nuclear power plant pressure sensor automatic calibration method and system. Background Art

[0002] In nuclear power plants, there are a large number of pressure sensors used to measure process medium pressure in both the nuclear island and the conventional island. However, the traditional pressure sensor calibration method usually requires manual operation, the calibration process is complicated and the accuracy is difficult to guarantee. In addition, due to the limitations of manual operation, the calibration not only takes a lot of manual time, but the report generation is often not timely and accurate, which brings many inconveniences to the production management of enterprises. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for automatically calibrating a pressure sensor in a nuclear power plant.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a nuclear power plant pressure sensor automatic calibration method, comprising:

[0005] Acquire calibration parameters of the calibrated pressure sensor; wherein the calibration parameters include a calibration range and a number of calibration points;

[0006] Determine the pressure point value corresponding to each check point according to the calibration range and the number of check points;

[0007] Performing a pressurization calibration process in sequence based on each of the calibration points, the pressurization calibration process comprising: outputting a pressurization control signal according to the pressure point value of the calibration point to control a pressure control device to pressurize the calibrated pressure sensor and the metering sensor at the same time; obtaining a first real-time measured pressure of the metering sensor; determining whether the first real-time measured pressure is equal to or close to the pressure point value; when the first real-time measured pressure is equal to or close to the pressure point value, stopping outputting the pressurization control signal, and obtaining a current measured pressure of the calibrated pressure sensor, and determining the current measured pressure as the test pressure corresponding to the calibration point in the pressurization process;

[0008] A calibration result is generated according to the test pressure of each of the calibration points.

[0009] Preferably, the step of determining the pressure point value corresponding to each check point according to the calibration parameters comprises:

[0010] The pressure point value corresponding to each calibration point is calculated using the following expression:

[0011]

[0012] Where p(1) represents the pressure point value corresponding to the first checkpoint, p(k) represents the pressure point value corresponding to the kth checkpoint, p(n) represents the pressure point value corresponding to the nth checkpoint, and R min Indicates the lower limit of the calibration range, R max represents the upper limit of the calibration range, and n represents the number of check points.

[0013] Preferably, the pressurization calibration process further includes:

[0014] Calculating a first pressure difference between the first real-time measured pressure and the pressure point value;

[0015] Determining whether the first pressure difference is within a first set range;

[0016] When the first pressure difference is within the first set range, the pressurization control signal is adjusted to control the pressurization rate of the pressure control device to decrease.

[0017] Preferably, the automatic calibration method for a nuclear power plant pressure sensor further comprises:

[0018] Based on each of the check points, a pressure relief calibration process is performed in sequence, and the pressure relief calibration process includes:

[0019] Output a pressure relief control signal according to the pressure point value of the calibration point to control the pressure control device to relieve pressure on the calibrated pressure sensor and the metering sensor at the same time; obtain a second real-time measured pressure of the metering sensor; determine whether the second real-time measured pressure is equal to or close to the pressure point value; when the second real-time measured pressure is equal to or close to the pressure point value, stop outputting the pressure relief control signal, obtain the current measured pressure of the calibrated pressure sensor, and determine the current measured pressure as the test pressure corresponding to the pressure point value during the pressure relief process.

[0020] Preferably, the pressure relief calibration process further includes:

[0021] Calculating a second pressure difference between the second real-time measured pressure and the pressure point value;

[0022] Determining whether the second pressure difference is within a second set range;

[0023] When the second pressure difference is within the second set range, the pressure relief control signal is adjusted to control the pressure relief rate of the pressure control device to decrease.

[0024] Preferably, the automatic calibration method for a nuclear power plant pressure sensor further comprises:

[0025] According to the magnitude of the pressure point value of each of the check points, the pressurization calibration process is performed in sequence from small to large;

[0026] After the pressurization calibration process is completed at all the check points, the pressure relief calibration process is performed in sequence from large to small according to the pressure point values ​​of the check points.

[0027] Preferably, the step of generating a calibration result according to the test pressure of each pressure point value comprises:

[0028] For each of the test pressures, the following steps are performed: calculating an error value between the test pressure and the corresponding real-time measured pressure; determining whether the error value is within a third set range; when the error value is within the third set range, determining that the test pressure meets the standard; when the error value is not within the third set range, determining that the test pressure does not meet the standard;

[0029] If all the test pressures meet the standards, the calibrated pressure sensor is determined to be calibrated properly, and a corresponding calibration report is output;

[0030] If at least one of the test pressures does not meet the standard, the calibrated pressure sensor is determined to be unqualified and a corresponding calibration report is output.

[0031] Preferably, the third setting range is from -0.5% to 0.5%.

[0032] Preferably, the automatic calibration method for a nuclear power plant pressure sensor further comprises:

[0033] When the calibrated pressure sensor is determined to be unqualified for calibration, the zero point and / or the range of the calibrated pressure sensor is corrected.

[0034] The present invention also constructs an automatic calibration system for a nuclear power plant pressure sensor, comprising:

[0035] Metering sensors;

[0036] pressure control devices; and

[0037] The control device comprises 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 automatic calibration method for the pressure sensor of a nuclear power plant described above are implemented.

[0038] The implementation of the present invention has the following beneficial effects: providing a method for automatic calibration of a pressure sensor in a nuclear power plant, firstly obtaining the calibration range and the number of check points of the calibrated pressure sensor, then determining the pressure point value corresponding to each check point according to the calibration range and the number of check points, then performing pressurization calibration processing based on each check point in turn, and finally generating a calibration result according to the test pressure of each check point. The present invention can automatically calibrate the pressure sensor and automatically generate the calibration result, which not only reduces the difficulty and cost of manual operation, but also has the advantage of high calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0040] Figure 1 is a flowchart of a method for automatic calibration of a pressure sensor in a nuclear power plant in some embodiments of the present invention;

[0041] Figure 2 is a schematic diagram of a calibration report in some embodiments of the present invention;

[0042] Figure 3 It is a structural diagram of a nuclear power plant pressure sensor automatic calibration system in some embodiments of the present invention. DETAILED DESCRIPTION

[0043] 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.

[0044] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0045] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may 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.

[0046] The present invention provides a method for automatically calibrating a pressure sensor in a nuclear power plant, which can automatically calibrate the pressure sensor and has the advantage of high calibration accuracy. Figure 1 The automatic calibration method for a nuclear power plant pressure sensor may include step S10, step S20, step S30 and step S40.

[0047] Step S10 includes: obtaining calibration parameters of the calibrated pressure sensor; wherein the calibration parameters include a calibration range and a number of checkpoints. In this step, the calibration range is used to limit the pressure range of the checkpoints of the calibrated pressure sensor. For example, when the calibration range is set to 1Mpa to 2Mpa, all checkpoints are within 1Mpa to 2Mpa. The number of checkpoints is used to set the total number of checkpoints within the calibration range. For example, when the number of checkpoints is 5, 5 checkpoints will be set within the calibration range.

[0048] In some embodiments, the calibration parameters may be obtained in the following manner: the calibration parameters are generated according to the operation of the staff on the human-computer interaction unit, wherein the human-computer interaction unit includes but is not limited to a mouse, a keyboard, a voice control device, and the like.

[0049] Step S20 includes: determining the pressure point value corresponding to each check point according to the calibration range and the number of check points.

[0050] In some embodiments, the step of determining the pressure point value corresponding to each check point according to the calibration parameters may include: calculating the pressure point value corresponding to each check point by the following expression:

[0051]

[0052] Where p(1) represents the pressure point value corresponding to the first checkpoint, p(k) represents the pressure point value corresponding to the kth checkpoint, p(n) represents the pressure point value corresponding to the nth checkpoint, and R min Indicates the lower limit of the calibration range, R max Indicates the upper limit of the calibration range, n indicates the number of calibration points, and n is a natural number not less than 3.

[0053] This embodiment allows the staff to input the calibration range and the number of check points, and then quickly and automatically determine the pressure point value corresponding to each check point according to the calibration range and the number of check points, which provides great convenience. In addition, the pressure difference between adjacent check points determined by this embodiment is equal, which can avoid the pressure point values ​​of each check point being too dispersed or concentrated, making the distribution of each pressure point value more regular and uniform, which helps to improve the calibration accuracy.

[0054] Step S30 includes: performing pressurization calibration processing in sequence based on each calibration point, and the pressurization calibration processing includes: outputting a pressurization control signal according to the pressure point value of the calibration point to control the pressure control device to pressurize the calibrated pressure sensor and the metering sensor at the same time; obtaining the first real-time measured pressure of the metering sensor; judging whether the first real-time measured pressure is equal to or close to the pressure point value; when the first real-time measured pressure is equal to or close to the pressure point value, stopping outputting the pressurization control signal, and obtaining the current measured pressure of the calibrated pressure sensor, and determining the current measured pressure as the test pressure corresponding to the calibration point in the pressurization process. In this step, when the difference between the first real-time measured pressure and the pressure point value is within the set pressure range, it can be determined that the first real-time measured pressure is equal to or close to the pressure point value, wherein the set pressure range can be -0.008Mpa to 0.008Mpa.

[0055] In some embodiments, the pressurization calibration process may also include: calculating a first pressure difference between a first real-time measured pressure and the pressure point value; determining whether the first pressure difference is within a first set range; when the first pressure difference is within the first set range, adjusting the pressurization control signal to control the pressurization rate of the pressure control device to decrease.

[0056] It should be noted that, based on the differences in sensor acquisition accuracy and damping time settings, a too fast pressure injection rate will cause errors in the indications of the calibrated pressure sensor and the metering sensor, and the error increases with the rate of change of pressure change. The present application is mainly used in nuclear power plants, where safety requirements are high and equipment has multiple protections. Instruments with the same control function often use multiple instruments for redundant control. A slight deviation may determine that the instrument is unavailable. Therefore, the accuracy of the pressure sensor is required to be high. Some pressure parameters involve the control of the real-time operating conditions of the unit, such as turbine pressure. If the error causes one of the pressure transmitters measuring the steam inlet pressure of the turbine to be in a state of large pressure deviation, the error of the pressure sensor will cause the turbine control and protection functions to be degraded, which may reduce the economic benefits of the nuclear power plant. Therefore, the present invention has high requirements for the accuracy performance of the pressure sensor. By slowly injecting pressure and gradually approaching the pressure point value, such errors can be eliminated and the calibration accuracy of the pressure sensor can be improved.

[0057] Optionally, the first setting range is -0.1 MPa to 0.1 MPa.

[0058] Furthermore, in some embodiments, the step of adjusting the pressurization control signal to control the pressure control device to reduce the pressurization rate may include: adjusting the pressurization control signal to control the pressure control device to gradually reduce the pressurization rate, and when the pressurization rate drops to the set pressurization rate, stop reducing the pressurization rate and maintain the current pressurization rate until the first real-time measured pressure is equal to or close to the corresponding pressure point value, and then stop outputting the pressurization control signal. In this embodiment, gradually reducing the pressurization rate can not only reduce the impact and wear on the equipment (including the pressure device and the sensor) caused by the sudden change of pressure, but also reduce the pressure fluctuation during the test, which is helpful to improve the calibration accuracy.

[0059] Since some pressure sensors may have errors in their measurement accuracy during the pressure increase and pressure relief process, in order to avoid unnecessary hidden dangers and accidents caused by such errors, in some embodiments, such as Figure 1 As shown, the automatic calibration method for the pressure sensor of a nuclear power plant may also include: step S31, performing pressure relief calibration processing in sequence based on each verification point, wherein the pressure relief calibration processing includes: outputting a pressure relief control signal according to the pressure point value of the verification point to control the pressure control device to simultaneously relieve pressure on the calibrated pressure sensor and the metering sensor; obtaining a second real-time measured pressure of the metering sensor; determining whether the second real-time measured pressure is equal to or close to the pressure point value; when the second real-time measured pressure is equal to or close to the pressure point value, stopping outputting the pressure relief control signal, and obtaining the current measured pressure of the calibrated pressure sensor, and determining the current measured pressure as the test pressure corresponding to the pressure point value in the pressure relief process.

[0060] In some embodiments, the pressure relief calibration process may also include: calculating a second pressure difference between a second real-time measured pressure and the pressure point value; determining whether the second pressure difference is within a second set range; when the second pressure difference is within the second set range, adjusting the pressure relief control signal to control the pressure relief rate of the pressure control device to decrease.

[0061] It should be noted that the purpose and beneficial effect of reducing the pressure relief rate are similar to those of reducing the pressurization rate, and will not be elaborated here.

[0062] Optionally, the second setting range is -0.1 MPa to 0.1 MPa.

[0063] Further, in some embodiments, the step of adjusting the pressure relief control signal to control the pressure relief rate of the pressure control device to decrease may include: adjusting the pressure relief control signal to control the pressure relief rate of the pressure control device to gradually decrease, and when the pressure relief rate drops to the set pressure relief rate, stopping reducing the pressure relief rate and maintaining the current pressure relief rate, until the second real-time measured pressure is equal to or close to the corresponding pressure point value, and then stopping outputting the pressurization control signal.

[0064] In order to simplify the entire calibration process and improve the calibration efficiency, in some embodiments, the automatic calibration method of the nuclear power plant pressure sensor may also include: performing pressurization calibration processing in sequence from small to large according to the size of the pressure point value of each verification point; after the pressurization calibration processing performed on all verification points is completed, performing pressure relief calibration processing in sequence from large to small according to the size of the pressure point value of each verification point.

[0065] Step S40 includes: generating a calibration result according to the test pressure of each calibration point.

[0066] In some embodiments, the step of generating a calibration result based on the test pressure of each pressure point value may include: for each test pressure: calculating the error value between the test pressure and its corresponding real-time measured pressure; determining whether the error value is within a third set range; when the error value is within the third set range, determining that the test pressure meets the standard; when the error value is not within the third set range, determining that the test pressure does not meet the standard; if all test pressures meet the standard, determining that the calibrated pressure sensor is calibrated properly, and outputting a corresponding calibration report; if there is at least one test pressure that does not meet the standard, determining that the calibrated pressure sensor is calibrated unqualified, and outputting a corresponding calibration report.

[0067] It should be noted that this embodiment is applicable to the test pressure determined after executing step S30 and step S31, and in this embodiment, when a certain test pressure (referred to as test pressure E) is the test pressure of the pressurization process determined by a certain check point in step S30 after the pressurization calibration process, then the real-time measurement pressure corresponding to the test pressure E is the first real-time measurement pressure obtained during the pressurization calibration process of the test pressure E. Similarly, when a certain test pressure (referred to as test pressure F) is the test pressure of the pressure relief process determined by a certain check point in step S31 after the pressure relief calibration process, the real-time measurement pressure corresponding to the test pressure F is the second real-time measurement pressure obtained when the test pressure E is subjected to the pressure relief calibration process.

[0068] In some embodiments, the error value can be calculated by the following expression: A = (P1-P2) / R, where A represents the error value, P1 represents the pressure point value, P2 represents the real-time measured pressure, and R represents the width of the calibration range (such as when the calibration range is 1 to 2Mpa, the width of the calibration range is equal to 2Mpa minus 1Mpa).

[0069] Optionally, the third setting range is from -0.5% to 0.5%.

[0070] In some embodiments, the automatic calibration method of the nuclear power plant pressure sensor may further include: when the calibrated pressure sensor is determined to be unqualified for calibration, the zero point and / or the range of the calibrated pressure sensor is corrected. Since the nuclear power plant has various types of pressure sensors, for some new pressure sensors, since they have software calibration functions, the purpose of adjusting the zero point and / or the range can be achieved by sending a correction signal to the pressure sensor; for some old pressure sensors, since their zero point and range require adjustment of the corresponding hardware (such as a potentiometer) to achieve, the staff needs to manually correct the zero point and / or the range.

[0071] Furthermore, the automatic calibration method for a nuclear power plant pressure sensor may also include: after correcting the zero point and / or range of the calibrated pressure sensor, returning to the starting step, and sequentially executing steps S10 to S40 to determine whether the corrected calibrated pressure sensor meets the requirements.

[0072] In order to facilitate the staff to check the calibration structure, in some embodiments, the calibration report is also displayed in the form of a table. Figure 2 , Figure 2The nominal value column corresponds to the pressure point value of each calibration point; the actual value column corresponds to the first real-time measured pressure output by the metering sensor when the pressure calibration or pressure relief calibration is performed at each calibration point; the minimum allowable value column corresponds to the theoretical value of the output current signal when the error value between the test pressure of the calibrated pressure sensor and its corresponding real-time measured pressure is exactly equal to the lower limit value of the third set range when the pressure calibration or pressure relief calibration is performed at each calibration point, which can be understood as the minimum output current value allowed by the calibrated pressure sensor under the pressure point value of the corresponding calibration point; the maximum allowable value column corresponds to the maximum allowable value of each calibration point. When the pressure calibration or pressure relief calibration is performed at each calibration point, when the error value between the test pressure of the calibrated pressure sensor and the corresponding real-time measured pressure is exactly equal to the upper limit value of the third setting range, the output current signal theoretical value can be understood as the maximum output current signal value allowed by the calibrated pressure sensor under the pressure point value of the corresponding calibration point; the process column before adjustment corresponds to the current current signal output by the calibrated pressure sensor when the first real-time measured pressure is equal to or close to the corresponding pressure point value when the pressure calibration is performed at each calibration point (in determining the pressure and current signal ratio function of the pressure sensor In the case of a pressure drop calibration, the current measured pressure can be converted based on the current current signal); the return column before adjustment corresponds to the current current signal output by the calibrated pressure sensor when the second real-time measured pressure is equal to or close to the corresponding pressure point value during the pressure relief calibration process of each calibration point; the progress column after adjustment corresponds to the current current signal output by the calibrated pressure sensor when the first real-time measured pressure is equal to or close to the corresponding pressure point value during the pressure increase calibration process of each calibration point after the zero point and / or range of the calibrated pressure sensor is corrected; the return column after adjustment corresponds to the current current signal output by the calibrated pressure sensor when the first real-time measured pressure is equal to or close to the corresponding pressure point value during the pressure increase calibration process of each calibration point. After the zero point and / or range of the force sensor are corrected, when the second real-time measured pressure is equal to or close to the corresponding pressure point value during the pressure relief calibration at each calibration point, the current signal output by the calibrated pressure sensor; the maximum allowable value column corresponds to the theoretical value of the output current signal when the error value between the test pressure of the calibrated pressure sensor and its corresponding real-time measured pressure is exactly equal to the upper limit value of the third set range during the pressurization calibration or the pressure relief calibration at each calibration point, which can be understood as the maximum output current signal value allowed by the calibrated pressure sensor under the pressure point value of the corresponding calibration point.

[0073] like Figure 3 As shown, the present invention also provides a nuclear power plant pressure sensor automatic calibration system, including a metering sensor, a pressure control device and a control device. The control device 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 nuclear power plant pressure sensor automatic calibration method provided in the embodiment of the present invention are implemented.

[0074] In some embodiments, the metering sensor is an existing pressure sensor with a measurement accuracy of no more than 0.1%.

[0075] In some embodiments, the pressure control device is an existing electric pressing device.

[0076] In some embodiments, the processor is in communication with the metering sensor and the calibrated pressure sensor via the Hart communication protocol.

[0077] By implementing the technical solution of the present invention, the pressure sensor can be automatically calibrated and the calibration result can be automatically generated, which not only reduces the difficulty and cost of manual operation, but also has the advantage of high calibration accuracy.

[0078] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0079] 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 composition and steps of each example have been generally described in the above description according to function. 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 to be beyond the scope of the present invention.

[0080] The steps of the method or algorithm 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 a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0081] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A method for automatic calibration of a pressure sensor in a nuclear power plant, characterized in that: include: Acquire calibration parameters of the calibrated pressure sensor; wherein the calibration parameters include a calibration range and a number of calibration points; Determine the pressure point value corresponding to each check point according to the calibration range and the number of check points; Performing a pressurization calibration process in sequence based on each of the calibration points, the pressurization calibration process comprising: outputting a pressurization control signal according to the pressure point value of the calibration point to control a pressure control device to pressurize the calibrated pressure sensor and the metering sensor at the same time; obtaining a first real-time measured pressure of the metering sensor; determining whether the first real-time measured pressure is equal to or close to the pressure point value; when the first real-time measured pressure is equal to or close to the pressure point value, stopping outputting the pressurization control signal, and obtaining a current measured pressure of the calibrated pressure sensor, and determining the current measured pressure as the test pressure corresponding to the calibration point in the pressurization process; A calibration result is generated according to the test pressure of each of the calibration points.

2. The automatic calibration method for a nuclear power plant pressure sensor according to claim 1, characterized in that: The step of determining the pressure point value corresponding to each check point according to the calibration parameters comprises: The pressure point value corresponding to each calibration point is calculated using the following expression: Where p(1) represents the pressure point value corresponding to the first checkpoint, p(k) represents the pressure point value corresponding to the kth checkpoint, p(n) represents the pressure point value corresponding to the nth checkpoint, and R min Indicates the lower limit of the calibration range, R max represents the upper limit of the calibration range, and n represents the number of check points.

3. The automatic calibration method for a pressure sensor in a nuclear power plant according to claim 1, characterized in that: The pressurization calibration process further includes: Calculating a first pressure difference between the first real-time measured pressure and the pressure point value; Determining whether the first pressure difference is within a first set range; When the first pressure difference is within the first set range, the pressurization control signal is adjusted to control the pressurization rate of the pressure control device to decrease.

4. The automatic calibration method for a pressure sensor in a nuclear power plant according to claim 1, characterized in that: Also includes: Based on each of the check points, a pressure relief calibration process is performed in sequence, and the pressure relief calibration process includes: Output a pressure relief control signal according to the pressure point value of the calibration point to control the pressure control device to relieve pressure on the calibrated pressure sensor and the metering sensor at the same time; obtain a second real-time measured pressure of the metering sensor; determine whether the second real-time measured pressure is equal to or close to the pressure point value; when the second real-time measured pressure is equal to or close to the pressure point value, stop outputting the pressure relief control signal, obtain the current measured pressure of the calibrated pressure sensor, and determine the current measured pressure as the test pressure corresponding to the pressure point value during the pressure relief process.

5. The automatic calibration method for a pressure sensor in a nuclear power plant according to claim 4, characterized in that: The pressure relief calibration process further includes: Calculating a second pressure difference between the second real-time measured pressure and the pressure point value; determining whether the second pressure difference is within a second set range; When the second pressure difference is within the second set range, the pressure relief control signal is adjusted to control the pressure relief rate of the pressure control device to decrease.

6. The automatic calibration method for a nuclear power plant pressure sensor according to claim 4, characterized in that: Also includes: According to the magnitude of the pressure point value of each of the check points, the pressurization calibration process is performed in sequence from small to large; After the pressurization calibration process is completed at all the check points, the pressure relief calibration process is performed in sequence from large to small according to the pressure point values ​​of the check points.

7. The automatic calibration method for a nuclear power plant pressure sensor according to any one of claims 1 to 6, characterized in that: The step of generating a calibration result according to the test pressure of each pressure point value comprises: For each of the test pressures, the following steps are performed: calculating an error value between the test pressure and the corresponding real-time measured pressure; determining whether the error value is within a third set range; when the error value is within the third set range, determining that the test pressure meets the standard; when the error value is not within the third set range, determining that the test pressure does not meet the standard; If all the test pressures meet the standards, the calibrated pressure sensor is determined to be calibrated properly, and a corresponding calibration report is output; If at least one of the test pressures does not meet the standard, the calibrated pressure sensor is determined to be unqualified and a corresponding calibration report is output.

8. The automatic calibration method for a pressure sensor in a nuclear power plant according to claim 7, characterized in that: The third setting range is from -0.5% to 0.5%.

9. The automatic calibration method for a nuclear power plant pressure sensor according to claim 7, characterized in that: Also includes: When the calibrated pressure sensor is determined to be unqualified for calibration, the zero point and / or the range of the calibrated pressure sensor is corrected.

10. A nuclear power plant pressure sensor automatic calibration system, characterized in that: include: Metering sensors; Pressure control device; as well as A control device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the automatic calibration method for a pressure sensor in a nuclear power plant as claimed in any one of claims 1 to 9 are implemented.

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