Nuclear power plant transformer oil level regulation method and device, computer equipment and medium

Abstract

The present application relates to the technical field of nuclear power plant operation optimization, and specifically discloses a nuclear power plant transformer oil level regulation method and device, computer equipment and medium, the method comprising: determining the theoretical oil level height value and the minimum oil level height value when the transformer is normally operating; when oil is injected into the transformer, the oil injection oil level height of the transformer is regulated according to the theoretical oil level height value and the minimum oil level height value. The present application can ensure that the oil level of the nuclear power plant transformer is maintained within a suitable range, thereby ensuring the normal, continuous and reliable operation of the transformer and equipment. Compared with the conventional oil level regulation method relying on manual experience judgment, the present application has lower regulation cost and higher reliability.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant operation optimization technology, and in particular to a method, device, computer equipment and medium for regulating the oil level of a nuclear power plant transformer. Background Technology

[0002] As crucial electrical equipment, nuclear power plant transformers are responsible for converting the unit's output power to a suitable voltage level for distribution to the power grid, or for supplying the grid's voltage to plant auxiliary equipment after voltage regulation. The transmission of electrical energy is achieved through transformer step-up or step-down. During normal operation, the transformer is filled with transformer oil for insulation and cooling. As the transformer temperature fluctuates, the volume of the insulating oil within the transformer changes accordingly, reflected in the oil level in the conservator located at the top of the transformer. When the transformer requires periodic oil draining maintenance or when damage during operation leads to insufficient oil levels, oil filling is necessary, which involves controlling the oil level.

[0003] In existing nuclear power plant transformers, the amount of oil to be added is usually determined based on past experience, referring to the oil level gauge on the oil conservator. However, relying on workers' experience to control the oil level is prone to errors in worker judgment or malfunctions in the oil level gauge, which can lead to significant deviations in the amount of oil added to the transformer. This can easily cause the transformer to malfunction and continue operating normally, and may even affect the reliable operation of the equipment.

[0004] It is evident that the existing method of controlling the oil level in transformers relies on the experience and judgment of workers. This not only requires dedicated personnel for management, resulting in high labor costs, but also makes it difficult to accurately control the amount of oil injected into the transformer due to errors in experience-based judgment, thus failing to ensure the normal, continuous, and reliable operation of the transformer and equipment. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, device, computer equipment, and storage medium for regulating the oil level of a nuclear power plant transformer in order to address the above-mentioned technical problems, thereby solving the problem that the existing transformer oil level control relies on the experience and judgment of workers, which results in high labor costs and low reliability.

[0006] A method for regulating the oil level of a nuclear power plant transformer includes:

[0007] Determine the theoretical oil level and minimum oil level during normal transformer operation;

[0008] When filling the transformer with oil, the oil level of the transformer is adjusted according to the theoretical oil level and the minimum oil level.

[0009] A transformer oil level control device for nuclear power plants, comprising:

[0010] The first determining module is used to determine the theoretical oil level and the minimum oil level during normal operation of the transformer.

[0011] The control module is used to adjust the oil level of the transformer according to the theoretical oil level and the minimum oil level when filling the transformer with oil.

[0012] A computer device includes a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, wherein the processor executes the computer-readable instructions to implement the above-described nuclear power plant transformer oil level control method.

[0013] One or more readable storage media storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the above-described nuclear power plant transformer oil level control method.

[0014] The aforementioned method, device, computer equipment, and storage medium for regulating the oil level of a nuclear power plant transformer ensures that the oil level remains within a suitable range during normal operation. This is achieved by first determining the theoretical and minimum oil level values ​​during normal transformer operation, and then adjusting the oil level during oil injection based on these values. This ensures the normal, continuous, and reliable operation of the transformer and related equipment. Furthermore, compared to traditional oil level regulation methods that rely on manual experience, this method offers lower costs and higher reliability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart illustrating a method for regulating the oil level of a nuclear power plant transformer according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the oil temperature-oil level curve provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the oil injection temperature-oil level gauge indication curve provided in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of a nuclear power plant transformer oil level control device according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of a computer device according to an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Existing experience-based transformer oil level control methods can be problematic. Excessive oil injection can lead to limited oil sump capacity during operation, causing internal pressure buildup and triggering the pressure relief valve, thus affecting equipment reliability. Conversely, insufficient oil injection results in continuous oil loss due to periodic sampling and component leakage, forcing the transformer to deviate from its intended operating range and requiring refilling during the next maintenance window. This invention proposes a method for regulating the oil level of nuclear power plant transformers. By theoretically calculating the theoretical and minimum oil level required for normal operation of an oil-immersed transformer, the method adjusts the oil level accordingly. This not only ensures the oil level remains within a suitable range, guaranteeing the normal, continuous, and reliable operation of the transformer and equipment, but also reduces the labor costs associated with regulation.

[0023] In one embodiment, such as Figure 1 As shown, a method for regulating the oil level of a nuclear power plant transformer is provided, comprising the following steps:

[0024] Step S10: Determine the theoretical oil level and minimum oil level during normal operation of the transformer.

[0025] As an example, step S10 above specifically includes the following steps:

[0026] Obtain the oil storage parameters of the transformer; wherein, the oil storage parameters include the oil conservator radius, oil conservator length, lower limit height of oil level in the oil conservator, upper limit height of oil level in the oil conservator, and the current weight of oil stored in the transformer;

[0027] Obtain the parameters of the oil injected into the transformer; wherein, the oil parameters include oil temperature, oil density, and expansion coefficient;

[0028] Based on the oil storage parameters and the oil parameters, the theoretical oil level height that should be injected into the transformer at the specified oil temperature is calculated.

[0029] Based on the theoretical oil level height and the preset oil loss value, the minimum oil level height when injecting oil into the transformer is calculated.

[0030] The oil injected into the transformer is generally insulating oil, such as KIX25 oil.

[0031] As an example, based on the oil storage parameters and the oil parameters, the theoretical oil level height that should be injected into the transformer at the specified oil temperature is calculated as follows:

[0032] The volume increment of the oil is calculated based on the current oil weight, oil density, expansion coefficient, and oil temperature.

[0033] Specifically, the volume increment V of the oil can be calculated according to the following formula (1). T0 .

[0034] V T0 =(Q / ρ)*q*(T-0) (1);

[0035] Where Q is the current weight of the oil stored in the transformer, which is the weight of the insulating oil in the transformer body, in tons; ρ is the oil density, 0.896 kg / L (KIX25 oil); q is the expansion coefficient, 0.0007 / ℃ (KIX25 oil); T is the oil temperature, based on the data indicated by the transformer body oil temperature gauge at the time of oil filling.

[0036] Based on the oil conservator radius, oil conservator length, and lower limit height of the oil level in the oil conservator, the oil volume corresponding to the lower limit height of the oil level in the oil conservator is calculated.

[0037] Specifically, the oil volume V2 corresponding to the lower limit height of the oil level in the oil conservator can be calculated according to the following formula (2).

[0038]

[0039] Where L is the length of the oil conservator, which is the internal length of the transformer's oil tank, in meters; D is the radius of the oil conservator, which is half the inner diameter of the transformer's oil tank, in meters; X is the lower limit height of the oil level in the oil conservator, which is the minimum oil level height allowed to ensure the reliable operation of the transformer during the operation of the oil tank, generally 0.10D; Π is pi, which is taken as 3.14 in the calculation.

[0040] The required amount of oil to be injected into the transformer is calculated based on the oil volume and the volume increment.

[0041] Specifically, the required oil injection quantity V of the transformer can be calculated according to the following formula (3). T .

[0042] V T=V2+V T0 (3);

[0043] Based on the required oil volume, oil tank radius, and oil tank length, the theoretical oil level height to be injected into the transformer is calculated.

[0044] Specifically, the theoretical oil level height h to be injected into the transformer can be calculated according to the following formula (4) or (5).

[0045] When h≤D, the theoretical oil level h to be injected into the transformer can be calculated according to the following formula (4):

[0046]

[0047] When h > D, the theoretical oil level h to be injected into the transformer can be calculated according to the following formula (5):

[0048]

[0049] In this embodiment of the invention, the oil level gauge is selected with a scale that is evenly distributed from 0 to 10, and the oil volume increases by the same amount between each scale. With the transformer out of service at a minimum ambient temperature of -25℃ and an oil temperature of 0℃, the oil level indication is based on the lower limit height X of the oil level in the oil conservator as the starting condition, corresponding to an oil level gauge scale of 0. The theoretical oil level height h when the transformer oil filling temperature is T can be calculated using the formulas (1) to (5) above.

[0050] In one embodiment, before obtaining the transformer's oil storage parameters, the method further includes:

[0051] Determine the effective volume of the transformer body expansion and the effective volume of the oil conservator buffer margin.

[0052] The effective expansion volume V0 of the transformer body can be determined according to the following steps:

[0053] During transformer operation, the highest and lowest average temperatures of the internal oil are collected; the temperature difference between the highest and lowest average temperatures is calculated. This temperature difference can be determined with reference to national standards for transformer oil. For example, according to GB 1094.1-1996, the average highest temperature of transformer oil is (40+60 / 2) = 70℃, and the lowest temperature is -25℃, thus the temperature difference K is calculated to be 95℃.

[0054] Based on the current oil weight Q, oil density ρ, expansion coefficient q, and temperature difference, the effective expansion volume V0 of the transformer body is calculated.

[0055] Specifically, the effective volume V0 of the transformer body expansion can be calculated according to the following formula (6).

[0056] V0=(Q / ρ)*q*K (6).

[0057] The lower limit height of the oil level in the oil conservator and the upper limit height of the oil level in the oil conservator are determined based on the effective volume of the expansion of the vessel body and the effective volume of the buffer margin of the oil conservator.

[0058] Among them, the effective volume V4 of the oil conservator buffer margin is related to the total volume V1 of the transformer oil conservator, the oil volume V2 corresponding to the lower limit height X of the oil level in the oil conservator, and the empty volume V3 of the oil conservator corresponding to the upper limit height S of the oil level in the oil conservator. Specifically, by combining the above formula (2) and the following formulas (7), (8), and (9), the effective volume V4 of the oil conservator buffer margin can be calculated.

[0059] V1=Π*D 2 *L (7);

[0060]

[0061] V4 = V1 - V2 - V3 (9).

[0062] Right now

[0063] In formula (2) above, X < D; in formula (8) above, S > D.

[0064] When the transformer is operating normally, V0 < V4. In this case, the lower limit height X and the upper limit height S of the oil level in the oil conservator can be determined according to the above formulas (2), (7), (8), and (9). When V0 > V4, it is necessary to redetermine the lower limit height X and the upper limit height S of the oil level in the oil conservator.

[0065] As an example, the calculation of the minimum oil level when injecting oil into the transformer based on the theoretical oil level and the preset oil loss value includes:

[0066] The oil inside the transformer is sampled and analyzed to obtain the oil consumption of the transformer, as well as the oil consumption due to component leakage during the operation of the transformer.

[0067] Based on the oil consumption, the oil consumption due to component leakage, and the amount of oil to be injected, the theoretical oil level is adjusted to obtain the minimum oil level when injecting oil into the transformer.

[0068] During the actual operation cycle of a transformer, the amount of oil consumed for normal operation is not only the amount of oil required, but also the amount of oil lost due to leakage and other reasons. Therefore, in order to maintain the normal and continuous operation of the transformer, it is necessary to take into account not only its normal oil consumption, but also the oil loss caused by other situations.

[0069] In this embodiment of the invention, the oil in the transformer is sampled and analyzed periodically during the actual operation cycle of the transformer. For example, the nuclear power plant operates in an 18-month refueling mode, and operates for 18 months in one cycle. The oil is sampled and analyzed once a month, and the oil consumption per cycle is 5L. Assuming that no oil injection or drainage operation is performed on the transformer for three refueling cycles, the oil consumption V5 of the transformer can be calculated according to the following formula (10):

[0070] V5 = 5 * 18 * 3 = 270 (L) (10).

[0071] Generally, a transformer body contains four or more large components such as radiators and oil pumps, more than 20 central components such as valves, as well as non-electrical protection devices, metering equipment, and numerous auxiliary components connected to the oil circuit. During operation, these components experience a certain amount of oil loss. This oil loss (i.e., the amount of oil consumed by component leakage) can be calculated by referring to the oil tank volume and applying a coefficient of 0.1. Specifically, the amount of oil consumed by component leakage V6 can be calculated according to the following formula (11).

[0072] V6 = 0.1 * V1 = 0.1 * Π * D 2 *L (11).

[0073] Based on the above oil consumption, component leakage oil consumption and required oil volume, the theoretical oil level height value is corrected to obtain the minimum oil level height value when injecting oil into the transformer. Specifically, the oil volume correction value V7 when the transformer oil temperature is T can be calculated according to the following formula (12).

[0074] V7 = V T +V5+V6=V2+V T0 +V5+V6 (12).

[0075] Substitution

[0076] When H≤D, the minimum oil level height H is calculated according to the following formula (13).

[0077]

[0078] Substituting formula (12) into formula (13), we get:

[0079]

[0080] By substituting the determined constants (including oil density, expansion coefficient, and pi) into the above formula (14), the minimum oil level height value H can be calculated.

[0081] When H > D, the minimum oil level height H is calculated according to the following formula (15).

[0082]

[0083] Substituting formula (12) into formula (15), we get:

[0084]

[0085] According to the above formulas (14) and (16), the minimum oil level height H of the oil tank when the transformer oil temperature is T can be calculated. In the actual oil filling process, this minimum oil level height H is the most intuitive control value. The corresponding oil temperature-oil level height curve is as follows: Figure 2 As shown in the figure. The oil level height is a proportionality coefficient to the internal diameter of the oil conservator.

[0086] Generally, transformers are equipped with pointer-type oil level gauges at the oil conservator. In this embodiment of the invention, it is assumed that the oil level gauge is used with a uniformly distributed scale from 0 to 10, and the oil volume increases by the same amount between each scale. A calculation curve (oil temperature - oil level gauge indication curve) is calculated based on the lowest oil level height H corresponding to oil temperature T at that time. Figure 3 As shown.

[0087] Step S20: When filling the transformer with oil, adjust the oil level of the transformer according to the theoretical oil level and the minimum oil level.

[0088] As an example, step S20 above includes the following steps:

[0089] Under vacuum conditions, oil is injected into the transformer, and the temperature of the oil inside the transformer is measured in real time.

[0090] When the oil level in the transformer reaches the preset height, the oil injection is stopped and the vacuum is broken. Then, the oil is injected into the transformer until the theoretical oil level is reached.

[0091] Once the temperature change of the oil in the transformer is within the preset range and the liquid level in the measuring pipeline remains unchanged, the theoretical oil level is finely adjusted to the minimum oil level to complete the oil filling operation.

[0092] When filling a transformer with oil, the actual oil level is crucial, as it affects the control of the oil filling rate and the duration of vacuum maintenance. In this embodiment of the invention, the oil level data is measured using a U-tube.

[0093] For example, when filling a transformer with oil, first fill the transformer with oil to half its body volume (i.e., the preset height), then lead out a transparent pipeline from the valve at the bottom of the transformer; next, hang this pipeline at the highest point of the oil tank and fix it; then, open the valve at the bottom of the pipeline and observe the rise of the oil level in the transparent pipeline during the oil filling process; temporarily stop oil filling when the oil level reaches the bottom of the oil tank and perform a vacuum breaking process on the transformer; after the vacuum breaking is completed, continue filling the transformer with oil to the theoretical oil level height h; then, after the change value of the transformer oil temperature is within the preset range and the liquid level in the measuring pipeline remains unchanged (i.e., the oil temperature and the liquid level in the measuring pipeline are both stable), slightly open the oil filling equipment for fine-tuning so that the transformer oil level is controlled at the minimum oil level height H; then check and confirm whether the oil level gauge reading is within the dial scale range. If it is, the oil filling operation is completed, the valve is closed and the measuring pipeline is removed.

[0094] During transformer operation, ambient temperature and load conditions affect the transformer's operating temperature, which in turn affects the volume of insulating oil within the transformer body. On one hand, the nuclear power plant transformer oil level control method provided in this invention, by combining parameters such as oil temperature during oil filling, upper and lower limits of the oil conservator height, calculating the volume change under maximum temperature variations within the transformer body, and the effective volume of the oil conservator's buffer margin, and by verifying and comparing the volume change and the effective volume of the oil conservator's buffer margin, can fundamentally eliminate abnormal oil filling caused by inappropriate oil conservator design data, thereby improving the operational reliability of the transformer and equipment.

[0095] On the other hand, during transformer oil filling operations, the real-time oil temperature directly affects the oil level after filling. However, traditional oil level control methods typically assume the oil temperature is a fixed value, ignoring the real-time influence of oil temperature on the filling oil level. This often leads to judgment errors and makes it difficult to accurately control the filling oil level within the appropriate range, thus hindering the normal and continuous operation of the transformer and equipment. The nuclear power plant transformer oil level control method proposed in this invention fully considers the influence of oil temperature on the filling oil level and provides the theoretical basis for calculating the theoretical and minimum oil level values ​​during the filling process. Compared to methods relying on manual experience, this method offers higher reliability.

[0096] Third, the present invention also fully considers the oil consumption and component leakage oil consumption during the transformer's operating cycle, and corrects the theoretical oil level height value of the oil to be injected into the transformer based on the oil consumption, component leakage oil consumption, and the amount of oil to be injected, so as to obtain the minimum oil level height value when injecting oil into the transformer. The oil level height of the transformer is adjusted according to this minimum oil level height value, which is more accurate and can effectively ensure that the nuclear power unit does not need additional oil injection operation within at least three operating cycles, thereby improving the transformer's operating efficiency.

[0097] In addition, combined with such Figure 2 The schematic curve of oil temperature-oil level shown is as follows: Figure 3 The oil temperature-oil level gauge indication curve shown can be used to verify the relationship between the two during oil injection. This not only improves the reliability of oil injection but also allows for the timely detection of deviations during the injection process, especially abnormal oil level gauge readings when the oil level data is normal. These deviations can then be addressed within this window.

[0098] In practical applications, the control method provided in this invention can extend the transformer maintenance and oil injection operation to three cycles or more during the oil injection process of nuclear power plant transformers. This shortens the overhaul period and reduces maintenance costs while ensuring the reliability of equipment operation, thus having broad market prospects.

[0099] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0100] In one embodiment, a nuclear power plant transformer oil level control device is provided, which corresponds one-to-one with the nuclear power plant transformer oil level control method described in the above embodiments. For example... Figure 4 As shown, the transformer oil level control device of this nuclear power plant includes a first determining module 11 and a control module 12. Detailed descriptions of each functional module are as follows:

[0101] The first determining module 11 is used to determine the theoretical oil level height value and the minimum oil level height value when the transformer is operating normally.

[0102] The control module 12 is used to control the oil level of the transformer according to the theoretical oil level and the minimum oil level when the transformer is filled with oil.

[0103] In one embodiment, the determining module includes:

[0104] An oil storage parameter acquisition unit is used to acquire the oil storage parameters of the transformer; wherein, the oil storage parameters include the oil conservator radius, oil conservator length, lower limit height of the oil level in the oil conservator, upper limit height of the oil level in the oil conservator, and the current weight of the oil stored in the transformer;

[0105] The oil parameter acquisition unit is used to acquire the oil parameters of the oil injected into the transformer; wherein, the oil parameters include oil temperature, oil density and expansion coefficient;

[0106] The theoretical oil level height calculation unit is used to calculate the theoretical oil level height value at which oil should be injected into the transformer at the specified oil temperature, based on the oil storage parameters and the oil parameters.

[0107] The minimum oil level height calculation unit is used to calculate the minimum oil level height when injecting oil into the transformer based on the theoretical oil level height value and the preset oil loss value.

[0108] In one embodiment, the theoretical oil level height calculation unit is specifically used for:

[0109] The volume increment of the oil is calculated based on the current oil weight, oil density, expansion coefficient, and oil temperature.

[0110] Based on the oil conservator radius, oil conservator length, and lower limit height of the oil level in the oil conservator, the oil volume corresponding to the lower limit height of the oil level in the oil conservator is calculated;

[0111] The required amount of oil to be injected into the transformer is calculated based on the oil volume and the volume increment.

[0112] Based on the required oil volume, oil tank radius, and oil tank length, the theoretical oil level height to be injected into the transformer is calculated.

[0113] In one embodiment, the nuclear power plant transformer oil level control device further includes:

[0114] The second determining module is used to determine the effective volume of the transformer body expansion and the effective volume of the oil conservator buffer margin.

[0115] The third determining module is used to determine the lower limit height of the oil level in the oil conservator and the upper limit height of the oil level in the oil conservator based on the effective volume of the expansion of the vessel body and the effective volume of the buffer margin of the oil conservator.

[0116] In one embodiment, the second determining module includes:

[0117] A temperature difference calculation unit is used to collect the highest and lowest average temperatures of the oil inside the transformer during operation; and to calculate the temperature difference between the highest and lowest average temperatures.

[0118] The volume calculation unit is used to calculate the effective expansion volume of the transformer body based on the current oil weight, oil density, expansion coefficient and temperature difference.

[0119] In one embodiment, the minimum oil level height calculation unit is specifically used for:

[0120] The oil inside the transformer is sampled and analyzed to obtain the oil consumption of the transformer, as well as the oil consumption due to component leakage during the operation of the transformer.

[0121] Based on the oil consumption, the oil consumption due to component leakage, and the amount of oil to be injected, the theoretical oil level is adjusted to obtain the minimum oil level when injecting oil into the transformer.

[0122] In one embodiment, the control module includes:

[0123] The first oil injection unit is used to inject oil into the transformer under vacuum conditions and to measure the oil temperature inside the transformer in real time.

[0124] The second oil injection unit is used to pause oil injection and perform vacuum breaking when the oil level in the transformer rises to a preset height, and then continue to inject oil into the transformer to the theoretical oil level.

[0125] The third oil injection unit is used to fine-tune the theoretical oil level to the minimum oil level after the oil temperature change in the transformer is within a preset range and the liquid level in the measuring pipeline remains unchanged, thereby completing the oil injection operation.

[0126] Specific limitations regarding the oil level control device for nuclear power plant transformers can be found in the limitations on the oil level control method for nuclear power plant transformers mentioned above, and will not be repeated here. Each module in the aforementioned nuclear power plant transformer oil level control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0127] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 5As shown, the computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes a readable storage medium and internal memory. The readable storage medium stores an operating system, computer-readable instructions, and a database. The internal memory provides an environment for the operation of the operating system and computer-readable instructions in the readable storage medium. The database stores data related to the nuclear power plant transformer oil level control method. The network interface communicates with external terminals via a network connection. When the computer-readable instructions are executed by the processor, they implement a nuclear power plant transformer oil level control method. The readable storage medium provided in this embodiment includes both non-volatile and volatile readable storage media.

[0128] In one embodiment, a computer device is provided, including a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, wherein the processor performs the following steps when executing the computer-readable instructions:

[0129] Determine the theoretical oil level and minimum oil level during normal transformer operation;

[0130] When filling the transformer with oil, the oil level of the transformer is adjusted according to the theoretical oil level and the minimum oil level.

[0131] In one embodiment, one or more computer-readable storage media storing computer-readable instructions are provided. The readable storage media provided in this embodiment include non-volatile readable storage media and volatile readable storage media. The readable storage media stores computer-readable instructions, which, when executed by one or more processors, perform the following steps:

[0132] Determine the theoretical oil level and minimum oil level during normal transformer operation;

[0133] When filling the transformer with oil, the oil level of the transformer is adjusted according to the theoretical oil level and the minimum oil level.

[0134] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing related hardware with computer-readable instructions. These computer-readable instructions can be stored in a non-volatile readable storage medium or a volatile readable storage medium. When executed, these computer-readable instructions can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0135] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0136] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method of regulating the oil level of a transformer in a nuclear power plant, characterized in that, The method comprises the following steps: obtaining oil storage parameters of the transformer; wherein the oil storage parameters comprise an oil pillow radius, an oil pillow length, and an oil pillow lower limit height, an oil pillow upper limit height, and a current oil weight stored in the transformer; obtaining oil parameters of the oil injected into the transformer; wherein the oil parameters comprise an oil temperature, an oil density, and an expansion coefficient; when the transformer is in operation, collecting a highest average temperature and a lowest average temperature of the oil inside the transformer; and calculating a temperature difference between the highest average temperature and the lowest average temperature; calculating, according to the current oil weight, the oil density, the expansion coefficient, and the temperature difference, an effective volume of a transformer body expansion of the transformer; determining, according to the oil pillow lower limit height, the oil pillow upper limit height, the oil pillow radius, and the oil pillow length, an effective volume of an oil pillow buffer margin of the transformer; if the effective volume of the transformer body expansion is greater than the effective volume of the oil pillow buffer margin, re-determining the oil pillow lower limit height and the oil pillow upper limit height until the effective volume of the transformer body expansion is less than the effective volume of the oil pillow buffer margin; calculating, according to the current oil weight, the oil density, the expansion coefficient, and the oil temperature, a volume increment of the oil; calculating, according to the oil pillow radius, the oil pillow length, and the oil pillow lower limit height, an oil volume corresponding to the oil pillow lower limit height; calculating, according to the oil volume and the volume increment, an oil amount to be injected into the transformer; calculating, according to the oil amount to be injected, the oil pillow radius, and the oil pillow length, a theoretical oil level height value of the oil to be injected into the transformer at the oil temperature; calculating, according to the theoretical oil level height value and a preset oil loss value, a minimum oil level height value when the oil is injected into the transformer; when the oil is injected into the transformer, adjusting an oil injection oil level height of the transformer according to the theoretical oil level height value and the minimum oil level height value.

2. The method of claim 1, wherein, The calculating, according to the theoretical oil level height value and a preset oil loss value, of the minimum oil level height value when the oil is injected into the transformer comprises: sampling and analyzing the oil in the transformer to obtain an oil consumption of the transformer and a component leakage oil consumption of the transformer during operation; correcting the theoretical oil level height value according to the oil consumption, the component leakage oil consumption, and the oil amount to be injected to obtain the minimum oil level height value when the oil is injected into the transformer.

3. The method of claim 1, wherein the step of determining the oil level of the transformer is performed by a level sensor. The adjusting, when the oil is injected into the transformer, of the oil injection oil level height of the transformer according to the theoretical oil level height value and the minimum oil level height value comprises: injecting the oil into the transformer under vacuum conditions and measuring the oil temperature in the transformer in real time; when the oil surface height of the oil in the transformer rises to a preset height, pausing the oil injection and performing vacuum breaking, and then continuing to inject the oil into the transformer to the theoretical oil level height value. After the oil temperature change value in the transformer is within a preset range and the liquid level of the measuring pipeline is unchanged, the theoretical oil level height value is fine-tuned to the minimum oil level height value, and the oil injection operation is completed.

4. A nuclear power plant transformer oil level regulating device, characterized by, Comprise: The first determination module is used for obtaining the oil storage parameters of the transformer; wherein the oil storage parameters comprise the oil pillow radius, the oil pillow length and the oil pillow lower limit height, the oil pillow upper limit height and the current oil weight stored in the transformer; and the oil liquid parameters of the oil injected into the transformer are obtained; wherein the oil liquid parameters comprise the oil liquid temperature, the oil liquid density and the expansion coefficient; The second determination module is used for collecting the highest average temperature and the lowest average temperature of the oil inside the transformer when the transformer is running; calculating the temperature difference between the highest average temperature and the lowest average temperature; calculating the body expansion effective volume of the transformer according to the current oil weight, the oil liquid density, the expansion coefficient and the temperature difference; and determining the oil pillow buffer margin effective volume according to the oil pillow lower limit height, the oil pillow upper limit height, the oil pillow radius and the oil pillow length; The third determination module is used for re-determining the oil pillow lower limit height and the oil pillow upper limit height if the body expansion effective volume of the transformer is greater than the oil pillow buffer margin effective volume, until the body expansion effective volume of the transformer is less than the oil pillow buffer margin effective volume. The first determination module is used for calculating the volume increment of the oil liquid according to the current oil weight, the oil liquid density, the expansion coefficient and the oil liquid temperature; calculating the oil volume corresponding to the oil pillow lower limit height according to the oil pillow radius, the oil pillow length and the oil pillow lower limit height; calculating the oil amount to be injected into the transformer according to the oil volume and the volume increment; calculating the theoretical oil level height value of the oil to be injected into the transformer at the oil liquid temperature according to the oil amount to be injected, the oil pillow radius and the oil pillow length; and calculating the minimum oil level height value when the oil is injected into the transformer according to the theoretical oil level height value and a preset oil loss value; The regulation and control module is used for regulating and controlling the oil injection level height of the transformer according to the theoretical oil level height value and the minimum oil level height value when the oil is injected into the transformer.

5. The nuclear power plant transformer oil level regulating device of claim 4, wherein, The first determination module is specifically used for: sampling and analyzing the oil in the transformer to obtain the oil consumption of the transformer and the component leakage oil consumption in the running process of the transformer; correcting the theoretical oil level height value according to the oil consumption, the component leakage oil consumption and the oil amount to be injected to obtain the minimum oil level height value when the oil is injected into the transformer. 6.A computer device, comprising a memory, a processor, and computer readable instructions stored in the memory and executable on the processor, wherein, The processor executes the computer readable instructions to implement the nuclear power plant transformer oil level regulation and control method in any one of claims 1 to 3.

7. One or more readable storage media storing computer readable instructions, wherein, The computer readable instructions are executed by one or more processors to enable the one or more processors to perform the nuclear power plant transformer oil level regulation and control method in any one of claims 1 to 3.

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