Nuclear power main transformer state monitoring method and device

Abstract

The invention provides a nuclear power main transformer state monitoring method and device. The method comprises the following steps: acquiring a digital model and a current working condition of the nuclear power main transformer; determining physical field distribution of the digital model according to the current working condition; according to the physical field distribution, the convective heat transfer coefficient of the winding of the nuclear power main transformer under the current working condition is determined; and determining temperature distribution information of the winding under the current working condition according to the convective heat transfer coefficient of the winding. The convective heat transfer coefficient is used for replacing coupling iterative calculation of a fluid field and a temperature field, the temperature distribution information of the winding can be rapidly calculated, and the specific condition of the temperature field in the nuclear power main transformer is displayed in real time.

Description

Technical Field

[0001] The present application belongs to the technical field of nuclear power plants, and in particular, relates to a method and device for monitoring the status of a nuclear power main transformer. Background Art

[0002] At present, finite element software is usually used to construct a digital geometric model of a nuclear power main transformer. Then, according to the physical environment and physical field characteristic parameters of the nuclear power main transformer, a multi-field coupling simulation model of the nuclear power main transformer is established. Finally, multi-field coupling calculations are performed based on the digital geometric model and the multi-field coupling simulation model to obtain the temperature field of the nuclear power main transformer.

[0003] However, due to the large overall size and multiple structures of the nuclear power main transformer, the calculation time is long when using finite element software for calculation, and it is impossible to display the temperature field distribution inside the transformer in time when the transformer load changes. Summary of the invention

[0004] The embodiments of the present application provide a method, device, electronic device, readable storage medium and computer program product for monitoring the status of a nuclear power main transformer, which can solve the problem of long time required for calculating temperature field distribution using finite element software.

[0005] In a first aspect, an embodiment of the present application provides a method for monitoring the state of a nuclear power main transformer, comprising:

[0006] Obtain the digital model and current operating conditions of the nuclear power main transformer;

[0007] Determining the physical field distribution of the digital model according to the current working condition;

[0008] Determining, according to the physical field distribution, a convection heat transfer coefficient of the winding of the nuclear power main transformer under the current operating condition;

[0009] Determining temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding;

[0010] The digital model of the nuclear power main transformer is determined according to the actual structure of the nuclear power main transformer.

[0011] In one embodiment, determining the physical field distribution of the digital model according to the current working condition includes:

[0012] Determining the electromagnetic field distribution of the digital model according to the electromagnetic condition of the nuclear power main transformer under the current working condition, and determining the loss of the winding according to the electromagnetic field distribution;

[0013] Determine the fluid field distribution and temperature field distribution of the digital model according to the loss of the winding under the current working condition, the oil flow rate and oil temperature at the inlet and outlet of the nuclear power main transformer;

[0014] Wherein, the physical field distribution includes the electromagnetic field distribution, the fluid field distribution and the temperature field distribution.

[0015] In one embodiment, determining the convection heat transfer coefficient of the winding of the nuclear power main transformer under the current working condition according to the physical field distribution includes:

[0016] Determining the convection heat transfer coefficient of the nodes of the winding according to the fluid field distribution and the temperature field distribution of the digital model;

[0017] Wherein, the digital model includes nodes of each structure after distributed grid division.

[0018] In one embodiment, determining the temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding includes:

[0019] Based on the node matrix of the digital model and the convection heat transfer coefficient of the winding, a convection heat transfer coefficient matrix is ​​generated;

[0020] Establishing a steady-state heat transfer equation for the winding according to the convection heat transfer coefficient matrix;

[0021] Calculating the steady-state heat transfer equation of the winding to obtain temperature distribution information of the winding;

[0022] The node matrix of the digital model is generated according to the node, unit and boundary node information of each structure of the digital model.

[0023] In one embodiment, establishing the steady-state heat transfer equation of the winding according to the convection heat transfer coefficient matrix includes:

[0024] According to the convection heat transfer coefficient matrix, steady-state heat transfer equations of internal nodes, boundary nodes and vertex nodes are established;

[0025] Calculating the steady-state heat transfer equation of the winding to obtain temperature distribution information of the winding includes:

[0026] Simultaneously solving the steady-state heat transfer equations of the internal nodes, the boundary nodes and the vertex nodes to obtain temperature values ​​of the internal nodes, the boundary nodes and the vertex nodes;

[0027] generating temperature distribution information of the winding according to the temperature values ​​of the internal nodes, the boundary nodes and the vertex nodes;

[0028] The nodes of the winding include the internal nodes, the boundary nodes and the vertex nodes.

[0029] In one embodiment, after determining the temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding, the method further includes:

[0030] The temperature distribution information of the winding under the historical working conditions is displayed in chronological order.

[0031] In a second aspect, an embodiment of the present application provides a nuclear power main transformer state monitoring device, comprising:

[0032] An acquisition module is used to obtain the digital model and current working condition of the nuclear power main transformer;

[0033] A monitoring module, used to determine the physical field distribution of the digital model according to the current working condition;

[0034] It is also used to determine the convection heat transfer coefficient of the winding of the nuclear power main transformer under the current working condition according to the physical field distribution;

[0035] It is also used to determine the temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding;

[0036] The digital model of the nuclear power main transformer is determined according to the actual structure of the nuclear power main transformer.

[0037] In one embodiment, the apparatus further comprises:

[0038] The display module is used to display the temperature distribution information of the winding under historical working conditions in chronological order.

[0039] In a third aspect, an embodiment of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements a method as described in any one of the above-mentioned first aspects when executing the computer program.

[0040] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method as described in any one of the above-mentioned first aspects is implemented.

[0041] In a fifth aspect, an embodiment of the present application provides a computer program product. When the computer program product is run on an electronic device, the electronic device executes any one of the methods described in the first aspect.

[0042] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0043] The embodiment of the present application obtains the digital model of the nuclear power main transformer and the current operating condition; determines the physical field distribution of the digital model according to the current operating condition; determines the convective heat transfer coefficient of the winding of the nuclear power main transformer under the current operating condition according to the physical field distribution; determines the temperature distribution information of the winding under the current operating condition according to the convective heat transfer coefficient of the winding, and replaces the convective heat transfer coefficient with the coupled iterative calculation of the fluid field and the temperature field, so as to quickly calculate the temperature distribution information of the winding and realize real-time display of the specific situation of the temperature field inside the nuclear power main transformer.

[0044] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 This is a first flow chart of a method for monitoring the state of a nuclear power main transformer provided in an embodiment of the present application;

[0047] Figure 2 is an example diagram of a nuclear power transformer provided by an embodiment of the present application;

[0048] Figure 3 is an example diagram of fluid field distribution provided by an embodiment of the present application;

[0049] Figure 4 is an example diagram of temperature field distribution provided by an embodiment of the present application;

[0050] Figure 5 is an example diagram of a digital model after distributed grid division provided by an embodiment of the present application;

[0051] Figure 6 is an example diagram of a node matrix of a wire cake provided in an embodiment of the present application;

[0052] Figure 7 is an example diagram of temperature distribution information provided by an embodiment of the present application;

[0053] Figure 8 This is an example diagram of the temperature field distribution calculated by the finite element software;

[0054] Fig. 9 This is a second flow chart of a method for monitoring the status of a nuclear power main transformer provided in an embodiment of the present application;

[0055] Fig.10 It is a structural schematic diagram of a nuclear power main transformer state monitoring device provided in one embodiment of the present application;

[0056] Fig.11 It is a schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0057] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0058] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0059] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0060] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0061] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0062] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0063] In one embodiment, Figure 1 This is a schematic diagram of the first flow chart of the method for monitoring the status of a nuclear power main transformer provided in an embodiment of the present application. Figure 1 As shown, the method comprises:

[0064] S11: Obtain the digital model and current operating conditions of the nuclear power main transformer.

[0065] Among them, the digital model of the nuclear power main transformer is determined according to the actual structure of the nuclear power main transformer.

[0066] In the application, the finite element software is used to obtain the real mechanical structure of the nuclear power main transformer, build the geometric model of the nuclear power main transformer, and obtain the digital model. Among them, the finite element software can be COMSO simulation software (advanced numerical simulation software). The real mechanical structure includes geometric dimensions, material properties, etc.

[0067] The current operating conditions include the current operating status and conditions of the nuclear power main transformer, including load current, power factor, voltage fluctuation range, oil temperature conditions, coolant flow rate, pressure, flow, etc.

[0068] S12: Determine the physical field distribution of the digital model according to the current working conditions.

[0069] The physical field distribution includes electromagnetic field distribution, fluid field distribution and temperature field distribution. The physical field distribution can be displayed through a distribution cloud map.

[0070] In the application, step S12 includes:

[0071] S121: Determine the electromagnetic field distribution of the digital model according to the electromagnetic conditions of the nuclear power main transformer under the current operating conditions, and determine the loss of the winding according to the electromagnetic field distribution.

[0072] In the application, the finite element software is used to determine the electromagnetic field distribution of the digital model according to the initial and boundary conditions of the electromagnetic in the current working condition. Then, based on the electromagnetic field distribution, the loss in the electromagnetic field winding is calculated.

[0073] Among them, electromagnetic includes the voltage and current of the winding, etc.

[0074] S122: Determine the fluid field distribution and temperature field distribution of the digital model according to the loss of the winding under the current working condition, the oil flow rate and oil temperature at the inlet and outlet of the nuclear power main transformer.

[0075] In the application, the loss of the winding is used as the heat source of the temperature field. Finite cloud software is used to calculate the fluid field and temperature field distribution of the digital model through steady-state coupling calculation of the fluid field and temperature field based on the loss of the winding, the oil flow rate and the oil temperature at the inlet and outlet under the current working conditions as the initial conditions.

[0076] For example, Figure 2 is an example diagram of a nuclear power transformer provided by an embodiment of the present application. Figure 2 As shown, the winding of the nuclear power main transformer includes 9 coils, the coil material is copper, the other areas of the nuclear power main transformer are oil domains, the material of the oil domain of the nuclear power main transformer is transformer oil, wherein the oil inlet is the lower boundary of the oil domain in the nuclear power main transformer, and the oil flow rate and oil temperature of the oil inlet are used as initial boundary conditions.

[0077] According to the loss of the winding, the oil flow rate and the oil temperature at the oil inlet under the current working conditions, coupling calculation is performed to obtain the fluid field distribution and temperature field distribution of the digital model. Figure 3 is an example diagram of the fluid field distribution provided by an embodiment of the present application. The flow rate of the transformer oil around the 9 coils is as follows: Figure 3 shown. Figure 4 is an example diagram of the temperature field distribution provided by an embodiment of the present application. The temperature of the 9 coils is as follows Figure 4 shown.

[0078] S13: Determine the convection heat transfer coefficient of the winding of the nuclear power main transformer under the current operating condition according to the physical field distribution.

[0079] In the application, step S13 includes:

[0080] According to the fluid field distribution and temperature field distribution of the digital model, the convection heat transfer coefficient of the nodes of the winding is determined.

[0081] The digital model includes nodes of each structure after distributed grid division.

[0082] In the application, after constructing the digital model of the nuclear power main transformer, the finite element software is used to perform distributed mesh division on the digital model, and then the digital model includes the node, unit, and boundary node information of each structure to better determine the convective heat transfer coefficient.

[0083] Finite element software is used to determine the fluid information and temperature information of each mesh node in the digital model based on the fluid field distribution and temperature field distribution of the digital model. The temperature and heat flux density of the winding nodes are extracted from the fluid information and temperature information of each mesh node in the digital model. According to the temperature and heat flux density of the winding nodes, the corresponding convection heat transfer coefficient is calculated.

[0084] For example, Figure 5 is an example diagram of a digital model after distributed grid division provided by an embodiment of the present application. Figure 5 As shown, the winding and the oil domain are divided into quadrilateral grids, the quadrilaterals represent units, the points on the quadrilaterals are nodes, and the nodes carry the fluid information of the fluid field distribution at the node and the temperature information of the temperature field distribution at the node.

[0085] S14: Determine the temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding.

[0086] In the application, step S14 includes:

[0087] S141: Based on the node matrix of the digital model and the convection heat transfer coefficient of the winding, a convection heat transfer coefficient matrix is ​​generated.

[0088] The node matrix of the digital model is generated according to the node, unit and boundary node information of each structure of the digital model.

[0089] In the application, Matlab software (commercial mathematical software) is used to extract the node, unit, and boundary node information of each structure of the nuclear power main transformer from the finite element software, and the node matrix of the corresponding distributed grid is generated according to the node, unit, and boundary node information of each structure to obtain the node matrix of the digital model. The node matrix of the digital model includes the node matrix of each structure.

[0090] For example, Figure 6 FIG. 1 is an example diagram of a node matrix of a coil provided in an embodiment of the present application. The node matrix of one coil of the winding includes 44 nodes, and the node numbers of the node matrix are as follows: Figure 6 shown.

[0091] Correspondingly, according to Figure 6 The convection heat transfer coefficient matrix determined by the node matrix of the wire cake is shown in Table 1:

[0092]

[0093]

[0094] S142: Based on the convection heat transfer coefficient matrix, a steady-state heat transfer equation for the winding is established.

[0095] In the application, the nodes of the winding include internal nodes, boundary nodes and vertex nodes. Boundary nodes are nodes located on the actual physical boundary between the winding and the oil domain, and the boundary nodes are in contact with other areas (such as the oil domain). Vertex nodes are nodes at the vertices of the winding. Internal nodes are nodes inside the winding and relatively close to the boundary area.

[0096] Correspondingly, step S142 includes

[0097] According to the convection heat transfer coefficient matrix, the steady-state heat transfer equations of internal nodes, boundary nodes and vertex nodes are established.

[0098] In the application, MATLAB software is used to establish the steady-state heat transfer equation of each node based on the solid heat transfer theory and the convection heat transfer coefficient matrix as the boundary condition.

[0099] Specifically, when scanning the nodes of the winding, when an internal node is obtained, the steady-state heat transfer equation of the internal node is established according to the heat transfer coefficient of the internal node in the convection heat transfer coefficient matrix. When a boundary node is obtained, the steady-state heat transfer equation of the boundary node is established according to the heat transfer coefficient of the boundary node in the convection heat transfer coefficient matrix. When a vertex node is obtained, the steady-state heat transfer equation of the vertex node is established according to the heat transfer coefficient of the vertex node in the convection heat transfer coefficient matrix.

[0100] The steady-state heat transfer equation for the internal nodes is:

[0101]

[0102] Where k is the heat transfer coefficient of the winding, T m,n+1 is the temperature of node number m,n+1, T m,n-1 is the temperature of node number m,n-1, T m+1,n is the temperature of the node numbered m+1,n, T m-1,n is the temperature of the node numbered m-1,n, T m,n is the temperature of the node numbered m, n, is the heat flux of the heat source, △x and △y are the node distances in the x and y directions respectively.

[0103] The steady-state heat transfer equation at the boundary node is:

[0104]

[0105] Where h is the convective heat transfer coefficient of transformer oil and winding.

[0106] The steady-state heat transfer equation of the vertex node is:

[0107]

[0108] S143: Calculate the steady-state heat transfer equation of the winding to obtain the temperature distribution information of the winding.

[0109] In application, S143, including:

[0110] S21: Simultaneously solve the steady-state heat transfer equations of the internal nodes, boundary nodes and vertex nodes to obtain the temperature values ​​of the internal nodes, boundary nodes and vertex nodes.

[0111] In the application, the steady-state heat transfer equations of the internal nodes, boundary nodes and vertex nodes are combined using MATLAB software to obtain the steady-state heat transfer equations. The steady-state heat transfer equations are solved to calculate the temperature value of each node.

[0112] S22: Generate temperature distribution information of the winding according to the temperature values ​​of the internal nodes, boundary nodes and vertex nodes.

[0113] In the application, Matlab software is used to perform interpolation fitting processing according to the temperature values ​​of internal nodes, boundary nodes and vertex nodes to generate the temperature distribution information of the winding.

[0114] For example, Figure 7 is an example diagram of temperature distribution information provided by an embodiment of the present application. Figure 7 The temperature distribution information shown in the figure is based on the method described in this embodiment. Figure 3 The fluid field distribution and Figure 4 The temperature field distribution shown is obtained by solving. Figure 8 This is an example of the temperature field distribution calculated by the finite element software. Figure 8 As shown in the figure, the temperature field distribution shown in the figure is based on the finite element software Figure 3 The fluid field distribution and Figure 4 The temperature field distribution shown is obtained by solving.

[0115] Please continue to refer to Figure 7 and Figure 8 The results of the solution obtained by the method described in this embodiment and the results of the solution obtained by the finite element software are compared and analyzed. The maximum temperature of the winding solved by the finite element software is 319K, and the maximum temperature of the winding solved by the method described in this embodiment is 318.5113K, and the calculation accuracy is 99.85%. The time required for the solution by the finite element software is 5s, and the time required for the solution by the method described in this embodiment is 0.97s, and the calculation time is improved by 80.6%.

[0116] It can be understood that taking the convective heat transfer coefficient as the result of the fluid-heat coupling calculation and combining it with the nodes of the winding can reduce the number of fluid-heat coupling calculation iterations, simplify the fluid-heat coupling calculation, and can quickly and efficiently calculate the temperature distribution information of the winding.

[0117] And because the convection heat transfer coefficient is determined based on the actual flow and heat field of the nuclear power main transformer, the accuracy of the temperature distribution information of the winding is guaranteed, and the internal state of the nuclear power transformer can be accurately monitored and evaluated. The comprehensiveness of the monitoring status can be improved, providing a basis for improving the accuracy of fault diagnosis results, and improving the equipment management level and intelligent operation and maintenance level of the nuclear power main transformer.

[0118] This embodiment obtains the digital model of the nuclear power main transformer and the current operating conditions; determines the physical field distribution of the digital model according to the current operating conditions; determines the convective heat transfer coefficient of the winding of the nuclear power main transformer under the current operating conditions according to the physical field distribution; determines the temperature distribution information of the winding under the current operating conditions according to the convective heat transfer coefficient of the winding, and replaces the convective heat transfer coefficient with the coupled iterative calculation of the fluid field and the temperature field, so as to quickly calculate the temperature distribution information of the winding and realize real-time display of the specific situation of the temperature field inside the nuclear power main transformer.

[0119] In one embodiment, Fig. 9 This is a second flow chart of a method for monitoring the status of a nuclear power main transformer provided in an embodiment of the present application. Fig. 9 As shown, after step S14, the following steps are also included:

[0120] S15: Display the temperature distribution information of the winding under the historical working conditions in chronological order.

[0121] In the application, the operating data of the nuclear power main transformer can be accumulated, and the temperature distribution information of the winding under historical operating conditions can be displayed in chronological order to show the operating trend of the nuclear power transformer in real time.

[0122] This embodiment displays the temperature distribution information of the windings under historical operating conditions in chronological order to show the operating trend of the nuclear power transformer in real time, provide data support for operation and maintenance personnel to evaluate the equipment status, provide a basis for timely discovery of latent faults, and provide tool support for equipment management.

[0123] It should be understood that the order of execution of the steps in the above embodiments does not mean the order of execution, and 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 application. In addition, the data collection in the above embodiments is compliant, and its use or implementation does not involve any infringement on the public interest.

[0124] Corresponding to the method described in the above embodiment, for the sake of convenience of explanation, only the part related to the embodiment of the present application is shown.

[0125] In one embodiment, Fig.10 Schematic diagram of the structure of a nuclear power main transformer status monitoring device provided by an embodiment of the present application. Fig.10 As shown, the device comprises:

[0126] The acquisition module 10 is used to obtain the digital model and current operating conditions of the nuclear power main transformer.

[0127] The monitoring module 11 is used to determine the physical field distribution of the digital model according to the current working conditions;

[0128] It is also used to determine the convection heat transfer coefficient of the winding of the nuclear power main transformer under the current working condition according to the physical field distribution;

[0129] It is also used to determine the temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding;

[0130] Among them, the digital model of the nuclear power main transformer is determined based on the actual structural information of the nuclear power main transformer.

[0131] In one embodiment, the monitoring module is specifically used to determine the electromagnetic field distribution of the digital model according to the electromagnetic conditions of the nuclear power main transformer under the current operating conditions, and determine the loss of the winding according to the electromagnetic field distribution; determine the fluid field distribution and temperature field distribution of the digital model according to the loss of the winding under the current operating conditions, the oil flow rate and oil temperature at the inlet and outlet of the nuclear power main transformer; wherein the physical field distribution includes electromagnetic field distribution, fluid field distribution and temperature field distribution.

[0132] In one embodiment, the monitoring module is specifically used to determine the convection heat transfer coefficient of the nodes of the winding according to the fluid field distribution and the temperature field distribution of the digital model; wherein the digital model includes nodes of each structure after distributed grid division.

[0133] In one embodiment, the monitoring module is specifically used to generate a convective heat transfer coefficient matrix based on the node matrix of the digital model and the convective heat transfer coefficient of the winding; establish the steady-state heat transfer equation of the winding based on the convective heat transfer coefficient matrix; calculate the steady-state heat transfer equation of the winding to obtain the temperature distribution information of the winding; wherein the node matrix of the digital model is generated based on the node, unit, and boundary node information of each structure of the digital model.

[0134] In one embodiment, the monitoring module is specifically used to establish steady-state heat transfer equations for internal nodes, boundary nodes and vertex nodes based on the convection heat transfer coefficient matrix; jointly and solve the steady-state heat transfer equations for the internal nodes, boundary nodes and vertex nodes to obtain temperature values ​​of the internal nodes, boundary nodes and vertex nodes; and generate temperature distribution information of the winding based on the temperature values ​​of the internal nodes, boundary nodes and vertex nodes; wherein the nodes of the winding include internal nodes, boundary nodes and vertex nodes.

[0135] In one embodiment, the device further comprises:

[0136] The display module is used to display the temperature distribution information of the winding under historical working conditions in chronological order.

[0137] Fig.11 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Fig.11 As shown, the electronic device 2 of this embodiment includes: at least one processor 20 ( Fig.11 Only one is shown in the figure), a memory 21, and a computer program 22 stored in the memory 21 and executable on the at least one processor 20, wherein the processor 20 implements the steps of any of the above-mentioned method embodiments when executing the computer program 22.

[0138] The electronic device 2 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The electronic device 2 may include, but is not limited to, a processor 20 and a memory 21. Those skilled in the art will appreciate that Fig.11 It is only an example of the electronic device 2 and does not constitute a limitation on the electronic device 2. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it may also include input and output devices, network access devices, etc.

[0139] The processor 20 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0140] In some embodiments, the memory 21 may be an internal storage unit of the electronic device 2, such as a hard disk or memory of the electronic device 2. In other embodiments, the memory 21 may also be an external storage device of the electronic device 2, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 2. Further, the memory 21 may also include both an internal storage unit of the electronic device 2 and an external storage device. The memory 21 is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of the computer program. The memory 21 may also be used to temporarily store data that has been output or is to be output.

[0141] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0142] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by 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. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0143] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0144] An embodiment of the present application provides a computer program product. When the computer program product runs on an electronic device, the electronic device can implement the steps in the above-mentioned method embodiments when executing the computer program product.

[0145] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device that can carry the computer program code to the camera / terminal device, a recording medium, a computer memory, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), an electric carrier signal, a telecommunication signal, and a software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some cases, the computer-readable medium cannot be an electric carrier signal and a telecommunication signal.

[0146] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0147] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can 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 this application.

[0148] In the embodiments provided in the present application, it should be understood that the disclosed devices / network equipment and methods can be implemented in other ways. For example, the device / network equipment embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0149] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0150] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for monitoring the state of a nuclear power main transformer, characterized in that: include: Obtain the digital model and current operating conditions of the nuclear power main transformer; Determining the physical field distribution of the digital model according to the current working condition; Determining, according to the physical field distribution, a convection heat transfer coefficient of the winding of the nuclear power main transformer under the current operating condition; Determining temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding; The digital model of the nuclear power main transformer is determined according to the actual structure of the nuclear power main transformer.

2. The method according to claim 1, characterized in that Determining the physical field distribution of the digital model according to the current working condition includes: Determining the electromagnetic field distribution of the digital model according to the electromagnetic condition of the nuclear power main transformer under the current working condition, and determining the loss of the winding according to the electromagnetic field distribution; Determine the fluid field distribution and temperature field distribution of the digital model according to the loss of the winding under the current working condition, the oil flow rate and oil temperature at the inlet and outlet of the nuclear power main transformer; Wherein, the physical field distribution includes the electromagnetic field distribution, the fluid field distribution and the temperature field distribution.

3. The method according to claim 2, characterized in that Determining the convection heat transfer coefficient of the winding of the nuclear power main transformer under the current working condition according to the physical field distribution includes: Determining the convection heat transfer coefficient of the nodes of the winding according to the fluid field distribution and the temperature field distribution of the digital model; Wherein, the digital model includes nodes of each structure after distributed grid division.

4. The method according to claim 3, characterized in that Determining the temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding includes: Based on the node matrix of the digital model and the convection heat transfer coefficient of the winding, a convection heat transfer coefficient matrix is ​​generated; Establishing a steady-state heat transfer equation for the winding according to the convection heat transfer coefficient matrix; Calculating the steady-state heat transfer equation of the winding to obtain temperature distribution information of the winding; The node matrix of the digital model is generated according to the node, unit and boundary node information of each structure of the digital model.

5. The method according to claim 4, characterized in that The step of establishing the steady-state heat transfer equation of the winding according to the convection heat transfer coefficient matrix comprises: According to the convection heat transfer coefficient matrix, steady-state heat transfer equations of internal nodes, boundary nodes and vertex nodes are established; The step of calculating the steady-state heat transfer equation of the winding to obtain the temperature distribution information of the winding includes: Simultaneously solving the steady-state heat transfer equations of the internal nodes, the boundary nodes and the vertex nodes to obtain temperature values ​​of the internal nodes, the boundary nodes and the vertex nodes; generating temperature distribution information of the winding according to the temperature values ​​of the internal nodes, the boundary nodes and the vertex nodes; The nodes of the winding include the internal nodes, the boundary nodes and the vertex nodes.

6. The method according to claim 5, characterized in that After determining the temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding, the method further includes: The temperature distribution information of the winding under the historical working conditions is displayed in chronological order.

7. A nuclear power main transformer status monitoring device, characterized in that: include: An acquisition module is used to obtain the digital model and current working condition of the nuclear power main transformer; A monitoring module, used to determine the physical field distribution of the digital model according to the current working condition; It is also used to determine the convection heat transfer coefficient of the winding of the nuclear power main transformer under the current working condition according to the physical field distribution; It is also used to determine the temperature distribution information of the winding under the current working condition according to the convection heat transfer coefficient of the winding; The digital model of the nuclear power main transformer is determined according to the actual structure of the nuclear power main transformer.

8. The device according to claim 7, characterized in that Also includes: The display module is used to display the temperature distribution information of the winding under historical working conditions in chronological order.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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