Transformer physical state calculation method and device, storage medium and program product

Abstract

The invention discloses a transformer physical state calculation method and device, a storage medium and a program product, and relates to the technical field of power equipment monitoring. The method comprises the following steps: constructing an electromagnetic field model of a tested transformer based on a structure measurement result of the tested transformer; coupling the solid structure and the electromagnetic field of the measured transformer, and solving the electromagnetic field model by using the measured Lorentz force of the transformer box body to obtain the non-diffusion current density of each space point in the transformer box body; based on the non-diffusion current density, Joule thermal power of a coil of the tested transformer is calculated, and the coil temperature of the tested transformer is calculated based on the Joule thermal power of the coil of the tested transformer; and based on the non-diffusion current density, calculating the Joule thermal power of the transformer box body, and based on the Joule thermal power of the transformer box body, calculating the temperature of the transformer box body. According to the invention, general, sustainable and accurate detection of the operating temperature of the transformer is realized.

Description

Technical Field

[0001] This invention relates to the field of power equipment monitoring technology, specifically to a method, device, storage medium, and program product for calculating the physical state of a transformer. Background Technology

[0002] As a core component of the power system, the stability and reliability of transformers' operation are crucial to the safety of the entire power grid. A transformer failure can lead not only to widespread power outages but also to severe economic losses and social impacts. Therefore, real-time and accurate condition monitoring and health assessment of transformers are key to achieving predictive maintenance in smart grids. Transformer condition monitoring methods are becoming increasingly diversified, gradually forming a multi-dimensional sensing system covering electrical, chemical, and physical aspects.

[0003] When a transformer is in operation, it is affected by various factors, which will manifest in temperature changes. Both the oil temperature and the coil temperature will affect the temperature of the tank. Summary of the Invention

[0004] This invention provides a method, device, storage medium, and program product for calculating the physical state of a transformer, enabling universal and sustainable accurate detection of transformer operating temperature.

[0005] The present invention is achieved through the following technical solution.

[0006] Firstly, a method for calculating the physical state of a transformer is provided, the method comprising:

[0007] Based on the structural measurement results of the transformer under test, an electromagnetic field model of the transformer under test is constructed. The structural measurement results include: the transformer multi-connection conduction region and the surrounding external insulation region, and the boundary of the transformer multi-connection conduction region is located at the edge of the transformer tank.

[0008] The solid structure and electromagnetic field of the transformer under test are coupled together, and the electromagnetic field model is solved using the measured Lorentz force of the transformer tank to obtain the non-diffusion current density at each spatial point in the transformer tank.

[0009] Based on the non-diffusion current density, the Joule thermal power of the coil of the transformer under test is calculated, and the coil temperature of the transformer under test is calculated based on the Joule thermal power of the coil of the transformer under test.

[0010] Based on the non-diffusion current density, the Joule thermal power of the transformer housing is calculated, and based on the Joule thermal power of the transformer housing, the temperature of the transformer housing is calculated.

[0011] In some embodiments, based on the structural measurement results of the transformer under test, an electromagnetic field model of the transformer under test is constructed, including:

[0012] Obtain the structural measurement results of the transformer under test, and set it in the surrounding external insulation region. =0 and ,in, Indicates electrical conductivity. Indicates magnetic permeability, This represents the magnetic permeability of the surrounding external insulator region;

[0013] Based on the structural measurement results of the transformer under test, a non-diffusion current density calculation model is constructed:

[0014] ;

[0015] in, Represents vector potential; Represents scalar potential; , representing the Hamiltonian; Represents an electric field; Indicates the non-diffusion current density; Indicates the time step;

[0016] Projecting the diffusionless current density calculation model onto the Nedelec-type basis functions, we obtain:

[0017] ;

[0018] in, , , Represents the finite element matrix. express Projection onto Nedelec-type basis functions; express Projection onto Nedelec-type basis functions.

[0019] In some embodiments, coupling the solid structure and electromagnetic field of the transformer under test includes:

[0020] After a preset time has elapsed since the structural measurements of the transformer under test were completed, and once the electromagnetic field of the transformer under test has stabilized, the electromagnetic field model is solved.

[0021] In some embodiments, the electromagnetic field model is solved using the measured Lorentz force of the transformer tank to obtain the non-diffusion current density at each spatial point within the transformer tank, including:

[0022] The diffusionless current density can be calculated using the following formula, based on the measured Lorentz force:

[0023] ;

[0024] in, This represents the measured Lorentz force; Indicates the non-diffusion current density; It represents the intensity of magnetic induction.

[0025] In some embodiments, calculating the Joule thermal power of the coil of the transformer under test based on the diffusionless current density, and calculating the coil temperature of the transformer under test based on the Joule thermal power of the coil, includes:

[0026] Based on the non-diffusion current density, the average Joule thermal power of the full eddy current with a predetermined step size within a predetermined time period is calculated, and based on the average Joule thermal power, the coil temperature of the transformer under test is calculated.

[0027] In some embodiments, calculating the Joule thermal power of the transformer housing based on the diffusionless current density, and calculating the temperature of the transformer housing based on the Joule thermal power of the transformer housing, includes:

[0028] Based on the non-diffusion current density, the Joule thermal power of the transformer tank area element is calculated, and based on the Joule thermal power of the transformer tank area element, the temperature of the transformer tank is calculated using a heat transfer model.

[0029] Secondly, a transformer physical state calculation device is provided, the device comprising:

[0030] The electromagnetic field model establishment module for the transformer under test is used to: construct the electromagnetic field model of the transformer under test based on the structural measurement results of the transformer under test, wherein the structural measurement results include: the transformer multi-connection conduction region and the surrounding external insulation region, and the boundary of the transformer multi-connection conduction region is located at the edge of the transformer tank;

[0031] The electromagnetic field model solving module for the transformer under test is used to: couple the solid structure and electromagnetic field of the transformer under test, and solve the electromagnetic field model using the measured Lorentz force of the transformer box to obtain the non-diffusion current density at each spatial point in the transformer box.

[0032] The transformer coil temperature calculation module is used to: calculate the Joule thermal power of the transformer coil based on the non-diffusion current density, and calculate the coil temperature of the transformer based on the Joule thermal power of the transformer coil.

[0033] The transformer enclosure temperature calculation module is used to: calculate the Joule thermal power of the transformer enclosure based on the non-diffusion current density, and calculate the temperature of the transformer enclosure based on the Joule thermal power of the transformer enclosure.

[0034] Thirdly, a transformer physical state calculation device is provided, the device comprising:

[0035] At least one processor; and

[0036] At least one memory is coupled to the at least one processor and stores instructions for execution by the at least one processor, which, when executed by the at least one processor, implement the method described above.

[0037] Fourthly, a computer-readable storage medium is provided, the computer-readable storage medium storing instructions that, when executed by a computer, cause the computer to perform the methods described above.

[0038] Fifthly, a computer program product is provided, the computer program product including instructions, which, when executed by a computer, cause the computer to perform the methods described above.

[0039] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0040] (A) A new numerical calculation method for calculating the temperature of a transformer tank is proposed, which can be used to transform the temperature problem of the tank into an electromagnetic field problem;

[0041] (B) A new data conversion and calculation method is proposed to calculate the accurate tank temperature by measuring the relevant stress parameters of the transformer.

[0042] (C) Based on the fundamental principles of electromagnetic fields, equations relating electromagnetic fields to forces and to heat transfer were designed. By solving these equations under specific conditions, the coil temperature and enclosure temperature of the transformer were determined. Numerical calculation methods were employed, using approximations for the electromagnetic field calculation parameters. These approximations utilized an artificial intelligence approximator algorithm, resulting in more accurate numerical calculations that closely approximate reality. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is a flowchart of a method for calculating the physical state of a transformer according to an embodiment of the present invention.

[0045] Figure 2 This is a flowchart illustrating the calculation of transformer coil and enclosure temperature according to an embodiment of the present invention.

[0046] Figure 3 This is a schematic diagram of an isotropic heat transfer model according to an embodiment of the present invention.

[0047] Figure 4 This is a structural block diagram of a transformer physical state calculation device according to an embodiment of the present invention.

[0048] Figure 5 This is a schematic diagram of the structure of a transformer physical state calculation device according to an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are only for explaining this invention and are not intended to limit this invention.

[0050] On the one hand, this invention proposes a method for calculating the physical state (temperature) of a transformer using electromagnetic induction heating, which provides a new approach to the normal operation detection of transformers. It uses eddy currents in the electromagnetic field to calculate the induction heating temperature of the transformer coil and the tank, thereby enabling continuous detection of temperature changes in the transformer.

[0051] Figure 1 This is a flowchart illustrating a method for calculating the physical state of a transformer according to an embodiment of the present invention. (Reference) Figure 1 The method for calculating the physical state of the transformer includes S10 to S40.

[0052] Figure 2 This is a flowchart illustrating the calculation of transformer coil and enclosure temperature according to an embodiment of the present invention. The following references... Figure 1 and Figure 2 The transformer physical state calculation method of the present invention will be described in detail.

[0053] In S10, an electromagnetic field model of the transformer under test is constructed based on the structural measurement results of the transformer under test. The structural measurement results include the transformer multi-connection conduction region and the surrounding external insulation region, and the boundary of the transformer multi-connection conduction region is located at the edge of the transformer tank.

[0054] For example, the electromagnetic field model of the transformer under test is constructed by following the steps A1 to A3.

[0055] A1: Let This is the multi-connection conduction area of ​​the transformer, and the surrounding external insulation area is... . and The interface between them is , Transformer boundary Let n be the boundary value at the edge of the transformer housing. The external normal vector, conductivity, permeability and permittivity are respectively represented by... To indicate. In In the middle, there is =0 and .

[0056] A2: Under the settings of A1, use To represent a vector potential, use Represents scalar potential, with the condition Hamiltonian as an example. The diffusionless current density calculation model can be obtained as follows:

[0057] ;

[0058] in, Represents an electric field; Indicates the non-diffusion current density; Indicates the time step.

[0059] A3: Projecting the formula in A2 onto the Nedelec-type basis functions, we obtain the system of linear equations:

[0060] ;

[0061] in, , , Represents the finite element matrix. express Projection onto Nedelec-type basis functions; express The projection onto the Nedelec-type basis functions. Solving this system of linear equations yields the diffusionless current density.

[0062] In S20, the solid structure and electromagnetic field of the transformer under test are coupled, and the electromagnetic field model is solved using the measured Lorentz force of the transformer tank to obtain the non-diffusion current density at each spatial point inside the transformer tank.

[0063] For example, the electromagnetic field model can be solved by the following description.

[0064] B1: After constructing the electromagnetic field model using A1 to A3, the Lorentz force calculation formula is used at each spatial point within the transformer enclosure:

[0065] ;

[0066] By measuring the Lorentz force in the transformer enclosure and solving the above linear equations, the non-diffusion current density at each spatial point inside the transformer enclosure can be calculated.

[0067] B2: Additionally, the fixed structure and electromagnetic field calculations of a transformer typically have their own time steps. Generally, the time step of the structural module is only one-tenth of the electromagnetic field time step. Therefore, the electromagnetic field parameters are updated only after a certain period of time following the completion of structural measurements, allowing for structural deformation. That is, after a preset time following the completion of structural measurements of the transformer under test, and after the electromagnetic field of the transformer under test has stabilized, the electromagnetic field model is solved.

[0068] In step S30, the Joule thermal power of the transformer under test coil is calculated based on the non-diffusion current density, and the coil temperature of the transformer under test is calculated based on the Joule thermal power of the transformer under test coil. Specifically, based on the non-diffusion current density, the average Joule thermal power of the total eddy current with a predetermined step size within a predetermined time period is solved, and the coil temperature of the transformer under test is calculated based on the average Joule thermal power.

[0069] For example, the coil temperature of the transformer under test is calculated by the following description.

[0070] C1: Induction heating is the process by which the transformer coil heats and conducts electricity. It is accomplished by the Joule heating generated by the eddy currents in the electromagnetic field induced during resistive operation. Because the eddy current frequency obtained from the electromagnetic field calculation described above is relatively small, while the current frequency in the induction heating of the coil is usually relatively large, taking several seconds, the eddy current solution calculated by the electromagnetic field cannot be directly used.

[0071] C2: Therefore, in this invention, the full eddy current problem is solved with a very small time step within a certain time period. The calculated Joule thermal power is averaged over this time period. In the next time period, there is no need to perform electromagnetic field calculations. Instead, the average value of the previously calculated Joule thermal power is directly assigned to the heat transfer calculation module. Then, the heat transfer calculation module integrates the average value of the Joule thermal power to obtain the electromagnetic induction heat (temperature) of the coil.

[0072] In S40, the Joule heat power of the transformer tank is calculated based on the non-diffusion current density, and the temperature of the transformer tank is calculated based on the Joule heat power of the transformer tank. Specifically, the Joule heat power for the transformer tank is calculated based on the non-diffusion current density, and the temperature of the transformer tank is calculated using a heat transfer model based on the Joule heat power of the transformer tank.

[0073] For example, the temperature of the transformer tank under test is calculated by the following description.

[0074] D1: The temperature conduction of the transformer tank is slower than the heat transfer of the coils, resulting in a slow current field (from one millimeter to one second). In this case, induced heat transfer can be neglected at the boundary, while the diffusion and induction of the electromagnetic field can be considered an infinitely fast process. Therefore, equation A2... =0, only scalar potential is retained. ,when When the value is 0, the Lorentz force is also zero, so only the Joule heat needs to be measured. .

[0075] D2: The Joule heat power calculated in D1 is added to the existing heat transfer model, which updates the temperature using its own time step. The heat transfer model uses an isotropic model with phase change for calculation. The heat transfer model used is as follows: Figure 3 As shown.

[0076] S30 and S40 are two steps that are executed in parallel, so they can be interchanged or executed simultaneously.

[0077] Compared with the prior art, the advantages of the present invention are as follows:

[0078] (A) A new numerical calculation method for calculating the temperature of a transformer tank is proposed, which can be used to transform the temperature problem of the tank into an electromagnetic field problem.

[0079] (B) A new data conversion and calculation method is proposed to calculate the accurate tank temperature by measuring the relevant stress parameters of the transformer.

[0080] (C) Based on the fundamental principles of electromagnetic fields, equations relating electromagnetic fields to forces and to heat transfer were designed. By solving these equations under specific conditions, the coil temperature and enclosure temperature of the transformer were determined. Numerical calculation methods were employed, using approximations for the electromagnetic field calculation parameters. These approximations utilized an artificial intelligence approximator algorithm, resulting in more accurate numerical calculations that closely approximate reality.

[0081] On the other hand, the present invention provides a transformer physical state calculation device. Figure 4 This is a structural block diagram of a transformer physical state calculation device according to an embodiment of the present invention. (Reference) Figure 4The device includes: a module for establishing the electromagnetic field model of the transformer under test, a module for solving the electromagnetic field model of the transformer under test, a module for calculating the coil temperature of the transformer under test, and a module for calculating the tank temperature of the transformer under test.

[0082] The module for establishing the electromagnetic field model of the transformer under test is used to: construct the electromagnetic field model of the transformer under test based on the structural measurement results of the transformer under test. The structural measurement results include: the multi-connection conduction region of the transformer and the surrounding external insulation region, and the boundary of the multi-connection conduction region of the transformer is located at the edge of the transformer tank.

[0083] The module for solving the electromagnetic field model of the transformer under test is used to couple the solid structure and electromagnetic field of the transformer under test, and solve the electromagnetic field model using the measured Lorentz force of the transformer tank to obtain the non-diffusion current density at each spatial point inside the transformer tank.

[0084] The module for calculating the coil temperature of the transformer under test is used to: calculate the Joule thermal power of the coil of the transformer under test based on the non-diffusion current density, and calculate the coil temperature of the transformer under test based on the Joule thermal power of the coil of the transformer under test.

[0085] The transformer enclosure temperature calculation module is used to: calculate the Joule thermal power of the transformer enclosure based on the non-diffusion current density, and calculate the temperature of the transformer enclosure based on the Joule thermal power of the transformer enclosure.

[0086] In some embodiments, based on the structural measurement results of the transformer under test, an electromagnetic field model of the transformer under test is constructed, including: acquiring the structural measurement results of the transformer under test and setting it within the surrounding external insulating region. =0 and ,in, Indicates electrical conductivity. Indicates magnetic permeability, This represents the permeability of the surrounding external insulating region; based on the structural measurement results of the transformer under test, a diffusionless current density calculation model is constructed:

[0087] ;

[0088] in, Represents vector potential; Represents scalar potential; , representing the Hamiltonian; Represents an electric field; Indicates the non-diffusion current density; Indicates the time step; projecting the diffusionless current density calculation model onto the Nedelec-type basis functions, we obtain:

[0089] ;

[0090] in, , , Represents the finite element matrix. express Projection onto Nedelec-type basis functions; express Projection onto Nedelec-type basis functions.

[0091] In some embodiments, coupling the solid structure and electromagnetic field of the transformer under test includes: solving the electromagnetic field model after a preset time has elapsed since the structural measurement of the transformer under test was completed and the electromagnetic field of the transformer under test has stabilized.

[0092] In some embodiments, the electromagnetic field model is solved using the measured Lorentz force of the transformer tank to obtain the non-diffusion current density at each spatial point within the transformer tank, including: using the following formula to solve for the non-diffusion current density using the measured Lorentz force:

[0093] ;

[0094] in, This represents the measured Lorentz force; Indicates the non-diffusion current density; It represents the intensity of magnetic induction.

[0095] In some embodiments, calculating the Joule thermal power of the coil of the transformer under test based on the non-diffusion current density, and calculating the coil temperature of the transformer under test based on the Joule thermal power of the coil of the transformer under test, includes: solving for the average Joule thermal power of the full eddy current with a predetermined step size within a predetermined time period based on the non-diffusion current density, and calculating the coil temperature of the transformer under test based on the average Joule thermal power.

[0096] In some embodiments, calculating the Joule thermal power of the transformer housing based on the non-diffusion current density and calculating the temperature of the transformer housing based on the Joule thermal power of the transformer housing includes: calculating the Joule thermal power for an area element of the transformer housing based on the non-diffusion current density, and calculating the temperature of the transformer housing using a heat transfer model based on the Joule thermal power for an area element of the transformer housing.

[0097] In implementing the functions of the integrated modules described above in hardware, this embodiment of the invention provides a structure for the transformer physical state calculation device involved in the above embodiments. Figure 5 This is a schematic diagram of a transformer physical state calculation device according to an embodiment of the present invention. (Reference) Figure 5The transformer physical state calculation device includes: at least one processor; and at least one memory. The at least one memory is coupled to the at least one processor and stores instructions for execution by the at least one processor, which, when executed by the at least one processor, implement the method described above.

[0098] A processor can be a set of logic blocks, modules, and circuits that implement or execute the various exemplary logic blocks, modules, and circuits described in connection with embodiments of the present invention. The processor can be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in connection with embodiments of the present invention. A processor can also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, etc.

[0099] The memory may be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, electrically erasable programmable read-only memory (EEPROM), disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

[0100] In one implementation, the memory can exist independently of the processor. The memory can be connected to the processor via a bus and used to store instructions or program code. When the processor calls and executes the instructions or program code stored in the memory, it can implement the methods provided in the embodiments of the present invention. In another implementation, the memory can also be integrated with the processor.

[0101] On the other hand, the present invention also provides a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium) storing computer program instructions that, when executed on a computer, cause the computer to perform the method as described in any of the above embodiments.

[0102] Exemplary examples show that the aforementioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (e.g., compact disks (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROMs), cards, sticks, or key drives, etc.). The various computer-readable storage media described in this invention may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0103] This invention provides a computer program that, when run on a computer, causes the computer to perform the method of any of the above embodiments.

[0104] This invention provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the method of any of the above embodiments.

[0105] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of calculating a physical state of a transformer, characterized by, The method comprises: Based on the structural measurement results of the measured transformer, an electromagnetic field model of the measured transformer is constructed, wherein the structural measurement results comprise a transformer multi-connection conduction region and a surrounding external insulator region, and a boundary of the transformer multi-connection conduction region is located at an edge of a transformer tank; The solid structure and the electromagnetic field of the measured transformer are coupled, and the electromagnetic field model is solved by using the measured Lorentz force of the transformer tank to obtain the non-diffusion current density of each space point in the transformer tank; Based on the non-diffusion current density, the Joule heat power of the coil of the measured transformer is calculated, and the coil temperature of the measured transformer is calculated based on the Joule heat power of the coil of the measured transformer; Based on the non-diffusion current density, the Joule heat power of the transformer tank is calculated, and the temperature of the transformer tank is calculated based on the Joule heat power of the transformer tank.

2. The method of claim 1, wherein, Based on the structural measurement results of the measured transformer, an electromagnetic field model of the measured transformer is constructed, comprising: acquiring a structural measurement result of the measured transformer, and setting in the surrounding external insulator region, = 0 and wherein, denotes the electric conductivity, denotes the magnetic permeability, denotes the magnetic permeability of the surrounding external insulator region; Based on the structural measurement results of the measured transformer, a non-diffusion current density calculation model is constructed: ； wherein, represents the vector potential; represents the scalar potential; , represents the Hamiltonian; represents the electric field; represents the diffusion-free current density; represents the time step; The non-diffusion current density calculation model is projected on a Nedelec-type basis function to obtain: ； wherein , , denotes the finite element matrix, denotes the projection onto Nedelec-type basis functions; denotes the projection onto Nedelec-type basis functions.

3. The method of claim 1, wherein, The solid structure and the electromagnetic field of the measured transformer are coupled, comprising: After a preset time after the structural measurement of the measured transformer is completed, the electromagnetic field model is solved after the electromagnetic field of the measured transformer is stable.

4. The method of claim 1, wherein, The non-diffusion current density of each space point in the transformer tank is obtained by solving the electromagnetic field model by using the measured Lorentz force of the transformer tank, comprising: The non-diffusion current density is solved by using the measured Lorentz force by using the following formula: ； wherein, represents the measured Lorentz force; represents the diffusion-free current density; represents the magnetic induction.

5. The method according to any one of claims 1 to 4, characterized in that, Based on the non-diffusion current density, the Joule heat power of the coil of the measured transformer is calculated, and the coil temperature of the measured transformer is calculated based on the Joule heat power of the coil of the measured transformer, comprising: Based on the non-diffusion current density, the average value of the Joule heat power of the full eddy current in a predetermined time period and a predetermined step length in the predetermined time period is solved, and the coil temperature of the measured transformer is calculated based on the average value of the Joule heat power.

6. The method according to any one of claims 1 to 4, characterized in that, Based on the non-diffusion current density, the Joule heat power of the transformer tank is calculated, and the temperature of the transformer tank is calculated based on the Joule heat power of the transformer tank, comprising: Based on the non-diffusion current density, the Joule heat power of the area element of the transformer tank is calculated, and the temperature of the transformer tank is calculated by using a heat transfer model based on the Joule heat power of the area element of the transformer tank.

7. A transformer physical state calculation device, characterized by, The device comprises: A measured transformer electromagnetic field model establishing module is configured to construct an electromagnetic field model of the measured transformer based on structural measurement results of the measured transformer, wherein the structural measurement results comprise a transformer multi-connection conduction region and a surrounding external insulator region, and a boundary of the transformer multi-connection conduction region is located at an edge of a transformer tank; The measured transformer electromagnetic field model solving module is configured to: couple a solid structure and an electromagnetic field of the measured transformer, and solve the electromagnetic field model by using the measured Lorentz force of the transformer tank to obtain a non-diffusion current density of each spatial point in the transformer tank; The measured transformer coil temperature calculation module is configured to: calculate a joule heat power of a coil of the measured transformer based on the non-diffusion current density, and calculate a coil temperature of the measured transformer based on the joule heat power of the coil of the measured transformer; The measured transformer tank temperature calculation module is configured to: calculate a joule heat power of the transformer tank based on the non-diffusion current density, and calculate a temperature of the transformer tank based on the joule heat power of the transformer tank.

8. A transformer physical state calculation device, characterized by, The device comprises: at least one processor; and at least one memory coupled to the at least one processor and storing instructions for execution by the at least one processor, the instructions, when executed by the at least one processor, implementing the method of any one of claims 1 to 6.

9. A computer readable storage medium characterized by, The computer-readable storage medium stores instructions, which, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 6.

10. A computer program product, characterised in that, The computer program product comprises instructions, which, when executed by a computer, cause the computer to perform the method according to any one of claims 1 to 6.

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