A calculation method for the structural failure of a power transformer under high-energy faults and related equipment

Abstract

The present invention discloses a calculation method for the structural failure of a power transformer under high-energy faults and related equipment, belonging to the technical field of calculating the structural failure of a power transformer. First, a three-dimensional geometric model of the power transformer is built, and the three-dimensional geometric model of the power transformer includes a liquid domain model and a solid domain model. The liquid domain model and the solid domain model are meshed to obtain a meshed liquid domain model and a meshed solid domain model. Then, based on the meshed liquid domain model, the oil pressure load of the high-energy arc fault is calculated, and the structural strain of the meshed solid domain model is obtained based on the oil pressure load of the high-energy arc fault, simulating the state of the power transformer under the impact of the high-energy arc fault. The failure behavior of the power transformer is obtained based on the structural strain of the meshed solid domain model. Finally, the failure behavior of the power transformer is evaluated and analyzed, improving the accuracy of the structural response evaluation of the power transformer under high-energy arc faults.

Description

Technical Field

[0001] The invention belongs to the technical field of power transformer structure failure calculation, and specifically relates to a power transformer structure failure calculation method under high-energy faults and related equipment. Background Art

[0002] Oil-immersed power transformers are an important part of the power system. As a key hub for modern power generation, transmission, transformation, distribution and consumption, the operating conditions of various types of power transformers are directly related to the safety, reliability and economy of the entire power system. In recent years, there have been many internal high-energy arc faults at home and abroad that have caused large oil-immersed power transformers to spray and explode, causing huge economic losses and social impacts. When a high-energy arc fault occurs inside a large oil-filled device, the insulating oil evaporates and cracks rapidly under the action of the high-energy arc, producing a large amount of hydrocarbon mixed gas such as hydrogen and ethane, and forming rapidly expanding bubbles, resulting in a strong oil pressure load inside the oil tank. The high-pressure impact acts on the oil tank structure, eventually causing the tank to fail and rupture, accompanied by a large amount of insulating oil spraying out. The leaked material is ignited after contacting the outside world, eventually causing a fire.

[0003] With the development of modern computer technology, the simulation technology for the transient evolution of oil pressure surge under internal faults in power transformers has made progress. However, the existing research schemes do not effectively consider the coupling relationship between cavity failure behavior and fault oil pressure load, and the failure mechanism of the oil tank structure under the oil pressure load generated by internal faults remains to be revealed. As a prerequisite for studying transformer fault explosion-proof technology, the industry currently still lacks an accurate and effective numerical calculation method to accurately evaluate the structural response of power transformers under high-energy arc faults. Summary of the invention

[0004] The present invention provides a method for calculating the structural failure of a power transformer under a high-energy fault and related equipment, which solves the problem of inaccurate evaluation of the structural response of the power transformer under a high-energy arc fault.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for calculating structural failure of a power transformer under high-energy faults, comprising:

[0007] Building a three-dimensional geometric model of a power transformer, wherein the three-dimensional geometric model of the power transformer includes a liquid domain model and a solid domain model, and meshing the liquid domain model and the solid domain model to obtain a mesh liquid domain model and a mesh solid domain model;

[0008] Calculate the oil pressure load of high-energy arc fault based on the grid liquid domain model;

[0009] Obtaining the structural strain of the mesh solid domain model based on the oil pressure load of high-energy arc fault;

[0010] Obtain the failure behavior of a power transformer based on the structural strain of a grid solid domain model;

[0011] Evaluate and analyze the failure behavior of a power transformer.

[0012] Preferably, the liquid domain model adopts a turbulence model, and the transport equation of the turbulence model is:

[0013]

[0014]

[0015] where, is the fluid mixture density, is the fluid flow velocity, is the turbulent kinetic energy, is the energy dissipation rate, is the turbulent Prandtl number, is the fluid molecular viscosity, is the correction term, is the correction term of the turbulent kinetic energy, and are the turbulent viscosity constants, is the partial derivative symbol, is the time, is the vector differential operator.

[0016] Preferably, the steps for calculating the oil pressure load of a high-energy arc fault are specifically as follows:

[0017] Simulate the high-energy arc fault state, obtain the bubble dynamics equation of the grid liquid domain model under the arc fault according to the Navier-Stokes equation, then set the flow field solver of the grid liquid domain model, and solve the oil pressure load of the high-energy arc fault based on the bubble dynamics equation of the grid liquid domain model under the arc fault.

[0018] Preferably, the steps for obtaining the structural strain of the grid solid domain model based on the oil pressure load of the high-energy arc fault are specifically as follows:

[0019] Apply the oil pressure load of the high-energy arc fault to the grid solid domain model, then set the material properties, load boundary conditions, solution time, and calculation step size of the grid solid domain model to ensure the convergence of the calculation results, then add the material constitutive relationship of the grid solid domain model, and describe the structural strain of the grid solid domain model using the Johnson-Cook constitutive model based on the material constitutive relationship, load boundary conditions, solution time, and calculation step size of the grid solid domain model.

[0020] Preferably, the Johnson-Cook constitutive model is:

[0021]

[0022] Among them, , , , and are all experimental experience parameters, is the Cauchy stress tensor in the solid domain, is the equivalent plastic strain, is the equivalent strain rate, is the relative strain rate, is the relative temperature, The calculation formula is:

[0023]

[0024] Among them, is the reference temperature, is the material melting temperature, is the temperature.

[0025] Preferably, the steps to obtain the failure behavior of the power transformer based on the structural strain of the grid solid domain model are as follows:

[0026] Describe the explicit dynamic equation of the structural failure movement process of the power transformer based on the structural strain of the grid solid domain model, configure the solver, solution step size and solution time of the grid solid domain model, and calculate the failure behavior of the power transformer based on the explicit dynamic equation of the structural failure movement process of the power transformer.

[0027] Preferably, the explicit dynamic equation of the structural failure movement process of the power transformer is:

[0028]

[0029] Among them, is the Cauchy stress tensor in the solid domain, where i and j respectively represent two directions of the stress tensor, is the material density, is the unit mass body force component, is the displacement acceleration component.

[0030] A calculation system for the structural failure of a power transformer under high-energy faults, including:

[0031] Model establishment module: used to build a three-dimensional geometric model of the power transformer. The three-dimensional geometric model of the power transformer includes a liquid domain model and a solid domain model, and perform grid meshing on the liquid domain model and the solid domain model to obtain a grid liquid domain model and a grid solid domain model;

[0032] Calculation module: used to calculate the high-energy arc fault oil pressure load based on the grid liquid domain model;

[0033] Configuration module: used to obtain the structural strain of the grid solid domain model based on the high-energy arc fault oil pressure load;

[0034] Failure behavior acquisition module: used to obtain the failure behavior of the power transformer based on the structural strain of the grid solid domain model;

[0035] Evaluation and analysis module: used to evaluate and analyze the failure behavior of the power transformer.

[0036] A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of a method for calculating the structural failure of a power transformer under high-energy faults are implemented.

[0037] A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the steps of a method for calculating the structural failure of a power transformer under high-energy faults are implemented.

[0038] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for calculating the structural failure of a power transformer under high-energy faults. First, a three-dimensional geometric model of the power transformer is built, which includes a liquid domain model and a solid domain model. The liquid domain model and the solid domain model are meshed to obtain a grid liquid domain model and a grid solid domain model. Then, based on the grid liquid domain model, the high-energy arc fault oil pressure load is calculated, and based on the high-energy arc fault oil pressure load, the structural strain of the grid solid domain model is obtained, simulating the state of the power transformer under the impact of high-energy arc faults. Based on the structural strain of the grid solid domain model, the failure behavior of the power transformer is obtained. Finally, the failure behavior of the power transformer is evaluated and analyzed, improving the accuracy of the structural response evaluation of the power transformer under high-energy arc faults. Description of the Drawings

[0039] Figure 1 It is a finite element mesh model diagram of an oil-immersed transformer according to an embodiment of the present invention.

[0040] Figure 2 It is a flowchart of a method for calculating the structural failure of a power transformer under high-energy faults according to an embodiment of the present invention.

[0041] Figure 3The oil pressure distribution nephogram inside the fuel tank at different times after the fault occurs in the embodiment of the present invention, where a is at t = 5 ms, b is at t = 10 ms, c is at t = 20 ms, and d is at t = 52 ms.

[0042] Figure 4 The strain distribution nephogram of the fuel tank structure at different times after the fault occurs in the embodiment of the present invention, where a is at t = 5 ms, b is at t = 10 ms, c is at t = 20 ms, and d is at t = 52 ms.

[0043] Figure 5 The weld strain-time curve graph in the embodiment of the present invention.

[0044] Figure 6 The block diagram of the power transformer structure failure calculation system under high-energy faults in the embodiment of the present invention. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0048] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0049] As Figure 2 shown, the present invention provides a method for calculating the structural failure of a power transformer under high-energy faults based on explicit dynamics, including the following steps:

[0050] (1) Build a three-dimensional geometric model of the power transformer. The three-dimensional geometric model of the power transformer includes a liquid domain model and a solid domain model. Mesh the liquid domain model and the solid domain model to obtain a meshed liquid domain model and a meshed solid domain model;

[0051] (2) Calculate the oil pressure load of the high-energy arc fault based on the grid liquid domain model;

[0052] (3) Obtain the structural strain of the grid solid domain model based on the oil pressure load of the high-energy arc fault;

[0053] (4) Obtain the structural strain of the grid solid domain model based on the oil pressure load of the high-energy arc fault;

[0054] (5) Evaluate and analyze the failure behavior of the power transformer.

[0055] Further, the specific step (1) is: Build the liquid domain model and the solid domain model of the three-dimensional geometric model of the power transformer based on the Spaceclaim software;

[0056] Further, use the Meshing software to select the Octree Method function to build the three-dimensional geometric model of the power transformer, and perform grid meshing on the liquid domain model and the solid domain model to obtain the grid liquid domain model and the grid solid domain model. The grid solid domain model is divided into 359,612 grid elements and 124,323 nodes, as Figure 1 shown.

[0057] Further, the specific step (2) is:

[0058] Represent the grid liquid domain model using the turbulence model (Re-Normalization Group model, renormalization group turbulence model), and its transport equation is:

[0059] (1)

[0060] (2)

[0061] Among them, is the fluid mixture density, is the fluid flow velocity, is the turbulent kinetic energy, is the energy dissipation rate, is the turbulent Prandtl number, is the fluid molecular viscosity, is the turbulent kinetic energy correction term, is the correction term, and are the turbulent viscosity constants, is the partial derivative symbol, is the time, is the vector differential operator.

[0062] The specific expression is:

[0063] (3)

[0064] Among them, is the vortex scale, S is the strain rate tensor, is the relative vortex scale, with a value of 4.38, is the model constant, with a value of 0.012, is the turbulent viscosity constant, is the fluid mixture density, is the energy dissipation rate, is the turbulent kinetic energy.

[0065] Furthermore, to simulate the high-energy arc fault state, the high-energy arc fault oil pressure load is obtained through the bubble dynamics equation of the grid liquid domain model under the arc fault. The bubble dynamics equation of the grid liquid domain model under the arc fault is obtained based on the Navier-Stokes equation. The calculation formula of the Navier-Stokes equation is:

[0066] (4)

[0067] Among them, is the fluid velocity vector, is the fluid pressure, is the radial distance, is the fluid density, is the fluid dynamic viscosity, is the partial derivative symbol, is the time.

[0068] Considering the following relationship exists at the gas-liquid phase interface:

[0069] (5)

[0070] Among them, is the gas-liquid interface pressure, is the fluid viscous term, where μ is the fluid viscosity, is the surface tension term, is the specific heat ratio, and are the bubble volume and internal energy respectively, is the turbulent Prandtl number of insulating oil, is the bubble radius, is the radial velocity of the bubble surface.

[0071] Based on the first law of thermodynamics, the bubble dynamics equation is obtained as:

[0072] (6)

[0073] Among them, is the energy injected by the high-energy arc, is the dissipated energy, is the arc energy conversion coefficient, is the bubble radius, is the radial velocity of the bubble surface, is the radial acceleration of the bubble surface, is the fluid domain pressure, is the radial distance, is the specific heat ratio, Internal energy of the bubble, is the fluid density.

[0074] Furthermore, set the flow field solver of the grid liquid domain model as a transient solver to solve the high-energy arc fault oil pressure load.

[0075] Furthermore, the specific step (3) is as follows:

[0076] Import the grid solid domain model into the structural mechanics software;

[0077] Load the oil pressure load calculated in step (2) onto the grid solid domain model, specifically the inner wall of the fuel tank of the grid solid domain model.

[0078] Set the material properties, load boundary conditions, solution time, and calculation step size of the grid solid domain model to ensure the convergence of the calculation results;

[0079] Furthermore, add the material constitutive relation of the grid solid domain model, and use the Johnson-Cook constitutive model to describe the structural strain of the grid solid domain model. The Johnson-Cook constitutive model is:

[0080] (7)

[0081] Among them, , , , and are all experimental empirical parameters, is the Cauchy stress tensor of the solid domain, is the equivalent plastic strain, is the equivalent strain rate, is the relative strain rate, is the relative temperature, The calculation formula is:

[0082] (8)

[0083] Among them, is the reference temperature, is the melting temperature of the material, For temperature.

[0084] Furthermore, the step (4) is specifically as follows: describing the explicit dynamic equation of the power transformer structure failure motion process based on the structural strain of the grid solid domain model, and calculating the power transformer failure behavior based on the explicit dynamic equation of the power transformer structure failure motion process;

[0085] Furthermore, the explicit dynamic equation describing the failure motion process of the power transformer structure is as follows:

[0086] (9)

[0087] in, is the Cauchy stress tensor in the solid domain, where the subscript i and j represent the two directions of the stress tensor, is the material density, is the volume force per unit mass, is the displacement acceleration component.

[0088] Configure the solver, solution step size, and solution time for a meshed solid domain model to compute the failure behavior of a power transformer.

[0089] Furthermore, the step (5) is specifically as follows:

[0090] Based on the post-processing tools provided by the ANSYS Workbench simulation platform, the distribution and evolution of key parameters such as stress, strain, and displacement are observed to determine the weak points of the power transformer tank structure under high-energy arc faults.

[0091] Figure 3 The internal oil pressure distribution cloud diagram of a large oil-immersed power transformer under a high-energy arc fault is shown. It can be seen that 52 ms after the fault occurs, the oil pressure inside the tank rises sharply, and the local pressure peak can reach 2.5 MPa. Figure 4 The strain distribution cloud diagram of the power transformer oil tank structure is given, revealing the destructive effect of oil pressure shock on the transformer oil tank structure. The strain distribution gradually expands over time, and the maximum strain value appears at the bottom weld, which is also the location where tearing damage occurs first. Figure 5It details the change of strain at the weld with time. After the fault occurs, the strain increases rapidly and reaches a limit strain value of nearly 10% at 20 ms. Subsequently, the strain value tends to be stable. These simulation results indicate that the weld at the bottom of the fuel tank is the weak link of the fuel tank structure under internal high-energy arc faults. The fuel tank structure ruptures along the stress concentration direction within dozens of milliseconds, ultimately leading to the overall tearing failure of the wall surface. Through the comprehensive analysis of pressure, stress, and strain, this study effectively reveals the failure mechanism of power transformers under high-energy arc faults, providing technical support for the improvement of subsequent explosion-proof designs.

[0092] As Figure 6 shown, another embodiment of the present invention provides a calculation system for the structural failure of a power transformer under high-energy faults, including:

[0093] A model establishment module: used to build a three-dimensional geometric model of the power transformer. The three-dimensional geometric model of the power transformer includes a liquid domain model and a solid domain model, and perform mesh division on the liquid domain model and the solid domain model to obtain a meshed liquid domain model and a meshed solid domain model;

[0094] A calculation module: used to calculate the oil pressure load of high-energy arc faults based on the meshed liquid domain model;

[0095] A configuration module: used to obtain the structural strain of the meshed solid domain model based on the oil pressure load of high-energy arc faults;

[0096] A failure behavior acquisition module: used to obtain the failure behavior of the power transformer based on the structural strain of the meshed solid domain model;

[0097] An evaluation and analysis module: used to evaluate and analyze the failure behavior of the power transformer.

[0098] The terminal device provided by an embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in each of the above method embodiments. Or, when the processor executes the computer program, it implements the functions of each module / unit in each of the above device embodiments.

[0099] The computer program can be divided into one or more modules / units. The one or more modules / units are stored in the memory and executed by the processor to complete the present invention.

[0100] The terminal device can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory.

[0101] The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0102] The memory can be used to store the computer program and / or module. By running or executing the computer program and / or module stored in the memory, and by invoking the data stored in the memory, the processor realizes various functions of the terminal device.

[0103] If the modules / units integrated in the terminal device are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above method embodiments of the present invention, it can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above various method embodiments can be realized. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0104] Although the embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments and application fields. The above specific embodiments are merely illustrative and guiding, rather than restrictive. Under the inspiration of the specification, those of ordinary skill in the art can also make many forms without departing from the scope protected by the claims of the present invention, and all of these fall within the scope of protection of the present invention.

Claims

1. A calculation method for the structural failure of a power transformer under high-energy faults, characterized in that Including: Construct a three-dimensional geometric model of a power transformer. The three-dimensional geometric model of the power transformer includes a liquid domain model and a solid domain model. Mesh the liquid domain model and the solid domain model to obtain a meshed liquid domain model and a meshed solid domain model; Based on the meshed liquid domain model, calculate the oil pressure load of a high-energy arc fault; Obtain the structural strain of the meshed solid domain model based on the oil pressure load of the high-energy arc fault; Obtain the failure behavior of the power transformer based on the structural strain of the meshed solid domain model; Evaluate and analyze the failure behavior of the power transformer; Among them, the steps of obtaining the failure behavior of the power transformer based on the structural strain of the meshed solid domain model are specifically: Describe the explicit dynamic equation of the structural failure movement process of the power transformer based on the structural strain of the meshed solid domain model, configure the solver, solution step size and solution time of the meshed solid domain model, and calculate the failure behavior of the power transformer based on the explicit dynamic equation of the structural failure movement process of the power transformer; The explicit dynamic equation of the structural failure movement process of the power transformer is: wherein, is the Cauchy stress tensor of the solid domain, wherein i and j respectively represent two directions of the stress tensor, is the material density, is the body force component per unit mass, is the displacement acceleration component.

2. The method for calculating the structural failure of a power transformer under high-energy faults according to claim 1, wherein The liquid domain model adopts a turbulence model, and the transport equation of the turbulence model is as follows: wherein, is the fluid mixing density, is the fluid flow velocity, is the turbulent kinetic energy, is the energy dissipation rate, is the turbulent Prandtl number, is the fluid molecular viscosity, is the correction term, is the correction term of turbulent kinetic energy, and are the turbulent viscosity constants, is the partial derivative symbol, is the time, is the vector differential operator.

3. A calculation method for the structural failure of a power transformer under high-energy faults according to claim 1, characterized in that, The steps of calculating the oil pressure load of the high-energy arc fault are specifically: Simulate the high-energy arc fault state, obtain the bubble dynamic equation of the meshed liquid domain model under the arc fault according to the Navier-Stokes equation, then set the flow field solver of the meshed liquid domain model, and solve the oil pressure load of the high-energy arc fault based on the bubble dynamic equation of the meshed liquid domain model under the arc fault.

4. A calculation method for the structural failure of a power transformer under high-energy faults according to claim 1, characterized in that The steps of obtaining the structural strain of the meshed solid domain model based on the oil pressure load of the high-energy arc fault are specifically: Load the oil pressure load of the high-energy arc fault onto the meshed solid domain model, then set the material properties, load boundary conditions, solution time and calculation step size of the meshed solid domain model to ensure the convergence of the calculation results, and then add the material constitutive relationship of the meshed solid domain model. Based on the material constitutive relationship, load boundary conditions, solution time and calculation step size of the meshed solid domain model, use the Johnson-Cook constitutive model to describe the structural strain of the meshed solid domain model.

5. A method for calculating the structural failure of a power transformer under high-energy faults according to claim 4, characterized in that, The Johnson-Cook constitutive model is: Among them, , , , and are all experimental experience parameters, is the Cauchy stress tensor of the solid domain, is the equivalent plastic strain, is the equivalent strain rate, is the relative strain rate, is the relative temperature, The calculation formula is: Among them, is the reference temperature, is the material melting temperature, is the temperature.

6. A calculation system for the structural failure of a power transformer under high-energy faults, characterized in that, Including: Model establishment module: used to construct a three-dimensional geometric model of a power transformer. The three-dimensional geometric model of the power transformer includes a liquid domain model and a solid domain model. Mesh the liquid domain model and the solid domain model to obtain a meshed liquid domain model and a meshed solid domain model; Calculation module: used to calculate the oil pressure load of a high-energy arc fault based on the meshed liquid domain model; Configuration module: used to obtain the structural strain of the meshed solid domain model based on the oil pressure load of the high-energy arc fault; Failure behavior acquisition module: used to obtain the failure behavior of the power transformer based on the structural strain of the meshed solid domain model; Evaluation and analysis module: used to evaluate and analyze the failure behavior of the power transformer; Among them, the steps of obtaining the failure behavior of the power transformer based on the structural strain of the meshed solid domain model are specifically: The explicit dynamic equation that describes the structural failure motion process of a power transformer based on the grid solid domain model, configure the solver, solution step size, and solution time of the grid solid domain model, and calculate the failure behavior of the power transformer based on the explicit dynamic equation of the structural failure motion process of the power transformer; The explicit dynamic equation of the structural failure motion process of the power transformer is: Among them, is the Cauchy stress tensor in the solid domain, where i and j represent two directions of the stress tensor respectively, is the material density, is the body force component per unit mass, is the displacement acceleration component.

7. A computer 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, it implements the steps of a method for calculating the structural failure of a power transformer under high-energy faults as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of a method for calculating the structural failure of a power transformer under high-energy faults as described in any one of claims 1 to 5.

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