Electromagnetic transient analysis method, device and equipment for single-core armored cable, storage medium and program product

Abstract

The invention relates to an electromagnetic transient analysis method, an electromagnetic transient analysis device, electromagnetic transient analysis equipment, a storage medium and a program product for a single-core armored cable, and the method comprises the steps: obtaining impedance information of the unit length of the single-core armored cable and target evaluation parameters corresponding to the single-core armored cable; and inputting the impedance information per unit length of the single-core armored cable and the target evaluation parameter into a preset analysis model to carry out electromagnetic transient analysis on the single-core armored cable, thereby obtaining an analysis result. Wherein the target evaluation parameters comprise region parameters of the target region and all grid parameters in the target region, and the preset analysis model is constructed by a topological structure of the single-core armored cable. According to the method, the topological structure and the impedance information of the single-core armored cable are considered in the process of constructing the preset analysis model, so that the constructed preset analysis model is closer to reality, and the obtained electromagnetic transient analysis result of the single-core armored cable is more accurate.

Description

Technical Field

[0001] The present application relates to the technical field of single-core armored cables, and in particular to an electromagnetic transient analysis method, device, equipment, storage medium and program product for single-core armored cables. Background Art

[0002] Single-core armored cable is a common power cable with a strong mechanical protective layer. It is mainly used in application environments that require enhanced durability and resistance to external physical damage. Single-core armored cables may be affected by extreme conditions such as electromagnetic interference and transient overvoltage during operation. Electromagnetic transient analysis can predict the response behavior of cables under high voltage or high current, avoid failures caused by overheating or breakdown, and ensure the safe operation of the system. Therefore, electromagnetic transient analysis has irreplaceable value for the safety, design optimization, anti-interference ability and system reliability of single-core armored cables.

[0003] At present, in the process of electromagnetic transient analysis of single-core armored cables, the electromagnetic response of the single-core armored cables in a preset environment is usually analyzed. However, the above electromagnetic transient analysis method has the problem of inaccurate analysis. Summary of the invention

[0004] Based on this, it is necessary to provide an electromagnetic transient analysis method, device, equipment, storage medium and program product for a single-core armored cable that can improve the analysis accuracy in response to the above technical problems.

[0005] In a first aspect, the present application provides an electromagnetic transient analysis method for a single-core armored cable, the method comprising: obtaining impedance information per unit length of the single-core armored cable and target evaluation parameters corresponding to the single-core armored cable; the target evaluation parameters include regional parameters of a target area and all grid parameters in the target area;

[0006] The impedance information per unit length of the single-core armored cable and the target evaluation parameters are input into a preset analysis model to perform electromagnetic transient analysis of the single-core armored cable to obtain analysis results; the preset analysis model is constructed based on the topological structure of the single-core armored cable.

[0007] In a second aspect, the present application also provides an electromagnetic transient analysis device for a single-core armored cable, the device comprising:

[0008] An acquisition module is used to acquire impedance information per unit length of a single-core armored cable and target evaluation parameters corresponding to the single-core armored cable; the target evaluation parameters include regional parameters of a target area and all grid parameters in the target area;

[0009] The analysis module is used to input the impedance information per unit length of the single-core armored cable and the target evaluation parameters into a preset analysis model to perform electromagnetic transient analysis of the single-core armored cable to obtain analysis results; the preset analysis model is constructed based on the topological structure of the single-core armored cable.

[0010] In a third aspect, the present application further provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the electromagnetic transient analysis method of the single-core armored cable described in the first aspect is implemented.

[0011] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the electromagnetic transient analysis method for a single-core armored cable as described in the first aspect above.

[0012] In a fifth aspect, the present application further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the electromagnetic transient analysis method of the single-core armored cable described in the first aspect above.

[0013] The electromagnetic transient analysis method, device, equipment, storage medium and program product of the above-mentioned single-core armored cable obtains the impedance information of the unit length of the single-core armored cable and the target evaluation parameters corresponding to the single-core armored cable, and then inputs the impedance information of the unit length of the single-core armored cable and the target evaluation parameters into the preset analysis model to perform electromagnetic transient analysis of the single-core armored cable to obtain analysis results. Among them, the target evaluation parameters include the regional parameters of the target area and all grid parameters in the target area, and the preset analysis model is constructed by the topological structure of the single-core armored cable. In the above method, the topological structure and impedance information of the single-core armored cable are taken into account in the process of constructing the preset analysis model, so the constructed preset analysis model is closer to reality, so that the electromagnetic transient analysis results of the single-core armored cable are more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is an internal structure diagram of a computer device in one embodiment;

[0015] Figure 2 It is a schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in one embodiment;

[0016] Figure 3 A schematic cross-sectional view of a single-core armored cable in one embodiment;

[0017] Figure 4 A schematic diagram of electric field vectors in a single grid in one embodiment;

[0018] Figure 5 A schematic diagram of magnetic field vectors in a single grid in one embodiment;

[0019] Figure 6 A schematic diagram of electromagnetic field vectors in a single grid in one embodiment;

[0020] Figure 7 A schematic diagram of a segmented single-core armored cable model in an FDTD grid in one embodiment;

[0021] Figure 8 A schematic diagram of magnetic field values ​​at a port of a single-core armored cable in one embodiment;

[0022] Fig. 9 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0023] Fig.10 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0024] Fig.11 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0025] Fig.12 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0026] Fig.13 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0027] Fig.14 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0028] Fig.15 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0029] Fig.16 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0030] Fig.17 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0031] Fig.18 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0032] Fig.19 A schematic diagram of a flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment;

[0033] Fig. 20 It is a schematic flow chart of an electromagnetic transient analysis method for a single-core armored cable in another embodiment. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] Single-core armored cable is a common power cable with a strong mechanical protective layer. It is mainly used in application environments that require enhanced durability and resistance to external physical damage. Single-core armored cables may be affected by extreme working conditions such as electromagnetic interference and transient overvoltage during operation. Electromagnetic transient analysis can predict the response behavior of cables under high voltage or high current, avoid failures caused by overheating or breakdown, and thus ensure the safe operation of the system. Therefore, electromagnetic transient analysis has irreplaceable value for the safety, design optimization, anti-interference ability and system reliability of single-core armored cables. At present, in the process of electromagnetic transient analysis of single-core armored cables, the electromagnetic response of single-core armored cables in a preset environment is usually analyzed. However, the above-mentioned electromagnetic transient analysis method has the problem of inaccurate analysis. The present application provides an electromagnetic transient analysis method for a single-core armored cable, which aims to solve the above-mentioned technical problems. The following embodiments will specifically illustrate the electromagnetic transient analysis method for a single-core armored cable described in the present application.

[0036] The electromagnetic transient analysis method of the single-core armored cable provided in the embodiment of the present application can be applied to Figure 1 The computer device shown in the figure can be a terminal or a server, and its internal structure diagram can be as shown in Figure 1As shown, the computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for electromagnetic transient analysis of a single-core armored cable is realized. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0037] Those skilled in the art will understand that Figure 1 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0038] In one embodiment, Figure 2 As shown in the figure, a method for electromagnetic transient analysis of a single-core armored cable is provided. Figure 1 The computer device in the example is used to illustrate, including the following steps:

[0039] S201, obtaining impedance information per unit length of a single-core armored cable and target evaluation parameters corresponding to the single-core armored cable. The target evaluation parameters include area parameters of a target area and all grid parameters in the target area.

[0040] The target area is a simulation area for electromagnetic transient analysis of the single-core armored cable simulation model. The target area includes the model corresponding to the simulated object, which can be the simulation model of the single-core armored cable simulation model and the simulation model corresponding to the adjacent area. The regional parameters include the target area size and the excitation condition. The target area size is the space extending outward by about 50% on the basis of all the simulated objects to eliminate the influence of boundary effects, stray signal refraction and reflection, etc. The excitation condition represents the load set in the form of space electromagnetic field or concentrated circuit parameter element at the specified position according to actual needs. The grid parameters include grid size, time step, and material parameters in the grid. The grid size is determined by the topological structure of the simulated object. The grid size is smaller in the area of ​​the simulated object with fine structure, and larger in the area where the electromagnetic field changes slowly, so as to achieve the effect of considering both simulation accuracy and efficiency. The material parameters in the grid include target conductivity, target dielectric constant, and target permeability. The selection range of the time step is determined by the minimum grid size, which must meet the Courant-Friedrich-Levy (CFL) criterion to prevent data divergence, oscillation, non-convergence, and other problems that may occur in time domain calculations, that is,

[0041]

[0042] In the formula, Δx, Δy, Δz are the minimum grid sizes in the three orthogonal directions of X, Y, and Z, and c is the propagation speed of light in the corresponding medium. In general, the time step is selected as the maximum value in the above formula to reduce the number of simulations and improve simulation efficiency.

[0043] The cross-section of single-core armored cable can be found in Figure 3 As shown, the single-core armored cable includes three conductors and dielectrics between the conductors. The three conductors are conductor A, conductor B, and conductor C from the inside to the outside. The dielectric between conductors A and B is dielectric AB, and the dielectric between conductors B and C is dielectric BC. The outer surface radius of conductor A is ra, the inner surface radius of conductor B is rb, the outer surface radius of conductor B is rc, the inner surface radius of conductor C is rd, and the outer surface radius of conductor C is re.

[0044] The impedance information includes the loss impedance of the current in conductor A on the outer surface a of conductor A. , the loss impedance of conductor A current contribution on the inner surface b of conductor B , the loss impedance of conductor A current contribution on the outer surface c of conductor B , the loss impedance of conductor B's current contribution on the inner surface b of conductor B , the loss impedance of conductor B current contribution on the outer surface c of conductor B , the currents in conductors A and B contribute to the loss impedance on the inner surface d of conductor C , the currents in conductors A and B contribute to the loss impedance on the outer surface e of conductor C , the loss impedance of the conductor C current contribution on the inner surface d of the conductor C , the loss impedance of the conductor C current contribution on the outer surface of the conductor C .

[0045] In an embodiment of the present application, the computer device can construct a single-core armored cable simulation model according to the topological structure of the single-core armored cable in advance, and then determine the target area according to the size of the single-core armored cable simulation model, and divide the target area into grids to obtain multiple grids, and finally set the single-core armored cable simulation model on the edge of the grid.

[0046] Specifically, the target area can be meshed according to the FDTD algorithm to obtain multiple grids, as follows: First, the target area is discretized into a set of parallelepiped grids through FDTD orthogonal grids. The electromagnetic field in each grid is assumed to be uniformly distributed. The grid size should be increased in areas where the electromagnetic field changes dramatically, such as the air-soil interface, the air-conductor interface, etc. Large-size grids can be used in areas where the electromagnetic field changes slowly, such as the air or soil. Take the lower left vertex of each parallelepiped grid as the origin, and define the electric field vectors Ex, Ey, and Ez pointing to the three orthogonal directions of XYZ on the three edges connected to the origin (see Figure 4 As shown in the figure, the magnetic field vectors Hx, Hy, and Hz pointing to the three orthogonal directions of XYZ are defined perpendicular to the three planes connected to the origin (see Figure 5 As shown in Figure 2), the electromagnetic field vector in a single grid is finally obtained (see Figure 6 As shown). The electric field and magnetic field vectors in each direction need to set the corresponding initial material parameters according to the relative spatial position, including the initial conductivity σ, the initial dielectric constant ε and the initial magnetic permeability μ. When a group of FDTD grids are arranged together to form the FDTD target area, the electromagnetic field vectors are spatially staggered by half a spatial step (i.e., the grid size), and the electromagnetic vectors surround and surround each other, that is, the electric field vector in a certain direction is surrounded by four magnetic field vectors, and vice versa. The electromagnetic field vectors are also staggered in time by half a time step, that is, the overall electric field vector and the overall magnetic field vector are always 0.5Δt apart. The above space-time characteristics meet the characteristics of solving Maxwell's discrete equations, because the electric field vector and the magnetic field vector can be solved alternately step by step. Usually, a complete electromagnetic transient analysis requires tens of thousands of step-by-step iterations until the preset convergence conditions are met or the preset number of iterations is reached.

[0047] The single-core armored cable model is set up in the FDTD grid as follows: Figure 7As shown in the figure, the cable model needs to be constructed on the edge of the FDTD grid, and its radial size is much smaller than the FDTD grid size, that is, there is no need to use the FDTD grid to discretize and solve its radial structure. The axial size of the model is discretized into several segments through the FDTD grid in the corresponding direction, and each segment of the model coincides with the electric field vector at the corresponding position in space.

[0048] In an embodiment of the present application, the computer device can obtain the impedance information of the unit length of the single-core armored cable in advance according to the initial conductivity σ, the initial dielectric constant ε and the initial magnetic permeability μ, and save the impedance information of the unit length of the single-core armored cable under a preset path. When it is necessary to perform electromagnetic transient analysis on the single-core armored cable, the impedance information of the unit length of the single-core armored cable under the preset path can be called when the target evaluation parameters input by the user on the interface are received, and then the electromagnetic transient analysis of the single-core armored cable is performed according to the impedance information of the unit length of the single-core armored cable and the target evaluation parameters corresponding to the single-core armored cable. Among them, the method for determining the impedance information of the unit length of the single-core armored cable can be: first obtain the frequency-varying impedance of the unit length of the single-core armored cable, and then perform time domain conversion on the frequency-varying impedance to obtain the impedance information of the unit length of the single-core armored cable.

[0049] First, the method to obtain the frequency-dependent impedance per unit length of a single-core armored cable is as follows: under broadband impact, the current frequency range usually covers DC to several megahertz, and due to the existence of the skin effect, the current distribution in the conductor is different at different frequencies. When the frequency is low, the current distribution tends to be uniform, and when the frequency is high, the current distribution is concentrated at the inner and outer boundaries of the conductor cross section. For a single-core armored cable per unit length, the loss impedance contributed by the current in conductor A on the outer surface a of conductor A is , the loss impedance contributed by the current in conductor A on the inner surface b of conductor B , the loss impedance contributed by the current in conductor A on the outer surface c of conductor B , the loss impedance contributed by the current in conductor B on the inner surface b of conductor B , the loss impedance contributed by the current in conductor B on the outer surface c of conductor B , the loss impedance contributed by the currents in conductors A and B on the inner surface d of conductor C , the loss impedance contributed by the currents in conductors A and B on the outer surface e of conductor C , the loss impedance contributed by the current in conductor C on the inner surface d of conductor C , the loss impedance contributed by the current in conductor C on the outer surface e of conductor C It can be obtained by the following function:

[0050]

[0051]

[0052]

[0053]

[0054]

[0055]

[0056]

[0057]

[0058]

[0059] in, is a plural identifier, is the angular frequency, , are the modified Bessel functions of the first kind of order 0 and 1, , are the modified Bessel functions of the second kind of order 0 and 1. , , , , . , , and They are the initial magnetic permeability, initial dielectric constant and initial conductivity of single-core armored cable conductor A respectively. , , and They are the initial magnetic permeability, initial dielectric constant and initial conductivity of single-core armored cable conductor B respectively. , , and They are the initial magnetic permeability, initial dielectric constant and initial conductivity of the single-core armored cable conductor C respectively.

[0060] Secondly, the method of converting the frequency-varying impedance into time domain and obtaining the impedance information per unit length of the single-core armored cable is as follows: The impedance calculated by the above formula is expressed as an impedance parameter characteristic curve that changes with frequency, which cannot be directly substituted into the time domain equation of the FDTD algorithm for solution. It is necessary to use the vector matching technique (VFT) to fit and convert the complex impedance parameter characteristics into a set of rational functions, and then substitute them into the time domain simulation calculation in the form of convolution. Through the vector matching method, the frequency characteristic curve of the impedance per unit length of the single-core armored cable can be fitted in the complex frequency domain as follows:

[0061]

[0062]

[0063]

[0064]

[0065]

[0066]

[0067]

[0068]

[0069]

[0070] Where s represents the complex frequency domain, and N is the vector matching order. for The DC component of for The emotional weight of for The remainder of for The extreme point. for The DC component of for The emotional weight of for The remainder of for The extreme point. for The DC component of for The emotional weight of for The remainder of for The extreme point. for The DC component of for The emotional weight of for The remainder of for The extreme point. for The DC component of for The emotional weight of for The remainder of for The extreme point. for The DC component of for The emotional weight of for The remainder of for The extreme point. for The DC component of for The emotional weight of for The remainder of for The extreme point. for The DC component of for The emotional weight of for The remainder of for The extreme point. for The DC component of for The emotional weight of for The remainder of for It should be noted that as many frequency points as possible can be uniformly selected within each frequency order of magnitude of the original characteristic frequency curve to improve the accuracy of curve fitting.

[0071] S202, inputting the impedance information per unit length of the single-core armored cable and the target evaluation parameters into a preset analysis model to perform electromagnetic transient analysis of the single-core armored cable to obtain analysis results.

[0072] Among them, the preset analysis model is constructed based on the topological structure of the single-core armored cable, and the preset analysis model is used to analyze the electric field information, magnetic field information, and current information of the single-core armored cable. The preset analysis model includes an electric field analysis model, a magnetic field analysis model, and a current analysis model. The analysis results include external information and internal information of the single-core armored cable. The external information includes electric field information and magnetic field information; the internal information includes the current distribution of each conductor of the single-core armored cable and the voltage distribution in the dielectric.

[0073] In an embodiment of the present application, a computer device can pre-construct a preset analysis model based on the topological structure of the single-core armored cable and the impedance information per unit length of the single-core armored cable. Specifically, in the process of constructing the electric field analysis model, the overall electric field model can be constructed first, and then the axial electric field model at the single-core armored cable model can be constructed; in the process of constructing the magnetic field analysis model, the overall magnetic field model can be constructed first, and then the magnetic field model at the port of the single-core armored cable model can be constructed; in the process of constructing the current analysis model, the axial current model of each section of the single-core armored cable model can be constructed first, and then the current distribution model in the single-core armored cable can be constructed. When constructing the current distribution model in the single-core armored cable, the total current model of conductor A and conductor B in the single-core armored cable model, the conductor A current model, the conductor B current model and the conductor C current model can be constructed respectively.

[0074] After the computer device obtains the impedance information and target evaluation parameters of the unit length of the single-core armored cable based on the above steps, the impedance information and target evaluation parameters of the unit length of the single-core armored cable can be input into the preset analysis model to perform electromagnetic transient analysis of the single-core armored cable to obtain analysis results. Optionally, preset conditions can be set in advance, and then after the computer device obtains the impedance information and target evaluation parameters of the unit length of the single-core armored cable based on the above steps, the impedance information, target evaluation parameters and preset conditions of the unit length of the single-core armored cable are input into the preset analysis model to perform electromagnetic transient analysis of the single-core armored cable, and the electric field and magnetic field vectors in the target area are solved by repeated iterations. Each iteration is equivalent to updating the electromagnetic field quantity in the target area in time and estimating it to the next time step Δt, thereby realizing the step-by-step solution of the electromagnetic field quantity in time. When the calculation iteration meets the preset conditions, the electromagnetic field calculation is terminated and the analysis results are output.

[0075] The electromagnetic transient analysis method of the single-core armored cable provided in the embodiment of the present application obtains the impedance information per unit length of the single-core armored cable and the target evaluation parameters corresponding to the single-core armored cable, and then inputs the impedance information per unit length of the single-core armored cable and the target evaluation parameters into a preset analysis model to perform electromagnetic transient analysis of the single-core armored cable and obtain analysis results. Among them, the target evaluation parameters include the regional parameters of the target area and all grid parameters in the target area, and the preset analysis model is constructed by the topological structure of the single-core armored cable. In the above method, the topological structure and impedance information of the single-core armored cable are taken into account in the process of constructing the preset analysis model, so the constructed preset analysis model is closer to reality, and the electromagnetic transient analysis result of the single-core armored cable obtained is more accurate.

[0076] In one embodiment, the above-mentioned preset analysis model includes an electric field analysis model, a magnetic field analysis model and a current analysis model. On this basis, a specific implementation method for performing electromagnetic state analysis on a single-core armored cable is also provided, such as Figure 8 As shown, the above step S202 of "inputting the impedance information per unit length of the single-core armored cable and the target evaluation parameters into the preset analysis model to perform electromagnetic state analysis of the single-core armored cable to obtain analysis results" includes:

[0077] S301, inputting impedance information per unit length of the single-core armored cable and target evaluation parameters into an electric field analysis model to perform electric field analysis and obtain electric field analysis results.

[0078] Among them, the electric field analysis model is used to analyze the electric field environment of the single-core armored cable. The electric field analysis results include the overall electric field information and the axial electric field information of the single-core armored cable.

[0079] In the embodiment of the present application, the computer device can construct an electric field analysis model in advance according to the initial material parameters in the grid. After the computer device obtains the impedance information and target evaluation parameters per unit length of the single-core armored cable, the impedance information and target evaluation parameters per unit length of the single-core armored cable can be input into the electric field analysis model for electric field analysis and electric field analysis results. Specifically, the overall electric field model of the single-core armored cable model can be updated using the target dielectric constant, and the axial electric field model at the single-core armored cable model can be updated using the impedance information per unit length of the single-core armored cable.

[0080] S302, inputting the electric field analysis result, the impedance information per unit length of the single-core armored cable and the target evaluation parameter into the magnetic field analysis model to perform magnetic field analysis and obtain the magnetic field analysis result.

[0081] Among them, the magnetic field analysis model is used to analyze the magnetic field environment of the single-core armored cable. The magnetic field analysis results include the overall magnetic field information and the magnetic field information at the port of the single-core armored cable.

[0082] In the embodiment of the present application, the computer device can construct a magnetic field analysis model in advance according to the initial material parameters in the grid. After the computer device obtains the electric field analysis results, the impedance information per unit length of the single-core armored cable, and the target evaluation parameters, the electric field analysis results, the impedance information per unit length of the single-core armored cable, and the target evaluation parameters can be input into the magnetic field analysis model to perform magnetic field analysis and obtain the magnetic field analysis results. Specifically, the overall magnetic field model of the single-core armored cable model can be updated using the target magnetic permeability, and the magnetic field model at the port of the single-core armored cable model can be updated using the electric field analysis results and the impedance information per unit length of the single-core armored cable.

[0083] S303, inputting the magnetic field analysis result and the impedance information per unit length of the single-core armored cable into a current analysis model to perform current analysis and obtain a current analysis result.

[0084] Among them, the current analysis model is used to analyze the internal current distribution of the single-core armored cable. The current analysis results include the axial current information of each section of the single-core armored cable and the current distribution information within the single-core armored cable. The current distribution information within the single-core armored cable includes the total current of the first conductor and the second conductor, the first conductor current, the second conductor current and the third conductor current. The first conductor is conductor A, the second conductor is conductor B, and the third conductor is conductor C.

[0085] In the embodiment of the present application, the computer device can construct a current analysis model in advance according to the initial material parameters in the grid. After the computer device obtains the magnetic field analysis result and the impedance information per unit length of the single-core armored cable, the magnetic field analysis result and the impedance information per unit length of the single-core armored cable can be input into the current analysis model to perform current analysis and obtain the current analysis result. Specifically, the axial current information of each section of the single-core armored cable can be analyzed first, and then the current distribution information in the single-core armored cable can be analyzed.

[0086] In one embodiment, the electric field analysis model includes a first electric field analysis sub-model and a second electric field analysis sub-model. On this basis, a specific implementation method for performing electric field analysis on a single-core armored cable is also provided, such as Fig. 9 As shown, the above step S301 of "inputting the impedance information per unit length of the single-core armored cable and the target evaluation parameters into the electric field analysis model for electric field analysis, and obtaining the electric field analysis results" includes:

[0087] S401, inputting target evaluation parameters into the first electric field analysis sub-model to perform electric field analysis and obtain initial electric field analysis results.

[0088] Among them, the first electric field analysis sub-model is the overall electric field model of the single-core armored cable model.

[0089] In the embodiment of the present application, after receiving the target evaluation parameters, the computer device can use the target dielectric constant in the target evaluation parameters to update the first electric field analysis submodel to obtain the initial electric field analysis results. Specifically, the iterative update process involves the electric field vector value of the previous time step and the four magnetic field vectors surrounding the electric field vector, as follows:

[0090]

[0091] in, , , are the electric field vectors in three orthogonal directions, i, j, k are the position numbers of the electric field vector based on the FDTD grid numbering, and n represents the number of time steps. , They represent the initial conductivity and target dielectric constant in the corresponding space respectively.

[0092] S402, inputting the initial electric field analysis result and the impedance information per unit length of the single-core armored cable into the second electric field analysis sub-model to obtain the electric field analysis result.

[0093] The second electric field analysis sub-model is an axial electric field model of the single-core armored cable model. The second electric field analysis sub-model is used to correct the axial electric field of the single-core armored cable.

[0094] In the embodiment of the present application, after receiving the initial electric field analysis result and the impedance information per unit length of the single-core armored cable, the computer device can update the second electric field analysis sub-model using the impedance information per unit length of the single-core armored cable and the initial electric field analysis result to obtain the electric field analysis result. Specifically, the iterative update process can be performed by inverse Laplace transforming to a time domain convolution form to update the axial FDTD electric field vector that coincides with the single-core armored cable model, as follows:

[0095]

[0096] in, , , , . and is the convolution term, and the iterative calculation formula is as follows

[0097]

[0098]

[0099] In the formula,

[0100]

[0101]

[0102] To ensure the stability of the simulation, the time step can be appropriately reduced when combined with the time domain convolution calculation. According to current practical experience, it is generally necessary to reduce the time step to between 0.8 and 0.9 times.

[0103] In one embodiment, the magnetic field analysis model includes a first magnetic field analysis sub-model and a second magnetic field analysis sub-model. On this basis, a specific implementation method for performing magnetic field analysis on a single-core armored cable is also provided, such as Fig.10As shown, the above step S302 of "inputting the electric field analysis results, the impedance information per unit length of the single-core armored cable and the target evaluation parameters into the magnetic field analysis model to perform magnetic field analysis to obtain the magnetic field analysis results" includes:

[0104] S501, obtaining historical voltage distribution information in a single-core armored cable.

[0105] In the embodiment of the present application, the computer device can calculate the historical voltage distribution information in the single-core armored cable in the following way:

[0106] In a single-core armored cable, the voltage distribution on dielectric AB and dielectric BC can be solved by the transmission line equation, and the calculation equation is summarized as follows:

[0107]

[0108]

[0109] In the formula, , , is the relative dielectric constant of dielectric AB, is the relative dielectric constant of dielectric BC.

[0110] S502, inputting historical voltage distribution information, electric field analysis results and target evaluation parameters into a first magnetic field analysis sub-model to perform magnetic field analysis and obtain initial magnetic field analysis results.

[0111] Among them, the first magnetic field analysis sub-model is the overall magnetic field model of the single-core armored cable model.

[0112] In the embodiment of the present application, after the computer device obtains the historical voltage distribution information in the single-core armored cable based on the above steps, the historical voltage distribution information, the electric field analysis results and the target evaluation parameters can be input into the first magnetic field analysis sub-model to perform magnetic field analysis to obtain the initial magnetic field analysis results. Specifically, it can be expressed by the following relationship:

[0113]

[0114] In the formula is the target magnetic permeability, is the target magnetic permeability, which is generally set to 0. Among them, the magnetic permeability corresponding to the four orthogonal magnetic field vectors surrounding the axial direction of the single-core armored cable model has been replaced by the target magnetic permeability.

[0115] S503, inputting the initial magnetic field analysis result, the electric field analysis result and the impedance information per unit length of the single-core armored cable into the second magnetic field analysis sub-model to obtain the magnetic field analysis result.

[0116] The second magnetic field analysis sub-model is a magnetic field model at the port of the single-core armored cable model. The second magnetic field analysis sub-model is used to correct the magnetic field at the port of the single-core armored cable.

[0117] In the embodiment of the present application, after receiving the initial magnetic field analysis results, electric field analysis results and impedance information per unit length of the single-core armored cable, the computer device can use the initial magnetic field analysis results, electric field analysis results and impedance information per unit length of the single-core armored cable to update the second magnetic field analysis sub-model to obtain the magnetic field analysis results. Specifically, at the port of the single-core armored cable, since the port voltages of dielectric AB and dielectric BC are exposed, when calculating the four magnetic field vectors surrounding the cable, the influence of the port voltages of dielectric AB and dielectric BC on the magnetic field vector needs to be considered. Taking a section of a single-core armored cable with its axis arranged along the X direction as an example, at the port , , , The magnetic field vector calculation equations need to be superimposed and The impact of Fig.11 As shown. For example, the magnetic field vector is The correction formula for the moment is:

[0118]

[0119] In one embodiment, the current analysis model includes a first current sub-model and a second current sub-model, and the current analysis result includes the axial current of each section of the single-core armored cable and the current distribution information in the single-core armored cable. On this basis, a specific implementation method for current analysis of the single-core armored cable is also provided, such as Fig.12 As shown, the above step S303 of "inputting the magnetic field analysis result and the impedance information per unit length of the single-core armored cable into the current analysis model to perform current analysis and obtain the current analysis result" includes:

[0120] S601, inputting the magnetic field analysis result into the first current sub-model to perform current analysis to obtain the axial current of each section of the single-core armored cable.

[0121] Among them, the first current sub-model is the axial current model of each section of the single-core armored cable model.

[0122] In the embodiment of the present application, after obtaining the magnetic field analysis result, the computer device can use the magnetic field analysis result to update the first current sub-model to obtain the axial current of each section of the single-core armored cable. Specifically, the total current used for the axial electric field calculation of the single-core armored cable in the next cycle is , estimated by the integral of the magnetic field vector loop at time n+1 / 2 in the FDTD target region, for a single-core armored cable model with the axis x and the mth section, the total current flowing through the cross section of the single-core armored cable is The calculation equation is as follows:

[0123]

[0124] Where m represents the position number corresponding to the FDTD grid after the single-core armored cable is segmented along the axial direction.

[0125] S602, inputting historical voltage distribution information, axial current of each section of the single-core armored cable and impedance information per unit length of the single-core armored cable into a second current sub-model for current analysis to obtain current distribution information in the single-core armored cable.

[0126] Among them, the second current sub-model is a current distribution model in a single-core armored cable.

[0127] In the embodiment of the present application, after obtaining the historical voltage distribution information, the axial current of each section of the single-core armored cable, and the impedance information per unit length of the single-core armored cable, the computer device can use the historical voltage distribution information, the axial current of each section of the single-core armored cable, and the impedance information per unit length of the single-core armored cable to update the second current sub-model to obtain the current distribution information in the single-core armored cable. Specifically, (1) the total current of the conductor A and the conductor B of the single-core armored cable The calculation is obtained from the historical conductor AB current, the total cable current, the conductor A current, the conductor B current and the dielectric BC voltage distribution. The calculation formula is as follows:

[0128]

[0129] In the formula, the equations for solving the coefficients are as follows:

[0130]

[0131]

[0132]

[0133]

[0134]

[0135]

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142]

[0143] in, , , , and is the convolution term, and the iterative calculation formula is as follows

[0144]

[0145]

[0146]

[0147]

[0148]

[0149] In the formula,

[0150]

[0151]

[0152]

[0153] .

[0154] (2) The current calculation of conductor A of a single-core armored cable is obtained by the historical conductor A current, the total cable current and the dielectric AB voltage distribution. The calculation formula is as follows:

[0155]

[0156] In the formula, the equations for solving the coefficients are as follows:

[0157]

[0158]

[0159]

[0160]

[0161]

[0162]

[0163]

[0164]

[0165]

[0166]

[0167] in, and is the convolution term, and the iterative calculation formula is as follows:

[0168]

[0169]

[0170]

[0171]

[0172] In the formula,

[0173]

[0174]

[0175] .

[0176] (3) Current in conductor B

[0177] The current calculation of conductor B of the single-core armored cable is obtained by subtracting the current of conductor A from the total current of conductors A and B at the current moment, that is:

[0178]

[0179] (4) Current in conductor C

[0180] The current calculation of conductor C of the single-core armored cable is obtained by subtracting the total current of conductors A and B from the total current at the current moment, that is:

[0181]

[0182] In one embodiment, a specific implementation method for performing electromagnetic transient analysis on a single-core armored cable is also provided, such as Fig.13 As shown, the "obtaining target evaluation parameters" in the above step S201 includes:

[0183] S701, obtaining initial material parameters.

[0184] Among them, the model correction parameters include the corrected dielectric constant, that is, the target node.

[0185] In an embodiment of the present application, after the computer device constructs a single-core armored cable simulation model in the target area, the initial material parameters can be stored in a preset path. When electromagnetic transient analysis of the single-core armored cable is required, the initial material parameters can be obtained from the preset path.

[0186] S702, updating the initial material parameters according to the intrinsic radius of the grid, the radial grid size, and the outer radius of the single-core armored cable to obtain target evaluation parameters.

[0187] In the embodiment of the present application, the lossy single-core armored cable model is arranged on an edge in a certain orthogonal direction in the FDTD grid and coincides with the electric field vector in that direction, such as Fig.14 As shown. The outer surface radius of conductor A of the single-core armored cable is ra, the inner surface radius of conductor B is rb, the outer surface radius of conductor B is rc, the inner surface radius of conductor C is rd, and the outer surface radius of conductor C is re. The principle of constructing a single-core armored cable model based on cross-scale modeling technology is as follows Fig.15 When the axial electric field vector of FDTD is assigned a value of 0, a lossless single-core armored cable model with a radius of r0 can be constructed in the FDTD target area, as shown in Fig.16 and Fig.17 As shown. Among them, r0 is called the intrinsic radius of the FDTD grid. Through multiple solutions and analyses of the electric field distribution near the single-core armored cable model, it can be known that the relationship between the intrinsic radius (r0) and the radial grid size (Δs) is:

[0188] .

[0189] Our modeling goal is to construct a lossy single-core armored cable with an outer radius of rc in the FDTD target region, such as Fig.18 and Fig.19 To do this, Fig.16 and Fig.17 The dielectric constant and magnetic permeability between the conductor surface and the virtual circular surface with a radius of Δs (shown by a dotted line in the figure) are corrected by the correction factor m, so that the mutual capacitance and mutual inductance between the conductor surface and the virtual circular surface after correction are equal to Fig.18 and Fig.19 The mutual capacitance and mutual inductance in are equal, that is, a single-core armored cable model that meets the requirements is constructed without FDTD mesh discretization. The correction coefficient m can be obtained by the following formula

[0190]

[0191] The correction coefficient can be directly calculated from the radial FDTD grid size around the single-core armored cable model and the outer radius of the single-core armored cable. It should be noted that the selection of the outer radius re of the single-core armored cable has a limited range. Too large or too small an outer radius will cause the calculation results to diverge. Based on a large number of simulation cases, the recommended selection range of re is .

[0192] Based on the obtained correction coefficient, the material parameters attached to the electric field vector and magnetic field vector around the single-core armored cable model can be modified to construct an equivalent single-core armored cable model. The material parameter correction method is as follows:

[0193] First, the dielectric constants corresponding to the four orthogonal electric field vectors perpendicular to the axis of the single-core armored cable model are multiplied by the correction coefficient to obtain the target dielectric constant ε', as shown in Fig.16 As shown, and replace the original dielectric constant at the corresponding position:

[0194]

[0195] Secondly, the magnetic permeability corresponding to the four orthogonal magnetic field vectors surrounding the axial direction of the single-core armored cable model is divided by the correction coefficient to obtain the target magnetic permeability. ,like Fig.17 As shown, and replace the original magnetic permeability at the corresponding position:

[0196] .

[0197] Combining all the above embodiments, Fig. 20As shown, a method for electromagnetic transient analysis of a single-core armored cable is also provided, the method comprising: obtaining impedance information per unit length of the single-core armored cable, initial material parameters, and obtaining historical voltage distribution information in the single-core armored cable. The initial material parameters are updated according to the intrinsic radius of the grid, the radial grid size, and the outer radius of the single-core armored cable to obtain target evaluation parameters. The target evaluation parameters are input into the first electric field analysis submodel for electric field analysis to obtain initial electric field analysis results. The initial electric field analysis results and the impedance information per unit length of the single-core armored cable are input into the second electric field analysis submodel to obtain electric field analysis results. The second electric field analysis submodel is used to correct the axial electric field in which the single-core armored cable is located. The historical voltage distribution information, the electric field analysis results, and the target evaluation parameters are input into the first magnetic field analysis submodel for magnetic field analysis to obtain initial magnetic field analysis results. The initial magnetic field analysis results, the electric field analysis results, and the impedance information per unit length of the single-core armored cable are input into the second magnetic field analysis submodel to obtain magnetic field analysis results. The second magnetic field analysis submodel is used to correct the magnetic field at the port of the single-core armored cable. The magnetic field analysis results are input into the first current sub-model for current analysis to obtain the axial current of each section of the single-core armored cable. The historical voltage distribution information, the axial current of each section of the single-core armored cable, and the impedance information per unit length of the single-core armored cable are input into the second current sub-model for current analysis to obtain the current distribution information in the single-core armored cable.

[0198] The method described in the embodiment of the present application divides the FDTD target area into two parts, namely, the inside of the single-core armored cable and the outside of the single-core armored cable; the traditional FDTD algorithm is used for the outside of the single-core armored cable, and the electromagnetic field quantity distribution characteristics under spatial transient impact are solved through spatial discretization and electromagnetic field quantity iteration; the single-core armored cable adopts cross-scale modeling technology, and does not require extremely fine grid discretization. The single-core armored cable model can be equivalently constructed by correcting the material parameters around the single-core armored cable; the electromagnetic distribution inside the single-core armored cable is solved by the multi-conductor segmented transmission line method, and the current distribution flowing through each conductor of the single-core armored cable and the voltage distribution in the dielectric can be accurately calculated under the premise of considering the frequency-varying loss; the frequency-varying resistance per unit length of the single-core armored cable The impedance is obtained by using Bessel function, and the current, voltage waveforms and frequency-dependent losses in the single-core armored cable under broadband impact are analyzed from a macroscopic perspective; the frequency-dependent impedance is fitted into a rational function by using the appropriate matching method, and the impedance characteristics considering the broadband effect are embedded in the FDTD electromagnetic field vector time domain calculation through the inverse Laplace transform; the internal electromagnetic field of the single-core armored cable affects the electromagnetic environment outside the cable through the electromagnetic loss on the outer surface of the outer conductor and the dielectric voltage at the cable port, and the electromagnetic field outside the single-core armored cable affects the electromagnetic field inside the single-core armored cable through the spatial magnetic field loop integral in the adjacent area of ​​the cable; the internal and external electromagnetic fields of the single-core armored cable are bidirectionally coupled in each calculation cycle, which can ensure the accuracy of the calculation results.

[0199] Based on the same inventive concept, an embodiment of the present application further provides an electromagnetic transient analysis device for a single-core armored cable for implementing the electromagnetic transient analysis method for a single-core armored cable involved above.

[0200] In one embodiment, an electromagnetic transient analysis device for a single-core armored cable is provided, comprising: an acquisition module 11, used to acquire impedance information per unit length of the single-core armored cable and target evaluation parameters corresponding to the single-core armored cable; the target evaluation parameters include regional parameters of the target area and all grid parameters in the target area. An analysis module 12, used to input the impedance information per unit length of the single-core armored cable and the target evaluation parameters into a preset analysis model to perform electromagnetic transient analysis of the single-core armored cable and obtain an analysis result; the preset analysis model is constructed based on the topological structure of the single-core armored cable.

[0201] In one embodiment, the above-mentioned analysis module 12 includes: an electric field analysis unit, which is used to input the impedance information per unit length of the single-core armored cable and the target evaluation parameters into the electric field analysis model to perform electric field analysis and obtain electric field analysis results. A magnetic field analysis unit, which is used to input the electric field analysis results, the impedance information per unit length of the single-core armored cable and the target evaluation parameters into the magnetic field analysis model to perform magnetic field analysis and obtain magnetic field analysis results. A current analysis unit, which is used to input the magnetic field analysis results and the impedance information per unit length of the single-core armored cable into the current analysis model to perform current analysis and obtain current analysis results.

[0202] In one embodiment, the electric field analysis unit includes: a first electric field analysis subunit, which is used to input the target evaluation parameter into the first electric field analysis submodel to perform electric field analysis and obtain an initial electric field analysis result; a second electric field analysis subunit, which is used to input the initial electric field analysis result and the impedance information per unit length of the single-core armored cable into the second electric field analysis submodel to obtain the electric field analysis result; the second electric field analysis submodel is used to correct the axial electric field in which the single-core armored cable is located.

[0203] In one embodiment, the magnetic field analysis unit includes: an acquisition subunit for acquiring historical voltage distribution information in a single-core armored cable. A first magnetic field analysis subunit for inputting historical voltage distribution information, electric field analysis results, and target evaluation parameters into a first magnetic field analysis submodel for performing magnetic field analysis to obtain an initial magnetic field analysis result. A second magnetic field analysis subunit for inputting initial magnetic field analysis results, electric field analysis results, and impedance information per unit length of the single-core armored cable into a second magnetic field analysis submodel to obtain a magnetic field analysis result; the second magnetic field analysis submodel is used to correct the magnetic field at the port of the single-core armored cable.

[0204] In one embodiment, the current analysis unit includes: a first current analysis subunit, which is used to input the magnetic field analysis result into the first current submodel for current analysis to obtain the axial current of each section of the single-core armored cable. A second current analysis subunit, which is used to input the historical voltage distribution information, the axial current of each section of the single-core armored cable and the impedance information per unit length of the single-core armored cable into the second current submodel for current analysis to obtain the current distribution information in the single-core armored cable.

[0205] In one embodiment, the acquisition module 11 includes: an acquisition unit for acquiring initial material parameters; an update unit for updating the initial material parameters according to the intrinsic radius of the grid, the radial grid size and the outer radius of the single-core armored cable to obtain target evaluation parameters.

[0206] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the electromagnetic transient analysis method of the single-core armored cable described in any of the above embodiments is implemented.

[0207] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the electromagnetic transient analysis method of the single-core armored cable described in any of the above embodiments is implemented.

[0208] In one embodiment, a computer program product is provided, including a computer program, which, when executed by a processor, implements the electromagnetic transient analysis method for a single-core armored cable described in any of the above embodiments.

[0209] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc.

[0210] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above-mentioned embodiments only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of this application. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several deformations and improvements can be made, which all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be based on the attached claims.

Claims

1. A method for electromagnetic transient analysis of a single-core armored cable, characterized in that: The method comprises: Obtaining impedance information per unit length of a single-core armored cable and target evaluation parameters corresponding to the single-core armored cable; the target evaluation parameters include area parameters of a target area and all grid parameters in the target area; The impedance information per unit length of the single-core armored cable and the target evaluation parameters are input into a preset analysis model to perform electromagnetic transient analysis of the single-core armored cable to obtain analysis results; the preset analysis model is constructed based on the topological structure of the single-core armored cable.

2. The method according to claim 1, characterized in that The preset analysis model includes an electric field analysis model, a magnetic field analysis model and a current analysis model. The impedance information per unit length of the single-core armored cable and the target evaluation parameter are input into the preset analysis model to perform electromagnetic state analysis of the single-core armored cable, and the analysis results are obtained, including: Inputting the impedance information per unit length of the single-core armored cable and the target evaluation parameter into the electric field analysis model to perform electric field analysis and obtain the electric field analysis result; Inputting the electric field analysis result, the impedance information per unit length of the single-core armored cable and the target evaluation parameter into the magnetic field analysis model to perform magnetic field analysis to obtain a magnetic field analysis result; The magnetic field analysis result and the impedance information per unit length of the single-core armored cable are input into the current analysis model to perform current analysis and obtain the current analysis result.

3. The method according to claim 2, characterized in that The electric field analysis model includes a first electric field analysis sub-model and a second electric field analysis sub-model. The impedance information per unit length of the single-core armored cable and the target evaluation parameter are input into the electric field analysis model to perform electric field analysis. The electric field analysis result includes: Inputting the target evaluation parameters into the first electric field analysis sub-model to perform electric field analysis to obtain initial electric field analysis results; The initial electric field analysis results and the impedance information per unit length of the single-core armored cable are input into the second electric field analysis sub-model to obtain the electric field analysis results; the second electric field analysis sub-model is used to correct the axial electric field in which the single-core armored cable is located.

4. The method according to claim 3, characterized in that The magnetic field analysis model includes a first magnetic field analysis sub-model and a second magnetic field analysis sub-model, and the electric field analysis result, the impedance information per unit length of the single-core armored cable, and the target evaluation parameter are input into the magnetic field analysis model to perform magnetic field analysis, and obtain the magnetic field analysis result, including: Obtaining historical voltage distribution information in the single-core armored cable; Inputting the historical voltage distribution information, the electric field analysis result and the target evaluation parameter into the first magnetic field analysis sub-model to perform magnetic field analysis to obtain an initial magnetic field analysis result; The initial magnetic field analysis results, the electric field analysis results and the impedance information per unit length of the single-core armored cable are input into the second magnetic field analysis sub-model to obtain the magnetic field analysis results; the second magnetic field analysis sub-model is used to correct the magnetic field at the port of the single-core armored cable.

5. The method according to claim 4, characterized in that The current analysis model includes a first current sub-model and a second current sub-model, and the current analysis result includes the axial current of each section of the single-core armored cable and the current distribution information in the single-core armored cable. The magnetic field analysis result and the impedance information per unit length of the single-core armored cable are input into the current analysis model for current analysis to obtain the current analysis result, including: Inputting the magnetic field analysis result into the first current sub-model to perform current analysis to obtain the axial current of each section of the single-core armored cable; The historical voltage distribution information, the axial current of each section of the single-core armored cable and the impedance information per unit length of the single-core armored cable are input into the second current sub-model for current analysis to obtain the current distribution information in the single-core armored cable.

6. The method according to any one of claims 1 to 5, characterized in that: The obtaining of the target evaluation parameter corresponding to the single-core armored cable includes: Get initial material parameters; The initial material parameters are updated according to the intrinsic radius of the grid, the radial grid size and the outer radius of the single-core armored cable to obtain target evaluation parameters.

7. An electromagnetic transient analysis device for a single-core armored cable, characterized in that: The device comprises: An acquisition module, used to acquire impedance information per unit length of a single-core armored cable and target evaluation parameters corresponding to the single-core armored cable; the target evaluation parameters include area parameters of a target area and all grid parameters in the target area; The analysis module is used to input the impedance information per unit length of the single-core armored cable and the target evaluation parameters into a preset analysis model to perform electromagnetic transient analysis of the single-core armored cable to obtain analysis results; the preset analysis model is constructed based on the topological structure of the single-core armored cable.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

Images