Rapid calculation method for GIS thermal radiation distribution and temperature field distribution and related device

Abstract

The invention belongs to the technical field of power equipment insulation structure design, and discloses a GIS thermal radiation distribution and temperature field distribution rapid calculation method and a related device, and the method comprises the steps: building a multi-grid model comprising a plurality of scale grids on a thermal radiation interface in a built GIS finite element simulation model; determining a corresponding relation between the fine grids and the coarse grids; calculating an angle coefficient between the coarse mesh surface units generating heat radiation; calculating radiation emitted by the fine grid surface units and the coarse grid surface units, and establishing a coarse grid-based thermal radiation equation by using an angle coefficient between the coarse grid surface units; calculating effective radiation emitted by the fine grid surface unit and input radiation of the coarse grid surface unit and the fine grid surface unit according to a calculation result of the thermal radiation equation; and calculating the net radiation quantity emitted by the fine grids and a heat transfer equation formed based on fine grid discretization according to the calculation result, and obtaining the temperature field distribution of the GIS. The calculation efficiency can be remarkably improved, and the accuracy of thermal radiation calculation is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of the insulation structure design of power equipment, and particularly relates to a rapid calculation method for the heat radiation distribution and temperature field distribution of a GIS and related devices. Background Art

[0002] In the power system, the gas-insulated switch (GIS), as a core component of high-voltage electrical equipment, plays a crucial role. With its excellent insulation performance, compact structural layout, and high reliability, GIS is widely used in various substations and power transmission networks. However, with the continuous expansion of the power system capacity and the continuous increase in voltage levels, the heating problem of electrical components inside GIS, especially the thermal radiation phenomenon at the fluid-solid interface, has increasingly become a key factor affecting the safe operation and long-term reliability of GIS. Therefore, the power industry urgently needs to develop an efficient and accurate method for calculating the thermal radiation at the fluid-solid interface of gas-insulated switches. GIS is a device that encloses high-voltage electrical components in a metal casing filled with insulating gas. GIS not only solves the operation problems of high-voltage electrical equipment in harsh environments but also significantly reduces maintenance costs and extends the service life of the equipment. The internal structure of GIS is intricate, including numerous electrical components, insulating media, and support structures. When these components are working, due to the Joule heat generated by the current and the heat released by arc discharge, the local temperature will rise sharply. If the heat dissipation is not timely, it will lead to serious consequences such as a decline in insulation performance, accelerated material aging, and even equipment damage. Therefore, the thermal design of GIS has become a key link in evaluating and optimizing its performance. Inside GIS, thermal radiation is an important way of heat transfer. When the temperature of an electrical component rises, its surface will emit energy in the form of electromagnetic waves, that is, thermal radiation is generated. The intensity and direction of thermal radiation are affected by multiple factors such as the temperature of the emitter, material properties, and the geometric shape and temperature distribution of the surrounding environment. Thermal radiation has an important impact on the performance and safe operation of GIS. On the one hand, thermal radiation can accelerate the transfer and diffusion of heat inside GIS, helping to reduce local high temperatures and improve the heat dissipation efficiency; on the other hand, excessive thermal radiation may also cause the temperature of the insulating gas to rise, thereby reducing its insulation performance and even triggering equipment failures. Therefore, accurately calculating the thermal radiation at the fluid-solid interface inside GIS is crucial for evaluating the thermal performance of the equipment, optimizing the heat dissipation design, and ensuring safe operation. However, the internal structure of GIS is complex, containing components with various sizes, shapes, and material properties, resulting in extremely complex temperature distributions and thermal radiation phenomena inside GIS. To accurately calculate the thermal radiation inside GIS, high-precision numerical simulation methods such as the finite element method need to be used. However, if only numerical calculation methods such as finite element and finite volume are used to solve differential equations, when facing large field domains and multi-field coupling problems, restricted by objective conditions such as the number of grids and the non-linear characteristics of physical fields, the problem of a sharp increase in calculation time caused by high calculation complexity and large model scale still cannot be solved. Although fine grid division can improve the calculation accuracy, it will significantly increase the consumption of calculation resources and may cause calculation instability and convergence problems. Summary of the Invention

[0003] To solve the problems existing in the prior art, the purpose of the present invention is to provide a fast calculation method for GIS thermal radiation distribution and temperature field distribution and related devices. The present invention can significantly improve the operation efficiency while ensuring the accuracy of thermal radiation calculation, meet the complex calculation requirements of GIS fluid-solid interface thermal radiation, and lay a foundation for accurately calculating the overall thermal field distribution of GIS.

[0004] To achieve the above object, the present invention is realized by adopting the following technical solutions:

[0005] A fast calculation method for GIS thermal radiation distribution and temperature field distribution, comprising:

[0006] According to the parameters of the preset GIS, establish a finite element simulation model of the GIS, establish a multi-grid model including multiple scale grids on the interface where thermal radiation occurs in the finite element simulation model of the GIS, and determine the corresponding relationship between the fine grid and the coarse grid; the multi-grid model includes a coarse grid and a fine grid;

[0007] Judge whether thermal radiation occurs between the coarse grid surface elements formed by coarse grid meshing. For the coarse grid unit surfaces where thermal radiation occurs, calculate the view factor between the coarse grid surface elements;

[0008] Calculate the radiation emitted by the fine grid surface elements, calculate the radiation emitted by the coarse grid surface elements according to the radiation emitted by the fine grid surface elements, and establish a thermal radiation equation based on the coarse grid according to the radiation emitted by the coarse grid surface elements and the view factor between the coarse grid surface elements;

[0009] Solve the thermal radiation equation to obtain the effective radiation emitted by the coarse grid surface elements. According to the effective radiation emitted by the coarse grid surface elements, calculate the effective radiation emitted by the fine grid surface elements, the incident radiation of the coarse grid surface elements, and the incident radiation of the fine grid surface elements;

[0010] According to the effective radiation emitted by the fine grid surface elements and the incident radiation of the fine grid surface elements, calculate the net radiation amount emitted by the fine grid to the outside, and use the net radiation amount emitted by the fine grid to the outside to solve the heat transfer equation formed by fine grid discretization to obtain the temperature field distribution of the GIS.

[0011] Preferably, the corresponding relationship is obtained by finding the center of the coarse grid surface element closest to the center of the fine grid surface element. There is one and only one coarse grid corresponding to each fine grid, and the surface elements in the fine grid should be on the same interface as the surface elements of the corresponding coarse grid.

[0012] Preferably, the calculation method of the radiation emitted by the fine grid surface elements is as follows:

[0013] E fj =F j ε j σTj 4

[0014] In the formula, E fj is the radiation emitted by the fine grid surface element j, F j is the area of the fine grid surface element j, ε j is the emissivity of the fine grid surface element j, σ is the Boltzmann constant, and T j is the temperature of the fine grid surface element j;

[0015] The radiation emitted by the coarse grid surface element is the sum of the radiation emitted by the corresponding fine grid surface elements, and the calculation method is as follows:

[0016]

[0017] In the formula, E ci is the radiation emitted by the coarse grid surface element i, and M i is the fine grid surface element corresponding to the coarse grid surface element i.

[0018] Preferably, the view factor between the coarse grid surface elements is calculated as follows:

[0019] For any two first coarse grid surface elements and second coarse grid surface elements that can emit thermal radiation, the view factor of the first coarse grid surface element to the second coarse grid surface element is:

[0020]

[0021] In the formula, A 1 , A 2 are the areas of the first coarse grid surface element and the second coarse grid surface element respectively, θ 1 , θ 2 are the angles between the connecting line of the integration points and the normal directions of the first coarse grid surface element and the second coarse grid surface element respectively, and r is the distance of the connecting line of the integration points.

[0022] Preferably, the thermal radiation equation is as follows:

[0023]

[0024] In the formula, J ci is the effective radiation emitted by the coarse grid surface element i, E ci is the radiation emitted by the coarse grid surface element i, ε i is the emissivity of the fine grid surface element i (similar to ε j above), j is the number of all coarse grid surface elements that can emit thermal radiation with the coarse grid surface element i, J cj is the effective radiation emitted by the coarse grid surface element j, and X i,j is the view factor of the coarse grid surface element i to the coarse grid surface element j.

[0025] Preferably:

[0026] The calculation method of the effective radiation emitted by the fine grid surface element is as follows:

[0027] J fj = E fj + P ij (J ci - E ci )

[0028]

[0029] The calculation method of the incident radiation of the coarse grid surface element is as follows:

[0030]

[0031] The calculation method of the incident radiation of the fine grid surface element is as follows:

[0032] G fj = P ij G ci

[0033] In the formula, J fj is the effective radiation emitted by the fine grid surface element j, E fj is the radiation emitted by the fine grid surface element j, P ij is the area coefficient. The area coefficient P ij is the ratio of the area of the fine grid surface element j to the sum of the areas of all the fine grids corresponding to the coarse grid surface element i. J ci is the effective radiation emitted by the coarse grid surface element i, E ci is the radiation emitted by the coarse grid surface element i, F j is the area of the fine grid surface element j, k is the number of the fine grid corresponding to the coarse grid surface element i, M i is the fine grid surface element corresponding to the coarse grid surface element i, F k is the area of the fine grid surface element k, G ci is the incident radiation of the coarse grid surface element i, ε is the emissivity of the coarse grid surface element, G fj is the incident radiation of the fine grid surface element j.

[0034] Preferably:

[0035] The calculation method of the net radiation amount emitted by the fine grid is as follows:

[0036] Q fj = J fj - G fj

[0037] The heat transfer equation formed based on the fine grid discretization is as follows:

[0038]

[0039] In the formula, Q fj is the net radiation emitted outward from the fine grid j, J fj is the effective radiation emitted from the surface element j of the fine grid, G fj is the incident radiation on the surface element j of the fine grid, ρ is the density, c is the heat capacity at constant pressure, T is the temperature, U is the flow velocity, λ is the thermal conductivity, and q is the heat source; the heat source includes the net radiation emitted from the surface element of the fine grid.

[0040] The present invention also provides a fast calculation system for GIS thermal radiation distribution and temperature field distribution, which is used to implement the above fast calculation method of the present invention, including:

[0041] Modeling module: used to establish a finite element simulation model of GIS according to the parameters of the preset GIS, establish a multi-grid model including multiple scale grids on the interface where thermal radiation occurs in the finite element simulation model of GIS, and determine the corresponding relationship between the fine grid and the coarse grid; the multi-grid model includes a coarse grid and a fine grid;

[0042] First calculation module: used to determine whether thermal radiation occurs between the coarse grid surface elements formed by coarse grid meshing, and for the coarse grid cell surfaces where thermal radiation occurs, calculate the view factors between the coarse grid surface elements;

[0043] Second calculation module: used to calculate the radiation emitted from the fine grid surface element, calculate the radiation emitted from the coarse grid surface element according to the radiation emitted from the fine grid surface element, and establish a thermal radiation equation based on the coarse grid according to the radiation emitted from the coarse grid surface element and the view factors between the coarse grid surface elements;

[0044] Third calculation module: used to solve the thermal radiation equation to obtain the effective radiation emitted from the coarse grid surface element, and calculate the effective radiation emitted from the fine grid surface element, the incident radiation on the coarse grid surface element, and the incident radiation on the fine grid surface element according to the effective radiation emitted from the coarse grid surface element;

[0045] Fourth calculation module: used to calculate the net radiation emitted outward from the fine grid according to the effective radiation emitted from the fine grid surface element and the incident radiation on the fine grid surface element, and solve the heat transfer equation formed by discretization based on the fine grid by using the net radiation emitted outward from the fine grid to obtain the temperature field distribution of GIS.

[0046] The present invention also provides an electronic device, including:

[0047] One or more processors;

[0048] A storage device, on which one or more programs are stored;

[0049] When the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the rapid calculation method for GIS thermal radiation distribution and temperature field distribution as described above in the present invention.

[0050] The present invention also provides a storage medium, on which a computer program is stored, wherein when the computer program is executed by a processor, the rapid calculation method for GIS thermal radiation distribution and temperature field distribution as described above in the present invention is implemented.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The rapid calculation method for GIS thermal radiation distribution and temperature field distribution in the present invention comprehensively considers the calculation rate and accuracy of calculating the thermal radiation at the fluid-solid interface. By integrating multiple fine grid surface units into a coarse grid surface unit, the calculation complexity of the view factor matrix is effectively reduced, and the excessive occupation of computing resources by large-scale matrix operations is avoided, thereby significantly improving the calculation efficiency and reducing the solution difficulty of the thermal radiation equation. At the same time, through fine grid division and the establishment of corresponding relationships, the calculation accuracy is ensured within a controllable range, providing a method for accurately calculating the overall thermal field distribution of GIS, achieving a balance between efficiency and accuracy, providing strong numerical support for the design, optimization, and operation reliability evaluation of GIS, and being of great significance for promoting the development of power transmission and distribution systems. Description of the Drawings

[0053] Figure 1 is a flowchart of the rapid calculation method for GIS thermal radiation distribution and temperature field distribution in the present invention;

[0054] Fig. 2(a) is a coarse grid diagram of the interface between gas and other structures in GIS in an embodiment of the present invention;

[0055] Fig. 2(b) is a fine grid diagram of the interface between gas and other structures in GIS in an embodiment of the present invention;

[0056] Figure 3 is a schematic diagram of the corresponding relationship between the coarse grid and the fine grid in an embodiment of the present invention;

[0057] Figure 4 is a schematic diagram of thermal radiation between coarse grids in an embodiment of the present invention;

[0058] Figure 5 is a schematic diagram of calculating the view factor of the integration point on the surface unit in an embodiment of the present invention. Detailed Embodiments

[0059] The present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.

[0060] See Figure 1 , the rapid calculation method for the GIS thermal radiation distribution and temperature field distribution of the present invention includes the following steps:

[0061] Step 1), establish a finite element simulation model of the GIS, clarify the material parameters of the surfaces where thermal radiation occurs in each structure of the GIS, establish a multi-grid model including multiple scale grids, the multi-grid model includes a coarse grid as shown in Figure 2(b) and a fine grid as shown in Figure 2(a), wherein, the coarse grid is used to capture the thermal radiation trend of the radiation surface, and the fine grid is used to accurately calculate the overall temperature field distribution; the thermal radiation occurring in the finite element simulation model of the GIS is all gray body radiation; the multi-grid model should be established on the interface where thermal radiation occurs; the material parameters of the surface where thermal radiation occurs include the emissivity of the interface;

[0062] Step 2), refer to Figure 4 , determine whether thermal radiation occurs between the surface elements formed by the coarse grid meshing: for the connection line of the centers of the surface elements of the coarse grid where thermal radiation occurs, there should be no intersection with the surface grid elements of other surfaces; then calculate the view factor between the surface elements where thermal radiation occurs: refer to Figure 5 , the view factor calculation method between the surface elements includes the Monte Carlo method and the surface-to-surface radiation method; the view factor should satisfy integrity, that is, the sum of all view factors is 1;

[0063] Step 3), refer to Figure 3 , determine the corresponding relationship between the fine grid and the coarse grid: the corresponding relationship is obtained by finding the center of the coarse grid surface element closest to the center of the fine grid surface element, and there is only one coarse grid corresponding to each fine grid, and the surface elements in the fine grid should be on the same interface as the surface elements of the corresponding coarse grid;

[0064] Step 4), calculate the radiation emitted by the fine grid surface element, then calculate the radiation emitted by the coarse grid surface element according to the radiation emitted by the fine grid surface element, and then establish a thermal radiation equation based on the coarse grid according to the radiation emitted by the coarse grid surface element and the view factor between the coarse grid surface elements; the specific calculation process is as follows:

[0065] The calculation method for the radiation emitted by the fine grid surface element is as follows:

[0066] E fj =F j ε j σT j 4

[0067] In the formula, j is the serial number of any fine grid surface element, E fj is the radiation emitted by the fine grid surface element j, F jis the area of the fine grid surface element j, ε j is the emissivity of the fine grid surface element j, σ is the Boltzmann constant, T j is the temperature of the fine grid surface element j;

[0068] The radiation emitted by the coarse grid surface element is the sum of the radiation emitted by the corresponding fine grid surface elements:

[0069]

[0070] In the formula, i is the serial number of any coarse grid surface element, E ci is the radiation emitted by the coarse grid surface element i, M i is the fine grid surface element corresponding to the coarse grid surface element i;

[0071] Taking any two coarse grid surface elements that can emit thermal radiation, the first coarse grid surface element and the second coarse grid surface element as an example, the first coarse grid surface element (i.e., Figure 5 the unit surface 1 shown in Figure 5 ) to the second coarse grid surface element (i.e.,

[0072]

[0073] the unit surface 2 shown in 1 , A 2 are the areas of the coarse grid surface element 1 and the coarse grid surface element 2, θ 1 , θ 2 is the included angle between the connecting line of the integration points and the normal directions of the coarse grid surface elements 1 and 2, r is the distance of the connecting line of the integration points; the view factor should satisfy the integrity, that is, the sum of all view factors is 1;

[0074] In summary, the thermal radiation equation is:

[0075]

[0076] In the formula, J ci is the effective radiation emitted by the coarse grid surface element i, E ci is the radiation emitted by the coarse grid surface element i, ε i is the emissivity of the fine grid surface element i, j is the number of all coarse grid surface elements that can have thermal radiation with the coarse grid surface element, J cj is the effective radiation emitted by the coarse grid surface element j, X i,j is the view factor of the coarse grid surface element i to the coarse grid surface element j;

[0077] Step 5), solve the thermal radiation equation based on the coarse grid to obtain the effective radiation emitted by the coarse grid surface element, and calculate the effective radiation emitted by the fine grid surface element and the incident radiation of the coarse grid surface element and the fine grid surface element according to the effective radiation emitted by the coarse grid surface element; the specific calculation process is as follows:

[0078] The effective radiation emitted by the fine grid surface element is:

[0079] J fj = E fj + P ij (J ci - E ci )

[0080]

[0081] The incident radiation of the coarse grid surface element is:

[0082]

[0083] The incident radiation of the fine grid surface element is:

[0084] G fj = P ij G ci

[0085] In the formula, J fj is the effective radiation emitted by the fine grid surface element j, E fj is the radiation emitted by the fine grid surface element j, P ij is the area coefficient, and the area coefficient P ij is the ratio of the fine grid surface element j to the sum of the areas of all fine grids corresponding to the coarse grid surface element i, J ci is the effective radiation emitted by the coarse grid surface element i, E ci is the radiation emitted by the coarse grid surface element i, F j is the area of the fine grid surface element j, k is the number of the fine grid corresponding to the coarse grid surface element i, M i is the fine grid surface element corresponding to the coarse grid surface element i, F k is the area of the fine grid surface element k, G ci is the incident radiation of the coarse grid surface element i, ε is the emissivity of the coarse grid surface element, G fj is the incident radiation of the fine grid surface element j;

[0086] Step 6), calculate the net radiation amount emitted by the fine grid outward according to the effective radiation and the incident radiation emitted by the fine grid surface element, and solve the heat transfer equation formed by discretizing the fine grid to obtain the temperature field distribution of the GIS;

[0087] Specifically, the net radiation amount is:

[0088] Q fj = J fj - G fj

[0089] Furthermore, the heat transfer equation formed by discretizing based on fine grids is as follows (the following is the heat transfer equation. To calculate the temperature field distribution, the heat transfer equation needs to be discretized, that is, to solve the equation formed after discretizing the heat transfer equation on fine grids. In the heat transfer equation, q is the heat source term, and the heat source term includes the radiation term. After the heat transfer equation is discretized on fine grids, the heat source term and the radiation term part in the heat source term are also discretized on fine grids. The discretized radiation term part on fine grids is the net radiation emitted by all the fine grid surface elements (which can be considered as all the fine grid surface elements) used to discretize the heat transfer equation):

[0090]

[0091] In the formula, Q fj is the net radiation emitted by the fine grid j to the outside, J fj is the effective radiation emitted by the fine grid surface element j, G fj is the incident radiation of the fine grid surface element j, ρ is the density, c is the constant pressure heat capacity, T is the temperature, U is the flow velocity, λ is the thermal conductivity, q is the heat source, and the heat source includes the net radiation emitted by the fine grid surface elements.

[0092] In addition, the embodiment of the present invention also provides a system for implementing the fast calculation method of the above GIS thermal radiation distribution and temperature field distribution of the present invention. The system includes:

[0093] Modeling module: used to establish a finite element simulation model of the GIS according to the parameters of the preset GIS, establish a multi-grid model including multiple scale grids on the interface where thermal radiation occurs in the finite element simulation model of the GIS, and determine the corresponding relationship between the fine grids and the coarse grids; the multi-grid model includes coarse grids and fine grids;

[0094] First calculation module: used to judge whether thermal radiation occurs between the coarse grid surface elements formed by coarse grid meshing. For the coarse grid unit surfaces where thermal radiation occurs, calculate the view factors between the coarse grid surface elements;

[0095] Second calculation module: used to calculate the radiation emitted by the fine grid surface elements, calculate the radiation emitted by the coarse grid surface elements according to the radiation emitted by the fine grid surface elements, and establish a thermal radiation equation based on the coarse grids according to the radiation emitted by the coarse grid surface elements and the view factors between the coarse grid surface elements;

[0096] The third calculation module: It is used to solve the heat radiation equation to obtain the effective radiation emitted by the coarse grid surface elements, and calculate the effective radiation emitted by the fine grid surface elements, the incident radiation of the coarse grid surface elements, and the incident radiation of the fine grid surface elements based on the effective radiation emitted by the coarse grid surface elements;

[0097] The fourth calculation module: It is used to calculate the net radiation amount emitted by the fine grid based on the effective radiation emitted by the fine grid surface elements and the incident radiation of the fine grid surface elements, and solve the heat transfer equation formed by discretizing the fine grid by using the net radiation amount emitted by the fine grid to obtain the temperature field distribution of the GIS.

[0098] The embodiment of the present invention also provides a corresponding electronic device and a computer-readable storage medium for implementing the solution provided by the embodiment of the present invention.

[0099] Among them, the device includes a memory and a processor. The memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device executes the rapid calculation method for the GIS heat radiation distribution and temperature field distribution described in any embodiment of the present application.

[0100] The computer program is stored on the storage medium. Among them, when the computer program is executed by the processor, it implements the rapid calculation method for the GIS heat radiation distribution and temperature field distribution described in any embodiment of the present application.

[0101] Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A fast calculation method for GIS thermal radiation distribution and temperature field distribution, characterized in that: include: According to the preset GIS parameters, a finite element simulation model of the GIS is established, a multi-grid model including multiple scale grids is established on the interface where heat radiation occurs in the finite element simulation model of the GIS, and the corresponding relationship between the fine grid and the coarse grid is determined; The multi-grid model includes a coarse grid and a fine grid; Determine whether thermal radiation occurs between the coarse grid surface units formed by the coarse grid division, and calculate the angular coefficient between the coarse grid surface units for the coarse grid unit surfaces where thermal radiation occurs; Calculate the radiation emitted by the fine mesh surface units, calculate the radiation emitted by the coarse mesh surface units based on the radiation emitted by the fine mesh surface units, and establish a thermal radiation equation based on the coarse mesh according to the radiation emitted by the coarse mesh surface units and the view coefficients between the coarse mesh surface units; Solve the thermal radiation equation to obtain the effective radiation emitted by the coarse mesh surface unit, and calculate the effective radiation emitted by the fine mesh surface unit, the input radiation of the coarse mesh surface unit, and the input radiation of the fine mesh surface unit based on the effective radiation emitted by the coarse mesh surface unit. According to the effective radiation emitted by the fine grid surface units and the input radiation of the fine grid surface units, the net radiation emitted by the fine grid is calculated. The net radiation emitted by the fine grid is used to solve the heat transfer equation based on the discretization of the fine grid to obtain the temperature field distribution of the GIS.

2. A fast calculation method for GIS thermal radiation distribution and temperature field distribution according to claim 1, characterized in that: The corresponding relationship is obtained by finding the center of the coarse mesh surface unit that is closest to the center of the fine mesh surface unit. There is only one coarse mesh corresponding to each fine mesh, and the surface unit in the fine mesh should be on the same interface as the surface unit in the corresponding coarse mesh.

3. The rapid calculation method of GIS thermal radiation distribution and temperature field distribution according to claim 1 is characterized in that: The radiation emitted by the fine mesh surface elements is calculated as follows: E fj =F j e j σT j 4 In the formula, E fj is the radiation emitted by the fine mesh surface element j, F j is the area of ​​fine mesh surface unit j, ε j is the emissivity of the fine mesh surface unit j, σ is the Boltzmann constant, T j is the temperature of fine mesh surface element j; The radiation emitted by a coarse mesh surface element is the sum of the radiation emitted by the corresponding fine mesh surface element, and is calculated as follows: In the formula, E ci is the radiation emitted by the coarse mesh surface unit i, M i is the fine mesh surface unit corresponding to the coarse mesh surface unit i.

4. The rapid calculation method of GIS thermal radiation distribution and temperature field distribution according to claim 1 is characterized in that: The view factor between the coarse mesh surface elements is calculated as follows: For any two first coarse mesh surface units and second coarse mesh surface units capable of thermal radiation, the angular coefficient of the first coarse mesh surface unit to the second coarse mesh surface unit is: Where A1 and A2 are the areas of the first coarse mesh surface unit and the second coarse mesh surface unit, θ1 and θ2 are the angles between the integration point connection line and the normal direction of the first coarse mesh surface unit and the second coarse mesh surface unit, and r is the distance between the integration points.

5. The rapid calculation method of GIS thermal radiation distribution and temperature field distribution according to claim 1 is characterized in that: The heat radiation equation is as follows: In the formula, J ci is the effective radiation emitted by the coarse mesh surface unit i, E ci is the radiation emitted by the coarse mesh surface unit i, ε i is the emissivity of the fine mesh surface unit i, j is the number of all coarse mesh surface units that can generate thermal radiation with the coarse mesh surface unit, J cj is the effective radiation emitted by the coarse mesh surface unit j, X i,j is the angular coefficient of coarse mesh surface element i to coarse mesh surface element j.

6. The rapid calculation method of GIS thermal radiation distribution and temperature field distribution according to claim 1 is characterized by: The effective radiation emitted by the fine mesh surface elements is calculated as follows: J fj =E fj +P ij (J ci -HAVE BEEN ci ) The input radiation calculation method for the coarse grid surface unit is as follows: The input radiation calculation method of the fine mesh surface unit is as follows: G fj =P ij G ci In the formula, J fj is the effective radiation emitted by the fine mesh surface element j, E fj is the radiation emitted by the fine mesh surface element j, P ij is the area coefficient, the area coefficient P ij is the ratio of the area of ​​the fine mesh surface unit j to the sum of the areas of all fine meshes corresponding to the coarse mesh surface unit i, J ci is the effective radiation emitted by the coarse mesh surface unit i, E ci is the radiation emitted by the coarse mesh surface element i, F j is the area of ​​fine mesh surface unit j, k is the number of the fine mesh corresponding to the coarse mesh surface unit i, M i is the fine mesh surface unit corresponding to the coarse mesh surface unit i, F k is the area of ​​the fine mesh surface unit k, G ci is the input radiation of the coarse mesh surface unit i, ε is the emissivity of the coarse mesh surface unit, G fj is the input radiation of fine mesh surface element j.

7. The method for rapidly calculating GIS thermal radiation distribution and temperature field distribution according to claim 1 is characterized in that: The net radiation emitted by the fine grid is calculated as follows: Q fj =J fj -G fj The heat transfer equation based on fine grid discretization is as follows: In the formula, Q fj is the net radiation emitted by fine grid j, J fj is the effective radiation emitted by the fine mesh surface element j, G fj is the input radiation of fine mesh surface unit j, ρ is density, c is constant pressure heat capacity, T is temperature, U is flow velocity, λ is thermal conductivity, and q is heat source; the heat source includes the net radiation emitted by the fine mesh surface unit.

8. A fast calculation system for GIS thermal radiation distribution and temperature field distribution, characterized in that: include: Modeling module: used to establish a finite element simulation model of GIS according to the preset GIS parameters, establish a multi-grid model containing multiple scale grids on the interface where heat radiation occurs in the finite element simulation model of GIS, and determine the corresponding relationship between fine grids and coarse grids; The multi-grid model includes a coarse grid and a fine grid; The first calculation module is used to determine whether thermal radiation occurs between the coarse grid surface units formed by the coarse grid division, and for the coarse grid unit surfaces where thermal radiation occurs, calculate the angular coefficient between the coarse grid surface units; The second calculation module is used to calculate the radiation emitted by the fine mesh surface units, calculate the radiation emitted by the coarse mesh surface units according to the radiation emitted by the fine mesh surface units, and establish a thermal radiation equation based on the coarse mesh according to the radiation emitted by the coarse mesh surface units and the angular coefficients between the coarse mesh surface units; The third calculation module is used to solve the thermal radiation equation to obtain the effective radiation emitted by the coarse mesh surface unit, and calculate the effective radiation emitted by the fine mesh surface unit, the input radiation of the coarse mesh surface unit and the input radiation of the fine mesh surface unit according to the effective radiation emitted by the coarse mesh surface unit; The fourth calculation module is used to calculate the net radiation emitted by the fine grid according to the effective radiation emitted by the fine grid surface unit and the input radiation of the fine grid surface unit, and use the net radiation emitted by the fine grid to solve the heat transfer equation based on the discretization of the fine grid to obtain the temperature field distribution of the GIS.

9. An electronic device, characterized in that: include: one or more processors; a storage device having one or more programs stored thereon; When the one or more programs are executed by the one or more processors, the one or more processors implement the fast calculation method of GIS thermal radiation distribution and temperature field distribution as described in any one of claims 1-7.

10. A storage medium, characterized in that: A computer program is stored thereon, wherein when the computer program is executed by a processor, the method for quickly calculating the GIS thermal radiation distribution and the temperature field distribution as described in any one of claims 1 to 7 is implemented.

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