High-voltage cable connector force, heat and electromagnetic multi-field coupling simulation analysis method

Abstract

According to the force, heat and electromagnetic multi-field coupling simulation analysis method for the high-voltage cable connector, an electromagnetic, heat and force multi-field coupling method is adopted to calculate interface pressure and electric field distribution in a complex environment, and contribution of multiple effects and insulation dielectric loss to the temperature is considered; by establishing a cable connector assembly model, the change of the interface pressure between insulation interfaces of the high-voltage cable connector along with the temperature during thermal expansion and contraction is truly reflected. Interface pressure and electric field distribution in a complex environment can be calculated by adopting an electromagnetic, thermal and force multi-field coupling method; the contribution of multiple effects such as Joule effect, eddy current effect and insulation dielectric loss to the temperature is considered; through the compression device, the change of the interface pressure between insulation interfaces of the cable connector along with the temperature during thermal expansion and contraction can be reflected more truly.

Description

Technical Field

[0001] The present invention relates to the technical field of simulation analysis methods, and in particular to a force, heat and electromagnetic multi-field coupling simulation analysis method for a high-voltage cable connector. Background Art

[0002] High-voltage cable connectors play an important role in connecting and transitioning power transmission lines, and are an indispensable component to ensure the normal operation of the power system. Since the use of high-voltage cables, power cable connectors have remained the weakest link in the power supply system. Insulation breakdown and burning accidents of distribution network cable connectors often occur, causing adverse effects on people's production and life. At present, the industry mainly simulates high-voltage cable assembly products with a single influencing factor. However, in actual use, the product is also affected by multiple factors such as mechanical compressive stress, ambient temperature changes, heat and electric fields generated by current. Therefore, it is very necessary to establish a research on the three-field coupling simulation technology of high-voltage cable connectors: force, heat, and electromagnetic.

[0003] A search revealed a method for detecting defects in high-voltage cable intermediate joints in 2020111224558.X. This method constructs a multi-field coupled calculation model for cable intermediate joints based on electromagnetic-temperature-fluid coupling. Comsol finite element simulation software is used to perform multi-field coupled analysis in air and water environments, obtaining the temperature distribution of the cable intermediate joint and forming a data set on the intermediate joint's operating status. This approach focuses on electromagnetic-temperature-fluid coupling in cable joints.

[0004] No solution has been found in the prior art to conduct technical research on the coupling of force, heat and electromagnetic fields of high-voltage cable connectors. Summary of the Invention

[0005] In response to the deficiencies of the above-mentioned prior art, the present invention proposes a force, heat, and electromagnetic multi-field coupling simulation analysis method for high-voltage cable connectors. The electromagnetic, thermal, and force multi-field coupling method can be used to calculate the interface pressure and electric field distribution in complex environments; multiple effects such as the Joule effect, eddy current effect, and the contribution of insulation dielectric loss to temperature are taken into account; and a compression device is used to more realistically reflect the changes in interface pressure between the various insulation interfaces of the cable connector during thermal expansion and contraction with temperature.

[0006] The technical means adopted by the present invention to solve the above problems are: Disclosed is a simulation analysis method for high-voltage cable connectors using force, heat, and electromagnetic multi-field coupling. The method uses electromagnetic, thermal, and force multi-field coupling to calculate interface pressure and electric field distribution in complex environments. It also considers the contribution of multiple effects, such as the Joule effect, eddy current effect, and insulation dielectric loss to temperature. Springs are used to more realistically reflect how the interface pressure between the insulation interfaces of the cable connector changes with temperature during thermal expansion and contraction.

[0007] Furthermore, the cable connector assembly model includes a cable copper conductor and a cable insulation layer laid on one side of the cable copper conductor, and a copper core is provided at one end of the cable copper conductor and the cable insulation layer; a stress cone is provided on the cable insulation layer, and the stress cone includes a stress cone semi-conductive rubber and a stress cone insulating rubber that are bonded to the side of the overall cone-shaped structure; a compression device is provided on the non-bonded side of the stress cone insulating rubber and the stress cone semi-conductive rubber.

[0008] Furthermore, the stress cone is interference fit with the cable insulation layer.

[0009] Furthermore, the cable copper conductor, cable insulation layer and stress cone form a cavity, a fixed block is provided on one side of the cable insulation layer, and the fixed block is supported between the epoxy joint and the cable insulation layer; the epoxy joint, the fixed block and the copper core and the cable copper conductor are connected as one.

[0010] Furthermore, the interior of the copper core is a special-shaped structure with a cavity; it includes a connecting arm 1 that is overlapped with the end of the cable copper conductor and is arranged opposite to the connecting arm 1; the connecting arm 2 is a special-shaped plate that extends above the cable insulation layer; the connecting arm 1 and the connecting arm 2 are connected by a transition arm; the connecting arm 2 covers the top of the fixed block.

[0011] Further, the following steps are included: S1. Establishing the initial geometric model: First, establish the geometric model in the mechanics module and establish the geometric model of each component of the cable connector; S2. Define the corresponding materials for each component; S3. Establish a mechanical field geometry model for the cable connector assembly, create a mechanical field mesh model, and mesh each component separately. S4. Set boundary conditions and load steps for the cable connector component. S5. After the calculation is completed, the deformed geometric configuration is exported; S6. Enter the Electrostatics module and import the deformed geometry from the previous step. Mirror the geometry and construct a rectangle with an area at least twice the model area. Treat this as an air domain, so that all components form a single entity. S7. Define the corresponding materials for each component separately. The material properties taken in different field calculations are inconsistent, so the materials need to be defined multiple times. Material definition is to assign corresponding material properties to each component. For example, in the mechanical field, the Poisson's ratio and elastic modulus need to be set for each component, and the Poisson's ratio and elastic modulus of each component will be different.

[0012] S8. Build an electrical computational geometry model for the cable connector assembly, establish an electrical computational meshing model, and mesh each component separately. S9. Set electric field boundary conditions and excitation for the cable connector assembly; S10. The software calculates the dielectric loss of the insulation part; S11. Enter the electromagnetic temperature coupling field and repeat steps S6, S7, and S8; S12. Set electromagnetic temperature field boundary conditions and excitation for the cable connector assembly; S13 outputs the temperature distribution data of the entire cable connector; S14. Enter the mechanics section again, import the temperature distribution data based on the mechanical interference and loading model results, and define the thermal expansion of each component material; S15. Define the corresponding materials for each component; S16. Set boundary conditions and load steps for the cable connector component, where the boundary conditions and load steps are S4. S17. Outputs the interface pressure between components under complex working conditions and the deformed geometry. During thermal expansion and contraction, the load on the fixed block will continuously change due to the extension or compression of the spring. S18. Import the geometry exported in the previous step into the electrostatic field module, repair and mirror the geometric interference, and then construct a rectangle as the air domain. The area of the rectangle is at least twice the area of the model. All components form a whole. S19. Repeat steps S7, S8, and S9 to calculate the electric field results after the force, heat, and electromagnetic multi-field coupling results are obtained; S20. Output the electric field distribution of the cable connector under the final complex working conditions.

[0013] Furthermore, the method adopted in step S1 is to export the sketch in dxf format from Autocad to the simulation software.

[0014] Furthermore, the specific operation of step S4 is: all constraints of the epoxy joint: constrain all translation and rotation degrees of freedom U1=U2=U3=UR1=UR2=UR3=0.

[0015] Furthermore, the cable copper conductor and the copper core are bound to each other, the stress cone semi-conductive rubber is bound to the stress cone insulating rubber, the cable copper conductor and the cable insulation layer are bound to each other, and the epoxy joint and the copper core are bound to each other; The stress cone is placed in contact with the compression device, epoxy joint, and cable insulation layer; The stress cone and the cable insulation layer are subjected to interference loading; after the loading is completed, a displacement is applied to one end of the compression device to push the compression device toward the direction of the stress cone semi-conductive rubber.

[0016] Furthermore, the specific operations of step S12 are: inputting current into one end of the cable copper conductor and outputting current at the other end; applying thermal convection boundary conditions to the entire cable connector surface; and inputting the dielectric loss of the insulation part calculated by the previous electrostatic field as a heat source.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In view of the fact that existing high-voltage cable assembly products are simultaneously affected by multiple factors such as mechanical compressive stress, ambient temperature, and heat and electric fields generated by current in actual use, the force, heat, and electromagnetic three-field coupling simulation method of the present invention can calculate the interface pressure and electric field distribution between the various components of the cable connector under complex working conditions.

[0018] The force, heat and electromagnetic three-field coupling simulation method of the present invention can simulate real usage scenarios and improve the service life of high-voltage cable connectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A two-dimensional model diagram of a cable connector assembly for the force, heat, and electromagnetic multi-field coupling simulation analysis method for a high-voltage cable connector according to the present invention; Figure 2 This is a flowchart of the implementation of the force, heat, and electromagnetic multi-field coupling simulation analysis method for high-voltage cable connectors according to the present invention; Figure 3 A schematic diagram of the mechanical field geometry model of the cable connector assembly for the force, heat, and electromagnetic multi-field coupling simulation analysis method of the high-voltage cable connector according to the present invention; Figure 4 This is a schematic diagram of the mechanical field mesh subdivision model of the cable connector component of the high-voltage cable connector force, heat, and electromagnetic multi-field coupling simulation analysis method of the present invention; Figure 5 Schematic diagram of interference and loading; Figure 6 Schematic diagram of the electrical computational geometry model of the cable connector assembly; Figure 7 Schematic diagram of the mesh generation model for electrical calculations of cable connector components; Figure 8 Schematic diagram of electrostatic field excitation and boundary conditions; Figure 9 Schematic diagram of electromagnetic temperature field excitation and boundary conditions; Figure 10 It is a schematic diagram of the interface pressure between the components of the cable connector; Figure 11 Schematic diagram of the electric field distribution of the cable connector;

[0020] In the figure: 1-cable copper conductor, 2-cable insulation layer, 3-stress cone semi-conductive rubber, 4-stress cone insulation rubber, 5-compression device, 6-epoxy joint, 7-cavity, 8-fixing block, 9-copper core, 10-semi-conductive shielding layer, 91-connecting arm 1, 92-connecting arm 2, 93-transition arm. DETAILED DESCRIPTION

[0021] The present invention is further described below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent the actual dimensions of the products. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the accompanying drawings. Example 1

[0022] The multi-field coupled simulation analysis method for high-voltage cable connectors in this embodiment takes into account the fact that existing high-voltage cable assemblies are subject to multiple factors in real-world applications, including mechanical compressive stress, ambient temperature fluctuations, normal operating heat generation, and electric fields. The electromagnetic, thermal, and force multi-field coupled method is used to calculate the interfacial pressure and electric field distribution in complex environments, taking into account the contribution of multiple effects and insulation dielectric loss to temperature. By establishing a cable connector assembly model, the variation in interfacial pressure between the various insulation interfaces of the high-voltage cable connector with temperature during thermal expansion and contraction is realistically reflected.

[0023] like Figure 1 As shown, the cable connector assembly model takes into account various factors and integrates all the components required for simulation. It includes a cable copper conductor 1 and a cable insulation layer 2 laid on one side of the cable copper conductor 1. A copper core 9 is provided at one end of the cable copper conductor 1 and the cable insulation layer 2. A semi-conductive shielding layer 10 is layered on the cable insulation layer 2. A stress cone is attached to the semi-conductive shielding layer 10. The stress cone comprises a semi-conductive rubber 3 and an insulating rubber 4. The semi-conductive rubber 3 and the insulating rubber 4 are attached to the sides of the stress cone, forming an overall cone-shaped structure. A compression device 5 is provided on the side of the insulating rubber 4 that is not bonded to the semi-conductive rubber 3. In this embodiment, the cable copper conductor 1 is laid at the bottom, with the cable insulation layer 2 fixed to its upper surface. A stress cone is provided on the outer surface of the cable insulation layer 2 to form an interference fit with the cable insulation layer 2. The insulating rubber 4 and the semi-conductive rubber 3 form a cone that protrudes from the outer surface of the cable insulation layer 2. A fixing block 8 is provided on one side of the insulating rubber 4, supporting the fixing block 8 between the epoxy joint 6 and the cable insulation layer 2.

[0024] Preferably, the cable copper conductor 1, the cable insulation layer 2, and the stress cone insulation 4 enclose a cavity 7, and the copper core 9 is a special-shaped structure with a hollow interior; it includes a connecting arm 1 91 that overlaps the end of the cable copper conductor 1 and is arranged opposite to the connecting arm 1 91; the connecting arm 2 92 is a special-shaped plate that extends above the cable insulation layer 2; the connecting arm 1 91 and the connecting arm 2 92 are connected by a transition arm 93; the connecting arm 2 92 covers the top of the fixed block 8. In this embodiment, the edge where the connecting arm 2 92 is connected to the epoxy joint 6 is configured to be stepped, and the entire epoxy joint 6 is covered by the top of the connecting arm 2 92 and the edge near the side of the stress cone insulating rubber 4. The compression device 5 is preferably a spring compression device, which is in the shape of a wedge structure and fits in the gap between the stress cone semi-conductive rubber 3 and the epoxy joint 6.

[0025] like Figure 2 As shown in the figure, the high-voltage cable connector force, heat, electromagnetic multi-field coupling simulation analysis method is carried out by establishing the initial geometric A model. Figure 1 The interference fit B and assembly component C in the figure are then subjected to geometric deformation D, and electrostatic analysis E and electromagnetic thermal analysis F are performed respectively to obtain the temperature function G with respect to the coordinates; the temperature distribution data is obtained, and the materials of each component undergo thermal expansion H, and then the interference deformation I is performed, and electrostatic analysis J and mechanical analysis K are performed to obtain the electric field distribution L and stress and pressure M data.

[0026] The specific simulation includes the following steps: S1. Establish the initial geometric model: First, establish the geometric model in the mechanics module, and then establish the geometric model of each component of the cable connector; the method used is to export the dxf format sketch from Autocad to the simulation software.

[0027] S2. Define the corresponding materials for each component.

[0028] S3. Figure 3 For the mechanical field geometry model of the cable connector component, a mechanical field mesh subdivision model is established. Figure 4 Each component is meshed separately and the contact surface mesh is refined.

[0029] S4. Figure 5, the boundary conditions and load steps of the cable connector assembly are set, and the epoxy joint is fully constrained: all translation and rotational degrees of freedom are constrained to U1=U2=U3=UR1=UR2=UR3=0; first perform interference assembly, completely fix the epoxy joint 6 and the compression device 5, perform interference loading on the stress cone and the cable insulation, and then apply load through the compression device 5 for assembly, and the fixed block 8 fixes the unidirectional movement; then completely fix the epoxy joint 6; the specific operations are: bind the cable copper conductor 1 and the copper core 9 to each other, bind the stress cone semi-conductive rubber 3 and the stress cone insulating rubber 4 to each other, bind the cable copper conductor 1 to the cable insulation layer 2, and bind the epoxy joint 6 and the copper core 9 to each other.

[0030] The stress cone semi-conductive rubber 3 is placed in contact with the compression device 5, the epoxy joint 6, and the cable insulation layer 2. The stress cone insulating rubber 4 is placed in contact with the epoxy joint 6, the cable insulation layer 2, and the fixing block 8. The stress cone insulating rubber 4 and the stress cone semi-conductive rubber 3 are interference loaded with the cable insulation layer 2.

[0031] After the interference loading of the stress cone insulating rubber 4 , the stress cone semi-conductive rubber 3 and the cable insulating layer 2 is completed, a displacement is applied to one end of the lumped mechanical system of the compression device 5 to push the fixed block 8 to move.

[0032] S5. After the calculation is completed, the deformed geometric configuration is exported.

[0033] S6. Figure 6 , enter the Electrostatics module and import the deformed geometry from the previous step. Mirror the geometry and then construct a rectangle with an area more than twice the model area. Treat it as an air domain and all components form a whole.

[0034] S7. Define the corresponding materials for each component separately. The material properties taken in different field calculations are inconsistent, so the materials need to be defined multiple times. Material definition is to assign corresponding material properties to each component. For example, in the mechanical field, the Poisson's ratio and elastic modulus need to be set for each component, and the Poisson's ratio and elastic modulus of each component will be different.

[0035] S8. Figure 7 , the electrical calculation geometry model of the cable connector assembly, establish the electrical calculation mesh subdivision model, and mesh each component separately.

[0036] S9. Figure 8 , the electric field boundary conditions and excitation settings are performed on the cable connector assembly; the top of the epoxy joint 6 is set as the ground boundary, and zero voltage and the ground boundary are applied to the upper surface of the semi-conductive shielding layer 10; and the excitation voltage is applied to the copper conductor in the middle of the bottom of the entire model.

[0037] S10. The software calculates the dielectric loss of the insulation part.

[0038] S11. Enter the electromagnetic temperature coupling field and repeat steps S6, S7, and S8.

[0039] S12. Figure 9 , the cable connector assembly performs electromagnetic temperature field boundary conditions and excitation settings; the top of the epoxy joint 6 is set as the thermal convection boundary between the connector and the ambient temperature, and the two sides of the cable copper conductor 1 are set as the current input and current output respectively.

[0040] S13. Output the temperature distribution data of the entire cable connector.

[0041] S14. Enter the mechanics section again, import the temperature distribution data based on the mechanical interference and loading model results, and define the thermal expansion of each component material.

[0042] S15. Define the corresponding materials for each component.

[0043] S16. The cable connector assembly performs boundary condition and load step settings, wherein the boundary conditions and loads are carried over from step S4.

[0044] S17. Figure 10 , output the interface pressure between the components under complex working conditions, and output the deformed geometric configuration. During the movement of the fixed block 8 during thermal expansion and contraction, the load loaded on it will continue to change due to the elongation or compression of the spring.

[0045] S18. Import the geometric configuration exported in the previous step into the electrostatic field module, repair and mirror the geometric interference, and then construct a rectangle as the air domain. The area of the rectangle is more than twice the area of the model; all components form a whole.

[0046] S19. Repeat steps S7, S8, and S9 to calculate the electric field results after obtaining the force, heat, and electromagnetic multi-field coupling results.

[0047] S20. Figure 11 , output the final electric field distribution of the cable connector under complex working conditions.

[0048] The above embodiments are only for the purpose of illustrating the present invention, and are not intended to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of protection of the present invention, and the scope of protection of the present invention should be defined by the claims.

Claims

1. A method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors, characterized in that: The electromagnetic, thermal and mechanical multi-field coupling method is used to calculate the interface pressure and electric field distribution in complex environments, taking into account the contribution of multiple effects and insulation dielectric loss to temperature; By establishing a cable connector component model simulation, the change of interface pressure between the insulation interfaces of the high-voltage cable connector with temperature during thermal expansion and contraction in real scenarios is reflected.

2. The method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors according to claim 1 is characterized in that: The cable connector assembly model comprises a cable copper conductor (1) and a cable insulation layer (2) laid on one side of the cable copper conductor (1); a copper core (9) is provided at one end of the cable copper conductor (1) and the cable insulation layer (2); a stress cone is provided on the cable insulation layer (2); the stress cone comprises a stress cone semi-conductive rubber (3) and a stress cone insulating rubber (4) with the sides being bonded together and forming an overall cone-shaped structure; a compression device (5) is provided on the side of the stress cone insulating rubber (4) that is not bonded to the stress cone semi-conductive rubber (3).

3. The method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors according to claim 2 is characterized in that: The stress cone is interference-fitted with the cable insulation layer (2).

4. The method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors according to claim 3 is characterized in that: The cable copper conductor (1), the cable insulation layer (2) and the stress cone insulating rubber (4) enclose a cavity (7); a fixing block (8) is provided on one side of the cable insulation layer (2); the fixing block (8) is supported between the epoxy joint (6) and the cable insulation layer (2); the epoxy joint (6), the fixing block (8), the copper core (9) and the cable copper conductor (1) are connected as a whole.

5. The method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors according to claim 3 is characterized in that: The copper core (9) has a hollow interior and a special-shaped structure; it includes a connecting arm (91) that is overlapped with the end of the cable copper conductor (1) and is arranged opposite to the connecting arm (91); the connecting arm (92) is a special-shaped plate that extends above the cable insulation layer (2); the connecting arm (91) and the connecting arm (92) are connected by a transition arm (93); the connecting arm (92) covers the top of the fixed block (8).

6. The method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors according to claim 5 is characterized in that: The following steps are involved: S1. Establishing the initial geometric model: First, establish the geometric model in the mechanics module and establish the geometric model of each component of the cable connector; S2. Define the corresponding materials for each component; S3. Establish a mechanical field geometry model for the cable connector assembly, create a mechanical field mesh model, and mesh each component separately. S4. Set boundary conditions and load steps for the cable connector component. S5. After the calculation is completed, the deformed geometric configuration is exported; S6. Enter the Electrostatics module and import the deformed geometry from the previous step. Mirror the geometry and construct a rectangle with an area at least twice the model area. Treat this as an air domain, so that all components form a single entity. S7. Define the corresponding materials for each component; S8. Build an electrical computational geometry model for the cable connector assembly, establish an electrical computational meshing model, and mesh each component separately. S9. Set electric field boundary conditions and excitation for the cable connector assembly; S10. The software calculates the dielectric loss of the insulation part; S11. Enter the electromagnetic temperature coupling field and repeat steps S6, S7, and S8; S12. Set electromagnetic temperature field boundary conditions and excitation for the cable connector assembly; S13 outputs the temperature distribution data of the entire cable connector; S14. Enter the mechanics section again, import the temperature distribution data based on the mechanical interference and loading model results, and define the thermal expansion of each component material; S15. Define the corresponding materials for each component; S16. The cable connector assembly performs boundary condition and load step settings, wherein the boundary conditions and loads are carried over from step S4; S17. Outputs the interface pressure between components under complex working conditions and the deformed geometry. During thermal expansion and contraction, the load on the fixed block will continuously change due to the extension or compression of the spring. S18. Import the geometry exported in the previous step into the electrostatic field module, repair and mirror the geometric interference, and then construct a rectangle as the air domain. The area of the rectangle is at least twice the area of the model. All components form a whole. S19. Repeat steps S7, S8, and S9 to calculate the electric field results after the force, heat, and electromagnetic multi-field coupling results are obtained; S20. Output the electric field distribution of the cable connector under the final complex working conditions.

7. The method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors according to claim 6 is characterized in that: The method adopted in step S1 is to export the sketch in dxf format from Autocad to the simulation software.

8. The method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors according to claim 7 is characterized in that: The specific operation of step S4 is: All constraints of epoxy joint (6): constrain all translation and rotation degrees of freedom U1=U2=U3=UR1=UR2=UR3=0.

9. The method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors according to claim 7, characterized in that: The cable copper conductor (1) and the copper core (9) are bound to each other, the stress cone semi-conductive rubber (3) and the stress cone insulating rubber (4) are bound to each other, the cable copper conductor (1) and the cable insulation layer (2) are bound to each other, and the epoxy joint (6) and the copper core (9) are bound to each other; The stress cone semi-conductive rubber (3) is in contact with the compression device (5), the epoxy joint (6), and the cable insulation layer (2); The stress cone insulating rubber (4) is in contact with the epoxy joint (6), the cable insulating layer (2), and the fixing block (8); The stress cone insulating rubber (4), the stress cone semi-conductive rubber (3) and the cable insulation layer (2) are subjected to interference loading; after the loading is completed, one end of the compression device (5) is loaded with displacement to push the compression device (5) toward the stress cone semi-conductive rubber (3).

10. The method for simulation analysis of force, heat and electromagnetic multi-field coupling of high-voltage cable connectors according to claim 6, characterized in that: The specific operations of step S12 are as follows: current is input into one end of the cable copper conductor (1) and outputted from the other end; a thermal convection boundary condition is applied to the entire surface of the cable connector; and the dielectric loss of the insulation part calculated in the previous electrostatic field is used as a heat source input.

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