A method and system for optimizing the position of an epoxy flange in a high voltage cable joint

Abstract

The application discloses an epoxy flange position optimization method and system for a high-voltage cable intermediate joint, and comprises the following steps: inputting preset boundary conditions, preset heat source excitation and preset physical fields of the high-voltage cable intermediate joint into each target finite element model to generate a plurality of target high-voltage cable intermediate joint simulation models; simulating the high-voltage cable intermediate joint corresponding to the preset epoxy flange installation position through each target high-voltage cable intermediate joint simulation model to generate a plurality of external air average flow velocities after simulation explosion of the epoxy flange; and determining the target epoxy flange installation position based on the plurality of external air average flow velocities after simulation explosion of the epoxy flange. The technical problem that the existing epoxy flange installation position may cause explosion and serious combustion phenomenon is solved. The optimal installation position of the epoxy flange is obtained through finite element simulation calculation, and the safety and stability of power system operation are improved.

Description

Technical Field

[0001] This invention relates to the field of high-voltage cable intermediate joint technology, and in particular to a method and system for optimizing the position of epoxy flanges in high-voltage cable intermediate joints. Background Technology

[0002] With societal progress, urban power transmission networks are continuously developing, and power cable lines are gradually replacing overhead lines, becoming the main power transmission method for urban distribution networks. The safety and stability of power cables are crucial to the operational stability and security of the power grid. Cable joints, as weak points in cable lines, are affected by human factors, construction, and operating environment, resulting in numerous combustion and explosion accidents both domestically and internationally each year, jeopardizing the operational safety of the power grid.

[0003] Therefore, in high-voltage cable joints of 110kV and above, some joints connect two copper protective shells together using epoxy flanges. This makes the interface between the epoxy flange and the copper protective shell a weak point in the mechanical stress of the high-voltage cable joint. Typically, the epoxy flange is installed above the stress cone of the prefabricated high-voltage cable joint. However, if a discharge breakdown occurs at the stress cone where this installation location is situated, the epoxy flange will shatter. The shattered section of the prefabricated high-voltage cable joint will be completely exposed to the air, potentially leading to an explosion and severe combustion. Summary of the Invention

[0004] This invention provides a method and system for optimizing the position of epoxy flanges in high-voltage cable intermediate joints, solving the technical problem that when the stress cone at the installation position of the existing epoxy flange is subjected to discharge breakdown, the epoxy flange will crack, and the entire prefabricated high-voltage cable intermediate joint at the cracked point will be completely exposed to the air, which will lead to explosion and serious combustion.

[0005] The first aspect of this invention provides a method for optimizing the position of the epoxy flange of a high-voltage cable intermediate joint, comprising:

[0006] In response to the received epoxy flange position optimization request, obtain the parameter information corresponding to the epoxy flange position optimization request;

[0007] Based on the multiple preset epoxy flange installation positions and structural parameters of the high-voltage cable intermediate joint in the parameter information, multiple geometric models of the high-voltage cable intermediate joint are determined.

[0008] Extract the material parameters corresponding to each of the geometric models, and construct target finite element models of multiple high-voltage cable intermediate joints;

[0009] The preset boundary conditions, preset heat source excitation and preset physical field of the high-voltage cable intermediate joint are respectively input into each of the target finite element models to generate multiple target high-voltage cable intermediate joint simulation models.

[0010] The simulation models of the intermediate joints of the target high-voltage cables are used to simulate the intermediate joints of the high-voltage cables corresponding to the installation positions of the preset epoxy flanges, and the average external air velocity after the simulated explosion of the epoxy flanges is generated.

[0011] Based on the average external air velocity after multiple simulated explosions of the epoxy flanges, the installation location of the target epoxy flange is determined.

[0012] Optionally, it also includes:

[0013] Based on a preset moving sequence, the installation positions of the epoxy flanges are moved according to preset moving intervals to generate multiple preset epoxy flange installation positions.

[0014] Parameter information is generated using the structural parameters of the preset epoxy flange installation positions and the corresponding high-voltage cable intermediate joints.

[0015] Optionally, the step of determining multiple geometric models of the high-voltage cable intermediate joint based on multiple preset epoxy flange installation positions and structural parameters of the high-voltage cable intermediate joint in the parameter information includes:

[0016] Extract the structural parameters of multiple preset epoxy flange installation positions and high-voltage cable intermediate joints from the parameter information;

[0017] Multiple geometric models of the high-voltage cable intermediate joint are constructed using the pre-defined installation positions of the epoxy flanges and the structural parameters of the high-voltage cable intermediate joint.

[0018] Optionally, the step of extracting the material parameters corresponding to each of the geometric models and constructing target finite element models of multiple high-voltage cable intermediate joints includes:

[0019] Extract the material parameters corresponding to each of the geometric models, and construct initial finite element models corresponding to multiple high-voltage cable intermediate joints;

[0020] Remove the epoxy flanges on the high-voltage cable intermediate joints corresponding to each of the initial finite element models to generate multiple updated finite element models;

[0021] A preset area is defined on the overall prefabricated surface directly above the stress cone of the high-voltage cable intermediate joint corresponding to each of the updated finite element models, and multiple target finite element models are generated.

[0022] Optionally, the step of inputting the preset boundary conditions, preset heat source excitation, and preset physical field of the high-voltage cable intermediate joint into each of the target finite element models to generate multiple target high-voltage cable intermediate joint simulation models includes:

[0023] The preset boundary conditions of the high-voltage cable intermediate joint are respectively input into each of the target finite element models to generate multiple initial high-voltage cable intermediate joint simulation models.

[0024] A preset heat source is set on the preset area of ​​the high-voltage cable intermediate joint corresponding to each of the initial high-voltage cable intermediate joint simulation models to generate multiple updated high-voltage cable intermediate joint simulation models.

[0025] The preset physical fields are input into each of the updated high-voltage cable intermediate joint simulation models to generate multiple target high-voltage cable intermediate joint simulation models.

[0026] Optionally, the step of inputting preset physical fields into each of the updated high-voltage cable intermediate joint simulation models to generate multiple target high-voltage cable intermediate joint simulation models includes:

[0027] Couple laminar flow and fluid heat transfer calculations to generate non-isothermal flow.

[0028] The fluid heat transfer and the surface-to-surface radiation are coupled and calculated to generate surface-to-surface radiative heat transfer.

[0029] A preset physical field is generated by employing the non-isothermal flow and the surface-to-surface radiative heat transfer.

[0030] The preset physical fields are input into each of the updated high-voltage cable intermediate joint simulation models to generate multiple target high-voltage cable intermediate joint simulation models.

[0031] Optionally, the step of determining the installation location of the target epoxy flange based on the average external air velocity after the simulated cracking of multiple epoxy flanges includes:

[0032] The average external air velocity after the simulated explosion of each epoxy flange is sorted according to the preset moving order, and a sorting result is generated.

[0033] Select one average external air velocity from the sorting results as the target average external air velocity;

[0034] Determine whether the average external air velocity of the target is less than the average external air velocity of the two adjacent external air velocities corresponding to the average external air velocity of the target.

[0035] If so, the preset epoxy flange installation position corresponding to the average external air velocity of the target is determined as the target epoxy flange installation position;

[0036] If not, select one of the remaining average external air velocities as the target average external air velocity, and then proceed to the step of determining whether the target average external air velocity is less than the two adjacent average external air velocities corresponding to the target average external air velocity.

[0037] The second aspect of this invention provides an epoxy flange position optimization system for high-voltage cable intermediate joints, comprising:

[0038] The parameter information module is used to obtain the parameter information corresponding to the received epoxy flange position optimization request in response to the received epoxy flange position optimization request.

[0039] The geometric model module is used to determine multiple geometric models of the high-voltage cable intermediate joint based on multiple preset epoxy flange installation positions and structural parameters of the high-voltage cable intermediate joint in the parameter information.

[0040] The target finite element model module is used to extract the material parameters corresponding to each of the geometric models and construct the target finite element models of multiple high-voltage cable intermediate joints.

[0041] The target high-voltage cable intermediate joint simulation model module is used to input the preset boundary conditions, preset heat source excitation and preset physical field of the high-voltage cable intermediate joint into each target finite element model to generate multiple target high-voltage cable intermediate joint simulation models.

[0042] The external air average velocity module is used to simulate the high-voltage cable intermediate joints corresponding to the preset epoxy flange installation positions through the simulation models of each target high-voltage cable intermediate joint, and generate the external air average velocity after multiple epoxy flanges are simulated to explode.

[0043] The target epoxy flange installation position module is used to determine the installation position of the target epoxy flange based on the average external air velocity after multiple epoxy flanges have been simulated to burst.

[0044] A third aspect of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor causes the processor to perform the steps of the epoxy flange position optimization method for high-voltage cable intermediate joints as described in any of the preceding claims.

[0045] The fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the epoxy flange position optimization method for high-voltage cable intermediate joints as described in any of the preceding claims.

[0046] As can be seen from the above technical solutions, the present invention has the following advantages:

[0047] This invention addresses the issue of how to position epoxy flanges connected to the copper protective shells on both sides of a high-voltage cable joint. By ensuring that these flanges are not positioned above stress cones where electric fields are concentrated, the invention prevents severe explosions and combustion of the high-voltage cable joint when a discharge breakdown occurs at the stress cone. This reduces the hazards caused by such an explosion. Furthermore, finite element simulation calculations determine the optimal installation position of the epoxy flanges, which plays a crucial role in improving the safety and stability of power system operation. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a flowchart illustrating the steps of an epoxy flange position optimization method for a high-voltage cable intermediate joint according to Embodiment 1 of the present invention.

[0050] Figure 2 This is a flowchart illustrating the steps of an epoxy flange position optimization method for a high-voltage cable intermediate joint according to Embodiment 2 of the present invention.

[0051] Figure 3 This is a schematic diagram of the structure of an epoxy flange before its position is moved, according to Embodiment 2 of the present invention.

[0052] Figure 4 This is a schematic diagram of the structure after the position of an epoxy flange has been moved, according to Embodiment 2 of the present invention.

[0053] Figure 5 This is a schematic diagram of a mesh division method provided in Embodiment 2 of the present invention;

[0054] Figure 6 This is a schematic diagram of a simulation model of a high-voltage cable intermediate joint provided in Embodiment 2 of the present invention;

[0055] Figure 7 This is a simulation diagram of the fluid field when an epoxy flange is located above a stress cone, as provided in Embodiment 2 of the present invention.

[0056] Figure 8 This is a structural block diagram of an epoxy flange position optimization system for a high-voltage cable intermediate joint provided in Embodiment 3 of the present invention.

[0057] The meanings of the reference numerals in the attached figures are as follows:

[0058] 1. Epoxy flange; 2. Stress cone; 3. Short-end copper protective shell; 4. Silicone rubber; 5. XLPE; 6. High-voltage shielding pipe; 7. Crimped pipe; 8. Cable core; 9. Long-end copper protective shell; 10. Laying environment; 11. Epoxy flange cracking; 12. Heat source. Detailed Implementation

[0059] This invention provides a method and system for optimizing the position of epoxy flanges in high-voltage cable intermediate joints. It addresses the technical problem that when discharge breakdown occurs at the stress cone where the existing epoxy flange is installed, the epoxy flange will crack, exposing the entire prefabricated high-voltage cable intermediate joint at the cracked point to the air, which will lead to explosion and serious combustion.

[0060] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0061] Please see Figure 1 , Figure 1 The flowchart illustrates the steps of an epoxy flange position optimization method for a high-voltage cable intermediate joint according to Embodiment 1 of the present invention.

[0062] This invention provides a method for optimizing the position of the epoxy flange of a high-voltage cable intermediate joint, comprising the following steps:

[0063] Step 101: In response to the received epoxy flange position optimization request, obtain the parameter information corresponding to the epoxy flange position optimization request.

[0064] It should be noted that the parameter information includes the installation position of the epoxy flange 1 at the high-voltage cable intermediate joint and the structural parameters of the high-voltage cable intermediate joint. Specifically, at the joint connection of the high-voltage cable intermediate joint, the side connected to the cable is designated as the long end side of the high-voltage cable intermediate joint, while the other side is designated as the short end side copper protective shell 4. The epoxy flange 1 is arranged on the copper protective shell on the long end side of the high-voltage cable intermediate joint to connect the two copper protective shells and reduce the hazards in the event of an explosion of the high-voltage cable intermediate joint.

[0065] In practical implementation, when an epoxy flange position optimization request is received, the parameter information corresponding to the request is obtained. The parameter information includes the installation position of epoxy flange 1 in the high-voltage cable intermediate joint, the structural parameters of the high-voltage cable intermediate joint, and other data.

[0066] Step 102: Based on the multiple preset epoxy flange installation positions and structural parameters of the high-voltage cable intermediate joint in the parameter information, determine multiple geometric models of the high-voltage cable intermediate joint.

[0067] It should be noted that the epoxy flange 1 is installed in the high-voltage cable intermediate joint according to the preset position, and each installation position is recorded to generate the preset epoxy flange installation position.

[0068] In practical implementation, the geometric model of the high-voltage cable intermediate joint is established in COMSOL software using the structural parameters of each preset epoxy flange installation position and the high-voltage cable intermediate joint. Each preset epoxy flange installation position corresponds to a geometric model of a high-voltage cable intermediate joint.

[0069] Step 103: Extract the material parameters corresponding to each geometric model and construct the target finite element model of multiple high-voltage cable intermediate joints.

[0070] It should be noted that the material parameters corresponding to the geometric model are extracted and applied to construct the initial finite element model of the high-voltage cable intermediate joint.

[0071] In practical implementation, the epoxy flange 1 on the high-voltage cable intermediate joint is removed from the initial finite element model to facilitate the simulation of the epoxy flange cracking 11 of the high-voltage cable intermediate joint in reality. A region is divided on the overall prefabricated structure directly above the stress cone 2 of the high-voltage cable intermediate joint. This region is used to simulate the insulation breakdown hole on the overall prefabricated component in the actual process, and the target finite element model of the high-voltage cable intermediate joint can be obtained.

[0072] Step 104: Input the preset boundary conditions, preset heat source excitation and preset physical field of the high-voltage cable intermediate joint into each target finite element model to generate multiple target high-voltage cable intermediate joint simulation models.

[0073] It should be noted that the prefabricated high-voltage cable intermediate joint is laid in a tunnel. Therefore, the preset boundary conditions are set according to the actual laying conditions of the high-voltage cable intermediate joint in the tunnel in order to enhance the simulation effect.

[0074] Specifically, the actual laying conditions include ambient temperature, the length of a single high-voltage cable joint (including part of the cable), and the width and height of the tunnel where the high-voltage cable joint is located.

[0075] The preset heat source excitation is set to mimic the heat source 12 generated when the insulation breaks down through a hole.

[0076] The preset physical fields include physical fields that couple laminar flow, fluid heat transfer, and surface-to-surface radiation.

[0077] In practical implementation, for the target finite element model, according to the actual laying conditions of the high-voltage cable intermediate joint and the heat during the explosion, corresponding boundary conditions and heat source excitation are applied, and physical fields of laminar flow, fluid heat transfer and surface-to-surface radiation are added to obtain the simulation model of the target high-voltage cable intermediate joint.

[0078] Step 105: Simulate the high-voltage cable intermediate joints corresponding to the preset epoxy flange installation positions using simulation models of each target high-voltage cable intermediate joint, and generate the average external air velocity after multiple epoxy flange simulation explosions.

[0079] It should be noted that the simulation model of the target high-voltage cable intermediate joint is used to simulate the high-voltage cable intermediate joint corresponding to each preset epoxy flange installation position, so as to obtain the average external air velocity after the epoxy flange of the high-voltage cable intermediate joint is simulated to explode.

[0080] Specifically, to determine the installation location of epoxy flange 1, a three-dimensional simulation model of the high-voltage cable intermediate joint was established using COMSOL software, and fluid field simulation was performed to obtain the average external air velocity after the epoxy flange was simulated to crack.

[0081] Step 106: Determine the installation location of the target epoxy flange based on the average external air velocity after multiple epoxy flanges are simulated to burst.

[0082] It should be noted that, by comparing the average external air velocity corresponding to each preset epoxy flange installation position with the average external air velocity corresponding to the two adjacent preset epoxy flange installation positions, if the average external air velocity corresponding to the current preset epoxy flange installation position is lower than the average external air velocity corresponding to the two adjacent preset epoxy flange installation positions, then the current preset epoxy flange installation position is determined as the optimal target epoxy flange installation position.

[0083] Please see Figure 2-7 , Figure 2 The flowchart illustrates the steps of an epoxy flange position optimization method for a high-voltage cable intermediate joint according to Embodiment 2 of the present invention.

[0084] This invention provides a method for optimizing the position of the epoxy flange of a high-voltage cable intermediate joint, comprising the following steps:

[0085] Step 201: In response to the received epoxy flange position optimization request, obtain the parameter information corresponding to the epoxy flange position optimization request.

[0086] In this embodiment of the invention, the specific implementation of step 201 is similar to that of step 101, and will not be repeated here.

[0087] Optionally, this method further includes the following steps S11-S12:

[0088] S11. Based on the preset moving sequence, move the installation position of epoxy flange 1 according to the preset moving interval to generate multiple preset epoxy flange installation positions.

[0089] S12. Generate parameter information by using the structural parameters of each preset epoxy flange installation position and the corresponding high-voltage cable intermediate joint.

[0090] It should be noted that, for reference Figures 3-4 It can be seen that the high-voltage cable intermediate joint includes a copper protective shell 9 on the long end side, a copper protective shell 3 on the short end side, an epoxy flange 1, a stress cone 2, silicone rubber 4, XLPE 5, a high-voltage shielding tube 6, a crimping tube 7, and a cable core 8.

[0091] The preset moving sequence involves moving the epoxy flange 1 from directly above the stress cone 2, at 10mm intervals, towards the long end of the copper protective shell 9 of the high-voltage cable intermediate joint. Fluid field simulation calculations are performed on the simulation model after each movement, observing the streamlines of the external airflow around the epoxy flange after it cracks (11). The denser the streamlines, the higher the flow velocity, and the greater the hazard of the explosion. Therefore, by comparing and analyzing the streamline results after the epoxy flange cracks (11) at different locations, the optimal installation position can be determined.

[0092] In practical implementation, let n1 be the position of the epoxy flange 1 directly above the stress cone 2. Moving the epoxy flange 1 towards the long end of the copper protective shell 9 of the high-voltage cable intermediate joint in 10mm increments, with each movement being n... x (x = 2, 3, 4, ..., 19, the maximum length of the copper protective shell 9 on the long end is 200mm, so the maximum moving distance is set to 190mm).

[0093] It is worth mentioning that, under normal circumstances, the epoxy flange 1 is located directly above the stress cone 2. When the high-voltage cable intermediate joint experiences a discharge breakdown at the stress cone 2, it will cause the epoxy flange to crack 11. The entire prefabricated component of the high-voltage cable intermediate joint at the cracked point will be completely exposed to the air, which will lead to an explosion and serious combustion.

[0094] Specifically, the epoxy flange 1 is installed on the left side of the stress cone 2 of the prefabricated high-voltage cable intermediate joint, and must not be located directly above the stress cone 2. It should also be kept at a certain distance from the end of the copper protective shell 9 on the long end side. This can effectively reduce the damage caused by the explosion of the high-voltage cable insulation intermediate joint and ensure the reliable operation of the cable.

[0095] Specifically, parameter information can be obtained by using the 19 preset epoxy flange installation positions and the structural parameters of the high-voltage cable intermediate joints corresponding to each preset epoxy flange installation position.

[0096] Step 202: Extract the structural parameters of multiple preset epoxy flange installation positions and high-voltage cable intermediate joints from the parameter information.

[0097] It should be noted that the structural parameters of the 19 preset epoxy flange installation positions and high-voltage cable intermediate joints in the extracted parameter information are included.

[0098] Step 203: Using the pre-set installation positions of the epoxy flanges and the structural parameters of the high-voltage cable intermediate joint, construct multiple geometric models of the high-voltage cable intermediate joint.

[0099] It should be noted that by inputting the structural parameters of the first preset epoxy flange installation position and the high-voltage cable intermediate joint into the COMSOL software, the geometric model of the first high-voltage cable intermediate joint can be established. Similarly, by inputting the structural parameters of the second preset epoxy flange installation position and the second high-voltage cable intermediate joint into the COMSOL software, the geometric model of the second high-voltage cable intermediate joint can be established, and so on, until the geometric models of the high-voltage cable intermediate joints corresponding to all preset epoxy flange installation positions are established.

[0100] Step 204: Extract the material parameters corresponding to each geometric model and construct the target finite element model of multiple high-voltage cable intermediate joints.

[0101] Optionally, step 204 includes the following steps S21-S23:

[0102] S21. Extract the material parameters corresponding to each geometric model and construct the initial finite element model corresponding to multiple high-voltage cable intermediate joints;

[0103] S22. Remove the epoxy flange 1 on the high-voltage cable intermediate joint corresponding to each initial finite element model to generate multiple updated finite element models.

[0104] S23. Divide the pre-defined area on the overall prefabricated surface directly above the stress cone 2 of the high-voltage cable intermediate joint corresponding to each updated finite element model, and generate multiple target finite element models.

[0105] It should be noted that the initial finite element model refers to the original finite element model initially constructed according to the geometric model.

[0106] Updating the finite element model refers to removing the epoxy flange 1 on the high-voltage cable intermediate joint from the finite element model in the initial finite element model.

[0107] The target finite element model refers to a finite element model of a region defined on the overall prefabricated structure directly above the stress cone 2 of the high-voltage cable intermediate joint in the updated finite element model.

[0108] In practice, the material parameters corresponding to each geometric model are consulted and extracted to construct the initial finite element model for each high-voltage cable intermediate joint. The epoxy flange 1 on the high-voltage cable intermediate joint is removed from the initial finite element model to facilitate the simulation of the epoxy flange cracking 11 of the high-voltage cable intermediate joint in reality. Multiple updated finite element models are obtained, and a region is divided on the overall prefabricated structure directly above the stress cone 2 of the high-voltage cable intermediate joint. This region is used to simulate the insulation breakdown hole on the overall prefabricated component in the actual process, thus obtaining the target finite element model of the high-voltage cable intermediate joint.

[0109] It is worth mentioning that the area of ​​the preset area is based on the area of ​​the perforation hole on the whole precast component in the actual failure case. Specifically, it is set according to the actual situation and is not limited here.

[0110] Step 205: Input the preset boundary conditions, preset heat source excitation and preset physical field of the high-voltage cable intermediate joint into each target finite element model to generate multiple target high-voltage cable intermediate joint simulation models.

[0111] Optionally, step 205 includes the following steps S31-S33:

[0112] S31. Input the preset boundary conditions of the high-voltage cable intermediate joint into each target finite element model to generate multiple initial high-voltage cable intermediate joint simulation models.

[0113] S32. A preset heat source is set on the preset area of ​​the high-voltage cable intermediate joint corresponding to each initial high-voltage cable intermediate joint simulation model to generate multiple updated high-voltage cable intermediate joint simulation models.

[0114] S33. Input the preset physical fields into each updated high-voltage cable intermediate joint simulation model to generate multiple target high-voltage cable intermediate joint simulation models.

[0115] It should be noted that the initial high-voltage cable intermediate joint simulation model refers to the high-voltage cable intermediate joint simulation model generated after adding the preset boundary conditions of the high-voltage cable intermediate joint to the target finite element model.

[0116] Updating the simulation model of a high-voltage cable intermediate joint refers to obtaining a new high-voltage cable intermediate joint simulation model after setting a preset heat source excitation in the preset area of ​​the high-voltage cable intermediate joint in the initial high-voltage cable intermediate joint simulation model.

[0117] The target high-voltage cable intermediate joint simulation model refers to the high-voltage cable intermediate joint simulation model obtained after updating the high-voltage cable intermediate joint simulation model with preset physical field inputs. Before becoming the target high-voltage cable intermediate joint simulation model, the simulation model also needs to be subjected to free tetrahedral meshing (e.g., ...). Figure 5 As shown in the figure, a simulation model of the target high-voltage cable intermediate joint after meshing is established.

[0118] For specific implementation, please refer to Figure 6 Based on the actual laying conditions of the high-voltage cable intermediate joint, the corresponding preset boundary conditions are applied to each target finite element model, resulting in multiple initial high-voltage cable intermediate joint simulation models. According to the heat during the actual explosion, a heat source excitation is set in a region on the overall prefabricated structure directly above the stress cone 2 of the high-voltage cable intermediate joint, resulting in multiple updated high-voltage cable intermediate joint simulation models.

[0119] Specifically, the energy of the heat source excitation is calculated in the following way:

[0120] Assume that the cross-linked polyethylene insulation and silicone rubber insulation of the high-voltage cable joint are partially converted into H2 after thermal decomposition, with a conversion rate of 50%.

[0121] H2 is fully burned and completely consumed during the explosion;

[0122] The energy excited by the heat source is the energy released by the complete combustion of H2, which can be calculated by the following formula:

[0123]

[0124] In the formula, The energy produced by the complete combustion of H2 gas; m total The quality of the cross-linked polyethylene and silicone rubber insulation is lacking; This is the calorific value of H2 gas.

[0125] Specifically, by inputting the physical field obtained from the coupled calculations of laminar flow, fluid heat transfer, and surface-to-surface radiation heat transfer into each updated high-voltage cable intermediate joint simulation model, the target high-voltage cable intermediate joint simulation model can be obtained.

[0126] Optionally, step S33 further includes the following steps S41-S44:

[0127] S41. Couple laminar flow and fluid heat transfer calculations to generate non-isothermal flow;

[0128] S42. Couple the fluid heat transfer and the surface-to-surface radiation calculation to generate surface-to-surface radiation heat transfer.

[0129] S43. Use non-isothermal flow and surface-to-surface radiation heat transfer to generate a preset physical field;

[0130] S44. Input the preset physical fields into each updated high-voltage cable intermediate joint simulation model to generate multiple target high-voltage cable intermediate joint simulation models.

[0131] It should be noted that: 1) Laminar flow:

[0132] mass conservation equation:

[0133]

[0134] Momentum conservation equation:

[0135]

[0136] In equations (2)-(3), ρ represents the divergence of the velocity field, v represents the vector of the velocity field, ρ represents the fluid density, t represents time, p represents the pressure field, μ represents the dynamic viscosity, and g represents the gravity vector.

[0137] 2) Fluid heat transfer:

[0138] Heat conduction equation:

[0139]

[0140] Convection heat transfer equation:

[0141]

[0142] In equations (4)-(5), T1 represents the temperature field, k represents the thermal conductivity, Q represents the heat source, ρ represents the fluid density, and C represents the heat source. p Let represent specific heat capacity, and v represent the vector of the velocity field.

[0143] 3) Surface-to-surface radiative heat transfer:

[0144] J = εe b (T)+ρ d G (6)

[0145] G = G m +G amb +G ext (7)

[0146] G amb =F amb ε amb e b (T amb (8)

[0147] e b (T)=n 2 σT 4 (9)

[0148] In equations (6)-(9), J represents the surface-to-surface radiative heat transfer rate, ε represents the surface coverage rate, and e b (T) represents the blackbody radiant power, which is a function of temperature T, ρ dG represents the absorption coefficient of the material, and G represents the total radiative flux. m G represents the radiation flux generated by the material itself. amb G represents the radiation flux from the environment. ext Let represent the radiative flux from an external radiation source, n represent a constant relevant to the specific problem, σ represent the Stefan-Boltzmann constant, and T represent the temperature.

[0149] In practical implementation, multiphysics coupling calculations are achieved through the following equations:

[0150] 1) Non-isothermal flow – coupling of laminar flow and fluid heat transfer:

[0151]

[0152] F g =ρ ref (1-α p,ref (T) 当 -T ref )g 加 (11)

[0153]

[0154] In equations (10)-(12), Q vd τ represents the viscous dissipation rate, and τ represents the strain rate tensor. F represents the velocity gradient. g ρ represents buoyancy. ref Represents the reference density, α p,ref T represents the coefficient of volumetric expansion at a reference temperature. 当 T represents the current temperature. ref Indicates reference temperature, g 加 ρ represents the acceleration due to gravity, α represents the coefficient of thermal expansion, and ρ represents the coefficient of thermal expansion. 密 Indicates density.

[0155] 2) Surface-to-surface radiative heat transfer – coupling of fluid heat transfer and surface-to-surface radiation

[0156] -N·q=q r.net (13)

[0157] In the formula, N represents the surface normal vector, q represents the heat flux vector, and q r.net This represents the normal component of the heat flux.

[0158] Specifically, by performing multi-physics field coupling calculations of laminar flow, fluid heat transfer, and surface-to-surface radiation on the simulation model of the updated high-voltage cable intermediate joint, the simulation model of the target high-voltage cable intermediate joint can be obtained.

[0159] It is worth mentioning that multiphysics coupling calculations of laminar flow, fluid heat transfer, and surface-to-surface radiation are performed in the simulation model of high-voltage cable intermediate joints. This allows for the understanding of the airflow patterns after the epoxy flange of the high-voltage cable intermediate joint ruptures, with reference to... Figure 7 It is known that when the epoxy flange 1 located above stress cone 2 completely explodes, air rushes into the high-voltage cable intermediate joint from all directions, causing the intermediate joint to burn violently. Subsequently, this model was modified, and the position of the epoxy flange 1 was moved at set intervals. The flow velocity of the external air field after the explosion of the high-voltage cable intermediate joint was analyzed, and the optimal installation position of the epoxy flange 1 was determined based on the simulation results.

[0160] Step 206: Simulate the high-voltage cable intermediate joints corresponding to the preset epoxy flange installation positions using simulation models of each target high-voltage cable intermediate joint, and generate the average external air velocity after multiple epoxy flange simulation explosions.

[0161] It should be noted that, assuming the position of epoxy flange 1 directly above stress cone 2 is n1, and the average external air velocity after the epoxy flange cracks 11 as obtained from the simulation model of the target high-voltage cable intermediate joint is v1, that is, with a moving interval of 10mm, the position moved each time is n. x (x = 2, 3, 4, ..., 19, the maximum length of the copper protective shell 9 on the long end is 200mm, so the maximum moving distance is set to 190mm), the simulated average external air velocity after the epoxy flange cracks 11 is v x (x = 2, 3, 4, ..., 19).

[0162] Step 207: Determine the installation location of the target epoxy flange based on the average external air velocity after multiple epoxy flanges are simulated to burst.

[0163] Optionally, step 207 includes the following steps S51-S55:

[0164] S51. Sort the average external air velocity after each epoxy flange simulates cracking according to the preset moving order, and generate the sorting result.

[0165] S52. Select an average external air velocity from the sorting results as the target average external air velocity.

[0166] S53. Determine whether the average external air velocity of the target is less than the average external air velocity of the two adjacent external air velocities corresponding to the average external air velocity of the target.

[0167] S54. If so, the preset epoxy flange installation position corresponding to the average external air velocity of the target shall be determined as the target epoxy flange installation position.

[0168] S55. If not, select one of the remaining average external air velocities as the target average external air velocity, and jump to the step of determining whether the target average external air velocity is less than the two adjacent average external air velocities corresponding to the target average external air velocity.

[0169] It should be noted that the preset moving sequence is to start the position of the epoxy flange 1 from directly above the stress cone 2, and move it towards the long end copper protective shell 9 of the high-voltage cable intermediate joint at 10mm intervals. The first sequence number is starting directly above the stress cone 2, the second sequence number is moving towards the long end copper protective shell 9 of the high-voltage cable intermediate joint at 10mm intervals, and so on, generating 19 sequences. Each sequence number corresponds to a preset epoxy flange installation position, and each preset epoxy flange installation position corresponds to a simulated average external air velocity after an explosion.

[0170] Select one number from the 19 numbers, and assign the corresponding preset epoxy flange installation position n. x The average external air velocity v after the epoxy flange simulation cracks x The average external air velocity v after the simulated explosion of the epoxy flanges two numbers adjacent to this number. x-1 v x+1 Compare, if v x <v x-1 And v x <v x+1 The average external air velocity v after the epoxy flange simulation cracks. x The corresponding preset epoxy flange installation position n x The optimal installation location is determined. Otherwise, select one number from the remaining 18 numbers and proceed to step S53.

[0171] Please see Figure 8 , Figure 8 This is a structural block diagram of an epoxy flange position optimization system for a high-voltage cable intermediate joint provided in Embodiment 3 of the present invention.

[0172] This invention provides an epoxy flange position optimization system for high-voltage cable intermediate joints, comprising:

[0173] The parameter information module 801 is used to obtain the parameter information corresponding to the received epoxy flange position optimization request in response to the epoxy flange position optimization request.

[0174] The geometric model module 802 is used to determine multiple geometric models of the high-voltage cable intermediate joint based on multiple preset epoxy flange installation positions and structural parameters of the high-voltage cable intermediate joint in the parameter information.

[0175] The target finite element model module 803 is used to extract the material parameters corresponding to each geometric model and construct the target finite element model of multiple high-voltage cable intermediate joints.

[0176] The target high-voltage cable intermediate joint simulation model module 804 is used to input the preset boundary conditions, preset heat source excitation and preset physical field of the high-voltage cable intermediate joint into each target finite element model to generate multiple target high-voltage cable intermediate joint simulation models.

[0177] The external air average velocity module 805 is used to simulate the high-voltage cable intermediate joints corresponding to the preset epoxy flange installation positions through the simulation model of each target high-voltage cable intermediate joint, and generate the external air average velocity after multiple epoxy flanges are simulated to explode.

[0178] The target epoxy flange installation location module 806 is used to determine the installation location of the target epoxy flange based on the average external air velocity after multiple epoxy flanges have been simulated and cracked.

[0179] Optionally, this system also includes:

[0180] The preset epoxy flange installation position submodule is used to move the installation position of epoxy flange 1 according to a preset moving sequence and a preset moving interval, thereby generating multiple preset epoxy flange installation positions.

[0181] The parameter information submodule is used to generate parameter information by using the structural parameters of each preset epoxy flange installation position and the corresponding high-voltage cable intermediate joint.

[0182] Optionally, the geometric model module 802 includes:

[0183] The structural parameter submodule is used to extract the structural parameters of multiple preset epoxy flange installation positions and high-voltage cable intermediate joints from the parameter information.

[0184] The geometric model submodule is used to construct multiple geometric models of high-voltage cable intermediate joints using the installation positions of each preset epoxy flange and the structural parameters of the high-voltage cable intermediate joint.

[0185] Optionally, the target finite element model module 803 includes:

[0186] The initial finite element model submodule is used to extract the material parameters corresponding to each geometric model and construct the initial finite element models corresponding to multiple high-voltage cable intermediate joints.

[0187] The updated finite element model submodule is used to remove the epoxy flange 1 on the high-voltage cable intermediate joint corresponding to each initial finite element model and generate multiple updated finite element models.

[0188] The target finite element model submodule is used to divide the pre-defined area on the overall prefabricated surface directly above the stress cone 2 of the high-voltage cable intermediate joint corresponding to each updated finite element model, and generate multiple target finite element models.

[0189] Optionally, the target high-voltage cable intermediate joint simulation model module 804 includes:

[0190] The initial high-voltage cable intermediate joint simulation model submodule is used to input the preset boundary conditions of the high-voltage cable intermediate joint into each target finite element model to generate multiple initial high-voltage cable intermediate joint simulation models.

[0191] The high-voltage cable intermediate joint simulation model submodule is used to set a preset heat source excitation on the preset area of ​​the high-voltage cable intermediate joint corresponding to each initial high-voltage cable intermediate joint simulation model, and generate multiple updated high-voltage cable intermediate joint simulation models.

[0192] The target high-voltage cable intermediate joint simulation model submodule is used to input the preset physical field into each updated high-voltage cable intermediate joint simulation model to generate multiple target high-voltage cable intermediate joint simulation models.

[0193] Optionally, the simulation model submodule for the target high-voltage cable intermediate joint includes:

[0194] The non-isothermal flow submodule is used to couple laminar flow and fluid heat transfer calculations to generate non-isothermal flow.

[0195] The surface-to-surface radiation heat transfer submodule is used to couple the fluid heat transfer and the surface-to-surface radiation to generate the surface-to-surface radiation heat transfer.

[0196] The preset physics field submodule is used to generate a preset physics field by employing non-isothermal flow and surface-to-surface radiative heat transfer.

[0197] The target high-voltage cable intermediate joint simulation model submodule is used to input the preset physical field into each updated high-voltage cable intermediate joint simulation model to generate multiple target high-voltage cable intermediate joint simulation models.

[0198] Optionally, the external air average velocity module 805 includes:

[0199] The sorting results submodule is used to sort the average external air velocity after each epoxy flange simulates cracking according to a preset moving order and generate sorting results.

[0200] The selection submodule is used to select an average external air velocity from the sorting results as the target average external air velocity.

[0201] The judgment submodule is used to determine whether the average external air velocity of the target is less than the average external air velocity of the two adjacent external air velocities corresponding to the average external air velocity of the target.

[0202] The target epoxy flange installation position submodule is used to determine the preset epoxy flange installation position corresponding to the average external air velocity as the target epoxy flange installation position if the condition is met.

[0203] The jump rotor module is used to select an average external air velocity from the remaining average external air velocities as the target average external air velocity if no, and then jump to execute the step of determining whether the target average external air velocity is less than the two adjacent average external air velocities corresponding to the target average external air velocity.

[0204] Embodiment 4 of the present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program; when the computer program is executed by the processor, the processor performs the steps of the epoxy flange position optimization method for high-voltage cable intermediate joints as described in any of the above embodiments.

[0205] Embodiment 5 of the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, it implements the epoxy flange position optimization method for high-voltage cable intermediate joints as described in any of the above embodiments.

[0206] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0207] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0208] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0209] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0210] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0211] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for optimizing the position of the epoxy flange in a high-voltage cable intermediate joint, characterized in that, include: In response to the received epoxy flange position optimization request, obtain the parameter information corresponding to the epoxy flange position optimization request; Based on the multiple preset epoxy flange installation positions and structural parameters of the high-voltage cable intermediate joint in the parameter information, multiple geometric models of the high-voltage cable intermediate joint are determined. Extracting material parameters corresponding to each geometric model to construct multiple target finite element models of the high-voltage cable intermediate joints; specifically including: extracting material parameters corresponding to each geometric model to construct multiple initial finite element models corresponding to the high-voltage cable intermediate joints; removing epoxy flanges from the high-voltage cable intermediate joints corresponding to each initial finite element model to generate multiple updated finite element models; dividing a preset region on the overall prefabricated structure directly above the stress cone of the high-voltage cable intermediate joints corresponding to each updated finite element model to generate multiple target finite element models; The preset boundary conditions, preset heat source excitation, and preset physical field of the high-voltage cable intermediate joint are respectively input into each of the target finite element models to generate multiple target high-voltage cable intermediate joint simulation models; specifically, this includes: inputting the preset boundary conditions of the high-voltage cable intermediate joint into each of the target finite element models to generate multiple initial high-voltage cable intermediate joint simulation models; setting a preset heat source excitation on a preset region of the high-voltage cable intermediate joint corresponding to each of the initial high-voltage cable intermediate joint simulation models to generate multiple updated high-voltage cable intermediate joint simulation models; and inputting the preset physical field into each of the updated high-voltage cable intermediate joint simulation models to generate multiple target high-voltage cable intermediate joint simulation models. The simulation models of the intermediate joints of the target high-voltage cables are used to simulate the intermediate joints of the high-voltage cables corresponding to the installation positions of the preset epoxy flanges, and the average external air velocity after the simulated explosion of the epoxy flanges is generated. Based on the average external air velocity after multiple simulated explosions of the epoxy flanges, the installation location of the target epoxy flange is determined.

2. The method for optimizing the position of the epoxy flange of a high-voltage cable intermediate joint according to claim 1, characterized in that, Also includes: Based on a preset moving sequence, the installation positions of the epoxy flanges are moved according to preset moving intervals to generate multiple preset epoxy flange installation positions. Parameter information is generated using the structural parameters of the preset epoxy flange installation positions and the corresponding high-voltage cable intermediate joints.

3. The method for optimizing the position of the epoxy flange of a high-voltage cable intermediate joint according to claim 1, characterized in that, The step of determining multiple geometric models of the high-voltage cable intermediate joint based on multiple preset epoxy flange installation positions and structural parameters of the high-voltage cable intermediate joint in the parameter information includes: Extract the structural parameters of multiple preset epoxy flange installation positions and high-voltage cable intermediate joints from the parameter information; Multiple geometric models of the high-voltage cable intermediate joint are constructed using the preset epoxy flange installation positions and the structural parameters of the high-voltage cable intermediate joint.

4. The method for optimizing the position of the epoxy flange of a high-voltage cable intermediate joint according to claim 1, characterized in that, The step of inputting a preset physical field into each of the updated high-voltage cable intermediate joint simulation models to generate multiple target high-voltage cable intermediate joint simulation models includes: By coupling laminar flow and fluid heat transfer calculations, non-isothermal flow is generated. The fluid heat transfer and the surface-to-surface radiation are coupled and calculated to generate surface-to-surface radiative heat transfer. A preset physical field is generated by employing the non-isothermal flow and the surface-to-surface radiative heat transfer. The preset physical fields are input into each of the updated high-voltage cable intermediate joint simulation models to generate multiple target high-voltage cable intermediate joint simulation models.

5. The method for optimizing the position of the epoxy flange of a high-voltage cable intermediate joint according to claim 2, characterized in that, The step of determining the installation location of the target epoxy flange based on the average external air velocity after multiple simulated explosions of the epoxy flanges includes: The average external air velocity after the simulated explosion of each epoxy flange is sorted according to the preset moving order, and a sorting result is generated. Select an average external air velocity from the sorting results as the target average external air velocity; Determine whether the average external air velocity of the target is less than the average external air velocity of the two adjacent external air velocities corresponding to the average external air velocity of the target. If so, the preset epoxy flange installation position corresponding to the average external air velocity of the target is determined as the target epoxy flange installation position; If not, select one of the remaining average external air velocities as the target average external air velocity, and then proceed to the step of determining whether the target average external air velocity is less than the two adjacent average external air velocities corresponding to the target average external air velocity.

6. A system for optimizing the position of an epoxy flange in a high-voltage cable intermediate joint, characterized in that, include: The parameter information module is used to obtain the parameter information corresponding to the received epoxy flange position optimization request in response to the received epoxy flange position optimization request. The geometric model module is used to determine multiple geometric models of the high-voltage cable intermediate joint based on multiple preset epoxy flange installation positions and structural parameters of the high-voltage cable intermediate joint in the parameter information. The target finite element model module is used to extract the material parameters corresponding to each of the geometric models and construct multiple target finite element models of the high-voltage cable intermediate joints; specifically, it includes: extracting the material parameters corresponding to each of the geometric models and constructing multiple initial finite element models corresponding to the high-voltage cable intermediate joints; removing the epoxy flanges on the high-voltage cable intermediate joints corresponding to each of the initial finite element models to generate multiple updated finite element models; dividing a preset area on the overall prefabricated structure directly above the stress cone of the high-voltage cable intermediate joints corresponding to each of the updated finite element models to generate multiple target finite element models; The target high-voltage cable intermediate joint simulation model module is used to input the preset boundary conditions, preset heat source excitation, and preset physical field of the high-voltage cable intermediate joint into each of the target finite element models to generate multiple target high-voltage cable intermediate joint simulation models. Specifically, it includes: inputting the preset boundary conditions of the high-voltage cable intermediate joint into each of the target finite element models to generate multiple initial high-voltage cable intermediate joint simulation models; setting a preset heat source excitation on a preset region of the high-voltage cable intermediate joint corresponding to each of the initial high-voltage cable intermediate joint simulation models to generate multiple updated high-voltage cable intermediate joint simulation models; and inputting the preset physical field into each of the updated high-voltage cable intermediate joint simulation models to generate multiple target high-voltage cable intermediate joint simulation models. The external air average velocity module is used to simulate the high-voltage cable intermediate joints corresponding to the preset epoxy flange installation positions through the simulation models of each target high-voltage cable intermediate joint, and generate the external air average velocity after multiple epoxy flanges are simulated to explode. The target epoxy flange installation location module is used to determine the installation location of the target epoxy flange based on the average external air velocity after multiple epoxy flanges have been simulated to burst.

7. An electronic device, characterized in that, The device includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the epoxy flange position optimization method for high-voltage cable intermediate joints as described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed, it implements the epoxy flange position optimization method for high-voltage cable intermediate joints as described in any one of claims 1-5.

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