A method and device for evaluating moisture-proof performance of an insulation interface of a cable accessory, a terminal device, and a storage medium

Abstract

This invention discloses a method, apparatus, terminal equipment, and storage medium for evaluating the moisture-proof performance of cable accessory insulation interfaces, relating to the field of cable performance evaluation technology. The method includes: obtaining the penetration distance of moisture at the insulation interface of the cable accessory to be evaluated at different times during the experiment, and the average gap of the insulation interface measured after the experiment; establishing a water seepage model of the insulation interface, making rational assumptions and simplifications based on the Navier-Stokes equation, and introducing the capillary effect of the insulation interface to obtain a capillary effect water seepage equation; substituting the penetration distance into the capillary effect water seepage equation to obtain water seepage state characterization parameters; decoupling the water seepage state characterization parameters according to the average gap of the insulation interface to obtain quantitative parameters of the water seepage contact state, thereby determining the moisture-proof performance of the insulation interface. By implementing this invention, the problem that existing technologies cannot quantitatively characterize the ease of moisture penetration along the interface can be solved, and the moisture-proof performance of cable accessory insulation interfaces can be accurately evaluated.

Description

Technical Field

[0001] This invention relates to the field of cable performance evaluation technology, and in particular to a method, apparatus, terminal equipment, and storage medium for evaluating the moisture resistance performance of cable accessory insulation interfaces. Background Technology

[0002] Power cable accessories (including cable joints and terminations) are critical connection components in power transmission and distribution lines and related power distribution equipment. Currently, cable accessory faults caused by interfacial discharge between cross-linked polyethylene (XLPE) and silicone rubber (SiR) insulation occur frequently in power distribution networks, often accompanied by serious accidents such as explosions and fires, posing a significant hazard. According to fault statistics, approximately 80% of power distribution network cable accessories are in a state of prolonged immersion or rainwater intrusion, indicating that moisture at the XLPE-SiR insulation interface is the main cause of interfacial discharge, ultimately leading to breakdown and short-circuit faults.

[0003] However, since the insulation interface of actual cable accessories is not visible, existing studies on water seepage at the insulation interface of cable accessories mostly use sheet-like XLPE-SiR composite structures for simulation experiments. These experiments introduce liquids under different conditions into the interface and qualitatively describe the impact of the liquid on the interface performance through indirect phenomena such as changes in discharge voltage. This approach cannot quantitatively characterize the ease with which water penetrates along the interface, leading to a mismatch between cable accessory selection and actual operating environments. For example, applying the accessory with the best water resistance in experiments to actual high-humidity areas still fails to meet long-term safe operation requirements, resulting in breakdown and other failures. Summary of the Invention

[0004] This invention provides a method, apparatus, terminal equipment, and storage medium for evaluating the moisture-proof performance of cable accessory insulation interfaces. It can solve the problem that existing technologies cannot quantitatively characterize the ease with which moisture penetrates along the interface, and accurately evaluate the moisture-proof performance of cable accessory insulation interfaces.

[0005] An embodiment of the present invention provides a method for evaluating the moisture-proof performance of the insulation interface of cable accessories, comprising: The purpose of this study is to obtain the penetration distance of water at the insulation interface at different times during the water penetration simulation experiment of the cable accessory to be evaluated, and the average gap of the insulation interface after the water penetration simulation experiment. Substituting the penetration distance of water at the insulation interface at different times into the capillary effect seepage equation, the seepage state characterization parameters are obtained by fitting and calculation. The capillary effect seepage equation is determined in the following way: an insulation interface seepage model is established; based on the Navier-Stokes equation, the insulation interface seepage model is rationalized and simplified, and the capillary effect of the insulation interface is introduced to obtain the capillary effect seepage equation of the insulation interface. Based on the average gap at the insulation interface, the parameters characterizing the water seepage state are decoupled to obtain quantitative parameters of the water seepage contact state at the insulation interface. The moisture-proof performance of the insulation interface is determined based on quantitative parameters of the water seepage contact state.

[0006] Furthermore, based on the Navier-Stokes equations, the seepage model at the insulation interface is rationalized and simplified, and the capillary effect at the insulation interface is introduced to obtain the capillary effect seepage equation at the insulation interface, including: Rational assumptions are made for the water seepage model at the insulation interface. These assumptions include: the average gap at the insulation interface is constant, the inlet pressure is constant, the velocity component along the interface thickness direction is ignored, and the inertial force term is ignored. Based on the rationalization assumptions, the Navier-Stokes equations are simplified to obtain the simplified fluid control equations. Static force equilibrium analysis was performed using the capillary effect at the insulating interface to establish the mathematical relationship of the pressure gradient along the interface extension direction. Substituting the mathematical relationship of the pressure gradient into the simplified fluid control equation, we obtain the differential equation of the velocity distribution. By combining the preset no-slip boundary conditions of the wall, the differential equation of velocity distribution is solved to obtain the velocity distribution function at the insulating interface; Integrating the velocity distribution function along the interface thickness direction yields the flow rate expression per unit width, and based on this expression, the average velocity expression at the insulating interface is determined. The average flow velocity expression is used as the propulsion velocity of the seepage front. A seepage dynamic differential equation is established, and the seepage dynamic differential equation is solved by integration in combination with the initial seepage conditions to obtain the capillary effect seepage equation of the insulation interface. The initial seepage condition is: at time 0, the seepage distance of water at the insulation interface is 0.

[0007] Furthermore, the capillary effect seepage equation includes: ; in, This indicates the distance moisture penetrates at the insulation interface. This represents the surface tension coefficient of water. Indicates the dynamic viscosity of water. Indicates the average gap at the insulation interface. Indicates the time of seepage. This represents the cosine value of the contact angle between water and the surface of cross-linked polyethylene insulation material. This represents the cosine value of the contact angle between water and the surface of a silicone rubber insulating material.

[0008] Furthermore, the penetration distance of moisture at the insulation interface at different times was obtained by continuously acquiring and measuring images of the expansion process of the liquid penetration front in the cable accessory to be evaluated using an optical imaging device in the moisture penetration simulation experiment.

[0009] Furthermore, the average gap at the insulation interface was calculated using the mass of the liquid penetrating the interface, the density of water, and the liquid distribution area at the insulation interface. The mass of the liquid penetrating the interface was obtained by the mass difference of the cable accessory to be evaluated before and after the water penetration simulation experiment. The liquid distribution area at the insulation interface was obtained by analyzing the image after the water penetration simulation experiment using image processing software.

[0010] Furthermore, the moisture-proof performance includes: first protection level, second protection level, or third protection level; wherein, the risk of water seepage increases sequentially from first protection level to second protection level and third protection level. Based on quantitative parameters of the water seepage contact state, the moisture-proof performance of the insulation interface is determined, including: Determine whether the quantitative parameter of the seepage contact state is less than the first preset seepage threshold. If the quantitative parameter of the water seepage contact state is less than the first preset water seepage threshold, then the insulation interface is determined to be the first protection level. If the quantitative parameter of the water seepage contact state is greater than or equal to the first preset water seepage threshold, then if the quantitative parameter of the water seepage contact state is less than the second preset water seepage threshold, the insulation interface is determined to be of the second protection level; if the quantitative parameter of the water seepage contact state is greater than or equal to the second preset water seepage threshold, the insulation interface is determined to be of the third protection level; wherein, the first preset water seepage threshold is less than the second preset water seepage threshold.

[0011] Furthermore, after determining the moisture-proof performance of the insulation interface based on quantitative parameters of the water seepage contact state, the following also includes: With the moisture protection performance at the highest level, the cable accessories to be evaluated are determined to be suitable for humid environments; With a moisture protection rating of Level 2, the cable accessory to be evaluated is determined to be suitable for a ventilated environment. With a moisture protection rating of Level 3, the cable accessory to be evaluated is determined to be suitable for a dry environment.

[0012] Based on the above method embodiments, the present invention provides corresponding device embodiments, including: an experimental data acquisition module, a seepage state fitting module, a seepage parameter decoupling module, and a moisture-proof performance evaluation module; The experimental data acquisition module is used to acquire the penetration distance of water at the insulation interface at different times in the water penetration simulation experiment of the cable accessory to be evaluated, as well as the average gap of the insulation interface measured after the water penetration simulation experiment. The seepage state fitting module is used to substitute the seepage distance of water at the insulation interface at different times into the capillary effect seepage equation and fit the calculation to obtain the seepage state characterization parameters. The capillary effect seepage equation is determined in the following way: an insulation interface seepage model is established; based on the Navier-Stokes equation, the insulation interface seepage model is rationalized and simplified, and the capillary effect of the insulation interface is introduced to obtain the capillary effect seepage equation of the insulation interface. The water seepage parameter decoupling module is used to decouple the water seepage state characterization parameters based on the average gap of the insulation interface, and obtain quantitative parameters of the water seepage contact state of the insulation interface. The moisture-proof performance evaluation module is used to determine the moisture-proof performance of the insulation interface based on quantitative parameters of the water seepage contact state.

[0013] Based on the above method embodiments, the present invention provides a corresponding terminal device embodiment, including: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the steps of the method for evaluating the moisture-proof performance of the cable accessory insulation interface as described in the present invention.

[0014] Based on the above method embodiments, the present invention provides a corresponding computer-readable storage medium embodiment, including: a stored computer program, which, when the computer program is running, controls the device where the computer-readable storage medium is located to perform the steps of the method for evaluating the moisture resistance performance of the cable accessory insulation interface as described in the present invention.

[0015] Compared with the prior art, the beneficial effects of this embodiment are as follows: This invention obtains the penetration distance of water at the insulation interface at different times during a water penetration simulation experiment of the cable accessory to be evaluated, as well as the average gap of the insulation interface measured after the water penetration simulation experiment. The water penetration distance directly reflects the migration process of water at the interface, and the average gap of the insulation interface is a structural factor affecting water penetration. Next, the water penetration distance at the insulation interface at different times is substituted into the capillary effect water penetration equation, and the water penetration state characterization parameters are obtained through fitting calculations to quantify the overall water penetration rate at the interface. The capillary effect water penetration equation is determined as follows: an insulation interface water penetration model is established; based on the Navier-Stokes equation, the insulation interface water penetration model is rationalized and simplified, and the capillary effect of the insulation interface is introduced to obtain the capillary effect water penetration equation of the insulation interface, thus constructing a quantitative relationship of water penetration along the interface from a physical perspective.

[0016] Furthermore, based on the average gap at the insulation interface, the parameters characterizing the water penetration state are decoupled. By eliminating the influence of interface structure factors through decoupling, quantitative parameters of the water penetration contact state that reflect only the interface's own water resistance are obtained. This solves the problem that existing technologies cannot quantitatively characterize the ease with which water penetrates along the interface. Finally, based on the quantitative parameters of the water penetration contact state, the moisture-proof performance of the insulation interface is determined, providing a quantifiable basis for selecting cable accessories in different humid environments. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating a method for evaluating the moisture-proof performance of the insulation interface of cable accessories according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of an XLPE-SiR insulation interface composite sample provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an XLPE-SiR insulation interface moisture penetration simulation experimental system provided in an embodiment of the present invention; Figure 4 This is another schematic flowchart of a method for evaluating the moisture-proof performance of the insulation interface of cable accessories provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a moisture-proof performance evaluation device for the insulation interface of cable accessories provided in an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0020] like Figure 1 As shown, in order to address the problem that existing technologies cannot quantitatively characterize the ease with which moisture penetrates along the interface, an embodiment of the present invention provides a method for evaluating the moisture-proof performance of the insulation interface of cable accessories. This method includes at least the following steps: Step S1: Obtain the penetration distance of water at the insulation interface at different times during the water penetration simulation experiment of the cable accessory to be evaluated, and the average gap of the insulation interface measured after the water penetration simulation experiment. For step S1, in order to accurately evaluate the moisture-proof performance of the XLPE-SiR insulation interface of the cable accessories, this invention conducts a moisture penetration simulation experiment based on the capillary effect principle. The moisture penetration behavior of the XLPE-SiR insulation interface is quantitatively characterized through visualization, providing data support for subsequent moisture-proof performance evaluation. The specific process is as follows: First, in the sample preparation stage, XLPE insulation samples and SiR insulation samples are prepared according to the research needs, such as... Figure 2 As shown, a "convex" structure was cut into the bottom of both samples. This "convex" structure guides the subsequently diluted methylene blue solution to penetrate the insulating interface in a directional manner, preventing disordered liquid diffusion and ensuring the controllability of the experimental process. Figure 2 (a) The top view clearly shows that the silicone grease applied to both sides of the combined sample forms an anti-seepage boundary, while the water wading line below the "convex" structure clearly indicates the initial contact position of the tracer liquid, making the liquid penetration path clearer and more controllable.

[0021] It should be noted that the experiment can be set with various variables, including samples with different aging degrees, different silicone grease distribution states at the insulating interface, and different roughness levels on the surface of XLPE samples, in order to comprehensively explore the influence of various factors on the water penetration behavior.

[0022] Pre-prepared XLPE insulation samples and SiR insulation samples are stacked together to form the target insulation interface structure. Figure 2 (b) The side view shows that a clear interface layer was formed after the XLPE insulation sample and the SiR insulation sample were stacked, and the tracer liquid filled the gap between them. The surface tension experienced by the XLPE insulating sample. The surface tension experienced by the SiR insulating sample. These parameters, representing the average gap at the XLPE-SiR insulation interface, provide an intuitive physical basis for subsequent capillary effect analysis.

[0023] Apply silicone grease evenly to both sides of the combined sample to effectively prevent the tracer liquid from leaking to both sides of the insulating interface, ensuring that the penetration process only occurs within the target interface.

[0024] like Figure 3 The diagram shows the structural schematic of the XLPE-SiR insulation interface moisture penetration simulation experimental system of the present invention. The composite sample is placed in the pressure application device, and a selected constant interfacial pressure is applied. In this embodiment, the pressure application device employs a glass plate-spring-screw system. This system precisely controls the spring compression by adjusting the screw's screw insertion depth, thereby applying a stable and adjustable interfacial pressure to the composite sample. The pressure application operation enables the average gap at the insulation interface to be reduced. To maintain stability and ensure consistency between experimental conditions and actual working conditions, the interface stress state of the cable accessories during actual operation is simulated, thus completing the assembly of the entire experimental system.

[0025] After completing the sample assembly and experimental system assembly, the water penetration simulation experiment can be carried out. Immerse the "convex" structure at the lower end of the assembled sample into a container filled with tracer liquid. The tracer liquid can be a diluted methylene blue solution, ensuring that the tracer liquid makes full contact with the "convex" structure of the insulating interface.

[0026] Because both XLPE and SiR materials have good surface hydrophilicity, the contact angle... At angles less than 90°, driven by capillary force, the tracer liquid will spontaneously seep upwards along the insulation interface. This process simulates the penetration behavior of moisture at the insulation interface of cable accessories under actual working conditions, and can truly reflect the actual performance of the interface's moisture-proof performance, providing a reliable experimental basis for subsequent quantitative characterization of the interface's moisture-proof performance.

[0027] While completing the above-mentioned water infiltration simulation experiment, dynamic recording of the infiltration process was carried out simultaneously.

[0028] In a preferred embodiment, the penetration distance of moisture at the insulation interface at different times is obtained by continuously acquiring and measuring images of the expansion process of the liquid penetration front in the cable accessory to be evaluated using an optical imaging device in a moisture penetration simulation experiment.

[0029] In one embodiment of the present invention, an optical imaging device is activated. In this embodiment, a high-speed camera is used to continuously or periodically acquire images of the expansion process of the liquid penetration front until the experiment reaches the preset duration. The process may take hours or until it reaches a stable state during infiltration.

[0030] By precisely capturing the dynamic changes of moisture infiltration through visualization, optical imaging devices can record the evolution of the liquid front's position on the insulating interface over time at high frame rates or with timed triggering, avoiding errors and lags inherent in manual observation. Continuous acquisition of image data not only allows for real-time tracking of the expansion rate of the infiltration front but also captures the subtle influences of interface structure and material properties on infiltration behavior, providing rich and reliable information for subsequent quantitative data analysis.

[0031] After completing the dynamic recording of the seepage process, the data extraction stage begins. This stage converts the image sequences acquired by the optical camera into quantifiable numerical information. Specifically, this involves analyzing the data at different times within a preset time period. The corresponding images were analyzed frame by frame to measure the penetration distance of the liquid front on the insulating interface. These paired time and distance data are then integrated to form a structured dataset. , where subscript This is a sequence index used to distinguish different measurement times and their corresponding infiltration distances. For example, when... hour, This is the first measurement time point. yes The corresponding penetration distance at any given time; when hour, This is the second measurement time point. yes The corresponding infiltration distance at each moment, and so on.

[0032] It should be noted that, in addition to the dynamic process data mentioned above, the average gap at the insulation interface... It is also a key parameter characterizing the XLPE-SiR interface structure of cable accessories. Its magnitude directly affects the capillary-driven penetration behavior and penetration path of moisture at the interface. Therefore, it is necessary to measure the average gap at the insulation interface. Perform precise measurements to more comprehensively evaluate the interface's moisture-proof performance.

[0033] In a preferred embodiment, the average gap at the insulation interface is calculated using the mass of the liquid penetrating the interface, the density of water, and the liquid distribution area at the insulation interface; wherein, the mass of the liquid penetrating the interface is obtained by the mass difference of the cable accessory to be evaluated before and after the water penetration simulation experiment; and the liquid distribution area at the insulation interface is obtained by analyzing the image after the water penetration simulation experiment using image processing software.

[0034] In one embodiment of the present invention, firstly, before the moisture penetration simulation experiment, the insulating sample assembly in a dry state is accurately weighed to obtain the initial mass. After the water penetration simulation experiment, the sample was immediately removed, and any residual external liquid on the surface was wiped dry. It was then weighed again to avoid interference from residual external liquid on the measurement results, thus obtaining the final mass. The mass of the liquid penetrating the interface is obtained by calculating the difference between the two weighing results. ; in, This indicates the mass of the liquid that has penetrated the interface.

[0035] Secondly, after the water infiltration simulation experiment, the acquired images were professionally analyzed using image processing software. In this embodiment, the AutoCAD LI command was used for analysis, which can accurately calculate the geometric properties of selected closed regions in the image. By identifying the distribution boundary of the tracer liquid on the insulating interface, the effective area of ​​the liquid distribution was accurately calculated. This allows us to determine the distribution range of the liquid at the insulating interface.

[0036] Finally, based on the liquid mass at the penetration interface The density of water and the liquid distribution area at the insulating interface The average gap at the insulation interface is calculated using the following formula. : ; in, This indicates the density of water.

[0037] It should be noted that water was used as the tracer liquid in this embodiment for the experiment, and its density... For known fixed parameters, they can be directly substituted into the formula for calculation. However, the moisture-proof performance evaluation method proposed in this invention is not limited to water, but can also be applied to other liquids with known densities. The calculation can be completed simply by substituting the density of the corresponding liquid into the formula, demonstrating good versatility and scalability.

[0038] Step S2: Substitute the penetration distance of water at the insulation interface at different times into the capillary effect seepage equation and fit the calculation to obtain the seepage state characterization parameters; wherein, the capillary effect seepage equation is determined in the following way: establish an insulation interface seepage model; based on the Navier-Stokes equation, make reasonable assumptions and simplifications to the insulation interface seepage model, and introduce the insulation interface capillary effect to obtain the capillary effect seepage equation of the insulation interface. In a preferred embodiment, the capillary effect permeability equation includes: ; in, This indicates the distance moisture penetrates at the insulation interface. This represents the surface tension coefficient of water. Indicates the dynamic viscosity of water. Indicates the average gap at the insulation interface. Indicates the time of seepage. This represents the cosine value of the contact angle between water and the surface of cross-linked polyethylene insulation material. This represents the cosine value of the contact angle between water and the surface of a silicone rubber insulating material.

[0039] For step S2, the moisture penetration data obtained through the moisture penetration simulation experiment is combined with the theoretical model, and the water penetration state characterization parameters are obtained by fitting calculation, thereby realizing the accurate evaluation of the moisture-proof performance of cable accessories.

[0040] Specifically, the penetration distance of moisture at the insulation interface at different times measured in step S1 will be... Corresponding time Substituting into the capillary effect seepage equation In, due to the surface tension coefficient of the liquid and dynamic viscosity For known constants, such as the surface tension coefficient of water Dynamic viscosity of water The parameters characterizing the seepage state can be solved. The value of .

[0041] in, It is the contact angle of water on the surface of cross-linked polyethylene insulation material. It is the contact angle of water on the surface of silicone rubber insulating material, the sum of their cosine values. This directly reflects the combined hydrophilicity of the surfaces of the two insulating materials, that is, the contact state between moisture and the insulation interface. Defined as It is used to characterize the water permeability and contact properties of the interface.

[0042] The solution to the above-mentioned seepage state characterization parameters depends on the constructed capillary effect seepage equation. The derivation process of the capillary effect seepage equation will be explained in detail below: In a preferred embodiment, based on the Navier-Stokes equations, the seepage model at the insulation interface is rationalized and simplified, and the capillary effect at the insulation interface is introduced to obtain the capillary effect seepage equation at the insulation interface, including: Rational assumptions are made for the water seepage model at the insulation interface. These assumptions include: the average gap at the insulation interface is constant, the inlet pressure is constant, the velocity component along the interface thickness direction is ignored, and the inertial force term is ignored. Based on the rationalization assumptions, the Navier-Stokes equations are simplified to obtain the simplified fluid control equations. Static force equilibrium analysis was performed using the capillary effect at the insulating interface to establish the mathematical relationship of the pressure gradient along the interface extension direction. Substituting the mathematical relationship of the pressure gradient into the simplified fluid control equation, we obtain the differential equation of the velocity distribution. By combining the preset no-slip boundary conditions of the wall, the differential equation of velocity distribution is solved to obtain the velocity distribution function at the insulating interface; Integrating the velocity distribution function along the interface thickness direction yields the flow rate expression per unit width, and based on this expression, the average velocity expression at the insulating interface is determined. The average flow velocity expression is used as the propulsion velocity of the seepage front. A seepage dynamic differential equation is established, and the seepage dynamic differential equation is solved by integration in combination with the initial seepage conditions to obtain the capillary effect seepage equation of the insulation interface. The initial seepage condition is: at time 0, the seepage distance of water at the insulation interface is 0.

[0043] In one embodiment of the present invention, for the water seepage process of moisture in the insulation interface of an actual cable joint under capillary effect, a simplified model of the XLPE-SiR insulation interface gap under water seepage is obtained based on the insulation interface structure of the actual cable accessory. In this model, This represents the pressure at the inlet, i.e., the initial pressure of the tracer liquid at the "convex" structure; This indicates that liquid has seeped into the area closest to the inlet. The pressure at the location changes as the penetration distance increases. and These are the capillary forces formed by the liquid on the surfaces of XLPE and SiR insulating materials, respectively. These two forces are the core driving forces propelling the liquid upwards along the interfacial gaps. The average gap at the insulating interface... As a key parameter characterizing the interface structure, its magnitude is closely related to the interface pressure and material surface roughness of the cable joint during actual operation, and directly affects the penetration path and rate of moisture.

[0044] For the above model, the Navier-Stokes equations are used for fluid dynamics analysis. The Navier-Stokes equations are a set of complex partial differential equations describing the laws of fluid motion, and their original form is as follows: ; in, and They represent liquids respectively. Always and Components of directional flow velocity, This indicates the density of the liquid. Indicates pressure. Indicates dynamic viscosity.

[0045] Based on the actual situation, the following idealized assumptions are proposed to reduce model complexity and ensure physical rationality: First, the average gap at the insulation interface is set. A constant value means that the gap remains stable throughout the entire insulation interface state; secondly, the inlet pressure is set. This value is kept constant to ensure a stable driving force for liquid penetration; the thickness along the interface is ignored. directional velocity component, i.e. This allows the liquid to extend only along the interface. Directional flow; finally, since the seepage velocity in the model is extremely slow and the Reynolds number Re < 1, the inertial force term can be ignored, i.e. .

[0046] Based on the rationalization assumptions proposed above, the original Navier-Stokes equations are simplified. Through a series of mathematical derivations and simplifications, the equations are obtained by retaining only the original Navier-Stokes equations. Simplified fluid control equations for directional flow: ; Through the above simplification, the equations focus on the flow characteristics along the interface direction, thus reducing the originally complex description of fluid motion to the key aspects. In terms of directional flow, the difficulty of solving the equations is greatly reduced, avoiding complex calculations caused by multi-directional and multi-factor coupling, while retaining the main physical mechanisms in the capillary seepage process, such as the balance between pressure gradient and fluid viscosity.

[0047] Next, by analyzing the liquid per unit width... Force analysis in the direction shows that the liquid is in The direction is mainly affected by surface tension, which is the tension along the surface of a liquid acting on any boundary due to the imbalance of intermolecular attraction in the liquid surface layer. Under the influence of capillary effect at the insulating interface, different contact angles will be formed when the liquid comes into contact with the insulating interface.

[0048] Liquid per unit width The surface tension in the direction can be expressed by the following formula: ; in, Indicates the liquid per unit width Surface tension in the direction, This represents the surface tension coefficient of a liquid.

[0049] By performing static force balance analysis on the capillary effect at the insulation interface, the lower edge per unit width can be obtained. Force balance equations in the direction: ; in, This represents the capillary driving force determined by the surface wetting properties of the two insulating materials. This represents the resistance generated by the pressure difference, which reaches equilibrium under static conditions.

[0050] Therefore, the mathematical relationship of the pressure gradient along the direction of interface extension can be derived: ; in, This indicates the initial location of the water seepage.

[0051] Substituting the mathematical relationship of the pressure gradient above into the simplified fluid control equation, we obtain the differential equation of velocity distribution: ; The differential equation for velocity distribution describes the velocity distribution at the interface thickness. Direction, flow rate The relationship between the second-order rate of change and the pressure gradient.

[0052] Based on the fluid mechanics no-slip condition for the wall, a no-slip boundary condition is set, i.e., the flow velocity at the upper and lower walls of the interface is 0: ; Next, the differential equation for the velocity distribution is integrated twice to obtain the general solution: ; in, and is the integration constant.

[0053] Boundary conditions hour Substituting into the general solution, we get , Thus, the velocity distribution function is obtained: ; The velocity distribution function describes the velocity distribution at a given seepage location. At this point, the velocity distribution along the thickness direction of the interface exhibits a parabolic shape.

[0054] To obtain the flow rate per unit width Integrating the velocity distribution function along the interface thickness direction yields the flow rate expression per unit width: ; Based on the flow rate expression per unit width, the average flow velocity at the insulation interface is further determined. Expression, i.e., flow Divide by interface thickness : ; Using the average flow velocity as the propulsion velocity of the seepage front, the seepage dynamic differential equation is established: ; Using the method of separation of variables, the seepage dynamic differential equation is rewritten as follows: ; Integrating both sides, we get: ; Combined with initial seepage conditions hour, Substituting into the equation, we obtain the integral constant. Finally, the capillary effect water seepage equation at the insulating interface is obtained: ; This invention, based on the physical phenomenon of capillary effect water seepage and taking into account actual working conditions, proposes reasonable assumptions to simplify the original Navier-Stokes equations, constructing a system that retains only the original Navier-Stokes equations. The fluid control equations for directional flow are presented, focusing on the flow characteristics along the interface direction while preserving the core physical mechanisms. Furthermore, by introducing the capillary effect at the insulating interface through static force equilibrium analysis, the flow rate per unit width of liquid is calculated. The expression for the surface tension in the direction of seepage. Based on the above series of theoretical derivations and equation construction, a capillary effect seepage equation based on the Navier-Stokes equation is finally established. This equation can quantitatively describe the evolution of seepage distance over time.

[0055] Step S3: Based on the average gap of the insulation interface, decouple the water seepage state characterization parameters to obtain quantitative parameters of the water seepage contact state of the insulation interface. For step S3, since the overall water permeation behavior of the insulation interface is strongly influenced by the wettability of the material surface and the geometric gap of the interface, parameter decoupling is required in order to accurately distinguish the contributions of the two.

[0056] Specifically, the average gap at the insulation interface is measured through the moisture penetration simulation experiment in step S1. The result obtained in step S2 Decoupling is performed to separate quantitative parameters of the seepage contact state independent of the geometric gaps. .

[0057] In this invention, quantitative parameters of water seepage contact state are used. It can objectively reflect the inherent tendency of interface materials and their treatment states (such as aging, application of silicone grease, surface roughness, etc.) to allow water to penetrate, providing a reliable quantitative basis for subsequent accurate evaluation of the water penetration characteristics of the insulation interface.

[0058] like Figure 4 The diagram shows another flowchart of the method for evaluating the moisture-proof performance of the insulation interface of cable accessories according to the present invention. The quantitative analysis of water seepage state of the XLPE-SiR insulation interface of cable accessories based on the Navier-Stokes equations is divided into two parallel modules: theoretical modeling and quantitative experiment of water seepage at the insulation interface.

[0059] In the theoretical modeling module, a water seepage model of the XLPE-SiR insulation interface was established. Based on the Navier-Stokes equations, reasonable assumptions were introduced and simplified, and the capillary effect water seepage equation of the insulation interface was derived. And obtain coupling parameters through fitting. ,in, ; In the experimental module, data points are extracted through sample combinations, water infiltration simulation experiments, and dynamic recording of the infiltration process. Liquid distribution area at the insulating interface and the quality of the liquid penetrating the interface The average gap at the XLPE-SiR insulation interface was calculated. Finally, based on the measured average gap at the insulation interface... For coupling parameters Parameter decoupling is performed to separate quantitative parameters of the seepage contact state independent of the geometric gap. This parameter can objectively reflect the inherent tendency of the interface material itself and its treatment state to water penetration, providing a reliable quantitative basis for subsequent accurate evaluation of the water penetration characteristics of the insulation interface.

[0060] Step S4: Determine the moisture-proof performance of the insulation interface based on the quantitative parameters of the water seepage contact state.

[0061] In a preferred embodiment, the moisture-proof performance includes: a first protection level, a second protection level, or a third protection level; wherein the risk of water seepage increases sequentially from the first protection level to the second protection level and the third protection level. Based on quantitative parameters of the water seepage contact state, the moisture-proof performance of the insulation interface is determined, including: Determine whether the quantitative parameter of the seepage contact state is less than the first preset seepage threshold. If the quantitative parameter of the water seepage contact state is less than the first preset water seepage threshold, then the insulation interface is determined to be the first protection level. If the quantitative parameter of the water seepage contact state is greater than or equal to the first preset water seepage threshold, then if the quantitative parameter of the water seepage contact state is less than the second preset water seepage threshold, the insulation interface is determined to be of the second protection level; if the quantitative parameter of the water seepage contact state is greater than or equal to the second preset water seepage threshold, the insulation interface is determined to be of the third protection level; wherein, the first preset water seepage threshold is less than the second preset water seepage threshold.

[0062] For step S4, the quantitative parameters of the seepage contact state obtained in step S3 are used. It can objectively reflect the inherent tendency of the interface material itself and its treatment state to allow water penetration. The higher the value, the easier it is for moisture to penetrate the interface, and the weaker the interface's moisture-proof ability. This parameter can be quantified based on the water penetration contact state. Determine the moisture-proof performance of the insulation interface.

[0063] In this embodiment, the moisture-proof performance is divided into three levels: the first protection level, the second protection level, and the third protection level, and the risk of water seepage increases sequentially among the three levels.

[0064] First, quantitatively parameterize the water seepage contact state and compare it with the first preset water seepage threshold. The specific value of the first preset water seepage threshold can be set according to the actual situation.

[0065] If the quantitatively parameterized water seepage contact state is less than the first preset water seepage threshold, it indicates that the water seepage risk of the insulation interface is relatively low at this time, and the tendency of water infiltration is weak. It can be determined that the insulation interface is of the first protection level. For example, for cable accessories used in ordinary indoor power distribution equipment, when the quantitatively parameterized water seepage contact state is lower than the first preset water seepage threshold, it is determined to be of the first protection level, meaning that the insulation interface of this cable accessory can effectively resist slight water seepage in a humid environment and ensure the normal operation of the equipment.

[0066] If the quantitatively parameterized water seepage contact state is greater than or equal to the first preset water seepage threshold, it is necessary to further compare it with the second preset water seepage threshold. It should be noted that the second preset water seepage threshold should be greater than the first preset water seepage threshold, and the specific value can be set according to the actual situation.

[0067] When the quantitatively parameterized water seepage contact state is less than the second preset water seepage threshold, it indicates that the water seepage risk of the insulation interface has increased. At this time, it is determined that the insulation interface is of the second protection level. Taking the cable accessories supporting outdoor pole-mounted switches as an example, when the quantitatively parameterized water seepage contact state is between the first preset water seepage threshold and the second preset water seepage threshold, it is determined to be of the second protection level, indicating that this cable accessory needs to be used in an environment with ventilation conditions to cope with the medium water seepage risk.

[0068] When the quantitatively parameterized water seepage contact state is greater than or equal to the second preset water seepage threshold, it is determined that the insulation interface is of the third protection level, indicating that the water seepage risk of the insulation interface is relatively high and the tendency of water infiltration is strong. For example, for electrical equipment used in some industrial environments with high humidity and easy water accumulation, if it is detected that the quantitatively parameterized water seepage contact state reaches or exceeds the second preset water seepage threshold, it is determined to be of the third protection level, suggesting that more stringent moisture-proof measures need to be taken or equipment maintenance should be carried out in a timely manner. Otherwise, insulation failure is likely to occur due to water seepage.

[0069] Through the above discrimination, the moisture-proof performance level of the insulation interface can be determined according to different quantitatively parameterized water seepage contact states, which reflects the adaptability of the insulation interface of cable accessories in different humidity environments, provides guidance for subsequent cable selection, equipment deployment scenario planning, and operation and maintenance strategy formulation, and effectively ensures the stable operation of the equipment in the corresponding environment.

[0070] In a preferred embodiment, after determining the moisture-proof performance of the insulation interface based on quantitative parameters of the water penetration contact state, the method further includes: With the moisture protection performance at the highest level, the cable accessories to be evaluated are determined to be suitable for humid environments; With a moisture protection rating of Level 2, the cable accessory to be evaluated is determined to be suitable for a ventilated environment. With a moisture protection rating of Level 3, the cable accessory to be evaluated is determined to be suitable for a dry environment.

[0071] In one embodiment of the present invention, after determining the moisture-proof performance level of the insulation interface based on the quantitative parameters of the water seepage contact state, the corresponding applicable environment is further matched based on the moisture-proof performance level.

[0072] Specifically, when the moisture-proof performance of the insulation interface is at the first protection level, it indicates that its own moisture-proof capability is strong and it can withstand the intrusion of moisture in a high humidity environment. Therefore, it is determined that the cable accessory to be evaluated is suitable for a humid environment. When the moisture-proof performance of the insulation interface is the second protection level, it indicates that its own moisture-proof capability is moderate and it needs to be used under conditions with air circulation and relatively controllable humidity. Therefore, it is determined that the cable accessory to be evaluated is suitable for a ventilated environment. When the moisture protection performance of the insulation interface is at the third protection level, it indicates that its own moisture protection capability is weak. It can only ensure the insulation reliability in environments with low humidity and low risk of water vapor intrusion. Therefore, it is determined that the cable accessories to be evaluated are suitable for dry environments.

[0073] This invention integrates the physical mechanism and experimental quantitative methods of moisture penetration at the XLPE-SiR insulation interface, and proposes a quantitative analysis method for the water penetration state of the XLPE-SiR insulation interface of cable accessories based on the Navier-Stokes equations. This method enables accurate characterization and quantitative evaluation of the water penetration tendency under different insulation interface states, thereby solving the problems of traditional methods being unable to quantitatively characterize the water penetration state of the insulation interface and accurately match the applicable environment. It provides a reliable theoretical and quantitative basis for the selection, deployment, operation and maintenance of cable accessories and the formulation of moisture-proof measures, effectively improving the safety and reliability of power equipment operation.

[0074] like Figure 5 As shown, based on the above method embodiments, corresponding apparatus embodiments are provided; One embodiment of the present invention provides a moisture-proof performance evaluation device for the insulation interface of cable accessories, comprising: an experimental data acquisition module, a water seepage state fitting module, a water seepage parameter decoupling module, and a moisture-proof performance evaluation module; The experimental data acquisition module is used to acquire the penetration distance of water at the insulation interface at different times in the water penetration simulation experiment of the cable accessory to be evaluated, as well as the average gap of the insulation interface measured after the water penetration simulation experiment. The seepage state fitting module is used to substitute the seepage distance of water at the insulation interface at different times into the capillary effect seepage equation and fit the calculation to obtain the seepage state characterization parameters. The capillary effect seepage equation is determined in the following way: an insulation interface seepage model is established; based on the Navier-Stokes equation, the insulation interface seepage model is rationalized and simplified, and the capillary effect of the insulation interface is introduced to obtain the capillary effect seepage equation of the insulation interface. The water seepage parameter decoupling module is used to decouple the water seepage state characterization parameters based on the average gap of the insulation interface, and obtain quantitative parameters of the water seepage contact state of the insulation interface. The moisture-proof performance evaluation module is used to determine the moisture-proof performance of the insulation interface based on quantitative parameters of the water seepage contact state.

[0075] In a preferred embodiment, the seepage state fitting module, based on the Navier-Stokes equations, makes rational assumptions and simplifications to the seepage model of the insulation interface, and introduces the capillary effect of the insulation interface to obtain the capillary effect seepage equation of the insulation interface, including: Rational assumptions are made for the water seepage model at the insulation interface. These assumptions include: the average gap at the insulation interface is constant, the inlet pressure is constant, the velocity component along the interface thickness direction is ignored, and the inertial force term is ignored. Based on the rationalization assumptions, the Navier-Stokes equations are simplified to obtain the simplified fluid control equations. Static force equilibrium analysis was performed using the capillary effect at the insulating interface to establish the mathematical relationship of the pressure gradient along the interface extension direction. Substituting the mathematical relationship of the pressure gradient into the simplified fluid control equation, we obtain the differential equation of the velocity distribution. By combining the preset no-slip boundary conditions of the wall, the differential equation of velocity distribution is solved to obtain the velocity distribution function at the insulating interface; Integrating the velocity distribution function along the interface thickness direction yields the flow rate expression per unit width, and based on this expression, the average velocity expression at the insulating interface is determined. The average flow velocity expression is used as the propulsion velocity of the seepage front. A seepage dynamic differential equation is established, and the seepage dynamic differential equation is solved by integration in combination with the initial seepage conditions to obtain the capillary effect seepage equation of the insulation interface. The initial seepage condition is: at time 0, the seepage distance of water at the insulation interface is 0.

[0076] In a preferred embodiment, the seepage state fitting module, the capillary effect seepage equation, includes: ; in, This indicates the distance moisture penetrates at the insulation interface. This represents the surface tension coefficient of water. Indicates the dynamic viscosity of water. Indicates the average gap at the insulation interface. Indicates the time of seepage. This represents the cosine value of the contact angle between water and the surface of cross-linked polyethylene insulation material. This represents the cosine value of the contact angle between water and the surface of a silicone rubber insulating material.

[0077] In a preferred embodiment, the experimental data acquisition module obtains the penetration distance of moisture at the insulation interface at different times by continuously acquiring and measuring the expansion process of the liquid penetration front in the cable accessory to be evaluated through an optical imaging device in the moisture penetration simulation experiment.

[0078] In a preferred embodiment, the experimental data acquisition module calculates the average gap at the insulation interface using the mass of the liquid penetrating the interface, the density of water, and the liquid distribution area at the insulation interface. The mass of the liquid penetrating the interface is obtained by the mass difference of the cable accessory to be evaluated before and after the water penetration simulation experiment. The liquid distribution area at the insulation interface is obtained by analyzing the image after the water penetration simulation experiment using image processing software.

[0079] In a preferred embodiment, the moisture-proof performance includes: a first protection level, a second protection level, or a third protection level; wherein the risk of water seepage increases sequentially from the first protection level to the second protection level and the third protection level. The moisture-proof performance evaluation module includes: a parameter judgment unit, a first judgment unit, and a second judgment unit; The parameter judgment unit is used to determine whether the quantitative parameter of the seepage contact state is less than the first preset seepage threshold. The first determination unit is used to determine the insulation interface as the first protection level if the quantitative parameter of the water seepage contact state is less than the first preset water seepage threshold. The second determination unit is used to determine the insulation interface as the second protection level if the quantitative parameter of the water seepage contact state is greater than or equal to the first preset water seepage threshold, and if the quantitative parameter of the water seepage contact state is less than the second preset water seepage threshold; and to determine the insulation interface as the third protection level if the quantitative parameter of the water seepage contact state is greater than or equal to the second preset water seepage threshold; wherein the first preset water seepage threshold is less than the second preset water seepage threshold.

[0080] In a preferred embodiment, the moisture-proof performance evaluation device for the insulation interface of cable accessories further includes: an applicable environment classification module; Applicable environment classification modules include: humid environment classification, ventilated environment classification, and dry environment classification; Humidity environment classification is used to determine whether the cable accessories to be evaluated are suitable for humid environments, provided that the moisture protection performance is at the first level of protection. Ventilation environment classification is used to determine the suitability of the cable accessory to be evaluated for a ventilated environment, given that the moisture protection performance is at the second protection level. Dry environment classification is used to determine whether the cable accessory to be evaluated is suitable for a dry environment, given a moisture protection level of 3.

[0081] It is understood that the above-described device embodiments correspond to the method embodiments of the present invention, and can implement the method for evaluating the moisture-proof performance of the cable accessory insulation interface provided by any of the above-described method embodiments of the present invention.

[0082] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can specifically be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0083] Based on the above-described embodiments of the method for evaluating the moisture-proof performance of cable accessory insulation interfaces, another embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the method for evaluating the moisture-proof performance of cable accessory insulation interfaces according to any embodiment of the present invention.

[0084] For example, in this embodiment, the computer program can be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the terminal device.

[0085] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0086] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting various parts of the terminal device via various interfaces and lines.

[0087] Based on the above-described method embodiments, another embodiment is provided: another embodiment of the present invention provides a computer-readable storage medium, including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute the moisture-proof performance evaluation method for the insulation interface of cable accessories as described in any of the above-described method embodiments of the present invention.

[0088] The module / unit integrated into the moisture-proof performance evaluation device / terminal equipment for the cable accessory insulation interface, if implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0089] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for evaluating the moisture-proof performance of the insulation interface of cable accessories, characterized in that, include: The purpose of this study is to obtain the penetration distance of water at the insulation interface at different times during the water penetration simulation experiment of the cable accessory to be evaluated, and the average gap of the insulation interface after the water penetration simulation experiment. Substituting the penetration distance of water at the insulation interface at different times into the capillary effect seepage equation, the seepage state characterization parameters are obtained by fitting and calculation; wherein, the capillary effect seepage equation is determined by the following method: establishing an insulation interface seepage model; based on the Navier-Stokes equation, the insulation interface seepage model is rationalized and simplified, and the capillary effect of the insulation interface is introduced to obtain the capillary effect seepage equation of the insulation interface. Based on the average gap of the insulation interface, the water seepage state characterization parameters are decoupled to obtain quantitative parameters of the water seepage contact state of the insulation interface. The moisture-proof performance of the insulation interface is determined based on quantitative parameters of the water seepage contact state.

2. The method for evaluating the moisture-proof performance of the insulation interface of cable accessories according to claim 1, characterized in that, Based on the Navier-Stokes equations, the seepage model at the insulation interface is rationalized and simplified, and the capillary effect at the insulation interface is introduced to obtain the capillary effect seepage equation at the insulation interface, including: The insulation interface seepage model is subject to rational assumptions, including: the average gap at the insulation interface is constant, the inlet pressure is constant, the velocity component along the interface thickness direction is ignored, and the inertial force term is ignored. Based on the rationalization assumptions, the Navier-Stokes equations are simplified to obtain the simplified fluid control equations. Static force equilibrium analysis was performed using the capillary effect at the insulating interface to establish the mathematical relationship of the pressure gradient along the interface extension direction. Substituting the mathematical relationship of the pressure gradient into the simplified fluid control equation, the differential equation of velocity distribution is obtained; By combining the preset no-slip boundary conditions of the wall, the velocity distribution differential equation is solved to obtain the velocity distribution function at the insulating interface; Integrating the velocity distribution function along the interface thickness direction yields the flow rate expression per unit width, and based on the flow rate expression per unit width, the average velocity expression at the insulating interface is determined. Using the average flow velocity expression as the propulsion velocity of the seepage front, a seepage dynamic differential equation is established. The seepage dynamic differential equation is then solved by integration in conjunction with the initial seepage conditions to obtain the capillary effect seepage equation of the insulation interface. The initial seepage condition is: at time 0, the seepage distance of water at the insulation interface is 0.

3. The method for evaluating the moisture-proof performance of the insulation interface of cable accessories according to claim 1, characterized in that, The capillary effect permeability equation includes: ； in, This indicates the distance moisture penetrates at the insulation interface. This represents the surface tension coefficient of water. Indicates the dynamic viscosity of water. Indicates the average gap at the insulation interface. Indicates the time of seepage. This represents the cosine value of the contact angle between water and the surface of cross-linked polyethylene insulation material. This represents the cosine value of the contact angle between water and the surface of a silicone rubber insulating material.

4. The method for evaluating the moisture-proof performance of the insulation interface of cable accessories according to claim 1, characterized in that, The penetration distance of moisture at the insulation interface at different times was obtained by continuously acquiring and measuring images of the expansion process of the liquid penetration front in the cable accessory to be evaluated using an optical imaging device in the moisture penetration simulation experiment.

5. The method for evaluating the moisture-proof performance of the insulation interface of cable accessories according to claim 1, characterized in that, The average gap at the insulation interface is calculated using the mass of the liquid penetrating the interface, the density of water, and the liquid distribution area at the insulation interface. The mass of the liquid penetrating the interface is obtained by the mass difference of the cable accessory to be evaluated before and after the water penetration simulation experiment. The liquid distribution area at the insulation interface is obtained by analyzing the image after the water penetration simulation experiment using image processing software.

6. The method for evaluating the moisture-proof performance of the insulation interface of cable accessories according to claim 1, characterized in that, The moisture-proof performance includes: a first protection level, a second protection level, or a third protection level; wherein the risk of water seepage increases sequentially from the first protection level to the second protection level and the third protection level. The determination of the moisture-proof performance of the insulation interface based on quantitative parameters of the water seepage contact state includes: Determine whether the quantitative parameter of the seepage contact state is less than a first preset seepage threshold; If the quantitative parameter of the water seepage contact state is less than the first preset water seepage threshold, then the insulation interface is determined to be the first protection level. If the quantitative parameter of the water seepage contact state is greater than or equal to the first preset water seepage threshold, then if the quantitative parameter of the water seepage contact state is less than the second preset water seepage threshold, the insulation interface is determined to be of the second protection level; if the quantitative parameter of the water seepage contact state is greater than or equal to the second preset water seepage threshold, the insulation interface is determined to be of the third protection level; wherein, the first preset water seepage threshold is less than the second preset water seepage threshold.

7. The method for evaluating the moisture-proof performance of the insulation interface of cable accessories according to claim 6, characterized in that, After determining the moisture-proof performance of the insulation interface based on the quantitative parameters of the water seepage contact state, the following also includes: With the moisture protection performance at the highest level, the cable accessories to be evaluated are determined to be suitable for humid environments; With a moisture protection rating of Level 2, the cable accessory to be evaluated is determined to be suitable for a ventilated environment. With a moisture protection rating of Level 3, the cable accessory to be evaluated is determined to be suitable for a dry environment.

8. A device for evaluating the moisture-proof performance of the insulation interface of cable accessories, characterized in that, include: The module includes an experimental data acquisition module, a seepage state fitting module, a seepage parameter decoupling module, and a moisture-proof performance evaluation module. The experimental data acquisition module is used to acquire the penetration distance of water at the insulation interface at different times in the water penetration simulation experiment of the cable accessory to be evaluated, as well as the average gap of the insulation interface measured after the water penetration simulation experiment. The seepage state fitting module is used to substitute the seepage distance of water at the insulation interface at different times into the capillary effect seepage equation and fit and calculate the seepage state characterization parameters. The capillary effect seepage equation is determined by the following method: establishing an insulation interface seepage model; based on the Navier-Stokes equation, making reasonable assumptions and simplifications to the insulation interface seepage model, and introducing the capillary effect of the insulation interface to obtain the capillary effect seepage equation of the insulation interface. The water seepage parameter decoupling module is used to decouple the water seepage state characterization parameters based on the average gap of the insulation interface to obtain quantitative parameters of the water seepage contact state of the insulation interface. The moisture-proof performance evaluation module is used to determine the moisture-proof performance of the insulation interface based on quantitative parameters of the water seepage contact state.

9. A terminal device, characterized in that, The device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the method for evaluating the moisture resistance of the insulation interface of a cable accessory as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform the moisture-proof performance evaluation method for the insulation interface of cable accessories as described in any one of claims 1-7.

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