Evaluation method for dispersibility of conductive carbon black in high-voltage cable semiconductive shielding material

Abstract

The invention discloses a method for evaluating dispersibility of conductive carbon black in a high-voltage cable semi-conductive shielding material, and particularly relates to the technical field of conductive carbon black dispersibility analysis. Comprising the steps of S01, conductive carbon black dispersion performance data acquisition, S02, semiconductive shielding material conductivity management, S03, conductive carbon black dispersion stability evaluation, S04, conductive carbon black dispersion performance comprehensive evaluation, S05, conductive carbon black dispersion process optimization and S06, high-voltage cable semiconductive shielding material conductivity prediction. According to the method, the stability and reliability of the conductivity of the high-voltage cable are evaluated through real-time monitoring and data analysis by calculating the thermal expansion index of the semi-conductive shielding material, identifying the conductive state, calculating the dispersion stability index of the semi-conductive shielding material, identifying the dispersion state, analyzing the dispersion uniformity evaluation coefficient of the conductive carbon black and evaluating the stability and reliability of the conductivity of the high-voltage cable through real-time monitoring and data analysis. Therefore, the conductivity of the cable is improved, and automatic and intelligent management is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of conductive carbon black dispersion analysis, and more particularly to a method for evaluating the dispersion of conductive carbon black in a semi-conductive shielding material for a high-voltage cable. Background Art

[0002] With the acceleration of industrial and urbanization processes, the demand for electricity is increasing, which requires high-voltage cables to have not only efficient power transmission capabilities, but also good safety performance. Conductive carbon black, as an important functional filler, has good conductivity, which enables it to form a continuous conductive network in shielding materials, thereby effectively reducing the volume resistivity of the material.

[0003] Conductive carbon black is a branched aggregate composed of tiny primary particles. These particles have strong aggregation and high oil absorption, which makes it easy for conductive carbon black to form unstable suspended particles during the dispersion process. At the same time, the dispersibility of conductive carbon black is closely related to its particle size. The finer the particle size, the more contact areas, the stronger the cohesion between the particles, and the greater the difficulty of dispersion.

[0004] However, it still has some shortcomings in actual use. For example, the uneven dispersion of conductive carbon black in the semi-conductive shielding material of high-voltage cables will lead to a decrease in the conductivity of the material, affecting the safety performance of the cable. The existing semi-conductive shielding materials of high-voltage cables lack accurate evaluation of the dispersion of conductive carbon black in the semi-conductive shielding materials of high-voltage cables. Existing evaluation methods for the conductive properties of semi-conductive shielding materials for high-voltage cables often rely on traditional testing methods. However, these methods have problems such as complex operation, long time consumption, and lack of intuitive results, which makes it difficult to meet the needs of modern industrial production for efficient and accurate evaluation. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a method for evaluating the dispersibility of conductive carbon black in a semi-conductive shielding material of a high-voltage cable, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for evaluating the dispersibility of conductive carbon black in a semi-conductive shielding material of a high-voltage cable, comprising the following steps: Step S01: Conductive carbon black dispersion performance data collection: used to collect dispersion effect data of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process within the material. The step S01: conductive carbon black dispersion performance data collection includes a semi-conductive shielding material conductive performance data collection sub-step and a conductive carbon black dispersion stability data collection sub-step.

[0007] Step S02: Conductive performance management of semi-conductive shielding materials: Calculate and obtain the thermal expansion index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material.

[0008] Step S03: Conductive carbon black dispersion stability evaluation: Calculate and obtain the semi-conductive shielding material dispersion stability index of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during its dispersion process.

[0009] Step S04: Comprehensive evaluation of conductive carbon black dispersion performance: used to analyze and obtain a conductive carbon black dispersion uniformity evaluation coefficient during the dispersion process of conductive carbon black in the target high-voltage cable semi-conductive shielding material based on the thermal expansion index of the semi-conductive shielding material and the dispersion stability index of the semi-conductive shielding material during the dispersion process of conductive carbon black in the target high-voltage cable semi-conductive shielding material.

[0010] Step S05: Optimization of conductive carbon black dispersion process: including a conductive anomaly identification sub-step and a dispersion efficiency anomaly identification sub-step. The conductive anomaly identification sub-step performs conductive anomaly analysis of the semi-conductive shielding material of the high-voltage cable, and the dispersion efficiency anomaly identification sub-step performs dispersion efficiency anomaly analysis of the conductive carbon black in the semi-conductive shielding material of the high-voltage cable.

[0011] Step S06: Prediction of conductive properties of high-voltage cable semi-conductive shielding materials: Based on the conductive carbon black dispersion uniformity evaluation coefficient of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during its dispersion process within the material, a conductive properties correlation prediction model is established.

[0012] Preferably, the sub-step of collecting the conductive performance data of the semi-conductive shielding material is specifically as follows: The temperature sensor is used to collect the dispersion temperature and the maximum dispersion temperature of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process, which are marked as 、 ; The three-dimensional distribution image of the target high-voltage cable semi-conductive shielding material is obtained by X-ray computed tomography technology. Each voxel in the three-dimensional distribution image is traversed, and the number of voxels belonging to the high-voltage cable semi-conductive shielding material area is counted. The volume of each voxel is multiplied by the volume, and the initial volume and stable volume of the semi-conductive composite material are collected and marked as 、 The carbon black particle filling concentration of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process is collected by scanning electron microscopy and marked as .

[0013] Preferably, the conductive carbon black dispersion stability data collection sub-step is specifically: The average particle size of the carbon black particles in the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material is collected by a laser particle size analyzer and marked as ; Collect the dispersion time, initial speed, and stable speed of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process, and mark them as 、 、 .

[0014] Preferably, the step S02: managing the conductive properties of the semi-conductive shielding material is specifically as follows: Step S41: Calculate the temperature influence of the material volume during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material using the normalized dispersion temperature, the maximum dispersion temperature, the initial volume of the semi-conductive composite material, and the stable volume of the semi-conductive composite material:

[0015] Among them, GT represents the temperature influence law of material volume, Expressed as the dispersion temperature, Expressed as the maximum dispersion temperature, Expressed as the preset dispersion temperature, is represented by the initial volume of the semiconducting composite material, It is expressed as the stable volume of the semiconducting composite material; Step S42: The calculation formula of the thermal expansion index of the semi-conductive shielding material is:

[0016] in, It is expressed as the thermal expansion index of semi-conductive shielding material, GT is expressed as the temperature influence law of material volume, Expressed as carbon black particle filling concentration, It is represented by the preset carbon black particle filling concentration, e is represented by the natural constant, 、 are respectively expressed as the temperature influence law of material volume and the weight factor of carbon black particle filling concentration, and + =1.

[0017] Preferably, the step S03: evaluating the dispersion stability of conductive carbon black is specifically as follows: Step S51: obtaining the actual length of the target high-voltage cable semi-conductive shielding material, marked as L; Step S52: Calculate the conductive carbon black dispersion distance loss during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material through the dispersion time, initial rotation speed, and stable rotation speed:

[0018] in, Expressed as the conductive carbon black dispersion distance loss, Expressed as the dispersion time, is the initial speed, Indicates the stable speed, It is expressed as the rotation speed compensation factor, and L is the actual length of the semi-conductive shielding material of the target high-voltage cable; Step S53: Calculate the dispersion efficiency of the conductive carbon black particles in the target high-voltage cable semi-conductive shielding material during the dispersion process of the conductive carbon black in the material based on the dispersion time and the average particle size of the carbon black particles:

[0019] in, Expressed as the conductive carbon black particle dispersion efficiency, Indicates the preset dispersion time, Expressed as the average particle size of carbon black particles, Expressed as a compensation factor for the average particle size of carbon black particles, Expressed as the density of conductive carbon black; Step S54: The calculation formula of the dispersion stability index of the semi-conductive shielding material is:

[0020] in, Expressed as the dispersion stability index of semi-conductive shielding materials, Expressed as the conductive carbon black dispersion distance loss, Expressed as the preset conductive carbon black dispersion distance loss, Expressed as the conductive carbon black particle dispersion efficiency, Expressed as the preset conductive carbon black particle dispersion efficiency.

[0021] Preferably, the calculation formula of the conductive carbon black dispersion uniformity evaluation coefficient is:

[0022] in, Expressed as the conductive carbon black dispersion uniformity evaluation coefficient, Expressed as the thermal expansion index of semi-conductive shielding materials, Expressed as the dispersion stability index of semi-conductive shielding materials.

[0023] Preferably, the step S05: optimizing the conductive carbon black dispersion process is as follows: Conductive anomaly identification sub-step: setting a standard value for the thermal expansion index of the semi-conductive shielding material, based on the thermal expansion index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material. If the thermal expansion index of the semi-conductive shielding material is greater than the standard value for the thermal expansion index of the semi-conductive shielding material, it indicates that the dispersion of the conductive carbon black in the material is difficult to form an effective conductive network. The target high-voltage cable semi-conductive shielding material is marked as conductive anomaly and the management personnel are notified to perform optimization. Otherwise, it indicates that the dispersion of the conductive carbon black in the material forms an effective conductive network. The target high-voltage cable semi-conductive shielding material is marked as conductive normally. Dispersion efficiency abnormality identification sub-step: set the standard value of the dispersion stability index of the semi-conductive shielding material, based on the dispersion stability index of the semi-conductive shielding material in the target high-voltage cable semi-conductive shielding material during the dispersion process of the conductive carbon black in the material. If the dispersion stability index of the semi-conductive shielding material is less than the standard value of the dispersion stability index of the semi-conductive shielding material, it indicates that the dispersion efficiency of the conductive carbon black in the material is abnormal. The target high-voltage cable semi-conductive shielding material is marked as having abnormal dispersion efficiency of the conductive carbon black in the material, and the management personnel are notified to optimize it. Otherwise, it indicates that the dispersion efficiency of the conductive carbon black in the material is normal.

[0024] Preferably, the step S06: predicting the conductive performance of the semi-conductive shielding material of the high-voltage cable is specifically as follows: Step S81: extracting the conductive carbon black dispersion uniformity evaluation coefficient of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process within the material, and importing it into the conductive performance correlation prediction model; Step S82: The conductivity performance correlation prediction model is:

[0025] in, It is expressed as a conductive performance correlation prediction model, Expressed as the conductive carbon black dispersion uniformity evaluation coefficient, Expressed as a preset conductive carbon black dispersion uniformity evaluation coefficient; Step S003: Obtain the results of the conductivity performance correlation prediction model. , it indicates that the conductive performance of the semi-conductive shielding material of the high-voltage cable is good. , is the acceptable range of conductivity error of the semi-conductive shielding material of the high-voltage cable. If , it indicates that the error in the conductive performance of the semi-conductive shielding material of the high-voltage cable is beyond the acceptable range.

[0026] Technical effects and advantages of the present invention: 1. The present invention provides an evaluation method for the dispersibility of conductive carbon black in a semi-conductive shielding material of a high-voltage cable. The method collects dispersion effect data of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process in the material, calculates the thermal expansion index of the semi-conductive shielding material during the dispersion process in the material according to the conductive performance data of the semi-conductive shielding material collected in the conductive performance data collection sub-step of the semi-conductive shielding material, sets a standard value of the thermal expansion index of the semi-conductive shielding material, and based on the thermal expansion index of the semi-conductive shielding material during the dispersion process in the material of the conductive carbon black in the target high-voltage cable semi-conductive shielding material, if the thermal expansion index of the semi-conductive shielding material is greater than the standard value of the thermal expansion index of the semi-conductive shielding material, it indicates that the dispersion of the conductive carbon black in the material is difficult to form an effective conductive network, and the target high-voltage cable semi-conductive shielding material is marked as abnormally conductive, and the management personnel are notified to optimize. Otherwise, it indicates that the dispersion of the conductive carbon black in the material forms an effective conductive network, and the target high-voltage cable semi-conductive shielding material is marked as normally conductive. , according to the conductive carbon black dispersion stability data collected in the conductive carbon black dispersion stability data collection sub-step, the semi-conductive shielding material dispersion stability index of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process in the material is calculated, and a standard value of the semi-conductive shielding material dispersion stability index is set. Based on the semi-conductive shielding material dispersion stability index of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process in the material, if the semi-conductive shielding material dispersion stability index is less than the standard value of the semi-conductive shielding material dispersion stability index, it indicates that the dispersion efficiency of the conductive carbon black in the material is abnormal, and the target high-voltage cable semi-conductive shielding material is marked as having abnormal dispersion efficiency of the conductive carbon black in the material, and the management personnel are notified to optimize it. Otherwise, it indicates that the dispersion efficiency of the conductive carbon black in the material is normal, and the dispersibility of the conductive carbon black in the high-voltage cable semi-conductive shielding material can be evaluated to ensure the stability and reliability of the conductive performance of the high-voltage cable. Through real-time monitoring and data analysis, the problem of poor dispersion of the conductive carbon black can be quickly discovered, thereby realizing automated and intelligent management; 2. The present invention provides an evaluation method for the dispersion of conductive carbon black in a semi-conductive shielding material of a high-voltage cable. According to the thermal expansion index of the semi-conductive shielding material and the dispersion stability index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material, the conductive carbon black dispersion uniformity evaluation coefficient of the conductive carbon black in the material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material is obtained by analysis. Based on the analysis results of the conductive performance correlation prediction model, if , it indicates that the conductive performance of the semi-conductive shielding material of the high-voltage cable is good. , is the acceptable range of conductivity error of the semi-conductive shielding material of the high-voltage cable. If , it indicates that the error of the conductive performance of the semi-conductive shielding material of the high-voltage cable exceeds the acceptable range. Based on the conductive carbon black dispersion uniformity evaluation coefficient, a conductive performance correlation prediction model is established, which can predict the conductive performance of the semi-conductive shielding material of the high-voltage cable. Through the feedback of the evaluation results, a scientific basis is provided for cable manufacturers to guide them to optimize the production process and further improve the conductive performance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a flow chart of the method for evaluating the dispersion of conductive carbon black in the semi-conductive shielding material of a high-voltage cable according to the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1 As shown, the present invention provides a method for evaluating the dispersion of conductive carbon black in a semi-conductive shielding material of a high-voltage cable, comprising step S01: collecting data on the dispersion performance of conductive carbon black, step S02: managing the conductive performance of the semi-conductive shielding material, step S03: evaluating the dispersion stability of conductive carbon black, step S04: comprehensive evaluation of the dispersion performance of conductive carbon black, step S05: optimizing the conductive carbon black dispersion process, and step S06: predicting the conductive performance of the semi-conductive shielding material of the high-voltage cable.

[0030] The step S01: conductive carbon black dispersion performance data collection is connected with the step S02: semi-conductive shielding material conductive performance management, the step S02: semi-conductive shielding material conductive performance management is connected with the step S03: conductive carbon black dispersion stability evaluation, the step S03: conductive carbon black dispersion stability evaluation is connected with the step S04: conductive carbon black dispersion performance comprehensive evaluation, the step S04: conductive carbon black dispersion performance comprehensive evaluation is connected with the step S05: conductive carbon black dispersion process optimization, the step S05: conductive carbon black dispersion process optimization is connected with the step S06: high-voltage cable semi-conductive shielding material conductive performance prediction.

[0031] The step S01: conductive carbon black dispersion performance data collection: is used to collect dispersion effect data of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process within the material. The step S01: conductive carbon black dispersion performance data collection includes a semi-conductive shielding material conductive performance data collection sub-step and a conductive carbon black dispersion stability data collection sub-step. The dispersion effect data includes the semi-conductive shielding material conductive performance data and the conductive carbon black dispersion stability data, and the data is transmitted to steps S02 and S03.

[0032] In one possible design, the step S01: collecting conductive carbon black dispersion performance data is specifically as follows: The semi-conductive shielding material conductive performance data collection sub-step: collect the dispersion temperature and the maximum dispersion temperature of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process through the temperature sensor, marked as 、 ; The three-dimensional distribution image of the target high-voltage cable semi-conductive shielding material is obtained by X-ray computed tomography technology. Each voxel in the three-dimensional distribution image is traversed, and the number of voxels belonging to the high-voltage cable semi-conductive shielding material area is counted. The volume of each voxel is multiplied by the volume, and the initial volume and stable volume of the semi-conductive composite material are collected and marked as 、 The carbon black particle filling concentration of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process is collected by scanning electron microscopy and marked as ; The conductive carbon black dispersion stability data collection sub-step: using a laser particle size analyzer to collect the average particle size of the conductive carbon black particles in the target high-voltage cable semi-conductive shielding material during the dispersion process, marked as ; Collect the dispersion time, initial speed, and stable speed of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process, and mark them as 、 、 .

[0033] The step S02: management of the conductive properties of semi-conductive shielding materials: is used to receive the dispersion effect data transmitted by the step S01: collection of the conductive carbon black dispersion performance data, and calculate the thermal expansion index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material according to the conductive performance data of the semi-conductive shielding material collected by the semi-conductive shielding material conductive performance data collection sub-step.

[0034] In one possible design, the step S02: managing the conductive properties of the semi-conductive shielding material is specifically as follows: Step S001: Calculate the temperature influence of the material volume during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material by using the normalized dispersion temperature, the maximum dispersion temperature, the initial volume of the semi-conductive composite material, and the stable volume of the semi-conductive composite material:

[0035] Among them, GT represents the temperature influence law of material volume, Expressed as the dispersion temperature, Expressed as the maximum dispersion temperature, Expressed as the preset dispersion temperature, is represented by the initial volume of the semiconducting composite material, It is expressed as the stable volume of the semiconducting composite material; The volume of the semi-conductive shielding material increases with increasing temperature. When the dispersion temperature difference of the conductive carbon black in the semi-conductive shielding material is greater, the volume difference of the semi-conductive shielding material is greater, and the value of the temperature influence law of the material volume is greater. Conversely, the influence of temperature on the material volume is smaller. Step S002: The calculation formula of the thermal expansion index of the semi-conductive shielding material is:

[0036] in, It is expressed as the thermal expansion index of semi-conductive shielding material, GT is expressed as the temperature influence law of material volume, Expressed as carbon black particle filling concentration, It is represented by the preset carbon black particle filling concentration, e is represented by the natural constant, 、 are respectively expressed as the temperature influence law of material volume and the weight factor of carbon black particle filling concentration, and + =1; During the dispersion of conductive carbon black in semi-conductive shielding materials, when the value of the temperature influence law of the material volume is larger, the volume change of the semi-conductive shielding material is larger, resulting in a lower carbon black particle filling concentration, and the thermal expansion index of the semi-conductive shielding material is larger, and it is difficult to form an effective conductive network. Conversely, the smaller the thermal expansion index of the semi-conductive shielding material is, the smaller the volume change of the semi-conductive shielding material is, the higher the carbon black particle filling concentration is, and the better the conductive network performance is.

[0037] The step S03: conductive carbon black dispersion stability evaluation is used to receive the dispersion effect data transmitted in the step S01: conductive carbon black dispersion performance data collection, and calculate the semi-conductive shielding material dispersion stability index of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process of the conductive carbon black in the material based on the conductive carbon black dispersion stability data collection sub-step.

[0038] In one possible design, the step S03: evaluating the dispersion stability of conductive carbon black is specifically as follows: Step S001: obtaining the actual length of the target high-voltage cable semi-conductive shielding material, marked as L; Step S002: Calculate the conductive carbon black dispersion distance loss during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material through the dispersion time, initial rotation speed, and stable rotation speed:

[0039] in, Expressed as the conductive carbon black dispersion distance loss, Expressed as the dispersion time, is the initial speed, Indicates the stable speed, It is expressed as the rotation speed compensation factor, and L is the actual length of the semi-conductive shielding material of the target high-voltage cable; In the process of dispersing the conductive carbon black in the semi-conductive shielding material, when the rotation speed of the conductive carbon black in the material does not meet expectations, the dispersion distance of the conductive carbon black in the material is reduced, and the dispersion of the conductive carbon black in the material is uneven. When the dispersion time of the conductive carbon black in the material does not meet expectations, it also leads to uneven dispersion of the conductive carbon black in the material. The larger the loss value of the conductive carbon black dispersion distance, the smaller the loss value of the conductive carbon black dispersion distance. Conversely, when the rotation speed of the conductive carbon black in the material meets expectations and the dispersion time meets expectations, it indicates that the dispersion distance of the conductive carbon black in the material increases and the conductive carbon black is evenly dispersed in the material. Step S003: Calculate the dispersion efficiency of the conductive carbon black particles in the target high-voltage cable semi-conductive shielding material during the dispersion process of the conductive carbon black in the material based on the dispersion time and the average particle size of the carbon black particles:

[0040] in, Expressed as the conductive carbon black particle dispersion efficiency, Indicates the preset dispersion time, Expressed as the average particle size of carbon black particles, Expressed as a compensation factor for the average particle size of carbon black particles, Expressed as the density of conductive carbon black; In the process of dispersing the conductive carbon black in the semi-conductive shielding material, within the preset dispersion time, the larger the average particle size of the conductive carbon black particles in the material, the worse the dispersion effect in the material, and the smaller the dispersion efficiency value of the conductive carbon black particles; conversely, the smaller the average particle size of the conductive carbon black particles in the material, the better the dispersion effect in the material, and the larger the dispersion efficiency value of the conductive carbon black particles; Step S004: The calculation formula of the dispersion stability index of the semi-conductive shielding material is:

[0041] in, Expressed as the dispersion stability index of semi-conductive shielding materials, Expressed as the conductive carbon black dispersion distance loss, Expressed as the preset conductive carbon black dispersion distance loss, Expressed as the conductive carbon black particle dispersion efficiency, Expressed as the preset conductive carbon black particle dispersion efficiency; In the process of dispersing conductive carbon black in semi-conductive shielding materials, the better the dispersion state of conductive carbon black in the material, the greater the conductive carbon black particle dispersion efficiency value, and the more uniform the dispersion of conductive carbon black in the material, the smaller the conductive carbon black dispersion distance loss value, then the greater the dispersion stability index of the semi-conductive shielding material. Conversely, it indicates that the dispersion state of conductive carbon black in the material is poor and the dispersion is uneven, then the dispersion stability index of the semi-conductive shielding material is smaller.

[0042] The step S04: comprehensive evaluation of the dispersion performance of conductive carbon black: is used to analyze and obtain the conductive carbon black dispersion uniformity evaluation coefficient of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process of the conductive carbon black in the material based on the thermal expansion index of the semi-conductive shielding material and the dispersion stability index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material.

[0043] In one possible design, the calculation formula of the conductive carbon black dispersion uniformity evaluation coefficient is:

[0044] in, Expressed as the conductive carbon black dispersion uniformity evaluation coefficient, Expressed as the thermal expansion index of semi-conductive shielding materials, Expressed as the dispersion stability index of semi-conductive shielding materials; In the process of dispersing conductive carbon black in semi-conductive shielding materials, when the dispersion stability index of the semi-conductive shielding material is larger, the conductive carbon black is dispersed more evenly in the material, and the conductive carbon black dispersion uniformity evaluation coefficient is larger; conversely, the conductive carbon black dispersion uniformity evaluation coefficient is smaller; when the thermal expansion index of the semi-conductive shielding material is smaller, the conductive carbon black is dispersed more evenly in the material, and the conductive carbon black dispersion uniformity evaluation coefficient is larger; conversely, the conductive carbon black dispersion uniformity evaluation coefficient is smaller.

[0045] The step S05: conductive carbon black dispersion process optimization: includes a conductive anomaly identification sub-step and a dispersion efficiency anomaly identification sub-step. The conductive anomaly identification sub-step performs conductive anomaly analysis of the semi-conductive shielding material of the high-voltage cable, and the dispersion efficiency anomaly identification sub-step performs dispersion efficiency anomaly analysis of the conductive carbon black in the semi-conductive shielding material of the high-voltage cable.

[0046] In one possible design, the step S05: optimizing the conductive carbon black dispersion process is specifically as follows: Conductive anomaly identification sub-step: setting a standard value for the thermal expansion index of the semi-conductive shielding material, based on the thermal expansion index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material. If the thermal expansion index of the semi-conductive shielding material is greater than the standard value for the thermal expansion index of the semi-conductive shielding material, it indicates that the dispersion of the conductive carbon black in the material is difficult to form an effective conductive network. The target high-voltage cable semi-conductive shielding material is marked as conductive anomaly and the management personnel are notified to perform optimization. Otherwise, it indicates that the dispersion of the conductive carbon black in the material forms an effective conductive network. The target high-voltage cable semi-conductive shielding material is marked as conductive normally. Dispersion efficiency abnormality identification sub-step: set the standard value of the dispersion stability index of the semi-conductive shielding material, based on the dispersion stability index of the semi-conductive shielding material in the target high-voltage cable semi-conductive shielding material during the dispersion process of the conductive carbon black in the material. If the dispersion stability index of the semi-conductive shielding material is less than the standard value of the dispersion stability index of the semi-conductive shielding material, it indicates that the dispersion efficiency of the conductive carbon black in the material is abnormal. The target high-voltage cable semi-conductive shielding material is marked as having abnormal dispersion efficiency of the conductive carbon black in the material, and the management personnel are notified to optimize it. Otherwise, it indicates that the dispersion efficiency of the conductive carbon black in the material is normal.

[0047] The step S06: predicting the conductive performance of the semi-conductive shielding material of the high-voltage cable: based on the conductive carbon black dispersion uniformity evaluation coefficient of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process within the material, a conductive performance correlation prediction model is established to generate a conclusion on the conductive performance of the semi-conductive shielding material of the high-voltage cable.

[0048] In a possible design, the step S06: predicting the conductive properties of the semi-conductive shielding material of the high-voltage cable is specifically as follows: Step S001: extracting the conductive carbon black dispersion uniformity evaluation coefficient of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process within the material, and importing it into the conductive performance correlation prediction model; Step S002: The conductivity performance correlation prediction model is:

[0049] in, It is expressed as a conductive performance correlation prediction model, Expressed as the conductive carbon black dispersion uniformity evaluation coefficient, Expressed as a preset conductive carbon black dispersion uniformity evaluation coefficient; Step S003: Obtain the results of the conductivity performance correlation prediction model. , it indicates that the conductive performance of the semi-conductive shielding material of the high-voltage cable is good. , is the acceptable range of conductivity error of the semi-conductive shielding material of the high-voltage cable. If , it indicates that the error in the conductive performance of the semi-conductive shielding material of the high-voltage cable is beyond the acceptable range.

[0050] In the present embodiment, it should be specifically explained that the present invention collects dispersion effect data of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process in the material, calculates the thermal expansion index of the semi-conductive shielding material during the dispersion process in the material according to the conductive performance data of the semi-conductive shielding material collected in the conductive performance data collection sub-step of the semi-conductive shielding material, sets a standard value of the thermal expansion index of the semi-conductive shielding material, and based on the thermal expansion index of the semi-conductive shielding material during the dispersion process in the material according to the conductive carbon black in the target high-voltage cable semi-conductive shielding material, if the thermal expansion index of the semi-conductive shielding material is greater than the standard value of the thermal expansion index of the semi-conductive shielding material, it indicates that the dispersion of the conductive carbon black in the material is difficult to form an effective conductive network, and the target high-voltage cable semi-conductive shielding material is marked as conductive abnormality, and the management personnel are notified to optimize. Otherwise, it indicates that the dispersion of the conductive carbon black in the material forms an effective conductive network, and the target high-voltage cable semi-conductive shielding material is marked as conductive normal, and according to the conductive carbon black The conductive carbon black dispersion stability data collection sub-step collects the conductive carbon black dispersion stability data, calculates the semi-conductive shielding material dispersion stability index of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process in the material, sets the standard value of the semi-conductive shielding material dispersion stability index, and based on the semi-conductive shielding material dispersion stability index of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process in the material, if the semi-conductive shielding material dispersion stability index is less than the standard value of the semi-conductive shielding material dispersion stability index, it indicates that the dispersion efficiency of the conductive carbon black in the material is abnormal, and the target high-voltage cable semi-conductive shielding material is marked as having abnormal conductive carbon black dispersion efficiency in the material, and the management personnel are notified to optimize it. Otherwise, it indicates that the dispersion efficiency of the conductive carbon black in the material is normal, and the dispersibility of the conductive carbon black in the high-voltage cable semi-conductive shielding material can be evaluated to ensure the stability and reliability of the conductive performance of the high-voltage cable. Through real-time monitoring and data analysis, the problem of poor conductive carbon black dispersion can be quickly discovered, thereby realizing automated and intelligent management; The present invention analyzes the conductive carbon black dispersion uniformity evaluation coefficient of the target high-voltage cable semi-conductive shielding material according to the thermal expansion index of the semi-conductive shielding material and the dispersion stability index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the material. Based on the analysis results of the conductive performance correlation prediction model, if , it indicates that the conductive performance of the semi-conductive shielding material of the high-voltage cable is good. , is the acceptable range of conductivity error of the semi-conductive shielding material of the high-voltage cable. If , it indicates that the error of the conductive performance of the semi-conductive shielding material of the high-voltage cable exceeds the acceptable range. Based on the conductive carbon black dispersion uniformity evaluation coefficient, a conductive performance correlation prediction model is established, which can predict the conductive performance of the semi-conductive shielding material of the high-voltage cable. Through the feedback of the evaluation results, a scientific basis is provided for cable manufacturers to guide them to optimize the production process and further improve the conductive performance of the cable.

[0051] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for evaluating the dispersion of conductive carbon black in a semi-conductive shielding material for a high-voltage cable, characterized in that: include: Step S01: Conductive carbon black dispersion performance data collection: used to collect dispersion effect data of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process within the material. Step S01: Conductive carbon black dispersion performance data collection includes a sub-step of collecting the conductive performance data of the semi-conductive shielding material and a sub-step of collecting the conductive carbon black dispersion stability data; Step S02: Conductive performance management of the semi-conductive shielding material: calculating and obtaining the thermal expansion index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material; Step S03: Conductive carbon black dispersion stability evaluation: calculating and obtaining a dispersion stability index of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process within the material; Step S04: Comprehensive evaluation of conductive carbon black dispersion performance: used to analyze and obtain a conductive carbon black dispersion uniformity evaluation coefficient during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material based on the thermal expansion index and dispersion stability index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material; Step S05: Conductive carbon black dispersion process optimization: including a conductivity anomaly identification sub-step and a dispersion efficiency anomaly identification sub-step. The conductivity anomaly identification sub-step performs conductivity anomaly analysis on the semi-conductive shielding material of the high-voltage cable, and the dispersion efficiency anomaly identification sub-step performs dispersion efficiency anomaly analysis on the conductive carbon black in the semi-conductive shielding material of the high-voltage cable. Step S06: Prediction of conductive properties of high-voltage cable semi-conductive shielding materials: Based on the conductive carbon black dispersion uniformity evaluation coefficient of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during its dispersion process within the material, a conductive properties correlation prediction model is established.

2. The method for evaluating the dispersibility of conductive carbon black in a semi-conductive shielding material for a high-voltage cable according to claim 1, wherein: The sub-step of collecting the conductive performance data of the semi-conductive shielding material is specifically as follows: The temperature sensor is used to collect the dispersion temperature and the maximum dispersion temperature of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process, which are marked as 、 ; The three-dimensional distribution image of the target high-voltage cable semi-conductive shielding material is obtained by X-ray computed tomography technology. Each voxel in the three-dimensional distribution image is traversed, and the number of voxels belonging to the high-voltage cable semi-conductive shielding material area is counted. The volume of each voxel is multiplied by the volume, and the initial volume and stable volume of the semi-conductive composite material are collected and marked as 、 The carbon black particle filling concentration of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process is collected by scanning electron microscopy and marked as .

3. The method for evaluating the dispersibility of conductive carbon black in a semi-conductive shielding material for a high-voltage cable according to claim 1, wherein: The conductive carbon black dispersion stability data collection sub-step is specifically as follows: The average particle size of the carbon black particles in the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material is collected by a laser particle size analyzer and marked as ; Collect the dispersion time, initial speed, and stable speed of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process, and mark them as 、 、 .

4. The method for evaluating the dispersibility of conductive carbon black in a semi-conductive shielding material for a high-voltage cable according to claim 1, wherein: The step S02: managing the conductive properties of the semi-conductive shielding material is specifically as follows: Step S41: Calculate the temperature influence of the material volume during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material using the normalized dispersion temperature, the maximum dispersion temperature, the initial volume of the semi-conductive composite material, and the stable volume of the semi-conductive composite material: Among them, GT represents the temperature influence law of material volume, Expressed as the dispersion temperature, Expressed as the maximum dispersion temperature, Expressed as the preset dispersion temperature, is represented by the initial volume of the semiconducting composite material, It is expressed as the stable volume of the semiconducting composite material; Step S42: The calculation formula of the thermal expansion index of the semi-conductive shielding material is: in, It is expressed as the thermal expansion index of semi-conductive shielding material, GT is expressed as the temperature influence law of material volume, Expressed as carbon black particle filling concentration, It is represented by the preset carbon black particle filling concentration, e is represented by the natural constant, 、 are respectively expressed as the temperature influence law of material volume and the weight factor of carbon black particle filling concentration, and + =1.

5. The method for evaluating the dispersibility of conductive carbon black in a semi-conductive shielding material for a high-voltage cable according to claim 1, wherein: The step S03: evaluating the dispersion stability of conductive carbon black is specifically as follows: Step S51: obtaining the actual length of the target high-voltage cable semi-conductive shielding material, marked as L; Step S52: Calculate the conductive carbon black dispersion distance loss during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material through the dispersion time, initial rotation speed, and stable rotation speed: in, Expressed as the conductive carbon black dispersion distance loss, Expressed as the dispersion time, is the initial speed, Indicates the stable speed, It is expressed as the rotation speed compensation factor, and L is the actual length of the semi-conductive shielding material of the target high-voltage cable; Step S53: Calculate the dispersion efficiency of the conductive carbon black particles in the target high-voltage cable semi-conductive shielding material during the dispersion process of the conductive carbon black in the material based on the dispersion time and the average particle size of the carbon black particles: in, Expressed as the conductive carbon black particle dispersion efficiency, Indicates the preset dispersion time, Expressed as the average particle size of carbon black particles, Expressed as a compensation factor for the average particle size of carbon black particles, Expressed as the density of conductive carbon black; Step S54: The calculation formula of the dispersion stability index of the semi-conductive shielding material is: in, Expressed as the dispersion stability index of semi-conductive shielding materials, Expressed as the conductive carbon black dispersion distance loss, Expressed as the preset conductive carbon black dispersion distance loss, Expressed as the conductive carbon black particle dispersion efficiency, Expressed as the preset conductive carbon black particle dispersion efficiency.

6. The method for evaluating the dispersibility of conductive carbon black in a semi-conductive shielding material for a high-voltage cable according to claim 1, wherein: The calculation formula of the conductive carbon black dispersion uniformity evaluation coefficient is: in, Expressed as the conductive carbon black dispersion uniformity evaluation coefficient, Expressed as the thermal expansion index of semi-conductive shielding materials, Expressed as the dispersion stability index of semi-conductive shielding materials.

7. The method for evaluating the dispersibility of conductive carbon black in a semi-conductive shielding material for a high-voltage cable according to claim 1, wherein: The step S05: Optimizing the conductive carbon black dispersion process is specifically as follows: Conductive anomaly identification sub-step: setting a standard value for the thermal expansion index of the semi-conductive shielding material, based on the thermal expansion index of the semi-conductive shielding material during the dispersion process of the conductive carbon black in the target high-voltage cable semi-conductive shielding material. If the thermal expansion index of the semi-conductive shielding material is greater than the standard value for the thermal expansion index of the semi-conductive shielding material, it indicates that the dispersion of the conductive carbon black in the material is difficult to form an effective conductive network. The target high-voltage cable semi-conductive shielding material is marked as conductive anomaly and the management personnel are notified to perform optimization. Otherwise, it indicates that the dispersion of the conductive carbon black in the material forms an effective conductive network. The target high-voltage cable semi-conductive shielding material is marked as conductive normally. Dispersion efficiency abnormality identification sub-step: set the standard value of the dispersion stability index of the semi-conductive shielding material, based on the dispersion stability index of the semi-conductive shielding material in the target high-voltage cable semi-conductive shielding material during the dispersion process of the conductive carbon black in the material. If the dispersion stability index of the semi-conductive shielding material is less than the standard value of the dispersion stability index of the semi-conductive shielding material, it indicates that the dispersion efficiency of the conductive carbon black in the material is abnormal. The target high-voltage cable semi-conductive shielding material is marked as having abnormal dispersion efficiency of the conductive carbon black in the material, and the management personnel are notified to optimize it. Otherwise, it indicates that the dispersion efficiency of the conductive carbon black in the material is normal.

8. The method for evaluating the dispersibility of conductive carbon black in a semi-conductive shielding material for a high-voltage cable according to claim 1, wherein: The step S06: predicting the conductive performance of the semi-conductive shielding material of the high-voltage cable is specifically as follows: Step S81: extracting the conductive carbon black dispersion uniformity evaluation coefficient of the conductive carbon black in the target high-voltage cable semi-conductive shielding material during the dispersion process within the material, and importing it into the conductive performance correlation prediction model; Step S82: The conductivity performance correlation prediction model is: in, It is expressed as a conductive performance correlation prediction model, Expressed as the conductive carbon black dispersion uniformity evaluation coefficient, Expressed as a preset conductive carbon black dispersion uniformity evaluation coefficient; Step S83: Obtain the results of the conductivity performance correlation prediction model. , it indicates that the conductive performance of the semi-conductive shielding material of the high-voltage cable is good. , is the acceptable range of conductivity error of the semi-conductive shielding material of the high-voltage cable. If , it indicates that the error in the conductive performance of the semi-conductive shielding material of the high-voltage cable is beyond the acceptable range.

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