A method for testing the crosslinking performance of cable materials and a method for manufacturing high-voltage cables.

Abstract

This application relates to a method for testing the crosslinking performance of cable materials and a method for manufacturing high-voltage cables. The method includes: placing the cable material to be tested in a differential scanning calorimeter for heating, and acquiring a first relationship curve showing the exothermic rate of the cable material as a function of temperature during the heating process; based on the first relationship curve, determining a second relationship curve showing the degree of curing of the cable material as a function of temperature; based on the second relationship curve, determining a third relationship curve showing the difference between the first and second natural logarithms and their target multiples as a function of the reciprocal of temperature; determining the slope of the third relationship curve, and based on the slope, determining the activation energy of the crosslinking reaction of the cable material to be tested. This method can quickly determine the activation energy of the crosslinking reaction of different cable materials, thereby setting the crosslinking temperature accordingly, thus improving the extrusion efficiency and cable quality of the cable.

Description

Technical Field

[0001] This application relates to the field of cable technology, and in particular to a method for testing the crosslinking performance of cable materials and a method for manufacturing high-voltage cables. Background Technology

[0002] The insulation performance of high-voltage direct current (HVDC) cables is crucial. Their manufacturing typically employs a peroxide chemical cross-linking method, transforming linear polyethylene into a three-dimensional network structure of cross-linked polyethylene (XLPE). During this process, the cross-linking reaction of the cable insulation and shielding materials, and the final cross-linked network structure, are key to the reliable operation of the cable. The main factors affecting the cross-linking process include: the inherent properties of the cable material itself, such as the type and content of the cross-linking agent (peroxide); and the process parameters during cable manufacturing, particularly the temperature and time settings within the cross-linking pipeline.

[0003] Currently, some technologies involve calculating the activation energy of material curing or crosslinking reactions. For example, some traditional technologies have explored improved methods for calculating activation energy based on the aging behavior of epoxy materials, but these differ fundamentally from the chemical crosslinking reactions in cable materials during manufacturing in terms of mechanism and application scenarios. Other traditional technologies have explored the crosslinking kinetics of low-density polyethylene and provided formulas for calculating the activation energy of crosslinking reactions, but this research remains at the theoretical level in the laboratory. Therefore, there is an urgent need for a method that can quickly and accurately test the crosslinking performance of cable materials during actual high-voltage cable manufacturing. Summary of the Invention

[0004] Therefore, it is necessary to provide a method for testing the crosslinking performance of cable materials and a method for manufacturing high-voltage cables that can quickly determine the activation energy of crosslinking reaction of different cable materials, and then set the crosslinking temperature accordingly, thereby improving the extrusion efficiency and cabling quality of the cable.

[0005] In a first aspect, this application provides a method for testing the crosslinking performance of cable materials, including:

[0006] The cable material to be tested was placed in a differential scanning calorimeter for heating, and the first relationship curve of the heat release rate of the cable material to be tested as a function of temperature was obtained during the heating process.

[0007] Based on the first relationship curve, a second relationship curve is determined for the degree of curing of the cable material under test as a function of temperature.

[0008] Based on the second relationship curve, a third relationship curve is determined to show how the difference between the target multiples of the first and second natural logarithms changes with the reciprocal of temperature. The first natural logarithm includes the natural logarithm of the rate of change of the degree of curing with temperature, and the second natural logarithm includes the natural logarithm of the complement of the degree of curing with respect to the target value.

[0009] The slope of the third relationship curve is determined, and based on the slope, the activation energy of the crosslinking reaction of the cable material to be tested is determined.

[0010] In one embodiment, determining the crosslinking activation energy of the cable material under test based on the slope includes:

[0011] The activation energy of the crosslinking reaction of the cable material under test is determined based on the negative of the product of the slope and the gas constant.

[0012] In one embodiment, the relationship between the crosslinking activation energy and the degree of cure includes:

[0013] ;

[0014] in, Indicates degree of cure, T represents temperature, k0 represents reaction rate, and E represents temperature. a The value represents the activation energy of the cross-linking reaction, R represents the gas constant, and n represents the order of the cross-linking reaction. This indicates the rate of temperature increase.

[0015] In one embodiment, determining the second relationship curve of the degree of curing of the cable material under test as a function of temperature based on the first relationship curve includes:

[0016] Based on the first relationship curve, the total reaction enthalpy during the heating process and the heat release at different temperatures are determined.

[0017] Based on the ratio of the exothermic reaction to the total enthalpy of the reaction at different temperatures, a second relationship curve of the degree of curing of the cable material under test as a function of temperature is determined.

[0018] In one embodiment, determining the total enthalpy of the reaction during the heating process based on the first relationship curve includes:

[0019] The total enthalpy of the reaction during the heating process is determined based on the peak area of ​​the exothermic peak in the first relationship curve.

[0020] In one embodiment, determining the exothermic reaction at different temperatures during the heating process based on the first relationship curve includes:

[0021] Based on the integral area of ​​the exothermic peak in the first relationship curve, the exothermic reaction at different temperatures during the heating process is determined.

[0022] In one embodiment, determining the third relationship curve, based on the second relationship curve, of the difference between the target multiples of the first natural logarithm and the second natural logarithm as a function of the reciprocal of temperature includes:

[0023] Based on the second relationship curve, determine the first natural logarithm of the rate of change of the degree of curing with temperature corresponding to multiple target temperatures and the second natural logarithm of the complement of the degree of curing with respect to the target value;

[0024] Calculate the difference between the first natural logarithm value and the second natural logarithm value corresponding to the plurality of target temperatures, and fit a third relationship curve based on the difference between the target multiples of the first natural logarithm and the second natural logarithm as a function of the reciprocal of temperature.

[0025] Secondly, this application also provides a high-voltage cable manufacturing method for manufacturing a high-voltage cable based on the test cable material described in any one of the above claims, the method comprising:

[0026] Based on the activation energy of the crosslinking reaction, the crosslinking temperature for manufacturing high-voltage cables from the test cable material at different extrusion speeds is determined, and the highest value of the crosslinking temperature is positively correlated with the activation energy of the crosslinking reaction.

[0027] In one embodiment, the maximum value of the crosslinking temperature is positively correlated with the extrusion rate.

[0028] In one embodiment, the relationship between the crosslinking temperature and the activation energy of the crosslinking reaction includes:

[0029] ;

[0030] Where k represents the extrusion speed, E a T represents the activation energy of the cross-linking reaction, R represents the gas constant, and T represents the activation energy of the cross-linking reaction. j This represents the crosslinking temperature, where a and b are constants.

[0031] The aforementioned method for testing the crosslinking performance of cable materials and the method for manufacturing high-voltage cables utilize a differential scanning calorimeter to obtain the curve of the cable material's heat release rate changing with temperature, and then converts it into the curve of the cable material's degree of curing changing with temperature. This transforms the problem of calculating the activation energy of the crosslinking reaction into a mathematical analytical problem of the rate of change of the degree of curing with temperature, avoiding the complexity of calculating the relationship between the degree of curing and time in traditional methods. This allows the activation energy of different cable materials to be obtained through simple experimental testing and rapid calculation. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments of this application or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a flowchart illustrating a method for testing the crosslinking performance of cable materials in one embodiment;

[0034] Figure 2 This is a flowchart illustrating step S120 in one embodiment;

[0035] Figure 3 This is a flowchart illustrating step S201 in one embodiment;

[0036] Figure 4 This is a flowchart illustrating step S130 in one embodiment;

[0037] Figure 5 This is a flowchart illustrating a high-voltage cable manufacturing method in one embodiment;

[0038] Figure 6 This is a schematic diagram of the first relationship curve in one embodiment;

[0039] Figure 7 This is a schematic diagram of the second relationship curve in one embodiment;

[0040] Figure 8 This is a schematic diagram illustrating the rate of change of curing degree with temperature in one embodiment;

[0041] Figure 9 This is a schematic diagram of the first relationship curve in another embodiment;

[0042] Figure 10 This is a schematic diagram of the second relationship curve in another embodiment;

[0043] Figure 11 This is a schematic diagram illustrating the rate of change of curing degree with temperature in another embodiment;

[0044] Figure 12 This is a diagram of the internal structure of an electronic device in one embodiment. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0046] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0047] While traditional techniques exist for calculating the activation energy of crosslinking reactions, they typically consider the relationship between the degree of curing and time, making actual calculations quite complex.

[0048] Based on this, embodiments of this application provide a method for testing the crosslinking performance of cable materials, such as... Figure 1 As shown, the procedure includes steps S110 to S140. Wherein:

[0049] Step S110: Place the cable material to be tested in a differential scanning calorimeter for heating, and obtain the first relationship curve of the heat release rate of the cable material to be tested as a function of temperature during the heating process.

[0050] Differential scanning calorimetry (DSC) is a thermal analysis method, and the curve recorded by the DSC instrument can be called a DSC curve. The first relationship curve can include the DSC curve, with temperature (in K) on the x-axis and heat flow rate (in W / g) on ​​the y-axis. During the heating process, the cable material under test undergoes a heat flow change due to the cross-linking reaction, forming an exothermic peak on the first relationship curve. The starting temperature of the peak represents the beginning of the cross-linking reaction, the peak temperature represents the moment when the reaction is fastest, and the ending temperature of the peak represents the point where the reaction is essentially complete.

[0051] For example, a preset mass of uncrosslinked cable material to be tested can be placed in a differential scanning calorimeter and heated from a first preset temperature to a second preset temperature at a preset heating rate under a nitrogen atmosphere. Specifically, the preset mass can be between 5g and 20g. The preset heating rate can be between 5K / min and 20K / min. The first preset temperature can be 50°C. The second preset temperature can be 250°C.

[0052] Step S120: Based on the first relationship curve, determine the second relationship curve of the degree of curing of the cable material to be tested as a function of temperature.

[0053] Among them, degree of curing It is a dimensionless parameter, ranging from 0 to 1 (or 0% to 100%). =0 indicates that the material is completely uncrosslinked; =1 indicates that the material is fully cross-linked. During the heating process, It increases with increasing temperature.

[0054] For example, the first relationship curve of the exothermic rate versus temperature can be converted into a second relationship curve of the degree of curing versus temperature by means of integral method or model fitting method.

[0055] Step S130: Based on the second relationship curve, determine a third relationship curve showing how the difference between the target multiples of the first and second natural logarithms changes with the reciprocal of temperature. The first natural logarithm includes the natural logarithm of the rate of change of curing degree with temperature, and the second natural logarithm includes the natural logarithm of the complement of curing degree with respect to the target value.

[0056] The first natural logarithm can be expressed as: In one possible implementation, differentiating the second relationship curve of curing degree as a function of temperature yields the following result. The relationship curve with temperature T is used to determine the third relationship curve, which is derived from this curve and the second relationship curve. The target value can be 1, and the complement of the degree of cure with respect to the target value is the difference between 1 and the degree of cure. The target multiple of the second natural logarithm can be expressed as... Here, n is the target multiple, representing the order of the crosslinking reaction. Assuming the crosslinking reaction (e.g., the non-isothermal crosslinking reaction of DCP crosslinked polyethylene) is a first-order reaction, n=1, then the difference between the first and second natural logarithms can be expressed as: - The reciprocal of temperature can be expressed as... .

[0057] Here, the first natural logarithm can characterize the reaction rate driven by temperature change, and the target multiple of the second natural logarithm can characterize the logarithm of the remaining reactant concentration, reflecting the effect of the reaction process on the rate.

[0058] Step S140: Determine the slope of the third relationship curve, and based on the slope, determine the activation energy of the crosslinking reaction of the cable material to be tested.

[0059] The slope of the third relationship curve characterizes the rate at which the difference between the target multiples of the first and second natural logarithms changes with the reciprocal of temperature. A linear fit can be performed on the third relationship curve to obtain a straight line. The slope of the third relationship curve is related to the activation energy of the crosslinking reaction of the cable material under test, which can be determined based on the crosslinking reaction kinetic formula and the Arrhenius equation. Furthermore, in this process, through… The relationship between degree of cure and time is converted to the relationship between degree of cure and temperature. Here... Indicates degree of curing. The heating rate is represented by T, and the temperature is represented by T.

[0060] The above-mentioned method for testing the crosslinking performance of cable materials uses a differential scanning calorimeter to obtain the curve of the cable material's heat release rate changing with temperature, and then converts it into the curve of the cable material's degree of curing changing with temperature. This transforms the problem of calculating the activation energy of the crosslinking reaction into a mathematical analytical problem of the rate of change of the degree of curing with temperature, avoiding the complexity of calculating the relationship between the degree of curing and time in traditional methods. This allows the activation energy of different cable materials to be obtained through simple experimental testing and rapid calculation.

[0061] In some embodiments, the step of determining the crosslinking activation energy of the cable material under test based on the slope may include: determining the crosslinking activation energy of the cable material under test based on the negative of the product of the slope and the gas constant.

[0062] For example, the third relationship curve can be represented as:

[0063] (1)

[0064] in, R represents the activation energy of the cross-linking reaction, and R represents the gas constant. This represents a constant related to the reaction rate and the heating rate.

[0065] Understandably, the target multiple n can be 1. In this case, the third relationship curve includes the relationship curve of the difference between the first and second natural logarithms as a function of the reciprocal of temperature.

[0066] In some embodiments, the relationship between the crosslinking activation energy and the degree of curing may include:

[0067] (2)

[0068] in, Indicates degree of cure, T represents temperature, k0 represents reaction rate, and E represents temperature. a The value represents the activation energy of the cross-linking reaction, R represents the gas constant, and n represents the order of the cross-linking reaction. This indicates the rate of temperature increase.

[0069] The reaction kinetics of peroxide-crosslinked polyethylene under non-isothermal conditions are as follows:

[0070] (3)

[0071] in, The cross-linking reaction rate, Let α be the reaction rate constant, α be the percentage of uncrosslinked reactive radicals (degree of cure), and n be the reaction order. To determine the reaction time, taking the logarithmic coordinates of both sides of equation (3) yields:

[0072] (4)

[0073] Furthermore, and Arrhenius formula Substituting into formula (4), we can obtain the relationship between the activation energy of the crosslinking reaction and the degree of curing shown in formula (2). Assuming that the non-isothermal crosslinking reaction of DCP crosslinked polyethylene is a first-order reaction, i.e., n=1, formula (2) can be simplified to:

[0074] (5)

[0075] Therefore, with Using the vertical axis as the ordinate, with Plotting the third relationship curve on the x-axis, the slope of the curve can be used to calculate the value of the activation energy Ea of the cross-linking reaction.

[0076] In some embodiments, such as Figure 2 As shown, step S120 above may include:

[0077] Step S201: Based on the first relationship curve, determine the total reaction enthalpy during the heating process and the heat release of the reaction at different temperatures.

[0078] Step S202: Based on the ratio of reaction exothermic to total reaction enthalpy at different temperatures, determine the second relationship curve of the degree of curing of the cable material to be tested as a function of temperature.

[0079] For example, degree of curing The calculation formulas include:

[0080] (6)

[0081] in, The total heat released during the curing reaction, The reaction at time t is exothermic. For non-isothermal crosslinking systems, the degree of cure... The second relationship curve can be obtained by integrating the DSC curve over time from the curing start point to the curing end point.

[0082] In one embodiment, such as Figure 3 As shown, step S201 above may include:

[0083] Step B: Determine the total enthalpy of the reaction during the heating process based on the peak area of ​​the exothermic peak in the first relationship curve.

[0084] For example, the DSC curve measured by a differential scanning calorimeter during the heating process can be obtained, and the total enthalpy of the reaction during the heating process can be determined by calculating the area of ​​the exothermic peak in the DSC curve. .

[0085] In one embodiment, please continue to refer to Figure 3 The above step S201 may include:

[0086] Step C: Based on the integral area of ​​the exothermic peak in the first relationship curve, determine the exothermic reaction at different temperatures during the heating process.

[0087] For example, the exothermic reaction at different temperatures can be obtained by integrating the exothermic peak curve of the DSC curve. Furthermore, based on formula (6), a second relationship curve of the curing degree of the cable material under test as a function of temperature is obtained.

[0088] In some embodiments, such as Figure 4 As shown, step S130 above may include:

[0089] Step S301: Based on the second relationship curve, determine the first natural logarithm of the rate of change of curing degree with temperature corresponding to multiple target temperatures and the second natural logarithm of the complement of curing degree with respect to the target value.

[0090] Step S302: Calculate the difference between the first natural logarithm value and the second natural logarithm value corresponding to multiple target temperatures, and fit a third relationship curve based on the difference to show how the difference between the target multiples of the first natural logarithm and the second natural logarithm changes with the reciprocal of the temperature.

[0091] For example, 5 to 20 different temperature points can be selected as target temperatures, and the residual enthalpy change at these target temperatures can be calculated. and Furthermore, with right By plotting the graph and fitting the curve to obtain its slope, the activation energy of the crosslinking reaction in the cable material under test can be calculated. This reduces the amount of data that needs to be measured, further improving the efficiency of determining the activation energy of the crosslinking reaction.

[0092] This application also provides a method for manufacturing high-voltage cables, used to manufacture high-voltage cables based on cable material to be tested, such as... Figure 5 As shown, it includes:

[0093] Step S110: Place the cable material to be tested in a differential scanning calorimeter for heating, and obtain the first relationship curve of the heat release rate of the cable material to be tested as a function of temperature during the heating process.

[0094] Step S120: Based on the first relationship curve, determine the second relationship curve of the degree of curing of the cable material to be tested as a function of temperature.

[0095] Step S130: Based on the second relationship curve, determine a third relationship curve showing how the difference between the target multiples of the first and second natural logarithms changes with the reciprocal of temperature. The first natural logarithm includes the natural logarithm of the rate of change of curing degree with temperature, and the second natural logarithm includes the natural logarithm of the complement of curing degree with respect to the target value.

[0096] Step S140: Determine the slope of the third relationship curve, and based on the slope, determine the activation energy of the crosslinking reaction of the cable material to be tested.

[0097] Step S150: Based on the activation energy of the crosslinking reaction, determine the crosslinking temperature for manufacturing high-voltage cables based on the cable material to be tested at different extrusion speeds. The maximum value of the crosslinking temperature is positively correlated with the activation energy of the crosslinking reaction.

[0098] For example, the relationship between the activation energy of the crosslinking reaction and the maximum crosslinking temperature of the pipeline at different production speeds can be fitted using empirical formulas. The maximum crosslinking temperature of the pipeline at different production speeds can be obtained by using the activation energy of the crosslinking reaction for different cable materials.

[0099] In one exemplary embodiment, the highest value of the crosslinking temperature is positively correlated with the extrusion rate.

[0100] In one exemplary embodiment, the relationship between crosslinking temperature and crosslinking activation energy may include: Where k represents the extrusion speed, and E a T represents the activation energy of the cross-linking reaction, R represents the gas constant, and T represents the activation energy of the cross-linking reaction. j This represents the crosslinking temperature, where a and b are constants.

[0101] Specifically, the value of 'a' can be 3.1, and the value of 'b' can be -23.2. In this case, the relationship between the crosslinking temperature and the activation energy of the crosslinking reaction can also include: It should be noted that a and b can be adjusted depending on the cable cross-linking equipment, and the values ​​of a and b are not limited in the embodiments of this application.

[0102] The aforementioned high-voltage cable manufacturing method achieves precise temperature control and efficiency optimization during the cable manufacturing process by adjusting the crosslinking temperature based on accurately and rapidly measured crosslinking reaction activation energy. Specifically, different cable materials have varying crosslinking reaction activation energies, resulting in differences in reactivity: materials with lower activation energies crosslink more easily, requiring a lower crosslinking pipe temperature; while materials with higher activation energies require higher temperatures to ensure sufficient crosslinking. Furthermore, there is a synergistic relationship between crosslinking temperature and extrusion speed; the faster the extrusion speed, the higher the required crosslinking temperature to ensure the cable reaches the standard degree of crosslinking within a limited crosslinking time. Based on empirical formulas for the maximum pipe temperature corresponding to different crosslinking activation energies, the optimal crosslinking temperature setting for a specific cable material during actual extrusion can be directly calculated. This enables refined production tailored to specific materials and speed, effectively improving extrusion efficiency while ensuring cable crosslinking quality.

[0103] In one possible implementation, 15g of uncrosslinked cable material A can be weighed into a differential scanning calorimeter (DSC) and heated at a rate of [missing information - likely a specific temperature range]. (10K / min) Heating from 50℃ to 250℃; Analyzing the measured DSC curves (e.g.) Figure 6 (As shown) Calculate the area of ​​the exothermic peak and the total enthalpy of the reaction during the heating process. The exothermic heat at different temperatures was 23.63 kJ; by integrating the exothermic peak curve of the DSC curve, the exothermic heat of the reaction at different temperatures was obtained. According to formula (6), the degree of curing is obtained. With temperature changes (e.g.) Figure 7 (As shown), further, by differentiating the curve of curing degree versus temperature, we obtain... The curve showing the change of temperature T (e.g.) Figure 8 (As shown); select 6 different temperature points and calculate the value at the selected temperature. and As shown in Table 1:

[0104] Table 1

[0105]

[0106] Again right Plot the graph, fit the curve to obtain its slope, and calculate the activation energy of the crosslinking reaction of the cable material. The value is 156 kJ / mol; the formula for the activation energy and the maximum crosslinking temperature of the pipe at different extrusion rates is obtained by fitting an empirical formula. The maximum cross-linking temperature of the pipe at different production speeds can be obtained by using the activation energy of the cross-linking reaction of different cable materials, as shown in Table 2.

[0107] Table 2

[0108]

[0109] In another possible implementation, 15g of uncrosslinked cable material B can be weighed into a DSC and heated at a rate of [missing information] under a nitrogen atmosphere. (10K / min) Heating from 50℃ to 250℃; Analyzing the measured DSC curves (e.g.) Figure 9 (As shown) Calculate the area of ​​the exothermic peak and the total enthalpy of the reaction during the heating process. The value is 16.58 kJ; by integrating the exothermic peak curve of the DSC curve, the values ​​at different temperatures are obtained. The degree of curing is obtained according to formula (6). With temperature changes (e.g.) Figure 10 (As shown), further, by differentiating the curve of curing degree versus temperature, we obtain... The curve showing the change of temperature T (e.g.) Figure 11 (As shown in Table 3), select 6 different temperature points and calculate the values ​​at the selected temperatures as shown in Table 3:

[0110] Table 3

[0111]

[0112] Again right Plot the graph, fit the curve to obtain its slope, and calculate the activation energy of the crosslinking reaction of the cable material. The value is 175 kJ / mol; the formula for the activation energy and the maximum crosslinking temperature of the pipeline at different production rates is obtained by fitting an empirical formula. The maximum cross-linking temperature of the pipe at different production speeds can be obtained by using the activation energy of the cross-linking reaction of different cable materials, as shown in Table 4.

[0113] Table 4

[0114]

[0115] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0116] In one exemplary embodiment, an electronic device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 12 As shown, the electronic device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and programs. The internal memory provides an environment for the operation of the operating system and programs in the non-volatile storage medium. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When the program is executed by the processor, it implements a method for testing the cross-linking performance of cable materials. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the electronic device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the electronic device, or external keyboards, touchpads, or mice, etc.

[0117] Those skilled in the art will understand that Figure 12The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0118] In one exemplary embodiment, an electronic device is provided, including a memory and a processor, wherein the memory stores a program, and the processor executes the program to implement the steps in the above-described method embodiments.

[0119] In one embodiment, a readable storage medium is provided on which a program is stored, which, when executed by a processor, implements the steps in the above method embodiments.

[0120] In one embodiment, a program product is provided, including a program that, when executed by a processor, implements the steps in the above method embodiments.

[0121] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a non-volatile readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0122] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0123] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for testing the crosslinking performance of cable materials, characterized in that, The method includes: The cable material to be tested was placed in a differential scanning calorimeter for heating, and the first relationship curve of the heat release rate of the cable material to be tested as a function of temperature was obtained during the heating process. Based on the first relationship curve, a second relationship curve is determined for the degree of curing of the cable material under test as a function of temperature. Based on the second relationship curve, a third relationship curve is determined to show how the difference between the target multiples of the first and second natural logarithms changes with the reciprocal of temperature. The first natural logarithm includes the natural logarithm of the rate of change of the degree of curing with temperature, and the second natural logarithm includes the natural logarithm of the complement of the degree of curing with respect to the target value. The slope of the third relationship curve is determined, and the crosslinking activation energy of the cable material under test is determined based on the negative of the product of the slope and the gas constant; the relationship between the crosslinking activation energy and the degree of curing includes: ； in, Indicates degree of cure, T represents temperature, k0 represents reaction rate, and E represents temperature. a The value represents the activation energy of the cross-linking reaction, R represents the gas constant, and n represents the order of the cross-linking reaction. This indicates the rate of temperature increase.

2. The method according to claim 1, characterized in that, The second relationship curve, determined based on the first relationship curve, for the degree of curing of the cable material under test as a function of temperature, includes: Based on the first relationship curve, the total reaction enthalpy during the heating process and the heat release at different temperatures are determined. Based on the ratio of the exothermic reaction to the total enthalpy of the reaction at different temperatures, a second relationship curve of the degree of curing of the cable material under test as a function of temperature is determined.

3. The method according to claim 2, characterized in that, Determining the total enthalpy of the reaction during the heating process based on the first relationship curve includes: The total enthalpy of the reaction during the heating process is determined based on the peak area of ​​the exothermic peak in the first relationship curve.

4. The method according to claim 2, characterized in that, The step of determining the exothermic reaction at different temperatures during the heating process based on the first relationship curve includes: Based on the integral area of ​​the exothermic peak in the first relationship curve, the exothermic reaction at different temperatures during the heating process is determined.

5. The method according to claim 1, characterized in that, The third relationship curve, which determines the variation of the difference between the target multiples of the first and second natural logarithms as a function of the reciprocal of temperature based on the second relationship curve, includes: Based on the second relationship curve, determine the first natural logarithm of the rate of change of the degree of curing with temperature corresponding to multiple target temperatures and the second natural logarithm of the complement of the degree of curing with respect to the target value; Calculate the difference between the first natural logarithm value and the second natural logarithm value corresponding to the plurality of target temperatures, and fit a third relationship curve based on the difference between the target multiples of the first natural logarithm and the second natural logarithm as a function of the reciprocal of temperature.

6. A method for manufacturing a high-voltage cable, characterized in that, The method for manufacturing high-voltage cables based on the cable material to be tested according to any one of claims 1 to 5, the method comprising: Based on the activation energy of the crosslinking reaction, the crosslinking temperature for manufacturing high-voltage cables from the test cable material at different extrusion speeds is determined, and the highest value of the crosslinking temperature is positively correlated with the activation energy of the crosslinking reaction.

7. The method according to claim 6, characterized in that, The maximum crosslinking temperature is positively correlated with the extrusion speed.

8. The method according to claim 6, characterized in that, The relationship between the crosslinking temperature and the activation energy of the crosslinking reaction includes: ； Where k represents the extrusion speed, E a T represents the activation energy of the cross-linking reaction, R represents the gas constant, and T represents the activation energy of the cross-linking reaction. j This represents the crosslinking temperature, where a and b are constants.

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