Method, device and storage medium for determining extrusion time of cable insulation material
By acquiring and fitting reference data on extrusion time, the degree of scorching of the insulation material is quantified, solving the problem of difficulty in determining the extrusion time of the insulation material in the existing technology, ensuring the reliability and stability of the high-voltage cable insulation layer, and reducing costs and difficulties.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ELECTRIC POWER RES INST CHINA SOUTHERN POWER GRID CO LTD
- Filing Date
- 2026-01-29
- Publication Date
- 2026-06-05
Smart Images
Figure CN122158273A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of insulation materials technology, and in particular to a method, apparatus, equipment and storage medium for determining the extrusion time of cable insulation materials. Background Technology
[0002] High-voltage cables are crucial power transmission and wind power grid connection equipment, and their insulation layer is fundamental to ensuring their safe and stable operation. The insulation material used for high-voltage cable insulation undergoes stages such as melt extrusion and high-temperature cross-linking during its preparation. Furthermore, to meet the length requirements of individual cables in practical applications, the raw materials need to undergo prolonged melt extrusion to obtain sufficient insulation material.
[0003] Due to factors such as extrusion equipment and raw material quality, scorching gradually accumulates during the melt extrusion process, resulting in poor performance of the obtained insulation material and thus affecting the reliability of the high-voltage cable insulation layer.
[0004] However, due to the lack of quantification of the degree of scorching of insulating materials, the relevant technologies make it difficult to determine the range of extrusion time required to ensure the performance of insulating materials. Summary of the Invention
[0005] Therefore, it is necessary to provide a method, apparatus, equipment, and storage medium for determining the extrusion time of cable insulation materials that can guarantee the performance of the insulation materials, in order to address the above-mentioned technical problems.
[0006] In a first aspect, this application provides a method for determining the extrusion time of cable insulation material, including:
[0007] Obtain reference data on extrusion time for insulation materials obtained by mixing raw materials for cable insulation layers at different preset times; wherein, the extrusion time reference data includes relative permittivity and / or oxidation induction period;
[0008] Based on the variation information of extrusion time reference data corresponding to different preset times, the target extrusion time for the raw materials during the preparation of cable insulation layer is determined.
[0009] In one embodiment, the insulating material includes a first insulating material and a second insulating material other than the first insulating material; the first insulating material is the insulating material corresponding to the shortest preset time; when the extrusion time reference data includes the relative permittivity, the change information includes a first rate of change corresponding to the relative permittivity; based on the change information of the extrusion time reference data corresponding to different preset times, the target preparation extrusion time for the raw material during the preparation of the cable insulation layer is determined, including: for each second insulating material, obtaining a first rate of change of the second insulating material based on the relative permittivity of the second insulating material and the relative permittivity of the first insulating material; fitting a first functional relationship between the first rate of change and the preparation extrusion time based on each preset time and its corresponding first rate of change; determining a first preparation extrusion time for the raw material based on the first functional relationship and the reference functional relationship, wherein the reference functional relationship characterizes the functional relationship between the rate of change of the relative permittivity of the reference material and the preparation extrusion time.
[0010] In one embodiment, determining the first preparation extrusion time for the raw material based on the first functional relationship and the reference functional relationship includes: taking the preparation extrusion time corresponding to the intersection of the image of the first functional relationship and the image of the reference functional relationship as the first preparation extrusion time.
[0011] In one embodiment, when the extrusion time reference data includes an oxidation induction period, the change information includes a second change rate corresponding to the oxidation induction period. Based on the change information of the extrusion time reference data corresponding to different preset times, the target extrusion time for the raw materials during the preparation of the cable insulation layer is determined, including: for each second insulation material, obtaining a second change rate of the second insulation material based on the oxidation induction period of the second insulation material and the oxidation induction period of the first insulation material; fitting a second functional relationship between the second change rate and the extrusion time based on each preset time and its corresponding second change rate; and determining the second extrusion time for the raw materials based on the second functional relationship and a preset oxidation induction period change rate threshold.
[0012] In one embodiment, the second preparation extrusion time for the raw material is determined based on the second functional relationship and the preset oxidation induction period change rate threshold, including: determining a target mapping relationship from the second functional relationship, wherein the second change rate in the target mapping relationship is equal to the preset oxidation induction period change rate threshold; and determining the preparation extrusion time in the target mapping relationship as the second preparation extrusion time.
[0013] In one embodiment, when the extrusion time reference data includes the relative permittivity and oxidation induction period, the target extrusion time for the raw materials during the preparation of the cable insulation layer is determined based on the change information of the extrusion time reference data corresponding to different preset times. This includes: determining the target extrusion time for the raw materials during the preparation of the cable insulation layer based on the minimum value of the first extrusion time and the second extrusion time.
[0014] Secondly, this application also provides a device for determining the extrusion time of cable insulation material, comprising:
[0015] The acquisition module is used to acquire reference data on the extrusion time of the insulation material obtained by mixing the raw materials for preparing the cable insulation layer according to different preset times; wherein, the extrusion time reference data includes the relative permittivity and / or oxidation induction period;
[0016] The determination module is used to determine the target extrusion time for the raw materials during the preparation of cable insulation layers based on the change information of extrusion time reference data corresponding to different preset time durations.
[0017] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:
[0018] Obtain reference data on extrusion time for insulation materials obtained by mixing raw materials for cable insulation layers at different preset times; wherein, the extrusion time reference data includes relative permittivity and / or oxidation induction period;
[0019] Based on the variation information of extrusion time reference data corresponding to different preset times, the target extrusion time for the raw materials during the preparation of cable insulation layer is determined.
[0020] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:
[0021] Obtain reference data on extrusion time for insulation materials obtained by mixing raw materials for cable insulation layers at different preset times; wherein, the extrusion time reference data includes relative permittivity and / or oxidation induction period;
[0022] Based on the variation information of extrusion time reference data corresponding to different preset times, the target extrusion time for the raw materials during the preparation of cable insulation layer is determined.
[0023] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:
[0024] Obtain reference data on extrusion time for insulation materials obtained by mixing raw materials for cable insulation layers at different preset times; wherein, the extrusion time reference data includes relative permittivity and / or oxidation induction period;
[0025] Based on the variation information of extrusion time reference data corresponding to different preset times, the target extrusion time for the raw materials during the preparation of cable insulation layer is determined.
[0026] The aforementioned method, apparatus, equipment, and storage medium for determining the extrusion time of cable insulation materials obtain reference data on the extrusion time of insulation materials corresponding to the raw materials used in preparing the cable insulation layer by mixing them for different preset times. Based on the changes in the reference data for extrusion time corresponding to different preset times, the target extrusion time for the raw materials during the preparation of the cable insulation layer is determined. Insulation materials corresponding to different preset times can simulate the scorching phenomenon in the actual melt extrusion process through the mixing process, eliminating the need for industrial extrusion equipment and reducing implementation costs and difficulty. Furthermore, based on the characteristics that the relative permittivity in the extrusion time reference data corresponding to different preset times reflects the degradation of electrical properties after scorching, and that the oxidation induction period reflects the degree of antioxidant consumption in the raw materials after scorching, the degree of scorching of insulation materials corresponding to different preset times is quantified as extrusion time reference data, thereby breaking through the technical barrier of difficulty in quantifying the degree of scorching in related technologies. Based on this, according to the change information of extrusion time reference data corresponding to different preset times, the target extrusion time that can ensure that the degree of scorching does not affect the overall performance of the cable during the preparation of the cable insulation layer can be determined, thereby ensuring the reliability of the prepared cable insulation layer. At the same time, the prepared insulation layer can meet the preparation requirements of high-voltage cables in different application scenarios. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies 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.
[0028] Figure 1 This is an application environment diagram of the method for determining the extrusion time of cable insulation material in one embodiment;
[0029] Figure 2 This is a schematic flowchart of a method for determining extrusion time in one embodiment;
[0030] Figure 3This is a schematic diagram of the process for determining the first preparation extrusion time in one embodiment;
[0031] Figure 4 This is a schematic diagram illustrating the determination of the first preparation extrusion time based on a first functional relationship and a reference functional relationship in one embodiment;
[0032] Figure 5 This is a schematic diagram of the process for determining the first preparation extrusion time in another embodiment;
[0033] Figure 6 This is a heat flow-time diagram obtained from the oxidation induction period test in one embodiment;
[0034] Figure 7 This is a schematic diagram illustrating the determination of the second preparation extrusion time based on a second functional relationship in one embodiment;
[0035] Figure 8 This is a flowchart illustrating the method for determining the extrusion time of cable insulation material in another embodiment;
[0036] Figure 9 This is a structural block diagram of a device for determining the extrusion time of cable insulation material in one embodiment;
[0037] Figure 10 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation
[0038] 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.
[0039] 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.
[0040] The insulation layer of high-voltage cables is made of low-density polyethylene (LDPE) as the base material, with the addition of dicumyl peroxide (DCP) crosslinking agent and antioxidant to form a mixture, which is then subjected to a high-temperature and high-pressure crosslinking reaction. The scorching phenomenon indicates that during the melt extrusion stage, the mixture undergoes a pre-crosslinking reaction and locally forms crosslinked macromolecular gels.
[0041] However, in continuous, long-length extrusion stages, scorching gradually accumulates over time. Excessive scorching can cause gel to pass through the filter as an impurity, reducing the quality of the high-voltage cable insulation material. Alternatively, the gel can clog the filter pores, leading to a decrease in yield. Therefore, the presence of scorching makes it difficult to meet the production needs of longer high-voltage cables.
[0042] In view of this, this application provides a method for determining the extrusion time of cable insulation material.
[0043] The method for determining the extrusion time of cable insulation material provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, terminal 102 communicates with server 104 via a network. A data storage system can store the data that server 104 needs to process. The data storage system can be integrated onto server 104 or located in the cloud or on other network servers. Terminal 102 can be, but is not limited to, various personal computers, laptops, smartphones, tablets, drones, low-altitude aircraft, IoT devices, and portable wearable devices. IoT devices can include smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, projection devices, etc. Portable wearable devices can include smartwatches, smart bracelets, head-mounted devices, etc. Head-mounted devices can be virtual reality (VR) devices, augmented reality (AR) devices, smart glasses, etc. Server 104 can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.
[0044] In one exemplary embodiment, such as Figure 2 As shown, a method for determining the extrusion time of cable insulation material is provided, which can be applied to... Figure 1 Taking server 104 as an example, the explanation includes the following steps S201 to S202. Wherein:
[0045] S201, Obtain reference data on the extrusion time of the insulation material obtained by mixing the raw materials for preparing the cable insulation layer according to different preset times.
[0046] The raw materials for preparing the insulation layer of cables (e.g., high-voltage cables) can be a mixture of particles consisting of a base material, a crosslinking agent, and an antioxidant. For example, the raw materials may include crosslinked polyethylene insulation particles.
[0047] The internal mixer is used to heat and melt the raw materials at a fixed speed and outlet temperature of the melt extrusion die, and to stir them to simulate the scorching phenomenon caused by localized high temperatures and stagnation during melt extrusion. Compared to melt extrusion equipment, the internal mixer has lower operating costs and is easier to use. Therefore, the internal mixer can be used to replace melting equipment by simulating the scorching phenomenon.
[0048] For example, the weight of the raw materials used in preparation is equal to the weight of each preset time, for example, it can be 5-10g.
[0049] In some embodiments, the preset duration represents the time for the raw materials to be mixed in the internal mixer, used to simulate the extrusion time of the raw materials in the actual melt extrusion stage. It should be noted that during the mixing process with different preset durations, the heating temperature and stirring speed of the raw materials, the internal mixer, and the mixing speed remain consistent to ensure that the only variable for the insulating material corresponding to different preset durations is the mixing duration.
[0050] Optionally, the number of preset durations and the specific length of each preset duration can be flexibly adjusted according to the selected raw materials and internal mixers, and this application does not impose any limitations.
[0051] For example, preset durations can include 5 minutes, 4 hours, 8 hours, and 12 hours. 5 minutes corresponds to the raw materials entering the mixer shortly after entering, with almost no retention, and the resulting insulating material is almost free of scorching; 4 hours corresponds to the initial stage of the raw materials entering the mixer, with a short retention time, and the resulting insulating material experiences slight scorching; 8 hours corresponds to the raw materials entering the mixer for a period of time, with a longer retention time, and the resulting insulating material experiences a certain degree of scorching; 12 hours corresponds to the raw materials entering the mixer for a longer period of time, with an excessively long retention time, and the resulting insulating material may experience severe scorching.
[0052] For example, the extrusion time reference data may include at least one of the relative permittivity and oxidation induction period. The relative permittivity can reflect the electrical property degradation of the compounded insulating material during the compounding process, and the oxidation induction period (OIT) can reflect the consumption of antioxidants in the compounded insulating material.
[0053] Furthermore, the more severe the degradation of electrical properties, the higher the degree of scorching; conversely, the less severe the degradation of electrical properties, the lower the degree of scorching. Correspondingly, the more antioxidants consumed, the higher the degree of scorching; conversely, the less antioxidants consumed, the lower the degree of scorching.
[0054] Optionally, to obtain reference data on extrusion time corresponding to different preset times, the insulating material corresponding to different preset times can be pre-treated first, and the relative permittivity and / or oxidation induction period obtained by measuring the pre-treated insulating material by a measuring instrument can be obtained.
[0055] S202, based on the change information of extrusion time reference data corresponding to different preset times, determine the target extrusion time for the raw materials during the preparation of cable insulation layer.
[0056] In some embodiments, the change information of the extrusion time reference data can reflect the change pattern of the extrusion time reference data with different preset durations.
[0057] Optionally, for insulating materials other than those corresponding to the shortest preset time, the change information of the extrusion time reference data corresponding to the preset time of the insulating material can be obtained based on the extrusion time reference data of the insulating material and the extrusion time reference data of the insulating material corresponding to the shortest preset time.
[0058] For example, the target extrusion time for maintaining a good scorch degree during the actual preparation of high-voltage cable insulation layers can be determined based on the variation information of extrusion time reference data corresponding to different preset time durations. Here, a good scorch degree range indicates the range within which the insulation performance, mechanical properties, etc., of the insulation layer can meet the application scenarios and production requirements of high-voltage cables.
[0059] Furthermore, based on the above embodiments, the proportions of base material, crosslinking agent, and antioxidant in the raw materials can be adjusted according to the length of the target extrusion time, so that the insulating material prepared through melt extrusion and other stages can meet the performance requirements for preparing high-voltage cable insulation layers.
[0060] In some embodiments, during the melt extrusion process, before the preparation extrusion time is about to reach the target preparation extrusion time, a prompt message indicating that melt extrusion is about to stop can be sent to the production personnel and the control terminal of the production equipment, so that the production personnel and the production equipment can prepare to stop melt extrusion in advance and reduce resource waste.
[0061] The aforementioned method for determining the extrusion time of cable insulation materials obtains reference data on the extrusion time of insulation materials corresponding to the raw materials used in preparing the cable insulation layer, obtained by mixing the raw materials for different preset times. Based on the changes in the reference data for extrusion time corresponding to different preset times, the target extrusion time for the raw materials during the preparation of the cable insulation layer is determined. Insulation materials corresponding to different preset times can simulate the scorching phenomenon in the actual melt extrusion process through the mixing process, eliminating the need for industrial extrusion equipment and reducing implementation costs and difficulty. Furthermore, based on the characteristics that the relative permittivity in the extrusion time reference data corresponding to different preset times reflects the degradation of electrical properties after scorching, and that the oxidation induction period reflects the degree of antioxidant consumption in the raw materials after scorching, the degree of scorching of insulation materials corresponding to different preset times is quantified as extrusion time reference data, thus breaking through the technical barrier of difficulty in quantifying the degree of scorching in related technologies. Based on this, according to the change information of extrusion time reference data corresponding to different preset times, the target extrusion time that can ensure that the degree of scorching does not affect the overall performance of the cable during the preparation of the cable insulation layer can be determined, thereby ensuring the reliability of the prepared cable insulation layer. At the same time, the prepared insulation layer can meet the preparation requirements of high-voltage cables in different application scenarios.
[0062] Optionally, if the extrusion time reference data includes the relative permittivity, such as Figure 3 As shown, S202 above includes:
[0063] S301, for each second insulating material, based on the relative permittivity of the second insulating material and the relative permittivity of the first insulating material, the first rate of change of the second insulating material is obtained.
[0064] The insulating material includes a first insulating material and a second insulating material other than the first insulating material. The first insulating material is the insulating material corresponding to the shortest preset time. The change information of the extrusion time reference data includes a first rate of change corresponding to the relative permittivity.
[0065] Optionally, the measurement process of the relative permittivity of the insulating material may include: pre-treating the insulating material, wherein the pre-treating process may include first hot-pressing the insulating material in a flat vulcanizing machine, then cross-linking it under high temperature and high pressure conditions, and pressing it into a flat plate sample; then evaporating electrodes onto the relative surface of the pre-treated flat plate sample, and measuring the relative permittivity using a dielectric spectrometer at room temperature.
[0066] For example, the first rate of change of the second insulating material It can be obtained through the following formula (1).
[0067] (1)
[0068] in, Indicates the time interval t. n The relative permittivity of the corresponding second insulating material, This represents the relative permittivity of the first insulating material.
[0069] S302, based on each preset time and its corresponding first rate of change, fit the first functional relationship between the first rate of change and the preparation extrusion time.
[0070] In some embodiments, each preset duration and its corresponding first rate of change can reflect the local variation law of the first rate of change with the preparation extrusion time. Therefore, a global variation law that reflects the first rate of change with the preparation extrusion time can be fitted based on the local variation law, i.e., a first functional relationship. For example, discrete data points can be fitted into a continuous curve using linear fitting.
[0071] Optionally, the preparation extrusion time in the first functional relationship is the natural logarithmic base of the first rate of change.
[0072] S303, based on the first functional relationship and the reference functional relationship, determine the first preparation extrusion time for the raw material.
[0073] The reference function relationship characterizes the functional relationship between the rate of change of the relative permittivity of the reference material and the extrusion time.
[0074] In some embodiments, the reference function relationship can be obtained in the following way: First, the relative permittivity of the reference material obtained by mixing the reference raw material for different preset durations is obtained, wherein the heating temperature and stirring speed and other condition parameters used in the mixing process of the reference raw material are consistent with the mixing process of the raw material; then, according to each preset duration and its corresponding reference change rate, the reference change rate and the preparation extrusion time are fitted to obtain the reference function relationship.
[0075] The specific process of obtaining the reference function relationship described above can be found in the description of obtaining the first function relationship in the above embodiments. The implementation principle and technical effect are similar, and will not be repeated here.
[0076] Optionally, the reference material can be a base material in the mixture selected for preparing the raw materials, such as a pure resin material.
[0077] For example, the relative permittivity of the insulating material and the relative permittivity of the reference material obtained above for different preset durations can be shown in Table 1.
[0078] Table 1
[0079]
[0080] Since the reference material lacks antioxidants and crosslinking agents, it does not possess anti-scorching properties. Furthermore, as shown in Table 1, the relative permittivity of the reference material increases more significantly with mixing time compared to the relative permittivity of the insulating material, indicating a faster rate of electrical property degradation. In other words, under normal conditions, the rate of change of the relative permittivity of the insulating material is lower than that of the reference material.
[0081] In some embodiments, for the reference rate of change and the first rate of change corresponding to the same preparation extrusion time in the reference function relationship and the first function relationship, if the first rate of change is less than the reference rate of change, it indicates that the insulating material obtained according to the preparation extrusion time is slightly scorched and can continue to be extruded; conversely, if the first rate of change is greater than the reference rate of change, it indicates that the insulating material obtained according to the preparation extrusion time has reached a relatively severe degree of scorching and is not suitable for further extrusion.
[0082] Based on the above embodiments, such as Figure 4 As shown, S303 includes: taking the preparation extrusion time corresponding to the intersection point of the first functional relationship image and the reference functional relationship image as the first preparation extrusion time.
[0083] For example, by combining the graph of the first functional relationship and the graph of the reference functional relationship, the intersection of the graph of the first functional relationship and the graph of the reference functional relationship indicates that, under the same preparation extrusion time, the first rate of change is equal to the reference rate of change. That is, under this preparation extrusion time, the antioxidant and crosslinking agent in the obtained insulating material have the same anti-scorching properties as the reference material, and the decay of the anti-scorching properties is irreversible. Therefore, under this preparation extrusion time, the degree of scorching of the insulating material has reached the critical state.
[0084] Therefore, the preparation extrusion time corresponding to the image intersection is taken as the first preparation extrusion time to limit the maximum preparation extrusion time of the raw material in the actual melt extrusion process.
[0085] The first functional relationship is obtained by fitting the first change rate to each preset time and its corresponding first change rate. Based on the intersection of the graph of the first functional relationship and the graph of the reference functional relationship, the preparation extrusion time corresponding to the first change rate of the insulating material being equal to the reference change rate of the reference material is determined as the first preparation extrusion time. By utilizing the fact that the reference raw material does not have anti-scorching properties, the limit of scorching degree during the melt extrusion process is quantified. The first preparation extrusion time is determined according to the preparation extrusion time corresponding to the limit of scorching degree. The preparation of high-voltage cable insulation material according to the first preparation extrusion time can ensure the reliability and stability of the high-voltage cable insulation layer.
[0086] Optionally, if the extrusion time reference data includes the relative permittivity, such as Figure 5 As shown, S202 above includes:
[0087] S501, for each second insulating material, based on the oxidation induction period of the second insulating material and the oxidation induction period of the first insulating material, the second rate of change of the second insulating material is obtained.
[0088] For example, the change information of the extrusion time reference data may also include a second rate of change corresponding to the oxidation induction period.
[0089] Optionally, the measurement process of the oxidation induction period of the insulating material may include: pre-treating the insulating material, wherein the pre-treating process may include first hot-pressing the insulating material in a flat vulcanizing machine, then cross-linking it under high temperature and high pressure conditions, and pressing it into a flat plate sample; then using a differential scanning calorimeter to test the oxidation induction period of the pre-treated flat plate sample to obtain the oxidation induction period of the insulating material.
[0090] For example, in the oxidation induction period test, a portion of the sample can be taken from a plate-shaped sample and placed in a crucible. Nitrogen gas is then introduced at room temperature for a period of time. The sample is then heated to a target temperature (e.g., 200°C) at a preset heating rate (e.g., 20°C / min) and kept constant at the target temperature for a period of time. After this period, oxygen is introduced to replace the nitrogen gas, and the time point T1 at which oxygen is introduced is recorded. From this, we can obtain... Figure 6 The heat flux of the sample changes over time, and the curve corresponding to this change is analyzed using tangent analysis. The curve for the constant target temperature stage is extended horizontally and intersected by the tangent at the point of maximum slope of the descending edge of the exothermic peak, yielding time point T2. The oxidation induction period is then T2-T1. The oxidation induction periods measured for samples prepared with extrusion times of 5 min, 4 h, 8 h, and 12 h were 1136.46 s, 683.94 s, 394.22 s, and 332.34 s, respectively.
[0091] For example, the second rate of change S of the second insulating material n It can be obtained through the following formula (2).
[0092] (2)
[0093] Among them, OIT tn Indicates the time interval t. n The corresponding oxidation induction period of the second insulating material, OIT t0 This indicates the oxidation induction period of the first insulating material.
[0094] S502, based on each preset time and its corresponding second rate of change, fit the second rate of change and the second function relationship between the preparation extrusion time.
[0095] In some embodiments, each preset duration and its corresponding second rate of change can reflect the local variation law of the second rate of change with the preparation extrusion time. Therefore, a global variation law reflecting the second rate of change with the preparation extrusion time, i.e., a second functional relationship, can be fitted based on the local variation law. For example, discrete data points can be fitted into a continuous curve using linear fitting.
[0096] Optionally, the preparation extrusion time in the second functional relationship is the natural logarithmic base of the second rate of change.
[0097] S503, based on the second functional relationship and the preset oxidation induction period change rate threshold, determines the second preparation extrusion time for the raw materials.
[0098] The preset oxidation induction period change rate threshold can be the oxidation induction period change rate that is uniformly recognized in the industry for anti-scorching performance failure, for example, it can be 20%.
[0099] Correspondingly, if the second rate of change is less than the preset oxidation induction period rate of change threshold, it indicates that the insulating material obtained according to the extrusion time is slightly scorched and can continue to be extruded; conversely, if the second rate of change is greater than the preset oxidation induction period rate of change threshold, it indicates that the insulating material obtained according to the extrusion time has reached a relatively severe degree of scorching and is not suitable for further extrusion.
[0100] Based on the above embodiments, such as Figure 7 As shown, S503 includes: determining the target mapping relationship from the second functional relationship; and determining the preparation extrusion time in the target mapping relationship as the second preparation extrusion time.
[0101] Optionally, the second rate of change in the target mapping relationship is equal to the preset oxidation induction period rate of change threshold. Therefore, the preparation extrusion time in the determined target mapping relationship can be determined as the second preparation extrusion time.
[0102] For example Figure 7 In the context of the target mapping relationship, the preparation extrusion time is 15.066h, so the second preparation extrusion time can be determined to be 15.066h.
[0103] In the above embodiments, a second functional relationship is obtained by fitting each preset duration and its corresponding second rate of change. A target mapping relationship is determined from the image of the second functional relationship based on a preset oxidation induction period rate of change threshold. The preparation extrusion time in the determined target mapping relationship is determined as the second preparation extrusion time. The scorch degree of the insulating material is quantified as the oxidation induction period rate of change. The second preparation extrusion time is determined according to the preset oxidation induction period rate of change threshold. Then, the high-voltage cable insulation material is prepared according to the first preparation extrusion time, which can ensure the reliability and stability of the high-voltage cable insulation layer.
[0104] Based on the above embodiments, in some embodiments, when the extrusion time reference data includes the relative permittivity and oxidation induction period, the above S203 includes: determining the target extrusion time for the raw material during the preparation of the cable insulation layer based on the minimum value of the first preparation extrusion time and the second preparation extrusion time.
[0105] For example, the first preparation extrusion time is the longest preparation extrusion time determined by quantifying the degree of scorching of the insulating material based on the rate of change of the relative permittivity, and the second preparation extrusion time is the longest preparation extrusion time determined by quantifying the degree of scorching of the insulating material based on the rate of change of the oxidation induction period. Typically, the first preparation extrusion time and the second preparation extrusion time are not equal.
[0106] In some embodiments, the target extrusion time for the raw materials during the preparation of the high-voltage cable insulation layer is determined based on the minimum of the first preparation extrusion time and the second preparation extrusion time. This ensures that the raw materials are melt-extruded according to the target preparation extrusion time, which guarantees that the electrical performance degradation of the obtained insulation material does not exceed that of the reference material, and at the same time guarantees that the oxidation induction period change rate of the obtained insulation material is not lower than the preset oxidation induction period change rate threshold.
[0107] In the above embodiments, when the extrusion time reference data includes the relative permittivity and oxidation induction period, the minimum value between the first preparation extrusion time and the second preparation extrusion time is used as the target preparation extrusion time. This ensures that the raw materials will not cause insulation defects due to excessively rapid decay of electrical properties in actual melt extrusion production, nor will they suffer from severe scorching due to depletion of antioxidants. This is beneficial to the balance between production safety and production efficiency of high-voltage cable insulation layers.
[0108] Figure 8 This is a flowchart illustrating a method for determining the extrusion time of cable insulation material in another embodiment. Based on the above embodiments, this embodiment provides an optional example of a method for determining the extrusion time. (Combined with...) Figure 8 The specific implementation process is as follows:
[0109] S801, Obtain reference data on the extrusion time of the insulation material obtained by mixing the raw materials for preparing the cable insulation layer according to different preset times.
[0110] The extrusion time reference data includes the relative permittivity and / or oxidation induction period.
[0111] If the extrusion time reference data includes the relative permittivity, execute S802~S804 as follows.
[0112] S802, for each second insulating material, based on the relative permittivity of the second insulating material and the relative permittivity of the first insulating material, the first rate of change of the second insulating material is obtained.
[0113] S803, based on each preset time and its corresponding first rate of change, fit the first functional relationship between the first rate of change and the preparation extrusion time.
[0114] S804, the preparation extrusion time corresponding to the intersection point of the first functional relationship image and the reference functional relationship image is taken as the first preparation extrusion time.
[0115] The reference function relationship characterizes the functional relationship between the rate of change of the relative permittivity of the reference material and the extrusion time.
[0116] If the extrusion time reference data includes the oxidation induction period, execute S805~S808 as follows.
[0117] S805, for each second insulating material, based on the oxidation induction period of the second insulating material and the oxidation induction period of the first insulating material, the second rate of change of the second insulating material is obtained.
[0118] S806, based on each preset time and its corresponding second rate of change, fit the second rate of change and the second function relationship between the preparation extrusion time.
[0119] S807, determine the target mapping relationship from the second functional relationship.
[0120] Among them, the second rate of change in the target mapping relationship is equal to the preset oxidation induction period rate of change threshold.
[0121] S808, the preparation extrusion time in the target mapping relationship is determined as the second preparation extrusion time.
[0122] If the extrusion time reference data includes the relative permittivity and oxidation induction period, execute S809 as follows.
[0123] S809, determine the target extrusion time for the raw materials during the preparation of the cable insulation layer based on the minimum value of the first extrusion time and the second extrusion time.
[0124] The specific processes of S801-S809 described above can be found in the description of the above method embodiments. Their implementation principles and technical effects are similar, and will not be repeated here.
[0125] 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.
[0126] Based on the same inventive concept, this application also provides a preparation extrusion time determining apparatus for implementing the preparation extrusion time determining method described above. The solution provided by this apparatus is similar to the solution described in the above method; therefore, the specific limitations in one or more preparation extrusion time determining apparatus embodiments provided below can be found in the limitations of the preparation extrusion time determining method described above, and will not be repeated here.
[0127] In one exemplary embodiment, such as Figure 9 As shown, a device for determining the extrusion time of cable insulation material is provided, comprising: an acquisition module 910 and a determination module 920, wherein:
[0128] The acquisition module 910 is used to acquire reference data of extrusion time corresponding to the insulation material obtained by mixing the raw materials for preparing the cable insulation layer according to different preset times; wherein, the extrusion time reference data includes the relative permittivity and / or oxidation induction period;
[0129] The determination module 920 is used to determine the target extrusion time for the raw materials during the preparation of the cable insulation layer based on the change information of the extrusion time reference data corresponding to different preset time lengths.
[0130] In some embodiments, when the extrusion time reference data includes the relative permittivity, the determining module 920 is further configured to, for each second insulating material, obtain a first rate of change of the second insulating material based on the relative permittivity of the second insulating material and the relative permittivity of the first insulating material; fit a first functional relationship between the first rate of change and the preparation extrusion time according to each preset time and its corresponding first rate of change; and determine a first preparation extrusion time for the raw material based on the first functional relationship and the reference functional relationship, wherein the reference functional relationship characterizes the functional relationship between the rate of change of the relative permittivity of the reference material and the preparation extrusion time.
[0131] In some embodiments, when the extrusion time reference data includes the relative permittivity, the determination module 920 is further configured to use the preparation extrusion time corresponding to the intersection of the image of the first functional relationship and the image of the reference functional relationship as the first preparation extrusion time.
[0132] In some embodiments, when the extrusion time reference data includes the oxidation induction period, the determination module 920 is further configured to, for each second insulating material, obtain a second rate of change of the second insulating material based on the oxidation induction period of the second insulating material and the oxidation induction period of the first insulating material; fit a second functional relationship between the second rate of change and the preparation extrusion time according to each preset time and its corresponding second rate of change; and determine a second preparation extrusion time for the raw material based on the second functional relationship and a preset oxidation induction period rate of change threshold.
[0133] In some embodiments, when the extrusion time reference data includes the oxidation induction period, the determination module 920 is further configured to determine a target mapping relationship from the second functional relationship, wherein the second rate of change in the target mapping relationship is equal to a preset oxidation induction period rate of change threshold; and to determine the preparation extrusion time in the target mapping relationship as the second preparation extrusion time.
[0134] In some embodiments, when the extrusion time reference data includes the relative permittivity and oxidation induction period, the determination module 920 is further configured to determine the target preparation extrusion time for the raw material during the preparation of the cable insulation layer based on the minimum of the first preparation extrusion time and the second preparation extrusion time.
[0135] Each module in the aforementioned extrusion time determination device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the operations corresponding to each module.
[0136] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 10 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores reference data on extrusion times for insulating materials. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a method for determining extrusion time.
[0137] Those skilled in the art will understand that Figure 10 The 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 computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.
[0138] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:
[0139] Obtain reference data on extrusion time for insulation materials obtained by mixing raw materials for cable insulation layers at different preset times; wherein, the extrusion time reference data includes relative permittivity and / or oxidation induction period;
[0140] Based on the variation information of extrusion time reference data corresponding to different preset times, the target extrusion time for the raw materials during the preparation of cable insulation layer is determined.
[0141] In one embodiment, when the processor executes the computer program, it further performs the following steps: for each second insulating material, based on the relative permittivity of the second insulating material and the relative permittivity of the first insulating material, a first rate of change of the second insulating material is obtained; according to each preset duration and its corresponding first rate of change, a first functional relationship between the first rate of change and the preparation extrusion duration is fitted; based on the first functional relationship and a reference functional relationship, a first preparation extrusion duration for the raw material is determined, wherein the reference functional relationship characterizes the functional relationship between the rate of change of the relative permittivity of the reference material and the preparation extrusion duration.
[0142] In one embodiment, when the processor executes the computer program, it further implements the following steps: taking the preparation extrusion time corresponding to the intersection point of the image of the first functional relationship and the image of the reference functional relationship as the first preparation extrusion time.
[0143] In one embodiment, when the processor executes the computer program, it further performs the following steps: for each second insulating material, based on the oxidation induction period of the second insulating material and the oxidation induction period of the first insulating material, a second rate of change of the second insulating material is obtained; according to each preset duration and its corresponding second rate of change, a second functional relationship between the second rate of change and the preparation extrusion duration is fitted; based on the second functional relationship and the preset oxidation induction period rate of change threshold, a second preparation extrusion duration for the raw material is determined.
[0144] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining a target mapping relationship from a second functional relationship, wherein the second rate of change in the target mapping relationship is equal to a preset oxidation induction period rate of change threshold; and determining the preparation extrusion time in the target mapping relationship as the second preparation extrusion time.
[0145] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining a target preparation extrusion time for the raw material during the preparation of the cable insulation layer, based on the minimum of a first preparation extrusion time and a second preparation extrusion time.
[0146] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:
[0147] Obtain reference data on extrusion time for insulation materials obtained by mixing raw materials for cable insulation layers at different preset times; wherein, the extrusion time reference data includes relative permittivity and / or oxidation induction period;
[0148] Based on the variation information of extrusion time reference data corresponding to different preset times, the target extrusion time for the raw materials during the preparation of cable insulation layer is determined.
[0149] In one embodiment, when the processor executes the computer program, it further performs the following steps: for each second insulating material, based on the relative permittivity of the second insulating material and the relative permittivity of the first insulating material, a first rate of change of the second insulating material is obtained; according to each preset duration and its corresponding first rate of change, a first functional relationship between the first rate of change and the preparation extrusion duration is fitted; based on the first functional relationship and a reference functional relationship, a first preparation extrusion duration for the raw material is determined, wherein the reference functional relationship characterizes the functional relationship between the rate of change of the relative permittivity of the reference material and the preparation extrusion duration.
[0150] In one embodiment, when the processor executes the computer program, it further implements the following steps: taking the preparation extrusion time corresponding to the intersection point of the image of the first functional relationship and the image of the reference functional relationship as the first preparation extrusion time.
[0151] In one embodiment, when the processor executes the computer program, it further performs the following steps: for each second insulating material, based on the oxidation induction period of the second insulating material and the oxidation induction period of the first insulating material, a second rate of change of the second insulating material is obtained; according to each preset duration and its corresponding second rate of change, a second functional relationship between the second rate of change and the preparation extrusion duration is fitted; based on the second functional relationship and the preset oxidation induction period rate of change threshold, a second preparation extrusion duration for the raw material is determined.
[0152] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining a target mapping relationship from a second functional relationship, wherein the second rate of change in the target mapping relationship is equal to a preset oxidation induction period rate of change threshold; and determining the preparation extrusion time in the target mapping relationship as the second preparation extrusion time.
[0153] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining a target preparation extrusion time for the raw material during the preparation of the cable insulation layer, based on the minimum of a first preparation extrusion time and a second preparation extrusion time.
[0154] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:
[0155] Obtain reference data on extrusion time for insulation materials obtained by mixing raw materials for cable insulation layers at different preset times; wherein, the extrusion time reference data includes relative permittivity and / or oxidation induction period;
[0156] Based on the variation information of extrusion time reference data corresponding to different preset times, the target extrusion time for the raw materials during the preparation of cable insulation layer is determined.
[0157] In one embodiment, when the processor executes the computer program, it further performs the following steps: for each second insulating material, based on the relative permittivity of the second insulating material and the relative permittivity of the first insulating material, a first rate of change of the second insulating material is obtained; according to each preset duration and its corresponding first rate of change, a first functional relationship between the first rate of change and the preparation extrusion duration is fitted; based on the first functional relationship and a reference functional relationship, a first preparation extrusion duration for the raw material is determined, wherein the reference functional relationship characterizes the functional relationship between the rate of change of the relative permittivity of the reference material and the preparation extrusion duration.
[0158] In one embodiment, when the processor executes the computer program, it further implements the following steps: taking the preparation extrusion time corresponding to the intersection point of the image of the first functional relationship and the image of the reference functional relationship as the first preparation extrusion time.
[0159] In one embodiment, when the processor executes the computer program, it further performs the following steps: for each second insulating material, based on the oxidation induction period of the second insulating material and the oxidation induction period of the first insulating material, a second rate of change of the second insulating material is obtained; according to each preset duration and its corresponding second rate of change, a second functional relationship between the second rate of change and the preparation extrusion duration is fitted; based on the second functional relationship and the preset oxidation induction period rate of change threshold, a second preparation extrusion duration for the raw material is determined.
[0160] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining a target mapping relationship from a second functional relationship, wherein the second rate of change in the target mapping relationship is equal to a preset oxidation induction period rate of change threshold; and determining the preparation extrusion time in the target mapping relationship as the second preparation extrusion time.
[0161] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining a target preparation extrusion time for the raw material during the preparation of the cable insulation layer, based on the minimum of a first preparation extrusion time and a second preparation extrusion time.
[0162] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. 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.
[0163] 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.
[0164] 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 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 determining the extrusion length of a cable insulation material, characterized in that The method includes: Obtain reference data on extrusion time for insulation materials obtained by mixing raw materials for cable insulation layers at different preset times; wherein, the extrusion time reference data includes relative permittivity and / or oxidation induction period; Based on the variation information of extrusion time reference data corresponding to different preset times, the target extrusion time for the raw materials during the preparation of the cable insulation layer is determined.
2. The method of claim 1, wherein, The insulating material includes a first insulating material and a second insulating material other than the first insulating material; the first insulating material is the insulating material corresponding to the shortest preset time; when the extrusion time reference data includes a relative permittivity, the change information includes a first rate of change corresponding to the relative permittivity; determining the target extrusion time for the raw materials during the preparation of the cable insulation layer based on the change information of the extrusion time reference data corresponding to different preset times includes: For each of the second insulating materials, a first rate of change of the second insulating material is obtained based on the relative permittivity of the second insulating material and the relative permittivity of the first insulating material; Based on each preset duration and its corresponding first rate of change, a first functional relationship between the first rate of change and the preparation extrusion duration is fitted. Based on the first functional relationship and the reference functional relationship, the first preparation extrusion time for the raw material is determined, wherein the reference functional relationship characterizes the functional relationship between the rate of change of the relative permittivity of the reference material and the preparation extrusion time.
3. The method of claim 2, wherein, Based on the first functional relationship and the reference functional relationship, the first preparation extrusion time for the raw material is determined, including: The preparation extrusion time corresponding to the intersection point of the first functional relationship image and the reference functional relationship image is taken as the first preparation extrusion time.
4. The method according to claim 2 or 3, characterized in that, When the extrusion time reference data includes an oxidation induction period, the change information includes a second change rate corresponding to the oxidation induction period; determining the target extrusion time for the raw material during the preparation of the cable insulation layer based on the change information of the extrusion time reference data corresponding to different preset times includes: For each of the second insulating materials, a second rate of change of the second insulating material is obtained based on the oxidation induction period of the second insulating material and the oxidation induction period of the first insulating material; Based on each preset duration and its corresponding second rate of change, a second functional relationship between the second rate of change and the preparation extrusion duration is fitted. Based on the second functional relationship and the preset oxidation induction period change rate threshold, the second preparation extrusion time for the raw material is determined.
5. The method according to claim 4, characterized in that, The determination of the second preparation extrusion time for the raw material based on the second functional relationship and the preset oxidation induction period change rate threshold includes: The target mapping relationship is determined from the second functional relationship, wherein the second rate of change in the target mapping relationship is equal to the preset oxidation induction period rate of change threshold; The preparation extrusion time in the target mapping relationship is determined as the second preparation extrusion time.
6. The method according to claim 5, characterized in that, When the extrusion time reference data includes relative permittivity and oxidation induction period, determining the target extrusion time for the raw material during the preparation of the cable insulation layer, based on the variation information of the extrusion time reference data corresponding to different preset times, includes: The target extrusion time for the raw materials is determined based on the minimum of the first extrusion time and the second extrusion time during the preparation of the cable insulation layer.
7. A device for determining extrusion time, characterized in that, The device includes: The acquisition module is used to acquire reference data of extrusion time corresponding to the insulation material obtained by mixing the raw materials for preparing cable insulation layer according to different preset time periods; wherein, the extrusion time reference data includes relative permittivity and / or oxidation induction period; The determination module is used to determine the target extrusion time for the raw materials during the preparation of the cable insulation layer based on the change information of extrusion time reference data corresponding to different preset time durations.
8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.
10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.