Method and apparatus for evaluating high voltage ac cable insulation-shield matching

Abstract

The application relates to a method and device for evaluating the insulation-shielding matching property of a high-voltage alternating-current cable. The method comprises the following steps: obtaining a target insulation sample, and respective shielding samples and respective target composite samples corresponding to the target insulation sample; wherein the respective target composite samples are prepared by respectively compounding the target insulation material and the respective shielding materials; performing first performance tests on the target insulation sample and the respective shielding samples by using a first device to obtain first performance results; wherein the first performance tests at least include thermal expansion performance tests; performing second performance tests on the respective target composite samples by using a second device to obtain second performance results; wherein the second performance tests at least include breakdown performance tests; and selecting a target shielding material matched with the target insulation sample from the respective shielding materials according to the first performance results and the second performance results. The application can improve the accuracy of cable performance evaluation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a method and device for evaluating insulation-shielding matching of high-voltage alternating current cables. BACKGROUND

[0002] In high-voltage power cables, the insulation layer, the inner and outer shielding layers are decisive factors affecting the operation condition, service life and other key issues of the cable.

[0003] At present, in the design process of cable insulation materials and shielding materials, the method adopted is to evaluate each selected insulation material and each selected shielding material respectively, and to match the selected insulation material with the optimal performance and the selected shielding material with the optimal performance to design the materials of the cable.

[0004] However, there is still a large difference between the actual performance of the cable obtained by using the above matching method and the target performance requirement, and therefore, improvement is urgently needed. SUMMARY

[0005] Therefore, it is necessary to provide a method and device for evaluating insulation-shielding matching of high-voltage alternating current cables, which can improve the accuracy of cable performance evaluation.

[0006] In a first aspect, the present application provides a method for evaluating insulation-shielding matching of high-voltage alternating current cables, the method comprising:

[0007] obtaining a target insulation sample, and each shielding sample and each target composite sample corresponding to the target insulation sample; wherein each target composite sample is prepared by compounding the target insulation material with each shielding material;

[0008] performing first performance testing on the target insulation sample and each shielding sample by a first device respectively to obtain first performance results; wherein the first performance testing at least includes thermal expansion performance testing;

[0009] performing second performance testing on each target composite sample by a second device to obtain second performance results; wherein the second performance testing at least includes breakdown performance testing;

[0010] selecting a target shielding material matched with the target insulation sample from each shielding material according to the first performance results and the second performance results.

[0011] In one embodiment, performing first performance testing on the target insulation sample and each shielding sample by a first device respectively to obtain first performance results comprises:

[0012] The first device respectively performs thermal expansion performance tests on the target insulation sample and each shielding sample to obtain a target performance curve corresponding to the target insulation sample and test performance curves corresponding to each shielding sample;

[0013] The first performance result is determined according to the target performance curve and each test performance curve.

[0014] In one embodiment, the first performance result is determined according to the target performance curve and each test performance curve, including:

[0015] A trend similarity of each test performance curve to the target performance curve is determined.

[0016] The first performance result is determined according to each trend similarity.

[0017] In one embodiment, the second device performs a second performance test on each target composite sample to obtain a second test result, including:

[0018] At least one first composite sample is determined from each target composite sample.

[0019] The second device performs a breakdown performance test on the target insulation sample and each first composite sample to obtain a target breakdown performance corresponding to the target insulation sample and test breakdown performances corresponding to each first composite sample.

[0020] The second performance result is determined according to the target breakdown performance and the test breakdown performances.

[0021] In one embodiment, the second performance result is determined according to the target breakdown performance and the test breakdown performances, including:

[0022] At least one second composite sample is determined from each target composite sample.

[0023] The second device performs a tear strength test on each second composite sample to obtain each test tear strength corresponding thereto.

[0024] The second performance result is determined according to each test tear strength, the target breakdown performance and the test breakdown performances.

[0025] In one embodiment, the second device performs a second performance test on each target composite sample to obtain a second test result, including:

[0026] At least one third composite sample is determined from each target composite sample.

[0027] The third device performs a cooling cycle test on each third composite sample to obtain a third composite sample after the cooling cycle test.

[0028] The second performance test is performed on the third composite sample after the cooling cycle test by the second device, and a second performance result is obtained.

[0029] In a second aspect, the application further provides a device for evaluating the insulation-screen matching of a high-voltage AC cable, the device comprising:

[0030] The acquisition module is configured to acquire a target insulation sample, and respective shielding samples and respective target composite samples corresponding to the target insulation sample, wherein each target composite sample is prepared by compounding a target insulation material with a respective shielding material.

[0031] The first test module is configured to perform a first performance test on the target insulation sample and the respective shielding samples by using a first device, and obtain a first performance result, wherein the first performance test at least includes a thermal expansion performance test.

[0032] The second test module is configured to perform a second performance test on the respective target composite samples by using a second device, and obtain a second performance result, wherein the second performance test at least includes a breakdown performance test.

[0033] The matching module is configured to select a target shielding material matched with the target insulation sample from the respective shielding materials according to the first performance result and the second performance result.

[0034] In a third aspect, the application further provides a computer device, which comprises a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0035] The acquisition module is configured to acquire a target insulation sample, and respective shielding samples and respective target composite samples corresponding to the target insulation sample, wherein each target composite sample is prepared by compounding a target insulation material with a respective shielding material.

[0036] The first test module is configured to perform a first performance test on the target insulation sample and the respective shielding samples by using a first device, and obtain a first performance result, wherein the first performance test at least includes a thermal expansion performance test.

[0037] The second test module is configured to perform a second performance test on the respective target composite samples by using a second device, and obtain a second performance result, wherein the second performance test at least includes a breakdown performance test.

[0038] The matching module is configured to select a target shielding material matched with the target insulation sample from the respective shielding materials according to the first performance result and the second performance result.

[0039] In a fourth aspect, the application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the following steps:

[0040] obtain a target insulation sample, and each shielding sample and each target composite sample corresponding to the target insulation sample, wherein each target composite sample is prepared by compounding the target insulation material with each shielding material;

[0041] perform first performance testing on the target insulation sample and each shielding sample by using the first device respectively to obtain first performance results, wherein the first performance testing at least includes thermal expansion performance testing;

[0042] perform second performance testing on each target composite sample by using the second device to obtain second performance results, wherein the second performance testing at least includes breakdown performance testing;

[0043] select a target shielding material matched with the target insulation sample from the shielding materials according to the first performance results and the second performance results.

[0044] In a fifth aspect, the present application further provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the following steps:

[0045] obtain a target insulation sample, and each shielding sample and each target composite sample corresponding to the target insulation sample, wherein each target composite sample is prepared by compounding the target insulation material with each shielding material;

[0046] perform first performance testing on the target insulation sample and each shielding sample by using the first device respectively to obtain first performance results, wherein the first performance testing at least includes thermal expansion performance testing;

[0047] perform second performance testing on each target composite sample by using the second device to obtain second performance results, wherein the second performance testing at least includes breakdown performance testing;

[0048] select a target shielding material matched with the target insulation sample from the shielding materials according to the first performance results and the second performance results.

[0049] The method and device for evaluating the insulation-shielding matching of high-voltage AC cables described above, when testing the matching performance of each shielding material and the target insulation material, first performance results in the thermal expansion performance dimension are obtained by performing first performance testing on each shielding sample, second performance results at least including the breakdown performance dimension are obtained by performing second performance testing on each target composite sample, the adaptability between each shielding material and the target insulation material is analyzed from multiple dimensions based on the first performance results and the second performance results, and then the target shielding material matched with the target insulation material is screened out, thereby improving the accuracy of the evaluation of the performance of the cable in the research and development process. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 An application environment diagram for a method for evaluating insulation-to- shield matching of high voltage AC cables in one embodiment;

[0051] Figure 2 A flowchart of a method for evaluating insulation-to-shield matching of high voltage AC cables in one embodiment;

[0052] Figure 3 A flowchart of determining a first performance result in one embodiment;

[0053] Figure 4 A diagram of a coefficient of thermal expansion curve in one embodiment;

[0054] Figure 5 A diagram of a coefficient of deformation curve in one embodiment;

[0055] Figure 6 A flowchart of determining a first performance result based on a similarity trend in one embodiment;

[0056] Figure 7 A flowchart of determining a second performance result based on a breakdown performance test in one embodiment;

[0057] Figure 8 A flowchart of determining a second performance result based on a tear resistance strength test in one embodiment;

[0058] Figure 9 A flowchart of determining a second performance result based on a cold- hot cycle test in one embodiment;

[0059] Figure 10 A flowchart of a method for evaluating insulation-to-shield matching of high voltage AC cables in another embodiment;

[0060] Figure 11 A block diagram of an apparatus for evaluating insulation-to-shield matching of high voltage AC cables in one embodiment;

[0061] Figure 12 An internal structure diagram of a computer device in one embodiment. DETAILED DESCRIPTION

[0062] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0063] The method for evaluating insulation-to-shield matching of high voltage AC cables provided by the embodiments of the present application can be applied toFigure 1 The application environment shown. Among them, the first device and the second device communicate with the server 104 through the network. The data storage system can store the data required by the server 104 to process. The data storage system can be integrated on the server 104, or placed on the cloud or other network servers. For example, the server 104 obtains a target insulation sample, and each shielding sample and each target composite sample corresponding to the target insulation sample; wherein each target composite sample is prepared by compounding the target insulation material with each shielding material; the first device is used to perform a first performance test on the target insulation sample and each shielding sample respectively, and a first performance result is obtained; wherein the first performance test at least includes thermal expansion performance test; the second device is used to perform a second performance test on each target composite sample, and a second performance result is obtained; wherein the second performance test at least includes breakdown performance test; the server 104 selects a target shielding material matched with the target insulation sample from each shielding material according to the first performance result and the second performance result. The server 104 can be implemented by an independent server or a server cluster composed of multiple servers.

[0064] Three-layer extrusion high-voltage power cable includes outer shielding layer, insulation layer and inner shielding layer, wherein the insulation layer, inner and outer shielding layer are decisive factors affecting the cable operating conditions, service life and other key issues, therefore the development of high-voltage cable manufacturing industry cannot be separated from the research, screening and evaluation of high-quality cable materials. The interface matching performance of shielding-insulation in cable in electrical, thermal, mechanical and other aspects will also affect the actual operation of the cable, however, in addition to other related equipment of the cable system, the current evaluation method for cable performance mainly focuses on the two fields of insulation material and shielding material alone, and there is no complete evaluation system for the composite interface between the two. Therefore, under the existing evaluation system, the insulation material and shielding material screened respectively are processed into finished cables, and due to the fact that the matching factor is not considered, there is still a large difference between the actual performance of the designed cable and the target performance requirement, therefore, improvement is urgently needed.

[0065] In one embodiment, as Figure 2 shown, a method for evaluating the insulation-shielding matching of high-voltage alternating current cable is provided, which is applied to the server 104 in Figure 1 for example, including the following steps:

[0066] S201, obtaining a target insulation sample, and each shielding sample and each target composite sample corresponding to the target insulation sample.

[0067] The target insulation sample is any one of a plurality of insulation samples to be tested, for example, insulation sample A to be tested, insulation sample B to be tested, insulation sample to be tested, etc. The number of each type of insulation sample to be tested can be at least one, so the number of target insulation samples can be at least one.

[0068] Correspondingly, each shielding sample refers to a sample that needs to be matched with the target insulation sample during the evaluation test, for example, shielding sample 1, shielding sample 2, shielding sample 3, etc.

[0069] Each target composite sample is prepared by compounding the target insulation material with each shielding material, and the target composite sample can be made by a flat plate hot pressing method and placed at 60°C for at least 8h. Taking the target insulation sample to be tested as an example, the target insulation sample A, each target composite sample can be: target composite sample 1# (target insulation sample + shielding sample 1), target composite sample 2# (target insulation sample + shielding sample 2), target composite sample 3# (target insulation sample + shielding sample 3), etc.

[0070] Specifically, during the interface matching performance test, each sample corresponds to a unique number, the server 104 obtains the sample number corresponding to the target insulation sample, for example, number A, which is equivalent to obtaining the target insulation sample A; the server 104 obtains the number of each shielding sample, for example, 1, 2, 3, which is equivalent to obtaining each shielding sample corresponding to the target sample; the server 104 obtains the number of each target composite sample, for example, 1#, 2#, 3#, which is equivalent to obtaining each target composite sample corresponding to the target sample.

[0071] S202, the first performance test of the target insulation sample and each shielding sample is performed by the first device respectively, and the first performance result is obtained.

[0072] The first performance test includes at least thermal expansion performance test, and the first device can be a thermal dilatometer.

[0073] Specifically, when performing the first performance test on each sample (target insulation sample and each shielding sample), the server 104 sends the number of each sample to the first device, and the first device performs the first performance test on each sample in turn according to the number, and outputs the test result of the sample. The test result can be the thermal expansion coefficient or other related parameters. The server 104 receives each test result and determines the first performance result according to each test result.

[0074] The thermal expansion and contraction is a material inherent property, which is generally described by a thermal expansion coefficient (including linear thermal expansion coefficient, surface thermal expansion coefficient and volume thermal expansion coefficient) or a deformation amount of a sample. The thermal expansion coefficient of the same material at different temperatures is not fixed, but changes with temperature. It can be understood that the lower the thermal expansion coefficient, the better the thermal shock resistance of the finished cable, and the more suitable for working environments with large alternating temperature differences. At the same time, if the difference between the thermal expansion performance of the shielding sample and the target insulation sample is smaller (more similar), the composite sample after combination has better thermal expansion performance, which can reduce the damage of thermal residual stress caused by thermal cycling and prevent defects such as deformation of the cable shielding-insulation interface and micro-pores in the internal; correspondingly, if the difference between the thermal expansion performance of the shielding sample and the target insulation sample is larger (not similar), the thermal expansion performance of the composite sample after combination is weaker.

[0075] Specifically, during the thermal expansion test, according to the test requirements, the sample can be a cylinder with a diameter of 6 mm and a height of 20 mm, that is, each target insulation sample and each shielding sample selected is prepared into a cylindrical shape with a diameter of 6 mm and a height of 20 mm.

[0076] In one implementation manner, the first performance result can be the test result of the target insulation sample and each shielding sample; in another implementation manner, the first performance result can also be an evaluation result obtained by further analyzing the above test results, that is, a shielding sample (shielding material) whose difference in thermal expansion performance with the target insulation sample meets the first condition (for example, the difference is less than a preset difference value).

[0077] S203, performing a second performance test on each target composite sample by the second device to obtain a second performance result.

[0078] Specifically, when performing the second performance test on each target composite sample, the server 104 sends the number of each sample to the second device, the second device performs the second performance test on each sample in sequence according to the number, and outputs the test result of the sample, and the server 104 receives each test result and determines the second performance result according to each test result.

[0079] The second performance test at least includes a breakdown performance test. The breakdown performance (breakdown strength) is the limit ability of a dielectric material to maintain an insulating state under the action of electric field and other factors, and the breakdown performance can be represented by data such as breakdown field strength, breakdown time, shape parameter and size parameter.

[0080] In an implementation, the second performance test only includes the breakdown performance test. In another implementation, the second performance test can include the tear strength test in addition to the breakdown performance test, where the tear strength reflects the bonding strength at the interface between the shielding material and the insulating material.

[0081] If the second performance test only includes the breakdown performance test, the second device is a breakdown tester, and in an implementation, the second performance result includes the breakdown performance corresponding to each target composite sample. In another implementation, the second performance result can further include the composite sample satisfying the second condition after further analysis of the breakdown performance corresponding to each target composite sample.

[0082] If the second performance test includes the tear strength test and the breakdown performance test, the second device includes a tensile testing machine and a breakdown tester. In an implementation, the second performance result includes the tear strength corresponding to each target composite sample and the breakdown performance corresponding to each target composite sample. In another implementation, the second performance result can further include the composite sample satisfying the second condition after further analysis of the tear strength corresponding to each target composite sample and the breakdown performance corresponding to each target composite sample, where the second condition means that the composite sample satisfies the preset tear strength and the preset breakdown performance.

[0083] S204, selecting a target shielding material matching the target insulating sample from the shielding materials according to the first performance result and the second performance result.

[0084] Specifically, the server 104 can filter out, according to the first performance result, a shielding sample (corresponding to a shielding material) matching the target insulating sample in the dimension of thermal expansion performance and satisfying the first condition in matching performance. According to the second performance result, the server 104 can filter out a target composite sample (corresponding to a shielding material) matching the target insulating sample in the dimension of tear strength and / or breakdown performance and satisfying the second condition in matching performance. Then, the server 104 takes the shielding material satisfying the first condition and the second condition as the target shielding material matching the target insulating sample. In this case, the matching performance of the shielding material obtained through the above filtering is closer to the actual use condition.

[0085] In the above-mentioned method for evaluating the insulation-shielding matching of high-voltage AC cables, when testing the matching performance of each shielding material with the target insulation material, a first performance test is performed on each obtained shielding sample to obtain a first performance result in the thermal expansion performance dimension; a second performance test is performed on each target composite sample to obtain a second performance result that includes at least the breakdown performance dimension; based on the first and second performance results, the compatibility between each shielding material and the target insulation material is analyzed from multiple dimensions, thereby selecting the target shielding material that matches the target insulation material, which improves the accuracy of cable performance evaluation during the research and development process.

[0086] In one embodiment, such as Figure 3 As shown, this embodiment provides an optional method for performing a first performance test on the target insulation sample and each shielding sample using a first device to obtain a first performance result, i.e., a method for refining S202. The specific implementation process may include:

[0087] S301, the thermal expansion performance of the target insulation sample and each shielding sample is tested by the first device to obtain the target performance curve corresponding to the target insulation sample and the test performance curve corresponding to each shielding sample.

[0088] The target performance curve includes at least one of a thermal expansion coefficient curve and a deformation curve. The thermal expansion coefficient curve is a curve showing how the thermal expansion coefficient changes with temperature, such as... Figure 4 The thermal expansion coefficient curves of the target insulation specimen and each shielding specimen (1, 2, 3) are shown; the deformation curve is the curve of the specimen's deformation changing with temperature, such as... Figure 5 The deformation curves of the target insulation specimen and each shielding specimen (1, 2, 3) are shown.

[0089] Optionally, the deformation of the specimen is characterized by relative elongation, since if an object of length L is heated and its temperature is uniformly increased from T0 to T1, the object will undergo a corresponding free expansion along its length based on the coefficient of thermal expansion. (Relative elongation).

[0090] S302, determine the first performance result based on the target performance curve and each test performance curve.

[0091] As in the example above, in one possible implementation, the first performance result can be the thermal expansion coefficient curve of the target insulation specimen and the thermal expansion coefficient curves of each shielding specimen; or the deformation curve of the target insulation specimen and the deformation curves of each shielding specimen.

[0092] In another implementation, determining the first performance result can further include the following processes: (1) for any shielding sample, calculating a thermal expansion difference value between the thermal expansion coefficient curve of the shielding sample and the thermal expansion coefficient curve of the target insulation sample; wherein the thermal expansion difference value can be determined by at least one of the following: a difference between the highest point of the thermal expansion coefficient, a difference between the median value of the thermal expansion coefficient, a difference between the lowest point of the thermal expansion coefficient, and a difference between the trend change of the thermal expansion coefficient. (2) according to the thermal expansion difference value, determining the shielding sample corresponding to the thermal expansion coefficient curve satisfying the first sub-condition; wherein the first sub-condition includes that the thermal expansion difference value is less than a first difference threshold, and the thermal expansion coefficient of the shielding sample corresponding to the thermal expansion difference value is lower than a first target threshold. (3) for any shielding sample, calculating a deformation variable difference value between the deformation variable coefficient curve of the shielding sample and the deformation variable coefficient curve of the target insulation sample; wherein the deformation variable difference value can be determined by at least one of the following: a difference between the highest point of the deformation variable coefficient, a difference between the median value of the deformation variable coefficient, a difference between the lowest point of the deformation variable coefficient, and a difference between the trend change of the deformation variable coefficient. (4) according to the deformation variable difference value, determining the shielding sample corresponding to the deformation variable coefficient curve satisfying the second sub-condition; wherein the second sub-condition includes that the deformation variable difference value is less than a second difference threshold. (5) determining the shielding sample satisfying the first sub-condition and the second sub-condition as the shielding sample satisfying the first condition.

[0093] In this embodiment, by generating the target performance curve corresponding to the target insulation sample and the test performance curve corresponding to each shielding sample, the test performance curve (corresponding shielding sample) satisfying the first condition is determined, so that the difference between the thermal expansion performance of the shielding sample and the thermal expansion performance of the target insulation sample is smaller (satisfies the first condition), thereby improving the thermal expansion performance of the combined cable.

[0094] The above-mentioned manner of calculating the difference value between the target performance curve and each test performance curve includes multiple forms. In this embodiment, in order to accurately compare the target performance curve and each test performance curve, as shown in FIG. 6, an optional manner of determining the first performance result according to the target performance curve and each test performance curve is provided, that is, the refinement of S502, which can include the following processes: Figure 6

[0095] S601, determining the trend similarity between each test performance curve and the target performance curve.

[0096] ​In an implementation, the server 104 receives each test performance curve output by the first device and the target performance curve, and when calculating the trend similarity between any test performance curve and the target performance curve, the single-point difference value between the value corresponding to each temperature on the test performance curve and the value on the target performance curve can be calculated on the horizontal axis (temperature), and based on the plurality of single-point difference values, the trend similarity between the test performance curve and the target performance curve is determined.

[0097] In another implementation, the test performance curve and the target performance curve can also be input into a preset neural network model to obtain a similarity result output by the neural network model.

[0098] S602, determining the first performance result according to each trend similarity.

[0099] Specifically, the shielding sample corresponding to the test performance curve that satisfies the first condition with the target performance curve is determined as the first performance result. The number of shielding samples that satisfy the first condition is at least one.

[0100] In this embodiment, by comparing the trend similarities of the target performance curve and each test performance curve, the shielding sample with better matching performance to the target insulation sample can be determined.

[0101] If the second performance test includes breakdown performance test, in one embodiment, as shown in FIG. 8, the present embodiment provides an optional way of performing second performance test on each target composite sample by the second device to obtain a second test result, that is, a way of refining S202. The specific implementation process can include: Figure 7

[0102] S701, determining at least one first composite sample from each target composite sample.

[0103] The server 104 randomly selects a preset number of first composite samples from the numbers of target composite samples without replacement. Optionally, the number of selected first composite samples is at least one, and is only used for breakdown performance test.

[0104] S702, performing breakdown performance test on the target insulation sample and each first composite sample by the second device to obtain the target breakdown performance corresponding to the target insulation sample and the test breakdown performance corresponding to each first composite sample.

[0105] Wherein, the breakdown performance is represented by breakdown field strength.

[0106] ​The server 104 sends the numbers of the first composite samples to the second device, and the second device performs breakdown performance tests on the first composite samples one by one according to the corresponding numbers. For any first composite sample, the test process is as follows: a square first composite sample with a side length of 100 mm and a thickness of 0.5 mm is used; the voltage rising rate of the breakdown field strength in the second device is 1 kV / s, a ball-ball electrode with a diameter of 20 mm is used, and 20 effective breakdown field strengths are obtained for the first composite sample, wherein the ratio of the breakdown voltage (AC) to the sample thickness is the breakdown field strength (AC) of the sample.

[0107] Then, the server 104 statistically analyzes the test results (the breakdown field strengths) by using a Weibull distribution function, with a confidence level of 95%, to calculate the scale parameter and the shape parameter corresponding to each breakdown field strength. The target breakdown performance corresponding to the target insulation sample and the test breakdown performance corresponding to each first composite sample are shown in Table 1 as follows:

[0108] Table 1

[0109] Test sample Scale parameter Shape parameter First composite test sample 1 72.3 11.7 First composite test sample 2 70.7 12.7 First composite test sample 3 74.4 11.3 Target insulation test sample 78.5 22.4

[0110] S703, according to the target breakdown performance and the test breakdown performance, determine the second performance result.

[0111] If the second performance test only includes the breakdown performance test, the second condition in S203 is determined as a third sub-condition, which means that the breakdown performance of the tested sample is higher than the preset breakdown performance.

[0112] The server 104 determines the test breakdown performance corresponding to each first composite sample, and based on the target breakdown performance corresponding to the target insulation sample, determines the first composite sample whose breakdown performance satisfies the third sub-condition as the second performance result.

[0113] Specifically, in Table 1, the breakdown field strengths of the composite samples with shielding layers are all reduced to different degrees compared with the target insulation sample. The breakdown field strength of the composite sample 1# is 74.4 kV / mm, which has the lowest degree of reduction; the breakdown field strength of the composite sample 2# is 72.3 kV / mm; and the breakdown field strength of the composite sample 3# is 70.7 kV / mm, which has the highest degree of reduction. That is, the electrical strength of the composite sample after the shielding layer and the insulation layer are combined presents a downward trend, but the breakdown field strength of the composite sample 1# has a small degree of reduction compared with the target insulation sample, which indicates that the shielding layer and the target insulation layer have good matching property; the composite sample 3# has the lowest degree of reduction, which indicates that the interface electrical matching property of the shielding layer and the target insulation layer is the best, and the breakdown performance of the composite sample 3# is better than that of the composite samples 1# and 2#, so the composite sample 3# is determined as the composite sample whose breakdown performance satisfies the third sub-condition.

[0114] The reason for the decrease of the breakdown field strength of the composite sample with the shielding layer compared to the target insulating sample may be that the addition of the shielding layer in the sample preparation process introduces impurities to the insulating-shielding interface inside the sample and the edge effect of the upper and lower shielding layers. In addition, the law of the alternating current electrical strength of the insulating layer and the shielding-insulating composite sample with temperature can be further studied, and the breakdown performance of the shielding-insulating composite sample under various temperature conditions can be tested.

[0115] In this embodiment, the matching performance between the insulating layer and the shielding layer in the composite sample is measured in the breakdown performance dimension by testing the breakdown performance of the first composite sample, thereby improving the accuracy of the cable evaluation.

[0116] The interface between the shielding layer and the insulating layer may have insufficient bonding strength due to the presence of air gaps. The tear resistance test is to test the stress required for tearing at the interface under the action of two opposite forces. In fact, this is related to the different tearing characteristics of the interface, and the maximum stress often occurs at several bonding points at the interface. During the tearing process, there may be several tearing conditions: ① tearing along the interface, the overall sample has no bonding point with strong bonding strength at the interface; ② the interface is difficult to tear, and the insulating layer or the semiconductive layer is disconnected from the side; ③ the bonding strength of individual bonding points is not high, and the interface is torn when the bonding point is disconnected, until the next bonding point is reached. This is because the smaller the interaction force between the conductive carbon black in the shielding layer and the matrix and the interchain force of the insulating material, the greater the impact on the mechanical properties of the insulating material and the semiconductive material. The interfacial bonding force between the materials is weakened, so it tends to tear directly at the interface. During the operation of the cable, the interface between the insulating layer and the shielding layer is more prone to tearing, which poses a hidden danger to the safe operation of the cable and the joint. Therefore, it is necessary to test the tear resistance of the composite sample after the shielding layer and the insulating layer are combined.

[0117] That is, if the second performance test includes the tear resistance test, the corresponding in one embodiment, as shown in Figure 8 The embodiment also provides an optional way of determining the second performance result according to the target breakdown performance and the test breakdown performance, that is, the refinement process of S203, which can specifically include the following processes:

[0118] S801, determining at least one second composite sample from each target composite sample.

[0119] The server 104 randomly and without replacement draws a corresponding number of second composite samples from the target composite samples according to the numbers. The number of second composite samples is at least one, the second composite sample can be a target composite sample of the same model but different number as the first composite sample, and is only used for performing the tear resistance strength test. In the embodiment, the second composite sample is a 100 mm thick pant-type sample, and the second composite sample has an opening at the interface between the insulating layer and the shielding layer (the opening depth is 40 mm).

[0120] S802, performing a tear resistance strength test on each second composite sample by the second device to obtain a corresponding test tear resistance strength.

[0121] The second device is a tensile testing machine, and the tear resistance strength T=F / d, where F is the tensile force applied when tearing the sample, and d is the thickness of the sample. When calculating the tear resistance strength, the second device first calculates the thickness d of the second composite sample. When the second composite sample is a pant-type sample, the median value should be taken according to the provisions of GB / T12833 to measure the thickness d of the sample. According to the provisions of GB / T2941, the thickness measurement of the sample should be performed in the tearing area of the sample, and the thickness should be measured at not less than three points to take the median value.

[0122] For any second composite sample, the second device tests the tear resistance strength of the interface between the insulating layer and the shielding layer of the target composite sample, and specifically includes the following process: the second device refers to the standard GBT 529-2008 to perform the test at a standard temperature of (23±2)℃ or (27±2)℃, the stretching rate is 100 mm / min, and the second device applies a tensile force F to the second composite sample. Then, when calculating the tear strength of the sample, the median value, the maximum value and the minimum value of the tear strength of the sample are collectively represented, and the numerical value is accurate to the integer place.

[0123] In addition, if the test needs to be performed at other temperatures, the sample should be placed at the temperature for sufficient adjustment before the test to make the sample and the environment temperature reach equilibrium. In order to make the test results comparable, the entire process of any one test or a series of tests should be performed at the same temperature. At least 5 effective data of each group of samples are measured, and finally the tear resistance strength is calculated according to the test results.

[0124] S803, determining the second performance result according to the test tear resistance strength, the target breakdown performance and the test breakdown performance.

[0125] If the second performance test includes the breakdown performance test and the tear resistance test, the second condition in S203 is a third sub-condition and a fourth sub-condition, and the fourth sub-condition refers to the tear resistance of the composite sample being greater than a preset tear resistance. The server 104 determines the composite sample satisfying the third sub-condition and the fourth sub-condition as the composite sample satisfying the second condition, i.e., the second performance result.

[0126] In this embodiment, the tear resistance of the second composite sample is tested to measure the matching performance between the insulation layer and the shielding layer in the composite sample in the dimension of the tear resistance, and the composite sample satisfying the preset tear resistance and the preset breakdown performance is screened out, thereby improving the accuracy of the cable evaluation.

[0127] In one embodiment, as shown in FIG. 2, the present embodiment further provides an optional manner of performing the second performance test on each target composite sample by the second device to obtain the second performance result, i.e., the refinement process of S203, which can include the following processes: Figure 9

[0128] S901, determining at least one third composite sample from each target composite sample.

[0129] The server 104 selects a corresponding number of third composite samples (numbers) from the numbers of the target composite samples, wherein the number of the third composite samples is at least two. If the second performance test is the breakdown performance test, the third composite sample is a sample with the same model and parameters as the first composite sample. If the second performance test is the tear resistance test, the third composite sample is a sample with the same model and parameters as the second composite sample. If the second performance test includes the breakdown performance test and the tear resistance test, the third composite sample includes a first group and a second group. The sample in the first group is a sample with the same model and parameters as the first composite sample, and the sample in the second group is a sample with the same model and parameters as the second composite sample.

[0130] S902, performing a cooling cycle test on each third composite sample by a third device to obtain the third composite sample after the cooling cycle test.

[0131] The third device is a constant temperature and humidity test chamber, and the server 104 sends the numbers of the third composite samples to the third device to control the third device to perform the cooling cycle test on the third composite sample. Before the test, one end of the third composite sample is clamped in the constant temperature and humidity test chamber to ensure uniform heating.

[0132] ​The process of the third device in the cold and hot cycle test is as follows: After the third device is placed, a cold and hot cycle is performed in 24 hours. The highest temperature point is set at 70℃ and the heat preservation time at the highest temperature is 8 hours. The lowest temperature point is set at -30℃ and the heat preservation time at the lowest temperature is 16 hours. Three cold and hot cycle cycles are performed.

[0133] S903, the second performance test is performed on the third composite sample after the cooling cycle test using the second device to obtain the second performance result.

[0134] In this process, the third composite sample after the cold and heat cycle post-treatment is taken out of the constant temperature and humidity test chamber, and the steps in S701~S702 and / or S801~S802 are repeated. The server 104 obtains the test tear strength and / or the corresponding test breakdown performance of the third composite sample after the cold and heat cycle post-treatment.

[0135] Specifically, taking the second performance test, which includes a breakdown performance test and a tear strength test, as an example, the server 104 compares the breakdown performance of the sample in the first group with the breakdown performance of the first composite sample to determine the breakdown performance difference; compares the breakdown performance of the sample in the second group with the tear strength of the second composite sample to determine the tear strength difference; and determines the breakdown performance difference and the tear strength difference as the second performance result; or, the third composite sample with the smaller breakdown performance difference and / or tear strength difference is determined as the second performance result.

[0136] In this embodiment, a second performance test is conducted on the third composite sample after thermal cycling to simulate the actual operating conditions of the cable and further determine the matching performance between the shielding layer and the insulation layer in the composite sample.

[0137] For example, based on the above embodiments, this embodiment provides an optional example of a method for evaluating the insulation-shielding matching of high-voltage AC cables. For instance... Figure 10 As shown, the specific implementation process includes:

[0138] S1001, Obtain the target insulation sample, as well as each shielding sample and each target composite sample corresponding to the target insulation sample;

[0139] Each target composite sample is prepared by combining the target insulating material with each shielding material respectively;

[0140] S1002, The thermal expansion performance of the target insulation sample and each shielding sample is tested by the first device to obtain the target performance curve corresponding to the target insulation sample and the test performance curve corresponding to each shielding sample.

[0141] S1003, determine a trend similarity of each test performance curve to the target performance curve; determine the first performance result according to each trend similarity.

[0142] S1004, determine at least one first composite sample from each target composite sample;

[0143] S1005, perform breakdown performance tests on the target insulation sample and each first composite sample by the second device to obtain a target breakdown performance corresponding to the target insulation sample and a test breakdown performance corresponding to each first composite sample;

[0144] S1006, perform a second performance test on each target composite sample by the second device to obtain a second performance result; wherein the second performance test at least includes the breakdown performance test.

[0145] Wherein, at least one first composite sample is determined from each target composite sample; the breakdown performance tests are performed on the target insulation sample and each first composite sample by the second device to obtain a target breakdown performance corresponding to the target insulation sample and a test breakdown performance corresponding to each first composite sample; and the second performance result is determined according to the target breakdown performance and the test breakdown performance.

[0146] Wherein, at least one second composite sample is determined from each target composite sample; the tear resistance strength tests are performed on each second composite sample by the second device to obtain a corresponding test tear resistance strength; and the second performance result is determined according to each test tear resistance strength, the target breakdown performance and the test breakdown performance.

[0147] Wherein, at least one third composite sample is determined from each target composite sample; the cooling cycle tests are performed on each third composite sample by the third device to obtain a third composite sample after the cooling cycle test; and the second performance test is performed on the third composite sample after the cooling cycle test by the second device to obtain the second performance result.

[0148] S1007, select a target shielding material matched with the target insulation sample from each shielding material according to the first performance result and the second performance result.

[0149] The specific processes of S1001-S1007 can refer to the descriptions of the method embodiments, and the implementation principles and technical effects are similar, which will not be repeated here.

[0150] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other sequences. Moreover, at least some of the steps in the flowcharts involved in the above embodiments can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of the steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0151] Based on the same inventive concept, the embodiments of the present application also provide a device for evaluating the insulation-screen matching of high-voltage AC cables for implementing the above-mentioned method for evaluating the insulation-screen matching of high-voltage AC cables. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more device embodiments for evaluating the insulation-screen matching of high-voltage AC cables provided below can be referred to the limitations of the method for evaluating the insulation-screen matching of high-voltage AC cables described above, which will not be repeated here.

[0152] In one embodiment, as shown in Figure 11 A device 1 for evaluating the insulation-screen matching of high-voltage AC cables is provided, comprising: an acquisition module 11, a first test module 12, a second test module 13 and a matching module 14, wherein:

[0153] The acquisition module 11 is configured to acquire a target insulation sample, and respective shielding samples and respective target composite samples corresponding to the target insulation sample; wherein each target composite sample is prepared by compounding the target insulation material with each shielding material, respectively;

[0154] The first test module 12 is configured to perform first performance tests on the target insulation sample and each shielding sample by a first device, respectively, to obtain first performance results; wherein the first performance tests at least include thermal expansion performance tests;

[0155] The second test module 13 is configured to perform second performance tests on each target composite sample by a second device to obtain second performance results; wherein the second performance tests at least include breakdown performance tests;

[0156] The matching module 14 is configured to select a target shielding material matched with the target insulation sample from the respective shielding materials according to the first performance results and the second performance results.

[0157] In one embodiment, the first testing module 12 comprises:

[0158] The analysis submodule is configured to perform thermal expansion performance tests on the target insulation sample and each shielding sample respectively by the first device, to obtain a target performance curve corresponding to the target insulation sample and a test performance curve corresponding to each shielding sample.

[0159] The determination submodule is configured to determine the first performance result according to the target performance curve and each test performance curve.

[0160] In one embodiment, the analysis submodule is further configured to determine a trend similarity between each test performance curve and the target performance curve, and determine the first performance result according to each trend similarity.

[0161] In one embodiment, the second testing module 13 comprises:

[0162] The first screening submodule is configured to determine at least one first composite sample from each target composite sample.

[0163] The breakdown test submodule is configured to perform breakdown performance tests on the target insulation sample and each first composite sample by the second device, to obtain a target breakdown performance corresponding to the target insulation sample and a test breakdown performance corresponding to each first composite sample.

[0164] The breakdown performance submodule is configured to determine the second performance result according to the target breakdown performance and the test breakdown performance.

[0165] In one embodiment, the second testing module 13 comprises:

[0166] The second screening submodule is configured to determine at least one second composite sample from each target composite sample.

[0167] The tear resistance test submodule is configured to perform tear resistance strength tests on each second composite sample by the second device, to obtain a corresponding test tear resistance strength.

[0168] The tear resistance strength submodule is configured to determine the second performance result according to each test tear resistance strength.

[0169] In one embodiment, the second testing module 13 comprises:

[0170] The third screening submodule is configured to determine at least one third composite sample from each target composite sample.

[0171] The cooling cycle submodule is configured to perform cooling cycle tests on each third composite sample by the third device, to obtain a third composite sample after the cooling cycle test.

[0172] The verification submodule is configured to perform a second performance test on the third composite sample after the cooling cycle test by the second device to obtain a second performance result.

[0173] The modules in the device for evaluating the insulation-screen matching of high-voltage AC cables can be implemented by software, hardware, or a combination thereof. The modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a memory in the computer device in software form, so that the processor can call and execute the operations corresponding to the modules.

[0174] In one embodiment, a computer device, which can be a server, is provided. An internal structure diagram of the computer device can be as shown in Figure 12 The computer device includes a processor, a memory, and a network interface connected by a system bus. The processor of the computer device is configured to provide computing and processing capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for running the operating system and the computer program in the non-volatile storage medium. The database of the computer device is configured to store data for a method for evaluating the insulation-screen matching of high-voltage AC cables. The network interface of the computer device is configured to communicate with an external terminal through a network connection. The computer program, when executed by the processor, implements a method for evaluating the insulation-screen matching of high-voltage AC cables.

[0175] Those skilled in the art can understand that Figure 12 The structure shown in the above figure is only a block diagram of part of the structure related to the scheme of the present application, and does not limit the computer device to which the scheme of the present application is applied. Specifically, the computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0176] In one embodiment, a computer device is provided, which includes a memory and a processor. The memory stores a computer program. The processor, when executing the computer program, implements the following steps:

[0177] Obtaining a target insulation sample, and target shielding samples and target composite samples corresponding to the target insulation sample. Each target composite sample is prepared by compounding the target insulation material with each shielding material.

[0178] Performing a first performance test on the target insulation sample and each shielding sample by a first device to obtain a first performance result. The first performance test at least includes a thermal expansion performance test.

[0179] The second performance test is at least a breakdown performance test.

[0180] The target shielding material matched with the target insulation sample is selected from the shielding materials according to the first performance result and the second performance result.

[0181] In one embodiment, when the processor executes the computer program to perform the logic of performing the first performance test on the target insulation sample and each shielding sample by the first device to obtain the first performance result, the following steps are implemented: performing a thermal expansion performance test on the target insulation sample and each shielding sample by the first device to obtain a target performance curve corresponding to the target insulation sample and a test performance curve corresponding to each shielding sample; and determining the first performance result according to the target performance curve and each test performance curve.

[0182] In one embodiment, when the processor executes the computer program to perform the logic of determining the first performance result according to the target performance curve and each test performance curve, the following steps are implemented: determining a trend similarity of each test performance curve to the target performance curve; and determining the first performance result according to each trend similarity.

[0183] In one embodiment, when the processor executes the computer program to perform the logic of performing the second performance test on each target composite sample by the second device to obtain the second performance result, the following steps are implemented: determining at least one first composite sample from each target composite sample; performing a breakdown performance test on the target insulation sample and each first composite sample by the second device to obtain a target breakdown performance corresponding to the target insulation sample and a test breakdown performance corresponding to each first composite sample; and determining the second performance result according to the target breakdown performance and the test breakdown performance.

[0184] In one embodiment, when the processor executes the computer program to perform the logic of performing the second performance test on each target composite sample by the second device to obtain the second performance result, the following steps are implemented: determining at least one second composite sample from each target composite sample; performing a tear strength test on each second composite sample by the second device to obtain a test tear strength corresponding to each second composite sample; and determining the second performance result according to each test tear strength.

[0185] In one embodiment, the logic of the computer program executed by the processor to perform the second performance test on each target composite sample by the second device to obtain the second test result specifically implements the following steps: determining at least one third composite sample from each target composite sample; performing a cooling cycle test on each third composite sample by a third device to obtain the third composite sample after the cooling cycle test; performing the second performance test on the third composite sample after the cooling cycle test by the second device to obtain the second performance result.

[0186] In one embodiment, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the following steps:

[0187] obtaining a target insulation sample, and each shielding sample and each target composite sample corresponding to the target insulation sample; wherein each target composite sample is prepared by compounding the target insulation material with each shielding material, respectively;

[0188] performing a first performance test on the target insulation sample and each shielding sample by a first device, respectively, to obtain a first performance result; wherein the first performance test at least includes a thermal expansion performance test;

[0189] performing a second performance test on each target composite sample by a second device to obtain a second performance result; wherein the second performance test at least includes a breakdown performance test;

[0190] selecting a target shielding material matched with the target insulation sample from each shielding material according to the first performance result and the second performance result.

[0191] In one embodiment, the logic of the computer program executed by the processor to perform the first performance test on the target insulation sample and each shielding sample by the first device to obtain the first performance result specifically implements the following steps: performing a thermal expansion performance test on the target insulation sample and each shielding sample by the first device, respectively, to obtain a target performance curve corresponding to the target insulation sample and a test performance curve corresponding to each shielding sample; and determining the first performance result according to the target performance curve and each test performance curve.

[0192] In one embodiment, the logic of the computer program executed by the processor to determine the first performance result according to the target performance curve and each test performance curve specifically implements the following steps: determining a trend similarity of each test performance curve to the target performance curve; and determining the first performance result according to each trend similarity.

[0193] In one embodiment, the logic of the computer program for performing the second performance test on each target composite sample by the second device to obtain the second performance result is implemented by the processor when executed to perform the following steps: determining at least one first composite sample from each target composite sample; performing a breakdown performance test on the target insulation sample and each first composite sample by the second device to obtain a target breakdown performance corresponding to the target insulation sample and a test breakdown performance corresponding to each first composite sample; and determining the second performance result according to the target breakdown performance and the test breakdown performance.

[0194] In one embodiment, the logic of the computer program for performing the second performance test on each target composite sample by the second device to obtain the second performance result is implemented by the processor when executed to perform the following steps: determining at least one second composite sample from each target composite sample; performing a tear strength test on each second composite sample by the second device to obtain a corresponding test tear strength; and determining the second performance result according to each test tear strength.

[0195] In one embodiment, the logic of the computer program for performing the second performance test on each target composite sample by the second device to obtain the second performance result is implemented by the processor when executed to perform the following steps: determining at least one third composite sample from each target composite sample; performing a cooling cycle test on each third composite sample by the third device to obtain a third composite sample after the cooling cycle test; and performing the second performance test on the third composite sample after the cooling cycle test by the second device to obtain the second performance result.

[0196] In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the following steps:

[0197] obtaining a target insulation sample, and each shielding sample and each target composite sample corresponding to the target insulation sample; wherein each target composite sample is prepared by compounding the target insulation material with each shielding material, respectively;

[0198] performing a first performance test on the target insulation sample and each shielding sample by a first device to obtain a first performance result; wherein the first performance test at least includes a thermal expansion performance test;

[0199] performing a second performance test on each target composite sample by a second device to obtain a second performance result; wherein the second performance test at least includes a breakdown performance test;

[0200] selecting a target shielding material matched with the target insulation sample from each shielding material according to the first performance result and the second performance result.

[0201] In one embodiment, the logic of the computer program for performing the first performance test on the target insulation sample and each shielding sample respectively by the first device to obtain the first performance result is implemented by the processor to perform the following steps: performing thermal expansion performance test on the target insulation sample and each shielding sample respectively by the first device to obtain a target performance curve corresponding to the target insulation sample and a test performance curve corresponding to each shielding sample; and determining the first performance result according to the target performance curve and each test performance curve.

[0202] In one embodiment, the logic of the computer program for determining the first performance result according to the target performance curve and each test performance curve is implemented by the processor to perform the following steps: determining a trend similarity of each test performance curve to the target performance curve; and determining the first performance result according to each trend similarity.

[0203] In one embodiment, the logic of the computer program for performing the second performance test on each target composite sample by the second device to obtain the second test result is implemented by the processor to perform the following steps: determining at least one first composite sample from each target composite sample; performing breakdown performance test on the target insulation sample and each first composite sample by the second device to obtain a target breakdown performance corresponding to the target insulation sample and a test breakdown performance corresponding to each first composite sample; and determining the second performance result according to the target breakdown performance and the test breakdown performance.

[0204] In one embodiment, the logic of the computer program for performing the second performance test on each target composite sample by the second device to obtain the second performance result is implemented by the processor to perform the following steps: determining at least one second composite sample from each target composite sample; performing tear resistance strength test on each second composite sample by the second device to obtain a corresponding test tear resistance strength; and determining the second performance result according to each test tear resistance strength.

[0205] In one embodiment, the logic of the computer program for performing the second performance test on each target composite sample by the second device to obtain the second performance result is implemented by the processor to perform the following steps: determining at least one third composite sample from each target composite sample; performing cooling cycle test on each third composite sample by the third device to obtain a third composite sample after the cooling cycle test; and performing the second performance test on the third composite sample after the cooling cycle test by the second device to obtain the second performance result.

[0206] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties.

[0207] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0208] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0209] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for evaluating the insulation-shielding matching of high-voltage AC cables, characterized in that, The method includes: Obtain a target insulation sample, as well as corresponding shielding samples and target composite samples; wherein, each target composite sample is prepared by combining the target insulation material with each shielding material respectively; The first device is used to perform a first performance test on the target insulation sample and each shielding sample to obtain a first performance result; wherein the first performance test includes at least a thermal expansion performance test. A second performance test is performed on each target composite sample using a second device to obtain a second performance result; wherein the second performance test includes at least a breakdown performance test; Based on the first performance result and the second performance result, a target shielding material that matches the target insulation sample is selected from among the various shielding materials.

2. The method according to claim 1, characterized in that, The first performance test, performed on the target insulation sample and each shielding sample using the first device to obtain the first performance result, includes: The thermal expansion performance of the target insulation sample and each shielding sample is tested by the first device to obtain the target performance curve corresponding to the target insulation sample and the test performance curve corresponding to each shielding sample. The first performance result is determined based on the target performance curve and each test performance curve.

3. The method according to claim 2, characterized in that, The step of determining the first performance result based on the target performance curve and each test performance curve includes: Determine the trend similarity between each test performance curve and the target performance curve; The first performance result is determined based on the similarity of each trend.

4. The method according to claim 1, characterized in that, The second performance test performed on each target composite sample using a second device to obtain the second test results includes: At least one first composite specimen is determined from each target composite specimen; The second device is used to perform breakdown performance tests on the target insulation sample and each of the first composite samples to obtain the target breakdown performance corresponding to the target insulation sample and the test breakdown performance corresponding to each of the first composite samples. The second performance result is determined based on the target breakdown performance and the test breakdown performance.

5. The method according to claim 4, characterized in that, The step of determining the second performance result based on the target breakdown performance and the test breakdown performance includes: Determine at least one second composite specimen from each of the target composite specimens; The tear strength of each second composite sample is tested using the second device to obtain the corresponding tear strength. The second performance result is determined based on the tear strength of each test, the target breakdown performance, and the test breakdown performance.

6. The method according to claim 1, characterized in that, The second performance test performed on each target composite sample using a second device to obtain the second performance results includes: Determine at least one third composite specimen from each of the target composite specimens; The third composite sample was subjected to a cooling cycle test using a third device to obtain the third composite sample after the cooling cycle test. The second performance test is performed on the third composite sample after the cooling cycle test using the second device to obtain the second performance result.

7. A device for evaluating the insulation-shielding matching of high-voltage AC cables, characterized in that, The device includes: The acquisition module is used to acquire the target insulation sample, as well as each shielding sample and each target composite sample corresponding to the target insulation sample; wherein, each target composite sample is prepared by combining the target insulation material with each shielding material respectively; The first testing module is used to perform a first performance test on the target insulation sample and each shielding sample respectively using a first device to obtain a first performance result; wherein, the first performance test includes at least a thermal expansion performance test; The second testing module is used to perform a second performance test on each target composite sample using a second device to obtain a second performance result; wherein the second performance test includes at least a breakdown performance test; A matching module is used to select a target shielding material that matches the target insulation sample from among various shielding materials based on the first performance result and the second performance result.

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.

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