Cable insulating material performance evaluation method, system, equipment and medium

Abstract

The invention belongs to the technical field of cable insulation, and discloses a cable insulation material performance evaluation method, system and device and a medium, and the performance evaluation method comprises the steps: carrying out the fitting of frequency domain dielectric spectrums of a polypropylene cable insulation material at different temperatures based on a multi-relaxation dielectric model, and carrying out the calculation of the frequency domain dielectric spectrums of the polypropylene cable insulation material; obtaining characteristic parameters and a direct-current conductive component of the polypropylene cable insulating material according to a fitting result; fitting the characteristic parameters and the direct current conductance component based on a fitting analysis technology, analyzing performance evaluation parameters of the polypropylene cable insulation material, and obtaining a performance evaluation result of the polypropylene cable insulation material according to the performance evaluation parameters. Compared with a traditional cable insulation performance detection method, the frequency domain dielectric spectrum method is adopted, experimental operation is greatly simplified, through fitting of dielectric spectrum data and extraction of characteristic parameters, tedious testing and use of various experimental devices are avoided, and detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable insulation, and in particular to a method, system, equipment and medium for evaluating performance of cable insulation materials. Background Art

[0002] Thermoplastic polypropylene cable materials have the advantages of no need for cross-linking, simple process, low energy consumption and recyclability, which meet the current development needs. However, polypropylene cable insulation materials are brittle and have poor impact resistance. Therefore, polypropylene is often mixed with polyolefin elastomers or rubber materials to improve the mechanical properties of polypropylene. However, a large number of interfaces are also introduced, which reduces the electrical properties of polypropylene cable insulation. Therefore, it is necessary to improve the insulation properties of polypropylene materials to meet the requirements of cable operation.

[0003] The main methods for modifying polypropylene cable insulation include inorganic nanocomposites, organic small molecule compounding and organic small molecule chemical grafting. The effects of different modification methods are mainly characterized by various test results such as physical and chemical tests, breakdown field strength tests and volume resistivity tests. The testing process is relatively cumbersome.

[0004] Therefore, how to provide a cable insulation material performance evaluation method, system, equipment and medium is a problem that needs to be solved urgently. Summary of the invention

[0005] The embodiments of the present invention provide a cable insulation material performance evaluation method, system, device and medium to solve the problem that the testing process in the prior art is relatively complicated.

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be a general review, nor is it intended to identify key / important components or to delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0007] According to a first aspect of an embodiment of the present invention, a method for evaluating performance of a cable insulation material is provided.

[0008] In one embodiment, a method for evaluating performance of a cable insulation material comprises:

[0009] Based on the multi-relaxation dielectric model, the frequency domain dielectric spectra of polypropylene cable insulation materials at different temperatures are fitted, and the characteristic parameters and DC conductive components of polypropylene cable insulation materials are obtained according to the fitting results.

[0010] Based on the fitting analysis technology, the characteristic parameters and the DC conductivity components are fitted, the performance evaluation parameters of the polypropylene cable insulation material are analyzed, and the performance evaluation results of the polypropylene cable insulation material are obtained according to the performance evaluation parameters.

[0011] In one embodiment, based on the multi-relaxation dielectric model, the frequency domain dielectric spectra of the polypropylene cable insulation material at different temperatures are fitted, and the characteristic parameters and DC conductive components of the polypropylene cable insulation material are obtained according to the fitting results, including:

[0012] The test temperature and test frequency of the broadband dielectric impedance spectrometer are pre-set, and the polypropylene cable insulation material is tested using the broadband dielectric impedance spectrometer to obtain frequency domain dielectric spectrum data;

[0013] Based on the frequency domain dielectric spectrum data, the frequency domain dielectric spectra of polypropylene cable insulation materials at different temperatures are generated, and the multi-relaxation dielectric model corrected by DC conductivity is used to fit the frequency domain dielectric spectrum.

[0014] Based on the fitting results, the characteristic parameters and DC conductive components of the polypropylene cable insulation material are obtained, and the relaxation process of the polypropylene cable insulation material is analyzed according to the characteristic parameters and DC conductive components.

[0015] In one embodiment, the characteristic parameters of the polypropylene cable insulation material include relaxation strength of a first relaxation process, relaxation strength of a second relaxation process, relaxation time of the first relaxation process, and relaxation time of the second relaxation process.

[0016] In one embodiment, the first relaxation process represents a dipole turning polarization process of the polypropylene cable insulation material, and the second relaxation process represents a carrier hopping polarization process of the polypropylene cable insulation material.

[0017] In one embodiment, the relaxation process of the polypropylene cable insulation material is calculated as follows:

[0018]

[0019] In the formula, ε r represents the complex frequency domain dielectric constant, ε ∞ represents the optical frequency dielectric constant, Δε α With τ α represent the relaxation intensity and relaxation time of the first relaxation process, γ α With β α represents the shape parameter of the first relaxation process, Δε δ With τ δ denote the relaxation intensity and relaxation time of the second relaxation process, γ δ With β δ represents the shape parameter of the second relaxation process, σ represents the DC conductivity, ε0 ​​represents the vacuum dielectric constant, i represents the imaginary unit, and ω represents the angular frequency.

[0020] In one embodiment, the characteristic parameters and the DC conductivity components are fitted based on the fitting analysis technology, the performance evaluation parameters of the polypropylene cable insulation material are analyzed, and the performance evaluation results of the polypropylene cable insulation material are obtained according to the performance evaluation parameters, including:

[0021] The relaxation intensity of the first relaxation process is fitted based on the collective polar behavior fitting technology, and the slope of the first relaxation curve of the polypropylene cable insulation material is obtained according to the fitting result;

[0022] The interaction strength and average dipole moment between dipole molecules in the first relaxation process of polypropylene cable insulation material are analyzed based on the slope of the curve.

[0023] The relaxation time and DC conductivity of the second relaxation process were fitted using curvature fitting technology, and the insulation performance and sensitivity of polypropylene cable insulation materials were analyzed based on the fitting results.

[0024] The interaction strength, insulation performance and sensitivity are used as performance evaluation parameters of polypropylene cable insulation materials, and the performance evaluation results of polypropylene cable insulation materials are obtained based on the performance evaluation parameters.

[0025] In one embodiment, the relaxation time and DC conductivity of the second relaxation process are fitted respectively using curvature fitting technology, and the insulation performance and sensitivity of the polypropylene cable insulation material are analyzed based on the fitting results, including:

[0026] The curvature fitting technology is used to fit the relaxation time of the second relaxation process to obtain the slope of the second relaxation curve, and the potential barrier height that needs to be overcome by carrier jumping in the second relaxation process of the polypropylene cable insulation material is analyzed based on the slope of the second relaxation curve;

[0027] The migration characteristics of charge carriers inside polypropylene cable insulation materials are analyzed based on the potential barrier height, and the insulation performance of polypropylene cable insulation materials is obtained according to the migration characteristics.

[0028] The DC conductive component is fitted by using the curvature fitting technology, and the slope of the DC conductive curve is obtained based on the fitting result;

[0029] The DC conductivity activation energy of polypropylene cable insulation material is analyzed according to the slope of DC conductivity curve, and the sensitivity of insulation performance of polypropylene cable insulation material to temperature is analyzed based on the DC conductivity activation energy.

[0030] According to a second aspect of an embodiment of the present invention, a cable insulation material performance evaluation system is provided.

[0031] In one embodiment, a cable insulation material performance evaluation system includes:

[0032] The frequency domain dielectric spectrum fitting and analysis unit is used to fit the frequency domain dielectric spectra of the polypropylene cable insulation material at different temperatures based on the multi-relaxation dielectric model, and obtain the characteristic parameters and DC conductive components of the polypropylene cable insulation material according to the fitting results;

[0033] The performance evaluation result fitting acquisition unit is used to fit the characteristic parameters and the DC conductivity component based on the fitting analysis technology, analyze the performance evaluation parameters of the polypropylene cable insulation material, and obtain the performance evaluation results of the polypropylene cable insulation material according to the performance evaluation parameters.

[0034] In one embodiment, the frequency domain dielectric spectrum fitting analysis unit includes:

[0035] The frequency domain dielectric spectrum data acquisition module is used to pre-set the test temperature and test frequency of the broadband dielectric impedance spectrometer, and use the broadband dielectric impedance spectrometer that has been set to test the polypropylene cable insulation material to obtain the frequency domain dielectric spectrum data;

[0036] The frequency domain dielectric spectrum fitting module is used to generate the frequency domain dielectric spectra of polypropylene cable insulation materials at different temperatures based on the frequency domain dielectric spectrum data, and fit the frequency domain dielectric spectrum using the multi-relaxation dielectric model corrected by DC conductivity;

[0037] The insulation material relaxation process analysis module is used to obtain characteristic parameters and DC conductive components of the polypropylene cable insulation material based on the fitting results, and analyze the relaxation process of the polypropylene cable insulation material according to the characteristic parameters and DC conductive components.

[0038] In one embodiment, the characteristic parameters of the polypropylene cable insulation material include relaxation strength of a first relaxation process, relaxation strength of a second relaxation process, relaxation time of the first relaxation process, and relaxation time of the second relaxation process.

[0039] In one embodiment, the first relaxation process represents a dipole turning polarization process of the polypropylene cable insulation material, and the second relaxation process represents a carrier hopping polarization process of the polypropylene cable insulation material.

[0040] In one embodiment, the relaxation process of the polypropylene cable insulation material is calculated as follows:

[0041]

[0042] In the formula, ε r represents the complex frequency domain dielectric constant, ε ∞ represents the optical frequency dielectric constant, Δε α With τ α represent the relaxation intensity and relaxation time of the first relaxation process, γ α With β αrepresents the shape parameter of the first relaxation process, Δε δ With τ δ denote the relaxation intensity and relaxation time of the second relaxation process, γ δ With β δ represents the shape parameter of the second relaxation process, σ represents the DC conductivity, ε0 ​​represents the vacuum dielectric constant, i represents the imaginary unit, and ω represents the angular frequency.

[0043] In one embodiment, the performance evaluation result fitting acquisition unit includes:

[0044] A first relaxation curve slope acquisition module is used to fit the relaxation intensity of the first relaxation process based on the collective polar behavior fitting technology, and obtain the first relaxation curve slope of the polypropylene cable insulation material according to the fitting result;

[0045] The first relaxation process analysis module is used to analyze the interaction strength and average dipole moment between dipole molecules in the first relaxation process of polypropylene cable insulation material based on the slope of the curve;

[0046] The insulation sensitivity performance analysis module is used to fit the relaxation time and DC conductivity of the second relaxation process respectively using the curvature fitting technology, and analyze the insulation performance and sensitivity of the polypropylene cable insulation material based on the fitting results;

[0047] The performance evaluation result acquisition module is used to use the interaction strength, insulation performance and sensitivity as performance evaluation parameters of the polypropylene cable insulation material, and obtain the performance evaluation results of the polypropylene cable insulation material based on the performance evaluation parameters.

[0048] In one embodiment, the insulation sensitivity performance analysis module uses the curvature fitting technology to fit the relaxation time and DC conductivity of the second relaxation process respectively, and analyzes the insulation performance and sensitivity of the polypropylene cable insulation material based on the fitting results. The curvature fitting technology can be used to fit the relaxation time of the second relaxation process to obtain the slope of the second relaxation curve, and the barrier height that needs to be overcome for carrier jumping in the second relaxation process of the polypropylene cable insulation material is analyzed based on the slope of the second relaxation curve; the migration characteristics of the carriers inside the polypropylene cable insulation material are analyzed based on the barrier height, and the insulation performance of the polypropylene cable insulation material is obtained according to the migration characteristics; the DC conductive component is fitted using the curvature fitting technology, and the slope of the DC conductive curve is obtained based on the fitting results; the DC conductivity activation energy of the polypropylene cable insulation material is analyzed according to the slope of the DC conductive curve, and the sensitivity of the insulation performance of the polypropylene cable insulation material to temperature is analyzed based on the DC conductivity activation energy.

[0049] According to a third aspect of an embodiment of the present invention, a computer device is provided.

[0050] In one embodiment, the computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0051] According to a fourth aspect of embodiments of the present invention, a computer-readable storage medium is provided.

[0052] In one embodiment, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0053] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0054] 1. Compared with the traditional cable insulation performance detection method, the present invention adopts the frequency domain dielectric spectrum method, which greatly simplifies the experimental operation. By fitting the dielectric spectrum data and extracting the characteristic parameters, it avoids the tedious testing and the use of various experimental equipment, and improves the detection efficiency.

[0055] 2. The present invention can accurately fit the dielectric behavior of polypropylene cable insulation materials by applying the multi-relaxation dielectric model corrected by DC conductivity, and extract key characteristic parameters such as dipole steering polarization intensity and carrier hopping polarization relaxation time, thereby ensuring the accuracy and reliability of the evaluation results. This makes the present invention not only suitable for the development and evaluation of new polypropylene cable insulation materials, but also for the status monitoring and performance evaluation of existing insulation materials, and has broad application prospects.

[0056] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0058] Figure 1 is a flow chart of a cable insulation material performance evaluation method according to an exemplary embodiment;

[0059] Figure 2 is a frequency domain dielectric spectrum diagram showing the real part of the complex dielectric constant at different temperatures according to an exemplary embodiment;

[0060] Figure 3 is a frequency domain dielectric spectrum of the imaginary part of the complex dielectric constant at different temperatures according to an exemplary embodiment;

[0061] Figure 4 is a relaxation intensity diagram of an α relaxation process at different temperatures according to an exemplary embodiment;

[0062] Figure 5 is a relaxation time diagram of a delta relaxation process at different temperatures according to an exemplary embodiment;

[0063] Figure 6 is a diagram of direct current conductivity at different temperatures according to an exemplary embodiment;

[0064] Figure 7 According to an exemplary embodiment, Kirkwood- Formula for Δε α The fitting diagram of

[0065] Figure 8 is a graph showing the Arrhenius formula for τ according to an exemplary embodiment. δ The fitting diagram of

[0066] Fig. 9 is a fitting diagram of σ using the Arrhenius formula according to an exemplary embodiment;

[0067] Fig.10 is a flow chart of a method for evaluating the performance of polypropylene cable insulation materials based on frequency domain dielectric spectroscopy according to an exemplary embodiment;

[0068] Fig.11 is a principle block diagram of a cable insulation material performance evaluation system according to an exemplary embodiment;

[0069] Fig.12 The figure is a schematic diagram showing the structure of a computer device according to an exemplary embodiment. DETAILED DESCRIPTION

[0070] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0071] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0072] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

[0073] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0074] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0075] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0076] Each module in the device or system of the present application can be implemented in whole or in part by software, hardware, or a combination thereof. The above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above modules.

[0077] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0078] Figure 1 An embodiment of the cable insulation material performance evaluation method of the present invention is shown.

[0079] In this optional embodiment, the cable insulation material performance evaluation method includes:

[0080] Step S101, fitting the frequency domain dielectric spectra of the polypropylene cable insulation material at different temperatures based on the multi-relaxation dielectric model, and obtaining characteristic parameters and DC conductive components of the polypropylene cable insulation material according to the fitting results;

[0081] Step S103, fitting the characteristic parameters and the DC conductivity component based on the fitting analysis technology, analyzing the performance evaluation parameters of the polypropylene cable insulation material, and obtaining the performance evaluation results of the polypropylene cable insulation material according to the performance evaluation parameters.

[0082] In this optional embodiment, when fitting the frequency domain dielectric spectra of the polypropylene cable insulation material at different temperatures based on the multi-relaxation dielectric model, and obtaining the characteristic parameters and DC conductive components of the polypropylene cable insulation material according to the fitting results, the test temperature and test frequency of the broadband dielectric impedance spectrometer can be pre-set, and the polypropylene cable insulation material is tested using the broadband dielectric impedance spectrometer that has been set to obtain frequency domain dielectric spectrum data; frequency domain dielectric spectra of the polypropylene cable insulation material at different temperatures are generated based on the frequency domain dielectric spectrum data, and the frequency domain dielectric spectrum is fitted using the multi-relaxation dielectric model corrected by DC conductivity; characteristic parameters and DC conductive components of the polypropylene cable insulation material are obtained based on the fitting results, and the relaxation process of the polypropylene cable insulation material is analyzed according to the characteristic parameters and DC conductive components.

[0083] In this optional embodiment, when fitting the characteristic parameters and the DC conductivity component based on the fitting analysis technology, analyzing the performance evaluation parameters of the polypropylene cable insulation material, and obtaining the performance evaluation results of the polypropylene cable insulation material according to the performance evaluation parameters, the relaxation intensity of the first relaxation process can be fitted based on the collective polar behavior fitting technology, and the first relaxation curve slope of the polypropylene cable insulation material can be obtained according to the fitting result; the interaction strength and the average dipole moment between the dipole molecules in the first relaxation process of the polypropylene cable insulation material are analyzed based on the curve slope; the relaxation time and the DC conductivity of the second relaxation process are respectively fitted by using the curvature fitting technology, and the insulation performance and sensitivity of the polypropylene cable insulation material are analyzed based on the fitting results; the interaction strength, insulation performance and sensitivity are used as the performance evaluation parameters of the polypropylene cable insulation material, and the performance evaluation results of the polypropylene cable insulation material are obtained based on the performance evaluation parameters.

[0084] In this optional embodiment, when the relaxation time and DC conductivity of the second relaxation process are respectively fitted by the curvature fitting technology, and the insulation performance and sensitivity of the polypropylene cable insulation material are analyzed based on the fitting results, the relaxation time of the second relaxation process can be fitted by the curvature fitting technology to obtain the slope of the second relaxation curve, and the barrier height that needs to be overcome for carrier jumping in the second relaxation process of the polypropylene cable insulation material is analyzed based on the slope of the second relaxation curve; the migration characteristics of the carriers inside the polypropylene cable insulation material are analyzed based on the barrier height, and the insulation performance of the polypropylene cable insulation material is obtained based on the migration characteristics; the DC conductive component is fitted by the curvature fitting technology, and the slope of the DC conductive curve is obtained based on the fitting result; the DC conductivity activation energy of the polypropylene cable insulation material is analyzed based on the slope of the DC conductive curve, and the sensitivity of the insulation performance of the polypropylene cable insulation material to temperature is analyzed based on the DC conductivity activation energy.

[0085] Fig.10 An embodiment of a cable insulation material performance evaluation system of the present invention is shown.

[0086] In this optional embodiment, the cable insulation material performance evaluation system includes:

[0087] The frequency domain dielectric spectrum fitting and analysis unit 201 is used to fit the frequency domain dielectric spectra of the polypropylene cable insulation material at different temperatures based on the multi-relaxation dielectric model, and obtain the characteristic parameters and DC conductive components of the polypropylene cable insulation material according to the fitting results;

[0088] The performance evaluation result fitting acquisition unit 203 is used to fit the characteristic parameters and the DC conductivity component based on the fitting analysis technology, analyze the performance evaluation parameters of the polypropylene cable insulation material, and obtain the performance evaluation results of the polypropylene cable insulation material according to the performance evaluation parameters.

[0089] In this optional embodiment, the frequency domain dielectric spectrum fitting analysis unit 201 includes a frequency domain dielectric spectrum data acquisition module (not shown in the figure), a frequency domain dielectric spectrum fitting module (not shown in the figure) and an insulating material relaxation process analysis module (not shown in the figure), wherein:

[0090] The frequency domain dielectric spectrum data acquisition module is used to pre-set the test temperature and test frequency of the broadband dielectric impedance spectrometer, and use the broadband dielectric impedance spectrometer that has been set to test the polypropylene cable insulation material to obtain the frequency domain dielectric spectrum data;

[0091] The frequency domain dielectric spectrum fitting module is used to generate the frequency domain dielectric spectra of polypropylene cable insulation materials at different temperatures based on the frequency domain dielectric spectrum data, and fit the frequency domain dielectric spectrum using the multi-relaxation dielectric model corrected by DC conductivity;

[0092] The insulation material relaxation process analysis module is used to obtain characteristic parameters and DC conductive components of the polypropylene cable insulation material based on the fitting results, and analyze the relaxation process of the polypropylene cable insulation material according to the characteristic parameters and DC conductive components.

[0093] In this optional embodiment, the performance evaluation result fitting acquisition unit 203 includes a first relaxation curve slope acquisition module (not shown in the figure), a first relaxation process analysis module (not shown in the figure), an insulation sensitivity performance analysis module (not shown in the figure) and a performance evaluation result acquisition module (not shown in the figure), wherein:

[0094] A first relaxation curve slope acquisition module is used to fit the relaxation intensity of the first relaxation process based on the collective polar behavior fitting technology, and obtain the first relaxation curve slope of the polypropylene cable insulation material according to the fitting result;

[0095] The first relaxation process analysis module is used to analyze the interaction strength and average dipole moment between dipole molecules in the first relaxation process of polypropylene cable insulation material based on the slope of the curve;

[0096] The insulation sensitivity performance analysis module is used to fit the relaxation time and DC conductivity of the second relaxation process respectively using the curvature fitting technology, and analyze the insulation performance and sensitivity of the polypropylene cable insulation material based on the fitting results;

[0097] The performance evaluation result acquisition module is used to use the interaction strength, insulation performance and sensitivity as performance evaluation parameters of the polypropylene cable insulation material, and obtain the performance evaluation results of the polypropylene cable insulation material based on the performance evaluation parameters.

[0098] In this optional embodiment, when the insulation sensitivity performance analysis module uses the curvature fitting technology to fit the relaxation time and DC conductivity of the second relaxation process respectively, and analyzes the insulation performance and sensitivity of the polypropylene cable insulation material based on the fitting results, the curvature fitting technology can be used to fit the relaxation time of the second relaxation process to obtain the slope of the second relaxation curve, and the barrier height that needs to be overcome for carrier jumping in the second relaxation process of the polypropylene cable insulation material is analyzed based on the slope of the second relaxation curve; the migration characteristics of the carriers inside the polypropylene cable insulation material are analyzed based on the barrier height, and the insulation performance of the polypropylene cable insulation material is obtained based on the migration characteristics; the DC conductive component is fitted using the curvature fitting technology, and the slope of the DC conductive curve is obtained based on the fitting result; the DC conductivity activation energy of the polypropylene cable insulation material is analyzed based on the slope of the DC conductive curve, and the sensitivity of the insulation performance of the polypropylene cable insulation material to temperature is analyzed based on the DC conductivity activation energy.

[0099] like Fig.10 As shown, it needs to be explained that the performance evaluation method of polypropylene cable insulation material proposed in this embodiment is based on frequency domain dielectric spectrum. It mainly measures the polypropylene cable insulation sample to be tested by a broadband dielectric impedance spectrometer, obtains the curve of the real and imaginary parts of the complex dielectric constant of the cable insulation sample to be tested changing with the frequency, obtains the frequency domain dielectric spectrum, and then uses the multi-relaxation dielectric model corrected by DC conductivity to fit the frequency domain dielectric spectrum.

[0100] When obtaining the frequency domain dielectric spectrum, a broadband dielectric impedance spectrometer can be used to set the preset test conditions, including the selection of measurement samples, the measured frequency range, the required measurement temperature, etc. It should be noted that since the frequency domain dielectric spectrum of polypropylene materials is affected by temperature, at least three suitable temperatures need to be selected before testing, and preset on the dielectric impedance spectrometer to ensure the stability of the temperature during the measurement and prevent the temperature fluctuation from interfering with the experimental results. At the same time, the broadband dielectric impedance spectrometer can be measured in a wide range of temperatures and frequencies. Specifically, it can be measured in the range of -160-500℃, 10 -3 Hz-10 6 The measurement is carried out at Hz, the voltage can be selected in the range of 0-2kV, the electrode size can be selected between 20mm, 25mm, 30mm, 40mm, and the selectable conductive electrodes include aluminum electrode, copper electrode, silver electrode and gold electrode.

[0101] In this embodiment, the test temperature is selected as 10°C, 30°C, 50°C, 70°C and 90°C, and the frequency selection range is 10 -2 Hz to 10 4 Hz, the voltage is 1kV, the electrode size is 25mm, and before testing, a special mold is used to spray a gold layer on the surface of the sample to be tested to ensure good contact between the electrode and the sample to be tested.

[0102] The real and imaginary parts of the complex dielectric constants of different polypropylene cable insulation materials are not the same. By obtaining the frequency domain dielectric spectra of the materials at different frequencies, the internal dipole steering, carrier transition behavior and conductivity sensitivity to temperature of the materials can be reflected, thereby evaluating the performance of the materials in many aspects.

[0103] like Figure 2 The different polypropylene cable insulation materials shown are tested at four target temperatures of 10°C, 30°C, 50°C, 70°C and 90°C with a frequency of 10 -2 Hz–10 4 Hz, frequency domain dielectric spectrum of the real part of the complex dielectric constant of the measured material when the frequency step is 1.4 times.

[0104] Among them, the horizontal axis is the measured frequency, and the vertical axis is the real part of the measured complex dielectric constant. Figure 2 (a) is polypropylene sample No. 1 (hereinafter referred to as PP-1), Figure 2 (b) is polypropylene sample No. 2 (hereinafter referred to as PP-2), Figure 2 (c) is polypropylene sample No. 3 (hereinafter referred to as PP-3), Figure 2 (d) is polypropylene sample No. 4 (hereinafter referred to as PP-4).

[0105] like Figure 3The different polypropylene cable insulation materials shown are tested at four target temperatures of 10°C, 30°C, 50°C, 70°C and 90°C with a frequency of 10 -2 Hz–10 4 Hz, frequency domain dielectric spectrum of the imaginary part of the complex dielectric constant of the measured material when the frequency step is 1.4 times.

[0106] Among them, the horizontal axis is the measured frequency, and the vertical axis is the measured imaginary part of the complex dielectric constant. Figure 3 (a) is polypropylene sample No. 1 (hereinafter referred to as PP-1), Figure 3 (b) is polypropylene sample No. 2 (hereinafter referred to as PP-2), Figure 3 (c) is polypropylene sample No. 3 (hereinafter referred to as PP-3), Figure 3 (d) is polypropylene sample No. 4 (hereinafter referred to as PP-4).

[0107] According to the measured frequency domain dielectric spectrum, the Havriliak-Negami model corrected by DC conductivity is used to obtain parameters including the relaxation intensity of the first relaxation process α and the second relaxation process δ, the relaxation time of the first relaxation process α and the second relaxation process δ, and the DC conductivity component.

[0108] The selectable DC conductivity corrected multi-relaxation dielectric model includes any one of the DC conductivity corrected Cole-Cole model, the DC conductivity corrected Cole-Davidson model and the DC conductivity corrected Havriliak-Negami model;

[0109] It should be explained that the dielectric relaxation models include the Debye model, the Cole-Cole model, the Cole-Davidson model and the Havriliak-Negami model. Since the polypropylene material does not have a single polarization form inside, the fitting parameters obtained using the Debye model are quite different from the actual situation, and the goodness of fit is low, which will result in a large error between the evaluation result and the actual result. Therefore, in this embodiment, the Havriliak-Negami model corrected by DC conductivity is preferably used to fit the measured frequency domain dielectric spectrum.

[0110] The DC conductivity-corrected Havriliak-Negami model can accurately describe the relaxation process of complex polymer materials. The formula is as follows:

[0111]

[0112] In the formula, ε r represents the complex frequency domain dielectric constant, ε ∞ represents the optical frequency dielectric constant, Δε α With τ αrepresent the relaxation intensity and relaxation time of the first relaxation process, γ α With β α represents the shape parameter of the first relaxation process, Δε δ With τ δ denote the relaxation intensity and relaxation time of the second relaxation process, γ δ With β δ represents the shape parameter of the second relaxation process, σ represents the DC conductivity, ε0 ​​represents the vacuum dielectric constant, i represents the imaginary unit, and ω represents the angular frequency.

[0113] In this embodiment, the DC conductivity corrected Havriliak-Negami model is selected. This is because the Havriliak-Negami model can more accurately describe the relaxation process of complex materials and has a wider applicable frequency range. Under certain conditions, the Havriliak-Negami model can also be converted into the Cole-Cole model and the Cole-Davidson model.

[0114] Since it is necessary to fit the relationship between the relaxation characteristic parameters and the temperature to obtain the material performance evaluation parameters, it is necessary to perform measurements at at least three specified temperatures and under at least three different specified temperature conditions. For polypropylene cable insulation materials, frequency domain dielectric spectra can be measured at 10°C, 30°C, 50°C, 70°C and 90°C.

[0115] The frequency domain dielectric spectrum of the polypropylene cable insulation material is measured according to the selected temperature, and the DC conductivity corrected Havriliak-Negami model is used for fitting to obtain the intensity of the first relaxation process α, the intensity of the second relaxation process δ, the time constant α of the first relaxation process, the time constant of the second relaxation process δ, the shape coefficient of the first relaxation process α, the shape coefficient of the second relaxation process δ and the DC conductivity component σ.

[0116] Specifically, for the first relaxation process α, it represents the dipole steering polarization process of the material, and for the first relaxation process δ, it represents the carrier hopping polarization process of the material.

[0117] like Figures 4 to 6 As shown, through the Havriliak-Negami model corrected by DC conductivity, the intensity of the first relaxation process α, the intensity of the second relaxation process δ, the time constant α of the first relaxation process, the time constant of the second relaxation process δ, the shape coefficient of the first relaxation process α, the shape coefficient of the second relaxation process δ and the DC conductivity component σ are extracted, and the three characteristic parameters of α relaxation intensity, δ relaxation time and DC conductivity component σ are selected, and the relationship between α relaxation intensity, δ relaxation time, DC conductivity component σ and temperature is established to obtain the material performance evaluation parameters of insulation.

[0118] The α relaxation process is believed to be caused by the motion of molecular chains in the amorphous region. From the perspective of dipoles, it is believed to be caused by the large-scale dipole relaxation motion caused by the micro-Brownian motion of the polymer molecular chain segments. The Δε of different polypropylene materials is α There is a big difference, which can be used to make use of Kirkwood- (collective polar behavior fitting technique) formula for analysis.

[0119] Kirkwood– The formula can analyze the relationship between the dielectric relaxation strength and some parameters in the dielectric relaxation process. The formula is as follows:

[0120]

[0121] In the formula, Δε α represents the relaxation intensity of the first relaxation process, ε0 represents the vacuum dielectric constant, g represents the interaction between the molecules of the dipoles involved in the α relaxation process, μ represents the average dipole moment of the α relaxation process, and k B represents the Boltzmann constant, N / V represents the number of dipoles per unit volume that contribute to the α relaxation polarization process, M represents the molecular mass of the material involved in the α relaxation process, and N A is Avogadro's constant, ρ A represents the density of the amorphous region of the material, and T represents the absolute temperature.

[0122] Simplify Kirkwood– The formula is:

[0123] Δε α ∝gμ 2 / T;

[0124] The relaxation strength of the α relaxation process is proportional to the product of the molecular interaction of the dipoles involved in the α relaxation process and the average dipole moment of the α relaxation process.

[0125] Adopt Kirkwood– Formula for Δε α Perform fitting to obtain the slope of the fitting curve (the slope of the first relaxation curve) E α , which is proportional to the product of the interaction between the molecules of the dipoles involved in the α relaxation process and the average dipole moment of the α relaxation process.

[0126] like Figure 7 As shown in the figure, based on the fitting results, the E values ​​of the four dielectric modified materials are obtained. αThe order of sizes is: PP-4>PP-3>PP-2>PP-1, which indicates that the interaction between dipoles of PP-4 material is strong and the average dipole moment is large, while the interaction between dipoles of PP-1 is weak and the average dipole moment is small.

[0127] The strong interaction between dipoles and the large average dipole moment indicate that there are many polar molecules inside the polypropylene material, which will lead to increased dielectric loss of polypropylene cable insulation during operation, which is not good for the cable.

[0128] It should be explained that the second relaxation process is the carrier jumping polarization of electrons, ions or holes, that is, under the action of the external electric field, the charge jumps out of the original trap and enters another trap, leaving a charge of opposite polarity in the original trap and generating a charge of the same polarity in the entered trap, thus forming a dipole moment. This polarization belongs to a kind of space charge polarization. The τ of different polypropylene materials is δ There is a big difference, which can be analyzed by Arrhenius (curvature fitting technology) formula to obtain the slope of the fitting curve (the slope of the second relaxation curve) is E δ , specifically:

[0129]

[0130] Where τ0 represents the pre-relaxation time, E δ represents the height of the barrier that carriers need to overcome for jumping, k represents the Boltzmann constant, and T represents the absolute temperature.

[0131] E δ The height of the potential barrier that a carrier needs to overcome when jumping from one trap to another is closely related to the trap energy level of the material. The trapped charges in the insulating medium will remain in the trap until the charges obtain enough energy to escape. Generally speaking, the deeper the trap depth or the greater the trap density inside the material, the greater the potential barrier that the trapped charges need to overcome to escape.

[0132] like Figure 8 As shown in the fitting results, it can be seen that the E δ The order of sizes is: PP-4>PP-3>PP-2>PP-1, which means that the potential barrier that needs to be overcome in the process of carriers jumping out of the trap of PP-4 material is the largest, and the potential barrier that needs to be overcome in the process of carriers jumping out of the trap of PP-1 material is the smallest. In addition, the potential barrier that needs to be overcome in the process of carriers jumping out of the trap is large, which means that the migration of carriers inside the material is more difficult, and the insulation performance of the reaction polypropylene material is good.

[0133] It should be explained that the DC conductivity process is closely related to the second relaxation process, both of which are processes in which carriers migrate across potential barriers. However, the DC conductivity process can also reflect the sensitivity of the insulation performance of the material to temperature. The σ of different polypropylene materials is quite different, which can be analyzed using the Arrhenius (curvature fitting technology) formula. The slope of the fitting curve (the slope of the DC conductivity curve) is E σ , specifically:

[0134]

[0135] In the formula, A is a constant that is independent of temperature, and E σ represents the activation energy of DC conductivity, k represents the Boltzmann constant, and T represents the absolute temperature.

[0136] like Fig. 9 As shown in the fitting results, it can be seen that the E σ The order is: PP-4>PP-3>PP-2>PP-1. On the one hand, this shows that PP-4 can effectively inhibit the migration of carriers, but at the same time, the insulation performance of PP-4 is more sensitive to temperature. Within the same temperature change range, the insulation performance of PP-4 changes more greatly, which is not conducive to the long-term stable operation of cable insulation.

[0137] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Fig.12 As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control 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 the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in the above method embodiment are implemented.

[0138] Those skilled in the art will understand that Fig.12 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0139] In addition, the present invention also provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiment when executing the computer program.

[0140] In addition, the present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiment are implemented.

[0141] 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, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention 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 or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0142] The present invention is not limited to the structures which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for evaluating the performance of cable insulation materials, characterized in that: The performance evaluation method includes: Based on the multi-relaxation dielectric model, the frequency domain dielectric spectra of polypropylene cable insulation materials at different temperatures are fitted, and the characteristic parameters and DC conductive components of polypropylene cable insulation materials are obtained according to the fitting results. Based on the fitting analysis technology, the characteristic parameters and the DC conductivity components are fitted, the performance evaluation parameters of the polypropylene cable insulation material are analyzed, and the performance evaluation results of the polypropylene cable insulation material are obtained according to the performance evaluation parameters.

2. The cable insulation material performance evaluation method according to claim 1, characterized in that: The method of fitting the frequency domain dielectric spectra of the polypropylene cable insulation material at different temperatures based on the multi-relaxation dielectric model and obtaining the characteristic parameters and DC conductive components of the polypropylene cable insulation material according to the fitting results includes: The test temperature and test frequency of the broadband dielectric impedance spectrometer are pre-set, and the polypropylene cable insulation material is tested using the broadband dielectric impedance spectrometer to obtain frequency domain dielectric spectrum data; Based on the frequency domain dielectric spectrum data, the frequency domain dielectric spectra of polypropylene cable insulation materials at different temperatures are generated, and the multi-relaxation dielectric model corrected by DC conductivity is used to fit the frequency domain dielectric spectra. Based on the fitting results, the characteristic parameters and DC conductive components of the polypropylene cable insulation material are obtained, and the relaxation process of the polypropylene cable insulation material is analyzed according to the characteristic parameters and DC conductive components.

3. The cable insulation material performance evaluation method according to claim 2, characterized in that: The characteristic parameters of the polypropylene cable insulation material include relaxation strength in the first relaxation process, relaxation strength in the second relaxation process, relaxation time in the first relaxation process and relaxation time in the second relaxation process.

4. The cable insulation material performance evaluation method according to claim 3, characterized in that: The first relaxation process represents a dipole steering polarization process of the polypropylene cable insulation material, and the second relaxation process represents a carrier hopping polarization process of the polypropylene cable insulation material.

5. The cable insulation material performance evaluation method according to claim 4, characterized in that: The calculation formula of the relaxation process of the polypropylene cable insulation material is: In the formula, ε r represents the complex frequency domain dielectric constant, ε ∞ represents the optical frequency dielectric constant, Δε α With τ α represent the relaxation intensity and relaxation time of the first relaxation process, γ α With β α represents the shape parameter of the first relaxation process, Δε δ With τ δ denote the relaxation intensity and relaxation time of the second relaxation process, γ δ With β δ represents the shape parameter of the second relaxation process, σ represents the DC conductivity, ε0 ​​represents the vacuum dielectric constant, i represents the imaginary unit, and ω represents the angular frequency.

6. The cable insulation material performance evaluation method according to claim 1, characterized in that: The method of fitting the characteristic parameters and the DC conductivity component based on the fitting analysis technology, analyzing the performance evaluation parameters of the polypropylene cable insulation material, and obtaining the performance evaluation results of the polypropylene cable insulation material according to the performance evaluation parameters includes: The relaxation intensity of the first relaxation process is fitted based on the collective polar behavior fitting technology, and the slope of the first relaxation curve of the polypropylene cable insulation material is obtained according to the fitting result; The interaction strength and average dipole moment between dipole molecules in the first relaxation process of polypropylene cable insulation material are analyzed based on the slope of the curve. The relaxation time and DC conductivity of the second relaxation process were fitted using curvature fitting technology, and the insulation performance and sensitivity of polypropylene cable insulation materials were analyzed based on the fitting results. The interaction strength, insulation performance and sensitivity are used as performance evaluation parameters of polypropylene cable insulation materials, and the performance evaluation results of polypropylene cable insulation materials are obtained based on the performance evaluation parameters.

7. The cable insulation material performance evaluation method according to claim 6, characterized in that: The curvature fitting technology is used to fit the relaxation time and DC conductivity of the second relaxation process respectively, and the insulation performance and sensitivity of the polypropylene cable insulation material are analyzed based on the fitting results, including: The curvature fitting technology is used to fit the relaxation time of the second relaxation process to obtain the slope of the second relaxation curve, and the potential barrier height that needs to be overcome by carrier jumping in the second relaxation process of the polypropylene cable insulation material is analyzed based on the slope of the second relaxation curve; The migration characteristics of charge carriers inside polypropylene cable insulation materials are analyzed based on the potential barrier height, and the insulation performance of polypropylene cable insulation materials is obtained according to the migration characteristics. The DC conductive component is fitted by using the curvature fitting technology, and the slope of the DC conductive curve is obtained based on the fitting result; The DC conductivity activation energy of polypropylene cable insulation material is analyzed according to the slope of DC conductivity curve, and the sensitivity of insulation performance of polypropylene cable insulation material to temperature is analyzed based on the DC conductivity activation energy.

8. A cable insulation material performance evaluation system, characterized in that: The performance evaluation system includes: The frequency domain dielectric spectrum fitting and analysis unit is used to fit the frequency domain dielectric spectra of the polypropylene cable insulation material at different temperatures based on the multi-relaxation dielectric model, and obtain the characteristic parameters and DC conductive components of the polypropylene cable insulation material according to the fitting results; The performance evaluation result fitting acquisition unit is used to fit the characteristic parameters and the DC conductivity component based on the fitting analysis technology, analyze the performance evaluation parameters of the polypropylene cable insulation material, and obtain the performance evaluation results of the polypropylene cable insulation material according to the performance evaluation parameters.

9. The cable insulation material performance evaluation system according to claim 8, characterized in that: The frequency domain dielectric spectrum fitting analysis unit comprises: The frequency domain dielectric spectrum data acquisition module is used to pre-set the test temperature and test frequency of the broadband dielectric impedance spectrometer, and use the broadband dielectric impedance spectrometer that has been set to test the polypropylene cable insulation material to obtain the frequency domain dielectric spectrum data; The frequency domain dielectric spectrum fitting module is used to generate the frequency domain dielectric spectra of polypropylene cable insulation materials at different temperatures based on the frequency domain dielectric spectrum data, and fit the frequency domain dielectric spectrum using the multi-relaxation dielectric model corrected by DC conductivity; The insulation material relaxation process analysis module is used to obtain characteristic parameters and DC conductive components of the polypropylene cable insulation material based on the fitting results, and analyze the relaxation process of the polypropylene cable insulation material according to the characteristic parameters and DC conductive components.

10. The cable insulation material performance evaluation system according to claim 9, characterized in that: The characteristic parameters of the polypropylene cable insulation material include relaxation strength in the first relaxation process, relaxation strength in the second relaxation process, relaxation time in the first relaxation process and relaxation time in the second relaxation process.

11. The cable insulation material performance evaluation system according to claim 10, characterized in that: The first relaxation process represents a dipole steering polarization process of the polypropylene cable insulation material, and the second relaxation process represents a carrier hopping polarization process of the polypropylene cable insulation material.

12. The cable insulation material performance evaluation system according to claim 11, characterized in that: The calculation formula of the relaxation process of the polypropylene cable insulation material is: In the formula, ε r represents the complex frequency domain dielectric constant, ε ∞ represents the optical frequency dielectric constant, Δε α With τ α represent the relaxation intensity and relaxation time of the first relaxation process, γ α With β α represents the shape parameter of the first relaxation process, Δε δ With τ δ denote the relaxation intensity and relaxation time of the second relaxation process, γ δ With β δ represents the shape parameter of the second relaxation process, σ represents the DC conductivity, ε0 ​​represents the vacuum dielectric constant, i represents the imaginary unit, and ω represents the angular frequency.

13. The cable insulation material performance evaluation system according to claim 12, characterized in that: The performance evaluation result fitting acquisition unit comprises: A first relaxation curve slope acquisition module is used to fit the relaxation intensity of the first relaxation process based on the collective polar behavior fitting technology, and obtain the first relaxation curve slope of the polypropylene cable insulation material according to the fitting result; The first relaxation process analysis module is used to analyze the interaction strength and average dipole moment between dipole molecules in the first relaxation process of polypropylene cable insulation material based on the slope of the curve; The insulation sensitivity performance analysis module is used to fit the relaxation time and DC conductivity of the second relaxation process respectively using the curvature fitting technology, and analyze the insulation performance and sensitivity of the polypropylene cable insulation material based on the fitting results; The performance evaluation result acquisition module is used to use the interaction strength, insulation performance and sensitivity as performance evaluation parameters of the polypropylene cable insulation material, and obtain the performance evaluation results of the polypropylene cable insulation material based on the performance evaluation parameters.

14. The cable insulation material performance evaluation system according to claim 13, characterized in that: The insulation sensitivity performance analysis module uses the curvature fitting technology to fit the relaxation time and DC conductivity of the second relaxation process respectively, and analyzes the insulation performance and sensitivity of the polypropylene cable insulation material based on the fitting results. The curvature fitting technology can be used to fit the relaxation time of the second relaxation process to obtain the slope of the second relaxation curve, and the barrier height that needs to be overcome by carrier jumping in the second relaxation process of the polypropylene cable insulation material is analyzed based on the slope of the second relaxation curve; the migration characteristics of the carriers inside the polypropylene cable insulation material are analyzed based on the barrier height, and the insulation performance of the polypropylene cable insulation material is obtained according to the migration characteristics; the curvature fitting technology is used to fit the DC conductive component, and the slope of the DC conductive curve is obtained based on the fitting result; the DC conductivity activation energy of the polypropylene cable insulation material is analyzed according to the slope of the DC conductive curve, and the sensitivity of the insulation performance of the polypropylene cable insulation material to temperature is analyzed based on the DC conductivity activation energy.

15. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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