Capacitor strap and impregnant compatibility evaluation method, system, medium, and apparatus based on dynamic mechanical analysis

Abstract

The application discloses a capacitor binding tape and impregnant compatibility evaluation method, system, medium and equipment based on dynamic mechanical analysis, and the method comprises the following steps: S1, the capacitor binding tape is immersed in Jarylec C101 for compatibility experiment; S2, dynamic mechanical analysis experiment DMA is carried out on the sample of each experimental time; S3, the experimental results of each dynamic mechanical analysis experiment DMA are subjected to atlas analysis; S4, the compatibility of the capacitor binding tape and the impregnant is evaluated by using the glass transition temperature and the molecular chain segment displacement activation energy of the binding tape obtained in step S3 under different compatibility experimental times. By analyzing the dynamic mechanical properties of the capacitor binding tape polypropylene drawing grade resin, the compatibility of the capacitor binding tape and the impregnant Jarylec C101 can be accurately evaluated.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic thermomechanical analysis, and in particular to a method, system, medium and equipment for evaluating the compatibility of a capacitor binding tape and an impregnating agent based on dynamic thermomechanical analysis. Background Art

[0002] Capacitor binding tape is mainly PP binding tape, the main material of which is polypropylene drawing grade resin. It is one of the lighter common plastics. Due to its good plasticity, strong breaking strength, resistance to bending fatigue, light specific gravity, good tensile impact performance, and ease of use, it is widely used in various fields, including capacitors.

[0003] Currently, insulating oil with the product model Jarylec C101 is widely used as an impregnant for power capacitors. It has excellent performance and good durability, but it can cause the organic insulating material such as the binding tape to swell, reducing its tensile strength. At the same time, the inorganic additives from the binding tape dissolve in the impregnant, which can significantly increase the dielectric loss of the impregnant and affect the operational safety of the capacitor.

[0004] Impregnants cause capacitor binding tape to swell, reducing its tensile strength and other performance issues. This can lead to the tape's sudden breakage during use, causing capacitor cells to disintegrate and endangering its safe operation. Furthermore, inorganic additives in the tape dissolve in the impregnant, increasing its dielectric loss, potentially causing capacitor heating and even breakdown, fire, and other accidents. Therefore, accurately assessing the compatibility of capacitor binding tape and impregnants is crucial. Currently, few methods exist for evaluating the compatibility of capacitor silicone rubber and impregnants. Existing methods, such as the Arrhenius equation, kinetic curve linearization, and mathematical modeling, are all designed to predict the remaining life of binding tapes. These methods are based on data simulation rather than actual experimental testing.

[0005] Dynamic mechanical analysis (DMA) is a technique that measures the dynamic modulus of deformation of a material under vibration load and the relationship between mechanical loss and temperature at a programmed temperature. Because polypropylene molecular motion has three characteristics: the multiplicity of motion units, the relaxation characteristics of molecular motion, and temperature dependence, it is particularly suitable for performance analysis using dynamic mechanics to evaluate its compatibility with capacitor impregnants. Summary of the Invention

[0006] To address the technical problems existing in the prior art, the present invention provides a method, system, medium, and equipment for evaluating the compatibility of capacitor binding tape and impregnating agent based on dynamic thermomechanical analysis. By analyzing the dynamic thermomechanical properties of the polypropylene drawing-grade resin used in capacitor binding tape, the compatibility of capacitor binding tape and the impregnating agent Jarylec C101 can be more accurately evaluated.

[0007] The method of the present invention is implemented by the following technical solution: a method for evaluating the compatibility of capacitor binding tape and impregnating agent based on dynamic thermomechanical analysis, comprising the following steps:

[0008] S1. Immerse the capacitor binding tape in Jarylec C101 for compatibility testing.

[0009] S2. Perform dynamic thermomechanical analysis (DMA) on samples at each experimental time.

[0010] S3. Analyze the experimental results of each dynamic mechanical analysis (DMA) experiment;

[0011] S4. Using the glass transition temperature and molecular segment displacement activation energy of the binding tape obtained in step S3 at different compatibility test times, the compatibility of the capacitor binding tape and the impregnant is evaluated.

[0012] The system of the present invention adopts the following technical solutions to achieve: a capacitor binding tape and impregnant compatibility evaluation system based on dynamic thermomechanical analysis, comprising:

[0013] Compatibility test module: used to immerse capacitor binding tape in Jarylec C101 for compatibility testing;

[0014] Dynamic thermomechanical analysis experiment module: used to perform dynamic thermomechanical analysis experiment DMA on samples at each experimental time;

[0015] Spectrum analysis module: used to perform spectrum analysis on the experimental results of each dynamic thermal mechanical analysis experiment DMA;

[0016] Evaluation Module: Evaluates the compatibility of capacitor binding tape and impregnant by using the glass transition temperature and molecular segment displacement activation energy of the binding tape at different compatibility test times.

[0017] The present invention also provides a storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method for evaluating the compatibility of a capacitor binding tape with an impregnating agent of the present invention are implemented.

[0018] The present invention also proposes a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for evaluating the compatibility of a capacitor binding tape with an impregnating agent according to the present invention is implemented.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] 1. The present invention can accurately evaluate the compatibility of capacitor binding tape and impregnant Jarylec C101 by analyzing the dynamic thermomechanical properties of polypropylene drawing grade resin for capacitor binding tape.

[0021] 2. The present invention cleverly utilizes the multiplicity of motion units, the relaxation characteristics of molecular motion, and the temperature dependence of the polypropylene molecular motion in capacitor binding tape, three characteristics that are suitable for dynamic thermomechanical performance analysis and research, to conduct compatibility assessment; combined with the characteristics of the molecules themselves, the compatibility assessment is more accurate.

[0022] 3. The evaluation method of the present invention is simple to operate, has low difficulty in processing experimental results, and has high evaluation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a flow chart of the method of the present invention;

[0024] Figure 2 This is a DMA test result diagram of the binding tape of the present invention with a compatibility test duration of 0 hours;

[0025] Figure 3 This is a DMA test result diagram of the binding tape of the present invention with a compatibility test duration of 504 hours. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0027] Example

[0028] like Figure 1 As shown, the method for evaluating the compatibility of capacitor binding tape and impregnant based on dynamic thermomechanical analysis in this embodiment includes the following steps:

[0029] S1. Immerse the capacitor binding tape in Jarylec C101 for compatibility testing.

[0030] S2. Perform dynamic thermomechanical analysis (DMA) on samples at each experimental time.

[0031] S3. Analyze the experimental results of each dynamic mechanical analysis (DMA) experiment;

[0032] S4. Using the glass transition temperature and molecular segment displacement activation energy of the binding tape obtained in step S3 at different compatibility test times, the compatibility of the capacitor binding tape and the impregnant is evaluated.

[0033] Specifically, in this embodiment, the specific process of step S1 is: at 105 degrees Celsius, the binding tape and the impregnating agent are impregnated in a ratio of 65 square centimeters to 800 milliliters. The experimental time is 168 hours, 336 hours, 504 hours, and 672 hours respectively to obtain evaluation samples.

[0034] Specifically, in this embodiment, the specific process of step S2 is as follows:

[0035] S21. Conduct a dynamic thermomechanical performance test with constant frequency and variable temperature on the samples at each experimental time;

[0036] S22. The dynamic thermomechanical analysis test instrument used is the Swiss METTLER SDTA861e model, which can easily and quickly characterize the dynamic thermomechanical properties of the sample at different temperatures and frequencies; the test temperature range is -20 degrees Celsius to 60 degrees Celsius, the heating rate is set to 3 degrees Celsius per minute, the frequencies are set to 1Hz, 5Hz, 10Hz and 20Hz respectively, the force is set to 0.5N, and the displacement is set to 30 microns.

[0037] Specifically, in this embodiment, the specific process of step S3 is: using the experimental results obtained in step S2, with the modulus as the Y-axis and the temperature as the X-axis, to perform graphical analysis, the glass transition temperature (Tg) of the binding tape is obtained through image analysis, and images of different frequencies are compared to calculate the displacement activation energy of the molecular chain segments of the binding tape, and quantitatively characterize the movement of the molecular chain segments.

[0038] Specifically, in this embodiment, by selecting sufficient capacitor binding tape and impregnating agent, the dynamic mechanical analysis (DMA) experimental results of the sample are analyzed graphically, as shown in FIG. Figure 2 and Figure 3 shown.

[0039] Specifically, in this example, the glass transition temperature (Tg) of the samples was determined through spectral analysis. The figure shows that as the test frequency increases, the loss peaks (corresponding to the Tg temperature) of all samples shift toward higher temperatures. This is because increasing the applied frequency makes it difficult for the molecular segments to move, requiring them to absorb more energy from the outside world to complete the movement. The extent to which the Tg temperature shifts toward higher temperatures with test frequency depends on the activation energy of molecular segment displacement. The relationship between the test frequency f and the Tg temperature is as follows:

[0040]

[0041] Where ΔH is the activation energy of molecular chain segment displacement, f0 is the natural frequency of the binding tape molecules, and R is the molar gas constant.

[0042] In this embodiment, the glass transition temperature and molecular segment displacement activation energy of the samples at each compatibility test time were obtained through calculation and analysis, as shown in the following table:

[0043]

[0044] It can be concluded that after the compatibility test, the glass transition temperature of the binding tape continued to decrease and the molecular chain segment displacement activation energy also decreased significantly before 504 hours of the experiment. However, after 504 hours, the decrease in the glass transition temperature and molecular chain segment displacement activation energy decreased and remained stable. At 672 hours, the Tg and ΔH of the binding tape were still within the normal range. Therefore, it can be assessed that the capacitor binding tape and the impregnant have good compatibility.

[0045] Based on the same inventive concept, the present invention also proposes a compatibility evaluation system for capacitor binding tape and impregnant based on dynamic thermomechanical analysis, comprising:

[0046] Compatibility test module: used to immerse capacitor binding tape in Jarylec C101 for compatibility testing;

[0047] Dynamic thermomechanical analysis experiment module: used to perform dynamic thermomechanical analysis experiment DMA on samples at each experimental time;

[0048] Spectrum analysis module: used to perform spectrum analysis on the experimental results of each dynamic thermal mechanical analysis experiment DMA;

[0049] Evaluation Module: Evaluates the compatibility of capacitor binding tape and impregnant by using the glass transition temperature and molecular segment displacement activation energy of the binding tape at different compatibility test times.

[0050] The present invention also provides a storage medium and a computer device. The storage medium stores a computer program that, when executed by a processor, implements steps S1-S4 of the method for evaluating the compatibility of a capacitor binding tape with an impregnant according to the present invention. The computer device includes a memory, a processor, and a computer program stored in the memory and executable by the processor. When the processor executes the computer program, the method for evaluating the compatibility of a capacitor binding tape with an impregnant according to the present invention, namely, the process including steps S1-S4, is implemented.

[0051] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A method for evaluating the compatibility of capacitor binding tape and impregnating agent based on dynamic thermomechanical analysis, characterized in that: The following steps are involved: S1. Immerse the capacitor binding tape in Jarylec C101 for compatibility testing. S2. Perform dynamic thermomechanical analysis (DMA) on samples at each experimental time. S3. Analyze the experimental results of each dynamic mechanical analysis (DMA) experiment; S4. Evaluate the compatibility of the capacitor binding tape and the impregnant using the glass transition temperature and molecular segment displacement activation energy of the binding tape obtained in step S3 at different compatibility test times; The specific process of step S1 is as follows: at 105 degrees Celsius, the binding tape is impregnated with the impregnant at a ratio of 65 square centimeters to 800 milliliters. The experimental time is 168 hours, 336 hours, 504 hours, and 672 hours, respectively, to obtain evaluation samples; The specific process of step S3 is as follows: using the experimental results obtained in step S2, performing graphical analysis, obtaining the glass transition temperature Tg of the binding tape through image analysis, and comparing images of different frequencies to calculate the activation energy of the molecular chain segment displacement of the binding tape, thereby quantitatively characterizing the molecular chain segment motion; The plotting process includes: plotting the experimental results obtained in step S2 with the modulus as the Y axis and the temperature as the X axis; The calculation process of the activation energy of the molecular chain displacement of the binding tape is as follows: Where f is the test frequency, ΔH is the activation energy of molecular chain displacement, f0 is the natural frequency of the binding tape molecules, and R is the molar gas constant.

2. The method for evaluating the compatibility of capacitor binding tape and impregnant based on dynamic thermomechanical analysis according to claim 1, characterized in that: The specific process of step S2 is as follows: S21. Conduct a dynamic thermomechanical performance test with constant frequency and variable temperature on the samples at each experimental time; S22. The dynamic thermomechanical analysis test instrument used is the Swiss METTLER SDTA861e model. The test temperature range is -20 degrees Celsius to 60 degrees Celsius, the heating rate is set to 3 degrees Celsius per minute, the frequencies are set to 1Hz, 5Hz, 10Hz and 20Hz respectively, the force is set to 0.5 Newton, and the displacement is set to 30 microns.

3. The method for evaluating the compatibility of capacitor binding tape and impregnant based on dynamic thermomechanical analysis according to claim 1, characterized in that: The evaluation process of step S4 is as follows: after obtaining the glass transition temperature and molecular segment displacement activation energy of the binding belt at different compatibility test times, the glass transition temperature and molecular segment displacement activation energy at different test times are compared to obtain the evaluation results.

4. A capacitor binding tape and impregnant compatibility evaluation system based on the capacitor binding tape and impregnant compatibility evaluation method based on dynamic thermomechanical analysis according to claim 1, characterized in that: include: Compatibility test module: used to immerse capacitor binding tape in Jarylec C101 for compatibility testing; Dynamic thermomechanical analysis experiment module: used to perform dynamic thermomechanical analysis experiment DMA on samples at each experimental time; Spectrum analysis module: used to perform spectrum analysis on the experimental results of each dynamic thermal mechanical analysis experiment DMA; Evaluation Module: Evaluates the compatibility of capacitor binding tape and impregnant by using the glass transition temperature and molecular segment displacement activation energy of the binding tape at different compatibility test times.

5. A 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 for evaluating the compatibility of a capacitor binding tape with an impregnant according to any one of claims 1 to 3 are implemented.

6. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for evaluating the compatibility of a capacitor binding tape and an impregnating agent according to any one of claims 1 to 3 is implemented.

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