A multi-factor aging test device and method for solid insulating materials

Abstract

The application discloses a kind of solid insulation material multi-factor aging test device and method, device includes: the constant-temperature aging box of real-time temperature regulation, power component and excitation component, the bottom of constant-temperature aging box is provided with the elastic component of bearing, and the test platform of multiple groups of samples can be placed is equipped above elastic component;After exerting preset tension to sample, it is fixed in test platform, and sample is connected with power component and excitation component respectively, power component provides alternating current power, and preset voltage is exerted to sample, and excitation component provides vibration for sample by setting output frequency and intensity.The application realizes the joint aging of electricity, heat and force, can also simulate the situation that electric power device is slightly vibrated and sample is strained when being stressed, can carry out aging separately or superimposed together with above several conditions, and can carry out aging test of multiple samples simultaneously, to realize obtaining accurate test data to carry out solid insulation material life prediction and evaluation.

Description

Technical Field

[0001] This invention belongs to the field of materials testing technology, specifically relating to a multi-factor aging test device and method for solid insulating materials. Background Technology

[0002] Modern power equipment extensively utilizes solid insulating materials, such as composite insulators and transformer oil paper. The performance of these materials often determines the safe and stable operation of the equipment. These solid insulating materials degrade over time due to the influence of electrical, thermal, and mechanical factors (vibration and stress) during operation. Aging assessment and lifespan prediction of solid insulating materials allow for early determination of whether power equipment is operating safely and whether replacement or lifespan extension is necessary. However, the reliable lifespan of most solid insulating materials is several decades, making lifespan assessment impossible in real-world environments. Therefore, accelerated aging simulation is required for lifespan prediction. To simulate the aging process of materials in the laboratory, accelerate the aging process, understand the aging mechanism, and predict equipment lifespan, it is necessary to construct a device for artificial accelerated aging tests in the laboratory.

[0003] Currently, patent CN1402413A discloses a multi-factor aging device and method for stator bars of large motors. The device can simultaneously apply electrical, thermal, mechanical, and thermomechanical aging stresses to the aging motor bars, thereby accelerating sample aging without damaging the aging mechanism and realistically simulating the aging process of the motor bar samples. The electrical aging factor is provided by a step-up transformer, the thermal aging factor by a heating plate, and the thermal aging temperature controlled by a temperature controller; the mechanical vibration stress is provided by a vibrator, and the output excitation force and amplitude can be adjusted to meet different aging requirements. Adjusting the output waveform of the signal generator can change the mode of excitation force. The device simulates the thermomechanical stress generated during motor operation through heating and cooling cycles. It can perform timed hot and cold cycles or hot and cold cycles within a certain temperature range. However, the device is limited to the aging of motor bar stator insulation and can only test a single sample; it cannot simultaneously conduct aging tests on multiple groups of samples.

[0004] For example, patent CN111624431A discloses a multi-sample three-factor aging test device and method for GIS solid insulation. The device includes a test chamber and a sample holder, with the sample holder placed inside the test chamber. The test chamber provides the test environment, and the sample holder loads the samples. It also includes a temperature control module, a vibration module, a pressure module, and a testing module. The temperature control module heats the samples and monitors the temperature; the vibration module provides different vibration intensities and monitors the vibration; the pressure module provides voltage and monitors the voltage; and the testing module monitors the aging state of the samples. This device can perform accelerated aging tests on GIS solid insulation materials using electric field, thermal, and mechanical vibration parameters. However, the overall device is large, does not consider all actual working conditions, lacks information on the effects of stress and strain on materials under real-world conditions, and relies on external heating pipes to heat the insulating oil for temperature control, which can easily lead to uneven temperature control.

[0005] In summary, the multi-factor aging test devices commonly used in the existing technology generally suffer from problems such as large size, high price, and difficulty in disassembly. In addition, devices that provide different test parameters generally need to be customized. They can only achieve single-factor or two-factor aging and are difficult to conduct aging tests under laboratory conditions that simulate the combined effects of multiple factors such as electricity, heat, and force. Furthermore, the conditions of some existing test devices are far from the actual working conditions, and the test data are not rigorous.

[0006] Therefore, how to design a small-sized multi-factor aging test device for solid insulating materials that can simulate multiple aging parameters and conduct multiple sets of tests in parallel, so as to obtain accurate test data for prediction and evaluation of the life of solid insulating materials, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] To address the deficiencies in the existing technology, the present invention provides a multi-factor aging test device and method for solid insulating materials. The device includes a constant temperature aging chamber with real-time temperature adjustment, a power supply component, and a vibration excitation component. After a preset tension is applied to the sample, it is fixed on the test platform. The sample is connected to the power supply component and the vibration excitation component. The power supply component provides AC power and applies a preset voltage to the sample. The vibration excitation component provides vibration to the sample by setting the output frequency and intensity.

[0008] The multi-factor aging test device proposed in this invention, consisting of a temperature module, a vibration module, a tensile module, and a voltage application module, is suitable for accelerated aging experiments on insulating materials, solving the problems of large size and inability to disassemble existing devices. It can not only achieve combined electrical, thermal, and mechanical aging, but also simulate the micro-vibrations of power equipment and the stress-strain conditions of samples. It can perform aging tests on these conditions individually or in combination, and can simultaneously conduct aging tests on multiple samples to obtain accurate test data for predicting and evaluating the lifespan of solid insulating materials.

[0009] In a first aspect, the present invention provides a multi-factor aging test device for solid insulating materials, comprising: a constant temperature aging chamber with real-time temperature adjustment, a power supply component and an excitation component, wherein a load-bearing elastic component is provided at the bottom of the constant temperature aging chamber, and a test platform for placing multiple sets of samples is provided above the elastic component.

[0010] After applying a preset tension to the sample, it is fixed to the test platform. The sample is connected to the power supply component and the excitation component respectively. The power supply component provides AC power and applies a preset voltage to the sample. The excitation component provides vibration to the sample by setting the output frequency and intensity.

[0011] Furthermore, the test platform includes a base plate and a slide rail. Multiple elastic components are installed under the base plate, which is horizontally positioned. The slide rail is bolted to the base plate and positioned above the base plate. Multiple sets of samples are installed on the slide rail for multi-factor aging tests. The vibration excitation component is fixedly connected to the base plate through a linkage rod and generates vibration by transmitting the vibration to multiple sets of samples through the base plate.

[0012] Furthermore, the testing platform also includes sample clamps and sliders. Multiple sliders are set in pairs on the slide rail. The sample clamps correspond one-to-one with the sliders and are vertically installed above the sliders. The two ends of the sample are fixed on the two sample clamps in the same group. The interval between each group of sliders is ≥1 / 4L, and the interval between each slider and the inner wall of the constant temperature aging chamber is ≥5 / 4L, where L is the length of the sample.

[0013] Electrodes are provided at both ends of the sample. The electrodes at both ends of the same sample form an electrode group. The two electrodes of each electrode group are connected to the positive and negative terminals of the power supply component, respectively. Each connected electrode group is connected in parallel with the power supply component.

[0014] Furthermore, the sample clamp is a push-pull clamp, which is connected to a tension sensor, and the opening size of the push-pull clamp is ≤3mm.

[0015] Furthermore, the base plate is made of insulating material, and the slide rails, sample clamps, and sliders are all made of insulating metal materials.

[0016] Furthermore, the excitation assembly includes a vibrator, a power amplifier, and a signal generator connected in sequence, as well as an acceleration sensor connected to the base plate. The signal generator and power amplifier set the output frequency and intensity of the vibrator. The vibrator is connected to a linkage rod. The acceleration sensor senses the vibration signal of the base plate and feeds the vibration signal back to the signal generator, adjusting the frequency and intensity of the excitation signal emitted by the signal generator.

[0017] Secondly, the present invention also provides a multi-factor aging test method for solid insulating materials, employing the multi-factor aging test apparatus for solid insulating materials as described above, comprising the following steps:

[0018] Multiple sets of samples that need to undergo aging tests are placed on the test platform;

[0019] A preset tension is applied to the sample, and it is then fixed to the test platform;

[0020] Set the frequency and voltage output of the power supply component according to the aging test parameters;

[0021] The output frequency and intensity are set by the excitation component, and the output frequency and intensity are adjusted by real-time monitoring of the vibration frequency feedback of the test platform.

[0022] After the frequency and voltage output by the power supply component and the output frequency and intensity of the excitation component are stable and there is no discharge phenomenon, the constant temperature aging chamber is heated to the preset temperature.

[0023] After the preset time has elapsed, the sample is removed to complete the aging test.

[0024] Furthermore, the testing platform also includes sample clamps and sliders. Multiple sliders are set in pairs on the slide rail, and the sample clamps correspond one-to-one with the sliders and are vertically installed above the sliders. The two ends of the sample are fixed on the two sample clamps in the same group respectively.

[0025] Apply a preset tensile force to the sample and fix it to the test platform, specifically including:

[0026] Label the two sliders in the same group as slider 1 and slider 2, respectively.

[0027] The first slider is locked to the test platform, and the second slider is connected to the tension sensor.

[0028] Pulling the tension sensor moves the second slider. When the tension of the tension sensor reaches the preset value, the second slider is locked to the test platform.

[0029] Furthermore, the excitation assembly includes a vibrator, a power amplifier, and a signal generator connected in sequence, as well as an accelerometer connected to the test platform. The accelerometer includes a sensitive core and a piezoelectric component.

[0030] Furthermore, the output frequency and intensity are adjusted by real-time monitoring of the vibration frequency feedback of the testing platform, specifically including the following steps:

[0031] The sensitive core collects the vibration acceleration of the test platform during the aging test, and provides mechanical signal data through analysis, which is then transmitted to the piezoelectric component.

[0032] When a piezoelectric component is subjected to a mechanical signal, a charge signal data is formed on its surface, and this charge signal data is transmitted to a signal generator. The specific relationship between the charge signal and the mechanical signal is as follows:

[0033]

[0034] Where U is the voltage signal output by the piezoelectric component, dz is the piezoelectric coefficient of the piezoelectric component in the z direction, h is the thickness of the piezoelectric component, M is the mass of the test platform, a is the acceleration of the test platform, γ is the relative permittivity of the piezoelectric component, β is the vacuum permittivity, and S is the surface area of ​​the upper surface of the piezoelectric component.

[0035] The signal generator is based on the analysis of the charge signal and the output of the power amplifier is a variable frequency current that adjusts the electric force of the exciter.

[0036] The exciter outputs electrodynamic force to the test platform in real time based on the value of the variable frequency current, thus providing the vibration acceleration of the test platform;

[0037] The exciter, based on the value of the variable frequency current, outputs electrodynamic force to the test platform in real time, providing the vibration acceleration of the test platform. The specific relationship is as follows:

[0038]

[0039] Where λ is the dynamic constant of the exciter, I is the variable frequency current output from the signal generator and power amplifier to the exciter, g is the vibration acceleration of the test platform, and c i When the time for the exciter to output electrodynamic force occurs during the i-th cycle of the input variable frequency current, and i is an odd number, c i =1, when i is even, c i =-1, k is the elastic coefficient of the elastic component, x i Let be the displacement of the elastic component in the i-th cycle.

[0040] The present invention provides a multi-factor aging test apparatus and method for solid insulating materials, which has at least the following beneficial effects:

[0041] (1) This invention can not only achieve combined aging of electricity, heat and force, but also simulate the situation of small vibration of power equipment and strain of sample under stress. It can age the above situations individually or in combination, and can conduct aging tests on multiple samples at the same time to obtain accurate test data for prediction and evaluation of the life of solid insulation materials.

[0042] (2) The push-pull force clamp can not only fasten the sample, but also work with the tension sensor to control the application of a preset tension, accurately simulating the stress situation in actual application scenarios.

[0043] (3) A piezoelectric accelerometer is used to feed back the vibration signal of the base plate, and the signal is output through a signal generator and a power amplifier. The vibration of the base plate is adjusted in real time by the exciter. The signal generator outputs a stable sinusoidal signal, and the power amplifier can output a current signal from zero. By controlling the output level, the vibration signal can be controlled, thereby accurately simulating the vibration scenario of the actual working condition. Attached Figure Description

[0044] Figure 1 A structural diagram of a multi-factor aging test device for solid insulating materials provided by the present invention;

[0045] Figure 2 A schematic diagram of the installation structure of multiple samples on a test platform according to a certain embodiment of the present invention;

[0046] Figure 3 A schematic diagram of a multi-factor aging test method for solid insulating materials provided by the present invention;

[0047] Figure 4 This is a schematic diagram of the process for adjusting the output frequency and intensity of the test platform vibration frequency feedback according to a certain embodiment of the present invention.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1-Constant temperature aging chamber, 2-Power supply assembly, 3-Vibrator, 4-Power amplifier, 5-Signal generator, 6-Linkage rod, 7-Sample clamp, 8-Sample, 9-Slider, 10-Slide rail, 11-Base plate, 12-Elastic component, 13-Acceleration sensor, 14-Electrode assembly. Detailed Implementation

[0050] To better understand the above technical solutions, a detailed description of the solutions will be provided below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0051] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0052] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0053] The present invention provides a multi-factor aging test device for solid insulating materials, comprising: a constant temperature aging chamber 1 with real-time temperature adjustment, a power supply component 2 and an excitation component, wherein a load-bearing elastic component 12 is provided at the bottom of the constant temperature aging chamber 1, and a test platform for placing multiple sets of samples is provided above the elastic component 12.

[0054] After applying a preset tension to the sample, it is fixed to the test platform, and the sample is connected to the power supply component 2 and the excitation component respectively. The power supply component 2 provides AC power and applies a preset voltage to the sample. The excitation component provides vibration to the sample by setting the output frequency and intensity.

[0055] The test platform includes a base plate 11 and a slide rail 10. Multiple elastic components are installed under the base plate 11. The base plate 11 is horizontally set. The slide rail 10 is bolted to the base plate 11 and is set above the base plate 11. Multiple sets of samples are installed on the slide rail 10 for multi-factor aging tests. The vibration excitation component is fixedly connected to the base plate 11 through the linkage rod 6 and generates vibration by driving the base plate 11 to transmit the vibration to multiple sets of samples.

[0056] The aging test is conducted in a constant temperature aging chamber 1, where the temperature can be freely adjusted and maintained at a uniform temperature after adjustment. The vibration assembly is fixed to the base plate 11 via a linkage rod 6, which can drive the entire base plate 11 to vibrate, while providing vibration frequency and intensity for multiple groups of samples.

[0057] like Figure 1-2 As shown, the test platform also includes sample clamps 7 and sliders 9. Multiple sliders 9 are arranged in pairs on the slide rail 10. The sample clamps 7 correspond one-to-one with the sliders 9 and are vertically installed above the sliders 9. The two ends of the sample are fixed on the two sample clamps 7 in the same group respectively. The interval between each group of sliders 9 is ≥1 / 4L, and the interval between each slider 9 and the inner wall of the constant temperature aging chamber 1 is ≥5 / 4L, where L is the length of the sample.

[0058] Electrodes are provided at both ends of the sample. The electrodes at both ends of the same sample form an electrode group 14. The two electrodes of each electrode group 14 are connected to the positive and negative terminals of the power supply component 2, respectively. Each connected electrode group 14 is connected in parallel with the power supply component 2.

[0059] The electrode can be a copper foil electrode. The slider 9 can move freely on the slide rail 10. By pulling the sample clamp 7, the slider 9 is moved and a predetermined tension is applied to the sample before the slider 9 is fixed. The predetermined tension value applied to the sample can be preset according to the specific test scenario. The tension value applied to different test scenarios and different sample materials will also be different, and no further limitation is made here.

[0060] Power supply component 2 is selected as AC power supply, which provides the voltage required for the aging test of the sample.

[0061] Sample clamp 7 is a push-pull clamp, which is connected to a tension sensor. The opening size of the push-pull clamp is ≤3mm. The tension sensor outputs the tension in real time. After applying the tension value set for the aging test to the sample, the slider 9 is locked and fixed.

[0062] The base plate 11 is made of insulating material, and the slide rail 10, sample clamp 7 and slider 9 are all made of metal materials that have been insulated. All metal parts are insulated to avoid discharge phenomena that could affect the accuracy of the test results.

[0063] The excitation assembly includes a vibrator 3, a power amplifier 4, and a signal generator 5 connected in sequence, as well as an acceleration sensor 13 connected to the base plate 11. The signal generator 5 and the power amplifier 4 set the output frequency and intensity of the vibrator 3. The vibrator 3 is connected to a linkage rod 6. The acceleration sensor 13 senses the vibration signal of the base plate 11 and feeds the vibration signal back to the signal generator, adjusting the frequency and intensity of the excitation signal emitted by the signal generator 5.

[0064] The multi-factor aging test device proposed in this invention, consisting of a temperature module, a vibration module, a tensile module, and a voltage application module, is suitable for accelerated aging experiments on insulating materials, solving the problems of large size and inability to disassemble existing devices. It can not only achieve combined electrical, thermal, and mechanical aging, but also simulate the micro-vibrations of power equipment and the stress-strain conditions of samples. It can perform aging tests on these conditions individually or in combination, and can simultaneously conduct aging tests on multiple samples to obtain accurate test data for predicting and evaluating the lifespan of solid insulating materials.

[0065] like Figure 3 As shown, the present invention also provides a multi-factor aging test method for solid insulating materials, employing the methods described above. Figure 1-2 The multi-factor aging test apparatus for solid insulating materials shown includes the following steps in its aging test method:

[0066] Multiple sets of samples that need to undergo aging tests are placed on the test platform;

[0067] A preset tension is applied to the sample, and it is then fixed to the test platform;

[0068] Set the frequency and voltage output of the power supply component according to the aging test parameters;

[0069] Electrodes are provided at both ends of the sample. The electrodes at both ends of the same sample form an electrode group. The two electrodes of each electrode group are connected to the positive and negative terminals of the power supply component, respectively. Each connected electrode group is connected in parallel with the power supply component.

[0070] The output frequency and intensity are set by the excitation component, and the output frequency and intensity are adjusted by real-time monitoring of the vibration frequency feedback of the test platform.

[0071] After the frequency and voltage output by the power supply component and the output frequency and intensity of the excitation component are stable and there is no discharge phenomenon, the constant temperature aging chamber is heated to the preset temperature.

[0072] After the preset time has elapsed, the sample is removed to complete the aging test.

[0073] The testing platform also includes sample clamps and sliders. Multiple sliders are set in pairs on the slide rail. The sample clamps correspond one-to-one with the sliders and are vertically installed above the sliders. The two ends of the sample are fixed on the two sample clamps in the same group. The interval between each group of sliders is ≥1 / 4L, and the interval between each slider and the inner wall of the constant temperature aging chamber is ≥5 / 4L, where L is the length of the sample.

[0074] Apply a preset tensile force to the sample and fix it to the test platform, specifically including:

[0075] Label the two sliders in the same group as slider 1 and slider 2, respectively.

[0076] The first slider is locked to the test platform, and the second slider is connected to the tension sensor.

[0077] Pulling the tension sensor moves the second slider. When the tension of the tension sensor reaches the preset value, the second slider is locked to the test platform.

[0078] Fix the slide rail 10 on the base plate 11, install the slider 9 on the slide rail 10, fix the sample in the middle of the same set of clamps 7, move the slider 9 through the clamps 7, and output the tensile force in real time. After applying the tensile force value set for the aging test to the sample, lock and fix the slider 9.

[0079] The excitation assembly includes a vibrator, a power amplifier, and a signal generator connected in sequence, as well as an accelerometer connected to the test platform. The accelerometer includes a sensitive core and a piezoelectric component.

[0080] like Figure 4 As shown, the output frequency and intensity are adjusted by real-time monitoring of the vibration frequency feedback of the test platform, specifically including the following steps:

[0081] The sensitive core collects the vibration acceleration of the test platform during the aging test, and provides mechanical signal data through analysis, which is then transmitted to the piezoelectric component.

[0082] When a piezoelectric component is subjected to a mechanical signal, a charge signal data is formed on its surface, and this charge signal data is transmitted to a signal generator. The specific relationship between the charge signal and the mechanical signal is as follows:

[0083]

[0084] Where U is the voltage signal output by the piezoelectric component, dz is the piezoelectric coefficient of the piezoelectric component in the z direction, h is the thickness of the piezoelectric component, M is the mass of the test platform, a is the acceleration of the test platform, γ is the relative permittivity of the piezoelectric component, β is the vacuum permittivity, and S is the surface area of ​​the upper surface of the piezoelectric component.

[0085] The signal generator is based on the analysis of the charge signal and the output of the power amplifier is a variable frequency current that adjusts the electric force of the exciter.

[0086] The exciter outputs electrodynamic force to the test platform in real time based on the value of the variable frequency current, thus providing the vibration acceleration of the test platform;

[0087] The exciter, based on the value of the variable frequency current, outputs electrodynamic force to the test platform in real time, providing the vibration acceleration of the test platform. The specific relationship is as follows:

[0088]

[0089] Where λ is the dynamic constant of the exciter, I is the variable frequency current output from the signal generator and power amplifier to the exciter, g is the vibration acceleration of the test platform, and c i When the time for the exciter to output electrodynamic force occurs during the i-th cycle of the input variable frequency current, and i is an odd number, c i =1, when i is even, c i =-1, k is the elastic coefficient of the elastic component, x i Let be the displacement of the elastic component in the i-th cycle.

[0090] Therefore, the signal generator 5 and the power amplifier 4 set the output frequency and intensity of the exciter 3. The exciter 3 is connected to the linkage rod 6. The acceleration sensor 13 senses the vibration signal of the base plate 11 and feeds the vibration signal back to the signal generator 5, adjusting the frequency and intensity of the excitation signal emitted by the signal generator 5.

[0091] Example:

[0092] In this embodiment, a 40mm × 40mm × 1mm epoxy sample was selected for aging testing. Epoxy samples were chosen because this material is the same as that used in pot-type insulators in the power industry.

[0093] The power supply component applied a voltage of 70% of the normal flashover voltage to the sample. The output vibration frequency provided by the exciter was selected to be 100Hz, the same as the vibration frequency of a normal basin insulator. This is because the amplitude of the basin insulator during operation is only 5×10⁻⁶. -3 To accelerate aging, the parameters were increased by 100 times during the experiment, and the amplitude was controlled at 0.5g.

[0094] The feedback control of vibration frequency and amplitude is achieved through the following steps:

[0095] The sensitive core collects the vibration acceleration of the test platform during the aging test, and provides mechanical signal data through analysis, which is then transmitted to the piezoelectric component.

[0096] When a piezoelectric component is subjected to a mechanical signal, a charge signal data is formed on its surface, and this charge signal data is transmitted to a signal generator. The specific relationship between the charge signal and the mechanical signal is as follows:

[0097]

[0098] Where U is the voltage signal output by the piezoelectric component, dz is the piezoelectric coefficient of the piezoelectric component in the z direction, h is the thickness of the piezoelectric component, M is the mass of the test platform, a is the acceleration of the test platform, γ is the relative permittivity of the piezoelectric component, β is the vacuum permittivity, and S is the surface area of ​​the upper surface of the piezoelectric component.

[0099] The signal generator is based on the analysis of the charge signal and the output of the power amplifier is a variable frequency current that adjusts the electric force of the exciter.

[0100] The exciter outputs electrodynamic force to the test platform in real time based on the value of the variable frequency current, thus providing the vibration acceleration of the test platform;

[0101] The exciter, based on the value of the variable frequency current, outputs electrodynamic force to the test platform in real time, providing the vibration acceleration of the test platform. The specific relationship is as follows:

[0102]

[0103] Where λ is the dynamic constant of the exciter, I is the variable frequency current output from the signal generator and power amplifier to the exciter, g is the vibration acceleration of the test platform, and c i When the time for the exciter to output electrodynamic force occurs during the i-th cycle of the input variable frequency current, and i is an odd number, c i=1, when i is even, c i =-1, k is the elastic coefficient of the elastic component, x i Let be the displacement of the elastic component in the i-th cycle.

[0104] The stress applied to the sample was a tensile force of 6N, and the aging test temperature was controlled below the glass transition temperature of the epoxy resin, with a maximum setting of 130℃.

[0105] In the constant temperature aging chamber of this embodiment, the interval between each set of sliders (i.e., the distance between samples) is at least 10 mm, and the interval between each slider and the inner wall of the constant temperature aging chamber (i.e., the distance between the sample and the inner wall of the constant temperature aging chamber) is at least 50 mm. Up to 18 samples can be tested for aging at the same time.

[0106] After setting the sampling time for the aging test, aging tests were conducted on 18 samples, and relevant parameter data were collected. Based on the parameter data, the life of the pot insulator was predicted and evaluated.

[0107] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.

Claims

1. A multi-factor aging test device for solid insulating materials, characterized in that, include: The constant temperature aging chamber, power supply and vibration components are adjustable in real time. The bottom of the constant temperature aging chamber is equipped with a load-bearing elastic component, and a test platform that can hold multiple sets of samples is provided above the elastic component. After applying a preset tension to the sample, it is fixed to the test platform, and the sample is connected to the power supply component and the excitation component respectively. The power supply component provides AC power and applies a preset voltage to the sample. The excitation component provides vibration to the sample by setting the output frequency and intensity. The test platform includes a base plate and a slide rail. Multiple elastic components are installed under the base plate, which is horizontally positioned. The slide rail is bolted to the base plate and positioned above the base plate. Multiple sets of samples are installed on the slide rail for multi-factor aging tests. The excitation component is fixedly connected to the base plate through a linkage rod and generates vibration by driving the base plate to transmit the vibration to multiple sets of samples, while providing the frequency and intensity of the vibration to multiple sets of samples. The testing platform also includes sample clamps and sliders. Multiple sliders are set in pairs on the slide rail. The sample clamps correspond one-to-one with the sliders and are vertically installed above the sliders. The two ends of the sample are fixed on the two sample clamps in the same group, respectively. The sample clamp is a push-pull force clamp, which is connected to a tension sensor. The tension sensor outputs the tension magnitude in real time. After applying the tension value set for the aging test to the sample, the slider is locked and fixed. The vibration excitation assembly includes a vibrator, a power amplifier, and a signal generator connected in sequence, as well as an acceleration sensor connected to the base plate. The signal generator and the power amplifier set the output frequency and intensity of the vibrator. The vibrator is connected to a linkage rod. The acceleration sensor senses the vibration signal of the base plate and feeds the vibration signal back to the signal generator, adjusting the frequency and intensity of the excitation signal emitted by the signal generator. The signal generator is based on the analysis of the charge signal and the output of the power amplifier is a variable frequency current that adjusts the electric force of the exciter. The exciter outputs electrodynamic force to the test platform in real time based on the value of the variable frequency current, thus providing the vibration acceleration of the test platform; The exciter, based on the value of the variable frequency current, outputs electrodynamic force to the test platform in real time, providing the vibration acceleration of the test platform. The specific relationship is as follows: ； Where λ is the dynamic constant of the exciter, I is the variable frequency current output from the signal generator and power amplifier to the exciter, g is the vibration acceleration of the test platform, and c i When the time for the exciter to output electrodynamic force occurs during the i-th cycle of the input variable frequency current, and i is an odd number, c i =1, when i is even, c i =-1, k is the elastic coefficient of the elastic component, x i Let M be the displacement of the elastic component in the i-th cycle, M be the mass of the test platform, and a be the acceleration of the test platform being detected.

2. The multi-factor aging test apparatus for solid insulating materials as described in claim 1, characterized in that, The spacing between each group of sliders is ≥1 / 4L, and the spacing between each slider and the inner wall of the constant temperature aging chamber is ≥5 / 4L, where L is the length of the sample; Electrodes are provided at both ends of the sample. The electrodes at both ends of the same sample form an electrode group. The two electrodes of each electrode group are connected to the positive and negative terminals of the power supply component, respectively. Each connected electrode group is connected in parallel with the power supply component.

3. The multi-factor aging test apparatus for solid insulating materials as described in claim 1, characterized in that, The opening size of the push-pull clamp is ≤3mm.

4. The multi-factor aging test apparatus for solid insulating materials as described in claim 1, characterized in that, The base plate is made of insulating material, while the slide rails, sample clamps, and sliders are all made of insulating metal.

5. A multi-factor aging test method for solid insulating materials, characterized in that, The multi-factor aging test apparatus for solid insulating materials as described in any one of claims 1-4 includes the following steps: Multiple sets of samples that need to undergo aging tests are placed on the test platform; A preset tension is applied to the sample, and it is then fixed to the test platform; Set the frequency and voltage output of the power supply component according to the aging test parameters; The output frequency and intensity are set by the excitation component, and the output frequency and intensity are adjusted by real-time monitoring of the vibration frequency feedback of the test platform. After the frequency and voltage output by the power supply component and the output frequency and intensity of the excitation component are stable and there is no discharge phenomenon, the constant temperature aging chamber is heated to the preset temperature. After the preset time has elapsed, the sample is removed to complete the aging test.

6. The multi-factor aging test method for solid insulating materials as described in claim 5, characterized in that, The testing platform also includes sample clamps and sliders. Multiple sliders are set in pairs on the slide rail. The sample clamps correspond one-to-one with the sliders and are vertically installed above the sliders. The two ends of the sample are fixed on the two sample clamps in the same group, respectively. Apply a preset tensile force to the sample and fix it to the test platform, specifically including: Label the two sliders in the same group as slider 1 and slider 2, respectively. The first slider is locked to the test platform, and the second slider is connected to the tension sensor. Pulling the tension sensor moves the second slider. When the tension of the tension sensor reaches the preset value, the second slider is locked to the test platform.

7. The multi-factor aging test method for solid insulating materials as described in claim 6, characterized in that, The excitation assembly includes a vibrator, a power amplifier, and a signal generator connected in sequence, as well as an accelerometer connected to the test platform. The accelerometer includes a sensitive core and a piezoelectric component.

8. The multi-factor aging test method for solid insulating materials as described in claim 7, characterized in that, Adjusting the output frequency and intensity by monitoring the vibration frequency feedback of the test platform in real time includes the following steps: The sensitive core collects the vibration acceleration of the test platform during the aging test, and provides mechanical signal data through analysis, which is then transmitted to the piezoelectric component. When a piezoelectric component is subjected to a mechanical signal, a charge signal data is formed on its surface, and this charge signal data is transmitted to a signal generator. The specific relationship between the charge signal and the mechanical signal is as follows: ； Where U is the voltage signal output by the piezoelectric component, dz is the piezoelectric coefficient of the piezoelectric component in the z direction, h is the thickness of the piezoelectric component, M is the mass of the test platform, a is the acceleration of the test platform, γ is the relative permittivity of the piezoelectric component, β is the vacuum permittivity, and S is the surface area of ​​the upper surface of the piezoelectric component. The signal generator is based on the analysis of the charge signal and the output of the power amplifier is a variable frequency current that adjusts the electric force of the exciter. The exciter outputs electrodynamic force to the test platform in real time based on the value of the variable frequency current, thus providing the vibration acceleration of the test platform; The exciter, based on the value of the variable frequency current, outputs electrodynamic force to the test platform in real time, providing the vibration acceleration of the test platform. The specific relationship is as follows: ； Where λ is the dynamic constant of the exciter, I is the variable frequency current output from the signal generator and power amplifier to the exciter, g is the vibration acceleration of the test platform, and c i When the time for the exciter to output electrodynamic force occurs during the i-th cycle of the input variable frequency current, and i is an odd number, c i =1, when i is even, c i =-1, k is the elastic coefficient of the elastic component, x i Let be the displacement of the elastic component in the i-th cycle.

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