CN115791473A - Solid insulating material multi-factor aging test device and method - Google Patents
Solid insulating material multi-factor aging test device and method Download PDFInfo
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Abstract
The invention discloses a solid insulating material multifactor aging test device and a method thereof, wherein the device comprises: the temperature control device comprises a constant temperature aging box capable of adjusting temperature in real time, a power supply component and an excitation component, wherein the bottom of the constant temperature aging box is provided with a load-bearing elastic component, and a test platform capable of placing a plurality of groups of samples is arranged above the elastic component; after exerting predetermined pulling force to the sample, be fixed in test platform, and the sample is connected with power supply module, excitation subassembly respectively, and power supply module provides alternating current power supply, applys predetermined voltage to the sample, and the excitation subassembly provides the vibration for the sample through setting for output frequency and intensity. The invention realizes the combined aging of electricity, heat and force, can simulate the conditions of micro vibration of a power device and the stress and strain of a sample, can age the conditions singly or together in an overlapping way, and can simultaneously carry out the aging test of a plurality of samples so as to realize the purpose of obtaining accurate test data to predict and evaluate the service life of the solid insulating material.
Description
Technical Field
The invention belongs to the technical field of material testing, and particularly relates to a solid insulating material multi-factor aging test device and method.
Background
Solid insulating materials such as composite insulators and transformer oil paper are used in modern power equipment in a large quantity, the performance of the solid insulating materials generally determines whether the power equipment can safely and stably operate, and the solid insulating materials are influenced by factors such as electricity, heat and force (vibration and stress) in the operation process and can be deteriorated with time. By carrying out aging evaluation and life prediction on the solid insulating material, whether the power equipment is safely operated, whether the power equipment needs to be replaced or the service life is prolonged and the like can be judged in advance. However, most solid insulating materials have a reliable life as long as decades or even decades, and cannot be life-estimated depending on real environments, and therefore, life prediction through accelerated aging simulation is required. In order to simulate the aging process and the accelerated aging progress of materials in a laboratory, so as to understand the aging mechanism and predict the service life of equipment, a device for carrying out an artificial accelerated aging test needs to be built in the laboratory.
At present, for example, patent CN1402413A provides a multifactor aging device and an aging method for a large-scale motor stator bar, the device can apply electrical, thermal, mechanical and thermomechanical aging stress to an aged motor bar at the same time, so as to accelerate sample aging, not destroy the aging mechanism of the sample, and truly simulate the aging process of the motor bar sample. The electrical aging factor is provided by a step-up transformer, the thermal aging factor is provided by a heating plate, and a temperature controller controls the thermal aging temperature; the mechanical vibration stress is provided by the vibration exciter, the output exciting force and the amplitude can be adjusted to meet different aging requirements, and the mode of the exciting force can be changed by adjusting the output waveform of the signal generator. The thermal mechanical stress generated in the operation of the motor is simulated through heating and cooling circulation, and the cooling and heating circulation can be performed at regular time, and also can be performed in a certain temperature range, but the device is only limited to the aging of the motor bar stator insulation, and only a single sample can be tested, and the aging test of a plurality of groups of samples cannot be performed simultaneously.
Also for example, patent CN111624431A provides a GIS solid insulation multi-sample three-factor aging test device and a test method, the device includes: proof box and sample support, the sample support sets up in the proof box, and the proof box is used for providing experimental environment, and the sample support is used for the loading sample, still includes: the device comprises a temperature control module, a vibration module, a pressurization module and a test module; the temperature control module is used for heating the sample and monitoring the temperature; the vibration module is used for providing different vibration intensities and monitoring vibration: the pressurizing module is used for providing voltage and monitoring the voltage; the test module is used for monitoring the aging state of the sample. The device can carry out three parameter accelerated aging test of electric field, heat, mechanical oscillation to GIS solid insulating material, but the whole device is bulky, still does not consider the whole condition of operating condition, lacks under the operating condition that the material suffers stress and takes place the influence of various meeting an emergency, and utilizes external heating pipe to carry out temperature control to insulating oil heating, causes the inhomogeneous phenomenon of accuse temperature easily.
In conclusion, the common multi-factor aging test device in the prior art generally has the problems of large volume, high price, difficulty in splitting and the like, devices providing different test parameters generally need to be customized, single-factor or double-factor aging can only be realized, an aging test under the combined action of multiple factors such as electricity, heat and force is difficult to simulate under laboratory conditions, the conditions of some existing test devices are far from actual working conditions, and test data are not strict.
Therefore, how to design a multi-factor aging test device for solid insulating materials, which has a small volume, can superpose and simulate multiple-factor aging parameters, and performs multiple sets of tests in parallel, so as to obtain accurate test data to predict and evaluate the service life of the solid insulating materials is a problem to be solved by those skilled in the art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a solid insulating material multi-factor aging test device and a method, the device is provided with a constant-temperature aging box capable of adjusting the temperature in real time, a power supply component and an excitation component, so that a sample is fixed on a test platform after a preset tensile force is applied to the sample, the sample is respectively connected with the power supply component and the excitation component, the power supply component provides an alternating current power supply, a preset voltage is applied to the sample, and the excitation component provides vibration for the sample by setting the output frequency and the intensity.
The multi-factor aging test device composed of the temperature module, the vibration module, the stretching module and the voltage applying module is suitable for accelerated aging tests of insulating materials, and solves the problems that the existing device is large in size and cannot be disassembled. The aging test device not only can realize the joint aging of electricity, heat and force, but also can simulate the conditions of the power device when micro-vibration and sample stress are strained, can age the above conditions singly or together in a superposition mode, and can simultaneously perform the aging test of a plurality of samples so as to realize the purpose of acquiring accurate test data to predict and evaluate the service life of the solid insulating material.
In a first aspect, the present invention provides a solid insulation material multifactor aging test apparatus, comprising: the temperature control device comprises a constant temperature aging box capable of adjusting temperature in real time, a power supply component and an excitation component, wherein the bottom of the constant temperature aging box is provided with a load-bearing elastic component, and a test platform capable of placing a plurality of groups of samples is arranged above the elastic component;
after exerting predetermined pulling force to the sample, be fixed in test platform, and the sample is connected with power supply module, excitation subassembly respectively, and power supply module provides alternating current power supply, applys predetermined voltage to the sample, and the excitation subassembly provides the vibration for the sample through setting for output frequency and intensity.
Further, test platform includes bottom plate and slide rail, and a plurality of elastic component of bottom plate below installation, bottom plate are the level setting, and the slide rail carries out the bolt fastening with the bottom plate, sets up in the bottom plate top, and multiunit sample is installed and is carried out multifactor ageing tests on the slide rail, and the excitation subassembly passes through trace and bottom plate fixed connection to through driving the bottom plate conduction to the multiunit sample produces the vibration.
Furthermore, the test platform also comprises a sample clamp and slide blocks, the slide blocks are arranged on the slide rail in a group two by two, the sample clamp corresponds to the slide blocks one by one and is vertically arranged above the slide blocks, two ends of the sample are respectively fixed on the two sample clamps in the same group, the spacing distance between each group of slide blocks is more than or equal to 1/4L, the spacing distance between each slide block and the inner wall of the constant-temperature aging box is more than or equal to 5/4L, and L is the length of the sample;
the two ends of the sample are respectively provided with electrodes, the two ends of the same sample form electrode groups, the two electrodes of each electrode group are respectively connected with the positive end and the negative end of the power supply component, and the electrode groups and the power supply component which are connected in parallel.
Furthermore, the sample clamp is a push-pull force clamp, the push-pull force clamp is connected with a tension sensor, and the size of an opening of the push-pull force clamp is less than or equal to 3mm.
Furthermore, the bottom plate is made of insulating materials, and the sliding rail, the sample clamp and the sliding block are made of metal materials subjected to insulating treatment.
Furthermore, the excitation assembly comprises an exciter, a power amplifier and a signal generator which are sequentially connected, and an acceleration sensor connected with the bottom plate, wherein the signal generator and the power amplifier set output frequency and strength for the exciter, the exciter is connected with the linkage rod, the acceleration sensor senses a vibration signal of the bottom plate and feeds the vibration signal back to the signal generator, and the frequency and the strength of the excitation signal sent by the signal generator are adjusted.
In a second aspect, the present invention further provides a solid insulation material multifactor aging test method, which adopts the solid insulation material multifactor aging test apparatus, and includes the following steps:
placing a plurality of groups of samples needing to be subjected to an aging test on a test platform;
exerting a preset tension on the sample, and fixing the sample on a test platform;
setting the frequency and voltage output by the power supply assembly according to the aging test parameters;
setting output frequency and intensity through the excitation assembly, and adjusting the output frequency and intensity through the vibration frequency feedback of the real-time monitoring test platform;
after the frequency and the voltage output by the power supply assembly and the output frequency and the intensity of the excitation assembly are stable and have no discharge phenomenon, the constant-temperature aging box is heated to a preset temperature;
and after the preset time is reached, taking out the sample, and finishing the aging test.
The test platform further comprises a sample clamp and sliding blocks, the sliding blocks are arranged on the sliding rail in a group two by two, the sample clamp corresponds to the sliding blocks one by one and is vertically arranged above the sliding blocks, and two ends of a sample are respectively fixed on the two sample clamps in the same group;
exert predetermined pulling force to the sample to be fixed in test platform, specifically include:
marking the two sliders in the same group as a first slider and a second slider respectively;
the first sliding block is locked with the test platform, and the second sliding block is connected with the tension sensor;
pulling the tension sensor to drive the second sliding block to move, wherein the tension of the tension sensor reaches a preset value, and the second sliding block is locked with the test platform.
Furthermore, the excitation assembly comprises a vibration exciter, a power amplifier and a signal generator which are sequentially connected, and an acceleration sensor connected with the test platform, wherein the acceleration sensor comprises a sensitive core body and a piezoelectric assembly.
Further, the output frequency and the intensity are adjusted by monitoring the vibration frequency feedback of the test platform in real time, and the method specifically comprises the following steps:
the sensitive core body collects the vibration acceleration of the test platform in the aging test process, gives out mechanical signal data through analysis and transmits the mechanical signal data to the piezoelectric assembly;
the piezoelectric component is acted by mechanical signals, charge signal data are formed on the surface of the piezoelectric component and transmitted to the signal generator, and the relationship between the charge signals and the mechanical signals is as follows:
u is a voltage signal output by the piezoelectric component, dz is a 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 to be detected, gamma is the relative dielectric constant of the piezoelectric component, beta is the vacuum dielectric constant, and S is the surface area of the upper surface of the piezoelectric component;
the signal generator outputs a variable frequency current for adjusting the electrodynamic force of the vibration exciter with the power amplifier based on the analysis of the charge signal;
the vibration exciter outputs electric power to the test platform in real time based on the numerical value of the variable frequency current, and provides the vibration acceleration of the test platform;
the vibration exciter outputs electrodynamic force to the test platform in real time based on the numerical value of variable frequency current, and provides the vibration acceleration of the test platform, wherein the specific relation is as follows:
wherein, λ is the dynamic constant of the vibration exciter, I is the variable frequency current output to the vibration exciter by the signal generator and the power amplifier, g is the vibration acceleration of the test platform, c i When the output electric power of the exciter is in the ith period of input variable frequency current and i is odd number, c i If =1,i is an even number, c i = -1,k elastic modulus of elastic component, x i The displacement of the elastic element in the ith period.
The solid insulating material multi-factor aging test device and the method provided by the invention at least have the following beneficial effects:
(1) The invention can not only realize the combined aging of electricity, heat and force, but also simulate the conditions of electric power device micro-vibration and sample strain under stress, can age the conditions singly or together in a superposition way, and can simultaneously carry out the aging test of a plurality of samples so as to realize the purpose of obtaining accurate test data to predict and evaluate the service life of the solid insulating material.
(2) The push-pull force clamp can not only fasten a sample, but also be matched with a tension sensor to control and apply a preset tension, and accurately simulates the stress condition in an actual application scene.
(3) The piezoelectric acceleration sensor is used for feeding back a vibration signal of the bottom plate, the signal generator and the power amplifier are used for outputting a signal, and the vibration exciter is used for adjusting the vibration of the bottom plate in real time. The signal generator outputs stable sinusoidal signals, the power amplifier can output current signals from zero, and the purpose of controlling vibration signals can be achieved by controlling output levels, so that the vibration scene of actual working conditions can be accurately simulated.
Drawings
FIG. 1 is a structural diagram of a multi-factor aging test device for solid insulating materials, which is provided by the invention;
FIG. 2 is a schematic diagram of a mounting structure of a plurality of sets of samples on a testing platform according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a multi-factor aging test method for solid insulation material according to the present invention;
fig. 4 is a schematic flow chart of adjusting the output frequency and the intensity by the test platform vibration frequency feedback according to an embodiment of the present invention.
Description of the reference numerals:
1-constant temperature aging box, 2-power supply component, 3-vibration exciter, 4-power amplifier, 5-signal generator, 6-linkage rod, 7-sample clamp, 8-sample, 9-slide block, 10-slide rail, 11-bottom plate, 12-elastic component, 13-acceleration sensor and 14-electrode component.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrases "comprising one of \8230;" does not exclude the presence of additional like elements in an article or device comprising the element.
The invention provides a solid insulating material multifactor aging test device, comprising: the device comprises a constant-temperature aging box 1 capable of adjusting temperature in real time, a power supply component 2 and an excitation component, wherein the bottom of the constant-temperature aging box 1 is provided with a load-bearing elastic component 12, and a test platform capable of placing a plurality of groups of samples is arranged above the elastic component 12;
after exerting predetermined pulling force to the sample, be fixed in test platform, and the sample is connected with power supply module 2, excitation subassembly respectively, and power supply module 2 provides alternating current power supply, applys predetermined voltage to the sample, and the excitation subassembly provides the vibration for the sample through setting for output frequency and intensity.
The test platform comprises a bottom plate 11 and a slide rail 10, wherein a plurality of elastic assemblies are installed below the bottom plate 11, the bottom plate 11 is horizontally arranged, the slide rail 10 and the bottom plate 11 are fixed through bolts and arranged above the bottom plate 11, a plurality of groups of samples are installed on the slide rail 10 to perform a multi-factor aging test, and the vibration exciting assembly is fixedly connected with the bottom plate 11 through a linkage rod 6 and conducts vibration to the plurality of groups of samples through driving the bottom plate 11.
The aging test is carried out in the constant-temperature aging box 1, the temperature in the constant-temperature aging box 1 can be freely adjusted, and the balance of the adjusted temperature is kept. The vibration exciting assembly is fixed on the bottom plate 11 through the linkage rod 6, and can drive the whole bottom plate 11 to vibrate and provide vibration frequency and strength for a plurality of groups of samples.
As shown in fig. 1-2, the testing platform further comprises a sample clamp 7 and a slide block 9, wherein the slide blocks 9 are arranged on the slide rail 10 in a group two by two, the sample clamp 7 corresponds to the slide block 9 one by one and is vertically arranged above the slide block 9, two ends of a sample are respectively fixed on the two sample clamps 7 in the same group, the spacing distance between each group of slide blocks 9 is not less than 1/4L, the spacing distance between each slide block 9 and the inner wall of the constant temperature aging box 1 is not less than 5/4L, and L is the length of the sample;
the two ends of the sample are respectively provided with electrodes, the two ends of the same sample form electrode groups 14, the two electrodes of each electrode group 14 are respectively connected with the positive end and the negative end of the power supply assembly 2, and the electrode groups 14 and the power supply assembly 2 which are connected in parallel are arranged.
The electrode can select the copper foil electrode for use, and slider 9 can freely remove on slide rail 10, and through drawing sample anchor clamps 7 and drive slider 9 and remove, fixed slider 9 after exerting predetermined pulling force to the sample. The predetermined tension value applied by the sample can be preset according to a specific test scene, and the tension values applied by different sample materials in different test scenes are different, and are not further limited herein.
The power supply assembly 2 selects an alternating current power supply which provides the voltage required by the aging test for the sample.
The sample clamp 7 is a push-pull force clamp which is connected with a tension sensor, and the opening size of the push-pull force clamp is less than or equal to 3mm. The tension sensor outputs tension in real time, and the sliding block 9 is locked and fixed after a sample is applied to a tension value set by an aging test.
The bottom plate 11 is made of an insulating material, the slide rail 10, the sample clamp 7 and the slide block 9 are made of metal materials which are subjected to insulating treatment, and metal-containing parts are subjected to insulating treatment to avoid the phenomenon of discharging and influence the accuracy of a test result.
The excitation assembly comprises an exciter 3, a power amplifier 4, a signal generator 5 and an acceleration sensor 13, wherein the exciter 3, the power amplifier 4 and the signal generator 5 are sequentially connected, the acceleration sensor 13 is connected with the bottom plate 11, the signal generator 5 and the power amplifier 4 set output frequency and intensity for the exciter 3, the exciter 3 is connected with the linkage rod 6, the acceleration sensor 13 senses a vibration signal of the bottom plate 11 and feeds the vibration signal back to the signal generator, and the frequency and intensity of the excitation signal sent by the signal generator 5 are adjusted.
The multi-factor aging test device composed of the temperature module, the vibration module, the stretching module and the voltage applying module is suitable for accelerated aging tests of insulating materials, and solves the problems that the existing device is large in size and cannot be disassembled. The aging test device not only can realize the joint aging of electricity, heat and force, but also can simulate the conditions of the power device when micro-vibration and sample stress are strained, can age the above conditions singly or together in a superposition mode, and can simultaneously perform the aging test of a plurality of samples so as to realize the purpose of acquiring accurate test data to predict and evaluate the service life of the solid insulating material.
As shown in fig. 3, the present invention further provides a multi-factor aging test method for solid insulating materials, which uses the multi-factor aging test apparatus for solid insulating materials shown in fig. 1-2, and the aging test method comprises the following steps:
placing a plurality of groups of samples needing to be subjected to an aging test on a test platform;
applying a preset tension to the sample, and fixing the sample on a test platform;
setting the frequency and the voltage output by the power supply assembly according to the aging test parameters;
electrodes are respectively arranged at two ends of the sample, the electrodes at two ends of the same sample form electrode groups, two electrodes of each electrode group are respectively connected with the positive end and the negative end of the power supply assembly, and the electrode groups and the power supply assembly which are connected in parallel.
Setting output frequency and intensity through the excitation assembly, and adjusting the output frequency and intensity through the vibration frequency feedback of the real-time monitoring test platform;
after the frequency and the voltage output by the power supply assembly and the output frequency and the intensity of the excitation assembly are stable and have no discharge phenomenon, the constant-temperature aging box is heated to a preset temperature;
and after the preset time is reached, taking out the sample, and finishing the aging test.
The test platform further comprises a sample clamp and sliding blocks, the sliding blocks are arranged on the sliding rails in a group two by two, the sample clamp corresponds to the sliding blocks one by one and is vertically arranged above the sliding blocks, two ends of a sample are respectively fixed on the two sample clamps in the same group, the spacing distance between each group of sliding blocks is not less than 1/4L, the spacing distance between each sliding block and the inner wall of the constant-temperature aging box is not less than 5/4L, and L is the length of the sample;
exert predetermined pulling force to the sample to be fixed in test platform, specifically include:
marking the two sliders in the same group as a first slider and a second slider respectively;
the first sliding block is locked with the test platform, and the second sliding block is connected with the tension sensor;
pulling the tension sensor to drive the second sliding block to move, wherein the tension of the tension sensor reaches a preset value, and the second sliding block is locked with the test platform.
Fixing a slide rail 10 on a bottom plate 11, installing a slide block 9 on the slide rail 10, fixing a sample in the middle of the same group of clamps 7, driving the slide block 9 to move through the clamps 7, outputting the tension magnitude in real time by a tension sensor, and locking and fixing the slide block 9 after applying a tension value set by an aging test to the sample.
The excitation assembly comprises a vibration exciter, a power amplifier, a signal generator and an acceleration sensor, wherein the vibration exciter, the power amplifier and the signal generator are sequentially connected, the acceleration sensor is connected with the test platform, and the acceleration sensor comprises a sensitive core body and a piezoelectric assembly.
As shown in fig. 4, the output frequency and the intensity are adjusted by monitoring the vibration frequency feedback of the test platform in real time, which specifically includes the following steps:
the sensitive core body collects the vibration acceleration of the test platform in the aging test process, gives out mechanical signal data through analysis, and transmits the mechanical signal data to the piezoelectric assembly;
the piezoelectric component is acted by mechanical signals, charge signal data are formed on the surface of the piezoelectric component and transmitted to the signal generator, and the relationship between the charge signals and the mechanical signals is as follows:
u is a voltage signal output by the piezoelectric component, dz is a 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 to be detected, gamma is the relative dielectric constant of the piezoelectric component, beta is the vacuum dielectric constant, and S is the surface area of the upper surface of the piezoelectric component;
the signal generator outputs a variable frequency current for adjusting the electrodynamic force of the vibration exciter with the power amplifier based on the analysis of the charge signal;
the vibration exciter outputs electric power to the test platform in real time based on the numerical value of the variable frequency current, and provides the vibration acceleration of the test platform;
the vibration exciter outputs electrodynamic force to the test platform in real time based on the numerical value of variable frequency current, and provides the vibration acceleration of the test platform, wherein the specific relation is as follows:
wherein, λ is the dynamic constant of the vibration exciter, I is the variable frequency current output to the vibration exciter by the signal generator and the power amplifier, g is the vibration acceleration of the test platform, c i When the output electric power of the vibration exciter is in the ith period of input variable frequency current and i is odd number, c i If =1,i is an even number, c i =1,k is the modulus of elasticity, x, of the elastic component i The displacement of the elastic element in the ith period.
Therefore, the signal generator 5 and the power amplifier 4 set the output frequency and the output intensity for the vibration exciter 3, the vibration exciter 3 is connected with the linkage rod 6, the acceleration sensor 13 senses the vibration signal of the bottom plate 11 and feeds the vibration signal back to the signal generator 5, and the frequency and the intensity of the vibration exciting signal sent by the signal generator 5 are adjusted.
Example (b):
in this example, an epoxy sample having a size of 40mm × 40mm × 1mm was selected as a sample of the solid insulating material and subjected to an aging test. The epoxy sample was selected considering that the material is the same as the material used for basin insulators in the power industry.
The power supply assembly applies a voltage to the sample which is 70% of the normal flashover voltage, the output vibration frequency provided by the vibration exciter is 100Hz which is the same as the vibration frequency of the normal basin-type insulator, and the amplitude of the basin-type insulator is only 5 multiplied by 10 when the basin-type insulator works -3 g, in order to accelerate aging, parameters are expanded by 100 times during experiment, and the amplitude is controlled to be 0.5g.
Wherein the feedback control of the vibration frequency and amplitude is performed by the steps of:
the sensitive core body collects the vibration acceleration of the test platform in the aging test process, gives out mechanical signal data through analysis, and transmits the mechanical signal data to the piezoelectric assembly;
the piezoelectric component is acted by a mechanical signal, charge signal data are formed on the surface of the piezoelectric component, the charge signal data are transmitted to the signal generator, and the relationship between the charge signal and the mechanical signal is as follows:
u is a voltage signal output by the piezoelectric component, dz is a 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 to be detected, gamma is the relative dielectric constant of the piezoelectric component, beta is the vacuum dielectric constant, and S is the surface area of the upper surface of the piezoelectric component;
the signal generator outputs a variable frequency current for adjusting the electrodynamic force of the vibration exciter with the power amplifier based on the analysis of the charge signal;
the vibration exciter outputs electric power to the test platform in real time based on the numerical value of the variable frequency current, and provides the vibration acceleration of the test platform;
the vibration exciter outputs electrodynamic force to the test platform in real time based on the numerical value of variable frequency current, and provides the vibration acceleration of the test platform, wherein the specific relation is as follows:
wherein, lambda is the dynamic constant of the vibration exciter, I is the variable frequency current output to the vibration exciter by the signal generator and the power amplifier, g is the vibration acceleration of the test platform, and c i When the output electric power of the exciter is in the ith period of input variable frequency current and i is odd number, c i If 1,i is an even number, c i =1,k is the modulus of elasticity, x, of the elastic component i The displacement of the elastic element in the ith period.
The stress applied to the sample is a tensile force of 6N, the aging test temperature is controlled below the glass transition temperature of the epoxy resin, and the maximum temperature is set to be 130 ℃.
In the constant-temperature thermal ageing oven of the embodiment, the spacing distance between each group of sliding blocks (namely the spacing distance between the samples) is at least 10mm, the spacing distance between each sliding block and the inner wall of the constant-temperature ageing oven (namely the spacing distance between the samples and the inner wall of the constant-temperature ageing oven) is at least 50mm, and ageing tests of 18 samples can be simultaneously carried out at most.
And after the sampling time of the aging test is set, the aging test is carried out on 18 samples, relevant parameter data are collected, and the service life of the basin-type insulator is predicted and evaluated according to the parameter data.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A solid insulating material multifactor aging test device is characterized by comprising: the temperature control device comprises a constant temperature aging box capable of adjusting temperature in real time, a power supply component and an excitation component, wherein the bottom of the constant temperature aging box is provided with a load-bearing elastic component, and a test platform capable of placing a plurality of groups of samples is arranged above the elastic component;
after exerting predetermined pulling force to the sample, be fixed in test platform, and the sample is connected with power supply module, excitation subassembly respectively, and power supply module provides alternating current power supply, applys preset voltage to the sample, and the excitation subassembly provides the vibration through setting for output frequency and intensity for the sample.
2. The solid insulation material multifactor aging test device of claim 1, wherein the test platform comprises a bottom plate and a slide rail, a plurality of elastic components are installed below the bottom plate, the bottom plate is horizontally arranged, the slide rail is fixed with the bottom plate by bolts and is arranged above the bottom plate, a plurality of groups of samples are installed on the slide rail to carry out multifactor aging tests, and the vibration exciting component is fixedly connected with the bottom plate by a linkage rod and is used for driving the bottom plate to conduct the plurality of groups of samples to vibrate.
3. The solid insulation material multifactor aging test device of claim 2, wherein the test platform further comprises sample clamps and slide blocks, the slide blocks are arranged on the slide rails in pairs in a group, the sample clamps correspond to the slide blocks in a one-to-one manner and are vertically arranged above the slide blocks, two ends of the sample are respectively fixed on the two sample clamps in the same group, the spacing distance between each group of slide blocks is more than or equal to 1/4L, the spacing distance between each slide block and the inner wall of the constant temperature aging box is more than or equal to 5/4L, wherein L is the length of the sample;
electrodes are respectively arranged at two ends of the sample, the electrodes at two ends of the same sample form electrode groups, two electrodes of each electrode group are respectively connected with the positive end and the negative end of the power supply assembly, and the electrode groups and the power supply assembly which are connected in parallel.
4. The solid insulation material multifactor aging test apparatus according to claim 3, wherein the sample holder is a push-pull force holder, the push-pull force holder is connected with the tension sensor, and the size of the opening of the push-pull force holder is less than or equal to 3mm.
5. The multifactor aging test apparatus for solid insulating materials of claim 3, wherein the base plate is made of insulating material, and the slide rail, the sample holder and the slider are made of insulating metal material.
6. The multifactor aging test apparatus for solid insulation of claim 2, wherein the vibration exciter assembly comprises a vibration exciter, a power amplifier and a signal generator, which are connected in sequence, and an acceleration sensor connected to the base plate, the signal generator and the power amplifier set the output frequency and intensity for the vibration exciter, the vibration exciter is connected to the linkage rod, the acceleration sensor senses the vibration signal of the base plate and feeds the vibration signal back to the signal generator, and the frequency and intensity of the vibration exciting signal from the signal generator are adjusted.
7. A multifactor aging test method of a solid insulation material, characterized by using the multifactor aging test apparatus of a solid insulation material according to any one of claims 1 to 5, comprising the steps of:
placing a plurality of groups of samples needing to be subjected to an aging test on a test platform;
exerting a preset tension on the sample, and fixing the sample on a test platform;
setting the frequency and voltage output by the power supply assembly according to the aging test parameters;
setting output frequency and intensity through the excitation assembly, and adjusting the output frequency and intensity through the vibration frequency feedback of the real-time monitoring test platform;
after the frequency and the voltage output by the power supply assembly and the output frequency and the strength of the excitation assembly are stable and have no discharge phenomenon, the constant-temperature aging box is heated to a preset temperature;
and after the preset time is reached, taking out the sample, and finishing the aging test.
8. The solid insulation material multifactor aging test method according to claim 7, wherein the test platform further comprises sample clamps and slide blocks, the slide blocks are arranged on the slide rails in groups, the sample clamps correspond to the slide blocks one by one and are vertically arranged above the slide blocks, and two ends of the sample are respectively fixed on the two sample clamps in the same group;
exert predetermined pulling force to the sample to be fixed in test platform, specifically include:
marking the two sliders in the same group as a first slider and a second slider respectively;
the first sliding block is locked with the test platform, and the second sliding block is connected with the tension sensor;
pulling the tension sensor to drive the second sliding block to move, wherein the tension of the tension sensor reaches a preset value, and the second sliding block is locked with the test platform.
9. The multifactor aging test method for solid insulation materials of claim 8, wherein the excitation assembly comprises an exciter, a power amplifier and a signal generator which are connected in sequence, and an acceleration sensor connected with the test platform, wherein the acceleration sensor comprises a sensitive core and a piezoelectric assembly.
10. The solid insulation material multifactor aging test method of claim 9, wherein the output frequency and intensity are adjusted by monitoring the vibration frequency feedback of the test platform in real time, specifically comprising the steps of:
the sensitive core body collects the vibration acceleration of the test platform in the aging test process, gives out mechanical signal data through analysis and transmits the mechanical signal data to the piezoelectric assembly;
the piezoelectric component is acted by a mechanical signal, charge signal data are formed on the surface of the piezoelectric component, the charge signal data are transmitted to the signal generator, and the relationship between the charge signal and the mechanical signal is as follows:
u is a voltage signal output by the piezoelectric component, dz is a piezoelectric coefficient of the piezoelectric component in a 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 to be detected, gamma is the relative dielectric constant of the piezoelectric component, beta is the vacuum dielectric constant, and S is the surface area of the upper surface of the piezoelectric component;
the signal generator outputs a variable frequency current for adjusting the electrodynamic force of the vibration exciter with the power amplifier based on the analysis of the charge signal;
the vibration exciter outputs electric power to the test platform in real time based on the numerical value of the variable frequency current, and provides the vibration acceleration of the test platform;
the vibration exciter outputs electrodynamic force to the test platform in real time based on the value of variable frequency current to give the vibration acceleration of the test platform, and the specific relation is as follows:
wherein, λ is the dynamic constant of the vibration exciter, I is the variable frequency current output to the vibration exciter by the signal generator and the power amplifier, g is the vibration acceleration of the test platform, c i When the output electric power of the exciter is in the ith period of input variable frequency current and i is odd number, c i If 1,i is an even number, c i =1,k is the modulus of elasticity, x, of the elastic component i The displacement of the elastic element in the ith period.
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| CN117029907A (en) * | 2023-07-11 | 2023-11-10 | 连云港石港高压电瓷有限公司 | High-voltage porcelain insulation detection device and application method thereof |
| CN117029907B (en) * | 2023-07-11 | 2024-01-23 | 连云港石港高压电瓷有限公司 | High-voltage porcelain insulation detection device and application method thereof |
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