A method and system for measuring mechanical cumulative properties of an insulation

Abstract

The application discloses a kind of insulating piece mechanical cumulative characteristic measurement method and system, method includes according to preset test scheme, by matching compression test device and tensile experimental device, current insulating piece in current test group is carried out pressure load test, until satisfying the requirement of impact number in preset test scheme, the permanent deformation of current insulating piece is measured, then current insulating piece is carried out compression strength test, obtains the compression strength value of current insulating piece;Wherein, the test number of pressure load test is consistent with the impact number in preset test scheme;Statistical analysis permanent deformation and compression strength value of all insulating pieces in preset test scheme, a plurality of test groups, obtain the mechanical cumulative characteristic result of insulating piece.This embodiment realizes the cumulative characteristic of effectively measuring the mechanical performance of insulating piece, quantifies the mechanical performance of insulating piece compression, improves the accuracy of measurement.

Description

Technical Field

[0001] This invention relates to the field of material mechanical property measurement, and in particular to a method and system for measuring the cumulative mechanical properties of insulating components. Background Technology

[0002] In practical applications, insulation components are subject to cyclic loads or multiple impact loads. For example, insulation pads in transformers are subjected to repeated electromagnetic force impacts during multiple short circuits. Power grids contain areas prone to short circuits, or short circuits may recur due to repeated reclosing of the system. Transformers in the network therefore face the risk of enduring multiple short circuits. During a short circuit, the current may increase to more than ten times that under normal operating conditions, and the axial electromagnetic force generated by the conductors in the windings under the influence of the electromagnetic field can reach over 1000kN. Under such enormous electromagnetic forces, the insulation components / insulation pads between the conductors may undergo irreversible minute changes. After multiple short circuits, these irreversible changes accumulate, and once they reach a certain level, the mechanical properties of the insulation components / insulation pads deteriorate, thus affecting the transformer performance.

[0003] Based on several understandings and studies of the national standards for the short-circuit withstand capability of existing power transformers, it is proposed that the axial cumulative effect instability mode of the winding differs from that of the amplitude instability mode. Axial instability is mostly caused by the small, irreversible deformation and displacement of components such as coils and pads. Therefore, it is necessary to measure and compare the deformation and cumulative mechanical properties of insulation components after cyclic loading or multiple impact loading, so as to provide a basis for the selection of components in related processes. Summary of the Invention

[0004] This invention provides a method and system for measuring the cumulative mechanical properties of insulating components, enabling effective measurement of the cumulative mechanical properties of insulating components, quantifying the compressive mechanical properties of insulating components, and improving the accuracy of the measurement.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a method for measuring the mechanical cumulative characteristics of insulating components, comprising:

[0006] According to the preset test plan, the current insulating component in the current test group is subjected to a pressure load test using a matching compression test device and a tensile test device until the number of impacts required in the preset test plan is met. The permanent deformation of the current insulating component is measured, and then the current insulating component is subjected to a compressive strength test to obtain the compressive strength value of the current insulating component. The number of pressure load tests is consistent with the number of impacts in the preset test plan.

[0007] Statistical analysis was performed on the permanent deformation and compressive strength values ​​of all insulating components in the pre-designed test scheme and several test groups to obtain the results of the cumulative mechanical characteristics of the insulating components.

[0008] According to the embodiments of the present invention, based on a preset test plan, a pressure load test is conducted on the current insulating component in the current test group using a matching compression test device and a tensile test device until the required number of impacts in the preset test plan is met. The permanent deformation of the current insulating component is measured, and then the current insulating component is subjected to a compressive strength test to obtain the compressive strength value of the current insulating component. The number of pressure load tests is consistent with the number of impacts in the preset test plan. The permanent deformation and compressive strength values ​​of all insulating components in the preset test plan and several test groups are statistically analyzed to obtain the cumulative mechanical characteristics of the insulating component. By conducting pressure load tests and compressive strength tests according to the preset test plan, the permanent deformation and compressive strength values ​​of the insulating component are obtained. The cumulative mechanical properties of the insulating component after being subjected to multiple large pressures are measured, and the cumulative mechanical properties are obtained through statistical analysis. This effectively measures the cumulative mechanical properties of the insulating component, providing a basis for the selection of insulating components in practical applications, quantifying the compressive mechanical properties of the insulating component, and improving the accuracy of measuring the mechanical properties of the insulating component.

[0009] As a preferred option, the pre-set test plan is as follows:

[0010] Based on the cumulative test requirements, test groups with different impact cycles are set up to conduct pressure load tests on the insulating components; the cumulative test requirements include the deformation, mechanical properties and pressure load of the insulating components.

[0011] As a preferred option, a pressure load test is conducted on the current insulating component in the current test group using a matching compression testing device and a tensile testing device, specifically as follows:

[0012] Fix the current insulating component in the current test group into the matching compression test device, and fix the matching compression test device into the tensile test device. Adjust the tensile test device to the preset clamping position, start the tensile test device, and apply the preset pressure load.

[0013] As a preferred option, a preset pressure load is applied, specifically by setting the magnitude and duration of the pressure load in the preset test scheme according to the actual working conditions.

[0014] As a preferred method, the permanent deformation of the current insulation component is measured, specifically:

[0015] Measure the current dimensions of the insulating component after unloading the preset pressure load to obtain the unloaded dimensions of the current insulating component;

[0016] Calculate the permanent deformation of the current insulation component based on the current unloading dimensions and original dimensions.

[0017] The original dimension data refers to the dimensions of the current insulating component measured before the current insulating component undergoes a pressure load test.

[0018] As a preferred option, the current insulating component is subjected to a compressive strength test to obtain its compressive strength value, specifically:

[0019] After fixing the current insulating component, the load is increased uniformly to obtain a force-displacement curve.

[0020] Based on the current cracking condition of the insulation component and the force-displacement curve, the compressive strength value of the current insulation component is obtained.

[0021] Optionally, statistical analysis is performed on the permanent deformation and compressive strength values ​​of all insulating components in the pre-set test scheme and several test groups to obtain the results of the cumulative mechanical characteristics of the insulating components, specifically:

[0022] After removing outlier data from the compressive strength values ​​of each insulating component in the same test group, the average compressive strength value of the same test group is obtained by taking the average value.

[0023] By comparing the average compressive strength values ​​of different test groups, the variation patterns between compressive strength and the number of impacts, and between compressive strength and pressure load, were analyzed.

[0024] After removing outlier data from the permanent deformation of each insulating component in the same test group, the average permanent deformation of the same test group is obtained by taking the average value.

[0025] By comparing the average permanent deformation of different test groups, the variation patterns between permanent deformation and the number of impacts, and between permanent deformation and pressure load, were analyzed.

[0026] To address the same technical problem, embodiments of the present invention also provide a system for measuring the mechanical cumulative characteristics of insulating components, comprising: a matching compression testing device, a tensile testing device, and a control module; wherein the control module executes a method for measuring the mechanical cumulative characteristics of insulating components.

[0027] The equipment is connected as follows: the compression testing device is connected to the tensile testing device, the compression testing device is connected to the control module, and the tensile testing device is connected to the control module.

[0028] Optionally, the control module includes an experimental unit and an analysis unit;

[0029] The test unit is used to conduct a pressure load test on the current insulating component in the current test group according to the preset test plan, using a matching compression test device and a tensile test device, until the impact number requirement in the preset test plan is met, measure the permanent deformation of the current insulating component, and then conduct a compressive strength test on the current insulating component to obtain the compressive strength value of the current insulating component; wherein, the number of pressure load tests is consistent with the number of impacts in the preset test plan;

[0030] The analysis unit is used to statistically analyze the permanent deformation and compressive strength values ​​of all insulating components in the preset test scheme and several test groups, and obtain the results of the cumulative mechanical characteristics of the insulating components.

[0031] Optionally, the tensile testing apparatus is used to apply pressure to the insulation;

[0032] The matching compression testing device is used to fix the insulating parts, and the configuration is selected according to the shape characteristics of the insulating parts. Attached Figure Description

[0033] Figure 1 : A schematic flowchart of an embodiment of a method for measuring the mechanical cumulative characteristics of an insulating component provided by the present invention;

[0034] Figure 2 : Measurement test diagram of an embodiment of the method for measuring the mechanical cumulative characteristics of insulating components provided by the present invention;

[0035] Figure 3 : A connection diagram of an embodiment of the mechanical cumulative characteristic measurement system for insulating components provided by the present invention. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Please refer to Figure 1 This is a flowchart illustrating a method for measuring the cumulative mechanical properties of an insulating component according to an embodiment of the present invention. The measurement method of this embodiment is applicable to measuring and comparing the cumulative mechanical properties of insulating components. This embodiment improves the accuracy of the measurement by quantifying the compressive strength of the insulating component. The measurement method includes steps 101 to 102, each step being as follows:

[0039] Step 101: According to the preset test plan, the current insulating component in the current test group is subjected to a pressure load test using the matching compression test device and tensile test device until the number of impacts required in the preset test plan is met. The permanent deformation of the current insulating component is measured, and then the current insulating component is subjected to a compressive strength test to obtain the compressive strength value of the current insulating component. The number of pressure load tests is consistent with the number of impacts in the preset test plan.

[0040] Optionally, a preset test scheme is provided, specifically: according to the cumulative test requirements, test groups are set up under different impact numbers to conduct pressure load tests on the insulating components; wherein, the cumulative test requirements include the deformation, mechanical properties and pressure load of the insulating components.

[0041] In this embodiment, before conducting the actual measurement, pre-test preparations can be made, including instrument debugging, insulation component size measurement, and setting up a test control group for the test insulation component. When pre-setting the test plan, based on the cumulative test requirements, namely insulation component deformation, mechanical properties, and pressure load, a comparative test group can be designed to compare the insulation component deformation and mechanical properties under different impact numbers. Control test groups can be set up according to different impact numbers, such as impact numbers 1, 2, 4, 8, 12, 16, 20, 24, etc.

[0042] Optionally, the current insulating component in the current test group can be subjected to a pressure load test using a matching compression test device and a tensile test device. Specifically, the current insulating component in the current test group is fixed in the matching compression test device and the matching compression test device is fixed in the tensile test device. The tensile test device is adjusted to a preset clamping position, the tensile test device is started, and a preset pressure load is applied.

[0043] In this embodiment, the insulating component is fixed in the matching compression testing device, and the matching compression testing device is fixed in the lower chuck of the tensile testing machine in the tensile testing device. After adjusting the upper chuck of the testing machine to a suitable clamping position, the tensile testing machine is started according to the requirements of the current test group in the preset test plan, and the corresponding pressure load is applied.

[0044] Optionally, a preset pressure load can be applied, specifically by setting the magnitude and duration of the pressure load in the preset test scheme according to the actual working conditions.

[0045] In this embodiment, the magnitude and duration of the preset pressure load applied in the experimental scheme can be set according to the actual working conditions of the insulating component. Measurement tests, such as... Figure 2 As shown, after the pressure load is applied, the force is released, the number of impacts is incremented by 1, the test piece (current insulating component) is removed, the dimensions of the test piece after unloading the pressure load are measured, the permanent deformation of the test piece is calculated, and the current test data is saved. It is then determined whether the number of tests (number of impacts) meets the requirements. If not, the test continues using the matching compression testing device and tensile testing device to perform pressure load tests on the current insulating component in the current test group until the number of impacts required in the preset test plan is met.

[0046] Optionally, the permanent deformation of the current insulating component can be measured, specifically by: measuring the dimensions of the current insulating component after unloading the preset pressure load to obtain the unloaded dimensions of the current insulating component; based on the unloaded dimensions of the current insulating component and the original dimension data; wherein, the original dimension data is the dimensions of the current insulating component measured before the pressure load test.

[0047] In this embodiment, when measuring the original dimensional data before the pressure load test, if the test piece has a small dimension in the compression direction, such as a pad, multiple test pieces of the same size can be bundled together, and the dimensions and deformation are measured by averaging. The permanent deformation of the test piece (current insulation component) is calculated, which is the dimension before the test (original dimensional data) minus the dimension after unloading.

[0048] Optionally, a compressive strength test is performed on the current insulating component to obtain its compressive strength value. Specifically, after fixing the current insulating component, the load is increased uniformly to obtain a force-displacement curve. Based on the cracking condition of the current insulating component and the force-displacement curve, the compressive strength value of the current insulating component is obtained.

[0049] In this embodiment, if the required number of impacts is reached, a compressive strength test is performed on the test piece (current insulating component). After fixing, the insulating component is fixed in the matching compression testing device, and the matching compression testing device is fixed in the lower clamp of the tensile testing machine in the tensile testing device. After adjusting the upper clamp of the testing machine to a suitable clamping position, the load is slowly and evenly increased. The force-displacement curve is compared. The compressive load value at which the force-displacement curve drops sharply or the test piece cracks is obtained as the compressive strength value of the test piece (current insulating component). After obtaining the compressive strength value of the test piece (current insulating component), as follows... Figure 2 As shown, determine if there are any untested test pieces in the test group. If so, replace the insulating parts, measure the dimensions of the insulating parts, and return to continue the pressure load test on the new insulating parts until the number of impacts required in the preset test plan is met. Determine if there are any untested test groups. If so, replace the test group, replace the insulating parts, measure the dimensions of the insulating parts, and return to continue the pressure load test on the new insulating parts until the number of impacts required in the preset test plan is met.

[0050] It should be noted that the compressive strength test is a destructive test. If it is necessary to measure other mechanical properties of the test piece after multiple impacts, it should be done before the compressive strength test.

[0051] Step 102: Statistically analyze the permanent deformation and compressive strength values ​​of all insulating components in the preset test scheme and several test groups to obtain the results of the cumulative mechanical characteristics of the insulating components.

[0052] Optionally, step 102 specifically involves: removing outlier data from the compressive strength values ​​of each insulating component in the same test group and taking the average value to obtain the average compressive strength value of the same test group; comparing the average compressive strength values ​​of different test groups to analyze the variation patterns between compressive strength and the number of impacts, and between compressive strength and pressure load; removing outlier data from the permanent deformation of each insulating component in the same test group and taking the average value to obtain the average permanent deformation of the same test group; comparing the average permanent deformation of different test groups to analyze the variation patterns between permanent deformation and the number of impacts, and between permanent deformation and pressure load.

[0053] In this embodiment, after the pressure load test and compressive strength test are completed, the test results are statistically analyzed. For the same test group (same number of impacts and impact load), after removing outlier data, the average compressive strength value of the insulating component is taken. The average compressive strength of the test pieces from different test groups is compared, and the variation law of the average compressive strength with the number of impacts and impact load is analyzed, that is, the variation law between compressive strength and the number of impacts, and between compressive strength and pressure load. For the same test group (same number of impacts and impact load), after removing outlier data, the average permanent deformation of the insulating component is taken. The average permanent deformation of the test pieces from different test groups is compared, and the variation law of the average permanent deformation with the number of impacts and impact load is analyzed, that is, the variation law between permanent deformation and the number of impacts, and between permanent deformation and pressure load.

[0054] According to the embodiments of the present invention, based on a preset test plan, a pressure load test is conducted on the current insulating component in the current test group using a matching compression test device and a tensile test device until the required number of impacts in the preset test plan is met. The permanent deformation of the current insulating component is measured, and then the current insulating component is subjected to a compressive strength test to obtain the compressive strength value of the current insulating component. The number of pressure load tests is consistent with the number of impacts in the preset test plan. The permanent deformation and compressive strength values ​​of all insulating components in the preset test plan and several test groups are statistically analyzed to obtain the cumulative mechanical characteristics of the insulating component. By conducting pressure load tests and compressive strength tests according to the preset test plan, the permanent deformation and compressive strength values ​​of the insulating component are obtained. The cumulative mechanical properties of the insulating component after being subjected to multiple large pressures are measured, and the cumulative mechanical properties are obtained through statistical analysis. This effectively measures the cumulative mechanical properties of the insulating component, providing a basis for the selection of insulating components in practical applications, quantifying the compressive mechanical properties of the insulating component, and improving the accuracy of measuring the mechanical properties of the insulating component.

[0055] Example 2

[0056] Accordingly, see Figure 3 , Figure 3 This is a connection diagram of Embodiment 2 of the mechanical cumulative characteristic measurement system for insulating components provided by the present invention. Figure 3As shown, the mechanical cumulative characteristic measurement system for insulating components includes a matching compression testing device 301, a tensile testing device 302, and a control module 303; wherein, the control module 303 executes the mechanical cumulative characteristic measurement method for insulating components.

[0057] The equipment is connected as follows: the compression testing device 301 is connected to the tensile testing device 302, the compression testing device 301 is connected to the control module 303, and the tensile testing device 302 is connected to the control module 303.

[0058] The control module 303 includes a test unit 3031 and an analysis unit 3032;

[0059] Test unit 3031 is used to conduct a pressure load test on the current insulating component in the current test group according to a preset test plan, using a matching compression test device and a tensile test device, until the number of impacts required in the preset test plan is met, measure the permanent deformation of the current insulating component, and then conduct a compressive strength test on the current insulating component to obtain the compressive strength value of the current insulating component; wherein, the number of pressure load tests is consistent with the number of impacts in the preset test plan;

[0060] Optionally, a preset test scheme is provided, specifically: according to the cumulative test requirements, test groups are set up under different impact numbers to conduct pressure load tests on the insulating components; wherein, the cumulative test requirements include the deformation, mechanical properties and pressure load of the insulating components.

[0061] Optionally, the current insulating component in the current test group can be subjected to a pressure load test using a matching compression test device and a tensile test device. Specifically, the current insulating component in the current test group is fixed in the matching compression test device and the matching compression test device is fixed in the tensile test device. The tensile test device is adjusted to a preset clamping position, the tensile test device is started, and a preset pressure load is applied.

[0062] Optionally, a preset pressure load can be applied, specifically by setting the magnitude and duration of the pressure load in the preset test scheme according to the actual working conditions.

[0063] Optionally, the permanent deformation of the current insulating component is measured, specifically: the dimensions of the current insulating component after unloading the preset pressure load are measured to obtain the unloaded dimensions of the current insulating component; the permanent deformation of the current insulating component is calculated based on the unloaded dimensions and the original dimension data; wherein, the original dimension data is the dimensions of the current insulating component measured before the pressure load test is conducted.

[0064] Optionally, a compressive strength test is performed on the current insulating component to obtain its compressive strength value. Specifically, after fixing the current insulating component, the load is increased uniformly to obtain a force-displacement curve. Based on the cracking condition of the current insulating component and the force-displacement curve, the compressive strength value of the current insulating component is obtained.

[0065] The analysis unit 3032 is used to statistically analyze the permanent deformation and compressive strength values ​​of all insulating components in the preset test scheme and several test groups to obtain the results of the cumulative mechanical characteristics of the insulating components.

[0066] Optionally, statistical analysis can be performed on the permanent deformation and compressive strength values ​​of all insulating components in the pre-set test scheme and several test groups to obtain the results of the cumulative mechanical characteristics of the insulating components. Specifically, after removing outliers from the compressive strength values ​​of each insulating component in the same test group, the average compressive strength value of the same test group is obtained; the average compressive strength values ​​of different test groups are compared to analyze the variation law between compressive strength and the number of impacts, and between compressive strength and pressure load; after removing outliers from the permanent deformation of each insulating component in the same test group, the average permanent deformation value of the same test group is obtained; the average permanent deformation values ​​of different test groups are compared to analyze the variation law between permanent deformation and the number of impacts, and between permanent deformation and pressure load.

[0067] The matching compression test device 301 is used to fix the insulating parts, and the configuration is selected according to the shape characteristics of the insulating parts.

[0068] In this embodiment, the supporting compression testing device includes, but is not limited to, a fixed base, a fixed wedge, and a movable wedge, used to fix the test piece, i.e., to fix the insulating component, and is selected or customized according to the shape characteristics of the test piece.

[0069] The tensile testing apparatus 302 is used to apply pressure to the insulating component.

[0070] In this embodiment, the supporting compression testing device includes, but is not limited to, a tensile testing machine, a hydraulic station, an electrical control box, a computer (control software), etc., used to apply pressure to the test piece (insulating part). It can be replaced by other devices that can control and support the compression testing device to apply pressure.

[0071] By implementing embodiments of the present invention, a test layout for measuring the cumulative mechanical properties of insulating components is proposed. This layout is used to measure the cumulative mechanical properties of insulating components after they have been subjected to enormous pressure multiple times, providing a basis for the selection of insulating components in practical applications.

[0072] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A method of measuring the mechanical cumulative properties of an insulation part, characterized in that, The application relates to a method for testing mechanical cumulative characteristics of insulating pieces. According to a preset test scheme, a current insulating piece in a current test group is subjected to a pressure load test through a matched compression test device and a tensile test device until the requirement of impact times in the preset test scheme is met, the permanent deformation of the current insulating piece is measured, the current insulating piece is subjected to a compression strength test, and the compression strength value of the current insulating piece is obtained; wherein the test times of the pressure load test are consistent with the impact times in the preset test scheme; Statistical analysis is performed on the permanent deformation and the compression strength value of all insulating pieces in the preset test scheme and a plurality of test groups, and the mechanical cumulative characteristic result of the insulating pieces is obtained; The current insulating piece in the current test group is fixed in the matched compression test device, and the matched compression test device is fixed in the tensile test device, the tensile test device is adjusted to a preset clamping position, the tensile test device is started, and a preset pressure load is applied; The preset test scheme is specifically as follows: According to cumulative test requirements, test groups under different impact times are set, and the insulating pieces are subjected to the pressure load test; wherein the cumulative test requirements include deformation of the insulating pieces, mechanical properties and pressure load; The preset pressure load is specifically set according to actual working conditions in terms of size and time; The permanent deformation of the current insulating piece is measured by measuring the size of the current insulating piece after the preset pressure load is unloaded, and obtaining the unloading size of the current insulating piece; According to the unloading size and original size data of the current insulating piece, the permanent deformation of the current insulating piece is calculated; The original size data is the size of the current insulating piece measured before the pressure load test. The current insulating piece is fixed, a load is uniformly increased, and a force-displacement curve is obtained; According to the cracking condition of the current insulating piece and the force-displacement curve, the compression strength value of the current insulating piece is obtained.

2. The method of claim 1, wherein, The statistical analysis of the permanent deformation and the compression strength value of all insulating pieces in the preset test scheme and a plurality of test groups is specifically as follows: The average compression strength value of the same test group is obtained by removing abnormal data from the compression strength value of each insulating piece in the same test group; The change law between the compression strength and the impact times, and the change law between the compression strength and the pressure load are analyzed by comparing the average compression strength values of different test groups; 3. The method of measuring the mechanical cumulative properties of an insulation part according to claim 1 or 2, characterized in that, The average permanent deformation of the same test group is obtained by removing abnormal data from the permanent deformation of each insulating piece in the same test group; The change law between the permanent deformation and the impact times, and the change law between the permanent deformation and the pressure load are analyzed by comparing the average permanent deformation of different test groups. The application relates to a method for testing mechanical cumulative characteristics of insulating pieces. ​ ​ 4. An insulation part mechanical accumulation property measuring system characterized by comprising: ​ The compression test device, the tensile test device and the control module are matched; the control module executes the insulation mechanical cumulative characteristic measurement method according to any one of claims 1 to 3; The connection of the device is as follows: the compression test device is connected with the tensile test device, the compression test device is connected with the control module, and the tensile test device is connected with the control module.

5. The insulator mechanical cumulative property measuring system of claim 4 wherein, The control module comprises a test unit and an analysis unit; The test unit is used for performing a pressure load test on the current insulation in the current test group by the matched compression test device and the tensile test device according to a preset test scheme until the impact number requirement in the preset test scheme is met, measuring the permanent deformation of the current insulation, and then performing a compression strength test on the current insulation to obtain the compression strength value of the current insulation; the test number of the pressure load test is consistent with the impact number in the preset test scheme; The analysis unit is used for statistically analyzing the permanent deformation and the compression strength value of all insulations in the preset test scheme and a plurality of test groups to obtain the insulation mechanical cumulative characteristic result.

6. The mechanical cumulative property measurement system of insulation parts as claimed in claim 4, wherein, The tensile test device is used for applying pressure to the insulation; The matched compression test device is used for fixing the insulation and is configured according to the shape characteristics of the insulation.

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