Multi-channel dielectric material displacement-electric field ferroelectric hysteresis loop testing device and testing method thereof

Abstract

The invention provides a multichannel dielectric material displacement-electric field ferroelectric hysteresis loop testing device and a testing method thereof, and belongs to an insulating material measurement technology and a dielectric energy storage technology. The problems that a traditional electric displacement-electric field ferroelectric hysteresis loop testing device is low in testing efficiency, complex in operation and incapable of achieving consistency of a testing point position and a thickness measuring point position are solved. The test bench comprises a high-voltage breakdown test unit and a ferroelectric hysteresis loop test unit, the signal output ends of the high-voltage breakdown test unit and the ferroelectric hysteresis loop test unit are connected with a computer, an upper electrode integrated board is installed on the side face of a test bench base through a sliding rail, and an electrostatic capacitance type linear encoder is connected with the computer. The upper end of the high-voltage pole column is connected with the high-voltage breakdown test unit, the lower pole plate is arranged on the test bed base, the low-voltage pole column is connected with the lower pole plate, the low-voltage pole column is connected with the high-voltage breakdown test unit, and the test bed base is immersed in silicone oil of an oil bath pan. The device is mainly used for insulating material measurement.

Description

Technical Field

[0001] The present invention belongs to the field of insulating material measurement technology and dielectric energy storage technology, and in particular relates to a multi-channel dielectric material displacement-electric field hysteresis loop testing device and a testing method thereof. Background Art

[0002] High-voltage breakdown strength testing technology is a key means of evaluating the electrical properties of insulating materials. It is widely used in power equipment, electronic components, aerospace and other fields. The high-voltage breakdown strength testing device is a key device for measuring the breakdown voltage of insulating materials by simulating extreme electric field conditions. Its core principle is based on a closed-loop system of high-voltage application-breakdown detection-data analysis, involving the cross-application of electrical engineering, materials science and precision measurement technology.

[0003] The high-voltage breakdown strength test device applies a controllable electric field to the insulating material through a high-voltage generator, uses symmetrical electrodes to ensure the uniformity of the electric field, detects the breakdown moment through the current mutation signal, combines with the environmental control unit to simulate the actual working conditions, and finally calculates the breakdown field strength.

[0004] Hysteresis loop testing technology is a core means to characterize the polarization properties of ferroelectric and dielectric materials. It originated from the research on ferroelectrics such as barium titanate in the 1940s. This technology reveals the ferroelectricity, dielectric loss and energy storage characteristics of the material by measuring the polarization intensity-electric field intensity hysteresis loop of the material under an alternating electric field.

[0005] The current high-voltage breakdown strength and hysteresis loop tests can only meet the test requirements of a single sample at the same time. For a large number of samples, they can only be tested one by one, which takes a lot of time. At the same time, in the current testing method, the thickness is first manually measured using a thickness gauge, and then the test is performed. Due to some uncontrollable factors in the sample preparation process, it is inevitable that the thickness of the prepared sample will not be completely uniform. Therefore, after the thickness is manually measured, when the sample is laid out for testing, the actual test position is not the position where the thickness is manually measured, which will cause a large calculation error and the test result is not accurate enough. Summary of the Invention

[0006] In view of this, the present invention aims to propose a multi-channel dielectric material displacement-electric field hysteresis loop testing device and a testing method thereof, so as to solve the problems of low testing efficiency, complex operation and inability to achieve consistency between test points and thickness measurement points in traditional electric displacement-electric field hysteresis loop testing devices.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A multi-channel dielectric material displacement-electric field hysteresis loop test device includes an oil bath, a computer, a test system, and a test bench. The test system includes a high-voltage breakdown test unit and a hysteresis loop test unit. The high-voltage breakdown test unit and the hysteresis loop test unit are connected via a data line b. The signal output ends of the high-voltage breakdown test unit and the hysteresis loop test unit are connected to the computer via a data line c. The test bench includes a test bench base, an upper electrode integrated board, an electrostatic capacitive linear encoder, a high-voltage pole, a lower plate, and a low-voltage pole. The upper electrode integrated board connects 16 high-voltage poles. Integrated on the insulating board, the upper electrode integrated board is installed on the side of the test bench base through a slide rail, the electrostatic capacitive linear encoder is provided with 16, 16 electrostatic capacitive linear encoders are installed on the upper electrode integrated board and are respectively nested on the high-voltage pole pole, the electrostatic capacitive linear encoder is connected to the computer through a data line a, the upper end of the high-voltage pole pole is connected to the high-voltage breakdown test unit through a wire a, the lower plate is placed on the test bench base, the low-voltage pole pole is connected to the lower plate, the low-voltage pole pole is connected to the high-voltage breakdown test unit through a wire b, and the test bench base is immersed in silicone oil in an oil bath.

[0009] Furthermore, a spring is embedded in the outer side of the high-voltage pole, and the spring is fixed by a cross bar provided in the middle of the high-voltage pole.

[0010] Furthermore, the test bench base is made of thermally conductive ceramics.

[0011] Furthermore, the upper electrode integrated board is made of acrylic board or epoxy resin.

[0012] Furthermore, the size of the upper electrode integrated board is 20*20 cm, and the front, back, left and right spacing of the high-voltage poles is 4 cm.

[0013] Furthermore, the high-voltage pole is made of steel and has a hemispherical lower end.

[0014] Furthermore, the lower electrode plate is lower than the silicone oil level in the oil bath.

[0015] A testing method for a multi-channel dielectric material displacement-electric field hysteresis loop testing device includes a high voltage breakdown strength testing method and a hysteresis loop testing method.

[0016] Furthermore, the high voltage breakdown strength testing method comprises the following steps:

[0017] Step 1: Lift the upper electrode integrated board, place the sample to be tested on top of the lower electrode board and below the high-voltage pole, then lower the upper electrode integrated board so that the high-voltage pole is pressed on the sample to be tested;

[0018] Step 2: During the test, select the high-voltage pole corresponding to the test point, select the boost mode, select gradient boost or linear boost, select the boost step size in gradient boost mode, select the boost rate in linear boost mode, and then select the boost voltage waveform;

[0019] Step 3: The thickness data of the sample to be tested is transmitted to the computer through the data line by the electrostatic capacitive linear encoder, and the data is stored;

[0020] Step 4: Click Start Measurement on the computer, and then turn on the power of the high voltage breakdown test unit;

[0021] Step 5: The high voltage breakdown test unit is energized in sequence according to the selected high voltage pole pole sequence, and the next test point begins when the previous test point breaks down.

[0022] Furthermore, in the hysteresis loop testing method, the low voltage pole is connected to the hysteresis loop testing unit via the wire b, comprising the following steps:

[0023] Step 1: Lift the upper electrode integrated board, place the sample to be tested on top of the lower electrode board and below the high-voltage pole, then lower the upper electrode integrated board so that the high-voltage pole is pressed on the sample to be tested;

[0024] Step 2: During the test, select the high-voltage pole corresponding to the test point, select gradient boost, in gradient boost mode, select the boost step size, and then select the boost voltage waveform;

[0025] Step 3: The thickness data of the sample to be tested is transmitted to the computer through the data line by the electrostatic capacitive linear encoder, and the data is stored;

[0026] Step 4: Turn on the power of the hysteresis loop test unit, enter the area of the sample to be tested on the computer, select the charge capacity per charge, and then click Start Measurement;

[0027] Step 5: The hysteresis loop test unit is energized in sequence according to the selected high-voltage pole pole sequence, and the next test point is started when the previous test point breaks down.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention adopts an array and integrated thickness measurement test bench design, which enables multiple samples to be tested simultaneously, greatly improving the test efficiency and measurement accuracy. At the same time, in high-temperature tests, since the test bench base is made of high thermal conductivity ceramic material, it can not only quickly raise the lower plate to the target temperature and maintain good temperature stability, but also serve as an insulator between the lower plate and the oil bath.

[0030] 2. The present invention realizes the integration of measurement and feedback, and can modify the test conditions according to different test requirements and flexibly adjust them to meet the requirements of high-voltage breakdown strength tests of all insulating materials and hysteresis loop tests of dielectric energy storage materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 Schematic diagram of a multi-channel dielectric material displacement-electric field hysteresis loop testing device according to the present invention;

[0033] Figure 2 The structure of the test bench of the present invention is shown as follows Figure 1 ;

[0034] Figure 3 The structure of the test bench of the present invention is shown as follows Figure 2 ;

[0035] In the picture:

[0036] 1-test bench base, 2-upper electrode integrated board, 3-electrostatic capacitive linear encoder, 4-high voltage pole, 5-lower plate, 6-low voltage pole, 7-spring, 8-oil bath, 9-computer, 10-test system, 11-test bench, 12-high voltage breakdown test unit, 13-hysteresis loop test unit, 14-data line a, 15-wire a, 16-wire b, 17-data line b, 18-data line c. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0038] Specific implementation 1: See Figure 1-3Describe this embodiment, a multi-channel dielectric material displacement-electric field hysteresis loop test device, including an oil bath pot 8, a computer 9, a test system 10 and a test bench 11, the test system 10 includes a high-voltage breakdown test unit 12 and a hysteresis loop test unit 13, the high-voltage breakdown test unit 12 and the hysteresis loop test unit 13 are connected via a data line b17, the signal output ends of the high-voltage breakdown test unit 12 and the hysteresis loop test unit 13 are connected to the computer 9 via a data line c18, the test bench 11 includes a test bench base 1, an upper electrode integrated board 2, an electrostatic capacitive linear encoder 3, a high-voltage pole 4, a lower plate 5 and a low-voltage pole 6, the upper electrode integrated board 2 will 16 high-voltage poles 4 are integrated on the insulating board, the upper electrode integrated board 2 is installed on the side of the test bench base 1 through a slide rail, 16 electrostatic capacitive linear encoders 3 are provided, 16 electrostatic capacitive linear encoders 3 are installed on the upper electrode integrated board 2 and are respectively nested on the high-voltage pole 4, the electrostatic capacitive linear encoder 3 is connected to the computer 9 through the data line a14, the upper end of the high-voltage pole 4 is connected to the high-voltage breakdown test unit 12 through the wire a15, the lower plate 5 is placed on the test bench base 1, the low-voltage pole 6 is connected to the lower plate 5, the low-voltage pole 6 is connected to the high-voltage breakdown test unit 12 through the wire b16, and the test bench base 1 is immersed in the silicone oil of the oil bath pot 8.

[0039] In this embodiment, a spring 7 is embedded on the outside of the high-voltage pole 4 and fixed by a cross bar provided in the middle of the high-voltage pole 4. The spring 7 is used to ensure that each high-voltage pole 4 is tightly pressed against the sample.

[0040] In this embodiment, the test bench base 1 is made of high thermal conductivity ceramics. During high temperature testing, since the test bench base 1 is made of high thermal conductivity ceramic materials, it can not only quickly raise the lower electrode plate 5 to the target temperature and maintain good temperature stability, but also play an insulating role between the lower electrode plate and the oil bath pot 8.

[0041] In this embodiment, the upper electrode integrated board 2 is made of acrylic board or epoxy resin.

[0042] In this embodiment, the size of the upper electrode integrated board 2 is 20*20 cm, and the front, back, left, and right intervals of the high-voltage poles 4 are 4 cm.

[0043] In this embodiment, the high-voltage pole 4 is made of steel, and the lower end is hemispherical.

[0044] In this embodiment, the lower electrode plate 5 is lower than the silicone oil level in the oil bath 8 .

[0045] In this embodiment, the electrostatic capacitive linear encoder 3 has a certain heat resistance, and the measurement accuracy can reach 0.001 mm.

[0046] In this embodiment, the connection points of the high-voltage pole 4 are insulated, and the low-voltage pole 6 is made of the same material as the lower plate 5 .

[0047] During the voltage breakdown strength test, first, the upper electrode integrated board 2 is lifted, and the sample to be tested is placed on the lower electrode board 5, below the high-voltage pole 4, and then the upper electrode integrated board 2 is lowered so that the high-voltage pole 4 is pressed on the sample to be tested. During the test, the high-voltage breakdown strength test mode is selected on the computer 9, and the high-voltage pole 4 corresponding to the test point is selected; the boost mode is selected, and gradient boost or linear boost is selected. In the gradient boost mode, the boost step size is selected, and the boost rate is selected in the linear boost mode, and then the boost voltage waveform is selected. The high-voltage breakdown test unit 12 is energized in sequence according to the selected high-voltage pole 4. When the previous test point breaks down, the next point test is started. The thickness data of the sample to be tested is transmitted to the computer 9 via the electrostatic capacitive linear encoder 3 through the data line, the data storage folder is selected, the high-voltage breakdown strength unit 12 and the hysteresis loop test unit power 13 are turned on, and the measurement is clicked on the computer 9. After the sample breakdown is completed, if it is necessary to continue testing, move the sample to test the next test point or change the sample, and repeat the above operation.

[0048] The array and integrated thickness measurement test bench design enables multiple samples to be tested simultaneously, greatly improving test efficiency and measurement accuracy.

[0049] The hysteresis loop test method is similar to the voltage breakdown strength test method, except that the low-voltage pole 6 is connected to the hysteresis loop test unit 13 through the wire b16, the area of the sample to be tested is input on the computer, the charge capacity of each charge is selected for measurement, and in the hysteresis loop test, the boost mode is the gradient boost mode, and the rest of the operations are the same as above.

[0050] Specific implementation method 2: See Figure 1-3 To illustrate this embodiment, the high voltage breakdown strength testing method includes the following steps:

[0051] Step 1: Lift the upper electrode integrated board 2, place the sample to be tested on top of the lower electrode board 5 and below the high-voltage pole 4, then lower the upper electrode integrated board 2 so that the high-voltage pole 4 is pressed on the sample to be tested;

[0052] Step 2: During the test, select the high-voltage pole 4 corresponding to the test point, select the boost mode, select gradient boost or linear boost, select the boost step size in gradient boost mode, select the boost rate in linear boost mode, and then select the boost voltage waveform;

[0053] Step 3: The thickness data of the sample to be tested is transmitted to the computer 9 via the electrostatic capacitive linear encoder 3 through the data line, and the data is stored;

[0054] Step 4: Click Start Measurement on the computer 9, and then turn on the power of the high voltage breakdown test unit 12;

[0055] Step 5: The high voltage breakdown test unit 12 is energized in sequence according to the selected high voltage poles 4, and the next test point is started when the previous test point breaks down.

[0056] Specific implementation 3: See Figure 1-3 In this embodiment, the hysteresis loop testing method is described, wherein the low voltage pole 6 is connected to the hysteresis loop testing unit 13 via a wire b16, and includes the following steps:

[0057] Step 1: Lift the upper electrode integrated board 2, place the sample to be tested on top of the lower electrode board 5 and below the high-voltage pole 4, then lower the upper electrode integrated board 2 so that the high-voltage pole 4 is pressed on the sample to be tested;

[0058] Step 2: During the test, select the high-voltage pole 4 corresponding to the test point, select gradient boost, in gradient boost mode, select the boost step size, and then select the boost voltage waveform;

[0059] Step 3: The thickness data of the sample to be tested is transmitted to the computer 9 via the electrostatic capacitive linear encoder 3 through the data line, and the data is stored;

[0060] Step 4: Turn on the power of the hysteresis loop test unit 13, enter the area of the sample to be tested on the computer 9, select the charge capacity per charge, and then click Start Measurement;

[0061] Step 5: The hysteresis loop test unit 13 is energized in sequence according to the selected high-voltage poles 4, and starts testing the next test point when the previous test point breaks down.

[0062] The specific embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The specific embodiments do not describe all details in detail, nor do they limit the invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A multi-channel dielectric material displacement-electric field hysteresis loop testing device, characterized by: The invention comprises an oil bath pot (8), a computer (9), a test system (10) and a test bench (11), wherein the test system (10) comprises a high-voltage breakdown test unit (12) and an electric hysteresis loop test unit (13), wherein the high-voltage breakdown test unit (12) and the electric hysteresis loop test unit (13) are connected via a data line b (17), and the signal output ends of the high-voltage breakdown test unit (12) and the electric hysteresis loop test unit (13) are connected to the computer (9) via a data line c (18), and the test bench (11) comprises a test bench base (1), an upper electrode integrated board (2), an electrostatic capacitive linear encoder (3), a high-voltage pole (4), a lower plate (5) and a low-voltage pole (6), wherein the upper electrode integrated board (2) integrates 16 high-voltage poles (4) on an insulating plate. The upper electrode integrated board (2) is mounted on the side of the test bench base (1) through a slide rail, 16 electrostatic capacitive linear encoders (3) are provided, and the 16 electrostatic capacitive linear encoders (3) are mounted on the upper electrode integrated board (2) and respectively nested on the high-voltage pole pole (4), the electrostatic capacitive linear encoder (3) is connected to the computer (9) through a data line a (14), the upper end of the high-voltage pole pole (4) is connected to the high-voltage breakdown test unit (12) through a wire a (15), the lower plate (5) is placed on the test bench base (1), the low-voltage pole pole (6) is connected to the lower plate (5), the low-voltage pole pole (6) is connected to the high-voltage breakdown test unit (12) through a wire b (16), and the test bench base (1) is immersed in silicone oil in an oil bath pot (8).

2. The multi-channel dielectric material displacement-electric field hysteresis loop testing device according to claim 1, characterized in that: A spring (7) is nested on the outside of the high-voltage pole (4), and the spring (7) is fixed by a crossbar provided in the middle of the high-voltage pole (4).

3. The multi-channel dielectric material displacement-electric field hysteresis loop testing device according to claim 1, characterized in that: The test bench base (1) is made of heat-conducting ceramics.

4. The multi-channel dielectric material displacement-electric field hysteresis loop testing device according to claim 1, characterized in that: The upper electrode integrated plate (2) is made of an acrylic plate or epoxy resin.

5. The multi-channel dielectric material displacement-electric field hysteresis loop testing device according to claim 1, characterized in that: The size of the upper electrode integrated plate (2) is 20*20 cm, and the front, back, left, and right spacing of the high-voltage poles (4) is 4 cm.

6. The multi-channel dielectric material displacement-electric field hysteresis loop testing device according to claim 1, characterized in that: The high-voltage pole (4) is made of steel, and the lower end is hemispherical.

7. The multi-channel dielectric material displacement-electric field hysteresis loop testing device according to claim 1, characterized in that: The lower electrode plate (5) is lower than the silicone oil level in the oil bath pot (8).

8. A method for testing a multi-channel dielectric material displacement-electric field hysteresis loop testing device according to any one of claims 1 to 7, characterized in that: It includes high voltage breakdown strength test method and hysteresis loop test method.

9. The method for testing a multi-channel dielectric material displacement-electric field hysteresis loop testing device according to claim 8, characterized in that: The high voltage breakdown strength testing method comprises the following steps: Step 1: Lift the upper electrode integrated board (2), place the sample to be tested on top of the lower electrode board (5) and below the high-voltage pole (4), and then lower the upper electrode integrated board (2) so that the high-voltage pole (4) is pressed on the sample to be tested; Step 2: During the test, select the high voltage pole (4) corresponding to the test point, select the boost mode, select gradient boost or linear boost, select the boost step size in gradient boost mode, select the boost rate in linear boost mode, and then select the boost voltage waveform; Step 3: The thickness data of the sample to be tested is transmitted to the computer (9) via the electrostatic capacitive linear encoder (3) through the data line, and the data is stored; Step 4: Click on the computer (9) to start measurement, and then turn on the power of the high voltage breakdown test unit (12); Step 5: The high voltage breakdown test unit (12) is energized in sequence according to the selected high voltage poles (4), and the next test point is started after the previous test point breaks down.

10. The testing method of a multi-channel dielectric material displacement-electric field hysteresis loop testing device according to claim 8, characterized in that: In the electric hysteresis loop testing method, a low-voltage pole (6) is connected to an electric hysteresis loop testing unit (13) via a wire b (16), and the method comprises the following steps: Step 1: Lift the upper electrode integrated board (2), place the sample to be tested on top of the lower electrode board (5) and below the high-voltage pole (4), and then lower the upper electrode integrated board (2) so that the high-voltage pole (4) is pressed on the sample to be tested; Step 2: During the test, select the high voltage pole (4) corresponding to the test point, select gradient boost, select the boost step size in the gradient boost mode, and then select the boost voltage waveform; Step 3: The thickness data of the sample to be tested is transmitted to the computer (9) via the electrostatic capacitive linear encoder (3) through the data line, and the data is stored; Step 4: Turn on the power of the hysteresis loop test unit (13), enter the area of the sample to be tested on the computer (9), select the charge capacity per charge, and then click to start measurement; Step 5: The hysteresis loop test unit (13) is energized in sequence according to the selected high-voltage poles (4), and the next test point is started when the previous test point breaks down. Step 3: The high voltage breakdown test unit (12) is energized in sequence according to the selected high voltage poles (4), and the next test point is started when the previous test point breaks down; Step 4: The thickness data of the sample to be tested is transmitted to the computer (9) via the electrostatic capacitive linear encoder (3) through the data line, and the data is stored; Step 5: Turn on the power of the hysteresis loop test unit (13), enter the area of the sample to be tested on the computer (9), select the charge capacity per charge, and then click to start measurement.

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