Charging and discharging current device and system of solid-liquid multipurpose composite dielectric material

Abstract

The invention provides a charging and discharging current device and system for a solid-liquid multipurpose composite dielectric material. The charging and discharging current device mainly comprises a pressure tank, a three-electrode device (a high-voltage electrode, a test electrode and a leakage-proof current electrode), an electrometer, a program-controlled high-voltage power supply, a high-voltage relay, an air blast drying box and a computer. According to the invention, the charging and discharging current test of the liquid dielectric material can be realized, and the charging and discharging current test of solid-solid and solid-liquid multiphase composite dielectric materials can also be carried out; on the basis, a temperature control oven is added, and charge and discharge current detection at different temperatures can be carried out. The technical problems existing at present are solved, and charging and discharging current detection of the solid-liquid multipurpose composite dielectric material at different temperatures is achieved.

Description

Technical Field

[0001] The invention relates to the field of high voltage insulation testing, and in particular to a charging and discharging current device and system of a solid-liquid multi-purpose composite dielectric material. Background Art

[0002] In high-voltage electrical equipment, dielectric materials such as insulating oil, insulating paper, epoxy resin and other solid, liquid and solid-liquid multiphase composite dielectric materials play a vital role. The insulation performance of these materials in electrical equipment is directly related to the safety and reliability of the equipment. As time goes by and the equipment operating environment becomes more complex, these dielectric materials will be affected by electrical, thermal, mechanical and other factors, causing their insulation performance to gradually decline, increasing the risk of equipment failure.

[0003] In order to evaluate and monitor the aging state of dielectric materials, charge and discharge current testing and analysis technology came into being. Since the 1990s, this technology has undergone nearly 30 years of development and has become an important means to characterize the aging state of dielectric materials. Researchers have conducted in-depth research on the methods, processes, parameters, and influencing factors such as moisture and temperature of charge and discharge current testing in the laboratory, and have made significant progress.

[0004] However, existing charge and discharge current test equipment is incapable of effectively testing liquid dielectric materials or solid-liquid multiphase composite dielectric materials. Traditional charge and discharge current test methods may be designed mainly for single solid dielectric materials, while liquid or solid-liquid composite dielectric materials may require different test methods and equipment, container and electrode design issues.

[0005] For example, liquid dielectric materials require special container and electrode designs to prevent leakage and ensure the stability of electrical contact. Existing equipment may lead to leakage risks during testing, affecting the accuracy of test results.

[0006] In addition, solid-liquid composites may require testing equipment that can simulate the stress and strain under actual working conditions. For example, liquid materials may require special electrode design and testing environment to avoid the fluidity of the material affecting the test results. And under high voltage and high current test conditions, liquid dielectric materials may have the risk of leakage or arcing, and existing equipment may not have adequate safety measures to handle these potential hazards.

[0007] In addition, temperature is a key factor in charge and discharge current testing because it can affect the conductivity and dielectric constant of dielectric materials. Existing equipment may lack precise temperature control mechanisms, which affects the accuracy and repeatability of test results. The inadequacy of temperature control in existing equipment also limits its effectiveness in practical applications. The existence of these problems still makes the performance evaluation and monitoring of dielectric materials face challenges. Summary of the invention

[0008] The purpose of the present invention is to provide a charge and discharge current device and system for solid-liquid multi-purpose composite dielectric materials, which can not only realize the charge and discharge current test of liquid dielectric materials, but also can carry out the charge and discharge current test of solid-solid and solid-liquid multiphase composite dielectric materials.

[0009] In order to achieve the above object, the present invention is implemented through the following technical solutions: A charge-discharge current device for a solid-liquid multipurpose composite dielectric material, comprising a pressure tank and a three-electrode device 17, wherein the pressure tank comprises a pressure tank body 6 and a pressure tank flange cover 7 covering the pressure tank body 6, and the pressure tank is provided with a drain valve 10, an air extraction valve 11, a first interface 8 and a second interface 9; The three-electrode device 17 is placed inside the pressure tank, including a sample storage tank 18, an insulating cover 19, a high-voltage electrode 20, a test electrode 21, an insulating layer 22, a first interface 23 of the three-electrode device, a second interface 24 of the three-electrode device, and a metal rod 25; the insulating cover 19 covers the sample storage tank 18, and has a hole in the middle, through which the metal rod 25 passes, the lower end of the metal rod 25 is connected to the high-voltage electrode 20, and the top end is provided with the first interface 23 of the three-electrode device, and the first interface 23 of the three-electrode device is located between the sample storage tank 18 and the insulating layer 22. The cover plate 19 is formed outside the tank body, the high-voltage electrode 20 is located inside the tank body formed by the sample storage tank 18 and the insulating cover plate 19 and has a certain distance from the bottom, a groove is provided at the bottom of the inner cavity of the sample storage tank 18, a test electrode 21 and an insulating layer 22 wrapping around and at the bottom of the test electrode 21 are provided in the groove, the test electrode 21 is connected to the second interface 24 of the three-electrode device outside the tank body through a conductive connection, the first interface 23 of the three-electrode device is electrically connected to the first interface 8, and the second interface 24 of the three-electrode device is electrically connected to the second interface 9; The top plane of the insulating layer 22 and the top plane of the test electrode 21 are at the same height as the bottom surface of the sample storage tank 18 .

[0010] Furthermore, the three-electrode device 17 also includes a spring 26 , which is sleeved on the portion of the metal rod 25 located inside the tank body. One end of the spring 26 is fixed to the inner side of the insulating cover plate 19 , and the other end is fixed to the high-voltage electrode 20 .

[0011] Furthermore, the pressure tank further comprises a rubber sealing ring 13, which is arranged between the pressure tank body 6 and the pressure tank flange cover 7 and is used for sealing the pressure tank.

[0012] Furthermore, the pressure tank also includes a pressure gauge 12 . Furthermore, the liquid discharge valve 10 , the air extraction valve 11 , the first interface 8 and the second interface 9 are all arranged on the flange cover 7 of the pressure tank.

[0013] Furthermore, the pressure tank also includes a pressure tank grounding terminal 15, and the three-electrode device 17 also includes a three-electrode device grounding terminal 27, which are respectively used for grounding the pressure tank and the three-electrode device. The sample storage tank 18 is electrically connected to the pressure tank grounding system as an anti-leakage current electrode in the three-electrode device. The pressure tank grounding system includes a pressure tank grounding terminal, a three-electrode device grounding terminal and a blast drying box grounding terminal, and all three are electrically connected.

[0014] Furthermore, the three-electrode device is equipped with an insulating circular ring plate, and the inner diameter of the insulating circular ring plate is not larger than the diameter of the high-voltage electrode and the test electrode.

[0015] Furthermore, the first interface 8 is a multi-core self-locking aviation plug, and the first interface 8 is connected to the high-voltage electrode 20 of the three-electrode device 17 via a silicone wire; The second interface 9 is a triaxial flange terminal, the flange square plate of which is fixed to the pressure tank by bolts, a sealing gasket is provided between the flange square plate and the pressure tank, and the connecting wire of the test electrode 21 passes through the insulating cover plate 19 and is connected to the inner conductor of the triaxial flange terminal.

[0016] The charging and discharging current system of the solid-liquid multipurpose composite dielectric material is characterized by comprising the charging and discharging current device of the solid-liquid multipurpose composite dielectric material, a computer 1, a high-voltage direct current source 2, a high-voltage relay 3 and an electrometer 4; The high-voltage direct current source 2 is electrically connected to the first interface 8 via the high-voltage relay 3, and is used to control the programmable high-voltage source to output high-voltage electricity; The electrometer is electrically connected to the second interface 9; The computer 1 is electrically connected to the high voltage direct current source 2 and is used to control the program-controlled high voltage source to output high voltage electricity; The computer 1 is electrically connected to the high-voltage relay 3 and is used to control the action of the high-voltage relay; The computer 1 is electrically connected to the electrometer 4 and is used to obtain current data measured by the electrometer.

[0017] Furthermore, the pressure tank is placed in a blast drying oven 5 to control the temperature of the test system.

[0018] The advantages of the present invention are: This application adopts an innovative three-electrode structure design, which can not only perform charge and discharge current tests on liquid dielectric materials, but also meet the testing requirements of solid-solid and solid-liquid multiphase composite dielectric materials. This new structure of electrode device, through its unique design, enables more accurate measurement and analysis of current changes during the charge and discharge process, which is crucial for evaluating the performance of dielectric materials.

[0019] The present invention integrates a temperature-controlled oven into the existing test device. This innovation enables the test system to perform charge and discharge current detection under precisely controlled temperature conditions. In this way, researchers can simulate the working state of dielectric materials at different ambient temperatures, thereby gaining a more comprehensive understanding of the performance of the materials in practical applications. This temperature control function is particularly important for studying the thermal stability and temperature dependence of materials.

[0020] The present invention introduces a programmable high-voltage relay between the high-voltage power supply and the high-voltage electrode. This device can automatically switch the test circuit according to the specific test requirements, making the test process of charging current and discharging current more automated and accurate. This automated test circuit switching not only improves the convenience of the experiment, but also significantly improves the accuracy and reliability of the test results.

[0021] In order to further enhance the stability and adaptability of the test, the present invention also adds a pressure tank outside the three-electrode device. This design can not only ensure the stability of the test process, but also can perform charge and discharge current tests under different atmosphere conditions. This is of great significance for studying the performance changes of dielectric materials under specific atmospheres and various environmental conditions that may be encountered in practical applications.

[0022] In summary, the present invention has made a series of improvements and optimizations to the technical problems existing in the current field of dielectric material testing. Through these innovative measures, the present invention realizes the detection of charge and discharge current of solid-liquid multi-purpose composite dielectric materials under different temperature conditions, providing more accurate and comprehensive data support for the evaluation and optimization of material properties. These technical improvements not only improve the efficiency and accuracy of the test, but also open up new possibilities for the research and application of dielectric materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the charge and discharge current system of the solid-liquid multi-purpose composite dielectric material of Example 1 of the present invention; Figure 2 This is a schematic diagram of the structure of a charge and discharge current device for a solid-liquid multi-purpose composite dielectric material according to Example 2 of the present invention; Among them, 1-computer; 2-high voltage power supply; 3-high voltage relay; 4-electrostatic meter; 5-blast drying oven; 6-pressure tank body; 7-pressure tank flange cover; 8-first interface; 9-second interface; 10-liquid discharge valve; 11-vacuum valve; 12-barometer; 13-rubber sealing ring; 14-blast drying oven grounding terminal; 15-pressure tank grounding terminal; 16-three coaxial cables; 17-three-electrode device; 18-sample storage tank; 19-insulating cover; 20-high voltage electrode; 21-test electrode; 22-insulating layer; 23-first interface of the three-electrode device; 24-second interface of the three-electrode device; 25-metal rod; 26-spring; 27-grounding terminal of the three-electrode device. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1 This embodiment discloses a charge and discharge current device of a solid-liquid multi-purpose composite dielectric material. Please refer to Figure 1 , including a pressure tank and a three-electrode device 17.

[0026] The pressure tank comprises a pressure tank body 6 and a pressure tank flange cover 7 covering the pressure tank body 6. The pressure tank is provided with a drain valve 10, an air extraction valve 11, a first interface 8, a second interface 9, a rubber sealing ring 13 and a barometer 12.

[0027] The rubber sealing ring 13 is arranged between the pressure tank body 6 and the pressure tank flange cover 7 to seal the pressure tank.

[0028] The three-electrode device 17 is placed inside the pressure tank, and includes a sample storage tank 18, an insulating cover 19, a high-voltage electrode 20, a test electrode 21, an insulating layer 22, a first interface 23 of the three-electrode device, a second interface 24 of the three-electrode device, a metal rod 25, and a spring 26. The insulating cover 19 covers the sample storage tank 18, and has a hole in the middle. The metal rod 25 passes through the hole. The lower end of the metal rod 25 is connected to the high-voltage electrode 20, and the top end is provided with a first interface 23 of the three-electrode device. The first interface 23 of the three-electrode device is located outside the tank body formed by the sample storage tank 18 and the insulating cover 19. The high-voltage electrode 20 is located inside the tank body formed by the sample storage tank 18 and the insulating cover 19 and has a certain distance from the bottom. A groove is provided at the bottom of the inner cavity of the sample storage tank 18, and a test electrode 21 and an insulating layer 22 that wraps around and at the bottom of the test electrode 21 are provided in the groove. The test electrode 21 is connected to the second interface 24 of the three-electrode device outside the tank body through a conductive connection. The first interface 23 of the three-electrode device is electrically connected to the first interface 8, and the second interface 24 of the three-electrode device is electrically connected to the second interface 9. The spring 26 is sleeved on the part of the metal rod 25 located in the tank body, and one end of the spring 26 is fixed to the inner side of the insulating cover 19, and the other end is fixed to the high-voltage electrode 20.

[0029] The top plane of the insulating layer 22 and the top plane of the test electrode 21 are at the same height as the bottom surface of the sample storage tank 18 .

[0030] The liquid discharge valve 10 , the air extraction valve 11 , the first interface 8 and the second interface 9 are all arranged on the flange cover 7 of the pressure tank.

[0031] The pressure tank grounding system includes a pressure tank grounding terminal 15, a three-electrode device grounding terminal 27 and a blast drying box grounding terminal 14, all of which are electrically connected. The pressure tank grounding terminal 15 is set on the pressure tank, the three-electrode device grounding terminal 27 is set on the three-electrode device 17, and the blast drying box grounding terminal 14 is set on the blast drying box 5, which are used for grounding the pressure tank, the three-electrode device and the blast drying box respectively. The sample storage tank 18 is electrically connected to the pressure tank grounding system as an anti-leakage current electrode in the three-electrode device. The three-electrode device is equipped with an insulating circular ring plate, the inner diameter of which is no larger than the diameter of the high-voltage electrode and the test electrode. The insulating circular plate ring is a separate accessory for testing. It is placed in the sample storage tank only when testing liquid dielectrics. After adding liquid dielectrics, the inner circular hole of the ring forms a liquid gap of fixed height, which is convenient for testing.

[0032] The first interface 8 is a multi-core self-locking aviation plug, and the first interface 8 is connected to the high-voltage electrode 20 of the three-electrode device 17 through a silicone wire.

[0033] The second interface 9 is a triaxial flange terminal, the flange square plate of which is fixed to the pressure tank by bolts, a sealing gasket is provided between the flange square plate and the pressure tank, and the connecting wire of the test electrode 21 passes through the insulating cover plate 19 and is connected to the inner conductor of the triaxial flange terminal.

[0034] Example 2 This embodiment discloses a novel three-electrode device. Figure 2 The three-electrode device 17 is placed inside the pressure tank, including a sample storage tank 18, an insulating cover plate 19, a high-voltage electrode 20, a test electrode 21, an insulating layer 22, a first interface 23 of the three-electrode device, a second interface 24 of the three-electrode device, a metal rod 25, and a spring 26. The sample storage tank 18 is electrically connected to the grounding system of the pressure tank to prevent the leakage current from affecting the test, and serves as an anti-leakage current electrode in the three-electrode device.

[0035] The sample storage tank 18 itself is a metal product (aluminum can), and the pressure tank is also a metal product (aluminum can). When the sample storage tank is placed in the pressure tank, the two are naturally electrically connected. It is only necessary to electrically connect the outside of the pressure tank to the grounding system of the blast drying box (such as adding a wire to connect the outside of the pressure tank and the grounding terminal of the blast drying box).

[0036] A three-electrode device grounding terminal 27 is provided on the sample storage tank 18 and can be installed on the side wall of the tank 18 by fasteners such as screws, and no specific requirements are made.

[0037] The insulating cover 19 covers the sample storage tank 18 and has a hole in the middle. The metal rod 25 passes through the hole. The lower end of the metal rod 25 is electrically connected to the high-voltage electrode 20, and the first interface 23 of the three-electrode device is set at the top. The metal rod 25 can be designed as an aluminum metal rod with a length of 130 mm; the insulating cover 19 can be specifically designed as an epoxy resin cover.

[0038] The first interface 23 of the three-electrode device is located outside the tank body formed by the sample storage tank 18 and the insulating cover 19, and the high-voltage electrode 20 is located inside the tank body formed by the sample storage tank 18 and the insulating cover 19 and has a certain distance from the bottom. A groove is provided at the bottom of the inner cavity of the sample storage tank 18, and a test electrode 21 and an insulating layer 22 that wraps around and at the bottom of the test electrode 21 are provided in the groove. The top plane of the insulating layer 22 and the top plane of the test electrode 21 are at the same height as the bottom surface of the sample storage tank 18.

[0039] The sample storage tank 18 is specifically an aluminum metal tank, which can be designed to have an inner diameter of 120 mm, a depth of 100 mm, a side thickness of 10 mm, a bottom thickness of 20 mm, and a circular groove with a diameter of 50 mm and a depth of 8 mm in the center of the bottom for placing the insulating layer 22 .

[0040] The insulating layer 22 can be designed as a polytetrafluoroethylene plate with a specific size of 50 mm in diameter and 8 mm in thickness. A circular groove with a diameter of 30 mm and a depth of 5 mm is provided in the center. The groove is used to place the test electrode 21 so that the test electrode is isolated from the sample storage tank. The test electrode 21 is connected to the second interface 24 of the three-electrode device outside the tank body through conductive wiring, the first interface 23 of the three-electrode device is electrically connected to the first interface 8, and the second interface 24 of the three-electrode device is electrically connected to the second interface 9.

[0041] The high voltage electrode 20 and the test electrode 21 are both cylindrical aluminum electrodes, with a diameter of 30 mm and a thickness of 5 mm. The spring 26 is sleeved on the part of the metal rod 25 located in the tank body, one end of which is fixed on the inner side of the insulating cover 19 and the other end is fixed on the high voltage electrode 20 , so as to press the sample so that the sample is in close contact with the high voltage electrode 20 and the test electrode 21 .

[0042] The three-electrode device is equipped with an insulating circular ring plate. The inner diameter of the insulating circular ring plate is not larger than the diameter of the high-voltage electrode and the test electrode. The insulating circular ring plate can be used to form a liquid sample gap. Specifically, it can be designed as an epoxy resin circular ring plate with an outer diameter of 120mm, an inner diameter of 20mm, and a thickness of 1mm. When testing liquid dielectrics, the insulating circular plate ring is placed separately in the sample storage tank. After adding liquid dielectrics, the inner circular hole of the ring forms a liquid gap of a fixed height, which is convenient for testing.

[0043] The first interface 8 is a multi-core self-locking aviation plug, and the first interface 8 is connected to the high-voltage electrode 20 of the three-electrode device 17 via a silicone wire; The second interface 9 is a triaxial flange terminal, the flange square plate of the triaxial flange terminal is fixed to the pressure tank by bolts, a sealing gasket is provided between the flange square plate and the pressure tank, and the connecting wire of the test electrode 21 passes through the insulating cover plate 19 and is connected to the inner conductor of the triaxial flange terminal.

[0044] The pressure tank includes a pressure tank body 6, a pressure tank flange cover 7, a rubber sealing ring 13, a liquid discharge valve 10, an air extraction valve 11, a first interface 8 and a second interface 9 of a barometer 1, 2. The rubber sealing ring 13 is arranged between the pressure tank body 6 and the pressure tank flange cover 7 for sealing the pressure tank. The liquid discharge valve 10, the air extraction valve 11, the first interface 8 and the second interface 9 of the barometer 1, 2 are all arranged on the pressure tank flange cover 7.

[0045] Example 3 The present embodiment discloses a charging and discharging current system for a solid-liquid multi-purpose composite dielectric material, comprising a charging and discharging current device for a solid-liquid multi-purpose composite dielectric material, a computer 1, a high-voltage direct current source 2, a high-voltage relay 3 and an electrometer 4, wherein the high-voltage direct current source 2 is electrically connected to a first interface 8 via the high-voltage relay 3, the electrometer is electrically connected to a second interface 9, the computer 1 is connected to the high-voltage direct current source 2 to control the programmable high-voltage source to output high voltage electricity, the computer 1 is linked to the high-voltage relay 3 to control the action of the high-voltage relay, and the computer 1 is connected to the electrometer 4 to obtain current data measured by the electrometer.

[0046] The solid-liquid multi-purpose composite dielectric material charging and discharging current device includes a pressure tank and a three-electrode device 17. The pressure tank includes a pressure tank body 6 and a pressure tank flange cover 7. The pressure tank is provided with a drain valve 10, an exhaust valve 11, a first interface 8 and a second interface 9. The three-electrode device 17 is placed inside the pressure tank and is connected to the first interface 8 and the second interface 9 through the first interface 23 of the three-electrode device and the second interface 24 of the three-electrode device.

[0047] The pressure tank flange cover 7 is installed at the upper opening of the tank body 6 and is sealed and connected by a sealing ring 13 to ensure airtightness. The sealing ring 13 can be a fluororubber O-type sealing ring to ensure its corrosion resistance, high temperature resistance and airtightness of the pressure tank as a whole, and no specific requirements are made.

[0048] The pressure tank body 6 and the flange cover 7 are made of metal and can be designed to be made of stainless steel. The tank body 6 can be designed to be a structure with a depth of 260 mm, an inner diameter of 220 mm, and a thickness of 8 mm, which plays a shielding role and cooperates with the flange cover 7 to form a vacuum cavity or a cavity filled with other atmospheres.

[0049] The pressure tank body 6 is provided with a pressure tank grounding terminal 15, which can be installed on the side wall of the tank body 6 by fasteners such as screws. There is no specific requirement. The grounding terminal of the pressure tank is electrically connected to the grounding system of the blast drying box.

[0050] The pressure tank flange cover 7 is provided with a drain valve 10, an exhaust valve 11 and a pressure gauge 12, and a certain distance is maintained between the three. The exhaust valve 11 can adopt a Swagelok SS-4BG 1 / 4 bellows sealing valve, and there is no specific limitation.

[0051] The pressure tank flange cover is provided with a first interface 8 and a second interface 9. The first interface 8 is preferably a multi-core self-locking aviation plug, specifically a four-core self-locking aviation plug. The first interface 8 is connected to the first interface 23 of the three-electrode device through a 13awg silicone wire, which can better withstand high temperature shock; The first interface 8 connects the high-voltage relay 3 to the program-controlled high-voltage power supply 2. The connection process can be specifically connected through a 13awg silicone wire. The high-voltage relay 3 can preferably be a single-pole double-throw tower vacuum high-voltage relay. During the pressurized charging test, the high-voltage relay 3 switches to the program-controlled DC high-voltage power supply 2. During the short-circuit discharge test, the high-voltage relay 3 switches to the ground terminal; The second interface 9 is preferably a triaxial flange terminal, and the second interface 24 of the three-electrode device is connected to the inner conductor of the triaxial flange terminal. The second interface 9 is connected to the electrometer 4 through a triaxial cable 16 with a semi-conductive layer and low noise.

[0052] The pressure tank is placed in a blast drying oven 5 to control the test temperature. The pressure tank grounding terminal 15 is connected to the blast drying oven grounding terminal 14. The three-electrode device grounding terminal 27 is connected to the inner side of the pressure tank grounding terminal 15 and a grounding operation is performed.

[0053] The upper end and the side end of the blast drying box 5 can be provided with holes for respectively leading out the high voltage wiring and the test wiring, which are not shown in the schematic diagram. In addition, the two wires need to be placed at a certain distance to avoid high voltage interference with the test signal.

[0054] Correspondingly, the programmable high-voltage power supply 2 in the present application can be a programmable DC high-voltage power supply of MAGNA XR10000‑0.2 / 240SP, and its communication interface complies with the RS‑232 protocol. The electrometer 4 can be a Keithley 6514 electrometer, which can more sensitively record small current changes, and the oven 5 can be a Shanghai Yiheng electric hot air drying oven DHG-9070A, without specific limitation. In the present application, the computer 1 can control the output voltage of the programmable high-voltage power supply 2, can control the high-voltage relay 3 to switch the circuit, can control the electrometer 4 to read the data, and realize the fully automatic process through the corresponding software.

[0055] Example 4 The working principle of the above system and device is as follows: Please refer to Figure 1-Figure 2 The sample to be tested is placed between the high-voltage electrode 20 and the test electrode 21 of the three-electrode device 17, with the top of the sample in contact with the high-voltage electrode 20 and the bottom in contact with the test electrode 21. The insulating cover 19 is tightly closed, and the downward pressure of the spring 26 makes the sample in closer contact with the high-voltage electrode 20 and the test electrode 21.

[0056] The three-electrode device 17 is placed in the pressure tank body 6, and the first interface 23 and the second interface 24 of the three-electrode device are respectively connected to the lower ends of the first interface 8 and the second interface 9 on the flange cover 7 to form electrical connections.

[0057] The flange cover 7 is fixed to the pressure tank body 6 by bolts, and vacuum is extracted or different gases, such as nitrogen, are filled in through the exhaust valve 11, and the pressure in the tank can be determined by observing the barometer 12. If necessary, different liquids can be added into the tank body 6 through the drain valve 10.

[0058] Place the pressure tank as a whole in a blast drying oven 5, adjust the temperature setting of the blast drying oven 5, let it stand and heat up to the required temperature for testing, connect the first interface 8 to the corresponding interface of the high-voltage relay 3 through the hole of the blast drying oven 5, connect the second interface 9 to the electrometer 4, and at the same time, connect the programmable high-voltage power supply 2 to the corresponding interface of the high-voltage relay 3.

[0059] Confirm that the computer 1 communicates, can control the programmable high voltage power supply 2, high voltage relay 3, and receive the test results of the electrometer 4.

[0060] Through remote control by computer 1, an instruction is issued, the programmable high-voltage power supply 2 outputs a constant DC high voltage, and the high-voltage relay 3 switches to the programmable high-voltage power supply 2. At this time, the high-voltage electrode 20 applies a constant DC high voltage to the tested sample, synchronously triggering the electrometer 4 to collect the charging current.

[0061] After the charging current test is completed, the computer 1 will re-issue the command, the programmable high-voltage power supply 2 will stop outputting the constant DC high voltage, the high-voltage relay 3 will switch to the ground loop, and the electrometer 4 will be triggered synchronously to collect the discharge current.

[0062] Example 5 Similar to Example 4, this system can also be used for testing solid-liquid and liquid composite materials.

[0063] Solid-liquid composite materials are similar to solid materials. The sample to be tested is placed between the high-voltage electrode 20 and the test electrode 21 of the three-electrode device 17. The top of the sample contacts the high-voltage electrode 20 and the bottom contacts the test electrode 21. The insulating cover 19 is tightly covered. The downward pressure of the spring 26 makes the sample more closely contact with the high-voltage electrode 20 and the test electrode 21. The three-electrode device 17 is placed in the pressure tank body 6, and the first interface 23 and the second interface 24 of the three-electrode device are respectively connected to the lower ends of the first interface 8 and the second interface 9 on the flange cover 7 to form electrical connections. The flange cover 7 is fixed to the pressure tank body 6 by bolts, and vacuum is extracted or filled with different gases or different liquids through the exhaust valve 11.

[0064] Place the pressure tank as a whole in the blast drying oven 5, adjust the temperature setting of the blast drying oven 5, let it stand and heat up to the required temperature for the test, connect the first interface 8 to the corresponding interface of the high-voltage relay 3 through the hole of the blast drying oven 5, connect the second interface 9 to the electrometer 4, and at the same time, connect the program-controlled high-voltage power supply 2 to the corresponding interface of the high-voltage relay 3. Confirm that the computer 1 can communicate, control the program-controlled high-voltage power supply 2 and the high-voltage relay 3, and receive the test results of the electrometer 4.

[0065] Through remote control by computer 1, an instruction is issued, the programmable high-voltage power supply 2 outputs a constant DC high voltage, and the high-voltage relay 3 switches to the programmable high-voltage power supply 2. At this time, the high-voltage electrode 20 applies a constant DC high voltage to the tested sample, synchronously triggering the electrometer 4 to collect the charging current.

[0066] After the charging current test is completed, the computer 1 will re-issue the command, the programmable high-voltage power supply 2 will stop outputting the constant DC high voltage, the high-voltage relay 3 will switch to the ground loop, and the electrometer 4 will be triggered synchronously to collect the discharge current.

[0067] The liquid material can pour the sample to be tested into the three-electrode device 17 and simultaneously cover the high-voltage electrode 20 and the test electrode 21, so that the sample to be tested, the high-voltage electrode 20 and the test electrode 21 are in contact with each other. The remaining steps are similar.

[0068] Through remote control by computer 1, an instruction is issued, the programmable high-voltage power supply 2 outputs a constant DC high voltage, and the high-voltage relay 3 switches to the programmable high-voltage power supply 2. At this time, the high-voltage electrode 20 applies a constant DC high voltage to the tested sample, synchronously triggering the electrometer 4 to collect the charging current.

[0069] After the charging current test is completed, the computer 1 will re-issue the command, the programmable high-voltage power supply 2 will stop outputting the constant DC high voltage, the high-voltage relay 3 will switch to the ground loop, and the electrometer 4 will be triggered synchronously to collect the discharge current.

[0070] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A charge and discharge current device of a solid-liquid multipurpose composite dielectric material, characterized in that: The pressure tank comprises a pressure tank and a three-electrode device (17), wherein the pressure tank comprises a pressure tank body (6) and a pressure tank flange cover (7) covering the pressure tank body (6), and the pressure tank is provided with a liquid discharge valve (10), an air extraction valve (11), a first interface (8) and a second interface (9); The three-electrode device (17) is placed inside the pressure tank, and comprises a sample storage tank (18), an insulating cover plate (19), a high-voltage electrode (20), a test electrode (21), an insulating layer (22), a first interface (23) of the three-electrode device, a second interface (24) of the three-electrode device, and a metal rod (25); the insulating cover plate (19) covers the top of the sample storage tank (18) and has a hole in the middle, through which the metal rod (25) passes; the lower end of the metal rod (25) is connected to the high-voltage electrode (20), and the top end is provided with the first interface (23) of the three-electrode device; the first interface (23) of the three-electrode device is located in the sample storage tank (18). ) and the insulating cover plate (19), the high-voltage electrode (20) is located inside the tank body formed by the sample storage tank (18) and the insulating cover plate (19) and is at a certain distance from the bottom, a groove is provided at the bottom of the inner cavity of the sample storage tank (18), a test electrode (21) and an insulating layer (22) wrapping around and at the bottom of the test electrode (21) are provided in the groove, the test electrode (21) is connected to the second interface (24) of the three-electrode device outside the tank body through a conductive connection, the first interface (23) of the three-electrode device is electrically connected to the first interface (8), and the second interface (24) of the three-electrode device is electrically connected to the second interface (9); The top plane of the insulating layer (22), the top plane of the test electrode (21) and the inner bottom surface of the sample storage tank (18) are at the same height.

2. The charge and discharge current device of the solid-liquid multipurpose composite dielectric material according to claim 1, characterized in that: The three-electrode device (17) further comprises a spring (26), wherein the spring (26) is sleeved on the portion of the metal rod (25) located inside the tank body, one end of the spring (26) is fixed to the inner side of the insulating cover plate (19), and the other end is fixed to the high-voltage electrode (20).

3. The charge-discharge current device of the solid-liquid multipurpose composite dielectric material according to claim 1, characterized in that: The pressure tank further comprises a rubber sealing ring (13), wherein the rubber sealing ring (13) is arranged between the pressure tank body (6) and the pressure tank flange cover (7) and is used for sealing the pressure tank.

4. The charge-discharge current device of the solid-liquid multipurpose composite dielectric material according to claim 1, characterized in that: The pressure tank also includes a pressure gauge (12).

5. The charge-discharge current device of the solid-liquid multipurpose composite dielectric material according to claim 1, characterized in that: The liquid discharge valve (10), the air extraction valve (11), the first interface (8) and the second interface (9) are all arranged on the flange cover (7) of the pressure tank.

6. The charge-discharge current device of the solid-liquid multipurpose composite dielectric material according to claim 1, characterized in that: The pressure tank further comprises a pressure tank grounding terminal (15), and the three-electrode device (17) further comprises a three-electrode device grounding terminal (27), which are used for grounding the pressure tank and the three-electrode device respectively. The tank body of the sample storage tank (18) is electrically connected to the pressure tank grounding system and serves as an anti-leakage current electrode in the three-electrode device.

7. The charge-discharge current device of the solid-liquid multipurpose composite dielectric material according to claim 1, characterized in that: The three-electrode device is equipped with an insulating circular ring plate, and the inner diameter of the insulating circular ring plate is not larger than the diameter of the high-voltage electrode and the test electrode.

8. The charge-discharge current device of the solid-liquid multipurpose composite dielectric material according to claim 1, characterized in that: The first interface (8) is a multi-core self-locking aviation plug, and the first interface (8) is connected to the high-voltage electrode (20) of the three-electrode device (17) via a silicone wire; The second interface (9) is a triaxial flange terminal, the flange square plate of the triaxial flange terminal is fixed to the pressure tank by bolts, a sealing gasket is provided between the flange square plate and the pressure tank, and the connecting wire of the test electrode (21) passes through the insulating cover plate (19) and is connected to the inner conductor of the triaxial flange terminal.

9. A charge and discharge current system of a solid-liquid multipurpose composite dielectric material, characterized in that: The invention comprises a charging and discharging current device of the solid-liquid multi-purpose composite dielectric material as claimed in any one of claims 1 to 8, a computer (1), a high-voltage direct current source (2), a high-voltage relay (3) and an electrometer (4), wherein the high-voltage direct current source (2) is electrically connected to a first interface (8) via the high-voltage relay (3), the electrometer is electrically connected to a second interface (9), and the computer (1) is electrically connected to the high-voltage direct current source (2), the high-voltage relay (3) and the electrometer (4).

10. The charge and discharge current system of the solid-liquid multi-purpose composite dielectric material according to claim 9, characterized in that: The pressure tank is placed in a blast drying oven (5).

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