Multifunctional three-electrode device and system for measuring dielectric property of insulating material

Abstract

The utility model belongs to the field of dielectric property measurement of insulating materials, relates to a multifunctional three-electrode device and system for measuring dielectric properties of insulating materials, and aims to solve the problem that the existing three-electrode device cannot regulate and control electric field intensity, temperature and pressure at the same time. The device comprises a sealing cavity formed by an upper cover plate, a lower bottom cover, a glass test tank and an epoxy rod, an unprotected electrode, a protected electrode and a protected electrode are arranged in the sealing cavity, and a sensor, a pressure gauge and the like can be selected. The system integrates a temperature control box, a gas cylinder and a multi-type electric field adjusting module (including a direct current, an alternating current or an alternating current and direct current composite voltage source). The device and the system can comprehensively measure the conductivity, the dielectric constant and the dielectric loss of single and composite insulating materials under different working conditions, provide key technical support for insulating structure design, health state evaluation and fault analysis of power equipment, and have remarkable engineering application value.

Description

Technical Field

[0001] The utility model belongs to the field of dielectric property measurement of insulating materials, and relates to a multifunctional three-electrode device and a system for measuring the dielectric property of insulating materials. Background Art

[0002] Liquid-solid insulation (oil-immersed transformers, oil-immersed instrument transformers, oil-immersed insulating bushings), gas-solid insulation (gas-insulated metal-enclosed switchgear, epoxy-impregnated paper insulating bushings, dry-type epoxy transformers), and solid insulation (cross-linked polyethylene cables) are widely used in power grids. Liquid-solid insulation primarily consists of liquid insulating oil and solid insulating paper, while gas-solid insulation primarily consists of SF6 gas and epoxy solid insulation. Solid insulation materials primarily include cross-linked polyethylene and epoxy insulation. Insulation materials are key components of power equipment, and their properties determine their performance. Understanding the conductivity, dielectric constant, and dielectric loss of single insulating materials (gas, liquid, solid), gas-solid composite insulation materials, and liquid-solid composite insulation materials under different temperatures, pressures, and electric field strengths is a key tool for supporting insulation structure design, operational health assessment, and failure mechanism analysis of power equipment.

[0003] Currently, existing small-scale three-electrode devices are mainly suitable for measuring the dielectric properties of pure solid insulating materials, and can only control the electric field strength value during measurement. For pure liquid insulating materials and liquid-solid composite insulating materials, existing three-electrode devices do not have the function of measuring field strength, measuring temperature, and jointly controlling liquid pressure. On the other hand, for pure gas insulating materials and gas-solid composite insulating materials, existing three-electrode devices do not have the function of measuring field strength, measuring temperature, and jointly controlling gas pressure. However, during the operation of power equipment, the electric field strength, temperature, and pressure in different parts of the equipment are different. Therefore, designing a multifunctional three-electrode device and system that can measure the dielectric properties of insulating materials is of great engineering value. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a multifunctional three-electrode device and system for measuring the dielectric properties of insulating materials, so as to solve the existing problems.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a multifunctional three-electrode device for measuring the dielectric properties of insulating materials, comprising an upper cover plate and a lower bottom cover, and a glass test jar arranged between the upper cover plate and the lower bottom cover; an epoxy rod is further arranged between the upper cover plate and the lower bottom cover on the periphery of the glass test jar, serving as a compression screw between the upper cover plate and the lower bottom cover; the upper cover plate, the lower bottom cover and the glass test jar are tightly sealed by a fixing nut to form a sealed cavity; an unprotected electrode is arranged at the center of the upper cover plate and inserted into the sealed cavity, and a protected electrode and a protecting electrode are respectively arranged on the lower bottom cover.

[0006] Optionally, a sensor is installed on the lower bottom cover, and the upper cover is connected to a pressure gauge that is in communication with the sealing cavity.

[0007] Optionally, the unprotected electrode includes an upper electrode rod passing through the upper cover plate, an upper electrode arranged in the sealed cavity and connected to the upper electrode rod, and a wire pressing ball nut and a pressure equalizing ring arranged outside the sealed cavity and connected to the upper electrode rod.

[0008] Optionally, a locking nut is further provided on the upper cover plate, a stud is screwed into the locking nut, the upper electrode rod passes through the center of the locking nut and the stud, and a thread for screwing with the stud is further provided on the surface of the upper electrode rod for moving up and down;

[0009] A sealing ring is also provided on the periphery of the upper electrode rod at the top of the stud.

[0010] Optionally, an electrode support seat for supporting the protected electrode and the protecting electrode is further provided on the lower bottom cover in the sealed cavity;

[0011] The protected electrode includes a low-voltage electrode close to the unprotected electrode, a second electrode screw fixed to the electrode support and connected to the low-voltage electrode, and a low-voltage electrode connector fixed to the lower bottom cover via a compression screw and a sealing ring, and the second electrode screw and the low-voltage electrode connector are connected via an electrode flexible connector;

[0012] The protective electrode includes a first electrode screw that is fixed on the electrode support seat, a grounding electrode connected to one end of the first electrode screw and arranged on the periphery of the low-voltage electrode, and a grounding electrode connector that is fixed on the lower bottom cover through a tightening screw and a sealing ring. The grounding electrode connector is connected to the first electrode screw through an electrode soft connection.

[0013] Optionally, the upper cover plate and the lower bottom cover are provided with channels communicating with the sealing cavity, and the outsides of the channels are respectively connected to gas injection and release ball valves.

[0014] Optionally, a sealing gasket is provided at the connection between the glass test jar and the upper cover plate and the lower bottom cover.

[0015] A multifunctional three-electrode system for measuring the dielectric properties of insulating materials uses a multifunctional three-electrode device for measuring the dielectric properties of insulating materials as described above, including a three-electrode device body, a temperature control box arranged outside the three-electrode device body, a gas cylinder connected to the three-electrode device body, and multiple types of electric field adjustment modules connected to the three-electrode device body.

[0016] Optionally, the multi-type electric field regulation module includes a voltage source, an electrometer, and a PC-side data processing device, which are respectively connected to the three-electrode device body.

[0017] Optionally, the voltage source includes a DC voltage source, an AC voltage source, or an AC / DC composite voltage source.

[0018] The beneficial effects of the present invention are as follows: the present invention satisfies the measurement function of the electrical conductivity, dielectric constant and dielectric loss of single insulating materials (gas insulating materials, liquid insulating materials and solid insulating materials), gas-solid composite insulating materials and liquid-solid composite insulating materials under the combined action of different temperatures, different pressures and different electric field strengths, and can provide technical support for mastering the performance parameters of insulating materials under composite working conditions (electric field, temperature and pressure).

[0019] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0021] Figure 1 Schematic diagram of a multifunctional three-electrode device for measuring dielectric properties of insulating materials according to the present invention;

[0022] Figure 2 Schematic diagram of a multifunctional three-electrode system for measuring dielectric properties of insulating materials according to the present invention;

[0023] Figure 3 This is a schematic diagram of the multifunctional three-electrode device for measuring the dielectric properties of insulating materials without electrodes according to the present invention;

[0024] Figure 4 This is a schematic diagram of measuring pure gas volume conductivity under DC field strength according to the present invention;

[0025] Figure 5 The utility model is used to measure the volume conductivity of pure liquid under DC field strength;

[0026] Figure 6 This is a schematic diagram of the volume conductivity measurement of pure solid and "gas-solid" composite system under DC field strength of the utility model;

[0027] Figure 7 This is a schematic diagram of measuring the volume conductivity of a "liquid-solid" composite system under a DC field strength according to the present invention;

[0028] Figure 8 This is a schematic diagram of the surface conductivity measurement of pure solid and "gas-solid" composite system under DC field strength of the utility model;

[0029] Figure 9 This is a schematic diagram of measuring the surface conductivity of a "liquid-solid" composite system under a DC field strength according to the present invention;

[0030] Figure 10 Schematic diagram of the frequency domain dielectric property measurement of pure solid and "gas-solid" composite system under AC field strength of the utility model;

[0031] Figure 11 This is a schematic diagram of the frequency domain dielectric property measurement of the "liquid-solid" composite system under the AC field strength of the utility model.

[0032] Figure 1: Unprotected electrode 1, pressure gauge 2, protected electrode 3, protective electrode 4, temperature sensor 5, temperature control box 6, voltage source 7, gas injection port ball valve 8, gas cylinder 9, sealing gasket 10, upper pressure cover 11, lower bottom cover 12, glass test jar 13, pressing screw 14, fixing nut 15, pressing ball nut 16, equalizing ring 17, upper electrode rod 18, upper electrode 19, locking nut 20, sealing ring 21, stud 22, low-voltage electrode 23, grounding electrode 24, first electrode screw 25, second electrode screw 26, electrode flexible connection 27, pressing screw 28, O-ring 29, grounding electrode connector 30, low-voltage electrode connector 31, channel 32. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0034] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0035] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] See also Figures 1 to 3This is a multifunctional three-electrode device for measuring the dielectric properties of insulating materials. It includes an upper cover plate and a lower bottom cover 12, and a glass test jar 13 disposed between the upper cover plate and the lower bottom cover 12. An epoxy rod is also disposed on the periphery of the glass test jar 13 between the upper cover plate and the lower bottom cover 12. A compression screw 14 is used to tighten the upper cover plate and the lower bottom cover 12. The upper cover plate, the lower bottom cover 12, and the glass test jar 13 are tightly sealed by a fixing nut 15 to form a sealed cavity. An unprotected electrode 1 is disposed at the center of the upper cover plate and inserted into the sealed cavity. A protected electrode 3 and a guard electrode 4 are disposed on the lower bottom cover 12, respectively. A sensor is installed on the lower bottom cover 12, and a pressure gauge 2 connected to the sealed cavity is connected to the upper cover. The unprotected electrode 1 includes an upper electrode rod 18 that passes through the upper cover, an upper electrode 19 that is arranged in the sealed cavity and connected to the upper electrode rod 18, and a pressure ball nut 16 and a pressure equalizing ring 17 that are arranged outside the sealed cavity and connected to the upper electrode rod 18. A locking nut 20 is also provided on the upper cover, and a stud 22 is screwed into the locking nut 20. The upper electrode rod 18 passes through the center of the locking nut 20 and the stud 22, and its surface is also provided with a thread for screwing with the stud 22 for moving up and down; the stud 2 2 The outer periphery of the upper electrode rod 18 at the top is further provided with a sealing ring 21, and an electrode support seat for supporting the protected electrode 3 and the guard electrode 4 is further provided on the lower bottom cover 12 in the sealed cavity; the protected electrode 3 includes a low-voltage electrode 23 close to the unprotected electrode 1, a second electrode screw 26 fixed through the electrode support seat and connected to the low-voltage electrode 23, and a low-voltage electrode connector 31 fixed through the lower bottom cover 12 via a compression screw 28 and the sealing ring 21, and the second electrode screw 26 and the low-voltage electrode connector 31 are connected by an electrode soft connector 27; the guard electrode 4 includes a low-voltage electrode 23 fixed through the fixed electrode 1 A first electrode screw 25 is fixed on the electrode support seat, a grounding electrode 24 is connected to one end of the first electrode screw 25 and is arranged on the periphery of the low-voltage electrode 23, and a grounding electrode connector 30 is fixed to the lower bottom cover 12 through a tightening screw 28 and a sealing ring 21. The grounding electrode connector 30 is connected to the first electrode screw 25 through an electrode flexible connector 27. A channel 32 communicating with the sealed cavity is provided on the upper cover plate and the lower bottom cover 12. The outside of the channel 32 is connected to a gas injection port ball valve 8. A sealing gasket 10 is provided at the connection between the glass test tank 13 and the upper cover plate and the lower bottom cover 12.

[0037] In the present invention, the electrodes are made of brass, the upper pressure cover 11 and the lower bottom cover 12 are made of EP-FR4 epoxy resin, the side walls of the three-electrode tank are made of tempered glass that can withstand high temperatures of 130°C, and the gas injection port ball valve 8 is made of metal and can withstand high temperatures above 130°C. The entire device meets the high temperature resistance requirements and can meet the test requirements of a minimum test temperature of -40°C and a maximum test temperature of 130°C.

[0038] A multifunctional three-electrode system for measuring the dielectric properties of insulating materials uses a multifunctional three-electrode device for measuring the dielectric properties of insulating materials as described above, including a three-electrode device body, a temperature control box 6 arranged outside the three-electrode device body, a gas cylinder 9 connected to the three-electrode device body, and multiple types of electric field adjustment modules connected to the three-electrode device body, the multiple types of electric field adjustment modules including a voltage source 7 respectively connected to the three-electrode device body, an electrometer, and PC-side data processing, the voltage source 7 including a DC voltage source 7, an AC voltage source 7, or an AC / DC composite voltage source 7.

[0039] The temperature control box 6 of the utility model has an adjustment range of -40℃ to 130℃, and can apply a voltage value of 0 to 40kV. The side wall of the device is made of tempered glass that can withstand different air pressures, and can achieve a pressure adjustment function for gas pressures within the range of -0.5 atmospheres to 3 atmospheres.

[0040] Specific embodiment 1,

[0041] 1. Examples of volume conductivity measurements for different types of insulating materials

[0042] A. DC Volume Conductivity Measurement

[0043] Pure gas insulation materials: such as Figure 4 As shown, first, the gas injection port ball valve 8 of the three electrodes is connected to the external gas cylinder 9, so that the three electrodes are filled with the gas whose volume conductivity needs to be tested. The gas between the unprotected electrode 1 and the protected electrode 3 is the test object, and the gas pressure can be controlled in the range of -0.5 atmosphere to 3 atmospheres; remove the gas cylinder 9, close the gas injection port ball valve 8, and keep the internal sealing state of the three electrodes; place the three electrodes in the temperature control box 6, set the temperature of the temperature control box 6 to a constant temperature, and provide the sample with the temperature environment required for the test measurement; the unprotected electrode 1 is connected to the DC voltage source 7 (providing the voltage required for the volume conductivity test), the protected electrode 3 is connected to the electrometer (real-time test of the current flowing through the sample when pressurized), and the protective electrode 4 is grounded; the DC voltage source 7, the PC end, the electrometer and the temperature control box 6 are all reliably grounded, and the PC end is connected to the electrometer to ensure that information is obtained and preserved during the experiment, and the volume conductivity test of pure gas insulating materials can be carried out.

[0044] Pure liquid insulating materials: such as Figure 5 As shown, the three electrodes are filled with the liquid whose volume conductivity needs to be tested and the liquid is deeper than the unprotected electrode 1. The liquid between the unprotected electrode 1 and the protected electrode 3 is the test object; its wiring method is the same as Figure 4 As shown in the figure, the volume conductivity test of pure liquid insulating materials can be carried out.

[0045] Pure solid, "gas-solid" composite system: such as Figure 6As shown in FIG, when there is no requirement for the gas environment of the test sample, the solid sandwiched between the unprotected electrode 1 and the protected electrode 3 in the three electrodes is the test object; if there is a requirement for the gas environment during the test, the gas in the three electrodes is replaced by the inflation method in (1) A. This gas and the solid sandwiched between the unprotected electrode 1 and the protected electrode 3 in the three electrodes together constitute a "gas-solid" composite system. The gas pressure can be controlled in the range of -0.5 atmospheres to 3 atmospheres. Its wiring method is the same as Figures 4 and 5 As shown in the figure, the volume conductivity test of pure solid and "gas-solid" composite system can be carried out.

[0046] "Liquid-solid" composite insulation materials: such as Figure 7 As shown, the three electrodes are filled with liquid material in the "liquid-solid" composite insulation system whose volume conductivity needs to be tested, which deeply covers the unprotected electrode 1. The solid material in the "liquid-solid" composite insulation system is sandwiched between the unprotected electrode 1 and the protected electrode 3. The "liquid-solid" composite insulation system composed of them is the test object; its wiring method is the same as Figures 4 to 6 As shown in the figure, the volume conductivity test of the "liquid-solid" composite system can be carried out.

[0047] B. AC Volume Conductivity Measurement

[0048] When volume conductivity measurement is required under AC voltage, Figure 4-Figure 7 Simply replace the DC power supply with an AC power supply.

[0049] Specific embodiment 2,

[0050] 1. Examples of surface conductivity measurements of different types of insulating materials

[0051] A. DC surface conductivity measurement

[0052] Pure solid, "gas-solid" composite insulation materials: such as Figure 8As shown, the three electrodes are filled with gas materials in the "gas-solid" composite insulation system whose surface conductivity needs to be tested, and solid materials in the "gas-solid" composite insulation system are sandwiched between the unprotected electrode 1 and the protected electrode 3. The "gas-solid" composite insulation system composed of them is the test object, and the gas pressure can be controlled in the range of -0.5 atmospheres to 3 atmospheres; remove the gas cylinder 9, close the gas injection port ball valve 8, and keep the three electrodes sealed; place the three electrodes in the temperature control box 6, set the temperature control box 6 to a constant temperature, and provide the sample with the temperature environment required for the test measurement; the protective electrode 4 is connected to the DC voltage source 7 (providing the voltage required for the surface conductivity test), the protected electrode 3 is connected to the electrometer (the current flowing through the sample during real-time testing), and the unprotected electrode 1 is grounded; the DC voltage source 7, the PC end, the electrometer and the temperature control box 6 are all reliably grounded, and the PC end is connected to the electrometer to ensure that information is obtained and stored during the experiment, so that pure solid and "gas-solid" composite system surface conductivity tests can be carried out.

[0053] "Liquid-solid" composite insulation materials: such as Figure 9 As shown, the three electrodes are filled with liquid material in the "liquid-solid" composite insulation system whose surface conductivity needs to be tested and deeply submerge the unprotected electrode 1. Solid material in the "liquid-solid" composite insulation system is sandwiched between the unprotected electrode 1 and the protected electrode 3. The "liquid-solid" composite insulation system composed of them is the test object; its wiring method is the same as Figure 8 As shown in the figure, the surface conductivity test of the "liquid-solid" composite system can be carried out.

[0054] B. AC surface conductivity measurement

[0055] When measuring surface conductivity under AC voltage, Figure 8-Figure 9 Simply replace the DC voltage device with an AC voltage device.

[0056] Specific embodiment 3,

[0057] 1. Frequency Domain Dielectric Property Measurement (Dielectric Constant, Dielectric Loss) under AC Voltage

[0058] Pure solid, "gas-solid" composite system: such as Figure 10As shown, the three electrodes are filled with gas materials in the "gas-solid" composite system whose dielectric properties (dielectric constant, dielectric loss) need to be tested, and solid materials in the "gas-solid" composite system are sandwiched between the unprotected electrode 1 and the protected electrode 3. The "gas-solid" composite system composed of them is the test object; the gas cylinder 9 is removed, and the gas injection port ball valve 8 is closed to keep the three electrodes sealed; the three electrodes are placed in the temperature control box 6, and the temperature control box 6 is set to a constant temperature to provide the sample with the temperature environment required for the test measurement; the unprotected electrode 1 is connected to the voltage output terminal of the frequency domain dielectric test equipment (providing the AC voltage required for the dielectric property test), the protected electrode 3 is connected to the current input terminal of the frequency domain dielectric test equipment (real-time testing of the current flowing during the dielectric property test), and the protective electrode 4 is grounded; the frequency domain dielectric test equipment, the PC end and the temperature control box 6 are all reliably grounded, and the PC end is connected to the frequency domain dielectric test equipment to ensure that information is obtained and preserved during the experiment, and the dielectric property test of pure solid and "gas-solid" composite system can be carried out.

[0059] Liquid-solid composite insulation materials: such as Figure 11 As shown, the three electrodes are filled with liquid materials in the "liquid-solid" composite insulation system whose dielectric properties need to be tested and are deep enough to cover the unprotected electrode 1. Solid materials in the "liquid-solid" composite insulation system are sandwiched between the unprotected electrode 1 and the protected electrode 3. The liquid-solid composite insulation system formed by them is the test object; its wiring method is the same as Figure 10 As shown in the figure, the dielectric properties test of the "liquid-solid" composite system can be carried out.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A multifunctional three-electrode device for measuring the dielectric properties of insulating materials, characterized by: The invention comprises an upper cover plate and a lower bottom cover, and a glass test jar arranged between the upper cover plate and the lower bottom cover. An epoxy rod is also arranged between the upper cover plate and the lower bottom cover on the periphery of the glass test jar, serving as a compression screw for the upper cover plate and the lower bottom cover. The upper cover plate, the lower bottom cover and the glass test jar are tightly sealed by a fixing nut to form a sealed cavity. An unprotected electrode inserted into the sealed cavity is arranged at the center of the upper cover plate, and a protected electrode and a protecting electrode are respectively arranged on the lower bottom cover.

2. A multifunctional three-electrode device for measuring dielectric properties of insulating materials according to claim 1, characterized in that: A sensor is installed on the lower bottom cover, and a pressure gauge connected to the sealing cavity is connected to the upper cover.

3. The multifunctional three-electrode device for measuring dielectric properties of insulating materials according to claim 1, characterized in that: The unprotected electrode includes an upper electrode rod passing through the upper cover plate, an upper electrode arranged in the sealed cavity and connected to the upper electrode rod, and a pressure ball nut and a pressure equalizing ring arranged outside the sealed cavity and connected to the upper electrode rod.

4. The multifunctional three-electrode device for measuring dielectric properties of insulating materials according to claim 3, characterized in that: The upper cover is also provided with a locking nut, in which a stud is screwed. The upper electrode rod passes through the center of the locking nut and the stud, and its surface is also provided with a thread for screwing with the stud, which is used for moving up and down. A sealing ring is also provided on the periphery of the upper electrode rod at the top of the stud.

5. The multifunctional three-electrode device for measuring dielectric properties of insulating materials according to claim 1, characterized in that: An electrode support seat for supporting the protected electrode and the protecting electrode is also provided on the lower bottom cover in the sealed cavity; The protected electrode includes a low-voltage electrode close to the unprotected electrode, a second electrode screw fixed to the electrode support and connected to the low-voltage electrode, and a low-voltage electrode connector fixed to the lower bottom cover via a compression screw and a sealing ring, and the second electrode screw and the low-voltage electrode connector are connected via an electrode flexible connector; The protective electrode includes a first electrode screw that is fixed on the electrode support seat, a grounding electrode connected to one end of the first electrode screw and arranged on the periphery of the low-voltage electrode, and a grounding electrode connector that is fixed on the lower bottom cover through a tightening screw and a sealing ring. The grounding electrode connector is connected to the first electrode screw through an electrode soft connection.

6. The multifunctional three-electrode device for measuring dielectric properties of insulating materials according to claim 1, characterized in that: The upper cover plate and the lower bottom cover are provided with channels communicating with the sealing cavity, and the outsides of the channels are respectively connected with gas injection and discharge port ball valves.

7. The multifunctional three-electrode device for measuring dielectric properties of insulating materials according to claim 1, characterized in that: Sealing gaskets are provided at the connections between the glass test jar, the upper cover and the lower bottom cover.

8. A multifunctional three-electrode system for measuring the dielectric properties of insulating materials, using the multifunctional three-electrode device for measuring the dielectric properties of insulating materials according to any one of claims 1 to 7, characterized in that: The invention comprises a three-electrode device body, a temperature control box arranged outside the three-electrode device body, a gas cylinder connected to the three-electrode device body, and multiple types of electric field adjustment modules communicated with the three-electrode device body.

9. The multifunctional three-electrode system for measuring dielectric properties of insulating materials according to claim 8, characterized in that: The multi-type electric field regulation module includes a voltage source, an electrometer, and a PC-side data processing device, which are respectively connected to the three-electrode device body.

10. The multifunctional three-electrode system for measuring dielectric properties of insulating materials according to claim 9, characterized in that: The voltage source includes a DC voltage source, an AC voltage source, or an AC / DC composite voltage source.

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