Alternating current corona aging experiment device and multi-rod plate electrode structure optimization method

Abstract

The invention discloses an alternating current corona aging experiment device and a multi-rod plate electrode structure optimization method, and the device comprises a containing part which is internally provided with a support; the voltage-sharing cover and the disc electrode are arranged on the support, a cylindrical electrode is arranged at the bottom of the voltage-sharing cover, a polymer sample is arranged at the top of the disc electrode, and the polymer sample is located below the cylindrical electrode; one end of the high-voltage lead is connected with the top of the voltage-sharing cover, the other end of the high-voltage lead extends out of the accommodating part and is connected with a protective resistor, the protective resistor is connected with an alternating-current high-voltage source, one end of the alternating-current high-voltage source is used for providing high voltage, and the other end of the alternating-current high-voltage source is grounded. The voltage-sharing cover and the disc electrode are arranged on the bracket, so that the uniformity and the stability of electric field distribution in the experiment process are ensured, the voltage-sharing cover can reduce the fringe effect, and the electric field applied to a polymer sample is more uniform by adjusting the distribution of the cylindrical electrode; the problem that the degradation degrees of all the aging areas of the solid material are inconsistent is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of corona aging test of solid insulating materials, and in particular relates to an AC corona aging experimental device and a multi-rod plate electrode structure optimization method. Background Art

[0002] Since there are inevitably air gaps in power equipment (switch cabinets and generators, etc.), when the electric field strength is large enough, the air will be ionized to form corona, so the problem of corona discharge is difficult to avoid. When corona occurs, the high-energy electrons and ions generated by the discharge will interact with the insulating material, causing the insulation performance of the insulating material to deteriorate. This change may not be easy to detect in the short term, but it will increase the risk of equipment failure over a long period of time, especially in areas with high air humidity. In a high humidity environment, corona discharge will also generate corrosive gases such as nitric acid and ozone, which will further accelerate the degradation process of the material and seriously affect the long-term operation and maintenance of the equipment. In order to evaluate the corona resistance of the insulating material in actual operation, that is, long-term reliability, it is necessary to conduct corona aging tests. By simulating the corona discharge conditions in actual operation, the material degradation process can be accelerated, so that the aging characteristics of the material can be evaluated in a shorter time, which is crucial for the design and selection of insulating materials suitable for specific environmental conditions.

[0003] At present, corona aging tests on polymer materials are often carried out using a needle-plate electrode structure. At the same time, in order to increase the corona aging area, researchers have increased the number of needle electrodes. However, since the length and position of the needle electrodes will affect the electric field strength at the needle tip, the degree of degradation of each aging area of ​​the material is different, such as publication numbers CN 103278752A and CN 109188228A, resulting in uneven electric field strength and inconsistent degradation degrees in each aging area of ​​the material. Summary of the invention

[0004] The purpose of the present invention is to provide an AC corona aging experimental device and a multi-rod plate electrode structure optimization method to solve the technical defects of uneven electric field strength and inconsistent degradation degree of various aging areas of the material caused by corona aging test of polymer materials through needle plate electrode structure.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, an AC corona aging experimental device is provided, comprising:

[0007] a receiving member, in which a bracket is provided;

[0008] A pressure equalizing cover and a disk electrode are arranged on the bracket, and a cylindrical electrode is arranged at the bottom of the pressure equalizing cover, and a polymer sample is arranged on the top of the disk electrode, and the polymer sample is located below the cylindrical electrode;

[0009] A high-voltage lead, one end of which is connected to the top of the voltage-equalizing cover, and the other end of which extends to the outside of the container and is connected to a protective resistor, and the protective resistor is connected to an AC high-voltage source, one end of which is used to provide high voltage, and the other end is used to ground;

[0010] A grounding wire has one end connected to the disk electrode and the other end extending to the outside of the container and connected to the AC high voltage source.

[0011] Furthermore, there are a plurality of cylindrical electrodes, one of which is disposed at the center of the bottom of the pressure equalizing cover, and the other plurality of cylindrical electrodes are distributed around the center of the bottom of the pressure equalizing cover at equally divided angles.

[0012] Furthermore, the diameter of the concentric circles formed between the other plurality of cylindrical electrodes is smaller than the diameter of the pressure equalizing cover.

[0013] Furthermore, the diameter of the cylindrical electrode is 6 mm and the lead angle is 1 mm.

[0014] Furthermore, the circumferential diameter of the disk electrode is smaller than the circumferential diameter of the polymer sample, and the circumferential diameter of the disk electrode is larger than the circumferential diameter of the pressure equalizing cover.

[0015] Furthermore, the container is a constant temperature and humidity chamber.

[0016] Furthermore, the bracket is a structure with one end open and the other end closed, and the pressure equalizing cover, polymer sample and disc electrode are all arranged in the open end of the bracket.

[0017] Furthermore, the bracket is a nylon bracket.

[0018] Furthermore, a cabinet bushing is provided on the outer side of the accommodation component, and the high-voltage lead and the grounding wire both pass through the cabinet bushing to be connected to the AC high-voltage source.

[0019] In a second aspect, a method for optimizing a multi-rod plate electrode structure is provided, comprising:

[0020] Construct a geometric model of a multi-rod plate electrode;

[0021] Using the constructed multi-rod plate electrode geometric model, a distance between the cylindrical electrode and the top of the polymer sample is preset;

[0022] Determine the length of the cylindrical electrode, perform electric field simulation on the concentric circle diameter scanning within a preset range, and determine the concentric circle diameter;

[0023] Based on the determined concentric circle diameter, the length of the cylindrical electrode is re-determined.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. By placing the voltage-equalizing hood and the disc electrode on the bracket, the uniformity and stability of the electric field distribution during the experiment are ensured. The voltage-equalizing hood can reduce the edge effect, making the electric field applied to the polymer sample more uniform, thereby improving the accuracy and reliability of the experimental results. Secondly, the relative positions of the voltage-equalizing hood, the disc electrode and the bracket can achieve consistent experimental conditions between different experimental batches, thereby improving the repeatability and comparability of the experimental results and solving the problem of inconsistent degradation of various aging areas of solid materials.

[0026] 2. It helps to form a more uniform and stable electric field above the polymer sample. The central cylindrical electrode and the cylindrical electrodes equally distributed around it work together to reduce the unevenness and distortion in the electric field, making the electric field applied to the polymer sample closer to the ideal state, thereby improving the accuracy and reliability of the experimental results.

[0027] 3. Since the diameter of the concentric circles is smaller than the diameter of the equalizing hood, the cylindrical electrodes are more compactly distributed at the bottom of the equalizing hood, forming a relatively concentrated electric field region above the polymer sample. The electric field concentration effect can make the polymer sample experience a stronger corona effect in a specific area, thereby accelerating the aging process and shortening the experimental time.

[0028] 4. The lead angle design of the cylindrical electrode helps to reduce the sharpness of the electrode edge, thereby reducing the possibility of tip discharge.

[0029] 5. The size difference between the disk electrode and the polymer sample ensures that the electric field is mainly concentrated on the sample rather than in the gap between the electrode and the sample, reducing the error caused by gap discharge and improving the accuracy of the experimental results.

[0030] 6. The constant temperature and humidity chamber can accurately control the temperature and humidity conditions during the experiment, eliminate the interference of environmental factors on the experimental results, and improve the accuracy and reliability of the experimental results.

[0031] 7. The blocked end of the bracket provides a stable support base for the entire structure, so that the pressure equalizing cover, polymer sample and disc electrode can maintain a relatively stable position during installation and use, and are not prone to shaking or displacement.

[0032] 8. Nylon is a material with good insulation properties. Nylon brackets can effectively isolate current in high-voltage corona aging experiments and prevent current from flowing through the bracket to unintended paths. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic diagram of an AC corona aging experimental device provided by the present invention;

[0035] Figure 2-Figure 3 A schematic diagram of corona aging of a cylindrical electrode, a polymer sample and a disk electrode in the AC corona aging experimental device provided by the present invention;

[0036] Figure 4 A schematic diagram showing the effect of the diameter of concentric circles on the electric field strength in the AC corona aging experimental device provided by the present invention;

[0037] Figure 5 A schematic diagram of the electric field simulation results of the lower surface of each cylindrical electrode after optimization in the multi-rod plate electrode structure optimization method provided by the present invention;

[0038] Figure 6 This is the actual picture of epoxy resin after corona aging;

[0039] Figure 7 This is a flow chart of the multi-rod plate electrode structure optimization method provided by the present invention.

[0040] Among them: 1. AC high voltage source; 2. Protection resistor; 3. Cabinet bushing; 4. Container; 5. High voltage lead; 6. Voltage equalizing cover; 7. Cylindrical electrode; 8. Polymer sample; 9. Disc electrode; 10. Grounding wire; 11. Bracket. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Since there are inevitably air gaps in power equipment (switch cabinets and generators, etc.), when the electric field strength is large enough, the air will be ionized to form corona, so the problem of corona discharge is difficult to avoid. When corona occurs, the high-energy electrons and ions generated by the discharge will interact with the insulating material, causing the insulation performance of the insulating material to deteriorate. This change may not be easy to detect in the short term, but it will increase the risk of equipment failure over a long period of time, especially in areas with high air humidity. In a high humidity environment, corona discharge will also generate corrosive gases such as nitric acid and ozone, which will further accelerate the degradation process of the material and seriously affect the long-term operation and maintenance of the equipment. In order to evaluate the corona resistance of the insulating material in actual operation, that is, long-term reliability, it is necessary to conduct corona aging tests. By simulating the corona discharge conditions in actual operation, the material degradation process can be accelerated, so that the aging characteristics of the material can be evaluated in a shorter time, which is crucial for the design and selection of insulating materials suitable for specific environmental conditions.

[0048] At present, corona aging tests of polymer materials are often carried out through a needle-plate electrode structure. At the same time, in order to increase the corona aging area, researchers have increased the number of needle electrodes. However, since the length and position of the needle electrode will affect the electric field strength at the needle tip, the degree of degradation of each aging area of ​​the material is different, such as publication numbers CN 103278752A and CN 109188228A, resulting in uneven electric field strength and inconsistent degradation degrees in each aging area of ​​the material.

[0049] In order to solve the above technical defects, the inventor provides an AC corona aging experimental device and a multi-rod plate electrode structure optimization method.

[0050] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0051] like Figure 1-Figure 3As shown, in the first aspect of the embodiment of the present invention, an AC corona aging experimental device is provided, which includes a container 4, a bracket 11 is provided in the container 4, and the bracket 11 is a structure with one end open and the other end blocked. The pressure equalizing hood 6, the polymer sample 8 and the disc electrode 9 are all arranged in the open end of the bracket 11, and the top outer side of the pressure equalizing hood 6 contacts the inner side of the open end of the bracket 11 to block the opening; the blocked end of the bracket 11 provides a stable support foundation, so that the pressure equalizing hood 6, the polymer sample 8 and the disc electrode 9 can maintain a relatively stable position during installation and use, and are not prone to shaking or displacement. A cylindrical electrode 7 is provided at the bottom of the pressure equalizing hood 6. In one embodiment, the cylindrical electrode 7 is made of 309 corrosion-resistant stainless steel, and in another embodiment, the cylindrical electrode 7 is made of 310 corrosion-resistant stainless steel. There are multiple cylindrical electrodes 7, one of which is arranged at the bottom center of the voltage-equalizing cover 6, and the other multiple cylindrical electrodes 7 are distributed around the bottom center of the voltage-equalizing cover 6 at an equally divided angle, and the equally divided angle is three hundred and sixty degrees / number of electrodes; secondly, a polymer sample 8 is provided on the top of the disk electrode 9, and the polymer sample 8 is located below the cylindrical electrode 7. Distributing the multiple cylindrical electrodes 7 at the bottom of the voltage-equalizing cover 6 helps to form a more uniform and stable electric field above the polymer sample 8. The central cylindrical electrode 7 works together with the surrounding equally distributed cylindrical electrodes 7 to reduce the unevenness and distortion in the electric field, so that the electric field applied to the polymer sample 8 is closer to the ideal state, thereby improving the accuracy and reliability of the experimental results. Further, a high-voltage lead 5 is installed on the top of the voltage-equalizing cover 6, and the end of the high-voltage lead 5 extends to the outside of the container 4 and is connected to a protective resistor 2, and an AC high-voltage source 1 is connected to the protective resistor 2, and the AC high-voltage source 1 is used for grounding; a grounding wire 10 is connected to the bottom of the disc electrode 9, and the other end of the grounding wire 10 extends to the outside of the container 4 and is connected to the AC high-voltage source 1. The high-voltage lead 5 is connected to the AC high-voltage source 1 through the protective resistor 2. The addition of the protective resistor 2 plays an important role in current limiting protection in the experiment. When a short circuit or fault occurs, the protective resistor 2 can effectively limit the current, prevent equipment damage or experimental accidents, and protect the safety of experimental personnel and equipment. Secondly, the high-voltage lead 5 and the grounding wire 10 both extend to the outside of the container 4, so that the experimenter can easily connect and operate outside, without frequently entering the experimental area where there may be high voltage risks, which improves the convenience and safety of experimental operation.

[0052] like Figure 2 and Figure 3As shown, the diameter of the concentric circles formed between the other multiple cylindrical electrodes 7 is smaller than the diameter of the voltage-equalizing cover 6. Since the diameter of the concentric circles is smaller than the diameter of the voltage-equalizing cover 6, the cylindrical electrodes 7 are more compactly distributed at the bottom of the voltage-equalizing cover 6, forming a relatively concentrated electric field region above the polymer sample 8. The electric field concentration effect can make the polymer sample 8 experience a stronger corona effect in a specific area, thereby accelerating the aging process and shortening the experimental time. In addition, when multiple cylindrical electrodes 7 are closely arranged in a concentric circle manner, the gap between them is reduced, reducing the diffusion and distortion of the electric field in the edge area, which helps to reduce the impact of the edge effect on the experimental results, making the electric field distribution more uniform and stable, and improving the accuracy of the experimental results. Figure 2 As shown, the diameter of the cylindrical electrode 7 is 6 mm, the lead angle is 1 mm, and the length of the cylindrical electrode 7 can be adjusted according to experimental requirements. The adjustment range of the length of the cylindrical electrode 7 is between 10 and 50 mm. Correspondingly, the diameter of the concentric circles can also be adjusted within the adjustment range of 6 to 30 mm.

[0053] The guide angle design of the cylindrical electrode 7 can reduce the sharpness of the electrode edge, thereby reducing the possibility of tip discharge. Secondly, the circumferential diameter of the disk electrode 9 is smaller than the circumferential diameter of the polymer sample 8, and the circumferential diameter of the disk electrode 9 is larger than the circumferential diameter of the equalizing cover 6. The circumferential diameter of the disk electrode 9 is smaller than the circumferential diameter of the polymer sample 8, and the edge of the polymer sample 8 will not be directly affected by the strong electric field generated by the disk electrode 9, so that the distribution of the electric field on the polymer sample 8 is more uniform, thereby more accurately simulating the corona aging environment in practical applications. At the same time, since the circumferential diameter of the disk electrode 9 is larger than the circumferential diameter of the equalizing cover 6, the disk electrode 9 can be partially covered on the equalizing cover 6, which protects the disk electrode 9 from direct influence of the external environment to a certain extent. In this embodiment, the container 4 is preferably a constant temperature and humidity chamber, which can accurately control the temperature and humidity conditions during the experiment, eliminate the interference of environmental factors on the experimental results, and improve the accuracy and reliability of the experimental results. In this embodiment, the bracket 11 is preferably a nylon bracket, which can effectively isolate the current in the high-voltage corona aging experiment and prevent the current from flowing to an unexpected path through the bracket 11. In this embodiment, a cabinet bushing 3 is provided on the outside of the container 4, and the high-voltage lead 5 and the grounding wire 10 are both connected to the AC high-voltage source 1 through the cabinet bushing 3. The cabinet bushing 3 provides a safe passage for the high-voltage lead 5 and the grounding wire 10, preventing these lines from being worn, squeezed or damaged when passing through the container 4, ensuring the stability and safety of current transmission during the experiment, and reducing the risk of experimental interruption or equipment damage due to line failure.

[0054] In a second aspect, an embodiment of the present invention provides a method for optimizing a multi-rod plate electrode structure, such as Figure 7 As shown, including:

[0055] S101, constructing a multi-rod plate electrode geometric model; illustratively, constructing a multi-rod plate electrode geometric model in a simulation software, wherein the number of rod electrodes is 7, and except for the central electrode, the remaining electrodes are distributed on concentric circles at an angle of 60°.

[0056] S102. Utilize the constructed multi-rod plate electrode geometric model to preset the spacing between the cylindrical electrode and the top of the polymer sample; illustratively, the length of the cylindrical electrode 7 can be adjusted according to experimental requirements, and the adjustment range of the length of the cylindrical electrode 7 is between 10 and 50 mm. Correspondingly, the diameter of the concentric circles can also be adjusted, and the adjustment range is between 6 and 30 mm. Specifically, a fixed value is selected within the range of 2 to 5 mm as the spacing between the multiple cylindrical electrodes 7 and the top of the polymer sample 8, wherein the preset distance between the multiple cylindrical electrodes 7 and the surface of the polymer sample 8 (epoxy resin sample) is 3 mm, the applied AC effective voltage is 6 kV, and the electrode length is assumed to be 10 mm. The concentric circle diameter is subjected to parametric scanning electric field simulation, and the concentric circle diameter is optimized to be 21 mm with the electric field uniformity as the goal. The optimization results are as follows: Figure 4 shown.

[0057] S103, determine the length of the cylindrical electrode, perform electric field simulation on the concentric circle diameter scanning within a preset range, and determine the concentric circle diameter; illustratively, select a value within the range of 10 to 50 mm to set as the length of multiple cylindrical electrodes 7, perform parameterized scanning electric field simulation on the concentric circle diameter within the range of 6 to 30 mm, and determine the concentric circle diameter with min(|E1-E2|) as the optimization target, where E1 is the average value of the maximum electric field strength under the concentric circle electrodes, and E2 is the maximum electric field strength under the central cylindrical electrode; in specific operation, based on the concentric circle diameter of 21 mm, perform parameterized scanning electric field simulation on the length of the cylindrical electrode 7, and find that the length of the cylindrical electrode 7 will only affect the magnitude of the field strength but not the uniformity. Considering the processing cost, it is finally determined to be 10 mm. At this time, the maximum electric field strength under each rod electrode is basically the same, and all exceed the breakdown field strength of air (3 kV / mm). Figure 5 shown.

[0058] S104. Based on the determined concentric circle diameter, the length of the cylindrical electrode is re-determined; illustratively, after determining the concentric circle diameter, a parameterized scanning electric field simulation is performed on the lengths of multiple cylindrical electrodes 7 in the range of 10 to 50 mm, and the lengths of multiple cylindrical electrodes 7 are re-determined in the above manner; secondly, the processed cylindrical electrode 7 is fixed on the nylon bracket 11, the surface of the polymer sample 8 is wiped with anhydrous ethanol, and then it is placed between the multi-rod-plate electrodes, and the high-voltage lead 5 and the grounding wire 10 are connected; finally, the temperature and humidity of the constant temperature and humidity chamber panel are set, wherein the temperature is 30°C and the humidity is 80%, the chamber door is closed, the AC voltage is increased to 6 kV, and after corona aging for 194 hours, the polymer sample 8 (epoxy resin sample) is as follows Figure 6 shown.

[0059] In summary, the AC corona aging experimental device and multi-rod plate electrode structure optimization method provided by the embodiment of the present invention can realize AC corona aging of polymer insulating materials, and at the same time, the multi-rod plate electrode structure is obtained through electric field optimization design, which provides a basis for analyzing the electrical corrosion resistance of materials. The electrode structure improves the uniformity of the electric field, increases the area of ​​corona corrosion, and makes the degree of material degradation basically consistent, reducing the impact of uneven discharge on the evaluation of the material's corona resistance performance. In addition, multiple samples can be obtained for analysis and testing through one experiment, reducing the number of samples required for the experiment and speeding up the process of researchers evaluating the corona resistance performance of insulating materials.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. An AC corona aging test device, It is characterized in that include: A container (4) having a support (11) disposed therein; A pressure-equalizing cover (6) and a disk electrode (9) are arranged on the support (11), and a cylindrical electrode (7) is arranged at the bottom of the pressure-equalizing cover (6), and a polymer sample (8) is arranged on the top of the disk electrode (9), and the polymer sample (8) is located below the cylindrical electrode (7); A high-voltage lead (5), one end of which is connected to the top of the voltage-equalizing cover (6), and the other end of which extends to the outside of the container (4) and is connected to a protective resistor (2), the protective resistor (2) being connected to an AC high-voltage source (1), one end of which is used to provide high voltage, and the other end of which is used to be grounded; A grounding wire (10) has one end connected to the disk electrode (9) and the other end extending to the outside of the container (4) to be connected to the AC high voltage source (1).

2. The device according to claim 1, It is characterized in that A plurality of cylindrical electrodes (7) are provided, one of which is arranged at the bottom center of the voltage-equalizing cover (6), and the other plurality of cylindrical electrodes (7) are distributed around the bottom center of the voltage-equalizing cover (6) at equally spaced angles.

3. The device according to claim 2, It is characterized in that The diameter of the concentric circles formed between the other plurality of cylindrical electrodes (7) is smaller than the diameter of the pressure equalizing cover (6).

4. The device according to any one of claims 1 to 3, It is characterized in that The diameter of the cylindrical electrode (7) is 6 mm, and the lead angle is 1 mm.

5. The device according to claim 1, It is characterized in that The circumferential diameter of the disk electrode (9) is smaller than the circumferential diameter of the polymer sample (8), and the circumferential diameter of the disk electrode (9) is larger than the circumferential diameter of the pressure equalizing cover (6).

6. The device according to claim 1, It is characterized in that The container (4) is a constant temperature and humidity chamber.

7. The device according to claim 1, It is characterized in that The support (11) is a structure with one end open and the other end closed, and the pressure equalizing cover (6), the polymer sample (8) and the disk electrode (9) are all arranged in the open end of the support (11).

8. The device according to claim 1, It is characterized in that The bracket (11) is a nylon bracket.

9. The device according to claim 1, It is characterized in that A cabinet bushing (3) is provided on the outer side of the housing (4), and the high-voltage lead (5) and the grounding wire (10) are both passed through the cabinet bushing (3) to be connected to the AC high-voltage source (1).

10. A method for optimizing the structure of a multi-rod plate electrode. It is characterized in that include: Construct a geometric model of a multi-rod plate electrode; Using the constructed multi-rod plate electrode geometric model, a distance between the cylindrical electrode and the top of the polymer sample is preset; Determine the length of the cylindrical electrode, perform electric field simulation on the concentric circle diameter scanning within a preset range, and determine the concentric circle diameter; Based on the determined concentric circle diameter, the length of the cylindrical electrode is re-determined.

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