Solid insulation sample sheet resistivity temperature characteristic multi-stage partial pressure testing device

Abstract

The invention provides a multi-stage partial pressure testing device for resistivity and temperature characteristics of a solid insulation sample wafer. The device comprises a base, at least two stages of series-connection partial pressure testing assemblies and a heating assembly, wherein the at least two stages of series voltage division test assemblies are sequentially stacked on the base, are connected in series and are connected with a high-voltage direct-current power supply module; each stage of series voltage-dividing test assembly is connected with a heating assembly; each series voltage division test assembly is connected in parallel with a gap breakdown assembly. According to the invention, the at least two stages of series voltage-dividing test assemblies are connected in series, so that the solid insulation sample wafers can be respectively clamped, the plurality of solid insulation sample wafers can be connected in series, and the series voltage-dividing test assemblies can be respectively heated; through the gap breakdown assembly connected in parallel with each stage of series voltage division test assembly, the voltage division ratio of the plurality of solid insulation sample wafers clamped by each stage of series voltage division test assembly is determined, and then the voltage division ratio of the plurality of solid insulation sample wafers is determined, namely the resistivity ratio.

Description

Technical Field

[0001] This invention relates to the field of electrical parameter testing technology for solid insulating materials, and more specifically, to a multi-stage voltage divider testing device for the resistivity temperature characteristics of solid insulating samples. Background Technology

[0002] Solid insulating materials typically possess excellent dielectric properties, mechanical strength, and ductility, playing a crucial role in the insulation of electrical equipment. Examples include glass, ceramics, and silicone rubber for outdoor insulator strings; cross-linked polyethylene (XLPE) for power cable insulation; mica for motor rotor insulation; and polypropylene film for capacitor insulation layers. Sometimes, solid insulating materials are used in combination with other materials to form composite insulation structures. Typical applications include epoxy resin impregnated paper (ERIP) for dry-type bushing capacitor cores and Al₂O₃-doped epoxy resin (ER) for pot insulators in gas-insulated switchgear (GIS). Resistivity is an important parameter characterizing insulation performance. Since different equipment and even the same equipment operating under different conditions have varying temperatures, studying the temperature characteristics of the resistivity of various solid insulation materials is crucial.

[0003] High-voltage bushings are key components of power equipment, primarily functioning to isolate high-potential conductors from the grounding shield (equipment casing or wall) and to introduce or remove high voltage and current. Currently, epoxy-impregnated paper high-voltage bushings are considered the mainstream direction for future bushings due to their oil-free, explosion-proof, low partial discharge level, and excellent mechanical properties. Epoxy-impregnated paper materials are commonly used in bushings. Researching the resistivity testing technology of epoxy-impregnated paper materials and obtaining their temperature resistivity characteristics can be used to calculate the DC electric field distribution inside the epoxy-impregnated paper capacitor core at different temperatures, forming an important foundation for dry-type bushing insulation design research.

[0004] Currently, the commonly used methods for measuring high resistance are the direct method and the comparative method. The direct method involves measuring the DC voltage applied to the sample and the current flowing through it to determine the sample's resistance. The direct method mainly includes the galvanometer method and the DC amplification method (i.e., the high-resistivity meter method); the comparative method mainly includes the galvanometer method and the bridge method. However, due to limitations in laboratory conditions, conducting research using the insulation of actual engineering power equipment, such as the core of a paper-impregnated capacitor, presents certain difficulties. Furthermore, conventional resistivity testing methods cannot meet the requirements of high-voltage and variable-temperature tests. Summary of the Invention

[0005] In view of this, the present invention proposes a multi-stage voltage divider test device for the resistivity temperature characteristics of solid insulation samples, which aims to solve the problem that the existing resistivity test methods for power equipment insulation cannot meet the requirements of high-voltage variable temperature tests.

[0006] This invention proposes a multi-stage voltage divider testing device for the resistivity-temperature characteristics of solid insulation samples. The device includes: a base, at least two stages of series voltage divider testing components, and a heating component. The at least two stages of series voltage divider testing components are stacked sequentially on the base, connected in series, and connected to a high-voltage DC power supply module. Each stage of the series voltage divider testing component is used to clamp solid insulation samples of the same specification, enabling series voltage division of each sample. Each stage of the series voltage divider testing component is connected to a heating component for heating the clamped solid insulation samples. Heated to different test temperatures; each of the series voltage divider test components has a gap breakdown component connected in parallel. The gap breakdown component is used to adjust the air gap distance, and in conjunction with the high voltage DC power supply module, the DC high voltage provided is adjusted until the air gap is broken down. Based on the breakdown gap distance and the breakdown voltage-gap distance curve of the gap breakdown component, the breakdown discharge voltage is determined, and then the voltage of the solid insulation sample clamped by the series voltage divider test components connected in parallel is determined. Based on the voltage of the solid insulation sample clamped by each series voltage divider test component, the voltage division ratio of the solid insulation sample at different temperatures is determined to obtain the resistivity temperature characteristics of the solid insulation sample.

[0007] Furthermore, in the aforementioned multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples, the series voltage divider test component includes: a test sealed cavity, a first cavity electrode, and a second cavity electrode; wherein, the test sealed cavity is used to fill with insulating gas to provide an insulating working environment for the solid insulation sample; the first cavity electrode and the second cavity electrode are arranged at intervals along the axial direction of the test sealed cavity, and the first cavity electrode and / or the second cavity electrode are positioned on the test sealed cavity in a position-adjustable manner along the axial direction of the test sealed cavity, for clamping the solid insulation sample installed in the test sealed cavity and realizing the series connection of the solid insulation sample; the interiors of the first cavity electrode and the second cavity electrode are both hollow, for injecting a heating medium to heat the first cavity electrode and the second cavity electrode, thereby heating the clamped solid insulation sample through the first cavity electrode and the second cavity electrode to achieve temperature regulation of the solid insulation sample.

[0008] Furthermore, in the above-mentioned multi-stage voltage divider test device for resistivity temperature characteristics of solid insulation sample, the first cavity electrode is provided with a first injection port and a first discharge port, and the second cavity electrode is provided with a second injection port and a second discharge port. The second injection port is connected to the first discharge port and is used to heat the first cavity electrode and the second cavity electrode sequentially by injecting external heating medium so that the first cavity electrode and the second cavity electrode are heated to the same temperature.

[0009] Furthermore, in the aforementioned multi-stage voltage divider test device for resistivity temperature characteristics of solid insulation samples, the heating component is provided with several oil storage chambers corresponding one-to-one with the series voltage divider test component. Each oil storage chamber is connected to a heater for heating the heating medium inside the oil storage chamber. Each oil storage chamber is provided with an oil outlet and an oil return port. The first injection port is connected to the oil outlet of the oil storage chamber corresponding to the series voltage divider test component, and the second discharge port is connected to the oil return port of the oil storage chamber corresponding to the series voltage divider test component.

[0010] Furthermore, in the above-mentioned multi-stage voltage divider test device for resistivity temperature characteristics of solid insulation sample, a support cylinder is also provided on one side of the test sealed cavity to support the test sealed cavity.

[0011] Furthermore, in the above-mentioned multi-stage voltage divider test device for resistivity temperature characteristics of solid insulation sample, the outer periphery of the test sealed cavity and / or the support cylinder is provided with a voltage equalization shielding ring.

[0012] Furthermore, in the aforementioned multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples, each of the gap breakdown components includes: a first test electrode; and a second test electrode. The second test electrode is positioned on one side of the first test electrode and is used to adjust the gap distance between the first test electrode and the second test electrode to calibrate the breakdown voltage-gap distance curve of the gap breakdown component. It can also obtain the breakdown gap distance when the air gap between the first test electrode and the second test electrode breaks down based on the breakdown voltage test, thereby determining the breakdown discharge voltage based on the breakdown gap distance and the breakdown voltage-gap distance curve of the gap breakdown component.

[0013] Furthermore, in the aforementioned multi-stage voltage divider test device for the resistivity temperature characteristics of solid insulation samples, each of the series voltage divider test components is provided with two parallel and spaced conductive mounting arms, which are electrically connected to the first cavity electrode and the second cavity electrode of the series voltage divider test component, respectively; the first test electrode and the second test electrode are respectively mounted on the two conductive mounting arms and electrically connected to the conductive mounting arms; the first test electrode is positioned adjustable on each of the conductive mounting arms, and / or the second test electrode is positioned adjustable on the conductive mounting arms, for adjusting the air gap distance between the first test electrode and the second test electrode.

[0014] Furthermore, in the above-mentioned multi-stage voltage divider test device for resistivity temperature characteristics of solid insulation sample, an insulating fixing arm is provided between the two conductive mounting arms, with its two ends respectively connected to the two conductive mounting arms.

[0015] Furthermore, in the aforementioned multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples, the base is electrically connected to the low-voltage side of the lowest-level series voltage divider test assembly, and the base is grounded.

[0016] The multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples provided by this invention uses at least two stages of series-connected voltage divider test components to clamp solid insulation samples, allowing multiple solid insulation samples to be connected in series. Each stage of the series voltage divider test component is connected to an oil circulation heating component to heat the component separately, thereby heating the clamped solid insulation samples and ensuring each sample is at a different temperature. By using a gap breakdown component connected in parallel to each stage of the series voltage divider test components, the voltage division ratio of the multiple solid insulation samples clamped by each stage is determined, thus establishing that the voltage division ratio of the multiple solid insulation samples is the resistivity ratio. This allows for the testing and acquisition of the resistivity-temperature characteristics of different solid insulation materials, solving the problem that existing resistivity testing methods for power equipment insulation cannot meet the requirements of high-voltage variable-temperature testing. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of the multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples provided in an embodiment of the present invention; Figure 2 This is a front view of the multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples provided in an embodiment of the present invention; Figure 3 This is a side view of the multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples provided in an embodiment of the present invention; Figure 4 This is a top view of the multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the bipolar series connection structure in the multi-stage voltage divider test device for the resistivity temperature characteristics of solid insulation samples provided in this embodiment of the invention. Figure 6 This is a schematic diagram of the three-electrode series structure in the multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples provided in an embodiment of the present invention. Figure 7 This is a front view of the series voltage divider test assembly and the gap breakdown assembly provided in an embodiment of the present invention; Figure 8 A side view of the single-stage series voltage divider test assembly and the gap breakdown assembly provided in an embodiment of the present invention; Figure 9 for Figure 8 Sectional view at point AA; Figure 10 This is a schematic diagram of the structure of the oil circulation heating assembly provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of another orientation of the oil circulation heating assembly provided in an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1-Base, 2-Series voltage divider test assembly, 21-Test sealed cavity, 211-Cylinder structure, 212-Top cover, 2121-Inflation port, 213-Bottom cover, 22-First cavity electrode, 23-Second cavity electrode, 24-Support cylinder, 241-Operating hand hole, 25-Equalizing shielding ring, 3-Gap breakdown assembly, 31-First test electrode, 32-Second test electrode, 33-Conductive mounting arm, 34-Insulating fixing arm, 4-High voltage DC power supply module, 5-Oil circulation heating assembly, 51-Oil storage cavity, 52-Oil outlet, 53-Oil return hole, 54-Touch screen control panel, 55-Heat dissipation hole, 6-Solid insulation sample, 601-First solid insulation sample, 602-Second solid insulation sample, 603-Third solid insulation sample, 604-Fourth solid insulation sample, 605-Fifth solid insulation sample. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] See Figures 1 to 6 The figure illustrates a preferred structure of the multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples provided in an embodiment of the present invention. As shown in the figure, the device includes: a base 1, at least two-stage series voltage divider test components 2, a high-voltage DC power supply module 4, and an oil circulation heating component 5.

[0020] At least two series voltage divider test components 2 are stacked sequentially on the base 1. The at least two series voltage divider test components 2 are connected in series and connected to a high voltage DC power supply module 4. The series voltage divider test components 2 are used to clamp the solid insulation sample 6 respectively so that each solid insulation sample 6 can be subjected to series voltage division.

[0021] Specifically, the base 1 provides support and fixation. At least two series-connected voltage divider test components 2 are stacked vertically on the base 1 to clamp multiple solid insulating samples 6. Each series-connected voltage divider test component 2 can clamp one solid insulating sample 6, achieving series connection of multiple solid insulating samples 6 of the same specification. The at least two series-connected voltage divider test components 2 are connected in series. The lowest voltage side is electrically connected to the base 1, which is grounded. The highest voltage side can be connected to a high-voltage DC power supply module 4 via an armored shielded wire. This allows the high-voltage DC power supply module 4 to provide DC high voltage to the multiple series-connected solid insulating samples 6, enabling series voltage division. The solid insulating samples 6 act as resistors, and their resistivity varies at different temperatures. Even solid insulating samples of the same specification have different resistances at different temperatures. Since multiple solid insulating samples 6 are connected in series, the current in each sample is the same. The voltage division ratio of the multiple solid insulating samples 6 is the ratio of their resistances, which is also the ratio of their resistivity. Among them, the solid insulation sample 6 clamped by the series voltage divider test components 2 at each level can be of uniform specifications, i.e., the size, etc., and its temperature resistivity characteristics can be determined by different temperatures. Other parameters can also be adjusted as variables to detect other variables.

[0022] Each series voltage divider test assembly 2 is connected to an oil circulation heating assembly 5, which is used to heat the series voltage divider test assembly 2 separately, so that the solid insulation sample 6 clamped by each series voltage divider test assembly 2 is heated to different test temperatures, thereby obtaining the voltage division ratio of the solid insulation sample 6 of the same specification at different temperatures.

[0023] Specifically, each series voltage divider test assembly 2 is connected to an oil circulation heating assembly 5, which can heat each stage of the series voltage divider test assembly 2 separately. This heats the solid insulation sample 6 clamped within the test assembly 2, allowing the multiple series-connected solid insulation samples 6 to be at different temperatures. This enables the determination of the voltage division ratio of solid insulation samples 6 of the same specification at different temperatures, and based on this, the resistivity ratio of solid insulation samples 6 at different temperatures can be determined, thus obtaining the degree of resistivity change at different temperatures, and consequently, the resistivity-temperature characteristics of the solid insulation sample 6. The oil circulation heating assembly 5 serves to control the temperature and should be placed at a sufficiently safe distance from other components to prevent electric shock.

[0024] Each series voltage divider test assembly 2 has a gap breakdown assembly 3 connected in parallel. The gap breakdown assembly 3 is used to adjust the air gap distance and, in conjunction with the high voltage DC power supply module 4, adjusts the DC high voltage provided until the air gap is broken down. Based on the breakdown gap distance and the breakdown voltage-gap distance curve of the gap breakdown assembly 3, the breakdown discharge voltage is determined, and then the voltage of the solid insulation sample 6 clamped by the series voltage divider test assembly 2 connected in parallel is determined. Based on the voltage of the solid insulation sample clamped by each series voltage divider test assembly 2, the voltage division ratio of the solid insulation sample 6 at different temperatures is determined to obtain the resistivity temperature characteristics of the solid insulation sample 6.

[0025] Specifically, each series voltage divider test assembly 2 is connected in parallel with a gap breakdown assembly 3. The gap breakdown assembly 3 is used to perform air gap discharge tests. By adjusting the air gap distance of the gap breakdown assembly 3 and the DC high voltage provided by the high-voltage DC power supply module 4, the air gap is broken down. Using the breakdown voltage-gap distance curve of the gap breakdown assembly 3, combined with the breakdown air gap, the breakdown discharge voltage is determined, which is the voltage division of the solid insulation sample 6 clamped by the series voltage divider test assembly 2 connected in parallel with the gap breakdown assembly 3. Then, the ratio between the voltage division value of the solid insulation sample 6 and the DC high voltage provided by the high-voltage DC power supply module 4 is determined, which is the voltage division ratio of the solid insulation sample 6. In this embodiment, the gap breakdown assembly 3 can be uniformly arranged along the circumference of the series voltage divider test assembly 2. For example, adjacent gap breakdown assemblies 3 should be uniformly spaced at (360 / n)° in a clockwise or counterclockwise order to ensure safety, where n is the number of stages of the series voltage divider test assembly 2. The gap breakdown assembly 3 is connected in parallel between the two series voltage divider test assemblies 2, i.e., on the solid insulating sample clamped by the series voltage divider test assemblies 2. It is used to measure the voltage divider voltage on the solid insulating sample 6. The voltage can be measured by discharge. Based on the air gap during breakdown, the corresponding breakdown discharge voltage is obtained to obtain the voltage divider voltage on the solid insulating sample 6. By using the gap measurement method, the measurement uncertainty can be guaranteed while avoiding the use of a multi-stage voltage divider structure, simplifying the experimental circuit, optimizing the experimental process, and saving experimental space.

[0026] In this embodiment, if there are two series voltage divider test components 2, then there are two solid insulation samples 6 for series testing. Once the voltage division ratio of one solid insulation sample 6 is determined, the voltage division ratio of the other can be determined, thereby determining the voltage division ratio of the solid insulation sample 6 at two different temperatures, i.e., the ratio of the voltage division ratio of the solid insulation sample 6 at two different temperatures. The two solid insulation samples 6 are then placed at two other temperatures, and the above air gap discharge test is repeated to determine the voltage division ratio of the solid insulation sample 6 at those two different temperatures, thus obtaining the resistivity temperature characteristics of the solid insulation sample 6. Each gap breakdown component 3 can have the same structure, and its breakdown voltage-gap distance curve is the same. The breakdown voltage-gap distance curve of the gap breakdown component 3 can be pre-calibrated using this device. Calibration can be performed by adjusting the air gap of one of the gap breakdown components 3 and the total voltage applied to the device to determine the breakdown voltage-gap distance curve of the gap breakdown component 3. Other calibration methods can also be used, and this embodiment does not impose any limitations on them. Of course, the breakdown voltage-gap distance curve of each gap breakdown component 3 can also be calibrated individually.

[0027] like Figure 5 As shown, the solid insulating sample at the first temperature is the first solid insulating sample 601, and its first resistive voltage division value is U. 11 The solid insulating sample at the second temperature is the second solid insulating sample 602, and its second resistance voltage divider value is U. 21 Among them, the first solid insulating sample 601 and the second solid insulating sample 602 are connected in series, that is, U 11 and U 21 The sum of these values ​​constitutes the first total voltage U provided by the high-voltage DC power supply module 4. 01 If the first temperature is lower than the second temperature, the gap of the parallel gap breakdown assembly 3 of the first solid insulation sample 601 is reduced, and the DC high voltage provided by the high voltage DC power supply module 4 is increased, until the air gap at the parallel gap breakdown assembly 3 of the first solid insulation sample 601 is broken down. The breakdown gap distance of the parallel gap breakdown assembly 3 of the first solid insulation sample 601 is determined. According to the breakdown voltage-gap distance curve of the gap breakdown assembly 3, the breakdown discharge voltage is determined, which is the voltage division value of the first solid insulation sample 601, to determine U. 11 with U 01 The ratio between them is the voltage division ratio of the first solid insulation sample 601, and the voltage division ratio of the second solid insulation sample 602 is... Then the voltage division ratio and resistivity ratio of the first solid insulating sample 601 and the second solid insulating sample 602 are both The resistivity-temperature characteristics of the solid insulating sample can be obtained by continuing to test after adjusting the temperature, and obtaining the resistivity ratio at multiple temperatures through multiple tests.

[0028] Of course, if there are three series voltage divider test components 2, then there are three solid insulation samples for series testing. The voltage division ratio of one of the solid insulation samples is determined. By adjusting the air gap of the parallel breakdown component 3 of the solid insulation sample with the determined voltage division ratio, the above air gap discharge test is repeated on the solid insulation sample at another temperature to determine the voltage division ratio of the solid insulation sample at that temperature. That is, based on two air gap discharge tests, the voltage division ratio of the solid insulation sample at two different temperatures is determined, and then the voltage division ratio of the solid insulation sample at another temperature is determined. Thus, the voltage division ratio of the solid insulation sample at the three different temperatures is determined. The three solid insulation samples can be adjusted to three other temperatures, and the above air gap discharge test is repeated to determine the voltage division ratio of the solid insulation sample at the three different temperatures. Through multiple temperature adjustments and tests, the resistivity temperature characteristics of the solid insulation sample can be obtained.

[0029] like Figure 6 As shown, the solid insulation sample at the third temperature is the third solid insulation sample 603, and its third resistance voltage division value is U. 12 The solid insulation sample at the fourth temperature is the fourth solid insulation sample 604, and its fourth resistance voltage divider value is U. 22 The solid insulation sample at the fifth temperature is the fifth solid insulation sample 605, and its fifth resistance voltage divider value is U. 32 Among them, the third solid insulation sample 603, the fourth solid insulation sample 604, and the fifth solid insulation sample 605 are connected in series, that is, U 12 U 22 and U 32 The sum of these values ​​provides the second total voltage U, which is the DC high voltage supplied by the high-voltage DC power supply module 4. 02 The third temperature is lower than the fourth temperature and both are lower than the fifth temperature. By reducing the gap of the parallel gap breakdown assembly 3 of the third solid insulation sample 603 and increasing the DC high voltage provided by the high voltage DC power supply module 4, the air gap at the parallel gap breakdown assembly 3 of the third solid insulation sample 603 is broken down. The breakdown gap distance of the parallel gap breakdown assembly 3 of the third solid insulation sample 603 is determined. According to the breakdown voltage-gap distance curve of the gap breakdown assembly 3, the breakdown discharge voltage is determined, which is the voltage division value of the third solid insulation sample 603, i.e., U. 12 This determines the voltage division ratio of the third solid insulating sample 603 in the total circuit, which is U. 12 with U 02The ratio between them; increase the gap of the parallel gap breakdown assembly 3 of the third solid insulation sample 603 so that the parallel gap breakdown assembly 3 of the third solid insulation sample 603 breaks down after the parallel gap breakdown assembly 3 of the fourth solid insulation sample 604. The gap of the parallel gap breakdown assembly 3 of the fourth solid insulation sample 604 can be decreased and the DC high voltage provided by the high voltage DC power supply module 4 can be increased until the air gap at the parallel gap breakdown assembly 3 of the fourth solid insulation sample 604 is broken down. Determine the breakdown gap distance of the parallel gap breakdown assembly 3 of the fourth solid insulation sample 604. According to the breakdown voltage-gap distance curve of the gap breakdown assembly 3, determine the breakdown discharge voltage, which is the voltage division value of the fourth solid insulation sample 604, i.e., U. 22 This determines the voltage division ratio of the fourth solid insulating sample 604 in the total circuit, which is U. 22 with U 02 The ratio between them indicates that the voltage division ratio of the fifth solid insulating sample 605 in the total circuit is... This led to the determination of the partial voltage ratio and resistivity ratio of the solid insulating sample at the third, fourth, and fifth temperatures, all of which were... The resistivity-temperature characteristics of the solid insulating sample can be obtained by continuing to test after adjusting the temperature, and obtaining the resistivity ratio at multiple temperatures through multiple tests.

[0030] For other numbers of series voltage divider test components 2, the determination can be based on two-stage or three-stage methods. For example, there can be n series voltage divider test components 2 and n gap breakdown components 3. The sum of the voltage division ratios of the solid insulation samples at n different temperatures is 1. The voltage division ratio of the solid insulation samples at n-1 different temperatures can be determined by n-1 air gap discharge tests, thereby ensuring the voltage division ratio of the solid insulation samples at n different temperatures. This process can be repeated, i.e., first adjust the temperature of each series voltage divider test component 2, and then repeatedly determine the voltage division ratio of the solid insulation samples at n different temperatures. To achieve uniformity, through multiple overall tests, such as m tests, preferably, there is a common temperature between two adjacent overall tests. For example, the temperatures of the three solid insulation samples in the previous test were 10℃, 20℃, and 30℃, the temperatures of the three solid insulation samples in the current test were 30℃, 40℃, and 50℃, and the temperatures of the solid insulation samples in the next test were 50℃, 60℃, and 70℃. The voltage division ratio of the solid insulation samples at {n + (n-1) * (m-1)} different temperatures can be determined, and thus the resistivity temperature characteristics of the solid insulation samples can be obtained.

[0031] See Figures 7 to 9 The figure illustrates a preferred structure of the series voltage divider test assembly 2 provided in an embodiment of the present invention. As shown, the series voltage divider test assembly 22 includes: a test sealed cavity 21, a first cavity electrode 22, a second cavity electrode 23, a support cylinder 24, and a pressure equalization shielding ring 25.

[0032] The test sealed cavity 21 is used to fill with insulating gas to provide an insulating working environment for the solid insulating sample.

[0033] Specifically, the test sealed cavity 21 includes: a cylindrical structure 211 with openings at both ends and a hollow interior, and a top cover 212 and a bottom cover 213 disposed at the two opening ends of the cylindrical structure 211; the cylindrical structure 211 can be made of organic transparent glass, which can achieve insulation between the top cover 212 and the bottom cover 213 while allowing observation of internal operations. The top cover 212 and the bottom cover 213 are detachably connected to both ends of the cylindrical structure 211, respectively, to support the first cavity electrode 22 and the second cavity electrode 23, and to seal the internal cavity of the cylindrical structure 211, forming the test sealed cavity 21. In this embodiment, the test sealed cavity 21, especially the top cover 212 or the bottom cover 213, is provided with an inflation port 2121 for filling the test sealed cavity 21 with an insulating gas, such as SF6. The top cover 212 and the bottom cover 213 can be made of a conductive metallic material.

[0034] The first cavity electrode 22 and the second cavity electrode 23 are arranged at intervals along the axial direction of the test sealed cavity 21, and are both arranged on the test sealed cavity 21 in a position-adjustable manner along the axial direction of the test sealed cavity 21, for clamping the solid insulating sample 6 installed in the test sealed cavity 21 and realizing the series connection of the solid insulating sample 6.

[0035] Specifically, the first cavity electrode 22 and the second cavity electrode 23 are arranged at intervals along the axial direction of the test sealed cavity 21. The first cavity electrode 22 is mounted on the top cover 212 in a position-adjustable manner along the axial direction of the test sealed cavity 21, and the second cavity electrode 23 is mounted on the bottom cover 213 in a position-adjustable manner along the axial direction of the test sealed cavity 21. The spacing between the first cavity electrode 22 and the second cavity electrode 23 can be adjusted to facilitate the installation of the solid insulating sample 6 between the first cavity electrode 22 and the second cavity electrode 23. The electrode is connected to the electrode terminals of the first cavity electrode 22 and the second cavity electrode 23 (e.g., ...). Figure 9The bottom end of the first cavity electrode 22 and the top end of the second cavity electrode 23 are clamped together to ensure that the electrodes of the first cavity electrode 22 and the second cavity electrode 23 are in close contact with the solid insulating sample 6. Simultaneously, the solid insulating sample 6 clamped in the middle can be heated through the first cavity electrode 22 and the second cavity electrode 23. The electrodes of the first cavity electrode 22 and the second cavity electrode 23 may have rounded transition corners to prevent corona discharge. In this embodiment, a threaded hole may be provided on the top cover 212 and at its center position, and an external thread adapted to the threaded hole may be provided on the outer wall of the first cavity electrode 22. The two are threadedly connected so that the first cavity electrode 22 can be moved along the axial direction of the test sealing cavity 21 by rotating the first cavity electrode 22, thereby adjusting the distance between the first cavity electrode 22 and the second cavity electrode 23. Of course, the second cavity electrode 23 can also be positioned on the bottom cover 213 in a position-adjustable manner along the axial direction of the test sealing cavity 21, and the connection method between the first cavity electrode 22 and the top cover 212 can be the same, or other connection methods can be used. This embodiment does not limit any of them. In this embodiment, the first cavity electrode 22 and the second cavity electrode 23 are electrically connected to the top cover 212 and the bottom cover 213, respectively.

[0036] The first cavity electrode 22 and the second cavity electrode 23 are both hollow inside, and are used to inject a heating medium to heat the first cavity electrode 22 and the second cavity electrode 23. In turn, the first cavity electrode 22 and the second cavity electrode 23 heat the clamped solid insulating sample 6 to achieve temperature regulation of the solid insulating sample 6.

[0037] Specifically, both the first cavity electrode 22 and the second cavity electrode 23 are hollow inside, and their interiors are interconnected. They can also be connected to a heating component to inject a heating medium into the first cavity electrode 22 and the second cavity electrode 23, heating them to a set temperature. This, in turn, heats the solid insulating sample 6 sandwiched in the middle to the set temperature, thereby adjusting the temperature of the solid insulating sample 6 to different test temperatures and obtaining its resistivity temperature characteristics. In this embodiment, the first cavity electrode 22 has a first injection port and a first discharge port, and the second cavity electrode 23 has a second injection port and a second discharge port. The second injection port is connected to the first discharge port, establishing internal connectivity. The first cavity electrode 22 and the second cavity electrode 23 can be sequentially heated by injecting a heating medium, ensuring they are heated to the same temperature.

[0038] As can be seen, the first cavity electrode 22 and the second cavity electrode 23 are arranged on the test sealed cavity 21 along the axial direction of the test sealed cavity 21 in a position-adjustable manner. This allows for adjustment of the distance between the first cavity electrode 22 and the second cavity electrode 23, thereby facilitating the clamping, tight contact, and conductive connection of the solid insulating sample 6. This not only fixes the position of the sample and prevents it from slipping, but also avoids gaps between the electrodes and the sample, enabling electrical connection to apply high voltage. It also prevents partial discharge in the air gap, reducing experimental errors. At the same time, it ensures heat conduction and controls the sample temperature.

[0039] In this embodiment, one side of the test sealed cavity 21 (e.g.) Figure 9 The lower side (as shown) is also provided with a support cylinder 24 for supporting the test sealed cavity 21. Specifically, the support cylinder 24 can be made of metal and can be electrically connected to the bottom cover 213 of the current series voltage divider test assembly 2 and the top cover 212 of the next series voltage divider test assembly 2, realizing the conductive connection between the second cavity electrode 23 of the current series voltage divider test assembly 2 and the first cavity electrode 22 of the next series voltage divider test assembly 2, so that the two are at the same potential, thereby realizing the series connection of the multi-stage series voltage divider test assemblies 2. In this embodiment, the support cylinder 24 can be provided with an operating hand hole 241 to facilitate internal operation through the operating hand hole 241, such as inflating the internal air inlet 2121. In this embodiment, the two opposite ends of the test sealed cavity 21 and the support cylinder 24 (e.g., Figure 9 Both the top end of the test sealing cavity 21 and the bottom end of the support cylinder 24 shown can be provided with connecting flanges, that is, both the upper and lower ends of the series voltage divider test assembly 2 can be provided with connecting flanges, which are electrically connected to the first cavity electrode 22 on the test sealing cavity 21 and the support cylinder 24, respectively. The upper connecting flange can be electrically connected to the first cavity electrode 22 through the top cover 212, and the lower connecting flange can be electrically connected to the bottom cover 213 through the support cylinder 24, and then connected to the wire of the second cavity electrode 23, so as to facilitate connection with the parallel gap breakdown assembly 3. At the same time, the connection ends of two adjacent gap breakdown assemblies 3 (for example, the bottom end of the first series voltage divider test assembly 2 at the top and the top end of the second series voltage divider test assembly 2 below it) can share a connecting flange.

[0040] In this embodiment, a pressure equalization shielding ring 25 is provided on the outer periphery of the test sealing cavity 21 and / or the support cylinder 24, which can improve the electric field distribution and prevent corona discharge and local overheating. Specifically, a pressure equalization shielding ring 25 can be provided on the outer periphery of the connection between the test sealing cavity 21 and the support cylinder 24, the top end of the test sealing cavity 21 and the bottom end of the support cylinder 24, or it can be a pressure equalization shielding cover.

[0041] In this embodiment, the cylindrical structure 211 and the support cylinder 24 of the test sealing cavity 21 have different diameters and can be connected by a connecting plate. The connecting plate can be connected to both the cylindrical structure 211 and the support cylinder 24 by vertically arranged bolts. The connecting plate and the connecting ring of the equalizing shielding ring 25 can be connected by welding or by bolts, which facilitates disassembly and fixing. In this embodiment, the breakdown voltage of the gap breakdown component 3 can be measured by measuring the ball gap or the rod gap, or by other methods; no limitation is made in this embodiment. In this embodiment, the measurement is performed by measuring the ball gap.

[0042] See also Figure 7 Each gap breakdown component 3 may include: a first test electrode 31 and a second test electrode 32; wherein, the second test electrode 32 is disposed on one side of the first test electrode 31 in a position-adjustable manner, for adjusting the gap distance between the first test electrode 31 and the second test electrode 32, and based on the breakdown voltage test, the breakdown gap distance when the air gap between the first test electrode 31 and the second test electrode 32 breaks down is obtained, and the breakdown discharge voltage is determined based on the breakdown gap distance and combined with the breakdown voltage-gap distance curve of the gap breakdown component 3.

[0043] Specifically, both the first test electrode 31 and the second test electrode 32 can be ball electrode structures. The first test electrode 31 and the second test electrode 32 are coaxially arranged and are axially adjustable on one side of the series voltage divider test assembly 2, allowing for adjustment of the air gap distance. The first test electrode 31 and the second test electrode 32 can be connected in parallel to the series voltage divider test assembly 2. In particular, the first test electrode 31 and the second test electrode 32 are electrically connected to the first cavity electrode 22 and the second cavity electrode 23 of the series voltage divider test assembly 2, respectively. They can be connected in parallel to the solid insulating sample 6 clamped by the first cavity electrode 22 and the second cavity electrode 23. By adjusting the air gap distance between the first test electrode 31 and the second test electrode 32 until the air gap between the first test electrode 31 and the second test electrode 32 is broken down, ensuring the breakdown gap distance at breakdown, and then, based on the breakdown gap distance and combined with the breakdown voltage-gap distance curve of the gap breakdown assembly 3, the voltage division on the first test electrode 31 and the second test electrode 32 is determined, which is the voltage division of the solid insulating sample 6. Of course, the first test electrode 31 and the second test electrode 32 can also be used to calibrate the breakdown voltage-gap distance curve of the gap breakdown component 3. The first test electrode 31 and the second test electrode 32 can both be compatible ball electrodes, or compatible rod electrodes or other electrodes; this embodiment does not impose any limitations on them.

[0044] See also Figure 7Each series voltage divider test assembly 2 is provided with two parallel and spaced conductive mounting arms 33, which are electrically connected to the first cavity electrode 22 and the second cavity electrode 23 of the series voltage divider test assembly 2, respectively. The first test electrode 31 and the second test electrode 32 are respectively mounted on the two conductive mounting arms 33 and electrically connected to the conductive mounting arms 33. The first test electrode 31 is positioned adjustablely on each conductive mounting arm 33, and / or the second test electrode 32 is positioned adjustablely on the conductive mounting arm 33, for adjusting the air gap distance between the first test electrode 31 and the second test electrode 32.

[0045] Specifically, each of the two connecting flanges at the top and bottom of the series voltage divider test assembly 2 is provided with a conductive mounting arm 33. The end of the conductive mounting arm 33 can be fixedly connected to the connecting flange by bolts. The first test electrode 31 and the second test electrode 32 are conductively connected to the first cavity electrode 22 and the second cavity electrode 23 respectively through the conductive mounting arms 33. In this embodiment, the mounting post on the first test electrode 31 can be along the axial direction of the first test electrode 31 (e.g., ...). Figure 7 The second test electrode 32 (in the vertical direction shown) is mounted on the upper conductive mounting arm 33 in a position-adjustable manner, and the mounting post on the second test electrode 32 can be aligned along the axial direction of the first test electrode 31 (e.g., in the vertical direction shown). Figure 7 The electrode (vertically as shown) is mounted on the upper conductive mounting arm 33 in a position-adjustable manner. The mounting post is made of conductive metal, enabling both position adjustment and conductivity. Preferably, the mounting post can be threadedly connected to the conductive mounting arm 33 to adjust the distance between them by rotation. For example, the conductive mounting arm 33 has a threaded hole, and the outer wall of the mounting post has an external thread that matches the threaded hole, thereby achieving height adjustment. Position adjustment can also be achieved through other methods, such as the mounting post being slidably inserted into the conductive mounting arm 33 and clamped and fixed in place by a clamping member after adjustment. The first test electrode 31 and the second test electrode 32 are arranged in parallel.

[0046] See also Figure 7 An insulating fixing arm 34 is provided between the two conductive mounting arms 33, with its two ends connected to the two conductive mounting arms 33 respectively, for supporting and reinforcing the two conductive mounting arms 33 and preventing deformation or displacement such as tilting of the two conductive mounting arms 33. In this embodiment, there can be multiple insulating fixing arms 34, and they can be along the length direction of the first test electrode 31 and the second test electrode 32 (e.g., Figure 7 (As shown in the horizontal direction) are arranged side by side with intervals.

[0047] See Figure 10 and Figure 11The figure illustrates a preferred structure of the oil circulation heating assembly 5 provided in an embodiment of the present invention. As shown, the oil circulation heating assembly 5 has a plurality of oil storage chambers 51 corresponding one-to-one with the series pressure divider test assembly 2. Each oil storage chamber 51 is connected to a heater for heating the heating medium inside the oil storage chamber 51. Each oil storage chamber 51 is provided with an oil outlet 52 and an oil return port 53. The first injection port is connected to the oil outlet 52 of the oil storage chamber 51 corresponding to the series pressure divider test assembly 2, and the second discharge port is connected to the oil return port 53 of the oil storage chamber 51 corresponding to the series pressure divider test assembly 2.

[0048] Specifically, the oil circulation heating assembly 5 may have a heating shell containing several oil storage chambers 51, each corresponding to one of the series voltage divider test assemblies 2, for storing the heating medium. For example, if there are three series voltage divider test assemblies 2, the oil circulation heating assembly 5 will have three oil storage chambers 51, each corresponding to one of the three series voltage divider test assemblies 2, to heat the first test electrode 31 and the second test electrode 32 of each of the three series voltage divider test assemblies 2 through the internally flowing heating medium. The oil storage chambers 51 may be connected to heaters to heat the heating medium within them, thereby controlling the temperature of the heating medium and consequently controlling the test temperature of the solid insulation sample 6. In this embodiment, the heating housing is also equipped with thermocouples and a circulation pump corresponding to the oil storage chamber 51. The thermocouples detect the temperature of the heating medium in the oil storage chamber 51, and the circulation pump circulates the internal heating medium so that the heating medium in the oil storage chamber 51 can flow from the oil outlet 52 and the first injection port to the first test electrode 31, and from the first discharge port and the second injection port to the second test electrode 32, and then flow back to the oil storage chamber 51 from the second discharge port and the return oil port 53. In this embodiment, the heater can be connected to a controller, such as a PID temperature controller. The controller is also connected to the thermocouples and the circulation pump, and can control the heater based on the temperature obtained by the thermocouples until it is heated and stabilized at a preset temperature. Then, the circulation pump is controlled to pump the heating medium in the oil storage chamber 51 into the first test electrode 31 and the second test electrode 32 for circulation, thereby heating the first test electrode 31 and the second test electrode 32. The heating housing is also equipped with heat dissipation holes 55 for heat dissipation. Of course, the heating housing may be equipped with a touch screen control panel 54 for setting the preset temperature. The heating medium may be insulating oil or other media; this embodiment does not impose any limitations on it.

[0049] How to use this device: First, install the solid insulation sample under test between the first cavity electrode 22 and the second cavity electrode 23 of each series voltage divider test assembly 2. The size of the solid insulation sample under test clamped on each series voltage divider test assembly 2 should be consistent. Complete the wiring according to the high voltage test specification, ensuring that the first cavity electrode 22 and the second cavity electrode 23 of each series voltage divider test assembly 2 clamp the solid insulation sample under test, ensuring that all bolts are tightened, and inflate the test sealed cavity 21 through the inflation port 2121 to complete the inflation and safely and reliably connect the high voltage wiring.

[0050] If this is the first experiment, the breakdown voltage-gap distance curve of each gap breakdown component 3 can be calibrated individually. The calibration method is as follows: set the air gap of the remaining gap breakdown components 3 (excluding the tested gap breakdown component 3) to 0, that is, short-circuit the solid insulation samples connected in parallel with the remaining gap breakdown components 3. By setting the air gap distance between the first test electrode 31 and the second test electrode 32 of the tested gap breakdown component 3 to different values, measure the breakdown voltage at different gap distances, and then obtain the breakdown voltage-gap distance curve of the tested gap breakdown component 3, so as to obtain the breakdown voltage-gap distance curve of each gap breakdown component 3 individually.

[0051] Then, the touchscreen control panel 54 of the oil circulation heating assembly 5 is set to set the oil temperature of each series voltage divider test assembly 2. To improve experimental efficiency, the temperature of each series voltage divider test assembly 2 should be set to a different value. After setting the oil temperature, wait for the oil temperature of the first cavity electrode 22 and the second cavity electrode 23 of each series voltage divider test assembly 2 to stabilize. Next, using the first-stage gap breakdown assembly 3 as the test unit, the air gap of the first-stage gap breakdown assembly 3 connected in parallel with the topmost first-stage series voltage divider test assembly 2 is kept unchanged, while the air gaps of the other gap breakdown assemblies 3 are increased, i.e., the air gap of the first-stage gap breakdown assembly 3 is minimized, to ensure that the first-stage gap breakdown assembly 3 is broken down first during the test, and the breakdown gap distance when the first-stage gap breakdown assembly 3 breaks down is determined. In this way, the remaining gap breakdown assemblies 3 can be selected as test units in sequence, and the breakdown gap distance of the remaining gap breakdown assemblies 3 can be determined. Among them, the breakdown gap distance of each stage of the series voltage divider test assembly 2 can be determined, and the (n-1) stages of the series voltage divider test assembly 2 can also be determined; where n is the number of stages of the series voltage divider test assembly 2 and the gap breakdown assembly 3.

[0052] Finally, based on the breakdown gap distance, the voltage division of the series voltage divider test assembly 2 at this stage is determined through the calibrated breakdown voltage-gap distance curve. Then, based on the test voltage, i.e., the DC high voltage provided by the high-voltage DC power supply module 4 at breakdown, the voltage division ratio of each solid insulation sample under test at different temperatures in the series voltage divider test assembly 2 is calculated. This determines the voltage division ratio of each solid insulation sample under test at different temperatures, thus calculating the voltage division ratio of each solid insulation sample under test at different temperatures, which is the resistivity ratio. Based on this, the resistivity ratio of the samples at different temperatures can be calculated, thereby obtaining the resistivity-temperature characteristic curve, i.e., the resistivity-temperature characteristic of the solid insulation sample.

[0053] In summary, the multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples provided in this embodiment uses at least two stages of series-connected voltage divider test components 2 to clamp solid insulation samples, allowing multiple solid insulation samples to be connected in series. Each stage of the series-connected voltage divider test component 2 is connected to an oil circulation heating component 5 to heat the respective components, thereby heating the clamped solid insulation samples and ensuring each sample is at a different temperature. By using the gap breakdown components 3 connected in parallel to each stage of the series-connected voltage divider test components 2, the voltage division ratio of the multiple solid insulation samples clamped by each stage is determined, thus establishing the voltage division ratio as the resistivity ratio. This allows for the testing and acquisition of the resistivity-temperature characteristics of different solid insulation materials, solving the problem that existing resistivity testing methods for power equipment insulation cannot meet the requirements of high-voltage variable-temperature testing.

[0054] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0055] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A multi-stage voltage divider test device for the resistivity-temperature characteristics of a solid insulating sample, characterized in that, include: The system includes a base, at least two series-connected voltage divider test components, and a heating component; among which... The at least two-stage series voltage divider test components are stacked sequentially on the base. The at least two-stage series voltage divider test components are connected in series and connected to a high-voltage DC power supply module. The series voltage divider test components are used to clamp solid insulation samples of the same specification respectively, so that each solid insulation sample can be subjected to series voltage division. Each of the series voltage divider test assemblies is connected to a heating assembly for heating the series voltage divider test assembly separately, so that the solid insulation sample clamped by each of the series voltage divider test assemblies is heated to different test temperatures; Each of the series voltage divider test components has a gap breakdown component connected in parallel. The gap breakdown component is used to adjust the air gap distance and, in conjunction with the high voltage DC power supply module, adjust the DC high voltage provided until the air gap is broken down. Based on the breakdown gap distance and the breakdown voltage-gap distance curve of the gap breakdown component, the breakdown discharge voltage is determined, and then the voltage of the solid insulation sample clamped by the series voltage divider test components connected in parallel is determined. Based on the voltage of the solid insulation sample clamped by each series voltage divider test component, the voltage division ratio of the solid insulation sample at different temperatures is determined to obtain the resistivity temperature characteristics of the solid insulation sample.

2. The multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples according to claim 1, characterized in that, The series voltage divider test assembly includes: a test sealed cavity, a first cavity electrode, and a second cavity electrode; wherein... The test sealed cavity is used to fill with insulating gas to provide an insulating working environment for the solid insulating sample. The first cavity electrode and the second cavity electrode are arranged at intervals along the axial direction of the test sealed cavity, and the first cavity electrode and / or the second cavity electrode are arranged on the test sealed cavity in a position-adjustable manner along the axial direction of the test sealed cavity, for clamping the solid insulating sample installed in the test sealed cavity and realizing the series connection of the solid insulating sample; The first cavity electrode and the second cavity electrode are both hollow inside, which is used to inject a heating medium to heat the first cavity electrode and the second cavity electrode, and then heat the clamped solid insulating sample through the first cavity electrode and the second cavity electrode to adjust the temperature of the solid insulating sample.

3. The multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples according to claim 2, characterized in that, The first cavity electrode is provided with a first injection port and a first discharge port, and the second cavity electrode is provided with a second injection port and a second discharge port. The second injection port is connected to the first discharge port and is used to heat the first cavity electrode and the second cavity electrode sequentially by injecting external heating medium so that the first cavity electrode and the second cavity electrode are heated to the same temperature.

4. The multi-stage voltage divider test device for resistivity temperature characteristics of solid insulation samples according to claim 3, characterized in that, The heating assembly has several oil storage chambers that correspond one-to-one with the series voltage divider test assembly. Each oil storage chamber is connected to a heater for heating the heating medium inside the oil storage chamber. Each of the oil storage chambers is provided with an oil outlet and an oil return port. The first injection port is connected to the oil outlet of the oil storage chamber corresponding to the series pressure divider test component, and the second discharge port is connected to the oil return port of the oil storage chamber corresponding to the series pressure divider test component.

5. The multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples according to claim 2, characterized in that, A support cylinder is also provided on one side of the test sealing cavity to support the test sealing cavity.

6. The multi-stage voltage divider test device for resistivity temperature characteristics of solid insulation samples according to claim 2, characterized in that, The outer periphery of the test sealing cavity and / or the support cylinder is provided with a pressure equalization shielding ring.

7. The multi-stage voltage divider test apparatus for the resistivity temperature characteristics of solid insulation samples according to any one of claims 1 to 6, characterized in that, Each of the aforementioned gap breakdown components includes: First test electrode; The second test electrode is positioned on one side of the first test electrode in an adjustable manner. It is used to adjust the gap distance between the first and second test electrodes to calibrate the breakdown voltage-gap distance curve of the gap breakdown component. It can also obtain the breakdown gap distance when the air gap between the first and second test electrodes breaks down based on the breakdown voltage test. Therefore, based on the breakdown gap distance and the breakdown voltage-gap distance curve of the gap breakdown component, the breakdown discharge voltage can be determined.

8. The multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples according to claim 7, characterized in that, Each of the series voltage divider test components is provided with two conductive mounting arms arranged side by side and spaced apart, which are electrically connected to the first cavity electrode and the second cavity electrode of the series voltage divider test component, respectively; the first test electrode and the second test electrode are respectively mounted on the two conductive mounting arms and electrically connected to the conductive mounting arms; The first test electrode is disposed on the conductive mounting arm in a position-adjustable manner, and / or the second test electrode is disposed on the conductive mounting arm in a position-adjustable manner, for adjusting the air gap distance between the first test electrode and the second test electrode.

9. The multi-stage voltage divider test device for the resistivity-temperature characteristics of solid insulation samples according to claim 8, characterized in that, An insulating fixing arm is provided between the two conductive mounting arms, with its two ends respectively connected to the two conductive mounting arms.

10. The multi-stage voltage divider test apparatus for the resistivity temperature characteristics of solid insulation samples according to any one of claims 1 to 6, characterized in that, The base is electrically connected to the low-voltage side of the lowest-level series voltage divider test assembly, and the base is grounded.

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