A device and method for grading ac voltage withstand test of insulating tools

Abstract

The application discloses an insulation tool grading AC withstand voltage test device and method, and belongs to the technical field of electrical engineering. The device comprises a mounting frame, a test assembly, a lifting assembly, a grounding wire and a high-voltage lead. The test assembly is slidably arranged on the mounting frame and used for AC withstand voltage detection of the insulation tool. The lifting assembly is arranged on the top of the mounting frame and used for adjusting the height of the test assembly. The test assembly comprises a clamp electrode, the clamp electrode comprises an upper clamp plate and a lower clamp plate, a groove is formed in the middle of the top of the lower clamp plate, a sawtooth clamping groove is arranged on the side wall of the groove, and copper electrodes are uniformly arranged on the opposite surfaces of the upper clamp plate and the lower clamp plate. The height of the test assembly is adjusted by the lifting assembly, so that the staff can install the measured tool on the ground without climbing. The sawtooth clamping groove of the clamp electrode and the upper clamp plate are matched, so that the strip dry type tool and the flexible tool can be clamped, and the application range is wide.

Description

Technical Field

[0001] This invention belongs to the field of electrical engineering technology, specifically a graded AC withstand voltage test device and method for insulating tools. Background Technology

[0002] With the continuous progress in the construction of ultra-high voltage power grids, the voltage levels and operating conditions of power transmission and transformation equipment have been significantly improved. Compared with the past, the new smart grid demonstrates higher levels of advancement, scientific rigor, environmental friendliness, and energy efficiency. To meet the current demands of the power grid, the requirements for power transmission and transformation equipment are becoming increasingly stringent. At the same time, with the gradual increase in voltage levels, the insulation performance requirements for insulating tools and equipment are also becoming more stringent.

[0003] In the daily operation and maintenance of power systems, insulating tools such as insulating rods, voltage detectors, link bars, and insulating ropes are crucial equipment for ensuring the safety of workers. During use, the insulation performance of these tools gradually declines due to factors such as environmental humidity, mechanical wear, and aging. Therefore, regularly conducting AC withstand voltage tests on insulating tools is a key step in ensuring reliable insulation performance and protecting the safety of workers.

[0004] The current method for AC withstand voltage testing of insulating tools is as follows: Four insulated liftable supports, two sets of clamp electrodes, and a grounding device are configured. Each set of clamp electrodes is connected to the upper ends of the two insulated liftable supports via support plates. The four bases are placed in a rectangular configuration on the ground, with the distance between the two sets of clamp electrodes adjusted to 1.8m. A 500kV test transformer is configured. The height of the top of the insulating support rod from the ground is adjusted to 2.1m. The head end of the test specimen is placed sequentially in the serrated groove of the clamp electrode set to which the high-voltage lead is to be connected, and the tail end is placed sequentially in the serrated groove of the other clamp electrode set. The grounding device is installed on the liftable support at the tail end of the test specimen. The high-voltage lead is connected to the clamp electrode set where the head end of the test specimen is placed. The test specimen is pressurized to 440kV, and after one minute of pressurization, the voltage is uniformly reduced. This invention enables the large-scale completion of AC withstand voltage tests on 220kV and 330kV insulating tools using a 500kV test transformer.

[0005] However, the aforementioned technologies often have the following drawbacks: During the placement of the test sample, operators need to carry the sample up an insulated step stool to place it onto the clamping electrodes for fixation. This makes the placement process complex and carries certain safety risks, especially when climbing at heights, where operator instability could lead to falls and injuries. Furthermore, the existing clamping electrodes have a simple structure, only capable of holding specific types of insulating tools. They are not universally compatible with bar-type tools such as insulating rods and flexible tools such as insulating ropes, requiring different clamping devices, increasing operational complexity and equipment costs. Moreover, the grounding wire of the existing device is prone to swaying or tangling during the raising and lowering of the clamping electrodes, and changes in wire length can cause slackness, leading to increased grounding resistance and affecting the accuracy of test results. Finally, the distance between the two clamping electrodes of the existing device is inconvenient to adjust, making it difficult to adapt to insulating tools of different lengths and specifications, and hindering flexible testing across different grades and specifications. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simple and safe device and method for classifying AC withstand voltage tests on insulating tools.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an AC withstand voltage test device for graded insulating tools, comprising a mounting frame, a test component slidably mounted on the mounting frame, a lifting component provided on the top of the mounting frame, the lifting component being connected to the test component for adjusting the height of the test component; the test component includes clamping electrodes, the clamping electrodes comprising an upper clamping plate and a lower clamping plate, the lower clamping plate having a groove in the middle of its top, the sidewall of the groove having a serrated slot, the upper clamping plate being elongated, and the width of the upper clamping plate being smaller than the width of the groove, copper electrodes being evenly distributed on the opposite surfaces of the upper and lower clamping plates, and fixing bolts being threaded to both ends of the upper and lower clamping plates; the copper electrodes on the upper clamping plate being electrically connected to a high-voltage lead; and the copper electrodes on the lower clamping plate being electrically connected to a grounding wire.

[0008] As a further improvement of the present invention, two mounting frames are symmetrically arranged, each mounting frame is provided with a pair of support frames, each support frame is composed of a chassis and columns, and two columns are provided and symmetrically arranged on the top of the chassis. A crossbeam is fixed to the top of the two support frames, and the test component is slidably arranged between the two columns.

[0009] As a further improvement of the present invention, the lifting assembly includes rollers mounted on the top crossbeams of the mounting brackets on both sides. The rollers are arranged in pairs, and an insulating pull rope is installed on each roller. The end of the insulating pull rope away from the roller passes through a through hole in the crossbeam and is fixedly connected to the upper clamping plate. The rollers are rotatably mounted on the crossbeam via mounting shafts. A gear set for driving the rollers on both sides to rotate is provided on the side wall of the crossbeam. The gear set consists of one driving gear and two driven gears. The two driven gears are coaxially fixedly connected to the corresponding rollers. A motor is fixed on the side wall of the crossbeam. A connecting rod is fixed to the end of the output shaft of the motor. The driving gear is fixed to the connecting rod. The driven gears on both sides are meshed and connected to the two sides of the driving gear. The connecting rod drives and connects the gear sets on both sides of the crossbeam.

[0010] As a further improvement of the present invention, the connecting rod is a telescopic rod, which consists of rod bodies at both ends and a middle sleeve. Locking sleeves are threaded to both ends of the sleeve, and the connecting rod is locked and fixed after the length of the connecting rod is adjusted by the locking sleeves.

[0011] As a further improvement of the present invention, an L-shaped mounting groove is provided in the middle of the chassis, one end of the grounding wire is electrically connected to the lower clamping plate, the other end of the grounding wire passes through the mounting groove and extends to the side of the chassis, a contact block is provided inside the mounting groove, a slide rail is fixed on the side wall of the column, a slider is slidably installed in the middle of the slide rail, the end of the grounding wire away from the lower clamping plate is connected to the slider, and a locking bolt is threadedly connected to the side wall of the slider.

[0012] As a further improvement of the present invention, a spring is installed between the upper clamping plate and the lower clamping plate, and the spring is sleeved on the fixing bolt.

[0013] As a further improvement of the present invention, a connecting seat is fixed at the bottom of the lower clamping plate, the connecting seat is electrically connected to the copper electrode on the lower clamping plate, and connectors are fixed at both ends of the grounding wire. Mounting holes matching the connectors are opened on the connecting seat and the slider respectively, and the connectors at both ends of the grounding wire are inserted into the connecting seat and the slider respectively.

[0014] As a further improvement of the present invention, a support rod is rotatably mounted on the side wall of the crossbeam, and the insulating pull rope is supported by the support rod so that the insulating pull rope passes vertically through the through hole.

[0015] A method for classifying AC withstand voltage tests on insulating tools, the method employing the aforementioned classifying AC withstand voltage test device for insulating tools, includes the following steps: S1: The motor drives the active gear to rotate, which in turn drives the driven gear and the roller, releases the insulating pull rope, lowers the height of the clamp electrode, and at the same time drives the gear set and roller on the other side through the connecting rod to provide power so that the clamp electrode on the other side moves synchronously. S2: Loosen the fixing bolts, and the spring will push the distance between the upper and lower clamping plates to increase. Place the two ends of the multiple test tools in the serrated grooves of the lower clamping plate in sequence, and then tighten the fixing bolts to clamp the test tools between the upper and lower clamping plates. S3: Connect one end of the grounding wire to the connecting seat at the bottom of the lower clamping plate, and pass the other end through the mounting groove in the middle of the chassis and connect it to the slider. S4: Use the lifting assembly to raise the clamping electrode and the tool under test to the specified height; S5: Connect the high-voltage lead to the test transformer to apply pressure to the tool under test; S6: After the pressure reaches the predetermined time, reduce the pressure to zero, cut off the power supply, and enter the test device to check the test sample. If the test sample shows no breakdown, no flashover, and no overheating under the specified test voltage and withstand time, it is a qualified product.

[0016] As a further improvement of the present invention, in step S1, the distance between the two mounting brackets is adjusted by adjusting the length of the connecting rod, thereby simultaneously adjusting the distance between the electrodes of the two clamping plates to adapt to insulating tools with different test lengths.

[0017] Compared with existing technologies, the advantages and positive effects of this invention are as follows: This invention adjusts the height of the test assembly by setting a lifting component, allowing workers to install the tool under test from the ground without needing to climb, making the operation simpler and safer. Furthermore, the height of the tool under test can be adjusted as needed during the test to meet more inspection requirements. Additionally, when testing strip-type tools, the strip-type tool can be placed in the serrated groove, which limits its left and right movement to prevent rolling. Then, an upper clamp is used to press the top of the strip-type tool for clamping and fixing. When testing flexible tools, the end of the flexible tool can be placed in the serrated groove, and then the upper clamp is used to press the flexible tool downwards. Since the width of the upper clamp is less than the width of the groove, the upper clamp can be pressed into the groove, thus pressing the flexible tool into the groove. The pressed position of the flexible tool is curved, increasing the friction between it and the clamp electrode, thereby stably clamping the flexible tool. This allows for clamping different types of tools, broadening its applicability.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the invention from another angle; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the upper and lower clamping plates of the present invention; Figure 5 This is a partial structural schematic diagram of the present invention; Explanation of the labels in the diagram: 1-Chassis, 2-Column, 3-Upper clamping plate, 4-Lower clamping plate, 5-Crossbeam, 6-Insulated pull rope, 7-Roller, 8-Connecting rod, 9-Motor, 10-Driving gear, 11-Driven gear, 12-Fixing bolt, 13-Spring, 14-Copper electrode, 15-High voltage lead, 16-Grounding wire, 17-Connector, 18-Connecting seat, 19-Slide rail, 20-Slider, 21-Locking bolt, 22-Mounting groove, 23-Contact block, 24-Support rod. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] Reference Figures 1 to 5 The present invention provides a graded AC withstand voltage test device for insulating tools, which mainly consists of a mounting frame, a test assembly, a lifting assembly, a grounding wire 16, and a high-voltage lead 15.

[0025] Reference Figure 1 , Figure 2 Two mounting frames are symmetrically arranged, each with a pair of support frames. Each support frame consists of a base 1 and columns 2. The base 1 is a flat structure used to support the entire device; it is preferably made of metal, has good electrical conductivity, and can be directly connected to the ground. Two columns 2 are symmetrically arranged on top of the base 1. Each column 2 is a vertical column used to support the crossbeam 5 and guide the sliding of the test assembly. The crossbeam 5 is fixed to the top of the two support frames, spanning between the two columns 2, forming a stable portal frame structure.

[0026] Reference Figures 1 to 4 The test assembly is slidably positioned between two columns 2 for AC withstand voltage testing of insulating tools. The test assembly includes clamping electrodes, comprising an upper clamping plate 3 and a lower clamping plate 4. A groove is formed in the center of the top of the lower clamping plate 4, extending along its length. A serrated slot is provided on the side wall of the groove at the top of the lower clamping plate 4, used to place the tool under test and limit its lateral movement to prevent it from rolling. The upper clamping plate 3 is elongated, its width being less than the width of the groove in the lower clamping plate 4, allowing it to be pressed into the groove. Copper electrodes 14 are evenly distributed on the opposing surfaces of the upper and lower clamping plates 3 and 4, used to contact the tool under test and establish an electrical connection. Fixing bolts 12 are threaded to both ends of the upper and lower clamping plates 3 and 4, used to adjust the clamping force between them.

[0027] Reference Figure 4 , Figure 5 The copper electrode 14 on the upper clamping plate 3 is electrically connected to the high-voltage lead 15 for connection to the high-voltage output terminal of the test transformer. The copper electrode 14 on the lower clamping plate 4 is electrically connected to the grounding wire 16 for connection to the earth, forming a test circuit.

[0028] Reference Figure 2 The lifting assembly is located at the top of the mounting frame and is used to adjust the height of the test assembly. The lifting assembly includes rollers 7 mounted on the top crossbeams 5 of the mounting frames on both sides. The rollers 7 are arranged in pairs, with two rollers 7 mounted on each crossbeam 5, corresponding to the clamping electrodes on both sides respectively. An insulated pull rope 6 is mounted on the roller 7, with one end of the insulated pull rope 6 passing through a through hole in the crossbeam 5 and fixedly connected to the upper clamping plate 3. The rollers 7 are rotatably mounted on the crossbeams 5 via a mounting shaft and can rotate freely around the mounting shaft.

[0029] A gear set for driving the rotation of the two side rollers 7 is provided on the side wall of the crossbeam 5. The gear set consists of one driving gear 10 and two driven gears 11, with the two driven gears 11 coaxially fixedly connected to the corresponding rollers 7. A motor 9 is fixed to the side wall of the crossbeam 5, and a connecting rod 8 is fixed to the end of the output shaft of the motor 9. The driving gear 10 is fixed to the connecting rod 8. The driven gears 11 on both sides are meshed with the two sides of the driving gear 10. When the driving gear 10 rotates, the driven gears 11 on both sides rotate synchronously in opposite directions, thereby driving the rollers 7 to synchronously release or rewind the insulating pull rope 6.

[0030] Reference Figure 2 The connecting rod 8 connects the gear sets on the two crossbeams 5, allowing the motors 9 on both sides to synchronously drive the clamping electrodes on both sides to rise and fall synchronously, ensuring that the clamping electrodes on both sides are at the same height. The connecting rod 8 is a telescopic rod, consisting of rod bodies at both ends and a middle sleeve. Locking sleeves are threaded to both ends of the sleeve, which can be used to lock and fix the connecting rod 8 after the length is adjusted. When adjusting the distance between the mounting brackets on both sides, the length of the connecting rod 8 can be adjusted synchronously, thereby synchronously adjusting the distance between the clamping electrodes on both sides, so as to meet the installation of insulating tools with different test lengths.

[0031] Reference Figure 5 An L-shaped mounting groove 22 is provided in the middle of the chassis 1. One end of the grounding wire 16 is electrically connected to the lower clamping plate 4, and the other end of the grounding wire 16 passes through the mounting groove 22 and extends to the side of the chassis 1. A contact block 23 is provided inside the mounting groove 22. The contact block 23 is made of copper and has good conductivity, and can be electrically connected to the chassis 1.

[0032] A slide rail 19 is fixed to the side wall of the column 2, and the slide rail 19 extends vertically. A slider 20 is slidably mounted in the middle of the slide rail 19, and the slider 20 can slide up and down along the slide rail 19. The end of the grounding wire 16 away from the lower clamping plate 4 is connected to the slider 20. A locking bolt 21 is threaded onto the side wall of the slider 20 to fix the slider 20 to the slide rail 19.

[0033] During operation, the clamping electrode moves upward, simultaneously driving the grounding wire 16 upward as well, with the lower end of the grounding wire 16 sliding in the mounting groove 22. Once the clamping electrode reaches the designated position, the slider 20 slides upward along the slide rail 19, simultaneously driving the grounding wire 16 to move, bringing it to a relatively taut state. The slider 20 is then fixed in the slide rail 19 by the locking bolt 21. At this time, the grounding wire 16 remains in contact with the contact block 23, achieving grounding through the chassis 1. By tautning the grounding wire 16, the length of the grounding wire 16 located between the lower clamping plate 4 and the chassis 1 can be shortened, reducing the influence of resistance on the detection results. Furthermore, the taut grounding wire 16 is positioned between the two side columns 2, preventing unnecessary swinging or loosening of the grounding wire 16 during operation.

[0034] Reference Figure 5 A spring 13 is installed between the upper clamping plate 3 and the lower clamping plate 4, and the spring 13 is sleeved on the fixing bolt 12. By setting the spring 13, the distance between the upper clamping plate 3 and the lower clamping plate 4 is increased, which facilitates the subsequent placement of the test tool and improves the convenience of operation.

[0035] A connecting seat 18 is fixed to the bottom of the lower clamping plate 4, and the connecting seat 18 is electrically connected to the copper electrode 14 on the lower clamping plate 4. Connectors 17 are fixed to both ends of the grounding wire 16. Mounting holes matching the connectors 17 are respectively provided on the connecting seat 18 and the slider 20. The outer wall of the connector 17 is provided with external threads, and the inner wall of the mounting hole is provided with internal threads. The connector 17 and the mounting hole are threaded together to allow for quick installation and removal of the grounding wire 16.

[0036] Reference Figure 2 A support rod 24 is rotatably mounted on the side wall of the crossbeam 5. The support rod 24 supports the insulating pull rope 6 so that the insulating pull rope 6 passes vertically through the through hole. The insulating pull rope 6 passes around the top of the support rod 24 and passes vertically through the through hole to reduce the friction between the insulating pull rope 6 and the through hole, thereby reducing the wear of the insulating pull rope 6 and extending its service life.

[0037] The usage process of the present invention will now be described in detail with reference to the accompanying drawings.

[0038] Step 1: Motor 9 drives the drive gear 10 to rotate, which in turn drives the driven gear 11 and the roller 7, releasing the insulated pull rope 6 and lowering the height of the clamping electrode. Simultaneously, the connecting rod 8 drives the gear set and roller 7 on the other side, providing power to make the clamping electrode on the other side move synchronously. At this point, the operator can stand on the ground to install the test tool, eliminating the need for climbing, making the operation simpler and safer.

[0039] Step 2: Loosen the fixing bolt 12, which will increase the distance between the upper clamping plate 3 and the lower clamping plate 4 by pushing the spring 13. Place the two ends of the multiple test tools in the serrated grooves of the lower clamping plate 4 in sequence, and then tighten the fixing bolt 12 to clamp the test tools between the upper clamping plate 3 and the lower clamping plate 4.

[0040] When testing strip-shaped tools such as insulating rods, electroscopes, and link bars, the strip-shaped tool can be placed in the serrated groove. The groove limits the left and right movement of the strip-shaped tool to prevent it from rolling. Then, the upper clamp 3 is used to press the top of the strip-shaped tool to clamp and fix it.

[0041] When testing flexible tools such as insulating ropes, the end of the flexible tool can be placed in the serrated groove, and then the upper clamping plate 3 is used to press the flexible tool downward. Since the width of the upper clamping plate 3 is smaller than the width of the groove, the upper clamping plate 3 can be pressed into the groove, thereby pressing the flexible tool into the groove. The position where the flexible tool is pressed is bent, and the friction between it and the clamping plate electrode is greater, so that the flexible tool can be clamped stably.

[0042] Step 3: Connect one end of the grounding wire 16 to the connecting seat 18 at the bottom of the lower clamping plate 4, and let the other end pass through the mounting groove 22 in the middle of the chassis 1 and connect to the slider 20.

[0043] Step 4: Use the lifting assembly to raise the clamp electrode and the test tool to the specified height. During the upward movement of the clamp electrode, the grounding wire 16 is simultaneously moved upward, with its lower end sliding in the mounting groove 22. Once the clamp electrode reaches the specified position, the slider 20 slides upward along the slide rail 19, simultaneously moving the grounding wire 16 to a relatively taut state. Then, the slider 20 is fixed in the slide rail 19 using the locking bolt 21. At this time, the grounding wire 16 remains in contact with the contact block 23, achieving grounding through the chassis 1.

[0044] Step 5: Connect the high-voltage lead 15 to the test transformer to apply pressure to the test tool. After the predetermined time has elapsed, reduce the voltage to zero, disconnect the power supply, and enter the test device to inspect the test sample. If the test sample shows no breakdown, no flashover, and no overheating under the specified test voltage and withstand time, it is considered a qualified product.

[0045] To achieve graded withstand voltage tests, the length of the connecting rod 8 is adjusted to regulate the distance between the mounting brackets on both sides, thereby synchronously adjusting the distance between the electrodes on both sides of the clamp plate to accommodate insulating tools of different test lengths. The lifting assembly is then used to raise the tool under test to different heights, and the output voltage and pressurization time of the power supply are controlled. By changing different test conditions, graded AC withstand voltage tests are achieved.

[0046] It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this invention through logical analysis, reasoning, or limited experimentation on the basis of the prior art should be within the scope of protection defined by the claims.

Claims

1. A graded AC withstand voltage test device for insulating tools, characterized in that: The test assembly includes a mounting frame, on which the test component is slidably mounted. A lifting assembly is provided on the top of the mounting frame and is connected to the test component to adjust the height of the test component. The test component includes a clamping electrode, which includes an upper clamping plate (3) and a lower clamping plate (4). A groove is provided in the middle of the top of the lower clamping plate (4), and a serrated slot is provided on the side wall of the groove. The upper clamping plate (3) is long and narrow, and its width is smaller than the width of the groove. Copper electrodes (14) are evenly distributed on the opposite surfaces of the upper clamping plate (3) and the lower clamping plate (4). Fixing bolts (12) are threaded to both ends of the upper clamping plate (3) and the lower clamping plate (4). The copper electrodes (14) on the upper clamping plate (3) are electrically connected to the high-voltage lead (15). The copper electrodes (14) on the lower clamping plate (4) are electrically connected to the grounding wire (16).

2. The AC withstand voltage test device for graded insulation tools according to claim 1, characterized in that: Two mounting frames are symmetrically arranged, and each mounting frame is provided with a pair of support frames. The support frame consists of a chassis (1) and a column (2). There are two columns (2) symmetrically arranged on the top of the chassis (1). A crossbeam (5) is fixed on the top of the two support frames. The test component is slidably arranged between the two columns (2).

3. The AC withstand voltage test device for graded insulation tools according to claim 2, characterized in that: The lifting assembly includes rollers (7) mounted on the top crossbeams (5) of the two side mounting frames. The rollers (7) are arranged in pairs, and an insulating pull rope (6) is installed on each roller (7). The end of the insulating pull rope (6) away from the roller (7) passes through a through hole in the crossbeam (5) and is fixedly connected to the upper clamping plate (3). The rollers (7) are rotatably mounted on the crossbeam (5) via a mounting shaft. A gear set for driving the two rollers (7) to rotate is provided on the side wall of the crossbeam (5). The gear set consists of an active gear. The device consists of a gear (10) and two driven gears (11). The two driven gears (11) are coaxially fixedly connected to the corresponding rollers (7). A motor (9) is fixed on the side wall of the crossbeam (5). A connecting rod (8) is fixed at the end of the output shaft of the motor (9). The driving gear (10) is fixed on the connecting rod (8). The driven gears (11) on both sides are meshed and connected to the two sides of the driving gear (10). The connecting rod (8) drives the gear sets on the two sides of the crossbeam (5).

4. The AC withstand voltage test device for graded insulation tools according to claim 3, characterized in that: The connecting rod (8) is a telescopic rod, which consists of rods at both ends and a middle sleeve. Locking sleeves are threaded to both ends of the sleeve, and the connecting rod (8) is locked and fixed after the length of the connecting rod (8) is adjusted by the locking sleeves.

5. The AC withstand voltage test device for graded insulation tools according to claim 4, characterized in that: The chassis (1) has an L-shaped mounting groove (22) in the middle. One end of the grounding wire (16) is electrically connected to the lower clamping plate (4). The other end of the grounding wire (16) passes through the mounting groove (22) and extends to the side of the chassis (1). A contact block (23) is provided inside the mounting groove (22). A slide rail (19) is fixed on the side wall of the column (2). A slider (20) is slidably installed in the middle of the slide rail (19). The end of the grounding wire (16) away from the lower clamping plate (4) is connected to the slider (20). A locking bolt (21) is threaded on the side wall of the slider (20).

6. The AC withstand voltage test device for graded insulation tools according to claim 5, characterized in that: A spring (13) is installed between the upper clamping plate (3) and the lower clamping plate (4), and the spring (13) is sleeved on the fixing bolt (12).

7. The AC withstand voltage test device for graded insulation tools according to claim 6, characterized in that: The bottom of the lower clamping plate (4) is fixed with a connecting seat (18), which is electrically connected to the copper electrode (14) on the lower clamping plate (4). The two ends of the grounding wire (16) are respectively fixed with connectors (17). The connecting seat (18) and the slider (20) are respectively provided with mounting holes that match the connectors (17). The connectors (17) at both ends of the grounding wire (16) are respectively inserted into the connecting seat (18) and the slider (20).

8. The AC withstand voltage test device for graded insulating tools according to claim 7, characterized in that: A support rod (24) is rotatably mounted on the side wall of the crossbeam (5). The support rod (24) supports the insulating pull rope (6) so that the insulating pull rope (6) passes vertically through the through hole.

9. A method for classifying AC withstand voltage tests on insulating tools, the method employing the AC withstand voltage test apparatus for classifying insulating tools according to any one of claims 1-8, characterized in that: Includes the following steps: S1: The motor (9) drives the active gear (10) to rotate, which in turn drives the driven gear (11) and the roller (7), releases the insulating pull rope (6), lowers the height of the clamp electrode, and at the same time drives the gear set and roller (7) on the other side through the connecting rod (8) to provide power so that the clamp electrode on the other side moves synchronously. S2: Loosen the fixing bolt (12), and push the distance between the upper clamping plate (3) and the lower clamping plate (4) to increase through the spring (13). Place the two ends of the multiple test tools in the serrated slot of the lower clamping plate (4) in sequence, and then tighten the fixing bolt (12) so that the test tools are clamped between the upper clamping plate (3) and the lower clamping plate (4). S3: Connect one end of the grounding wire (16) to the connecting seat (18) at the bottom of the lower clamp (4), and the other end passes through the mounting groove (22) in the middle of the chassis (1) and connects to the slider (20); S4: Use the lifting assembly to raise the clamping electrode and the tool under test to the specified height; S5: Connect the high voltage lead (15) into the test transformer to apply pressure to the tool under test; S6: After the pressure reaches the predetermined time, reduce the pressure to zero, cut off the power supply, and enter the test device to check the test sample. If the test sample shows no breakdown, no flashover, and no overheating under the specified test voltage and withstand time, it is a qualified product.

10. A method for classifying AC withstand voltage tests on insulating tools according to claim 9, characterized in that: In step S1, the distance between the two mounting brackets is adjusted by adjusting the length of the connecting rod (8), and then the distance between the two clamping electrodes is adjusted synchronously to adapt to insulating tools of different test lengths.

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