Switching device for verification of extra-high voltage transformer

Abstract

The invention relates to a switching device for verification of an extra-high voltage transformer, and belongs to the technical field of verification of the extra-high voltage transformer, the switching device comprises a switching assembly, an auxiliary climbing assembly is arranged at the bottom end of the switching assembly, the auxiliary climbing assembly comprises a supporting column, a movable plate is hinged to the top of the front end of the supporting column, and a telescopic groove is formed in the bottom of the front end of the supporting column in a penetrating mode; an ejection mechanism capable of extending towards one side of the movable plate is mounted in the telescopic groove; a plurality of storage grooves are evenly formed in the side, away from the supporting column, of the movable plate from top to bottom, foldable pedals are movably installed at the bottom ends of the interiors of the storage grooves through torsional spring rotating shafts, and pull rope reset mechanisms used for driving the pedals to be stored or unfolded are connected between the pedals and the supporting column. According to the invention, operators can be safely and conveniently assisted in completing high-altitude wiring and verification operation, the climbing risk is remarkably reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This invention relates to a switching device for calibrating ultra-high voltage voltage transformers, belonging to the field of ultra-high voltage voltage transformer calibration technology. Background Technology

[0002] In ultra-high voltage (UHV) transmission systems, on-site calibration of voltage transformers is a crucial technical step in ensuring accurate power metering and safe system operation. Currently, this work is mainly achieved through dedicated switching devices, whose core functions are to switch between different wiring methods and simulate secondary loads to meet multiple requirements such as transformer error testing, insulation testing, and protection function verification.

[0003] However, the current verification operation mode has significant safety and efficiency problems. Since current transformers are usually installed on structures or equipment supports several meters high, and the corresponding adapters must also be installed at a similar height, workers must repeatedly climb to high altitudes to perform wiring, wire replacement, and debugging operations. This process not only relies on ladders, scaffolding, and other auxiliary tools, making preparation cumbersome and time-consuming, but also forces personnel to be exposed to the risks of working at heights for extended periods near high-voltage, live equipment, facing serious safety threats such as falls and electric shocks. Furthermore, the limited field of vision and narrow operating space at heights further increase the possibility of wiring errors or tools falling. Therefore, improvements are urgently needed. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention designs a switching device for ultra-high voltage transformer verification, which can safely and conveniently assist operators in completing high-altitude wiring and verification operations, significantly reducing climbing risks and improving work efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A converter device for calibrating ultra-high voltage transformers includes a converter assembly. An auxiliary climbing assembly is located at the bottom of the converter assembly. The auxiliary climbing assembly includes a support column. A movable plate is hinged to the top of the front end of the support column. A telescopic groove is formed through the bottom of the front end of the support column. A push-out mechanism that can extend to one side of the movable plate is installed in the telescopic groove. Multiple storage slots are evenly formed from top to bottom on the side of the movable plate away from the support column. A foldable pedal is movably installed at the bottom of the storage slot via a torsion spring shaft. Each pedal is connected to the support column by a pull-rope reset mechanism. The pull-rope reset mechanism includes a first connecting block, a second connecting block, a pulley, and an elastic rope. A crossbar is fixedly connected to the side of the first connecting block. The free end of the crossbar rotates through the side wall of the movable plate and is fixedly connected to the pedal. The second connecting block and the pulley are fixed to the side of the support column. The two ends of the elastic rope are connected to the first connecting block and the second connecting block, respectively. The pulley is located between the first connecting block and the second connecting block and is movably engaged with the elastic rope.

[0006] Furthermore, the ejection mechanism includes a screw drive assembly and a ejector rod. The screw drive assembly includes a drive screw rotatably mounted in the telescopic groove and a drive plate threaded onto the drive screw. A screw jack is fixedly mounted at the rear end of the support column. One end of the drive screw extends out of the telescopic groove and is connected to the screw jack for transmission. A support plate is integrally fixedly connected to the inner end of the ejector rod. The top end of the support plate is engaged with the drive plate, and the bottom end of the support plate is slidably connected to the inner bottom wall of the telescopic groove. The outer end of the ejector rod is in contact with the inner side of the movable plate.

[0007] Furthermore, a sliding groove with a parallel drive screw is provided at the bottom of the telescopic groove, and a slider is slidably installed in the sliding groove. The slider is located directly below the support plate, and a spring rod connects the slider and the support plate.

[0008] Furthermore, the adapter assembly includes an adapter box, the bottom of which is provided with several sets of terminals, and the top of which is fixedly connected with a baffle. Several evenly arranged hydraulic buffer rods are connected between the baffle and the support column.

[0009] Furthermore, two vertically spaced side plates are integrally fixedly installed at the front end of the support column, and a hidden groove is formed between the two side plates. The movable plate is set in the hidden groove. One side plate has a notch, and the front end of the other side plate is rotatably connected to a limiting plate for limiting the position of the movable plate.

[0010] Furthermore, a support block is integrally fixedly connected to both sides of the bottom end of the support column. The support block is a right-angled triangular block, and several threaded grooves are opened on the support block. Limiting pins are detachably installed in the threaded grooves.

[0011] Furthermore, two handrails are symmetrically installed at the front end of the movable plate, with the two handrails respectively located on both sides of the pedal.

[0012] Furthermore, a top block is integrally fixedly connected to the outer end of the top rod, and the free end of the top block is arc-shaped.

[0013] Furthermore, a limit block is integrally fixedly connected to the free end of the drive screw.

[0014] Furthermore, the screw jack is equipped with a hand crank for driving the screw to rotate.

[0015] Compared with the prior art, the present invention has the following features and beneficial effects: 1. This invention, through the installation of a hydraulic buffer rod, allows operators to raise the adapter box to a convenient operating height by pushing a baffle, completing the connection with the current transformer. All subsequent operations can be performed on the ground, significantly reducing the risks of working at height. After connection, operators connect the calibration instrument to the docking port at the lower end of the device. Using the three sets of terminals on the adapter box, multiple wire swaps can be performed on the ground to achieve different load switching operations, greatly improving calibration efficiency and avoiding repeated climbing. This invention has a reasonable structure, transforming traditional high-altitude, high-risk calibration work into a safe and convenient ground-based operation, making it suitable for widespread adoption.

[0016] 2. This invention uses a push-out mechanism at the bottom of the support column to push the movable plate outward, thereby quickly forming a temporary climbing support. Simultaneously, when the movable plate is pushed out, the tension of the elastic rope changes direction via a pulley, pulling the pedal from the storage slot to a horizontal working position. When the movable plate retracts, the tension of the elastic rope and the torsion spring shaft work together to automatically and reliably fold the pedal back into the storage slot, significantly simplifying the climbing preparation and packing process. This allows operators to safely and conveniently climb to perform initial wiring operations. Combined with the subsequent transfer function that allows verification on the ground, this further enhances the overall practicality and safety of the device.

[0017] 3. This invention uses a hand crank to drive a screw jack, which rotates the drive screw, causing the drive plate mounted on it to move smoothly. The drive plate, through a support plate that engages with it, drives the top rod to move synchronously, thereby pushing out the movable plate. The screw drive has a self-locking characteristic, which can reliably lock the position of the movable plate. At the same time, the structure in which the bottom end of the support plate is slidably connected to the bottom wall of the telescopic groove provides a stable lateral sliding guide for the drive plate and the top rod, effectively constraining the movement trajectory and ensuring that the force is uniform and controllable throughout the entire pushing process. This makes the unfolding and retraction of the auxiliary climbing component more labor-saving, stable, safe, and reliable, effectively improving the ease of operation and mechanical stability of the device. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram from a first perspective of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the invention from a second perspective; Figure 3 This is a three-dimensional structural diagram of the invention from a third perspective; Figure 4 This is a side view of the present invention; Figure 5 This is a side sectional view of the present invention. Figure 6 This is a schematic diagram of the installation structure of the ejection mechanism of the present invention; Figure 7This is a schematic diagram of the front cross-sectional structure of the present invention.

[0019] The attached diagram is labeled as follows: 1. Support column; 2. Hidden groove; 3. Telescopic groove; 4. Screw jack; 401. Drive screw; 5. Drive plate; 6. Slide groove; 7. Slider; 8. Support plate; 9. Spring rod; 10. Top rod; 11. Top block; 12. Movable plate; 13. Storage groove; 14. Pedal; 15. Rotating port; 16. Crossbar; 17. First connecting block; 18. Second connecting block; 19. Pulley; 20. Elastic rope; 21. Limiting block; 22. Hand crank; 23. Side plate; 24. Notch groove; 25. Handrail; 26. Baffle; 27. Hydraulic buffer rod; 28. Adapter box; 29. ​​Terminal; 291. Positive terminal; 292. Negative terminal; 30. Limiting plate; 31. Support block; 32. Threaded groove. Detailed Implementation

[0020] The present invention will now be described in more detail with reference to the embodiments.

[0021] Example 1 Please see Figures 1 to 7 The UHV voltage transformer calibration adapter of this embodiment includes an adapter assembly, wherein the adapter assembly includes an adapter box 28, and the bottom of the adapter box 28 is provided with three sets of terminals 29, each set of terminals 29 having two terminals, and the two terminals 29 are positive terminal 291 and negative terminal 292 respectively.

[0022] Meanwhile, a baffle 26 is fixedly connected to the top of the junction box 28 by multiple bolts. Four evenly arranged hydraulic buffer rods 27 are connected between the baffle 26 and the support column 1. When the operator pushes the baffle 26, the baffle 26 can be moved upward under the action of the hydraulic buffer rods 27, which makes it convenient for the operator to connect the UHV voltage transformer to the terminal 29 on the junction box 28.

[0023] After the connection is completed, the operator can return to the ground and connect the calibration instrument to the corresponding terminal 29 on the adapter box 28. When the load switching or other operations are required during the test, the operator can complete the switching operation directly on the ground by switching the wires, avoiding the risk of climbing to a height again and providing convenience for the calibration work.

[0024] In this embodiment, the baffle 26 is made of epoxy resin board, which has good waterproof and insulation properties.

[0025] As described above, this invention, through the hydraulic buffer rod 27, allows operators to raise the adapter box 28 to a convenient operating height by pushing the baffle 26, thus completing the connection with the current transformer. All subsequent operations can be performed on the ground, significantly reducing the risks of working at heights. After connection, operators connect the calibration instrument to the docking port at the lower end of the device. Using the three sets of terminals 29 on the adapter box 28, multiple wire swaps can be performed on the ground to achieve different load switching operations, greatly improving calibration efficiency and avoiding repeated climbing. Furthermore, the baffle 26 is made of epoxy resin board, whose excellent insulation and waterproof properties effectively ensure operational safety and the device's outdoor applicability. Overall, the device has a reasonable structure, transforming traditional high-altitude, high-risk calibration work into a safe and convenient ground-based operation, making it suitable for widespread adoption.

[0026] Example 2 Please see Figures 1 to 7 The UHV voltage transformer calibration adapter in this embodiment, based on the above embodiment one, has an auxiliary climbing component at the bottom of the adapter component.

[0027] Specifically, the climbing aid includes a support column 1. In this embodiment, the support column 1 is a vertically arranged rectangular column, which is convenient to be erected on the ground.

[0028] A movable plate 12 is hinged to the top of the front end of the support column 1. A telescopic groove 3 is opened through the bottom of the front end of the support column 1. A push-out mechanism that can extend to one side of the movable plate 12 is installed in the telescopic groove 3. The operator operates the push-out mechanism to extend to one side of the movable plate 12, so as to push the movable plate 12 outward, thereby facilitating the operator to climb to a higher position.

[0029] Multiple storage slots 13 are evenly provided from top to bottom on the side of the movable plate 12 away from the support column 1. A foldable pedal 14 is movably installed at the bottom of the storage slot 13 through a torsion spring pivot. Each pedal 14 is connected to the support column 1 by a pull rope reset mechanism.

[0030] In this embodiment, the pedal 14 is provided with anti-slip texture, which can increase the friction when the operator steps on it, prevent slipping, and further improve safety.

[0031] Specifically, the pull-rope reset mechanism includes a first connecting block 17, a second connecting block 18, a pulley 19, and an elastic rope 20. A crossbar 16 is fixedly connected to the side of the first connecting block 17. The free end of the crossbar 16 rotates through the side wall of the movable plate 12 and is fixedly connected to the pedal 14. In this embodiment, a rotation opening 15 is provided on the side wall of the movable plate 12. The crossbar 16 passes through the rotation opening 15 and is fixedly connected to the pedal 14.

[0032] The second connecting block 18 and the pulley 19 are fixed on the side of the support column 1. The two ends of the elastic rope 20 are connected to the first connecting block 17 and the second connecting block 18 respectively. The pulley 19 is located between the first connecting block 17 and the second connecting block 18 and is movably engaged with the elastic rope 20.

[0033] In this embodiment, the first connecting block 17 and the second connecting block 18 are set at the same horizontal height, and the pulley 19 is set at a slightly lower position between the first connecting block 17 and the second connecting block 18, so that the elastic rope 20 can be kept in a pulled state. The setting of the pulley 19 can adjust the pulling direction of the elastic rope 20, so that when the movable plate 12 is pushed out, the pedal 14 can be pulled out under the action of the elastic rope 20, and when the movable plate 12 is retracted, the pedal 14 can be retracted under the action of the elastic rope 20 and the torsion spring shaft, which improves the convenience of adjustment.

[0034] As can be seen from the above description, the rope reset mechanism greatly simplifies the climbing preparation and packing process, enabling operators to safely and conveniently climb to perform initial wiring operations. Combined with the subsequent transfer function that can be verified on the ground, it forms a complete and efficient operation process, further enhancing the overall practicality and safety of the device.

[0035] Furthermore, two vertically spaced side plates 23 are integrally fixedly installed at the front end of the support column 1, and a hidden groove 2 is formed between the two side plates 23. The movable plate 12 is set in the hidden groove 2. One of the side plates 23 has a notch 24, and the front end of the other side plate 23 is rotatably connected to a limiting plate 30 for limiting the movable plate 12.

[0036] As described above, the hidden groove 2 formed by the two side plates 23 allows the movable plate 12 to be completely retracted into the front of the support column 1 when not in operation, ensuring a compact and aesthetically pleasing structure. The notch 24 on the side plates 23 facilitates the operator's hand insertion to push or operate the movable plate 12, improving operational convenience. The limiting plate 30 effectively limits the movable plate 12 after it is retracted, preventing accidental unfolding and enhancing the stability and safety of the device during storage or transportation.

[0037] Furthermore, both sides of the bottom end of the support column 1 are integrally fixedly connected with support blocks 31. The support blocks 31 are right-angled triangular blocks, and several threaded grooves 32 are opened on the support blocks 31. Limit pins are detachably installed in the threaded grooves 32.

[0038] As can be seen from the above description, the right-angled triangular support blocks 31, which are integrally fixed to both sides of the bottom end of the support column 1, enhance the structural stability and anti-overturning ability of the support column 1 when it is placed vertically. The several threaded grooves 32 opened on the support block 31 and the detachable limit pin constitute a flexible ground fixing mechanism. Appropriate fixing points and fixing methods can be selected according to different ground conditions (such as soil, cement ground, etc.), effectively preventing the device from sliding or shifting during operation, and ensuring the safety and reliability of the entire calibration and transfer operation process.

[0039] Furthermore, two handrails 25 are symmetrically installed at the front end of the movable plate 12, and the two handrails 25 are respectively located on both sides of the pedal 14.

[0040] As can be seen from the above description, the handrail 25 provides workers with a stable and reliable gripping point during the climbing process, effectively improving their body balance and safety during climbing and operation, and reducing the risk of high-altitude operation.

[0041] Example 3 Please see Figures 1 to 7 The UHV voltage transformer verification adapter of this embodiment, based on the above embodiment one or embodiment two, includes a lead screw drive assembly and a push rod 10 in the ejection mechanism.

[0042] The screw drive assembly includes a drive screw 401 rotatably mounted in the telescopic groove 3 and a drive plate 5 threaded onto the drive screw 401. A screw jack 4 is fixedly mounted at the rear end of the support column 1. One end of the drive screw 401 extends out of the telescopic groove 3 and is connected to the screw jack 4 for transmission. Specifically, a hand crank 22 for driving the drive screw 401 to rotate is installed on the screw jack 4. The operator can drive the drive screw 401 to rotate by rotating the hand crank 22, thereby causing the drive plate 5 to reciprocate on the drive screw 401.

[0043] To ensure the stability of the lateral movement of the drive plate 5, a support plate 8 is integrally fixedly connected to the inner end of the top rod 10. The top end of the support plate 8 is engaged with the drive plate 5, and the bottom end of the support plate 8 is slidably connected to the inner bottom wall of the telescopic groove 3. The outer end of the top rod 10 is in contact with the inner side of the movable plate 12. By limiting the sliding direction of the support plate 8, the drive plate 5 can be stably laterally slid.

[0044] In this embodiment, the drive plate 5 is provided with a snap-fit ​​groove in the middle, which facilitates snap-fit ​​with the support plate 8.

[0045] As can be seen from the above description, the ejection mechanism, through the cooperation of the screw drive assembly driven by the hand crank 22 with the ejector rod 10 and the support plate 8, realizes the smooth and controllable ejection of the movable plate 12. The screw drive has a self-locking characteristic, which can reliably maintain the ejection position. The support plate 8 is engaged with the drive plate 5 and slidably connected to the bottom wall of the telescopic groove 3, which effectively constrains the movement trajectory of the ejector rod 10, ensuring the stability and controllability of the ejection process, making the deployment operation of the auxiliary climbing component more labor-saving, safe and reliable.

[0046] Furthermore, a sliding groove 6 is provided at the bottom of the telescopic groove 3, which is parallel to the drive screw 401. A slider 7 is slidably installed in the sliding groove 6. The slider 7 is located directly below the support plate 8, and a spring rod 9 is connected between the slider 7 and the support plate 8.

[0047] As can be seen from the above description, the sliding of the slider 7 in the groove 6 provides additional linear guidance for the lateral movement of the support plate 8 and the push rod 10, further enhancing the stability of the movement and preventing jamming. At the same time, the spring rod 9 can effectively absorb and mitigate the impact or vibration that may be generated during the push rod 10's push-out or retraction process, making the unfolding and retraction of the movable plate 12 smoother and quieter, reducing mechanical wear, and improving the service life of the push-out mechanism.

[0048] Furthermore, a top block 11 is integrally fixedly connected to the outer end of the top rod 10, and the free end of the top block 11 is arc-shaped.

[0049] As can be seen from the above description, the top block 11 can adapt to the slight changes in the contact point of the movable plate 12 during the rotation and unfolding process, ensuring that the ejection force is always effectively applied to the movable plate 12, avoiding jamming or wear that may be caused by angular deviation, and further improving the reliability and smoothness of the ejection process.

[0050] Furthermore, the free end of the drive screw 401 is integrally fixedly connected to a limit block 21.

[0051] As can be seen from the above description, the limit block 21 can prevent the drive plate 5 from accidentally coming off the threaded section due to excessive movement.

[0052] The working principle of this invention is as follows: In use, the operator can drive the drive plate 5 forward by cranking the hand crank 22. The movement of the drive plate 5 will drive the support plate 8 to move. The support plate 8 will push the top rod 10 outward, which will cause the top block 11 to push out the movable plate 12. When the movable plate 12 moves, the elastic rope 20 will pull the first connecting block 17. Under the transmission of the crossbar 16, the pedal 14 in the storage groove 13 can be flipped until the pedal 14 is horizontal. The pulley 19 can adjust the direction of the tension of the elastic rope 20. The slider 7 and the slide groove 6 can limit the movement trajectory of the drive plate 5. The handrail 25 can improve safety when the operator climbs.

[0053] After the operator climbs to a higher position, they push the baffle 26. Under the action of the hydraulic buffer rod 27, the baffle 26 can be moved upward, adjusting the height of the adapter box 28. This makes it convenient for the operator to connect the calibration equipment to the terminal block 29 on the adapter box 28, providing convenience for the calibration work.

[0054] When the work is completed and needs to be stored, the hand crank 22 can be turned in the opposite direction to retract the screw jack 4 and the top rod 10. After the movable plate 12 loses its support, it will be vertical and located between the two side plates 23 under the influence of gravity. The side plates 23 can be used to hide the movable plate 12 when it is retracted, which helps to improve the aesthetics. At the same time, it can prevent the movable plate 12 from being damaged by collision. The position of the movable plate 12 can be fixed by rotating the limit plate 30. The support block 31 can improve the stability of the support column 1. The support block 31 can be connected to the ground by the limit pin through the threaded groove 32.

[0055] In the description of this invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A switching device for calibrating ultra-high voltage voltage transformers, comprising a switching assembly, characterized in that: The bottom of the adapter is provided with an auxiliary climbing component, which includes a support column (1). The top of the front end of the support column (1) is hinged with a movable plate (12). The bottom of the front end of the support column (1) is provided with a telescopic groove (3). A push-out mechanism that can extend to one side of the movable plate (12) is installed in the telescopic groove (3). Multiple storage slots (13) are evenly provided from top to bottom on the side of the movable plate (12) away from the support column (1). A foldable pedal (14) is movably installed at the bottom of the storage slot (13) through a torsion spring pivot. Each pedal (14) is connected to the support column (1) with a pull rope reset mechanism. The pull rope reset mechanism includes a first connecting block (17), a second connecting block (18), a pulley (19), and an elastic rope (20). A crossbar (16) is fixedly connected to the side of the first connecting block (17). The free end of the crossbar (16) rotates through the side wall of the movable plate (12) and is fixedly connected to the pedal (14). The second connecting block (18) and the pulley (19) are fixed to the side of the support column (1). The two ends of the elastic rope (20) are connected to the first connecting block (17) and the second connecting block (18) respectively. The pulley (19) is located between the first connecting block (17) and the second connecting block (18) and is movably engaged with the elastic rope (20).

2. The adapter for calibrating an ultra-high voltage voltage transformer according to claim 1, characterized in that: The ejection mechanism includes a screw drive assembly and a ejector rod (10). The screw drive assembly includes a drive screw (401) rotatably installed in the telescopic groove (3) and a drive plate (5) threaded onto the drive screw (401). A screw jack (4) is fixedly installed at the rear end of the support column (1). One end of the drive screw (401) extends out of the telescopic groove (3) and is connected to the screw jack (4) in a transmission connection. A support plate (8) is integrally fixedly connected to the inner end of the ejector rod (10). The top end of the support plate (8) is engaged with the drive plate (5), and the bottom end of the support plate (8) is slidably connected to the inner bottom wall of the telescopic groove (3). The outer end of the ejector rod (10) is in contact with the inner side of the movable plate (12).

3. The adapter for calibrating an ultra-high voltage voltage transformer according to claim 2, characterized in that: The bottom of the telescopic groove (3) is provided with a sliding groove (6) for a parallel drive screw (401). A slider (7) is slidably installed in the sliding groove (6). The slider (7) is located directly below the support plate (8), and a spring rod (9) is connected between the slider (7) and the support plate (8).

4. The adapter for calibrating an ultra-high voltage voltage transformer according to claim 1, characterized in that: The adapter assembly includes an adapter box (28), with several sets of terminals (29) at the bottom of the adapter box (28) and a baffle (26) fixedly connected to the top of the adapter box (28). Several evenly arranged hydraulic buffer rods (27) are connected between the baffle (26) and the support column (1).

5. The adapter for calibrating an ultra-high voltage voltage transformer according to claim 1, characterized in that: The front end of the support column (1) is integrally fixed with two vertically spaced side plates (23), and a hidden groove (2) is formed between the two side plates (23). The movable plate (12) is set in the hidden groove (2). One of the side plates (23) has a notch (24), and the front end of the other side plate (23) is rotatably connected to a limiting plate (30) for limiting the movable plate (12) to be stored.

6. The adapter for calibrating an ultra-high voltage voltage transformer according to claim 1, characterized in that: The support column (1) has a support block (31) fixedly connected to both sides of its bottom end. The support block (31) is a right-angled triangular block, and a number of threaded grooves (32) are opened on the support block (31). Limit pins are detachably installed in the threaded grooves (32).

7. The adapter for calibrating an ultra-high voltage voltage transformer according to claim 1, characterized in that: The movable plate (12) has two handrails (25) symmetrically installed at the front end, and the two handrails (25) are respectively located on both sides of the pedal (14).

8. The adapter for calibrating an ultra-high voltage voltage transformer according to claim 2, characterized in that: The top rod (10) is integrally fixedly connected to a top block (11) at its outer end, and the free end of the top block (11) is arc-shaped.

9. A switching device for calibrating an ultra-high voltage voltage transformer according to claim 2, characterized in that: The free end of the drive screw (401) is integrally fixedly connected to a limit block (21).

10. A switching device for calibrating an ultra-high voltage voltage transformer according to claim 2, characterized in that: The screw jack (4) is equipped with a hand crank (22) for driving the screw (401) to rotate.

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