A CT unit device at an insulating basin of a transformer of a new energy booster system

Abstract

The present application relates to the field of new energy high-voltage power transmission equipment and intelligent monitoring technology, and mainly discloses a CT unit device at the insulating basin of a transformer of a new energy step-up system, which comprises a first elevated seat arranged on the surface of a transformer body, a connecting plate arranged on the inner side of the second elevated seat, and a CT unit device arranged on the side of the mounting bottom plate. The first insulating basin and the second insulating basin are cooperatively connected, the CT unit device is an independent chamber, the transformer and the bus GIL are separated, the insulating medium in the transformer body is oil, the insulating medium in the second elevated seat is SF6 gas, the indoor air pressure is 0.4 Mpa, the space of the CT unit device is small, and if the basin of the CT unit device has a sealing problem, the influence of the internal gas on the transformer body is small, so that the damage of the transformer body caused by pressure problems can be effectively prevented.

Description

Technical Field

[0001] This invention relates to the technical field of new energy high-voltage power transmission equipment and intelligent monitoring technology, specifically to a CT unit device at the insulation basin of a transformer in a new energy step-up system. Background Technology

[0002] With the explosive growth of new energy industries such as wind power and photovoltaics, the requirements for compact size and operational safety of booster stations and energy storage containers have been placed on the equipment. In new energy grid connection systems, transformers and CTs (current transformers) are the core monitoring and conversion equipment.

[0003] However, in existing new energy booster equipment, the CT is usually set up independently or adopts a traditional oil-immersed structure, resulting in a large overall size of the equipment. This makes it difficult to meet the stringent space utilization requirements of new energy power stations (especially offshore wind power platforms or containerized energy storage). In addition, the traditional structure is prone to triggering a chain reaction when a failure occurs, and it lacks a highly reliable isolation and protection mechanism for unattended environments of new energy power stations.

[0004] To achieve real-time monitoring and relay protection of the main circuit current, current transformer units (CTs) are usually installed near the basin insulator. Currently, the CTs for the high-voltage output lines of transformers on the market are installed in the riser or inside the transformer body, with the leads passing through the middle. Sufficient electrical distance must be left between the inner wall of the CT and the leads, and the insulating medium is transformer oil, which results in a large diameter riser. This makes it difficult to inspect and replace the CT. Moreover, the actual distance between the CT and the leads has a large error in the manufacturing process, which can easily cause discharge and transformer failure.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0006] The purpose of this invention is to provide a CT unit device at the insulation basin of a transformer in a new energy boosting system, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A CT unit device at the insulating basin of a transformer in a new energy boosting system includes a mounting bracket, a transformer body is provided on the surface of the mounting bracket, a first lifting seat is provided on the surface of the transformer body, a first insulating basin is provided inside the first lifting seat, a first contact seat is provided on the side of the first insulating basin, a conductor is inserted into the first insulating basin, and a lead wire is connected to the first contact seat. A second lifting seat is provided on the side of the first lifting seat. A connecting plate is provided on the inner side of the second lifting seat. A positioning tube is provided on the side of the connecting plate. A mounting base plate is provided on the end face of the positioning tube. A CT unit device is provided on the side of the mounting base plate. A junction box is provided on the outer side of the second lifting seat. A sensor unit and a signal processing module are provided inside the junction box. The sensor unit is electrically connected to a micro-water density monitoring sensor and a partial discharge monitoring electrode.

[0008] Furthermore, the second riser is provided with a second insulating basin and a second contact seat inside, the second contact seat is provided on the outer side of the second insulating basin, the first insulating basin is provided with a third contact seat, the first riser is filled with transformer oil, the signal processing module is electrically connected to the sensor unit, the micro water density monitoring sensor and the partial discharge monitoring electrode are electrically connected to the sensor unit, and the micro water density monitoring sensor and the partial discharge monitoring electrode are provided inside the second riser.

[0009] Furthermore, one end of the conductor is fixedly connected to the third contact seat, and the other end of the conductor is fixedly connected to the second contact seat. Two sets of connecting plates are provided in the second riser seat, and both sets of connecting plates are fixedly connected to the second riser seat. The conductor passes through the two sets of connecting plates, and SF6 gas is injected into the second riser seat.

[0010] Furthermore, the connecting plate has a threaded groove on its side, a limiting groove on its side, and a discharge port on its side. Several sets of discharge ports are provided, and all sets of discharge ports are located on the side of the limiting groove.

[0011] Furthermore, a movable opening is provided on the outer side of the limiting groove, a positioning groove is provided on the inner side of the limiting groove, a limiting spring and a limiting plate are provided in the limiting groove, and the limiting plate is slidably connected to the limiting groove.

[0012] Furthermore, one end of the limiting spring is fixedly connected to the bottom of the limiting plate, and the other end of the limiting spring is fixedly connected to the surface of the limiting groove. A lifting plate is provided on the side of the limiting plate, and the lifting plate is slidably connected to the moving port. A positioning port is opened on the side of the limiting plate.

[0013] Furthermore, a guide opening is provided on the side of the lifting plate, and a positioning plate is inserted into the guide opening. The positioning plate passes through the limiting plate and the lifting plate, and a positioning baffle is provided on the surface of the limiting plate.

[0014] Furthermore, the positioning baffle is slidably connected to the positioning port, and the surface of the positioning baffle is provided with damping rubber pads. Two sets of damping rubber pads are provided, and the two sets of damping rubber pads are symmetrically distributed about the positioning baffle. One end of the positioning plate is inserted into the positioning groove, and the damping rubber pads are in contact with the surface of the positioning port.

[0015] Furthermore, the upper and lower surfaces of the movable port are provided with movable sliding grooves, and the surface of the lifting plate is provided with a mesh plate. There are two sets of mesh plates, which are symmetrically distributed about the upper and lower parts of the lifting plate. The mesh plates are inserted into the movable sliding grooves and are slidably connected to the movable sliding grooves.

[0016] Furthermore, the outer ring surface of the positioning tube is threaded, the positioning tube is screwed into the threaded groove, the mounting base plate is fixedly connected to the end face of the positioning tube, the CT unit device is fixedly connected to the side of the mounting base plate, the inner ring surface of the positioning tube is provided with a positioning slot, and one end of the limiting plate is inserted into the positioning slot.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The structure of the present invention transitions through the cooperation of the first insulating basin and the second insulating basin. The CT unit device is an independent chamber that isolates the transformer and the busbar GIL. The insulating medium inside the transformer body is oil, while the insulating medium inside the second riser is SF6 gas with an indoor gas pressure of 0.4 MPa. In addition, the use of SF6 gas insulation reduces the size of the device, thereby reducing the land use cost of new energy booster stations. Moreover, the CT unit device has a smaller space, so if there is a sealing problem in the basin of the CT unit device, the internal gas has a smaller impact on the transformer body, which can effectively prevent damage to the oil tank, oil conservator, and other accessories caused by a sudden and continuous increase in pressure in the transformer body. The CT unit and conductor are rigid conductors with fixed positions, and are in SF6 gas at 0.4 MPa, ensuring effective insulation distance. The overall structure adopts an oil-gas isolation structure to prevent a single fault from paralyzing the entire expensive booster system, reducing operation and maintenance costs. In addition, this invention constructs a complete intelligent sensing layer through partial discharge monitoring electrodes and micro-water density sensors, realizing comprehensive real-time monitoring of insulation status (partial discharge) and gas quality (micro-water). This is suitable for the high requirements of unattended operation and remote maintenance in new energy fields (such as wind power and photovoltaic booster stations), significantly improving the intelligence level and intrinsic safety capability of power grid operation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the CT unit device at the transformer insulation basin of a new energy step-up system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the connecting plate and the CT unit device in the transformer insulation basin of a new energy boosting system according to an embodiment of the present invention. Figure 3 This is a cross-sectional view of the connecting plate and the CT unit device in the transformer insulation basin of a new energy boosting system according to an embodiment of the present invention. Figure 4 This is a cross-sectional view of the connecting plate in the CT unit device at the insulating basin of a new energy step-up system transformer according to an embodiment of the present invention. Figure 5 yes Figure 4 Enlarged structural diagram at point A in the diagram; Figure 6 This is a schematic diagram of the limiting plate and limiting spring structure in the CT unit device at the insulating basin of a new energy booster system transformer according to an embodiment of the present invention; Figure 7 This is a partial cross-sectional view of a CT unit device at the insulation basin of a transformer in a new energy booster system according to an embodiment of the present invention. Figure 8 This is a system diagram of a CT unit device at the transformer insulation basin of a new energy step-up system according to an embodiment of the present invention.

[0020] Figure label: 1. Mounting bracket; 2. Transformer body; 4. First lifting seat; 6. First insulating basin; 7. First contact seat; 8. Conductor; 9. Lead wire; 10. Second lifting seat; 11. Connecting plate; 12. Positioning tube; 13. Mounting base plate; 14. CT unit device; 15. Junction box; 16. Second contact seat; 17. Second insulating basin; 18. Threaded groove; 19. Limiting groove; 20. Discharge port; 21. Moving port; 22. Positioning groove; 3. Limiting spring; 24. Limiting plate; 25. Lifting plate; 26. Positioning port; 27. Guide port; 28. Positioning clamping plate; 29. ​​Positioning baffle; 30. Damping rubber pad; 31. Moving slide; 32. Mesh plate; 33. Positioning slot; 34. Third contact seat; 35. Transformer oil; 36. SF6 gas; 37. Partial discharge monitoring electrode; 38. Sensor unit; 39. Signal processing module; 40. Micro water density monitoring sensor. Detailed Implementation

[0021] The invention will now be further described with reference to the accompanying drawings and specific embodiments: Example 1 Please see Figures 1-8 According to an embodiment of the present invention, a CT unit device at the insulating basin of a transformer in a new energy boosting system includes a mounting bracket 1, a transformer body 2 disposed on the surface of the mounting bracket 1, a first lifting seat 4 disposed on the surface of the transformer body 2, a first insulating basin 6 disposed inside the first lifting seat 4, a first contact seat 7 disposed on the side of the first insulating basin 6, a conductor 8 inserted into the first insulating basin 6, and a lead wire 9 connected to the first contact seat 7.

[0022] A second lifting seat 10 is provided on the side of the first lifting seat 4. A connecting plate 11 is provided on the inner side of the second lifting seat 10. A positioning tube 12 is provided on the side of the connecting plate 11. A mounting base plate 13 is provided on the end face of the positioning tube 12. A CT unit device 14 is provided on the side of the mounting base plate 13. A junction box 15 is provided on the outer side of the second lifting seat 10. The use of an independent CT unit device 14 meets the requirements of modular unitized equipment. The input and output terminals of the transformer body 2 are directly connected to the independent CT unit device 14 through the first insulating basin 6 and the second insulating basin 17. In addition, a sealing protection is added inside the transformer body 2 to increase the reliability of the operation of the transformer body 2 and facilitate user maintenance.

[0023] Example 2 Please see Figure 7 As shown, the second riser 10 is internally provided with a second insulating basin 17 and a second contact seat 16. The second contact seat 16 is located on the outer side of the second insulating basin 17. The first insulating basin 6 is internally provided with a third contact seat 34. The first riser 4 is filled with transformer oil 35, which facilitates the isolation of the energized high-voltage winding inside the transformer body 2 from the grounded oil tank and iron core, preventing short circuits and breakdowns. At the same time, the transformer oil 35 impregnates the insulating paper and laminate inside the coil, filling the gaps, which not only improves the overall insulation strength but also prevents moisture intrusion that could cause the insulation material to become damp and age. One end of the conductor 8 is fixedly connected to the third contact seat 34. The other end of the conductor 8 is fixedly connected to the second contact seat 16. Two sets of connecting plates 11 are provided in the second riser seat 10. Both sets of connecting plates 11 are fixedly connected to the second riser seat 10. The conductor 8 passes through the two sets of connecting plates 11. SF6 gas 36 is injected into the second riser seat 10. SF6 gas 36 is sulfur hexafluoride. The electrical insulation strength of SF6 gas 36 is about 2.5 times that of air, which can effectively prevent current breakdown. The insulation of SF6 gas 36 reduces the size of the device and reduces the construction land cost of the new energy booster station. The whole adopts an oil and gas isolation structure to prevent a single fault from paralyzing the entire expensive booster system and reduce operation and maintenance costs.

[0024] Please see Figure 7 and Figure 8As shown, the junction box 15 is equipped with a sensor unit 38 and a signal processing module 39. The sensor unit 38 is electrically connected to a micro-moisture density monitoring sensor 40 and a partial discharge monitoring electrode 37. The signal processing module 39 is used to filter and convert the acquired signals from analog to digital, facilitating the subsequent uploading of monitoring data to an external operation and maintenance monitoring platform. The partial discharge monitoring electrode 37 adopts a ring-shaped electrode structure, surrounding the conductor 8, and is used to couple and acquire partial discharge electromagnetic wave signals generated in the SF6 gas 36 insulation environment inside the CT unit device 14. The micro-moisture density monitoring sensor 40 is used to monitor the pressure, temperature, and trace moisture content of the SF6 gas 36 inside the second riser 10 in real time. By monitoring changes in gas density, it is possible to effectively determine whether there is a gas leak in the CT unit device 14. By monitoring the trace moisture content, it is possible to prevent surface flashover faults caused by moisture condensation, ensuring long-term stable operation of the equipment in harsh environments (such as offshore wind power booster stations). In addition, the partial discharge monitoring electrode 37 and the trace moisture density monitoring sensor 40 are installed in a non-invasive manner. The partial discharge monitoring electrode 37 is installed on the inner surface of the second insulating basin 17 inside the second riser 10. The partial discharge monitoring electrode 37 is connected to the high-frequency signal detection circuit set in the junction box 15 through a coaxial cable, which is used to realize real-time online monitoring of the insulating basin structure and the internal insulation status of the CT unit device 14, and to provide early warning of insulation defects.

[0025] The connecting plate 11 has a threaded groove 18 on its side. The threaded groove 18 facilitates the subsequent screwing of the positioning tube 12 into the threaded groove 18 for fixation. The connecting plate 11 has an overall annular plate structure. The threaded groove 18 has a limiting groove 19 on its side. The limiting groove 19 has a discharge port 20 on its side. Several sets of discharge ports 20 are provided, all of which are located on the side of the limiting groove 19. The multiple sets of discharge ports 20 also facilitate the timely discharge of liquid in the limiting groove 19 or facilitate the subsequent cleaning of the inside of the limiting groove 19. The outer side of the limiting groove 19 has a moving port 21, and the inner side of the limiting groove 19 has a positioning groove 22. The limiting groove 19 is provided with a limiting spring 23 and a limiting plate 24. The limiting plate 24 is slidably connected to the limiting groove 19.

[0026] Example 3 Please see Figures 3-6As shown, one end of the limiting spring 23 is fixedly connected to the bottom of the limiting plate 24, and the other end of the limiting spring 23 is fixedly connected to the surface of the limiting groove 19. The spring of the limiting spring 23 facilitates the limiting of the limiting plate 24, preventing the limiting plate 24 from shifting arbitrarily. A lifting plate 25 is provided on the side of the limiting plate 24. The lifting plate 25 is slidably connected to the moving port 21. A positioning port 26 is opened on the side of the limiting plate 24, and a guide port 27 is opened on the side of the lifting plate 25. A positioning card 28 is inserted into the guide port 27. The positioning card 28 passes through the limiting plate 24 and the lifting plate 25. A positioning baffle 29 is provided on the surface of the limiting plate 24. The positioning baffle 29 prevents the positioning card 28 from being pulled out of the limiting plate 24 and the lifting plate 25. The positioning baffle 29 is slidably connected to the positioning port 26. The surface of the positioning baffle 29 is provided with a damping rubber pad 30. Two sets of damping rubber pads 30 are provided, and the two sets of damping rubber pads 30 are symmetrically distributed about the positioning baffle 29. One end of the positioning plate 28 is inserted into the positioning groove 22. The damping rubber pad 30 is in contact with the surface of the positioning port 26. When one end of the positioning plate 28 is inserted into the positioning groove 22, it is convenient to further improve the limiting of the limiting plate 24. The damping rubber pad 30 is used to increase the friction between the surface of the positioning baffle 29 and the positioning port 26. Then, in conjunction with the upward elastic force of the limiting spring 23, the positioning plate 28 is subjected to an upward force, which is convenient to further increase the stability of the positioning plate 28 inserted into the positioning groove 22 and prevent the positioning plate 28 from sliding.

[0027] Please see Figures 3-6As shown, the upper and lower surfaces of the movable port 21 are provided with movable grooves 31. The surface of the lifting plate 25 is provided with a mesh plate 32. Two sets of mesh plates 32 are symmetrically distributed about the lifting plate 25. The mesh plates 32 are inserted into the movable grooves 31 and are slidably connected to them. The two sets of mesh plates 32 facilitate the covering of the movable port 21 during subsequent vertical movement of the lifting plate 25. The mesh plates 32 also help prevent large impurities from entering the limiting groove 19 and affecting the normal operation of the limiting plate 24. The outer ring surface of the positioning tube 12 is threaded, and the positioning tube 12 is screwed into the threaded groove 18. The mounting base plate 13 is fixedly connected to the end face of the positioning tube 12, and the CT unit device 14 is fixedly connected to the side of the mounting base plate 13. The positioning tube 12 has a positioning slot 33 on its inner circumferential surface. One end of the limiting plate 24 is inserted into the positioning slot 33. After the positioning tube 12 is screwed into the threaded groove 18, the positioning tube 12 is prevented from rotating due to vibration and thus loosening of the connection by the limiting plate 24. The positioning slot 33 and the limiting groove 19 are both annular plate structures. Moreover, the cooperation between the positioning tube 12 and the threaded groove 18 and the limiting effect of the limiting plate 24 facilitate the subsequent installation and disassembly of the CT unit device 14, as shown in Table 1 below.

[0028] Table 1

[0029] Through the above-described solution of the present invention, the present invention uses the cooperation and transition of the first insulating basin 6 and the second insulating basin 17. The CT unit device 14 is an independent chamber that isolates the transformer and the busbar GIL. The insulating medium inside the transformer body 2 is oil, and the insulating medium inside the second riser 10 is SF6 gas 36 with an indoor air pressure of 0.4 MPa. The space of the CT unit device 14 is small. If there is a sealing problem in the basin of the CT unit device 14, the internal gas will have little impact on the transformer body 2. This can effectively prevent damage to accessories such as the oil tank and oil conservator caused by a sudden and continuous increase in pressure in the transformer body 2. The CT unit device 14 and the conductor 8 are rigid conductors with fixed positions and are in SF6 gas 36 at 0.4 MPa, so the insulation distance can be effectively guaranteed.

[0030] The installation of the CT unit device 14 begins with the operator reaching into the connecting plate 11 and pulling the positioning plate 28, causing one end of the positioning plate 28 to disengage from the positioning groove 22. This releases the limiting plate 24 from its limiting position, allowing it to move along the limiting groove 19 using the elastic force of the limiting spring 23. This facilitates the pulling and displacement of the limiting plate 24 by the tension of the limiting spring 23, preventing interference with the installation and rotation of the positioning tube 12. Furthermore, the tension of the limiting spring 23 increases the friction between the positioning plate 28, the positioning groove 22, and the lifting plate 25, preventing the positioning plate 28 from moving without external force. Finally, the positioning tube 12 is screwed in. Once the CT unit device 14 is installed in the threaded groove 18, the limiting plate 24 is pulled, and the end face of the positioning tube 12 abuts against the threaded groove 18. The positioning slot 33 is then aligned with the limiting plate 24. The positioning slot 33 has an overall annular plate structure. When the limiting plate 24 is inserted into the positioning slot 33, the positioning plate 28 is pushed, so that one end of the positioning plate 28 is inserted into the positioning groove 22. This prevents the limiting plate 24 from being pulled further by the elastic force of the limiting spring 23. This makes it easier to fix the positioning tube 12 using the limiting plate 24, preventing the positioning tube 12 from rotating due to vibration. Thus, the installation and fixation of the CT unit device 14 can be completed.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CT unit device at the insulating basin of a transformer in a new energy booster system, comprising a mounting bracket (1), wherein a transformer body (2) is disposed on the surface of the mounting bracket (1), and a first lifting seat (4) is disposed on the surface of the transformer body (2), characterized in that, The first rising seat (4) is provided with a first insulating basin (6), the side of the first insulating basin (6) is provided with a first contact seat (7), a conductor (8) is inserted into the first insulating basin (6), and a lead wire (9) is connected to the first contact seat (7). A second lifting seat (10) is provided on the side of the first lifting seat (4). A connecting plate (11) is provided on the inner side of the second lifting seat (10). A positioning tube (12) is provided on the side of the connecting plate (11). A mounting base plate (13) is provided on the end face of the positioning tube (12). A CT unit device (14) is provided on the side of the mounting base plate (13). A junction box (15) is provided on the outer side of the second lifting seat (10). A sensor unit (38) and a signal processing module (39) are provided inside the junction box (15). The sensor unit (38) is electrically connected to a micro water density monitoring sensor (40) and a partial discharge monitoring electrode (37). The second riser (10) is provided with a second insulating basin (17) and a second contact (16) inside. The second contact (16) is provided on the outer side of the second insulating basin (17). The first insulating basin (6) is provided with a third contact (34). The first riser (4) is filled with transformer oil (35). The signal processing module (39) is electrically connected to the sensor unit (38). The micro water density monitoring sensor (40) and the partial discharge monitoring electrode (37) are electrically connected to the sensor unit (38). The micro water density monitoring sensor (40) and the partial discharge monitoring electrode (37) are provided inside the second riser (10). The connecting plate (11) has a threaded groove (18) on its side, and a limiting groove (19) is provided on the side of the threaded groove (18). A discharge port (20) is provided on the side of the limiting groove (19). Several sets of discharge ports (20) are provided, and all sets of discharge ports (20) are provided on the side of the limiting groove (19). The outer side of the limiting groove (19) is provided with a moving opening (21), and the inner side of the limiting groove (19) is provided with a positioning groove (22). A limiting spring (23) and a limiting plate (24) are provided in the limiting groove (19), and the limiting plate (24) is slidably connected to the limiting groove (19).

2. The CT unit device at the insulation basin of a transformer in a new energy step-up system according to claim 1, characterized in that, One end of the conductor (8) is fixedly connected to the third contact (34), and the other end of the conductor (8) is fixedly connected to the second contact (16). Two sets of connecting plates (11) are provided in the second riser (10). Both sets of connecting plates (11) are fixedly connected to the second riser (10). The conductor (8) passes through the two sets of connecting plates (11). SF6 gas (36) is injected into the second riser (10).

3. The CT unit device at the insulation basin of a transformer in a new energy step-up system according to claim 1, characterized in that, One end of the limiting spring (23) is fixedly connected to the bottom of the limiting plate (24), and the other end of the limiting spring (23) is fixedly connected to the surface of the limiting groove (19). A lifting plate (25) is provided on the side of the limiting plate (24). The lifting plate (25) is slidably connected to the moving port (21). A positioning port (26) is opened on the side of the limiting plate (24).

4. The CT unit device at the insulation basin of a transformer in a new energy step-up system according to claim 3, characterized in that, The lifting plate (25) has a guide opening (27) on its side. A positioning plate (28) is inserted into the guide opening (27). The positioning plate (28) passes through the limiting plate (24) and the lifting plate (25). A positioning baffle (29) is provided on the surface of the limiting plate (24).

5. The CT unit device at the insulation basin of a transformer in a new energy step-up system according to claim 4, characterized in that, The positioning baffle (29) is slidably connected to the positioning port (26). The surface of the positioning baffle (29) is provided with a damping rubber pad (30). There are two sets of damping rubber pads (30). The two sets of damping rubber pads (30) are symmetrically distributed about the positioning baffle (29). One end of the positioning plate (28) is inserted into the positioning groove (22). The damping rubber pad (30) is in contact with the surface of the positioning port (26).

6. The CT unit device at the insulation basin of a transformer in a new energy step-up system according to claim 5, characterized in that, The upper and lower surfaces of the movable port (21) are provided with movable grooves (31), and the surface of the lifting plate (25) is provided with a mesh plate (32). There are two sets of mesh plates (32), which are symmetrically distributed about the lifting plate (25). The mesh plates (32) are inserted into the movable grooves (31), and the mesh plates (32) are slidably connected to the movable grooves (31).

7. The CT unit device at the insulation basin of a transformer in a new energy step-up system according to claim 6, characterized in that, The outer ring surface of the positioning tube (12) is threaded, and the positioning tube (12) is screwed into the threaded groove (18). The mounting base plate (13) is fixedly connected to the end face of the positioning tube (12), and the CT unit device (14) is fixedly connected to the side of the mounting base plate (13). The inner ring surface of the positioning tube (12) is provided with a positioning slot (33), and one end of the limiting plate (24) is inserted into the positioning slot (33).

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