High-reliability voltage transformer for ring main unit

Abstract

The application discloses a high-reliability voltage transformer for ring net cabinet, and relates to the technical field of voltage transformers, which comprises a voltage transformer main body, and a leveling calibration piece is arranged on the inner side of a clamping cover. The leveling calibration piece is arranged, the ball shaft is rotated relative to the clamping ring when the clamping cover swings relative to the mounting seat, the top of the positioning bead is always in a state of adhesion with the clamping cover, the threaded screw rod is rotated after the adjustment of the clamping cover is completed, the first connecting pipe and the second connecting pipe are blocked by the movable plug block, the aqueous solution on the inner side of the piston cylinder and above the piston rod loses the flowing space, the positioning of the piston cylinder is realized, the piston cylinder is prevented from moving relative to the piston rod, the clamping cover is fixed due to the support and positioning of the piston cylinder, the voltage transformer main body is in a horizontal state, the voltage transformer main body is prevented from being cracked and deformed due to uneven stress, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] This invention relates to the field of voltage transformer technology, specifically a high-reliability voltage transformer for ring main units. Background Technology

[0002] Voltage transformers operate based on the principle of electromagnetic induction, achieving voltage transformation through electromagnetic coupling of the iron core. They convert high-voltage grid voltage into standardized low-voltage signals, meeting the needs of power system voltage acquisition, energy metering, line monitoring, and relay protection. Their applications cover power distribution facilities such as ring main units and high-voltage distribution cabinets in the smart grid industry. They are core supporting facilities within the manufacturing scope of power distribution switch control equipment, and their applications cover various power distribution facilities such as ring main units and high-voltage distribution cabinets.

[0003] The ring main unit is made by vacuum casting with flame-retardant epoxy resin, resulting in a compact structure and high mechanical strength. It also possesses excellent properties such as moisture and dust resistance, stain resistance, insulation, and aging resistance. The internal filling with flexible buffer material can effectively buffer vibration and impact, and stabilize the position of the iron core and windings. However, due to the common flatness deviations of the ring main unit cabinet mounting surface, outdoor brackets, and civil engineering foundation platform, direct rigid fixing can easily cause the voltage transformer to tilt or skew, resulting in unbalanced stress at the bottom support point and concentrated stress in the epoxy casting shell. Long-term use can easily lead to cracking, deformation, and damage to the overall insulation structure. Summary of the Invention

[0004] The purpose of this invention is to provide a highly reliable voltage transformer for ring main units, in order to solve the problem of stress imbalance at the bottom support point of the voltage transformer when it is installed in a ring main unit.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-reliability voltage transformer for ring main units, comprising a voltage transformer body, a positioning plate installed at the bottom of the voltage transformer body, a positioning cover connected to the bottom of the positioning plate, a connecting column fixedly connected to the bottom of the positioning cover, a ball shaft installed at the bottom end of the connecting column, a retaining ring sleeved on the outer side of the ball shaft, a connecting frame installed on the outer wall of the retaining ring, an annular water storage tank connected to the bottom end of the connecting frame, a mounting base installed at the bottom of the annular water storage tank located inside the positioning cover, a mounting block provided on the outer wall of the mounting base, the mounting block being fixedly connected to the ring main unit by bolts, and a leveling and calibration component provided on the inner side of the positioning cover.

[0006] As a further embodiment of the present invention: the leveling and calibration component includes a support frame installed inside the mounting base, a piston rod connected to the top of the support frame, a piston cylinder movably sleeved on the outer side of the piston rod, a positioning bead contacting the top of the piston cylinder with the inner wall of the locking cover, a guide hole extending through to the bottom of the piston rod being opened at the top of the piston rod, a second connecting pipe connected to the bottom of the piston rod, a first connecting pipe extending to the outer side of the annular water storage tank being provided inside the annular water storage tank, a barrier chamber connected to the first connecting pipe being installed at one end of the second connecting pipe, a first telescopic spring connected to the piston rod being provided at the bottom of the inner wall of the piston cylinder, a piston plate slidably connected to the inner side of the annular water storage tank, and a spring piece connected to the inner wall of the annular water storage tank being provided at the top of the piston plate.

[0007] As a further embodiment of the present invention: the leveling and calibration component further includes a movable plug block slidably connected to the inner side of the barrier chamber, and a U-shaped push rod extending to the outer side of the barrier chamber is provided on the outer side of the movable plug block. One side of the U-shaped push rod is rotatably connected to a threaded screw extending to the outer side of the mounting base via a bearing. The mounting base is provided with a threaded hole that matches the threaded screw. The outer wall of the positioning cover is provided with a limiting unit located outside the threaded screw.

[0008] As a further aspect of the present invention: the inner wall of the retaining ring is provided with an anti-slip pad that contacts the ball shaft, thereby increasing the resistance between the ball shaft and the retaining ring.

[0009] As a further embodiment of the present invention: the number of the support frame, piston rod and piston cylinder is four, the four support frames are divided into two groups, each group of support frames is symmetrically arranged along the transverse central axis of the mounting base, the two support frames in each group are symmetrically arranged along the transverse central axis of the mounting base, and the obstruction chambers on one side of adjacent support frames in each group have the same protrusion direction relative to the first connecting pipe and the second connecting pipe.

[0010] As a further embodiment of the present invention: a connecting rod is provided on the side of the movable plug away from the U-shaped push rod, extending through to the outside of the barrier chamber, and the movable plugs on the inner sides of adjacent barrier chambers are connected by the connecting rod.

[0011] As a further embodiment of the present invention: the side of the barrier chamber that contacts the first connecting pipe and the second connecting pipe is provided with a through hole of the same size as the outer wall diameter of the first connecting pipe and the second connecting pipe, and the diameter of the movable plug is larger than the inner wall diameter of the first connecting pipe and the second connecting pipe.

[0012] As a further embodiment of the present invention: the limiting unit includes a protective ring installed on the outer wall of the mounting base and located outside the threaded screw. A limiting block is installed on the outer wall of the protective ring. A movable frame is inserted into the limiting block. A baffle is installed on one side of the movable frame. A baffle is provided at one end of the movable frame. A second telescopic spring connected to the outer wall of the protective ring is provided on one side of the baffle.

[0013] As a further embodiment of the present invention: the inner diameter of the protective ring is greater than the maximum diameter of the threaded screw, and the center of the protective ring is coaxial with the center of the threaded screw.

[0014] As a further embodiment of the present invention: the diameter of the baffle is larger than the inner wall diameter of the protective ring, and the end of the baffle near the movable frame is in contact with the end of the protective ring away from the mounting seat.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. By setting a leveling and calibration component, when the positioning cover swings relative to the mounting base, the ball shaft will rotate relative to the retaining ring. At this time, the top of the positioning bead is always in contact with the positioning cover. When the positioning bead is squeezed by the positioning cover, the piston cylinder will move downward relative to the piston rod, thereby squeezing the aqueous solution inside the piston cylinder and above the guide hole. This causes the aqueous solution inside the piston cylinder to flow into the annular water storage tank through the guide hole, the second connecting pipe, the barrier chamber, and the first connecting pipe due to the squeezing. After the positioning cover is adjusted, the threaded screw is rotated, and the movable plug... The block moves between the first connecting pipe and the second connecting pipe. At this time, the first connecting pipe and the second connecting pipe will be blocked by the movable block, so that the aqueous solution inside the piston cylinder and above the piston rod loses the flow space, thereby positioning the piston cylinder and preventing the piston cylinder from moving relative to the piston rod. Since the positioning cover is supported and limited by the piston cylinder, the positioning cover can be fixed, so that the voltage transformer body is in a horizontal state, preventing cracking and deformation caused by uneven force on the voltage transformer body, and extending the service life of the equipment. 2. By setting a limiting unit, the movable plug is blocked at one end of the first and second connecting pipes by rotating the threaded screw. At this time, the end of the threaded screw away from the U-shaped push rod will engage with the inner side of the protective ring. Then, the movable frame is released, and the movable frame will move the baffle towards the protective ring under the elastic restoring force of the second telescopic spring. This allows the baffle to cover the end of the protective ring away from the mounting seat, thus blocking the end of the threaded screw away from the U-shaped push rod. When the threaded screw rotates, it will move relative to the mounting seat. At this time, because one end of the threaded screw is blocked by the baffle, the threaded screw cannot rotate relative to the mounting seat, thereby limiting the movable plug and preventing the vibration generated by the operation of the internal equipment of the ring main unit from affecting the fixation of the locking cover, further improving the stability of the locking cover after swinging. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the bottom structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the inner structure of the mounting base of the present invention;

[0020] Figure 4 This is a schematic diagram showing the connection between the card slot cover and the mounting base of the present invention;

[0021] Figure 5 This is a schematic diagram showing the connection between the piston cylinder and the first connecting pipe of the present invention;

[0022] Figure 6 This is a schematic diagram of the internal structure of the piston cylinder of the present invention;

[0023] Figure 7 This is a schematic diagram of the internal structure of the barrier chamber of the present invention;

[0024] Figure 8 This is a schematic diagram showing the connection between the protective ring and the baffle of the present invention.

[0025] In the diagram: 1. Voltage transformer body; 2. Positioning plate; 3. Clamping cover; 4. Mounting base; 5. Protective ring; 6. Connecting column; 7. Ball shaft; 8. Snap ring; 9. Piston cylinder; 10. Positioning bead; 11. Connecting frame; 12. Annular water storage tank; 13. Connecting rod; 14. Support frame; 15. Piston rod; 16. Spring; 17. Piston plate; 18. Barrier chamber; 19. First connecting pipe; 20. U-shaped push rod; 21. Flow guide hole; 22. First telescopic spring; 23. Movable plug; 24. Baffle; 25. Limiting block; 26. Second telescopic spring; 27. Limiting plate; 28. Threaded screw; 29. ​​Second connecting pipe; 30. Mounting block; 31. Movable frame. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0028] Please see Figures 1-8 In this embodiment of the invention, a high-reliability voltage transformer for a ring main unit includes a voltage transformer body 1. A positioning plate 2 is installed at the bottom of the voltage transformer body 1. A positioning cover 3 is connected to the bottom of the positioning plate 2. A connecting column 6 is fixedly connected to the bottom of the positioning cover 3. A ball shaft 7 is installed at the bottom end of the connecting column 6. A retaining ring 8 is sleeved on the outer side of the ball shaft 7. A connecting frame 11 is installed on the outer wall of the retaining ring 8. An annular water storage tank 12 is connected to the bottom end of the connecting frame 11. A mounting seat 4 located inside the positioning cover 3 is installed at the bottom of the annular water storage tank 12. A mounting block 30 is provided on the outer wall of the mounting seat 4. The mounting block 30 is fixedly connected to the ring main unit by bolts. A leveling and calibration component is provided on the inner side of the positioning cover 3.

[0029] In this embodiment, the mounting block 30 is first fixed inside the ring main unit with bolts. Then, a level is placed on top of the positioning plate 2. Subsequently, the positioning cover 3 is moved, and the position of the voltage transformer body 1 is adjusted by the swing of the positioning cover 3 relative to the mounting base 4. This adjusts the voltage transformer body 1 to a horizontal state, preventing the stability of the connection between the positioning plate 2 and the voltage transformer body 1 from being affected by the tilt of the voltage transformer body 1. Then, the positioning cover 3 is positioned by operating the leveling calibration component, so that the positioning cover 3 cannot swing relative to the mounting base 4. In this way, the horizontal state of the voltage transformer body 1 can be adjusted.

[0030] Please refer to this carefully. Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The leveling and calibration component includes a support frame 14 installed inside the mounting base 4. A piston rod 15 is connected to the top of the support frame 14. A piston cylinder 9 is movably sleeved on the outside of the piston rod 15. A positioning bead 10 is provided at the top of the piston cylinder 9, which contacts the top of the inner wall of the locking cover 3. A guide hole 21 is opened at the top of the piston rod 15, which extends to the bottom of the piston rod 15. A second connecting pipe 29 is connected to the bottom of the piston rod 15. A first connecting pipe 19 extending to the outside of the annular water storage tank 12 is provided inside the annular water storage tank 12. A barrier chamber 18 connected to the first connecting pipe 19 is installed at one end of the second connecting pipe 29. A first telescopic spring 22 connected to the piston rod 15 is provided at the bottom of the inner wall of the piston cylinder 9. A piston plate 17 is slidably connected to the inner side of the annular water storage tank 12. A spring piece 16 connected to the inner wall of the annular water storage tank 12 is provided at the top of the piston plate 17.

[0031] The leveling and calibration component also includes a movable plug 23 that is slidably connected to the inside of the barrier chamber 18. A U-shaped push rod 20 extending to the outside of the barrier chamber 18 is provided on the outside of the movable plug 23. A threaded rod 28 extending to the outside of the mounting base 4 is rotatably connected to one side of the U-shaped push rod 20 via a bearing. A threaded hole matching the threaded rod 28 is provided on the mounting base 4. A limiting unit located outside the threaded rod 28 is provided on the outer wall of the locking cover 3.

[0032] The inner wall of the retaining ring 8 is provided with an anti-slip pad that contacts the ball shaft 7, increasing the resistance between the ball shaft 7 and the retaining ring 8. There are four support frames 14, piston rods 15, and piston cylinders 9. The four support frames 14 are evenly divided into two groups. Each group of support frames 14 is symmetrically arranged along the transverse central axis of the mounting base 4. The two support frames 14 in each group are symmetrically arranged along the transverse central axis of the mounting base 4. Furthermore, the barrier chamber 18 on one side of the adjacent support frame 14 in each group is opposite to the first connecting pipe 19 and the second connecting pipe 19. The protruding directions of the connecting pipe 29 are the same. A connecting rod 13, penetrating to the outside of the barrier chamber 18, is provided on the side of the movable plug 23 away from the U-shaped push rod 20. The movable plugs 23 inside adjacent barrier chambers 18 are connected by the connecting rod 13. A through hole with the same diameter as the outer wall of the first connecting pipe 19 and the second connecting pipe 29 is provided on the side of the barrier chamber 18 that contacts the first connecting pipe 19 and the second connecting pipe 29. The diameter of the movable plug 23 is larger than the inner wall diameter of the first connecting pipe 19 and the second connecting pipe 29. It should be noted that, if... Figure 3 The movable plug 23 in the blocking chamber 18 near the threaded screw 28 is located on the side close to the threaded screw 28, while the movable plug 23 in the blocking chamber 18 away from the threaded screw 28 is located at the end close to the threaded screw 28.

[0033] In this embodiment, when the positioning cover 3 swings relative to the mounting base 4, the ball shaft 7 rotates relative to the retaining ring 8. At this time, the positioning bead 10 located inside the mounting base 4 will be squeezed by the positioning cover 3 or, due to the loss of the cover 3's shielding, will contact the inner wall of the positioning cover 3 under the elastic restoring force of the first telescopic spring 22. This ensures that the top of the positioning bead 10 is always in contact with the positioning cover 3. When the positioning bead 10 is squeezed by the positioning cover 3, the piston cylinder 9 will move downward relative to the piston rod 15. This will squeeze the aqueous solution inside the piston cylinder 9 and above the guide hole 21, causing the aqueous solution inside the piston cylinder 9 to flow into the annular water storage tank 12 through the guide hole 21, the second connecting pipe 29, the barrier chamber 18, and the first connecting pipe 19 due to the compression. Similarly, when the piston cylinder 9 moves upward relative to the piston rod 15, the aqueous solution in the annular water storage tank 12 will flow along the first connecting pipe 19 and the barrier chamber due to the extraction of the piston cylinder 9. 18. The second connecting pipe 29 and the guide hole 21 enter the inner side of the piston cylinder 9. After the positioning cover 3 is adjusted, rotate the threaded screw 28. At this time, the threaded screw 28 will move relative to the mounting seat 4 under the action of the threaded hole, so that the threaded screw 28 pushes the U-shaped push rod 20 to move, so that the movable plug 23 moves between the first connecting pipe 19 and the second connecting pipe 29. At this time, the first connecting pipe 19 and the second connecting pipe 29 will be blocked by the movable plug 23, so that the aqueous solution inside the piston cylinder 9 and above the piston rod 15 loses the flow space, thereby realizing the positioning of the piston cylinder 9 and preventing the piston cylinder 9 from moving relative to the piston rod 15. Since the positioning cover 3 is supported and limited by the piston cylinder 9, the positioning cover 3 can be fixed, so that the voltage transformer body 1 is in a horizontal state, preventing cracking and deformation caused by uneven force on the voltage transformer body 1, and extending the service life of the equipment.

[0034] Please refer to this carefully. Figure 1 , Figure 2 , Figure 8 The limiting unit includes a protective ring 5 installed on the outer wall of the mounting base 4 and located outside the threaded screw 28. A limiting block 25 is installed on the outer wall of the protective ring 5. A movable frame 31 is inserted into the limiting block 25. A baffle 24 is installed on one side of the movable frame 31. A limiting plate 27 is provided at one end of the movable frame 31. A second telescopic spring 26 connected to the outer wall of the protective ring 5 is provided on one side of the limiting plate 27.

[0035] Among them, the inner diameter of the protective ring 5 is greater than the maximum diameter of the threaded screw 28, the center of the protective ring 5 is coaxial with the center of the threaded screw 28, the diameter of the baffle 24 is greater than the inner diameter of the protective ring 5, and the end of the baffle 24 near the movable frame 31 is in contact with the end of the protective ring 5 away from the mounting seat 4.

[0036] In this embodiment, the movable plug 23 is blocked at one end of the first connecting pipe 19 and the second connecting pipe 29 by rotating the threaded screw 28. At this time, the end of the threaded screw 28 away from the U-shaped push rod 20 will be engaged inside the protective ring 5. Then, the movable frame 31 is released. At this time, the movable frame 31 will drive the baffle 24 towards the protective ring 5 under the elastic restoring force of the second telescopic spring 26, so that the baffle 24 covers the end of the protective ring 5 away from the mounting seat 4. In this way, the end of the threaded screw 28 away from the U-shaped push rod 20 can be blocked. When the threaded screw 28 rotates, it will move relative to the mounting seat 4. At this time, since one end of the threaded screw 28 is blocked by the baffle 24, the threaded screw 28 cannot rotate relative to the mounting seat 4, thereby limiting the movable plug 23 and preventing the vibration generated by the operation of the equipment inside the ring main unit from affecting the fixation of the positioning cover 3, further improving the stability of the positioning cover 3 after swinging.

[0037] The working principle of this invention is as follows: First, the mounting block 30 is fixed inside the ring main unit with bolts. Then, a level is placed on top of the positioning plate 2. Subsequently, the positioning cover 3 is moved. The position of the voltage transformer body 1 is adjusted by the swing of the positioning cover 3 relative to the mounting base 4. When the positioning cover 3 swings relative to the mounting base 4, the ball shaft 7 will rotate relative to the retaining ring 8. At this time, the positioning bead 10 located inside the mounting base 4 will be squeezed by the positioning cover 3 or will contact the inner wall of the positioning cover 3 under the elastic restoring force of the first telescopic spring 22 due to the loss of the cover 3's protection. This ensures that the top of the positioning bead 10 is always in contact with the positioning cover 3. When the positioning bead 10 is squeezed by the positioning cover 3, the piston cylinder 9 will move accordingly. The piston rod 15 is moved downwards, thereby squeezing the aqueous solution inside the piston cylinder 9 and above the guide hole 21. This squeezing forces the aqueous solution inside the piston cylinder 9 through the guide hole 21, the second connecting pipe 29, the barrier chamber 18, and the first connecting pipe 19 into the annular water storage chamber 12. Similarly, when the piston cylinder 9 moves upwards relative to the piston rod 15, the aqueous solution in the annular water storage chamber 12 is drawn into the piston cylinder 9 along the first connecting pipe 19, the barrier chamber 18, the second connecting pipe 29, and the guide hole 21. After adjusting the locking cover 3, the threaded screw 28 is rotated. At this time, the threaded screw 28 moves relative to the mounting base 4 under the action of the threaded hole, thereby causing the screw... The threaded rod 28 pushes the U-shaped push rod 20 to move, thereby moving the movable plug 23 between the first connecting pipe 19 and the second connecting pipe 29. At this time, the movable plug 23 will block the flow of the aqueous solution inside the piston cylinder 9 and above the piston rod 15, thus positioning the piston cylinder 9 and preventing it from moving relative to the piston rod 15. Since the locking cover 3 is supported and limited by the piston cylinder 9, it can be fixed, thus keeping the voltage transformer body 1 in a horizontal state. This prevents cracking and deformation caused by uneven stress on the voltage transformer body 1, extending the service life of the equipment. Then, it is released. The movable frame 31, under the elastic restoring force of the second telescopic spring 26, will drive the baffle 24 to move towards the protective ring 5, thereby covering the end of the protective ring 5 away from the mounting base 4. This will cover the end of the threaded rod 28 away from the U-shaped push rod 20. When the threaded rod 28 rotates, it will move relative to the mounting base 4. At this time, because one end of the threaded rod 28 is obstructed by the baffle 24, the threaded rod 28 cannot rotate relative to the mounting base 4, thereby limiting the movable plug 23 and preventing the vibration generated by the operation of the equipment inside the ring main unit from affecting the fixation of the locking cover 3, further improving the stability of the locking cover 3 after swinging.

[0038] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-reliability voltage transformer for ring main units, comprising a voltage transformer body (1), characterized in that, A positioning plate (2) is installed at the bottom of the voltage transformer body (1). A positioning cover (3) is connected to the bottom of the positioning plate (2). A connecting column (6) is fixedly connected to the bottom of the positioning cover (3). A ball shaft (7) is installed at the bottom end of the connecting column (6). A retaining ring (8) is sleeved on the outside of the ball shaft (7). A connecting frame (11) is installed on the outer wall of the retaining ring (8). An annular water storage tank (12) is connected to the bottom end of the connecting frame (11). A mounting seat (4) located inside the positioning cover (3) is installed at the bottom of the annular water storage tank (12). A mounting block (30) is provided on the outer wall of the mounting seat (4). The mounting block (30) is fixedly connected to the ring network cabinet by bolts. A leveling and calibration component is provided on the inner side of the positioning cover (3).

2. The high-reliability voltage transformer for ring main units according to claim 1, characterized in that, The leveling and calibration component includes a support frame (14) installed inside the mounting base (4). A piston rod (15) is connected to the top of the support frame (14). A piston cylinder (9) is movably sleeved on the outside of the piston rod (15). A positioning bead (10) is provided at the top of the piston cylinder (9) and contacts the top of the inner wall of the locking cover (3). A guide hole (21) is opened at the top of the piston rod (15) and extends to the bottom of the piston rod (15). A second connecting pipe (29) is connected to the bottom of the piston rod (15). The annular... The interior of the water storage tank (12) is provided with a first connecting pipe (19) extending to the outside of the annular water storage tank (12). One end of the second connecting pipe (29) is equipped with a barrier chamber (18) connected to the first connecting pipe (19). The bottom of the inner wall of the piston cylinder (9) is provided with a first telescopic spring (22) connected to the piston rod (15). The inner side of the annular water storage tank (12) is slidably connected with a piston plate (17). The top of the piston plate (17) is provided with a spring piece (16) connected to the inner wall of the annular water storage tank (12).

3. A high-reliability voltage transformer for ring main units according to claim 2, characterized in that, The leveling and calibration component also includes a movable plug (23) that is slidably connected to the inside of the barrier chamber (18). The movable plug (23) is provided with a U-shaped push rod (20) extending to the outside of the barrier chamber (18). One side of the U-shaped push rod (20) is rotatably connected to a threaded rod (28) extending to the outside of the mounting base (4) via a bearing. The mounting base (4) is provided with a threaded hole that matches the threaded rod (28). The outer wall of the locking cover (3) is provided with a limiting unit located outside the threaded rod (28).

4. A high-reliability voltage transformer for ring main units according to claim 3, characterized in that, The inner wall of the retaining ring (8) is provided with an anti-slip pad that contacts the ball shaft (7), thereby increasing the resistance between the ball shaft (7) and the retaining ring (8).

5. A high-reliability voltage transformer for ring main units according to claim 3, characterized in that, The number of the support frame (14), piston rod (15) and piston cylinder (9) is four. The four support frames (14) are divided into two groups. Each group of support frames (14) is symmetrically arranged along the transverse central axis of the mounting base (4). The two support frames (14) in each group are symmetrically arranged along the transverse central axis of the mounting base (4). The blocking chamber (18) on one side of the adjacent support frame (14) in each group has the same protrusion direction relative to the first connecting pipe (19) and the second connecting pipe (29).

6. A high-reliability voltage transformer for ring main units according to claim 3, characterized in that, The movable plug (23) is provided with a connecting rod (13) that extends through to the outside of the barrier chamber (18) on the side away from the U-shaped push rod (20). The movable plugs (23) on the inner side of adjacent barrier chambers (18) are connected by the connecting rod (13).

7. A high-reliability voltage transformer for ring main units according to claim 3, characterized in that, The barrier chamber (18) has a through hole on the side that contacts the first connecting pipe (19) and the second connecting pipe (29) with the same diameter as the outer wall of the first connecting pipe (19) and the second connecting pipe (29). The diameter of the movable plug (23) is larger than the inner wall diameter of the first connecting pipe (19) and the second connecting pipe (29).

8. A high-reliability voltage transformer for ring main units according to claim 3, characterized in that, The limiting unit includes a protective ring (5) installed on the outer wall of the mounting base (4) and located outside the threaded screw (28). A limiting block (25) is installed on the outer wall of the protective ring (5). A movable frame (31) is inserted into the limiting block (25). A baffle (24) is installed on one side of the movable frame (31). A limiting plate (27) is provided at one end of the movable frame (31). A second telescopic spring (26) connected to the outer wall of the protective ring (5) is provided on one side of the limiting plate (27).

9. A high-reliability voltage transformer for a ring main unit according to claim 8, characterized in that, The inner diameter of the protective ring (5) is greater than the maximum diameter of the threaded rod (28), and the center of the protective ring (5) is coaxial with the center of the threaded rod (28).

10. A high-reliability voltage transformer for a ring main unit according to claim 8, characterized in that, The diameter of the baffle (24) is larger than the inner wall diameter of the protective ring (5), and the end of the baffle (24) near the movable frame (31) is in contact with the end of the protective ring (5) away from the mounting base (4).

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