A tap changer for a high voltage winding of a transformer

Abstract

The application relates to a tap switch for a high-voltage winding of a transformer applied in the field of electric switches, wherein a movable contact assembly is arranged to make the movable contact and the static contact adopt a vertical contact mode, instead of the sliding contact or rolling contact mode adopted by the movable contact and the static contact of the traditional tap switch, so as to reduce the friction between the movable contact and the static contact and the generated abrasion, and improve the service life of the contacts and the transformer oil; meanwhile, the elastic contact of the movable contact and the static contact is realized through the air bag installed on the contact side, instead of the spring limiting mechanism of the traditional contact, so as to solve the problem of the contact pressure drop caused by the spring softening under high temperature conditions, and improve the contact conductive effect; in addition, the insulating plate fixed with the bristles and the brush plate can reduce the arc generation probability, improve the cleanliness of the contact block, improve the conductive effect and prolong the service life of the contact block.

Description

Technical Field

[0001] This invention relates to a tap changer, and more particularly to a tap changer for use in the high-voltage winding of a transformer, applicable to the field of electrical switches. Background Technology

[0002] Transformer tap changers are key devices used to regulate the output voltage of transformers, achieving voltage adjustment by changing the winding turns ratio. In high-voltage transformers, oil-immersed on-load tap changers (OLTCs) are widely used due to their combination of load switching capability and oil dielectric insulation characteristics. The contact switching mechanism of their tap selector directly affects the reliability and service life of the equipment. Existing tap changer switching methods between moving and stationary contacts are mainly divided into two categories: sliding friction and rolling friction. Sliding friction contacts complete the tap switching through planar or arc-shaped contact sliding, but frequent operation leads to significant frictional losses, and the generated metal shavings easily contaminate the transformer oil, accelerating contact galvanic corrosion and reducing insulation performance. Rolling friction contacts adopt a roller-like structure design, which can reduce direct wear through rolling, but the reduced effective contact area leads to increased contact resistance and decreased conductivity. At the same time, the mechanical fatigue of the rolling elements may also affect long-term stability.

[0003] The existing patent with publication number CN202996615U discloses a rolling moving contact assembly of a combined on-load tap changer selector. By adopting a moving contact assembly bracket fixedly connected to the central shaft, symmetrically suspended upper and lower support plates, and an upper and lower rolling moving contact structure mounted on them, the moving contact holds a conductive ring on the inner side and a plate-shaped stationary contact on the outer side, and rolls between the ring-shaped stationary contacts to achieve the effect of converting traditional sliding friction into rolling friction. This reduces frictional resistance, reduces contact wear and oil medium contamination, and ultimately adapts to the low friction and high reliability requirements of dry-type combined on-load tap changer selectors.

[0004] The existing patent with publication number CN116490946B discloses a contact unit and contact system for an on-load tap changer, as well as an on-load tap changer, including a connector body and a contact holder coupled to each other, wherein the connector body is configured to connect the contact holder to the contacts of the on-load tap changer, the contact unit further includes a contact element coupled to the contact holder and configured to make electrical contact with a contact element of a contact device for an on-load tap changer, and the contact unit further includes a drive and guide device coupled to the contact holder.

[0005] The aforementioned prior art discloses a rolling contact structure, which reduces the wear of the moving and stationary contacts, but it does not resolve the contradiction between contact switching wear and conductivity efficiency. Summary of the Invention

[0006] The technical problem that this invention aims to solve in view of the above-mentioned prior art is the contradiction between contact wear and conductivity efficiency in tap changers.

[0007] To solve the above problems, the present invention provides a tap changer for a transformer high-voltage winding, including a switch body, the switch body including a switching switch and a tap selector, the tap selector including an insulating cylinder, a plurality of vertically equidistantly distributed output conductive rings fixedly connected to the inner wall of the insulating cylinder, a stationary contact 1 extending to the outside of the insulating cylinder fixedly connected to the lower end of the output conductive rings, a plurality of stationary contacts 2 fixedly connected to the insulating cylinder and extending to the outside of the insulating cylinder below the stationary contacts 1, a moving contact assembly for realizing the connection and disconnection between the stationary contacts 2 and the output conductive rings, the moving contact assembly being fixedly connected to a central shaft; The moving contact assembly includes a fixed ring fixedly connected to the outer wall of the central shaft, a slide rail fixedly connected to the outer wall of the fixed ring, a guide plate fixedly connected to the outer end of the slide rail away from the fixed ring, a pair of lifting blocks slidably connected to the guide plate, a lifting frame slidably connected to the outer end of the lifting blocks, a contact block fixedly connected to the outer end of the lifting frame, and a conductive sheet fixedly connected between the pair of contact blocks; the conductive sheet passes through a movable frame slidably connected to the slide rail, and a pair of connecting rods are hinged to the outer wall of the movable frame on the side facing the guide plate, with the outer ends of the connecting rods hinged to the outer wall of the lifting blocks; A traction rod that passes through the guide plate is fixedly connected to the outer wall of the movable frame facing the guide plate. A guide ring is slidably sleeved on the outside of the traction rod. The guide ring has a guide groove for the traction rod to slide. The guide groove causes the traction rod to move radially when it moves to the relative position of the two stationary contacts.

[0008] In the aforementioned tap changer for a transformer high-voltage winding, a mechanical transmission mechanism including a traction rod, a moving frame, and a connecting rod is used to achieve vertical contact between the moving and stationary contacts, thereby reducing contact wear.

[0009] As a further improvement of this application, the lifting frame includes a fixed frame that is fixedly wrapped around the outer side of the inner end of the contact block and a piston column that is fixedly connected to the fixed frame. The lifting block has a vertical cavity for the piston column to slide vertically. An air bladder is fixedly connected inside the vertical cavity, and the air bladder abuts against the inner end of the piston column.

[0010] As a further improvement of this application, a pair of oppositely arranged insulating plates are provided on the outer side of the movable frame, and a movable frame is fixedly connected between the pair of insulating plates. The movable frame is laterally slidably connected to the slide frame. The movable frame is slidably engaged with a double eccentric disk that is rotatably connected to the slide frame. A rotating shaft is fixedly connected between the double eccentric disks. A driven gear is fixedly connected on the rotating shaft. The driven gear meshes with a rack. The rack is fixedly connected to the outer wall of the movable frame on the side away from the connecting rod.

[0011] As a further improvement of this application, uniformly distributed bristles are fixedly connected to the inner walls of opposite sides of a pair of insulating plates.

[0012] As a further improvement of this application, a ball head is fixedly connected to the outer end of the traction rod. The guide groove includes an annular groove opened inside the guide ring and a circular groove with a circular cross-section that communicates with the annular groove. The ball head is slidably nested in the circular groove. The circular groove includes multiple V-shaped grooves that are opposite to the two stationary contacts. Adjacent V-shaped grooves are connected by arc grooves. The middle part of the arc groove is provided with a wave groove. The radial width of the wave groove is less than half of the radial width of the V-shaped groove.

[0013] As a further improvement of this application, a vertical sliding groove is provided on the outer wall of the guide plate facing the moving frame, the lifting block slides against the vertical sliding groove, and a through hole is provided on the guide plate for the traction rod to slide through.

[0014] As a further improvement of this application, the slide frame is provided with a through groove, and a pair of opposing inner slide grooves are provided on the inner wall of the through groove. The movable frame slides against the inner wall of the through groove, and a slider is fixedly connected to the outer wall of the front and rear ends of the movable frame. The slider is slidably nested in the inner slide groove.

[0015] As a further improvement of this application, the movable frame is a rectangular frame, which slides against the inner wall of the through groove. A second slider is fixedly connected to the outer wall of the movable frame, and the second slider is slidably nested in the inner groove. A pair of vertically arranged grooves are opened on the inner wall of the movable frame. The double eccentric disk includes a pair of eccentric disks that slide against the inner wall of the movable frame. The eccentric disks are fixedly connected to each other by a rotating shaft. An eccentric column is fixedly connected to the eccentric disk, and the eccentric column is slidably nested in the vertical groove. A fixed frame is rotatably connected to the rotating shaft. The fixed frame is sleeved on the outside of the driven gear and fixedly connected to the inner wall of the through groove.

[0016] As a further improvement of this application, a pair of brush plates are fixedly connected to the outer wall of the fixed ring on the side away from the moving contact assembly. The brush plates are used to brush the output conductive ring and the stationary contact.

[0017] In summary, this invention, by incorporating a moving contact assembly and utilizing a mechanical transmission mechanism including a traction rod, guide ring, moving frame, and connecting rod, enables the moving contact and stationary contact to make vertical contact, replacing the sliding or rolling contact method used in traditional tap changers. This reduces friction between the moving and stationary contacts and the resulting wear debris, thus improving the service life of the contacts and transformer oil. Simultaneously, by replacing the spring-limiting mechanism of traditional contacts with the mechanical transmission mechanism including the traction rod, guide ring, moving frame, and connecting rod, the problem of reduced contact pressure caused by spring softening under high-temperature conditions is solved, improving contact performance and consequently enhancing conductivity. Furthermore, by fixing an insulating plate with bristles and a brush plate, the probability of arc generation is reduced while improving the cleanliness of the contact block, further enhancing conductivity and extending the service life of the contact block. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present application; Figure 2 This is a schematic diagram of the internal structure of the tap selector in this application; Figure 3 This is a cross-sectional view of the tap selector in this application; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a three-dimensional structural diagram of the moving contact assembly in this application; Figure 6 This is a schematic diagram of the exploded assembly structure of the movable frame and contact block in this application; Figure 7 This is a schematic diagram of the exploded assembly structure of the insulating plate and the slide frame in this application; Figure 8 This is a partial cross-sectional view of the guide ring in this application; Figure 9 This is a schematic diagram of the horizontal cross-sectional structure of the guide ring in this application; Figure 10 This is a schematic diagram of the movement state of the moving contact assembly when it is turned on in this application; Figure 11 This is a schematic diagram showing the motion state of the insulating plate in this application; Figure 12 This is a schematic diagram of the motion state of the brush plate in this application.

[0019] Explanation of the labels in the diagram: 1. Changeover switch; 2. Tap selector; 3. Insulating cylinder; 4. Output conductive ring; 5. Stationary contact one; 6. Stationary contact two; 7. Central shaft; 8. Moving contact assembly; 9. Slide rail frame; 901. Through slot; 902. Inner slide rail; 10. Guide plate; 1001. Vertical slide rail; 11. Lifting block; 12. Lifting frame; 1201. Fixed frame; 1202. Piston column; 13. Contact block; 14. Conductive sheet; 15. Connecting rod; 16. Moving frame; 1601. Slider one; 17. Traction rod; 1701. Ball head; 18. Guide ring; 1801. Annular groove; 1802. Circular groove; 1803. Arc groove; 1804. V-shaped groove; 1805. Wave groove; 19. Fixing ring; 20. Airbag; 21. Insulating plate; 2101. Brush bristles; 22. Moving frame; 2201. Vertical groove; 2202. Slider II; 23. Double eccentric disc; 24. Rotating shaft; 25. Driven gear; 26. Rack; 27. Fixing frame; 28. Brush plate. Detailed Implementation

[0020] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0021] Implementation method 1: Figures 1-9 A tap changer for a transformer high-voltage winding is shown, including a switch body, a switching switch 1 and a tap selector 2. The tap selector 2 includes an insulating cylinder 3. Multiple vertically equidistant output conductive rings 4 are fixedly connected to the inner wall of the insulating cylinder 3. A stationary contact 5 extending to the outside of the insulating cylinder 3 is fixedly connected to the lower end of the output conductive rings 4. Multiple stationary contacts 6 fixedly connected to the insulating cylinder 3 and extending to the outside of the insulating cylinder 3 are provided below the stationary contacts 5. A moving contact assembly 8 is provided between the stationary contacts 6 and the output conductive rings 4 to realize the connection and disconnection between the two. The moving contact assembly 8 is fixedly connected to a central shaft 7. The central shaft 7 drives the moving contact assembly 8 to perform circular motion. Please see Figures 4-6 The moving contact assembly 8 includes a fixed ring 19 fixedly connected to the outer wall of the central shaft 7. A slide rail 9 is fixedly connected to the outer wall of the fixed ring 19. A guide plate 10 is fixedly connected to the outer end of the slide rail 9 away from the fixed ring 19. A pair of lifting blocks 11 are slidably connected to the guide plate 10. A lifting frame 12 is slidably connected to the outer end of the lifting block 11. A contact block 13 is fixedly connected to the outer end of the lifting frame 12. A conductive sheet 14 is fixedly connected between the pair of contact blocks 13. A movable frame 16 slidably connected to the slide rail 9 passes through the conductive sheet 14. A pair of connecting rods 15 are hinged to the outer wall of the movable frame 16 on the side facing the guide plate 10. The outer ends of the connecting rods 15 are hinged to the outer wall of the lifting block 11. Please see Figures 4-6 A traction rod 17 that penetrates the guide plate 10 is fixedly connected to the outer wall of the movable frame 16 facing the guide plate 10. A guide ring 18 is slidably sleeved on the outside of the traction rod 17. The guide ring 18 has a guide groove for the traction rod 17 to slide. The guide groove causes the traction rod 17 to move radially when it moves to the relative position of the stationary contact 2 6. For more specific details, please refer to Figure 10 and Figure 11When the central shaft 7 drives the moving contact assembly 8 to perform a circular motion, the traction rod 17 slides in the guide groove. The guide groove causes the traction rod 17 to move radially outward when it reaches the position of the stationary contact 6. The traction rod 17 then drives the moving frame 16 to move outward along the slide frame 9. The slide frame 9, through a pair of connecting rods 15, drives a pair of lifting blocks 11 to move away from each other along the guide plate 10. The lifting blocks 11 drive the lifting frame 12 and the contact block 13 on them to move vertically, thus adjusting the position... The upper contact block 13 abuts against the output conductive ring 4, while the lower contact block 13 abuts against the stationary contact 6. At this time, the stationary contact 6 is connected to the stationary contact 5 through the lower contact block 13, the conductive sheet 14, the upper contact block 13, the output conductive ring 4. It should be noted that the stationary contact 5 is connected to the transformer's lead cable, and the stationary contact 6 is connected to the winding tap of the transformer's high-voltage winding. The wiring method of the tap changer is existing technology and will not be described in detail in this application.

[0022] Compared to traditional tap changers, this invention, by incorporating a moving contact assembly 8 and utilizing a mechanical transmission mechanism including a traction rod 17, a guide ring 18, a moving frame 16, and a connecting rod 15, enables the moving contact and stationary contact to make vertical contact, replacing the sliding or rolling contact method used in traditional tap changers. This reduces friction between the moving and stationary contacts and the resulting wear debris, thus improving the service life of the contacts and transformer oil. Simultaneously, the mechanical transmission mechanism, including the traction rod 17, guide ring 18, moving frame 16, and connecting rod 15, replaces the spring-limiting mechanism of traditional contacts, solving the problem of reduced contact pressure caused by spring softening under high-temperature conditions, improving contact performance, and consequently enhancing conductivity.

[0023] Please see Figure 4 , Figure 8 and Figure 9 The outer end of the traction rod 17 is fixedly connected to a ball head 1701. The guide groove includes an annular groove 1801 opened inside the guide ring 18 and a circular groove 1802 connected to the annular groove 1801 and having a circular cross-section. The ball head 1701 is slidably nested in the circular groove 1802. The circular groove 1802 includes a plurality of V-shaped grooves 1804 arranged opposite to the stationary contact 6. Adjacent V-shaped grooves 1804 are connected by an arc groove 1803.

[0024] Specifically, when the ball head 1701 slides through the V-groove 1804, the traction rod 17 moves radially back and forth. During this process, the traction rod 17 drives the moving frame 16 to move laterally back and forth within the slide frame 9. The moving frame 16 drives the lifting block 11 and the contact block 13 mounted on it to move vertically back and forth through the connecting rod 15, realizing the contact and disengagement of a pair of contact blocks 13 with the output conductive ring 4 and the stationary contact 6. At the same time, as the central shaft 7 drives the moving contact assembly 8 to move in a circular motion, the ball head 1701 moves through the arc groove 1803 to the next V-groove 1804, realizing the contact and disengagement of the moving contact assembly 8 with each stationary contact 6 that is circumferentially distributed, thereby realizing the switching of different windings. In addition, when the ball head 1701 is located in the arc groove 1803, the contact block 13 is furthest away from the output conductive ring 4 or the stationary contact 6.

[0025] Please see Figure 4 and Figure 7 The slide frame 9 has a through groove 901, and a pair of opposing inner slide grooves 902 are provided on the inner wall of the through groove 901. The movable frame 16 slides against the inner wall of the through groove 901. A slider 1601 is fixedly connected to the outer wall of the front and rear ends of the movable frame 16, and the slider 1601 slides and is nested in the inner slide groove 902.

[0026] Specifically, by providing a slider 1601, the movable frame 16 has better stability when sliding radially within the slide rail 9, thereby improving the movement stability of the movable frame 16.

[0027] Please see Figure 4 and Figure 5 A vertical slide groove 1001 is provided on the outer wall of the guide plate 10 facing the movable frame 16. The lifting block 11 slides against the vertical slide groove 1001. A through hole is provided on the guide plate 10 for the traction rod 17 to slide through.

[0028] Specifically, the guide plate 10 with a vertical slide groove 1001 is used to vertically limit the lifting block 11, improve the stability of the lifting block 11 and its contact block 13 when moving vertically, and provide support for the traction rod 17 through the guide plate 10.

[0029] Please see Figure 4 and Figure 6 The lifting frame 12 includes a fixed frame 1201 that is fixedly wrapped around the outer side of the inner end of the contact block 13 and a piston column 1202 that is fixedly connected to the fixed frame 1201. The lifting block 11 has a vertical cavity for the piston column 1202 to slide vertically. An air bag 20 is fixedly connected in the vertical cavity, and the air bag 20 abuts against the inner end of the piston column 1202.

[0030] Specifically, by providing an air bladder 20, the contact block 13 installed on the lifting frame 12 maintains elastic contact with the output conductive ring 4 or the stationary contact 6, further reducing the compression wear of the contact block 13. In addition, when the transformer oil heats up, the air bladder 20 expands, increasing the contact pressure between the contact block 13 and the output conductive ring 4 or the stationary contact 6.

[0031] The second implementation method: Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 9 A tap changer for a transformer high-voltage winding is shown. Based on the first embodiment, a pair of oppositely arranged insulating plates 21 are provided on the outer side of the movable frame 16. A movable frame 22 is fixedly connected between the pair of insulating plates 21. The movable frame 22 is laterally slidably connected to the slide frame 9. A double eccentric disk 23 slidably engages with the movable frame 22 and is rotatably connected to the slide frame 9. A rotating shaft 24 is fixedly connected between the double eccentric disks 23. A driven gear 25 is fixedly connected to the rotating shaft 24. The driven gear 25 meshes with a rack 26. The rack 26 is fixedly connected to the outer wall of the movable frame 16 on the side away from the connecting rod 15.

[0032] Specifically, when the traction rod 17 moves the moving frame 16 away from the guide plate 10, the moving frame 16, through the connecting rod 15, drives the lifting block 11 and the contact block 13 on it to disengage from the output conductive ring 4 and the stationary contact 6. At the same time, the moving frame 16 drives the driven gear 25 to rotate through the rack 26. The driven gear 25 drives the double eccentric disk 23 to rotate through the rotating shaft 24. The double eccentric disk 23 drives the moving frame 22 to move towards the guide plate 10. The moving frame 22 drives the insulating plate 21 to move to the outside of the contact block 13, so that the insulating plate 21 is between the contact block 13 and the output conductive ring 4 or the stationary contact 6, thereby reducing the probability of the contact block 13 generating an electric arc after disengaging from the output conductive ring 4 or the stationary contact 6, and improving the isolation effect.

[0033] Please see Figure 5 and Figure 7 The movable frame 22 is a rectangular frame, and the movable frame 22 slides against the inner wall of the through groove 901. A second slider 2202 is fixedly connected to the outer wall of the movable frame 22, and the second slider 2202 is slidably nested in the inner groove 902. A pair of vertically arranged grooves 2201 are opened on the inner wall of the movable frame 22. The double eccentric disk 23 includes a pair of eccentric disks that slide against the inner wall of the movable frame 22. The eccentric disks are fixedly connected to each other by a rotating shaft 24. An eccentric column is fixedly connected to the eccentric disk, and the eccentric column is slidably nested in the vertical groove 2201. A fixed frame 27 is rotatably connected to the rotating shaft 24. The fixed frame 27 is sleeved on the outside of the driven gear 25 and fixedly connected to the inner wall of the through groove 901.

[0034] Specifically, the slider 2202 enables the moving frame 22 to slide stably laterally within the through groove 901, and the eccentric column on the eccentric disk drives the moving frame 22 to reciprocate within the through groove 901, thereby realizing the lateral reciprocating movement of the insulating plate 21.

[0035] Please see Figure 5 and Figure 9 A pair of insulating plates 21 have uniformly distributed bristles 2101 fixedly connected to the inner wall of opposite sides. The middle part of the arc groove 1803 is provided with a wave groove 1805. The radial width of the wave groove 1805 is less than half the radial width of the V-shaped groove 1804.

[0036] Specifically, as the ball head 1701 of the traction rod 17 passes through the wave groove 1805, the traction rod 17 drives the moving frame 16 to move radially back and forth within the slide frame 9. The moving frame 16 drives the driven gear 25 and the double eccentric disk 23 to rotate back and forth through the rack 26. The double eccentric disk 23 drives the moving frame 22 and the insulating plate 21 on it to move back and forth. The insulating plate 21 drives the bristles 2101 on it to repeatedly brush the contact surface of the contact block 13, thereby improving the cleanliness of the contact block 13 surface and improving the conductivity. It should be noted that when the ball head 1701 is located at the tip of the V-groove 1804, the contact block 13 is in contact with the output conductive ring 4 or the stationary contact 6, and the insulating plate 21 is furthest away from the contact block 13; when the ball head 1701 is located in the arc groove 1803, the contact block 13 is furthest away from the output conductive ring 4 or the stationary contact 6, and the insulating plate 21 is located outside the contact block 13 and at the outermost position; when the ball head 1701 moves in the wave groove 1805, the insulating plate 21 drives the bristles 2101 on it to repeatedly brush the surface of the contact block 13.

[0037] Please see Figure 3 and Figure 12 A pair of brush plates 28 are fixedly connected to the outer wall of the fixed ring 19 on the side away from the moving contact assembly 8. The brush plates 28 are used to brush the output conductive ring 4 and the stationary contact 6.

[0038] Specifically, the central shaft 7 drives the fixed ring 19 to rotate, and the fixed ring 19 drives a pair of brush plates 28 to make a circular motion, which rotates and brushes the contact surfaces of the output conductive ring 4 and the stationary contact 6.

[0039] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A tap changer for a transformer high-voltage winding, characterized in that, The switch body includes a switching switch (1) and a tap selector (2). The tap selector (2) includes an insulating cylinder (3). Multiple vertically equidistant output conductive rings (4) are fixedly connected to the inner wall of the insulating cylinder (3). A stationary contact 1 (5) extending to the outside of the insulating cylinder (3) is fixedly connected to the lower end of the output conductive ring (4). Multiple stationary contacts 2 (6) fixedly connected to the insulating cylinder (3) and extending to the outside of the insulating cylinder (3) are provided below the stationary contact 1 (5). A moving contact assembly (8) is provided between the stationary contact 2 (6) and the output conductive ring (4) to realize the connection and disconnection between the two. The moving contact assembly (8) is fixedly connected to the central shaft (7). The moving contact assembly (8) includes a fixed ring (19) fixedly connected to the outer wall of the central shaft (7), a slide frame (9) fixedly connected to the outer wall of the fixed ring (19), a guide plate (10) fixedly connected to the outer end of the slide frame (9) away from the fixed ring (19), a pair of lifting blocks (11) slidably connected to the guide plate (10), a lifting frame (12) slidably connected to the outer end of the lifting block (11), a contact block (13) fixedly connected to the outer end of the lifting frame (12), and a conductive sheet (14) fixedly connected between the pair of contact blocks (13); the conductive sheet (14) passes through a movable frame (16) slidably connected to the slide frame (9), a pair of connecting rods (15) are hinged to the outer wall of the movable frame (16) facing the guide plate (10), and the outer end of the connecting rod (15) is hinged to the outer wall of the lifting block (11); The movable frame (16) has a traction rod (17) that passes through the guide plate (10) fixedly connected to the outer wall of the side facing the guide plate (10). A guide ring (18) is slidably sleeved on the outside of the traction rod (17). The guide ring (18) has a guide groove for the traction rod (17) to slide. The guide groove causes the traction rod (17) that slides inside it to move radially when it moves to the relative position of the stationary contact two (6).

2. A tap changer for a transformer high-voltage winding according to claim 1, characterized in that, The lifting frame (12) includes a fixed frame (1201) that is fixedly wrapped around the inner side of the contact block (13) and a piston column (1202) that is fixedly connected to the fixed frame (1201). The lifting block (11) has a vertical cavity for the piston column (1202) to slide vertically. An air bag (20) is fixedly connected in the vertical cavity. The air bag (20) abuts against the inner end of the piston column (1202).

3. A tap changer for a transformer high-voltage winding according to claim 2, characterized in that, The movable frame (16) is provided with a pair of oppositely arranged insulating plates (21) on the outside. A movable frame (22) is fixedly connected between the pair of insulating plates (21). The movable frame (22) is slidably connected to the slide frame (9). The movable frame (22) is slidably engaged with a double eccentric disk (23) that is rotatably connected to the slide frame (9). A rotating shaft (24) is fixedly connected between the double eccentric disks (23). A driven gear (25) is fixedly connected on the rotating shaft (24). The driven gear (25) meshes with a rack (26). The rack (26) is fixedly connected to the outer wall of the movable frame (16) on the side away from the connecting rod (15).

4. A tap changer for a transformer high-voltage winding according to claim 3, characterized in that, Evenly distributed bristles (2101) are fixedly connected to the inner walls of opposite sides of a pair of insulating plates (21).

5. A tap changer for a transformer high-voltage winding according to claim 4, characterized in that, The outer end of the traction rod (17) is fixedly connected to a ball head (1701). The guide groove includes an annular groove (1801) opened inside the guide ring (18) and a circular groove (1802) connected to the annular groove (1801) and having a circular cross-section. The ball head (1701) is slidably nested in the circular groove (1802). The circular groove (1802) includes multiple V-shaped grooves (1804) arranged opposite to the stationary contact (6). Adjacent V-shaped grooves (1804) are connected by an arc groove (1803). The middle part of the arc groove (1803) is provided with a wave groove (1805). The radial width of the wave groove (1805) is less than half the radial width of the V-shaped groove (1804).

6. A tap changer for a transformer high-voltage winding according to claim 1, characterized in that, The guide plate (10) has a vertical slide groove (1001) on the outer wall facing the movable frame (16). The lifting block (11) slides against the vertical slide groove (1001). The guide plate (10) has a through hole for the traction rod (17) to slide through.

7. A tap changer for a transformer high-voltage winding according to claim 4, characterized in that, The slide frame (9) has a through groove (901), and a pair of opposing inner slide grooves (902) are provided on the inner wall of the through groove (901). The movable frame (16) slides against the inner wall of the through groove (901). A slider (1601) is fixedly connected to the outer wall of the front and rear ends of the movable frame (16), and the slider (1601) slides and is nested in the inner slide groove (902).

8. A tap changer for a transformer high-voltage winding according to claim 7, characterized in that, The movable frame (22) is a rectangular frame. The movable frame (22) slides against the inner wall of the through groove (901). A slider two (2202) is fixedly connected to the outer wall of the movable frame (22). The slider two (2202) slides and is nested in the inner groove (902). A pair of vertical grooves (2201) are opened on the inner wall of the movable frame (22). The double eccentric disk (23) includes a pair of eccentric disks that slide against the inner wall of the movable frame (22). The eccentric disks are fixedly connected by a rotating shaft (24). An eccentric column is fixedly connected to the eccentric disk. The eccentric column slides and is nested in the vertical groove (2201). The rotating shaft (24) is rotatably connected to a fixed frame (27). The fixed frame (27) is sleeved on the outside of the driven gear (25) and fixedly connected to the inner wall of the through groove (901).

9. A tap changer for a transformer high-voltage winding according to claim 4, characterized in that, A pair of brush plates (28) are fixedly connected to the outer wall of the fixed ring (19) away from the moving contact assembly (8). The brush plates (28) are used to brush the output conductive ring (4) and the stationary contact (6).

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