A combined connection type transformer for a booster station

Abstract

The utility model relates to a combined connection type transformer for booster station, relates to dry-type transformer technical field, including the transformer box, the hinged box door of transformer box open end is equipped with, is equipped with the accommodation groove in the bottom of transformer box, is equipped with the U type base with horizontal sliding connection in the accommodation groove, two lower clamping pieces are detachably equipped with in the top of U type base, is equipped with the lower iron yoke with detachable connection between two lower clamping pieces, two upper clamping pieces are equipped with above U type base, are equipped with the upper iron yoke with detachable connection between two upper clamping pieces, the upper iron yoke is inserted with lower iron yoke, is fixedly equipped with the support plate in the top of four corners of U type base, is fixedly equipped with the fixed plate in the top of support plate, the outer wall of fixed plate is sleeved with the lifting round plate with vertical sliding connection, is fixedly equipped with the fixed cylinder in the top of lifting round plate, a plurality of installation grooves are evenly distributed and are equipped with in the fixed cylinder outer wall along the circumference and are equipped with in the fixed cylinder, the utility model has solved the problem of the existing dry-type transformer winding repair process complicated, the problem of the complex process of dismounting.

Description

Technical Field

[0001] This invention relates to the field of dry-type transformer technology, specifically to a combined-connection step-up transformer for substations. Background Technology

[0002] A dry-type transformer is a power transformer that does not use liquid insulating media (such as oil) but relies on air, epoxy resin or other solid materials for insulation and heat dissipation. Its core structure consists of an iron core and windings. The windings are usually wrapped in high-temperature resistant insulating materials by vacuum pressure impregnation or casting process. It has advantages such as fire resistance, explosion resistance and environmental protection. It has low noise during operation and is suitable for places with high safety requirements, such as indoor substations and high-rise buildings.

[0003] Existing dry-type transformers have gradually revealed their shortcomings during use, mainly in the following aspects:

[0004] First, the winding disassembly and repair process is cumbersome. Specifically, existing dry-type transformers use a core structure composed of upper and lower yokes, both made of multiple layers of silicon steel sheets. When assembling a dry-type transformer, the high and low voltage windings must first be fitted onto the lower yoke. Then, silicon steel sheets are inserted one by one into the opening at the top of the lower yoke to form the upper yoke. To enhance the overall mechanical strength of the core and prevent the connection between the upper and lower yokes from loosening due to vibrations generated during the operation of the dry-type transformer, the silicon steel sheets of the upper yoke and the lower yoke are installed using an alternating insertion process. This assembly process must be completed manually, piece by piece. After all the silicon steel sheets are inserted and fixed in place, the overall assembly of the dry-type transformer is completed. During long-term operation, the insulation material between the windings of a dry-type transformer is continuously subjected to multiple factors such as electrical stress, thermal aging, and mechanical vibration, which can lead to insulation performance deterioration and short-circuit risks. Therefore, it is necessary to disassemble and repair it regularly. Since the upper and lower yokes of the core use an alternating stacked structure, the repair process requires disassembling one by one in reverse order. After the repair is completed, the above assembly process is repeated. Therefore, the entire maintenance process is complex, time-consuming, and labor-intensive, affecting maintenance efficiency.

[0005] Secondly, the process of dismantling and relocating dry-type transformers is complicated. Specifically, existing dry-type transformers are usually installed in sealed transformer boxes to reduce the impact of dust. Their fixed installation method means that during maintenance, the fixed connection between the transformer and the box must be disconnected first, and then heavy equipment such as forklifts must be used to move the entire transformer out of the box before subsequent maintenance work can be carried out. This dismantling and relocation process involves the operation of large equipment and is complicated, which significantly increases the difficulty of maintenance.

[0006] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a combined-connection type transformer for step-up substations. The upper and lower yokes of this dry-type transformer core are integrated structures. During core assembly, the upper yoke can be quickly and accurately inserted into the lower yoke, and the inserted upper yoke is restrained, effectively preventing loosening at the connection point between the upper and lower yokes during operation, thus improving the stability of the core structure. Furthermore, during core disassembly, the upper and lower yokes can be quickly separated, significantly simplifying the core disassembly process during dry-type transformer winding repair and maintenance, thereby improving maintenance efficiency.

[0008] This dry-type transformer features a movable installation design, allowing it to be quickly moved outside the transformer enclosure for maintenance without disconnecting from the transformer box. This simplifies the transformer relocation process and improves the ease of transformer maintenance.

[0009] To address the above problems, the present invention provides the following technical solution:

[0010] A combined-connection type step-up transformer for substations includes a transformer box with a hinged door at its open end. A receiving groove extends through the bottom of the transformer box, and a U-shaped base is horizontally slidably connected to the transformer box within the receiving groove. Two lower clamps are detachably mounted on the top of the U-shaped base, and a lower yoke is detachably connected between the two lower clamps. Two upper clamps are mounted above the U-shaped base, and an upper yoke is detachably connected between the two upper clamps. The upper yoke is inserted into the lower yoke. Support plates are fixed at the four corners of the top of the U-shaped base. The support plate is fixedly provided with a fixed plate at the top. The outer wall of the fixed plate is fitted with a lifting circular plate that is vertically slidably connected to it. The top of the lifting circular plate is fixedly provided with a fixed cylinder. The outer wall of the fixed cylinder is evenly distributed with several through-holes along the circumference. The mounting groove is provided with a sliding plate that is horizontally slidably connected to the fixed cylinder. Several insert plates are fixedly provided at the end of the sliding plate. The end of the upper clamp is provided with two detachable connecting cylinders. The connecting cylinder is sleeved on the outside of the fixed cylinder and abuts against the lifting circular plate. The inner wall of the connecting cylinder is provided with several slots. The insert plates are inserted into the slots.

[0011] When the lifting circular plate slides downward, the upper yoke moves downward, and at the same time, the sliding plate slides outward. The insert plate contacts the connecting cylinder and adjusts the position of the upper yoke. When the upper yoke and the lower yoke are inserted, the insert plate is inserted into the slot and limits the upper yoke to prevent the connection between the upper yoke and the lower yoke from loosening.

[0012] As an optimized solution, both the upper and lower yokes are composed of several silicon steel sheets. The silicon steel sheets in the lower yoke have V-shaped grooves at the top, and the silicon steel sheets in the upper yoke are shaped to fit the bottom.

[0013] As an optimized solution, both the upper and lower clamps are detachably connected to the silicon steel sheets by fixing bolts, and the upper ends of several silicon steel sheets in the lower yoke are tightened and fixed by tightening bolts.

[0014] As an optimized solution, the bottom of the U-shaped base is fixedly equipped with several casters, and the inner wall of the receiving groove is fixedly equipped with two drive telescopic cylinders, the telescopic ends of which are fixedly connected to the U-shaped base.

[0015] As an optimized solution, three low-voltage windings are sleeved on the outer side of the lower yoke, and high-voltage windings are sleeved on the outer side of the low-voltage windings. Several detachable pads are provided at the bottom of the upper clamp and the top of the lower clamp. The top and bottom of the high-voltage winding and the low-voltage winding abut against the pads.

[0016] As an optimized solution, one of the upper clamps is equipped with several high-voltage terminals on its top, and the high-voltage terminals are connected to the high-voltage winding through a high-voltage connecting rod. Several lifting rings are fixedly provided on the top of the upper clamp.

[0017] As an optimized solution, the upper end of the fixed plate is detachably provided with a plurality of fixed wedge blocks, and the end of the sliding plate is detachably provided with a driven wedge block, wherein the inclined end of the fixed wedge block is slidably connected to the inclined end of the driven wedge block.

[0018] As an optimized solution, the upper interior and lower interior of the support plate are respectively provided with an upper internal groove and a lower internal groove. The upper internal groove is provided with a lifting plate that is vertically slidably connected to the support plate. Several connecting rods are fixedly provided on the top of the lifting plate. The top of the connecting rods extends upward to the outside and is fixedly connected to the lifting circular plate. The connecting rods are slidably connected to the support plate.

[0019] As an optimized solution, the bottom of the upper built-in groove is provided with a rotating shaft, the top of the rotating shaft passes through the lifting plate and is rotatably connected to the support plate, the outer wall of the rotating shaft is provided with a lead screw section, and the lifting plate is threadedly connected to the lead screw section on the rotating shaft.

[0020] As an optimized solution, a built-in motor is fixedly installed at the top of the lower built-in slot, and the bottom end of the rotating shaft extends downward and is fixedly connected to the output shaft of the built-in motor.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. When the transformer is moved out, the box door is opened, and the telescopic cylinder is driven to slide the U-shaped base outward, thereby moving the transformer to the outside of the transformer box. The casters provide support for the U-shaped base and facilitate the pushing out of the U-shaped base. This dry-type transformer adopts a movable installation design, which can be quickly moved to the outside of the box for maintenance without disconnecting from the transformer box, simplifying the transformer transfer process and improving the convenience of transformer maintenance.

[0023] 2. When the U-shaped base is located inside the transformer box, one end of the U-shaped base abuts against the inner wall of the transformer box. When the box door is closed, the box door seals the opening end of the transformer box, and the box door abuts against the other end of the U-shaped base. The opposite side walls of the U-shaped base are slidably connected to the transformer box. Therefore, the inside of the transformer box is a closed space, which can reduce the entry of dust. This transformer is not only easy to remove for maintenance, but also has an excellent sealing effect, which improves its practicality.

[0024] 3. When disassembling and repairing the high-voltage and low-voltage windings, first remove the high-voltage connecting rod. Then, the built-in motor drives the rotating shaft to rotate, which in turn drives the lifting plate to slide upward. Under the drive of the connecting rod, the lifting circular plate, the fixed cylinder, and the connecting cylinder move upward, which in turn drives the upper yoke to move upward and separate from the lower yoke. When the lifting circular plate moves upward, the driven wedge block drives the sliding plate to slide inward, and the insert plate disengages from the slot, thus releasing the restriction on the connecting cylinder. At this time, use equipment such as an overhead crane to lift the upper yoke with lifting rings. Then, lift the high-voltage and low-voltage windings out for repair in sequence. After the repair is completed, lift the high-voltage and low-voltage windings onto the lower yoke in sequence. Then, lift the upper yoke so that the connecting cylinder is sleeved on the outside of the fixed cylinder and abuts against the lifting circular plate. The built-in motor drives the lifting circular plate to slide downward, and the upper yoke moves downward. The sliding plate moves outwards, and the insert plate contacts the connecting cylinder to adjust the position of the upper yoke. This prevents the bottom tip of the silicon steel sheet in the upper yoke from colliding with the silicon steel sheet in the lower yoke during the insertion process, thus preventing damage. When the upper and lower yokes are inserted, the insert plate is inserted into the slot and limits the upper yoke to prevent loosening at the connection between the upper and lower yokes. The upper and lower yokes of the transformer core are integrated structures. When assembling the core, the upper yoke can be quickly and accurately inserted with the lower yoke, and the inserted upper yoke is limited, effectively preventing loosening at the connection between the upper and lower yokes during operation, thus improving the stability of the core structure. When disassembling the core, the upper and lower yokes can be quickly separated, greatly simplifying the core disassembly process during the disassembly and repair of dry-type transformer windings and improving maintenance efficiency.

[0025] 4. The pads on the upper and lower clamps can better clamp and limit the high-voltage and low-voltage windings, and the pads on the lower clamps can facilitate the passing of the lifting rope through the high-voltage and low-voltage windings, improving the convenience of the lifting process. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the transformer box of the present invention;

[0029] Figure 3 This is a schematic diagram of the upper and lower iron yokes of the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of the support plate of the present invention;

[0031] Figure 5 This is a schematic diagram of the internal structure of the fixing cylinder of the present invention;

[0032] Figure 6 This is a schematic diagram of the silicon steel sheet structure of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the bottom of the U-shaped base of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure between the upper clamp and the lower clamp of the present invention;

[0035] Figure 9 This is a schematic diagram of the structure of the fixed wedge block of the present invention;

[0036] Figure 10 This is a schematic diagram of the driven wedge block of the present invention.

[0037] In the diagram: 1-Transformer box; 2-Box door; 3-Receiving slot; 4-U-shaped base; 5-Lower clamp; 6-Support plate; 7-Upper clamp; 8-Lifting ring; 9-Connecting cylinder; 10-High voltage terminal; 11-High voltage winding; 12-Low voltage winding; 13-High voltage connecting rod; 14-Padded block; 15-Lower yoke; 16-Upper yoke; 17-Fixing bolt; 18-Tightening bolt; 19-Silicon steel sheet; 20-V-groove; 21-Built-in motor; 22-Rotating shaft; 23-Lifting plate; 24-Screw section; 25-Connecting rod; 26-Lifting circular plate; 27-Fixing cylinder; 28-Fixing plate; 29-Upper built-in groove; 30-Lower built-in groove; 31-Insert plate; 32-Sliding plate; 33-Driven wedge block; 34-Fixing wedge block; 35-Slot; 36-Mounting groove; 37-Cast wheel; 38-Drive telescopic cylinder. Detailed Implementation

[0038] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0039] like Figures 1 to 10 As shown, a combined-connection type step-up transformer for a substation includes a transformer box 1. A door 2 is hinged to the open end of the transformer box 1. A receiving groove 3 extends through the bottom of the transformer box 1. A U-shaped base 4, horizontally slidably connected to the transformer box 1, is located within the receiving groove 3. Two lower clamps 5 are detachably mounted on the top of the U-shaped base 4, and a lower yoke 15 is detachably connected between the two lower clamps 5. Two upper clamps 7 are located above the U-shaped base 4, and an upper yoke 16, detachably connected between the two upper clamps 7, is inserted into the lower yoke 15. Support plates 6 are fixed at the four corners of the top of the U-shaped base 4. A fixed plate 28 is fixedly provided at the top. A lifting circular plate 26 is fitted on the outer wall of the fixed plate 28 and slidably connected to it vertically. A fixed cylinder 27 is fixedly provided at the top of the lifting circular plate 26. Several through-mounting grooves 36 are evenly distributed along the circumference of the outer wall of the fixed cylinder 27. A sliding plate 32 is provided in the mounting groove 36 and slidably connected to the fixed cylinder 27 horizontally. Several insert plates 31 are fixedly provided at the ends of the sliding plate 32. Two detachable connecting cylinders 9 are provided at the ends of the upper clamp 7. The connecting cylinders 9 are fitted on the outside of the fixed cylinder 27 and abut against the lifting circular plate 26. Several slots 35 are provided on the inner wall of the connecting cylinders 9. The insert plates 31 are inserted into the slots 35.

[0040] When the lifting circular plate 26 slides downward, the upper yoke 16 moves downward, and at the same time the sliding plate 32 slides outward. The insert plate 31 contacts the connecting cylinder 9 and adjusts the position of the upper yoke 16. When the upper yoke 16 and the lower yoke 15 are inserted, the insert plate 31 is inserted into the slot 35 and limits the upper yoke 16 to prevent the connection between the upper yoke 16 and the lower yoke 15 from loosening.

[0041] Both the upper yoke 16 and the lower yoke 15 are composed of several silicon steel sheets 19. The silicon steel sheets 19 in the lower yoke 15 are provided with a V-shaped groove 20 at the top, and the silicon steel sheets 19 in the upper yoke 16 are arranged to follow the shape at the bottom.

[0042] Both the upper clamp 7 and the lower clamp 5 are detachably connected to the silicon steel sheet 19 by fixing bolts 17, and the upper ends of several silicon steel sheets 19 in the lower yoke 15 are tightened and fixed by tightening bolts 18.

[0043] Several casters 37 are fixedly installed at the bottom of the U-shaped base 4, and two drive telescopic cylinders 38 are fixedly installed on the inner wall of the receiving groove 3. The telescopic ends of the drive telescopic cylinders 38 are fixedly connected to the U-shaped base 4.

[0044] Three low-voltage windings 12 are sleeved on the outer side of the lower yoke 15, and a high-voltage winding 11 is sleeved on the outer side of the low-voltage windings 12. Several detachable pads 14 are provided at the bottom of the upper clamp 7 and the top of the lower clamp 5. The top and bottom of the high-voltage windings 11 and the low-voltage windings 12 abut against the pads 14.

[0045] One of the upper clamps 7 has several high-voltage terminals 10 mounted on its top, and the high-voltage terminals 10 are connected to the high-voltage winding 11 via a high-voltage connecting rod 13.

[0046] The upper end of the fixed plate 28 is detachably provided with several fixed wedge blocks 34, and the end of the sliding plate 32 is detachably provided with a driven wedge block 33. The inclined end of the fixed wedge block 34 is slidably connected to the inclined end of the driven wedge block 33.

[0047] The upper interior and lower interior of the support plate 6 are respectively provided with an upper internal groove 29 and a lower internal groove 30. The upper internal groove 29 is provided with a lifting plate 23 that is vertically slidably connected to the support plate 6. Several connecting rods 25 are fixedly provided on the top of the lifting plate 23. The top of the connecting rods 25 extends upward to the outside and is fixedly connected to the lifting circular plate 26. The connecting rods 25 are slidably connected to the support plate 6.

[0048] The bottom of the upper built-in groove 29 is provided with a rotating shaft 22. The top of the rotating shaft 22 passes through the lifting plate 23 and is rotatably connected to the support plate 6. The outer wall of the rotating shaft 22 is provided with a lead screw section 24. The lifting plate 23 is threadedly connected to the lead screw section 24 on the rotating shaft 22.

[0049] An internal motor 21 is fixedly mounted on the top of the lower internal groove 30, and the bottom end of the rotating shaft 22 extends downward and is fixedly connected to the output shaft of the internal motor 21.

[0050] The top of the upper clamp 7 is fixed with several lifting rings 8.

[0051] The slot 35 has a trapezoidal cross-section, and the insert plate 31 is set accordingly.

[0052] The working principle of this device is as follows:

[0053] When the transformer is moved out, the box door 2 is opened, and the telescopic cylinder 38 is driven to slide the U-shaped base 4 outward, thereby moving the transformer to the outside of the transformer box 1. The casters 37 provide support for the U-shaped base 4 and facilitate the pushing out of the U-shaped base 4. This dry-type transformer adopts a movable installation design, which can be quickly moved to the outside of the box for maintenance without disconnecting from the transformer box 1, simplifying the transformer transfer process and improving the convenience of transformer maintenance.

[0054] When the U-shaped base 4 is located inside the transformer box 1, one end of the U-shaped base 4 abuts against the inner wall of the transformer box 1. When the box door 2 is closed, the box door 2 seals the opening end of the transformer box 1, and the box door 2 abuts against the other end of the U-shaped base 4. The opposite side wall of the U-shaped base 4 is slidably connected to the transformer box 1. Therefore, the inside of the transformer box 1 is a closed space, which can reduce the entry of dust. This transformer is not only easy to remove for maintenance, but also has an excellent sealing effect, which improves its practicality.

[0055] When disassembling and repairing the high-voltage winding 11 and the low-voltage winding 12, the high-voltage connecting rod 13 is first disassembled. Then, the built-in motor 21 drives the rotating shaft 22 to rotate, which in turn drives the lifting plate 23 to slide upward. Under the drive of the connecting rod 25, the lifting circular plate 26, the fixed cylinder 27, and the connecting cylinder 9 move upward, which in turn drives the upper yoke 16 to move upward and separate from the lower yoke 15. When the lifting circular plate 26 moves upward, the driven wedge block 33 drives the sliding plate 32 to slide inward, and the insert plate 31 disengages from the slot 35, thereby releasing the restriction on the connecting cylinder 9. At this time, the upper yoke 16 is lifted by the lifting ring 8 using equipment such as an overhead crane. Then, the high-voltage winding 11 and the low-voltage winding 12 are lifted out for repair in sequence. After the repair is completed, the high-voltage winding 11 and the low-voltage winding 12 are lifted into the lower yoke 15 in sequence. Then, the upper yoke 16 is lifted, so that the connecting cylinder 9 is sleeved on the outside of the fixed cylinder 27 and abuts against the lifting circular plate 26. The built-in motor 21 drives the lifting circular plate 26 to slide downward. As the yoke 16 moves downwards, the sliding plate 32 slides outwards. The insert plate 31 contacts the connecting cylinder 9 and adjusts the position of the upper yoke 16, preventing the bottom tip of the silicon steel sheet 19 in the upper yoke 16 from colliding with the silicon steel sheet 19 in the lower yoke 15 during insertion and causing damage. When the upper yoke 16 and lower yoke 15 are fully inserted, the insert plate 31 is inserted into the slot 35 and limits the upper yoke 16, preventing loosening at the connection between the upper yoke 16 and lower yoke 15. The upper yoke 16 and lower yoke 15 of the core are both integrated structures. When assembling the core, the upper yoke 16 can be quickly and accurately inserted into the lower yoke 15, and the upper yoke 16 is limited after insertion, which effectively prevents the connection between the upper yoke 16 and the lower yoke 15 from loosening during operation, thus improving the stability of the core structure. When disassembling the core, the upper yoke 16 and the lower yoke 15 can be quickly separated, which greatly simplifies the core disassembly process during the disassembly and repair of dry-type transformer windings and improves maintenance efficiency.

[0056] The pads 14 on the upper clamp 7 and the lower clamp 5 can better clamp and limit the high voltage winding 11 and the low voltage winding 12, and the pads 14 on the lower clamp 5 can facilitate the passing of the lifting rope through the high voltage winding 11 and the low voltage winding 12, thus improving the convenience of the lifting process.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A combined-connection type step-up substation transformer, characterized in that: The transformer includes a transformer box (1), with a door (2) hinged to the open end of the transformer box (1). A receiving groove (3) is provided through the bottom of the transformer box (1). A U-shaped base (4) is provided in the receiving groove (3) and is horizontally slidably connected to the transformer box (1). Two lower clamps (5) are detachably provided on the top of the U-shaped base (4). A lower yoke (15) is detachably connected between the two lower clamps (5). Two upper clamps (7) are provided above the U-shaped base (4). An upper yoke (16) is detachably connected between the two upper clamps (7). The upper yoke (16) is inserted into the lower yoke (15). Support plates (6) are fixed at the four corners of the top of the U-shaped base (4). A fixing plate is fixed on the top of the support plate (6). (28) The outer wall of the fixed plate (28) is fitted with a lifting circular plate (26) that is vertically slidably connected to it. The top of the lifting circular plate (26) is fixedly provided with a fixed cylinder (27). The outer wall of the fixed cylinder (27) is evenly distributed with several through-mounted grooves (36) along the circumference. The mounting groove (36) is provided with a sliding plate (32) that is horizontally slidably connected to the fixed cylinder (27). Several insert plates (31) are fixedly provided at the ends of the sliding plate (32). The two ends of the upper clamp (7) are respectively provided with a detachable connecting cylinder (9). The connecting cylinder (9) is fitted on the outside of the fixed cylinder (27) and abuts against the lifting circular plate (26). The inner wall of the connecting cylinder (9) is provided with several slots (35). The insert plates (31) are inserted into the slots (35). When the lifting disc (26) slides downward, the upper yoke (16) moves downward, and at the same time the sliding plate (32) slides outward. The insert plate (31) contacts the connecting cylinder (9) and adjusts the upper yoke (16). When the upper yoke (16) and the lower yoke (15) are inserted, the insert plate (31) is inserted into the slot (35) and limits the upper yoke (16) to prevent the connection between the upper yoke (16) and the lower yoke (15) from loosening.

2. The combined connection type step-up substation transformer according to claim 1, characterized in that: The upper yoke (16) and the lower yoke (15) are both composed of several silicon steel sheets (19). The silicon steel sheets (19) in the lower yoke (15) have a V-groove (20) on the top, and the bottom shape of the silicon steel sheets (19) in the upper yoke (16) is adapted to the V-groove (20).

3. A combined-connection step-up substation transformer according to claim 2, characterized in that: The upper clamp (7) and the lower clamp (5) are detachably connected to the silicon steel sheet (19) by fixing bolts (17), and the upper ends of several silicon steel sheets (19) in the lower yoke (15) are tightened and fixed by tightening bolts (18).

4. A combined-connection step-up substation transformer according to claim 1, characterized in that: The bottom of the U-shaped base (4) is fixedly provided with several casters (37), and the inner wall of the receiving groove (3) is fixedly provided with two drive telescopic cylinders (38). The telescopic end of the drive telescopic cylinder (38) is fixedly connected to the U-shaped base (4).

5. A combined-connection step-up substation transformer according to claim 1, characterized in that: The lower yoke (15) is fitted with three low-voltage windings (12) on the outside, and a high-voltage winding (11) is fitted on the outside of the low-voltage windings (12). The bottom of the upper clamp (7) and the top of the lower clamp (5) are provided with several detachable pads (14). The top and bottom of the high-voltage windings (11) and the low-voltage windings (12) abut against the pads (14).

6. A combined-connection step-up substation transformer according to claim 5, characterized in that: One of the upper clamps (7) is equipped with several high-voltage terminals (10) on its top. The high-voltage terminals (10) are connected to the high-voltage winding (11) through a high-voltage connecting rod (13). Several lifting rings (8) are fixedly provided on the top of the upper clamp (7).

7. A combined-connection step-up substation transformer according to claim 1, characterized in that: The upper end of the fixed plate (28) is detachably provided with a plurality of fixed wedge blocks (34), and the end of the sliding plate (32) is detachably provided with a driven wedge block (33). The inclined end of the fixed wedge block (34) is slidably connected to the inclined end of the driven wedge block (33).

8. A combined-connection step-up substation transformer according to claim 1, characterized in that: The upper interior and lower interior of the support plate (6) are respectively provided with an upper internal groove (29) and a lower internal groove (30). The upper internal groove (29) is provided with a lifting plate (23) that is vertically slidably connected to the support plate (6). Several connecting rods (25) are fixedly provided on the top of the lifting plate (23). The top of the connecting rods (25) extends upward to the outside and is fixedly connected to the lifting circular plate (26). The connecting rods (25) are slidably connected to the support plate (6).

9. A combined-connection step-up substation transformer according to claim 8, characterized in that: The bottom of the upper built-in groove (29) is provided with a rotating shaft (22). The top of the rotating shaft (22) passes through the lifting plate (23) and is rotatably connected to the support plate (6). The outer wall of the rotating shaft (22) is provided with a screw section (24). The lifting plate (23) is threadedly connected to the screw section (24) on the rotating shaft (22).

10. A combined-connection step-up substation transformer according to claim 9, characterized in that: The lower built-in groove (30) is fixedly provided with a built-in motor (21) at the top, and the bottom end of the rotating shaft (22) extends downward and is fixedly connected to the output shaft of the built-in motor (21).

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