A three-phase combined transformer

Abstract

The present application relates to transformer manufacturing technical field, specifically a kind of three-phase combined transformer, including A-phase transformer, B-phase transformer and C-phase transformer;The bottom of A-phase transformer, B-phase transformer and C-phase transformer is fixed with steel chassis;A-phase transformer and B-phase transformer are fixed with bellows, and lead wire is arranged in bellows, so that B-phase transformer and C-phase transformer are electrically connected;B-phase transformer and C-phase transformer are also fixed with bellows;The present application reasonably arranges three-phase integrated load tap changer, improves the arrangement mode of lead wire, reduces the workload of lead wire channel and field installation, ensures the internal insulation performance of transformer and field installation quality;Reasonably set up bellows and integral steel chassis, ensure the adjustment amount of field installation, avoid installation error;Transformer field occupies small area, and transportation quality is light.

Description

Technical Field

[0001] This invention relates to the field of transformer manufacturing technology, specifically a three-phase combined transformer. Background Technology

[0002] A three-phase transformer is a large power distribution device that uses the principle of electromagnetic induction to regulate the output voltage.

[0003] Existing three-phase transformers generally consist of a primary coil, a secondary coil, and an iron core, and are relatively large in size.

[0004] With the increasing demand for electricity in remote mountainous areas, the required capacity of power transformers is also increasing. Existing large-capacity integrated transformers are difficult to meet the harsh transportation conditions in remote mountainous areas. Therefore, a three-phase combined transformer is proposed to address the above problems. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies and solve the problem that existing large-capacity integrated transformers are difficult to meet the harsh transportation conditions in remote mountainous areas, this invention proposes a three-phase combined transformer.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A three-phase combined transformer, comprising an A-phase transformer, a B-phase transformer, and a C-phase transformer; a steel base frame is fixedly connected to the bottom of each of the A-phase, B-phase, and C-phase transformers; a corrugated pipe is fixedly connected between the A-phase and B-phase transformers, and leads are installed inside the corrugated pipe, making the B-phase and C-phase transformers electrically connected; a corrugated pipe is also fixedly connected between the B-phase and C-phase transformers, and leads are installed inside the corrugated pipe, making the B-phase and C-phase transformers electrically connected; a three-phase integrated on-load tap changer is installed on the B-phase transformer; an oil conservator is fixedly connected to the top of the B-phase transformer, and the oil conservator is connected to the interior of the A-phase, B-phase, and C-phase transformers through oil pipes; during operation, the A-phase, B-phase, and C-phase transformers are connected through internal leads, external pipelines, and an external steel base frame, connecting the A-phase... The transformer, B-phase transformer, and C-phase transformer are connected to form a combined transformer. The internal lead connection is achieved by strategically installing a three-phase integrated on-load tap changer on the B-phase transformer. Since the B-phase is located in the middle of the A, B, and C phases, this reduces the lead path and on-site installation workload, thus improving the lead layout. This ensures that on-site operations only require working on lower voltage levels such as the low-voltage and high-voltage taps, guaranteeing the transformer's internal insulation performance and the quality of on-site installation. The external connection is achieved by installing corrugated pipes between phases. These pipes serve two purposes: first, they provide a connection channel for the transformer's internal leads; second, they eliminate manufacturing and installation tolerances when connecting phases. A single steel base frame connects the bottom of the A, B, and C phase transformers. This frame ensures that the foundation surfaces of the combined three-phase transformers are on the same horizontal plane, eliminating subsequent installation tolerances.

[0007] Preferably, a transformer base is fixedly connected to the bottom of the steel base frame; two through slots are symmetrically opened at the bottom of the transformer base, and a groove is opened at the top of the through slots; a No. 1 plate is rotatably connected to the inner wall of the through slots via a rotating shaft; a caster wheel is fixedly connected to the bottom of the No. 1 plate; a positioning block is slidably connected in the groove; a No. 1 rod is fixedly connected to the top of the positioning block; the No. 1 rod passes through and is slidably connected to the top of the transformer base; a push plate is fixedly connected to the top of the No. 1 rod; a support block is fixedly connected to the bottom of the base; during operation, to facilitate the movement of the three-phase transformer... A jack can be used to support the bottom of the base and raise it a certain distance. Then, the casters can be rotated so that the wheels contact the ground. At this point, the push plate is pushed down, causing the push plate to move the first rod and the positioning block downwards. This allows the top of the first plate to contact the arc-shaped groove at the bottom of the positioning block, preventing the casters and the first plate from rotating and allowing the casters to roll smoothly on the ground. This solves the problem of the transformer body being difficult to move. At the same time, when installing the transformer body, there is no need to use a crane for hoisting, reducing installation steps and lowering installation costs.

[0008] The transformer base has a cavity on one side of the first rod. A second plate is slidably connected inside the cavity. The second rod is fixedly connected to the side of the second plate near the first rod. A limiting hole is formed on the side of the first rod near the cavity. The second rod and the limiting block are in clearance fit. A threaded rod is rotatably connected through the top of the cavity. A cam is sleeved and fixed to the outer wall of the threaded rod. During operation, when the top of the first plate contacts the arc-shaped groove at the bottom of the positioning block, the threaded rod is rotated, causing it to continuously enter the cavity. At the same time, the cam on the outer wall of the threaded rod will press the second plate, causing it to slide inside the cavity and insert the second rod into the limiting hole, thus limiting the position of the first rod and preventing it from retracting upwards.

[0009] Preferably, a first spring is fixed to the side of the second plate away from the cam, and the other end of the first spring is fixed to the inner wall of the cavity. During operation, by setting the first spring, when it is necessary to push the first rod upward, it is only necessary to rotate the threaded rod in the opposite direction so that the cam does not squeeze the second plate. With the elastic force of the first spring, the second plate will return to the initial position, and the second rod will leave the limiting hole.

[0010] Preferably, a first magnet is fixed to the inner wall of the through groove; a second magnet is fixed to the side wall of the universal wheel, and the longitudinal sections of the first magnet and the second magnet are in the shape of a right trapezoid. During operation, after the first rod and the positioning block are returned to their initial positions, the universal wheel can be rotated again to allow it to enter the through groove. At the same time, the first magnet and the second magnet attract each other, which can prevent the universal wheel from rotating.

[0011] Preferably, the top of the transformer base is provided with a rectangular groove; a support plate is slidably connected in the rectangular groove, and a steel base frame is fixed to the top of the support plate; a second spring is fixed between the bottom of the rectangular groove and the support plate; during operation, the transformer body will be vibrated during the movement of the transformer base, and with the use of the support plate and the second spring, the second spring will be compressed and deformed, which has a good shock absorption effect and helps to protect the transformer body.

[0012] Preferably, a No. 3 plate is fixedly connected to the inner wall of the rectangular groove; a No. 3 rod is fixedly connected to the bottom of the support plate; the No. 3 rod passes through and is slidably connected to the No. 3 plate; a No. 3 spring is fixedly connected between the No. 3 plate and the support plate; during operation, when the support plate slides downward along the rectangular groove, the No. 3 rod will slide along the hole on the No. 3 plate, and at the same time the No. 3 spring will be compressed, which has a good shock absorption effect and is beneficial to protecting the transformer body.

[0013] Preferably, the bottom end of the third rod is hinged to the fourth rod, and the other end of the fourth rod is hinged to the L-shaped plate; the L-shaped plate is slidably connected to the bottom of the rectangular groove; a baffle is fixedly connected to the bottom of the rectangular groove; a fourth spring is fixedly connected between the L-shaped plate and the baffle; during operation, when the third rod moves downward, it will squeeze the fourth rod, causing the fourth rod to push the L-shaped plate to slide at the bottom of the rectangular groove, while the fourth spring is compressed, which also has a shock absorption effect. By setting multiple shock absorptions, it is beneficial to protect the transformer body.

[0014] The advantages of this invention are:

[0015] 1. This invention rationally arranges the three-phase integrated on-load tap changer, improves the lead wire arrangement, reduces lead wire channels and on-site installation workload, and ensures the internal insulation performance of the transformer and the quality of on-site installation; the reasonable setting of corrugated pipe and integral steel base frame ensures the adjustment range during on-site installation and avoids installation errors; the transformer occupies a small area on-site and is lightweight during transportation.

[0016] 2. This invention features a transformer base. By rotating the casters, the wheels of the casters contact the ground. At this point, pushing the push plate downwards causes the top of the first plate to contact the arc-shaped groove at the bottom of the positioning block. This prevents the casters and the first plate from rotating, allowing the casters to roll smoothly on the ground. This solves the problem of the transformer body being difficult to move. Furthermore, it eliminates the need for a crane when installing the transformer body, reducing installation steps and costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a partial cross-sectional structural diagram of Example 1;

[0019] Figure 2 This is a schematic diagram of the cam structure in Example 1;

[0020] Figure 3 for Figure 1 Enlarged view of a portion of region D;

[0021] Figure 4 for Figure 3 Enlarged view of a portion of region E in the middle;

[0022] Figure 5 This is a schematic diagram of the high-voltage tap connection on the high-voltage lead side;

[0023] Figure 6 This diagram illustrates the low-voltage connection on the low-voltage lead side and the connection of the medium-voltage neutral point.

[0024] Figure 7 The attached figure is for Embodiment 2.

[0025] In the diagram: 1. Phase A transformer; 2. Phase B transformer; 3. Phase C transformer; 4. Steel base frame; 5. Corrugated pipe; 6. Three-phase integrated on-load tap changer; 7. Oil conservator; 8. Transformer base; 9. Plate No. 1; 10. Caster wheel; 11. Positioning block; 12. Rod No. 1; 13. Push plate; 14. Support block; 15. Plate No. 2; 16. Rod No. 2; 17. Threaded rod; 18. Cam; 19. Spring No. 1; 20. Magnet plate 1; 21. Magnet plate 2; 22. Support plate; 23. Spring No. 2; 24. Plate No. 3; 25. Rod No. 3; 26. Spring No. 3; 27. Rod No. 4; 28. L-shaped plate; 29. ​​Baffle; 30. Spring No. 4; 31. Handle. 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] Example 1

[0028] Please see Figure 1-6 As shown, a three-phase combined transformer includes an A-phase transformer 1, a B-phase transformer 2, and a C-phase transformer 3. A steel base frame 4 is fixedly connected to the bottom of each of the A-phase transformer 1, B-phase transformer 2, and C-phase transformer 3. A corrugated pipe 5 is fixedly connected between the A-phase transformer 1 and the B-phase transformer 2, and leads are installed inside the corrugated pipe 5, electrically connecting the B-phase transformer 2 and the C-phase transformer 3. A corrugated pipe 5 is also fixedly connected between the B-phase transformer 2 and the C-phase transformer 3, and leads are installed inside the corrugated pipe 5, electrically connecting the B-phase transformer 2 and the C-phase transformer 3. A three-phase integrated on-load tap changer 6 is installed on phase B transformer 2; an oil conservator 7 is fixedly connected to the top of phase B transformer 2, and the oil conservator 7 is internally connected to phase A transformer 1, phase B transformer 2, and phase C transformer 3 through oil pipes; during operation, phase A transformer 1, phase B transformer 2, and phase C transformer 3 are connected into a combined transformer through internal lead wire connections, external pipeline connections, and an external steel base frame 4; the internal lead wire connection is achieved by reasonably installing a three-phase integrated on-load tap changer 6 on phase B transformer 2. Connecting switch 6, since phase B is located in the middle of phases A, B, and C, reduces the amount of lead-in wiring and on-site installation work, thus improving the lead-in wiring arrangement. This ensures that on-site operations only need to be performed on lower voltage levels such as the low-voltage and high-voltage taps, guaranteeing the transformer's internal insulation performance and the quality of on-site installation. The external connection is achieved by installing corrugated pipes 5 between phases. Their functions are twofold: first, corrugated pipes 5 provide a connection channel for the transformer's internal leads; second, corrugated pipes 5 eliminate manufacturing and installation tolerances when connecting phases. A, B The bottom of the C-phase three-phase transformer is connected by an integral steel base frame 4. The function of the integral steel base frame 4 is to ensure that the foundation surfaces of the assembled three-phase three-phase transformers are on the same horizontal plane, which can eliminate the installation tolerance in the later stage. The invention has a reasonable arrangement of the three-phase integrated on-load tap changer 6 and an improved lead wire arrangement method, which reduces the lead wire channel and the amount of on-site installation work, and ensures the internal insulation performance of the transformer and the quality of on-site installation. The corrugated pipe 5 is reasonably set with the integral steel base frame 4 to ensure the adjustment range during on-site installation and avoid installation errors. The transformer occupies a small area on site and is lightweight for transportation.

[0029] A transformer base 8 is fixedly connected to the bottom of the steel base frame 4; two through slots are symmetrically opened at the bottom of the transformer base 8, and a groove is opened at the top of the through slots; a No. 1 plate 9 is rotatably connected to the inner wall of the through slots via a rotating shaft; a caster wheel 10 is fixedly connected to the bottom of the No. 1 plate 9; a positioning block 11 is slidably connected in the groove; a No. 1 rod 12 is fixedly connected to the top of the positioning block 11; the No. 1 rod 12 passes through and is slidably connected to the top of the transformer base 8; a push plate 13 is fixedly connected to the top of the No. 1 rod 12; a support block 14 is fixedly connected to the bottom of the base; during operation, in order to facilitate the movement of the three-phase transformer, A jack can be used to support the bottom of the base and raise it a certain distance. Then, the caster wheel 10 can be rotated so that the wheels of the caster wheel 10 contact the ground. At this time, the push plate 13 is pushed down, causing the push plate 13 to drive the first rod 12 and the positioning block 11 to move downwards. This allows the top of the first plate 9 to contact the arc-shaped groove at the bottom of the positioning block 11, preventing the caster wheel 10 and the first plate 9 from rotating and allowing the caster wheel 10 to roll smoothly on the ground. This solves the problem of the transformer body being difficult to move. At the same time, when installing the transformer body, there is no need to use a crane for hoisting, reducing installation steps and lowering installation costs.

[0030] The transformer base 8 has a cavity on one side of the first rod 12. A second plate 15 is slidably connected inside the cavity. A second rod 16 is fixedly connected to the side of the second plate 15 near the first rod 12. A limiting hole is opened on the side of the first rod 12 near the cavity. The second rod 16 and the limiting hole are in clearance fit. A threaded rod 17 is rotatably connected through the top of the cavity. A cam 18 is sleeved and fixedly connected to the outer wall of the threaded rod 17. During operation, when the top of the first plate 9 contacts the arc groove at the bottom of the positioning block 11, the threaded rod 17 is rotated, causing it to continuously enter the cavity. At the same time, the cam 18 on the outer wall of the threaded rod 17 will press the second plate 15, causing it to slide inside the cavity and allowing the second rod 16 to insert into the limiting hole, thus limiting the position of the first rod 12 and preventing the first rod 12 from retracting upwards.

[0031] A first spring 19 is fixed to the side of the second plate 15 away from the cam 18, and the other end of the first spring 19 is fixed to the inner wall of the cavity. During operation, by setting the first spring 19, when it is necessary to push the first rod 12 upward, it is only necessary to rotate the threaded rod 17 in the opposite direction so that the cam 18 does not squeeze the second plate 15. With the elastic force of the first spring 19, the second plate 15 will be pushed back to the initial position, and the second rod 16 will leave the limiting hole.

[0032] A magnet 20 is fixed to the inner wall of the through groove; a magnet 21 is fixed to the side wall of the caster wheel 10, and the longitudinal sections of magnet 20 and magnet 21 are in the shape of a right trapezoid. During operation, after the first rod 12 and the positioning block 11 are returned to their initial positions, the caster wheel 10 can be rotated again to allow the caster wheel 10 to enter the through groove. At the same time, magnet 20 and magnet 21 are attracted together, which can prevent the caster wheel 10 from rotating.

[0033] The top of the transformer base 8 is provided with a rectangular groove; a support plate 22 is slidably connected in the rectangular groove, and a steel base frame 4 is fixed to the top of the support plate 22; a second spring 23 is fixed between the bottom of the rectangular groove and the support plate 22; during operation, the transformer body will be vibrated when the transformer base 8 is moved. With the use of the support plate 22 and the second spring 23, the second spring 23 will be compressed and deformed, which has a good shock absorption effect and helps to protect the transformer body.

[0034] The inner wall of the rectangular groove is fixedly connected to a No. 3 plate 24; the bottom of the support plate 22 is fixedly connected to a No. 3 rod 25; the No. 3 rod 25 passes through and is slidably connected to the No. 3 plate 24; a No. 3 spring 26 is fixedly connected between the No. 3 plate 24 and the support plate 22; during operation, when the support plate 22 slides downward along the rectangular groove, the No. 3 rod 25 will slide along the hole on the No. 3 plate 24, and at the same time the No. 3 spring 26 will be compressed, which has a good shock absorption effect and is beneficial to protecting the transformer body.

[0035] The bottom end of the third rod 25 is hinged to the fourth rod 27, and the other end of the fourth rod 27 is hinged to the L-shaped plate 28; the L-shaped plate 28 is slidably connected to the bottom of the rectangular groove; the bottom of the rectangular groove is fixedly connected to the baffle 29; the fourth spring 30 is fixedly connected between the L-shaped plate 28 and the baffle 29; during operation, when the third rod 25 moves downward, it will squeeze the fourth rod 27, causing the fourth rod 27 to push the L-shaped plate 28 to slide at the bottom of the rectangular groove, while the fourth spring 30 is compressed, which also has a shock absorption effect. By setting multiple shock absorptions, it is beneficial to protect the transformer body.

[0036] Example 2

[0037] Please see Figure 7 As shown in the first embodiment, as another implementation of the present invention, the top end of the threaded rod 17 is fixedly connected to a handle 31. During operation, by setting the handle 31, it is easy to rotate the threaded rod 17. When the threaded rod 17 rotates downward, the cam 18 will press against the second plate 15 to fix the first rod 12. When the threaded rod 17 rotates upward, the cam 18 will leave the second plate 15, thereby resetting the second rod 16.

[0038] Working Principle: To facilitate the movement of the three-phase transformer, a jack can be used to support the bottom of the base and raise it a certain distance. Then, the caster wheel 10 is rotated so that its wheels contact the ground. At this point, the push plate 13 is pushed downwards, causing the push plate 13 to move the first rod 12 and the positioning block 11 downwards. This causes the top of the first plate 9 to contact the arc-shaped groove at the bottom of the positioning block 11, preventing the caster wheel 10 and the first plate 9 from rotating and allowing the caster wheel 10 to roll smoothly on the ground. Simultaneously, after the top of the first plate 9 contacts the arc-shaped groove at the bottom of the positioning block 11, the threaded rod 17 is rotated to prevent it from... The first rod 12 is inserted into the cavity, and the cam 18 on the outer wall of the threaded rod 17 presses the second plate 15, causing the second plate 15 to slide in the cavity and the second rod 16 to insert into the limiting hole, thus limiting the position of the first rod 12. This solves the problem of the transformer body being difficult to move, and also eliminates the need for a crane to lift the transformer body during installation, reducing installation steps and costs. After the first rod 12 and the positioning block 11 are returned to their initial positions, the universal wheel 10 can be rotated again, allowing it to enter the through slot. At the same time, the first magnet 20 and the second magnet 21 are attracted together, preventing the universal wheel 10 from rotating.

[0039] During the movement of the transformer base 8, the transformer body will be vibrated. With the use of the support plate 22 and the second spring 23, the second spring 23 will be compressed and deformed, which has a good shock absorption effect. When the support plate 22 slides down along the rectangular groove, the third rod 25 will slide along the hole on the third plate 24, and the third spring 26 will be compressed, which has a good shock absorption effect. When the third rod 25 moves down, it will squeeze the fourth rod 27, which will push the L-shaped plate 28 to slide at the bottom of the rectangular groove, and the fourth spring 30 will be compressed, which has another shock absorption effect. By setting multiple shock absorptions, it is beneficial to protect the transformer body.

[0040] Figure 6 This diagram shows the high-voltage tap connection on the high-voltage lead side. Markings 32, 33, and 34 represent the high-voltage taps A, B, and C, respectively. Marking 4 is the three-phase integrated on-load tap changer. Marking 36 is the high-voltage outgoing line, and marking 37 is the high-voltage neutral point outgoing line. Figure 7 This diagram illustrates the low-voltage connection on the low-voltage lead side and the medium-voltage neutral point connection. Identifier 38 indicates the low-voltage connection, Identifier 39 indicates the medium-voltage neutral point connection, and Identifier 40 indicates the medium-voltage outgoing line.

[0041] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A three-phase combined transformer, characterized in that: The system includes an A-phase transformer (1), a B-phase transformer (2), and a C-phase transformer (3); a steel base frame (4) is fixedly connected to the bottom of each of the A-phase transformer (1), B-phase transformer (2), and C-phase transformer (3); a corrugated pipe (5) is fixedly connected between the A-phase transformer (1) and the B-phase transformer (2), and a lead wire is installed inside the corrugated pipe (5) so that the B-phase transformer (2) and the C-phase transformer (3) are electrically connected; a corrugated pipe (5) is also fixedly connected between the B-phase transformer (2) and the C-phase transformer (3), and a lead wire is installed inside the corrugated pipe (5) so that the B-phase transformer (2) and the C-phase transformer (3) are electrically connected; a three-phase integrated on-load tap changer (6) is installed on the B-phase transformer (2); an oil conservator (7) is fixedly connected to the top of the B-phase transformer (2), and the oil conservator (7) is connected to the interior of the A-phase transformer (1), the B-phase transformer (2), and the C-phase transformer (3) through an oil pipe; A transformer base (8) is fixedly connected to the bottom of the steel base frame (4); two through slots are symmetrically opened at the bottom of the transformer base (8), and a groove is opened at the top of the through slots; a No. 1 plate (9) is rotatably connected to the inner wall of the through slots via a rotating shaft; a universal wheel (10) is fixedly connected to the bottom of the No. 1 plate (9); a positioning block (11) is slidably connected in the groove; a No. 1 rod (12) is fixedly connected to the top of the positioning block (11); the No. 1 rod (12) passes through and is slidably connected to the top of the transformer base (8); a push plate (13) is fixedly connected to the top of the No. 1 rod (12); a support block (14) is fixedly connected to the bottom of the base. The transformer base (8) has a cavity on one side of the first rod (12); a second plate (15) is slidably connected inside the cavity; a second rod (16) is fixedly connected to the side of the second plate (15) near the first rod (12); a limit hole is opened on the side of the first rod (12) near the cavity; the second rod (16) and the limit hole are in clearance fit; a threaded rod (17) is rotatably connected through the top of the cavity; a cam (18) is sleeved and fixedly connected to the outer wall of the threaded rod (17); A first spring (19) is fixed to the side of the second plate (15) away from the cam (18), and the other end of the first spring (19) is fixed to the inner wall of the cavity. During operation, a jack is installed at the bottom of the transformer base (8). The jack is used to raise the distance between the transformer base (8) and the ground. When the wheel of the universal wheel (10) contacts the ground, the positioning block (11) in the groove slides down to the arc groove at the bottom of the positioning block (11) and contacts the top of the first plate (9).

2. A three-phase combined transformer according to claim 1, characterized in that: A magnet plate 1 (20) is fixed to the inner wall of the through groove; a magnet plate 2 (21) is fixed to the side wall of the universal wheel (10), and the longitudinal sections of the magnet plate 1 (20) and the magnet plate 2 (21) are in the shape of a right trapezoid.

3. A three-phase combined transformer according to claim 2, characterized in that: The top of the transformer base (8) is provided with a rectangular groove; a support plate (22) is slidably connected in the rectangular groove, and a steel base frame (4) is fixed to the top of the support plate (22); a second spring (23) is fixed between the bottom of the rectangular groove and the support plate (22).

4. A three-phase combined transformer according to claim 3, characterized in that: The inner wall of the rectangular groove is fixedly connected to a No. 3 plate (24); the bottom of the support plate (22) is fixedly connected to a No. 3 rod (25); the No. 3 rod (25) passes through and is slidably connected to the No. 3 plate (24); a No. 3 spring (26) is fixedly connected between the No. 3 plate (24) and the support plate (22).

5. A three-phase combined transformer according to claim 4, characterized in that: The bottom end of the third rod (25) is hinged to the fourth rod (27), and the other end of the fourth rod (27) is hinged to the L-shaped plate (28); the L-shaped plate (28) is slidably connected to the bottom of the rectangular groove; the bottom of the rectangular groove is fixedly connected to the baffle (29); and the fourth spring (30) is fixedly connected between the L-shaped plate (28) and the baffle (29).

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