Protective transformer

Abstract

The invention relates to the technical field of transformers, and discloses a protective transformer which comprises a dry-type transformer body, three high-voltage windings are arranged in the dry-type transformer body, and three low-voltage windings are arranged in the dry-type transformer body. And the three low-voltage winding groups are respectively arranged in the three high-voltage winding groups. The temperature of the high-voltage winding and the temperature of the low-voltage winding are detected through the same temperature monitoring probe, when the temperature of the high-voltage winding is larger than or equal to that of the low-voltage winding, the temperature monitoring probe can detect the temperature of the high-voltage winding, and the situation that the two temperature monitoring probes are damaged due to aging is avoided; and the temperature of the high-voltage coil is far higher than that of the low-voltage coil and is not monitored, so that the working safety of the dry-type transformer body is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a protective transformer. Background Art

[0002] Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, CNC machinery and equipment and other places. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. The cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). When the transformer is cooled by natural air, it can operate continuously for a long time at the rated capacity. When the transformer is cooled by forced air, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation or emergency overload operation.

[0003] When the dry-type transformer is in use, the high-voltage coil is subjected to a higher voltage, but a smaller current. Since the current is smaller, the resistance loss is lower, so it usually generates less heat. The low-voltage coil is subjected to a lower voltage, but a larger current. According to Joule's law, heat is generated when current passes through a resistor. The low-voltage coil usually generates more heat due to the larger current. Under normal operation, the working temperature of the low-voltage winding is: 90℃-105℃, and the working temperature of the high-voltage winding is: 80℃-95℃. The temperature of the high-voltage coil of the dry-type transformer is 5℃-10℃ lower than that of the low-voltage coil.

[0004] Most of the existing dry-type transformers have a temperature monitoring probe inserted on the high-voltage coil and the low-voltage coil. During long-term operation, the temperature monitoring probe will age, resulting in inaccurate changes in the temperature difference between the high-voltage coil and the low-voltage coil. The high-voltage coil temperature may be much higher than the low-voltage coil temperature without being monitored, causing damage to the dry-type transformer and posing a safety hazard to users. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a protective transformer.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A protective transformer comprises a dry-type transformer body, wherein three high-voltage winding groups are arranged inside the dry-type transformer body, and three low-voltage winding groups are arranged inside the dry-type transformer body, wherein the three low-voltage winding groups are arranged inside the three high-voltage winding groups respectively, and a gap is arranged between the low-voltage winding groups and the high-voltage winding groups, and a plurality of insulators are arranged on the tops of the three high-voltage winding groups, and a mounting frame is fixedly installed on the outer surface of the insulator, and a box body is fixedly installed on the lower surface of the other end of the mounting frame, and two partitions are symmetrically fixedly installed on the inner wall of the box body, and the box body is divided by the two partitions. The box body is divided into a first cavity, a hollow cavity and a second cavity, the hollow cavity is arranged between the first cavity and the second cavity, the first cavity is arranged on the side of the box body close to the high-voltage winding group, the second cavity is arranged on the side of the box body close to the low-voltage winding group, a piston plate is slidably installed between the inner walls of the first cavity, the same piston plate is slidably installed between the inner walls of the second cavity, a sliding column is fixedly installed between the outer surfaces of the adjacent sides of the piston plates, the sliding column passes through the outer surfaces of the two partitions and is slidably installed therewith, and the outer surfaces on the opposite sides of the box body are respectively flush with the outer surfaces of the high-voltage winding group and the low-voltage winding group.

[0008] As a further solution of the present invention, an opening is provided on the upper surface of the box body, and the opening is communicated with the cavity. The upper surface of the mounting frame is provided with a same opening, and two supporting blocks are symmetrically fixedly installed on the upper surface of the mounting frame. A rotating shaft is rotatably installed between the two supporting blocks, and a rotating plate is fixedly installed on the outer surface of the rotating shaft. The rotating plate is arranged inside the cavity, and a guide groove is provided on the bottom end of the rotating plate. A guide column is fixedly installed on the outer surface of the sliding column, and the guide column is slidably installed with the inner wall of the guide groove.

[0009] As a further solution of the present invention, one end of the rotating shaft passes through the outer surface of one of the supporting blocks and is fixedly installed with a first gear, the supporting block is rotatably installed with a second gear on the outer surface close to the first gear, the second gear is meshed with the first gear, a transmission shaft is fixedly installed on the outer surface of the rotation center of the second gear, a driving disk is fixedly installed on the other end of the transmission shaft, a driving column is fixedly installed on the outer surface of the driving disk away from the second gear, and the driving column is arranged at an eccentric position of the driving disk.

[0010] As a further solution of the present invention, a connecting rod is rotatably installed on the end surface of the mounting frame close to the driving disk, a driving groove is provided on the outer surface of the connecting rod close to the top end, the driving column is slidably installed on the inner wall of the driving groove, a second spring is fixedly installed on the bottom end of the connecting rod, and a temperature monitoring probe is fixedly installed on the bottom end of the second spring.

[0011] As a further solution of the present invention, a bracket is fixedly installed on the lower surface of the mounting frame, a rotating rod is rotatably installed on the upper surface of the bracket, the bottom end of the rotating rod passes through the lower surface of the bracket and is fixedly installed with a driving fan, the top end of the rotating rod passes through the upper surface of the mounting frame and is fixedly installed with a rotating wheel, a plurality of slots are evenly arranged on the circumferential outer surface of the rotating wheel, an elastic paddle is fixedly installed on the upper surface of the mounting frame, one end of the elastic paddle is abutted against the slot on the outer surface of the rotating wheel, and a blast heat sink is arranged at the bottom of the dry-type transformer body.

[0012] As a further solution of the present invention, the mounting frame is fixedly installed with a fixing block near the upper surface of the bracket, the outer surface of the fixing block is provided with a square hole, and the inner wall of the square hole is slidably installed with a square sliding rod, and the outer surface of the square sliding rod near one end of the bracket is fixedly installed with a blocking piece, and the outer surface of the square sliding rod is sleeved with a first spring, the first spring is arranged between the blocking piece and the fixing block, the other end of the rotating shaft passes through the outer surface of the other supporting block and a turntable is fixedly installed, and the outer surface of one side of the turntable is fixedly installed with an arc convex strip, the arc convex strip and the turntable are arranged at the same center of the circle, one end of the arc convex strip is higher than the other end, one end of the square sliding rod is against the outer surface of the arc convex strip, and the other end of the square sliding rod is against the slot on the outer surface of the rotating wheel.

[0013] As a further solution of the present invention, gas inlet and outlet valves are fixedly installed on the upper surfaces of the box body located in the first cavity and the second cavity, and the two gas inlet and outlet valves are respectively connected to the interior of the first cavity and the second cavity.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. When the dry-type transformer body is working normally, the working temperature of the low-voltage winding group will be higher than that of the high-voltage winding group. The connecting rod drives the temperature monitoring probe to contact the outer surface of the low-voltage winding group through the second spring to monitor the temperature of the low-voltage winding group. When the working temperature of the high-voltage winding group suddenly rises, the temperature of the high-voltage winding group is greater than or equal to that of the low-voltage winding group, and the sliding column will move in the opposite direction. At this time, the temperature monitoring probe is driven by the connecting rod to contact the outer surface of the high-voltage winding group. The device uses the same temperature monitoring probe to detect the temperature of the high-voltage winding group and the low-voltage winding group. When the temperature of the high-voltage winding group is greater than or equal to that of the low-voltage winding group, the temperature monitoring probe will detect the temperature of the high-voltage winding group, avoiding the situation where the high-voltage coil temperature is much higher than the low-voltage coil temperature and is not monitored due to aging of the two temperature monitoring probes, thereby ensuring the working safety of the dry-type transformer body.

[0016] 2. When the temperature of the high-voltage winding group is greater than or equal to that of the low-voltage winding group, the wind blown out by the blast radiator drives the driving fan to rotate, and the driving fan drives the rotating wheel to rotate through the rotating rod, and the rotating wheel moves the elastic paddle through the card slot on the surface. At this time, the elastic paddle makes a sound. Through this device, a sound can be made when the temperature monitoring probe is rotated to one side of the high-voltage winding group, and the user is reminded by the sound that the working temperature of the dry-type transformer body is abnormal, so that the user can repair it in time. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 This is a front structural schematic diagram of a protective transformer proposed by the present invention;

[0019] Figure 3 A schematic diagram of a mounting frame for a protective transformer proposed by the present invention;

[0020] Figure 4 A schematic diagram of a box body of a protective transformer proposed by the present invention;

[0021] Figure 5 A schematic diagram of the internal structure of a protective transformer box body proposed by the present invention;

[0022] Figure 6 A schematic cross-sectional view of a box body of a protective transformer proposed by the present invention;

[0023] Figure 7 A schematic diagram of a sliding column of a protective transformer proposed by the present invention;

[0024] Figure 8 for Figure 4 A partial enlarged schematic diagram in the middle.

[0025] In the figure: 1. dry-type transformer body; 2. blast radiator; 3. high-voltage winding group; 4. low-voltage winding group; 5. mounting frame; 6. box body; 7. bracket; 8. driving fan; 9. rotating wheel; 10. elastic paddle; 11. turntable; 12. arc convex strip; 13. fixing block; 14. square slide bar; 15. baffle; 16. first spring; 17. support block; 18. rotating plate; 19. first gear; 20. second gear; 21. driving disk; 22. connecting rod; 23. second spring; 24. temperature monitoring probe; 25. driving groove; 26. driving column; 27. partition; 28. piston plate; 29. ​​sliding column; 30. guide column; 31. guide groove. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Reference Figure 1-Figure 8A protective transformer comprises a dry-type transformer body 1, wherein three high-voltage winding groups 3 are arranged inside the dry-type transformer body 1, and three low-voltage winding groups 4 are arranged inside the dry-type transformer body 1, respectively. A gap is arranged between the low-voltage winding group 4 and the high-voltage winding group 3, and a plurality of insulators are arranged on the top of each of the three high-voltage winding groups 3. A mounting frame 5 is fixedly mounted on the outer surface of the insulator, and a box body 6 is fixedly mounted on the lower surface of the other end of the mounting frame 5. Two partitions 27 are symmetrically fixedly mounted on the inner wall of the box body 6, and the box body 6 is divided into a first cavity, an empty cavity, and a hollow cavity by the two partitions 27. The first cavity and the second cavity are provided, the cavity is arranged between the first cavity and the second cavity, the first cavity is arranged on the side of the box body 6 close to the high-voltage winding group 3, the second cavity is arranged on the side of the box body 6 close to the low-voltage winding group 4, a piston plate 28 is slidably installed between the inner walls of the first cavity, the same piston plate 28 is slidably installed between the inner walls of the second cavity, a sliding column 29 is fixedly installed between the outer surfaces of the adjacent sides of the two piston plates 28, the sliding column 29 penetrates the outer surfaces of the two partitions 27 and is slidably installed therewith, the outer surfaces of the opposite sides of the box body 6 are respectively flush with the outer surfaces of the high-voltage winding group 3 and the low-voltage winding group 4, and an opening is opened on the upper surface of the box body 6. The opening is connected to the cavity, the upper surface of the mounting frame 5 is penetrated with the same opening, the upper surface of the mounting frame 5 is symmetrically fixedly installed with two support blocks 17, a rotating shaft is rotatably installed between the two support blocks 17, a rotating plate 18 is fixedly installed on the outer surface of the rotating shaft, the rotating plate 18 is arranged inside the cavity, a guide groove 31 is penetrated through the bottom end of the rotating plate 18, a guide column 30 is fixedly installed on the outer surface of the sliding column 29, and the guide column 30 is slidably installed with the inner wall of the guide groove 31, one end of the rotating shaft penetrates the outer surface of one of the support blocks 17 to be fixedly installed with a first gear 19, and the outer surface of the support block 17 close to the first gear 19 is rotatably installed with a second gear 20, and the second The gear 20 is meshed with the first gear 19, and a transmission shaft is fixedly installed on the outer surface of the rotation center of the second gear 20, and a driving disk 21 is fixedly installed on the other end of the transmission shaft. A driving column 26 is fixedly installed on the outer surface of the driving disk 21 away from the second gear 20, and the driving column 26 is arranged at an eccentric position of the driving disk 21. A connecting rod 22 is rotatably installed on the end surface of the mounting frame 5 close to the driving disk 21. A driving groove 25 is provided on the outer surface of the connecting rod 22 close to the top, and the driving column 26 is slidably installed on the inner wall of the driving groove 25. A second spring 23 is fixedly installed on the bottom end of the connecting rod 22, and a temperature monitoring probe 24 is fixedly installed on the bottom end of the second spring 23.

[0030] When the temperature of the high-voltage winding group 3 is greater than or equal to the low-voltage winding group 4, the sliding column 29 will move in the opposite direction. At this time, the temperature monitoring probe 24 is driven by the connecting rod 22 to be flush with the outer surface of the high-voltage winding group 3. When the temperature monitoring probe 24 is in the switching position, it will record the temperature of the low-voltage winding group 4. When it rotates to the position of the high-voltage winding group 3, it detects the temperature of the high-voltage winding group 3 and compares it with the temperature of the low-voltage winding group 4. The temperature monitoring probe 24 and the temperature controller compare the data of the two to determine whether the high-voltage winding group 3 and the low-voltage winding group 4 are within the normal temperature range. The device uses the same temperature monitoring probe 24 to detect the temperature of the high-voltage winding group 3 and the low-voltage winding group 4. When the temperature of the high-voltage winding group 3 is greater than or equal to the low-voltage winding group 4, the temperature monitoring probe 24 will detect the temperature of the high-voltage winding group 3, avoiding the situation where the high-voltage coil temperature is much higher than the low-voltage coil temperature and is not monitored due to aging damage of the two temperature monitoring probes 24, thereby ensuring the working safety of the dry-type transformer body 1.

[0031] In this embodiment, a bracket 7 is fixedly installed on the lower surface of the mounting frame 5, a rotating rod is rotatably installed on the upper surface of the bracket 7, the bottom end of the rotating rod passes through the lower surface of the bracket 7 and is fixedly installed with a driving fan 8, the top end of the rotating rod passes through the upper surface of the mounting frame 5 and is fixedly installed with a rotating wheel 9, a plurality of slots are evenly arranged on the circumferential outer surface of the rotating wheel 9, an elastic paddle 10 is fixedly installed on the upper surface of the mounting frame 5, one end of the elastic paddle 10 is against the slot on the outer surface of the rotating wheel 9, a blast radiator 2 is arranged at the bottom of the dry-type transformer body 1, a fixing block 13 is fixedly installed on the upper surface of the mounting frame 5 close to the bracket 7, a square hole is opened on the outer surface of the fixing block 13, and a square hole is formed on the outer surface of the fixing block 13. A square slide bar 14 is slidably installed on the inner wall, and a baffle 15 is fixedly installed on the outer surface of the square slide bar 14 near one end of the bracket 7. A first spring 16 is sleeved on the outer surface of the square slide bar 14, and the first spring 16 is arranged between the baffle 15 and the fixed block 13. The other end of the rotating shaft passes through the outer surface of another supporting block 17 and a turntable 11 is fixedly installed. An arc convex strip 12 is fixedly installed on the outer surface of one side of the turntable 11. The arc convex strip 12 and the turntable 11 are located at the same center of the circle, and one end of the arc convex strip 12 is higher than the other end. One end of the square slide bar 14 is against the outer surface of the arc convex strip 12, and the other end of the square slide bar 14 is against the groove on the outer surface of the rotating wheel 9.

[0032] When the temperature of the high-voltage winding group 3 is greater than or equal to that of the low-voltage winding group 4, the sliding column 29 drives the rotating plate 18 to rotate in the opposite direction, and the rotating plate 18 drives the rotating disk 11 to rotate through the rotating shaft, and the rotating disk 11 drives the arc convex strip 12 to rotate relative to the square sliding rod 14. At this time, the end of the square sliding rod 14 moves to the bottom end of the arc convex strip 12, and the other end of the square sliding rod 14 leaves the card slot of the rotating wheel 9 through the first spring 16, and the rotating wheel 9 is released from the limit. When the dry-type transformer body 1 is working, the heat is dissipated through the blast radiator 2, and the blast radiator 2 blows The outgoing wind will flow in the gap between the high-voltage winding group 3 and the low-voltage winding group 4, because the rotating wheel 9 is released from the limit. At this time, the wind blown out by the blast radiator 2 drives the driving fan 8 to rotate, and the driving fan 8 drives the rotating wheel 9 to rotate through the rotating rod. The rotating wheel 9 moves the elastic paddle 10 through the card slot on the surface. At this time, the elastic paddle 10 makes a sound. Through this device, a sound can be made when the temperature monitoring probe 24 is rotated to the side of the high-voltage winding group 3. The sound reminds the user that the working temperature of the dry-type transformer body 1 is abnormal, which is convenient for the user to repair in time.

[0033] In this embodiment, gas inlet and outlet valves are fixedly installed on the upper surfaces of the box body 6 located in the first cavity and the second cavity, and the two gas inlet and outlet valves are respectively connected to the inside of the first cavity and the second cavity.

[0034] Before use, the operator injects helium of the same pressure into the first cavity and the second cavity through the gas inlet and outlet valves, and then installs the box body 6 into the gap between the high-voltage winding group 3 and the low-voltage winding group 4 through the mounting frame 5, so that the box body 6 is flush with the outer surfaces of the high-voltage winding group 3 and the low-voltage winding group 4.

[0035] It should be noted that, before the present invention is used, the operator injects helium of the same pressure into the first cavity and the second cavity through the gas inlet and outlet valves, and then installs the box body 6 into the gap between the high-voltage winding group 3 and the low-voltage winding group 4 through the mounting frame 5, so that the box body 6 is flush with the outer surfaces of the high-voltage winding group 3 and the low-voltage winding group 4; when the dry-type transformer body 1 is working normally, the working temperature of the low-voltage winding group 4 will be higher than that of the high-voltage winding group 3. At this time, the helium inside the second cavity expands greatly due to the heat, and the piston plate 28 inside the second cavity drives the sliding column 29 moves close to the first cavity, the sliding column 29 drives the rotating plate 18 to rotate through the guide column 30 and the guide groove 31, the rotating plate 18 drives the first gear 19 to rotate through the rotating shaft, the first gear 19 drives the transmission shaft to rotate through the second gear 20, the transmission shaft drives the driving disk 21 to rotate in the direction close to the first cavity, the driving disk 21 drives the bottom end of the connecting rod 22 to deflect close to the low-voltage winding group 4 through the driving column 26 and the driving groove 25, so that it drives the temperature monitoring probe 24 to abut against the outer surface of the low-voltage winding group 4 through the second spring 23, so as to monitor the temperature of the low-voltage winding group 4. When the working temperature of the high-voltage winding group 3 suddenly rises, the temperature of the high-voltage winding group 3 is greater than or equal to the low-voltage winding group 4, and the sliding column 29 will move in the opposite direction. At this time, the temperature monitoring probe 24 is driven by the connecting rod 22 to be flush with the outer surface of the high-voltage winding group 3. When the temperature monitoring probe 24 is in the switching position, it will record the temperature of the low-voltage winding group 4. When it rotates to the position of the high-voltage winding group 3, the temperature of the high-voltage winding group 3 is detected and compared with the temperature of the low-voltage winding group 4. The temperature monitoring probe 24 and the temperature controller compare the data of the two. According to the comparison, it is judged whether the high-voltage winding group 3 and the low-voltage winding group 4 are within the normal temperature range. The device uses the same temperature monitoring probe 24 to detect the temperature of the high-voltage winding group 3 and the low-voltage winding group 4. When the temperature of the high-voltage winding group 3 is greater than or equal to the temperature of the low-voltage winding group 4, the temperature monitoring probe 24 will detect the temperature of the high-voltage winding group 3, avoiding the situation where the high-voltage coil temperature is much higher than the low-voltage coil temperature due to aging and damage of the two temperature monitoring probes 24 and is not monitored, thereby ensuring the working safety of the dry-type transformer body 1;When the temperature of the high-voltage winding group 3 is greater than or equal to that of the low-voltage winding group 4, the sliding column 29 drives the rotating plate 18 to rotate in the opposite direction, and the rotating plate 18 drives the turntable 11 to rotate through the rotating shaft, and the turntable 11 drives the arc convex strip 12 to rotate relative to the square slide bar 14. At this time, the end of the square slide bar 14 moves to the bottom end of the arc convex strip 12, and the other end of the square slide bar 14 leaves the slot of the rotating wheel 9 through the first spring 16, and the rotating wheel 9 is released from the limit. When the dry-type transformer body 1 is working, the heat is dissipated through the blast radiator 2, and the wind blown out by the blast radiator 2 will circulate in the gap between the high-voltage winding group 3 and the low-voltage winding group 4. Because the rotating wheel 9 is released from the limit, at this time, the wind blown out by the blast radiator 2 drives the driving fan 8 to rotate The fan 8 is driven to rotate the rotating wheel 9 through the rotating rod, and the rotating wheel 9 moves the elastic paddle 10 through the card slot on the surface. At this time, the elastic paddle 10 makes a sound. Through this device, a sound can be made when the temperature monitoring probe 24 rotates to the side of the high-voltage winding group 3, and the user is reminded of the abnormal working temperature of the dry-type transformer body 1 through the sound, which is convenient for the user to repair in time; the control mode of the electrical components in the present invention is controlled by the external controller matched with it, and the control circuit can be realized by simple programming by technicians in this field, which belongs to the common knowledge in this field, and is only used without improvement. In addition, the present invention is mainly used to protect mechanical devices, and the control mode and circuit connection are not explained in detail in this invention. ;

[0036] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A protective transformer, comprising a dry-type transformer body (1), characterized in that: Three high-voltage winding groups (3) are arranged inside the dry-type transformer body (1), and three low-voltage winding groups (4) are arranged inside the dry-type transformer body (1). The three low-voltage winding groups (4) are arranged inside the three high-voltage winding groups (3) respectively, and a gap is provided between the low-voltage winding groups (4) and the high-voltage winding groups (3). A plurality of insulators are arranged at the top of the three high-voltage winding groups (3), and a mounting frame (5) is fixedly mounted on the outer surface of the insulator. A box body (6) is fixedly mounted on the lower surface of the other end of the mounting frame (5), and two partitions (27) are symmetrically fixedly mounted on the inner wall of the box body (6). The box body (6) is divided into a first cavity, a second cavity and a third cavity by the two partitions (27). A cavity and a second cavity, wherein the cavity is arranged between the first cavity and the second cavity, the first cavity is arranged on a side of the box body (6) close to the high-voltage winding group (3), and the second cavity is arranged on a side of the box body (6) close to the low-voltage winding group (4), a piston plate (28) is slidably installed between the inner walls of the first cavity, and the same piston plate (28) is slidably installed between the inner walls of the second cavity, and a sliding column (29) is fixedly installed between the outer surfaces of adjacent sides of the two piston plates (28), and the sliding column (29) penetrates the outer surfaces of the two partitions (27) and is slidably installed therewith, and the outer surfaces of the opposite sides of the box body (6) are respectively flush with the outer surfaces of the high-voltage winding group (3) and the low-voltage winding group (4).

2. A protective transformer according to claim 1, characterized in that: The upper surface of the box body (6) is provided with an opening, the opening is communicated with the cavity, the upper surface of the mounting frame (5) is provided with a same opening, the upper surface of the mounting frame (5) is symmetrically fixedly provided with two support blocks (17), a rotating shaft is rotatably provided between the two support blocks (17), a rotating plate (18) is fixedly provided on the outer surface of the rotating shaft, the rotating plate (18) is arranged inside the cavity, a guide groove (31) is penetrated and provided at the bottom end of the rotating plate (18), a guide column (30) is fixedly provided on the outer surface of the sliding column (29), and the guide column (30) is slidably provided with the inner wall of the guide groove (31).

3. A protective transformer according to claim 2, characterized in that: One end of the rotating shaft passes through the outer surface of one of the supporting blocks (17) and is fixedly mounted with a first gear (19); a second gear (20) is rotatably mounted on the outer surface of the supporting block (17) close to the first gear (19); the second gear (20) is meshed with the first gear (19); a transmission shaft is fixedly mounted on the outer surface of the rotation center of the second gear (20); a driving disk (21) is fixedly mounted on the other end of the transmission shaft; a driving column (26) is fixedly mounted on the outer surface of the driving disk (21) away from the second gear (20); and the driving column (26) is arranged at an eccentric position of the driving disk (21).

4. A protective transformer according to claim 3, characterized in that: A connecting rod (22) is rotatably mounted on the end surface of the mounting frame (5) close to the driving disk (21); a driving groove (25) is provided on the outer surface of the connecting rod (22) close to the top; the driving column (26) is slidably mounted on the inner wall of the driving groove (25); a second spring (23) is fixedly mounted on the bottom end of the connecting rod (22); and a temperature monitoring probe (24) is fixedly mounted on the bottom end of the second spring (23).

5. A protective transformer according to claim 2, characterized in that: A bracket (7) is fixedly mounted on the lower surface of the mounting frame (5), a rotating rod is rotatably mounted on the upper surface of the bracket (7), the bottom end of the rotating rod passes through the lower surface of the bracket (7) and a driving fan (8) is fixedly mounted thereon, the top end of the rotating rod passes through the upper surface of the mounting frame (5) and a rotating wheel (9) is fixedly mounted thereon, a plurality of slots are evenly arranged on the circumferential outer surface of the rotating wheel (9), an elastic paddle (10) is fixedly mounted on the upper surface of the mounting frame (5), one end of the elastic paddle (10) abuts against the slot on the outer surface of the rotating wheel (9), and a blast heat sink (2) is arranged at the bottom of the dry-type transformer body (1).

6. A protective transformer according to claim 5, characterized in that: A fixing block (13) is fixedly mounted on the upper surface of the mounting frame (5) close to the bracket (7); a square hole is opened on the outer surface of the fixing block (13); a square slide bar (14) is slidably mounted on the inner wall of the square hole; a baffle (15) is fixedly mounted on the outer surface of the square slide bar (14) close to one end of the bracket (7); a first spring (16) is sleeved on the outer surface of the square slide bar (14); the first spring (16) is arranged between the baffle (15) and the fixing block (13); The other end of the rotating shaft passes through the outer surface of another supporting block (17) and is fixedly mounted with a rotating disk (11); an arc convex strip (12) is fixedly mounted on the outer surface of one side of the rotating disk (11); the arc convex strip (12) and the rotating disk (11) are arranged at the same center of a circle; one end of the arc convex strip (12) is higher than the other end; one end of the square sliding rod (14) abuts against the outer surface of the arc convex strip (12); and the other end of the square sliding rod (14) abuts against a slot on the outer surface of the rotating wheel (9).

7. A protective transformer according to claim 1, characterized in that: Gas inlet and outlet valves are fixedly mounted on the upper surfaces of the box body (6) located in the first cavity and the second cavity, and the two gas inlet and outlet valves are respectively connected to the inside of the first cavity and the second cavity.

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