High-voltage winding and dry-type transformer

Abstract

The invention discloses a high-voltage winding and a dry-type transformer, and particularly relates to the technical field of dry-type transformers, the high-voltage winding comprises a winding coil, a partition plate and an adjusting assembly, the partition plate and the winding coil are coaxially arranged, the outer wall of the partition plate and the inner wall of the winding coil form a first air duct for cooling and ventilation, and the adjusting assembly is arranged in the first air duct; the adjusting assembly can divide the first air channel into a plurality of ventilation areas in the circumferential direction of the winding coil, and the adjusting assembly can adjust the ventilation quantity of the ventilation areas according to the temperature in the winding coil. The cooling effect is further improved by mixing part of the cold airflow with the heated airflow, and meanwhile, the ventilation quantity of a plurality of ventilation areas is adjusted through the internal temperature of the high-voltage winding, so that the problem that the overall working efficiency is influenced by inconsistent internal temperature rise of the transformer winding due to nonuniform internal temperature distribution of a single winding is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of dry-type transformers, and more particularly to a high-voltage winding and a dry-type transformer. Background Art

[0002] A dry-type transformer is a type of transformer that does not rely on insulating oil, but instead uses air or solid insulating materials for cooling and insulation. It completely encapsulates the high-voltage winding, low-voltage winding, and iron core in a robust solid insulation structure. It offers significant advantages such as being oil-free, fireproof, explosion-proof, and maintenance-free. It is particularly suitable for locations with stringent safety and environmental requirements. Since there is no oil as a heat dissipation medium, dry-type transformers primarily rely on natural air cooling and forced air cooling.

[0003] However, in the prior art, when using a fan to dissipate heat from the transformer, the bottom serves as the cool air inlet and the top as the hot air outlet. This results in better cooling of the lower end of the winding, while the upper end is subjected to hot air rising from the lower air duct, resulting in poor cooling. This leads to uneven temperature rise across the winding. When the upper end reaches its temperature limit, the lower end still has significant room to rise. This inconsistent temperature rise can cause the transformer to fail to achieve its full load capacity.

[0004] Chinese patent application number 202410089318.5 discloses a high-voltage winding for a dry-type transformer and a dry-type transformer. The high-voltage winding includes several segmented windings, with adjacent segmented windings connected in series. Intersegment spacers are provided between the segmented windings, and the space between the segmented windings and the intersegment spacers forms a transverse airway. The segmented windings at both ends are respectively provided with high-voltage terminals and reinforced end insulation at the ends facing the yoke. The other ends of the segmented windings at both ends and the ends of the segmented winding in the middle are provided with segmented end insulation, and a tap terminal group is provided on any segmented winding. By segmenting the high-voltage winding, this invention forms transverse airways between the segmented windings, increasing the source of fresh air in the main airway and facilitating heat dissipation from the inside of the high-voltage winding and the outside of the low-voltage winding.

[0005] However, although the provision of a transverse air duct can alleviate the heat dissipation pressure on the upper end of the transformer winding to a certain extent, since the overall wind direction is from bottom to top, the air will gradually heat up during the heat dissipation process through the air duct, which will still lead to poor cooling effect on the upper end of the winding and a large temperature difference between the upper and lower ends of the transformer winding.

[0006] Moreover, during the operation of the transformer, multiple high-voltage windings and low-voltage windings are usually loaded at the same time, which will cause the temperature inside the winding close to the outside atmosphere to be lower, and the temperature close to the adjacent winding to be higher, resulting in uneven temperature distribution inside a single winding, which will lead to inconsistent temperature rise inside the transformer winding, thereby affecting the overall working efficiency. Therefore, the present invention proposes a high-voltage winding and a dry-type transformer to solve the above problems. Summary of the Invention

[0007] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a high-voltage winding and a dry-type transformer to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-voltage winding, comprising: a winding coil, a partition and an adjustment component, the partition being coaxially arranged with the winding coil, the outer wall of the partition and the inner wall of the winding coil forming a first air duct for cooling ventilation, the partition being able to allow part of the airflow at the air inlet of the first air duct to flow toward the inner wall of the partition; the adjustment component being arranged inside the first air duct, the adjustment component being able to divide the first air duct into multiple ventilation areas along the circumference of the winding coil, and the adjustment component being able to adjust the ventilation volume of the multiple ventilation areas according to the temperature inside the winding coil.

[0009] Preferably, the adjustment component includes an annular member arranged at the air inlet of the first air duct, and a plurality of ventilation holes are arranged in a circumferential array inside the annular member. A connecting member is fixedly connected between each two adjacent ventilation holes, and the ventilation area is enclosed by two adjacent connecting members and the annular member.

[0010] Preferably, an adjustment groove is provided inside each of the connecting parts, a rotating shaft is rotatably connected inside the adjusting groove, an adjustment plate is fixedly connected to the outer wall of the rotating shaft, a temperature sensing component is provided in each of the ventilation areas, two temperature sensing grooves are provided inside each of the connecting parts, both ends of the temperature sensing component respectively extend into the temperature sensing grooves provided in the corresponding two adjacent connecting parts, and each of the temperature sensing grooves is slidably connected to a sliding column at one end close to the adjusting plate, and one end of the sliding column is in contact with the adjusting plate.

[0011] Preferably, one end of the adjustment slot is connected to the first air duct, and the other end of the adjustment slot is connected to the adjacent ventilation area.

[0012] Preferably, a guide groove is provided at one end of the partition close to the air inlet of the first air duct, the guide groove passes through the partition, one end of the guide groove is fixedly connected to a guide member, and the guide member and the guide groove together constitute the third air duct.

[0013] Preferably, the third air duct passes through the partition, and the air inlet end of the third air duct is connected to the first air duct.

[0014] Preferably, a second air duct is transversely opened inside the winding coil at one end close to the air outlet of the first air duct, and there are multiple second air ducts corresponding to multiple ventilation areas, and the second air ducts are connected to the first air duct.

[0015] Preferably, a baffle is provided at one end of the first air duct outlet, and the baffle is fixedly connected to a plurality of connecting members.

[0016] Preferably, a plurality of fifth air ducts are provided in the inner circumferential array of the winding coils.

[0017] The present invention also provides a dry-type transformer, including a low-voltage winding, a base, a high-voltage winding, a first fan and a second fan, the two ends of the low-voltage winding and the high-voltage winding are fixedly connected to the base, the low-voltage winding and the inner wall of the partition form a fourth air duct, the air outlet end of the third air duct is connected to the fourth air duct, the first fan and the second fan generate airflows in different directions and flow through the first air duct and the fourth air duct respectively.

[0018] Technical effects and advantages of the present invention: The present invention cools the high-voltage winding and the low-voltage winding along the first duct, the fifth duct, the fourth duct and the sixth duct respectively through airflow in different directions, and mixes part of the cold airflow with the heated airflow through the third duct to further increase the cooling effect while preventing the problem of poor local cooling effect of the transformer. At the same time, the ventilation volume of multiple ventilation areas is adjusted by detecting the internal temperature of the high-voltage winding to prevent the uneven temperature distribution inside a single winding, thereby causing inconsistent temperature rise inside the transformer winding and affecting the overall working efficiency. The ventilation volume of the third duct is adjusted by the internal temperature of multiple ventilation areas, thereby adjusting the flow of the cooling airflow inside the first duct according to the internal temperature of the high-voltage winding, and further balancing the overall temperature rise of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the dry-type transformer of the present invention.

[0020] Figure 2 Schematic diagram of airflow direction of dry-type transformer in the prior art.

[0021] Figure 3 Schematic diagram of the airflow direction of the dry-type transformer in the present invention.

[0022] Figure 4 This is a cross-sectional view of the overall structure of the high-voltage winding of the present invention.

[0023] Figure 5 It is a structural schematic diagram of the partition and adjustment component of the present invention.

[0024] Figure 6This is a cross-sectional view of the structure of the adjustment groove of the present invention.

[0025] Figure 7 For the present invention Figure 4 A magnified view of the structure of part A.

[0026] Figure 8 For the present invention Figure 6 Enlarged view of the B structure.

[0027] The accompanying drawings are marked as follows: 1. Winding coil; 2. Partition; 21. First air duct; 22. Air guide; 23. Third air duct; 231. Wind shield; 24. Second air duct; 25. Fourth air duct; 3. Adjustment assembly; 31. Ventilation area; 32. Ring member; 321. Ventilation port; 33. Connector; 331. Adjustment slot; 332. Temperature sensing member; 333. Temperature sensing slot; 34. Adjustment plate; 341. Power connection member; 35. Baffle; 4. Low-voltage winding; 5. Base. DETAILED DESCRIPTION

[0028] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] Example 1 In actual production, due to the uneven temperature distribution inside a single winding, the temperature rise inside the transformer winding is inconsistent, thereby affecting the overall working efficiency. This embodiment is specially invented to solve the above problem.

[0030] See also Figures 1 to 8 As shown, a high-voltage winding according to an embodiment of the present invention includes a winding coil 1, a partition 2 and an adjusting component 3. The partition 2 is coaxially arranged with the winding coil 1. The outer wall of the partition 2 and the inner wall of the winding coil 1 form a first air duct 21 for cooling ventilation. The partition 2 can make part of the air flow at the air inlet of the first air duct 21 flow toward the inner wall of the partition 2; the adjusting component 3 is arranged inside the first air duct 21, and the adjusting component 3 can divide the first air duct 21 into multiple ventilation areas 31 along the circumference of the winding coil 1. The adjusting component 3 can adjust the ventilation volume of the multiple ventilation areas 31 according to the temperature inside the winding coil 1.

[0031] See also Figure 3 and Figure 5As shown, the adjustment component 3 includes a ring-shaped member 32 arranged at the air inlet of the first air duct 21, and a plurality of ventilation holes 321 are arranged in a circumferential array inside the ring-shaped member 32. A connecting member 33 is fixedly connected between each two adjacent ventilation holes 321, and the ventilation area 31 is enclosed by two adjacent connecting members 33 and the ring-shaped member 32. After the airflow enters the first air duct 21, it passes through the ventilation holes 321 and the adjustment groove 331 and enters different ventilation areas 31.

[0032] See also Figure 6 and Figure 8 As shown, an adjustment groove 331 is provided inside each connecting member 33, and a rotating shaft is rotatably connected inside the adjusting groove 331. The outer wall of the rotating shaft is fixedly connected to the adjustment plate 34. A temperature sensing part 332 is provided in each ventilation area 31, and two temperature sensing grooves 333 are provided inside each connecting member 33. The two ends of the temperature sensing part 332 extend to the temperature sensing grooves 333 provided in the two adjacent connecting members 33 respectively. One end of each temperature sensing groove 333 close to the adjustment plate 34 is slidably connected to a sliding column, and one end of the sliding column is in contact with the adjustment plate 34. Temperature sensing gas is provided inside the temperature sensing groove 333. When the temperature rises, the temperature sensing gas can expand to increase the internal pressure of the temperature sensing groove 333. This is the existing technology and will not be elaborated here.

[0033] See also Figure 8 As shown, one end of the adjustment slot 331 is connected to the first air duct 21 , and the other end of the adjustment slot 331 is connected to the adjacent ventilation area 31 . Electrical connectors 341 are symmetrically provided on both sides of the interior of the adjustment slot 331 .

[0034] See also Figure 4 and Figure 7 As shown, a guide groove is provided at one end of the partition 2 near the air inlet of the first air duct 21, the guide groove runs through the partition 2, one end of the guide groove is fixedly connected to a guide member 22, the guide member 22 and the guide groove together form a third air duct 23, a windshield groove is provided at one end of the partition 2 near the third air duct 23, a windshield 231 is fixedly connected to the windshield groove, an electromagnet is provided inside the windshield groove, the windshield 231 and the electromagnet are connected by magnetic force, the electromagnet is connected to the adjacent power receiving member 341 by electrical signal, wherein the power receiving member 341 is connected to the outside The power supply is connected. When the adjustment plate 34 contacts the power connection part 341, the power connection part 341 can energize the adjacent electromagnet. The third air duct 23 and the wind shield 231 are both multiple and correspond to multiple ventilation areas 31. When the electromagnet is energized, the electromagnet generates a thrust on the wind shield 231 so that the wind shield 231 changes the flow area of ​​the third air duct 23. Among them, the power connection part 341 can change the magnitude of the electromagnet current by rotating the adjustment plate 34, thereby changing the magnitude of the electromagnet magnetic force. This is existing technology and will not be repeated here.

[0035] See also Figure 3 and Figure 4 As shown, the third air duct 23 passes through the partition 2 , and the air inlet end of the third air duct 23 is connected to the first air duct 21 .

[0036] See also Figure 4 As shown, a second air duct 24 is horizontally opened at one end of the winding coil 1 near the air outlet of the first air duct 21. The second air duct 24 is multiple and corresponds to multiple ventilation areas 31. The second air duct 24 is connected to the first air duct 21. A baffle 35 is provided at one end of the air outlet of the first air duct 21. The baffle 35 is fixedly connected to multiple connecting members 33. Figure 3 As shown, a plurality of fifth air ducts are provided in a circumferential array inside the winding coil 1 .

[0037] When in use, the first fan is started to allow the air flow to flow upward from the bottom of the winding coil 1 through the fifth air duct and the first air duct 21, and part of the air flow enters the first air duct 21 through multiple adjustment grooves 331 and the vents 321. At the same time, the temperatures inside the corresponding ventilation areas 31 are detected by multiple temperature sensing elements 332. When the temperature rise of the multiple ventilation areas 31 is uneven, the temperature of the temperature sensing element 332 inside the ventilation area 31 with a high temperature is higher, which makes the temperature inside the corresponding temperature sensing groove 333 higher. The temperature sensing gas encapsulated in the temperature sensing groove 333 expands and the pressure increases, so that the expansion amount of the temperature sensing gas inside the temperature sensing groove 333 with a higher temperature is greater than the expansion amount of the temperature sensing gas inside the temperature sensing groove 333 with a lower temperature. The expansion volume makes the internal pressure of the temperature sensing tank 333 with a higher temperature greater than the internal pressure of the temperature sensing tank 333 with a lower temperature. The pressure difference drives the sliding column to slide to the side with a lower temperature, so that the sliding column pushes the adjustment plate 34, so that the adjustment plate 34 deflects to the side of the temperature sensing tank 333 with a lower temperature. When the airflow enters the first air duct 21 through the adjustment tank 331, the airflow inside the adjustment tank 331 is guided by the adjustment plate 34, so that more airflow enters the ventilation area 31 with a higher temperature, thereby increasing the cooling effect of the ventilation area 31 with a higher temperature, and preventing the uneven temperature distribution inside a single winding, which leads to the problem of inconsistent temperature rise inside the transformer winding affecting the overall working efficiency.

[0038] Example 2 On the basis of the above embodiments, this embodiment also provides a dry-type transformer, including a low-voltage winding 4, a base 5, a high-voltage winding, a first fan and a second fan, the two ends of the low-voltage winding 4 and the high-voltage winding are fixedly connected to the base 5, the low-voltage winding 4 and the inner wall of the partition 2 form a fourth air duct 25, the air outlet end of the third air duct 23 is connected to the fourth air duct 25, the first fan and the second fan are respectively arranged on both sides of the base 5, the first fan and the second fan generate airflows in different directions and flow through the first air duct 21 and the fourth air duct 25 respectively, and a sixth air duct is opened inside the low-voltage winding 4, wherein the first fan and the second fan generate airflows in different directions and enter different air ducts respectively, which is an existing technology, the first fan generates an upward airflow, and enters from the bottom of the first air duct 21 and the fifth air duct and flows to the top, the second fan generates a downward airflow, and enters from the top of the fourth air duct 25 and the sixth air duct and flows to the bottom.

[0039] When in use, start the first fan to make the air flow enter from the bottom of the high-voltage winding through the first air duct 21 and the fifth air duct and flow upward, and start the second fan to make the air flow enter from the top of the low-voltage winding 4 through the fourth air duct 25 and the sixth air duct and flow downward. Figure 2 and Figure 3 As shown, the high-voltage winding and the low-voltage winding 4 are cooled down along the first air duct 21, the fifth air duct, the fourth air duct 25, and the sixth air duct respectively through air flows in different directions, so as to prevent the air flow in a single direction from heating up during the flow, resulting in the problem of poor cooling effect on the upper part of the transformer. When the air flow flows to the upper end of the high-voltage winding through the first air duct 21, due to the obstruction of the baffle 35, the air flow flows out to the side of the high-voltage winding through the second air duct 24, preventing a large amount of air flow that heats up when passing through the first air duct 21 and the fifth air duct from gathering at the top of the high-voltage winding and flowing back to the fourth air duct 25. Figure 3As shown, when the air flow flows downward from the top of the low-voltage winding 4 through the fourth air duct 25, the air flow inside the fourth air duct 25 cools the inner surface of the top of the high-voltage winding. When the air flow flows upward from the bottom of the high-voltage winding through the first air duct 21, part of the air flow enters the third air duct 23 through the guide member 22 and flows to the fourth air duct 25. This part of the low-temperature air flow is mixed with the hot air flow from top to bottom inside the fourth air duct 25, thereby reducing the air flow temperature in the bottom area of ​​the fourth air duct 25. When the adjustment groove 331 adjusts the ventilation volume of multiple ventilation areas 31 through the adjustment plate 34, the adjustment plate 34 rotates inside the adjustment groove 331 toward the ventilation area 31 with higher temperature. When the adjustment plate 34 rotates to contact the internal electrical connection part 341 of the adjustment groove 331, the electromagnet inside the windshield groove is energized, so that the windshield part 231 at the ventilation area 31 slides upward inside the windshield groove, thereby allowing the third air duct 23 at the ventilation area 31 to circulate. The area decreases, and as the rotation distance of the adjustment plate 34 increases, the magnetic force of the electromagnet increases. When the adjustment plate 34 rotates to the extreme position, the temperature difference inside the multiple ventilation areas 31 is large, and the ventilation area 31 with a higher temperature requires more cooling airflow. At this time, the third air duct 23 of the ventilation area 31 is closed by the wind shield 231, so that more cooling airflow passes through the ventilation area 31 with a higher temperature to cool it, while the third air duct 23 corresponding to the ventilation area 31 with a lower temperature still remains in a ventilation state, cooling the airflow in the bottom area of ​​the fourth air duct 25, thereby preventing the low-voltage winding 4 from heating up during the flow from the top to the bottom due to the internal air flow of the fourth air duct 25, resulting in poor cooling effect at the bottom of the low-voltage winding 4 and inconsistent overall temperature rise of the low-voltage winding 4. At the same time, the ventilation condition of the third air duct 23 is adjusted according to the temperature in multiple ventilation areas 31 to further reduce the problem of uneven temperature inside a single winding.

[0040] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A high voltage winding, comprising a winding coil (1), characterized in that: Also includes: A partition (2), the partition (2) being coaxially arranged with the winding coil (1), the outer wall of the partition (2) and the inner wall of the winding coil (1) forming a first air duct (21) for cooling and ventilation, and the partition (2) enabling a portion of the air flow at the air inlet of the first air duct (21) to flow toward the inner wall of the partition (2); A regulating component (3) is provided inside the first air duct (21), the regulating component (3) is capable of dividing the first air duct (21) into a plurality of ventilation areas (31) along the circumference of the winding coil (1), and the regulating component (3) is capable of regulating the ventilation volume of the plurality of ventilation areas (31) according to the temperature inside the winding coil (1).

2. A high voltage winding according to claim 1, characterized in that: The regulating assembly (3) comprises an annular member (32) arranged at the air inlet of the first air duct (21), a plurality of ventilation openings (321) are arranged in a circumferential array inside the annular member (32), a connecting member (33) is fixedly connected between each two adjacent ventilation openings (321), and the ventilation area (31) is enclosed by the two adjacent connecting members (33) and the annular member (32).

3. A high voltage winding according to claim 2, characterized in that: An adjusting groove (331) is provided inside each of the connecting members (33), a rotating shaft is rotatably connected inside the adjusting groove (331), and an adjusting plate (34) is fixedly connected to the outer wall of the rotating shaft. A temperature sensing member (332) is provided in each of the ventilation areas (31), and two temperature sensing grooves (333) are provided inside each of the connecting members (33). Both ends of the temperature sensing member (332) extend into the temperature sensing grooves (333) provided inside the corresponding two adjacent connecting members (33), and one end of each of the temperature sensing grooves (333) close to the adjusting plate (34) is slidably connected to a sliding column, and one end of the sliding column is in contact with the adjusting plate (34).

4. A high voltage winding according to claim 3, characterized in that: One end of the adjustment slot (331) is connected to the first air duct (21), and the other end of the adjustment slot (331) is connected to the adjacent ventilation area (31). Electrical connection parts (341) are symmetrically provided on both sides of the interior of the adjustment slot (331).

5. A high voltage winding according to claim 4, characterized in that: A guide groove is provided at one end of the partition (2) near the air inlet of the first air duct (21), the guide groove passes through the partition (2), one end of the guide groove is fixedly connected to a guide member (22), the guide member (22) and the guide groove together form a third air duct (23), a wind shield groove is provided at one end of the partition (2) near the third air duct (23), the wind shield groove is fixedly connected to a wind shield member (231), an electromagnet is provided inside the wind shield groove, the wind shield member (231) and the electromagnet are connected by magnetic force, and the electromagnet is electrically connected to an adjacent power receiving member (341).

6. A high voltage winding according to claim 5, characterized in that: The third air duct (23) passes through the partition (2), and the air inlet end of the third air duct (23) is connected to the first air duct (21).

7. The high-voltage winding according to claim 6, characterized in that: A second air duct (24) is transversely opened at one end of the winding coil (1) near the air outlet of the first air duct (21), the second air duct (24) being multiple and corresponding to the multiple ventilation areas (31), and the second air duct (24) being connected to the first air duct (21).

8. The high-voltage winding according to claim 7, characterized in that: A baffle (35) is provided at one end of the air outlet of the first air duct (21), and the baffle (35) is fixedly connected to a plurality of connecting members (33).

9. The high-voltage winding according to claim 8, characterized in that: A plurality of fifth air ducts are provided in an internal circumferential array of the winding coil (1).

10. A dry-type transformer, comprising a low-voltage winding (4), a base (5), a high-voltage winding, a first fan and a second fan, wherein both ends of the low-voltage winding (4) and the high-voltage winding are fixedly connected to the base (5), characterized in that: The high-voltage winding adopts a high-voltage winding according to any one of claims 9, the low-voltage winding (4) and the inner wall of the partition (2) form a fourth air duct (25), the air outlet end of the third air duct (23) is connected to the fourth air duct (25), and the first fan and the second fan generate airflows in different directions and flow through the first air duct (21) and the fourth air duct (25) respectively.

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