A high-voltage winding and dry-type transformer

Abstract

The application discloses a high-voltage winding and a dry-type transformer, and particularly relates to the technical field of dry-type transformers, and comprises a winding coil, a partition plate and an adjusting assembly, the partition plate is coaxially arranged with the winding coil, the outer wall of the partition plate and the inner wall of the winding coil form a first air duct for cooling and ventilation, the adjusting assembly is arranged inside the first air duct, the adjusting assembly can divide the first air duct into multiple ventilation areas along the circumference of the winding coil, and the adjusting assembly can adjust the ventilation volume of the multiple ventilation areas according to the temperature inside the winding coil, the high-voltage winding and the low-voltage winding are cooled by airflows in different directions, and the cooling effect is further increased by mixing part of the cold airflows with the airflows after being heated, meanwhile, the ventilation volume of the multiple ventilation areas is adjusted by the temperature inside the high-voltage winding, so that the problem that the temperature distribution inside a single winding is uneven and the temperature rise inside the transformer winding is inconsistent to affect the overall working efficiency is prevented.

Description

TECHNICAL FIELD

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

[0002] A dry-type transformer is a transformer that does not rely on insulating oil and uses air or solid insulation material for cooling and insulation. It completely encapsulates the high-voltage winding, low-voltage winding, and iron core in a solid insulation structure, has the advantages of being oil-free, fireproof, explosion-proof, and maintenance-free, and is particularly suitable for places with extremely high safety and environmental requirements. Since there is no oil as a heat dissipation medium, the dry-type transformer mainly relies on natural air cooling and forced air cooling for heat dissipation.

[0003] However, in the prior art, when a fan is used to cool the transformer, the bottom is the cold air inlet and the top is the hot air outlet. The lower end of the winding is well cooled, while the upper part of the winding is affected by the hot air rising from the lower part of the air duct, resulting in poor cooling effect. This leads to uneven overall temperature rise of the winding, and when the upper end reaches the temperature limit, the lower end still has a large temperature rise space, resulting in inconsistent temperature rise and thus the transformer cannot exert its full load capacity.

[0004] A high-voltage winding for a dry-type transformer and a dry-type transformer are disclosed in Chinese Patent No. 202410089318.5. The high-voltage winding includes a plurality of segmented windings, adjacent segmented windings are connected in series, and segment pads are provided between the segmented windings. The space between the segmented windings and the segment pads forms a transverse air duct. The segmented windings at both ends are provided with high-voltage terminals and reinforced end insulation at one end facing the yoke. The other end of the segmented windings at both ends and the ends of the segmented windings in the middle are provided with segmented end insulation. The tap terminal group is arranged on any one of the segmented windings. The invention divides the high-voltage winding into segments, forms a transverse air duct between the segmented windings, increases the source of fresh air for the main air duct, and is more conducive to heat dissipation on the inside of the high-voltage winding and the outside of the low-voltage winding.

[0005] However, although the transverse air duct can alleviate the cooling pressure on the upper end of the transformer winding to some extent, the overall air flow is from bottom to top, and the air will gradually warm up during the heat dissipation process through the air duct, still resulting in 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] And, in the process of transformer working, usually by multiple high-voltage winding and low-voltage winding load at the same time, which can cause winding inside near the outside atmosphere side of the lower temperature, near the adjacent winding side of the higher temperature, cause single winding inside temperature distribution uneven, can cause transformer winding inside temperature rise is inconsistent, and further influence the overall work efficiency, so the present application proposes a kind of high-voltage winding and dry-type transformer to solve the above problems. SUMMARY

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

[0008] To achieve the above object, the present application provides the following technical solution: a high-voltage winding, comprising: winding coil, partition and adjusting assembly, the partition is coaxially arranged with the winding coil, the outer wall of the partition and the inner wall of the winding coil form a first air duct for cooling and ventilation, the partition can make part of the airflow at the air inlet of the first air duct flow to the inner wall of the partition; the adjusting assembly is arranged inside the first air duct, the adjusting assembly can divide the first air duct into a plurality of ventilation areas along the circumference of the winding coil, and the adjusting assembly can adjust the ventilation volume of the plurality of ventilation areas according to the temperature inside the winding coil.

[0009] Preferably, the adjusting assembly comprises a ring-shaped member arranged at the air inlet of the first air duct, a plurality of air vents are arranged in the ring-shaped member in a circumferential array, and a connecting member is fixedly connected between each two adjacent air vents, and the ventilation area is enclosed by the adjacent two connecting members and the ring-shaped member.

[0010] Preferably, an adjusting groove is formed in the inner portion of each connecting member, a rotating shaft is rotatably connected in the adjusting groove, an adjusting plate is fixedly connected to the outer wall of the rotating shaft, a temperature sensing member is arranged in each ventilation area, two temperature sensing grooves are formed in the inner portion of each connecting member, the temperature sensing member extends into the temperature sensing grooves formed in the inner portion of the adjacent two connecting members at both ends thereof, and a slide column is slidably connected to the end of each temperature sensing groove close to the adjusting plate.

[0011] Preferably, one end of the adjusting groove is in communication with the first air duct, and the other end of the adjusting groove is in communication with the adjacent ventilation area.

[0012] Preferably, a flow guide groove is formed in the end of the partition close to the air inlet of the first air duct, the flow guide groove penetrates the partition, a flow guide member is fixedly connected to one end of the flow guide groove, and the flow guide member and the flow guide groove together form a third air duct.

[0013] Preferably, the third air duct penetrates the partition, and the air inlet end of the third air duct is in communication with the first air duct.

[0014] Preferably, a second air duct is transversely arranged at one end of the winding coil close to the air outlet of the first air duct, the second air duct is multiple and corresponds to the multiple ventilation areas, and the second air duct is in communication with the first air duct.

[0015] Preferably, a baffle is arranged at one end of the air outlet of the first air duct, and the baffle is fixedly connected with the multiple connecting pieces.

[0016] Preferably, multiple fifth air ducts are arranged in a circumferential array in the interior of the winding coil.

[0017] The application also provides a dry-type transformer, which comprises a low-voltage winding, a base, a high-voltage winding, a first air fan and a second air fan, two ends of the low-voltage winding and the high-voltage winding are fixedly connected with the base, the low-voltage winding and the inner wall of the partition plate form a fourth air duct, the air outlet end of the third air duct is in communication with the fourth air duct, the first air fan and the second air fan generate air flows in different directions and flow through the first air duct and the fourth air duct, respectively.

[0018] The technical effects and advantages of the application are as follows:

[0019] The application cools the high-voltage winding and the low-voltage winding by air flows in different directions along the first air duct, the fifth air duct, the fourth air duct and the sixth air duct, respectively, mixes part of the cold air flow with the air flow after being heated through the third air duct to further increase the cooling effect and prevent the problem of poor local cooling effect of the transformer, adjusts the ventilation volume of the multiple ventilation areas by detecting the internal temperature of the high-voltage winding to prevent the problem of uneven internal temperature distribution of a single winding, which leads to inconsistent internal temperature rise of the transformer winding and affects the overall working efficiency, and adjusts the ventilation volume of the third air duct by the internal temperature of the multiple ventilation areas to adjust the flow of the cooling air flow in the first air duct according to the internal temperature of the high-voltage winding, thereby further balancing the overall temperature rise of the transformer. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the dry-type transformer of the application.

[0021] Figure 2 It is a schematic diagram of the air flow direction of the dry-type transformer in the prior art.

[0022] Figure 3 It is a schematic diagram of the air flow direction of the dry-type transformer in the application.

[0023] Figure 4 It is a sectional view of the overall structure of the high-voltage winding of the application.

[0024] Figure 5 It is a schematic diagram of the structure of the partition plate and the adjusting assembly of the application.

[0025] Figure 6 This is a cross-sectional view of the structure of the adjusting groove in this invention.

[0026] Figure 7 For the present invention Figure 4 Enlarged view of the structure of part A.

[0027] Figure 8 For the present invention Figure 6 Enlarged view of the structure of part B.

[0028] The attached diagram is labeled as follows: 1. Winding coil; 2. Partition; 21. First air duct; 22. Air guide; 23. Third air duct; 231. Wind baffle; 24. Second air duct; 25. Fourth air duct; 3. Adjustment component; 31. Ventilation area; 32. Ring component; 321. Ventilation opening; 33. Connector; 331. Adjustment groove; 332. Temperature sensing component; 333. Temperature sensing groove; 34. Adjustment plate; 341. Electrical connection component; 35. Baffle; 4. Low-voltage winding; 5. Base. Detailed Implementation

[0029] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] In actual production, uneven temperature distribution within a single winding leads to inconsistent temperature rise within the transformer winding, thus affecting overall working efficiency. This embodiment is invented to solve the above problem.

[0032] Please see 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 adjustment 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 and ventilation. The partition 2 enables a portion of the airflow at the air inlet of the first air duct 21 to flow towards the inner wall of the partition 2. The adjustment component 3 is disposed inside the first air duct 21. The adjustment component 3 can divide the first air duct 21 into multiple ventilation areas 31 along the circumference of the winding coil 1. The adjustment component 3 can adjust the ventilation volume of the multiple ventilation areas 31 according to the temperature inside the winding coil 1.

[0033] Please see Figure 3 and Figure 5As shown, the adjusting assembly 3 comprises a ring 32 arranged at the air inlet of the first air duct 21, a plurality of air vents 321 are arranged in the ring 32 in a circumferential array, and a connecting piece 33 is fixedly connected between each two adjacent air vents 321, and the air vent area 31 is enclosed by the adjacent connecting pieces 33 and the ring 32, wherein the airflow enters the first air duct 21, passes through the air vents 321 and the adjusting groove 331, and enters the different air vent areas 31.

[0034] As shown in Figure 6 and Figure 8 each connecting piece 33 is internally provided with an adjusting groove 331, a rotating shaft is rotatably connected in the adjusting groove 331, and an adjusting plate 34 is fixedly connected to the outer wall of the rotating shaft, a temperature sensing piece 332 is arranged in each air vent area 31, two temperature sensing grooves 333 are arranged in each connecting piece 33, the two ends of the temperature sensing piece 332 extend into the temperature sensing grooves 333 arranged in the adjacent connecting pieces 33, and a sliding column is slidably connected to the end of each temperature sensing groove 333 close to the adjusting plate 34, wherein the temperature sensing column is in contact with the adjusting plate 34, and the temperature sensing groove 333 is internally provided with a temperature sensing gas, which can expand to increase the internal pressure of the temperature sensing groove 333 when the temperature rises. This is a prior art and will not be described in detail here.

[0035] As shown in Figure 8 one end of the adjusting groove 331 is communicated with the first air duct 21, the other end of the adjusting groove 331 is communicated with the adjacent air vent area 31, and the adjusting groove 331 is internally provided with two symmetrical power connection pieces 341.

[0036] As shown in Figure 4 and Figure 7 a flow guide groove is arranged in one end of the partition plate 2 close to the air inlet of the first air duct 21, the flow guide groove penetrates the partition plate 2, a flow guide piece 22 is fixedly connected to one end of the flow guide groove, the flow guide piece 22 and the flow guide groove together form a third air duct 23, a wind blocking groove is arranged in one end of the partition plate 2 close to the third air duct 23, a wind blocking piece 231 is fixedly connected in the wind blocking groove, an electromagnet is arranged in the wind blocking groove, the wind blocking piece 231 and the electromagnet are connected by magnetic force, and the electromagnet is electrically connected with the adjacent power connection piece 341, wherein the power connection piece 341 is connected with an external power source, the power connection piece 341 can energize the adjacent electromagnet when the adjusting plate 34 is in contact with the power connection piece 341, the third air duct 23 and the wind blocking piece 231 are both multiple and correspond to the multiple air vent areas 31, and the electromagnet generates a thrust on the wind blocking piece 231 to change the flow area of the third air duct 23 when the electromagnet is energized, wherein the power connection piece 341 can change the current of the electromagnet by rotating the adjusting plate 34 to change the magnetic force of the electromagnet, this is a prior art and will not be described in detail here.

[0037] As shown inFigure 3 and Figure 4 As shown, the third air duct 23 penetrates the partition 2, and the air inlet of the third air duct 23 is connected to the first air duct 21.

[0038] Please see Figure 4 As shown, a second air duct 24 is laterally opened inside the winding coil 1 near the air outlet of the first air duct 21. There are multiple second air ducts 24, each corresponding to a different ventilation area 31. The second air ducts 24 are 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 connectors 33. Figure 3 As shown, the internal circumferential array of winding coil 1 is provided with multiple fifth air ducts.

[0039] During operation, the first fan is activated, causing airflow to flow upwards from the bottom of the winding coil 1 through the fifth air duct and the first air duct 21. Part of the airflow enters the first air duct 21 through multiple regulating slots 331 and vents 321. Simultaneously, multiple temperature sensors 332 detect the temperature inside the corresponding ventilation areas 31. When the temperature rise in the multiple ventilation areas 31 is uneven, the temperature of the temperature sensor 332 inside the higher-temperature ventilation area 31 is higher, resulting in a higher temperature inside the corresponding temperature sensing slot 333. The temperature-sensing gas encapsulated inside the temperature sensing slot 333 expands, increasing its pressure. This causes the expansion of the temperature-sensing gas inside the higher-temperature temperature sensing slot 333 to be greater than that inside the lower-temperature temperature sensing slot 333. The expansion difference causes the pressure inside the higher-temperature sensing groove 333 to be greater than that inside the lower-temperature sensing groove 333. This pressure difference drives the sliding column to slide towards the lower-temperature side, which in turn pushes the adjusting plate 34. This causes the adjusting plate 34 to deflect towards the lower-temperature sensing groove 333. As the airflow enters the first air duct 21 through the adjusting groove 331, the airflow inside the adjusting groove 331 is guided by the adjusting plate 34, allowing more airflow to enter the higher-temperature ventilation area 31. This increases the cooling effect of the higher-temperature ventilation area 31 and prevents uneven temperature distribution inside a single winding, which could lead to inconsistent temperature rise inside the transformer winding and affect the overall working efficiency.

[0040] Example 2

[0041] On the basis of the above-mentioned embodiments, the present embodiment further provides a dry-type transformer, comprising a low-voltage winding 4, a base 5, a high-voltage winding, a first fan and a second fan, both ends of the low-voltage winding 4 and the high-voltage winding are fixedly connected with the base 5, the low-voltage winding 4 and the inner wall of the partition plate 2 form a fourth air duct 25, the air outlet end of the third air duct 23 and the fourth air duct 25 are communicated, 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 respectively flow through the first air duct 21 and the fourth air duct 25, and the low-voltage winding 4 is internally provided with a sixth air duct, wherein the first fan and the second fan generate airflows in different directions and respectively enter different air ducts, the first fan generates upward flowing air, and the air flows into the top from the bottom of the first air duct 21 and the fifth air duct, the second fan generates downward flowing air, and the air flows into the bottom from the top of the fourth air duct 25 and the sixth air duct.

[0042] In use, the first fan is started to make the airflow pass through the first air duct 21 and the fifth air duct from the bottom of the high-voltage winding to flow upward, and the second fan is started to make the airflow pass through the fourth air duct 25 and the sixth air duct from the top of the low-voltage winding 4 to flow downward, in combination with Figure 2 and Figure 3 As shown, the high-voltage winding and the low-voltage winding 4 are cooled by airflows in different directions along the first air duct 21, the fifth air duct, the fourth air duct 25 and the sixth air duct, preventing the problem that the airflow in a single direction is heated during flowing and resulting in poor cooling effect on the upper part of the transformer, when the airflow flows to the upper end of the high-voltage winding through the first air duct 21, the airflow flows out to the side of the high-voltage winding through the second air duct 24 due to the blocking of the baffle 35, preventing a large amount of heated airflows 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, in combination with Figure 3As shown, when the air current flows downward from the top of the low-voltage winding 4 through the fourth air duct 25, the air current inside the fourth air duct 25 cools the inner surface of the top of the high-voltage winding; when the air current flows upward from the bottom of the high-voltage winding through the first air duct 21, part of the air current enters the third air duct 23 through the flow guide 22 and flows to the fourth air duct 25, and the part of the low-temperature air current mixes with the hot air current flowing downward inside the fourth air duct 25, thereby reducing the temperature of the air current in the bottom region of the fourth air duct 25; when the adjusting groove 331 adjusts the air volume of the plurality of air vent regions 31 through the adjusting plate 34, the adjusting plate 34 rotates inside the adjusting groove 331 to the air vent region 31 with a higher temperature; when the adjusting plate 34 rotates to contact the electrical contact 341 inside the adjusting groove 331, the electromagnet inside the air baffle groove is energized, so that the air baffle 231 at the air vent region 31 slides upward inside the air baffle groove, thereby reducing the flow area of the third air duct 23 at the air vent region 31; as the rotation distance of the adjusting plate 34 increases, the magnetic force of the electromagnet increases; when the adjusting plate 34 rotates to the limit position, at this time, the temperature difference between the plurality of air vent regions 31 is large, and the air vent region 31 with a higher temperature needs more cooling air current; at this time, the third air duct 23 of the air vent region 31 is closed by the air baffle 231, so that more cooling air current flows through the air vent region 31 with a higher temperature to cool it, while the third air duct 23 corresponding to the air vent region 31 with a lower temperature remains in a ventilating state, and the air current in the bottom region of the fourth air duct 25 is cooled, thereby preventing the problem that the bottom of the low-voltage winding 4 is poorly cooled due to the temperature rise of the air current flowing from the top to the bottom of the low-voltage winding 4 inside the fourth air duct 25, resulting in inconsistent temperature rise of the low-voltage winding 4 as a whole; and the ventilation state of the third air duct 23 is adjusted according to the temperature in the plurality of air vent regions 31, thereby further reducing the problem of uneven temperature inside a single winding.

[0043] The above description is only the preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solution and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application.

Claims

1. A high-voltage winding comprising a winding coil (1), characterized in that, Also include: The partition (2) is coaxial with the winding coil (1), the outer wall of the partition (2) and the inner wall of the winding coil (1) form the first air duct (21) for cooling ventilation, the partition (2) can make the part of the airflow at the air inlet of the first air duct (21) flow to the inner wall of the partition (2); The adjusting assembly (3) is arranged inside the first air duct (21), the adjusting assembly (3) can divide the first air duct (21) into a plurality of ventilation areas (31) along the circumference of the winding coil (1), and the adjusting assembly (3) can adjust the ventilation volume of the plurality of ventilation areas (31) according to the temperature inside the winding coil (1); The adjusting assembly (3) includes a ring (32) arranged at the air inlet of the first air duct (21), a plurality of air vents (321) are arranged in the ring (32) in a circumferential array, and a connecting piece (33) is fixedly connected between every two adjacent air vents (321), and the ventilation area (31) is enclosed by the adjacent two connecting pieces (33) and the ring (32); An adjusting groove (331) is arranged in the inner portion of each connecting piece (33), a rotating shaft is rotatably connected in the adjusting groove (331), an adjusting plate (34) is fixedly connected to the outer wall of the rotating shaft, a temperature sensing piece (332) is arranged in each ventilation area (31), two temperature sensing grooves (333) are arranged in the inner portion of each connecting piece (33), the temperature sensing piece (332) extends into the temperature sensing grooves (333) arranged in the inner portion of the adjacent two connecting pieces (33) respectively, and a slide column is slidably connected to one end of each temperature sensing groove (333) close to the adjusting plate (34).

2. A high voltage winding according to claim 1, characterized in that: One end of the adjusting groove (331) is communicated with the first air duct (21), and the other end of the adjusting groove (331) is communicated with the adjacent ventilation area (31).

3. A high voltage winding according to claim 2, characterized in that: A guide groove is arranged in the inner portion of the partition (2) close to the air inlet of the first air duct (21), the guide groove penetrates the partition (2), a guide piece (22) is fixedly connected to one end of the guide groove, and the guide piece (22) and the guide groove jointly form a third air duct (23).

4. A high voltage winding according to claim 3, characterized in that: The third air duct (23) penetrates the partition (2), and the air inlet end of the third air duct (23) is communicated with the first air duct (21).

5. A high voltage winding according to claim 4, characterized in that: A second air duct (24) is horizontally arranged in the inner portion of the winding coil (1) close to the air outlet of the first air duct (21), the second air duct (24) is a plurality of and corresponds to the plurality of ventilation areas (31), and the second air duct (24) is communicated with the first air duct (21).

6. A high voltage winding according to claim 5, characterized in that: A baffle (35) is arranged at one end of the air outlet of the first air duct (21), and the baffle (35) is fixedly connected with the plurality of connecting pieces (33).

7. A high voltage winding according to claim 6, characterized in that: A plurality of fifth air ducts are arranged in a circumferential array in the inner portion of the winding coil (1).

8. A dry-type transformer comprising a low-voltage winding (4), a base (5), a high-voltage winding, a first fan and a second fan, both ends of the low-voltage winding (4) and the high-voltage winding being fixedly connected with the base (5), characterized in that, The high-voltage winding adopts the high-voltage winding of claim 7, the low-voltage winding (4) and the inner wall of the partition plate (2) form a fourth air duct (25), the air outlet end of the third air duct (23) and the fourth air duct (25) are communicated, and the first fan and the second fan generate airflow in different directions and respectively flow through the first air duct (21) and the fourth air duct (25).

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