Dry-type transformer convenient for heat dissipation and cooling

Abstract

The invention belongs to the field of transformers, and provides a dry-type transformer convenient for heat dissipation and cooling, the dry-type transformer comprises an iron core, an epoxy resin pouring coil, an upper clamp, a lower clamp, a bottom groove and trundles, the top of the bottom groove is provided with two groups of fan sets distributed on the front and rear sides of the iron core, each fan set comprises three fans distributed in a triangle shape, and the fans are arranged in the bottom groove. Wherein the axial directions of two fans are located on the same axis, the axial direction of the other fan is perpendicular to the axial directions of the other two fans, the lower half part of the cooling air channel is provided with a connecting rib, the upper half part of the cooling air channel is provided with four ceramic linings forming an annular structure in a surrounding mode, and each ceramic lining comprises an air outlet hole, a connecting column and a nut piece. A ceramic cover is arranged on the outer side of the top of the epoxy resin pouring coil and comprises a cover body section and a framework section. The transformer insulation material is reasonable in design, high in structural stability, beneficial for improving the transformer capacity and prolonging the actual service life of the transformer insulation material, and suitable for large-scale popularization.

Description

Technical Field

[0001] The invention belongs to the field of transformers, and in particular relates to a dry-type transformer which is convenient for heat dissipation and cooling. Background Art

[0002] Transformers mainly increase the low voltage generated by power stations to high voltage for long-distance transmission to reduce the loss of electricity during transmission. When reaching the user end, the high voltage is reduced to a low voltage suitable for electrical appliances. According to the cooling medium, they can be divided into dry-type transformers, oil-immersed transformers and gas-filled transformers. Among them, dry-type transformers do not have oil medium, and there are no safety hazards such as oil leakage and fire. They can be directly operated at the load center and are suitable for indoor and some places with high fire protection requirements. In addition, dry-type transformers are generally used and installed in combination with switch cabinets.

[0003] Since the iron core of the transformer will generate a lot of heat during operation, heat dissipation is usually used to ensure the working performance of the transformer. Regarding the heat dissipation and cooling methods of dry-type transformers, there are mainly natural air cooling and forced air cooling. Some large-capacity dry-type transformers will also appropriately use oil circuits to assist heat dissipation. The existing patent CN217507058U discloses a dry-type transformer with good heat dissipation effect, including an iron core, an upper fixing clip, a coil and a lower fixing clip, the upper fixing clip and the lower fixing clip correspondingly clamp the upper and lower parts of the iron core; the three vertical core bodies of the iron core are all sleeved with coils, the coils include low-voltage windings and high-voltage windings, and there is a gap between the outer wall of the low-voltage winding and the inner wall of the high-voltage winding, and the gap is a cooling chamber; the lower fixing clip is provided with three cooling shells for correspondingly supporting the coils, the cooling shell is sleeved on the outer wall of the vertical core body of the iron core, and the side of the cooling shell that contacts the lower part of the coil is provided with an annular groove. The transformer blows air into the inner cavity of the cooling shell through a fan, and the wind enters the cooling chamber through the annular groove, so that the low-voltage winding and the high-voltage winding can be blown and cooled. However, due to the heavy mass of the transformer silicon steel sheets (iron core), high-voltage windings and low-voltage windings, the pressure load on the cooling shell is large, and deformation problems are prone to occur; furthermore, since cast epoxy resin is used as the main insulation on the outside of the high-voltage winding and the low-voltage winding, the heat dissipation effect of the main insulation material will no longer be improved when the wind force reaches a certain level. Instead, it will increase the overall working noise of the transformer and may even cause mechanical stress to the insulation material, which may affect the physical properties and actual service life of the insulation material under long-term action. Summary of the invention

[0004] The present invention aims at solving the technical problems existing in heat dissipation and cooling of the above-mentioned dry-type transformer, and proposes a dry-type transformer which is convenient for heat dissipation and cooling and has reasonable design, high structural stability, is beneficial to improving transformer capacity and extending the actual service life of transformer insulation materials.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is that the present invention provides a dry-type transformer that is easy to dissipate heat and cool, including an iron core, the iron core includes three iron core columns and an iron yoke for connecting the three iron core columns, the iron core column is provided with an epoxy resin cast coil, the epoxy resin cast coil includes a concentrically distributed low-voltage winding, a cooling air duct and a high-voltage winding, a pad is provided at the bottom of the high-voltage winding, an upper clamp and a lower clamp are provided above and below the iron core respectively, a bottom groove is provided below the lower clamp, and casters are provided inside the bottom groove, characterized in that two groups of fan groups distributed on the front and rear sides of the iron core are provided at the top of the bottom groove, and the fan group includes three fan groups distributed in a herringbone shape. The fan, wherein the axial directions of two fans are located on the same axis, and the axial direction of another fan is perpendicular to the axial directions of the other two fans, the lower half of the cooling air duct is provided with connecting ribs distributed in a circular array, the upper half of the cooling air duct is provided with 4 ceramic bushings surrounded by a ring structure, the top of the ceramic bushing is provided with a plurality of air outlet holes, a pair of connecting columns are provided at both ends of the top of the ceramic bushing and close to the position of the adjacent ceramic bushing, nuts are provided on the connecting columns, a ceramic cover is provided on the outer side of the top of the epoxy resin cast coil, the ceramic cover includes an annular cover body section, the top of the cover body section is provided with a pair of skeleton sections cooperating with the connecting columns, and the skeleton sections are provided with connecting holes.

[0006] Preferably, the fan group also includes three sections of air ducts arranged in a straight line, and the surface of the air duct is provided with a plurality of ventilation strip holes distributed along the length direction thereof, wherein two fans are arranged at both ends of the three sections of air ducts, and the other fan is arranged in the middle of the air duct located in the middle position, and a guide fin group is arranged between adjacent air ducts, the guide fin group includes a plurality of guide fins and internal ribs for connecting the guide fins, and the gap formed by adjacent guide fins faces the insulating gap formed by adjacent core columns.

[0007] Preferably, the guide fins are of a square structure and are provided with ventilation openings in the middle thereof, and the ventilation openings on adjacent guide fins gradually become smaller toward the middle of the core.

[0008] Preferably, the ceramic bushing comprises three layers of concentrically distributed curved plates, the radial projection of the curved plates presents an inverted trapezoidal structure, the curved plates are provided with a plurality of evenly distributed radial connecting holes near the bottom thereof, and the radial connecting holes are provided with ceramic reinforcing columns connecting the three curved plates.

[0009] Preferably, the cover body section is provided with an inlay which cooperates with the outer protruding section of the high-voltage winding.

[0010] Preferably, a pair of side guide plates are provided at both ends of the upper clamp, the side guide plates are provided with an upper guide opening and a lower guide opening, the upper guide opening is provided with an air duct, the end of the air duct away from the iron core is used to connect with the inner wall of the switch cabinet, and the interior of the air duct is provided with a plurality of cooling fins distributed in a circular array.

[0011] Preferably, the air duct comprises a lip plate welded to the upper guide port, a lip opening is arranged at the end of the lip plate, and a cylinder body nested with the lip opening is arranged at one end of the lip plate away from the iron core.

[0012] Preferably, a vertical opening opposite to the epoxy resin casting coil is provided in the middle of the side guide plate, and two side wings distributed in an eight-shaped shape are provided on both sides of the vertical opening.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are:

[0014] The present invention provides a dry-type transformer that is easy to dissipate heat and cool. The distribution position of the fan in the fan unit is designed in a coordinated manner to improve the flow effect of air around and inside the epoxy resin casting coil, and a ceramic bushing and a ceramic cover are arranged on the upper part of the epoxy resin casting coil. The thermal conductivity of the ceramic bushing and the ceramic cover can further improve the efficiency of heat exchange from the iron core and the inside of the epoxy resin casting coil to the outside, and to a certain extent, the mechanical damage of the wind to the insulating material of the epoxy resin casting coil can be reduced. The device has a reasonable design, high structural stability, is conducive to increasing the capacity of the transformer and extending the actual service life of the transformer insulation material, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 An axonometric diagram of a dry-type transformer that facilitates heat dissipation and cooling provided in an embodiment;

[0017] Figure 2 An axonometric diagram of a dry-type transformer that is convenient for heat dissipation and cooling provided in an embodiment in another direction;

[0018] Figure 3 A front view of a dry-type transformer that facilitates heat dissipation and cooling provided in an embodiment;

[0019] Figure 4 Axonometric view of epoxy-cast coils, ceramic bushings, and ceramic covers;

[0020] Figure 5 Front view of epoxy resin cast coil, ceramic bushing and ceramic cover;

[0021] Figure 6 It is a cross-sectional view of the epoxy resin casting coil, ceramic bushing and ceramic cover in the GG direction;

[0022] Figure 7 It is a cross-sectional view of the epoxy resin casting coil, ceramic bushing and ceramic cover in the EE direction;

[0023] Figure 8 A cross-sectional view of a fan unit provided in an embodiment;

[0024] Fig. 9 An exploded view of a ceramic bushing and a ceramic cover provided in an embodiment;

[0025] Fig.10 A schematic diagram of a combination of a ceramic bushing and a ceramic cover provided in an embodiment;

[0026] In the above figures, 1, iron core; 2, epoxy resin casting coil; 21, low voltage winding; 22, cooling air duct; 23, high voltage winding; 24, pad; 25, connecting rib; 3, upper clamp; 4, lower clamp; 5, bottom groove; 6, caster; 7, fan group; 71, fan; 72, air duct; 73, ventilation strip hole; 74, guide fin group; 741, guide fin; 742, inner rib; 743, vent; 8, ceramic Bushing; 81, air outlet; 82, connecting column; 83, nut; 84, curved plate; 85, radial connecting hole; 86, ceramic reinforcing column; 9, ceramic cover; 91, cover body section; 92, frame section; 93, inlay; 10, side guide plate; 101, upper guide port; 102, lower guide port; 103, air cylinder; 1031, lip plate; 1032, cylinder; 104, heat dissipation fin; 105, vertical opening; 106, side wing. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the accompanying drawings themselves, and do not limit the structure.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0029] Examples, such as Figure 1-Figure 10 As shown, the present invention provides a dry-type transformer that is easy to dissipate heat and cool, including an iron core 1, the iron core 1 includes three iron core columns and an iron yoke for connecting the three iron core columns, an epoxy resin casting coil 2 is arranged on the iron core column, the epoxy resin casting coil 2 includes a concentrically distributed low-voltage winding 21, a cooling air duct 22 and a high-voltage winding 23, a pad 24 is arranged at the bottom of the high-voltage winding 23, an upper clamp 3 and a lower clamp 4 are arranged above and below the iron core 1, respectively, a bottom groove 5 is arranged below the lower clamp 4, and a caster 6 is arranged inside the bottom groove 5. Among them, a lifting lug is arranged on the top of the upper clamp 3, and the epoxy resin casting line is also provided with a low-voltage lead-out copper bar and a high-voltage connection plate, and the iron core 1, the epoxy resin casting coil 2, the pad 24, the upper clamp 3, the lower clamp 4, the bottom groove 5 and the caster 6 are existing mature technologies, and this embodiment will not be repeated here.

[0030] In order to improve the heat dissipation and cooling performance of the dry-type transformer, the top of the bottom slot 5 provided by the present invention is provided with two groups of fan groups 7 distributed on the front and rear sides of the iron core 1, and the fan group 7 includes three fans 71 distributed in a herringbone shape, wherein the axial directions of two fans 71 are located on the same axis, and the axial direction of another fan 71 is perpendicular to the axial directions of the other two fans 71, and the lower half of the cooling air duct 22 is provided with connecting ribs 25 distributed in a circular array, and the upper half of the cooling air duct 22 is provided with four ceramic bushings 8 surrounded in a ring structure, and the top of the ceramic bushing 8 is provided with a plurality of air outlet holes 8 1. A pair of connecting columns 82 are arranged at both ends of the top of the ceramic bushing 8 and close to the position of the adjacent ceramic bushing 8. Nuts 83 are arranged on the connecting columns 82. A ceramic cover 9 is arranged on the outer side of the top of the epoxy resin cast coil 2. The ceramic cover 9 includes an annular cover body section 91. A pair of skeleton sections 92 matched with the connecting columns 82 are arranged on the top of the cover body section 91. The skeleton sections 92 are provided with connecting holes. The skeleton sections 92 can establish a heat conduction path for the ceramic cover 9 and the ceramic bushing 8, and the actual installation position of the skeleton sections 92 just avoids the pad 24 on the epoxy resin cast coil 2.

[0031] Specifically, the cooling air duct 22 of the epoxy resin cast coil 2 provided by the present invention is connected to the atmosphere in the switch cabinet where the dry-type transformer is located. The flow effect of the air around and inside the epoxy resin cast coil 2 can be improved by comprehensively designing the distribution position of the fan 71 in the fan group 7. Furthermore, the present invention uses a connecting rib 25 in the lower half of the epoxy resin cast coil 2 to ensure the stability of the interval between the high-voltage winding 23 and the low-voltage winding 21; a ceramic bushing 8 and a ceramic cover 9 are provided in the upper half of the epoxy resin cast coil 2, and the ceramic bushing 8 and the ceramic cover 9 are made of new ceramic materials, preferably silicon carbide, aluminum nitride and beryllium oxide, or a mixture of two or more materials. These new ceramic materials have high thermal conductivity, such as the thermal conductivity of silicon carbide can reach 100-400W / (m·K), the thermal conductivity of aluminum nitride is generally between 180-320W / (m·K), and the thermal conductivity of beryllium oxide is higher, which can reach 200-300W / (m·K). These ceramic materials have good heat dissipation performance, even better than some metal materials such as copper. The present invention adds a ceramic bushing 8 and a ceramic cover 9, which are in a solid-solid heat transfer form with the epoxy resin cast coil 2, and the solid-solid heat transfer efficiency is greater than the efficiency of direct heat exchange between the epoxy resin cast coil 2 and the air, and the ceramic cover 9 can lead part of the heat of the ceramic bushing 8 from the inside of the epoxy resin cast coil 2 to the outside of the epoxy resin cast coil 2, so that the contact with the airflow is more complete. In addition, the ceramic material itself has a good heat dissipation ability, which effectively improves the efficiency of heat exchange from the iron core 1 and the inside of the epoxy resin cast coil 2 to the outside, and while improving the heat dissipation and cooling performance of the transformer of the present invention, it is also beneficial to increase the capacity of the transformer.

[0032] The ceramic bushing 8 and ceramic cover 9 provided by the present invention convert a portion of the heat exchange volume between the air in the cooling air duct 22 and the epoxy resin cast coil 2 into solid-solid heat transfer. While improving the heat exchange, it can reduce the mechanical damage of the wind to the insulating material of the epoxy resin cast coil 2 to a certain extent, which is beneficial to extending the actual service life of the transformer insulation material.

[0033] like Figure 1-Figure 3As shown, the fan group 7 also includes three sections of air ducts 72 arranged in a straight line, and the surface of the air duct 72 is provided with a plurality of ventilation strip holes 73 distributed along the length direction thereof, wherein two fans 71 are arranged at the two ends of the three sections of the air duct 72, and another fan 71 is arranged in the middle of the air duct 72 located in the middle position, and a guide fin group 74 is arranged between adjacent air ducts 72, and the guide fin group 74 includes a plurality of guide fins 741 and an inner rib 742 for connecting the guide fins 741, and the gap formed by adjacent guide fins 741 faces the insulating gap formed by adjacent iron core columns. Among them, the wind introduced by the fan 71 through the continuous rotation of its blades can flow from the ventilation strip holes 73 to the vicinity of the epoxy resin casting coil 2, especially the surface of the epoxy resin casting coil 2 and the range where the cooling air duct 72 is located; the guide fin group 74 guides part of the wind force to the insulating interval range of the adjacent epoxy resin casting coil 2, thereby improving the adequacy of air coverage of the epoxy resin casting coil 2, which is conducive to improving the heat dissipation performance of the transformer.

[0034] Furthermore, if Figure 8 As shown, the guide fin 741 provided by the present invention is a square structure and a vent 743 is arranged in the middle thereof, and the vents 743 on adjacent guide fins 741 gradually become smaller toward the middle direction of the core 1. By rationally designing the gradual change effect of the vents 743, it is helpful to improve the efficiency of the airflow from the guide fin 741 into the interval of the adjacent epoxy resin casting coil 2. Since the air volume from the two-end fans 71 entering the air duct 72 in the middle section is reduced, the present invention adopts another fan 71 that is distributed in a triangular shape with the two fans 71, so that the flow rate of the airflow blown out from the air duct 72 in the middle section can be guaranteed, which is helpful to ensure the uniformity of the airflow distribution near the epoxy resin casting coil 2 and the heat exchange efficiency.

[0035] like Fig. 9 As shown, the ceramic bushing 8 includes three layers of concentrically distributed curved plates 84, the radial projection of the curved plates 84 is an inverted trapezoidal structure, and the curved plates 84 are provided with a plurality of uniformly distributed radial connection holes 85 near the bottom thereof, and the radial connection holes 85 are provided with ceramic reinforcing columns 86 connecting the three curved plates 84. By providing three layers of curved plates 84, it is possible to ensure that the ceramic bushing 8 has a large thermal contact area with the high-voltage winding 23 and the low-voltage winding 21, and provide sufficient gas outflow channels, which is conducive to the air carrying heat from the inner surface of the ceramic bushing 8 and being discharged from the air outlet 81 at the top. The ceramic reinforcing columns 86 are conducive to improving the structural strength of the three curved plates 84 in the cooling air duct 22, and the airflow from bottom to top can flow upward through the cut surface of the ceramic reinforcing columns 86, so that the airflow discharged from the ceramic bushing 8 has better uniformity, which is conducive to improving the heat dissipation and cooling performance of the transformer.

[0036] Considering the characteristics of the insulation outer side of the high voltage winding 23, in order to match it, as Fig. 9 and Fig.10 As shown, the cover body section 91 provided by the present invention is provided with an inlay 93 that matches the outer protruding section of the high-voltage winding 23. The design of the inlay 93 can avoid the outer protruding section, and the thickness of the ceramic cover 9 itself can be effectively controlled, so that the ceramic cover 9 has a fast heat dissipation performance while reducing the unnecessary thickness of the ceramic cover 9.

[0037] According to the principle of hot air rising and the heat generation position of the dry-type transformer, the heat near the top of the epoxy resin casting coil 2 is relatively large. In order to reduce the frequency of hot air entering the inside of the epoxy resin casting coil 2, as shown in FIG. Figure 1-Figure 3 As shown, the present invention is provided with a pair of side guide plates 10 at both ends of the upper clamp 3, and the upper and lower ends of the side guide plates 10 are connected with the upper clamp 3 and the lower clamp 4 by bolts. The side guide plates 10 are provided with an upper guide port 101 and a lower guide port 102, and the upper guide port 101 is provided with a wind tube 103. The end of the wind tube 103 away from the iron core 1 is used to dock with the inner wall of the switch cabinet, and the wind tube 103 is provided with a plurality of heat dissipation fins 104 distributed in a circular array. The switch cabinet has heat dissipation holes on the inner wall corresponding to the wind tube 103, and the hot air near the epoxy resin cast coil 2 is accelerated along the surface of the heat dissipation fins 104 to pass through the heat dissipation holes, reducing the probability of hot air re-entering the heat dissipation cycle, which is conducive to increasing the proportion of fresh air inside the switch cabinet and the epoxy resin cast coil 2, thereby improving the heat dissipation efficiency of the transformer.

[0038] In order to improve the practicality of the air duct 103, the air duct 103 provided by the present invention includes a lip plate 1031 welded to the upper guide port 101, a lip opening is provided at the end of the lip plate 1031, and a cylinder 1032 nested with the lip opening is provided at one end of the lip plate away from the iron core 1. The cylinder 1032 and the lip plate 1031 are connected in a nested relationship, and the installation relationship is relatively flexible, which is convenient for fine-tuning the position of the cylinder 1032 according to the actual assembly situation, and is conducive to improving the efficiency of the airflow being discharged directly from the heat dissipation holes on the switch cabinet.

[0039] like Figure 1 As shown, a vertical opening 105 opposite to the epoxy resin casting coil 2 is provided in the middle of the side guide plate 10 provided by the present invention, and two side wings 106 distributed in an eight-shaped shape are provided on both sides of the vertical opening 105. The side wings 106 can be provided to promote the distribution of hot air to the front and rear of the switch cabinet, and heat dissipation holes are provided on the front and rear and sides of the switch cabinet, so that fresh air can enter the heat dissipation path from the location of the fan unit 7 with a relatively large proportion, which is conducive to improving the heat dissipation performance of the dry-type transformer.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A dry-type transformer for facilitating heat dissipation and cooling, comprising an iron core, the iron core comprising three iron core columns and an iron yoke for connecting the three iron core columns, an epoxy resin cast coil is arranged on the iron core column, the epoxy resin cast coil comprises a concentrically distributed low-voltage winding, a cooling air duct and a high-voltage winding, a pad is arranged at the bottom of the high-voltage winding, an upper clamp and a lower clamp are arranged above and below the iron core respectively, a bottom groove is arranged below the lower clamp, and casters are arranged inside the bottom groove, characterized in that: Two groups of fan units distributed on the front and rear sides of the iron core are arranged at the top of the bottom groove, and the fan unit includes three fans distributed in a herringbone shape, wherein the axial directions of two fans are located on the same axis, and the axial direction of the other fan is perpendicular to the axial directions of the other two fans, and the lower half of the cooling air duct is provided with connecting ribs distributed in a circular array, and the upper half of the cooling air duct is provided with four ceramic bushings surrounded in a ring structure, and the top of the ceramic bushing is provided with a plurality of air outlet holes, and a pair of connecting columns are provided at both ends of the top of the ceramic bushing and close to the position of the adjacent ceramic bushing, and nuts are provided on the connecting columns, and a ceramic cover is provided on the outer side of the top of the epoxy resin cast coil, and the ceramic cover includes an annular cover body section, and a pair of skeleton sections cooperating with the connecting columns are provided on the top of the cover body section, and the skeleton sections are provided with connecting holes.

2. A dry-type transformer that is easy to dissipate heat and cool according to claim 1, characterized in that: The fan group also includes three sections of air ducts arranged in a straight line, and the surface of the air duct is provided with a plurality of ventilation strip holes distributed along the length direction thereof, wherein two fans are arranged at the two ends of the three sections of the air duct, and the other fan is arranged in the middle of the air duct located in the middle position, and a guide fin group is arranged between adjacent air ducts, and the guide fin group includes a plurality of guide fins and inner ribs for connecting the guide fins, and the gap formed by adjacent guide fins faces the insulating gap formed by adjacent iron core columns.

3. A dry-type transformer that is easy to dissipate heat and cool according to claim 2, characterized in that: The guide fins are of a square structure and are provided with ventilation openings in the middle thereof. The ventilation openings on adjacent guide fins gradually become smaller toward the middle of the iron core.

4. A dry-type transformer that is easy to dissipate heat and cool according to claim 3, characterized in that: The ceramic bushing includes three layers of concentrically distributed curved plates, the radial projection of the curved plates presents an inverted trapezoidal structure, the curved plates are provided with a plurality of evenly distributed radial connecting holes near the bottom thereof, and the radial connecting holes are provided with ceramic reinforcing columns connecting the three curved plates.

5. A dry-type transformer that is easy to dissipate heat and cool according to claim 4, characterized in that: The cover body section is provided with an embedding notch matched with the outer protruding section of the high-voltage winding.

6. A dry-type transformer that is easy to dissipate heat and cool according to claim 1, characterized in that: A pair of side guide plates are provided at both ends of the upper clamp, the side guide plates are provided with an upper guide port and a lower guide port, the upper guide port is provided with a wind tube, the end of the wind tube away from the iron core is used to dock with the inner wall of the switch cabinet, and the interior of the wind tube is provided with a plurality of heat dissipation fins distributed in a circular array.

7. A dry-type transformer that is easy to dissipate heat and cool according to claim 6, characterized in that: The wind tube comprises a lip plate welded to the upper guide port, a lip opening is arranged at the end of the lip plate, and a cylinder body nested with the lip opening is arranged at one end of the lip plate away from the iron core.

8. A dry-type transformer that facilitates heat dissipation and cooling according to claim 7, characterized in that: A vertical opening opposite to the epoxy resin casting coil is arranged in the middle of the side guide plate, and two side wings distributed in an eight-shaped shape are arranged on both sides of the vertical opening.

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