A dry-type transformer for high altitude

Abstract

This utility model discloses a high-altitude dry-type transformer, which includes a high-voltage winding and a low-voltage winding. Vertically arranged air ducts are provided within the high-voltage and low-voltage windings. The outer wall of the high-voltage winding has several equally spaced heat-conducting protrusions. Circumferentially distributed insulating pads are provided on the end faces between the high-voltage and low-voltage windings. The insulating pads have air-guiding grooves that allow air to pass through the air ducts, and arrayed air holes are provided on both sides of the air-guiding grooves. The heat-conducting protrusions increase the contact area between the high-voltage winding and the air, improving heat dissipation efficiency. Cold air enters the air-guiding channel through the air duct holes, and heat is conducted from the insulating pads to the heat-conducting plates. The first and second heat-conducting grooves expand the heat exchange area, suppressing excessive temperature rise. Reinforcing ribs enhance structural strength, preventing collapse due to insulation material aging, avoiding short circuits caused by winding indentation and deformation, enhancing support stability and overall reliability, and improving product safety and service life.

Description

Technical Field

[0001] This utility model relates to the field of dry-type transformer technology, and in particular to a dry-type transformer for high altitudes. Background Technology

[0002] High-altitude 35kV dry-type transformers are suitable for areas with thin air, large temperature differences, and complex geological conditions. Their design needs to take into account factors such as reduced heat dissipation efficiency, improved insulation strength, and enhanced seismic performance. They adopt modular structures and optimized cooling methods to ensure stable operation under natural or forced air cooling, while also possessing good environmental adaptability and safety. They are suitable for various complex working conditions and demanding power application scenarios.

[0003] Existing coil windings typically use insulating pads for axial support. However, in high-altitude areas, the reduced air density leads to decreased heat dissipation efficiency. The pads are constantly exposed to high temperatures, resulting in high temperature rise, accelerated aging of the insulation material, and a faster rate of mechanical strength degradation. Therefore, the applicant has developed a beneficial design and found a solution to the above problems. The technical solution described below arose from this context. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of traditional dry-type transformer designs and provide a product that offers stable support, prevents deformation, and enhances safety.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A high-altitude dry-type transformer includes a high-voltage winding and a low-voltage winding. Vertically arranged air ducts are provided within the high-voltage and low-voltage windings. The outer wall of the high-voltage winding has several equally spaced heat-conducting protrusions. Circumferentially distributed insulating pads are provided on the end faces between the high-voltage and low-voltage windings. The insulating pads have air guide grooves that allow passage for the air ducts. Arrayed air holes are provided on both sides of the air guide grooves. Several heat-conducting sheets are fixed within the air guide grooves located at the bottom of the high-voltage and low-voltage windings. Multiple reinforcing ribs are provided on the outer wall of the insulating pads.

[0007] Preferably, the insulating pad includes a first protrusion and a second protrusion, the first protrusion being embedded between the high-voltage winding and the low-voltage winding, and the second protrusion being fitted to the outer wall of the high-voltage winding.

[0008] Preferably, the air guide channel has a flared opening at its inlet, a fixing groove for fixing the heat-conducting sheet at its bottom, and the air guide channel above the low-voltage winding is configured as an open structure.

[0009] Preferably, one end of the heat-conducting sheet is provided with a limiting protrusion, which abuts tightly against the side wall of the fixing groove. The limiting protrusion is provided with an inclined surface facing the entrance of the fixing groove. The heat-conducting sheet is provided with pressing grooves on both sides. One end of the heat-conducting sheet is provided with a plurality of first heat-conducting grooves spaced apart, and the other end is provided with second heat-conducting grooves distributed in an alternating manner.

[0010] Preferably, the outer wall of the insulating pad is provided with a plurality of umbrella-shaped protrusions located above the air vents, and the end face of the insulating pad is provided with a connecting hole.

[0011] Preferably, the reinforcing ribs are disposed on both sides of the outer wall of the first protrusion and the second protrusion, and on the outer wall of the second protrusion. The reinforcing ribs are also disposed on the outer walls of both sides of the open-type air guide groove.

[0012] Beneficial effects:

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention enhances the contact area between the high-voltage winding surface and the air by using heat-conducting protrusions, thereby improving heat dissipation efficiency. When cold air enters from the air duct below the winding and then enters the air guide channel through the air holes, the temperature of the insulating pad itself is conducted to the heat-conducting sheet. The first and second heat-conducting grooves increase the heat exchange area with the cold air, thus suppressing excessive temperature rise of the insulating pad. By setting multiple reinforcing ribs, the overall structural strength of the insulating pad is effectively improved, preventing the mechanical strength from decreasing due to the aging of the insulation material, preventing the insulating pad from collapsing, preventing the high-voltage winding and low-voltage winding from sinking due to collapse, preventing short circuits caused by deformation, improving support stability and structural reliability, and enhancing the overall durability and safety of the product. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a dry-type transformer for high altitudes according to this utility model;

[0016] Figure 2 This is a side cross-sectional view of a dry-type transformer for high altitudes according to the present invention.

[0017] Figure 3 This utility model Figure 2 A magnified view (A) of a dry-type transformer used at high altitudes;

[0018] Figure 4 This utility model Figure 2 A magnified view (B) of a dry-type transformer used at high altitudes;

[0019] Figure 5 This is an exploded structural diagram of a dry-type transformer for high altitudes according to the present invention.

[0020] The correspondence between the labels and component names in the attached figures is as follows:

[0021] Reference numerals: 1. High-voltage winding; 2. Low-voltage winding; 3. Air duct; 4. Insulating pad; 5. Heat-conducting plate; 11. Heat-conducting protrusion; 41. Air guide groove; 42. Air hole; 43. Reinforcing rib; 44. First protrusion; 45. Second protrusion; 46. Umbrella-shaped boss; 47. Connecting hole; 411. Flared opening; 412. Fixing groove; 51. Limiting protrusion; 52. Inclined surface; 53. Pressing groove; 54. First heat-conducting groove; 55. Second heat-conducting groove. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Reference example Figures 1 to 5 A high-altitude dry-type transformer includes a high-voltage winding 1 and a low-voltage winding 2. Vertically arranged air ducts 3 are provided inside the high-voltage winding 1 and the low-voltage winding 2. The outer wall of the high-voltage winding 1 is provided with several equally spaced heat-conducting protrusions 11. The end face between the high-voltage winding 1 and the low-voltage winding 2 is provided with circumferentially distributed insulating pads 4. The insulating pads 4 are provided with air guide grooves 41 that give way to the air ducts 3. Air holes 42 are arranged in an array on both sides of the air guide grooves 41. Several heat-conducting sheets 5 are fixed in the air guide grooves 41 located at the bottom of the high-voltage winding 1 and the low-voltage sleeve. The outer wall of the insulating pads 4 is provided with multiple reinforcing ribs 43.

[0026] The heat-conducting protrusions 11 enhance the contact area between the surface of the high-voltage winding 1 and the air, thereby improving heat dissipation efficiency. When cold air enters from the air duct 3 below the winding and enters the air guide channel through the air hole 42, the temperature of the insulating pad 4 itself is conducted to the heat-conducting sheet 5. The first heat-conducting groove 54 and the second heat-conducting groove 55 increase the heat exchange area with the cold air, thereby suppressing the excessive temperature rise of the insulating pad 4. By setting multiple reinforcing ribs 43, the overall structural strength of the insulating pad 4 is effectively improved, avoiding the decrease in mechanical strength due to the aging of the insulation material, preventing the insulating pad 4 from collapsing, preventing the high-voltage winding 1 and the low-voltage winding 2 from sinking due to collapse, preventing short circuits caused by deformation, improving support stability and structural reliability, and enhancing the overall durability and safety of the product.

[0027] It is worth mentioning that the insulating pad 4 includes a first protrusion 44 and a second protrusion 45. The first protrusion 44 is embedded between the high voltage winding 1 and the low voltage winding 2, and the second protrusion 45 is attached to the outer wall of the high voltage winding 1. The second protrusion 45 keeps the high voltage winding 1 in a vertical position and prevents radial displacement caused by thermal expansion of the high and low voltage windings 2. The first protrusion 44 provides stable support for the second protrusion 45, enhances the structural reliability of the product during long-term use, and avoids deformation and poor contact caused by thermal stress.

[0028] It is worth mentioning that the air guide channel 41 has a flared section 411 at the inlet and a fixing groove 412 for fixing the heat-conducting plate 5 at the bottom. The air guide channel 41 located above the low-voltage winding 2 is set as an open structure. The flared section 411 at the bottom of the winding increases the gas flow rate of cold air entering the air duct 3, and the flared section 411 at the top of the winding increases the hot air exhaust speed. The open structure enhances the amount of external cold air entering the air guide channel and the hot air exhaust speed, improves heat exchange and heat dissipation efficiency, optimizes airflow organization, enhances heat dissipation performance, improves equipment operation stability, ensures effective heat transfer and exhaust, reduces the risk of local temperature rise, improves overall thermal management effect, and enhances structural adaptability and environmental adaptability.

[0029] It is worth mentioning that one end of the heat-conducting sheet 5 is provided with a limiting protrusion 51, which is in close contact with the side wall of the fixing groove 412. The limiting protrusion 51 is provided with an inclined surface 52 facing the entrance of the fixing groove 412. The heat-conducting sheet 5 is provided with a pressing groove 53 on both sides. One end of the heat-conducting sheet 5 is provided with a plurality of first heat-conducting grooves 54 at intervals, and the other end is provided with second heat-conducting grooves 55 arranged in an alternating manner. The limiting protrusion 51 allows the heat-conducting sheet 5 to be tightly connected to the fixing groove 412 through an interference fit. The inclined surface 52 facilitates the entry of the limiting protrusion 51 into the fixing groove 412. The tooling applies downward pressure through the pressing groove 53 to press the heat-conducting sheet 5 into the fixing groove 412. The first heat-conducting grooves 54 and the second heat-conducting grooves 55 increase the heat exchange area with cold air, improve heat dissipation efficiency, and improve the long-term support stability and reliability of the insulating pad 4.

[0030] It is worth mentioning that the outer wall of the insulating pad 4 is provided with several umbrella-shaped protrusions 46, which are located above the air vents 42, and the end face of the insulating pad 4 is provided with connecting holes 47.

[0031] It is worth mentioning that the reinforcing ribs 43 are provided on both sides of the outer wall of the first protrusion 44 and the second protrusion 45, as well as on the outer wall of the second protrusion 45. The reinforcing ribs 43 are also provided on the outer walls of both sides of the open air guide groove 41.

[0032] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A high-altitude dry-type transformer, comprising a high-voltage winding (1) and a low-voltage winding (2), wherein the high-voltage winding (1) and the low-voltage winding (2) are provided with vertically arranged air ducts (3), characterized in that: The outer wall of the high voltage winding (1) is provided with several equally spaced heat-conducting protrusions (11). The end face between the high voltage winding (1) and the low voltage winding (2) is provided with circumferentially distributed insulating pads (4). The insulating pads (4) are provided with air guide grooves (41) that allow air passages (3) to pass through. The air guide grooves (41) are provided with arrayed air holes (42) on both sides. Several heat-conducting plates (5) are fixed in the air guide grooves (41) at the bottom of the high voltage winding (1) and the low voltage sleeve. The outer wall of the insulating pads (4) is provided with multiple reinforcing ribs (43).

2. The high-altitude dry-type transformer according to claim 1, characterized in that: The insulating pad (4) includes a first protrusion (44) and a second protrusion (45). The first protrusion (44) is embedded between the high voltage winding (1) and the low voltage winding (2), and the second protrusion (45) is attached to the outer wall of the high voltage winding (1).

3. The high-altitude dry-type transformer according to claim 2, characterized in that: The air guide channel (41) has a flared opening (411) at its inlet and a fixing groove (412) for fixing the heat-conducting plate (5) at its bottom. The air guide channel (41) located above the low-voltage winding (2) is configured as an open structure.

4. The high-altitude dry-type transformer according to claim 1, characterized in that: One end of the heat-conducting sheet (5) is provided with a limiting protrusion (51) and closely abuts against the side wall of the fixing groove (412). The limiting protrusion (51) is provided with an inclined surface (52) facing the entrance of the fixing groove (412). The heat-conducting sheet (5) is provided with pressing grooves (53) on both sides. One end of the heat-conducting sheet (5) is provided with a plurality of first heat-conducting grooves (54) spaced apart, and the other end is provided with staggered second heat-conducting grooves (55).

5. The high-altitude dry-type transformer according to claim 1, characterized in that: The outer wall of the insulating pad (4) is provided with several umbrella-shaped protrusions (46) and located above the air hole (42). The end face of the insulating pad (4) is provided with a connecting hole (47).

6. The high-altitude dry-type transformer according to claim 3, characterized in that: The reinforcing ribs (43) are provided on both sides of the outer wall of the first protrusion (44) and the second protrusion (45), and on the outer wall of the second protrusion (45). The reinforcing ribs (43) are also provided on both sides of the outer wall of the open air guide groove (41).

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