Compact dry-type transformer with anti-pollution

Abstract

This invention discloses a pollution-resistant compact dry-type transformer, comprising a casing, a dry-type transformer body, and a heat exchange system. The casing has an internal mounting cavity and an air outlet channel communicating with the mounting cavity. The dry-type transformer body is housed within the mounting cavity, and its coils are protected by an insulating cover. An insulating partition is positioned between the casing wall and the dry-type transformer body, and the insulating partition has a first labyrinth structure. The heat exchange system is located within the casing and drives air to flow sequentially from the outside of the casing through the first labyrinth structure, the coils inside the insulating cover, and the air outlet channel before returning to the outside of the casing. The pollution-resistant compact dry-type transformer provided by this invention can draw in outside air for heat exchange and cooling while reducing the pollution of the internal working environment by outside air. This allows the dry-type transformer to operate normally without increasing the distance between the coils, enabling a more compact design.

Description

Technical Field

[0001] This invention relates to the field of dry-type transformer technology, and in particular to a pollution-resistant compact dry-type transformer. Background Technology

[0002] Dry-type transformers typically employ a strong air cooling method that directly draws in outside air. However, in harsh weather conditions such as fog, dust, and rain, external dust and moisture can easily enter the transformer casing with the cold air, even adhering to the surface of the transformer coils and insulators. This contaminates the internal working environment and can lead to accidents such as air ionization between transformer coils, surface discharge on coil surfaces, and flashover on insulator surfaces. The current conventional practice is to appropriately increase the coil spacing to extend the insulation distance and ensure normal transformer operation. However, this makes the dry-type transformer bulky and cannot meet the space-constrained requirements of applications such as wind turbine nacelles. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pollution-resistant compact dry-type transformer that can draw in outside air for heat exchange and cooling while reducing the pollution of the internal working environment by outside air. This ensures the normal operation of the dry-type transformer without increasing the spacing between coils, allowing for a more compact design.

[0004] According to an embodiment of the present invention, a pollution-resistant compact dry-type transformer includes a casing, a dry-type transformer body, and a heat exchange system. The casing has an internal mounting cavity and an air outlet channel communicating with the mounting cavity. The dry-type transformer body is disposed within the mounting cavity, and an insulating cover is provided around the coils of the dry-type transformer body. An insulating partition is provided between at least one side wall of the casing and the dry-type transformer body, and a first labyrinth structure is provided on the insulating partition. The heat exchange system is disposed within the casing and is capable of driving air from outside the casing sequentially through the first labyrinth structure, the coils inside the insulating cover, and the air outlet channel before returning to the outside of the casing.

[0005] The anti-pollution compact dry-type transformer according to embodiments of the present invention has at least the following beneficial effects: The dry-type transformer provided by the present invention can use a heat exchange system to draw in outside air for heat exchange and cooling. The outside air flows through the first labyrinth structure and then through the coils inside the insulating cover. Thus, the first labyrinth structure can reduce the content of impurities such as dust and water vapor in the air, and the insulating partition and insulating cover can prevent outside air carrying impurities from being directly blown onto the coils. At the same time, the insulating cover can increase the insulation performance between the coils. Thus, the anti-pollution effect is achieved, reducing the pollution of the internal working environment by outside air. Therefore, the normal operation of the dry-type transformer can be guaranteed without increasing the spacing between the coils, making the dry-type transformer more compact in design.

[0006] According to some embodiments of the present invention, the surface of the insulating partition is provided with a hydrophobic anti-flashover coating, and the surface of the insulating cover is provided with a hydrophobic anti-flashover coating.

[0007] According to some embodiments of the present invention, a conductive connecting rod is connected between two adjacent coils of the dry-type transformer body, and an insulating sleeve is provided at the connection point between the conductive connecting rod and the coil, and an umbrella skirt structure is provided on the outer wall of the insulating sleeve.

[0008] According to some embodiments of the present invention, a wind baffle is laterally arranged in the mounting cavity. The wind baffle is close to the upper end of the outer shell and divides the mounting cavity into an upper cavity and a lower cavity. The dry-type transformer body and the insulating cover pass through the wind baffle. The upper cavity and the lower cavity are connected through the internal space of the insulating cover. The air outlet channel is connected to the upper cavity. A connecting flow channel is formed between the insulating partition and the outer shell. The first labyrinth structure is located in the connecting flow channel. An air outlet is provided at the upper end of the insulating partition. The connecting flow channel is connected to the lower cavity through the air outlet. An air inlet communicating with the connecting flow channel is opened at the lower end of the outer shell.

[0009] According to some embodiments of the present invention, the first labyrinth structure includes multiple rows of first guide structures disposed on the insulating partition, with adjacent rows of the first guide structures spaced apart to form a first flow channel, each row of the first guide structures including multiple first guide ribs arranged at intervals along a straight line, and a first communication opening between two adjacent first guide ribs of the first guide structure, with the first communication openings of adjacent rows of the first guide structures being staggered.

[0010] According to some embodiments of the present invention, the first guide structure is inclined relative to the vertical direction so that the first flow channel is inclined.

[0011] According to some embodiments of the present invention, the outer wall of the insulating shield is provided with a second labyrinth structure in the circumferential direction.

[0012] According to some embodiments of the present invention, the second labyrinth structure includes multiple rows of second guide structures, with adjacent rows of second guide structures spaced apart to form a second flow channel. The second guide structure includes multiple second guide ribs arranged circumferentially spirally along the insulating cover. A second communication port is provided between two adjacent second guide ribs of the second guide structure, and the second communication ports of adjacent rows of second guide structures are staggered.

[0013] According to some embodiments of the present invention, the heat exchange system includes a first fan disposed at the air outlet duct.

[0014] According to some embodiments of the present invention, the axial direction of the coil and the insulating cover is along the vertical direction, and the heat exchange system includes a second fan, which is disposed above or below the insulating cover, and the second fan is used to exhaust or supply air to the insulating cover.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an internal schematic diagram of a pollution-resistant compact dry-type transformer according to an embodiment of the present invention; Figure 2 for Figure 1 A top view of the dry-type transformer body of the anti-pollution compact dry-type transformer is shown. Figure 3 for Figure 1 A partial schematic diagram of the first labyrinthine structure of the insulating partition of a pollution-resistant compact dry-type transformer is shown.

[0017] Figure label: The components include: outer shell 100, detachable shell plate 100a, mounting cavity 110, upper cavity 111, lower cavity 112, air outlet 120, air inlet 130, connecting flow channel 140, dry-type transformer body 200, coil 210, insulating cover 220, conductive connecting rod 230, insulating sleeve 240, umbrella skirt structure 241, tap terminal 250, insulating sleeve 251, first fan 310, second fan 320, insulating partition 400, first guide structure 410, first guide rib 410a, first flow channel 411, first connecting port 412, air outlet 420, and wind baffle 500. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0020] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1 to 3 According to an embodiment of the present invention, a pollution-resistant compact dry-type transformer includes a housing 100, a dry-type transformer body 200, and a heat exchange system. The housing 100 has an internal mounting cavity 110 and an air outlet channel 120 communicating with the mounting cavity 110. The dry-type transformer body 200 is disposed within the mounting cavity 110. An insulating cover 220 is provided outside the coil 210 of the dry-type transformer body 200. An insulating partition 400 is provided between at least one side wall of the housing 100 and the dry-type transformer body 200, and a first labyrinth structure is provided on the insulating partition 400. The heat exchange system is disposed within the housing 100 and is capable of driving air from outside the housing 100 sequentially through the first labyrinth structure, the coil 210 inside the insulating cover 220, and the air outlet channel 120 before returning to the outside of the housing 100.

[0023] The dry-type transformer provided by this invention can draw in outside air for heat exchange and cooling using a heat exchange system. The outside air flows through a first labyrinth structure and then through the coils 210 inside the insulating cover 220. Thus, the first labyrinth structure can reduce the content of impurities such as dust and moisture in the air, and the insulating partition 400 and the insulating cover 220 can prevent outside air carrying impurities from being directly blown onto the coils 210. The insulating cover 220 can also increase the insulation performance between the coils 210, thereby achieving a pollution prevention effect and reducing the pollution of the internal working environment by outside air. This allows the dry-type transformer to operate normally without increasing the distance between the coils 210, making the dry-type transformer more compact and meeting the usage requirements of space-constrained scenarios such as wind turbine nacelles.

[0024] The first labyrinth structure allows for a longer creepage distance on the insulating partition 400, preventing surface discharge and flashover on the insulating partition 400.

[0025] According to some embodiments of the present invention, the surface of the insulating partition 400, particularly the surface of the first labyrinth structure, is provided with a hydrophobic anti-flashover coating, and the surface of the insulating cover 220 is also provided with a hydrophobic anti-flashover coating. By applying the hydrophobic anti-flashover coating, the moisture resistance and withstand voltage of the insulating partition 400 and the insulating cover 220 are enhanced, preventing flashover from occurring on the inner wall of the insulating partition 400, the insulating cover 220, and other insulating surfaces, thus avoiding flashover accidents in the power system.

[0026] In the specific implementation process, the material of the hydrophobic anti-flashover coating can adopt at least one implementation method. For example, the hydrophobic anti-flashover coating can be an organic polymer material with extremely low surface energy and outstanding hydrophobic and anti-fouling properties, such as fluorocarbon compounds and siloxanes. The hydrophobic anti-flashover coating can also be a modified material such as nanoparticle-modified organic substrate.

[0027] In practical implementation, a conductive connecting rod 230 is usually connected between two adjacent coils 210 of the dry-type transformer body 200. In order to ensure the connection performance between the conductive connecting rod 230 and the coil 210 and to increase the creepage distance, an insulating sleeve 240 is provided at the connection between the conductive connecting rod 230 and the coil 210, and an umbrella skirt structure 241 is provided on the outer wall of the insulating sleeve 240.

[0028] Actual operation shows that the dry-type transformer provided by this invention can effectively cope with complex environments with high humidity and high dust. No surface flashover or coil breakdown occurred during thunderstorms, which significantly improves the operational reliability and safety of the dry-type transformer.

[0029] Reference Figure 1According to some embodiments of the present invention, a baffle plate 500 is laterally arranged in the mounting cavity 110. The baffle plate 500 is close to the upper end of the outer shell 100 and divides the mounting cavity 110 into an upper cavity 111 and a lower cavity 112. The dry-type transformer body 200 and the insulating cover 220 pass through the baffle plate 500. The upper cavity 111 and the lower cavity 112 are connected through the internal space of the insulating cover 220. The air outlet channel 120 is connected to the upper cavity 111. A connecting flow channel 140 is formed between the insulating partition 400 and the outer shell 100. A first labyrinth structure is located in the connecting flow channel 140. An air outlet 420 is provided at the upper end of the insulating partition 400. The connecting flow channel 140 is connected to the lower cavity 112 through the air outlet 420. An air inlet 130 connected to the connecting flow channel 140 is opened at the lower end of the outer shell 100. (Refer to...) Figure 1 As indicated by the middle arrow, air outside the outer casing 100 flows upward through the connecting channel 140, then enters the lower cavity 112 through the air outlet 420. In the lower cavity 112, the air first flows downward from the outside of the insulating cover 220, then upward into the interior of the insulating cover 220 to contact the coil 210 for heat exchange. The air then flows to the upper cavity 111 and finally exits the outer casing 100 through the air outlet channel 120. With this configuration, without increasing the horizontal dimensions of the outer casing 100, the airflow path and tortuousness before contacting the coil 210 are increased. This allows for more efficient use of the connecting channel and the space outside the insulating cover 220 to settle dust and condensed moisture in the air. Furthermore, the insulating partition 400 and its first labyrinthine structure, along with the outer wall of the insulating cover 220, adhere to dust and moisture, thereby more effectively reducing the dust and moisture content in the air when it comes into contact with the coil 210.

[0030] Reference Figure 3 According to some embodiments of the present invention, the first labyrinth structure includes multiple rows of first guide structures 410 disposed on the insulating partition 400. Adjacent rows of first guide structures 410 are spaced apart to form a first flow channel 411. Each row of first guide structures 410 includes multiple first guide ribs 410a arranged at intervals along a straight line. A first connecting port 412 is provided between two adjacent first guide ribs 410a of the first guide structure 410. The first connecting ports 412 of adjacent rows of first guide structures 410 are staggered. Thus, all the first guide ribs 410a cooperate with each other to form a labyrinth on the insulating partition 400. Since the first labyrinth structure is within the connecting flow channel 140, the connecting flow channel 140 becomes a labyrinth flow channel.

[0031] Reference Figure 3According to some embodiments of the present invention, the first guide structure 410 is inclined relative to the vertical direction so that the first flow channel 411 is inclined. Thus, when air flows through the first labyrinth structure, the water condensed in the air falls onto the side wall of the first flow channel 411 (i.e., the first guide rib 410a), and the water can flow downward along the first flow channel 411 under the action of gravity. As a result, the labyrinth channel can more easily discharge water from the air outlet 420 of the labyrinth channel, and dust and other particles accumulated on the side wall of the first flow channel 411 can also be easily discharged along with the water.

[0032] In other embodiments, the first labyrinth structure described above can also be configured in other ways. For example, the strip-shaped first guide rib 410a can be replaced with an L-shaped protrusion.

[0033] Reference Figure 1 In some embodiments, one side wall of the outer casing 100 is a detachable casing plate 100a. The detachable casing plate 100a is detachable by means of bolts, clips, etc. The insulating partition 400 is opposite to the detachable casing plate 100a and is detachably installed on the dry-type transformer body 200, or the insulating partition 400 is installed on the detachable casing plate 100a. The connecting channel 140 is between the insulating partition 400 and the detachable casing plate 100a. With the above arrangement, the insulating partition 400 can be disassembled and installed so that the first labyrinth structure on the insulating partition 400 can be cleaned later, and the insulating partition 400 is easy to disassemble and install.

[0034] According to some embodiments of the present invention, the outer wall of the insulating cover 220 is provided with a second labyrinth structure in the circumferential direction. This can increase the contact area between the insulating cover 220 and the air, increase the ability of the insulating cover 220 to adsorb dust and moisture in the air, further reduce the dust and moisture content in the air, and at the same time increase the creepage distance of the outer wall of the insulating cover 220, reducing the occurrence of flashover on the surface of the insulating cover 220.

[0035] According to some embodiments of the present invention, the arrangement of the second labyrinth structure can refer to the arrangement of the first labyrinth structure. Specifically, the second labyrinth structure includes multiple rows of second guide structures, with adjacent rows of second guide structures spaced apart to form a second flow channel. Each second guide structure includes multiple second guide ribs arranged circumferentially spirally along the insulating cover 220. A second connecting opening is provided between adjacent second guide ribs of the second guide structure, and the second connecting openings of adjacent rows of second guide structures are staggered. Thus, water droplets adsorbed on the outer wall of the insulating cover 220 can flow downwards along the second flow channel within the second labyrinth structure and eventually drain away from the insulating cover 220.

[0036] In the specific implementation process, the insulating cover 220 is annular and is formed by splicing at least two arc-shaped insulating parts with arc-shaped cross sections. The arc-shaped insulating parts have a certain elasticity and are formed by bending flat insulating parts. During the production and processing, the second labyrinth structure is formed on the flat insulating parts by stamping, injection molding and other methods. Before the flat insulating parts are bent, the multiple second guide ribs of each row of second guide structures are arranged in a straight line. After the flat insulating parts are bent into arc-shaped insulating parts, the multiple second guide ribs of the second guide structures are bent from a straight line arrangement into a spiral arrangement.

[0037] Reference Figure 1 According to some embodiments of the present invention, the heat exchange system includes a first fan 310 disposed at the air outlet duct 120, so that the air in the mounting cavity 110 can be drawn out to the outside of the housing 100 by the first fan 310.

[0038] Reference Figure 1 According to some embodiments of the present invention, the axial direction of the coil 210 and the insulating cover 220 is along the vertical direction. The heat exchange system includes a second fan 320, which is disposed above or below the insulating cover 220. The second fan 320 is used to draw air from or supply air to the insulating cover 220. Thus, the second fan 320 increases the airflow velocity when the air flows through the coil 210 inside the insulating cover 220, thereby improving the heat dissipation efficiency of the coil 210.

[0039] Reference Figure 1 According to some embodiments of the present invention, the coil 210 has multiple tap terminals 250. Two tap terminals 250 connected together are fitted with insulating sleeves 251 to increase the insulation performance between the tap terminals 250 and the conductive connecting rod 230, and to prevent electrical breakdown between the tap terminals 250 and the conductive connecting rod 230. By connecting different combinations of two tap terminals 250, the effective number of turns of the high-voltage winding can be changed, thereby adjusting the input voltage of the transformer to adapt to grid fluctuations and ensuring that the output voltage remains stable within the rated range.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A pollution-resistant, compact dry-type transformer, characterized in that, include: The outer casing (100) has an internal mounting cavity (110) and an air outlet channel (120) communicating with the mounting cavity (110). A dry-type transformer body (200) is disposed in the mounting cavity (110). An insulating cover (220) is provided outside the coil (210) of the dry-type transformer body (200). An insulating partition (400) is provided between at least one side of the outer shell (100) and the dry-type transformer body (200). A first labyrinth structure is provided on the insulating partition (400). A heat exchange system is provided in the outer shell (100), which can drive air from the outside of the outer shell (100) through the first labyrinth structure, the coil (210) inside the insulating cover (220) and the air outlet channel (120) and then back to the outside of the outer shell (100); A wind baffle (500) is laterally arranged in the mounting cavity (110). The wind baffle (500) is close to the upper end of the outer shell (100), and the wind baffle (500) divides the mounting cavity (110) into an upper cavity (111) and a lower cavity (112). The dry-type transformer body (200) and the insulating cover (220) pass through the wind baffle (500). The upper cavity (111) and the lower cavity (112) are connected through the internal space of the insulating cover (220). The air duct (120) is connected to the upper cavity (111), and a connecting flow channel (140) is formed between the insulating partition (400) and the outer shell (100). The first labyrinth structure is located in the connecting flow channel (140). An air outlet (420) is provided at the upper end of the insulating partition (400). The connecting flow channel (140) is connected to the lower cavity (112) through the air outlet (420). An air inlet (130) is provided at the lower end of the outer shell (100) and is connected to the connecting flow channel (140). The first labyrinth structure includes multiple rows of first guide structures (410) arranged on the insulating partition (400). Adjacent rows of first guide structures (410) are spaced apart to form a first flow channel (411). Each row of first guide structures (410) includes multiple first guide ribs (410a) arranged at intervals along a straight line. There is a first connecting port (412) between two adjacent first guide ribs (410a) of the first guide structure (410). The first connecting ports (412) of adjacent rows of first guide structures (410) are staggered.

2. A compact dry-type transformer according to claim 1, characterized in that The surface of the insulating partition (400) is provided with a hydrophobic anti-flashover coating, and the surface of the insulating cover (220) is provided with a hydrophobic anti-flashover coating.

3. The anti-pollution compact dry-type transformer according to claim 1, characterized in that, A conductive connecting rod (230) is connected between two adjacent coils (210) of the dry-type transformer body (200). An insulating sleeve (240) is provided at the connection between the conductive connecting rod (230) and the coil (210). An umbrella skirt structure (241) is provided on the outer wall of the insulating sleeve (240).

4. The anti-pollution compact dry-type transformer according to claim 1, characterized in that, The first guide structure (410) is inclined relative to the vertical direction so that the first flow channel (411) is inclined.

5. A pollution-resistant compact dry-type transformer according to claim 1, characterized in that, The outer wall of the insulating cover (220) is provided with a second labyrinth structure.

6. A pollution-resistant compact dry-type transformer according to claim 5, characterized in that, The second labyrinth structure includes multiple rows of second guide structures, with adjacent rows of second guide structures spaced apart to form a second flow channel. The second guide structure includes multiple second guide ribs arranged in a circumferential spiral along the insulating cover (220). There is a second communication port between two adjacent second guide ribs of the second guide structure, and the second communication ports of adjacent rows of second guide structures are staggered.

7. A pollution-resistant compact dry-type transformer according to claim 1, characterized in that, The heat exchange system includes a first fan (310) located at the air outlet duct (120).

8. A pollution-resistant compact dry-type transformer according to claim 1, characterized in that, The coil (210) and the insulating cover (220) are axially aligned in the vertical direction. The heat exchange system includes a second fan (320), which is positioned above or below the insulating cover (220). The second fan (320) is used to draw or blow air onto the insulating cover (220).

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