Antifouling compact dry-type transformer

Abstract

The antifouling compact dry-type transformer comprises a shell, a dry-type transformer body and a heat exchange system, a mounting cavity is formed in the shell, and the shell is provided with an air outlet channel communicating with the mounting cavity; the dry-type transformer body is arranged in the mounting cavity, an insulating shield is arranged outside a coil of the dry-type transformer body, an insulating partition plate is arranged between the shell wall of the shell and the dry-type transformer body, and a first labyrinth structure is arranged on the insulating partition plate; the heat exchange system is arranged on the shell and can drive air to sequentially flow through the first labyrinth structure, the coil in the insulating shield and the air outlet channel from the outside of the shell and then return to the outside of the shell. According to the antifouling compact dry-type transformer provided by the invention, external air can be extracted for heat exchange and cooling, and pollution of the external air to the internal working environment is reduced, so that normal work of the dry-type transformer can be ensured under the condition that the distance between the coils is not increased, and the dry-type transformer can be designed to be more compact.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dry-type transformers, in particular to a dirt-proof compact dry-type transformer. BACKGROUND

[0002] Dry-type transformers usually adopt strong air cooling mode of directly extracting external air, but in the case of fog, dust, rain and other adverse weather conditions, dust and water vapor from the outside are easy to enter the inside of the transformer shell along with the cooling air, and even adhere to the surface of the transformer coil and the surface of the insulator, causing pollution of the internal working environment, and further causing air ionization between the transformer coils, surface discharge on the coil surface, surface flashover on the insulator surface and other accidents. The conventional method is to appropriately increase the coil spacing to extend the insulation distance to ensure the normal operation of the transformer, but this will make the dry-type transformer bulky, which cannot meet the use requirements of the space-limited scene such as the nacelle of a wind turbine generator. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a dirt-proof compact dry-type transformer, which can extract external air for heat exchange cooling while reducing the pollution of external air to the internal working environment, so that the dry-type transformer can work normally without increasing the spacing between the coils, so that the dry-type transformer can be designed more compactly.

[0004] The dirt-proof compact dry-type transformer according to the embodiment of the present application comprises an outer shell, a dry-type transformer body and a heat exchange system, the outer shell is internally provided with a mounting cavity, and the outer shell is provided with an air outlet channel communicated with the mounting cavity; the dry-type transformer body is arranged in the mounting cavity, an insulating shield is arranged outside the coil of the dry-type transformer body, and an insulating partition plate is arranged between at least one side wall of the outer shell and the dry-type transformer body, and a first labyrinth structure is arranged on the insulating partition plate; the heat exchange system is arranged in the outer shell, and the heat exchange system can drive air to flow from the outside of the outer shell to the coil in the insulating shield and then to the air outlet channel, and then back to the outside of the outer shell.

[0005] The anti-pollution compact dry-type transformer according to the embodiment of the present application has at least the following beneficial effects: the dry-type transformer provided by the present application can use the heat exchange system to extract ambient air for heat exchange cooling, wherein the ambient air flows through the first labyrinth structure and then flows through the coils inside the insulating shield, so that the first labyrinth structure can be used to reduce the impurity content in the air, such as dust and moisture, and the insulating partition plate and the insulating shield can be used to avoid the impurities carried by the ambient air from being directly blown to the coils, and the insulating shield can be used to increase the insulation performance between the coils, thereby realizing the anti-pollution effect, reducing the pollution of the ambient air to the internal working environment, and ensuring the normal operation of the dry-type transformer without increasing the spacing between the coils, so that the dry-type transformer can be designed more compactly.

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

[0007] According to some embodiments of the present application, a conductive connecting rod is connected between two adjacent coils of the dry-type transformer body, an insulating sleeve is sleeved on the connecting position of the conductive connecting rod and the coil, and the outer wall of the insulating sleeve is provided with a petticoat structure.

[0008] According to some embodiments of the present application, a wind deflector is transversely arranged on the mounting cavity, the wind deflector is close to the upper end of the shell, the wind deflector divides the mounting cavity into an upper cavity and a lower cavity, the dry-type transformer body and the insulating shield are arranged in the wind deflector, the upper cavity and the lower cavity are communicated through the internal space of the insulating shield, the air outlet channel is communicated with the upper cavity, a communication flow channel is formed between the insulating partition plate and the shell, the first labyrinth structure is arranged in the communication flow channel, the upper end of the insulating partition plate is provided with an air outlet, the communication flow channel is communicated with the lower cavity through the air outlet, and the lower end of the shell is provided with an air inlet communicated with the communication flow channel.

[0009] According to some embodiments of the present application, the first labyrinth structure comprises a plurality of first guide structures arranged on the insulating partition plate, and two adjacent rows of the first guide structures are arranged at intervals to form a first flow channel, each row of the first guide structures comprises a plurality of first guide ribs arranged at intervals along a straight line, the first guide structure has a first communication port between two adjacent first guide ribs, and the first communication ports of two adjacent rows of the first guide structures are staggered.

[0010] According to some embodiments of the present application, the first guide structures are arranged obliquely relative to the up-down direction, so that the first flow channel is inclined.

[0011] According to some embodiments of the present application, the outer wall of the insulating shield is circumferentially provided with a second labyrinth structure.

[0012] According to some embodiments of the present application, the second labyrinth structure comprises a plurality of rows of second guide structures, two adjacent rows of the first guide structures are spaced apart to form a second flow channel, the second guide structure comprises a plurality of second guide ribs spirally arranged along the circumference of the insulation shield, two adjacent second guide ribs of the second guide structure have a second communication port therebetween, and the second communication ports of two adjacent rows of the second guide structure are staggered with each other.

[0013] According to some embodiments of the present application, the heat exchange system comprises a first fan arranged at the air outlet channel.

[0014] According to some embodiments of the present application, the coil and the insulation shield are axially along the up-down direction, and the heat exchange system comprises a second fan arranged above or below the insulation shield, the second fan is used for air extraction or air supply to the insulation shield.

[0015] Additional aspects and advantages of the present application will be given, partially in the following description, partially become obvious from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which: Figure 1 An internal schematic view of the anti-fouling compact dry-type transformer according to an embodiment of the present application; Figure 2 An internal schematic view of the anti-fouling compact dry-type transformer according to an embodiment of the present application; Figure 1 A top view of the dry-type transformer body of the anti-fouling compact dry-type transformer shown in FIG. 1; Figure 3 An internal schematic view of the anti-fouling compact dry-type transformer according to an embodiment of the present application; Figure 1 A partial schematic view of the first labyrinth structure of the insulation partition shown in FIG. 1.

[0017] Reference Signs: Housing 100, detachable shell plate 100a, mounting cavity 110, upper cavity 111, lower cavity 112, air outlet channel 120, air inlet 130, communication flow channel 140, dry-type transformer body 200, coil 210, insulation shield 220, conductive connecting rod 230, insulation sleeve 240, umbrella skirt structure 241, tapping terminal 250, insulation sheath 251, first fan 310, second fan 320, insulation partition 400, first guide structure 410, first guide rib 410a, first flow channel 411, first communication port 412, air outlet 420, baffle 500. DETAILED DESCRIPTION

[0018] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0019] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0020] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0021] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0022] Referring to Figures 1 to 3 , the anti-fouling compact dry-type transformer according to the embodiments of the present application comprises a shell 100, a dry-type transformer body 200 and a heat exchange system, the shell 100 is internally provided with a mounting cavity 110, and the shell 100 is provided with an air outlet channel 120 in communication with the mounting cavity 110; the dry-type transformer body 200 is arranged in the mounting cavity 110, and the coil 210 of the dry-type transformer body 200 is externally provided with an insulating shield 220, and an insulating partition plate 400 is arranged between at least one side wall of the shell 100 and the dry-type transformer body 200, and the insulating partition plate 400 is provided with a first labyrinth structure; the heat exchange system is arranged in the shell 100, and the heat exchange system can drive air to flow from the outside of the shell 100, sequentially pass through the first labyrinth structure, the coil 210 in the insulating shield 220 and the air outlet channel 120, and then return to the outside of the shell 100.

[0023] The dry-type transformer provided by the application can utilize the heat exchange system to extract external air for heat exchange cooling, wherein the external air flows through the first labyrinth structure and then flows through the coils 210 inside the insulating shield 220, so that the first labyrinth structure can be utilized to reduce the impurity content such as dust and moisture in the air, the insulating partition plate 400 and the insulating shield 220 can be utilized to avoid that the impurities carried by the external air directly blow to the coils 210, and the insulating shield 220 can be utilized to increase the insulation performance between the coils 210, thereby realizing the anti-pollution effect, reducing the pollution of the external air to the internal working environment, and ensuring the normal working of the dry-type transformer without increasing the distance between the coils 210, so that the dry-type transformer can be designed more compactly, and the use requirement of the wind turbine generator set cabin and other space-limited scenes can be met.

[0024] The setting of the first labyrinth structure can make the creepage distance on the insulating partition plate 400 longer, and avoid surface discharge, flashover and other conditions of the insulating partition plate 400.

[0025] According to some embodiments of the application, the surface of the insulating partition plate 400, in particular the surface of the first labyrinth structure, is provided with a hydrophobic anti-pollution flashover coating, and the surface of the insulating shield 220 is provided with a hydrophobic anti-pollution flashover coating. By coating the hydrophobic anti-pollution flashover coating, the moisture resistance and pressure resistance of the insulating partition plate 400 and the insulating shield 220 are enhanced, and the condition that the surface of the insulating partition plate 400, the insulating shield 220 and other insulators occurs flashover to cause a power system pollution flashover accident is avoided.

[0026] In the specific implementation process, the material of the hydrophobic anti-pollution flashover coating can adopt at least one implementation manner, for example, the hydrophobic anti-pollution flashover coating can be an organic high polymer material with extremely low surface energy and outstanding hydrophobic anti-pollution property, such as fluorocarbon compound and siloxane, and the hydrophobic anti-pollution flashover coating can also be a modified material such as a nano-particle modified organic base material.

[0027] In the specific implementation process, the two adjacent coils 210 of the dry-type transformer body 200 are usually connected with a conductive connecting rod 230. In order to ensure the connection performance between the conductive connecting rod 230 and the coils 210 and increase the creepage distance, the conductive connecting rod 230 is sleeved with an insulating sleeve 240 at the connecting position with the coils 210, and the outer wall of the insulating sleeve 240 is provided with a petticoat structure 241.

[0028] The actual operation shows that the dry-type transformer provided by the application can effectively cope with the complex environment of high humidity and much dust, and no surface flashover or coil 210 breakdown occurs in thunderstorm weather, thereby significantly improving the operation reliability and safety of the dry-type transformer.

[0029] Reference Figure 1According to some embodiments of the present application, the mounting cavity 110 is transversely provided with a baffle 500, the baffle 500 is close to the upper end of the shell 100, and the 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 insulation shield 220 are arranged in the baffle 500, wherein the upper cavity 111 and the lower cavity 112 are communicated through the internal space of the insulation shield 220, the air outlet channel 120 is communicated with the upper cavity 111, the communication flow channel 140 is formed between the insulation partition plate 400 and the shell 100, the first labyrinth structure is arranged in the communication flow channel 140, the insulation partition plate 400 is provided with an air outlet 420 at the upper end, the communication flow channel 140 is communicated with the lower cavity 112 through the air outlet 420, and the shell 100 is provided with an air inlet 130 at the lower end, which is communicated with the communication flow channel 140. Referring to Figure 1 The air outside the shell 100 flows from bottom to top through the communication flow channel 140, and then enters the lower cavity 112 from the air outlet 420. In the lower cavity 112, the air first flows from top to bottom outside the insulation shield 220, and then flows from bottom to top into the inside of the insulation shield 220 to contact and exchange heat with the coil 210. Then the air flows to the upper cavity 111, and finally leaves the shell 100 from the air outlet channel 120. With the above arrangement, without increasing the horizontal size of the shell 100, the flow path and the degree of tortuosity of the air before contacting the coil 210 are increased, so that the space of the communication channel and the outside of the insulation shield 220 can be more fully utilized to settle dust and condensed water vapor in the air, and the insulation partition plate 400, the first labyrinth structure thereon, and the outer wall of the insulation shield 220 can be used to adhere dust and water vapor, thereby more effectively reducing the content of dust and water vapor in the air when contacting the coil 210.

[0030] Referring to Figure 3 According to some embodiments of the present application, the first labyrinth structure includes a plurality of rows of first guide structures 410 arranged on the insulation partition plate 400, and adjacent two rows of first guide structures 410 are arranged at intervals to form first flow channels 411. Each row of first guide structures 410 includes a plurality of first guide ribs 410a arranged at intervals along a straight line, and the first guide structure 410 has a first communication port 412 between adjacent two first guide ribs 410a. The first communication ports 412 of adjacent two rows of first guide structures 410 are staggered with each other, so that all the first guide ribs 410a cooperate to form a labyrinth on the insulation partition plate 400. Since the first labyrinth structure is arranged in the communication flow channel 140, the communication flow channel 140 becomes a labyrinth flow channel.

[0031] Referring to Figure 3According to some embodiments of the present application, the first guide structures 410 are all arranged obliquely relative to the up-down direction, so as to incline the first flow channels 411. Thus, when the air flows through the first labyrinth structure, the water condensed in the air can flow down along the first flow channels 411 under the action of gravity after falling on the side walls (i.e., the first guide ribs 410a) of the first flow channels 411, and thus the labyrinth channel can more easily discharge the water from the air outlet 420 of the labyrinth channel, and the dust and the like accumulated on the side walls of the first flow channels 411 can also be easily discharged together with the water.

[0032] In other embodiments, the first labyrinth structure described above can also be arranged in other manners, for example, the first guide ribs 410a described above in the form of strips can be replaced by L-shaped protrusions.

[0033] With reference to Figure 1 In some embodiments, one side wall of the shell 100 is a detachable shell plate 100a, which is detachable by means of bolts, buckles or the like. The insulating partition plate 400 is opposite to the detachable shell plate 100a, and is detachably mounted on the dry-type transformer body 200 or mounted on the detachable shell plate 100a. The communication flow channel 140 is between the insulating partition plate 400 and the detachable shell plate 100a. With the above arrangement, the insulating partition plate 400 can be disassembled for cleaning the first labyrinth structure thereon in the later period, and the insulating partition plate 400 is convenient to disassemble.

[0034] According to some embodiments of the present application, the outer wall of the insulating shield 220 is circumferentially provided with a second labyrinth structure, so as to increase the contact area between the insulating shield 220 and the air, increase the ability of the insulating shield 220 to adsorb dust and moisture in the air, further reduce the content of dust and moisture in the air, and at the same time, increase the creepage distance of the outer wall of the insulating shield 220 and reduce the occurrence of flashover on the surface of the insulating shield 220.

[0035] According to some embodiments of the present application, the second labyrinth structure can be arranged in the same manner as the first labyrinth structure. Specifically, the second labyrinth structure includes a plurality of rows of second guide structures, and adjacent two rows of second guide structures are arranged at intervals to form second flow channels. The second guide structure includes a plurality of second guide ribs arranged spirally along the circumference of the insulating shield 220, and adjacent two second guide ribs of the second guide structure have a second communication port. The second communication ports of adjacent two rows of second guide structures are staggered with each other. Thus, the water droplets adsorbed on the outer wall of the insulating shield 220 can flow down along the second flow channels in the second labyrinth structure and finally be discharged from the insulating shield 220.

[0036] In the implementation process, the insulation shield 220 is annular, and the insulation shield 220 is formed by splicing at least two arc-shaped insulation pieces with elasticity, and the arc-shaped insulation pieces are curved from flat plate-shaped insulation pieces. In the production process, the second labyrinth structure is formed on the flat plate-shaped insulation pieces by stamping, injection molding, etc. Before the flat plate-shaped insulation pieces are curved into the arc-shaped insulation pieces, the plurality of second guide ribs of the second guide structure are arranged in a straight line, and after the flat plate-shaped insulation pieces are curved into the arc-shaped insulation pieces, the plurality of second guide ribs of the second guide structure are curved from the straight line to the spiral arrangement.

[0037] Referring to Figure 1 According to some embodiments of the present application, the heat exchange system comprises a first fan 310 arranged at the air outlet channel 120, so that the air in the installation cavity 110 can be extracted outside the shell 100 by the first fan 310.

[0038] Referring to Figure 1 According to some embodiments of the present application, the axial direction of the coil 210 and the insulation shield 220 is the up-down direction, and the heat exchange system comprises a second fan 320 arranged above or below the insulation shield 220, and the second fan 320 is used to extract or supply air to the insulation shield 220. Therefore, by the second fan 320, the flow rate of the air flowing through the coil 210 inside the insulation shield 220 is increased, and the heat dissipation efficiency of the coil 210 is improved.

[0039] Referring to Figure 1 According to some embodiments of the present application, the coil 210 has a plurality of tapping terminals 250, and an insulation sheath 251 is provided on the two tapping terminals 250 connected and combined together, so as to increase the insulation performance between the tapping terminal 250 and the conductive connecting rod 230, and to avoid the electrical breakdown phenomenon between the tapping terminal 250 and the conductive connecting rod 230. By connecting and combining the different two tapping terminals 250, the effective number of turns of the high-voltage winding can be changed, and the input voltage of the transformer is adjusted to adapt to the power grid fluctuation, so as to ensure that the output voltage is stable within the rated value range.

[0040] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as within the scope of the present application.

[0041] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A compact dry-type transformer with anti-pollution, characterized by, The application relates to a dry-type transformer, which comprises the following parts: an outer shell (100) internally provided with a mounting cavity (110), wherein the outer shell (100) is provided with an air outlet channel (120) communicating with the mounting cavity (110); a dry-type transformer body (200) arranged in the mounting cavity (110), wherein a coil (210) of the dry-type transformer body (200) is externally provided with an insulating shield (220), and an insulating partition plate (400) is arranged between at least one side wall of the outer shell (100) and the dry-type transformer body (200), and the insulating partition plate (400) is provided with a first labyrinth structure; a heat exchange system arranged in the outer shell (100), which can drive air to flow from outside the outer shell (100) to the first labyrinth structure, the coil (210) in the insulating shield (220) and the air outlet channel (120) in sequence and then return to the outside of the outer shell (100).

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

3. A compact dry-type transformer according to claim 1, wherein Conductive connecting rods (230) are connected between two adjacent coils (210) of the dry-type transformer body (200), and insulating sleeves (240) are arranged on the connecting positions of the conductive connecting rods (230) and the coils (210), and the outer wall of the insulating sleeve (240) is provided with an umbrella skirt structure (241).

4. The compact dry-type transformer of claim 1, wherein, A wind baffle (500) is arranged in the mounting cavity (110) in the transverse direction, the wind baffle (500) is close to the upper end of the outer shell (100), the mounting cavity (110) is divided into an upper cavity (111) and a lower cavity (112) by the wind baffle (500), the dry-type transformer body (200) and the insulating shield (220) pass through the wind baffle (500), the upper cavity (111) and the lower cavity (112) are communicated through the internal space of the insulating shield (220), the air outlet channel (120) is communicated with the upper cavity (111), a communication flow channel (140) is formed between the insulating partition plate (400) and the outer shell (100), the first labyrinth structure is arranged in the communication flow channel (140), an air outlet (420) is arranged at the upper end of the insulating partition plate (400), the communication flow channel (140) is communicated with the lower cavity (112) through the air outlet (420), and an air inlet (130) is arranged at the lower end of the outer shell (100) and communicated with the communication flow channel (140).

5. A compact dry-type transformer according to claim 1, wherein The first labyrinth structure comprises a plurality of rows of first guide structures (410) arranged on the insulating partition plate (400), and two adjacent rows of the first guide structures (410) are arranged at intervals to form a first flow channel (411), each row of the first guide structures (410) comprises a plurality of first guide ribs (410a) arranged at intervals along a straight line, and two adjacent first guide ribs (410a) of the first guide structure (410) have a first communication port (412) therebetween, and the first communication ports (412) of two adjacent rows of the first guide structures (410) are staggered with each other.

6. A compact dry-type transformer according to claim 5, characterized in that The first guide structure (410) is arranged obliquely relative to the up-down direction, so that the first flow channel (411) is oblique.

7. A compact dry-type transformer according to claim 1, wherein The outer wall of the insulating shield (220) is circumferentially provided with a second labyrinth structure.

8. A compact dry-type transformer according to claim 7, characterized in that The second labyrinth structure comprises a plurality of rows of second guide structures, two adjacent rows of the first guide structures (410) are arranged at intervals to form a second flow channel, the second guide structure comprises a plurality of second guide ribs arranged in a spiral along the circumference of the insulating shield (220), two adjacent second guide ribs of the second guide structure have a second communication port therebetween, and the second communication ports of two adjacent rows of the second guide structures are staggered with each other.

9. A compact dry-type transformer according to claim 1, wherein The heat exchange system comprises a first fan (310) arranged at the air outlet channel (120).

10. A compact dry-type transformer according to claim 5, wherein The coil (210) and the insulating shield (220) are axially along the up-down direction, and the heat exchange system comprises a second fan (320), the second fan (320) is arranged above or below the insulating shield (220), and the second fan (320) is used for air extraction or air supply to the insulating shield (220).

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