Sealing arrangement for high voltage tapping assembly of dry-type transformer and dry-type transformer

Abstract

The application provides a sealing device for a high-voltage tapping assembly of a dry-type transformer and the dry-type transformer. The sealing device comprises a sealing cover for sealing the high-voltage tapping assembly from the external environment and a fastening device for fastening the sealing cover to a flat side surface of a coil. The sealing cover comprises a first cover body part having a first cavity for accommodating a first set of tapping joints, a second cover body part having a second cavity for accommodating a second set of tapping joints, and an intermediate connecting part connected between the first cover body part and the second cover body part. An internal part of the intermediate connecting part is formed with a through cable through-hole. One end of the cable through-hole is in communication with the first cavity, the other end of the cable through-hole is in communication with the second cavity, and the cable through-hole is sized to allow a tapping cable to pass therethrough. The sealing device has better sealing performance and improves the corrosion resistance of the high-voltage tapping assembly of the dry-type transformer.

Description

Technical Field

[0001] This application relates to transformer technology in power equipment. Specifically, this application relates to a sealing device for a high-voltage tap changer assembly of a dry-type transformer and a dry-type transformer. Background Technology

[0002] Currently, 35kV dry-type transformers are the most commonly used in offshore wind power generation. As wind turbine capacity increases, voltage levels are also rising; for example, 66kV offshore wind power dry-type transformers are a product that has only recently been proposed as a demand. Due to the increasing voltage of transformers and the unique high-salt spray and high-humidity environment at sea, higher sealing performance is required for the high-voltage tap changer components of the transformer's high-voltage coil.

[0003] Previously used 35kV dry-type or oil-immersed transformers had low voltage levels and no sealing cover at the high-voltage grading position, or used protective covers made of plexiglass. These protective covers were suitable for use on land and had a certain dust protection effect, but were not suitable for the high salt spray and high humidity and heat environment at sea. Summary of the Invention

[0004] This application aims to provide a sealing device for high-voltage tap changer assemblies of dry-type transformers to solve the problem of exposed tap joints (also known as tap elements or tap points, specifically tap nuts) in high-voltage transformers, improve the sealing performance of the transformer, and make the product more suitable for use in marine environments with high salt spray and high humidity. This application also aims to provide related dry-type transformers.

[0005] According to one aspect of this application, a sealing device is provided for a high-voltage tap changer assembly for a dry-type transformer, the dry-type transformer including a coil and a high-voltage tap changer assembly located on a flat side surface of the coil, the high-voltage tap changer assembly including a first set of tap joints and a second set of tap joints and a tap cable, the first set of tap joints including a plurality of first tap joints, the second set of tap joints including a plurality of second tap joints, the tap cable for connecting one of the first tap joints of the first set of tap joints to one of the second tap joints of the second set of tap joints, the sealing device including a sealing cover and a fastening device, the sealing cover for sealing the high-voltage tap changer assembly. The sealing device is used to secure the sealing cover to the flat side surface of the coil, and the sealing cover includes: a first cover portion having a first cavity for receiving the first component connector; a second cover portion having a second cavity for receiving the second component connector; and an intermediate connecting portion connecting the first cover portion and the second cover portion, wherein a through cable perforation is formed inside the intermediate connecting portion, one end of the cable perforation communicating with the first cavity and the other end of the cable perforation communicating with the second cavity, and the cable perforation is sized to allow the tap cable to pass through it.

[0006] In this way, the first and second enclosures, combined with the intermediate connecting part, can precisely seal the two sets of connectors and tap cables, effectively isolating them from high salt spray and high humidity environments, and significantly improving the reliability and lifespan of the dry-type transformer.

[0007] According to an exemplary embodiment of this application, the fastening device includes a first set of fastening bolts and a second set of fastening bolts, and a plurality of fastening nuts that cooperate with the first set of fastening bolts and the second set of fastening bolts and are fixed to the flat side surface of the coil. The sealing device further includes: a first pressure plate, which is used to cover the outer side of the first cover portion, and the first cover portion and the first pressure plate are fixed together to the flat side surface of the coil by the first set of fastening bolts; and a second pressure plate, which is used to cover the outer side of the second cover portion, and the second cover portion and the second pressure plate are fixed together to the flat side surface of the coil by the second set of fastening bolts.

[0008] In this way, a first pressure plate and a second pressure plate are added, which are reinforced by two sets of fastening bolts, making the sealing cover more evenly stressed and stronger in sealing performance.

[0009] According to an exemplary embodiment of this application, the middle region of the first pressure plate is a first hollow structure, the position of the first hollow structure corresponds to the position of the first cavity, and the area of ​​the first hollow structure is less than or equal to the area of ​​the first cavity; and the middle region of the second pressure plate is a second hollow structure, the position of the second hollow structure corresponds to the position of the second cavity, and the area of ​​the second hollow structure is less than or equal to the area of ​​the second cavity.

[0010] In this way, the first and second pressure plates are designed with hollow structures, reducing the overall weight of the sealing device while optimizing the contact pressure distribution.

[0011] According to an exemplary embodiment of this application, the first set of fastening bolts includes four first fastening bolts, the second set of fastening bolts includes four second fastening bolts, and the plurality of fastening nuts includes eight fastening nuts; the first cover portion includes a rectangular first closed cover plate and a first peripheral extension extending from the edge region of the first closed cover plate toward one side, the first closed cover plate and the first peripheral extension jointly defining the first cavity, wherein a first mounting through hole for the first fastening bolt is provided at each of the four corners of the first closed cover plate; the second cover portion includes a rectangular second closed cover plate and a second peripheral extension extending from the edge region of the second closed cover plate toward one side, the second closed cover plate and the second peripheral extension jointly defining the second cavity, wherein a second mounting through hole for the second fastening bolt is provided at each of the four corners of the second closed cover plate; and the first pressure plate has four first pressure plate mounting through holes for mounting the four first fastening bolts, and the second pressure plate has four second pressure plate mounting through holes for mounting the four second fastening bolts.

[0012] In this way, the four first fastening bolts and the four second fastening bolts are precisely matched with the sealing cover and pressure plate, resulting in more even stress distribution on the sealing cover, better sealing performance, and reduced maintenance work.

[0013] According to an exemplary embodiment of this application, the flat side surface of the coil defines a longitudinal direction and a transverse direction, the longitudinal direction extending parallel to the central axis of the coil and the transverse direction extending perpendicular to the central axis of the coil, wherein the intermediate connecting portion is connected to the first cover portion at the middle position in the transverse direction and to the second cover portion at the middle position in the transverse direction, and the extension dimension of the intermediate connecting portion in the longitudinal direction is greater than the extension dimension in the transverse direction.

[0014] In this way, the layout of the intermediate connection section is optimized, giving it a certain degree of flexibility in the longitudinal direction, making it more adaptable, reducing mechanical stress, and making it particularly suitable for the sealing requirements when the high-voltage tap changer of the transformer is distributed on two coils.

[0015] According to an exemplary embodiment of this application, the sealing cover is a one-piece component made of an elastomeric material, and the first pressure plate is a one-piece component made of a rigid plastic material, and the second pressure plate is a one-piece component made of a rigid plastic material.

[0016] In this way, the sealing cover uses an elastomer material, while the first and second pressure plates use rigid plastic materials. This not only ensures the elastic sealing effect of the sealing cover, but also improves the durability and environmental adaptability of the entire sealing device through the rigid support of the first and second pressure plates.

[0017] According to an exemplary embodiment of this application, the elastomer material is silicone rubber, and the rigid plastic material is PVC plastic.

[0018] In this way, by selecting appropriate materials for the sealing cover and the first and second pressure plates, the sealing device is ensured to have a certain degree of elasticity and durability, adapting to extreme marine conditions and ensuring the long-term stable operation of the transformer.

[0019] According to an exemplary embodiment of this application, the first set of fastening bolts, the second set of fastening bolts, and the fastening nut are all insulating components.

[0020] In this way, the use of insulation components avoids the risk of electrical short circuits, improves the safety of high-voltage tap changers, and complies with electrical specifications for special environments such as offshore wind power.

[0021] According to another aspect of this application, a dry-type transformer is provided, the dry-type transformer including a coil, a high-voltage tap assembly on a flat side surface of the coil, and a sealing device for the high-voltage tap assembly of the dry-type transformer according to any of the above embodiments.

[0022] In this way, the dry-type transformer uses a specially designed sealing device as described in the above embodiments, which improves the sealing performance of the transformer's high-voltage tap changer and enhances the dry-type transformer's ability to adapt to harsh environments, making it suitable for high-requirement projects such as offshore wind power.

[0023] According to an exemplary embodiment of this application, the coil includes a first coil and a second coil that are adjacent to each other, the first coil being located above the second coil, the first component connector being located on a flat side surface of the first coil, and the second component connector being located on a flat side surface of the second coil.

[0024] In this way, when the high-voltage coil consists of two coils, upper and lower, and it is difficult to combine the tapping surfaces of the upper and lower coils into a single plane, the specially designed sealing device in the above embodiment can be used to address this situation, and the sealing performance is also very good.

[0025] In general, the sealing device for the high-voltage tap changer assembly of the present invention avoids the problem of exposed high-voltage tap changer assemblies in high-voltage offshore wind power transformers, and can achieve many beneficial technical effects, especially the following:

[0026] First, the sealing cover material of the present invention can be silicone rubber, which has a certain elasticity, making the surface contact between the sealing cover and the coil tighter and improving the sealing performance.

[0027] Secondly, the present invention adds a first pressure plate and a second pressure plate, which makes the sealing cover more uniformly stressed and has a stronger sealing performance.

[0028] Third, the fastening bolts and nuts are made of insulating non-metallic parts, which improves the insulation performance of the sealing device.

[0029] Fourth, the sealing device of the present invention has higher sealing performance, improves the corrosion resistance of transformer tap nuts, and is more suitable for marine environments. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a schematic perspective view showing a sealing device for a high-voltage tap changer assembly of a dry-type transformer, according to an exemplary embodiment of this application, when applied to a single coil of the transformer.

[0032] Figure 2 This is a schematic perspective view showing a sealing device for a high-voltage tap changer assembly of a dry-type transformer, according to an exemplary embodiment of this application, applied to a single coil of the transformer. Figure 1 In comparison, the fastening bolts have been removed.

[0033] Figure 3 This is a schematic perspective view showing a sealing device for a high-voltage tap changer assembly of a dry-type transformer according to an exemplary embodiment of this application when applied to a single coil of the transformer, wherein components such as a sealing cover are omitted, and the position of the fastening nut is mainly shown.

[0034] Figure 4This is a schematic perspective view showing a sealing device for a high-voltage tap changer assembly of a dry-type transformer, according to an exemplary embodiment of this application, applied to two coils of the transformer.

[0035] Figure 5 This is a schematic front view showing a sealing device for a high-voltage tap changer assembly of a dry-type transformer, according to an exemplary embodiment of this application, when applied to two coils of the transformer.

[0036] Figure 6 This is a schematic cross-sectional view showing the sealing device of the high-voltage tap changer assembly for a dry-type transformer according to an exemplary embodiment of this application when applied to two coils of the transformer. Some parts have been omitted for clarity.

[0037] Figure 7 This is a schematic perspective view of a sealing cover of a sealing device for a high-voltage tap changer assembly of a dry-type transformer according to an exemplary embodiment of this application, showing one side of the sealing cover having a first cavity and a second cavity.

[0038] Figure 8 This is a schematic perspective view of a sealing cover of a sealing device for a high-voltage tap changer assembly of a dry-type transformer according to an exemplary embodiment of this application, showing the closed side of the sealing cover.

[0039] Figure 9 This is a schematic perspective view showing the pressure plate of a sealing device for a high-voltage tap changer assembly of a dry-type transformer according to an exemplary embodiment of this application.

[0040] Figure 10 This is a schematic perspective view of a sealing device for a high-voltage tap changer assembly of a dry-type transformer according to an exemplary embodiment of this application, wherein only half of the sealing device is cut off to clearly show its internal structure.

[0041] The accompanying figure is labeled as follows:

[0042] 10. Coil

[0043] 10', First coil

[0044] 10”, Second coil

[0045] 11. Flat side surface

[0046] 12. Tighten the nuts

[0047] 20. High-voltage tap changer assembly

[0048] 21. First set of connectors

[0049] 22. Second group of connectors

[0050] 23. Branch cable

[0051] 100. Sealing cover

[0052] 110. First Cover Section

[0053] 111. First cavity

[0054] 112. First bonding surface

[0055] 113. First peripheral extension

[0056] 114. First mounting through hole

[0057] 115. First sealing cover plate

[0058] 120. Second Cover Section

[0059] 121. Second cavity

[0060] 122. Second bonding surface

[0061] 123. Second peripheral extension

[0062] 124. Second mounting through hole

[0063] 125. Second sealing cover plate

[0064] 130. Intermediate connecting part

[0065] 131. Cable perforation

[0066] 200. Fastening device

[0067] 210. First set of fastening bolts

[0068] 220. Second set of fastening bolts

[0069] 310. First pressure plate

[0070] 311. First hollow structure

[0071] 312. First pressure plate mounting through hole

[0072] 320. Second pressure plate

[0073] X, lateral direction

[0074] Y, longitudinal direction Detailed Implementation

[0075] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application. The nouns and pronouns referring to persons in this patent application are not limited to specific genders.

[0076] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, regarding the drawings, directional terms such as "top," "bottom," "inner," "outer," "upper," and "lower" are used with reference to the direction of the described drawings.

[0077] According to embodiments of this application, a sealing device for a high-voltage tap changer assembly of a dry-type transformer and a dry-type transformer are provided. Figure 1 This is a schematic perspective view showing a sealing device for a high-voltage tap changer assembly of a dry-type transformer according to an exemplary embodiment of this application when applied to a single coil of the transformer, wherein the main components that the sealing device may include are shown: a sealing cover 100, a first pressure plate 310, a second pressure plate 320, and a fastening device 200.

[0078] For a better understanding of the solution in this application, please refer to... Figure 6 The diagram shows a schematic cross-sectional view of the sealing device applied to two coils of a transformer. For clarity, some parts have been removed, and the sealing cover 100 has been cut open, showing only half of the sealing cover 100 to reveal the high-voltage tap assembly 20 inside.

[0079] Reference Figure 6 You can refer to this at the same time. Figure 3 The dry-type transformer includes coil 10 ( Figure 3 (There are corresponding reference numerals in the accompanying drawings) and the high-voltage tap changer assembly 20 located on the flat side surface of the coil 10. Figure 6 (Clearly shown in the image). It should be noted that, in this application, "flat side surface" refers to a flat portion of the circumferential side surface of the coil. (As shown in the image). Figure 6 As shown, the high-voltage tap changer assembly 20 includes a first tap changer 21, a second tap changer 22, and a tap cable 23. The first tap changer 21 includes multiple first tap changers. Figure 3Specifically, it shows three first taps, and the second set of taps 22 includes multiple second taps. Figure 3 The diagram shows three second tap joints. The first tap joint is generally a tap nut, and the second tap joint is also generally a tap nut. Tap cable 23 is generally a copper cable.

[0080] Reference Figure 6 Tap cable 23 is used to connect one of the first taps in the first group of taps 21 to one of the second taps in the second group of taps 22. It is understood that the operator uses tap cable 23 to connect a selected first tap from the three first taps to a selected second tap from the three second taps, thereby obtaining the desired transformer voltage output. Therefore, by changing the first and second taps connected by tap cable 23, the voltage output of the transformer can be varied.

[0081] Return to reference Figure 1 The sealing cover 100 is used to seal the high voltage tap assembly 20 to isolate it from the external environment, and the fastening device 200 is used to fasten the sealing cover 100 to the flat side surface 11 of the coil 10.

[0082] Reference Figure 7 and Figure 8 The structure of the sealing cover 100 is shown more clearly. The sealing cover 100 may include: a first cover portion 110 having a first cavity 111 for receiving a first component connector 21; a second cover portion 120 having a second cavity 121 for receiving a second component connector 22; and an intermediate connecting portion 130 connecting the first cover portion 110 and the second cover portion 120. A through cable perforation 131 is formed inside the intermediate connecting portion 130. Figure 7 and Figure 10 (Clearly shown) One end of the cable perforation 131 communicates with the first cavity 111, and the other end of the cable perforation 131 communicates with the second cavity 121. The cable perforation is sized to allow the tap cable 23 to pass through it. It is explained here that the first housing portion 110 has an opening leading to the cable perforation 131 in the region where it connects with the intermediate connecting portion 130, and the second housing portion 120 also has an opening leading to the cable perforation 131 in the region where it connects with the intermediate connecting portion 130.

[0083] Reference Figure 7The first cover portion 110 has a first contact surface 112 surrounding the first cavity 111, such that when the sealing cover 100 is positioned on the coil 10, the first contact surface 112 contacts the flat side surface 11 of the coil 10; and the second cover portion 120 has a second contact surface 122 surrounding the second cavity 121, such that when the sealing cover 100 is positioned on the coil 10, the second contact surface 122 contacts the flat side surface 11 of the coil 10. The first contact surface 112 and the second contact surface 122 may be on the same plane.

[0084] Reference Figure 1 The fastening device 200 may include a first set of fastening bolts 210 and a second set of fastening bolts 220. The first set of fastening bolts 210 may include four first fastening bolts, and the second set of fastening bolts 220 may include four second fastening bolts, thus a total of eight fastening bolts. These eight fastening bolts are insulated bolts, specifically nylon insulated bolts. It should be noted that the flat side surface 11 of the coil 10 has eight fastening nuts 12 corresponding to the first set of fastening bolts 210 and the second set of fastening bolts 220, respectively. All fastening nuts 12 are fixed to the flat side surface 11 of the coil 10, for example, embedded in the flat side surface 11. Specifically, the flat side surface of the coil may be epoxy resin. By placing the fastening nuts at predetermined positions on the coil and casting them together, the fastening nuts 12 can be fixed to the flat side surface 11 of the coil. For this, refer to... Figure 3 For clarity, only one fastening nut, 12, is labeled; however, the other seven fastening nuts are actually located in... Figure 3 This is clearly shown in the text.

[0085] The first pressure plate 310 of the sealing device is used to cover the outer side of the first cover portion, the outer side of which refers to the side of the first cover portion opposite to the coil 10. The first cover portion 110 and the first pressure plate 310 are fixed together to the flat side surface 11 of the coil 10 by the engagement of a first set of fastening bolts 210 and corresponding fastening nuts. The second pressure plate 320 is used to cover the outer side of the second cover portion, the outer side of which refers to the side of the second cover portion opposite to the coil 10. The second cover portion 120 and the second pressure plate 320 are fixed together to the flat side surface 11 of the coil 10 by the engagement of a second set of fastening bolts 220 and corresponding fastening nuts.

[0086] Reference Figure 9The diagram illustrates the structure of the first pressure plate 310. The outer contour of the first pressure plate 310 may be generally rectangular, having four first pressure plate mounting through holes 312 for mounting four first fastening bolts. The four first pressure plate mounting through holes 312 are located at the four corners of the first pressure plate 310 and penetrate through it. The central region of the first pressure plate 310 is a first hollow structure 311, the position of which corresponds to the position of the first cavity 111, and the area of ​​the first hollow structure 311 is less than or equal to the area of ​​the first cavity 111. The outer contour of the first hollow structure 311 has an octagonal cross-section, including two top and bottom sides, two left and right side sides, and four inclined sides opposite to the four first pressure plate mounting through holes 312.

[0087] The second pressure plate 320 has the same structure as the first pressure plate 310. The outer contour of the second pressure plate 320 can be generally rectangular, and it has four second pressure plate mounting through holes for mounting four second fastening bolts. The four second pressure plate mounting through holes are located at the four corners of the second pressure plate 320 and penetrate through the second pressure plate 320. The middle area of ​​the second pressure plate 320 is a second hollow structure, the position of which corresponds to the position of the second cavity 121, and the area of ​​the second hollow structure is less than or equal to the area of ​​the second cavity 121.

[0088] Reference Figure 7 and Figure 8 The first cover portion 110 of the sealing cover 100 includes a generally rectangular first sealing cover plate 115 and a first peripheral extension portion 113 extending from the edge region of the first sealing cover plate 115 toward one side. The first sealing cover plate 115 and the first peripheral extension portion 113 together define a first cavity 111. Of course, the four corners of the first sealing cover plate 115 can be rounded. The opening of the first cover portion 110 leading to the cable through hole 131 can be formed in the region of the first peripheral extension portion 113. A first mounting through hole 114 for a first fastening bolt is provided at each of the four corners of the first sealing cover plate 115. The first mounting through hole 114 penetrates the first sealing cover plate 115 and the first peripheral extension portion 113. The outer contour of the first cavity 111 has an octagonal cross-section, including two top and bottom sides, two left and right sides, and four inclined sides opposite to the region of the first mounting through hole 114.

[0089] Reference Figure 7 and Figure 8Similar to the first cover portion 110, the second cover portion 120 includes a rectangular second enclosing cover plate 125 and a second peripheral extension portion 123 extending from the edge region of the second enclosing cover plate 125 toward one side. The second enclosing cover plate 125 and the second peripheral extension portion 123 together define the second cavity 121. Of course, the four corners of the second enclosing cover plate 125 can be rounded. The opening of the second cover portion 120 leading to the cable through hole 131 can be formed in the region of the second peripheral extension portion 123. A second mounting through hole 124 for a second fastening bolt is provided at each of the four corners of the second enclosing cover plate 125. The second mounting through hole 124 penetrates the second enclosing cover plate 125 and the second peripheral extension portion 123. The outer contour of the second cavity 121 has an octagonal cross-section, including two top and bottom sides, two left and right side sides, and four inclined sides opposite to the region of the second mounting through hole 124.

[0090] Return to reference Figure 1 For ease of explanation, the flat side surface 11 of coil 10 defines a longitudinal direction Y and a transverse direction X. The longitudinal direction Y extends parallel to the central axis of coil 10, and the transverse direction X extends perpendicular to the central axis of coil 10. Figure 1 As shown, the intermediate connecting portion 130 is connected at one end to the first cover portion 110 at a midpoint in the lateral direction X, specifically at the half-position, and at the other end to the second cover portion 120 at a midpoint in the lateral direction X, specifically at the half-position. (Refer to...) Figure 7 The extension dimension of the intermediate connecting portion 130 in the longitudinal direction Y can be greater than its extension dimension in the transverse direction X. This allows the intermediate connecting portion to have a certain degree of flexibility in the longitudinal direction, making it more adaptable and reducing mechanical stress. It is particularly suitable for the sealing requirements when the high-voltage tap changer assembly of the transformer is distributed on two coils. Measured in a direction perpendicular to the flat side surface 11 of the coil 10, the first cover portion 110, the second cover portion 120, and the intermediate connecting portion 130 have the same thickness.

[0091] The sealing cover 100 can be a one-piece component made of an elastomeric material, particularly silicone rubber, and can be manufactured, for example, by injection molding. The first pressure plate 310 can be a one-piece component made of a rigid plastic material, and the second pressure plate 320 can also be a one-piece component made of a rigid plastic material, such as PVC (polyvinyl chloride) or vinyl chloride. The first set of fastening bolts 210, the second set of fastening bolts 220, and the fastening nut 12 are all insulating components, not metallic components, which improves the insulation performance of the sealing device.

[0092] This application also provides a dry-type transformer, which includes a coil 10, a high-voltage tap assembly 20 on a flat side surface 11 of the coil 10, and a sealing device for the high-voltage tap assembly of the dry-type transformer as described above.

[0093] exist Figures 1 to 3 In one embodiment, the high-voltage tap changer 20 is located on the flat side surface of a single coil 10. In contrast, in... Figures 4 to 6 In another embodiment, the coil includes a first coil 10' and a second coil 10'" that are adjacent to each other. The first coil 10' is located above the second coil 10'". A first component connector 21 is located on the flat side surface of the first coil 10', and a second component connector 22 is located on the flat side surface of the second coil 10'". The flat side surface 11 of the first coil 10' and the flat side surface 11 of the second coil 10' can be substantially in the same plane.

[0094] The sealing device of this application is particularly suitable for applications in Figures 4 to 6 The first component connector 21 and the second component connector 22 shown are located in the case of two coils, because this situation requires a sealing device with better sealing effect, and the construction of this specially designed sealing device is very suitable for such situations with demanding sealing requirements.

[0095] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A sealing device for a high-voltage tap changer assembly of a dry-type transformer, the dry-type transformer comprising a coil (10) and a high-voltage tap changer assembly (20) located on a flat side surface (11) of the coil (10), the high-voltage tap changer assembly (20) comprising a first set of tap changers (21) and a second set of tap changers (22) and a tap cable (23), the first set of tap changers (21) comprising a plurality of first tap changers, the second set of tap changers (22) comprising a plurality of second tap changers, the tap cable (23) being used to connect one of the first tap changers of the first set of tap changers (21) to one of the second tap changers of the second set of tap changers (22), characterized in that: The sealing device includes a sealing cover (100) and a fastening device (200). The sealing cover (100) is used to seal the high-voltage tap assembly (20) to isolate it from the external environment. The fastening device is used to fasten the sealing cover (100) to the flat side surface (11) of the coil (10). The sealing cover (100) includes: The first cover portion (110) has a first cavity (111) for accommodating the first component connector (21). The second housing portion (120) has a second cavity (121) for accommodating the second component connector (22); and An intermediate connecting portion (130) is connected between the first cover portion (110) and the second cover portion (120). The interior of the intermediate connecting portion (130) forms a through cable hole (131). One end of the cable hole (131) communicates with the first cavity (111), and the other end of the cable hole (131) communicates with the second cavity (121). The cable hole is sized to allow the tap cable (23) to pass through it.

2. The sealing device for the high-voltage tap changer assembly of a dry-type transformer according to claim 1, characterized in that: The fastening device (200) includes a first set of fastening bolts (210) and a second set of fastening bolts (220), as well as a plurality of fastening nuts (12) fixed to the flat side surface (11) of the coil (10) and cooperating with the first set of fastening bolts (210) and the second set of fastening bolts (220). The sealing device further includes: A first pressure plate (310) is used to cover the outer side of the first cover portion, and the first cover portion (110) and the first pressure plate (310) are fixed together to the flat side surface (11) of the coil (10) by the first set of fastening bolts (210); and The second pressure plate (320) is used to cover the outside of the second cover portion, and the second cover portion (120) and the second pressure plate (320) are fixed together to the flat side surface (11) of the coil (10) by the second set of fastening bolts (220).

3. The sealing device for the high-voltage tap changer assembly of a dry-type transformer according to claim 2, characterized in that: The middle region of the first pressure plate (310) is a first hollow structure (311), the position of the first hollow structure (311) corresponds to the position of the first cavity (111), and the area of ​​the first hollow structure (311) is less than or equal to the area of ​​the first cavity (111); and The middle area of ​​the second pressure plate (320) is a second hollow structure. The position of the second hollow structure corresponds to the position of the second cavity (121), and the area of ​​the second hollow structure is less than or equal to the area of ​​the second cavity (121).

4. The sealing device for the high-voltage tap changer assembly of a dry-type transformer according to claim 2, characterized in that: The first set of fastening bolts (210) includes four first fastening bolts, the second set of fastening bolts (220) includes four second fastening bolts, and the plurality of fastening nuts (12) includes eight fastening nuts; The first cover portion (110) includes a rectangular first closed cover plate (115) and a first peripheral extension portion (113) extending from the edge region of the first closed cover plate (115) toward one side. The first cavity (111) is defined by the first closed cover plate (115) and the first peripheral extension portion (113). A first mounting through hole (114) for the first fastening bolt is provided at each of the four corners of the first closed cover plate (115). The second cover portion (120) includes a rectangular second closed cover plate (125) and a second peripheral extension portion (123) extending from the edge region of the second closed cover plate (125) toward one side. The second cavity (121) is defined by the second closed cover plate (125) and the second peripheral extension portion (123). A second mounting through hole (124) for the second fastening bolt is provided at each of the four corners of the second closed cover plate (125). Furthermore, the first pressure plate (310) has four first pressure plate mounting through holes (312) for mounting the four first fastening bolts, and the second pressure plate (320) has four second pressure plate mounting through holes for mounting the four second fastening bolts.

5. The sealing device for a high-voltage tap changer assembly of a dry-type transformer according to claim 1 or 2, characterized in that: The flat side surface (11) of the coil (10) defines a longitudinal direction (Y) and a transverse direction (X), the longitudinal direction (Y) extending parallel to the central axis of the coil (10), and the transverse direction (X) extending perpendicular to the central axis of the coil (10). The intermediate connecting portion (130) is connected to the first cover portion (110) at the middle position in the lateral direction (X) and to the second cover portion (120) at the middle position in the lateral direction (X). The extension dimension of the intermediate connecting portion (130) in the longitudinal direction (Y) is greater than the extension dimension in the lateral direction (X).

6. The sealing device for the high-voltage tap changer assembly of a dry-type transformer according to claim 2, characterized in that: The sealing cover (100) is a one-piece component made of an elastomeric material, and the first pressure plate (310) is a one-piece component made of a rigid plastic material, and the second pressure plate (320) is a one-piece component made of a rigid plastic material.

7. The sealing device for the high-voltage tap changer assembly of a dry-type transformer according to claim 6, characterized in that: The elastomer material is silicone rubber, and the rigid plastic material is PVC plastic.

8. The sealing device for the high-voltage tap changer assembly of a dry-type transformer according to claim 2, characterized in that: The first set of fastening bolts (210), the second set of fastening bolts (220), and the fastening nut (12) are all insulating parts.

9. A dry-type transformer, characterized in that: The dry-type transformer includes a coil (10), a high-voltage tap assembly (20) on the flat side surface (11) of the coil (10), and a sealing device for the high-voltage tap assembly for the dry-type transformer according to any one of claims 1 to 8.

10. The dry-type transformer according to claim 9, characterized in that: The coil (10) includes a first coil (10') and a second coil (10”) that are adjacent to each other. The first coil (10') is located above the second coil (10”). The first component connector (21) is located on the flat side surface of the first coil (10'), and the second component connector (22) is located on the flat side surface of the second coil (10”).

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