Anti-short-circuit structure of graphene copper-based high-conductivity distribution transformer and assembling method thereof

Abstract

The application belongs to the technical field of power distribution equipment, and particularly discloses an anti-short-circuit structure of a graphene copper-based high-conductivity power distribution transformer and an assembling method thereof. The wire of the coil winding is made of graphene high-conductivity copper material and has high conductivity. The two ends of the coil winding are respectively pressed against an iron yoke partition plate and a first pressing plate, so that the width area of the pressed end of the coil winding is increased, the structural strength of the coil winding is improved, the width deformation of the coil winding is reduced, and the ability of the transformer to resist sudden short-circuit impact is improved. The oil of the two adjacent coil windings can be circulated through the first oil guide groove arranged at the two ends of the coil winding. The oil of the two adjacent coil windings can also be circulated through the first oil guide groove and the second oil guide groove arranged at the two ends of the coil winding. The arrangement of the first oil guide groove and the second oil guide groove enables the oil to circulate inside the transformer, and the use reliability of the transformer is improved.

Description

Technical Field

[0001] This invention relates to the field of power distribution equipment technology, and in particular to a short-circuit protection structure and assembly method for a graphene copper-based high-conductivity power distribution transformer. Background Technology

[0002] Currently, the vast majority of conductor materials used in the power industry are traditional industrial conductive materials such as elemental copper. However, with further improvements in energy efficiency, the physical and chemical properties of traditional conductor materials can no longer be optimized through changes in design calculations. Therefore, the application of new conductor materials in power equipment is increasingly favored by mainstream power companies.

[0003] Graphene materials have garnered significant attention for enhancing the conductivity of traditional elemental conductors due to their excellent electrical conductivity and thermal stability. Consequently, most mainstream graphene-based high-conductivity materials on the market currently employ a mixture of exfoliated graphene layers and ground copper powder, followed by sintering and drawing to obtain a high-conductivity conductor. However, graphene-based high-conductivity materials are composite conductors, exhibiting inferior yield strength, tensile strength, and flexibility compared to conventional copper elemental conductors. While they can demonstrate excellent conductivity in transformer manufacturing, for distribution transformers, especially those requiring short-term overload conditions, the windings of graphene-based high-conductivity materials and the transformers constructed from them lack the capability to withstand sudden short circuits if a conventional transformer structure is used. Summary of the Invention

[0004] The purpose of this invention is to provide a short-circuit resistant structure and assembly method for a graphene copper-based high-conductivity distribution transformer, which has high conductivity and improves the transformer's ability to resist sudden short-circuit impacts and its reliability in use.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a short-circuit protection structure for a graphene-copper-based high-conductivity distribution transformer is provided, comprising:

[0007] Multiple coil windings, wherein the wires of the coil windings are made of graphene-based high-conductivity copper material;

[0008] A yoke partition is disposed at both ends of the coil winding and abuts against the end faces of two adjacent coil windings. The two opposite ends of the yoke partition in the first direction are arc-shaped and match the inner diameter of the coil winding. The side of the yoke partition facing the end face of the coil winding is provided with a plurality of first oil guide grooves at intervals along the second direction. Each first oil guide groove extends along the first direction and penetrates both end faces of the yoke partition.

[0009] The first pressure plate is provided at both ends of the iron yoke partition in the second direction. The first pressure plate abuts against the iron yoke partition and the end faces of two adjacent coil windings. The first pressure plate is provided with a plurality of second oil guide grooves at intervals along the first direction on the side facing the end face of the coil windings. Each second oil guide groove extends along the second direction and penetrates both end faces of the first pressure plate. The two outermost first oil guide grooves are respectively connected to the second oil guide grooves on the corresponding sides.

[0010] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, a pressure-resistant groove extending along a first direction is provided on one side of the first pressure plate. The pressure-resistant groove penetrates the end face of the first pressure plate on one side in a second direction. The end of the iron yoke partition is placed in the pressure-resistant groove, and the iron yoke partition abuts against the bottom of the pressure-resistant groove. The second oil guide groove is connected to the pressure-resistant groove.

[0011] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, the two outermost first oil guide grooves are provided with multiple openings on the sidewalls near the first pressure plate, and the openings are arranged one-to-one with the second oil guide grooves.

[0012] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, a phase spacer is provided between two adjacent coil windings. A plurality of third oil guide grooves are provided on the phase spacer along the second direction. Each third oil guide groove extends along the third direction. The third oil guide groove is provided in a one-to-one correspondence with the first oil guide groove, and the two ends of the third oil guide groove are respectively connected to the first oil guide groove.

[0013] As an optional technical solution for the short-circuit protection structure of the aforementioned graphene copper-based high-conductivity distribution transformer, the end faces of the two outermost coil windings are respectively pressed against a second pressure plate. The second pressure plate is arranged opposite to the iron yoke partition. The second pressure plate is an arc-shaped plate. The end of the second pressure plate opposite to the iron yoke partition is an arc shape that matches the inner diameter of the coil winding. The middle part of the side of the second pressure plate facing the end face of the coil winding is provided with a plurality of fourth oil guide grooves spaced apart along the second direction. Each of the fourth oil guide grooves extends along the first direction and penetrates both end faces of the second pressure plate. The two ends of the side of the second pressure plate facing the end face of the coil winding are respectively provided with a plurality of fifth oil guide grooves. The plurality of fifth oil guide grooves are spaced apart along the first direction. Each of the fifth oil guide grooves extends along the second direction and penetrates the end face of the second pressure plate.

[0014] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, a cylindrical epoxy sheet is provided on the inner side of the coil winding, and a plurality of epoxy support strips are provided between the epoxy sheet and the inner wall of the coil winding. The plurality of epoxy support strips are arranged circumferentially around the epoxy sheet, and each epoxy support strip extends in a third direction.

[0015] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, the surface where the epoxy support bar connects to the coil winding is coated with an adhesive layer made of heat-curing material.

[0016] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, the coil winding includes a low-voltage coil winding, which includes two first conductors. The first conductors are made of graphene high-conductivity copper material. The two first conductors are arranged in parallel and wound in a spiral manner. The two first conductors cross-interchange when wound to a preset position.

[0017] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, each of the first conductors is wrapped with a first multi-diamond grid adhesive paper.

[0018] And / or, the cross-sectional shape of the first conductor is rectangular.

[0019] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, the coil winding also includes a high-voltage coil winding, which includes a second conductor. The second conductor is made of graphene high-conductivity copper material and is wound in a layered manner. The cross-sectional shape of the second conductor is circular, and the outer side of the second conductor is wrapped with an insulating layer of epoxy acetal material.

[0020] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, the second conductor is wound in multiple layers to form the high-voltage coil winding. At least one second multi-diamond grid adhesive paper and at least one third multi-diamond grid adhesive paper are provided between the layers of the high-voltage coil winding. The length of the third multi-diamond grid adhesive paper in the third direction is less than the length of the second multi-diamond grid adhesive paper in the third direction. The third multi-diamond grid adhesive paper is disposed at the junction between the layers of the high-voltage coil winding.

[0021] As an optional technical solution for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer mentioned above, the coil winding includes a low-voltage coil winding and a high-voltage coil winding. The outer wall of the low-voltage coil winding is covered with a first insulating paperboard. The outer wall of the first insulating paperboard is provided with a plurality of paperboard support strips. The plurality of paperboard support strips are spaced apart along a third direction. Each paperboard support strip extends circumferentially along the low-voltage coil winding. The outer side of the plurality of paperboard support strips is wrapped with a second insulating paperboard. The high-voltage coil winding is sleeved on the outer side of the second insulating paperboard.

[0022] As an optional technical solution for the short-circuit protection structure of the aforementioned graphene copper-based high-conductivity distribution transformer, the outer side of the coil winding is covered with an epoxy glass ribbon layer.

[0023] Secondly, a method for assembling the short-circuit withstand structure of a graphene copper-based high-conductivity distribution transformer is provided, for assembling the aforementioned short-circuit withstand structure of the graphene copper-based high-conductivity distribution transformer, the assembly method comprising:

[0024] Fabricate coil windings;

[0025] Iron yoke partitions are installed at both ends of the coil windings, so that the iron yoke partitions press against the end faces of two adjacent coil windings, and the first oil guide groove is arranged facing the end face of the coil winding.

[0026] First pressure plates are installed at both ends of each of the iron yoke partitions, so that the first pressure plates abut against the end faces of the iron yoke partitions and the two adjacent coil windings, and the two outermost first oil guide grooves are respectively connected to the second oil guide grooves on the corresponding sides.

[0027] As an optional technical solution for assembling the short-circuit protection structure of the aforementioned graphene copper-based high-conductivity distribution transformer, the fabrication of the coil winding includes:

[0028] Multiple epoxy support strips are fixed to the outside of a cylindrical epoxy sheet, such that the multiple epoxy support strips are spaced apart circumferentially.

[0029] An adhesive layer made of heat-curing material is coated on the outer surface of the epoxy support strip;

[0030] A first conductor is wound in a spiral manner on the outside of the epoxy support bar to form a low-voltage coil winding;

[0031] The outer wall of the low-voltage coil winding is covered with a first insulating paperboard, and a plurality of paperboard support strips are fixed to the outer wall of the first insulating paperboard, such that the plurality of paperboard support strips are spaced apart along a third direction, and the outer side of the plurality of paperboard support strips is wrapped with a second insulating paperboard.

[0032] The second conductor is wound in a layered manner on the outside of the second insulating paperboard to form a high-voltage coil winding. During the winding process, at least one second multi-diamond grid adhesive paper and at least one third multi-diamond grid adhesive paper are placed between the layers of the high-voltage coil winding, and the third multi-diamond grid adhesive paper is placed at the junction between the layers of the high-voltage coil winding.

[0033] An epoxy glass ribbon is wound around the outside of the high-voltage coil winding to form an epoxy glass ribbon layer.

[0034] As an optional technical solution for assembling the short-circuit withstand structure of the aforementioned graphene-copper-based high-conductivity distribution transformer, the assembly method further includes:

[0035] A phase spacer is placed between two adjacent coil windings.

[0036] As an optional technical solution for assembling the short-circuit withstand structure of the aforementioned graphene-copper-based high-conductivity distribution transformer, the assembly method further includes:

[0037] A second pressure plate is provided on the end face of the two outermost coil windings, so that the second pressure plate is positioned opposite to the iron yoke partition.

[0038] The beneficial effects of this invention are:

[0039] The present invention provides a short-circuit resistant structure and assembly method for a graphene-copper-based high-conductivity distribution transformer. The coil winding conductors are made of graphene-copper high-conductivity material, exhibiting high conductivity. A yoke partition and a first pressure plate are respectively pressed against both ends of the coil winding, increasing the radial area of ​​the coil winding ends. The first pressure plate presses against the yoke partition, causing the yoke partition to press against the end face of the coil winding, thus improving the structural strength of the coil winding. When the coil winding is subjected to a sudden short-circuit impact, the radial deformation of the coil winding is reduced, improving the transformer's resistance to sudden short-circuit impacts. A first oil guide groove is provided on the yoke partition, allowing the oil in two adjacent coil windings to circulate through the first oil guide groove at both ends of the coil winding. A second oil guide groove is provided on the first pressure plate, with the two outermost first oil guide grooves respectively connected to the corresponding second oil guide grooves. The oil in two adjacent coil windings can also circulate through the first and second oil guide grooves at both ends of the coil winding. The arrangement of the first and second oil guide grooves enables the oil to circulate within the transformer, improving the transformer's reliability. Attached Figure Description

[0040] Figure 1 This is a first axial side schematic diagram of the internal structure of the graphene copper-based high-conductivity distribution transformer with short-circuit protection provided in an embodiment of the present invention;

[0041] Figure 2 This is a planar schematic diagram of the cooperation between the iron yoke partition and the first pressure plate provided in an embodiment of the present invention;

[0042] Figure 3 This is an axial side view of the cooperation between the iron yoke partition and the first pressure plate provided in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of the first pressure plate provided in an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the iron yoke partition provided in an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the structure of the second pressure plate provided in an embodiment of the present invention;

[0046] Figure 7 This is a second axial view of the internal structure of the graphene copper-based high-conductivity distribution transformer with short-circuit protection provided in an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the coil winding structure provided in an embodiment of the present invention;

[0048] Figure 9 This is a flowchart of the assembly method for the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer provided in the embodiments of the present invention.

[0049] In the picture:

[0050] 1. Coil winding; 2. Yoke partition; 3. First pressure plate; 4. Phase partition; 5. Second pressure plate; 6. Epoxy sheet; 7. Epoxy support bar;

[0051] 11. Low-voltage coil winding; 12. High-voltage coil winding; 13. First insulating paperboard; 14. Paperboard support strip; 15. Second insulating paperboard;

[0052] 21. First oil guide groove; 22. Opening; 23. Support bar;

[0053] 31. Second oil guide groove; 32. Pressure groove;

[0054] 41. Binding holes;

[0055] 51. Fourth oil guide groove; 52. Fifth oil guide groove. Detailed Implementation

[0056] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0057] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0060] Example 1

[0061] like Figure 1 and Figure 2As shown, this embodiment provides a short-circuit protection structure for a graphene-copper-based high-conductivity distribution transformer. This structure includes multiple coil windings 1, a yoke partition 2, and a first pressure plate 3. The conductors of the coil windings 1 are made of graphene-copper high-conductivity material. The yoke partition 2 is disposed at both ends of the coil windings 1 and presses against the end faces of two adjacent coil windings 1. The opposite ends of the yoke partition 2 in a first direction have an arc shape matching the inner diameter of the coil windings 1. Multiple first oil guide grooves 21 are spaced apart along a second direction on the side of the yoke partition 2 facing the end face of the coil windings 1. Each first oil guide groove 21 extends along the first direction and penetrates both end faces of the yoke partition 2. The iron yoke partition 2 is provided with first pressure plates 3 at opposite ends in the second direction. The first pressure plates 3 press against the end faces of the iron yoke partition 2 and two adjacent coil windings 1. The side of the first pressure plate 3 facing the end face of the coil winding 1 is provided with a plurality of second oil guide grooves 31 at intervals along the first direction. Each second oil guide groove 31 extends along the second direction and penetrates both end faces of the first pressure plate 3. The two outermost first oil guide grooves 21 are respectively connected to the corresponding second oil guide grooves 31.

[0062] The conductor of the coil winding 1 provided in this embodiment is made of graphene high-conductivity copper material, which has high conductivity. The two ends of the coil winding 1 are respectively pressed against an iron yoke partition 2 and a first pressure plate 3, increasing the radial area pressing against the ends of the coil winding 1. The first pressure plate 3 presses against the iron yoke partition 2, causing the iron yoke partition 2 to press against the end face of the coil winding 1, thus improving the structural strength of the coil winding 1. When the coil winding 1 is subjected to a sudden short-circuit impact, the radial deformation of the coil winding 1 is reduced, improving the transformer's resistance to sudden short-circuit impacts. The iron yoke partition 2 is provided with a first oil guide groove 21. The oil in two adjacent coil windings 1 can circulate through the first oil guide groove 21 set at both ends of the coil winding 1. The first pressure plate 3 is provided with a second oil guide groove 31. The two outermost first oil guide grooves 21 are respectively connected to the corresponding second oil guide grooves 31. The oil in two adjacent coil windings 1 can also circulate through the first oil guide groove 21 and the second oil guide groove 31 set at both ends of the coil winding 1. The setting of the first oil guide groove 21 and the second oil guide groove 31 realizes the circulation of oil inside the transformer, which improves the reliability of the transformer.

[0063] Optionally, the two outermost first oil guide grooves 21 are provided with multiple openings 22 on the sidewalls near the first pressure plate 3, and the openings 22 are provided one-to-one with the second oil guide grooves 31. The oil in the first oil guide groove 21 can flow into the corresponding second oil guide groove 31 through the openings 22 to realize the circulation of oil and improve the circulation efficiency of oil.

[0064] like Figures 3 to 5As shown, a second oil guide groove 31 is recessed on the first pressure plate 3. Multiple support bars 23 are provided on the side of the iron yoke partition 2 facing the end face of the coil winding 1. The first oil guide groove 21 is formed between two adjacent support bars 23. Openings 22 are provided on the two outermost support bars 23. Both the first pressure plate 3 and the iron yoke partition 2 are made of wood laminate.

[0065] In some embodiments, a pressing groove 32 extending in a first direction is provided on one side of the first pressure plate 3. The pressing groove 32 penetrates the end face of the first pressure plate 3 on one side in a second direction. The end of the yoke partition 2 is placed in the pressing groove 32, and the yoke partition 2 abuts against the bottom of the pressing groove 32. The second oil guide groove 31 communicates with the pressing groove 32. The pressing groove 32 on the first pressure plate 3 facilitates the first pressure plate 3 pressing against the yoke partition 2, so that the first pressure plate 3 and the yoke partition 2 form a whole, and firmly press the two ends of the yoke partition 2. Optionally, the first pressure plate 3 is a strip-shaped plate, and the outer edge of the first pressure plate 3 is approximately flush with the outer edge of the coil winding 1, which improves the compactness of the internal structure of the transformer.

[0066] See also Figure 1 As shown, both ends of the coil winding 1 are provided with iron yoke partition 2 and first pressure plate 3. The first pressure plate 3 is pressed on the iron yoke partition 2. The first pressure plates 3 at the upper and lower ends are connected by a connecting component so that the first pressure plate 3 and the iron yoke partition 2 press against both ends of the coil winding 1 and assemble the coil winding 1, the first pressure plate 3 and the iron yoke partition 2 together.

[0067] Combination Figure 1 and Figure 6 As shown, the end faces of the two outermost coil windings 1 are respectively pressed against second pressure plates 5. The second pressure plates 5 are arranged opposite to the iron yoke partition 2. The second pressure plates 5 are arc-shaped plates. The end of the second pressure plate 5 opposite to the iron yoke partition 2 has an arc shape that matches the inner diameter of the coil winding 1. The middle of the side of the second pressure plate 5 facing the end face of the coil winding 1 is provided with multiple fourth oil guide grooves 51 spaced apart along the second direction. Each fourth oil guide groove 51 extends along the first direction and penetrates both end faces of the second pressure plate 5. The two ends of the side of the second pressure plate 5 facing the end face of the coil winding 1 are respectively provided with multiple fifth oil guide grooves 52. The multiple fifth oil guide grooves 52 are spaced apart along the first direction. Each fifth oil guide groove 52 extends along the second direction and penetrates the end face of the second pressure plate 5. The second pressure plates 5 are set to maximize the area of ​​the coil winding 1 pressed against the end face, thereby reducing the radial deformation of the coil winding 1 when it is subjected to a sudden short-circuit impact force. The oil inside the transformer can circulate through the coil winding 1, the fourth oil guide groove 51, and the fifth oil guide groove 52.

[0068] like Figure 7As shown, a phase spacer 4 is provided between two adjacent coil windings 1. Multiple third oil guide grooves (not shown in the figure) are spaced apart along a second direction on the phase spacer 4. Each third oil guide groove extends along a third direction, and each third oil guide groove corresponds to a first oil guide groove 21, with both ends of the third oil guide groove connected to the first oil guide groove 21. The phase spacer 4 isolates two adjacent coil windings 1, and the connection between the third oil guide grooves on the phase spacer 4 and the first oil guide grooves 21 enables the circulation of oil within the transformer. Oil in one coil winding 1 flows into the first oil guide groove 21 at one end, then through the third oil guide groove to the first oil guide groove 21 at the other end, and then flows back into the coil winding 1, or flows into the second oil guide groove 31 and flows back into the coil winding 1 through the second oil guide groove 31. Optionally, the phase partition 4 is a wood-laminated board structure. Specifically, the phase partition 4 includes two thin boards with multiple partitions spaced between them, and a third oil guide groove is formed between two adjacent partitions.

[0069] The four corners of the phase partition 4 are also provided with binding holes 41, which can be connected to the connecting component connecting the first pressure plate 3 by passing a strap through the binding holes 41, thereby realizing the fixation of the phase partition 4.

[0070] In some embodiments, see Figure 7 and Figure 8 As shown, the coil winding 1 includes a low-voltage coil winding 11 and a high-voltage coil winding 12, with the high-voltage coil winding 12 sleeved on the outside of the low-voltage coil winding 11.

[0071] A cylindrical epoxy sheet 6 is provided on the inner side of the coil winding 1. Multiple epoxy support strips 7 are provided between the epoxy sheet 6 and the inner wall of the coil winding 1. Specifically, a cylindrical epoxy sheet 6 is provided on the inner side of the low-voltage coil winding 11, and multiple epoxy support strips 7 are provided between the epoxy sheet 6 and the inner wall of the low-voltage coil winding 11. The epoxy support strips 7 and the epoxy sheet 6 serve as internal support components for the coil winding 1. Relying on the reliable resilience and impact resistance of the epoxy material, they effectively reduce the amount of misalignment and expansion of the coil winding 1 in the radial direction when the coil winding 1 is subjected to a sudden short-circuit impact force.

[0072] Multiple epoxy support strips 7 are arranged circumferentially around the epoxy sheet 6, and each epoxy support strip 7 extends along a third direction. Alternatively, multiple epoxy support strips 7 are arranged circumferentially on the epoxy sheet 6, and each epoxy support strip 7 extends circumferentially along the epoxy sheet 6.

[0073] Optionally, a heat-curing adhesive layer is coated on the surface where the epoxy support bar 7 connects to the coil winding 1. During transformer operation, some of the heat generated by the coil winding 1 can be absorbed by the adhesive layer. The adhesive layer, when heated, causes the epoxy support bar 7 and the coil winding 1 to solidify into one piece. When the coil winding 1 is subjected to a sudden short-circuit impact force, this further effectively reduces the amount of misalignment and expansion of the coil winding 1 in the radial direction. At the same time, it can also reduce the heat generation and loss of the coil winding 1 during operation to a certain extent.

[0074] The low-voltage coil winding 11 includes two first conductors, which are made of graphene-based high-conductivity copper. The two first conductors are arranged together and wound in a spiral manner. The two first conductors are interleaved when wound at a preset position. For example, the low-voltage coil winding 11 has two layers. The two conductors can be interleaved at 1 / 3 of the winding of the second layer. The purpose of this internal interleaving is to even out the current balance of the first conductors inside the low-voltage coil winding 11, and to improve the radial tension of the outermost layer of the low-voltage coil winding 11 through a single interleaving, which is beneficial to improving the overall short-circuit withstand capability of the low-voltage coil winding 11.

[0075] Each first conductor is wrapped with a first multi-diamond grid adhesive paper. Under high current overload, while the low-voltage coil winding 11 heats up violently, the solid adhesive on the first multi-diamond grid adhesive paper melts, and the low-voltage coil winding 11 is cured in the axial direction to prevent the low-voltage coil winding 11 from popping out and breaking apart in the axial direction when subjected to short circuit force.

[0076] The cross-sectional shape of the first conductor is rectangular. Using a rectangular cross-sectional shape can increase the axial fill rate of the low-voltage coil winding 11, thereby improving the mechanical strength of the low-voltage coil winding 11.

[0077] During the winding process, trapezoidal insulating protection components are provided at both ends of the low-voltage coil winding 11 along the third direction. The insulating protection components are made of impact-resistant epoxy molding material. The insulating protection components are fixed to both ends of the low-voltage coil winding 11 by heat shrink tape, so that the low-voltage coil winding 11 is not prone to axial breakage when resisting short-circuit impact force.

[0078] The high-voltage coil winding 12 includes a second conductor, which is made of graphene-based high-conductivity copper. The second conductor is wound in a layered manner and has a circular cross-sectional shape. The outer side of the second conductor is wrapped with an epoxy acetal insulating layer. Utilizing the high heat resistance and resilience of epoxy acetal, the high-voltage coil winding 12 can be naturally tensioned radially to a certain extent, which helps improve the overall short-circuit withstand performance. The second conductor can be a single piece.

[0079] The second conductor is wound in multiple layers to form a high-voltage coil winding 12. At least one second multi-diamond-patterned adhesive paper and at least one third multi-diamond-patterned adhesive paper are provided between the layers of the high-voltage coil winding 12. The length of the third multi-diamond-patterned adhesive paper in the third direction is less than the length of the second multi-diamond-patterned adhesive paper in the third direction. The third multi-diamond-patterned adhesive paper is located at the junctions between the layers of the high-voltage coil winding 12. For example, two second multi-diamond-patterned adhesive papers and one third multi-diamond-patterned adhesive paper are provided between the layers of the high-voltage coil winding 12, and the length of the third multi-diamond-patterned adhesive paper in the third direction is half the length of the second multi-diamond-patterned adhesive paper in the third direction. As interlayer insulation, the multi-diamond-patterned adhesive paper not only serves to solidify the radial direction of the high-voltage coil winding 12 when it heats up under high-current overload conditions, but also better dynamically balances the voltage balance between layers, preventing overvoltage breakdown of the high-voltage coil winding 12. The thickness of the second and third multi-diamond grid adhesive paper can be 0.08mm, and no specific limit is made here.

[0080] A high-voltage coil winding 12 is sleeved on the outside of a low-voltage coil winding 11. A high-low voltage main channel is formed between the inner wall of the high-voltage coil winding 12 and the outer wall of the low-voltage coil winding 11, with intervals between them. A first insulating cardboard 13, cardboard support strips 14, and a second insulating cardboard 15 are arranged within the high-low voltage main channel. Specifically, the outer wall of the low-voltage coil winding 11 is covered with the first insulating cardboard 13, and the outer wall of the first insulating cardboard 13 is provided with multiple cardboard support strips 14, spaced apart along a third direction. Each cardboard support strip 14 extends circumferentially along the low-voltage coil winding 11, and the outer side of the multiple cardboard support strips 14 is wrapped with the second insulating cardboard 15. The high-voltage coil winding 12 is sleeved on the outside of the second insulating cardboard 15. This structure, while ensuring sufficient radial short-circuit withstand capability for both the high-voltage and low-voltage coil windings, further prevents the high-voltage coil winding 12 from deforming radially and squeezing inwards into the high-low voltage main channel, thus obstructing the main oil flow circuit, under the premise of ensuring sufficient radial short-circuit withstand capability. Optionally, heat-shrinkable tape is wound around the outer side of the second insulating cardboard 15 to improve the radial tightness of the coil winding 1. The dimensions of both the first insulating cardboard 13 and the second insulating cardboard 15 in the third direction can be slightly smaller than the height of the low-voltage coil winding 11 in the third direction, ensuring that some sidewalls at both ends of the low-voltage coil winding 11 are not covered by either the first insulating cardboard 13 or the second insulating cardboard 15. In other embodiments, a plurality of cardboard support strips 14 are spaced circumferentially along the low-voltage coil winding 11, each cardboard support strip 14 extending in the third direction.

[0081] The outer side of coil winding 1 is covered with an epoxy glass fiber tape layer; specifically, the outer side of high-voltage coil winding 12 is covered with an epoxy glass fiber tape layer. The epoxy glass fiber tape has the characteristics of being viscous at room temperature and plasticizing at high temperature, allowing it to be dynamically and flexibly wound around the outer side of high-voltage coil winding 12 when external manufacturing dimensions are not fixed and external molds cannot be made in advance. Simultaneously, during transformer operation, as coil winding 1 heats up, the epoxy glass fiber tape layer solidifies into glass fiber, greatly enhancing the external radial short-circuit withstand capability of high-voltage coil winding 12. Optionally, the epoxy glass fiber tape is connected to the end of the second conductor of high-voltage coil winding 12 and begins to wind, winding diagonally in a third direction sequentially, and repeatedly covering two layers.

[0082] Example 2

[0083] like Figure 9 As shown, this embodiment provides an assembly method for the short-circuit withstand structure of a graphene copper-based high-conductivity distribution transformer, used to assemble the short-circuit withstand structure of the graphene copper-based high-conductivity distribution transformer provided in Embodiment 1. The assembly method includes:

[0084] Make coil winding 1;

[0085] Iron yoke partitions 2 are installed at both ends of the coil winding 1, so that the iron yoke partitions 2 press against the end faces of two adjacent coil windings 1, and the first oil guide groove 21 is arranged facing the end face of the coil winding 1.

[0086] First pressure plates 3 are installed at both ends of each yoke partition 2, so that the first pressure plates 3 press against the end faces of the yoke partition 2 and the two adjacent coil windings 1, and the two outermost first oil guide grooves 21 are respectively connected to the corresponding second oil guide grooves 31.

[0087] The two ends of the coil winding 1 are respectively pressed against the iron yoke partition 2 and the first pressure plate 3, which increases the radial area of ​​the end of the coil winding 1. The first pressure plate 3 presses against the iron yoke partition 2, so that the iron yoke partition 2 presses against the end face of the coil winding 1, which improves the structural strength of the coil winding 1. When the coil winding 1 is subjected to sudden short circuit impact force, the radial deformation of the coil winding 1 is reduced, and the transformer's ability to resist sudden short circuit impact is improved. The yoke partition 2 is provided with a first oil guide groove 21. The oil in two adjacent coil windings 1 can circulate through the first oil guide groove 21 at both ends of the coil winding 1. The first pressure plate 3 is provided with a second oil guide groove 31. The two outermost first oil guide grooves 21 are respectively connected to the corresponding second oil guide grooves 31. The oil in two adjacent coil windings 1 can also circulate through the first oil guide groove 21 and the second oil guide groove 31 at both ends of the coil winding 1. The setting of the first oil guide groove 21 and the second oil guide groove 31 realizes the circulation of oil inside the transformer and improves the reliability of the transformer.

[0088] In some embodiments, fabricating the coil winding 1 includes:

[0089] Multiple epoxy support strips 7 are fixed on the outside of the cylindrical epoxy sheet 6, so that the multiple epoxy support strips 7 are spaced apart in the circumferential direction.

[0090] An adhesive layer made of heat-curing material is coated on the outer surface of the epoxy support strip 7;

[0091] The first conductor is wound in a spiral manner on the outside of the epoxy support bar 7 to form a low-voltage coil winding 11;

[0092] The outer wall of the low-voltage coil winding 11 is covered with a first insulating paperboard 13. Multiple paperboard support strips 14 are fixed to the outer wall of the first insulating paperboard 13, and the multiple paperboard support strips 14 are spaced apart along a third direction. The outer side of the multiple paperboard support strips 14 is wrapped with a second insulating paperboard 15.

[0093] The second conductor is wound in a layered manner on the outside of the second insulating paperboard 15 to form a high-voltage coil winding 12. During the winding process, at least one second multi-diamond grid adhesive paper and at least one third multi-diamond grid adhesive paper are placed between the layers of the high-voltage coil winding 12, and the third multi-diamond grid adhesive paper is placed at the junction between the layers of the high-voltage coil winding 12.

[0094] An epoxy glass ribbon is wound around the outside of the high-voltage coil winding 12 to form an epoxy glass ribbon layer.

[0095] The specific structure and desired effect of the above steps are described in Example 1, and will not be elaborated further here.

[0096] In some embodiments, the assembly method of the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer further includes: placing a phase spacer 4 between two adjacent coil windings 1. The specific structure and desired effect of the phase spacer 4 are described in Embodiment 1, and will not be elaborated here.

[0097] The assembly method of the short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer further includes: setting a second pressure plate 5 on the end face of the two outermost coil windings 1 respectively, so that the second pressure plate 5 is positioned opposite to the iron yoke partition 2. The specific structure of the second pressure plate 5 and the desired effect are described in Example 1, and will not be elaborated here.

[0098] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. The short-circuit protection structure of a graphene-copper-based high-conductivity distribution transformer, characterized in that, include: Multiple coil windings (1), wherein the wires of the coil windings (1) are made of graphene high-conductivity copper material; A yoke partition (2) is disposed at both ends of the coil winding (1) and presses against the end faces of two adjacent coil windings (1). The two opposite ends of the yoke partition (2) in the first direction are arc-shaped and match the inner diameter of the coil winding (1). The side of the yoke partition (2) facing the end face of the coil winding (1) is provided with a plurality of first oil guide grooves (21) spaced apart along the second direction. Each first oil guide groove (21) extends along the first direction and penetrates both end faces of the yoke partition (2). The first pressure plate (3) is provided at both ends of the iron yoke partition (2) in the second direction. The first pressure plate (3) presses against the iron yoke partition (2) and the end faces of the two adjacent coil windings (1). The first pressure plate (3) is provided with a plurality of second oil guide grooves (31) at intervals along the first direction on the side facing the end face of the coil winding (1). Each second oil guide groove (31) extends along the second direction and penetrates both end faces of the first pressure plate (3). The two outermost first oil guide grooves (21) are respectively connected to the second oil guide grooves (31) on the corresponding side.

2. The short-circuit protection structure of the graphene-copper-based high-conductivity distribution transformer according to claim 1, characterized in that, The first pressure plate (3) has a pressure groove (32) extending in the first direction on one side. The pressure groove (32) penetrates the end face of the first pressure plate (3) on one side in the second direction. The end of the iron yoke partition (2) is placed in the pressure groove (32) and the iron yoke partition (2) abuts against the bottom of the pressure groove (32). The second oil guide groove (31) is connected to the pressure groove (32).

3. The short-circuit protection structure of the graphene-copper-based high-conductivity distribution transformer according to claim 1, characterized in that, The two outermost first oil guide grooves (21) are provided with multiple openings (22) on the side wall near the first pressure plate (3), and the openings (22) are provided one-to-one with the second oil guide grooves (31).

4. The short-circuit protection structure of the graphene-copper-based high-conductivity distribution transformer according to claim 1, characterized in that, A phase spacer plate (4) is provided between two adjacent coil windings (1). A plurality of third oil guide grooves are provided on the phase spacer plate (4) along the second direction. Each third oil guide groove extends along the third direction. The third oil guide groove is provided in a one-to-one correspondence with the first oil guide groove (21), and the two ends of the third oil guide groove are respectively connected to the first oil guide groove (21).

5. The short-circuit protection structure of the graphene-copper-based high-conductivity distribution transformer according to claim 1, characterized in that, The two outermost coil windings (1) have their end faces pressed against a second pressure plate (5). The second pressure plate (5) is positioned opposite to the iron yoke partition (2). The second pressure plate (5) is an arc-shaped plate. The end of the second pressure plate (5) opposite to the iron yoke partition (2) is an arc shape that matches the inner diameter of the coil winding (1). The middle part of the side of the second pressure plate (5) facing the end face of the coil winding (1) is provided with a plurality of fourth oil guide grooves (51) spaced apart along the second direction. Each fourth oil guide groove (51) extends along the first direction and penetrates both end faces of the second pressure plate (5). The two ends of the side of the second pressure plate (5) facing the end face of the coil winding (1) are provided with a plurality of fifth oil guide grooves (52). The plurality of fifth oil guide grooves (52) are spaced apart along the first direction. Each fifth oil guide groove (52) extends along the second direction and penetrates the end face of the second pressure plate (5).

6. The short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer according to claim 1, characterized in that, The inner side of the coil winding (1) is provided with a cylindrical epoxy sheet (6), and a plurality of epoxy support strips (7) are provided between the epoxy sheet (6) and the inner wall of the coil winding (1). The plurality of epoxy support strips (7) are arranged circumferentially around the epoxy sheet (6), and each epoxy support strip (7) extends in a third direction.

7. The short-circuit protection structure of the graphene-copper-based high-conductivity distribution transformer according to claim 6, characterized in that, The surface where the epoxy support bar (7) connects to the coil winding (1) is coated with an adhesive layer that is heat-curable.

8. The short-circuit protection structure of the graphene-copper-based high-conductivity distribution transformer according to claim 1, characterized in that, The coil winding (1) includes a low-voltage coil winding (11), which includes two first wires. The first wires are made of graphene high-conductivity copper material. The two first wires are arranged in parallel and wound in a spiral manner. The two first wires cross-exchange positions when wound to a preset position.

9. The short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer according to claim 8, characterized in that, Each of the first wires is wrapped with a first multi-diamond dot adhesive paper. And / or, the cross-sectional shape of the first conductor is rectangular.

10. The short-circuit protection structure of the graphene-copper-based high-conductivity distribution transformer according to claim 1, characterized in that, The coil winding (1) also includes a high-voltage coil winding (12), which includes a second conductor. The second conductor is made of graphene high-conductivity copper material. The second conductor is wound in a layered manner. The cross-sectional shape of the second conductor is circular. The outer side of the second conductor is wrapped with an insulating layer of epoxy acetal material.

11. The short-circuit protection structure of the graphene copper-based high-conductivity distribution transformer according to claim 10, characterized in that, The second conductor is wound in multiple layers to form the high-voltage coil winding (12). At least one second multi-diamond dotted adhesive paper and at least one third multi-diamond dotted adhesive paper are provided between the layers of the high-voltage coil winding (12). The length of the third multi-diamond dotted adhesive paper in the third direction is less than the length of the second multi-diamond dotted adhesive paper in the third direction. The third multi-diamond dotted adhesive paper is disposed at the junction between the layers of the high-voltage coil winding (12).

12. The short-circuit protection structure of the graphene-copper-based high-conductivity distribution transformer according to claim 1, characterized in that, The coil winding (1) includes a low-voltage coil winding (11) and a high-voltage coil winding (12). The outer wall of the low-voltage coil winding (11) is covered with a first insulating paperboard (13). The outer wall of the first insulating paperboard (13) is provided with a plurality of paperboard support strips (14). The plurality of paperboard support strips (14) are spaced apart along a third direction. Each paperboard support strip (14) extends circumferentially along the low-voltage coil winding (11). The outer side of the plurality of paperboard support strips (14) is wrapped with a second insulating paperboard (15). The high-voltage coil winding (12) is sleeved on the outer side of the second insulating paperboard (15).

13. The short-circuit protection structure of the graphene-copper-based high-conductivity distribution transformer according to claim 1, characterized in that, The outer side of the coil winding (1) is covered with an epoxy glass ribbon layer.

14. A method for assembling the short-circuit withstand structure of a graphene copper-based high-conductivity distribution transformer, used for assembling the short-circuit withstand structure of the graphene copper-based high-conductivity distribution transformer according to any one of claims 1-13, characterized in that, The assembly method includes: Fabricate the coil winding (1); Iron yoke partitions (2) are installed at both ends of the coil winding (1) so that the iron yoke partitions (2) press against the end faces of two adjacent coil windings (1) and the first oil guide groove (21) is arranged facing the end face of the coil winding (1); First pressure plates (3) are installed at both ends of each of the iron yoke partitions (2), so that the first pressure plates (3) press against the end faces of the iron yoke partitions (2) and the two adjacent coil windings (1), and the two outermost first oil guide grooves (21) are respectively connected to the corresponding second oil guide grooves (31).

15. The assembly method of the short-circuit withstand structure of the graphene copper-based high-conductivity distribution transformer according to claim 14, characterized in that, The fabrication of the coil winding (1) includes: Multiple epoxy support strips (7) are fixed on the outside of the cylindrical epoxy sheet (6), such that the multiple epoxy support strips (7) are spaced apart in the circumferential direction; An adhesive layer of heat-curing material is coated on the outer surface of the epoxy support strip (7); The first conductor is wound in a spiral manner on the outside of the epoxy support bar (7) to form a low-voltage coil winding (11); The outer wall of the low-voltage coil winding (11) is covered with a first insulating paperboard (13), and a plurality of paperboard support strips (14) are fixed to the outer wall of the first insulating paperboard (13), such that the plurality of paperboard support strips (14) are spaced apart along a third direction, and the outer side of the plurality of paperboard support strips (14) is wrapped with a second insulating paperboard (15). A second conductor is wound in a layered manner on the outside of the second insulating paperboard (15) to form a high-voltage coil winding (12). During the winding process, at least one second multi-diamond grid adhesive paper and at least one third multi-diamond grid adhesive paper are placed between the layers of the high-voltage coil winding (12), and the third multi-diamond grid adhesive paper is placed at the junction between the layers of the high-voltage coil winding (12). An epoxy glass ribbon is wound around the outside of the high-voltage coil winding (12) to form an epoxy glass ribbon layer.

16. The assembly method of the short-circuit withstand structure of the graphene copper-based high-conductivity distribution transformer according to claim 14, characterized in that, The assembly method further includes: A phase spacer (4) is placed between two adjacent coil windings (1).

17. The assembly method of the short-circuit withstand structure of the graphene copper-based high-conductivity distribution transformer according to claim 14, characterized in that, The assembly method further includes: A second pressure plate (5) is provided on the end face of the two outermost coil windings (1), so that the second pressure plate (5) is positioned opposite to the iron yoke partition (2).

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