High-voltage winding and dry-type transformer

Abstract

Disclosed in the present application is a high-voltage winding, the high-voltage winding comprising a winding body, a high-voltage coil and a high-voltage insulating layer. A conductive wire is wound on the winding body to form the high-voltage coil, the high-voltage coil comprises a plurality of coil segments, and the high-voltage insulating layer wraps the high-voltage coil and the winding body. A support member is provided between any two adjacent coil segments, each support member comprising a plurality of support blocks and a fixing ring, the fixing ring being provided with a plurality of first snap-fit recesses, and the support blocks being fixed on the fixing ring by means of the first snap-fit recesses. The high-voltage winding of the present application is provided with the support members for fixing the relative position of the coil, thereby avoiding displacement of the coil during movement and transportation, mold assembly, and forming stages of the high-voltage winding. Also disclosed in the present application is a dry-type transformer.

Description

High-voltage winding and dry-type transformer TECHNICAL FIELD

[0001] The present application relates to the technical field of dry-type transformers, and more particularly to a high-voltage winding and a dry-type transformer. BACKGROUND

[0002] Currently, the high-voltage winding of the dry-type transformer is of the wire-wound layer type or the foil-wound layer type, and a spacer needs to be placed between adjacent coils to prevent the coils from being displaced during transfer, mold assembly and molding. The placement and fixation of the traditional spacer between the coils are difficult, and there is a risk of displacement or even falling off, which requires additional binding and is cumbersome to operate. In addition, the size of the spacer needs to be customized according to the distance between the adjacent coils of the high-voltage winding of different specifications, which is costly. Furthermore, during the molding stage of the high-voltage winding, the spacer is easily displaced due to the stress of the molding insulating medium, which in turn causes the coils to be displaced, affecting the quality of the high-voltage winding. SUMMARY

[0003] In view of the deficiencies of the prior art, the purpose of the present application is to provide a high-voltage winding, which is provided with a support between any two adjacent coils, and the support is simple and reliable in structure, easy to install and flexible, can fully abut against the high-voltage coil, effectively avoids the displacement of the coil caused by the displacement or even falling off of the support, and ensures the quality of the high-voltage winding.

[0004] To achieve the above-mentioned purpose, the technical means adopted by the present application is as follows: a high-voltage winding, which comprises a winding body, a high-voltage coil and a high-voltage insulating layer, the wire is wound on the winding body to form the high-voltage coil, the high-voltage coil comprises a plurality of coil segments, and the high-voltage insulating layer wraps the high-voltage coil and the winding body; a support is arranged between any two adjacent coil segments, the support comprises a plurality of support blocks and a fixing ring, a plurality of first clamping grooves are arranged on the fixing ring, and the support blocks are fixed on the fixing ring through the first clamping grooves. The support is used for abutting against the coil to prevent the coil from being displaced during the transfer, mold assembly and molding of the high-voltage winding.

[0005] Preferably, the support block comprises at least one hollow part, and the support block is connected with the first clamping groove through the hollow part. The hollow part can reduce the impact force of the silicone rubber on the support during injection, so as to avoid damage to the support due to the large injection pressure. The hollow part can also make the fixing of the support block and the fixing ring more stable and not easy to fall off.

[0006] Preferably, the sum of the groove depth of the first clamping groove and the depth of the hollow part is equal to the ring width of the fixing ring. In this way, it can be ensured that the support block can abut against the outer circumferential surface of the winding body.

[0007] Preferably, the support block abuts against the outer circumferential surface of the winding body, and the top of the hollow part abuts against the groove bottom of the first clamping groove. In this way, it can be prevented that the innermost layer of the coil is displaced, and the support effect can be ensured.

[0008] Preferably, the support block is of an n type, and the support block comprises a hollow part.

[0009] Preferably, the support block is of an H type, and the support block comprises two hollow parts.

[0010] In this way, the n type or the H type of the support block can be selected according to the specific structure of the coil winding, so that the application of the support member is more flexible, and the application range is wider.

[0011] Preferably, the width of the support block matches the slot width of the first clamping slot. When the support block is clamped into the first clamping slot, the connection is tight and not easy to loosen.

[0012] Preferably, the plurality of first clamping slots are arranged on the outer periphery of the fixing ring and uniformly distributed along the circumferential direction of the fixing ring. The support block can be conveniently fixed on the fixing ring.

[0013] Preferably, the fixing ring is further provided with a plurality of second clamping slots, and the plurality of second clamping slots are arranged on the inner periphery of the fixing ring and uniformly distributed along the circumferential direction of the fixing ring. The arrangement of the second clamping slots facilitates the flow of the silicone rubber during injection of the high-voltage insulation layer.

[0014] Preferably, the width of the support member is greater than or equal to the ring width of the coil. The support member can better fix the coil, and prevent the coil from being higher than the support member, thereby causing the outer coil to be displaced without being limited by the support member.

[0015] Preferably, the high-voltage insulation layer is made of high-temperature vulcanized silicone rubber or liquid silicone rubber, which improves the insulation performance and mechanical performance of the high-voltage winding as a whole.

[0016] The application also provides a dry-type transformer, which comprises a core, a low-voltage winding and a high-voltage winding, the low-voltage winding is sleeved outside the core, and the high-voltage winding is sleeved outside the low-voltage winding.

[0017] The high-voltage winding of the application is fixed by the support member, which can effectively prevent the high-voltage coil from being displaced during transfer, transportation, mold assembly and molding process, and ensure the quality of the high-voltage winding.

[0018] Meanwhile, the support member of the application is formed by clamping the support block and the fixing ring, which is simple and reliable in structure, convenient to process, flexible to install, and does not need to be additionally bound, so that the operation efficiency is high, and the structure and the number of the support member can be flexibly selected according to the structure of the high-voltage coil, so that the application range is wide. BRIEF DESCRIPTION OF DRAWINGS

[0019] FIG. 1 is a front view of a dry-type transformer 10 according to an embodiment of the application;

[0020] FIG. 2 is a top view of the dry-type transformer 10 according to an embodiment of the application;

[0021] Fig. 3 is a front view of the assembled core 110 according to an embodiment of the present application;

[0022] Fig. 4 is an enlarged view of G in Fig. 2;

[0023] Fig. 5 is a perspective view of a high-voltage coil 1320 wound on a winding body 1310 according to an embodiment of the present application;

[0024] Fig. 6 is a circuit diagram of the high-voltage coil 1320 according to an embodiment of the present application;

[0025] Fig. 7 is a perspective view of a high-voltage winding 130 according to an embodiment of the present application;

[0026] Fig. 8 is a perspective view of a plurality of support members 140 according to an embodiment of the present application;

[0027] Fig. 9 is a perspective view of a fixing ring 1420 according to an embodiment of the present application;

[0028] Fig. 10 is a perspective view of a support block 1410 according to an embodiment of the present application;

[0029] Fig. 11 is a perspective view of a support block 1410 according to another embodiment of the present application. DETAILED DESCRIPTION

[0030] In accordance with the requirements, a specific embodiment of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present application, which can be embodied in various forms. Therefore, the specific details disclosed herein should not be considered as limiting, but merely as a representative basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application in any appropriate manner in practice, including the use of various features disclosed herein and in combination with features that can not be explicitly disclosed herein.

[0031] As shown in Figs. 1-3, the dry-type transformer 10 is a three-phase transformer, which is respectively an A-phase, a B-phase and a C-phase, i.e., the dry-type transformer 10 includes three single-phase transformers 100. According to different structures of the core 110, the three transformers 100 can be arranged in a linear type or a triangular structure, and the three transformers 100 are in a symmetrical structure. In addition, the dry-type transformer 10 can also be an isolation transformer, a frequency conversion transformer, a test transformer, etc.

[0032] In an embodiment, the three transformers 100 are arranged in a linear structure, and the dry-type transformer 10 comprises a core 110, three low-voltage windings 120 and three high-voltage windings 130. The core 110 comprises three columnar core bodies 111, an upper yoke 112 located at the upper ends of the three columnar core bodies 111, and a lower yoke 113 located at the lower ends of the three columnar core bodies 111. The three low-voltage windings 120 are respectively sleeved on the outer periphery of the three columnar core bodies 111, and the three high-voltage windings 130 are respectively sleeved on the outer periphery of the three low-voltage windings 120, that is, the three columnar core bodies 111, the three low-voltage windings 120 and the three high-voltage windings 130 are sequentially and one-to-one corresponding sleeved from inside to outside. The columnar core body 111 is formed by stacking a plurality of silicon steel sheets, and the plurality of silicon steel sheets are fixed by binding with a binding tape. The radial cross section of the columnar core body 111 is substantially oval or circular or other shapes, as long as it can be accommodated in the hollow cavity of the low-voltage winding 120, which is not limited herein. The upper yoke 112 and the lower yoke 113 are also formed by stacking a plurality of silicon steel sheets, so that the three columnar core bodies 111 are fixedly connected, thereby forming a three-phase core 110 as shown in FIG. 3.

[0033] An outer side of the core 110 is provided with a core clamp 150 for clamping the core 110. The core clamp 150 can be a channel steel piece or a hollow pipe piece, which is not limited herein. The core clamp 150 is provided as four, two of which are symmetrically located on both sides of the upper end of the core 110 and above the high-voltage winding 130, and the other two are symmetrically located on both sides of the lower end of the core 110 and below the high-voltage winding 130.

[0034] As shown in FIGS. 2 and 4, the low-voltage winding 120 comprises a copper foil 121, a low-voltage insulation layer 122 and a support strip 123, and the copper foil 121 and the low-voltage insulation layer 122 are alternately arranged. The copper foil 121 is formed by winding an entire copper foil, and the low-voltage insulation layer 122 is overlapped with the copper foil 121 and is co-wound. The low-voltage winding 120 is provided with at least one heat dissipation air channel located between adjacent copper foils 121 and low-voltage insulation layers 122, and the support strip 123 is located in the heat dissipation air channel for supporting and isolating the adjacent copper foils 121 and low-voltage insulation layers 122.

[0035] The low-voltage insulation layer 122 adopts polyimide impregnated paper, which can be SHS-P diphenyl ether pre-impregnated material. The low-voltage insulation layer 122 is formed by impregnating diphenyl ether resin with polyimide film and polysulfone fiber non-woven soft composite material and then baking. Of course, the low-voltage insulation layer can also adopt DMD insulation paper or silicone rubber film, or other insulation materials, which can be selected according to different insulation heat resistance grades of the dry-type transformer.

[0036] The insulation support strip 123 is made of glass fiber impregnated epoxy resin or aramid fiber impregnated epoxy resin, which is not limited herein. In addition, the insulation support strip 123 is a long strip with an I-shaped cross section, which has more stable mechanical strength. Of course, the insulation support strip can also be a long strip with a square cross section or other shapes, as long as it can play a supporting and isolating role.

[0037] As shown in FIGS. 5-7, the high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320, and a high-voltage insulation layer 1330. The high-voltage coil 1320 is formed by winding a wire on the winding body 1310, the high-voltage coil 1320 includes a plurality of coil segments, and the high-voltage insulation layer 1330 wraps the high-voltage coil 1320 and the winding body 1310. Specifically, the winding body 1310 is a support cylinder structure, the winding body 1310 is a hollow cylinder, which can be a hollow circular cylinder, a hollow elliptical cylinder, or other hollow cylindrical bodies; the plurality of coil segments are arranged at intervals along the axial direction of the winding body 1310.

[0038] The winding body 1310 is a hollow pipe formed by winding and curing glass fiber impregnated epoxy resin or by pultrusion, which can also be a hollow pipe formed by pultrusion and winding of glass fiber or aramid fiber impregnated epoxy resin, and can also be a hollow pipe formed by winding and curing aramid fiber impregnated epoxy resin or by pultrusion, or made of other composite materials, which is not limited herein.

[0039] Taking the A-phase transformer 100 as an example, the wire is wound circumferentially on the outer peripheral surface of the winding body 1310 to form the high-voltage coil 1320. Specifically, the high-voltage coil 1320 is arranged at intervals in the axial direction of the winding body 1310, and the wire has two wire outlets at the ends after winding, which are a first wire outlet D and a second wire outlet X. The wire has six taps in the middle of the winding body 1310 along the axial direction, which are tap 2, tap 3, tap 4, tap 5, tap 6, and tap 7, and the six taps are used to connect the tap changers.

[0040] In an application scenario, the high-voltage coil 1320 includes four coil segments, which are a first coil segment 1321, a second coil segment 1322, a third coil segment 1323, and a fourth coil segment 1324. Further, the extension length of each coil segment of the high-voltage coil 1320 along the axial direction of the winding body 1310 is defined as the width of the coil.

[0041] In an embodiment, the four section coils are all foil-wound layer coils. In this case, the conductive wire is a thin and wide conductive foil, and an interlayer insulation material is arranged between any two adjacent layers of the conductive foil of each section coil, that is, the conductive foil and the interlayer insulation material are overlapped and then jointly wound to form the foil-wound layer coil. The conductive foil can be a copper foil or an aluminum foil, etc. The interlayer insulation material can be a silica gel cloth, an electrical composite material, a glass fiber mesh, etc., which can meet the interlayer insulation performance of the high-voltage winding 130 and different heat resistance levels, and is not limited here.

[0042] In another embodiment, the four section coils are all wire-wound layer coils. In this case, the conductive wire is a continuous wire, and an insulation layer is coated outside the wire. The insulation layer can be coated by a film coating, an enamel coating, a silk coating, etc. The insulation layer can be a polyimide film or a glass fiber film, or the insulation layer is a polyester paint or other insulation materials, or a combination of multiple insulation materials can be used, which can meet the heat resistance level of the high-voltage winding 130, and is not limited here.

[0043] Further, as shown in FIGS. 8-11, in order to make the winding of the wire more stable, the high-voltage winding 130 further comprises a plurality of support members 140, one support member 140 is arranged between any two adjacent coils of the high-voltage coil 1320, each support member 140 comprises a plurality of support blocks 1410 and a fixing ring 1420. The fixing ring 1420 is annular and matches the overall shape of the high-voltage winding 130, the fixing ring 1420 is formed by butting two symmetrical and identical semi-annular components, the butting surfaces of the two semi-annular components are smooth, so that there is no obvious step or protrusion at the butting place of the fixing ring 1420, which ensures uniform stress of the fixing ring 1420 and avoids local stress concentration. At least one binding hole 1423 is arranged at the butting edge of each semi-annular component, when the fixing ring 1420 is assembled, the binding belt is passed through the corresponding binding holes 1423 of the two semi-annular components and the two semi-annular components are fixed together, so as to form a complete fixing ring 1420, which can ensure the stability and reliability of the fixing ring 1420 during use. For example, the high-voltage winding 130 is a hollow elliptical cylinder, and the fixing ring 1420 is an elliptical ring formed by butting two semi-elliptical ring components; for another example, the high-voltage winding 130 is a hollow cylinder, and the fixing ring 1420 is a circular ring formed by butting two semi-circular ring components. The fixing ring 1420 is provided with a plurality of first clamping grooves 1421, and the plurality of support blocks 1410 are fixed on the fixing ring 1420 through the plurality of first clamping grooves 1421. The support member 140 is formed by clamping the support block 1410 and the fixing ring 1420, which is simple and reliable in structure, convenient to process, flexible to install, and does not need to be bound additionally, and has high work efficiency. The plurality of support members 140 cooperate with each other to effectively abut and fix the coils of the high-voltage coil 1320, so as to avoid displacement of the high-voltage coil 1320 during transfer, transportation, mold assembly and molding stage, and affect the quality of the high-voltage winding 130.

[0044] The number of coils of the high-voltage coil 1320 is determined according to the voltage grade of the high-voltage winding 130, and the higher the voltage grade, the more the number of coils. In this embodiment, considering the voltage grade and manufacturing cost of the high-voltage winding 130, the high-voltage coil 1320 is provided with four coils, and correspondingly, the support member 140 is provided with three, in other embodiments, the number of support members can be adjusted according to the number of coils of the high-voltage coil, which is not limited here.

[0045] The inner diameter of the fixing ring 1420 is matched with the outer circumference of the winding body 1310, so that the fixing ring 1420 can be arranged around the circumference of the winding body 1310, and a plurality of fixing rings 1420 are arranged along the axial direction of the winding body 1310 at intervals, so that one fixing ring 1420 is arranged between any two adjacent coils, and the distance between the outer circumferential wall and the inner circumferential wall of the fixing ring 1420 along the radial direction of the fixing ring 1420 is defined as the ring width of the fixing ring 1420. A plurality of first clamping grooves 1421 are arranged on the outer circumference of the fixing ring 1420 and are uniformly distributed along the circumferential direction of the fixing ring 1420, so that the support block 1410 can be conveniently fixed on the fixing ring 1420. The distance between the opposite two sides of the first clamping groove 1421 along the circumferential direction of the fixing ring 1420 is defined as the groove width of the first clamping groove 1421.

[0046] A plurality of second clamping grooves 1422 are further arranged on the fixing ring 1420, and the plurality of second clamping grooves 1422 are arranged on the inner circumference of the fixing ring 1420 and are uniformly distributed along the circumferential direction of the fixing ring 1420, and the distance between the opposite two sides of the second clamping groove 1422 along the circumferential direction of the fixing ring 1420 is defined as the groove width of the second clamping groove 1422. In this embodiment, the groove width of the second clamping groove 1422 is greater than the groove width of the first clamping groove 1421, and the arrangement of the second clamping groove 1422 facilitates the flow of silicone rubber during injection of the high-voltage insulation layer 1330, so as to avoid displacement of the fixing ring 1420 due to a large injection pressure, thereby causing the coil to deviate and affecting the quality of the high-voltage winding 130; the arrangement of the second clamping groove 1422 also facilitates the connection of the wires between adjacent coils after winding, that is, the wires of one coil are connected to the wires of the adjacent coil by penetrating the second clamping groove 1422. In other embodiments, the groove width of the second clamping groove can also be adjusted according to the wire specifications, as long as it can facilitate the flow of silicone rubber during injection, which is not limited herein. It can be understood that the positions of the second clamping groove 1422 and the first clamping groove 1421 on the fixing ring 1420 can correspond to each other, for example, each second clamping groove 1422 and each first clamping groove 1421 are arranged on the inner circumference and the outer circumference of the fixing ring 1420, respectively; or the positions of the second clamping groove 1422 and the first clamping groove 1421 on the fixing ring 1420 can also be arranged without correspondence, for example, each second clamping groove 1422 and each first clamping groove 1421 are arranged on the inner circumference and the outer circumference of the fixing ring 1420 in a staggered manner, as long as the arrangement of the second clamping groove 1422 and the first clamping groove 1421 meets the structural strength requirement of the fixing ring 1420, which is not limited herein.

[0047] The support block 1410 comprises at least one hollow part 1411, and the support block 1410 is connected with the first clamping groove 1421 of the fixing ring 1420 through the hollow part 1411. The hollow part 1411 can facilitate the flow of the silicone rubber during injection, reduce the impact force of the silicone rubber on the support 140 during injection, avoid damage to the support 140 due to a large injection pressure, and affect the winding quality. The hollow part 1411 can also make the clamping connection between the support block 1410 and the fixing ring 1420 more stable and less likely to fall off.

[0048] For convenience of description, when the support 140 is installed on the outer periphery of the winding body 1310, the length of the support block 1410 along the axial direction of the winding body 1310 is defined as the thickness of the support block 1410, the length of the support block 1410 along the radial direction of the winding body 1310 is defined as the height of the support block 1410, and the length of the support block 1410 along the circumferential direction of the winding body 1310 is defined as the width of the support block 1410. The width of the support block 1410 matches the slot width of the first clamping groove 1421, so that the support block 1410 is tightly connected when clamped into the first clamping groove 1421 and is less likely to loosen. This prevents the high-voltage coil 1320 from being displaced during transfer and transportation, mold assembly and molding stages, and effectively ensures the segment distance of the high-voltage coil 1320. If the slot width of the first clamping groove 1421 is greater than the width of the support block 1410, a gap is left between the fixing ring 1420 and the support block 1410. During the wire winding process and the high-voltage insulation layer 1330 molding process, the support block 1410 is prone to loosen on the fixing ring 1420 and cannot fix the coil, thereby causing the high-voltage coil 1320 to be displaced and affecting the quality of the high-voltage winding 130. If the slot width of the first clamping groove 1421 is less than the width of the support block 1410, the support block 1410 cannot be clamped into the first clamping groove 1421 and cannot fix the coil. The thickness of the support block 1410 can be designed according to the distance between the adjacent two coils of the high-voltage coil 1320, and the height of the support block 1410 can be designed according to the size of the high-voltage coil 1320 supported thereby, which is not specifically limited herein.

[0049] The distance from one end of the hollow part 1411 to the other end of the hollow part 1411 along the radial direction of the winding body 1310 is defined as the depth of the hollow part 1411, and the depth of the first clamping groove 1421 along the radial direction of the winding body 1310 is defined as the slot depth of the first clamping groove 1421. The sum of the slot depth of the first clamping groove 1421 and the depth of the hollow part 1411 is equal to the ring width of the fixing ring 1420. In this way, when the support 140 is installed on the outer periphery of the winding body 1310, the support block 1410 can abut against the outer peripheral surface of the winding body 1310, thereby preventing the innermost layer of the coil from being displaced and ensuring the support effect.

[0050] In an embodiment, referring to FIG. 10, the support block 1410 can be in an n-shaped block structure, and the support block 1410 includes one hollow part 1411. In another embodiment, referring to FIG. 11, the support block 1410 can also be in an H-shaped block structure, and the support block 1410 includes two identical hollow parts 1411. The specific size of the H-shaped support block 1410 and the n-shaped support block 1410 can be adjusted according to the use requirements, and the details are as described above, which will not be repeated here.

[0051] When installed, the hollow part 1411 of the support block 1410 is clamped on the outside of the fixing ring 1420 through the first clamping groove 1421, and the two sides of the hollow part 1411 on the support block 1410 are clamped on the two side surfaces of the fixing ring 1420, that is, the hollow part 1411 of the n-shaped support block 1410 is clamped in the first clamping groove 1421, or any one of the hollow parts 1411 of the H-shaped support block 1410 is clamped in the first clamping groove 1421, so that the support block 1410 abuts against the outer circumferential surface of the winding body 1310, and the top of the hollow part 1411 abuts against the groove bottom of the first clamping groove 1421, ensuring that the support block 1410 is tightly connected with the fixing ring 1420. A plurality of support blocks 1410 are installed in a plurality of first clamping grooves 1421 on the fixing ring 1420 in the above-mentioned manner, respectively, and the assembly of the support member 140 is completed. The assembly process of the support member 140 is simple and efficient.

[0052] The support block 1410 and the fixing ring 1420 are both made of insulating and high-temperature-resistant materials, such as glass fiber reinforced epoxy resin composite material plate, glass fiber reinforced polyimide composite material plate, etc., and are processed by milling process. The above-mentioned materials have good high-temperature resistance and electrical insulation performance, and the process is simple and the processing period is short.

[0053] The contact surfaces of the support block 1410 and the fixing ring 1420 can also be further fixed by an adhesive, and the adhesive is preferably a high-temperature-resistant adhesive, so that the support member 140 is more stable and reliable, without the need for additional binding, improving the work efficiency, and can withstand the high temperature during the formation of the high-voltage insulation layer 1330. The setting of the support member 140 can ensure the distance between the coils when the mold is erected, thereby ensuring the insulation performance of the high-voltage winding 130.

[0054] When the support 140 is installed on the winding body 1310, the distance between the end of the support 140 farthest from the winding body 1310 and the end of the support 140 closest to the winding body 1310 along the radial direction of the winding body 1310 is defined as the width of the support 140. Specifically, when the height of the support block 1410 is less than the ring width of the fixing ring 1420, the width of the support 140 is equal to the ring width of the fixing ring 1420; when the height of the support block 1410 is equal to the ring width of the fixing ring 1420, the width of the support 140 is also equal to the ring width of the fixing ring 1420; when the height of the support block 1410 is greater than the ring width of the fixing ring 1420, the width of the support 140 is equal to the height of the support block 1410. Along the radial direction of the winding body 1310, the distance from the outside of the wire of the outermost layer of the high-voltage coil 1320 to the outer circumferential surface of the winding body 1310 is defined as the ring width of the coil, and the width of the support 140 is greater than or equal to the ring width of the coil, so that the support 140 can abut against the side wall of the entire high-voltage coil 1320 in the radial direction of the winding body 1310, and the coil can be better fixed, thereby preventing the wire of the outer layer of the coil from not being supported by the support 140 when the ring width of the coil is greater than the width of the support 140, so that the coil is displaced, thereby affecting the quality of the high-voltage winding 130.

[0055] In an application scenario, along the axial direction of the winding body 1310, the widths of the coils of the high-voltage coil 1320 are uniform, i.e., the two sides of each coil are flush.

[0056] Continuing to refer to FIGS. 5-7, before the high-voltage coil 1320 is wound, the positions of the coils are marked on the winding body 1310, i.e., the width of each coil and the inter-coil distance between the coils are marked, and then the supports 140 are installed on the winding body 1310, so that each support 140 is located at the inter-coil region of each coil.

[0057] For convenience of description, the upper end of the winding body 1310 is defined as the first end, and the lower end of the winding body 1310 is defined as the second end, so that from the first end to the second end of the winding body 1310, the high-voltage coil 1320 includes the first coil 1321, the second coil 1322, the third coil 1323, and the fourth coil 1324 in sequence.

[0058] In an embodiment, the four section coils are all layer structures, and the layers of each section coil are padded with interlayer insulation material to reduce the voltage difference between each section coil. At this time, the interlayer insulation material is arranged along the axial direction of the high-voltage winding 130, that is, the axial direction of the winding body 1310, to prevent the electric field strength between the layers from being higher than the critical value that the insulation film of the insulated wire can withstand. In addition, the layer structure in each section coil has good lightning impulse resistance, and the economic advantage is more obvious. The interlayer insulation material can be silicone cloth, glass fiber mesh cloth, electrical composite material, etc. The interlayer insulation material can be arranged in one layer, two layers or three layers, which is determined according to different design conditions and is not limited here.

[0059] Specifically, when winding the wire, one wire is used to wind the fourth section coil 1324. That is, in the marked area of the fourth section coil 1324 on the winding body 1310, the wire is wound from the first end to the second end of the winding body 1310 until the wire is wound to the marked width and tied to form the first layer of wire of the fourth section coil 1324. Then, the interlayer insulation material is padded on the first layer of wire. Then, the wire is wound on the interlayer insulation material according to the "Z" shape winding method, that is, the wire is pulled back to the original position of the first layer of wire and wound above the first layer of wire, and then tied after winding to the marked width, and the interlayer insulation material is padded again. Repeat the above operations until the winding of the fourth section coil 1324 is completed. The outer turn wire end (i.e., the wire end) of the fourth section coil 1324 at the second end of the winding body 1310 forms the second wire outlet end X exposed to the outside of the high-voltage insulation layer 1330. For convenience of description, the inner turn wire end of each section coil, that is, the end of the wire where the winding starts, is defined as the wire head end, and the outer turn wire end of each section coil, that is, the end of the wire where the winding is completed, is defined as the wire end.

[0060] Another wire is used to wind the second section coil 1322. In the marked area of the second section coil 1322 on the winding body 1310, the wire is wound from the first end to the second end of the winding body 1310 according to the above method, which will not be described here. The difference is that during the winding of the second section coil 1322, the wire also needs to be pulled out through the lead-out wire to form three taps, that is, the tap 6, the tap 4 and the tap 2 as shown in FIG. 6. The lead-out wire can be pulled out by the wire double folding method, that is, in the winding of the coil, the wire is folded outward at the tap position to form a lead-out wire, and then the insulation layer is wrapped around the lead-out wire, and then the second section coil 1322 is continued to be wound. Alternatively, the lead-out wire can also be pulled out by the wire welding method, that is, in the winding of the coil, the lead-out wire is welded at the tap position, and then the insulation layer is wrapped around the welding position and the lead-out wire, and then the second section coil 1322 is continued to be wound.

[0061] After the fourth segment coil 1324 and the second segment coil 1322 are both wound, the winding body 1310 is reversed at the head and tail, so that the first end and the second end of the winding body 1310 are exchanged, and then the first segment coil 1321 and the third segment coil 1323 are wound.

[0062] Before the first segment coil 1321 is wound, the first end of the wire of the second segment coil 1322 is led out through one of the second clamping grooves 1422 on the fixed ring 1420 adjacent to the second segment coil 1322, and is welded with the first end of the wire of the first segment coil 1321. After the welding position is covered with an insulating layer, the wire of the first segment coil 1321 is also wound in a "Z" shape from the second end to the first end of the winding body 1310, which is similar to the fourth segment coil 1324. The first end of the wire of the first segment coil 1321 located at the outer turn of the first end of the winding body 1310 forms a first wire outlet end D exposed to the outside of the high-voltage insulating layer 1330.

[0063] Before the third segment coil 1323 is wound, the first end of the wire of the fourth segment coil 1324 is led out through one of the second clamping grooves 1422 on the fixed ring 1420 adjacent to the fourth segment coil 1324, and is welded with the first end of the wire of the third segment coil 1323. After the welding position is covered with an insulating layer, the wire of the third segment coil 1323 is also wound in a "Z" shape from the second end to the first end of the winding body 1310, which is similar to the second segment coil 1322. The wire is led out through the lead-out wire to form three taps, i.e., the tap 3, the tap 5, and the tap 7 shown in FIG. 6. Thus, the high-voltage coil 1320 is wound. Each segment coil formed by winding the wire is perpendicular to the axial direction of the winding body 1310, which is convenient for winding and good in wire arrangement and mechanical strength.

[0064] By winding the four segment coils in the above manner, on the one hand, the connection between the wires of adjacent segment coils is more convenient and faster, i.e., the first end of the wire of the first segment coil 1321 and the first end of the wire of the second segment coil 1322, and the first end of the wire of the third segment coil 1323 and the first end of the wire of the fourth segment coil 1324 are close to each other, which is convenient for welding. On the other hand, it is also convenient to lead out the wire outlet ends of the high-voltage winding 130, i.e., the wire end of the first segment coil 1321 is located at the first end of the winding body 1310, and the wire end of the fourth segment coil 1324 is located at the second end of the winding body 1310, so that the first wire outlet end D and the second wire outlet end X can be directly led out, respectively. In addition, compared with the winding method in which the four segment coils are wound from the first end to the second end of the winding body 1310 in sequence, the adjacent two segment coils can be connected without additional inclined wires, and the first end of the wire does not need to be led out from the inner turn of the wire as the wire outlet end of the winding body 1310. Thus, the wire connection and wire leading out are facilitated, the wire usage is effectively saved, and the cost is reduced.

[0065] In another embodiment, each of the four sections of the coil is a foil-wound layer structure, i.e., each section of the coil is formed by overlapping and winding the conductive foil and the interlayer insulation material, and the width of the conductive foil and the interlayer insulation material in each section of the coil along the axial direction of the winding body 1310 is the width of the section of the coil.

[0066] During winding, the first section of the coil 1321 is wound first, and the conductive foil and the interlayer insulation material that are overlapped in place are wound to the specified number of layers in the marked area of the first section of the coil 1321 on the winding body 1310, and the winding of the first section of the coil 1321 is completed. The first section of the coil 1321 is located at the first end of the winding body 1310, and the first end of the conductive foil forms a first outgoing terminal D exposed to the outside of the high-voltage insulation layer 1330. For ease of description, the end of the conductive foil where the winding of each section of the coil starts is defined as the first end of the conductive foil, and the end of the conductive foil where the winding of each section of the coil is completed is defined as the last end of the conductive foil.

[0067] Then, the second section of the coil 1322, the third section of the coil 1323, and the fourth section of the coil 1324 are wound in the above-described manner, except that during the winding of the second section of the coil 1322, the conductive foil needs to be led out three taps, i.e., the tap 6, the tap 4, and the tap 2 as shown in FIG. 6, and during the winding of the third section of the coil 1323, the conductive foil also needs to be led out three taps, i.e., the tap 3, the tap 5, and the tap 7 as shown in FIG. 6; the fourth section of the coil 1324 is located at the last end of the conductive foil at the second end of the winding body 1310, and forms a second outgoing terminal X exposed to the outside of the high-voltage insulation layer 1330. The leading-out manner of the taps and the connection manner of each section of the coil can be implemented by using the existing technology, and are not specifically limited herein. Thus, the winding of the high-voltage coil 1320 is completed. This winding method is simple to operate and efficient, and each section of the coil is perpendicular to the axial direction of the winding body 1310, which is convenient to wind and the arrangement of the conductive wire is neat, and the mechanical strength is good.

[0068] In another application scenario, in combination with FIG. 5, the high-voltage coil 1320 adopts a wire-wound layer structure, each section of the coil includes an equal-width part 1340 and a decreasing part 1350. The equal-width part 1340 includes the first layer of conductive wires and a plurality of layers of conductive wires with a winding turn number equal to the outer periphery of the first layer of conductive wires, that is, the winding widths of the plurality of layers of conductive wires in the equal-width part 1340 are equal, and the winding width of the first layer of conductive wires. The decreasing part 1350 includes a plurality of layers of conductive wires with a winding turn number less than the outer periphery of the equal-width part 1340 compared with the first layer of conductive wires. The decreasing part 1350 includes a plurality of layers of conductive wires with different winding widths, and the width of the coil of the decreasing part 1350 gradually decreases from the inside to the outside along the radial direction of the winding body 1310. Each decreasing group coil of the decreasing part 1350 is wound with a preset number of layers to have a preset thickness. In this embodiment, the decreasing part 1350 includes a first decreasing group 1351, a second decreasing group 1352, a third decreasing group 1353, and a fourth decreasing group 1354. The coils along the radial direction of the winding body 1310 are sequentially arranged from the inside to the outside as the equal-width part 1340, the first decreasing group 1351, the second decreasing group 1352, the third decreasing group 1353, and the fourth decreasing group 1354. The winding widths of the plurality of layers of conductive wires in each section of the coil remain unchanged from the inside to the outside along the radial direction of the winding body 1310 to form the equal-width part 1340, and then gradually decrease to form the decreasing part 1350. That is, the innermost layer of conductive wires is the most, and the outermost layer of conductive wires is the least. In this way, as the number of outer layers of conductive wires decreases, the insulation distance between the coils can be increased, thereby enhancing the insulation reliability of the high-voltage winding 130.

[0069] When the conductive wires of the equal-width part 1340 are wound, the first layer of conductive wires is wound according to the width of the marking area, and the winding turn number of the conductive wires is the full turn number N0. Then, a plurality of layers of conductive wires are wound on the outer periphery of the first layer of conductive wires according to the full turn number N0, until the equal-width part 1340 is wound.

[0070] When the conductive wires of the decreasing part 1350 are wound, the first decreasing group 1351, the second decreasing group 1352, the third decreasing group 1353, and the fourth decreasing group 1354 are sequentially wound on the outer periphery of the outermost layer of conductive wires of the equal-width part 1340. Among them, the first decreasing group 1351 includes a plurality of layers of conductive wires with equal widths, and the winding turn number of the conductive wires is N1, N1=N0-M, where M is a positive integer, and N0>4M. The second decreasing group 1352 includes a plurality of layers of conductive wires with equal widths, and the winding turn number of the conductive wires is N2, N2=N0-2M. The third decreasing group 1353 includes a plurality of layers of conductive wires with equal widths, and the winding turn number of the conductive wires is N3, N3=N0-3M. The fourth decreasing group 1354 includes a plurality of layers of conductive wires with equal widths, and the winding turn number of the conductive wires is N4, N4=N0-4M. In other embodiments, the decreasing part can include two, three, five or more decreasing groups, and the number of full turns N0 can be adjusted according to the size of M and the number of decreasing groups, which is not specifically limited here.

[0071] Further, when winding the coil, one side of each section of the coil is a flush side, and the other side is a stepped side. The conductive wire on the flush side is wound against the support member 140. Since the decreasing portion 1350 includes several layers of conductive wire with different widths, the other side of the coil forms a stepped side. The flush sides of any two adjacent sections of the coil are arranged opposite to each other or the stepped sides are arranged opposite to each other. In this way, on the stepped sides of the adjacent sections of the coil arranged opposite to each other, the insulation distance between the two sections of the coil greatly increases with the decrease in the outer layer of the conductive wire, thereby greatly enhancing the insulation reliability of the high-voltage winding 130. In this embodiment, the flush sides of the first section of the coil 1321 and the second section of the coil 1322 are arranged opposite to each other, and the stepped sides are arranged opposite to each other. The flush sides of the third section of the coil 1323 and the fourth section of the coil 1324 are arranged opposite to each other, and the stepped sides are arranged opposite to each other. Specifically, the first section of the coil 1321 is wound on one side close to the first end of the winding body 1310 as the flush side, and the other side is wound as the stepped side. The second section of the coil 1322 is wound on one side close to the first section of the coil 1321 as the stepped side, and the other side is wound as the flush side. The third section of the coil 1323 is wound on one side close to the second section of the coil 1322 as the flush side, and the other side is wound as the stepped side. The fourth section of the coil 1324 is wound on one side close to the third section of the coil 1323 as the stepped side, and the other side is wound as the flush side.

[0072] In this embodiment, the height of the n-shaped support block 1410 is equal to or slightly smaller than the ring width of the fixing ring 1420, and the height of the H-shaped support block 1410 is greater than the ring width of the fixing ring 1420, that is, the H-shaped support block 1420 has a stronger support effect on the coil. Therefore, the n-shaped or H-shaped support block 1410 can be selected according to the specific structure of the coil winding, so that the application of the support member 140 is more flexible, and the application range is wider. Specifically, when the stepped sides of the two adjacent sections of the coil are opposite to each other, since the winding width of the several layers of conductive wire in the two sections of the coil decreases from the inside to the outside along the radial direction of the high-voltage winding 130, the stepped side conductive wire of the two sections of the coil gradually moves away from the support member 140 from the inside to the outside, that is, the support member 140 only needs to support the conductive wire of the equal-width portion 1340. At this time, the n-shaped support block 1410 and the fixing ring 1420 are assembled to form the support member 140, which can meet the support requirements. When the flush sides of the two adjacent sections of the coil are opposite to each other, each layer of conductive wire of the two sections of the coil needs to be supported by the support member 140, that is, the support member 140 needs to support the conductive wire of the equal-width portion 1340 and the decreasing portion 1350 at the same time. At this time, the H-shaped support block 1410 with a greater height and the fixing ring 1420 are assembled to form the support member 140, which can meet the support requirements. The specific structure and number of the support block 1410 can be flexibly selected according to the structure of the high-voltage coil 1320, and the application range is wide.

[0073] In the embodiment, the support 140 between the first coil 1321 and the second coil 1322 is an n-shaped support block, the support 140 between the second coil and the third coil 1323 is an H-shaped support block, and the support 140 between the third coil 1323 and the fourth coil 1324 is an n-shaped support block. The n-shaped support block 1410 and the H-shaped support block 1410 are used in combination, which can fix the coils and prevent the displacement of the wires, and can reduce the amount of raw materials, thereby reducing the cost. In other embodiments, the n-shaped support block or the H-shaped support block can be randomly selected as long as the support block can fix the coils, and the present application is not limited in this regard.

[0074] In other embodiments, each coil can also not be provided with flush sides, that is, after the winding of the wires of the equal-width part is completed, the wires of the decreasing part are wound in the center of the upper layer of the equal-width part, that is, both sides of the decreasing part are stepped sides. At this time, the support blocks of each support can be selected as n-shaped support blocks.

[0075] The high-voltage insulation layer 1330 wraps the high-voltage coil 1320 and the winding body 1310 to form a high-voltage winding 130.

[0076] In an embodiment, the high-voltage insulation layer 1330 adopts high-temperature vulcanized silicone rubber and is formed by injection molding. The support 140 is first installed on the winding body 1310, and then the wires are wound on the winding body 1310 to form the high-voltage coil 1320. The support 140 can prevent the displacement of the high-voltage coil 1320 during injection. The support 140, the winding body 1310 and the high-voltage coil 1320 are taken as an injection body, the injection body is placed in a mold of an injection machine, and high-temperature vulcanized silicone rubber is integrally injection molded on the outer periphery of the injection body by adding silicone rubber raw materials, thereby obtaining the high-voltage winding 130. The high-voltage insulation layer 1330 adopts high-temperature vulcanized silicone rubber, which improves the insulation performance and mechanical properties of the high-voltage winding 130.

[0077] In the embodiment, the high-temperature vulcanized silicone rubber of the present application adopts a high-temperature vulcanized silicone rubber material system, which specifically includes raw rubber, reinforcing agent, flame retardant, heat-resistant agent and other auxiliary materials.

[0078] In another embodiment, the high-voltage insulation layer 1330 is formed by using liquid silicone rubber through a casting process or an injection process. When the casting process is used, the support 140 is first installed on the winding body 1310, and then the wire is wound on the winding body 1310 to form the high-voltage coil 1320. The support 140 can prevent the high-voltage coil 1320 from being displaced during casting. The support 140, the winding body 1310, and the high-voltage coil 1320 are taken as a body to be cast, and the body to be cast is placed in a casting mold. Liquid silicone rubber is added to the outer periphery of the body to be cast, and is cured to form the high-voltage winding 130. When the injection process is used, the specific molding process is similar to the foregoing injection process, and is not described again.

[0079] In the present application, the liquid silicone rubber uses a liquid silicone rubber material system, which specifically includes base glue, reinforcing agent, flame retardant, heat-resistant agent, and other auxiliary materials.

[0080] After the support 140, the high-voltage coil 1320, and the winding body 1310 are coated with high-temperature vulcanized silicone rubber or liquid silicone rubber under vacuum conditions, the high-temperature vulcanized silicone rubber or liquid silicone rubber fills the gaps between the support 140, the high-voltage coil 1320, and the winding body 1310, and wraps the two ends of the winding body 1310, without coating the inner wall of the winding body 1310. The high-voltage winding 130 as a whole has a hollow columnar shape, which can be a hollow circular cylinder, a hollow elliptical cylinder, or other hollow columnar bodies.

[0081] Compared with the epoxy resin high-voltage insulation layer in the prior art, the silicone rubber has the following advantages: 1) good fireproof performance, low-temperature resistance, aging resistance, and short-circuit resistance, which can prolong the service life of the dry-type transformer 10; 2) the copper coil is easy to peel off from the silicone rubber, and the material recovery rate is greater than 99%, which is more green and environmentally friendly; 3) the silicone rubber elastomer can reduce the partial discharge induced by mechanical vibration, has an inhibitory effect on equipment discharge, and the product of the silicone rubber under discharge is non-conductive silicon dioxide, which can effectively inhibit the continuous deterioration of insulation; 4) can reduce the operating loss of the dry-type transformer 10, and is more energy-saving; 5) has good resistance to harsh environments, and can be installed indoors and outdoors. At the same time, the high-voltage insulation layer 1330 is integrally formed by the injection process or the casting process, so that the high-voltage insulation layer 1330 is more stable, has higher mechanical properties, and has better adhesion to the high-voltage coil 1320 and the winding body 1310, which can effectively prolong the service life of the high-voltage insulation layer 1330.

[0082] The high-voltage winding of the present application has the beneficial effects that the support is arranged to abut and fix the high-voltage coil, which can effectively prevent the high-voltage coil from being displaced during transfer, transportation, mold assembly, and molding process, and ensures the quality of the high-voltage winding.

[0083] Meanwhile, the support member is formed by clamping the support block and the fixing ring, and has the advantages of simple and reliable structure, convenient processing, flexible installation, high operation efficiency, wide application range, and the like.

[0084] The technical content and technical features of the present application have been disclosed above, however, it can be understood that, under the creative thought of the present application, those skilled in the art can make various changes and improvements to the above structure and material, including the combination of the technical features disclosed or claimed herein alone, and obviously including other combinations of these features. These modifications and / or combinations all fall within the technical field involved by the present application, and fall within the protection scope of the claims of the present application.

Claims

1. A high-voltage winding, characterized in that, The high-voltage winding includes a winding body, a high-voltage coil, and a high-voltage insulation layer. The conductor is wound on the winding body to form the high-voltage coil. The high-voltage coil includes several coil segments. The high-voltage insulation layer wraps around the high-voltage coil and the winding body. A support member is provided between any two adjacent coil segments. The support member includes several support blocks and a fixing ring. The fixing ring is provided with several first slots. The support blocks are fixed to the fixing ring through the first slots.

2. The high-voltage winding as described in claim 1, characterized in that, The support block includes at least one hollow portion, and the support block is connected to the first slot through the hollow portion.

3. The high-voltage winding as described in claim 2, characterized in that, The sum of the groove depth of the first slot and the depth of the hollowed-out portion is equal to the ring width of the fixing ring.

4. The high-voltage winding as described in claim 2, characterized in that, The support block abuts against the outer peripheral surface of the winding body, and the top of the hollow part abuts against the bottom of the first slot.

5. The high-voltage winding as described in claim 2, characterized in that, The support block is n-shaped and includes one of the hollowed-out portions.

6. The high-voltage winding as described in claim 2, characterized in that, The support block is H-shaped and includes two hollowed-out sections.

7. The high-voltage winding as described in claim 1, characterized in that, The width of the support block matches the width of the first slot.

8. The high-voltage winding as described in claim 1, characterized in that, Several of the first slots are disposed on the outer periphery of the fixed ring and are evenly distributed along the circumference of the fixed ring.

9. The high-voltage winding as described in claim 1, characterized in that, The fixing ring is also provided with a plurality of second slots, which are arranged on the inner circumference of the fixing ring and evenly distributed along the circumference of the fixing ring.

10. The high-voltage winding as described in claim 1, characterized in that, The width of the support member is greater than or equal to the loop width of the coil.

11. The high-voltage winding as described in claim 1, characterized in that, The high-voltage insulation layer is made of high-temperature vulcanized silicone rubber or liquid silicone rubber.

12. A dry-type transformer, characterized in that, It includes an iron core, a low-voltage winding, and a high-voltage winding as described in any one of claims 1-11, wherein the low-voltage winding is sleeved outside the iron core, and the high-voltage winding is sleeved outside the low-voltage winding.

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