High-voltage winding and dry-type transformer

Abstract

The high-voltage winding comprises a winding body, a high-voltage coil and a high-voltage insulating layer, a wire is wound on the winding body to form the high-voltage coil, the high-voltage coil comprises a plurality of sections of coils, and the high-voltage insulating layer wraps the high-voltage coil and the winding body; a supporting piece is arranged between any two adjacent sections of coils and comprises a plurality of supporting blocks and a fixing ring, a plurality of first clamping grooves are formed in the fixing ring, and the supporting blocks are fixed to the fixing ring through the first clamping grooves. The high-voltage winding is provided with the supporting piece used for fixing the relative position of the coil, and the coil is prevented from displacing in the moving transportation, mold assembling and forming stages of the high-voltage winding. The utility model further discloses the dry-type transformer.

Description

Technical Field

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

[0002] At present, the layered coil high-voltage winding of the dry-type transformer needs to place spacers between adjacent coils to prevent the layered coils from shifting during transportation, mold assembly and molding. The placement and fixation of traditional spacers between layered coils is difficult, and there is a risk of displacement or even falling off. They need to be tied separately, which is cumbersome to operate. In addition, the size of the spacers needs to be customized according to the spacing between adjacent coils of high-voltage windings of different specifications, which is costly. In addition, during the molding stage of the high-voltage winding, the spacers are easily affected by the stress of the molding insulating medium and cause displacement, which in turn causes the coil to shift, affecting the quality of the high-voltage winding. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of the present application is to provide a high-voltage winding, in which a support member is arranged between any two adjacent coils. The support member has a simple and reliable structure, is convenient and flexible to install, can fully abut the high-voltage coil, and effectively avoids the coil displacement problem caused by displacement or even falling off of the support member, thereby ensuring the quality of the high-voltage winding.

[0004] To achieve the above purpose, the technical means adopted in this application are as follows: a high-voltage winding, the high-voltage winding includes a winding body, a high-voltage coil and a high-voltage insulation layer, the wire is wound on the winding body to form a high-voltage coil, the high-voltage coil includes a plurality of coil sections, and the high-voltage insulation layer wraps the high-voltage coil and the winding body; a support is provided between any two adjacent coil sections, the support includes a plurality of support blocks and a fixing ring, the fixing ring is provided with a plurality of first slots, and the support block is fixed to the fixing ring through the first slots. The support is used to abut the coil to prevent the high-voltage winding from shifting during transfer, transportation, mold assembly and molding.

[0005] Preferably, the support block includes at least one hollow portion, and the support block is connected to the first clamping groove through the hollow portion. The hollow portion can reduce the impact of the high-temperature vulcanized silicone rubber on the support member during injection, and prevent the support member from being damaged due to a large injection pressure; the hollow portion can also make the support block and the fixing ring more firmly fixed and not easy to fall off.

[0006] Preferably, the sum of the depth of the first clamping groove and the depth of the hollow portion is equal to the ring width of the fixing ring, so as to ensure that the support block can abut against the outer peripheral surface of the winding body.

[0007] Preferably, the support block abuts against the outer peripheral surface of the winding body, and the top of the hollow portion abuts against the bottom of the first slot, so as to prevent the innermost conductor of the coil from being displaced and ensure the supporting effect.

[0008] Preferably, the support block is n-shaped, and includes a hollow portion.

[0009] Preferably, the support block is H-shaped, and includes two hollow parts.

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

[0011] Preferably, the width of the support block matches the width of the first slot, so that the support block is tightly connected to the first slot and is not easy to loosen.

[0012] Preferably, a plurality of first clamping grooves are arranged on the outer circumference of the fixing ring and are evenly distributed along the circumference of the fixing ring, so that the support block can be conveniently fixed on the fixing ring.

[0013] Preferably, the fixing ring is also provided with a plurality of second clamping grooves, which are arranged on the inner circumference of the fixing ring and evenly distributed along the circumference of the fixing ring. The second clamping grooves are arranged to facilitate the flow of silicone rubber when injecting the high-voltage insulation layer.

[0014] Preferably, each coil section includes an equal width portion and a decreasing portion, and the decreasing portion gradually decreases in width from the inside to the outside along the radial direction of the winding body. In this way, as the outer layer of wire decreases, the insulation distance between the coils can be increased, thereby enhancing the insulation reliability of the high-voltage winding.

[0015] Preferably, one side of each coil is a flush side and the other side is a stepped side, and the flush sides of any two adjacent coils are arranged oppositely or the stepped sides are arranged oppositely. The stepped sides are arranged oppositely to increase the insulation distance, thereby enhancing the insulation reliability of the high-voltage winding.

[0016] Preferably, the width of the support is greater than or equal to the loop width of the coil, so that the support can better fix the coil and prevent the coil from being higher than the support, thereby causing the outer coil to be unrestricted by the support and thus displaced.

[0017] Preferably, the high-voltage insulation layer is high-temperature vulcanized silicone rubber, which improves the insulation performance and mechanical properties of the high-voltage winding as a whole.

[0018] The present application also provides a dry-type transformer, comprising an iron core, a low-voltage winding and a high-voltage winding, wherein the low-voltage winding is sleeved outside the iron core, and the high-voltage winding is sleeved outside the low-voltage winding.

[0019] The beneficial effect of the present application is that the high-voltage winding of the present application can effectively prevent the high-voltage coil from being displaced during transfer, transportation, mold assembly and molding by setting a support member to abut and fix the high-voltage coil, thereby ensuring the quality of the high-voltage winding.

[0020] At the same time, the support member of the present application is formed by clamping a support block and a fixed ring, has a simple and reliable structure, is easy to process, and is flexible to install. It does not require additional binding, has high operating efficiency, and the structure and quantity of the support member can be flexibly selected according to the structure of the high-voltage coil, and has a wide range of applications.

[0021] In addition, one side of each coil section of the present application is a flush side and the other side is a stepped side. The stepped sides of the two coil sections are arranged relative to each other to increase the insulation distance between the two sections, thereby effectively improving the insulation reliability of the high-voltage winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of a dry-type transformer 10 according to one embodiment of the present application;

[0023] Figure 2 is a top view of a dry-type transformer 10 according to an embodiment of the present application;

[0024] Figure 3 is a front view of an assembled core 110 according to an embodiment of the present application;

[0025] Figure 4 yes Figure 2 Enlarged view of G in the middle;

[0026] Figure 5 It is a three-dimensional schematic diagram of a high-voltage coil 1320 wound on a winding body 1310 according to an embodiment of the present application;

[0027] Figure 6 is a schematic circuit diagram of a high voltage coil 1320 according to an embodiment of the present application;

[0028] Figure 7 is a three-dimensional schematic diagram of a high-voltage winding 130 according to an embodiment of the present application;

[0029] Figure 8 is a three-dimensional schematic diagram of several support members 140 according to an embodiment of the present application;

[0030] Fig. 9 is a three-dimensional schematic diagram of a fixing ring 1420 according to an embodiment of the present application;

[0031] Fig.10 is a three-dimensional schematic diagram of a support block 1410 according to an embodiment of the present application;

[0032] Fig.11 It is a three-dimensional schematic diagram of a support block 1410 according to another embodiment of the present application. DETAILED DESCRIPTION

[0033] Upon request, specific embodiments 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 may be embodied in various forms. Therefore, the specific details disclosed herein are not considered to be restrictive, but only as a basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application in various ways in practice in any appropriate manner, including using the various features disclosed herein and combining features that may not be explicitly disclosed herein.

[0034] like Figure 1-Figure 3 As shown, the dry-type transformer 10 is a three-phase transformer, which is respectively A phase, B phase and C phase, that is, the dry-type transformer 10 includes three single-phase transformers 100. According to the different structures of the iron core 110, the three transformers 100 can be arranged to form a linear or triangular structure, and the three transformers 100 are symmetrical. In addition, the dry-type transformer 10 can also be an isolation transformer, a frequency conversion transformer, a test transformer, etc.

[0035] In one embodiment, three transformers 100 are arranged to form a linear structure, and the dry-type transformer 10 includes an iron core 110, three low-voltage windings 120, and three high-voltage windings 130. The iron core 110 includes three columnar iron core bodies 111, an upper iron yoke 112 located at the upper ends of the three columnar iron core bodies 111, and a lower iron yoke 113 located at the lower ends of the three columnar iron core bodies 111. The three low-voltage windings 120 are respectively sleeved on the outer peripheries of the three columnar iron core bodies 111, and the three high-voltage windings 130 are respectively sleeved on the outer peripheries of the three low-voltage windings 120, that is, the three columnar iron core bodies 111, the three low-voltage windings 120, and the three high-voltage windings 130 are sleeved one by one from the inside to the outside. The columnar iron core 111 is formed by stacking multiple layers of silicon steel sheets, which are tied and fixed with cable ties. The radial cross-section of the columnar iron core 111 is roughly elliptical or circular or other shapes, as long as it can be accommodated in the hollow cavity of the low-voltage winding 120. There is no limitation here. The upper iron yoke 112 and the lower iron yoke 113 are also formed by stacking multiple layers of silicon steel sheets, so that the three columnar iron cores 111 are fixedly connected, thereby forming a Figure 3 A three-phase core 110 is shown.

[0036] The core 110 is provided with a core clamp 150 on the outside thereof, and the core clamp 150 is used to clamp the core 110. The core clamp 150 may be a channel steel member or a hollow tube member, which is not limited here. Four core clamps 150 are provided, of which two core clamps 150 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 core clamps 150 are symmetrically located on both sides of the lower end of the core 110 and below the high-voltage winding 130.

[0037] Combination Figure 2 and Figure 4As shown, the low-voltage winding 120 includes a copper foil 121, a low-voltage insulating layer 122 and a support bar 123, and the copper foil 121 and the low-voltage insulating layer 122 are arranged alternately. The copper foil 121 is formed by winding a whole copper foil, and the low-voltage insulating layer 122 and the copper foil 121 are overlapped and wound together. At least one heat dissipation air channel is provided in the low-voltage winding 120, and the heat dissipation air channel is located between adjacent copper foils 121 and low-voltage insulating layers 122, and the support bar 123 is located in the heat dissipation air channel, which is used to support and isolate the adjacent copper foils 121 and low-voltage insulating layers 122.

[0038] The low-voltage insulation layer 122 uses polyimide impregnated paper, which can be specifically SHS-P diphenyl ether prepreg material, which is made of a soft composite material of polyimide film and polysulfone fiber non-woven fabric impregnated with diphenyl ether resin and then baked. Of course, the low-voltage insulation layer can also use DMD insulation paper or silicone rubber film, or other insulation materials, which can be selected according to the different insulation and heat resistance grades of dry-type transformers.

[0039] The insulating support bar 123 is made of glass fiber impregnated with epoxy resin, or aramid fiber impregnated with epoxy resin, which is not limited here. In addition, the insulating support bar 123 is a long strip with an I-shaped cross section, which has a more stable mechanical strength. Of course, the insulating support bar 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.

[0040] like Figure 5-Figure 7 As shown, the high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320 and a high-voltage insulation layer 1330. The wire is wound on the winding body 1310 to form the high-voltage coil 1320. The high-voltage coil 1320 includes a plurality of coil segments. 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, and the winding body 1310 is a hollow cylinder, which can be a hollow 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.

[0041] Among them, the winding body 1310 is a hollow tube formed by glass fiber impregnated with epoxy resin, winding and curing or pultrusion, or it can be a hollow tube formed by glass fiber or aramid fiber impregnated with epoxy resin, pultrusion and winding, or it can be a hollow tube formed by aramid fiber impregnated with epoxy resin, winding and curing or pultrusion, or it can be made of other composite materials, which is not limited here.

[0042] Taking the A-phase transformer 100 as an example, the wire is circumferentially wound on the outer peripheral surface of the winding body 1310 to form a high-voltage coil 1320. Specifically, the high-voltage coil 1320 is spaced apart in the axial direction of the winding body 1310, and the wire forms two outlets at the head and tail ends after winding, namely, a first outlet D and a second outlet X. The wire leads to six taps in the middle of the winding body 1310 along the axial direction, namely, tap 2, tap 3, tap 4, tap 5, tap 6 and tap 7, and the six taps are used to connect the tap changer.

[0043] In one application scenario, the high-voltage coil 1320 includes four sections of coils, namely the first section of coil 1321, the second section of coil 1322, the third section of coil 1323 and the fourth section of coil 1324. Among them, the wire is a continuous wire, and the outside of the wire is coated with an insulating layer. The insulating layer can be coated by film wrapping, enamel wrapping, silk wrapping and other coating methods; the insulating layer can be a polyimide film or a glass fiber film, or the insulating layer can be other insulating materials such as polyester paint, or a combination of multiple insulating materials can be used, as long as the heat resistance level of the high-voltage winding 130 is met, and there is no limitation here. Furthermore, along the axial direction of the winding body 1310, the extended length of each section of the high-voltage coil 1320 is defined as the width of the coil.

[0044] Furthermore, if Figure 8-Figure 11As shown, in order to make the wire winding more stable, the high-voltage winding 130 also includes a plurality of support members 140. A support member 140 is provided between any two adjacent coils of the high-voltage coil 1320. Each support member 140 includes 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 docking and combining two symmetrical semi-annular components of the same shape and size. The surfaces of the two semi-annular components docking with each other are smooth, so that there is no obvious step or protrusion at the docking point of the fixing ring 1420, ensuring that the fixing ring 1420 is uniformly stressed and avoiding local stress concentration. Each semi-annular component is provided with at least one binding hole 1423 at the docking edges at both ends thereof. When the fixing ring 1420 is assembled, a binding belt is used to pass through the corresponding binding holes 1423 on the two semi-annular components and fix the two semi-annular components together, thereby forming a complete fixing ring 1420, so that the stability and reliability of the fixing ring 1420 during use can be ensured. For example, if the high-voltage winding 130 is a hollow elliptical cylinder as a whole, the fixing ring 1420 is an elliptical ring, which is formed by the docking and combination of two semi-elliptical ring components; for another example, if the high-voltage winding 130 is a hollow cylindrical body as a whole, the fixing ring 1420 is a circular ring, which is formed by the docking and combination of two semi-circular ring components. A plurality of first slots 1421 are provided on the fixing ring 1420, and a plurality of support blocks 1410 are fixed on the fixing ring 1420 through a plurality of first slots 1421 respectively. The support member 140 is formed by the clamping of the support block 1410 and the fixing ring 1420, which has a simple and reliable structure, convenient processing, flexible installation, and no need for additional binding, and has high operating efficiency. A plurality of support members 140 cooperate with each other to effectively abut and fix the various sections of the high-voltage coil 1320, so as to avoid displacement of the high-voltage coil 1320 during the transfer, transportation, mold assembly and molding stages, thereby affecting the quality of the high-voltage winding 130.

[0045] The number of coils of the high-voltage coil 1320 is specifically determined according to the voltage level of the high-voltage winding 130. The higher the voltage level, the more coils there are. In this embodiment, considering the voltage level and manufacturing cost of the high-voltage winding 130, the high-voltage coil 1320 is configured to include four coils, and correspondingly, three support members 140 are configured. In other embodiments, the number of support members can be adjusted according to the number of coils of the high-voltage coil, and no specific limitation is made here.

[0046] The inner diameter of the fixing ring 1420 matches 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 at intervals along the axial direction of the winding body 1310, so that a 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 grooves 1421 are arranged on the outer circumference of the fixing ring 1420 and are evenly distributed along the circumference of the fixing ring 1420, so that the support block 1410 can be conveniently fixed on the fixing ring 1420. The distance between the two opposite side surfaces of the first groove 1421 along the circumference of the fixing ring 1420 is defined as the groove width of the first groove 1421.

[0047] The fixing ring 1420 is also provided with a plurality of second slots 1422, which are arranged on the inner circumference of the fixing ring 1420 and evenly distributed along the circumference of the fixing ring 1420. The distance between the two opposite sides of the second slot 1422 along the circumference of the fixing ring 1420 is defined as the slot width of the second slot 1422. In this embodiment, the slot width of the second slot 1422 is greater than the slot width of the first slot 1421. The second slot 1422 is provided to facilitate the flow of silicone rubber when injecting the high-voltage insulation layer 1330, and to avoid the displacement of the fixing ring 1420 due to the large injection pressure, thereby causing the coil to deviate and affect the quality of the high-voltage winding 130; the second slot 1422 is also provided to facilitate the connection of the wires between adjacent coil segments after the winding is completed, that is, the wire of one coil segment is connected to the wire of another adjacent coil segment through the second slot 1422. In other embodiments, the slot width of the second slot can also be adjusted according to the wire specifications, as long as it can facilitate the flow of silicone rubber during injection, and is not limited here. It can be understood that the positions of the second slots 1422 and the first slots 1421 on the fixed ring 1420 can correspond to each other, for example, each second slot 1422 and each first slot 1421 are respectively arranged on the inner circumference and outer circumference of the fixed ring 1420; or, the positions of the second slots 1422 and the first slots 1421 on the fixed ring 1420 can also be arranged in a non-corresponding manner, for example, each second slot 1422 and each first slot 1421 are staggered on the inner circumference and outer circumference of the fixed ring 1420. As long as the settings of the second slots 1422 and the first slots 1421 meet the structural strength requirements of the fixed ring 1420, no specific restrictions are made here.

[0048] The support block 1410 includes at least one hollow portion 1411, and the support block 1410 is connected to the first clamping groove 1421 of the fixing ring 1420 through the hollow portion 1411. The hollow portion 1411 can facilitate the flow of silicone rubber during injection, reduce the impact of high-temperature vulcanized silicone rubber on the support member 140 during injection, and avoid damage to the support member 140 due to a large injection pressure, which affects the winding quality; the hollow portion 1411 can also make the clamping connection between the support block 1410 and the fixing ring 1420 more stable and not easy to fall off.

[0049] For the convenience of description, when the support member 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 slot 1421, so that the support block 1410 is tightly connected when it is inserted into the first slot 1421 and is not easy to loosen, thereby preventing the high-voltage coil 1320 from being displaced during the transfer, transportation, mold assembly and molding stages, and effectively ensuring the distance between the segments of the high-voltage coil 1320. If the width of the first slot 1421 is greater than the width of the support block 1410, there is a gap between the fixing ring 1420 and the support block 1410. During the wire winding process and the injection process of the high-voltage insulation layer 1330, the support block 1410 is easy to loosen on the fixing ring 1420 and cannot play the role of fixing the coil, thereby causing the high-voltage coil 1320 to move, affecting the quality of the high-voltage winding 130; if the width of the first slot 1421 is less than the width of the support block 1410, the support block 1410 cannot be inserted into the first slot 1421, and cannot play the role of fixing the coil. The thickness of the support block 1410 can be designed according to the distance between two adjacent sections 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 it supports, and no specific restrictions are made here.

[0050] The distance from one end of the hollow portion 1411 to the other end thereof along the radial direction of the winding body 1310 is defined as the depth of the hollow portion 1411, and the depth of the first slot 1421 along the radial direction of the winding body 1310 is defined as the groove depth of the first slot 1421. The sum of the groove depth of the first slot 1421 and the depth of the hollow portion 1411 is equal to the ring width of the fixing ring 1420. In this way, when the support member 140 is installed on the outer periphery of the winding body 1310, the support block 1410 can abut the outer peripheral surface of the winding body 1310, thereby preventing the innermost layer of the coil wire from being displaced, thereby ensuring the supporting effect.

[0051] In one embodiment, see Fig.10, the support block 1410 may be an n-type block structure, and in this case, the support block 1410 includes a hollow portion 1411. In another embodiment, see Fig.11 The support block 1410 may also be an H-shaped block structure, in which case the support block 1410 includes two identical hollow portions 1411. The specific sizes of the H-shaped support block 1410 and the n-shaped support block 1410 may be adjusted according to the use requirements, as described above, and will not be repeated.

[0052] During installation, the hollow portion 1411 of the support block 1410 is clamped on the outer side of the fixing ring 1420 through the first clamping groove 1421, and the two side plates of the fixing ring 1420 are clamped on both sides of the hollow portion 1411 on the support block 1410, that is, the hollow portion 1411 of the support block 1410 of the n-type structure is clamped in the first clamping groove 1421, or any hollow portion 1411 of the support block 1410 of the H-type structure is clamped in the first clamping groove 1421, so that the support block 1410 abuts against the outer peripheral surface of the winding body 1310, and the top of the hollow portion 1411 abuts against the bottom of the first clamping groove 1421, ensuring that the support block 1410 is tightly connected to the fixing ring 1420; a plurality of support blocks 1410 are respectively installed in a plurality of first clamping grooves 1421 on the fixing ring 1420 in the above manner, and the assembly of the support member 140 can be completed. The assembly process of the support member 140 is simple to operate and highly efficient.

[0053] The support block 1410 and the fixing ring 1420 are both made of insulating high-temperature resistant materials, such as glass fiber reinforced epoxy resin composite boards, glass fiber reinforced polyimide composite boards, etc., and are processed and formed by milling technology. The above materials have good high-temperature resistance and electrical insulation properties, and the process is simple and the processing cycle is short.

[0054] The contact surface of the support block 1410 and the fixing ring 1420 can 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, and no additional binding is required, which improves the working efficiency and can withstand the high temperature when injecting the high voltage insulation layer 1330. The setting of the support member 140 can ensure the distance between the segments of the coil when it is erected and molded, thereby ensuring the insulation performance of the high voltage winding 130.

[0055] When the support member 140 is mounted on the winding body 1310, the distance from the end of the support member 140 farthest from the winding body 1310 to the end of the support member 140 closest to the winding body 1310 along the radial direction of the winding body 1310 is defined as the width of the support member 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 member 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 member 140 is also equal to it; when the height of the support block 1410 is greater than the ring width of the fixing ring 1420, the width of the support member 140 is equal to the height of the support block 1410. Along the radial direction of the winding body 1310, the distance from the outer side of the outermost layer of the wire of the high-voltage coil 1320 to the outer peripheral surface of the winding body 1310 is defined as the ring width of the coil, and the width of the support member 140 is greater than or equal to the ring width of the coil. In this way, in the radial direction of the winding body 1310, the support member 140 can abut against the side wall of the entire high-voltage coil 1320, which can better fix the coil and prevent the outer layer of the wire of the coil from being supported by the support member 140 when the ring width of the coil is greater than the width of the support member 140, thereby causing the coil to be displaced and affecting the quality of the high-voltage winding 130.

[0056] In one application scenario, along the axial direction of the winding body 1310 , the width of each coil segment of the high-voltage coil 1320 is uniform, that is, both sides of each coil segment are flush.

[0057] Continue reading Figure 5-Figure 7 Before winding the wire, the position of each coil segment is pre-marked on the winding body 1310, that is, the width of each coil segment and the distance between each coil segment are marked, and then the support member 140 is installed on the winding body 1310 so that each support member 140 is located in the inter-segment area of ​​each coil segment.

[0058] For the convenience of expression, 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. Thus, from the first end to the second end of the winding body 1310, the high-voltage coil 1320 includes a first coil segment 1321, a second coil segment 1322, a third coil segment 1323, and a fourth coil segment 1324 in sequence.

[0059] The four coils are all layered structures, and interlayer insulation materials are placed between the layers of each coil to reduce the voltage difference between each coil. At this time, each coil is provided with interlayer insulation materials along the axial direction of the high-voltage winding 130, that is, the axial direction of the winding body 1310, to prevent the interlayer electric field strength from being higher than the tolerance critical value of the insulating film coated with the insulated wire; and the layered structure in each coil has good lightning impact resistance, and the economic advantage is more obvious. Among them, the interlayer insulation material can be silicone cloth, glass fiber mesh cloth, electrical composite material, etc.; the interlayer insulation material can be set to one layer, two layers or three layers, depending on different design conditions, and is not limited here.

[0060] Specifically, when winding the wire, one wire is used to wind the fourth coil 1324, that is, in the marked area of ​​the fourth coil 1324 on the winding body 1310, the wire is wound from the first end of the winding body 1310 to the second end until the wire is wound to the marked width and tied to form the first layer of the wire of the fourth coil 1324; then the interlayer insulation material is placed on the first layer of the wire; then the wire is wound in a "Z" shape on the interlayer insulation material to perform layer-up winding, that is, the wire is pulled back to the original position where the first layer of the wire is wound and then wound above the first layer of the wire, tied after winding to the marked width, and covered with interlayer insulation material again; this operation is repeated until the fourth coil 1324 is wound. The outer turn wire end (i.e., the end of the wire) of the fourth coil 1324 located at the second end of the winding body 1310 forms a second outlet terminal X exposed outside the high-voltage insulation layer 1330. For ease of expression, the inner turn wire end of each coil segment, i.e., the end where the wire starts to be wound, is defined as the wire head end, and the outer turn wire end of each coil segment, i.e., the end where the wire is wound, is defined as the wire end.

[0061] Another wire is used to wind the second coil 1322. In the marked area of ​​the second coil 1322 on the winding body 1310, the wire is wound from the first end to the second end of the winding body 1310 as a whole according to the above method. No further description is given here. The difference is that during the winding process of the second coil 1322, the wire needs to be led out to three taps through lead wires, that is, Figure 6 The tap 6, tap 4 and tap 2 are shown. The lead wire can be led out by the double-folding method, that is, during the coil winding, the lead wire is folded outward to a certain length at the tap position to form the lead wire, and the outer periphery of the lead wire is covered with an insulating layer, and then the second section of the coil 1322 is continued to be wound; or the lead wire can also be led out by the welding wire method, that is, during the coil winding, the lead wire is welded at the tap position, and the welding position and the outer periphery of the lead wire are covered with an insulating layer, and then the second section of the coil 1322 is continued to be wound.

[0062] After the fourth coil 1324 and the second coil 1322 are wound, the winding body 1310 is reversed head to tail so that the first end and the second end of the winding body 1310 are swapped, and then the first coil 1321 and the third coil 1323 are wound.

[0063] Before the first coil 1321 is wound, the lead end of the wire of the second coil 1322 is led out through one of the second slots 1422 on the adjacent fixing ring 1420 and welded to the lead end of the wire of the first coil 1321. After the welding point is covered with an insulating layer, the wire of the first coil 1321 is wound from the second end to the first end of the winding body 1310 in a "Z" shape. Similar to the fourth coil 1324, the outer turn wire end (i.e., the end of the wire) of the first coil 1321 located at the first end of the winding body 1310 forms a first output terminal D exposed outside the high-voltage insulation layer 1330.

[0064] Before the third coil 1323 is wound, the lead end of the wire of the fourth coil 1324 is led out through one of the second slots 1422 on the adjacent fixing ring 1420 and welded to the lead end of the wire of the third coil 1323. After the welding part is covered with an insulating layer, the wire of the third coil 1323 is wound from the second end to the first end of the winding body 1310 in a "Z" shape. Similar to the second coil 1322, the wire is also led out to three taps through lead wires, that is, Figure 6 The tap 3, tap 5, and tap 7 are shown. At this point, the winding of the high-voltage coil 1320 is completed. Each coil formed by winding the wire is perpendicular to the axial direction of the winding body 1310, the winding is convenient, the wires are arranged neatly, and the mechanical strength is good.

[0065] By winding four sections of coils in the above manner, on the one hand, the wire connection between adjacent sections of coils can be made simpler and faster, that is, the distance between the wire head end of the first section coil 1321 and the wire head end of the second section coil 1322, the wire head end of the third section coil 1323 and the wire head end of the fourth section coil 1324 is relatively close, which is convenient for welding; on the other hand, it is also convenient to lead out the output end of the high-voltage winding 130, that is, the wire end of the first section coil 1321 is located at the first end of the winding body 1310, and the wire end of the fourth section coil 1324 is located at the second end of the winding body 1310, and then the first output end D and the second output end X can be directly led out respectively; in addition, compared with the winding method of winding all four sections of coils from the first end to the second end of the winding body 1310, no additional oblique wire is required to connect the two adjacent sections of coils, and there is no need to lead out the wire head end from the inner turn of the wire as the output end of the winding body 1310, which can effectively save the amount of wire and reduce the cost while facilitating the connection and output of the wire.

[0066] In another application scenario, combined with Figure 5 Each coil section includes an equal-width portion 1340 and a decreasing portion 1350. The equal-width portion 1340 includes a first-layer conductor and several layers of conductors with the same number of turns as the first-layer conductor wound around the periphery of the first-layer conductor, that is, the winding widths of the several layers of conductors in the equal-width portion 1340 are equal, which is the winding width of the first-layer conductor; the decreasing portion 1350 includes several layers of conductors wound around the equal-width portion 1340 with fewer turns than the first-layer conductor. The decreasing portion 1350 includes several layers of conductive wires with different winding widths. The width of the coils of the decreasing portion 1350 gradually decreases from the inside to the outside along the radial direction of the winding body 1310. Each decreasing group of coils of the decreasing portion 1350 is wound with a preset number of layers so that it has a preset thickness. In this embodiment, the decreasing portion 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 are arranged from the inside to the outside along the radial direction of the winding body 1310, namely, an equal-width portion 1340, a first decreasing group 1351, a second decreasing group 1352, a third decreasing group 1353 and a fourth decreasing group 1354. The winding width of several layers of wires in each coil section remains unchanged from the inside to the outside along the radial direction of the winding body 1310 to form an equal-width portion 1340, and then gradually decreases to form a decreasing portion 1350, that is, the innermost layer has the most wires and the outermost layer has the least wires. In this way, as the outer layer of wires decreases, the insulation distance between the coils can be increased, thereby enhancing the insulation reliability of the high-voltage winding 130.

[0067] When the wire of the equal-width portion 1340 is wound, after the first layer of wire is wound according to the width of the marked area, the number of turns of the wire is full turns N0, and then several layers of wire are wound around the first layer of wire according to the full turns N0 until the winding of the equal-width portion 1340 is completed.

[0068] When the wire of the decreasing part 1350 is wound, the first decreasing group 1351, the second decreasing group 1352, the third decreasing group 1353 and the fourth decreasing group 1354 are wound in sequence on the outermost wire of the equal width part 1340. Among them, the first decreasing group 1351 includes several layers of wires with equal widths, and the number of winding turns of the wires is N1, N1=N0-M, where M is a positive integer, and N0>4M; the second decreasing group 1352 includes several layers of wires with equal widths, and the number of winding turns of the wires is N2, N2=N0-2M; the third decreasing group 1353 includes several layers of wires with equal widths, and the number of winding turns of the wires is N3, N3=N0-3M; the fourth decreasing group 1354 includes several layers of wires with equal widths, and the number of winding turns of the wires is N4, N4=N0-4M. In other embodiments, the decreasing portion may include two, three, five or more decreasing groups, and the number of full turns N0 may be adjusted according to the size of M and the number of decreasing groups, which is not specifically limited herein.

[0069] Furthermore, when the coil is wound, one side of each coil is a flush side and the other side is a stepped side. The wire on the flush side is wound against the support member 140. Since the decreasing portion 1350 includes a plurality of layers of wires with different widths, the other side of the coil forms a stepped side. The flush sides or stepped sides of any two adjacent coils are arranged opposite to each other. Thus, on the stepped sides of the adjacent coils arranged opposite to each other, as the outer wires of the two coils are reduced, the insulation distance between the two adjacent coils is greatly increased, thereby greatly enhancing the insulation reliability of the high-voltage winding 130. In this embodiment, the flush sides of the first coil segment 1321 and the second coil segment 1322 are arranged back to back, and the stepped sides are arranged opposite to each other; the flush sides of the third coil segment 1323 and the fourth coil segment 1324 are arranged back to back, and the stepped sides are arranged opposite to each other. Specifically, one side of the first coil segment 1321 close to the first end of the winding body 1310 is wound into a flush side, and the other side is wound into a stepped side; one side of the second coil segment 1322 close to the first coil segment 1321 is wound into a stepped side, and the other side is wound into a flush side; one side of the third coil segment 1323 close to the second coil segment 1322 is wound into a flush side, and the other side is wound into a step side; one side of the fourth coil segment 1324 close to the third coil segment 1323 is wound into a stepped side, and the other side is wound into a flush side.

[0070] In this embodiment, the height of the n-type support block 1410 is equal to or slightly less than the ring width of the fixed ring 1420, and the height of the H-type support block 1410 is greater than the ring width of the fixed ring 1420, that is, the H-type support block 1420 has a stronger supporting effect on the coil. Therefore, the support block 1410 can be selected as n-type or H-type according to the specific structure of the coil winding, so that the application of the support member 140 is more flexible and has a wider range of applications. Specifically, when the step sides of two adjacent coils are opposite, since the winding width of several layers of wires in the two coils decreases from the inside to the outside along the radial direction of the high-voltage winding 130, the step side wires of the two coils gradually move away from the support member 140 from the inside to the outside, that is, the support member 140 only needs to support the wires of the equal width portion 1340. At this time, the n-type support block 1410 and the fixed ring 1420 are selected to assemble and form the support member 140 to meet the support requirements. When the flush sides of two adjacent coils are opposite, each layer of the wires of the two coils needs to be supported by the support member 140, that is, the support member 140 needs to support the wires of the equal width portion 1340 and the decreasing portion 1350 at the same time. At this time, the support member 140 can meet the support requirements by selecting a higher H-shaped support block 1410 and a fixing ring 1420 to be assembled. 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 has a wide range of applications.

[0071] In this embodiment, the support member 140 between the first coil segment 1321 and the second coil segment 1322 is an n-type support block, the support member 140 between the second coil segment 1323 and the third coil segment 1323 is an H-type support block, and the support member 140 between the third coil segment 1323 and the fourth coil segment 1324 is an n-type support block. The n-type support block 1410 and the H-type support block 1410 are used together to fix the coil and prevent the displacement of the wire, and can also reduce the amount of raw materials, thereby reducing costs. In other embodiments, the n-type support block or the H-type support block can also be randomly selected, as long as the support member can fix the coil, and there is no limitation here.

[0072] In other embodiments, each coil segment may not be provided with a flush side, that is, after the wire of the equal width portion is wound, the wire of the decreasing portion is wound in the center of the upper layer of the equal width portion, that is, both sides of the decreasing portion are stepped sides. In this case, the support blocks of each support member can use n-type support blocks.

[0073] The high-voltage winding 130 is formed after the high-voltage insulation layer 1330 wraps the high-voltage coil 1320 and the winding body 1310. The high-voltage insulation layer 1330 is a high-temperature vulcanized silicone rubber. 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 displacement during injection. The support 140, the winding body 1310 and the high-voltage coil 1320 are used as the body to be injected, and the body to be injected is placed in the mold of the injection machine. By adding silicone rubber raw materials, high-temperature vulcanized silicone rubber is integrally injection-molded on the periphery of the body to be injected to obtain the high-voltage winding 130. The high-voltage insulation layer 1330 uses high-temperature vulcanized silicone rubber, which improves the insulation performance and mechanical properties of the high-voltage winding 130 as a whole.

[0074] Among them, the high temperature vulcanized silicone rubber of the present application adopts a high temperature vulcanized silicone rubber material system, which specifically includes raw rubber, a reinforcing agent, a flame retardant, a heat-resistant agent and other auxiliary materials.

[0075] After the support 140, the high-voltage coil 1320 and the winding body 1310 are covered with the high-temperature vulcanized silicone rubber by overall vacuum injection, the high-temperature vulcanized 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, and the high-temperature vulcanized silicone rubber does not cover the inner wall of the winding body 1310, so that the high-voltage winding 130 is hollow cylindrical as a whole, which can be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylindrical bodies.

[0076] Compared with the epoxy resin high-voltage insulation layer in the prior art, silicone rubber has the following advantages: 1) It has good fire resistance, low temperature resistance, aging resistance and short-circuit test resistance, which can extend 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 recyclability is greater than 99%, which is more environmentally friendly; 3) The silicone rubber elastomer can reduce the local discharge inducement caused by mechanical vibration, and has an inhibitory effect on the discharge of the equipment. The product of silicone rubber under the discharge is non-conductive silicon dioxide, which can effectively inhibit the continued degradation of insulation; 4) It can reduce the operating loss of the dry-type transformer 10 and save energy; 5) It has good resistance to harsh environments and can be installed indoors and outdoors. At the same time, the high-voltage insulation layer 1330 is injected through overall high-temperature vulcanization. Compared with the existing room temperature vulcanization, this process method makes the high-voltage insulation layer 1330 more stable, with higher mechanical properties, and better bonding performance with the high-voltage coil 1320 and the winding body 1310, which can effectively extend the service life of the high-voltage insulation layer 1330. Furthermore, compared with liquid silicone rubber, the high temperature vulcanized silicone rubber filler is evenly dispersed, and will not cause partial discharge in the dry-type transformer 10 due to filler agglomeration, thereby improving the overall performance of the dry-type transformer 10.

[0077] The beneficial effect of the present application is that the high-voltage winding of the present application can effectively prevent the high-voltage coil from being displaced during transfer, transportation, mold assembly and molding by setting a support member to abut and fix the high-voltage coil, thereby ensuring the quality of the high-voltage winding.

[0078] At the same time, the support member of the present application is formed by clamping a support block and a fixed ring, with a simple and reliable structure, convenient processing, flexible installation, and no additional binding is required between the support block and the fixed ring, so the operation efficiency is high, and the structure and quantity of the support member can be flexibly selected according to the structure of the high-voltage coil, and the application range is wide.

[0079] In addition, one side of each coil section of the present application is a flush side and the other side is a stepped side. The stepped sides of the two coil sections are arranged relative to each other to increase the insulation distance between the two sections, thereby effectively improving the insulation reliability of the high-voltage winding.

[0080] The technical content and technical features of the present application have been disclosed above. However, it is understood that, under the creative concept of the present application, those skilled in the art can make various changes and improvements to the above structures and materials, including combinations of technical features disclosed or claimed separately herein, and obviously including other combinations of these features. These variations and / or combinations all fall within the technical field involved in 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 comprises a winding body, a high-voltage coil and a high-voltage insulation 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. The high-voltage insulation layer wraps the high-voltage coil and the winding body. A support member is provided between any two adjacent coils. The support member includes a plurality of support blocks and a fixing ring. The fixing ring is provided with a plurality of first slots. The support blocks are fixed to the fixing ring through the first slots.

2. The high voltage winding according to claim 1, characterized in that: The support block includes at least one hollow portion, and the support block is connected to the first clamping slot via the hollow portion.

3. The high voltage winding according to claim 2, characterized in that: The sum of the groove depth of the first clamping groove and the depth of the hollow portion is equal to the ring width of the fixing ring.

4. The high voltage winding according to claim 2, characterized in that: The support block abuts against the outer peripheral surface of the winding body, and the top of the hollow portion abuts against the bottom of the first slot.

5. The high voltage winding according to claim 2, characterized in that: The support block is n-shaped and includes a hollow portion.

6. The high voltage winding according to claim 2, characterized in that: The support block is H-shaped and includes two hollow parts.

7. The high voltage winding according to claim 1, characterized in that: The width of the supporting block matches the width of the first card slot.

8. The high voltage winding according to claim 1, characterized in that: A plurality of the first clamping grooves are arranged on the outer circumference of the fixing ring and are evenly distributed along the circumference of the fixing ring.

9. The high voltage winding according to claim 1, characterized in that: The fixing ring is also provided with a plurality of second clamping grooves, which are arranged on the inner circumference of the fixing ring and are evenly distributed along the circumference of the fixing ring.

10. The high voltage winding according to claim 1, characterized in that: Each section of the coil comprises a portion of equal width and a decreasing portion, and the width of the decreasing portion along the radial direction of the winding body gradually decreases from the inside to the outside.

11. The high voltage winding according to claim 10, characterized in that: One side of each section of the coil is a flush side, and the other side is 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.

12. The high voltage winding according to claim 1, characterized in that: The width of the support member is greater than or equal to the loop width of the coil.

13. The high voltage winding according to claim 1, characterized in that: The high voltage insulation layer is high temperature vulcanized silicone rubber.

14. A dry-type transformer, characterized in that: It comprises an iron core, a low voltage winding and a high voltage winding as claimed in any one of claims 1 to 13, 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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