Winding body of high-voltage winding and high-voltage winding

Abstract

The winding body comprises a plurality of winding plates and a plurality of auxiliary parts, the auxiliary parts are annular and are arranged at intervals in the axial direction of the winding body, the length directions of the winding plates are arranged in the axial direction of the winding body, the winding plates are evenly distributed in the circumferential direction of the winding body, and the winding plates are connected to the inner peripheries of the auxiliary parts in a clamped mode. And bulges are correspondingly arranged on at least one group of winding plates. The invention further discloses the high-voltage winding. The protrusions are arranged on the wire winding plate to abut against the inner wall of the mold, the wire winding plate can be effectively prevented from loosening and shifting, and the injection quality of the high-voltage insulating layer is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of power transformers, and in particular to a winding body of a high-voltage winding and a high-voltage winding. Background Art

[0002] At present, transformers can be divided into: oil-immersed transformers, dry-type transformers, and gas transformers. Dry-type transformers have the advantages of being oil-free, fireproof, long life, energy-saving and low noise, simple maintenance, safe and reliable. Most of the dry-type transformers on the market are resin-cast high-voltage winding dry-type transformers and open dry-type transformers. Although dry-type transformers have made great progress in the past 10 years, there are still problems such as insulation cracking, poor thermal conductivity, and harsh operating environment in operation.

[0003] The winding structure of the high-voltage winding of the current dry-type transformer is usually formed by clamping a rigid comb plate and an annular support strip. A number of comb plates are circumferentially clamped on the outer circumference of the annular support strips arranged at intervals to form a winding skeleton, which is then put on a winding tooling and wound with wires to form a high-voltage coil, and then placed in an injection mold to form a high-voltage winding by high-temperature injection of silicone rubber. However, the large injection pressure will have an impact on the winding body, which can easily cause the position of the winding body in the injection mold to shift, thereby resulting in uneven thickness of the injected high-voltage insulation layer, affecting the quality of the high-voltage winding. Summary of the invention

[0004] In view of the shortcomings of the prior art, one of the purposes of the present application is to provide a winding body for a high-voltage winding. By arranging a protrusion on the winding plate to abut the inner wall of the mold, the winding plate can be effectively prevented from loosening and shifting, thereby ensuring the injection quality of the high-voltage insulation layer.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: a winding body of a high-voltage winding, the winding body comprising a plurality of winding plates and a plurality of auxiliary parts, the plurality of auxiliary parts being annular and arranged at intervals along the axial direction of the winding body, the length direction of the plurality of winding plates being arranged along the axial direction of the winding body and being evenly distributed along the circumference of the winding body, the winding plates being clamped and connected to the inner circumference of the auxiliary parts, and at least one group of winding plates being provided with corresponding protrusions.

[0006] The plurality of auxiliary parts include two first auxiliary parts and at least one second auxiliary part. The first auxiliary parts are clamped at the ends of the winding plate, and the second auxiliary part is clamped at the middle of the winding plate.

[0007] A plurality of supporting parts are arranged on the other side of the winding plate where the comb teeth are not arranged. The plurality of supporting parts are arranged along the radial direction of the winding body and are distributed at intervals along the axial direction of the winding body.

[0008] The width of the support parts at both ends of the winding board and the width of the support part in the middle of the winding board are greater than the width of the support parts in other parts of the winding board.

[0009] Among them, all the winding plates provided with protrusions are symmetrically distributed along the central axis section of the winding body.

[0010] Wherein, at least one group of winding plates are provided with first protrusions at both ends, and the first protrusions protrude from the end surfaces of the winding plates along the length direction of the winding plates.

[0011] Wherein, at least two comb teeth of at least one group of winding plates are provided with second protrusions at their tops, and the second protrusions are provided along the radial direction of the winding plates.

[0012] Wherein, on the same winding board, all comb teeth provided with the second protrusions are symmetrically distributed along the center line in the length direction of the winding board.

[0013] The length of the comb teeth in the middle part of the winding plate along the radial direction of the winding body is smaller than the length of the comb teeth in other parts.

[0014] The second purpose of the present application is to provide a high-voltage winding, including the winding body of the aforementioned high-voltage winding, the wire is wound on the winding body to form a high-voltage coil, the high-voltage coil is entirely covered with a high-voltage insulation layer, and the high-voltage insulation layer wraps the two ends of the winding body.

[0015] The beneficial effects of the present application are as follows: different from the prior art, the present application provides a protrusion on the winding plate. On the one hand, the protrusion abuts against the injection mold to further support the winding part, thereby preventing the winding plate from loosely shifting and affecting the quality of the high-voltage winding; on the other hand, the protrusion can leave space between the winding part and the inner wall of the injection mold, thereby facilitating the flow of silicone rubber and evenly wrapping the winding part, thereby ensuring the injection quality of the high-voltage insulation layer.

[0016] In addition, all winding plates with protrusions are symmetrically distributed along the central axis section of the winding body, which can avoid displacement of the winding part due to uneven force when it is installed in the injection mold, affecting the injection quality of the high-voltage insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of a dry-type transformer 10 according to one embodiment of the present application;

[0018] Figure 2 is a top view of a dry-type transformer 10 according to an embodiment of the present application;

[0019] Figure 3 is a front view of an assembled core 110 according to an embodiment of the present application;

[0020] Figure 4 yes Figure 2 Enlarged view of G in the middle;

[0021] Figure 5 is a three-dimensional schematic diagram of a winding body 1310 according to an embodiment of the present application;

[0022] Figure 6 is a front view of a winding plate 1313 according to an embodiment of the present application;

[0023] Figure 7 is a three-dimensional schematic diagram of a first auxiliary member 13111 according to an embodiment of the present application;

[0024] Figure 8 is a three-dimensional schematic diagram of a second auxiliary member 13112 according to an embodiment of the present application;

[0025] Fig. 9 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;

[0026] Fig.10 It is a partial three-dimensional schematic diagram of a high-voltage coil 1320 wound on a winding body 1310 according to another embodiment of the present application;

[0027] Fig.11 is a three-dimensional schematic diagram of a high-voltage winding 130 according to an embodiment of the present application;

[0028] Fig.12 is a schematic circuit diagram of a high voltage coil 1320 according to an embodiment of the present application;

[0029] Fig.13 It is a partial cross-sectional view of the high-voltage winding 130 according to one embodiment of the present application. DETAILED DESCRIPTION

[0030] 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.

[0031] The "connection" described in this application should be understood in a broad sense, unless otherwise clearly specified or limited, and can be directly connected or connected through an intermediate medium. In the description of this application, it should be understood that the orientation or position relationship indicated by "upper", "lower", "end", "one end", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0032] like Figure 1-Figure 3As shown, the dry-type transformer 10 is a three-phase transformer, namely the 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 structure or a triangular structure, and the three transformers 100 are symmetrically structured. In addition, the dry-type transformer 10 can also be an isolation transformer, a frequency conversion transformer, a test transformer, etc.

[0033] In one embodiment, continue to refer to Figure 1-Figure 3 , the three transformers 100 are arranged to form a linear structure. 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, the low-voltage windings 120, and the high-voltage windings 130 are arranged in sequence from the inside to the outside. The iron core 110 includes three columnar iron core bodies 111, an upper yoke 112 located at the upper ends of the three columnar iron core bodies 111, and a lower 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 in sequence from the inside to the outside in one-to-one correspondence. The columnar iron core body 111 is formed by stacking multiple layers of silicon steel sheets, and is fixed by tying with a binding tape outside the multiple layers of silicon steel sheets. The radial cross-section of the columnar iron core body 111 is approximately oval, circular, or other shapes, as long as it can be accommodated in the hollow cavity of the low-voltage winding 120, and there is no limitation here. The upper yoke 112 and the lower yoke 113 are also formed by stacking multiple layers of silicon steel sheets to fixedly connect the three columnar iron core bodies 111, thereby forming a three-phase iron core 110 as shown in Figure 3 .

[0034] Combined with Figure 1 and Figure 2 shown, an iron core clamp 140 is arranged on the outside of the iron core 110. The iron core clamp 140 is formed by connecting three clamps to form a structure similar to a channel steel, that is, the iron core clamp 140 is integrally in a "C" shape structure. Of course, in other embodiments, the iron core clamp can also be a hollow pipe fitting, that is, the iron core clamp is formed by connecting several clamp pieces of plate structures and surrounding them to form a closed structure, making the structure of the iron core clamp more stable.

[0035] Among them, the iron core clamp 140 is made of a fiber-reinforced composite material. Specifically, it can be molded by impregnating glass fiber with epoxy resin, or by impregnating aramid fiber with epoxy resin, or can also be integrally formed with other composite materials, and there is no limitation here.

[0036] Fiber reinforced composite materials refer to composite materials formed by winding, molding or pultrusion of reinforcing fiber materials, such as glass fiber, aramid fiber, etc., with matrix materials. The core clamp 140 made of fiber reinforced composite materials has low cost, light weight, good mechanical properties, and low carbon emissions during the production process of fiber reinforced composite materials, which is greener and more environmentally friendly.

[0037] Combination Figure 2 and Figure 4 As 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. Specifically, the copper foil 121 is formed by winding a whole sheet of copper foil paper, 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 the adjacent copper foil 121 and the low-voltage insulating layer 122, and the support bar 123 is located in the heat dissipation air channel, which is used to support and isolate the adjacent copper foil 121 and the low-voltage insulating layer 122. The support bar 123 is an insulating support bar 123, and a plurality of insulating support bars 123 are provided in each layer of the heat dissipation air channel. The plurality of insulating support bars 123 are arranged at intervals along the circumferential direction of the outer peripheral surface of the copper foil 121, and at the same time play a role in supporting the adjacent copper foil 121 and the low-voltage insulating layer 122. There are at least two insulating support bars 123 arranged in each layer of heat dissipation air duct, which can be two, three, four or more. Preferably, multiple insulating support bars 123 of the same layer are evenly spaced along the circumference of the outer peripheral surface of the copper foil 121. The setting of the heat dissipation air duct can release the heat generated by the low-voltage winding 120 when the dry-type transformer 10 is running, and avoid overheating failure. Among them, the heat dissipation air duct can be set in one layer, or in two or more layers, which is not limited here.

[0038] Among them, the low-voltage insulation layer 122 adopts polyimide impregnated paper, which can be specifically SHS-P diphenyl ether prepreg material, which is made of polyimide film and polysulfone fiber non-woven soft composite material 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 insulating materials, which can be selected according to the different temperature rise levels of the dry-type transformer.

[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 13As shown, the high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320 and a high-voltage insulation layer 1330, and the wire is wound on the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 includes a winding portion 1312, and the wire is wound in the winding portion 1312 to form the high-voltage coil 1320, and the high-voltage coil 1320 includes a plurality of coil segments, and the plurality of coil segments are spaced apart along the axial direction of the winding body 1310.

[0041] The winding part 1312 includes a plurality of winding plates 1313. The length direction of the plurality of winding plates 1313 is arranged along the axial direction of the winding body 1310 and is evenly distributed along the circumference of the winding body 1310. A plurality of winding grooves 1314 are arranged on the winding plates 1313 so that a plurality of comb teeth are formed on one side of the winding plates 1313 for winding the wire. A plurality of supporting parts 1315 are arranged on the other side of the winding plates 1313 where the comb teeth are not arranged, for abutting against the winding tooling. The number of winding plates 1313 is at least two, that is, it can be two, three or more, and there is no limitation here. In order to make the wire winding secure and save materials as much as possible, the number of winding plates 1313 of the 10kV / 1000kVA dry-type transformer is set to twelve.

[0042] The winding plate 1313 is a rectangular plate, and the longer side of the winding plate 1313 is arranged along the axial direction of the winding body 1310. The winding grooves 1314 on the winding plate 1313 are arranged along the radial direction of the winding body 1310 and are spaced apart along the axial direction of the winding body 1310, so that a plurality of comb teeth are formed on one side of the winding plate 1313. The height of the comb teeth on the winding plate 1313 along the axial direction of the winding body 1310 is defined as the tooth height. The tooth height of the comb teeth in the middle of the winding plate 1313 is greater than the tooth height of the comb teeth in other parts. This is because the middle of the winding plate 1313 needs to lead out the tap of the tap line. If the tooth height in the middle of the winding plate 1313 is set a little larger, the distance between the corresponding two adjacent winding grooves 1314 will be larger, and space can be reserved for placing the tap led out from the middle of the winding plate 1313. Furthermore, the radial length of the comb teeth in the middle of the winding plate 1313 along the winding body 1310 is shorter than the length of the comb teeth in other parts, so that a placement space can be reserved for the tap led out from the middle of the winding plate 1313 .

[0043] At least one coil is arranged between two adjacent comb teeth on the winding plate 1313, so that a wire is wound in each winding groove 1314, the high-voltage coil 1320 is arranged in a reasonable distribution, and each coil is arranged at intervals. Specifically, when a plurality of winding plates 1313 are evenly distributed in the circumferential direction, the winding grooves 1314 on all winding plates 1313 are matched one by one in the circumferential direction of the winding body 1310, and each coil is wound by a wire in a corresponding circle of winding grooves 1314 on all winding plates 1313 along the circumferential direction of the winding body 1310, with balanced force and good mechanical strength.

[0044] In other embodiments, in order to allow for the setting positions of the taps, several winding boards may also be arranged unevenly. For example, the distance between two adjacent winding boards is greater than the distance between any other two adjacent winding boards. In this case, each tap is led out from between the two adjacent winding boards. In this way, the tooth height of the comb teeth in the middle of the winding board does not need to be set larger, and the setting positions of each tap can be reserved.

[0045] A number of support portions 1315 are arranged on the other side of the winding plate 1313, that is, the support portion 1315 and the comb teeth are respectively located on two opposite sides of the winding plate 1313, and a number of support portions 1315 are arranged along the radial direction of the winding body 1310 and are distributed at intervals along the axial direction of the winding body 1310. A number of support portions 1315 abut against the outer peripheral surface of the winding tooling, so that under the high temperature condition of injection molding the high-voltage insulation layer 1330, the winding plate 1313 will not soften and deform due to the high temperature, resulting in a lack of support for the high-voltage coil 1320, thereby effectively avoiding the inward deformation of the high-voltage coil 1320 and ensuring the quality of the high-voltage winding 130. In addition, the setting of the support portion 1315 makes it possible to meet the strength design requirements by not setting a large distance between the bottom surface of the winding groove 1314 of the winding plate 1313 and the side surface of the winding plate 1313 where no comb teeth are set. This can reduce the space required for the winding portion 1312, thereby reducing the amount of wire used in the high-voltage coil 1320 and the amount of silicone rubber used in the high-voltage insulation layer 1330, effectively reducing costs, and the size of the high-voltage winding 130 of the same voltage level can also be smaller, saving floor space.

[0046] The width of the support portion 1315 on the winding plate 1313 along the axial direction of the winding body 1310 is defined as the width of the support portion 1315. The width of the support portion 1315 at both ends of the winding plate 1313 and the width of the support portion 1315 in the middle of the winding plate 1313 are greater than the width of the support portion 1315 in other parts of the winding plate 1313. This is because the two ends of the winding plate 1313 need to be grooved to be fixed with the auxiliary member 1311. Setting the width of the support portion 1315 at the end of the winding plate 1313 a little larger can ensure that the groove at the end of the winding plate 1313 will not weaken its mechanical strength, and the support portion 1315 can provide sufficient support for the end of the high-voltage coil 1320. For example, the support portion 1315 and the winding groove 1311 at the end of the winding plate 1313 can be set 314 corresponds to the position and one end of the support portion 1315 extends to be flush with the end surface of the winding plate 1313; and since the tooth height of the comb teeth in the middle of the winding plate 1313 is relatively large, the distance between two adjacent winding grooves 1314 is also relatively large. The width of the support portion 1315 in the middle of the winding plate 1313 is set to be larger, which can ensure that the support portion 1315 can provide sufficient support for the middle of the high-voltage coil 1320. For example, the support portion 1315 can be set to correspond to the position of two adjacent winding grooves 1314 in the middle of the winding plate 1313, that is, the width of the support portion 1315 can cover the two adjacent winding grooves 1314.

[0047] At the same time, the area where the support portion 1315 with a larger width is located is defined as a wide support area, and the area where the support portion 1315 with a smaller width is located is defined as a narrow support area. Then, through the above-mentioned arrangement, the winding plate 1313 forms a first wide support area, a first narrow support area, a second wide support area, a second narrow support area, and a third wide support area in sequence from one end to the other end along the axial direction of the winding body 1310. Furthermore, the first wide support area and the third wide support area are symmetrically arranged with respect to the second wide support area, and the first narrow support area and the second narrow support area are symmetrically arranged with respect to the second wide support area, so that each support portion 1315 can support the high-voltage coil 1320 more evenly and stably. Of course, it can also be arranged asymmetrically, and no specific limitation is made here.

[0048] Further, at least a portion of the support portion 1315 is arranged corresponding to the winding groove 1314. In an application scenario, each support portion 1315 in the portion is arranged corresponding to a winding groove 1314. For the convenience of description, the support portion 1315 in the portion is defined as a first support portion, that is, the support portion 1315 of the portion includes a plurality of first support portions, each of which is arranged on the other side of the winding plate 1313 where no comb teeth are arranged and is located between the extension lines of the two adjacent comb teeth corresponding thereto, and the width of each first support portion is substantially equal to the width of the corresponding winding groove 1314 along the axial direction of the winding body 1310. For example, the first narrow support area and the second narrow support area on the winding plate 1313 are both arranged with the first support portion in the above manner, so that the two areas can better support the corresponding section of the coil through the first support portion, further avoiding the inward deformation of the high-voltage coil 1320. It can be understood that the number and setting area of ​​the first support portion are not specifically limited.

[0049] In another application scenario, at least a portion of the support portion 1315 is arranged corresponding to at least two adjacent winding grooves 1314, and each support portion 1315 in the portion is arranged corresponding to at least two adjacent winding grooves 1314. For the convenience of expression, the support portion 1315 in the portion is defined as a second support portion, that is, the portion of the support portion 1315 includes a plurality of second support portions, each of which is arranged on the other side of the winding plate 1313 where no comb teeth are arranged and is located between the extension lines of the comb teeth at both ends of the corresponding plurality of winding grooves 1314, and the width of each second support portion is approximately equal to the sum of the width of the corresponding plurality of winding grooves 1314 along the axial direction of the winding body 1310 and the tooth height of the comb teeth between the corresponding plurality of winding grooves 1314. For example, a second support portion is arranged corresponding to two adjacent winding grooves 1314, and the second support portion is located between the two corresponding The second support portion is located between the extension lines of the comb teeth at both ends of the winding grooves 1314, and the width of the second support portion is approximately equal to the sum of the width of the two winding grooves 1314 along the axial direction of the winding body 1310 and the tooth height of the comb teeth between the two winding grooves 1314. For another example, a second support portion is arranged corresponding to three adjacent winding grooves 1314, and the second support portion is located between the extension lines of the comb teeth at both ends of the corresponding three winding grooves 1314, and the width of the second support portion is approximately equal to the sum of the width of the three winding grooves 1314 along the axial direction of the winding body 1310 and the tooth height of the two comb teeth between the three winding grooves 1314. The first wide support area, the second wide support area, and the third wide support area are all arranged in the above manner, so that the three areas can better support the two ends and the middle part of the high-voltage coil 1320 through the second support portion, and further avoid the inward deformation of the high-voltage coil 1320. It can be understood that the number and setting area of ​​the second support portion can be designed according to specific needs, and no specific restrictions are made here.

[0050] Furthermore, on each winding plate 1313, a support portion 1315 is provided for each of a number of adjacent winding grooves 1314, for example, a support portion 1315 is provided for each of two adjacent winding grooves 1314, or a support portion 1315 is provided for each of three adjacent winding grooves 1314, so that the number of support portions 1315 can be reduced, and while ensuring the support effect for the high-voltage coil 1320, the structure of the winding plate 1313 is simpler and easier to manufacture. The width and specific setting position of the support portion 1315 can be adjusted according to the support requirements, and no specific restrictions are made here.

[0051] Through the above-mentioned arrangement, the several support portions 1315 on each winding plate 1313 have a serrated structure as a whole. When the winding portion 1312 is fixed on the winding tooling and the support portion 1315 abuts against the outer circumference of the winding tooling, a number of spaced channels will be formed between the winding plate 1313 and the outer circumference of the winding tooling, which can be used to circulate the injected silicone rubber raw material, so that the injection effect is more uniform and the efficiency is higher; at the same time, compared with the winding plate without the support portion 1315, the side without the comb teeth abuts against the outer circumference of the winding tooling, and the winding plate may be damaged due to directly bearing a large injection pressure. During the injection process of the winding plate 1313 of the present application, the silicone rubber raw material can flow from one side of the winding plate 1313 to the other side through the above-mentioned channel, effectively buffering the impact force of the silicone rubber raw material on the winding plate 1313, and preventing the large injection pressure from damaging the winding plate 1313.

[0052] Furthermore, the support portion 1315 is smoothly connected to the winding plate 1313, that is, the radial cross-section of each support portion 1315 along the winding body 1310 is roughly trapezoidal, and the lower base of the trapezoid is connected to the side of the winding plate 1313, so that the waist of the trapezoid and the side of the winding plate 1313 have a smooth transition, which can improve the connection strength between the support portion 1315 and the winding plate 1313, and avoid when the width of the support portion 1315 is smaller than the width of the corresponding winding groove 1314, the distance between the bottom surface of the winding groove 1314 and the other side surface of the winding plate 1313 where the support portion 1315 is set is too small, thereby weakening the mechanical strength of the winding plate 1313, and making it difficult for the winding plate 1313 to withstand the large injection pressure during the injection of the high-voltage insulation layer 1330 and be damaged.

[0053] In this embodiment, the winding plate 1313 is made of glass fiber impregnated with epoxy resin, and multiple layers of glass fiber cloth impregnated with epoxy resin are stacked to a certain thickness, and then molded and cured to form a rectangular glass fiber reinforced plastic plate, and the winding groove 1314 and the support portion 1315 are formed by lathe, thereby forming the winding plate 1313, which uses the least material and can save costs. In other embodiments, the comb-shaped winding plate can also be directly formed by integral casting and curing to simplify the process, and the material of the winding plate is consistent with the above, which will not be repeated.

[0054] The winding body 1310 further includes a plurality of auxiliary parts 1311, which are annular and spaced apart along the axial direction of the winding body 1310, and the auxiliary parts 1311 are connected by clamping with the winding plate 1313. The winding body 1310 omits the structure of the rigid insulating inner liner, so that the heat conduction effect of the high-voltage winding 130 is better, and the interface between the high-voltage insulation layer and the rigid insulating inner liner of the traditional high-voltage winding is eliminated, thereby suppressing the discharge on the surface of the rigid insulating inner liner, saving materials and reducing costs.

[0055] The winding plate 1313 is fixedly arranged on the inner circumference of several auxiliary parts 1311 along the axial direction of the auxiliary part 1311, so that the winding plate 1313 is connected to all auxiliary parts 1311 at the same time, and several winding plates 1313 are evenly distributed along the circumference of the auxiliary part 1311. Among them, the axial direction of the auxiliary part 1311, the axial direction of the winding part 1312, the axial direction of the winding body 1310, and the axial direction of the high-voltage winding 130 are all in the same direction. The auxiliary part 1311 can be a circular ring or an elliptical ring, and can be designed according to the overall shape of the high-voltage winding 130. The auxiliary part 1311 can maintain the stable setting of the winding plate 1313, and prevent the winding plate 1313 from moving and misaligning during the wire winding process and the injection process of the high-voltage insulation layer 1330, resulting in the deviation of the high-voltage coil 1320, affecting the quality of the high-voltage winding 130; and compared with the winding body structure in which the winding plate is fixed on the outside of the auxiliary part, it provides support for the winding plate and the high-voltage coil through the auxiliary part, and it is necessary to manually match and grind the auxiliary part and the winding tooling one by one so that the auxiliary part and the winding tooling can be closely matched and connected, so as to prevent the auxiliary part from moving on the surface of the winding tooling and causing the high-voltage coil to be deformed by force, and the whole assembly process takes too long, and people The labor cost is high. In the present application, the winding plate 1313 is fixed on the inner side of the auxiliary part 1311. The tensioning force of the wire winding can tighten all the winding plates 1313 to the theoretical position on the periphery of the winding tooling. There is no need for the auxiliary part 1311 to provide corresponding support, and there is no need to grind the auxiliary part 1311 and the winding tooling one by one. The winding plate 1313 and the auxiliary part 1311 can be firmly assembled, which greatly saves labor and improves assembly efficiency. It also effectively avoids the winding part 1312 from moving on the surface of the winding tooling, thereby preventing the high-voltage coil 1320 from being deformed due to uneven injection pressure, thereby ensuring the quality of the high-voltage winding 130.

[0056] The auxiliary member 1311 and the winding plate 1313 are provided with corresponding slots, and the two are connected by the slots that match each other. The inner surface of the auxiliary member 1311 is provided with a plurality of first slots 1316, and the plurality of first slots 1316 are evenly arranged along the circumference of the auxiliary member 1311, and the number of the first slots 1316 is equal to the number of the winding plates 1313; a plurality of second slots 1317 are correspondingly arranged on one side of the winding plates 1313 where the comb teeth are arranged, and the plurality of second slots 1317 are arranged at intervals along the length direction of the winding plates 1313, and the number of the second slots 1317 is equal to the number of the auxiliary members 1311; the plurality of winding plates 1313 are respectively correspondingly arranged in the first slots 1316 of the plurality of auxiliary members 1311 through the second slots 1317, so that the plurality of winding plates 1313 are evenly distributed on the inner circumference of the plurality of auxiliary members 1311 in the circumferential direction. At the same time, the first slots 1316 on all auxiliary parts 1311 are matched one by one in the axial direction of the auxiliary parts 1311, so that each winding plate 1313 can be arranged along the axial direction of the auxiliary part 1311, and then the wire is wound in the comb teeth on the winding plate 1313 to form a high-voltage coil 1320, that is, several sections of the high-voltage coil 1320 are spaced apart and distributed in the axial direction of the winding part 1312, with balanced force and good mechanical strength.

[0057] In this embodiment, the plurality of auxiliary components 1311 include two first auxiliary components 13111 and at least one second auxiliary component 13112. Figure 5 , Figure 7 and Figure 8 As shown, the first auxiliary member 13111 is clamped at the end of the winding plate 1313, and a second auxiliary member 13112 is provided to be clamped in the middle of the winding plate 1313. In other embodiments, the number of the first auxiliary member and the second auxiliary member can be adjusted according to the design requirements of the high-voltage winding, for example, including two first auxiliary members, two or three or more second auxiliary members, the first auxiliary member is clamped at the end of the winding plate, and the plurality of second auxiliary members are clamped in the middle of the winding plate at intervals along the axial direction of the winding body; and the first auxiliary member can also be clamped in the middle of the winding plate, and the second auxiliary member can also be clamped at the end of the winding plate, as long as the comb structure of the winding plate is adjusted accordingly, and no specific limitation is made here.

[0058] The inner surface of the first auxiliary part 13111 is provided with a plurality of first slots 1316, and the winding slot 1314 at the end of the winding plate 1313 is provided with a second slot 1317. The second slot 1317 is arranged close to the comb teeth at the end of the winding plate 1313, so that when the winding plate 1313 is installed in the first slot 1316 of the first auxiliary part 13111, the first auxiliary part 13111 can abut against the inner wall of the comb teeth at the end of the winding plate 1313, which can ensure that the connection between the first auxiliary part 13111 and the winding plate 1313 is tighter and does not affect the winding of the coil in the winding slot 1314 at the end of the winding plate 1313. A plurality of first slots 1316 are provided on the inner surface of the second auxiliary component 13112, and a second slot 1317 is provided on the top of the comb teeth in the middle of the winding plate 1313, so that when the winding plate 1313 is installed in the first slots 1316 of the second auxiliary component 13112, the winding of the coil in the winding slot 1314 in the middle of the winding plate 1313 is not affected.

[0059] The width of the first slot 1316 along the circumferential direction of the auxiliary member 1311 is defined as the slot width of the first slot 1316, the width of the second slot 1317 along the length direction of the winding plate 1313 is defined as the slot depth of the second slot 1317, the width of the winding plate 1313 along the circumferential direction of the winding body 1310 is defined as the thickness of the winding plate 1313, the slot width of the first slot 1316 matches the thickness of the winding plate 1313, the slot depth of the second slot 1317 matches the thickness of the auxiliary member 1311 at the first slot 1316, so that the winding plate 1313 It is firmly assembled with the auxiliary part 1311 to avoid the situation where the width of the first slot 1316 is smaller than the thickness of the winding board 1313 or the depth of the second slot 1317 is smaller than the thickness of the auxiliary part 1311 at the first slot 1316, which makes it difficult to fix the winding board 1313 on the auxiliary part 1311. It also avoids the situation where the width of the first slot 1316 is larger than the thickness of the winding board 1313 or the depth of the second slot 1317 is larger than the thickness of the auxiliary part 1311 at the first slot 1316, which makes it impossible to firmly match and cause the winding board 1313 to fall off from the inner side of the auxiliary part 1311.

[0060] Furthermore, the winding plate 1313 is fixed to the auxiliary part 1311 by an adhesive, that is, the second slot 1317 of the winding plate 1313 is fixedly connected to the first slot 1316 of the auxiliary part 1311 by an adhesive, which can make the connection between the winding plate 1313 and the auxiliary part 1311 more stable. The adhesive is a two-component high-temperature resistant epoxy adhesive, and of course it can also be other adhesives, but it is necessary to ensure that the adhesive can make the winding plate 1313 and the auxiliary part 1311 firmly bonded, and the adhesive needs to be resistant to high temperatures to adapt to the high-voltage insulation layer 1330 using high-temperature injection to cover the winding plate 1313 and the auxiliary part 1311.

[0061] Furthermore, a plurality of grooves 1318 are provided on a side plate surface of each first auxiliary part 13111 close to the comb teeth at the end of the winding plate 1313. The plurality of grooves 1318 are connected to a plurality of first slots 1316 one by one and are also provided corresponding to a plurality of winding plates 1313 for accommodating the comb teeth at the end of the winding plate 1313. A plurality of grooves 1318 are radially arranged along the first auxiliary part 13111 and evenly distributed along the circumference of the first auxiliary part 13111, the grooves 1318 penetrate the plate surface of the first auxiliary part 13111, and the width of the grooves 1318 along the circumference of the first auxiliary part 13111 matches the thickness of the winding plate 1313, and the depth of the grooves 1318 along the axial direction of the first auxiliary part 13111 matches the tooth height of the comb teeth at the end of the winding plate 1313, so that when the second groove 1317 at the end of the winding plate 1313 is fixedly connected to the first groove 1316 of the first auxiliary part 13111, the comb teeth at the end of the winding plate 1313 can be accommodated in the grooves 1318, and the two end surfaces of the winding plate 1313 are respectively flush with the plate surfaces of the two first auxiliary parts 13111 that are far away from each other. Compared with the winding part structure of the winding plate protruding from the auxiliary part plate surface, the structure of the present application can effectively prevent the injection impact force generated by the high-temperature vulcanized silicone rubber when being injected outside the winding body 1310 from impacting the comb teeth at the end of the winding plate 1313, thereby causing the winding plate 1313 to be offset or even damaged, affecting the quality of the high-voltage winding 130.

[0062] Furthermore, a plurality of flow grooves 1319 are provided on the inner side of the first auxiliary member 13111, so that during the injection molding process of the high-voltage insulating layer 1330, the injected silicone rubber raw material can flow from the end of the winding portion 1312 into the inner side of the winding portion 1312, thereby allowing the high-voltage insulating layer 1330 to fully fill the gap between the winding portion 1312 and the high-voltage coil 1320 and the two ends of the winding portion 1312. In this embodiment, four flow grooves 1319 are provided, and the four flow grooves 1319 are symmetrically arranged on the inner side of the first auxiliary member 1311, so that the injected silicone rubber raw material can flow more evenly and improve the injection quality. In other embodiments, one, two, three or more flow grooves may be provided, or they may be asymmetrically arranged, which is not specifically limited here.

[0063] The radial width of the auxiliary part 1311 along the winding body 1310 is defined as the width of the auxiliary part 1311, and the radial width of the winding plate 1313 along the winding body 1310 is defined as the width of the winding plate 1313. Since the first auxiliary part 13111 plays a main fixing role on the two ends of the winding plate 1313, and the second auxiliary part 13112 plays an auxiliary fixing role on the middle part of the winding plate 1313, setting the width of the first auxiliary part 13111 to be greater than the width of the second auxiliary part 13112 can reduce material usage and reduce costs while ensuring the stable assembly of the winding part 1312. The width of the first auxiliary member 13111 is substantially equal to the width of the winding plate 1313, which can ensure the stable assembly of the winding portion 1312 and prevent the winding plate 1313 from being damaged due to the large injection pressure during the injection of the high-voltage insulation layer 1330. On the other hand, it can also have a certain limiting effect on the coil wound in the winding groove 1314 at the end of the winding plate 1313, avoiding the displacement of the wire and affecting the quality of the high-voltage winding 130. The width of the second auxiliary member 13112 can be smaller than the width of the winding plate 1313, for example, it can be one-half, one-third, etc. of the width of the winding plate 1313, so that it can assist in fixing the winding plate 1313 while not affecting the high-voltage coil 1320 from leading out the tap in the middle of the winding plate 1313.

[0064] At least one group of winding plates 1313 is also provided with corresponding protrusions for abutting the inner wall of the injection mold. In this way, when the winding body 1310 wound with the high-voltage coil 1320 is placed into the injection mold together with the winding tooling, on the one hand, the protrusions abutting the injection mold can further support the winding part 1312, thereby preventing the winding plate 1313 from loosely shifting and affecting the quality of the high-voltage winding 130; on the other hand, the protrusions can leave space between the winding part 1312 and the inner wall of the injection mold, which facilitates the flow of silicone rubber and evenly wraps the winding part 1312, thereby ensuring the injection quality of the high-voltage insulation layer 1330.

[0065] Furthermore, all winding plates 1313 provided with protrusions are symmetrically distributed along the central axis section of the winding body 1310, which can prevent the winding portion 1312 from being displaced due to uneven force when installed in the injection mold, thereby affecting the injection quality of the high-voltage insulation layer 1330. Among them, at least one group of winding plates 1313 may include two, four, six or more winding plates 1313, and there is no specific limitation on the number of winding plates 1313 provided with protrusions.

[0066] In an application scenario, such as Fig. 9As shown, at least one group of winding plates 1313 are provided with first protrusions 13131 at both ends, and the first protrusions 13131 protrude from the end surface of the winding plate 1313 along the length direction of the winding plate 1313, that is, protrude from the plate surface of the first auxiliary component 13111. When the winding body 1310 wound with the high-voltage coil 1320 is placed into the injection mold together with the winding tooling, the first protrusion 13131 on the winding plate 1313 can abut against the inner wall of the end of the injection mold, further supporting the winding part 1312, avoiding the loose displacement of the winding plate 1313 and affecting the quality of the high-voltage winding 130, and at the same time leaving space between the first auxiliary component 13111 and the inner wall of the end of the injection mold to facilitate the flow of silicone rubber, so that the high-voltage insulating layer 1330 can wrap the two ends of the winding part 1312. In this embodiment, first protrusions 13131 are provided at both ends of the eight winding plates 1313 symmetrically arranged on both sides of the winding portion 1312, which can ensure that the winding portion 1312 is subjected to a more uniform force when installed in the injection mold, thereby ensuring the support effect while reducing the amount of material used and reducing costs. It is understandable that the number and distribution position of the first protrusions 13131 can be adjusted according to the support requirements.

[0067] In another application scenario, a second protrusion is set on the top of at least two comb teeth of at least one group of winding plates 1313, and the second protrusion is set along the radial direction of the winding plate 1313. When the winding body 1310 wound with the high-voltage coil 1320 is placed in the injection mold together with the winding tooling, the second protrusion on the winding plate 1313 can abut against the inner circumferential wall of the injection mold, further supporting the winding part 1312, avoiding the loose displacement of the winding plate 1313 and affecting the quality of the high-voltage winding 130, and at the same time leaving space between the outer circumferential surface of the winding part 1312 and the inner circumferential wall of the injection mold to facilitate the flow of silicone rubber, so that the high-voltage insulation layer 1330 can wrap the outer circumferential surface of the winding part 1312.

[0068] Furthermore, on the same winding plate 1313, all comb teeth with second protrusions are symmetrically distributed along the center line of the length direction of the winding plate 1313. In this embodiment, the winding plate 1313 has four comb teeth symmetrically arranged along the central cross section of the winding body 1310, and second protrusions are arranged on all winding plates 1313 and the arrangement positions are matched, which can ensure that the winding part 1312 is more evenly stressed when installed in the injection mold. It can be understood that the number and distribution position of the second protrusions can be adjusted according to the support requirements, and no specific restrictions are made here.

[0069] In this embodiment, the auxiliary component 1311 is also made of glass fiber impregnated with epoxy resin. Multiple layers of glass fiber cloth impregnated with epoxy resin are stacked to a certain thickness and molded and cured to form a fiberglass component. The winding plate 1313 and the auxiliary component 1311 are separately formed and fixed by clamping and bonding.

[0070] The winding body 1310 is made of the above-mentioned fiber-reinforced composite material, which has the characteristics of light weight and high strength, so that the winding body 1310 has good mechanical strength, can effectively support the winding of the wire, is not easy to be damaged, and avoids the injection impact force generated when the high-temperature vulcanized silicone rubber is injected outside the winding body 1310 to disperse and shift the wire; and the fiber-reinforced composite material has good heat resistance, which avoids the deformation of the winding body 1310 due to excessive heat generated by the high-voltage coil 1320 during the operation of the dry-type transformer 10.

[0071] Combination Fig.10 As shown, in order to make the inner wall of the high-voltage winding 130 smoother and improve the insulation performance of the inner wall of the high-voltage winding 130, the winding body 1310 is provided to further include an inner lining layer 1340, the inner lining layer 1340 is a hollow cylindrical structure, and a plurality of winding plates 1313 are evenly distributed on the outer circumference of the inner lining layer 1340. The size of the inner lining layer 1340 matches the inner wall of the high-voltage winding 130, which can save materials and reduce costs while ensuring the smoothness of the inner wall of the high-voltage winding 130.

[0072] The inner lining layer 1340 includes a supporting layer 1341 and a fusion layer 1342, and the supporting layer 1341 and the fusion layer 1342 are closely arranged. The supporting layer 1341 is made of vulcanized silicone rubber, and the fusion layer 1342 is made of unvulcanized silicone rubber. The supporting layer 1341 can further enhance the supporting effect on the winding part 1312, and the fusion layer 1342 can be vulcanized together with the silicone rubber raw material of the high-voltage insulation layer 1330 during injection molding to exert its fusion effect, thereby improving the fusion effect between the winding part 1312 of the composite material and the high-voltage insulation layer 1330 of silicone rubber, thereby improving the insulation performance of the inner wall of the high-voltage winding 130 and making the inner wall of the high-voltage winding 130 smoother and flatter.

[0073] Specifically, the vulcanized silicone rubber is defined as cooked rubber, and the unvulcanized silicone rubber is defined as raw rubber. The support layer 1341 is a cooked rubber sheet with a certain thickness, and the fusion layer 1342 is a raw rubber sheet with a certain thickness. The specifications of the cooked rubber sheet and the raw rubber sheet match the inner wall of the high-voltage winding 130. For example, they can be the same as or slightly larger than the length of the inner wall of the winding part 1312, so as to ensure that the inner lining layer 1340 covers the inner wall of the high-voltage winding 130. The sheet-shaped support layer 1341 and the sheet-shaped fusion layer 1342 are overlapped and butt-wound to form a hollow cylindrical structure, so as to obtain a flexible inner lining layer 1340.

[0074] When assembling the winding body 1310, first overlap the corresponding cooked rubber sheet and the raw rubber sheet and then wind them on the outer circumference of the winding tooling, and connect the two ends to form a hollow cylindrical structure, that is, form an inner lining layer 1340, and then clamp and fix the winding plate 1313 and the auxiliary part 1311 to form a hollow winding part 1312, and finally put the assembled winding part 1312 on the outer periphery of the inner lining layer 1340 to complete the assembly of the winding body 1310 and wait for the subsequent wire winding.

[0075] In this embodiment, since the raw rubber sheet has not yet been vulcanized, its surface is more easily scratched and damaged than the cooked rubber sheet, so the support layer 1341 is arranged on the outside of the inner lining layer 1340, and the fusion layer 1342 is arranged on the inside of the inner lining layer 1340, that is, a plurality of winding plates 1313 are evenly distributed on the outer peripheral surface of the cooked rubber sheet in the circumferential direction, and the raw rubber sheet is attached to the outer peripheral surface of the winding tooling. On the one hand, it can avoid the inner lining layer 1340 from being damaged due to the assembly gap problem when the winding part 1312 is sleeved on the outer periphery of the inner lining layer 1340. On the other hand, before the high-voltage insulating layer 1330 is fully formed, the raw rubber sheet of the fusion layer 1342 and the raw rubber material used to prepare the high-voltage insulating layer 1330 are respectively located on both sides of the cooked rubber sheet of the support layer 1341. When the raw rubber is vulcanized at high temperature, it can be fused to a certain extent with the surface of the cooked rubber to ensure the fusion effect of the lining layer 1340, and improve the smoothness of the inner wall of the high-voltage winding 130 while improving its insulation performance. In other embodiments, the support layer can also be located on the inside and the fusion layer can be located on the outside, as long as the surface of the inner lining layer is not damaged during the assembly of the winding part, and no specific restrictions are made here.

[0076] Furthermore, the inner lining layer 1340 also includes an intermediate layer, and the support layer 1341, the intermediate layer, and the fusion layer 1342 are arranged closely in sequence, and the intermediate layer uses a glass fiber mesh cloth or an aramid fiber mesh cloth, which can further improve the mechanical properties of the inner lining layer 1340 and improve its support effect on the winding part 1312. When preparing the inner lining layer 1340, the support layer 1341, the intermediate layer, and the fusion layer 1342 are overlapped and wound in sequence to form a hollow cylindrical structure.

[0077] Combination Figure 5 , Figure 6 , Fig. 9 , Fig.12 and Fig.13As shown, 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 wire is wound in the winding groove 1314 of the winding part 1312, so that the high-voltage coil 1320 is spaced apart in the axial direction of the winding body 1310, and the wire forms two external connections at the head and tail ends after winding, namely, a first external connection D and a second external connection X. The first external connection D is used to connect the cable, and the second external connection X is used to connect other external connections, such as in a three-phase transformer, for mutual connection with each phase transformer. The wire leads to six taps in the middle part of the winding body 1310 along its axial direction, namely, tap 2, tap 3, tap 4, tap 5, tap 6 and tap 7. The six taps form a tap switch. For ease of description, tap 2, tap 4 and tap 6 are defined as the first tap switch, and tap 3, tap 5 and tap 7 are defined as the second tap switch.

[0078] In one application scenario, the conductor includes a first conductor and a second conductor, both of which are continuous conductors, and the first conductor and the second conductor are both coated with an insulating layer, and the insulating layer may be a polyimide film or a glass fiber film, or the insulating layer may be other insulating materials such as polyester paint, or a combination of multiple insulating materials may be used, which is not limited here. For the convenience of description, when the high-voltage winding 130 is placed vertically, the upper end of the winding portion 1312 is defined as the first end, and the lower end of the winding portion 1312 is defined as the second end. The first conductor is wound from the first end of the winding portion 1312 along the axial direction of the winding body 1310 to the middle of the winding portion 1312, and three taps are led out. The first conductor is wound from the first end of the winding part 1312 to the second end of the winding part 1312. The first conductor is wound around the designed number of turns in the first winding slot 1314 corresponding to a circle on all winding plates 1313 to form a first section coil 1321. The first section coil 1321 is wound in a pancake-like manner, and only one pancake coil is arranged in each winding slot 1314. At this time, each section coil has only one pancake coil. The inner turn wire end of the first section coil 1321 (i.e., the head end of the first conductor) is the first external connection D. The outer turn wire end of the first section coil 1321 extends to the second winding slot 1314 corresponding to a circle on all winding plates 1313 and continues to be wound to form the second section coil 1322. And so on, until the first conductor is wound around the middle of the winding body 1310 to form several sections of coils, and three taps are respectively led out through the outer turn wire ends of three of the sections of coils, i.e., Fig.12 The tap 6, tap 4 and tap 2 are shown, and the winding of the first conductor is now complete.

[0079] The second conductor is wound from the middle of the winding part 1312 along the axial direction of the winding body 1310 to the second end of the winding part 1312, and three more taps are led out. Specifically, the second conductor starts to be wound in the next winding groove 1314 adjacent to the tap 2 to form the third segment coil 1323, and the second conductor continues to be wound to the second end of the winding part 1312 in the same winding manner as the first conductor to form several segments of coils, and in the winding process, three more taps are led out from the three segments of coils starting from the third segment coil 1323, namely, tap 3, tap 5 and tap 7, until the second conductor is wound to the last winding groove 1314 of a corresponding circle on each winding plate 1313 at the second end of the winding part 1312 and forms a terminal segment coil 1324. The outer turn wire end of the terminal segment coil 1324 (i.e., the end of the second conductor) is the second external connection X, and the second conductor is wound up.

[0080] When the wire is wound, it is wound in a circle of winding grooves 1314 corresponding to all winding plates 1313, so that each coil formed by the winding of the wire is perpendicular to the axis of the winding body 1310, the winding is convenient and the wire is arranged neatly, the winding plate 1313 is evenly stressed, and the mechanical strength is good.

[0081] In this way, a pancake-shaped high-voltage coil 1320 is formed, which has good mechanical strength and strong ability to withstand the electromotive force generated by short-circuit current. Compared with the layer-shaped coil, it has more pancakes and better heat dissipation capacity. In addition, in the axial direction of the winding body 1310, the first tap switch and the second tap switch are arranged in parallel, and six taps form a tapping device of the high-voltage coil 1320, which is used for the dry-type transformer 10 to adjust the voltage according to different operating conditions. Of course, the layer-shaped coil can also be used in other embodiments.

[0082] The wire is wound on the winding body 1310 to form a high-voltage coil 1320, so that the high-voltage coil 1320 is ring-shaped, and the ring width of the high-voltage coil 1320 is defined as the width of the high-voltage coil 1320. The width of the high-voltage coil 1320 on each radial section is consistent, so that the overall force of the high-voltage coil 1320 is balanced. Of course, considering the actual operation situation, the width of each coil on its radial section may not be exactly the same, as long as it is roughly the same.

[0083] In this embodiment, the tap switch includes six taps, and the dry-type transformer 10 has five gears for adjusting the voltage. In other embodiments, the tap switch may also include four taps, that is, the first tap switch and the second tap switch each include two taps, and the dry-type transformer includes three gears for adjusting the voltage. As long as it meets the actual use requirements of the dry-type transformer, it is not limited here.

[0084] like Fig. 9 , Fig.11As shown, the high-voltage insulation layer 1330 wraps the high-voltage coil 1320 and the winding body 1310 to form the high-voltage winding 130. The high-voltage insulation layer 1330 is a high-temperature vulcanized silicone rubber. The wire is first wound on the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 and the high-voltage coil 1320 are used as the body to be injected. The body to be injected is placed in an injection mold, and the high-temperature vulcanized silicone rubber is injected as a whole on the periphery of the body to be injected by adding silicone rubber raw materials 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.

[0085] 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.

[0086] After 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 gap between the high-voltage coil 1320 and the winding body 1310 and wraps the two ends of the winding body 1310, so that the high-voltage winding 130 is a hollow column as a whole, which can be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylindrical bodies.

[0087] Before the overall injection of high-temperature vulcanized silicone rubber, a tooling connector can be arranged on the injection mold. The tooling connector is provided with protective cavities corresponding to the six taps. The taps are fixed in the protective cavities accordingly, and the remaining space in the protective cavities is filled with connectors such as bolts, thereby preventing the six taps from being covered by the silicone rubber during the injection process and being unable to be used for wiring.

[0088] The high-voltage winding 130 of the present application is prepared with a high-voltage insulating layer 1330 of high-temperature vulcanized silicone rubber outside the high-voltage coil 1320. Compared with the epoxy resin high-voltage insulating layer in the prior art, it has the following advantages: 1) It has good fire resistance, low-temperature resistance, aging resistance and short-circuit test resistance, which can effectively 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 recovery rate is greater than 99%, which is more environmentally friendly; 3) The silicone rubber elastomer can weaken the local discharge inducement caused by mechanical vibration, and has an inhibitory effect on equipment discharge. The product of silicone rubber under the discharge action is non-conductive silicon dioxide, which can effectively inhibit the continued degradation of insulation; 4) It can reduce the operating loss of the transformer and save more energy; 5) It has good resistance to harsh environments and can be installed indoors and outdoors. At the same time, the present application uses overall high-temperature vulcanization injection molding. Compared with the existing room temperature vulcanization, this process method makes the high-voltage insulation layer 1330 more stable and has higher mechanical properties, and has 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. In addition, compared with liquid silicone rubber, the high-temperature vulcanized silicone rubber filler of the present application is evenly dispersed, and the dry-type transformer 10 will not generate partial discharge due to filler agglomeration, so that the overall performance of the dry-type transformer 10 is better.

[0089] In this embodiment, if Fig.13 As shown, it is a partial cross-sectional view of a high-voltage winding 130 coated with a high-voltage insulating layer 1330 cut along its axial direction. The wire adopts the aforementioned winding method and is wound in a comb-tooth-shaped winding plate 1313 to form a pancake-shaped high-voltage coil 1320. In the axial direction of the high-voltage winding 130, the pancake-shaped high-voltage coil 1320 is spaced apart from the comb teeth of the winding plate 1313, that is, a pancake coil is provided between two adjacent comb teeth. In other embodiments, the wire can also be formed into a high-voltage coil by other winding methods, as long as the structure of the winding part is adjusted accordingly. For example, when the width of the winding groove on the winding plate is increased according to the winding requirements, the support effect can be ensured by increasing the width of the corresponding support part, or by increasing the number of the corresponding support parts, and no specific limitation is made here.

[0090] 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 winding body of a high voltage winding, characterized in that: The winding body includes a plurality of winding plates and a plurality of auxiliary parts, wherein the plurality of auxiliary parts are annular and are arranged at intervals along the axial direction of the winding body, the length directions of the plurality of winding plates are arranged along the axial direction of the winding body and are evenly distributed along the circumference of the winding body, the winding plates are clamped and connected to the inner circumference of the auxiliary parts, and at least one group of the winding plates is provided with corresponding protrusions.

2. The winding body of the high voltage winding according to claim 1, characterized in that: The plurality of auxiliary parts include two first auxiliary parts and at least one second auxiliary part, the first auxiliary parts are clamped at the ends of the winding board, and the second auxiliary part is clamped at the middle of the winding board.

3. The winding body of the high voltage winding according to claim 1, characterized in that: A plurality of supporting parts are arranged on the other side of the winding plate where the comb teeth are not arranged. The plurality of supporting parts are arranged along the radial direction of the winding body and are distributed at intervals along the axial direction of the winding body.

4. The winding body of the high voltage winding according to claim 3, characterized in that: The width of the support parts at both ends of the winding board and the width of the support part in the middle of the winding board are greater than the width of the support parts in other parts of the winding board.

5. The winding body of the high voltage winding according to claim 1, characterized in that: All the winding plates provided with the protrusions are symmetrically distributed along the central axis section of the winding body.

6. The winding body of the high voltage winding according to claim 1, characterized in that: At least one group of the winding plates are provided with first protrusions at both ends, and the first protrusions protrude from the end surfaces of the winding plates along the length direction of the winding plates.

7. The winding body of the high voltage winding according to claim 1, characterized in that: At least two comb teeth of at least one group of the winding plates are provided with second protrusions at their tops, and the second protrusions are provided along the radial direction of the winding plates.

8. The winding body of the high voltage winding according to claim 7, characterized in that: On the same winding board, all the comb teeth provided with the second protrusions are symmetrically distributed along the center line in the length direction of the winding board.

9. The winding body of the high voltage winding according to claim 1, characterized in that: The length of the comb teeth in the middle part of the winding plate along the radial direction of the winding body is smaller than the length of the comb teeth in other parts.

10. A high voltage winding, characterized in that: A winding body of a high-voltage winding as described in any one of claims 1 to 9, a wire is wound on the winding body to form a high-voltage coil, the high-voltage coil is entirely covered with a high-voltage insulation layer, and the high-voltage insulation layer wraps both ends of the winding body.

Images