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

Abstract

Disclosed in the present application is a winding body of a high-voltage winding, comprising an inner liner layer and a plurality of winding plates. The inner liner layer is a flexible hollow cylindrical structure; the length direction of the plurality of winding plates is arranged in the axial direction of the winding body; the plurality of winding plates are uniformly distributed on the outer peripheral surface of the inner liner layer in the circumferential direction; the winding plates are provided with a plurality of winding slots for winding of wires. Further disclosed in the present application is a high-voltage winding. In the present application, by means of providing the flexible inner liner layer, the inner wall of the high-voltage winding is smoother and flatter, and the insulation performance of the high-voltage winding is improved.

Description

A high-voltage winding body and a high-voltage winding Technical Field

[0001] This application relates to the field of power transformer technology, and in particular to a high-voltage winding body and a high-voltage winding. Background Technology

[0002] Transformers can currently be classified into three types: oil-immersed transformers, dry-type transformers, and gas-fired transformers. Dry-type transformers offer advantages such as being oil-free, fire-resistant, having a long lifespan, being energy-efficient and low-noise, easy to maintain, and safe and reliable. Most dry-type transformers currently on the market are either resin-cast high-voltage windings or open-type. Although dry-type transformers have seen significant development in the past decade, problems such as insulation cracking, poor thermal conductivity, and harsh operating environments still exist during operation.

[0003] Currently, the high-voltage winding structure of dry-type transformers typically employs two methods. One method involves bonding a rigid support cylinder and a rigid comb plate together, resulting in a simple and reliable structure, but with higher material costs. The other method involves clamping a rigid comb plate and annular support bars together. Several comb plates are circumferentially clamped onto the outer periphery of the spaced-apart annular support bars to form a winding skeleton. This skeleton is then fitted onto a winding fixture, and wires are wound to form a high-voltage coil. Subsequently, the coil is placed in an injection mold and high-temperature silicone rubber is injected to mold the high-voltage winding. Because the winding skeleton is pressed tightly against the outer periphery of the winding fixture, after the high-voltage insulation layer is injected, the inner wall of the auxiliary components of the winding body will be partially exposed, reducing the flatness of the inner wall of the high-voltage winding and affecting its insulation performance. Summary of the Invention

[0004] In view of the shortcomings of the prior art, one of the objectives of this application is to provide a winding body for a high-voltage winding, which improves its insulation performance by setting a flexible inner liner layer to make the inner wall of the high-voltage winding smoother and flatter.

[0005] To achieve the above objectives, the technical solution adopted in this application is: a high-voltage winding body, including an inner liner and several winding plates. The inner liner is a flexible hollow cylindrical structure. The length direction of the several winding plates is arranged along the axial direction of the winding body. The several winding plates are evenly distributed circumferentially on the outer circumferential surface of the inner liner. Several winding grooves are provided on the winding plates for winding conductors.

[0006] In one embodiment, the winding body further includes several auxiliary components, which are arranged in a ring shape and spaced apart along the axial direction of the winding body. The auxiliary components are engaged with the winding plate.

[0007] In one embodiment, the liner includes a support layer and a fusion layer, which are disposed in close contact with each other.

[0008] In one embodiment, the specifications of the inner liner are matched to the inner wall of the high-voltage winding.

[0009] In one embodiment, the support layer is made of vulcanized silicone rubber, and the fusion layer is made of unvulcanized silicone rubber.

[0010] In one embodiment, the support layer is located outside the fusion layer, and a plurality of winding plates are circumferentially distributed on the outer peripheral surface of the support layer.

[0011] In one embodiment, the fusion layer is located outside the support layer, and a plurality of winding plates are circumferentially distributed on the outer peripheral surface of the fusion layer.

[0012] In one embodiment, the inner liner layer further includes an intermediate layer, and the support layer, intermediate layer, and fusion layer are sequentially and closely attached to each other.

[0013] In one embodiment, the intermediate layer is made of glass fiber mesh or aramid fiber mesh.

[0014] The second objective of this application is to provide a high-voltage winding, including the aforementioned high-voltage winding winding body, with conductors wound on the winding body to form a high-voltage coil, the high-voltage coil being entirely covered by a high-voltage insulation layer, and the high-voltage insulation layer covering both ends of the winding body.

[0015] In one embodiment, the high-voltage insulation layer is made of high-temperature vulcanized silicone rubber or liquid silicone rubber.

[0016] The beneficial effects of this application are as follows: Unlike the prior art, this application provides an inner lining layer on the inner side of the winding plate. The inner lining layer includes a support layer and a fusion layer that are closely attached to each other. The support layer can further enhance the support effect on the winding part and prevent the high-voltage coil from sinking and deforming. The fusion layer can be vulcanized together with the silicone rubber raw material of the high-voltage insulation layer during molding, so as to exert its fusion effect, improve the fusion effect between the winding part of the composite material and the high-voltage insulation layer of silicone rubber, and make the inner wall of the high-voltage winding smoother and flatter while improving its insulation performance.

[0017] In addition, the inner liner of this application also includes an intermediate layer, which can further improve the mechanical properties of the inner liner and enhance its support effect on the winding section. Attached Figure Description

[0018] Figure 1 is a front view of a dry-type transformer 10 according to an embodiment of this application;

[0019] Figure 2 is a top view of a dry-type transformer 10 according to an embodiment of this application;

[0020] Figure 3 is a front view of the assembled iron core 110 according to one embodiment of this application;

[0021] Figure 4 is an enlarged view of point G in Figure 2;

[0022] Figure 5 is a perspective view of the winding body 1310 according to an embodiment of this application;

[0023] Figure 6 is a front view of the winding plate 1313 according to an embodiment of this application;

[0024] Figure 7 is a perspective view of the first auxiliary component 13111 according to an embodiment of this application;

[0025] Figure 8 is a perspective view of the second auxiliary component 13112 according to an embodiment of this application;

[0026] Figure 9 is a perspective view of a high-voltage coil 1320 wound on a winding body 1310 according to an embodiment of this application.

[0027] Figure 10 is a partial perspective view of a high-voltage coil 1320 wound on a winding body 1310 according to another embodiment of this application.

[0028] Figure 11 is a perspective view of a high-voltage winding 130 according to an embodiment of this application;

[0029] Figure 12 is a simplified circuit diagram of a high-voltage coil 1320 according to an embodiment of this application;

[0030] Figure 13 is a partial cross-sectional view of the high-voltage winding 130 according to an embodiment of this application. Detailed Implementation

[0031] As requested, specific embodiments of this application are disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of this application and may be embodied in various forms. Therefore, the specific details disclosed herein are not intended to be limiting, but merely to serve as the basis for the claims and as a representative basis for teaching those skilled in the art to apply this application differently in practice in any appropriate manner, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0032] The term "connection" as used in this application, unless otherwise explicitly specified or limited, should be interpreted broadly, encompassing both direct connection and connection via an intermediate medium. In the description of this application, it should be understood that the orientation or positional relationship indicated by terms such as "upper," "lower," "end," and "one end" is based on the orientation or positional relationship shown in the accompanying drawings and is used solely for the convenience of describing this application and for simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0033] As shown in FIGS. 1 - 3, the dry-type transformer 10 is a three-phase transformer, namely phase A, phase B, and phase C, 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 symmetrically structured. In addition, the dry-type transformer 10 can also be an isolation transformer, a frequency conversion transformer, a test transformer, etc.

[0034] In one embodiment, continue to refer to FIGS. 1 - 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 one by one in 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 generally oval or 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 the three-phase iron core 110 as shown in FIG. 3.

[0035] Combined with FIGS. 1 and 2, an iron core clamping member 140 is provided outside the iron core 110. The iron core clamping member 140 is formed by connecting three clamping members to form a structure similar to a channel steel, that is, the iron core clamping member 140 is integrally in a "匚" - shaped structure. Of course, in other embodiments, the iron core clamping member can also be a hollow pipe fitting, that is, the iron core clamping member is formed by connecting several clamping members in a plate structure and surrounding them to form a closed structure, making the structure of the iron core clamping member more stable.

[0036] Among them, the iron core clamping member 140 is made of a fiber-reinforced composite material. Specifically, it can be formed by impregnating glass fiber with epoxy resin by molding, or by impregnating aramid fiber with epoxy resin by molding, or can also be integrally formed with other composite materials, and there is no limitation here.

[0037] Fiber-reinforced composite materials refer to composite materials formed by combining reinforcing fiber materials, such as glass fiber and aramid fiber, with a matrix material through molding processes such as winding, molding, or pultrusion. Iron core clamps made of fiber-reinforced composite materials are low in cost, lightweight, and have good mechanical properties. Furthermore, the production process of fiber-reinforced composite materials has low carbon emissions, making it greener and more environmentally friendly.

[0038] Referring to Figures 2 and 4, the low-voltage winding 120 includes copper foil 121, a low-voltage insulation layer 122, and support bars 123, with the copper foil 121 and the low-voltage insulation layer 122 alternately arranged. Specifically, the copper foil 121 is formed by winding a whole sheet of copper foil paper, and the low-voltage insulation layer 122 is overlapped with the copper foil 121 and wound together. The low-voltage winding 120 is provided with at least one heat dissipation channel, which is located between adjacent copper foils 121 and low-voltage insulation layers 122, and the support bars 123 are located within the heat dissipation channel, used to support and isolate adjacent copper foils 121 and low-voltage insulation layers 122. The support bars 123 are insulating support bars 123, and multiple insulating support bars 123 are provided in each heat dissipation channel. The multiple insulating support bars 123 are arranged circumferentially along the outer periphery of the copper foil 121, and at intervals, simultaneously serving to support adjacent copper foils 121 and low-voltage insulation layers 122. Each heat dissipation duct contains at least two, and may contain two, three, four, or more insulating support strips 123. Preferably, multiple insulating support strips 123 in the same layer are evenly spaced along the circumferential direction of the outer periphery of the copper foil 121. The heat dissipation duct can release the heat generated by the low-voltage winding 120 during the operation of the dry-type transformer 10, preventing overheating failure. The heat dissipation duct can be provided in one layer, or in two or more layers; no limitation is imposed here.

[0039] Among them, the low-voltage insulation layer 122 is made of polyimide impregnated paper, specifically SHS-P diphenyl ether prepreg material, which is made by impregnating diphenyl ether resin with a soft composite material of polyimide film and polysulfone fiber nonwoven fabric and then baking. Of course, the low-voltage insulation layer can also be made of DMD insulation paper or silicone rubber film, or other insulation materials, depending on the different temperature rise levels of the dry-type transformer.

[0040] The insulating support strip 123 is made of glass fiber impregnated with epoxy resin or aramid fiber impregnated with epoxy resin, without limitation. Furthermore, the insulating support strip 123 is an I-shaped strip for better mechanical stability. Of course, the insulating support strip can also be a square or other shaped strip, as long as it serves a supporting and insulating function.

[0041] As shown in Figures 5-13, the high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320, and a high-voltage insulation layer 1330. A conductor is wound around the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 includes a winding portion 1312, in which a conductor is wound to form the high-voltage coil 1320. The high-voltage coil 1320 includes several coil segments, which are spaced apart along the axial direction of the winding body 1310.

[0042] The winding section 1312 includes several winding plates 1313. These winding plates 1313 are arranged along the axial direction of the winding body 1310 and are evenly distributed circumferentially along the winding body 1310. Several winding grooves 1314 are provided on each winding plate 1313, forming several comb-like teeth on one side for winding the conductor. Several support portions 1315 are provided on the other side of the winding plate 1313 where no comb-like teeth are provided, for abutting against the winding fixture. The number of winding plates 1313 is at least two, but can be two, three, or more; no limitation is made here. To ensure secure conductor winding and to save material as much as possible, the number of winding plates 1313 in the 10kV / 1000kVA dry-type transformer is set to twelve.

[0043] The winding plate 1313 is a rectangular plate. The longer side of the winding plate 1313 is arranged along the axial direction of the winding body 1310. Several winding slots 1314 on the winding plate 1313 are arranged radially along the winding body 1310 and spaced apart along the axial direction of the winding body 1310, so that several 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 tap joint of the tap connector needs to be led out from the middle of the winding plate 1313. Setting the tooth height in the middle of the winding plate 1313 to be larger will result in a larger distance between two adjacent winding slots 1314, which can leave space for the tap joint 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 less than the length of the comb teeth in other parts, which can leave space for the taps led out from the middle of the winding plate 1313.

[0044] At least one coil segment is provided between two adjacent comb teeth on the winding plate 1313, so that each winding slot 1314 is wound with a wire, and the high-voltage coils 1320 are reasonably distributed, with each coil segment spaced apart. Specifically, when several winding plates 1313 are evenly distributed circumferentially, the winding slots 1314 on all winding plates 1313 correspond one-to-one with the winding body 1310 circumferentially. Each coil segment is wound with a wire along the circumference of the winding body 1310 in the corresponding winding slot 1314 on all winding plates 1313, resulting in balanced force and good mechanical strength.

[0045] In other embodiments, to allow for the placement of the taps, the winding plates can be arranged unevenly. For example, the distance between two adjacent winding plates may be greater than the distance between any other two adjacent winding plates. In this case, each tap is led out from between the two adjacent winding plates. Thus, the tooth height of the comb teeth in the middle of the winding plate does not need to be set to be larger, and the placement position of each tap can still be left.

[0046] Several support portions 1315 are disposed on the other side of the winding plate 1313, that is, the support portions 1315 and the comb teeth are respectively located on opposite sides of the winding plate 1313, and the several support portions 1315 are arranged radially along the winding body 1310 and spaced apart axially along the winding body 1310. The several support portions 1315 abut against the outer peripheral surface of the winding fixture, so that under the high temperature condition of forming the high voltage insulation layer 1330, the winding plate 1313 will not soften and deform due to high temperature, resulting in the high voltage coil 1320 lacking support, effectively avoiding the high voltage coil 1320 from inward deformation, and ensuring the quality of the high voltage winding 130. Furthermore, the support portion 1315 allows the distance between the bottom surface of the winding groove 1314 of the winding plate 1313 and the side of the winding plate 1313 without comb teeth to meet the strength design requirements without needing to be large. This reduces 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. Moreover, the size of the high-voltage winding 130 of the same voltage level can also be smaller, saving floor space.

[0047] 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 widths of the support portions 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 widths of the support portions 1315 in other parts of the winding plate 1313. This is because the ends of the winding plate 1313 need to be slotted to be fixed with the auxiliary component 1311. Setting the width of the support portion 1315 at the ends of the winding plate 1313 to be larger ensures that the slotting at the ends of the winding plate 1313 does not weaken its mechanical strength, and the support portion 1315 can provide sufficient support for the ends of the high-voltage coil 1320. For example, the support portion 1315 can be set to be connected to the winding groove 1 at the ends of the winding plate 1313. Position 314 corresponds to the support portion 1315, and one end of the support portion 1315 extends to be flush with the end face of the winding plate 1313. 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 slots 1314 is also relatively large. Setting the width of the support portion 1315 in the middle of the winding plate 1313 to be larger 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 slots 1314 in the middle of the winding plate 1313, that is, the width of the support portion 1315 can cover the two adjacent winding slots 1314.

[0048] Simultaneously, the area containing the wider support portion 1315 is defined as the wide support area, and the area containing the narrower support portion 1315 is defined as the narrow support area. Through this arrangement, the winding plate 1313, along the axial direction of the winding body 1310 from one end to the other, sequentially 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. Furthermore, the first wide support area and the third wide support area are symmetrically arranged about the second wide support area, and the first narrow support area and the second narrow support area are symmetrically arranged about the second wide support area. This makes the support of each support portion 1315 on the high-voltage coil 1320 more uniform and stable. Of course, asymmetrical arrangements are also possible; no specific restrictions are placed here.

[0049] Furthermore, at least a portion of the support portion 1315 is correspondingly disposed with the winding groove 1314. In one application scenario, each support portion 1315 in this part is correspondingly disposed with one winding groove 1314. For ease of description, the support portion 1315 in this part is defined as the first support portion, that is, this part of the support portion 1315 includes several first support portions. Each first support portion is disposed on the other side of the winding plate 1313 without comb teeth and is located between the extension lines of its corresponding two adjacent comb teeth. The width of each first support portion is approximately equal to the width of its 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 provided with first support portions in the above manner, so that the two areas can better support their corresponding coil segments through the first support portions, further avoiding the inward deformation of the high-voltage coil 1320. It is understood that the number and placement area of ​​the first support portions can be designed according to specific needs, and no specific restrictions are made here.

[0050] In another application scenario, at least a portion of the support portion 1315 is correspondingly disposed with at least two adjacent winding slots 1314. Each support portion 1315 in this portion is correspondingly disposed with at least two adjacent winding slots 1314. For ease of description, the support portion 1315 in this portion is defined as a second support portion, that is, this portion of the support portion 1315 includes a plurality of second support portions. Each second support portion is disposed on the other side of the winding plate 1313 without comb teeth and is located between the extension lines of the comb teeth at both ends of its corresponding plurality of winding slots 1314. The width of each second support portion is approximately equal to the sum of the width of its corresponding plurality of winding slots 1314 along the axial direction of the winding body 1310 and the tooth height of the comb teeth between its corresponding plurality of winding slots 1314. For example, one second support portion is disposed corresponding to two adjacent winding slots 1314. The second support portion is located between its corresponding two The second support portion is positioned between the extended lines of the comb teeth at both ends of each winding groove 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. Alternatively, a second support portion may be provided for three adjacent winding grooves 1314, located between the extended lines of the comb teeth at both ends of the three corresponding 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 configured in the above manner, so that these three areas can better support the two ends and the middle of the high-voltage coil 1320 through the second support portion, further preventing the high-voltage coil 1320 from inward deformation. It is understood that the number and placement area of ​​the second support portions can be designed according to specific needs and are not specifically limited here.

[0051] Furthermore, on each winding plate 1313, a support portion 1315 is provided for each pair of adjacent winding slots 1314. For example, one support portion 1315 is provided for every two adjacent winding slots 1314, or one support portion 1315 is provided for every three adjacent winding slots 1314. This reduces the number of support portions 1315, ensuring effective support for the high-voltage coil 1320 while simplifying the structure of the winding plate 1313 and facilitating manufacturing. The width and specific location of the support portion 1315 can be adjusted according to support requirements and are not specifically limited here.

[0052] With the above configuration, the support portions 1315 on each winding plate 1313 are generally serrated. When the winding portion 1312 is fixed on the winding fixture and the support portion 1315 abuts against the outer peripheral surface of the winding fixture, several spaced channels will be formed between the winding plate 1313 and the outer peripheral surface of the winding fixture. These channels can be used to flow silicone rubber material, resulting in a more uniform molding effect and higher efficiency. At the same time, compared with a winding plate without support portions 1315, where the side without comb teeth abuts against the outer peripheral surface of the winding fixture, the winding plate may be damaged due to directly bearing a large injection pressure. However, during the injection process, the silicone rubber material of the winding plate 1313 can flow from one side of the winding plate 1313 to the other side through the aforementioned channels, effectively buffering the impact of the silicone rubber material on the winding plate 1313 and preventing the winding plate 1313 from being damaged by a large injection pressure.

[0053] Furthermore, the support portion 1315 is smoothly connected to the winding plate 1313. That is, the cross-section of each support portion 1315 along the radial direction of the winding body 1310 is approximately trapezoidal. 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 are smoothly transitioned. This can improve the connection strength between the support portion 1315 and the winding plate 1313. It can also prevent the mechanical strength of the winding plate 1313 from being weakened when the width of the support portion 1315 is smaller than the width of the corresponding winding groove 1314. This would prevent the winding plate 1313 from being damaged due to the large injection pressure during the injection of the high-voltage insulation layer 1330.

[0054] In this embodiment, the winding plate 1313 is made of glass fiber impregnated with epoxy resin. Multiple layers of glass fiber cloth impregnated with epoxy resin are stacked to a certain thickness, then molded and cured to form a rectangular fiberglass plate. The winding groove 1314 and support portion 1315 are then machined to form the winding plate 1313. This method uses minimal material and saves costs. In other embodiments, a comb-shaped winding plate can also be integrally cast and cured to directly form the winding plate, simplifying the process. The material of the winding plate is the same as described above and will not be repeated.

[0055] The winding body 1310 also includes several auxiliary components 1311, which are arranged in a ring shape and spaced apart along the axial direction of the winding body 1310. The auxiliary components 1311 are snapped together with the winding plate 1313. This winding body 1310 eliminates the structure of a rigid insulating inner liner, resulting in better heat conduction of the high-voltage winding 130. It also eliminates the interface between the high-voltage insulation layer and the rigid insulating inner liner of the traditional high-voltage winding, thereby suppressing surface discharge of the rigid insulating inner liner, saving materials, and reducing costs.

[0056] The winding plate 1313 is fixedly disposed on the inner circumference of several auxiliary components 1311 along the axial direction of the auxiliary components 1311, so that the winding plate 1313 connects all the auxiliary components 1311 simultaneously, and the several winding plates 1313 are evenly distributed along the circumference of the auxiliary components 1311. The axial directions of the auxiliary components 1311, the winding portion 1312, the winding body 1310, and the high-voltage winding 130 are all in the same direction. The auxiliary component 1311 can be circular or elliptical, depending on the overall shape of the high-voltage winding 130. The auxiliary component 1311 can maintain the stable setting of the winding plate 1313, preventing the winding plate 1313 from moving or misaligning during the wire winding process and the injection of the high-voltage insulation layer 1330, which would cause the high-voltage coil 1320 to shift and affect the quality of the high-voltage winding 130. Compared to a winding structure that fixes the winding plate to the outside of the auxiliary component, this method, which uses the auxiliary component to provide support for the winding plate and high-voltage coil, requires manual grinding of each auxiliary component and winding fixture to ensure a tight fit and prevent the auxiliary component from shifting on the surface of the winding fixture, thus avoiding deformation of the high-voltage coil due to stress. The entire assembly process is too time-consuming and requires excessive manual effort. Due to the high labor cost, this application fixes the winding plate 1313 inside the auxiliary component 1311. The tension of the wire winding can tighten all the winding plates 1313 to the theoretical position on the outer periphery of the winding fixture. There is no need for the auxiliary component 1311 to provide corresponding support. Therefore, there is no need to grind the auxiliary component 1311 and the winding fixture one by one to achieve a stable assembly of the winding plate 1313 and the auxiliary component 1311. This greatly saves labor, improves assembly efficiency, and effectively prevents the winding part 1312 from moving on the surface of the winding fixture. This prevents the high voltage coil 1320 from deforming due to uneven injection pressure and ensures the quality of the high voltage winding 130.

[0057] The auxiliary component 1311 and the winding plate 1313 are respectively provided with corresponding slots, and the two are connected by engaging with each other through the matching slots. The inner surface of the auxiliary component 1311 is provided with a plurality of first slots 1316, which are evenly arranged along the circumference of the auxiliary component 1311, and the number of first slots 1316 is equal to the number of winding plates 1313; the winding plates 1313 are provided with a plurality of second slots 1317 on the side where the comb teeth are provided, which are spaced apart along the length of the winding plates 1313, and the number of second slots 1317 is equal to the number of auxiliary components 1311; the winding plates 1313 are respectively engaged in the first slots 1316 of the auxiliary components 1311 through the second slots 1317, so that the winding plates 1313 are evenly distributed circumferentially on the inner circumference of the auxiliary components 1311. Meanwhile, the first slots 1316 on all auxiliary components 1311 are matched one-to-one in the axial direction of the auxiliary component 1311, so that each winding plate 1313 can be set along the axial direction of the auxiliary component 1311, thereby allowing the wire to be 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 distributed at intervals in the axial direction of the winding part 1312, with balanced force and good mechanical strength.

[0058] In this embodiment, the plurality of auxiliary components 1311 includes two first auxiliary components 13111 and at least one second auxiliary component 13112. As shown in Figures 5, 7, and 8, the first auxiliary component 13111 is engaged at the end of the winding plate 1313, and one second auxiliary component 13112 is engaged at the middle of the winding plate 1313. In other embodiments, the number of first and second auxiliary components can be adjusted according to the design requirements of the high-voltage winding. For example, it may include two first auxiliary components, two or three or more second auxiliary components. The first auxiliary components are engaged at the end of the winding plate, and multiple second auxiliary components are engaged at intervals along the axial direction of the winding body at the middle of the winding plate; or the first auxiliary components may be engaged at the middle of the winding plate, and the second auxiliary components may be engaged at the end of the winding plate, as long as the comb tooth structure of the winding plate is adjusted accordingly, and no specific limitation is made here.

[0059] The inner surface of the first auxiliary component 13111 is provided with a plurality of first slots 1316, and a second slot 1317 is provided in the winding groove 1314 at the end of the winding plate 1313. The second slot 1317 is set 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 component 13111, the first auxiliary component 13111 can abut against the inner wall of the comb teeth at the end of the winding plate 1313, which can ensure a tighter connection between the first auxiliary component 13111 and the winding plate 1313, and does not affect the winding of the coil in the winding groove 1314 at the end of the winding plate 1313. The inner surface of the second auxiliary component 13112 is provided with a plurality of first slots 1316, and the top of the comb teeth in the middle of the winding plate 1313 is provided with a second slot 1317, so that when the winding plate 1313 is installed in the first slots 1316 of the second auxiliary component 13112, it does not affect the winding of the coil in the winding groove 1314 in the middle of the winding plate 1313.

[0060] The width of the first slot 1316 along the circumferential direction of the auxiliary component 1311 is defined as the slot width of the first slot 1316. The width of the second slot 1317 along the length 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, and the slot depth of the second slot 1317 matches the thickness of the auxiliary component 1311 at the first slot 1316, so that the winding plate 1313... The assembly with the auxiliary component 1311 is secure, which avoids the problem that the width of the first slot 1316 is less than the thickness of the winding plate 1313 or the depth of the second slot 1317 is less than the thickness of the auxiliary component 1311 at the first slot 1316, making it difficult to fix the winding plate 1313 on the auxiliary component 1311. It also avoids the problem that the winding plate 1313 cannot be stably matched and will fall off the inside of the auxiliary component 1311 when the width of the first slot 1316 is greater than the thickness of the winding plate 1313 or the depth of the second slot 1317 is greater than the thickness of the auxiliary component 1311 at the first slot 1316.

[0061] Furthermore, the winding plate 1313 is fixed to the auxiliary component 1311 by an adhesive. Specifically, the second slot 1317 of the winding plate 1313 is fixedly connected to the first slot 1316 of the auxiliary component 1311 by the adhesive, which makes the connection between the winding plate 1313 and the auxiliary component 1311 more stable. The adhesive is a two-component high-temperature resistant epoxy resin, but other adhesives can also be used. However, it is necessary to ensure that the adhesive can firmly bond the winding plate 1313 and the auxiliary component 1311, and the adhesive must be heat resistant to adapt to the high-temperature molding conditions of the high-voltage insulation layer 1330.

[0062] Furthermore, each first auxiliary component 13111 has several grooves 1318 on the side plate near the end of the comb teeth of the winding plate 1313. The grooves 1318 are connected to the first slots 1316 one by one and are also corresponding to the winding plates 1313 to accommodate the comb teeth at the end of the winding plate 1313. A plurality of grooves 1318 are radially arranged along the first auxiliary member 13111 and evenly distributed along the circumference of the first auxiliary member 13111. The grooves 1318 penetrate the plate surface of the first auxiliary member 13111, and the width of the grooves 1318 along the circumference of the first auxiliary member 13111 matches the thickness of the winding plate 1313. The depth of the grooves 1318 along the axial direction of the first auxiliary member 13111 matches the tooth height of the comb teeth at the end of the winding plate 1313. Thus, when the second slot 1317 at the end of the winding plate 1313 is fixedly connected to the first slot 1316 of the first auxiliary member 13111, the comb teeth at the end of the winding plate 1313 can be accommodated in the grooves 1318, and the two end faces of the winding plate 1313 are respectively flush with the plate surfaces of the two first auxiliary members 13111 that are far apart from each other. Compared to the winding section structure where the winding plate protrudes from the auxiliary plate, the structure of this application can effectively avoid the injection impact force generated when the high voltage insulation layer 1330 is injected outside the winding body 1310, which could impact the comb teeth at the end of the winding plate 1313, thereby causing the winding plate 1313 to shift or even be damaged, affecting the quality of the high voltage winding 130.

[0063] Furthermore, a plurality of flow grooves 1319 are provided on the inner side of the first auxiliary component 13111, so that during the molding process of the high-voltage insulation layer 1330, the 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 insulation layer 1330 to fully fill the gap between the winding portion 1312 and the high-voltage coil 1320, as well as both 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 component 1311, which can make the flow of silicone rubber raw material more uniform and improve the molding quality. In other embodiments, one, two, three or more flow grooves may be provided, or they may be arranged asymmetrically, without specific limitations.

[0064] The width of the auxiliary component 1311 along the radial direction of the winding body 1310 is defined as the width of the auxiliary component 1311, and the width of the winding plate 1313 along the radial direction of the winding body 1310 is defined as the width of the winding plate 1313. Since the first auxiliary component 13111 plays a major role in fixing the two ends of the winding plate 1313, and the second auxiliary component 13112 plays a secondary role in fixing the middle part of the winding plate 1313, the width of the first auxiliary component 13111 is set to be greater than the width of the second auxiliary component 13112. This can reduce the amount of material used and lower the cost while ensuring the stable assembly of the winding part 1312. The width of the first auxiliary component 13111 is approximately equal to the width of the winding plate 1313. This ensures the stable assembly of the winding section 1312, preventing damage to the winding plate 1313 due to excessive injection pressure during the injection of the high-voltage insulation layer 1330. It also provides some restraint to the coil wound in the winding groove 1314 at the end of the winding plate 1313, preventing wire displacement and affecting the quality of the high-voltage winding 130. The width of the second auxiliary component 13112 can be smaller than the width of the winding plate 1313, for example, it can be half or one-third of the width of the winding plate 1313. This allows it to assist in fixing the winding plate 1313 without affecting the tap of the high-voltage coil 1320 at the center of the winding plate 1313.

[0065] At least one set of winding plates 1313 is also provided with corresponding protrusions for abutting against the inner wall of the injection mold. Thus, when the winding body 1310 with the high-voltage coil 1320 wound on it is placed into the injection mold along with the winding fixture, on the one hand, the protrusions abutting against the injection mold can further support the winding part 1312, preventing the winding plates 1313 from loosening and shifting, which would affect 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 uniformly wraps the winding part 1312, ensuring the injection quality of the high-voltage insulation layer 1330.

[0066] Furthermore, all the winding plates 1313 with protrusions are symmetrically distributed along the central axis section of the winding body 1310, which can prevent the winding part 1312 from shifting due to uneven force when installed in the injection mold, thus affecting the injection quality of the high voltage insulation layer 1330. At least one set 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 with protrusions.

[0067] In one application scenario, as shown in Figure 9, at least one set of winding plates 1313 has a first protrusion 13131 at both ends. The first protrusion 13131 protrudes from the end face of the winding plate 1313 along the length direction of the winding plate 1313, that is, protrudes from the plate surface of the first auxiliary component 13111. When the winding body 1310 with the high voltage coil 1320 wound together with the winding fixture is placed into the injection mold, 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, preventing the winding plate 1313 from loosening and shifting, which would affect the quality of the high voltage winding 130. At the same time, it leaves space between the first auxiliary component 13111 and the inner wall of the end of the injection mold, which facilitates the flow of silicone rubber, thereby allowing the high voltage insulation layer 1330 to wrap around both ends of the winding part 1312. In this embodiment, the eight winding plates 1313 symmetrically arranged on both sides of the winding portion 1312 are provided with first protrusions 13131 at both ends. This ensures that the winding portion 1312 is subjected to more uniform force when installed in the injection mold, thus ensuring the support effect while reducing material usage and lowering costs. It is understood that the number and distribution of the first protrusions 13131 can be adjusted according to the support requirements.

[0068] In another application scenario, at least two comb teeth of at least one set of winding plates 1313 are provided with a second protrusion. The second protrusion is arranged radially along the winding plate 1313. When the winding body 1310 with the high voltage coil 1320 wound together with the winding fixture is placed into the injection mold, the second protrusion on the winding plate 1313 can abut against the inner peripheral wall of the injection mold, further supporting the winding part 1312, preventing the winding plate 1313 from loosening and shifting, thus affecting the quality of the high voltage winding 130. At the same time, it leaves a space between the outer peripheral surface of the winding part 1312 and the inner peripheral wall of the injection mold, which facilitates the flow of silicone rubber, thereby allowing the high voltage insulation layer 1330 to wrap around the outer peripheral surface of the winding part 1312.

[0069] Furthermore, on the same winding plate 1313, all the 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 tops of the four comb teeth symmetrically arranged along the central cross-section of the winding body 1310 on the winding plate 1313 are provided with second protrusions. All winding plates 1313 are provided with second protrusions and their positions are correspondingly matched, which can ensure that the winding part 1312 is subjected to more uniform force when installed in the injection mold. It is understood that the number and distribution position of the second protrusions can be adjusted according to the support requirements, and no specific limitation is made here.

[0070] In this embodiment, the auxiliary component 1311 is also made of glass fiber impregnated with epoxy resin. After multiple layers of glass fiber cloth are impregnated with epoxy resin and stacked to a certain thickness, they are molded and cured to form a fiberglass component. The winding plate 1313 and the auxiliary component 1311 are separately formed and then fixed by snap-fit ​​bonding.

[0071] The winding body 1310 is made of the aforementioned fiber-reinforced composite material, which has the characteristics of being lightweight and high-strength. This gives the winding body 1310 good mechanical strength, effectively supporting the winding of the conductor and preventing damage. It also avoids the conductor being scattered and displaced by the injection impact force generated when the high-voltage insulation layer 1330 is injected into the winding body 1310. Furthermore, the fiber-reinforced composite material has good heat resistance, preventing the winding body 1310 from deforming due to excessive heat generated by the high-voltage coil 1320 during the operation of the dry-type transformer 10.

[0072] As shown in Figure 10, to make the inner wall of the high-voltage winding 130 smoother and improve its insulation performance, the winding body 1310 also includes an inner liner 1340. The inner liner 1340 is a hollow cylindrical structure, with several winding plates 1313 evenly distributed circumferentially on its outer circumferential surface. The dimensions of the inner liner 1340 match the inner wall of the high-voltage winding 130, which saves material and reduces costs while ensuring the smoothness and flatness of the inner wall of the high-voltage winding 130.

[0073] The inner liner 1340 includes a support layer 1341 and a fusion layer 1342, which are closely attached to each other. The support layer 1341 is made of vulcanized silicone rubber, and the fusion layer 1342 is made of unvulcanized silicone rubber. The support layer 1341 can further enhance the support effect on the winding portion 1312. The fusion layer 1342 can be vulcanized together with the silicone rubber raw material of the high-voltage insulation layer 1330 during molding to exert its fusion effect, improve the fusion effect between the winding portion 1312 of the composite material and the high-voltage insulation layer 1330 of silicone rubber, improve the insulation performance of the inner wall of the high-voltage winding 130, and make the inner wall of the high-voltage winding 130 smoother and flatter.

[0074] Specifically, vulcanized silicone rubber is defined as cured rubber, and uncured silicone rubber is defined as raw rubber. The support layer 1341 is a cured rubber sheet of a certain thickness, and the fusion layer 1342 is a raw rubber sheet of a certain thickness. The specifications of the cured 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 inner wall length of the winding portion 1312, ensuring that the inner liner 1340 covers the inner wall of the high-voltage winding 130. By overlapping the sheet-like support layer 1341 and the sheet-like fusion layer 1342, butt-jointing and winding them to form a hollow cylindrical structure, the flexible inner liner 1340 can be obtained.

[0075] When assembling the winding body 1310, the corresponding sized and raw rubber sheets are first overlapped and wound onto the outer circumference of the winding fixture, and the two ends are joined together to form a hollow cylindrical structure, which forms the inner lining layer 1340. Then, the winding plate 1313 and the auxiliary part 1311 are snapped together and fixed to form a hollow winding part 1312. Finally, the assembled winding part 1312 is fitted onto the outer circumference of the inner lining layer 1340 to complete the assembly of the winding body 1310, which is ready for subsequent wire winding.

[0076] In this embodiment, since the raw rubber sheet has not yet been vulcanized, its surface is more easily scratched and damaged than that of the cured rubber sheet. Therefore, a support layer 1341 is provided on the outside of the inner liner layer 1340, and a fusion layer 1342 is provided on the inside of the inner liner layer 1340. That is, several winding plates 1313 are evenly distributed circumferentially on the outer circumferential surface of the cured rubber sheet, and the raw rubber sheet is attached to the outer circumferential surface of the winding fixture. On the one hand, this can prevent damage to the inner liner layer 1340 due to assembly gaps when the winding part 1312 is fitted onto the outer circumference of the inner liner layer 1340. The outer surface of 340 ensures the supporting effect of the inner liner 1340. On the other hand, before the high-voltage insulation 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 insulation layer 1330 are located on both sides of the cured rubber sheet of the support layer 1341. When the raw rubber is vulcanized at high temperature, it can fuse with the surface of the cured rubber to a certain extent, ensuring the fusion effect of the inner liner 1340. This improves the smoothness and flatness of the inner wall of the high-voltage winding 130 while enhancing its insulation performance. In other embodiments, the support layer can also be located on the inner side and the fusion layer on the outer side, as long as care is taken not to damage the surface of the inner liner during the winding assembly. No specific limitations are imposed here.

[0077] Furthermore, the inner liner 1340 also includes an intermediate layer. The support layer 1341, the intermediate layer, and the fusion layer 1342 are sequentially and tightly attached. The intermediate layer is made of glass fiber mesh or aramid fiber mesh, which can further improve the mechanical properties of the inner liner 1340 and enhance its support effect on the winding portion 1312. When preparing the inner liner 1340, the support layer 1341, the intermediate layer, and the fusion layer 1342 are sequentially overlapped and wound to form a hollow cylindrical structure.

[0078] Referring to Figures 5, 6, 9, 12, and 13, taking the A-phase transformer 100 as an example, conductors are circumferentially wound on the outer circumferential surface of the winding body 1310 to form a high-voltage coil 1320. Specifically, the conductors are wound in the winding grooves 1314 of the winding section 1312, so that the high-voltage coils 1320 are spaced apart along the axial direction of the winding body 1310. After the conductors are wound, two external connections are formed at their ends, namely the first external connection D and the second external connection X. The first external connection D is used to connect cables, and the second external connection X is used to connect other external connections, such as in a three-phase transformer, for interconnection with other phase transformers. The conductor has six taps leading out from the middle of the winding body 1310 along its axial direction. These taps are tap 2, tap 3, tap 4, tap 5, tap 6 and tap 7. The six taps form a tap switch. For ease of description, taps 2, 4 and 6 are defined as the first tap switch, and taps 3, 5 and 7 are defined as the second tap switch.

[0079] In one application scenario, the conductor includes a first conductor and a second conductor, both of which are continuous conductors. Both the first and second conductors are covered with an insulating layer, which can be a polyimide film, a fiberglass film, or other insulating materials such as polyester varnish, or a combination of multiple insulating materials; no limitation is made here. For ease 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 begins winding from the first end of the winding section 1312 to the second end of the winding section 1312. The first conductor is wound with the designed number of turns in the first winding slot 1314 corresponding to the first turn on all the winding plates 1313, forming the first segment coil 1321. The first segment coil 1321 is wound in a pancake pattern, with only one pancake coil in each winding slot 1314. At this time, each segment coil has only one pancake coil. The inner turn conductor end of the first segment coil 1321 (i.e., the beginning end of the first conductor) is the first external connection D. The outer turn conductor end of the first segment coil 1321 extends into the second winding slot 1314 corresponding to the first turn on all the winding plates 1313 and continues to wind to form the second segment coil 1322. This process continues until the first conductor winds to the middle of the winding body 1310 to form several segments of coil. Three taps are led out from the outer turn conductor ends of three of these segments, namely tap 6, tap 4, and tap 2 as shown in Figure 12. At this point, the winding of the first conductor is complete.

[0080] The second conductor is wound from the middle of the winding section 1312 along the axial direction of the winding body 1310 to the second end of the winding section 1312, and three additional taps are led out. Specifically, the second conductor begins to wind in the next winding groove 1314 adjacent to tap 2, forming the third coil segment 1323. The second conductor continues to wind towards the second end of the winding section 1312 in the same winding manner as the first conductor, forming several coil segments. During the winding process, three additional taps are led out from the three coil segments starting from the third coil segment 1323, namely tap 3, tap 5, and tap 7, until the second conductor winds to the last winding groove 1314 of the corresponding turn on each winding plate 1313 at the second end of the winding section 1312 and forms the terminal coil segment 1324. The outer turn of the terminal coil segment 1324 (i.e., the end of the second conductor) is the second external connector X, and the winding of the second conductor is now complete.

[0081] When the wire is wound, it is wound in a winding groove 1314 corresponding to all the winding plates 1313, so that each coil formed by the wire is perpendicular to the axis of the winding body 1310. The winding is convenient and the wire is neatly arranged. The winding plate 1313 is subjected to uniform force and has good mechanical strength.

[0082] Thus, a disc-shaped high-voltage coil 1320 is formed, which has good mechanical strength and strong resistance to the electrodynamic forces generated by short-circuit currents. Compared with a layered coil, it has more discs and better heat dissipation. Furthermore, in the axial direction of the winding body 1310, the first tap changer and the second tap changer are arranged parallel to each other, and the six taps form the tapping device of the high-voltage coil 1320, used by the dry-type transformer 10 to adjust the voltage according to different operating conditions. Of course, a layered coil can also be used in other embodiments.

[0083] The conductor is wound around the winding body 1310 to form a high-voltage coil 1320, which is thus loop-shaped. The loop width of the high-voltage coil 1320 is defined as its width. The width of the high-voltage coil 1320 is consistent in all its radial sections, ensuring overall force balance. Of course, considering practical operation, the widths of each coil in its radial section may not be exactly the same, as long as they are approximately the same.

[0084] In this embodiment, the tap changer includes six taps, so the dry-type transformer 10 has five adjustable voltage levels. In other embodiments, the tap changer may also include four taps, that is, the first tap changer and the second tap changer each include two taps, so the dry-type transformer has three adjustable voltage levels. As long as it meets the actual usage requirements of the dry-type transformer, it is acceptable and no limitation is imposed here.

[0085] As shown in Figures 9 and 11, the high-voltage insulation layer 1330 wraps around the high-voltage coil 1320 and the winding body 1310 to form the high-voltage winding 130.

[0086] In one embodiment, the high-voltage insulation layer 1330 is made of high-temperature vulcanized silicone rubber and is formed by injection molding. First, a conductor is wound around a winding body 1310 to form a high-voltage coil 1320. The winding body 1310 and the high-voltage coil 1320 are then used as the injection mold. The injection mold is filled with high-temperature vulcanized silicone rubber, and high-temperature vulcanized silicone rubber is injected into the outer periphery of the injection mold to obtain the high-voltage winding 130. The use of high-temperature vulcanized silicone rubber in the high-voltage insulation layer 1330 improves the overall insulation and mechanical properties of the high-voltage winding 130.

[0087] The high-temperature vulcanized silicone rubber of this application adopts a high-temperature vulcanized silicone rubber material system, specifically including raw rubber, reinforcing agent, flame retardant, heat resistant agent and other auxiliary materials.

[0088] In another embodiment, the high-voltage insulation layer 1330 can also be made of liquid silicone rubber, formed by casting or injection molding. When casting is used, the conductor is first wound around the winding body 1310 to form a high-voltage coil 1320. The winding body 1310 and the high-voltage coil 1320 are used as the casting body. The casting body is placed in a casting mold, and liquid silicone rubber is poured around the outer periphery of the casting body by adding silicone rubber material. After curing, the high-voltage winding 130 is obtained. When injection molding is used, the specific molding process is similar to the aforementioned injection process and will not be described again.

[0089] The liquid silicone rubber in this application adopts a liquid silicone rubber material system, specifically including base rubber, reinforcing agent, flame retardant, heat resistant agent and other auxiliary materials.

[0090] Under vacuum conditions, after the high-voltage coil 1320 and the winding body 1310 are covered with high-temperature vulcanized silicone rubber or liquid silicone rubber, the high-temperature vulcanized silicone rubber or liquid 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 hollow in shape as a whole. It can be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylindrical shapes.

[0091] Before the high voltage insulation layer 1330 is formed, tooling connectors can be set on the injection mold or casting mold. The tooling connectors have protective cavities corresponding to the six taps. The taps are fixed in the protective cavities, and the remaining space in the protective cavities is filled by bolts and other connectors, so as to prevent the six taps from being covered by silicone rubber during the injection or casting process and thus being unable to be used for wiring.

[0092] The high-voltage winding 130 of this application has a high-temperature vulcanized silicone rubber or liquid silicone rubber high-voltage insulation layer 1330 outside the high-voltage coil 1320. Compared with the epoxy resin high-voltage insulation layer in the prior art, it has the following advantages: 1) It has better fire resistance, low-temperature resistance, aging resistance and short-circuit test capability, 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 recyclability is greater than 99%, which is more environmentally friendly; 3) The silicone rubber elastomer can reduce the partial discharge caused by mechanical vibration, which has an inhibitory effect on equipment discharge, and the product of silicone rubber under discharge is non-conductive silicon dioxide, which can effectively inhibit the continued deterioration of insulation; 4) It can reduce the operating loss of the transformer and save energy; 5) It has better resistance to harsh environments and can be installed indoors and outdoors. Meanwhile, this application uses injection molding or casting process to integrally form the high-voltage insulation layer 1330, making it more stable, with higher mechanical properties, and better adhesion to the high-voltage coil 1320 and winding body 1310, which can effectively extend the service life of the high-voltage insulation layer 1330.

[0093] In this embodiment, as shown in FIG13, it is a partial cross-sectional view of the high-voltage winding 130 covered with a high-voltage insulation layer 1330 along its axial direction. The conductor is wound in a comb-shaped winding plate 1313 using the aforementioned winding method to form a disc-shaped high-voltage coil 1320. Along the axial direction of the high-voltage winding 130, the disc-shaped high-voltage coil 1320 and the comb teeth of the winding plate 1313 are spaced apart, that is, a disc coil is provided between two adjacent comb teeth. In other embodiments, the conductor can also be wound using other methods to form the high-voltage coil, as long as the structure of the winding part is adjusted accordingly. For example, when increasing the width of the winding slot on the winding plate 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. No specific limitation is made here.

[0094] The technical content and features of this application have been disclosed above. However, it is understood that, based on the inventive concept of this application, those skilled in the art can make various changes and improvements to the above-described structure and materials, including combinations of the technical features disclosed or claimed herein, and explicitly including other combinations of these features. All such modifications and / or combinations fall within the technical field to which this application pertains and are within the scope of protection of the claims of this application.

Claims

1. A winding body of a high voltage winding, characterized in that The winding body includes an inner liner and several winding plates. The inner liner is a flexible hollow cylindrical structure. The length direction of the several winding plates is arranged along the axial direction of the winding body. The several winding plates are evenly distributed circumferentially on the outer circumferential surface of the inner liner. Several winding grooves are provided on the winding plates for winding wires.

2. The winding body of a high voltage winding as claimed in claim 1, characterized in that The winding body also includes several auxiliary components, which are arranged in a ring shape and spaced apart along the axial direction of the winding body. The auxiliary components are engaged with the winding plate.

3. The winding body of the high voltage winding according to claim 1, characterized in that, The inner lining layer includes a support layer and a fusion layer, which are disposed in close contact with each other.

4. The winding body of a high voltage winding as claimed in claim 3, characterized in that The specifications of the inner lining layer are matched with the inner wall of the high-voltage winding.

5. The winding body of the high voltage winding according to claim 3, characterized in that, The support layer is made of vulcanized silicone rubber, and the fusion layer is made of unvulcanized silicone rubber.

6. The winding body of a high voltage winding as claimed in claim 3, characterized in that The support layer is located outside the fusion layer, and a plurality of the winding plates are circumferentially distributed on the outer circumferential surface of the support layer.

7. The winding body of a high voltage winding according to claim 3, characterized in that The fusion layer is located outside the support layer, and a plurality of the winding plates are circumferentially distributed on the outer circumferential surface of the fusion layer.

8. The winding body of a high voltage winding according to claim 3, characterized in that The inner lining layer also includes an intermediate layer, and the support layer, the intermediate layer, and the fusion layer are sequentially and closely attached to each other.

9. The winding body of a high voltage winding according to claim 8, characterized in that The intermediate layer is made of glass fiber mesh or aramid fiber mesh.

10. A high voltage winding, characterized by The high-voltage winding includes a winding body as described in any one of claims 1 to 9, wherein a conductor is wound on the winding body to form a high-voltage coil, the high-voltage coil is entirely covered by a high-voltage insulation layer, and the high-voltage insulation layer covers both ends of the winding body.

11. The high voltage winding of claim 10, wherein, The high-voltage insulation layer is made of high-temperature vulcanized silicone rubber or liquid silicone rubber.

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