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

Abstract

The utility model discloses a winding body of a high-voltage winding, which comprises a lining layer, the lining layer is of a flexible hollow cylindrical structure, and the specification of the lining layer is matched with that of the inner wall of the high-voltage winding. The utility model further discloses the high-voltage winding. By arranging the flexible lining layer, the inner wall of the high-voltage winding is smoother and smoother, and meanwhile the insulation performance of the high-voltage winding is improved.

Description

TECHNICAL FIELD

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

[0002] At present, transformers can be divided into oil-immersed transformers, dry-type transformers and gas transformers. Dry-type transformers have the advantages of no oil, fire prevention, long service life, energy saving, low noise, simple maintenance, safety and reliability. Most of the dry-type transformers on the current market are resin-encapsulated high-voltage winding dry-type transformers and open dry-type transformers. Although dry-type transformers have developed a lot in the past 10 years, there are still problems such as insulation cracking, poor heat conduction and harsh operating environment.

[0003] The winding structure of the high-voltage winding of the current dry-type transformer usually adopts two kinds, one is formed by bonding a rigid support cylinder and a rigid comb plate, which is simple and reliable in structure, but the material cost is relatively high; the other is formed by clamping a rigid comb plate and a ring-shaped support strip, a plurality of comb plates are clamped on the outer periphery of the ring-shaped support strip arranged at intervals to form a winding framework, and then the winding framework is sleeved on a winding tool and wound with a conductor to form a high-voltage coil, and then put into an injection mold to form a high-voltage winding by high-temperature injection of silicone rubber. Since the winding framework is pressed against the outer periphery of the winding tool, when the high-voltage insulation layer is injected, the inner wall of the auxiliary part of the winding body will be partially exposed, which reduces the flatness of the inner wall of the high-voltage winding and affects the insulation performance of the inner wall of the high-voltage winding. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, one of the purposes of the present application is to provide a winding body of a high-voltage winding, which improves the insulation performance of the high-voltage winding by providing a flexible inner lining layer to make the inner wall of the high-voltage winding smoother and more uniform.

[0005] To achieve the above-mentioned purposes, the technical solution adopted by the present application is as follows: a winding body of a high-voltage winding, comprising an inner lining layer, the inner lining layer being a flexible hollow cylindrical structure, the specification of the inner lining layer being matched with the inner wall of the high-voltage winding.

[0006] Among them, the inner lining layer comprises a support layer and a fusion layer, and the support layer and the fusion layer are arranged in close contact.

[0007] Among them, the support layer is made of vulcanized silicone rubber, and the fusion layer is made of unvulcanized silicone rubber.

[0008] Among them, the support layer is located on the outer side of the fusion layer.

[0009] Among them, the sheet-shaped support layer and the sheet-shaped fusion layer are overlapped and butt-jointed to form a hollow cylindrical structure.

[0010] Among them, the inner lining layer further comprises an intermediate layer, and the support layer, the intermediate layer and the fusion layer are arranged in close contact in sequence.

[0011] The intermediate layer is made of glass fiber mesh cloth or aramid fiber mesh cloth.

[0012] The winding body further comprises a plurality of winding plates, the length direction of the plurality of winding plates is arranged along the axial direction of the winding body, and the plurality of winding plates are uniformly distributed on the outer circumferential surface of the inner lining layer in the circumferential direction.

[0013] The winding body further comprises a plurality of auxiliary members, the plurality of auxiliary members are annular and arranged in the axial direction of the winding body at intervals, the auxiliary members are connected with the winding plates in a clamping manner, and the winding plates are arranged on the inner circumferences of the auxiliary members.

[0014] The second purpose of the present application is to provide a high-voltage winding, which comprises the winding body of the high-voltage winding described above, the conductors are wound on the winding body to form a high-voltage coil, and the high-voltage coil is coated with a high-voltage insulation layer.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the inner lining layer is arranged on the inner side of the winding plate, the inner lining layer comprises a support layer and a fusion layer arranged in close contact, the support layer can further strengthen the support effect on the winding part, and the high-voltage coil is prevented from being deformed inwardly; the fusion layer can be vulcanized together with the raw material of the high-voltage insulation layer of silicone rubber during injection molding, play 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 more smooth and flat while improving the insulation performance.

[0016] In addition, the inner lining layer of the present application further comprises an intermediate layer, which can further improve the mechanical properties of the inner lining layer and improve the support effect on the winding part. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the front view of the dry-type transformer 10 of an embodiment of the present application;

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

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

[0020] Figure 4 is Figure 2 is an enlarged view of the middle G;

[0021] Figure 5 is the perspective view of the winding body 1310 of an embodiment of the present application;

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

[0023] Figure 7is a perspective view of a first auxiliary member 13111 according to an embodiment of the present application;

[0024] Figure 8 is a perspective view of a second auxiliary member 13112 according to an embodiment of the present application;

[0025] Figure 9 is a perspective view of a high voltage coil 1320 wound on the winding body 1310 according to an embodiment of the present application;

[0026] Figure 10 is a partial perspective view of a high voltage coil 1320 wound on the winding body 1310 according to another embodiment of the present application;

[0027] Figure 11 is a perspective view of a high voltage winding 130 according to an embodiment of the present application;

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

[0029] Figure 13 is a partial sectional view of a high voltage winding 130 according to an embodiment of the present application. DETAILED DESCRIPTION

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

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

[0032] As Figures 1-3As shown, the dry-type transformer 10 is a three-phase transformer, which is respectively A-phase, B-phase and C-phase, namely the dry-type transformer 10 comprises three single-phase transformers 100. According to the structure of the core 110, the three transformers 100 can be arranged to form a linear type or a triangular structure, and the three transformers 100 are in a symmetrical structure. In addition, the dry-type transformer 10 can also be an isolation transformer, a frequency conversion transformer, a test transformer, etc.

[0033] In an embodiment, continuing to refer to Figures 1-3 , the three transformers 100 are arranged to form a linear structure, and the dry-type transformer 10 comprises the core 110, three low-voltage windings 120 and three high-voltage windings 130. The core 110, the low-voltage windings 120 and the high-voltage windings 130 are sequentially arranged from inside to outside. The core 110 comprises three columnar core bodies 111, an upper yoke 112 located at the upper end of the three columnar core bodies 111 and a lower yoke 113 located at the lower end of the three columnar core bodies 111, the three low-voltage windings 120 are respectively sleeved on the outer periphery of the three columnar core bodies 111, and the three high-voltage windings 130 are respectively sleeved on the outer periphery of the three low-voltage windings 120, namely the three columnar core bodies 111, the three low-voltage windings 120 and the three high-voltage windings 130 are sequentially and one-to-one corresponding sleeved from inside to outside. The columnar core body 111 is made of a plurality of layers of silicon steel sheets, which are fixed by binding with a binding tape. The radial cross section of the columnar core body 111 is approximately oval or circular or other shapes, as long as it can be accommodated in the hollow cavity of the low-voltage winding 120, which is not limited here. The upper yoke 112 and the lower yoke 113 are also made of a plurality of layers of silicon steel sheets, which are fixedly connected to the three columnar core bodies 111, thereby forming a three-phase core 110 as shown in Figure 3 .

[0034] As shown in Figure 1 and Figure 2 , the outer side of the core 110 is provided with a core clamp 140, which is formed by three clamps connected to each other to form a structure similar to a channel steel, namely the core clamp 140 as a whole is in a "Fang" type structure. Of course, in other embodiments, the core clamp can also be a hollow pipe, namely the core clamp is formed by a plurality of clamps of plate structure connected to each other and surrounded to form a closed structure, so that the structure of the core clamp is more stable.

[0035] Among them, the core clamp 140 is made of fiber-reinforced composite material, which can be molded by impregnating glass fiber with epoxy resin, or molded by impregnating aramid fiber with epoxy resin, or can be integrally formed by other composite materials, which is not limited here.

[0036] The fiber reinforced composite material refers to a composite material formed by a reinforcing fiber material such as glass fiber, aramid fiber and the like and a matrix material through winding, molding or pultrusion forming process and the like. The iron core clamp 140 made of the fiber reinforced composite material has low cost, light weight, good mechanical properties, and low carbon emission in the production process, and is more green and environmentally friendly.

[0037] In combination Figure 2 And Figure 4 As shown in the drawings, the low-voltage winding 120 includes copper foil 121, low-voltage insulation layer 122 and support strip 123, and the copper foil 121 and the low-voltage insulation layer 122 are arranged alternately. Specifically, the copper foil 121 is formed by winding the whole copper foil paper, and the low-voltage insulation layer 122 is arranged in overlap with the copper foil 121 and is wound together. At least one heat dissipation air duct is provided in the low-voltage winding 120, which is located between adjacent copper foil 121 and low-voltage insulation layer 122, and the support strip 123 is located in the heat dissipation air duct and is used to support and isolate adjacent copper foil 121 and low-voltage insulation layer 122. The support strip 123 is an insulating support strip 123, and a plurality of insulating support strips 123 are provided in each layer of heat dissipation air duct, and the plurality of insulating support strips 123 are arranged in a circumferential direction of the outer circumferential surface of the copper foil 121 and are spaced apart, which simultaneously plays a role of supporting adjacent copper foil 121 and low-voltage insulation layer 122. The insulating support strips 123 arranged in each layer of heat dissipation air duct are at least two, which can be two, three, four or more. Preferably, the plurality of insulating support strips 123 of the same layer are uniformly and spaced apart in the circumferential direction of the outer circumferential surface of the copper foil 121. The arrangement of the heat dissipation air duct can release the heat generated by the low-voltage winding 120 during the operation of the dry-type transformer 10, and can avoid overheating failure. Wherein, the heat dissipation air duct can be provided with one layer, or two or more layers, which is not limited here.

[0038] Wherein, the low-voltage insulation layer 122 adopts polyimide impregnated paper, which can be SHS-P diphenyl ether pre-impregnated material, which is made by baking after impregnating diphenyl ether resin with polyimide film and polysulfone fiber non-woven soft composite material. Of course, the low-voltage insulation layer can also use DMD insulating paper or silicone rubber film, or other insulating materials, which can be selected according to different temperature rise grades of the dry-type transformer.

[0039] Wherein, the insulating support strip 123 is made of glass fiber impregnated epoxy resin, or made of aramid fiber impregnated epoxy resin, which is not limited here. And the insulating support strip 123 is a long strip with a cross-section in the shape of an I-beam, which has more stable mechanical strength. Of course, the insulating support strip can also be a long strip with a cross-section in the shape of a square or other shapes, as long as it can play a supporting and isolating role.

[0040] As Figures 5-13As shown, the high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320, and a high-voltage insulation layer 1330. The high-voltage coil 1320 is formed by winding a wire on the winding body 1310. The winding body 1310 includes a winding portion 1312, and the high-voltage coil 1320 is formed by winding the wire in the winding portion 1312. 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 portion 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 uniformly distributed along the circumferential direction of the winding body 1310. A plurality of winding grooves 1314 are arranged on the winding plate 1313 to form a plurality of comb teeth on one side of the winding plate 1313, which are used for winding the wire. A plurality of support portions 1315 are arranged on the other side of the winding plate 1313, which are used for abutting the winding tool. The number of the winding plate 1313 is at least two, which can be two, three, or more, and is not limited herein. In order to make the wire winding firm and save materials as much as possible, the number of the winding plate 1313 of the 10kV / 1000kVA dry-type transformer is set to twelve.

[0042] 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. The plurality of winding grooves 1314 on the winding plate 1313 are arranged along the radial direction of the winding body 1310 and spaced apart along the axial direction of the winding body 1310, so that the one side of the winding plate 1313 forms a plurality of comb teeth. 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, because the middle of the winding plate 1313 needs to lead out the tap of the tap line. If the tooth height of the middle of the winding plate 1313 is set to be larger, the distance between the corresponding adjacent two winding grooves 1314 is larger, which can leave space for the tap led out from the middle of the winding plate 1313. Further, the radial length of the comb teeth in the middle of the winding plate 1313 is smaller than the length of the comb teeth in other parts, which can leave space for the tap led out from the middle of the winding plate 1313.

[0043] At least one coil segment is arranged between the adjacent two comb teeth on the winding plate 1313, so that the wire is wound in each winding groove 1314, the high-voltage coil 1320 is reasonably distributed, and each coil segment is spaced apart. Specifically, when the plurality of winding plates 1313 are uniformly distributed in the circumferential direction, the winding grooves 1314 on all the winding plates 1313 are one-to-one corresponding and matched in the circumferential direction of the winding body 1310. Each coil segment is wound by the wire in a corresponding circle of winding grooves 1314 on all the winding plates 1313 in the circumferential direction of the winding body 1310, so that the stress is balanced and the mechanical strength is good.

[0044] In other embodiments, in order to let the setting position of the tap, several winding plates can also be unevenly arranged, such as the distance between any two adjacent winding plates is greater than the distance between any other two adjacent winding plates, at this time the teeth of the comb teeth in the middle of the winding plate do not need to be set larger, and the setting position of each tap can also be left.

[0045] Several support portions 1315 are arranged on the other side of the winding plate 1313, that is, the support portions 1315 and the comb teeth are respectively located on the opposite sides of the winding plate 1313, and the several support portions 1315 are arranged along the radial direction of the winding body 1310 and are spaced apart along the axial direction of the winding body 1310. The several support portions 1315 abut against the outer circumferential surface of the winding tool, so that under the high temperature condition of injection molding of the high-voltage insulation layer 1330, the winding plate 1313 will not soften and deform due to high temperature, causing the high-voltage coil 1320 to lack support, effectively avoiding the high-voltage coil 1320 from deforming inwardly, and ensuring the quality of the high-voltage winding 130. In addition, the arrangement of the support portions 1315 makes the 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 arranged not need to be set too large to meet the strength design requirement, so that the space required by the winding portion 1312 can be reduced, and then the amount of wire required by the high-voltage coil 1320 and the amount of silicone rubber required by the high-voltage insulation layer 1330 can be reduced, effectively reducing the cost, and the size of the high-voltage winding 130 of the same voltage level can also be smaller, saving the floor area.

[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 slotted to be fixed with the auxiliary member 1311. The width of the support portion 1315 at the end of the winding plate 1313 is set to be larger, which can ensure that the slotting of the end of the winding plate 1313 does not weaken its mechanical strength, and the support portion 1315 can provide sufficient support to the end of the high-voltage coil 1320. For example, the support portion 1315 can be arranged to correspond to the position of the winding slot 1314 at the end of the winding plate 1313, and one end of the support portion 1315 can extend to the same level as the end surface of the winding plate 1313. Since the comb teeth in the middle of the winding plate 1313 have a large tooth height, the distance between the two adjacent winding slots 1314 is also 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 to the middle of the high-voltage coil 1320. For example, the support portion 1315 can be arranged to correspond to the position of the 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.

[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 setting, the winding plate 1313 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 from one end to the other end along the axial direction of the winding body 1310. Further, 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. In this way, the support of each support portion 1315 to the high-voltage coil 1320 is more uniform and stable. Of course, it can also be asymmetrically arranged, which is not specifically limited here.

[0048] Further, at least part of the support portions 1315 are arranged corresponding to the winding grooves 1314. In an application scenario, each of the support portions 1315 in the part is arranged corresponding to one winding groove 1314. For the convenience of description, the support portions 1315 in the part are defined as first support portions, that is, the part of the support portions 1315 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 between the extension lines of the adjacent two 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 region and the second narrow support region on the winding plate 1313 are both arranged with the first support portions in the above manner, so that the two regions can be better supported by the first support portions corresponding to a section of the coil, further avoiding the deformation of the high-voltage coil 1320. It can be understood that the number and arrangement region of the first support portions are not specifically limited.

[0049] In another application scenario, at least part of the support portions 1315 are arranged corresponding to at least two adjacent winding grooves 1314. Each of the support portions 1315 in the part is arranged corresponding to at least two adjacent winding grooves 1314. For the convenience of description, the support portions 1315 in the part are defined as second support portions, that is, the part of the support portions 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 between the extension lines of the comb teeth at the two ends of the corresponding plurality of winding grooves 1314, and the width of each second support portion is substantially 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, one second support portion is arranged corresponding to two adjacent winding grooves 1314, the second support portion is located between the extension lines of the comb teeth at the two ends of the corresponding two winding grooves 1314, and the width of the second support portion is substantially 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, one second support portion is arranged corresponding to three adjacent winding grooves 1314, the second support portion is located between the extension lines of the comb teeth at the two ends of the corresponding three winding grooves 1314, and the width of the second support portion is substantially 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 region, the second wide support region, and the third wide support region are all arranged with the second support portions in the above manner, so that the three regions can be better supported by the second support portions corresponding to the two ends and the middle of the high-voltage coil 1320, further avoiding the deformation of the high-voltage coil 1320. It can be understood that the number and arrangement region of the second support portions can be designed according to specific requirements, which are not specifically limited herein.

[0050] Further, on each winding plate 1313, a plurality of adjacent winding grooves 1314 correspondingly arranged a support part 1315, for example, every two adjacent winding grooves 1314 correspondingly arranged a support part 1315, or every three adjacent winding grooves 1314 correspondingly arranged a support part 1315, so as to reduce the number of support parts 1315, while ensuring the support effect of the high-voltage coil 1320, the structure of the winding plate 1313 is simpler, and the production and manufacturing are facilitated. The width and specific setting position of the support part 1315 can be adjusted according to the support requirement, which is not limited here.

[0051] Through the above setting, the plurality of support parts 1315 on each winding plate 1313 integrally present a sawtooth structure. When the winding part 1312 is fixed on the winding tool, and the support part 1315 abuts against the outer peripheral surface of the winding tool, a plurality of spaced channels will be formed between the winding plate 1313 and the outer peripheral surface of the winding tool, which can be used for circulating the injected silicone rubber raw material, so that the injection effect is more uniform and the efficiency is higher. Compared with the winding plate without the support part 1315, the side without the comb teeth of the winding plate abuts against the entire outer peripheral surface of the winding tool. The winding plate may be damaged due to directly bearing a large injection pressure. In 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 winding plate 1313 from being damaged by a large injection pressure.

[0052] Further, the support part 1315 and the winding plate 1313 are smoothly connected, that is, the cross section of each support part 1315 along the radial direction of the winding body 1310 is substantially trapezoidal. The lower base of the trapezoid is connected with the side of the winding plate 1313, and the waist of the trapezoid and the side of the winding plate 1313 are smoothly transitioned, which can improve the connection strength between the support part 1315 and the winding plate 1313. When the width of the support part 1315 is less than the width of the winding groove 1314 corresponding to it, the distance between the bottom surface of the winding groove 1314 and the other side surface of the winding plate 1313 where the support part 1315 is arranged is too small, which weakens the mechanical strength of the winding plate 1313, and the winding plate 1313 is difficult to withstand the large injection pressure in the process of injecting the high-voltage insulating layer 1330 and is damaged.

[0053] In the present embodiment, the winding plate 1313 is made of glass fiber impregnated with epoxy resin. After a plurality of layers of glass fiber cloth are impregnated with epoxy resin and stacked to a certain thickness, a rectangular glass steel plate part is formed by mold curing, and the winding grooves 1314 and the support parts 1315 are formed by turning, thereby forming the winding plate 1313. The material is most economical, and the cost can be saved. In other embodiments, the comb-shaped winding plate can be directly formed by integral casting and curing, which simplifies the process, and the material of the winding plate is consistent with the foregoing, which will not be described again.

[0054] The winding body 1310 further comprises a plurality of auxiliary members 1311 arranged in a ring shape and spaced along the axial direction of the winding body 1310, and the auxiliary members 1311 are clamped and connected with the winding plate 1313. The winding body 1310 eliminates the structure of the rigid insulating inner liner, so that the heat conduction effect of the high-voltage winding 130 is better, the interface between the high-voltage insulating layer of the traditional high-voltage winding and the rigid insulating inner liner is eliminated, thereby suppressing the surface discharge of the rigid insulating inner liner, and saving materials and reducing costs.

[0055] The winding plate 1313 is fixedly arranged along the axial direction of the auxiliary member 1311 at the inner periphery of the plurality of auxiliary members 1311, so that the winding plate 1313 simultaneously connects all the auxiliary members 1311, and the plurality of winding plates 1313 are uniformly distributed along the circumferential direction of the auxiliary member 1311. Among them, the axial direction of the auxiliary member 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 in the same direction. The auxiliary member 1311 can be a circular ring or an elliptical ring, which can be designed according to the overall shape of the high-voltage winding 130. The auxiliary member 1311 can keep the stable arrangement of the winding plate 1313, avoid the movement and dislocation of the winding plate 1313 during the wire winding process and the injection process of the high-voltage insulating layer 1330, cause the high-voltage coil 1320 to deviate, and affect the quality of the high-voltage winding 130; compared with the winding body structure in which the winding plate is fixed outside the auxiliary member, the winding plate and the high-voltage coil are supported by the auxiliary member, and the auxiliary member and the winding tool need to be manually matched one by one, so that the auxiliary member and the winding tool can be tightly connected to prevent the auxiliary member from moving on the surface of the winding tool and causing the high-voltage coil to deform under stress. The entire assembly process is time-consuming and labor-intensive. In the present application, the winding plate 1313 is fixed inside the auxiliary member 1311, and the tension of the wire winding can tighten all the winding plates 1313 to the theoretical position outside the winding tool, without the auxiliary member 1311 providing corresponding support. Therefore, it is not necessary to match the auxiliary member 1311 and the winding tool one by one to realize the stable assembly of the winding plate 1313 and the auxiliary member 1311, which greatly saves labor, improves assembly efficiency, and effectively avoids the movement of the winding part 1312 on the surface of the winding tool, thereby preventing the high-voltage coil 1320 from deforming under stress due to uneven injection pressure and ensuring the quality of the high-voltage winding 130.

[0056] The auxiliary piece 1311 and the winding plate 1313 are correspondingly provided with clamping grooves, and are connected by the clamping grooves matched with each other. The inner surface of the auxiliary piece 1311 is provided with a plurality of first clamping grooves 1316, and the plurality of first clamping grooves 1316 are uniformly arranged along the circumference of the auxiliary piece 1311, and the number of the first clamping grooves 1316 is equal to the number of the winding plates 1313. The side of the plurality of winding plates 1313 provided with the comb teeth is correspondingly provided with a plurality of second clamping grooves 1317, and the plurality of second clamping grooves 1317 are arranged at intervals along the length direction of the winding plate 1313, and the number of the second clamping grooves 1317 is equal to the number of the auxiliary pieces 1311. The plurality of winding plates 1313 are correspondingly clamped in the first clamping grooves 1316 of the plurality of auxiliary pieces 1311 through the second clamping grooves 1317, so that the plurality of winding plates 1313 are uniformly distributed in the inner circumferences of the plurality of auxiliary pieces 1311 in the circumferential direction. At the same time, the first clamping grooves 1316 on all the auxiliary pieces 1311 are one-to-one matched in the axial direction of the auxiliary piece 1311, so that each winding plate 1313 can be arranged in the axial direction of the auxiliary piece 1311, and then the wires are wound in the comb teeth of the winding plate 1313 to form the high-voltage coil 1320, that is, the plurality of sections of the high-voltage coil 1320 are arranged at intervals in the axial direction of the winding part 1312, and the stress is balanced, and the mechanical strength is good.

[0057] In the embodiment, the plurality of auxiliary pieces 1311 include two first auxiliary pieces 13111 and at least one second auxiliary piece 13112, and the first auxiliary piece 13111 is clamped at the end of the winding plate 1313, and the second auxiliary piece 13112 is clamped at the middle of the winding plate 1313. Figure 5 Figure 7 and Figure 8 As shown in Figs. 1 to 3, the first auxiliary piece 13111 is clamped at the end of the winding plate 1313, and the second auxiliary piece 13112 is clamped at the middle of the winding plate 1313. In other embodiments, the number of the first auxiliary piece and the second auxiliary piece can be adjusted according to the design requirements of the high-voltage winding, for example, two first auxiliary pieces, two or three or more second auxiliary pieces, the first auxiliary piece is clamped at the end of the winding plate, and a plurality of second auxiliary pieces are clamped at the middle of the winding plate in the axial direction of the winding body; and the first auxiliary piece can also be clamped at the middle of the winding plate, and the second auxiliary piece can also be clamped at the end of the winding plate, as long as the comb tooth structure of the winding plate is correspondingly adjusted, which is not limited specifically herein.

[0058] ​The inner surface of the first auxiliary member 13111 is provided with a plurality of first clamping grooves 1316, and the winding groove 1314 at the end of the winding plate 1313 is provided with a second clamping groove 1317, so that when the winding plate 1313 is installed in the first clamping groove 1316 of the first auxiliary member 13111, the first auxiliary member 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 member 13111 and the winding plate 1313 is more secure, 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 member 13112 is provided with a plurality of first clamping grooves 1316, and the top of the comb teeth in the middle of the winding plate 1313 is provided with a second clamping groove 1317, so that when the winding plate 1313 is installed in the first clamping groove 1316 of the second auxiliary member 13112, it does not affect the winding of the coil in the winding groove 1314 in the middle of the winding plate 1313.

[0059] The width of the first clamping groove 1316 along the circumferential direction of the auxiliary member 1311 is defined as the groove width of the first clamping groove 1316, the width of the second clamping groove 1317 along the length direction of the winding plate 1313 is defined as the groove depth of the second clamping groove 1317, and the width of the winding plate 1313 along the circumference of the winding body 1310 is defined as the thickness of the winding plate 1313. The groove width of the first clamping groove 1316 matches the thickness of the winding plate 1313, and the groove depth of the second clamping groove 1317 matches the thickness of the auxiliary member 1311 at the first clamping groove 1316, so that the winding plate 1313 and the auxiliary member 1311 are firmly assembled, avoiding the situation that when the groove width of the first clamping groove 1316 is less than the thickness of the winding plate 1313 or the groove depth of the second clamping groove 1317 is less than the thickness of the auxiliary member 1311 at the first clamping groove 1316, the winding plate 1313 is difficult to fix on the auxiliary member 1311, and also avoiding the situation that when the groove width of the first clamping groove 1316 is greater than the thickness of the winding plate 1313 or the groove depth of the second clamping groove 1317 is greater than the thickness of the auxiliary member 1311 at the first clamping groove 1316, the winding plate 1313 cannot be stably matched and falls off from the inside of the auxiliary member 1311.

[0060] Further, the winding plate 1313 is fixed with the auxiliary member 1311 by an adhesive, i.e. the second clamping groove 1317 of the winding plate 1313 is fixedly connected in the first clamping groove 1316 of the auxiliary member 1311 by the adhesive, which can make the connection between the winding plate 1313 and the auxiliary member 1311 more stable. The adhesive is a two-component high-temperature-resistant epoxy adhesive, and of course it can also be other adhesive, but it needs to ensure that the adhesive can firmly bond the winding plate 1313 and the auxiliary member 1311, and the adhesive needs to be high-temperature-resistant to adapt to the high-temperature injection of the high-voltage insulation layer 1330 covering the winding plate 1313 and the auxiliary member 1311.

[0061] Further, each first auxiliary piece 13111 is provided with a plurality of grooves 1318 on the side surface of the end comb teeth of the winding plate 1313, the plurality of grooves 1318 are in one-to-one correspondence with the plurality of first clamping grooves 1316 and are also provided in correspondence with the plurality of winding plates 1313, for accommodating the comb teeth at the end of the winding plate 1313. The plurality of grooves 1318 are arranged radially along the first auxiliary piece 13111 and are uniformly distributed along the circumference of the first auxiliary piece 13111, the grooves 1318 penetrate the surface of the first auxiliary piece 13111, and the width of the grooves 1318 along the circumference of the first auxiliary piece 13111 matches the thickness of the winding plate 1313, and the depth of the grooves 1318 along the axial direction of the first auxiliary piece 13111 matches the tooth height of the comb teeth at the end of the winding plate 1313, so that when the second clamping groove 1317 at the end of the winding plate 1313 is fixedly connected in the first clamping groove 1316 of the first auxiliary piece 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 flush with the mutually distant surfaces of the two first auxiliary pieces 13111. Compared with the winding structure of the winding plate protruding from the surface of the auxiliary piece, the structure of the present application can effectively avoid the impact of the injection impact force generated when the high-temperature vulcanized silicone rubber is injected outside the winding body 1310 on the comb teeth at the end of the winding plate 1313, thereby causing the winding plate 1313 to deviate or even be damaged, affecting the quality of the high-voltage winding 130.

[0062] Further, the inner side of the first auxiliary piece 13111 is provided with a plurality of flow-through grooves 1319, so that during the injection molding process of the high-voltage insulation layer 1330, the injected silicone rubber raw material can flow from the end of the winding part 1312 to the inside of the winding part 1312, thereby making the high-voltage insulation layer 1330 fully fill the gap between the winding part 1312 and the high-voltage coil 1320 and the two ends of the winding part 1312. In this embodiment, four flow-through grooves 1319 are provided, which are symmetrically arranged on the inner side of the first auxiliary piece 1311, so that the flow of the injected silicone rubber raw material is more uniform, improving the injection quality. In other embodiments, the flow-through grooves can also be provided with one, two, three or more, or can be asymmetrically arranged, which is not limited here.

[0063] The width of the auxiliary member 1311 along the radial direction of the winding body 1310 is defined as the width of the auxiliary member 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 member 13111 mainly fixes the two ends of the winding plate 1313, and the second auxiliary member 13112 assists in fixing the middle part of the winding plate 1313, the width of the first auxiliary member 13111 is set to be greater than the width of the second auxiliary member 13112. In this way, the amount of material can be reduced while ensuring the stable assembly of the winding part 1312, thereby reducing the cost. The width of the first auxiliary member 13111 is approximately equal to the width of the winding plate 1313. On the one hand, this can ensure the stable assembly of the winding part 1312 and prevent the winding plate 1313 from being damaged due to a large injection pressure during the injection of the high-voltage insulation layer 1330. On the other hand, the first auxiliary member 13111 can also have a limiting effect on the coil wound in the winding groove 1314 at the end of the winding plate 1313, thereby avoiding displacement of the wire and affecting the quality of the high-voltage winding 130. The width of the second auxiliary member 13112 can be less than the width of the winding plate 1313, for example, one-half or one-third of the width of the winding plate 1313. In this way, the second auxiliary member 13112 can assist in fixing the winding plate 1313 without affecting the extraction of the tap from the middle part of the winding plate 1313.

[0064] At least one set of winding plates 1313 is also provided with a protrusion corresponding to the inner wall of the injection mold. In this way, when the winding body 1310 with the high-voltage coil 1320 is placed in the injection mold together with the winding tool, on the one hand, the protrusion of the injection mold can further support the winding part 1312, thereby preventing the winding plate 1313 from being loose and displaced, which can affect the quality of the high-voltage winding 130. On the other hand, the protrusion can leave a space between the winding part 1312 and the inner wall of the injection mold, thereby facilitating the flow of silicone rubber and uniformly wrapping the winding part 1312, and ensuring the injection quality of the high-voltage insulation layer 1330.

[0065] Further, all the winding plates 1313 provided with the protrusion are symmetrically distributed along the central axis of the winding body 1310. In this way, the displacement of the winding part 1312 due to uneven stress when the winding part 1312 is installed in the injection mold can be avoided, thereby affecting the injection quality of the high-voltage insulation layer 1330. The at least one set of winding plates 1313 can include two, four, six, or more winding plates 1313, and the number of winding plates 1313 provided with the protrusion is not limited.

[0066] In an application scenario, as shown in FIG. 8, the winding part 1312 is provided with a plurality of winding plates 1313, and the plurality of winding plates 1313 are arranged in a plurality of groups. Each group of winding plates 1313 is provided with a first auxiliary member 13111 and a second auxiliary member 13112. The first auxiliary member 13111 and the second auxiliary member 13112 are arranged on the two ends of the winding plate 1313, respectively. The first auxiliary member 13111 is arranged on the side of the winding plate 1313 away from the winding groove 1314, and the second auxiliary member 13112 is arranged on the side of the winding plate 1313 close to the winding groove 1314. Figure 9As shown, the two ends of at least one set of winding plates 1313 are provided with first protrusions 13131, which 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 part 13111. When the winding body 1310 with the high-voltage coil 1320 is placed into the injection mold together with the winding tool, the first protrusions 13131 on the winding plate 1313 can abut against the end inner wall of the injection mold, further supporting the winding part 1312, avoiding the loose displacement of the winding plate 1313 to affect the quality of the high-voltage winding 130, and at the same time leaving a space between the first auxiliary part 13111 and the end inner wall of the injection mold to facilitate the flow of silicone rubber, so that the high-voltage insulation layer 1330 can wrap the two ends of the winding part 1312. In this embodiment, the two ends of the eight winding plates 1313 symmetrically arranged on both sides of the winding part 1312 are provided with first protrusions 13131, which can ensure that the winding part 1312 is more uniformly stressed when installed in the injection mold, ensuring the supporting effect while reducing the amount of material and cost. It can be understood that the number and distribution position of the first protrusions 13131 can be adjusted according to the support requirements.

[0067] In another application scenario, at least two comb teeth of at least one set of winding plates 1313 are provided with second protrusions, which are arranged along the radial direction of the winding plate 1313. When the winding body 1310 with the high-voltage coil 1320 is placed into the injection mold together with the winding tool, the second protrusions 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 to affect the quality of the high-voltage winding 130, and at the same time leaving a 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] Further, on the same winding plate 1313, all the comb teeth provided with second protrusions are symmetrically distributed along the center line of the length direction of the winding plate 1313. In this embodiment, four comb teeth on the winding plate 1313 are provided with second protrusions, which are symmetrically arranged along the center cross section of the winding body 1310. All the winding plates 1313 are provided with second protrusions and the positions are correspondingly matched, which can ensure that the winding part 1312 is more uniformly 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, which are not limited here.

[0069] In this embodiment, the auxiliary part 1311 is also made of glass fiber impregnated with epoxy resin, which is formed by stacking multiple layers of glass fiber cloth impregnated with epoxy resin to a certain thickness and then molding and curing to form a glass steel part. The winding plate 1313 and the auxiliary part 1311 are separately formed and then fixed by clamping and bonding.

[0070] The winding body 1310 is made of the above-mentioned fiber-reinforced composite material, has the characteristics of light weight and high strength, 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 from scattering and displacing the wire; and the fiber-reinforced composite material has good heat resistance, avoiding deformation of the winding body 1310 due to excessive heat generated by the high-voltage coil 1320 during operation of the dry-type transformer 10.

[0071] In combination Figure 10 As shown in the drawings, in order to make the inner wall of the high-voltage winding 130 more smooth and smooth, and at the same time improve the insulation performance of the inner wall of the high-voltage winding 130, the winding body 1310 further includes an inner lining layer 1340, which is a hollow cylindrical structure, and a plurality of winding plates 1313 are uniformly distributed on the outer circumferential surface 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 support layer 1341 and a fusion layer 1342, which are closely arranged. 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 strengthen the support effect on the winding part 1312, and the fusion layer 1342 can be vulcanized with the silicone rubber raw material of the high-voltage insulating layer 1330 during injection molding, thereby playing its fusion role, improving the fusion effect between the winding part 1312 of the composite material and the high-voltage insulating layer 1330 of the silicone rubber, 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 more smooth and smooth.

[0073] Specifically, the vulcanized silicone rubber is defined as a cured rubber, and the unvulcanized silicone rubber is defined as a raw rubber. The support layer 1341 is a cured rubber sheet with a certain thickness, and the fusion layer 1342 is a raw rubber sheet with 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, the length of the inner wall of the winding part 1312 can be the same or slightly larger, which can 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-jointed to form a hollow cylindrical structure, thereby obtaining a flexible inner lining layer 1340.

[0074] When the winding body 1310 is assembled, first, the corresponding vulcanized sheet and the raw rubber sheet are overlapped and wound on the outer circumferential surface of the winding tool, and the two ends are butted and wound into a hollow cylindrical structure, that is, the inner liner 1340 is formed, then the winding plate 1313 is clamped and fixed with the auxiliary part 1311 to form the hollow winding part 1312, and finally the assembled winding part 1312 is sleeved on the outer circumferential surface of the inner liner 1340 to complete the assembly of the winding body 1310, and waits for subsequent wire winding.

[0075] In the embodiment, since the raw rubber sheet has not been vulcanized and formed, its surface is more easily scratched and damaged than the vulcanized sheet. Therefore, the support layer 1341 is arranged outside the inner liner 1340, and the fusion layer 1342 is arranged inside the inner liner 1340, that is, the plurality of winding plates 1313 are evenly distributed on the outer circumferential surface of the vulcanized sheet, and the raw rubber sheet is attached to the outer circumferential surface of the winding tool. On the one hand, when the winding part 1312 is sleeved on the outer circumferential surface of the inner liner 1340, the outer surface of the inner liner 1340 can be damaged due to assembly gap problems, and the support effect of the inner liner 1340 can be ensured. On the other hand, before the high-voltage insulation layer 1330 is completely 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 respectively located on both sides of the vulcanized sheet of the support layer 1341. When the raw rubber is vulcanized at high temperature, it can be fused with the surface of the vulcanized sheet to a certain extent, thereby ensuring the fusion effect of the inner liner 1340, improving the smoothness of the inner wall of the high-voltage winding 130, and improving the insulation performance. In other embodiments, the support layer can be arranged on the inner side and the fusion layer can be arranged on the outer side, as long as the winding part is assembled without damaging the surface of the inner liner. Therefore, the specific limitation is not made here.

[0076] Further, the inner liner 1340 further comprises an intermediate layer, the support layer 1341, the intermediate layer and the fusion layer 1342 are sequentially and closely arranged, and 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 improve the support effect of the winding part 1312. When the inner liner 1340 is prepared, the support layer 1341, the intermediate layer and the fusion layer 1342 are sequentially overlapped and wound to form a hollow cylindrical structure.

[0077] In combination with Figure 5 , Figure 6 , Figure 9 , Figure 12 and Figure 13As shown, taking the A-phase transformer 100 as an example, the conductive wire is wound circumferentially on the outer circumferential surface of the winding body 1310 to form the high-voltage coil 1320. Specifically, the conductive wire is wound in the winding groove 1314 of the winding part 1312, so that the high-voltage coil 1320 is distributed at intervals in the axial direction of the winding body 1310, and the conductive wire has two outer connections after winding, i.e., a first outer connection D and a second outer connection X, the first outer connection D is used for connecting a cable, and the second outer connection X is used for connecting other outer connections, such as in a three-phase transformer, for mutual connection between each phase transformer. The conductive wire is led out from the middle of the winding body 1310 along the axial direction of the winding body 1310 to form six tapping terminals, i.e., a tapping terminal 2, a tapping terminal 3, a tapping terminal 4, a tapping terminal 5, a tapping terminal 6, and a tapping terminal 7. The six tapping terminals form tapping switches. For ease of description, the tapping terminal 2, the tapping terminal 4, and the tapping terminal 6 are defined as a first tapping switch, and the tapping terminal 3, the tapping terminal 5, and the tapping terminal 7 are defined as a second tapping switch.

[0078] In an application scenario, the conductive wire includes a first conductive wire and a second conductive wire, both of which are continuous conductive wires, and both of which are coated with an insulating layer, which can be a polyimide film or a glass fiber film, or other insulating materials such as polyester paint, or a combination of multiple insulating materials, which is not limited here. For ease of description, the upper end of the winding part 1312 is defined as the first end when the high-voltage winding 130 is vertically placed, and the lower end of the winding part 1312 is defined as the second end. The first conductive wire is wound from the first end of the winding part 1312 to the middle of the winding part 1312 along the axial direction of the winding body 1310, and three tapping terminals are led out. The first conductive wire is wound from the first end of the winding part 1312 to the second end of the winding part 1312, and the first conductive wire is wound in the first winding groove 1314 corresponding to one turn on all winding plates 1313 to form a first coil 1321, which is a pie-type winding method, and only one pie coil is arranged in each winding groove 1314, so that each coil has only one pie coil at this time. The inner turn end of the first coil 1321 (i.e., the first end of the first conductive wire) is the first outer connection D, and the outer turn end of the first coil 1321 extends into the second winding groove 1314 corresponding to one turn on all winding plates 1313 to continue winding to form a second coil 1322, and so on, until the first conductive wire is wound to the middle of the winding body 1310 to form a plurality of coils, and the outer turn ends of three coils are led out to form three tapping terminals, i.e., the tapping terminal 6, the tapping terminal 4, and the tapping terminal 2 as shown, and the winding of the first conductive wire is completed. Figure 12

[0079] ​The second wire is wound from the middle of the winding part 1312 to the second end of the winding part 1312 along the axial direction of the winding body 1310, and leads out another three taps. Specifically, the second wire starts to be wound in the next winding groove 1314 adjacent to the tap 2, forming a third segment coil 1323, and the second wire continues to be wound to the second end of the winding part 1312 in the same manner as the first wire, and leads out another three taps, i.e., the tap 3, the tap 5 and the tap 7, from the three segment coils starting from the third segment coil 1323 during the winding process, until the second wire is wound to the corresponding last winding groove 1314 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 wire, is the second external X, and the winding of the second wire is completed.

[0080] During the winding of the wire, the wire is wound in the corresponding winding groove 1314 on all the winding plates 1313, so that each segment coil formed by the winding of the wire is perpendicular to the axial direction of the winding body 1310, the winding is convenient, the wire is arranged neatly, the winding plates 1313 are uniformly stressed, and the mechanical strength is good.

[0081] In this way, the pie-type high-voltage coil 1320 is formed, which has good mechanical strength and strong resistance to the electric power generated by the short-circuit current, has more pie numbers and better heat dissipation capacity compared with the layer-type coil. Moreover, in the axial direction of the winding body 1310, the first tap changer and the second tap changer are arranged in parallel, and the six taps form the tap device of the high-voltage coil 1320, which is used to adjust the voltage according to different operating conditions of the dry-type transformer 10. Of course, in other embodiments, a layer-type coil can also be used.

[0082] The wire is wound on the winding body 1310 to form the high-voltage coil 1320, and the high-voltage coil 1320 is annular. The width of the high-voltage coil 1320 is defined as the width of the high-voltage coil 1320, and the width of the high-voltage coil 1320 in each radial cross section is uniform, so that the high-voltage coil 1320 is balanced in overall stress. Of course, considering the actual operation, the width of each coil in its radial cross section can also not be exactly the same, as long as it is approximately the same.

[0083] In this embodiment, the tap changer includes six taps, and the dry-type transformer 10 has five positions to adjust the voltage. In other embodiments, the tap changer can include four taps, i.e., the first tap changer and the second tap changer each include two taps, and the dry-type transformer includes three positions to adjust the voltage, as long as it meets the actual use requirements of the dry-type transformer, which is not limited herein.

[0084] As shown in FIG. 6, the dry-type transformer 10 includes a winding body 1310, a first winding plate 1311 and a second winding plate 1312. The winding body 1310 is annular, and the first winding plate 1311 and the second winding plate 1312 are arranged on the winding body 1310 in the axial direction of the winding body 1310. The winding body 1310 is provided with a plurality of winding grooves 1314, and the first winding plate 1311 and the second winding plate 1312 are provided with a plurality of winding grooves 1314 corresponding to the winding grooves 1314 of the winding body 1310. Figure 9 , Figure 11As shown, the high-voltage insulating layer 1330 wraps the high-voltage coil 1320 and the winding body 1310 to form the high-voltage winding 130. The high-voltage insulating layer 1330 is high-temperature vulcanized silicone rubber. The wire is 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 an injection body. The injection body is placed in an injection mold. By adding silicone rubber raw materials, the high-temperature vulcanized silicone rubber is injected around the injection body to obtain the high-voltage winding 130. The high-voltage insulating 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] In the high-temperature vulcanized silicone rubber of the present application, the high-temperature vulcanized silicone rubber material system specifically includes raw rubber, reinforcing agent, flame retardant, heat-resistant agent, and other auxiliary materials.

[0086] After the high-temperature vulcanized silicone rubber is injected as a whole to wrap the high-voltage coil 1320 and the winding body 1310, 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 as a whole has a hollow columnar shape, which can be a hollow cylindrical body, a hollow elliptical cylindrical body, or other hollow columnar bodies.

[0087] Before the high-temperature vulcanized silicone rubber is injected as a whole, a tool connecting piece can be arranged on the injection mold. The tool connecting piece is provided with six protection cavities corresponding to the six taps. The taps are fixed in the protection cavities, and the remaining space in the protection cavities is filled by bolts and other connecting pieces, so that the six taps cannot be covered by silicone rubber during the injection process and cannot be used for wiring.

[0088] The high-voltage winding 130 of the present application is provided with a high-voltage insulation layer 1330 of high-temperature vulcanized silicone rubber outside the high-voltage coil 1320, which has the following advantages compared with the high-voltage insulation layer of epoxy resin in the prior art: 1) good fireproof performance, low-temperature resistance, aging resistance and short-circuit resistance, which can effectively prolong the service life of the dry-type transformer 10; 2) the copper coil is easy to peel off from the silicone rubber, and the material recovery rate is greater than 99%, which is more green and environmentally friendly; 3) the silicone rubber elastomer can weaken the partial discharge induced by mechanical vibration, has an inhibitory effect on equipment discharge, and the product of the silicone rubber under the action of discharge is non-conductive silicon dioxide, which can effectively inhibit the continuous deterioration of the insulation; 4) can reduce the operating loss of the transformer, and is more energy-saving; 5) has good resistance to harsh environments and can be installed indoors and outdoors. At the same time, the present application is formed by overall high-temperature vulcanization injection molding, which is more stable than the existing room temperature vulcanization, has higher mechanical properties, and has better adhesion to the high-voltage coil 1320 and the winding body 1310, which can effectively prolong the service life of the high-voltage insulation layer 1330. And compared with liquid silicone rubber, the high-temperature vulcanized silicone rubber of the present application has uniform filler dispersion, and will not cause partial discharge of the dry-type transformer 10 due to filler agglomeration, so that the overall performance of the dry-type transformer 10 is better.

[0089] In the present embodiment, as shown in Figure 13 Fig. 6 is a partial sectional view of the high-voltage winding 130 with the high-voltage insulation layer 1330 along the axial direction thereof, the conductive wire is wound in the comb-shaped winding plate 1313 by the above-mentioned winding method to form the pie-type high-voltage coil 1320, and the pie-type high-voltage coil 1320 is arranged at intervals with the combs of the winding plate 1313 along the axial direction of the high-voltage winding 130, that is, a pie coil is arranged between adjacent two combs. In other embodiments, the conductive wire can also form a high-voltage coil by other winding methods, as long as the structure of the winding part is adjusted correspondingly, for example, when the width of the winding groove on the winding plate is increased according to the winding requirement, the width of the corresponding support part can be increased, or the number of the corresponding support parts can be increased to ensure the support effect, which is not limited specifically herein.

[0090] The technical content and technical features of the present application have been disclosed above, however, it can be understood that under the creative idea of the present application, those skilled in the art can make various changes and improvements to the above-mentioned structure and material, including the combination of the technical features disclosed or claimed herein, and obviously including other combinations of these features. These modifications and / or combinations all fall within the technical field to which the present application relates, 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 inner lining layer is a flexible hollow cylindrical structure, the size of the inner lining layer matches the inner wall of the high-voltage winding, the inner lining layer comprises a support layer and a fusion layer, the support layer and the fusion layer are closely arranged, the support layer is made of vulcanized silicone rubber, and the fusion layer is made of unvulcanized silicone rubber.

2. The winding body of a high voltage winding as claimed in claim 1, characterized in that The support layer is located outside the fusion layer.

3. The winding body of the high voltage winding according to claim 1, characterized in that, The sheet-shaped support layer and the sheet-shaped fusion layer are overlapped and butt-jointed to form the hollow cylindrical structure.

4. The winding body of the high voltage winding according to claim 1, characterized in that, The inner lining layer further comprises an intermediate layer, the support layer, the intermediate layer and the fusion layer are sequentially and closely arranged.

5. The winding body of a high voltage winding as claimed in claim 4, characterized in that The intermediate layer is made of glass fiber mesh or aramid fiber mesh.

6. The winding body of a high voltage winding as claimed in claim 1, characterized in that The winding body further comprises a plurality of winding plates, the length direction of the plurality of winding plates is arranged along the axial direction of the winding body, and the plurality of winding plates are uniformly distributed on the outer circumferential surface of the inner lining layer in the circumferential direction.

7. The winding body of a high voltage winding as claimed in claim 6, characterized in that The winding body further comprises a plurality of auxiliary members, the plurality of auxiliary members are annular and arranged in the axial direction of the winding body at intervals, the auxiliary members are connected with the winding plates in a clamping mode, and the winding plates are arranged in the inner circumferences of the auxiliary members.

8. A high voltage winding, characterized by The winding body comprises the high-voltage winding as claimed in any one of claims 1 to 7, a high-voltage coil is formed by winding a wire on the winding body, and the high-voltage coil is coated with a high-voltage insulation layer.

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